Commit 591502c5 authored by Dai Ngo's avatar Dai Ngo Committed by Chuck Lever

fs/lock: add helper locks_owner_has_blockers to check for blockers

Add helper locks_owner_has_blockers to check if there is any blockers
for a given lockowner.
Reviewed-by: default avatarJ. Bruce Fields <bfields@fieldses.org>
Signed-off-by: default avatarDai Ngo <dai.ngo@oracle.com>
Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
parent d76cc46b
...@@ -300,6 +300,34 @@ void locks_release_private(struct file_lock *fl) ...@@ -300,6 +300,34 @@ void locks_release_private(struct file_lock *fl)
} }
EXPORT_SYMBOL_GPL(locks_release_private); EXPORT_SYMBOL_GPL(locks_release_private);
/**
* locks_owner_has_blockers - Check for blocking lock requests
* @flctx: file lock context
* @owner: lock owner
*
* Return values:
* %true: @owner has at least one blocker
* %false: @owner has no blockers
*/
bool locks_owner_has_blockers(struct file_lock_context *flctx,
fl_owner_t owner)
{
struct file_lock *fl;
spin_lock(&flctx->flc_lock);
list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
if (fl->fl_owner != owner)
continue;
if (!list_empty(&fl->fl_blocked_requests)) {
spin_unlock(&flctx->flc_lock);
return true;
}
}
spin_unlock(&flctx->flc_lock);
return false;
}
EXPORT_SYMBOL_GPL(locks_owner_has_blockers);
/* Free a lock which is not in use. */ /* Free a lock which is not in use. */
void locks_free_lock(struct file_lock *fl) void locks_free_lock(struct file_lock *fl)
{ {
......
...@@ -1174,6 +1174,8 @@ extern void lease_unregister_notifier(struct notifier_block *); ...@@ -1174,6 +1174,8 @@ extern void lease_unregister_notifier(struct notifier_block *);
struct files_struct; struct files_struct;
extern void show_fd_locks(struct seq_file *f, extern void show_fd_locks(struct seq_file *f,
struct file *filp, struct files_struct *files); struct file *filp, struct files_struct *files);
extern bool locks_owner_has_blockers(struct file_lock_context *flctx,
fl_owner_t owner);
#else /* !CONFIG_FILE_LOCKING */ #else /* !CONFIG_FILE_LOCKING */
static inline int fcntl_getlk(struct file *file, unsigned int cmd, static inline int fcntl_getlk(struct file *file, unsigned int cmd,
struct flock __user *user) struct flock __user *user)
...@@ -1309,6 +1311,11 @@ static inline int lease_modify(struct file_lock *fl, int arg, ...@@ -1309,6 +1311,11 @@ static inline int lease_modify(struct file_lock *fl, int arg,
struct files_struct; struct files_struct;
static inline void show_fd_locks(struct seq_file *f, static inline void show_fd_locks(struct seq_file *f,
struct file *filp, struct files_struct *files) {} struct file *filp, struct files_struct *files) {}
static inline bool locks_owner_has_blockers(struct file_lock_context *flctx,
fl_owner_t owner)
{
return false;
}
#endif /* !CONFIG_FILE_LOCKING */ #endif /* !CONFIG_FILE_LOCKING */
static inline struct inode *file_inode(const struct file *f) static inline struct inode *file_inode(const struct file *f)
......
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