From ace74e797a82f7ded7912dfa285bd954cc66400d Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Thu, 8 Oct 2020 07:53:33 -0700 Subject: [PATCH] xfs: annotate grabbing the realtime bitmap/summary locks in growfs Use XFS_ILOCK_RT{BITMAP,SUM} to annotate grabbing the rt bitmap and summary locks when we grow the realtime volume, just like we do most everywhere else. This shuts up lockdep warnings about grabbing the ILOCK class of locks recursively: ============================================ WARNING: possible recursive locking detected 5.9.0-rc4-djw #rc4 Tainted: G O -------------------------------------------- xfs_growfs/4841 is trying to acquire lock: ffff888035acc230 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0xac/0x1a0 [xfs] but task is already holding lock: ffff888035acedb0 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0xac/0x1a0 [xfs] other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&xfs_nondir_ilock_class); lock(&xfs_nondir_ilock_class); *** DEADLOCK *** May be due to missing lock nesting notation Signed-off-by: Darrick J. Wong Reviewed-by: Chandan Babu R --- fs/xfs/xfs_rtalloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c index f9119ba3e9d0..ede1baf31413 100644 --- a/fs/xfs/xfs_rtalloc.c +++ b/fs/xfs/xfs_rtalloc.c @@ -1024,7 +1024,7 @@ xfs_growfs_rt( /* * Lock out other callers by grabbing the bitmap inode lock. */ - xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL); + xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP); xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL); /* * Update the bitmap inode's size ondisk and incore. We need @@ -1038,7 +1038,7 @@ xfs_growfs_rt( /* * Get the summary inode into the transaction. */ - xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL); + xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM); xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL); /* * Update the summary inode's size. We need to update the