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xfs: fix for 3.11-rc3

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- fix for regression in commit cca9f93a52, recovery causing filesystem
   corruption after a crash
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Merge tag 'for-linus-v3.11-rc3' of git://oss.sgi.com/xfs/xfs

Pull xfs fix from Ben Myers:
 "Fix for regression in commit cca9f93a52 ("xfs: don't do IO when
  creating an new inode"), recovery causing filesystem corruption after
  a crash"

* tag 'for-linus-v3.11-rc3' of git://oss.sgi.com/xfs/xfs:
  xfs: di_flushiter considered harmful
This commit is contained in:
Linus Torvalds 2013-07-26 11:22:54 -07:00
commit 6c4155a9cd
3 changed files with 36 additions and 11 deletions
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3
fs/xfs/xfs_dinode.h
View File

@ -39,6 +39,9 @@ typedef struct xfs_timestamp {
* There is a very similar struct icdinode in xfs_inode which matches the
* layout of the first 96 bytes of this structure, but is kept in native
* format instead of big endian.
*
* Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
* padding field for v3 inodes.
*/
typedef struct xfs_dinode {
__be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */

31
fs/xfs/xfs_inode.c
View File

@ -896,7 +896,6 @@ xfs_dinode_to_disk(
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_flushiter = cpu_to_be16(from->di_flushiter);
to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
@ -924,6 +923,9 @@ xfs_dinode_to_disk(
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);
}
}
@ -1029,10 +1031,14 @@ xfs_dinode_calc_crc(
/*
* Read the disk inode attributes into the in-core inode structure.
*
* If we are initialising a new inode and we are not utilising the
* XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new inode core
* with a random generation number. If we are keeping inodes around, we need to
* read the inode cluster to get the existing generation number off disk.
* For version 5 superblocks, if we are initialising a new inode and we are not
* utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
* inode core with a random generation number. If we are keeping inodes around,
* we need to read the inode cluster to get the existing generation number off
* disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
* format) then log recovery is dependent on the di_flushiter field being
* initialised from the current on-disk value and hence we must also read the
* inode off disk.
*/
int
xfs_iread(
@ -1054,6 +1060,7 @@ xfs_iread(
/* shortcut IO on inode allocation if possible */
if ((iget_flags & XFS_IGET_CREATE) &&
xfs_sb_version_hascrc(&mp->m_sb) &&
!(mp->m_flags & XFS_MOUNT_IKEEP)) {
/* initialise the on-disk inode core */
memset(&ip->i_d, 0, sizeof(ip->i_d));
@ -2882,12 +2889,18 @@ xfs_iflush_int(
__func__, ip->i_ino, ip->i_d.di_forkoff, ip);
goto corrupt_out;
}
/*
* bump the flush iteration count, used to detect flushes which
* postdate a log record during recovery. This is redundant as we now
* log every change and hence this can't happen. Still, it doesn't hurt.
* Inode item log recovery for v1/v2 inodes are dependent on the
* di_flushiter count for correct sequencing. We bump the flush
* iteration count so we can detect flushes which postdate a log record
* during recovery. This is redundant as we now log every change and
* hence this can't happen but we need to still do it to ensure
* backwards compatibility with old kernels that predate logging all
* inode changes.
*/
ip->i_d.di_flushiter++;
if (ip->i_d.di_version < 3)
ip->i_d.di_flushiter++;
/*
* Copy the dirty parts of the inode into the on-disk

13
fs/xfs/xfs_log_recover.c
View File

@ -2592,8 +2592,16 @@ xlog_recover_inode_pass2(
goto error;
}
/* Skip replay when the on disk inode is newer than the log one */
if (dicp->di_flushiter < be16_to_cpu(dip->di_flushiter)) {
/*
* 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_hascrc(&mp->m_sb) &&
dicp->di_flushiter < be16_to_cpu(dip->di_flushiter)) {
/*
* Deal with the wrap case, DI_MAX_FLUSH is less
* than smaller numbers
@ -2608,6 +2616,7 @@ xlog_recover_inode_pass2(
goto error;
}
}
/* Take the opportunity to reset the flush iteration count */
dicp->di_flushiter = 0;