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Bug fixes for 6.10-rc5:

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* Fix assertion failure due to a race between unlink and cluster buffer
     instantiation.
 
 Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
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Merge tag 'xfs-6.10-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fix from Chandan Babu:

 - Fix assertion failure due to a race between unlink and cluster buffer
   instantiation.

* tag 'xfs-6.10-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: fix unlink vs cluster buffer instantiation race
This commit is contained in:
Linus Torvalds 2024-06-22 09:07:56 -07:00
commit 563a50672d
1 changed files with 19 additions and 4 deletions
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23
fs/xfs/xfs_inode.c
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@ -2548,11 +2548,26 @@ xfs_ifree_cluster(
* This buffer may not have been correctly initialised as we
* didn't read it from disk. That's not important because we are
* only using to mark the buffer as stale in the log, and to
* attach stale cached inodes on it. That means it will never be
* dispatched for IO. If it is, we want to know about it, and we
* want it to fail. We can acheive this by adding a write
* verifier to the buffer.
* attach stale cached inodes on it.
*
* For the inode that triggered the cluster freeing, this
* attachment may occur in xfs_inode_item_precommit() after we
* have marked this buffer stale. If this buffer was not in
* memory before xfs_ifree_cluster() started, it will not be
* marked XBF_DONE and this will cause problems later in
* xfs_inode_item_precommit() when we trip over a (stale, !done)
* buffer to attached to the transaction.
*
* Hence we have to mark the buffer as XFS_DONE here. This is
* safe because we are also marking the buffer as XBF_STALE and
* XFS_BLI_STALE. That means it will never be dispatched for
* IO and it won't be unlocked until the cluster freeing has
* been committed to the journal and the buffer unpinned. If it
* is written, we want to know about it, and we want it to
* fail. We can acheive this by adding a write verifier to the
* buffer.
*/
bp->b_flags |= XBF_DONE;
bp->b_ops = &xfs_inode_buf_ops;
/*