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linux-next/fs/xfs/xfs_inode_item.c
Christoph Hellwig aa72a5cf00 xfs: simplify xfs_trans_iget 
xfs_trans_iget is a wrapper for xfs_iget that adds the inode to the
transaction after it is read.  Except when the inode already is in the
inode cache, in which case it returns the existing locked inode with
increment lock recursion counts.

Now, no one in the tree every decrements these lock recursion counts,
so any user of this gets a potential double unlock when both the original
owner of the inode and the xfs_trans_iget caller unlock it.  When looking
back in a git bisect in the historic XFS tree there was only one place
that decremented these counts, xfs_trans_iput.  Introduced in commit
ca25df7a840f426eb566d52667b6950b92bb84b5 by Adam Sweeney in 1993,
and removed in commit 19f899a3ab155ff6a49c0c79b06f2f61059afaf3 by
Steve Lord in 2003.  And as long as it didn't slip through git bisects
cracks never actually used in that time frame.

A quick audit of the callers of xfs_trans_iget shows that no caller
really relies on this behaviour fortunately - xfs_ialloc allows this
inode from disk so it must not be there before, and all the RT allocator
routines only every add each RT bitmap inode once.

In addition to removing lots of code and reducing the size of the inode
item this patch also avoids the double inode cache lookup in each
create/mkdir/mknod transaction.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Signed-off-by: Felix Blyakher <felixb@sgi.com>
2009-09-01 12:46:16 -05:00

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/*
* Copyright (c) 2000-2002,2005 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_buf_item.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_trans_priv.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rw.h"
#include "xfs_error.h"
kmem_zone_t *xfs_ili_zone; /* inode log item zone */
/*
* This returns the number of iovecs needed to log the given inode item.
*
* We need one iovec for the inode log format structure, one for the
* inode core, and possibly one for the inode data/extents/b-tree root
* and one for the inode attribute data/extents/b-tree root.
*/
STATIC uint
xfs_inode_item_size(
xfs_inode_log_item_t *iip)
{
uint nvecs;
xfs_inode_t *ip;
ip = iip->ili_inode;
nvecs = 2;
/*
* Only log the data/extents/b-tree root if there is something
* left to log.
*/
iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_EXTENTS:
iip->ili_format.ilf_fields &=
~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
XFS_ILOG_DEV | XFS_ILOG_UUID);
if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
(ip->i_d.di_nextents > 0) &&
(ip->i_df.if_bytes > 0)) {
ASSERT(ip->i_df.if_u1.if_extents != NULL);
nvecs++;
} else {
iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
}
break;
case XFS_DINODE_FMT_BTREE:
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
iip->ili_format.ilf_fields &=
~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
XFS_ILOG_DEV | XFS_ILOG_UUID);
if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
(ip->i_df.if_broot_bytes > 0)) {
ASSERT(ip->i_df.if_broot != NULL);
nvecs++;
} else {
ASSERT(!(iip->ili_format.ilf_fields &
XFS_ILOG_DBROOT));
#ifdef XFS_TRANS_DEBUG
if (iip->ili_root_size > 0) {
ASSERT(iip->ili_root_size ==
ip->i_df.if_broot_bytes);
ASSERT(memcmp(iip->ili_orig_root,
ip->i_df.if_broot,
iip->ili_root_size) == 0);
} else {
ASSERT(ip->i_df.if_broot_bytes == 0);
}
#endif
iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
}
break;
case XFS_DINODE_FMT_LOCAL:
iip->ili_format.ilf_fields &=
~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
XFS_ILOG_DEV | XFS_ILOG_UUID);
if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
(ip->i_df.if_bytes > 0)) {
ASSERT(ip->i_df.if_u1.if_data != NULL);
ASSERT(ip->i_d.di_size > 0);
nvecs++;
} else {
iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
}
break;
case XFS_DINODE_FMT_DEV:
iip->ili_format.ilf_fields &=
~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
XFS_ILOG_DEXT | XFS_ILOG_UUID);
break;
case XFS_DINODE_FMT_UUID:
iip->ili_format.ilf_fields &=
~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
XFS_ILOG_DEXT | XFS_ILOG_DEV);
break;
default:
ASSERT(0);
break;
}
/*
* If there are no attributes associated with this file,
* then there cannot be anything more to log.
* Clear all attribute-related log flags.
*/
if (!XFS_IFORK_Q(ip)) {
iip->ili_format.ilf_fields &=
~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
return nvecs;
}
/*
* Log any necessary attribute data.
*/
switch (ip->i_d.di_aformat) {
case XFS_DINODE_FMT_EXTENTS:
iip->ili_format.ilf_fields &=
~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
(ip->i_d.di_anextents > 0) &&
(ip->i_afp->if_bytes > 0)) {
ASSERT(ip->i_afp->if_u1.if_extents != NULL);
nvecs++;
} else {
iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
}
break;
case XFS_DINODE_FMT_BTREE:
iip->ili_format.ilf_fields &=
~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
(ip->i_afp->if_broot_bytes > 0)) {
ASSERT(ip->i_afp->if_broot != NULL);
nvecs++;
} else {
iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
}
break;
case XFS_DINODE_FMT_LOCAL:
iip->ili_format.ilf_fields &=
~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
(ip->i_afp->if_bytes > 0)) {
ASSERT(ip->i_afp->if_u1.if_data != NULL);
nvecs++;
} else {
iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
}
break;
default:
ASSERT(0);
break;
}
return nvecs;
}
/*
* This is called to fill in the vector of log iovecs for the
* given inode log item. It fills the first item with an inode
* log format structure, the second with the on-disk inode structure,
* and a possible third and/or fourth with the inode data/extents/b-tree
* root and inode attributes data/extents/b-tree root.
*/
STATIC void
xfs_inode_item_format(
xfs_inode_log_item_t *iip,
xfs_log_iovec_t *log_vector)
{
uint nvecs;
xfs_log_iovec_t *vecp;
xfs_inode_t *ip;
size_t data_bytes;
xfs_bmbt_rec_t *ext_buffer;
int nrecs;
xfs_mount_t *mp;
ip = iip->ili_inode;
vecp = log_vector;
vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
vecp->i_len = sizeof(xfs_inode_log_format_t);
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
vecp++;
nvecs = 1;
/*
* Clear i_update_core if the timestamps (or any other
* non-transactional modification) need flushing/logging
* and we're about to log them with the rest of the core.
*
* This is the same logic as xfs_iflush() but this code can't
* run at the same time as xfs_iflush because we're in commit
* processing here and so we have the inode lock held in
* exclusive mode. Although it doesn't really matter
* for the timestamps if both routines were to grab the
* timestamps or not. That would be ok.
*
* We clear i_update_core before copying out the data.
* This is for coordination with our timestamp updates
* that don't hold the inode lock. They will always
* update the timestamps BEFORE setting i_update_core,
* so if we clear i_update_core after they set it we
* are guaranteed to see their updates to the timestamps
* either here. Likewise, if they set it after we clear it
* here, we'll see it either on the next commit of this
* inode or the next time the inode gets flushed via
* xfs_iflush(). This depends on strongly ordered memory
* semantics, but we have that. We use the SYNCHRONIZE
* macro to make sure that the compiler does not reorder
* the i_update_core access below the data copy below.
*/
if (ip->i_update_core) {
ip->i_update_core = 0;
SYNCHRONIZE();
}
/*
* Make sure to get the latest atime from the Linux inode.
*/
xfs_synchronize_atime(ip);
/*
* make sure the linux inode is dirty
*/
xfs_mark_inode_dirty_sync(ip);
vecp->i_addr = (xfs_caddr_t)&ip->i_d;
vecp->i_len = sizeof(struct xfs_icdinode);
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
vecp++;
nvecs++;
iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
/*
* If this is really an old format inode, then we need to
* log it as such. This means that we have to copy the link
* count from the new field to the old. We don't have to worry
* about the new fields, because nothing trusts them as long as
* the old inode version number is there. If the superblock already
* has a new version number, then we don't bother converting back.
*/
mp = ip->i_mount;
ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb));
if (ip->i_d.di_version == 1) {
if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
/*
* Convert it back.
*/
ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
ip->i_d.di_onlink = ip->i_d.di_nlink;
} else {
/*
* The superblock version has already been bumped,
* so just make the conversion to the new inode
* format permanent.
*/
ip->i_d.di_version = 2;
ip->i_d.di_onlink = 0;
memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
}
}
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_EXTENTS:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
XFS_ILOG_DEV | XFS_ILOG_UUID)));
if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
ASSERT(ip->i_df.if_bytes > 0);
ASSERT(ip->i_df.if_u1.if_extents != NULL);
ASSERT(ip->i_d.di_nextents > 0);
ASSERT(iip->ili_extents_buf == NULL);
nrecs = ip->i_df.if_bytes /
(uint)sizeof(xfs_bmbt_rec_t);
ASSERT(nrecs > 0);
#ifdef XFS_NATIVE_HOST
if (nrecs == ip->i_d.di_nextents) {
/*
* There are no delayed allocation
* extents, so just point to the
* real extents array.
*/
vecp->i_addr =
(char *)(ip->i_df.if_u1.if_extents);
vecp->i_len = ip->i_df.if_bytes;
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
} else
#endif
{
/*
* There are delayed allocation extents
* in the inode, or we need to convert
* the extents to on disk format.
* Use xfs_iextents_copy()
* to copy only the real extents into
* a separate buffer. We'll free the
* buffer in the unlock routine.
*/
ext_buffer = kmem_alloc(ip->i_df.if_bytes,
KM_SLEEP);
iip->ili_extents_buf = ext_buffer;
vecp->i_addr = (xfs_caddr_t)ext_buffer;
vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
XFS_DATA_FORK);
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
}
ASSERT(vecp->i_len <= ip->i_df.if_bytes);
iip->ili_format.ilf_dsize = vecp->i_len;
vecp++;
nvecs++;
}
break;
case XFS_DINODE_FMT_BTREE:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
XFS_ILOG_DEV | XFS_ILOG_UUID)));
if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
ASSERT(ip->i_df.if_broot_bytes > 0);
ASSERT(ip->i_df.if_broot != NULL);
vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
vecp->i_len = ip->i_df.if_broot_bytes;
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
vecp++;
nvecs++;
iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
}
break;
case XFS_DINODE_FMT_LOCAL:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
XFS_ILOG_DEV | XFS_ILOG_UUID)));
if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
ASSERT(ip->i_df.if_bytes > 0);
ASSERT(ip->i_df.if_u1.if_data != NULL);
ASSERT(ip->i_d.di_size > 0);
vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
/*
* Round i_bytes up to a word boundary.
* The underlying memory is guaranteed to
* to be there by xfs_idata_realloc().
*/
data_bytes = roundup(ip->i_df.if_bytes, 4);
ASSERT((ip->i_df.if_real_bytes == 0) ||
(ip->i_df.if_real_bytes == data_bytes));
vecp->i_len = (int)data_bytes;
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
vecp++;
nvecs++;
iip->ili_format.ilf_dsize = (unsigned)data_bytes;
}
break;
case XFS_DINODE_FMT_DEV:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
XFS_ILOG_DDATA | XFS_ILOG_UUID)));
if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
iip->ili_format.ilf_u.ilfu_rdev =
ip->i_df.if_u2.if_rdev;
}
break;
case XFS_DINODE_FMT_UUID:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
XFS_ILOG_DDATA | XFS_ILOG_DEV)));
if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
iip->ili_format.ilf_u.ilfu_uuid =
ip->i_df.if_u2.if_uuid;
}
break;
default:
ASSERT(0);
break;
}
/*
* If there are no attributes associated with the file,
* then we're done.
* Assert that no attribute-related log flags are set.
*/
if (!XFS_IFORK_Q(ip)) {
ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
iip->ili_format.ilf_size = nvecs;
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
return;
}
switch (ip->i_d.di_aformat) {
case XFS_DINODE_FMT_EXTENTS:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
ASSERT(ip->i_afp->if_bytes > 0);
ASSERT(ip->i_afp->if_u1.if_extents != NULL);
ASSERT(ip->i_d.di_anextents > 0);
#ifdef DEBUG
nrecs = ip->i_afp->if_bytes /
(uint)sizeof(xfs_bmbt_rec_t);
#endif
ASSERT(nrecs > 0);
ASSERT(nrecs == ip->i_d.di_anextents);
#ifdef XFS_NATIVE_HOST
/*
* There are not delayed allocation extents
* for attributes, so just point at the array.
*/
vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
vecp->i_len = ip->i_afp->if_bytes;
#else
ASSERT(iip->ili_aextents_buf == NULL);
/*
* Need to endian flip before logging
*/
ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
KM_SLEEP);
iip->ili_aextents_buf = ext_buffer;
vecp->i_addr = (xfs_caddr_t)ext_buffer;
vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
XFS_ATTR_FORK);
#endif
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
iip->ili_format.ilf_asize = vecp->i_len;
vecp++;
nvecs++;
}
break;
case XFS_DINODE_FMT_BTREE:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
ASSERT(ip->i_afp->if_broot_bytes > 0);
ASSERT(ip->i_afp->if_broot != NULL);
vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
vecp->i_len = ip->i_afp->if_broot_bytes;
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
vecp++;
nvecs++;
iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
}
break;
case XFS_DINODE_FMT_LOCAL:
ASSERT(!(iip->ili_format.ilf_fields &
(XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
ASSERT(ip->i_afp->if_bytes > 0);
ASSERT(ip->i_afp->if_u1.if_data != NULL);
vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
/*
* Round i_bytes up to a word boundary.
* The underlying memory is guaranteed to
* to be there by xfs_idata_realloc().
*/
data_bytes = roundup(ip->i_afp->if_bytes, 4);
ASSERT((ip->i_afp->if_real_bytes == 0) ||
(ip->i_afp->if_real_bytes == data_bytes));
vecp->i_len = (int)data_bytes;
XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
vecp++;
nvecs++;
iip->ili_format.ilf_asize = (unsigned)data_bytes;
}
break;
default:
ASSERT(0);
break;
}
ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
iip->ili_format.ilf_size = nvecs;
}
/*
* This is called to pin the inode associated with the inode log
* item in memory so it cannot be written out. Do this by calling
* xfs_ipin() to bump the pin count in the inode while holding the
* inode pin lock.
*/
STATIC void
xfs_inode_item_pin(
xfs_inode_log_item_t *iip)
{
ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
xfs_ipin(iip->ili_inode);
}
/*
* This is called to unpin the inode associated with the inode log
* item which was previously pinned with a call to xfs_inode_item_pin().
* Just call xfs_iunpin() on the inode to do this.
*/
/* ARGSUSED */
STATIC void
xfs_inode_item_unpin(
xfs_inode_log_item_t *iip,
int stale)
{
xfs_iunpin(iip->ili_inode);
}
/* ARGSUSED */
STATIC void
xfs_inode_item_unpin_remove(
xfs_inode_log_item_t *iip,
xfs_trans_t *tp)
{
xfs_iunpin(iip->ili_inode);
}
/*
* This is called to attempt to lock the inode associated with this
* inode log item, in preparation for the push routine which does the actual
* iflush. Don't sleep on the inode lock or the flush lock.
*
* If the flush lock is already held, indicating that the inode has
* been or is in the process of being flushed, then (ideally) we'd like to
* see if the inode's buffer is still incore, and if so give it a nudge.
* We delay doing so until the pushbuf routine, though, to avoid holding
* the AIL lock across a call to the blackhole which is the buffer cache.
* Also we don't want to sleep in any device strategy routines, which can happen
* if we do the subsequent bawrite in here.
*/
STATIC uint
xfs_inode_item_trylock(
xfs_inode_log_item_t *iip)
{
register xfs_inode_t *ip;
ip = iip->ili_inode;
if (xfs_ipincount(ip) > 0) {
return XFS_ITEM_PINNED;
}
if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
return XFS_ITEM_LOCKED;
}
if (!xfs_iflock_nowait(ip)) {
/*
* If someone else isn't already trying to push the inode
* buffer, we get to do it.
*/
if (iip->ili_pushbuf_flag == 0) {
iip->ili_pushbuf_flag = 1;
#ifdef DEBUG
iip->ili_push_owner = current_pid();
#endif
/*
* Inode is left locked in shared mode.
* Pushbuf routine gets to unlock it.
*/
return XFS_ITEM_PUSHBUF;
} else {
/*
* We hold the AIL lock, so we must specify the
* NONOTIFY flag so that we won't double trip.
*/
xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
return XFS_ITEM_FLUSHING;
}
/* NOTREACHED */
}
/* Stale items should force out the iclog */
if (ip->i_flags & XFS_ISTALE) {
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
return XFS_ITEM_PINNED;
}
#ifdef DEBUG
if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
ASSERT(iip->ili_format.ilf_fields != 0);
ASSERT(iip->ili_logged == 0);
ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
}
#endif
return XFS_ITEM_SUCCESS;
}
/*
* Unlock the inode associated with the inode log item.
* Clear the fields of the inode and inode log item that
* are specific to the current transaction. If the
* hold flags is set, do not unlock the inode.
*/
STATIC void
xfs_inode_item_unlock(
xfs_inode_log_item_t *iip)
{
uint hold;
uint iolocked;
uint lock_flags;
xfs_inode_t *ip;
ASSERT(iip != NULL);
ASSERT(iip->ili_inode->i_itemp != NULL);
ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
XFS_ILI_IOLOCKED_EXCL)) ||
xfs_isilocked(iip->ili_inode, XFS_IOLOCK_EXCL));
ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
XFS_ILI_IOLOCKED_SHARED)) ||
xfs_isilocked(iip->ili_inode, XFS_IOLOCK_SHARED));
/*
* Clear the transaction pointer in the inode.
*/
ip = iip->ili_inode;
ip->i_transp = NULL;
/*
* If the inode needed a separate buffer with which to log
* its extents, then free it now.
*/
if (iip->ili_extents_buf != NULL) {
ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
ASSERT(ip->i_d.di_nextents > 0);
ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
ASSERT(ip->i_df.if_bytes > 0);
kmem_free(iip->ili_extents_buf);
iip->ili_extents_buf = NULL;
}
if (iip->ili_aextents_buf != NULL) {
ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
ASSERT(ip->i_d.di_anextents > 0);
ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
ASSERT(ip->i_afp->if_bytes > 0);
kmem_free(iip->ili_aextents_buf);
iip->ili_aextents_buf = NULL;
}
/*
* Figure out if we should unlock the inode or not.
*/
hold = iip->ili_flags & XFS_ILI_HOLD;
/*
* Before clearing out the flags, remember whether we
* are holding the inode's IO lock.
*/
iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
/*
* Clear out the fields of the inode log item particular
* to the current transaction.
*/
iip->ili_flags = 0;
/*
* Unlock the inode if XFS_ILI_HOLD was not set.
*/
if (!hold) {
lock_flags = XFS_ILOCK_EXCL;
if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
lock_flags |= XFS_IOLOCK_EXCL;
} else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
lock_flags |= XFS_IOLOCK_SHARED;
}
xfs_iput(iip->ili_inode, lock_flags);
}
}
/*
* This is called to find out where the oldest active copy of the
* inode log item in the on disk log resides now that the last log
* write of it completed at the given lsn. Since we always re-log
* all dirty data in an inode, the latest copy in the on disk log
* is the only one that matters. Therefore, simply return the
* given lsn.
*/
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_inode_item_committed(
xfs_inode_log_item_t *iip,
xfs_lsn_t lsn)
{
return (lsn);
}
/*
* This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
* failed to get the inode flush lock but did get the inode locked SHARED.
* Here we're trying to see if the inode buffer is incore, and if so whether it's
* marked delayed write. If that's the case, we'll initiate a bawrite on that
* buffer to expedite the process.
*
* We aren't holding the AIL lock (or the flush lock) when this gets called,
* so it is inherently race-y.
*/
STATIC void
xfs_inode_item_pushbuf(
xfs_inode_log_item_t *iip)
{
xfs_inode_t *ip;
xfs_mount_t *mp;
xfs_buf_t *bp;
uint dopush;
ip = iip->ili_inode;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
/*
* The ili_pushbuf_flag keeps others from
* trying to duplicate our effort.
*/
ASSERT(iip->ili_pushbuf_flag != 0);
ASSERT(iip->ili_push_owner == current_pid());
/*
* If a flush is not in progress anymore, chances are that the
* inode was taken off the AIL. So, just get out.
*/
if (completion_done(&ip->i_flush) ||
((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
iip->ili_pushbuf_flag = 0;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return;
}
mp = ip->i_mount;
bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
if (bp != NULL) {
if (XFS_BUF_ISDELAYWRITE(bp)) {
/*
* We were racing with iflush because we don't hold
* the AIL lock or the flush lock. However, at this point,
* we have the buffer, and we know that it's dirty.
* So, it's possible that iflush raced with us, and
* this item is already taken off the AIL.
* If not, we can flush it async.
*/
dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
!completion_done(&ip->i_flush));
iip->ili_pushbuf_flag = 0;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
xfs_buftrace("INODE ITEM PUSH", bp);
if (XFS_BUF_ISPINNED(bp)) {
xfs_log_force(mp, (xfs_lsn_t)0,
XFS_LOG_FORCE);
}
if (dopush) {
int error;
error = xfs_bawrite(mp, bp);
if (error)
xfs_fs_cmn_err(CE_WARN, mp,
"xfs_inode_item_pushbuf: pushbuf error %d on iip %p, bp %p",
error, iip, bp);
} else {
xfs_buf_relse(bp);
}
} else {
iip->ili_pushbuf_flag = 0;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
xfs_buf_relse(bp);
}
return;
}
/*
* We have to be careful about resetting pushbuf flag too early (above).
* Even though in theory we can do it as soon as we have the buflock,
* we don't want others to be doing work needlessly. They'll come to
* this function thinking that pushing the buffer is their
* responsibility only to find that the buffer is still locked by
* another doing the same thing
*/
iip->ili_pushbuf_flag = 0;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return;
}
/*
* This is called to asynchronously write the inode associated with this
* inode log item out to disk. The inode will already have been locked by
* a successful call to xfs_inode_item_trylock().
*/
STATIC void
xfs_inode_item_push(
xfs_inode_log_item_t *iip)
{
xfs_inode_t *ip;
ip = iip->ili_inode;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
ASSERT(!completion_done(&ip->i_flush));
/*
* Since we were able to lock the inode's flush lock and
* we found it on the AIL, the inode must be dirty. This
* is because the inode is removed from the AIL while still
* holding the flush lock in xfs_iflush_done(). Thus, if
* we found it in the AIL and were able to obtain the flush
* lock without sleeping, then there must not have been
* anyone in the process of flushing the inode.
*/
ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
iip->ili_format.ilf_fields != 0);
/*
* Write out the inode. The completion routine ('iflush_done') will
* pull it from the AIL, mark it clean, unlock the flush lock.
*/
(void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return;
}
/*
* XXX rcc - this one really has to do something. Probably needs
* to stamp in a new field in the incore inode.
*/
/* ARGSUSED */
STATIC void
xfs_inode_item_committing(
xfs_inode_log_item_t *iip,
xfs_lsn_t lsn)
{
iip->ili_last_lsn = lsn;
return;
}
/*
* This is the ops vector shared by all buf log items.
*/
static struct xfs_item_ops xfs_inode_item_ops = {
.iop_size = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
.iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
xfs_inode_item_format,
.iop_pin = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
.iop_unpin = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
xfs_inode_item_unpin_remove,
.iop_trylock = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
.iop_unlock = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
.iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
xfs_inode_item_committed,
.iop_push = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
.iop_pushbuf = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
xfs_inode_item_committing
};
/*
* Initialize the inode log item for a newly allocated (in-core) inode.
*/
void
xfs_inode_item_init(
xfs_inode_t *ip,
xfs_mount_t *mp)
{
xfs_inode_log_item_t *iip;
ASSERT(ip->i_itemp == NULL);
iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
iip->ili_item.li_type = XFS_LI_INODE;
iip->ili_item.li_ops = &xfs_inode_item_ops;
iip->ili_item.li_mountp = mp;
iip->ili_item.li_ailp = mp->m_ail;
iip->ili_inode = ip;
/*
We have zeroed memory. No need ...
iip->ili_extents_buf = NULL;
iip->ili_pushbuf_flag = 0;
*/
iip->ili_format.ilf_type = XFS_LI_INODE;
iip->ili_format.ilf_ino = ip->i_ino;
iip->ili_format.ilf_blkno = ip->i_imap.im_blkno;
iip->ili_format.ilf_len = ip->i_imap.im_len;
iip->ili_format.ilf_boffset = ip->i_imap.im_boffset;
}
/*
* Free the inode log item and any memory hanging off of it.
*/
void
xfs_inode_item_destroy(
xfs_inode_t *ip)
{
#ifdef XFS_TRANS_DEBUG
if (ip->i_itemp->ili_root_size != 0) {
kmem_free(ip->i_itemp->ili_orig_root);
}
#endif
kmem_zone_free(xfs_ili_zone, ip->i_itemp);
}
/*
* This is the inode flushing I/O completion routine. It is called
* from interrupt level when the buffer containing the inode is
* flushed to disk. It is responsible for removing the inode item
* from the AIL if it has not been re-logged, and unlocking the inode's
* flush lock.
*/
/*ARGSUSED*/
void
xfs_iflush_done(
xfs_buf_t *bp,
xfs_inode_log_item_t *iip)
{
xfs_inode_t *ip = iip->ili_inode;
struct xfs_ail *ailp = iip->ili_item.li_ailp;
/*
* We only want to pull the item from the AIL if it is
* actually there and its location in the log has not
* changed since we started the flush. Thus, we only bother
* if the ili_logged flag is set and the inode's lsn has not
* changed. First we check the lsn outside
* the lock since it's cheaper, and then we recheck while
* holding the lock before removing the inode from the AIL.
*/
if (iip->ili_logged &&
(iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
spin_lock(&ailp->xa_lock);
if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
/* xfs_trans_ail_delete() drops the AIL lock. */
xfs_trans_ail_delete(ailp, (xfs_log_item_t*)iip);
} else {
spin_unlock(&ailp->xa_lock);
}
}
iip->ili_logged = 0;
/*
* Clear the ili_last_fields bits now that we know that the
* data corresponding to them is safely on disk.
*/
iip->ili_last_fields = 0;
/*
* Release the inode's flush lock since we're done with it.
*/
xfs_ifunlock(ip);
return;
}
/*
* This is the inode flushing abort routine. It is called
* from xfs_iflush when the filesystem is shutting down to clean
* up the inode state.
* It is responsible for removing the inode item
* from the AIL if it has not been re-logged, and unlocking the inode's
* flush lock.
*/
void
xfs_iflush_abort(
xfs_inode_t *ip)
{
xfs_inode_log_item_t *iip = ip->i_itemp;
xfs_mount_t *mp;
iip = ip->i_itemp;
mp = ip->i_mount;
if (iip) {
struct xfs_ail *ailp = iip->ili_item.li_ailp;
if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
spin_lock(&ailp->xa_lock);
if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
/* xfs_trans_ail_delete() drops the AIL lock. */
xfs_trans_ail_delete(ailp, (xfs_log_item_t *)iip);
} else
spin_unlock(&ailp->xa_lock);
}
iip->ili_logged = 0;
/*
* Clear the ili_last_fields bits now that we know that the
* data corresponding to them is safely on disk.
*/
iip->ili_last_fields = 0;
/*
* Clear the inode logging fields so no more flushes are
* attempted.
*/
iip->ili_format.ilf_fields = 0;
}
/*
* Release the inode's flush lock since we're done with it.
*/
xfs_ifunlock(ip);
}
void
xfs_istale_done(
xfs_buf_t *bp,
xfs_inode_log_item_t *iip)
{
xfs_iflush_abort(iip->ili_inode);
}
/*
* convert an xfs_inode_log_format struct from either 32 or 64 bit versions
* (which can have different field alignments) to the native version
*/
int
xfs_inode_item_format_convert(
xfs_log_iovec_t *buf,
xfs_inode_log_format_t *in_f)
{
if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
xfs_inode_log_format_32_t *in_f32;
in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
in_f->ilf_type = in_f32->ilf_type;
in_f->ilf_size = in_f32->ilf_size;
in_f->ilf_fields = in_f32->ilf_fields;
in_f->ilf_asize = in_f32->ilf_asize;
in_f->ilf_dsize = in_f32->ilf_dsize;
in_f->ilf_ino = in_f32->ilf_ino;
/* copy biggest field of ilf_u */
memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
in_f32->ilf_u.ilfu_uuid.__u_bits,
sizeof(uuid_t));
in_f->ilf_blkno = in_f32->ilf_blkno;
in_f->ilf_len = in_f32->ilf_len;
in_f->ilf_boffset = in_f32->ilf_boffset;
return 0;
} else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
xfs_inode_log_format_64_t *in_f64;
in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
in_f->ilf_type = in_f64->ilf_type;
in_f->ilf_size = in_f64->ilf_size;
in_f->ilf_fields = in_f64->ilf_fields;
in_f->ilf_asize = in_f64->ilf_asize;
in_f->ilf_dsize = in_f64->ilf_dsize;
in_f->ilf_ino = in_f64->ilf_ino;
/* copy biggest field of ilf_u */
memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
in_f64->ilf_u.ilfu_uuid.__u_bits,
sizeof(uuid_t));
in_f->ilf_blkno = in_f64->ilf_blkno;
in_f->ilf_len = in_f64->ilf_len;
in_f->ilf_boffset = in_f64->ilf_boffset;
return 0;
}
return EFSCORRUPTED;
}
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