system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-20 19:17:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

autofs_clear_leaf_automount_flags(): use ino->count instead of ->d_subdirs

Browse source 
We want to find out if the parent will become empty after we remove
the victim of rmdir().  Checking if the victim is the only element
of parent's ->d_subdirs is completely wrong - e.g. opening the parent
will end up with a cursor added to its ->d_parent and fooling the
check.

We do maintain ino->count - 0 for anything removed, 1 + number of
children for anything live.  Which gives us precisely what we need
for that check...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-09-17 22:16:58 -04:00
parent 5f68056ca5
commit e509d6e9c1
1 changed files with 1 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
fs/autofs/root.c
View file

@ -660,7 +660,6 @@ static void autofs_set_leaf_automount_flags(struct dentry *dentry)
static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
{
struct list_head *d_child;
struct dentry *parent;
/* flags for dentrys in the root are handled elsewhere */
@ -673,10 +672,7 @@ static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
/* only consider parents below dentrys in the root */
if (IS_ROOT(parent->d_parent))
return;
d_child = &dentry->d_child;
/* Set parent managed if it's becoming empty */
if (d_child->next == &parent->d_subdirs &&
d_child->prev == &parent->d_subdirs)
if (atomic_read(&autofs_dentry_ino(parent)->count) == 2)
managed_dentry_set_managed(parent);
}