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proc: Update proc_flush_task_mnt to use d_invalidate 

Now that d_invalidate always succeeds and flushes mount points use
it in stead of a combination of shrink_dcache_parent and d_drop
in proc_flush_task_mnt.  This removes the danger of a mount point
under /proc/<pid>/... becoming unreachable after the d_drop.

Reviewed-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Eric W. Biederman 2014-02-13 10:24:23 -08:00 committed by Al Viro
parent c143c2333c
commit bbd5192412
1 changed files with 2 additions and 4 deletions
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6
fs/proc/base.c
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@ -2639,8 +2639,7 @@ static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
/* no ->d_hash() rejects on procfs */ /* no ->d_hash() rejects on procfs */
dentry = d_hash_and_lookup(mnt->mnt_root, &name); dentry = d_hash_and_lookup(mnt->mnt_root, &name);
if (dentry) { if (dentry) {
shrink_dcache_parent(dentry); d_invalidate(dentry);
d_drop(dentry);
dput(dentry); dput(dentry);
} }
@ -2660,8 +2659,7 @@ static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
name.len = snprintf(buf, sizeof(buf), "%d", pid); name.len = snprintf(buf, sizeof(buf), "%d", pid);
dentry = d_hash_and_lookup(dir, &name); dentry = d_hash_and_lookup(dir, &name);
if (dentry) { if (dentry) {
shrink_dcache_parent(dentry); d_invalidate(dentry);
d_drop(dentry);
dput(dentry); dput(dentry);
} }