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| author | Al Viro <viro@zeniv.linux.org.uk> | 2019-09-17 22:16:58 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-09-17 22:16:58 -0400 |
| commit | e509d6e9c1ab54af257d4ed95b30d41e3d786857 (patch) | |
| tree | 83e69fbfdd7eb7cebfc21cddbf107b38c5762dac /fs/autofs | |
| parent | 5f68056ca50fdd3954a93ae66fea7452abddb66f (diff) | |
| download | linux-e509d6e9c1ab54af257d4ed95b30d41e3d786857.tar.bz2 | |
autofs_clear_leaf_automount_flags(): use ino->count instead of ->d_subdirs
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>
Diffstat (limited to 'fs/autofs')
| -rw-r--r-- | fs/autofs/root.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/fs/autofs/root.c b/fs/autofs/root.c index 29abafc0ce31..2065281ee8b1 100644 --- a/fs/autofs/root.c +++ b/fs/autofs/root.c @@ -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); } |