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authorBenjamin Coddington <bcodding@redhat.com>2017-07-16 17:28:21 +0300
committerJeff Layton <jlayton@redhat.com>2017-07-16 17:28:21 +0300
commit52306e882f77d3fd73f91435c41373d634acc5d2 (patch)
tree31be579b3aa1a962de4ad73eb4e7ddbde911a11e /fs/locks.c
parent5771a8c08880cdca3bfb4a3fc6d309d6bba20877 (diff)
downloadlinux-52306e882f77d3fd73f91435c41373d634acc5d2.tar.xz
fs/locks: Use allocation rather than the stack in fcntl_getlk()
Struct file_lock is fairly large, so let's save some space on the stack by using an allocation for struct file_lock in fcntl_getlk(), just as we do for fcntl_setlk(). Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Jeff Layton <jlayton@redhat.com>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c46
1 files changed, 26 insertions, 20 deletions
diff --git a/fs/locks.c b/fs/locks.c
index afefeb4ad6de..d7daa6c8932f 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2086,14 +2086,17 @@ static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
*/
int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
{
- struct file_lock file_lock;
+ struct file_lock *fl;
int error;
+ fl = locks_alloc_lock();
+ if (fl == NULL)
+ return -ENOMEM;
error = -EINVAL;
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
goto out;
- error = flock_to_posix_lock(filp, &file_lock, flock);
+ error = flock_to_posix_lock(filp, fl, flock);
if (error)
goto out;
@@ -2103,23 +2106,22 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
goto out;
cmd = F_GETLK;
- file_lock.fl_flags |= FL_OFDLCK;
- file_lock.fl_owner = filp;
+ fl->fl_flags |= FL_OFDLCK;
+ fl->fl_owner = filp;
}
- error = vfs_test_lock(filp, &file_lock);
+ error = vfs_test_lock(filp, fl);
if (error)
goto out;
- flock->l_type = file_lock.fl_type;
- if (file_lock.fl_type != F_UNLCK) {
- error = posix_lock_to_flock(flock, &file_lock);
+ flock->l_type = fl->fl_type;
+ if (fl->fl_type != F_UNLCK) {
+ error = posix_lock_to_flock(flock, fl);
if (error)
- goto rel_priv;
+ goto out;
}
-rel_priv:
- locks_release_private(&file_lock);
out:
+ locks_free_lock(fl);
return error;
}
@@ -2298,14 +2300,18 @@ out:
*/
int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
{
- struct file_lock file_lock;
+ struct file_lock *fl;
int error;
+ fl = locks_alloc_lock();
+ if (fl == NULL)
+ return -ENOMEM;
+
error = -EINVAL;
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
goto out;
- error = flock64_to_posix_lock(filp, &file_lock, flock);
+ error = flock64_to_posix_lock(filp, fl, flock);
if (error)
goto out;
@@ -2315,20 +2321,20 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
goto out;
cmd = F_GETLK64;
- file_lock.fl_flags |= FL_OFDLCK;
- file_lock.fl_owner = filp;
+ fl->fl_flags |= FL_OFDLCK;
+ fl->fl_owner = filp;
}
- error = vfs_test_lock(filp, &file_lock);
+ error = vfs_test_lock(filp, fl);
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);
+ flock->l_type = fl->fl_type;
+ if (fl->fl_type != F_UNLCK)
+ posix_lock_to_flock64(flock, fl);
- locks_release_private(&file_lock);
out:
+ locks_free_lock(fl);
return error;
}