filelock: new helper: vfs_inode_has_locks

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[ Upstream commit ab1ddef98a ]

Ceph has a need to know whether a particular inode has any locks set on
it. It's currently tracking that by a num_locks field in its
filp->private_data, but that's problematic as it tries to decrement this
field when releasing locks and that can race with the file being torn
down.

Add a new vfs_inode_has_locks helper that just returns whether any locks
are currently held on the inode.

Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Stable-dep-of: 461ab10ef7 ("ceph: switch to vfs_inode_has_locks() to fix file lock bug")
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Jeff Layton 2022-11-14 08:33:09 -05:00 • committed by Greg Kroah-Hartman

parent b8e3dd2eba

commit 516fac1e07

2 changed files with 29 additions and 0 deletions

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23

fs/locks.c

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6

include/linux/fs.h

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