Hi list,
Apparently, the following two C language constructs
while (condition) {
// DO HARD WORK
}
and
repeat:
if (condition) {
// DO HARD WORK
goto repeat;
}
are equivalent, but the latter one looks quite cumbersome and is not idiomatic. However, the mntput_no_expire() routine in fs/namespace.c is implemented using the goto-based approach.
The patch given below replaces the goto-loop by a while-based one. Besides, it removes the export for the same routine, because there are no users for it outside of the core VFS code.
Signed-off-by: Dmitri Vorobiev <[email protected]>
---
diff --git a/fs/namespace.c b/fs/namespace.c
index 0608388..38b4b4a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -278,8 +278,7 @@ static inline void __mntput(struct vfsmo
void mntput_no_expire(struct vfsmount *mnt)
{
-repeat:
- if (atomic_dec_and_lock(&mnt->mnt_count, &vfsmount_lock)) {
+ while (atomic_dec_and_lock(&mnt->mnt_count, &vfsmount_lock)) {
if (likely(!mnt->mnt_pinned)) {
spin_unlock(&vfsmount_lock);
__mntput(mnt);
@@ -290,12 +289,9 @@ repeat:
spin_unlock(&vfsmount_lock);
acct_auto_close_mnt(mnt);
security_sb_umount_close(mnt);
- goto repeat;
}
}
-EXPORT_SYMBOL(mntput_no_expire);
-
void mnt_pin(struct vfsmount *mnt)
{
spin_lock(&vfsmount_lock);
-
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