[PATCH 3/4] locks: fix setlease methods to free passed-in lock

J. Bruce Fields
2010-10-30T21:31:40Z

We modified setlease to require the caller to allocate the new lease in
the case of creating a new lease, but forgot to fix up the filesystem
methods.

Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Steve French <sfrench@samba.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
fs/cifs/cifsfs.c | 5 ++++-
fs/gfs2/file.c | 2 ++
fs/locks.c | 3 ++-
fs/nfs/file.c | 3 ++-
include/linux/fs.h | 1 +
5 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 75c4eaa..54745b6 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -625,8 +625,11 @@ static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
knows that the file won't be changed on the server
by anyone else */
return generic_setlease(file, arg, lease);
- else
+ else {
+ if (arg != F_UNLCK)
+ locks_free_lock(*lease);
return -EAGAIN;
+ }
}

struct file_system_type cifs_fs_type = {
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index aa99647..ac943c1 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -629,6 +629,8 @@ static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,

static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
{
+ if (arg != F_UNLCK)
+ locks_free_lock(*fl);
return -EINVAL;
}

diff --git a/fs/locks.c b/fs/locks.c
index 63fbc41..5b526a9 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -186,7 +186,7 @@ void locks_release_private(struct file_lock *fl)
EXPORT_SYMBOL_GPL(locks_release_private);

/* Free a lock which is not in use. */
-static void locks_free_lock(struct file_lock *fl)
+void locks_free_lock(struct file_lock *fl)
{
BUG_ON(waitqueue_active(&fl->fl_wait));
BUG_ON(!list_empty(&fl->fl_block));
@@ -195,6 +195,7 @@ static void locks_free_lock(struct file_lock *fl)
locks_release_private(fl);
kmem_cache_free(filelock_cache, fl);
}
+EXPORT_SYMBOL(locks_free_lock);

void locks_init_lock(struct file_lock *fl)
{
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index e756075..1e524fb 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -884,6 +884,7 @@ static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
file->f_path.dentry->d_parent->d_name.name,
file->f_path.dentry->d_name.name, arg);
-
+ if (arg != F_UNLCK)
+ locks_free_lock(*fl);
return -EINVAL;
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7b7b507..1eb2939 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1129,6 +1129,7 @@ extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
extern int fcntl_getlease(struct file *filp);

/* fs/locks.c */
+void locks_free_lock(struct file_lock *fl);
extern void locks_init_lock(struct file_lock *);
extern struct file_lock * locks_alloc_lock(void);
extern void locks_copy_lock(struct file_lock *, struct file_lock *);
--
1.7.1