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 cca9f93a52d2 ("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
diff --git a/fs/xfs/xfs_dinode.h b/fs/xfs/xfs_dinode.h
index 07d735a..e5869b5 100644
--- a/fs/xfs/xfs_dinode.h
+++ b/fs/xfs/xfs_dinode.h
@@ -39,6 +39,9 @@
* 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 */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index b78481f..bb262c2 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -896,7 +896,6 @@
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 @@
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 @@
/*
* 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 @@
/* 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 @@
__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
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 6fcc910a..7681b19 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2592,8 +2592,16 @@
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 @@
goto error;
}
}
+
/* Take the opportunity to reset the flush iteration count */
dicp->di_flushiter = 0;