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authorVlad Apostolov <vapo@sgi.com>2007-10-11 17:44:18 +1000
committerTim Shimmin <tes@chook.melbourne.sgi.com>2007-10-16 12:21:15 +1000
commit859d718279b6e1d6bc27a701db47c1be720b5907 (patch)
treea3b867865c5fcd44fdf5f1f1a0c960a2deb173d6 /fs/xfs
parentba532a980b7dcccf5eebd2cd409a9cb37faa2bb4 (diff)
downloadop-kernel-dev-859d718279b6e1d6bc27a701db47c1be720b5907.zip
op-kernel-dev-859d718279b6e1d6bc27a701db47c1be720b5907.tar.gz
[XFS] get_bulkall() could return incorrect inode state
In the following scenario xfs_bulkstat() returns incorrect stale inode state: 1. File_A is created and its inode synced to disk. 2. File_A is unlinked and doesn't exist anymore. 3. Filesystem sync is invoked. 4. File_B is created. File_B happens to reclaim File_A's inode. 5. xfs_bulkstat() is called and detects File_B but reports the incorrect File_A inode state. Explanation for the incorrect inode state is that inodes are not immediately synced on file create for performance reasons. This leaves the on-disk inode buffer uninitialized (or with old state from a previous generation inode) and this is what xfs_bulkstat() would report. The patch marks the on-disk inode buffer "dirty" on unlink. When the inode is reclaimed (by a new file create), xfs_bulkstat() would filter this inode by the "dirty" mark. Once the inode is flushed to disk, the on-disk buffer "dirty" mark is automatically removed and a following xfs_bulkstat() would return the correct inode state. Marking the on-disk inode buffer "dirty" on unlink is achieved by setting the on-disk di_nlink field to 0. Note that the in-core di_nlink has already been set to 0 and a corresponding transaction logged by xfs_droplink(). This is an exception from the rule that any on-disk inode buffer changes has to be followed by a disk write (inode flush). Synchronizing the in-core to on-disk di_nlink values in advance (before the actual inode flush to disk) should be fine in this case because the inode is already unlinked and it would never change its di_nlink again for this inode generation. SGI-PV: 970842 SGI-Modid: xfs-linux-melb:xfs-kern:29757a Signed-off-by: Vlad Apostolov <vapo@sgi.com> Signed-off-by: Alex Elder <aelder@sgi.com> Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Mark Goodwin <markgw@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_inode.c26
-rw-r--r--fs/xfs/xfs_itable.c10
2 files changed, 29 insertions, 7 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 3d8ba8f..abf509a 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1931,9 +1931,9 @@ xfs_iunlink(
*/
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, agdaddr,
XFS_FSS_TO_BB(mp, 1), 0, &agibp);
- if (error) {
+ if (error)
return error;
- }
+
/*
* Validate the magic number of the agi block.
*/
@@ -1957,6 +1957,24 @@ xfs_iunlink(
ASSERT(agi->agi_unlinked[bucket_index]);
ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
+ error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0);
+ if (error)
+ return error;
+
+ /*
+ * Clear the on-disk di_nlink. This is to prevent xfs_bulkstat
+ * from picking up this inode when it is reclaimed (its incore state
+ * initialzed but not flushed to disk yet). The in-core di_nlink is
+ * already cleared in xfs_droplink() and a corresponding transaction
+ * logged. The hack here just synchronizes the in-core to on-disk
+ * di_nlink value in advance before the actual inode sync to disk.
+ * This is OK because the inode is already unlinked and would never
+ * change its di_nlink again for this inode generation.
+ * This is a temporary hack that would require a proper fix
+ * in the future.
+ */
+ dip->di_core.di_nlink = 0;
+
if (be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO) {
/*
* There is already another inode in the bucket we need
@@ -1964,10 +1982,6 @@ xfs_iunlink(
* Here we put the head pointer into our next pointer,
* and then we fall through to point the head at us.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0);
- if (error) {
- return error;
- }
ASSERT(be32_to_cpu(dip->di_next_unlinked) == NULLAGINO);
/* both on-disk, don't endian flip twice */
dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index efeeafe..1edd9af 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -290,8 +290,16 @@ xfs_bulkstat_use_dinode(
return 1;
dip = (xfs_dinode_t *)
xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
+ /*
+ * Check the buffer containing the on-disk inode for di_nlink == 0.
+ * This is to prevent xfs_bulkstat from picking up just reclaimed
+ * inodes that have their in-core state initialized but not flushed
+ * to disk yet. This is a temporary hack that would require a proper
+ * fix in the future.
+ */
if (be16_to_cpu(dip->di_core.di_magic) != XFS_DINODE_MAGIC ||
- !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version))
+ !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version) ||
+ !dip->di_core.di_nlink)
return 0;
if (flags & BULKSTAT_FG_QUICK) {
*dipp = dip;
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