summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorNeilBrown <neilb@suse.com>2018-11-30 00:04:08 +0100
committerJeff Layton <jlayton@kernel.org>2018-11-30 17:26:12 +0100
commitd6367d6241371566597c9ab6efe4de0abf254eed (patch)
tree9c7443570a1cd0bb05d2ddfbcb16b2383851cc35
parentocfs2: properly initial file_lock used for unlock. (diff)
downloadlinux-d6367d6241371566597c9ab6efe4de0abf254eed.tar.xz
linux-d6367d6241371566597c9ab6efe4de0abf254eed.zip
fs/locks: use properly initialized file_lock when unlocking.
Both locks_remove_posix() and locks_remove_flock() use a struct file_lock without calling locks_init_lock() on it. This means the various list_heads are not initialized, which will become a problem with a later patch. So change them both to initialize properly. For flock locks, this involves using flock_make_lock(), and changing it to allow a file_lock to be passed in, so memory allocation isn't always needed. Signed-off-by: NeilBrown <neilb@suse.com> Reviewed-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Jeff Layton <jlayton@kernel.org>
-rw-r--r--fs/locks.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 6adb22a21a92..492d970c67d7 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -418,17 +418,20 @@ static inline int flock_translate_cmd(int cmd) {
/* Fill in a file_lock structure with an appropriate FLOCK lock. */
static struct file_lock *
-flock_make_lock(struct file *filp, unsigned int cmd)
+flock_make_lock(struct file *filp, unsigned int cmd, struct file_lock *fl)
{
- struct file_lock *fl;
int type = flock_translate_cmd(cmd);
if (type < 0)
return ERR_PTR(type);
- fl = locks_alloc_lock();
- if (fl == NULL)
- return ERR_PTR(-ENOMEM);
+ if (fl == NULL) {
+ fl = locks_alloc_lock();
+ if (fl == NULL)
+ return ERR_PTR(-ENOMEM);
+ } else {
+ locks_init_lock(fl);
+ }
fl->fl_file = filp;
fl->fl_owner = filp;
@@ -2009,7 +2012,7 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
!(f.file->f_mode & (FMODE_READ|FMODE_WRITE)))
goto out_putf;
- lock = flock_make_lock(f.file, cmd);
+ lock = flock_make_lock(f.file, cmd, NULL);
if (IS_ERR(lock)) {
error = PTR_ERR(lock);
goto out_putf;
@@ -2484,6 +2487,7 @@ void locks_remove_posix(struct file *filp, fl_owner_t owner)
if (!ctx || list_empty(&ctx->flc_posix))
return;
+ locks_init_lock(&lock);
lock.fl_type = F_UNLCK;
lock.fl_flags = FL_POSIX | FL_CLOSE;
lock.fl_start = 0;
@@ -2507,19 +2511,15 @@ EXPORT_SYMBOL(locks_remove_posix);
static void
locks_remove_flock(struct file *filp, struct file_lock_context *flctx)
{
- struct file_lock fl = {
- .fl_owner = filp,
- .fl_pid = current->tgid,
- .fl_file = filp,
- .fl_flags = FL_FLOCK | FL_CLOSE,
- .fl_type = F_UNLCK,
- .fl_end = OFFSET_MAX,
- };
+ struct file_lock fl;
struct inode *inode = locks_inode(filp);
if (list_empty(&flctx->flc_flock))
return;
+ flock_make_lock(filp, LOCK_UN, &fl);
+ fl.fl_flags |= FL_CLOSE;
+
if (filp->f_op->flock)
filp->f_op->flock(filp, F_SETLKW, &fl);
else