diff options
| -rw-r--r-- | fs/locks.c | 38 | ||||
| -rw-r--r-- | include/linux/fs.h | 1 |
2 files changed, 26 insertions, 13 deletions
diff --git a/fs/locks.c b/fs/locks.c index 749a0dc7cd4b..a31648e3ec1b 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -1611,6 +1611,24 @@ asmlinkage long sys_flock(unsigned int fd, unsigned int cmd) return error; } +/** + * vfs_test_lock - test file byte range lock + * @filp: The file to test lock for + * @fl: The lock to test + * @conf: Place to return a copy of the conflicting lock, if found + * + * Returns -ERRNO on failure. Indicates presence of conflicting lock by + * setting conf->fl_type to something other than F_UNLCK. + */ +int vfs_test_lock(struct file *filp, struct file_lock *fl) +{ + if (filp->f_op && filp->f_op->lock) + return filp->f_op->lock(filp, F_GETLK, fl); + posix_test_lock(filp, fl); + return 0; +} +EXPORT_SYMBOL_GPL(vfs_test_lock); + static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl) { flock->l_pid = fl->fl_pid; @@ -1663,12 +1681,9 @@ int fcntl_getlk(struct file *filp, struct flock __user *l) if (error) goto out; - if (filp->f_op && filp->f_op->lock) { - error = filp->f_op->lock(filp, F_GETLK, &file_lock); - if (error < 0) - goto out; - } else - posix_test_lock(filp, &file_lock); + error = vfs_test_lock(filp, &file_lock); + if (error) + goto out; flock.l_type = file_lock.fl_type; if (file_lock.fl_type != F_UNLCK) { @@ -1797,13 +1812,10 @@ int fcntl_getlk64(struct file *filp, struct flock64 __user *l) if (error) goto out; - if (filp->f_op && filp->f_op->lock) { - error = filp->f_op->lock(filp, F_GETLK, &file_lock); - if (error < 0) - goto out; - } else - posix_test_lock(filp, &file_lock); - + error = vfs_test_lock(filp, &file_lock); + if (error) + goto out; + flock.l_type = file_lock.fl_type; if (file_lock.fl_type != F_UNLCK) posix_lock_to_flock64(&flock, &file_lock); diff --git a/include/linux/fs.h b/include/linux/fs.h index 9e1ddffe3884..2a2a43988f50 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -856,6 +856,7 @@ extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_l extern int posix_lock_file(struct file *, struct file_lock *); extern int posix_lock_file_wait(struct file *, struct file_lock *); extern int posix_unblock_lock(struct file *, struct file_lock *); +extern int vfs_test_lock(struct file *, struct file_lock *); extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); extern int __break_lease(struct inode *inode, unsigned int flags); extern void lease_get_mtime(struct inode *, struct timespec *time); |