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| author | Tejun Heo <tj@kernel.org> | 2019-11-04 15:54:29 -0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2019-11-12 08:18:03 -0800 |
| commit | e23f568aa63f64cd6b355094224cc9356c0f696b (patch) | |
| tree | fdefc12ecadf8a7677cf7230613a33d6e86e98e0 /fs/kernfs | |
| parent | d671fa6393d6788fc65555d4643b71cb3a361f36 (diff) | |
| download | lwn-e23f568aa63f64cd6b355094224cc9356c0f696b.tar.gz lwn-e23f568aa63f64cd6b355094224cc9356c0f696b.zip | |
kernfs: fix ino wrap-around detection
When the 32bit ino wraps around, kernfs increments the generation
number to distinguish reused ino instances. The wrap-around detection
tests whether the allocated ino is lower than what the cursor but the
cursor is pointing to the next ino to allocate so the condition never
triggers.
Fix it by remembering the last ino and comparing against that.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fixes: 4a3ef68acacf ("kernfs: implement i_generation")
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org # v4.14+
Diffstat (limited to 'fs/kernfs')
| -rw-r--r-- | fs/kernfs/dir.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 6ebae6bbe6a5..7d4af6cea2a6 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -622,7 +622,6 @@ static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root, { struct kernfs_node *kn; u32 gen; - int cursor; int ret; name = kstrdup_const(name, GFP_KERNEL); @@ -635,11 +634,11 @@ static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root, idr_preload(GFP_KERNEL); spin_lock(&kernfs_idr_lock); - cursor = idr_get_cursor(&root->ino_idr); ret = idr_alloc_cyclic(&root->ino_idr, kn, 1, 0, GFP_ATOMIC); - if (ret >= 0 && ret < cursor) + if (ret >= 0 && ret < root->last_ino) root->next_generation++; gen = root->next_generation; + root->last_ino = ret; spin_unlock(&kernfs_idr_lock); idr_preload_end(); if (ret < 0) |