diff options
| author | Brian Foster <bfoster@redhat.com> | 2018-07-11 22:26:22 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-07-11 22:26:22 -0700 |
| commit | 766139032f95bb41031f6de9c2ee0538bd035229 (patch) | |
| tree | dc21b2a2b9a56c8ea4dabc3362fccb065e857605 /fs/xfs/libxfs/xfs_da_btree.c | |
| parent | 825d75cd8c1b53883dd8c2fe1d8833c371b08074 (diff) | |
xfs: use ->t_firstblock in xattr ops
Similar to the dirops code, the xattr code uses an on-stack
firstblock variable for the various operations. This code rolls the
underlying transaction in various places, however, which means we
cannot simply replace the local firstblock vars with ->t_firstblock.
Doing so (without further changes) would invalidate the memory
pointed to by xfs_da_args.firstblock as soon as the first
transaction rolls.
To avoid this problem, remove xfs_da_args.firstblock and replace all
such accesses with ->t_firstblock at the same time. This ensures
that accesses to the current firstblock always occur through the
current transaction rather than a potentially invalid xfs_da_args
pointer.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_da_btree.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_da_btree.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/xfs/libxfs/xfs_da_btree.c b/fs/xfs/libxfs/xfs_da_btree.c index 68a72e3d9f53..2f2be86c10dc 100644 --- a/fs/xfs/libxfs/xfs_da_btree.c +++ b/fs/xfs/libxfs/xfs_da_btree.c @@ -2059,10 +2059,9 @@ xfs_da_grow_inode_int( * Try mapping it in one filesystem block. */ nmap = 1; - ASSERT(args->firstblock != NULL); error = xfs_bmapi_write(tp, dp, *bno, count, xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG, - args->firstblock, args->total, &map, &nmap); + &tp->t_firstblock, args->total, &map, &nmap); if (error) return error; @@ -2084,7 +2083,7 @@ xfs_da_grow_inode_int( c = (int)(*bno + count - b); error = xfs_bmapi_write(tp, dp, b, c, xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA, - args->firstblock, args->total, + &tp->t_firstblock, args->total, &mapp[mapi], &nmap); if (error) goto out_free_map; @@ -2394,7 +2393,7 @@ xfs_da_shrink_inode( * the last block to the place we want to kill. */ error = xfs_bunmapi(tp, dp, dead_blkno, count, - xfs_bmapi_aflag(w), 0, args->firstblock, + xfs_bmapi_aflag(w), 0, &tp->t_firstblock, &done); if (error == -ENOSPC) { if (w != XFS_DATA_FORK) |