Commit 7723ec97 authored by Marc Eshel's avatar Marc Eshel Committed by J. Bruce Fields

locks: factor out generic/filesystem switch from setlock code

Factor out the code that switches between generic and filesystem-specific lock
methods; eventually we want to call this from lock managers (lockd and nfsd)
too; currently they only call the generic methods.

This patch does that for all the setlk code.
Signed-off-by: default avatarMarc Eshel <eshel@almaden.ibm.com>
Signed-off-by: default avatar"J. Bruce Fields" <bfields@citi.umich.edu>
parent 3ee17abd
......@@ -1698,6 +1698,21 @@ int fcntl_getlk(struct file *filp, struct flock __user *l)
return error;
}
/**
* vfs_lock_file - file byte range lock
* @filp: The file to apply the lock to
* @cmd: type of locking operation (F_SETLK, F_GETLK, etc.)
* @fl: The lock to be applied
*/
int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl)
{
if (filp->f_op && filp->f_op->lock)
return filp->f_op->lock(filp, cmd, fl);
else
return posix_lock_file(filp, fl);
}
EXPORT_SYMBOL_GPL(vfs_lock_file);
/* Apply the lock described by l to an open file descriptor.
* This implements both the F_SETLK and F_SETLKW commands of fcntl().
*/
......@@ -1760,11 +1775,8 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
if (error)
goto out;
if (filp->f_op && filp->f_op->lock != NULL)
error = filp->f_op->lock(filp, cmd, file_lock);
else {
for (;;) {
error = posix_lock_file(filp, file_lock);
error = vfs_lock_file(filp, cmd, file_lock);
if (error != -EAGAIN || cmd == F_SETLK)
break;
error = wait_event_interruptible(file_lock->fl_wait,
......@@ -1775,7 +1787,6 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
locks_delete_block(file_lock);
break;
}
}
/*
* Attempt to detect a close/fcntl race and recover by
......@@ -1890,11 +1901,8 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
if (error)
goto out;
if (filp->f_op && filp->f_op->lock != NULL)
error = filp->f_op->lock(filp, cmd, file_lock);
else {
for (;;) {
error = posix_lock_file(filp, file_lock);
error = vfs_lock_file(filp, cmd, file_lock);
if (error != -EAGAIN || cmd == F_SETLK64)
break;
error = wait_event_interruptible(file_lock->fl_wait,
......@@ -1905,7 +1913,6 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
locks_delete_block(file_lock);
break;
}
}
/*
* Attempt to detect a close/fcntl race and recover by
......@@ -1949,10 +1956,7 @@ void locks_remove_posix(struct file *filp, fl_owner_t owner)
lock.fl_ops = NULL;
lock.fl_lmops = NULL;
if (filp->f_op && filp->f_op->lock != NULL)
filp->f_op->lock(filp, F_SETLK, &lock);
else
posix_lock_file(filp, &lock);
vfs_lock_file(filp, F_SETLK, &lock);
if (lock.fl_ops && lock.fl_ops->fl_release_private)
lock.fl_ops->fl_release_private(&lock);
......
......@@ -857,6 +857,7 @@ 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 vfs_lock_file(struct file *, unsigned int, 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);
......
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