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linux-next/fs/xfs/xfs_inode_item_recover.c
Darrick J. Wong f93e5436f0 xfs: widen ondisk inode timestamps to deal with y2038+ 
Redesign the ondisk inode timestamps to be a simple unsigned 64-bit
counter of nanoseconds since 14 Dec 1901 (i.e. the minimum time in the
32-bit unix time epoch).  This enables us to handle dates up to 2486,
which solves the y2038 problem.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
2020-09-15 20:52:41 -07:00

471 lines
14 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_trace.h"
#include "xfs_trans_priv.h"
#include "xfs_buf_item.h"
#include "xfs_log.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"
#include "xfs_icache.h"
#include "xfs_bmap_btree.h"
STATIC void
xlog_recover_inode_ra_pass2(
struct xlog *log,
struct xlog_recover_item *item)
{
if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
struct xfs_inode_log_format *ilfp = item->ri_buf[0].i_addr;
xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
&xfs_inode_buf_ra_ops);
} else {
struct xfs_inode_log_format_32 *ilfp = item->ri_buf[0].i_addr;
xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
&xfs_inode_buf_ra_ops);
}
}
/*
* Inode fork owner changes
*
* If we have been told that we have to reparent the inode fork, it's because an
* extent swap operation on a CRC enabled filesystem has been done and we are
* replaying it. We need to walk the BMBT of the appropriate fork and change the
* owners of it.
*
* The complexity here is that we don't have an inode context to work with, so
* after we've replayed the inode we need to instantiate one. This is where the
* fun begins.
*
* We are in the middle of log recovery, so we can't run transactions. That
* means we cannot use cache coherent inode instantiation via xfs_iget(), as
* that will result in the corresponding iput() running the inode through
* xfs_inactive(). If we've just replayed an inode core that changes the link
* count to zero (i.e. it's been unlinked), then xfs_inactive() will run
* transactions (bad!).
*
* So, to avoid this, we instantiate an inode directly from the inode core we've
* just recovered. We have the buffer still locked, and all we really need to
* instantiate is the inode core and the forks being modified. We can do this
* manually, then run the inode btree owner change, and then tear down the
* xfs_inode without having to run any transactions at all.
*
* Also, because we don't have a transaction context available here but need to
* gather all the buffers we modify for writeback so we pass the buffer_list
* instead for the operation to use.
*/
STATIC int
xfs_recover_inode_owner_change(
struct xfs_mount *mp,
struct xfs_dinode *dip,
struct xfs_inode_log_format *in_f,
struct list_head *buffer_list)
{
struct xfs_inode *ip;
int error;
ASSERT(in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER));
ip = xfs_inode_alloc(mp, in_f->ilf_ino);
if (!ip)
return -ENOMEM;
/* instantiate the inode */
ASSERT(dip->di_version >= 3);
error = xfs_inode_from_disk(ip, dip);
if (error)
goto out_free_ip;
if (in_f->ilf_fields & XFS_ILOG_DOWNER) {
ASSERT(in_f->ilf_fields & XFS_ILOG_DBROOT);
error = xfs_bmbt_change_owner(NULL, ip, XFS_DATA_FORK,
ip->i_ino, buffer_list);
if (error)
goto out_free_ip;
}
if (in_f->ilf_fields & XFS_ILOG_AOWNER) {
ASSERT(in_f->ilf_fields & XFS_ILOG_ABROOT);
error = xfs_bmbt_change_owner(NULL, ip, XFS_ATTR_FORK,
ip->i_ino, buffer_list);
if (error)
goto out_free_ip;
}
out_free_ip:
xfs_inode_free(ip);
return error;
}
static inline bool xfs_log_dinode_has_bigtime(const struct xfs_log_dinode *ld)
{
return ld->di_version >= 3 &&
(ld->di_flags2 & XFS_DIFLAG2_BIGTIME);
}
/* Convert a log timestamp to an ondisk timestamp. */
static inline xfs_timestamp_t
xfs_log_dinode_to_disk_ts(
struct xfs_log_dinode *from,
const xfs_ictimestamp_t its)
{
struct xfs_legacy_timestamp *lts;
struct xfs_legacy_ictimestamp *lits;
xfs_timestamp_t ts;
if (xfs_log_dinode_has_bigtime(from))
return cpu_to_be64(its);
lts = (struct xfs_legacy_timestamp *)&ts;
lits = (struct xfs_legacy_ictimestamp *)&its;
lts->t_sec = cpu_to_be32(lits->t_sec);
lts->t_nsec = cpu_to_be32(lits->t_nsec);
return ts;
}
STATIC void
xfs_log_dinode_to_disk(
struct xfs_log_dinode *from,
struct xfs_dinode *to)
{
to->di_magic = cpu_to_be16(from->di_magic);
to->di_mode = cpu_to_be16(from->di_mode);
to->di_version = from->di_version;
to->di_format = from->di_format;
to->di_onlink = 0;
to->di_uid = cpu_to_be32(from->di_uid);
to->di_gid = cpu_to_be32(from->di_gid);
to->di_nlink = cpu_to_be32(from->di_nlink);
to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
to->di_atime = xfs_log_dinode_to_disk_ts(from, from->di_atime);
to->di_mtime = xfs_log_dinode_to_disk_ts(from, from->di_mtime);
to->di_ctime = xfs_log_dinode_to_disk_ts(from, from->di_ctime);
to->di_size = cpu_to_be64(from->di_size);
to->di_nblocks = cpu_to_be64(from->di_nblocks);
to->di_extsize = cpu_to_be32(from->di_extsize);
to->di_nextents = cpu_to_be32(from->di_nextents);
to->di_anextents = cpu_to_be16(from->di_anextents);
to->di_forkoff = from->di_forkoff;
to->di_aformat = from->di_aformat;
to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
to->di_dmstate = cpu_to_be16(from->di_dmstate);
to->di_flags = cpu_to_be16(from->di_flags);
to->di_gen = cpu_to_be32(from->di_gen);
if (from->di_version == 3) {
to->di_changecount = cpu_to_be64(from->di_changecount);
to->di_crtime = xfs_log_dinode_to_disk_ts(from,
from->di_crtime);
to->di_flags2 = cpu_to_be64(from->di_flags2);
to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
to->di_ino = cpu_to_be64(from->di_ino);
to->di_lsn = cpu_to_be64(from->di_lsn);
memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
uuid_copy(&to->di_uuid, &from->di_uuid);
to->di_flushiter = 0;
} else {
to->di_flushiter = cpu_to_be16(from->di_flushiter);
}
}
STATIC int
xlog_recover_inode_commit_pass2(
struct xlog *log,
struct list_head *buffer_list,
struct xlog_recover_item *item,
xfs_lsn_t current_lsn)
{
struct xfs_inode_log_format *in_f;
struct xfs_mount *mp = log->l_mp;
struct xfs_buf *bp;
struct xfs_dinode *dip;
int len;
char *src;
char *dest;
int error;
int attr_index;
uint fields;
struct xfs_log_dinode *ldip;
uint isize;
int need_free = 0;
if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
in_f = item->ri_buf[0].i_addr;
} else {
in_f = kmem_alloc(sizeof(struct xfs_inode_log_format), 0);
need_free = 1;
error = xfs_inode_item_format_convert(&item->ri_buf[0], in_f);
if (error)
goto error;
}
/*
* Inode buffers can be freed, look out for it,
* and do not replay the inode.
*/
if (xlog_is_buffer_cancelled(log, in_f->ilf_blkno, in_f->ilf_len)) {
error = 0;
trace_xfs_log_recover_inode_cancel(log, in_f);
goto error;
}
trace_xfs_log_recover_inode_recover(log, in_f);
error = xfs_buf_read(mp->m_ddev_targp, in_f->ilf_blkno, in_f->ilf_len,
0, &bp, &xfs_inode_buf_ops);
if (error)
goto error;
ASSERT(in_f->ilf_fields & XFS_ILOG_CORE);
dip = xfs_buf_offset(bp, in_f->ilf_boffset);
/*
* Make sure the place we're flushing out to really looks
* like an inode!
*/
if (XFS_IS_CORRUPT(mp, !xfs_verify_magic16(bp, dip->di_magic))) {
xfs_alert(mp,
"%s: Bad inode magic number, dip = "PTR_FMT", dino bp = "PTR_FMT", ino = %Ld",
__func__, dip, bp, in_f->ilf_ino);
error = -EFSCORRUPTED;
goto out_release;
}
ldip = item->ri_buf[1].i_addr;
if (XFS_IS_CORRUPT(mp, ldip->di_magic != XFS_DINODE_MAGIC)) {
xfs_alert(mp,
"%s: Bad inode log record, rec ptr "PTR_FMT", ino %Ld",
__func__, item, in_f->ilf_ino);
error = -EFSCORRUPTED;
goto out_release;
}
/*
* If the inode has an LSN in it, recover the inode only if it's less
* than the lsn of the transaction we are replaying. Note: we still
* need to replay an owner change even though the inode is more recent
* than the transaction as there is no guarantee that all the btree
* blocks are more recent than this transaction, too.
*/
if (dip->di_version >= 3) {
xfs_lsn_t lsn = be64_to_cpu(dip->di_lsn);
if (lsn && lsn != -1 && XFS_LSN_CMP(lsn, current_lsn) >= 0) {
trace_xfs_log_recover_inode_skip(log, in_f);
error = 0;
goto out_owner_change;
}
}
/*
* di_flushiter is only valid for v1/2 inodes. All changes for v3 inodes
* are transactional and if ordering is necessary we can determine that
* more accurately by the LSN field in the V3 inode core. Don't trust
* the inode versions we might be changing them here - use the
* superblock flag to determine whether we need to look at di_flushiter
* to skip replay when the on disk inode is newer than the log one
*/
if (!xfs_sb_version_has_v3inode(&mp->m_sb) &&
ldip->di_flushiter < be16_to_cpu(dip->di_flushiter)) {
/*
* Deal with the wrap case, DI_MAX_FLUSH is less
* than smaller numbers
*/
if (be16_to_cpu(dip->di_flushiter) == DI_MAX_FLUSH &&
ldip->di_flushiter < (DI_MAX_FLUSH >> 1)) {
/* do nothing */
} else {
trace_xfs_log_recover_inode_skip(log, in_f);
error = 0;
goto out_release;
}
}
/* Take the opportunity to reset the flush iteration count */
ldip->di_flushiter = 0;
if (unlikely(S_ISREG(ldip->di_mode))) {
if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
(ldip->di_format != XFS_DINODE_FMT_BTREE)) {
XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(3)",
XFS_ERRLEVEL_LOW, mp, ldip,
sizeof(*ldip));
xfs_alert(mp,
"%s: Bad regular inode log record, rec ptr "PTR_FMT", "
"ino ptr = "PTR_FMT", ino bp = "PTR_FMT", ino %Ld",
__func__, item, dip, bp, in_f->ilf_ino);
error = -EFSCORRUPTED;
goto out_release;
}
} else if (unlikely(S_ISDIR(ldip->di_mode))) {
if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
(ldip->di_format != XFS_DINODE_FMT_BTREE) &&
(ldip->di_format != XFS_DINODE_FMT_LOCAL)) {
XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(4)",
XFS_ERRLEVEL_LOW, mp, ldip,
sizeof(*ldip));
xfs_alert(mp,
"%s: Bad dir inode log record, rec ptr "PTR_FMT", "
"ino ptr = "PTR_FMT", ino bp = "PTR_FMT", ino %Ld",
__func__, item, dip, bp, in_f->ilf_ino);
error = -EFSCORRUPTED;
goto out_release;
}
}
if (unlikely(ldip->di_nextents + ldip->di_anextents > ldip->di_nblocks)){
XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(5)",
XFS_ERRLEVEL_LOW, mp, ldip,
sizeof(*ldip));
xfs_alert(mp,
"%s: Bad inode log record, rec ptr "PTR_FMT", dino ptr "PTR_FMT", "
"dino bp "PTR_FMT", ino %Ld, total extents = %d, nblocks = %Ld",
__func__, item, dip, bp, in_f->ilf_ino,
ldip->di_nextents + ldip->di_anextents,
ldip->di_nblocks);
error = -EFSCORRUPTED;
goto out_release;
}
if (unlikely(ldip->di_forkoff > mp->m_sb.sb_inodesize)) {
XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(6)",
XFS_ERRLEVEL_LOW, mp, ldip,
sizeof(*ldip));
xfs_alert(mp,
"%s: Bad inode log record, rec ptr "PTR_FMT", dino ptr "PTR_FMT", "
"dino bp "PTR_FMT", ino %Ld, forkoff 0x%x", __func__,
item, dip, bp, in_f->ilf_ino, ldip->di_forkoff);
error = -EFSCORRUPTED;
goto out_release;
}
isize = xfs_log_dinode_size(mp);
if (unlikely(item->ri_buf[1].i_len > isize)) {
XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(7)",
XFS_ERRLEVEL_LOW, mp, ldip,
sizeof(*ldip));
xfs_alert(mp,
"%s: Bad inode log record length %d, rec ptr "PTR_FMT,
__func__, item->ri_buf[1].i_len, item);
error = -EFSCORRUPTED;
goto out_release;
}
/* recover the log dinode inode into the on disk inode */
xfs_log_dinode_to_disk(ldip, dip);
fields = in_f->ilf_fields;
if (fields & XFS_ILOG_DEV)
xfs_dinode_put_rdev(dip, in_f->ilf_u.ilfu_rdev);
if (in_f->ilf_size == 2)
goto out_owner_change;
len = item->ri_buf[2].i_len;
src = item->ri_buf[2].i_addr;
ASSERT(in_f->ilf_size <= 4);
ASSERT((in_f->ilf_size == 3) || (fields & XFS_ILOG_AFORK));
ASSERT(!(fields & XFS_ILOG_DFORK) ||
(len == in_f->ilf_dsize));
switch (fields & XFS_ILOG_DFORK) {
case XFS_ILOG_DDATA:
case XFS_ILOG_DEXT:
memcpy(XFS_DFORK_DPTR(dip), src, len);
break;
case XFS_ILOG_DBROOT:
xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src, len,
(struct xfs_bmdr_block *)XFS_DFORK_DPTR(dip),
XFS_DFORK_DSIZE(dip, mp));
break;
default:
/*
* There are no data fork flags set.
*/
ASSERT((fields & XFS_ILOG_DFORK) == 0);
break;
}
/*
* If we logged any attribute data, recover it. There may or
* may not have been any other non-core data logged in this
* transaction.
*/
if (in_f->ilf_fields & XFS_ILOG_AFORK) {
if (in_f->ilf_fields & XFS_ILOG_DFORK) {
attr_index = 3;
} else {
attr_index = 2;
}
len = item->ri_buf[attr_index].i_len;
src = item->ri_buf[attr_index].i_addr;
ASSERT(len == in_f->ilf_asize);
switch (in_f->ilf_fields & XFS_ILOG_AFORK) {
case XFS_ILOG_ADATA:
case XFS_ILOG_AEXT:
dest = XFS_DFORK_APTR(dip);
ASSERT(len <= XFS_DFORK_ASIZE(dip, mp));
memcpy(dest, src, len);
break;
case XFS_ILOG_ABROOT:
dest = XFS_DFORK_APTR(dip);
xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src,
len, (struct xfs_bmdr_block *)dest,
XFS_DFORK_ASIZE(dip, mp));
break;
default:
xfs_warn(log->l_mp, "%s: Invalid flag", __func__);
ASSERT(0);
error = -EFSCORRUPTED;
goto out_release;
}
}
out_owner_change:
/* Recover the swapext owner change unless inode has been deleted */
if ((in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER)) &&
(dip->di_mode != 0))
error = xfs_recover_inode_owner_change(mp, dip, in_f,
buffer_list);
/* re-generate the checksum. */
xfs_dinode_calc_crc(log->l_mp, dip);
ASSERT(bp->b_mount == mp);
bp->b_flags |= _XBF_LOGRECOVERY;
xfs_buf_delwri_queue(bp, buffer_list);
out_release:
xfs_buf_relse(bp);
error:
if (need_free)
kmem_free(in_f);
return error;
}
const struct xlog_recover_item_ops xlog_inode_item_ops = {
.item_type = XFS_LI_INODE,
.ra_pass2 = xlog_recover_inode_ra_pass2,
.commit_pass2 = xlog_recover_inode_commit_pass2,
};
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