6.10-stable review patch. If anyone has any objections, please let me know.
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From: Dave Chinner dchinner@redhat.com
commit 95179935beadccaf0f0bb461adb778731e293da4 upstream.
As a result of the factoring in commit 14dd46cf31f4 ("xfs: split xfs_inobt_init_cursor"), mount started taking a long time on a user's filesystem. For Anders, this made mount times regress from under a second to over 15 minutes for a filesystem with only 30 million inodes in it.
Anders bisected it down to the above commit, but even then the bug was not obvious. In this commit, over 20 calls to xfs_inobt_init_cursor() were modified, and some we modified to call a new function named xfs_finobt_init_cursor().
If that takes you a moment to reread those function names to see what the rename was, then you have realised why this bug wasn't spotted during review. And it wasn't spotted on inspection even after the bisect pointed at this commit - a single missing "f" isn't the easiest thing for a human eye to notice....
The result is that xfs_finobt_count_blocks() now incorrectly calls xfs_inobt_init_cursor() so it is now walking the inobt instead of the finobt. Hence when there are lots of allocated inodes in a filesystem, mount takes a -long- time run because it now walks a massive allocated inode btrees instead of the small, nearly empty free inode btrees. It also means all the finobt space reservations are wrong, so mount could potentially given ENOSPC on kernel upgrade.
In hindsight, commit 14dd46cf31f4 should have been two commits - the first to convert the finobt callers to the new API, the second to modify the xfs_inobt_init_cursor() API for the inobt callers. That would have made the bug very obvious during review.
Fixes: 14dd46cf31f4 ("xfs: split xfs_inobt_init_cursor") Reported-by: Anders Blomdell anders.blomdell@gmail.com Signed-off-by: Dave Chinner dchinner@redhat.com Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Darrick J. Wong djwong@kernel.org Signed-off-by: Darrick J. Wong djwong@kernel.org Signed-off-by: Chandan Babu R chandanbabu@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/xfs/libxfs/xfs_ialloc_btree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/xfs/libxfs/xfs_ialloc_btree.c +++ b/fs/xfs/libxfs/xfs_ialloc_btree.c @@ -749,7 +749,7 @@ xfs_finobt_count_blocks( if (error) return error;
- cur = xfs_inobt_init_cursor(pag, tp, agbp); + cur = xfs_finobt_init_cursor(pag, tp, agbp); error = xfs_btree_count_blocks(cur, tree_blocks); xfs_btree_del_cursor(cur, error); xfs_trans_brelse(tp, agbp);