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authorDave Chinner <dchinner@redhat.com>2013-05-28 18:37:17 +1000
committerBen Myers <bpm@sgi.com>2013-05-30 14:32:47 -0500
commit5ae6e6a401957698f2bd8c9f4a86d86d02199fea (patch)
tree60d3a71616af63c06338370b62466f2c55dd0d38 /fs/xfs
parent56c19e89b38618390addfc743d822f99519055c6 (diff)
downloadop-kernel-dev-5ae6e6a401957698f2bd8c9f4a86d86d02199fea.zip
op-kernel-dev-5ae6e6a401957698f2bd8c9f4a86d86d02199fea.tar.gz
xfs: fix dir3 freespace block corruption
When the directory freespace index grows to a second block (2017 4k data blocks in the directory), the initialisation of the second new block header goes wrong. The write verifier fires a corruption error indicating that the block number in the header is zero. This was being tripped by xfs/110. The problem is that the initialisation of the new block is done just fine in xfs_dir3_free_get_buf(), but the caller then users a dirv2 structure to zero on-disk header fields that xfs_dir3_free_get_buf() has already zeroed. These lined up with the block number in the dir v3 header format. While looking at this, I noticed that the struct xfs_dir3_free_hdr() had 4 bytes of padding in it that wasn't defined as padding or being zeroed by the initialisation. Add a pad field declaration and fully zero the on disk and in-core headers in xfs_dir3_free_get_buf() so that this is never an issue in the future. Note that this doesn't change the on-disk layout, just makes the 32 bits of padding in the layout explicit. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Ben Myers <bpm@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_dir2_format.h1
-rw-r--r--fs/xfs/xfs_dir2_node.c13
2 files changed, 7 insertions, 7 deletions
diff --git a/fs/xfs/xfs_dir2_format.h b/fs/xfs/xfs_dir2_format.h
index a3b1bd8..995f1f5 100644
--- a/fs/xfs/xfs_dir2_format.h
+++ b/fs/xfs/xfs_dir2_format.h
@@ -715,6 +715,7 @@ struct xfs_dir3_free_hdr {
__be32 firstdb; /* db of first entry */
__be32 nvalid; /* count of valid entries */
__be32 nused; /* count of used entries */
+ __be32 pad; /* 64 bit alignment. */
};
struct xfs_dir3_free {
diff --git a/fs/xfs/xfs_dir2_node.c b/fs/xfs/xfs_dir2_node.c
index 5246de4..2226a00 100644
--- a/fs/xfs/xfs_dir2_node.c
+++ b/fs/xfs/xfs_dir2_node.c
@@ -263,18 +263,19 @@ xfs_dir3_free_get_buf(
* Initialize the new block to be empty, and remember
* its first slot as our empty slot.
*/
- hdr.magic = XFS_DIR2_FREE_MAGIC;
- hdr.firstdb = 0;
- hdr.nused = 0;
- hdr.nvalid = 0;
+ memset(bp->b_addr, 0, sizeof(struct xfs_dir3_free_hdr));
+ memset(&hdr, 0, sizeof(hdr));
+
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
hdr.magic = XFS_DIR3_FREE_MAGIC;
+
hdr3->hdr.blkno = cpu_to_be64(bp->b_bn);
hdr3->hdr.owner = cpu_to_be64(dp->i_ino);
uuid_copy(&hdr3->hdr.uuid, &mp->m_sb.sb_uuid);
- }
+ } else
+ hdr.magic = XFS_DIR2_FREE_MAGIC;
xfs_dir3_free_hdr_to_disk(bp->b_addr, &hdr);
*bpp = bp;
return 0;
@@ -1921,8 +1922,6 @@ xfs_dir2_node_addname_int(
*/
freehdr.firstdb = (fbno - XFS_DIR2_FREE_FIRSTDB(mp)) *
xfs_dir3_free_max_bests(mp);
- free->hdr.nvalid = 0;
- free->hdr.nused = 0;
} else {
free = fbp->b_addr;
bests = xfs_dir3_free_bests_p(mp, free);
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