fs/lock: add helper locks_owner_has_blockers to check for blockers
[ Upstream commit 591502c5cb
]
Add helper locks_owner_has_blockers to check if there is any blockers
for a given lockowner.
Reviewed-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Родитель
d9fc2f8267
Коммит
a8040fed13
28
fs/locks.c
28
fs/locks.c
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@ -376,6 +376,34 @@ void locks_release_private(struct file_lock *fl)
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}
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EXPORT_SYMBOL_GPL(locks_release_private);
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/**
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* locks_owner_has_blockers - Check for blocking lock requests
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* @flctx: file lock context
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* @owner: lock owner
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*
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* Return values:
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* %true: @owner has at least one blocker
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* %false: @owner has no blockers
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*/
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bool locks_owner_has_blockers(struct file_lock_context *flctx,
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fl_owner_t owner)
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{
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struct file_lock *fl;
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spin_lock(&flctx->flc_lock);
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list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
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if (fl->fl_owner != owner)
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continue;
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if (!list_empty(&fl->fl_blocked_requests)) {
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spin_unlock(&flctx->flc_lock);
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return true;
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}
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}
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spin_unlock(&flctx->flc_lock);
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return false;
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}
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EXPORT_SYMBOL_GPL(locks_owner_has_blockers);
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/* Free a lock which is not in use. */
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void locks_free_lock(struct file_lock *fl)
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{
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@ -1212,6 +1212,8 @@ extern void lease_unregister_notifier(struct notifier_block *);
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struct files_struct;
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extern void show_fd_locks(struct seq_file *f,
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struct file *filp, struct files_struct *files);
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extern bool locks_owner_has_blockers(struct file_lock_context *flctx,
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fl_owner_t owner);
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#else /* !CONFIG_FILE_LOCKING */
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static inline int fcntl_getlk(struct file *file, unsigned int cmd,
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struct flock __user *user)
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@ -1352,6 +1354,11 @@ static inline int lease_modify(struct file_lock *fl, int arg,
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struct files_struct;
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static inline void show_fd_locks(struct seq_file *f,
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struct file *filp, struct files_struct *files) {}
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static inline bool locks_owner_has_blockers(struct file_lock_context *flctx,
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fl_owner_t owner)
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{
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return false;
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}
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#endif /* !CONFIG_FILE_LOCKING */
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static inline struct inode *file_inode(const struct file *f)
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