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VFS: Fix __posix_lock_file() copy of private lock area 

The struct file_lock->fl_u area must be copied using the fl_copy_lock()
operation.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-03-20 13:44:05 -05:00
parent 1dd594b21b
commit 47831f35b8
1 changed files with 36 additions and 17 deletions
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53
fs/locks.c
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@ -153,6 +153,21 @@ static struct file_lock *locks_alloc_lock(void)
return kmem_cache_alloc(filelock_cache, SLAB_KERNEL);
}
static void locks_release_private(struct file_lock *fl)
{
if (fl->fl_ops) {
if (fl->fl_ops->fl_release_private)
fl->fl_ops->fl_release_private(fl);
fl->fl_ops = NULL;
}
if (fl->fl_lmops) {
if (fl->fl_lmops->fl_release_private)
fl->fl_lmops->fl_release_private(fl);
fl->fl_lmops = NULL;
}
}
/* Free a lock which is not in use. */
static void locks_free_lock(struct file_lock *fl)
{
@ -169,18 +184,7 @@ static void locks_free_lock(struct file_lock *fl)
if (!list_empty(&fl->fl_link))
panic("Attempting to free lock on active lock list");
if (fl->fl_ops) {
if (fl->fl_ops->fl_release_private)
fl->fl_ops->fl_release_private(fl);
fl->fl_ops = NULL;
}
if (fl->fl_lmops) {
if (fl->fl_lmops->fl_release_private)
fl->fl_lmops->fl_release_private(fl);
fl->fl_lmops = NULL;
}
locks_release_private(fl);
kmem_cache_free(filelock_cache, fl);
}
@ -218,11 +222,27 @@ static void init_once(void *foo, kmem_cache_t *cache, unsigned long flags)
locks_init_lock(lock);
}
static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
{
if (fl->fl_ops) {
if (fl->fl_ops->fl_copy_lock)
fl->fl_ops->fl_copy_lock(new, fl);
new->fl_ops = fl->fl_ops;
}
if (fl->fl_lmops) {
if (fl->fl_lmops->fl_copy_lock)
fl->fl_lmops->fl_copy_lock(new, fl);
new->fl_lmops = fl->fl_lmops;
}
}
/*
* Initialize a new lock from an existing file_lock structure.
*/
void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
locks_release_private(new);
new->fl_owner = fl->fl_owner;
new->fl_pid = fl->fl_pid;
new->fl_file = fl->fl_file;
@ -232,10 +252,8 @@ void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
new->fl_end = fl->fl_end;
new->fl_ops = fl->fl_ops;
new->fl_lmops = fl->fl_lmops;
if (fl->fl_ops && fl->fl_ops->fl_copy_lock)
fl->fl_ops->fl_copy_lock(new, fl);
if (fl->fl_lmops && fl->fl_lmops->fl_copy_lock)
fl->fl_lmops->fl_copy_lock(new, fl);
locks_copy_private(new, fl);
}
EXPORT_SYMBOL(locks_copy_lock);
@ -904,7 +922,8 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request)
fl->fl_start = request->fl_start;
fl->fl_end = request->fl_end;
fl->fl_type = request->fl_type;
fl->fl_u = request->fl_u;
locks_release_private(fl);
locks_copy_private(fl, request);
request = fl;
added = 1;
}