/*
* Protects the two list heads above, plus the inode->i_flock list
- * FIXME: should use a spinlock, once lockd and ceph are ready.
*/
void lock_flocks(void)
{
static struct kmem_cache *filelock_cache __read_mostly;
+static void locks_init_lock_heads(struct file_lock *fl)
+{
+ INIT_LIST_HEAD(&fl->fl_link);
+ INIT_LIST_HEAD(&fl->fl_block);
+ init_waitqueue_head(&fl->fl_wait);
+}
+
/* Allocate an empty lock structure. */
struct file_lock *locks_alloc_lock(void)
{
- return kmem_cache_alloc(filelock_cache, GFP_KERNEL);
+ struct file_lock *fl = kmem_cache_zalloc(filelock_cache, GFP_KERNEL);
+
+ if (fl)
+ locks_init_lock_heads(fl);
+
+ return fl;
}
EXPORT_SYMBOL_GPL(locks_alloc_lock);
fl->fl_ops = NULL;
}
if (fl->fl_lmops) {
- if (fl->fl_lmops->fl_release_private)
- fl->fl_lmops->fl_release_private(fl);
+ if (fl->fl_lmops->lm_release_private)
+ fl->fl_lmops->lm_release_private(fl);
fl->fl_lmops = NULL;
}
void locks_init_lock(struct file_lock *fl)
{
- INIT_LIST_HEAD(&fl->fl_link);
- INIT_LIST_HEAD(&fl->fl_block);
- init_waitqueue_head(&fl->fl_wait);
- fl->fl_next = NULL;
- fl->fl_fasync = NULL;
- fl->fl_owner = NULL;
- fl->fl_pid = 0;
- fl->fl_nspid = NULL;
- fl->fl_file = NULL;
- fl->fl_flags = 0;
- fl->fl_type = 0;
- fl->fl_start = fl->fl_end = 0;
- fl->fl_ops = NULL;
- fl->fl_lmops = NULL;
+ memset(fl, 0, sizeof(struct file_lock));
+ locks_init_lock_heads(fl);
}
EXPORT_SYMBOL(locks_init_lock);
-/*
- * Initialises the fields of the file lock which are invariant for
- * free file_locks.
- */
-static void init_once(void *foo)
-{
- struct file_lock *lock = (struct file_lock *) foo;
-
- locks_init_lock(lock);
-}
-
static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
{
if (fl->fl_ops) {
fl->fl_ops = NULL;
fl->fl_lmops = NULL;
- switch (l->l_type) {
- case F_RDLCK:
- case F_WRLCK:
- case F_UNLCK:
- fl->fl_type = l->l_type;
- break;
- default:
- return -EINVAL;
- }
-
- return (0);
+ return assign_type(fl, l->l_type);
}
#endif
fl->fl_file->f_owner.signum = 0;
}
-static int lease_mylease_callback(struct file_lock *fl, struct file_lock *try)
-{
- return fl->fl_file == try->fl_file;
-}
-
static const struct lock_manager_operations lease_manager_ops = {
- .fl_break = lease_break_callback,
- .fl_release_private = lease_release_private_callback,
- .fl_mylease = lease_mylease_callback,
- .fl_change = lease_modify,
+ .lm_break = lease_break_callback,
+ .lm_release_private = lease_release_private_callback,
+ .lm_change = lease_modify,
};
/*
*/
static int posix_same_owner(struct file_lock *fl1, struct file_lock *fl2)
{
- if (fl1->fl_lmops && fl1->fl_lmops->fl_compare_owner)
+ if (fl1->fl_lmops && fl1->fl_lmops->lm_compare_owner)
return fl2->fl_lmops == fl1->fl_lmops &&
- fl1->fl_lmops->fl_compare_owner(fl1, fl2);
+ fl1->fl_lmops->lm_compare_owner(fl1, fl2);
return fl1->fl_owner == fl2->fl_owner;
}
waiter = list_first_entry(&blocker->fl_block,
struct file_lock, fl_block);
__locks_delete_block(waiter);
- if (waiter->fl_lmops && waiter->fl_lmops->fl_notify)
- waiter->fl_lmops->fl_notify(waiter);
+ if (waiter->fl_lmops && waiter->fl_lmops->lm_notify)
+ waiter->fl_lmops->lm_notify(waiter);
else
wake_up(&waiter->fl_wait);
}
fl->fl_type = future;
fl->fl_break_time = break_time;
/* lease must have lmops break callback */
- fl->fl_lmops->fl_break(fl);
+ fl->fl_lmops->lm_break(fl);
}
}
* @arg: type of lease to obtain
* @flp: input - file_lock to use, output - file_lock inserted
*
- * The (input) flp->fl_lmops->fl_break function is required
+ * The (input) flp->fl_lmops->lm_break function is required
* by break_lease().
*
* Called with file_lock_lock held.
time_out_leases(inode);
- BUG_ON(!(*flp)->fl_lmops->fl_break);
+ BUG_ON(!(*flp)->fl_lmops->lm_break);
if (arg != F_UNLCK) {
error = -EAGAIN;
if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0))
goto out;
if ((arg == F_WRLCK)
- && ((atomic_read(&dentry->d_count) > 1)
+ && ((dentry->d_count > 1)
|| (atomic_read(&inode->i_count) > 1)))
goto out;
}
for (before = &inode->i_flock;
((fl = *before) != NULL) && IS_LEASE(fl);
before = &fl->fl_next) {
- if (lease->fl_lmops->fl_mylease(fl, lease))
+ if (fl->fl_file == filp)
my_before = before;
else if (fl->fl_type == (F_INPROGRESS | F_UNLCK))
/*
goto out;
if (my_before != NULL) {
- error = lease->fl_lmops->fl_change(my_before, arg);
+ error = lease->fl_lmops->lm_change(my_before, arg);
if (!error)
*flp = *my_before;
goto out;
* @lease: file_lock to use
*
* Call this to establish a lease on the file.
- * The (*lease)->fl_lmops->fl_break operation must be set; if not,
+ * The (*lease)->fl_lmops->lm_break operation must be set; if not,
* break_lease will oops!
*
* This will call the filesystem's setlease file method, if
* To avoid blocking kernel daemons, such as lockd, that need to acquire POSIX
* locks, the ->lock() interface may return asynchronously, before the lock has
* been granted or denied by the underlying filesystem, if (and only if)
- * fl_grant is set. Callers expecting ->lock() to return asynchronously
+ * lm_grant is set. Callers expecting ->lock() to return asynchronously
* will only use F_SETLK, not F_SETLKW; they will set FL_SLEEP if (and only if)
* the request is for a blocking lock. When ->lock() does return asynchronously,
- * it must return FILE_LOCK_DEFERRED, and call ->fl_grant() when the lock
+ * it must return FILE_LOCK_DEFERRED, and call ->lm_grant() when the lock
* request completes.
* If the request is for non-blocking lock the file system should return
* FILE_LOCK_DEFERRED then try to get the lock and call the callback routine
* grants a lock so the VFS can find out which locks are locally held and do
* the correct lock cleanup when required.
* The underlying filesystem must not drop the kernel lock or call
- * ->fl_grant() before returning to the caller with a FILE_LOCK_DEFERRED
+ * ->lm_grant() before returning to the caller with a FILE_LOCK_DEFERRED
* return code.
*/
int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl, struct file_lock *conf)
static int __init filelock_init(void)
{
filelock_cache = kmem_cache_create("file_lock_cache",
- sizeof(struct file_lock), 0, SLAB_PANIC,
- init_once);
+ sizeof(struct file_lock), 0, SLAB_PANIC, NULL);
+
return 0;
}
Code Review / linux-2.6.git / blobdiff