From 52306e882f77d3fd73f91435c41373d634acc5d2 Mon Sep 17 00:00:00 2001 From: Benjamin Coddington Date: Sun, 16 Jul 2017 10:28:21 -0400 Subject: [PATCH] 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 Signed-off-by: Jeff Layton --- fs/locks.c | 46 ++++++++++++++++++++++++++-------------------- 1 file 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; } -- 2.20.1