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xfs: Refactor xfs_isilocked()

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Introduce a new __xfs_rwsem_islocked predicate to encapsulate checking
the state of a rw_semaphore, then refactor xfs_isilocked to use it.

Signed-off-by: Pavel Reichl <preichl@redhat.com>
Suggested-by: Dave Chinner <dchinner@redhat.com>
Suggested-by: Eric Sandeen <sandeen@redhat.com>
Suggested-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Pavel Reichl 2020-10-16 04:10:02 +02:00 committed by Jan Kara
parent 70f3bad8c3
commit e31cbde7ec
2 changed files with 27 additions and 9 deletions
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34
fs/xfs/xfs_inode.c
View File

@ -343,9 +343,29 @@ xfs_ilock_demote(
}
#if defined(DEBUG) || defined(XFS_WARN)
int
static inline bool
__xfs_rwsem_islocked(
struct rw_semaphore *rwsem,
bool shared)
{
if (!debug_locks)
return rwsem_is_locked(rwsem);
if (!shared)
return lockdep_is_held_type(rwsem, 0);
/*
* We are checking that the lock is held at least in shared
* mode but don't care that it might be held exclusively
* (i.e. shared | excl). Hence we check if the lock is held
* in any mode rather than an explicit shared mode.
*/
return lockdep_is_held_type(rwsem, -1);
}
bool
xfs_isilocked(
xfs_inode_t *ip,
struct xfs_inode *ip,
uint lock_flags)
{
if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
@ -360,15 +380,13 @@ xfs_isilocked(
return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
}
if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
if (!(lock_flags & XFS_IOLOCK_SHARED))
return !debug_locks ||
lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0);
return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) {
return __xfs_rwsem_islocked(&VFS_I(ip)->i_rwsem,
(lock_flags & XFS_IOLOCK_SHARED));
}
ASSERT(0);
return 0;
return false;
}
#endif

2
fs/xfs/xfs_inode.h
View File

@ -410,7 +410,7 @@ void xfs_ilock(xfs_inode_t *, uint);
int xfs_ilock_nowait(xfs_inode_t *, uint);
void xfs_iunlock(xfs_inode_t *, uint);
void xfs_ilock_demote(xfs_inode_t *, uint);
int xfs_isilocked(xfs_inode_t *, uint);
bool xfs_isilocked(struct xfs_inode *, uint);
uint xfs_ilock_data_map_shared(struct xfs_inode *);
uint xfs_ilock_attr_map_shared(struct xfs_inode *);