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746f956beb
linux-next/fs/xfs/xfs_bmap.c
Nathan Scott 3762ec6bf7 [XFS] Merge in trivial changes, sync up headers with userspace 
equivalents.

SGI-PV: 907752
SGI-Modid: xfs-linux-melb:xfs-kern:24961a

Signed-off-by: Nathan Scott <nathans@sgi.com>
2006-01-12 10:29:53 +11:00

6432 lines
194 KiB
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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_inode_item.h"
#include "xfs_extfree_item.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_dir_leaf.h"
#include "xfs_attr_leaf.h"
#include "xfs_rw.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
#ifdef DEBUG
STATIC void
xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
#endif
kmem_zone_t *xfs_bmap_free_item_zone;
/*
* Prototypes for internal bmap routines.
*/
/*
* Called from xfs_bmap_add_attrfork to handle extents format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags); /* inode logging flags */
/*
* Called from xfs_bmap_add_attrfork to handle local format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_local(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags); /* inode logging flags */
/*
* Called by xfs_bmapi to update extent list structure and the btree
* after allocating space (or doing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_add_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
int whichfork, /* data or attr fork */
int rsvd); /* OK to allocate reserved blocks */
/*
* Called by xfs_bmap_add_extent to handle cases converting a delayed
* allocation to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_delay_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
int rsvd); /* OK to allocate reserved blocks */
/*
* Called by xfs_bmap_add_extent to handle cases converting a hole
* to a delayed allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_delay(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
int *logflagsp,/* inode logging flags */
int rsvd); /* OK to allocate reserved blocks */
/*
* Called by xfs_bmap_add_extent to handle cases converting a hole
* to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
int *logflagsp, /* inode logging flags */
int whichfork); /* data or attr fork */
/*
* Called by xfs_bmap_add_extent to handle cases converting an unwritten
* allocation to a real allocation or vice versa.
*/
STATIC int /* error */
xfs_bmap_add_extent_unwritten_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
int *logflagsp); /* inode logging flags */
/*
* xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
* It figures out where to ask the underlying allocator to put the new extent.
*/
STATIC int /* error */
xfs_bmap_alloc(
xfs_bmalloca_t *ap); /* bmap alloc argument struct */
/*
* Transform a btree format file with only one leaf node, where the
* extents list will fit in the inode, into an extents format file.
* Since the extent list is already in-core, all we have to do is
* give up the space for the btree root and pitch the leaf block.
*/
STATIC int /* error */
xfs_bmap_btree_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_btree_cur_t *cur, /* btree cursor */
int *logflagsp, /* inode logging flags */
int whichfork); /* data or attr fork */
#ifdef DEBUG
/*
* Check that the extents list for the inode ip is in the right order.
*/
STATIC void
xfs_bmap_check_extents(
xfs_inode_t *ip, /* incore inode pointer */
int whichfork); /* data or attr fork */
#endif
/*
* Called by xfs_bmapi to update extent list structure and the btree
* after removing space (or undoing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_del_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_trans_t *tp, /* current trans pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_bmap_free_t *flist, /* list of extents to be freed */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
int *logflagsp,/* inode logging flags */
int whichfork, /* data or attr fork */
int rsvd); /* OK to allocate reserved blocks */
/*
* Remove the entry "free" from the free item list. Prev points to the
* previous entry, unless "free" is the head of the list.
*/
STATIC void
xfs_bmap_del_free(
xfs_bmap_free_t *flist, /* free item list header */
xfs_bmap_free_item_t *prev, /* previous item on list, if any */
xfs_bmap_free_item_t *free); /* list item to be freed */
/*
* Remove count entries from the extents array for inode "ip", starting
* at index "idx". Copies the remaining items down over the deleted ones,
* and gives back the excess memory.
*/
STATIC void
xfs_bmap_delete_exlist(
xfs_inode_t *ip, /* incode inode pointer */
xfs_extnum_t idx, /* starting delete index */
xfs_extnum_t count, /* count of items to delete */
int whichfork); /* data or attr fork */
/*
* Convert an extents-format file into a btree-format file.
* The new file will have a root block (in the inode) and a single child block.
*/
STATIC int /* error */
xfs_bmap_extents_to_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first-block-allocated */
xfs_bmap_free_t *flist, /* blocks freed in xaction */
xfs_btree_cur_t **curp, /* cursor returned to caller */
int wasdel, /* converting a delayed alloc */
int *logflagsp, /* inode logging flags */
int whichfork); /* data or attr fork */
/*
* Insert new item(s) in the extent list for inode "ip".
* Count new items are inserted at offset idx.
*/
STATIC void
xfs_bmap_insert_exlist(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* starting index of new items */
xfs_extnum_t count, /* number of inserted items */
xfs_bmbt_irec_t *new, /* items to insert */
int whichfork); /* data or attr fork */
/*
* Convert a local file to an extents file.
* This code is sort of bogus, since the file data needs to get
* logged so it won't be lost. The bmap-level manipulations are ok, though.
*/
STATIC int /* error */
xfs_bmap_local_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated in xaction */
xfs_extlen_t total, /* total blocks needed by transaction */
int *logflagsp, /* inode logging flags */
int whichfork); /* data or attr fork */
/*
* Search the extents list for the inode, for the extent containing bno.
* If bno lies in a hole, point to the next entry. If bno lies past eof,
* *eofp will be set, and *prevp will contain the last entry (null if none).
* Else, *lastxp will be set to the index of the found
* entry; *gotp will contain the entry.
*/
STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
xfs_bmap_search_extents(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t bno, /* block number searched for */
int whichfork, /* data or attr fork */
int *eofp, /* out: end of file found */
xfs_extnum_t *lastxp, /* out: last extent index */
xfs_bmbt_irec_t *gotp, /* out: extent entry found */
xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
/*
* Check the last inode extent to determine whether this allocation will result
* in blocks being allocated at the end of the file. When we allocate new data
* blocks at the end of the file which do not start at the previous data block,
* we will try to align the new blocks at stripe unit boundaries.
*/
STATIC int /* error */
xfs_bmap_isaeof(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t off, /* file offset in fsblocks */
int whichfork, /* data or attribute fork */
char *aeof); /* return value */
#ifdef XFS_BMAP_TRACE
/*
* Add a bmap trace buffer entry. Base routine for the others.
*/
STATIC void
xfs_bmap_trace_addentry(
int opcode, /* operation */
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(ies) */
xfs_extnum_t cnt, /* count of entries, 1 or 2 */
xfs_bmbt_rec_t *r1, /* first record */
xfs_bmbt_rec_t *r2, /* second record or null */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
*/
STATIC void
xfs_bmap_trace_delete(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(entries) deleted */
xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
* reading in the extents list from the disk (in the btree).
*/
STATIC void
xfs_bmap_trace_insert(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(entries) inserted */
xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
xfs_bmbt_irec_t *r1, /* inserted record 1 */
xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry after updating an extent list entry in place.
*/
STATIC void
xfs_bmap_trace_post_update(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry updated */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry prior to updating an extent list entry in place.
*/
STATIC void
xfs_bmap_trace_pre_update(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry to be updated */
int whichfork); /* data or attr fork */
#else
#define xfs_bmap_trace_delete(f,d,ip,i,c,w)
#define xfs_bmap_trace_insert(f,d,ip,i,c,r1,r2,w)
#define xfs_bmap_trace_post_update(f,d,ip,i,w)
#define xfs_bmap_trace_pre_update(f,d,ip,i,w)
#endif /* XFS_BMAP_TRACE */
/*
* Compute the worst-case number of indirect blocks that will be used
* for ip's delayed extent of length "len".
*/
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
xfs_inode_t *ip, /* incore inode pointer */
xfs_filblks_t len); /* delayed extent length */
#ifdef DEBUG
/*
* Perform various validation checks on the values being returned
* from xfs_bmapi().
*/
STATIC void
xfs_bmap_validate_ret(
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
xfs_bmbt_irec_t *mval,
int nmap,
int ret_nmap);
#else
#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
#endif /* DEBUG */
#if defined(XFS_RW_TRACE)
STATIC void
xfs_bunmap_trace(
xfs_inode_t *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
inst_t *ra);
#else
#define xfs_bunmap_trace(ip, bno, len, flags, ra)
#endif /* XFS_RW_TRACE */
STATIC int
xfs_bmap_count_tree(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_fsblock_t blockno,
int levelin,
int *count);
STATIC int
xfs_bmap_count_leaves(
xfs_bmbt_rec_t *frp,
int numrecs,
int *count);
STATIC int
xfs_bmap_disk_count_leaves(
xfs_bmbt_rec_t *frp,
int numrecs,
int *count);
/*
* Bmap internal routines.
*/
/*
* Called from xfs_bmap_add_attrfork to handle btree format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* btree cursor */
int error; /* error return value */
xfs_mount_t *mp; /* file system mount struct */
int stat; /* newroot status */
mp = ip->i_mount;
if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
*flags |= XFS_ILOG_DBROOT;
else {
cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
XFS_DATA_FORK);
cur->bc_private.b.flist = flist;
cur->bc_private.b.firstblock = *firstblock;
if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
goto error0;
ASSERT(stat == 1); /* must be at least one entry */
if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
goto error0;
if (stat == 0) {
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
return XFS_ERROR(ENOSPC);
}
*firstblock = cur->bc_private.b.firstblock;
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
}
return 0;
error0:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle extents format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* bmap btree cursor */
int error; /* error return value */
if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
return 0;
cur = NULL;
error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
flags, XFS_DATA_FORK);
if (cur) {
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle local format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_local(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_da_args_t dargs; /* args for dir/attr code */
int error; /* error return value */
xfs_mount_t *mp; /* mount structure pointer */
if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
return 0;
if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
mp = ip->i_mount;
memset(&dargs, 0, sizeof(dargs));
dargs.dp = ip;
dargs.firstblock = firstblock;
dargs.flist = flist;
dargs.total = mp->m_dirblkfsbs;
dargs.whichfork = XFS_DATA_FORK;
dargs.trans = tp;
error = XFS_DIR_SHORTFORM_TO_SINGLE(mp, &dargs);
} else
error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
XFS_DATA_FORK);
return error;
}
/*
* Called by xfs_bmapi to update extent list structure and the btree
* after allocating space (or doing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_add_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
int whichfork, /* data or attr fork */
int rsvd) /* OK to use reserved data blocks */
{
xfs_btree_cur_t *cur; /* btree cursor or null */
xfs_filblks_t da_new; /* new count del alloc blocks used */
xfs_filblks_t da_old; /* old count del alloc blocks used */
int error; /* error return value */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_add_extent";
#endif
xfs_ifork_t *ifp; /* inode fork ptr */
int logflags; /* returned value */
xfs_extnum_t nextents; /* number of extents in file now */
XFS_STATS_INC(xs_add_exlist);
cur = *curp;
ifp = XFS_IFORK_PTR(ip, whichfork);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(idx <= nextents);
da_old = da_new = 0;
error = 0;
/*
* This is the first extent added to a new/empty file.
* Special case this one, so other routines get to assume there are
* already extents in the list.
*/
if (nextents == 0) {
xfs_bmap_trace_insert(fname, "insert empty", ip, 0, 1, new,
NULL, whichfork);
xfs_bmap_insert_exlist(ip, 0, 1, new, whichfork);
ASSERT(cur == NULL);
ifp->if_lastex = 0;
if (!ISNULLSTARTBLOCK(new->br_startblock)) {
XFS_IFORK_NEXT_SET(ip, whichfork, 1);
logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
} else
logflags = 0;
}
/*
* Any kind of new delayed allocation goes here.
*/
else if (ISNULLSTARTBLOCK(new->br_startblock)) {
if (cur)
ASSERT((cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL) == 0);
if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, cur, new,
&logflags, rsvd)))
goto done;
}
/*
* Real allocation off the end of the file.
*/
else if (idx == nextents) {
if (cur)
ASSERT((cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL) == 0);
if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
&logflags, whichfork)))
goto done;
} else {
xfs_bmbt_irec_t prev; /* old extent at offset idx */
/*
* Get the record referred to by idx.
*/
xfs_bmbt_get_all(&ifp->if_u1.if_extents[idx], &prev);
/*
* If it's a real allocation record, and the new allocation ends
* after the start of the referred to record, then we're filling
* in a delayed or unwritten allocation with a real one, or
* converting real back to unwritten.
*/
if (!ISNULLSTARTBLOCK(new->br_startblock) &&
new->br_startoff + new->br_blockcount > prev.br_startoff) {
if (prev.br_state != XFS_EXT_UNWRITTEN &&
ISNULLSTARTBLOCK(prev.br_startblock)) {
da_old = STARTBLOCKVAL(prev.br_startblock);
if (cur)
ASSERT(cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL);
if ((error = xfs_bmap_add_extent_delay_real(ip,
idx, &cur, new, &da_new, first, flist,
&logflags, rsvd)))
goto done;
} else if (new->br_state == XFS_EXT_NORM) {
ASSERT(new->br_state == XFS_EXT_NORM);
if ((error = xfs_bmap_add_extent_unwritten_real(
ip, idx, &cur, new, &logflags)))
goto done;
} else {
ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
if ((error = xfs_bmap_add_extent_unwritten_real(
ip, idx, &cur, new, &logflags)))
goto done;
}
ASSERT(*curp == cur || *curp == NULL);
}
/*
* Otherwise we're filling in a hole with an allocation.
*/
else {
if (cur)
ASSERT((cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL) == 0);
if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
new, &logflags, whichfork)))
goto done;
}
}
ASSERT(*curp == cur || *curp == NULL);
/*
* Convert to a btree if necessary.
*/
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
flist, &cur, da_old > 0, &tmp_logflags, whichfork);
logflags |= tmp_logflags;
if (error)
goto done;
}
/*
* Adjust for changes in reserved delayed indirect blocks.
* Nothing to do for disk quotas here.
*/
if (da_old || da_new) {
xfs_filblks_t nblks;
nblks = da_new;
if (cur)
nblks += cur->bc_private.b.allocated;
ASSERT(nblks <= da_old);
if (nblks < da_old)
xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
(int)(da_old - nblks), rsvd);
}
/*
* Clear out the allocated field, done with it now in any case.
*/
if (cur) {
cur->bc_private.b.allocated = 0;
*curp = cur;
}
done:
#ifdef DEBUG
if (!error)
xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
#endif
*logflagsp = logflags;
return error;
}
/*
* Called by xfs_bmap_add_extent to handle cases converting a delayed
* allocation to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_delay_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
int rsvd) /* OK to use reserved data block allocation */
{
xfs_bmbt_rec_t *base; /* base of extent entry list */
xfs_btree_cur_t *cur; /* btree cursor */
int diff; /* temp value */
xfs_bmbt_rec_t *ep; /* extent entry for idx */
int error; /* error return value */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_add_extent_delay_real";
#endif
int i; /* temp state */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = 0;/* state bits, accessed thru macros */
xfs_filblks_t temp; /* value for dnew calculations */
xfs_filblks_t temp2; /* value for dnew calculations */
int tmp_rval; /* partial logging flags */
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_FILLING, RIGHT_FILLING,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE \
(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
/*
* Set up a bunch of variables to make the tests simpler.
*/
cur = *curp;
base = ip->i_df.if_u1.if_extents;
ep = &base[idx];
xfs_bmbt_get_all(ep, &PREV);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous delayed allocation
* extent is being replaced by a real allocation.
*/
STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
STATE_SET(RIGHT_FILLING,
PREV.br_startoff + PREV.br_blockcount == new_endoff);
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
xfs_bmbt_get_all(ep - 1, &LEFT);
STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
}
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
xfs_bmbt_get_all(ep + 1, &RIGHT);
STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
}
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount ==
RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN));
error = 0;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (SWITCH_STATE) {
case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
/*
* Filling in all of a previously delayed allocation extent.
* The left and right neighbors are both contiguous with new.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1,
LEFT.br_blockcount + PREV.br_blockcount +
RIGHT.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
XFS_DATA_FORK);
xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
ip->i_d.di_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_delete(cur, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
PREV.br_blockcount +
RIGHT.br_blockcount, LEFT.br_state)))
goto done;
}
*dnew = 0;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
/*
* Filling in all of a previously delayed allocation extent.
* The left neighbor is contiguous, the right is not.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1,
LEFT.br_blockcount + PREV.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
XFS_DATA_FORK);
xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
LEFT.br_startblock, LEFT.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
PREV.br_blockcount, LEFT.br_state)))
goto done;
}
*dnew = 0;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
/*
* Filling in all of a previously delayed allocation extent.
* The right neighbor is contiguous, the left is not.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_startblock(ep, new->br_startblock);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount + RIGHT.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
XFS_DATA_FORK);
xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
new->br_startblock,
PREV.br_blockcount +
RIGHT.br_blockcount, PREV.br_state)))
goto done;
}
*dnew = 0;
break;
case MASK2(LEFT_FILLING, RIGHT_FILLING):
/*
* Filling in all of a previously delayed allocation extent.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_startblock(ep, new->br_startblock);
xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
ASSERT(i == 0);
cur->bc_rec.b.br_state = XFS_EXT_NORM;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
*dnew = 0;
break;
case MASK2(LEFT_FILLING, LEFT_CONTIG):
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is contiguous.
*/
xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1,
LEFT.br_blockcount + new->br_blockcount);
xfs_bmbt_set_startoff(ep,
PREV.br_startoff + new->br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
XFS_DATA_FORK);
temp = PREV.br_blockcount - new->br_blockcount;
xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep, temp);
ip->i_df.if_lastex = idx - 1;
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
LEFT.br_startblock, LEFT.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
new->br_blockcount,
LEFT.br_state)))
goto done;
}
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
STARTBLOCKVAL(PREV.br_startblock));
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
XFS_DATA_FORK);
*dnew = temp;
break;
case MASK(LEFT_FILLING):
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is not contiguous.
*/
xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
xfs_bmbt_set_startoff(ep, new_endoff);
temp = PREV.br_blockcount - new->br_blockcount;
xfs_bmbt_set_blockcount(ep, temp);
xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
XFS_DATA_FORK);
xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
ASSERT(i == 0);
cur->bc_rec.b.br_state = XFS_EXT_NORM;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_nextents > ip->i_df.if_ext_max) {
error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
first, flist, &cur, 1, &tmp_rval,
XFS_DATA_FORK);
rval |= tmp_rval;
if (error)
goto done;
}
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
STARTBLOCKVAL(PREV.br_startblock) -
(cur ? cur->bc_private.b.allocated : 0));
base = ip->i_df.if_u1.if_extents;
ep = &base[idx + 1];
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
xfs_bmap_trace_post_update(fname, "LF", ip, idx + 1,
XFS_DATA_FORK);
*dnew = temp;
break;
case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is contiguous with the new allocation.
*/
temp = PREV.br_blockcount - new->br_blockcount;
xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
XFS_DATA_FORK);
xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep, temp);
xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount,
RIGHT.br_state);
xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx + 1;
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock,
new->br_blockcount +
RIGHT.br_blockcount,
RIGHT.br_state)))
goto done;
}
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
STARTBLOCKVAL(PREV.br_startblock));
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
XFS_DATA_FORK);
*dnew = temp;
break;
case MASK(RIGHT_FILLING):
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is not contiguous.
*/
temp = PREV.br_blockcount - new->br_blockcount;
xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep, temp);
xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
new, NULL, XFS_DATA_FORK);
xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
ip->i_df.if_lastex = idx + 1;
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
ASSERT(i == 0);
cur->bc_rec.b.br_state = XFS_EXT_NORM;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_nextents > ip->i_df.if_ext_max) {
error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
first, flist, &cur, 1, &tmp_rval,
XFS_DATA_FORK);
rval |= tmp_rval;
if (error)
goto done;
}
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
STARTBLOCKVAL(PREV.br_startblock) -
(cur ? cur->bc_private.b.allocated : 0));
base = ip->i_df.if_u1.if_extents;
ep = &base[idx];
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
*dnew = temp;
break;
case 0:
/*
* Filling in the middle part of a previous delayed allocation.
* Contiguity is impossible here.
* This case is avoided almost all the time.
*/
temp = new->br_startoff - PREV.br_startoff;
xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep, temp);
r[0] = *new;
r[1].br_startoff = new_endoff;
temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
r[1].br_blockcount = temp2;
xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
XFS_DATA_FORK);
xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
ip->i_df.if_lastex = idx + 1;
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
ASSERT(i == 0);
cur->bc_rec.b.br_state = XFS_EXT_NORM;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_nextents > ip->i_df.if_ext_max) {
error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
first, flist, &cur, 1, &tmp_rval,
XFS_DATA_FORK);
rval |= tmp_rval;
if (error)
goto done;
}
temp = xfs_bmap_worst_indlen(ip, temp);
temp2 = xfs_bmap_worst_indlen(ip, temp2);
diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
(cur ? cur->bc_private.b.allocated : 0));
if (diff > 0 &&
xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -diff, rsvd)) {
/*
* Ick gross gag me with a spoon.
*/
ASSERT(0); /* want to see if this ever happens! */
while (diff > 0) {
if (temp) {
temp--;
diff--;
if (!diff ||
!xfs_mod_incore_sb(ip->i_mount,
XFS_SBS_FDBLOCKS, -diff, rsvd))
break;
}
if (temp2) {
temp2--;
diff--;
if (!diff ||
!xfs_mod_incore_sb(ip->i_mount,
XFS_SBS_FDBLOCKS, -diff, rsvd))
break;
}
}
}
base = ip->i_df.if_u1.if_extents;
ep = &base[idx];
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
xfs_bmap_trace_pre_update(fname, "0", ip, idx + 2,
XFS_DATA_FORK);
xfs_bmbt_set_startblock(ep + 2, NULLSTARTBLOCK((int)temp2));
xfs_bmap_trace_post_update(fname, "0", ip, idx + 2,
XFS_DATA_FORK);
*dnew = temp + temp2;
break;
case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK2(LEFT_FILLING, RIGHT_CONTIG):
case MASK2(RIGHT_FILLING, LEFT_CONTIG):
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
case MASK(LEFT_CONTIG):
case MASK(RIGHT_CONTIG):
/*
* These cases are all impossible.
*/
ASSERT(0);
}
*curp = cur;
done:
*logflagsp = rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
#undef MASK
#undef MASK2
#undef MASK3
#undef MASK4
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
}
/*
* Called by xfs_bmap_add_extent to handle cases converting an unwritten
* allocation to a real allocation or vice versa.
*/
STATIC int /* error */
xfs_bmap_add_extent_unwritten_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
int *logflagsp) /* inode logging flags */
{
xfs_bmbt_rec_t *base; /* base of extent entry list */
xfs_btree_cur_t *cur; /* btree cursor */
xfs_bmbt_rec_t *ep; /* extent entry for idx */
int error; /* error return value */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_add_extent_unwritten_real";
#endif
int i; /* temp state */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_exntst_t newext; /* new extent state */
xfs_exntst_t oldext; /* old extent state */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = 0;/* state bits, accessed thru macros */
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_FILLING, RIGHT_FILLING,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE \
(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
/*
* Set up a bunch of variables to make the tests simpler.
*/
error = 0;
cur = *curp;
base = ip->i_df.if_u1.if_extents;
ep = &base[idx];
xfs_bmbt_get_all(ep, &PREV);
newext = new->br_state;
oldext = (newext == XFS_EXT_UNWRITTEN) ?
XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
ASSERT(PREV.br_state == oldext);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous oldext allocation
* extent is being replaced by a newext allocation.
*/
STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
STATE_SET(RIGHT_FILLING,
PREV.br_startoff + PREV.br_blockcount == new_endoff);
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
xfs_bmbt_get_all(ep - 1, &LEFT);
STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
}
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == newext &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
xfs_bmbt_get_all(ep + 1, &RIGHT);
STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
}
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount ==
RIGHT.br_startblock &&
newext == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN));
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (SWITCH_STATE) {
case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
/*
* Setting all of a previous oldext extent to newext.
* The left and right neighbors are both contiguous with new.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1,
LEFT.br_blockcount + PREV.br_blockcount +
RIGHT.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
XFS_DATA_FORK);
xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
ip->i_d.di_nextents -= 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_delete(cur, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_delete(cur, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount + PREV.br_blockcount +
RIGHT.br_blockcount, LEFT.br_state)))
goto done;
}
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
/*
* Setting all of a previous oldext extent to newext.
* The left neighbor is contiguous, the right is not.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1,
LEFT.br_blockcount + PREV.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
XFS_DATA_FORK);
xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
ip->i_d.di_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_delete(cur, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount + PREV.br_blockcount,
LEFT.br_state)))
goto done;
}
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
/*
* Setting all of a previous oldext extent to newext.
* The right neighbor is contiguous, the left is not.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount + RIGHT.br_blockcount);
xfs_bmbt_set_state(ep, newext);
xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
XFS_DATA_FORK);
xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
ip->i_d.di_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_delete(cur, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount,
newext)))
goto done;
}
break;
case MASK2(LEFT_FILLING, RIGHT_FILLING):
/*
* Setting all of a previous oldext extent to newext.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_state(ep, newext);
xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
newext)))
goto done;
}
break;
case MASK2(LEFT_FILLING, LEFT_CONTIG):
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is contiguous.
*/
xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1,
LEFT.br_blockcount + new->br_blockcount);
xfs_bmbt_set_startoff(ep,
PREV.br_startoff + new->br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_startblock(ep,
new->br_startblock + new->br_blockcount);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur,
PREV.br_startoff + new->br_blockcount,
PREV.br_startblock + new->br_blockcount,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
goto done;
if (xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount + new->br_blockcount,
LEFT.br_state))
goto done;
}
break;
case MASK(LEFT_FILLING):
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is not contiguous.
*/
xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
xfs_bmbt_set_startoff(ep, new_endoff);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
xfs_bmbt_set_startblock(ep,
new->br_startblock + new->br_blockcount);
xfs_bmap_trace_post_update(fname, "LF", ip, idx, XFS_DATA_FORK);
xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
XFS_DATA_FORK);
xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur,
PREV.br_startoff + new->br_blockcount,
PREV.br_startblock + new->br_blockcount,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
cur->bc_rec.b = *new;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
break;
case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is contiguous with the new allocation.
*/
xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
XFS_DATA_FORK);
xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount, newext);
xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx + 1;
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock,
PREV.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
PREV.br_startblock,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
if ((error = xfs_bmbt_increment(cur, 0, &i)))
goto done;
if ((error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount,
newext)))
goto done;
}
break;
case MASK(RIGHT_FILLING):
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is not contiguous.
*/
xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
new, NULL, XFS_DATA_FORK);
xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
ip->i_df.if_lastex = idx + 1;
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
PREV.br_startblock,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
ASSERT(i == 0);
cur->bc_rec.b.br_state = XFS_EXT_NORM;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
break;
case 0:
/*
* Setting the middle part of a previous oldext extent to
* newext. Contiguity is impossible here.
* One extent becomes three extents.
*/
xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep,
new->br_startoff - PREV.br_startoff);
xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
r[0] = *new;
r[1].br_startoff = new_endoff;
r[1].br_blockcount =
PREV.br_startoff + PREV.br_blockcount - new_endoff;
r[1].br_startblock = new->br_startblock + new->br_blockcount;
r[1].br_state = oldext;
xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
XFS_DATA_FORK);
xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
ip->i_df.if_lastex = idx + 1;
ip->i_d.di_nextents += 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
/* new right extent - oldext */
if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
r[1].br_startblock, r[1].br_blockcount,
r[1].br_state)))
goto done;
/* new left extent - oldext */
PREV.br_blockcount =
new->br_startoff - PREV.br_startoff;
cur->bc_rec.b = PREV;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_increment(cur, 0, &i)))
goto done;
ASSERT(i == 1);
/* new middle extent - newext */
cur->bc_rec.b = *new;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
break;
case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK2(LEFT_FILLING, RIGHT_CONTIG):
case MASK2(RIGHT_FILLING, LEFT_CONTIG):
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
case MASK(LEFT_CONTIG):
case MASK(RIGHT_CONTIG):
/*
* These cases are all impossible.
*/
ASSERT(0);
}
*curp = cur;
done:
*logflagsp = rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
#undef MASK
#undef MASK2
#undef MASK3
#undef MASK4
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
}
/*
* Called by xfs_bmap_add_extent to handle cases converting a hole
* to a delayed allocation.
*/
/*ARGSUSED*/
STATIC int /* error */
xfs_bmap_add_extent_hole_delay(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
int *logflagsp, /* inode logging flags */
int rsvd) /* OK to allocate reserved blocks */
{
xfs_bmbt_rec_t *base; /* base of extent entry list */
xfs_bmbt_rec_t *ep; /* extent list entry for idx */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_add_extent_hole_delay";
#endif
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_filblks_t newlen=0; /* new indirect size */
xfs_filblks_t oldlen=0; /* old indirect size */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int state; /* state bits, accessed thru macros */
xfs_filblks_t temp; /* temp for indirect calculations */
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
base = ip->i_df.if_u1.if_extents;
ep = &base[idx];
state = 0;
ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
/*
* Check and set flags if this segment has a left neighbor
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
xfs_bmbt_get_all(ep - 1, &left);
STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
}
/*
* Check and set flags if the current (right) segment exists.
* If it doesn't exist, we're converting the hole at end-of-file.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
xfs_bmbt_get_all(ep, &right);
STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
}
/*
* Set contiguity flags on the left and right neighbors.
* Don't let extents get too large, even if the pieces are contiguous.
*/
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!STATE_TEST(LEFT_CONTIG) ||
(left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN)));
/*
* Switch out based on the contiguity flags.
*/
switch (SWITCH_STATE) {
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
/*
* New allocation is contiguous with delayed allocations
* on the left and on the right.
* Merge all three into a single extent list entry.
*/
temp = left.br_blockcount + new->br_blockcount +
right.br_blockcount;
xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1, temp);
oldlen = STARTBLOCKVAL(left.br_startblock) +
STARTBLOCKVAL(new->br_startblock) +
STARTBLOCKVAL(right.br_startblock);
newlen = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmap_trace_delete(fname, "LC|RC", ip, idx, 1,
XFS_DATA_FORK);
xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
break;
case MASK(LEFT_CONTIG):
/*
* New allocation is contiguous with a delayed allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
temp = left.br_blockcount + new->br_blockcount;
xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep - 1, temp);
oldlen = STARTBLOCKVAL(left.br_startblock) +
STARTBLOCKVAL(new->br_startblock);
newlen = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
break;
case MASK(RIGHT_CONTIG):
/*
* New allocation is contiguous with a delayed allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
xfs_bmap_trace_pre_update(fname, "RC", ip, idx, XFS_DATA_FORK);
temp = new->br_blockcount + right.br_blockcount;
oldlen = STARTBLOCKVAL(new->br_startblock) +
STARTBLOCKVAL(right.br_startblock);
newlen = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_allf(ep, new->br_startoff,
NULLSTARTBLOCK((int)newlen), temp, right.br_state);
xfs_bmap_trace_post_update(fname, "RC", ip, idx, XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
break;
case 0:
/*
* New allocation is not contiguous with another
* delayed allocation.
* Insert a new entry.
*/
oldlen = newlen = 0;
xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
XFS_DATA_FORK);
xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
break;
}
if (oldlen != newlen) {
ASSERT(oldlen > newlen);
xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
(int)(oldlen - newlen), rsvd);
/*
* Nothing to do for disk quota accounting here.
*/
}
*logflagsp = 0;
return 0;
#undef MASK
#undef MASK2
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
}
/*
* Called by xfs_bmap_add_extent to handle cases converting a hole
* to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to put in extent list */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *ep; /* pointer to extent entry ins. point */
int error; /* error return value */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_add_extent_hole_real";
#endif
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int state; /* state bits, accessed thru macros */
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
ep = &ifp->if_u1.if_extents[idx];
state = 0;
/*
* Check and set flags if this segment has a left neighbor.
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
xfs_bmbt_get_all(ep - 1, &left);
STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
}
/*
* Check and set flags if this segment has a current value.
* Not true if we're inserting into the "hole" at eof.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
xfs_bmbt_get_all(ep, &right);
STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
}
/*
* We're inserting a real allocation between "left" and "right".
* Set the contiguity flags. Don't let extents get too large.
*/
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_startblock + left.br_blockcount == new->br_startblock &&
left.br_state == new->br_state &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_startblock + new->br_blockcount ==
right.br_startblock &&
new->br_state == right.br_state &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!STATE_TEST(LEFT_CONTIG) ||
left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN));
/*
* Select which case we're in here, and implement it.
*/
switch (SWITCH_STATE) {
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
/*
* New allocation is contiguous with real allocations on the
* left and on the right.
* Merge all three into a single extent list entry.
*/
xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
whichfork);
xfs_bmbt_set_blockcount(ep - 1,
left.br_blockcount + new->br_blockcount +
right.br_blockcount);
xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
whichfork);
xfs_bmap_trace_delete(fname, "LC|RC", ip,
idx, 1, whichfork);
xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
ifp->if_lastex = idx - 1;
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
if (cur == NULL) {
*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
return 0;
}
*logflagsp = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
right.br_startblock, right.br_blockcount, &i)))
return error;
ASSERT(i == 1);
if ((error = xfs_bmbt_delete(cur, &i)))
return error;
ASSERT(i == 1);
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
return error;
ASSERT(i == 1);
error = xfs_bmbt_update(cur, left.br_startoff,
left.br_startblock,
left.br_blockcount + new->br_blockcount +
right.br_blockcount, left.br_state);
return error;
case MASK(LEFT_CONTIG):
/*
* New allocation is contiguous with a real allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1, whichfork);
xfs_bmbt_set_blockcount(ep - 1,
left.br_blockcount + new->br_blockcount);
xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1, whichfork);
ifp->if_lastex = idx - 1;
if (cur == NULL) {
*logflagsp = XFS_ILOG_FEXT(whichfork);
return 0;
}
*logflagsp = 0;
if ((error = xfs_bmbt_lookup_eq(cur, left.br_startoff,
left.br_startblock, left.br_blockcount, &i)))
return error;
ASSERT(i == 1);
error = xfs_bmbt_update(cur, left.br_startoff,
left.br_startblock,
left.br_blockcount + new->br_blockcount,
left.br_state);
return error;
case MASK(RIGHT_CONTIG):
/*
* New allocation is contiguous with a real allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
xfs_bmap_trace_pre_update(fname, "RC", ip, idx, whichfork);
xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
new->br_blockcount + right.br_blockcount,
right.br_state);
xfs_bmap_trace_post_update(fname, "RC", ip, idx, whichfork);
ifp->if_lastex = idx;
if (cur == NULL) {
*logflagsp = XFS_ILOG_FEXT(whichfork);
return 0;
}
*logflagsp = 0;
if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
right.br_startblock, right.br_blockcount, &i)))
return error;
ASSERT(i == 1);
error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock,
new->br_blockcount + right.br_blockcount,
right.br_state);
return error;
case 0:
/*
* New allocation is not contiguous with another
* real allocation.
* Insert a new entry.
*/
xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
whichfork);
xfs_bmap_insert_exlist(ip, idx, 1, new, whichfork);
ifp->if_lastex = idx;
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
if (cur == NULL) {
*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
return 0;
}
*logflagsp = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount, &i)))
return error;
ASSERT(i == 0);
cur->bc_rec.b.br_state = new->br_state;
if ((error = xfs_bmbt_insert(cur, &i)))
return error;
ASSERT(i == 1);
return 0;
}
#undef MASK
#undef MASK2
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
/* NOTREACHED */
ASSERT(0);
return 0; /* keep gcc quite */
}
/*
* Adjust the size of the new extent based on di_extsize and rt extsize.
*/
STATIC int
xfs_bmap_extsize_align(
xfs_mount_t *mp,
xfs_bmbt_irec_t *gotp, /* next extent pointer */
xfs_bmbt_irec_t *prevp, /* previous extent pointer */
xfs_extlen_t extsz, /* align to this extent size */
int rt, /* is this a realtime inode? */
int eof, /* is extent at end-of-file? */
int delay, /* creating delalloc extent? */
int convert, /* overwriting unwritten extent? */
xfs_fileoff_t *offp, /* in/out: aligned offset */
xfs_extlen_t *lenp) /* in/out: aligned length */
{
xfs_fileoff_t orig_off; /* original offset */
xfs_extlen_t orig_alen; /* original length */
xfs_fileoff_t orig_end; /* original off+len */
xfs_fileoff_t nexto; /* next file offset */
xfs_fileoff_t prevo; /* previous file offset */
xfs_fileoff_t align_off; /* temp for offset */
xfs_extlen_t align_alen; /* temp for length */
xfs_extlen_t temp; /* temp for calculations */
if (convert)
return 0;
orig_off = align_off = *offp;
orig_alen = align_alen = *lenp;
orig_end = orig_off + orig_alen;
/*
* If this request overlaps an existing extent, then don't
* attempt to perform any additional alignment.
*/
if (!delay && !eof &&
(orig_off >= gotp->br_startoff) &&
(orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
return 0;
}
/*
* If the file offset is unaligned vs. the extent size
* we need to align it. This will be possible unless
* the file was previously written with a kernel that didn't
* perform this alignment, or if a truncate shot us in the
* foot.
*/
temp = do_mod(orig_off, extsz);
if (temp) {
align_alen += temp;
align_off -= temp;
}
/*
* Same adjustment for the end of the requested area.
*/
if ((temp = (align_alen % extsz))) {
align_alen += extsz - temp;
}
/*
* If the previous block overlaps with this proposed allocation
* then move the start forward without adjusting the length.
*/
if (prevp->br_startoff != NULLFILEOFF) {
if (prevp->br_startblock == HOLESTARTBLOCK)
prevo = prevp->br_startoff;
else
prevo = prevp->br_startoff + prevp->br_blockcount;
} else
prevo = 0;
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
/*
* If the next block overlaps with this proposed allocation
* then move the start back without adjusting the length,
* but not before offset 0.
* This may of course make the start overlap previous block,
* and if we hit the offset 0 limit then the next block
* can still overlap too.
*/
if (!eof && gotp->br_startoff != NULLFILEOFF) {
if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
(!delay && gotp->br_startblock == DELAYSTARTBLOCK))
nexto = gotp->br_startoff + gotp->br_blockcount;
else
nexto = gotp->br_startoff;
} else
nexto = NULLFILEOFF;
if (!eof &&
align_off + align_alen != orig_end &&
align_off + align_alen > nexto)
align_off = nexto > align_alen ? nexto - align_alen : 0;
/*
* If we're now overlapping the next or previous extent that
* means we can't fit an extsz piece in this hole. Just move
* the start forward to the first valid spot and set
* the length so we hit the end.
*/
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
if (align_off + align_alen != orig_end &&
align_off + align_alen > nexto &&
nexto != NULLFILEOFF) {
ASSERT(nexto > prevo);
align_alen = nexto - align_off;
}
/*
* If realtime, and the result isn't a multiple of the realtime
* extent size we need to remove blocks until it is.
*/
if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
/*
* We're not covering the original request, or
* we won't be able to once we fix the length.
*/
if (orig_off < align_off ||
orig_end > align_off + align_alen ||
align_alen - temp < orig_alen)
return XFS_ERROR(EINVAL);
/*
* Try to fix it by moving the start up.
*/
if (align_off + temp <= orig_off) {
align_alen -= temp;
align_off += temp;
}
/*
* Try to fix it by moving the end in.
*/
else if (align_off + align_alen - temp >= orig_end)
align_alen -= temp;
/*
* Set the start to the minimum then trim the length.
*/
else {
align_alen -= orig_off - align_off;
align_off = orig_off;
align_alen -= align_alen % mp->m_sb.sb_rextsize;
}
/*
* Result doesn't cover the request, fail it.
*/
if (orig_off < align_off || orig_end > align_off + align_alen)
return XFS_ERROR(EINVAL);
} else {
ASSERT(orig_off >= align_off);
ASSERT(orig_end <= align_off + align_alen);
}
#ifdef DEBUG
if (!eof && gotp->br_startoff != NULLFILEOFF)
ASSERT(align_off + align_alen <= gotp->br_startoff);
if (prevp->br_startoff != NULLFILEOFF)
ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
#endif
*lenp = align_alen;
*offp = align_off;
return 0;
}
#define XFS_ALLOC_GAP_UNITS 4
/*
* xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
* It figures out where to ask the underlying allocator to put the new extent.
*/
STATIC int
xfs_bmap_alloc(
xfs_bmalloca_t *ap) /* bmap alloc argument struct */
{
xfs_fsblock_t adjust; /* adjustment to block numbers */
xfs_alloctype_t atype=0; /* type for allocation routines */
int error; /* error return value */
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
xfs_mount_t *mp; /* mount point structure */
int nullfb; /* true if ap->firstblock isn't set */
int rt; /* true if inode is realtime */
xfs_extlen_t prod = 0; /* product factor for allocators */
xfs_extlen_t ralen = 0; /* realtime allocation length */
xfs_extlen_t align; /* minimum allocation alignment */
xfs_rtblock_t rtx;
#define ISVALID(x,y) \
(rt ? \
(x) < mp->m_sb.sb_rblocks : \
XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
/*
* Set up variables.
*/
mp = ap->ip->i_mount;
nullfb = ap->firstblock == NULLFSBLOCK;
rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
if (rt) {
align = ap->ip->i_d.di_extsize ?
ap->ip->i_d.di_extsize : mp->m_sb.sb_rextsize;
/* Set prod to match the extent size */
prod = align / mp->m_sb.sb_rextsize;
error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
align, rt, ap->eof, 0,
ap->conv, &ap->off, &ap->alen);
if (error)
return error;
ASSERT(ap->alen);
ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
/*
* If the offset & length are not perfectly aligned
* then kill prod, it will just get us in trouble.
*/
if (do_mod(ap->off, align) || ap->alen % align)
prod = 1;
/*
* Set ralen to be the actual requested length in rtextents.
*/
ralen = ap->alen / mp->m_sb.sb_rextsize;
/*
* If the old value was close enough to MAXEXTLEN that
* we rounded up to it, cut it back so it's valid again.
* Note that if it's a really large request (bigger than
* MAXEXTLEN), we don't hear about that number, and can't
* adjust the starting point to match it.
*/
if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
/*
* If it's an allocation to an empty file at offset 0,
* pick an extent that will space things out in the rt area.
*/
if (ap->eof && ap->off == 0) {
error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
if (error)
return error;
ap->rval = rtx * mp->m_sb.sb_rextsize;
} else
ap->rval = 0;
} else {
align = (ap->userdata && ap->ip->i_d.di_extsize &&
(ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)) ?
ap->ip->i_d.di_extsize : 0;
if (unlikely(align)) {
error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
align, rt,
ap->eof, 0, ap->conv,
&ap->off, &ap->alen);
ASSERT(!error);
ASSERT(ap->alen);
}
if (nullfb)
ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
else
ap->rval = ap->firstblock;
}
/*
* If allocating at eof, and there's a previous real block,
* try to use it's last block as our starting point.
*/
if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
!ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
ap->prevp->br_startblock)) {
ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
/*
* Adjust for the gap between prevp and us.
*/
adjust = ap->off -
(ap->prevp->br_startoff + ap->prevp->br_blockcount);
if (adjust &&
ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
ap->rval += adjust;
}
/*
* If not at eof, then compare the two neighbor blocks.
* Figure out whether either one gives us a good starting point,
* and pick the better one.
*/
else if (!ap->eof) {
xfs_fsblock_t gotbno; /* right side block number */
xfs_fsblock_t gotdiff=0; /* right side difference */
xfs_fsblock_t prevbno; /* left side block number */
xfs_fsblock_t prevdiff=0; /* left side difference */
/*
* If there's a previous (left) block, select a requested
* start block based on it.
*/
if (ap->prevp->br_startoff != NULLFILEOFF &&
!ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
(prevbno = ap->prevp->br_startblock +
ap->prevp->br_blockcount) &&
ISVALID(prevbno, ap->prevp->br_startblock)) {
/*
* Calculate gap to end of previous block.
*/
adjust = prevdiff = ap->off -
(ap->prevp->br_startoff +
ap->prevp->br_blockcount);
/*
* Figure the startblock based on the previous block's
* end and the gap size.
* Heuristic!
* If the gap is large relative to the piece we're
* allocating, or using it gives us an invalid block
* number, then just use the end of the previous block.
*/
if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
ISVALID(prevbno + prevdiff,
ap->prevp->br_startblock))
prevbno += adjust;
else
prevdiff += adjust;
/*
* If the firstblock forbids it, can't use it,
* must use default.
*/
if (!rt && !nullfb &&
XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
prevbno = NULLFSBLOCK;
}
/*
* No previous block or can't follow it, just default.
*/
else
prevbno = NULLFSBLOCK;
/*
* If there's a following (right) block, select a requested
* start block based on it.
*/
if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
/*
* Calculate gap to start of next block.
*/
adjust = gotdiff = ap->gotp->br_startoff - ap->off;
/*
* Figure the startblock based on the next block's
* start and the gap size.
*/
gotbno = ap->gotp->br_startblock;
/*
* Heuristic!
* If the gap is large relative to the piece we're
* allocating, or using it gives us an invalid block
* number, then just use the start of the next block
* offset by our length.
*/
if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
ISVALID(gotbno - gotdiff, gotbno))
gotbno -= adjust;
else if (ISVALID(gotbno - ap->alen, gotbno)) {
gotbno -= ap->alen;
gotdiff += adjust - ap->alen;
} else
gotdiff += adjust;
/*
* If the firstblock forbids it, can't use it,
* must use default.
*/
if (!rt && !nullfb &&
XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
gotbno = NULLFSBLOCK;
}
/*
* No next block, just default.
*/
else
gotbno = NULLFSBLOCK;
/*
* If both valid, pick the better one, else the only good
* one, else ap->rval is already set (to 0 or the inode block).
*/
if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
else if (prevbno != NULLFSBLOCK)
ap->rval = prevbno;
else if (gotbno != NULLFSBLOCK)
ap->rval = gotbno;
}
/*
* If allowed, use ap->rval; otherwise must use firstblock since
* it's in the right allocation group.
*/
if (nullfb || rt || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
;
else
ap->rval = ap->firstblock;
/*
* Realtime allocation, done through xfs_rtallocate_extent.
*/
if (rt) {
#ifndef __KERNEL__
ASSERT(0);
#else
xfs_rtblock_t rtb;
atype = ap->rval == 0 ?
XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
do_div(ap->rval, mp->m_sb.sb_rextsize);
rtb = ap->rval;
ap->alen = ralen;
if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
&ralen, atype, ap->wasdel, prod, &rtb)))
return error;
if (rtb == NULLFSBLOCK && prod > 1 &&
(error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
ap->alen, &ralen, atype,
ap->wasdel, 1, &rtb)))
return error;
ap->rval = rtb;
if (ap->rval != NULLFSBLOCK) {
ap->rval *= mp->m_sb.sb_rextsize;
ralen *= mp->m_sb.sb_rextsize;
ap->alen = ralen;
ap->ip->i_d.di_nblocks += ralen;
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
if (ap->wasdel)
ap->ip->i_delayed_blks -= ralen;
/*
* Adjust the disk quota also. This was reserved
* earlier.
*/
XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
XFS_TRANS_DQ_RTBCOUNT,
(long) ralen);
} else
ap->alen = 0;
#endif /* __KERNEL__ */
}
/*
* Normal allocation, done through xfs_alloc_vextent.
*/
else {
xfs_agnumber_t ag;
xfs_alloc_arg_t args;
xfs_extlen_t blen;
xfs_extlen_t delta;
int isaligned;
xfs_extlen_t longest;
xfs_extlen_t need;
xfs_extlen_t nextminlen=0;
int notinit;
xfs_perag_t *pag;
xfs_agnumber_t startag;
int tryagain;
tryagain = isaligned = 0;
args.tp = ap->tp;
args.mp = mp;
args.fsbno = ap->rval;
args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
blen = 0;
if (nullfb) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.total = ap->total;
/*
* Find the longest available space.
* We're going to try for the whole allocation at once.
*/
startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
notinit = 0;
down_read(&mp->m_peraglock);
while (blen < ap->alen) {
pag = &mp->m_perag[ag];
if (!pag->pagf_init &&
(error = xfs_alloc_pagf_init(mp, args.tp,
ag, XFS_ALLOC_FLAG_TRYLOCK))) {
up_read(&mp->m_peraglock);
return error;
}
/*
* See xfs_alloc_fix_freelist...
*/
if (pag->pagf_init) {
need = XFS_MIN_FREELIST_PAG(pag, mp);
delta = need > pag->pagf_flcount ?
need - pag->pagf_flcount : 0;
longest = (pag->pagf_longest > delta) ?
(pag->pagf_longest - delta) :
(pag->pagf_flcount > 0 ||
pag->pagf_longest > 0);
if (blen < longest)
blen = longest;
} else
notinit = 1;
if (++ag == mp->m_sb.sb_agcount)
ag = 0;
if (ag == startag)
break;
}
up_read(&mp->m_peraglock);
/*
* Since the above loop did a BUF_TRYLOCK, it is
* possible that there is space for this request.
*/
if (notinit || blen < ap->minlen)
args.minlen = ap->minlen;
/*
* If the best seen length is less than the request
* length, use the best as the minimum.
*/
else if (blen < ap->alen)
args.minlen = blen;
/*
* Otherwise we've seen an extent as big as alen,
* use that as the minimum.
*/
else
args.minlen = ap->alen;
} else if (ap->low) {
args.type = XFS_ALLOCTYPE_FIRST_AG;
args.total = args.minlen = ap->minlen;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.total = ap->total;
args.minlen = ap->minlen;
}
if (unlikely(ap->userdata && ap->ip->i_d.di_extsize &&
(ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE))) {
args.prod = ap->ip->i_d.di_extsize;
if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
args.mod = (xfs_extlen_t)(args.prod - args.mod);
} else if (unlikely(mp->m_sb.sb_blocksize >= NBPP)) {
args.prod = 1;
args.mod = 0;
} else {
args.prod = NBPP >> mp->m_sb.sb_blocklog;
if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
args.mod = (xfs_extlen_t)(args.prod - args.mod);
}
/*
* If we are not low on available data blocks, and the
* underlying logical volume manager is a stripe, and
* the file offset is zero then try to allocate data
* blocks on stripe unit boundary.
* NOTE: ap->aeof is only set if the allocation length
* is >= the stripe unit and the allocation offset is
* at the end of file.
*/
if (!ap->low && ap->aeof) {
if (!ap->off) {
args.alignment = mp->m_dalign;
atype = args.type;
isaligned = 1;
/*
* Adjust for alignment
*/
if (blen > args.alignment && blen <= ap->alen)
args.minlen = blen - args.alignment;
args.minalignslop = 0;
} else {
/*
* First try an exact bno allocation.
* If it fails then do a near or start bno
* allocation with alignment turned on.
*/
atype = args.type;
tryagain = 1;
args.type = XFS_ALLOCTYPE_THIS_BNO;
args.alignment = 1;
/*
* Compute the minlen+alignment for the
* next case. Set slop so that the value
* of minlen+alignment+slop doesn't go up
* between the calls.
*/
if (blen > mp->m_dalign && blen <= ap->alen)
nextminlen = blen - mp->m_dalign;
else
nextminlen = args.minlen;
if (nextminlen + mp->m_dalign > args.minlen + 1)
args.minalignslop =
nextminlen + mp->m_dalign -
args.minlen - 1;
else
args.minalignslop = 0;
}
} else {
args.alignment = 1;
args.minalignslop = 0;
}
args.minleft = ap->minleft;
args.wasdel = ap->wasdel;
args.isfl = 0;
args.userdata = ap->userdata;
if ((error = xfs_alloc_vextent(&args)))
return error;
if (tryagain && args.fsbno == NULLFSBLOCK) {
/*
* Exact allocation failed. Now try with alignment
* turned on.
*/
args.type = atype;
args.fsbno = ap->rval;
args.alignment = mp->m_dalign;
args.minlen = nextminlen;
args.minalignslop = 0;
isaligned = 1;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (isaligned && args.fsbno == NULLFSBLOCK) {
/*
* allocation failed, so turn off alignment and
* try again.
*/
args.type = atype;
args.fsbno = ap->rval;
args.alignment = 0;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (args.fsbno == NULLFSBLOCK && nullfb &&
args.minlen > ap->minlen) {
args.minlen = ap->minlen;
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = ap->rval;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (args.fsbno == NULLFSBLOCK && nullfb) {
args.fsbno = 0;
args.type = XFS_ALLOCTYPE_FIRST_AG;
args.total = ap->minlen;
args.minleft = 0;
if ((error = xfs_alloc_vextent(&args)))
return error;
ap->low = 1;
}
if (args.fsbno != NULLFSBLOCK) {
ap->firstblock = ap->rval = args.fsbno;
ASSERT(nullfb || fb_agno == args.agno ||
(ap->low && fb_agno < args.agno));
ap->alen = args.len;
ap->ip->i_d.di_nblocks += args.len;
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
if (ap->wasdel)
ap->ip->i_delayed_blks -= args.len;
/*
* Adjust the disk quota also. This was reserved
* earlier.
*/
XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
XFS_TRANS_DQ_BCOUNT,
(long) args.len);
} else {
ap->rval = NULLFSBLOCK;
ap->alen = 0;
}
}
return 0;
#undef ISVALID
}
/*
* Transform a btree format file with only one leaf node, where the
* extents list will fit in the inode, into an extents format file.
* Since the extent list is already in-core, all we have to do is
* give up the space for the btree root and pitch the leaf block.
*/
STATIC int /* error */
xfs_bmap_btree_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_btree_cur_t *cur, /* btree cursor */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
/* REFERENCED */
xfs_bmbt_block_t *cblock;/* child btree block */
xfs_fsblock_t cbno; /* child block number */
xfs_buf_t *cbp; /* child block's buffer */
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork data */
xfs_mount_t *mp; /* mount point structure */
xfs_bmbt_ptr_t *pp; /* ptr to block address */
xfs_bmbt_block_t *rblock;/* root btree block */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
rblock = ifp->if_broot;
ASSERT(be16_to_cpu(rblock->bb_level) == 1);
ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
mp = ip->i_mount;
pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
*logflagsp = 0;
#ifdef DEBUG
if ((error = xfs_btree_check_lptr(cur, INT_GET(*pp, ARCH_CONVERT), 1)))
return error;
#endif
cbno = INT_GET(*pp, ARCH_CONVERT);
if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
XFS_BMAP_BTREE_REF)))
return error;
cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
return error;
xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
ip->i_d.di_nblocks--;
XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, cbp);
if (cur->bc_bufs[0] == cbp)
cur->bc_bufs[0] = NULL;
xfs_iroot_realloc(ip, -1, whichfork);
ASSERT(ifp->if_broot == NULL);
ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
return 0;
}
/*
* Called by xfs_bmapi to update extent list structure and the btree
* after removing space (or undoing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_del_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_trans_t *tp, /* current transaction pointer */
xfs_extnum_t idx, /* extent number to update/delete */
xfs_bmap_free_t *flist, /* list of extents to be freed */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *del, /* data to remove from extent list */
int *logflagsp, /* inode logging flags */
int whichfork, /* data or attr fork */
int rsvd) /* OK to allocate reserved blocks */
{
xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
xfs_fsblock_t del_endblock=0; /* first block past del */
xfs_fileoff_t del_endoff; /* first offset past del */
int delay; /* current block is delayed allocated */
int do_fx; /* free extent at end of routine */
xfs_bmbt_rec_t *ep; /* current extent entry pointer */
int error; /* error return value */
int flags; /* inode logging flags */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_del_extent";
#endif
xfs_bmbt_irec_t got; /* current extent entry */
xfs_fileoff_t got_endoff; /* first offset past got */
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_mount_t *mp; /* mount structure */
xfs_filblks_t nblks; /* quota/sb block count */
xfs_bmbt_irec_t new; /* new record to be inserted */
/* REFERENCED */
xfs_extnum_t nextents; /* number of extents in list */
uint qfield; /* quota field to update */
xfs_filblks_t temp; /* for indirect length calculations */
xfs_filblks_t temp2; /* for indirect length calculations */
XFS_STATS_INC(xs_del_exlist);
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(idx >= 0 && idx < nextents);
ASSERT(del->br_blockcount > 0);
ep = &ifp->if_u1.if_extents[idx];
xfs_bmbt_get_all(ep, &got);
ASSERT(got.br_startoff <= del->br_startoff);
del_endoff = del->br_startoff + del->br_blockcount;
got_endoff = got.br_startoff + got.br_blockcount;
ASSERT(got_endoff >= del_endoff);
delay = ISNULLSTARTBLOCK(got.br_startblock);
ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
flags = 0;
qfield = 0;
error = 0;
/*
* If deleting a real allocation, must free up the disk space.
*/
if (!delay) {
flags = XFS_ILOG_CORE;
/*
* Realtime allocation. Free it and record di_nblocks update.
*/
if (whichfork == XFS_DATA_FORK &&
(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
xfs_fsblock_t bno;
xfs_filblks_t len;
ASSERT(do_mod(del->br_blockcount,
mp->m_sb.sb_rextsize) == 0);
ASSERT(do_mod(del->br_startblock,
mp->m_sb.sb_rextsize) == 0);
bno = del->br_startblock;
len = del->br_blockcount;
do_div(bno, mp->m_sb.sb_rextsize);
do_div(len, mp->m_sb.sb_rextsize);
if ((error = xfs_rtfree_extent(ip->i_transp, bno,
(xfs_extlen_t)len)))
goto done;
do_fx = 0;
nblks = len * mp->m_sb.sb_rextsize;
qfield = XFS_TRANS_DQ_RTBCOUNT;
}
/*
* Ordinary allocation.
*/
else {
do_fx = 1;
nblks = del->br_blockcount;
qfield = XFS_TRANS_DQ_BCOUNT;
}
/*
* Set up del_endblock and cur for later.
*/
del_endblock = del->br_startblock + del->br_blockcount;
if (cur) {
if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
got.br_startblock, got.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
}
da_old = da_new = 0;
} else {
da_old = STARTBLOCKVAL(got.br_startblock);
da_new = 0;
nblks = 0;
do_fx = 0;
}
/*
* Set flag value to use in switch statement.
* Left-contig is 2, right-contig is 1.
*/
switch (((got.br_startoff == del->br_startoff) << 1) |
(got_endoff == del_endoff)) {
case 3:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_bmap_trace_delete(fname, "3", ip, idx, 1, whichfork);
xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
ifp->if_lastex = idx;
if (delay)
break;
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
flags |= XFS_ILOG_CORE;
if (!cur) {
flags |= XFS_ILOG_FEXT(whichfork);
break;
}
if ((error = xfs_bmbt_delete(cur, &i)))
goto done;
ASSERT(i == 1);
break;
case 2:
/*
* Deleting the first part of the extent.
*/
xfs_bmap_trace_pre_update(fname, "2", ip, idx, whichfork);
xfs_bmbt_set_startoff(ep, del_endoff);
temp = got.br_blockcount - del->br_blockcount;
xfs_bmbt_set_blockcount(ep, temp);
ifp->if_lastex = idx;
if (delay) {
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
da_old);
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
xfs_bmap_trace_post_update(fname, "2", ip, idx,
whichfork);
da_new = temp;
break;
}
xfs_bmbt_set_startblock(ep, del_endblock);
xfs_bmap_trace_post_update(fname, "2", ip, idx, whichfork);
if (!cur) {
flags |= XFS_ILOG_FEXT(whichfork);
break;
}
if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
got.br_blockcount - del->br_blockcount,
got.br_state)))
goto done;
break;
case 1:
/*
* Deleting the last part of the extent.
*/
temp = got.br_blockcount - del->br_blockcount;
xfs_bmap_trace_pre_update(fname, "1", ip, idx, whichfork);
xfs_bmbt_set_blockcount(ep, temp);
ifp->if_lastex = idx;
if (delay) {
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
da_old);
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
xfs_bmap_trace_post_update(fname, "1", ip, idx,
whichfork);
da_new = temp;
break;
}
xfs_bmap_trace_post_update(fname, "1", ip, idx, whichfork);
if (!cur) {
flags |= XFS_ILOG_FEXT(whichfork);
break;
}
if ((error = xfs_bmbt_update(cur, got.br_startoff,
got.br_startblock,
got.br_blockcount - del->br_blockcount,
got.br_state)))
goto done;
break;
case 0:
/*
* Deleting the middle of the extent.
*/
temp = del->br_startoff - got.br_startoff;
xfs_bmap_trace_pre_update(fname, "0", ip, idx, whichfork);
xfs_bmbt_set_blockcount(ep, temp);
new.br_startoff = del_endoff;
temp2 = got_endoff - del_endoff;
new.br_blockcount = temp2;
new.br_state = got.br_state;
if (!delay) {
new.br_startblock = del_endblock;
flags |= XFS_ILOG_CORE;
if (cur) {
if ((error = xfs_bmbt_update(cur,
got.br_startoff,
got.br_startblock, temp,
got.br_state)))
goto done;
if ((error = xfs_bmbt_increment(cur, 0, &i)))
goto done;
cur->bc_rec.b = new;
error = xfs_bmbt_insert(cur, &i);
if (error && error != ENOSPC)
goto done;
/*
* If get no-space back from btree insert,
* it tried a split, and we have a zero
* block reservation.
* Fix up our state and return the error.
*/
if (error == ENOSPC) {
/*
* Reset the cursor, don't trust
* it after any insert operation.
*/
if ((error = xfs_bmbt_lookup_eq(cur,
got.br_startoff,
got.br_startblock,
temp, &i)))
goto done;
ASSERT(i == 1);
/*
* Update the btree record back
* to the original value.
*/
if ((error = xfs_bmbt_update(cur,
got.br_startoff,
got.br_startblock,
got.br_blockcount,
got.br_state)))
goto done;
/*
* Reset the extent record back
* to the original value.
*/
xfs_bmbt_set_blockcount(ep,
got.br_blockcount);
flags = 0;
error = XFS_ERROR(ENOSPC);
goto done;
}
ASSERT(i == 1);
} else
flags |= XFS_ILOG_FEXT(whichfork);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
} else {
ASSERT(whichfork == XFS_DATA_FORK);
temp = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
temp2 = xfs_bmap_worst_indlen(ip, temp2);
new.br_startblock = NULLSTARTBLOCK((int)temp2);
da_new = temp + temp2;
while (da_new > da_old) {
if (temp) {
temp--;
da_new--;
xfs_bmbt_set_startblock(ep,
NULLSTARTBLOCK((int)temp));
}
if (da_new == da_old)
break;
if (temp2) {
temp2--;
da_new--;
new.br_startblock =
NULLSTARTBLOCK((int)temp2);
}
}
}
xfs_bmap_trace_post_update(fname, "0", ip, idx, whichfork);
xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 1, &new, NULL,
whichfork);
xfs_bmap_insert_exlist(ip, idx + 1, 1, &new, whichfork);
ifp->if_lastex = idx + 1;
break;
}
/*
* If we need to, add to list of extents to delete.
*/
if (do_fx)
xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
mp);
/*
* Adjust inode # blocks in the file.
*/
if (nblks)
ip->i_d.di_nblocks -= nblks;
/*
* Adjust quota data.
*/
if (qfield)
XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
/*
* Account for change in delayed indirect blocks.
* Nothing to do for disk quota accounting here.
*/
ASSERT(da_old >= da_new);
if (da_old > da_new)
xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int)(da_old - da_new),
rsvd);
done:
*logflagsp = flags;
return error;
}
/*
* Remove the entry "free" from the free item list. Prev points to the
* previous entry, unless "free" is the head of the list.
*/
STATIC void
xfs_bmap_del_free(
xfs_bmap_free_t *flist, /* free item list header */
xfs_bmap_free_item_t *prev, /* previous item on list, if any */
xfs_bmap_free_item_t *free) /* list item to be freed */
{
if (prev)
prev->xbfi_next = free->xbfi_next;
else
flist->xbf_first = free->xbfi_next;
flist->xbf_count--;
kmem_zone_free(xfs_bmap_free_item_zone, free);
}
/*
* Remove count entries from the extents array for inode "ip", starting
* at index "idx". Copies the remaining items down over the deleted ones,
* and gives back the excess memory.
*/
STATIC void
xfs_bmap_delete_exlist(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* starting delete index */
xfs_extnum_t count, /* count of items to delete */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *base; /* base of extent list */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* number of extents in list after */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
base = ifp->if_u1.if_extents;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - count;
memmove(&base[idx], &base[idx + count],
(nextents - idx) * sizeof(*base));
xfs_iext_realloc(ip, -count, whichfork);
}
/*
* Convert an extents-format file into a btree-format file.
* The new file will have a root block (in the inode) and a single child block.
*/
STATIC int /* error */
xfs_bmap_extents_to_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first-block-allocated */
xfs_bmap_free_t *flist, /* blocks freed in xaction */
xfs_btree_cur_t **curp, /* cursor returned to caller */
int wasdel, /* converting a delayed alloc */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
xfs_bmbt_block_t *ablock; /* allocated (child) bt block */
xfs_buf_t *abp; /* buffer for ablock */
xfs_alloc_arg_t args; /* allocation arguments */
xfs_bmbt_rec_t *arp; /* child record pointer */
xfs_bmbt_block_t *block; /* btree root block */
xfs_btree_cur_t *cur; /* bmap btree cursor */
xfs_bmbt_rec_t *ep; /* extent list pointer */
int error; /* error return value */
xfs_extnum_t i, cnt; /* extent list index */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_key_t *kp; /* root block key pointer */
xfs_mount_t *mp; /* mount structure */
xfs_extnum_t nextents; /* extent list size */
xfs_bmbt_ptr_t *pp; /* root block address pointer */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
/*
* Make space in the inode incore.
*/
xfs_iroot_realloc(ip, 1, whichfork);
ifp->if_flags |= XFS_IFBROOT;
/*
* Fill in the root.
*/
block = ifp->if_broot;
block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
block->bb_level = cpu_to_be16(1);
block->bb_numrecs = cpu_to_be16(1);
block->bb_leftsib = cpu_to_be64(NULLDFSBNO);
block->bb_rightsib = cpu_to_be64(NULLDFSBNO);
/*
* Need a cursor. Can't allocate until bb_level is filled in.
*/
mp = ip->i_mount;
cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
whichfork);
cur->bc_private.b.firstblock = *firstblock;
cur->bc_private.b.flist = flist;
cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
/*
* Convert to a btree with two levels, one record in root.
*/
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
args.tp = tp;
args.mp = mp;
if (*firstblock == NULLFSBLOCK) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
} else if (flist->xbf_low) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = *firstblock;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.fsbno = *firstblock;
}
args.minlen = args.maxlen = args.prod = 1;
args.total = args.minleft = args.alignment = args.mod = args.isfl =
args.minalignslop = 0;
args.wasdel = wasdel;
*logflagsp = 0;
if ((error = xfs_alloc_vextent(&args))) {
xfs_iroot_realloc(ip, -1, whichfork);
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Allocation can't fail, the space was reserved.
*/
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(*firstblock == NULLFSBLOCK ||
args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
(flist->xbf_low &&
args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
*firstblock = cur->bc_private.b.firstblock = args.fsbno;
cur->bc_private.b.allocated++;
ip->i_d.di_nblocks++;
XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
/*
* Fill in the child block.
*/
ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
ablock->bb_level = 0;
ablock->bb_leftsib = cpu_to_be64(NULLDFSBNO);
ablock->bb_rightsib = cpu_to_be64(NULLDFSBNO);
arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (ep = ifp->if_u1.if_extents, cnt = i = 0; i < nextents; i++, ep++) {
if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
arp->l0 = INT_GET(ep->l0, ARCH_CONVERT);
arp->l1 = INT_GET(ep->l1, ARCH_CONVERT);
arp++; cnt++;
}
}
ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
ablock->bb_numrecs = cpu_to_be16(cnt);
/*
* Fill in the root key and pointer.
*/
kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
INT_SET(kp->br_startoff, ARCH_CONVERT, xfs_bmbt_disk_get_startoff(arp));
pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
INT_SET(*pp, ARCH_CONVERT, args.fsbno);
/*
* Do all this logging at the end so that
* the root is at the right level.
*/
xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
xfs_bmbt_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
ASSERT(*curp == NULL);
*curp = cur;
*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
return 0;
}
/*
* Insert new item(s) in the extent list for inode "ip".
* Count new items are inserted at offset idx.
*/
STATIC void
xfs_bmap_insert_exlist(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* starting index of new items */
xfs_extnum_t count, /* number of inserted items */
xfs_bmbt_irec_t *new, /* items to insert */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *base; /* extent list base */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* extent list size */
xfs_extnum_t to; /* extent list index */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
xfs_iext_realloc(ip, count, whichfork);
base = ifp->if_u1.if_extents;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
memmove(&base[idx + count], &base[idx],
(nextents - (idx + count)) * sizeof(*base));
for (to = idx; to < idx + count; to++, new++)
xfs_bmbt_set_all(&base[to], new);
}
/*
* Helper routine to reset inode di_forkoff field when switching
* attribute fork from local to extent format - we reset it where
* possible to make space available for inline data fork extents.
*/
STATIC void
xfs_bmap_forkoff_reset(
xfs_mount_t *mp,
xfs_inode_t *ip,
int whichfork)
{
if (whichfork == XFS_ATTR_FORK &&
(ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
(ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
ip->i_d.di_forkoff = mp->m_attroffset >> 3;
ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
(uint)sizeof(xfs_bmbt_rec_t);
ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
(uint)sizeof(xfs_bmbt_rec_t);
}
}
/*
* Convert a local file to an extents file.
* This code is out of bounds for data forks of regular files,
* since the file data needs to get logged so things will stay consistent.
* (The bmap-level manipulations are ok, though).
*/
STATIC int /* error */
xfs_bmap_local_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated in xaction */
xfs_extlen_t total, /* total blocks needed by transaction */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
int error; /* error return value */
int flags; /* logging flags returned */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_local_to_extents";
#endif
xfs_ifork_t *ifp; /* inode fork pointer */
/*
* We don't want to deal with the case of keeping inode data inline yet.
* So sending the data fork of a regular inode is invalid.
*/
ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
whichfork == XFS_DATA_FORK));
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
flags = 0;
error = 0;
if (ifp->if_bytes) {
xfs_alloc_arg_t args; /* allocation arguments */
xfs_buf_t *bp; /* buffer for extent list block */
xfs_bmbt_rec_t *ep; /* extent list pointer */
args.tp = tp;
args.mp = ip->i_mount;
ASSERT(ifp->if_flags & XFS_IFINLINE);
/*
* Allocate a block. We know we need only one, since the
* file currently fits in an inode.
*/
if (*firstblock == NULLFSBLOCK) {
args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
args.type = XFS_ALLOCTYPE_START_BNO;
} else {
args.fsbno = *firstblock;
args.type = XFS_ALLOCTYPE_NEAR_BNO;
}
args.total = total;
args.mod = args.minleft = args.alignment = args.wasdel =
args.isfl = args.minalignslop = 0;
args.minlen = args.maxlen = args.prod = 1;
if ((error = xfs_alloc_vextent(&args)))
goto done;
/*
* Can't fail, the space was reserved.
*/
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(args.len == 1);
*firstblock = args.fsbno;
bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
ifp->if_bytes);
xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
xfs_iext_realloc(ip, 1, whichfork);
ep = ifp->if_u1.if_extents;
xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork);
XFS_IFORK_NEXT_SET(ip, whichfork, 1);
ip->i_d.di_nblocks = 1;
XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
XFS_TRANS_DQ_BCOUNT, 1L);
flags |= XFS_ILOG_FEXT(whichfork);
} else {
ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
}
ifp->if_flags &= ~XFS_IFINLINE;
ifp->if_flags |= XFS_IFEXTENTS;
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
flags |= XFS_ILOG_CORE;
done:
*logflagsp = flags;
return error;
}
xfs_bmbt_rec_t * /* pointer to found extent entry */
xfs_bmap_do_search_extents(
xfs_bmbt_rec_t *base, /* base of extent list */
xfs_extnum_t lastx, /* last extent index used */
xfs_extnum_t nextents, /* extent list size */
xfs_fileoff_t bno, /* block number searched for */
int *eofp, /* out: end of file found */
xfs_extnum_t *lastxp, /* out: last extent index */
xfs_bmbt_irec_t *gotp, /* out: extent entry found */
xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
{
xfs_bmbt_rec_t *ep; /* extent list entry pointer */
xfs_bmbt_irec_t got; /* extent list entry, decoded */
int high; /* high index of binary search */
int low; /* low index of binary search */
/*
* Initialize the extent entry structure to catch access to
* uninitialized br_startblock field.
*/
got.br_startoff = 0xffa5a5a5a5a5a5a5LL;
got.br_blockcount = 0xa55a5a5a5a5a5a5aLL;
got.br_state = XFS_EXT_INVALID;
#if XFS_BIG_BLKNOS
got.br_startblock = 0xffffa5a5a5a5a5a5LL;
#else
got.br_startblock = 0xffffa5a5;
#endif
if (lastx != NULLEXTNUM && lastx < nextents)
ep = base + lastx;
else
ep = NULL;
prevp->br_startoff = NULLFILEOFF;
if (ep && bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep)) &&
bno < got.br_startoff +
(got.br_blockcount = xfs_bmbt_get_blockcount(ep)))
*eofp = 0;
else if (ep && lastx < nextents - 1 &&
bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep + 1)) &&
bno < got.br_startoff +
(got.br_blockcount = xfs_bmbt_get_blockcount(ep + 1))) {
lastx++;
ep++;
*eofp = 0;
} else if (nextents == 0)
*eofp = 1;
else if (bno == 0 &&
(got.br_startoff = xfs_bmbt_get_startoff(base)) == 0) {
ep = base;
lastx = 0;
got.br_blockcount = xfs_bmbt_get_blockcount(ep);
*eofp = 0;
} else {
/* binary search the extents array */
low = 0;
high = nextents - 1;
while (low <= high) {
XFS_STATS_INC(xs_cmp_exlist);
lastx = (low + high) >> 1;
ep = base + lastx;
got.br_startoff = xfs_bmbt_get_startoff(ep);
got.br_blockcount = xfs_bmbt_get_blockcount(ep);
if (bno < got.br_startoff)
high = lastx - 1;
else if (bno >= got.br_startoff + got.br_blockcount)
low = lastx + 1;
else {
got.br_startblock = xfs_bmbt_get_startblock(ep);
got.br_state = xfs_bmbt_get_state(ep);
*eofp = 0;
*lastxp = lastx;
*gotp = got;
return ep;
}
}
if (bno >= got.br_startoff + got.br_blockcount) {
lastx++;
if (lastx == nextents) {
*eofp = 1;
got.br_startblock = xfs_bmbt_get_startblock(ep);
got.br_state = xfs_bmbt_get_state(ep);
*prevp = got;
ep = NULL;
} else {
*eofp = 0;
xfs_bmbt_get_all(ep, prevp);
ep++;
got.br_startoff = xfs_bmbt_get_startoff(ep);
got.br_blockcount = xfs_bmbt_get_blockcount(ep);
}
} else {
*eofp = 0;
if (ep > base)
xfs_bmbt_get_all(ep - 1, prevp);
}
}
if (ep) {
got.br_startblock = xfs_bmbt_get_startblock(ep);
got.br_state = xfs_bmbt_get_state(ep);
}
*lastxp = lastx;
*gotp = got;
return ep;
}
/*
* Search the extents list for the inode, for the extent containing bno.
* If bno lies in a hole, point to the next entry. If bno lies past eof,
* *eofp will be set, and *prevp will contain the last entry (null if none).
* Else, *lastxp will be set to the index of the found
* entry; *gotp will contain the entry.
*/
STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
xfs_bmap_search_extents(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t bno, /* block number searched for */
int whichfork, /* data or attr fork */
int *eofp, /* out: end of file found */
xfs_extnum_t *lastxp, /* out: last extent index */
xfs_bmbt_irec_t *gotp, /* out: extent entry found */
xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
{
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_rec_t *base; /* base of extent list */
xfs_extnum_t lastx; /* last extent index used */
xfs_extnum_t nextents; /* extent list size */
xfs_bmbt_rec_t *ep; /* extent list entry pointer */
int rt; /* realtime flag */
XFS_STATS_INC(xs_look_exlist);
ifp = XFS_IFORK_PTR(ip, whichfork);
lastx = ifp->if_lastex;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
base = &ifp->if_u1.if_extents[0];
ep = xfs_bmap_do_search_extents(base, lastx, nextents, bno, eofp,
lastxp, gotp, prevp);
rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
if (unlikely(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM))) {
cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld "
"start_block : %llx start_off : %llx blkcnt : %llx "
"extent-state : %x \n",
(ip->i_mount)->m_fsname, (long long)ip->i_ino,
(unsigned long long)gotp->br_startblock,
(unsigned long long)gotp->br_startoff,
(unsigned long long)gotp->br_blockcount,
gotp->br_state);
}
return ep;
}
#ifdef XFS_BMAP_TRACE
ktrace_t *xfs_bmap_trace_buf;
/*
* Add a bmap trace buffer entry. Base routine for the others.
*/
STATIC void
xfs_bmap_trace_addentry(
int opcode, /* operation */
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(ies) */
xfs_extnum_t cnt, /* count of entries, 1 or 2 */
xfs_bmbt_rec_t *r1, /* first record */
xfs_bmbt_rec_t *r2, /* second record or null */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t tr2;
ASSERT(cnt == 1 || cnt == 2);
ASSERT(r1 != NULL);
if (cnt == 1) {
ASSERT(r2 == NULL);
r2 = &tr2;
memset(&tr2, 0, sizeof(tr2));
} else
ASSERT(r2 != NULL);
ktrace_enter(xfs_bmap_trace_buf,
(void *)(__psint_t)(opcode | (whichfork << 16)),
(void *)fname, (void *)desc, (void *)ip,
(void *)(__psint_t)idx,
(void *)(__psint_t)cnt,
(void *)(__psunsigned_t)(ip->i_ino >> 32),
(void *)(__psunsigned_t)(unsigned)ip->i_ino,
(void *)(__psunsigned_t)(r1->l0 >> 32),
(void *)(__psunsigned_t)(unsigned)(r1->l0),
(void *)(__psunsigned_t)(r1->l1 >> 32),
(void *)(__psunsigned_t)(unsigned)(r1->l1),
(void *)(__psunsigned_t)(r2->l0 >> 32),
(void *)(__psunsigned_t)(unsigned)(r2->l0),
(void *)(__psunsigned_t)(r2->l1 >> 32),
(void *)(__psunsigned_t)(unsigned)(r2->l1)
);
ASSERT(ip->i_xtrace);
ktrace_enter(ip->i_xtrace,
(void *)(__psint_t)(opcode | (whichfork << 16)),
(void *)fname, (void *)desc, (void *)ip,
(void *)(__psint_t)idx,
(void *)(__psint_t)cnt,
(void *)(__psunsigned_t)(ip->i_ino >> 32),
(void *)(__psunsigned_t)(unsigned)ip->i_ino,
(void *)(__psunsigned_t)(r1->l0 >> 32),
(void *)(__psunsigned_t)(unsigned)(r1->l0),
(void *)(__psunsigned_t)(r1->l1 >> 32),
(void *)(__psunsigned_t)(unsigned)(r1->l1),
(void *)(__psunsigned_t)(r2->l0 >> 32),
(void *)(__psunsigned_t)(unsigned)(r2->l0),
(void *)(__psunsigned_t)(r2->l1 >> 32),
(void *)(__psunsigned_t)(unsigned)(r2->l1)
);
}
/*
* Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
*/
STATIC void
xfs_bmap_trace_delete(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(entries) deleted */
xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
int whichfork) /* data or attr fork */
{
xfs_ifork_t *ifp; /* inode fork pointer */
ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
cnt, &ifp->if_u1.if_extents[idx],
cnt == 2 ? &ifp->if_u1.if_extents[idx + 1] : NULL,
whichfork);
}
/*
* Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
* reading in the extents list from the disk (in the btree).
*/
STATIC void
xfs_bmap_trace_insert(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(entries) inserted */
xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
xfs_bmbt_irec_t *r1, /* inserted record 1 */
xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t tr1; /* compressed record 1 */
xfs_bmbt_rec_t tr2; /* compressed record 2 if needed */
xfs_bmbt_set_all(&tr1, r1);
if (cnt == 2) {
ASSERT(r2 != NULL);
xfs_bmbt_set_all(&tr2, r2);
} else {
ASSERT(cnt == 1);
ASSERT(r2 == NULL);
}
xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
}
/*
* Add bmap trace entry after updating an extent list entry in place.
*/
STATIC void
xfs_bmap_trace_post_update(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry updated */
int whichfork) /* data or attr fork */
{
xfs_ifork_t *ifp; /* inode fork pointer */
ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
1, &ifp->if_u1.if_extents[idx], NULL, whichfork);
}
/*
* Add bmap trace entry prior to updating an extent list entry in place.
*/
STATIC void
xfs_bmap_trace_pre_update(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry to be updated */
int whichfork) /* data or attr fork */
{
xfs_ifork_t *ifp; /* inode fork pointer */
ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
&ifp->if_u1.if_extents[idx], NULL, whichfork);
}
#endif /* XFS_BMAP_TRACE */
/*
* Compute the worst-case number of indirect blocks that will be used
* for ip's delayed extent of length "len".
*/
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
xfs_inode_t *ip, /* incore inode pointer */
xfs_filblks_t len) /* delayed extent length */
{
int level; /* btree level number */
int maxrecs; /* maximum record count at this level */
xfs_mount_t *mp; /* mount structure */
xfs_filblks_t rval; /* return value */
mp = ip->i_mount;
maxrecs = mp->m_bmap_dmxr[0];
for (level = 0, rval = 0;
level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
level++) {
len += maxrecs - 1;
do_div(len, maxrecs);
rval += len;
if (len == 1)
return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
level - 1;
if (level == 0)
maxrecs = mp->m_bmap_dmxr[1];
}
return rval;
}
#if defined(XFS_RW_TRACE)
STATIC void
xfs_bunmap_trace(
xfs_inode_t *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
inst_t *ra)
{
if (ip->i_rwtrace == NULL)
return;
ktrace_enter(ip->i_rwtrace,
(void *)(__psint_t)XFS_BUNMAPI,
(void *)ip,
(void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
(void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
(void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
(void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
(void *)(__psint_t)len,
(void *)(__psint_t)flags,
(void *)(unsigned long)current_cpu(),
(void *)ra,
(void *)0,
(void *)0,
(void *)0,
(void *)0,
(void *)0,
(void *)0);
}
#endif
/*
* Convert inode from non-attributed to attributed.
* Must not be in a transaction, ip must not be locked.
*/
int /* error code */
xfs_bmap_add_attrfork(
xfs_inode_t *ip, /* incore inode pointer */
int size, /* space new attribute needs */
int rsvd) /* xact may use reserved blks */
{
xfs_fsblock_t firstblock; /* 1st block/ag allocated */
xfs_bmap_free_t flist; /* freed extent list */
xfs_mount_t *mp; /* mount structure */
xfs_trans_t *tp; /* transaction pointer */
unsigned long s; /* spinlock spl value */
int blks; /* space reservation */
int version = 1; /* superblock attr version */
int committed; /* xaction was committed */
int logflags; /* logging flags */
int error; /* error return value */
ASSERT(XFS_IFORK_Q(ip) == 0);
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
mp = ip->i_mount;
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
blks = XFS_ADDAFORK_SPACE_RES(mp);
if (rsvd)
tp->t_flags |= XFS_TRANS_RESERVE;
if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
goto error0;
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
XFS_QMOPT_RES_REGBLKS);
if (error) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
return error;
}
if (XFS_IFORK_Q(ip))
goto error1;
if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
/*
* For inodes coming from pre-6.2 filesystems.
*/
ASSERT(ip->i_d.di_aformat == 0);
ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
}
ASSERT(ip->i_d.di_anextents == 0);
VN_HOLD(XFS_ITOV(ip));
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_DEV:
ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
break;
case XFS_DINODE_FMT_UUID:
ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
break;
case XFS_DINODE_FMT_LOCAL:
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
if (!ip->i_d.di_forkoff)
ip->i_d.di_forkoff = mp->m_attroffset >> 3;
else if (mp->m_flags & XFS_MOUNT_ATTR2)
version = 2;
break;
default:
ASSERT(0);
error = XFS_ERROR(EINVAL);
goto error1;
}
ip->i_df.if_ext_max =
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(ip->i_afp == NULL);
ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
ip->i_afp->if_ext_max =
XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
ip->i_afp->if_flags = XFS_IFEXTENTS;
logflags = 0;
XFS_BMAP_INIT(&flist, &firstblock);
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_LOCAL:
error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
&logflags);
break;
case XFS_DINODE_FMT_EXTENTS:
error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
&flist, &logflags);
break;
case XFS_DINODE_FMT_BTREE:
error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
&logflags);
break;
default:
error = 0;
break;
}
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (error)
goto error2;
if (!XFS_SB_VERSION_HASATTR(&mp->m_sb) ||
(!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2)) {
__int64_t sbfields = 0;
s = XFS_SB_LOCK(mp);
if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
XFS_SB_VERSION_ADDATTR(&mp->m_sb);
sbfields |= XFS_SB_VERSIONNUM;
}
if (!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2) {
XFS_SB_VERSION_ADDATTR2(&mp->m_sb);
sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
}
if (sbfields) {
XFS_SB_UNLOCK(mp, s);
xfs_mod_sb(tp, sbfields);
} else
XFS_SB_UNLOCK(mp, s);
}
if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed)))
goto error2;
error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES, NULL);
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
return error;
error2:
xfs_bmap_cancel(&flist);
error1:
ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
xfs_iunlock(ip, XFS_ILOCK_EXCL);
error0:
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
return error;
}
/*
* Add the extent to the list of extents to be free at transaction end.
* The list is maintained sorted (by block number).
*/
/* ARGSUSED */
void
xfs_bmap_add_free(
xfs_fsblock_t bno, /* fs block number of extent */
xfs_filblks_t len, /* length of extent */
xfs_bmap_free_t *flist, /* list of extents */
xfs_mount_t *mp) /* mount point structure */
{
xfs_bmap_free_item_t *cur; /* current (next) element */
xfs_bmap_free_item_t *new; /* new element */
xfs_bmap_free_item_t *prev; /* previous element */
#ifdef DEBUG
xfs_agnumber_t agno;
xfs_agblock_t agbno;
ASSERT(bno != NULLFSBLOCK);
ASSERT(len > 0);
ASSERT(len <= MAXEXTLEN);
ASSERT(!ISNULLSTARTBLOCK(bno));
agno = XFS_FSB_TO_AGNO(mp, bno);
agbno = XFS_FSB_TO_AGBNO(mp, bno);
ASSERT(agno < mp->m_sb.sb_agcount);
ASSERT(agbno < mp->m_sb.sb_agblocks);
ASSERT(len < mp->m_sb.sb_agblocks);
ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
#endif
ASSERT(xfs_bmap_free_item_zone != NULL);
new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
new->xbfi_startblock = bno;
new->xbfi_blockcount = (xfs_extlen_t)len;
for (prev = NULL, cur = flist->xbf_first;
cur != NULL;
prev = cur, cur = cur->xbfi_next) {
if (cur->xbfi_startblock >= bno)
break;
}
if (prev)
prev->xbfi_next = new;
else
flist->xbf_first = new;
new->xbfi_next = cur;
flist->xbf_count++;
}
/*
* Compute and fill in the value of the maximum depth of a bmap btree
* in this filesystem. Done once, during mount.
*/
void
xfs_bmap_compute_maxlevels(
xfs_mount_t *mp, /* file system mount structure */
int whichfork) /* data or attr fork */
{
int level; /* btree level */
uint maxblocks; /* max blocks at this level */
uint maxleafents; /* max leaf entries possible */
int maxrootrecs; /* max records in root block */
int minleafrecs; /* min records in leaf block */
int minnoderecs; /* min records in node block */
int sz; /* root block size */
/*
* The maximum number of extents in a file, hence the maximum
* number of leaf entries, is controlled by the type of di_nextents
* (a signed 32-bit number, xfs_extnum_t), or by di_anextents
* (a signed 16-bit number, xfs_aextnum_t).
*/
if (whichfork == XFS_DATA_FORK) {
maxleafents = MAXEXTNUM;
sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
XFS_BMDR_SPACE_CALC(MINDBTPTRS) : mp->m_attroffset;
} else {
maxleafents = MAXAEXTNUM;
sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
XFS_BMDR_SPACE_CALC(MINABTPTRS) :
mp->m_sb.sb_inodesize - mp->m_attroffset;
}
maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
minleafrecs = mp->m_bmap_dmnr[0];
minnoderecs = mp->m_bmap_dmnr[1];
maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
for (level = 1; maxblocks > 1; level++) {
if (maxblocks <= maxrootrecs)
maxblocks = 1;
else
maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
}
mp->m_bm_maxlevels[whichfork] = level;
}
/*
* Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
* caller. Frees all the extents that need freeing, which must be done
* last due to locking considerations. We never free any extents in
* the first transaction. This is to allow the caller to make the first
* transaction a synchronous one so that the pointers to the data being
* broken in this transaction will be permanent before the data is actually
* freed. This is necessary to prevent blocks from being reallocated
* and written to before the free and reallocation are actually permanent.
* We do not just make the first transaction synchronous here, because
* there are more efficient ways to gain the same protection in some cases
* (see the file truncation code).
*
* Return 1 if the given transaction was committed and a new one
* started, and 0 otherwise in the committed parameter.
*/
/*ARGSUSED*/
int /* error */
xfs_bmap_finish(
xfs_trans_t **tp, /* transaction pointer addr */
xfs_bmap_free_t *flist, /* i/o: list extents to free */
xfs_fsblock_t firstblock, /* controlled ag for allocs */
int *committed) /* xact committed or not */
{
xfs_efd_log_item_t *efd; /* extent free data */
xfs_efi_log_item_t *efi; /* extent free intention */
int error; /* error return value */
xfs_bmap_free_item_t *free; /* free extent list item */
unsigned int logres; /* new log reservation */
unsigned int logcount; /* new log count */
xfs_mount_t *mp; /* filesystem mount structure */
xfs_bmap_free_item_t *next; /* next item on free list */
xfs_trans_t *ntp; /* new transaction pointer */
ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
if (flist->xbf_count == 0) {
*committed = 0;
return 0;
}
ntp = *tp;
efi = xfs_trans_get_efi(ntp, flist->xbf_count);
for (free = flist->xbf_first; free; free = free->xbfi_next)
xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
free->xbfi_blockcount);
logres = ntp->t_log_res;
logcount = ntp->t_log_count;
ntp = xfs_trans_dup(*tp);
error = xfs_trans_commit(*tp, 0, NULL);
*tp = ntp;
*committed = 1;
/*
* We have a new transaction, so we should return committed=1,
* even though we're returning an error.
*/
if (error) {
return error;
}
if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
logcount)))
return error;
efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
for (free = flist->xbf_first; free != NULL; free = next) {
next = free->xbfi_next;
if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
free->xbfi_blockcount))) {
/*
* The bmap free list will be cleaned up at a
* higher level. The EFI will be canceled when
* this transaction is aborted.
* Need to force shutdown here to make sure it
* happens, since this transaction may not be
* dirty yet.
*/
mp = ntp->t_mountp;
if (!XFS_FORCED_SHUTDOWN(mp))
xfs_force_shutdown(mp,
(error == EFSCORRUPTED) ?
XFS_CORRUPT_INCORE :
XFS_METADATA_IO_ERROR);
return error;
}
xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
free->xbfi_blockcount);
xfs_bmap_del_free(flist, NULL, free);
}
return 0;
}
/*
* Free up any items left in the list.
*/
void
xfs_bmap_cancel(
xfs_bmap_free_t *flist) /* list of bmap_free_items */
{
xfs_bmap_free_item_t *free; /* free list item */
xfs_bmap_free_item_t *next;
if (flist->xbf_count == 0)
return;
ASSERT(flist->xbf_first != NULL);
for (free = flist->xbf_first; free; free = next) {
next = free->xbfi_next;
xfs_bmap_del_free(flist, NULL, free);
}
ASSERT(flist->xbf_count == 0);
}
/*
* Returns the file-relative block number of the first unused block(s)
* in the file with at least "len" logically contiguous blocks free.
* This is the lowest-address hole if the file has holes, else the first block
* past the end of file.
* Return 0 if the file is currently local (in-inode).
*/
int /* error */
xfs_bmap_first_unused(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
xfs_extlen_t len, /* size of hole to find */
xfs_fileoff_t *first_unused, /* unused block */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *base; /* base of extent array */
xfs_bmbt_rec_t *ep; /* pointer to an extent entry */
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_fileoff_t lastaddr; /* last block number seen */
xfs_fileoff_t lowest; /* lowest useful block */
xfs_fileoff_t max; /* starting useful block */
xfs_fileoff_t off; /* offset for this block */
xfs_extnum_t nextents; /* number of extent entries */
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
*first_unused = 0;
return 0;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
lowest = *first_unused;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
base = &ifp->if_u1.if_extents[0];
for (lastaddr = 0, max = lowest, ep = base;
ep < &base[nextents];
ep++) {
off = xfs_bmbt_get_startoff(ep);
/*
* See if the hole before this extent will work.
*/
if (off >= lowest + len && off - max >= len) {
*first_unused = max;
return 0;
}
lastaddr = off + xfs_bmbt_get_blockcount(ep);
max = XFS_FILEOFF_MAX(lastaddr, lowest);
}
*first_unused = max;
return 0;
}
/*
* Returns the file-relative block number of the last block + 1 before
* last_block (input value) in the file.
* This is not based on i_size, it is based on the extent list.
* Returns 0 for local files, as they do not have an extent list.
*/
int /* error */
xfs_bmap_last_before(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
xfs_fileoff_t *last_block, /* last block */
int whichfork) /* data or attr fork */
{
xfs_fileoff_t bno; /* input file offset */
int eof; /* hit end of file */
xfs_bmbt_rec_t *ep; /* pointer to last extent */
int error; /* error return value */
xfs_bmbt_irec_t got; /* current extent value */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t lastx; /* last extent used */
xfs_bmbt_irec_t prev; /* previous extent value */
if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
return XFS_ERROR(EIO);
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
*last_block = 0;
return 0;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
bno = *last_block - 1;
ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
&prev);
if (eof || xfs_bmbt_get_startoff(ep) > bno) {
if (prev.br_startoff == NULLFILEOFF)
*last_block = 0;
else
*last_block = prev.br_startoff + prev.br_blockcount;
}
/*
* Otherwise *last_block is already the right answer.
*/
return 0;
}
/*
* Returns the file-relative block number of the first block past eof in
* the file. This is not based on i_size, it is based on the extent list.
* Returns 0 for local files, as they do not have an extent list.
*/
int /* error */
xfs_bmap_last_offset(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
xfs_fileoff_t *last_block, /* last block */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *base; /* base of extent array */
xfs_bmbt_rec_t *ep; /* pointer to last extent */
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* number of extent entries */
if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
return XFS_ERROR(EIO);
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
*last_block = 0;
return 0;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (!nextents) {
*last_block = 0;
return 0;
}
base = &ifp->if_u1.if_extents[0];
ASSERT(base != NULL);
ep = &base[nextents - 1];
*last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
return 0;
}
/*
* Returns whether the selected fork of the inode has exactly one
* block or not. For the data fork we check this matches di_size,
* implying the file's range is 0..bsize-1.
*/
int /* 1=>1 block, 0=>otherwise */
xfs_bmap_one_block(
xfs_inode_t *ip, /* incore inode */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *ep; /* ptr to fork's extent */
xfs_ifork_t *ifp; /* inode fork pointer */
int rval; /* return value */
xfs_bmbt_irec_t s; /* internal version of extent */
#ifndef DEBUG
if (whichfork == XFS_DATA_FORK)
return ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize;
#endif /* !DEBUG */
if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
return 0;
if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
return 0;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
ep = ifp->if_u1.if_extents;
xfs_bmbt_get_all(ep, &s);
rval = s.br_startoff == 0 && s.br_blockcount == 1;
if (rval && whichfork == XFS_DATA_FORK)
ASSERT(ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
return rval;
}
/*
* Read in the extents to if_extents.
* All inode fields are set up by caller, we just traverse the btree
* and copy the records in. If the file system cannot contain unwritten
* extents, the records are checked for no "state" flags.
*/
int /* error */
xfs_bmap_read_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
int whichfork) /* data or attr fork */
{
xfs_bmbt_block_t *block; /* current btree block */
xfs_fsblock_t bno; /* block # of "block" */
xfs_buf_t *bp; /* buffer for "block" */
int error; /* error return value */
xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_read_extents";
#endif
xfs_extnum_t i, j; /* index into the extents list */
xfs_ifork_t *ifp; /* fork structure */
int level; /* btree level, for checking */
xfs_mount_t *mp; /* file system mount structure */
xfs_bmbt_ptr_t *pp; /* pointer to block address */
/* REFERENCED */
xfs_extnum_t room; /* number of entries there's room for */
xfs_bmbt_rec_t *trp; /* target record pointer */
bno = NULLFSBLOCK;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
XFS_EXTFMT_INODE(ip);
block = ifp->if_broot;
/*
* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
*/
level = be16_to_cpu(block->bb_level);
ASSERT(level > 0);
pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
bno = INT_GET(*pp, ARCH_CONVERT);
/*
* Go down the tree until leaf level is reached, following the first
* pointer (leftmost) at each level.
*/
while (level-- > 0) {
if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
XFS_BMAP_BTREE_REF)))
return error;
block = XFS_BUF_TO_BMBT_BLOCK(bp);
XFS_WANT_CORRUPTED_GOTO(
XFS_BMAP_SANITY_CHECK(mp, block, level),
error0);
if (level == 0)
break;
pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
1, mp->m_bmap_dmxr[1]);
XFS_WANT_CORRUPTED_GOTO(
XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)),
error0);
bno = INT_GET(*pp, ARCH_CONVERT);
xfs_trans_brelse(tp, bp);
}
/*
* Here with bp and block set to the leftmost leaf node in the tree.
*/
room = ifp->if_bytes / (uint)sizeof(*trp);
trp = ifp->if_u1.if_extents;
i = 0;
/*
* Loop over all leaf nodes. Copy information to the extent list.
*/
for (;;) {
xfs_bmbt_rec_t *frp, *temp;
xfs_fsblock_t nextbno;
xfs_extnum_t num_recs;
num_recs = be16_to_cpu(block->bb_numrecs);
if (unlikely(i + num_recs > room)) {
ASSERT(i + num_recs <= room);
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt dinode %Lu, (btree extents).",
(unsigned long long) ip->i_ino);
XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
XFS_ERRLEVEL_LOW,
ip->i_mount);
goto error0;
}
XFS_WANT_CORRUPTED_GOTO(
XFS_BMAP_SANITY_CHECK(mp, block, 0),
error0);
/*
* Read-ahead the next leaf block, if any.
*/
nextbno = be64_to_cpu(block->bb_rightsib);
if (nextbno != NULLFSBLOCK)
xfs_btree_reada_bufl(mp, nextbno, 1);
/*
* Copy records into the extent list.
*/
frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
block, 1, mp->m_bmap_dmxr[0]);
temp = trp;
for (j = 0; j < num_recs; j++, frp++, trp++) {
trp->l0 = INT_GET(frp->l0, ARCH_CONVERT);
trp->l1 = INT_GET(frp->l1, ARCH_CONVERT);
}
if (exntf == XFS_EXTFMT_NOSTATE) {
/*
* Check all attribute bmap btree records and
* any "older" data bmap btree records for a
* set bit in the "extent flag" position.
*/
if (unlikely(xfs_check_nostate_extents(temp, num_recs))) {
XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
XFS_ERRLEVEL_LOW,
ip->i_mount);
goto error0;
}
}
i += num_recs;
xfs_trans_brelse(tp, bp);
bno = nextbno;
/*
* If we've reached the end, stop.
*/
if (bno == NULLFSBLOCK)
break;
if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
XFS_BMAP_BTREE_REF)))
return error;
block = XFS_BUF_TO_BMBT_BLOCK(bp);
}
ASSERT(i == ifp->if_bytes / (uint)sizeof(*trp));
ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
xfs_bmap_trace_exlist(fname, ip, i, whichfork);
return 0;
error0:
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EFSCORRUPTED);
}
#ifdef XFS_BMAP_TRACE
/*
* Add bmap trace insert entries for all the contents of the extent list.
*/
void
xfs_bmap_trace_exlist(
char *fname, /* function name */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t cnt, /* count of entries in the list */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *base; /* base of extent list */
xfs_bmbt_rec_t *ep; /* current entry in extent list */
xfs_extnum_t idx; /* extent list entry number */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_irec_t s; /* extent list record */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(cnt == ifp->if_bytes / (uint)sizeof(*base));
base = ifp->if_u1.if_extents;
for (idx = 0, ep = base; idx < cnt; idx++, ep++) {
xfs_bmbt_get_all(ep, &s);
xfs_bmap_trace_insert(fname, "exlist", ip, idx, 1, &s, NULL,
whichfork);
}
}
#endif
#ifdef DEBUG
/*
* Validate that the bmbt_irecs being returned from bmapi are valid
* given the callers original parameters. Specifically check the
* ranges of the returned irecs to ensure that they only extent beyond
* the given parameters if the XFS_BMAPI_ENTIRE flag was set.
*/
STATIC void
xfs_bmap_validate_ret(
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
xfs_bmbt_irec_t *mval,
int nmap,
int ret_nmap)
{
int i; /* index to map values */
ASSERT(ret_nmap <= nmap);
for (i = 0; i < ret_nmap; i++) {
ASSERT(mval[i].br_blockcount > 0);
if (!(flags & XFS_BMAPI_ENTIRE)) {
ASSERT(mval[i].br_startoff >= bno);
ASSERT(mval[i].br_blockcount <= len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
bno + len);
} else {
ASSERT(mval[i].br_startoff < bno + len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
bno);
}
ASSERT(i == 0 ||
mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
mval[i].br_startoff);
if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
mval[i].br_startblock != HOLESTARTBLOCK);
ASSERT(mval[i].br_state == XFS_EXT_NORM ||
mval[i].br_state == XFS_EXT_UNWRITTEN);
}
}
#endif /* DEBUG */
/*
* Map file blocks to filesystem blocks.
* File range is given by the bno/len pair.
* Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
* into a hole or past eof.
* Only allocates blocks from a single allocation group,
* to avoid locking problems.
* The returned value in "firstblock" from the first call in a transaction
* must be remembered and presented to subsequent calls in "firstblock".
* An upper bound for the number of blocks to be allocated is supplied to
* the first call in "total"; if no allocation group has that many free
* blocks then the call will fail (return NULLFSBLOCK in "firstblock").
*/
int /* error */
xfs_bmapi(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
xfs_fileoff_t bno, /* starting file offs. mapped */
xfs_filblks_t len, /* length to map in file */
int flags, /* XFS_BMAPI_... */
xfs_fsblock_t *firstblock, /* first allocated block
controls a.g. for allocs */
xfs_extlen_t total, /* total blocks needed */
xfs_bmbt_irec_t *mval, /* output: map values */
int *nmap, /* i/o: mval size/count */
xfs_bmap_free_t *flist) /* i/o: list extents to free */
{
xfs_fsblock_t abno; /* allocated block number */
xfs_extlen_t alen; /* allocated extent length */
xfs_fileoff_t aoff; /* allocated file offset */
xfs_bmalloca_t bma; /* args for xfs_bmap_alloc */
xfs_btree_cur_t *cur; /* bmap btree cursor */
xfs_fileoff_t end; /* end of mapped file region */
int eof; /* we've hit the end of extent list */
char contig; /* allocation must be one extent */
char delay; /* this request is for delayed alloc */
char exact; /* don't do all of wasdelayed extent */
char convert; /* unwritten extent I/O completion */
xfs_bmbt_rec_t *ep; /* extent list entry pointer */
int error; /* error return */
xfs_bmbt_irec_t got; /* current extent list record */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extlen_t indlen; /* indirect blocks length */
xfs_extnum_t lastx; /* last useful extent number */
int logflags; /* flags for transaction logging */
xfs_extlen_t minleft; /* min blocks left after allocation */
xfs_extlen_t minlen; /* min allocation size */
xfs_mount_t *mp; /* xfs mount structure */
int n; /* current extent index */
int nallocs; /* number of extents alloc\'d */
xfs_extnum_t nextents; /* number of extents in file */
xfs_fileoff_t obno; /* old block number (offset) */
xfs_bmbt_irec_t prev; /* previous extent list record */
int tmp_logflags; /* temp flags holder */
int whichfork; /* data or attr fork */
char inhole; /* current location is hole in file */
char stateless; /* ignore state flag set */
char trim; /* output trimmed to match range */
char userdata; /* allocating non-metadata */
char wasdelay; /* old extent was delayed */
char wr; /* this is a write request */
char rt; /* this is a realtime file */
char rsvd; /* OK to allocate reserved blocks */
#ifdef DEBUG
xfs_fileoff_t orig_bno; /* original block number value */
int orig_flags; /* original flags arg value */
xfs_filblks_t orig_len; /* original value of len arg */
xfs_bmbt_irec_t *orig_mval; /* original value of mval */
int orig_nmap; /* original value of *nmap */
orig_bno = bno;
orig_len = len;
orig_flags = flags;
orig_mval = mval;
orig_nmap = *nmap;
#endif
ASSERT(*nmap >= 1);
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
mp = ip->i_mount;
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
XFS_STATS_INC(xs_blk_mapw);
else
XFS_STATS_INC(xs_blk_mapr);
delay = (flags & XFS_BMAPI_DELAY) != 0;
trim = (flags & XFS_BMAPI_ENTIRE) == 0;
userdata = (flags & XFS_BMAPI_METADATA) == 0;
convert = (flags & XFS_BMAPI_CONVERT) != 0;
exact = (flags & XFS_BMAPI_EXACT) != 0;
rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
contig = (flags & XFS_BMAPI_CONTIG) != 0;
/*
* stateless is used to combine extents which
* differ only due to the state of the extents.
* This technique is used from xfs_getbmap()
* when the caller does not wish to see the
* separation (which is the default).
*
* This technique is also used when writing a
* buffer which has been partially written,
* (usually by being flushed during a chunkread),
* to ensure one write takes place. This also
* prevents a change in the xfs inode extents at
* this time, intentionally. This change occurs
* on completion of the write operation, in
* xfs_strat_comp(), where the xfs_bmapi() call
* is transactioned, and the extents combined.
*/
stateless = (flags & XFS_BMAPI_IGSTATE) != 0;
if (stateless && wr) /* if writing unwritten space, no */
wr = 0; /* allocations are allowed */
ASSERT(wr || !delay);
logflags = 0;
nallocs = 0;
cur = NULL;
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
ASSERT(wr && tp);
if ((error = xfs_bmap_local_to_extents(tp, ip,
firstblock, total, &logflags, whichfork)))
goto error0;
}
if (wr && *firstblock == NULLFSBLOCK) {
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
else
minleft = 1;
} else
minleft = 0;
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
goto error0;
ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
&prev);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
n = 0;
end = bno + len;
obno = bno;
bma.ip = NULL;
while (bno < end && n < *nmap) {
/*
* Reading past eof, act as though there's a hole
* up to end.
*/
if (eof && !wr)
got.br_startoff = end;
inhole = eof || got.br_startoff > bno;
wasdelay = wr && !inhole && !delay &&
ISNULLSTARTBLOCK(got.br_startblock);
/*
* First, deal with the hole before the allocated space
* that we found, if any.
*/
if (wr && (inhole || wasdelay)) {
/*
* For the wasdelay case, we could also just
* allocate the stuff asked for in this bmap call
* but that wouldn't be as good.
*/
if (wasdelay && !exact) {
alen = (xfs_extlen_t)got.br_blockcount;
aoff = got.br_startoff;
if (lastx != NULLEXTNUM && lastx) {
ep = &ifp->if_u1.if_extents[lastx - 1];
xfs_bmbt_get_all(ep, &prev);
}
} else if (wasdelay) {
alen = (xfs_extlen_t)
XFS_FILBLKS_MIN(len,
(got.br_startoff +
got.br_blockcount) - bno);
aoff = bno;
} else {
alen = (xfs_extlen_t)
XFS_FILBLKS_MIN(len, MAXEXTLEN);
if (!eof)
alen = (xfs_extlen_t)
XFS_FILBLKS_MIN(alen,
got.br_startoff - bno);
aoff = bno;
}
minlen = contig ? alen : 1;
if (delay) {
xfs_extlen_t extsz;
/* Figure out the extent size, adjust alen */
if (rt) {
if (!(extsz = ip->i_d.di_extsize))
extsz = mp->m_sb.sb_rextsize;
} else {
extsz = ip->i_d.di_extsize;
}
if (extsz) {
error = xfs_bmap_extsize_align(mp,
&got, &prev, extsz,
rt, eof, delay, convert,
&aoff, &alen);
ASSERT(!error);
}
if (rt)
extsz = alen / mp->m_sb.sb_rextsize;
/*
* Make a transaction-less quota reservation for
* delayed allocation blocks. This number gets
* adjusted later.
* We return EDQUOT if we haven't allocated
* blks already inside this loop;
*/
if (XFS_TRANS_RESERVE_QUOTA_NBLKS(
mp, NULL, ip, (long)alen, 0,
rt ? XFS_QMOPT_RES_RTBLKS :
XFS_QMOPT_RES_REGBLKS)) {
if (n == 0) {
*nmap = 0;
ASSERT(cur == NULL);
return XFS_ERROR(EDQUOT);
}
break;
}
/*
* Split changing sb for alen and indlen since
* they could be coming from different places.
*/
indlen = (xfs_extlen_t)
xfs_bmap_worst_indlen(ip, alen);
ASSERT(indlen > 0);
if (rt) {
error = xfs_mod_incore_sb(mp,
XFS_SBS_FREXTENTS,
-(extsz), rsvd);
} else {
error = xfs_mod_incore_sb(mp,
XFS_SBS_FDBLOCKS,
-(alen), rsvd);
}
if (!error) {
error = xfs_mod_incore_sb(mp,
XFS_SBS_FDBLOCKS,
-(indlen), rsvd);
if (error && rt)
xfs_mod_incore_sb(mp,
XFS_SBS_FREXTENTS,
extsz, rsvd);
else if (error)
xfs_mod_incore_sb(mp,
XFS_SBS_FDBLOCKS,
alen, rsvd);
}
if (error) {
if (XFS_IS_QUOTA_ON(mp))
/* unreserve the blocks now */
(void)
XFS_TRANS_UNRESERVE_QUOTA_NBLKS(
mp, NULL, ip,
(long)alen, 0, rt ?
XFS_QMOPT_RES_RTBLKS :
XFS_QMOPT_RES_REGBLKS);
break;
}
ip->i_delayed_blks += alen;
abno = NULLSTARTBLOCK(indlen);
} else {
/*
* If first time, allocate and fill in
* once-only bma fields.
*/
if (bma.ip == NULL) {
bma.tp = tp;
bma.ip = ip;
bma.prevp = &prev;
bma.gotp = &got;
bma.total = total;
bma.userdata = 0;
}
/* Indicate if this is the first user data
* in the file, or just any user data.
*/
if (userdata) {
bma.userdata = (aoff == 0) ?
XFS_ALLOC_INITIAL_USER_DATA :
XFS_ALLOC_USERDATA;
}
/*
* Fill in changeable bma fields.
*/
bma.eof = eof;
bma.firstblock = *firstblock;
bma.alen = alen;
bma.off = aoff;
bma.conv = convert;
bma.wasdel = wasdelay;
bma.minlen = minlen;
bma.low = flist->xbf_low;
bma.minleft = minleft;
/*
* Only want to do the alignment at the
* eof if it is userdata and allocation length
* is larger than a stripe unit.
*/
if (mp->m_dalign && alen >= mp->m_dalign &&
userdata && whichfork == XFS_DATA_FORK) {
if ((error = xfs_bmap_isaeof(ip, aoff,
whichfork, &bma.aeof)))
goto error0;
} else
bma.aeof = 0;
/*
* Call allocator.
*/
if ((error = xfs_bmap_alloc(&bma)))
goto error0;
/*
* Copy out result fields.
*/
abno = bma.rval;
if ((flist->xbf_low = bma.low))
minleft = 0;
alen = bma.alen;
aoff = bma.off;
ASSERT(*firstblock == NULLFSBLOCK ||
XFS_FSB_TO_AGNO(mp, *firstblock) ==
XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
(flist->xbf_low &&
XFS_FSB_TO_AGNO(mp, *firstblock) <
XFS_FSB_TO_AGNO(mp, bma.firstblock)));
*firstblock = bma.firstblock;
if (cur)
cur->bc_private.b.firstblock =
*firstblock;
if (abno == NULLFSBLOCK)
break;
if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
cur = xfs_btree_init_cursor(mp,
tp, NULL, 0, XFS_BTNUM_BMAP,
ip, whichfork);
cur->bc_private.b.firstblock =
*firstblock;
cur->bc_private.b.flist = flist;
}
/*
* Bump the number of extents we've allocated
* in this call.
*/
nallocs++;
}
if (cur)
cur->bc_private.b.flags =
wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
got.br_startoff = aoff;
got.br_startblock = abno;
got.br_blockcount = alen;
got.br_state = XFS_EXT_NORM; /* assume normal */
/*
* Determine state of extent, and the filesystem.
* A wasdelay extent has been initialized, so
* shouldn't be flagged as unwritten.
*/
if (wr && XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
got.br_state = XFS_EXT_UNWRITTEN;
}
error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
firstblock, flist, &tmp_logflags, whichfork,
rsvd);
logflags |= tmp_logflags;
if (error)
goto error0;
lastx = ifp->if_lastex;
ep = &ifp->if_u1.if_extents[lastx];
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
xfs_bmbt_get_all(ep, &got);
ASSERT(got.br_startoff <= aoff);
ASSERT(got.br_startoff + got.br_blockcount >=
aoff + alen);
#ifdef DEBUG
if (delay) {
ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
}
ASSERT(got.br_state == XFS_EXT_NORM ||
got.br_state == XFS_EXT_UNWRITTEN);
#endif
/*
* Fall down into the found allocated space case.
*/
} else if (inhole) {
/*
* Reading in a hole.
*/
mval->br_startoff = bno;
mval->br_startblock = HOLESTARTBLOCK;
mval->br_blockcount =
XFS_FILBLKS_MIN(len, got.br_startoff - bno);
mval->br_state = XFS_EXT_NORM;
bno += mval->br_blockcount;
len -= mval->br_blockcount;
mval++;
n++;
continue;
}
/*
* Then deal with the allocated space we found.
*/
ASSERT(ep != NULL);
if (trim && (got.br_startoff + got.br_blockcount > obno)) {
if (obno > bno)
bno = obno;
ASSERT((bno >= obno) || (n == 0));
ASSERT(bno < end);
mval->br_startoff = bno;
if (ISNULLSTARTBLOCK(got.br_startblock)) {
ASSERT(!wr || delay);
mval->br_startblock = DELAYSTARTBLOCK;
} else
mval->br_startblock =
got.br_startblock +
(bno - got.br_startoff);
/*
* Return the minimum of what we got and what we
* asked for for the length. We can use the len
* variable here because it is modified below
* and we could have been there before coming
* here if the first part of the allocation
* didn't overlap what was asked for.
*/
mval->br_blockcount =
XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
(bno - got.br_startoff));
mval->br_state = got.br_state;
ASSERT(mval->br_blockcount <= len);
} else {
*mval = got;
if (ISNULLSTARTBLOCK(mval->br_startblock)) {
ASSERT(!wr || delay);
mval->br_startblock = DELAYSTARTBLOCK;
}
}
/*
* Check if writing previously allocated but
* unwritten extents.
*/
if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
/*
* Modify (by adding) the state flag, if writing.
*/
ASSERT(mval->br_blockcount <= len);
if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
cur = xfs_btree_init_cursor(mp,
tp, NULL, 0, XFS_BTNUM_BMAP,
ip, whichfork);
cur->bc_private.b.firstblock =
*firstblock;
cur->bc_private.b.flist = flist;
}
mval->br_state = XFS_EXT_NORM;
error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
firstblock, flist, &tmp_logflags, whichfork,
rsvd);
logflags |= tmp_logflags;
if (error)
goto error0;
lastx = ifp->if_lastex;
ep = &ifp->if_u1.if_extents[lastx];
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
xfs_bmbt_get_all(ep, &got);
/*
* We may have combined previously unwritten
* space with written space, so generate
* another request.
*/
if (mval->br_blockcount < len)
continue;
}
ASSERT(!trim ||
((mval->br_startoff + mval->br_blockcount) <= end));
ASSERT(!trim || (mval->br_blockcount <= len) ||
(mval->br_startoff < obno));
bno = mval->br_startoff + mval->br_blockcount;
len = end - bno;
if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
ASSERT(mval->br_startblock == mval[-1].br_startblock);
ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
ASSERT(mval->br_state == mval[-1].br_state);
mval[-1].br_blockcount = mval->br_blockcount;
mval[-1].br_state = mval->br_state;
} else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
mval[-1].br_startblock != DELAYSTARTBLOCK &&
mval[-1].br_startblock != HOLESTARTBLOCK &&
mval->br_startblock ==
mval[-1].br_startblock + mval[-1].br_blockcount &&
(stateless || mval[-1].br_state == mval->br_state)) {
ASSERT(mval->br_startoff ==
mval[-1].br_startoff + mval[-1].br_blockcount);
mval[-1].br_blockcount += mval->br_blockcount;
} else if (n > 0 &&
mval->br_startblock == DELAYSTARTBLOCK &&
mval[-1].br_startblock == DELAYSTARTBLOCK &&
mval->br_startoff ==
mval[-1].br_startoff + mval[-1].br_blockcount) {
mval[-1].br_blockcount += mval->br_blockcount;
mval[-1].br_state = mval->br_state;
} else if (!((n == 0) &&
((mval->br_startoff + mval->br_blockcount) <=
obno))) {
mval++;
n++;
}
/*
* If we're done, stop now. Stop when we've allocated
* XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
* the transaction may get too big.
*/
if (bno >= end || n >= *nmap || nallocs >= *nmap)
break;
/*
* Else go on to the next record.
*/
ep++;
lastx++;
if (lastx >= nextents) {
eof = 1;
prev = got;
} else
xfs_bmbt_get_all(ep, &got);
}
ifp->if_lastex = lastx;
*nmap = n;
/*
* Transform from btree to extents, give it cur.
*/
if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
ASSERT(wr && cur);
error = xfs_bmap_btree_to_extents(tp, ip, cur,
&tmp_logflags, whichfork);
logflags |= tmp_logflags;
if (error)
goto error0;
}
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
error = 0;
error0:
/*
* Log everything. Do this after conversion, there's no point in
* logging the extent list if we've converted to btree format.
*/
if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
logflags &= ~XFS_ILOG_FEXT(whichfork);
else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
logflags &= ~XFS_ILOG_FBROOT(whichfork);
/*
* Log whatever the flags say, even if error. Otherwise we might miss
* detecting a case where the data is changed, there's an error,
* and it's not logged so we don't shutdown when we should.
*/
if (logflags) {
ASSERT(tp && wr);
xfs_trans_log_inode(tp, ip, logflags);
}
if (cur) {
if (!error) {
ASSERT(*firstblock == NULLFSBLOCK ||
XFS_FSB_TO_AGNO(mp, *firstblock) ==
XFS_FSB_TO_AGNO(mp,
cur->bc_private.b.firstblock) ||
(flist->xbf_low &&
XFS_FSB_TO_AGNO(mp, *firstblock) <
XFS_FSB_TO_AGNO(mp,
cur->bc_private.b.firstblock)));
*firstblock = cur->bc_private.b.firstblock;
}
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
if (!error)
xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
orig_nmap, *nmap);
return error;
}
/*
* Map file blocks to filesystem blocks, simple version.
* One block (extent) only, read-only.
* For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
* For the other flag values, the effect is as if XFS_BMAPI_METADATA
* was set and all the others were clear.
*/
int /* error */
xfs_bmapi_single(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
int whichfork, /* data or attr fork */
xfs_fsblock_t *fsb, /* output: mapped block */
xfs_fileoff_t bno) /* starting file offs. mapped */
{
int eof; /* we've hit the end of extent list */
int error; /* error return */
xfs_bmbt_irec_t got; /* current extent list record */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t lastx; /* last useful extent number */
xfs_bmbt_irec_t prev; /* previous extent list record */
ifp = XFS_IFORK_PTR(ip, whichfork);
if (unlikely(
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return XFS_ERROR(EIO);
XFS_STATS_INC(xs_blk_mapr);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
(void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
&prev);
/*
* Reading past eof, act as though there's a hole
* up to end.
*/
if (eof || got.br_startoff > bno) {
*fsb = NULLFSBLOCK;
return 0;
}
ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
ASSERT(bno < got.br_startoff + got.br_blockcount);
*fsb = got.br_startblock + (bno - got.br_startoff);
ifp->if_lastex = lastx;
return 0;
}
/*
* Unmap (remove) blocks from a file.
* If nexts is nonzero then the number of extents to remove is limited to
* that value. If not all extents in the block range can be removed then
* *done is set.
*/
int /* error */
xfs_bunmapi(
xfs_trans_t *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t bno, /* starting offset to unmap */
xfs_filblks_t len, /* length to unmap in file */
int flags, /* misc flags */
xfs_extnum_t nexts, /* number of extents max */
xfs_fsblock_t *firstblock, /* first allocated block
controls a.g. for allocs */
xfs_bmap_free_t *flist, /* i/o: list extents to free */
int *done) /* set if not done yet */
{
xfs_btree_cur_t *cur; /* bmap btree cursor */
xfs_bmbt_irec_t del; /* extent being deleted */
int eof; /* is deleting at eof */
xfs_bmbt_rec_t *ep; /* extent list entry pointer */
int error; /* error return value */
xfs_extnum_t extno; /* extent number in list */
xfs_bmbt_irec_t got; /* current extent list entry */
xfs_ifork_t *ifp; /* inode fork pointer */
int isrt; /* freeing in rt area */
xfs_extnum_t lastx; /* last extent index used */
int logflags; /* transaction logging flags */
xfs_extlen_t mod; /* rt extent offset */
xfs_mount_t *mp; /* mount structure */
xfs_extnum_t nextents; /* size of extent list */
xfs_bmbt_irec_t prev; /* previous extent list entry */
xfs_fileoff_t start; /* first file offset deleted */
int tmp_logflags; /* partial logging flags */
int wasdel; /* was a delayed alloc extent */
int whichfork; /* data or attribute fork */
int rsvd; /* OK to allocate reserved blocks */
xfs_fsblock_t sum;
xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
ifp = XFS_IFORK_PTR(ip, whichfork);
if (unlikely(
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
mp = ip->i_mount;
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
ASSERT(len > 0);
ASSERT(nexts >= 0);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (nextents == 0) {
*done = 1;
return 0;
}
XFS_STATS_INC(xs_blk_unmap);
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
start = bno;
bno = start + len - 1;
ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
&prev);
/*
* Check to see if the given block number is past the end of the
* file, back up to the last block if so...
*/
if (eof) {
ep = &ifp->if_u1.if_extents[--lastx];
xfs_bmbt_get_all(ep, &got);
bno = got.br_startoff + got.br_blockcount - 1;
}
logflags = 0;
if (ifp->if_flags & XFS_IFBROOT) {
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
whichfork);
cur->bc_private.b.firstblock = *firstblock;
cur->bc_private.b.flist = flist;
cur->bc_private.b.flags = 0;
} else
cur = NULL;
extno = 0;
while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
(nexts == 0 || extno < nexts)) {
/*
* Is the found extent after a hole in which bno lives?
* Just back up to the previous extent, if so.
*/
if (got.br_startoff > bno) {
if (--lastx < 0)
break;
ep--;
xfs_bmbt_get_all(ep, &got);
}
/*
* Is the last block of this extent before the range
* we're supposed to delete? If so, we're done.
*/
bno = XFS_FILEOFF_MIN(bno,
got.br_startoff + got.br_blockcount - 1);
if (bno < start)
break;
/*
* Then deal with the (possibly delayed) allocated space
* we found.
*/
ASSERT(ep != NULL);
del = got;
wasdel = ISNULLSTARTBLOCK(del.br_startblock);
if (got.br_startoff < start) {
del.br_startoff = start;
del.br_blockcount -= start - got.br_startoff;
if (!wasdel)
del.br_startblock += start - got.br_startoff;
}
if (del.br_startoff + del.br_blockcount > bno + 1)
del.br_blockcount = bno + 1 - del.br_startoff;
sum = del.br_startblock + del.br_blockcount;
if (isrt &&
(mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
/*
* Realtime extent not lined up at the end.
* The extent could have been split into written
* and unwritten pieces, or we could just be
* unmapping part of it. But we can't really
* get rid of part of a realtime extent.
*/
if (del.br_state == XFS_EXT_UNWRITTEN ||
!XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
/*
* This piece is unwritten, or we're not
* using unwritten extents. Skip over it.
*/
ASSERT(bno >= mod);
bno -= mod > del.br_blockcount ?
del.br_blockcount : mod;
if (bno < got.br_startoff) {
if (--lastx >= 0)
xfs_bmbt_get_all(--ep, &got);
}
continue;
}
/*
* It's written, turn it unwritten.
* This is better than zeroing it.
*/
ASSERT(del.br_state == XFS_EXT_NORM);
ASSERT(xfs_trans_get_block_res(tp) > 0);
/*
* If this spans a realtime extent boundary,
* chop it back to the start of the one we end at.
*/
if (del.br_blockcount > mod) {
del.br_startoff += del.br_blockcount - mod;
del.br_startblock += del.br_blockcount - mod;
del.br_blockcount = mod;
}
del.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
firstblock, flist, &logflags, XFS_DATA_FORK, 0);
if (error)
goto error0;
goto nodelete;
}
if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
/*
* Realtime extent is lined up at the end but not
* at the front. We'll get rid of full extents if
* we can.
*/
mod = mp->m_sb.sb_rextsize - mod;
if (del.br_blockcount > mod) {
del.br_blockcount -= mod;
del.br_startoff += mod;
del.br_startblock += mod;
} else if ((del.br_startoff == start &&
(del.br_state == XFS_EXT_UNWRITTEN ||
xfs_trans_get_block_res(tp) == 0)) ||
!XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
/*
* Can't make it unwritten. There isn't
* a full extent here so just skip it.
*/
ASSERT(bno >= del.br_blockcount);
bno -= del.br_blockcount;
if (bno < got.br_startoff) {
if (--lastx >= 0)
xfs_bmbt_get_all(--ep, &got);
}
continue;
} else if (del.br_state == XFS_EXT_UNWRITTEN) {
/*
* This one is already unwritten.
* It must have a written left neighbor.
* Unwrite the killed part of that one and
* try again.
*/
ASSERT(lastx > 0);
xfs_bmbt_get_all(ep - 1, &prev);
ASSERT(prev.br_state == XFS_EXT_NORM);
ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
ASSERT(del.br_startblock ==
prev.br_startblock + prev.br_blockcount);
if (prev.br_startoff < start) {
mod = start - prev.br_startoff;
prev.br_blockcount -= mod;
prev.br_startblock += mod;
prev.br_startoff = start;
}
prev.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
&prev, firstblock, flist, &logflags,
XFS_DATA_FORK, 0);
if (error)
goto error0;
goto nodelete;
} else {
ASSERT(del.br_state == XFS_EXT_NORM);
del.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent(ip, lastx, &cur,
&del, firstblock, flist, &logflags,
XFS_DATA_FORK, 0);
if (error)
goto error0;
goto nodelete;
}
}
if (wasdel) {
ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
/* Update realtime/data freespace, unreserve quota */
if (isrt) {
xfs_filblks_t rtexts;
rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
do_div(rtexts, mp->m_sb.sb_rextsize);
xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
(int)rtexts, rsvd);
(void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
NULL, ip, -((long)del.br_blockcount), 0,
XFS_QMOPT_RES_RTBLKS);
} else {
xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
(int)del.br_blockcount, rsvd);
(void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
NULL, ip, -((long)del.br_blockcount), 0,
XFS_QMOPT_RES_REGBLKS);
}
ip->i_delayed_blks -= del.br_blockcount;
if (cur)
cur->bc_private.b.flags |=
XFS_BTCUR_BPRV_WASDEL;
} else if (cur)
cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
/*
* If it's the case where the directory code is running
* with no block reservation, and the deleted block is in
* the middle of its extent, and the resulting insert
* of an extent would cause transformation to btree format,
* then reject it. The calling code will then swap
* blocks around instead.
* We have to do this now, rather than waiting for the
* conversion to btree format, since the transaction
* will be dirty.
*/
if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
del.br_startoff > got.br_startoff &&
del.br_startoff + del.br_blockcount <
got.br_startoff + got.br_blockcount) {
error = XFS_ERROR(ENOSPC);
goto error0;
}
error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
&tmp_logflags, whichfork, rsvd);
logflags |= tmp_logflags;
if (error)
goto error0;
bno = del.br_startoff - 1;
nodelete:
lastx = ifp->if_lastex;
/*
* If not done go on to the next (previous) record.
* Reset ep in case the extents array was re-alloced.
*/
ep = &ifp->if_u1.if_extents[lastx];
if (bno != (xfs_fileoff_t)-1 && bno >= start) {
if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
xfs_bmbt_get_startoff(ep) > bno) {
lastx--;
ep--;
}
if (lastx >= 0)
xfs_bmbt_get_all(ep, &got);
extno++;
}
}
ifp->if_lastex = lastx;
*done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
/*
* Convert to a btree if necessary.
*/
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
&cur, 0, &tmp_logflags, whichfork);
logflags |= tmp_logflags;
if (error)
goto error0;
}
/*
* transform from btree to extents, give it cur
*/
else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
ASSERT(cur != NULL);
error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
whichfork);
logflags |= tmp_logflags;
if (error)
goto error0;
}
/*
* transform from extents to local?
*/
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
error = 0;
error0:
/*
* Log everything. Do this after conversion, there's no point in
* logging the extent list if we've converted to btree format.
*/
if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
logflags &= ~XFS_ILOG_FEXT(whichfork);
else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
logflags &= ~XFS_ILOG_FBROOT(whichfork);
/*
* Log inode even in the error case, if the transaction
* is dirty we'll need to shut down the filesystem.
*/
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (cur) {
if (!error) {
*firstblock = cur->bc_private.b.firstblock;
cur->bc_private.b.allocated = 0;
}
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
return error;
}
/*
* Fcntl interface to xfs_bmapi.
*/
int /* error code */
xfs_getbmap(
bhv_desc_t *bdp, /* XFS behavior descriptor*/
struct getbmap *bmv, /* user bmap structure */
void __user *ap, /* pointer to user's array */
int interface) /* interface flags */
{
__int64_t bmvend; /* last block requested */
int error; /* return value */
__int64_t fixlen; /* length for -1 case */
int i; /* extent number */
xfs_inode_t *ip; /* xfs incore inode pointer */
vnode_t *vp; /* corresponding vnode */
int lock; /* lock state */
xfs_bmbt_irec_t *map; /* buffer for user's data */
xfs_mount_t *mp; /* file system mount point */
int nex; /* # of user extents can do */
int nexleft; /* # of user extents left */
int subnex; /* # of bmapi's can do */
int nmap; /* number of map entries */
struct getbmap out; /* output structure */
int whichfork; /* data or attr fork */
int prealloced; /* this is a file with
* preallocated data space */
int sh_unwritten; /* true, if unwritten */
/* extents listed separately */
int bmapi_flags; /* flags for xfs_bmapi */
__int32_t oflags; /* getbmapx bmv_oflags field */
vp = BHV_TO_VNODE(bdp);
ip = XFS_BHVTOI(bdp);
mp = ip->i_mount;
whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;
/* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
* generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
* bit is set for the file, generate a read event in order
* that the DMAPI application may do its thing before we return
* the extents. Usually this means restoring user file data to
* regions of the file that look like holes.
*
* The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
* BMV_IF_NO_DMAPI_READ so that read events are generated.
* If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
* could misinterpret holes in a DMAPI file as true holes,
* when in fact they may represent offline user data.
*/
if ( (interface & BMV_IF_NO_DMAPI_READ) == 0
&& DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)
&& whichfork == XFS_DATA_FORK) {
error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 0, 0, 0, NULL);
if (error)
return XFS_ERROR(error);
}
if (whichfork == XFS_ATTR_FORK) {
if (XFS_IFORK_Q(ip)) {
if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
return XFS_ERROR(EINVAL);
} else if (unlikely(
ip->i_d.di_aformat != 0 &&
ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
} else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
return XFS_ERROR(EINVAL);
if (whichfork == XFS_DATA_FORK) {
if ((ip->i_d.di_extsize && (ip->i_d.di_flags &
(XFS_DIFLAG_REALTIME|XFS_DIFLAG_EXTSIZE))) ||
ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
prealloced = 1;
fixlen = XFS_MAXIOFFSET(mp);
} else {
prealloced = 0;
fixlen = ip->i_d.di_size;
}
} else {
prealloced = 0;
fixlen = 1LL << 32;
}
if (bmv->bmv_length == -1) {
fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
(__int64_t)0);
} else if (bmv->bmv_length < 0)
return XFS_ERROR(EINVAL);
if (bmv->bmv_length == 0) {
bmv->bmv_entries = 0;
return 0;
}
nex = bmv->bmv_count - 1;
if (nex <= 0)
return XFS_ERROR(EINVAL);
bmvend = bmv->bmv_offset + bmv->bmv_length;
xfs_ilock(ip, XFS_IOLOCK_SHARED);
if (whichfork == XFS_DATA_FORK && ip->i_delayed_blks) {
/* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1, 0, FI_REMAPF, error);
}
ASSERT(whichfork == XFS_ATTR_FORK || ip->i_delayed_blks == 0);
lock = xfs_ilock_map_shared(ip);
/*
* Don't let nex be bigger than the number of extents
* we can have assuming alternating holes and real extents.
*/
if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
((sh_unwritten) ? 0 : XFS_BMAPI_IGSTATE);
/*
* Allocate enough space to handle "subnex" maps at a time.
*/
subnex = 16;
map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);
bmv->bmv_entries = 0;
if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
error = 0;
goto unlock_and_return;
}
nexleft = nex;
do {
nmap = (nexleft > subnex) ? subnex : nexleft;
error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
XFS_BB_TO_FSB(mp, bmv->bmv_length),
bmapi_flags, NULL, 0, map, &nmap, NULL);
if (error)
goto unlock_and_return;
ASSERT(nmap <= subnex);
for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
nexleft--;
oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
BMV_OF_PREALLOC : 0;
out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
if (map[i].br_startblock == HOLESTARTBLOCK &&
((prealloced && out.bmv_offset + out.bmv_length == bmvend) ||
whichfork == XFS_ATTR_FORK )) {
/*
* came to hole at end of file or the end of
attribute fork
*/
goto unlock_and_return;
} else {
out.bmv_block =
(map[i].br_startblock == HOLESTARTBLOCK) ?
-1 :
XFS_FSB_TO_DB(ip, map[i].br_startblock);
/* return either getbmap/getbmapx structure. */
if (interface & BMV_IF_EXTENDED) {
struct getbmapx outx;
GETBMAP_CONVERT(out,outx);
outx.bmv_oflags = oflags;
outx.bmv_unused1 = outx.bmv_unused2 = 0;
if (copy_to_user(ap, &outx,
sizeof(outx))) {
error = XFS_ERROR(EFAULT);
goto unlock_and_return;
}
} else {
if (copy_to_user(ap, &out,
sizeof(out))) {
error = XFS_ERROR(EFAULT);
goto unlock_and_return;
}
}
bmv->bmv_offset =
out.bmv_offset + out.bmv_length;
bmv->bmv_length = MAX((__int64_t)0,
(__int64_t)(bmvend - bmv->bmv_offset));
bmv->bmv_entries++;
ap = (interface & BMV_IF_EXTENDED) ?
(void __user *)
((struct getbmapx __user *)ap + 1) :
(void __user *)
((struct getbmap __user *)ap + 1);
}
}
} while (nmap && nexleft && bmv->bmv_length);
unlock_and_return:
xfs_iunlock_map_shared(ip, lock);
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
kmem_free(map, subnex * sizeof(*map));
return error;
}
/*
* Check the last inode extent to determine whether this allocation will result
* in blocks being allocated at the end of the file. When we allocate new data
* blocks at the end of the file which do not start at the previous data block,
* we will try to align the new blocks at stripe unit boundaries.
*/
STATIC int /* error */
xfs_bmap_isaeof(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t off, /* file offset in fsblocks */
int whichfork, /* data or attribute fork */
char *aeof) /* return value */
{
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
xfs_extnum_t nextents; /* size of extent list */
xfs_bmbt_irec_t s; /* expanded extent list entry */
ASSERT(whichfork == XFS_DATA_FORK);
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(NULL, ip, whichfork)))
return error;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (nextents == 0) {
*aeof = 1;
return 0;
}
/*
* Go to the last extent
*/
lastrec = &ifp->if_u1.if_extents[nextents - 1];
xfs_bmbt_get_all(lastrec, &s);
/*
* Check we are allocating in the last extent (for delayed allocations)
* or past the last extent for non-delayed allocations.
*/
*aeof = (off >= s.br_startoff &&
off < s.br_startoff + s.br_blockcount &&
ISNULLSTARTBLOCK(s.br_startblock)) ||
off >= s.br_startoff + s.br_blockcount;
return 0;
}
/*
* Check if the endoff is outside the last extent. If so the caller will grow
* the allocation to a stripe unit boundary.
*/
int /* error */
xfs_bmap_eof(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t endoff, /* file offset in fsblocks */
int whichfork, /* data or attribute fork */
int *eof) /* result value */
{
xfs_fsblock_t blockcount; /* extent block count */
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
xfs_extnum_t nextents; /* size of extent list */
xfs_fileoff_t startoff; /* extent starting file offset */
ASSERT(whichfork == XFS_DATA_FORK);
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(NULL, ip, whichfork)))
return error;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (nextents == 0) {
*eof = 1;
return 0;
}
/*
* Go to the last extent
*/
lastrec = &ifp->if_u1.if_extents[nextents - 1];
startoff = xfs_bmbt_get_startoff(lastrec);
blockcount = xfs_bmbt_get_blockcount(lastrec);
*eof = endoff >= startoff + blockcount;
return 0;
}
#ifdef DEBUG
/*
* Check that the extents list for the inode ip is in the right order.
*/
STATIC void
xfs_bmap_check_extents(
xfs_inode_t *ip, /* incore inode pointer */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_t *base; /* base of extents list */
xfs_bmbt_rec_t *ep; /* current extent entry */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* number of extents in list */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
base = ifp->if_u1.if_extents;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (ep = base; ep < &base[nextents - 1]; ep++) {
xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
(void *)(ep + 1));
}
}
STATIC
xfs_buf_t *
xfs_bmap_get_bp(
xfs_btree_cur_t *cur,
xfs_fsblock_t bno)
{
int i;
xfs_buf_t *bp;
if (!cur)
return(NULL);
bp = NULL;
for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
bp = cur->bc_bufs[i];
if (!bp) break;
if (XFS_BUF_ADDR(bp) == bno)
break; /* Found it */
}
if (i == XFS_BTREE_MAXLEVELS)
bp = NULL;
if (!bp) { /* Chase down all the log items to see if the bp is there */
xfs_log_item_chunk_t *licp;
xfs_trans_t *tp;
tp = cur->bc_tp;
licp = &tp->t_items;
while (!bp && licp != NULL) {
if (XFS_LIC_ARE_ALL_FREE(licp)) {
licp = licp->lic_next;
continue;
}
for (i = 0; i < licp->lic_unused; i++) {
xfs_log_item_desc_t *lidp;
xfs_log_item_t *lip;
xfs_buf_log_item_t *bip;
xfs_buf_t *lbp;
if (XFS_LIC_ISFREE(licp, i)) {
continue;
}
lidp = XFS_LIC_SLOT(licp, i);
lip = lidp->lid_item;
if (lip->li_type != XFS_LI_BUF)
continue;
bip = (xfs_buf_log_item_t *)lip;
lbp = bip->bli_buf;
if (XFS_BUF_ADDR(lbp) == bno) {
bp = lbp;
break; /* Found it */
}
}
licp = licp->lic_next;
}
}
return(bp);
}
void
xfs_check_block(
xfs_bmbt_block_t *block,
xfs_mount_t *mp,
int root,
short sz)
{
int i, j, dmxr;
xfs_bmbt_ptr_t *pp, *thispa; /* pointer to block address */
xfs_bmbt_key_t *prevp, *keyp;
ASSERT(be16_to_cpu(block->bb_level) > 0);
prevp = NULL;
for( i = 1; i <= be16_to_cpu(block->bb_numrecs); i++) {
dmxr = mp->m_bmap_dmxr[0];
if (root) {
keyp = XFS_BMAP_BROOT_KEY_ADDR(block, i, sz);
} else {
keyp = XFS_BTREE_KEY_ADDR(mp->m_sb.sb_blocksize,
xfs_bmbt, block, i, dmxr);
}
if (prevp) {
xfs_btree_check_key(XFS_BTNUM_BMAP, prevp, keyp);
}
prevp = keyp;
/*
* Compare the block numbers to see if there are dups.
*/
if (root) {
pp = XFS_BMAP_BROOT_PTR_ADDR(block, i, sz);
} else {
pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
xfs_bmbt, block, i, dmxr);
}
for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
if (root) {
thispa = XFS_BMAP_BROOT_PTR_ADDR(block, j, sz);
} else {
thispa = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
xfs_bmbt, block, j, dmxr);
}
if (INT_GET(*thispa, ARCH_CONVERT) ==
INT_GET(*pp, ARCH_CONVERT)) {
cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
__FUNCTION__, j, i,
INT_GET(*thispa, ARCH_CONVERT));
panic("%s: ptrs are equal in node\n",
__FUNCTION__);
}
}
}
}
/*
* Check that the extents for the inode ip are in the right order in all
* btree leaves.
*/
STATIC void
xfs_bmap_check_leaf_extents(
xfs_btree_cur_t *cur, /* btree cursor or null */
xfs_inode_t *ip, /* incore inode pointer */
int whichfork) /* data or attr fork */
{
xfs_bmbt_block_t *block; /* current btree block */
xfs_fsblock_t bno; /* block # of "block" */
xfs_buf_t *bp; /* buffer for "block" */
int error; /* error return value */
xfs_extnum_t i=0; /* index into the extents list */
xfs_ifork_t *ifp; /* fork structure */
int level; /* btree level, for checking */
xfs_mount_t *mp; /* file system mount structure */
xfs_bmbt_ptr_t *pp; /* pointer to block address */
xfs_bmbt_rec_t *ep, *lastp; /* extent pointers in block entry */
int bp_release = 0;
if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
return;
}
bno = NULLFSBLOCK;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
block = ifp->if_broot;
/*
* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
*/
level = be16_to_cpu(block->bb_level);
ASSERT(level > 0);
xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
bno = INT_GET(*pp, ARCH_CONVERT);
/*
* Go down the tree until leaf level is reached, following the first
* pointer (leftmost) at each level.
*/
while (level-- > 0) {
/* See if buf is in cur first */
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (bp) {
bp_release = 0;
} else {
bp_release = 1;
}
if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
XFS_BMAP_BTREE_REF)))
goto error_norelse;
block = XFS_BUF_TO_BMBT_BLOCK(bp);
XFS_WANT_CORRUPTED_GOTO(
XFS_BMAP_SANITY_CHECK(mp, block, level),
error0);
if (level == 0)
break;
/*
* Check this block for basic sanity (increasing keys and
* no duplicate blocks).
*/
xfs_check_block(block, mp, 0, 0);
pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
1, mp->m_bmap_dmxr[1]);
XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)), error0);
bno = INT_GET(*pp, ARCH_CONVERT);
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
}
/*
* Here with bp and block set to the leftmost leaf node in the tree.
*/
i = 0;
/*
* Loop over all leaf nodes checking that all extents are in the right order.
*/
lastp = NULL;
for (;;) {
xfs_bmbt_rec_t *frp;
xfs_fsblock_t nextbno;
xfs_extnum_t num_recs;
num_recs = be16_to_cpu(block->bb_numrecs);
/*
* Read-ahead the next leaf block, if any.
*/
nextbno = be64_to_cpu(block->bb_rightsib);
/*
* Check all the extents to make sure they are OK.
* If we had a previous block, the last entry should
* conform with the first entry in this one.
*/
frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
block, 1, mp->m_bmap_dmxr[0]);
for (ep = frp;ep < frp + (num_recs - 1); ep++) {
if (lastp) {
xfs_btree_check_rec(XFS_BTNUM_BMAP,
(void *)lastp, (void *)ep);
}
xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
(void *)(ep + 1));
}
lastp = frp + num_recs - 1; /* For the next iteration */
i += num_recs;
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
bno = nextbno;
/*
* If we've reached the end, stop.
*/
if (bno == NULLFSBLOCK)
break;
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (bp) {
bp_release = 0;
} else {
bp_release = 1;
}
if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
XFS_BMAP_BTREE_REF)))
goto error_norelse;
block = XFS_BUF_TO_BMBT_BLOCK(bp);
}
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
return;
error0:
cmn_err(CE_WARN, "%s: at error0", __FUNCTION__);
if (bp_release)
xfs_trans_brelse(NULL, bp);
error_norelse:
cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
__FUNCTION__, i);
panic("%s: CORRUPTED BTREE OR SOMETHING", __FUNCTION__);
return;
}
#endif
/*
* Count fsblocks of the given fork.
*/
int /* error */
xfs_bmap_count_blocks(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
int whichfork, /* data or attr fork */
int *count) /* out: count of blocks */
{
xfs_bmbt_block_t *block; /* current btree block */
xfs_fsblock_t bno; /* block # of "block" */
xfs_ifork_t *ifp; /* fork structure */
int level; /* btree level, for checking */
xfs_mount_t *mp; /* file system mount structure */
xfs_bmbt_ptr_t *pp; /* pointer to block address */
bno = NULLFSBLOCK;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
if (unlikely(xfs_bmap_count_leaves(ifp->if_u1.if_extents,
ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
count) < 0)) {
XFS_ERROR_REPORT("xfs_bmap_count_blocks(1)",
XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
return 0;
}
/*
* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
*/
block = ifp->if_broot;
level = be16_to_cpu(block->bb_level);
ASSERT(level > 0);
pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
bno = INT_GET(*pp, ARCH_CONVERT);
if (unlikely(xfs_bmap_count_tree(mp, tp, bno, level, count) < 0)) {
XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
mp);
return XFS_ERROR(EFSCORRUPTED);
}
return 0;
}
/*
* Recursively walks each level of a btree
* to count total fsblocks is use.
*/
int /* error */
xfs_bmap_count_tree(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_fsblock_t blockno, /* file system block number */
int levelin, /* level in btree */
int *count) /* Count of blocks */
{
int error;
xfs_buf_t *bp, *nbp;
int level = levelin;
xfs_bmbt_ptr_t *pp;
xfs_fsblock_t bno = blockno;
xfs_fsblock_t nextbno;
xfs_bmbt_block_t *block, *nextblock;
int numrecs;
xfs_bmbt_rec_t *frp;
if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
return error;
*count += 1;
block = XFS_BUF_TO_BMBT_BLOCK(bp);
if (--level) {
/* Not at node above leafs, count this level of nodes */
nextbno = be64_to_cpu(block->bb_rightsib);
while (nextbno != NULLFSBLOCK) {
if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
0, &nbp, XFS_BMAP_BTREE_REF)))
return error;
*count += 1;
nextblock = XFS_BUF_TO_BMBT_BLOCK(nbp);
nextbno = be64_to_cpu(nextblock->bb_rightsib);
xfs_trans_brelse(tp, nbp);
}
/* Dive to the next level */
pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
bno = INT_GET(*pp, ARCH_CONVERT);
if (unlikely((error =
xfs_bmap_count_tree(mp, tp, bno, level, count)) < 0)) {
xfs_trans_brelse(tp, bp);
XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
xfs_trans_brelse(tp, bp);
} else {
/* count all level 1 nodes and their leaves */
for (;;) {
nextbno = be64_to_cpu(block->bb_rightsib);
numrecs = be16_to_cpu(block->bb_numrecs);
frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize,
xfs_bmbt, block, 1, mp->m_bmap_dmxr[0]);
if (unlikely(xfs_bmap_disk_count_leaves(frp, numrecs, count) < 0)) {
xfs_trans_brelse(tp, bp);
XFS_ERROR_REPORT("xfs_bmap_count_tree(2)",
XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
xfs_trans_brelse(tp, bp);
if (nextbno == NULLFSBLOCK)
break;
bno = nextbno;
if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
XFS_BMAP_BTREE_REF)))
return error;
*count += 1;
block = XFS_BUF_TO_BMBT_BLOCK(bp);
}
}
return 0;
}
/*
* Count leaf blocks given a pointer to an extent list.
*/
int
xfs_bmap_count_leaves(
xfs_bmbt_rec_t *frp,
int numrecs,
int *count)
{
int b;
for ( b = 1; b <= numrecs; b++, frp++)
*count += xfs_bmbt_get_blockcount(frp);
return 0;
}
/*
* Count leaf blocks given a pointer to an extent list originally in btree format.
*/
int
xfs_bmap_disk_count_leaves(
xfs_bmbt_rec_t *frp,
int numrecs,
int *count)
{
int b;
for ( b = 1; b <= numrecs; b++, frp++)
*count += xfs_bmbt_disk_get_blockcount(frp);
return 0;
}
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