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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>
This commit is contained in:
Benjamin Coddington 2017-07-16 10:28:21 -04:00 committed by Jeff Layton
parent 5771a8c088
commit 52306e882f
1 changed files with 26 additions and 20 deletions
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46
fs/locks.c
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@ -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;
}