After commit 766c4cbf "namei: d_is_negative() should be checked before ->d_seq validation", lookup_fast() can return -ENOENT without revalidating the negative dentry. This breaks network filesystems that allow creating/deleting files from multiple hosts. Signed-off-by: Yan, Zheng <zyan@xxxxxxxxxx> --- fs/namei.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 726d211..5ffbf53 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1558,8 +1558,6 @@ static int lookup_fast(struct nameidata *nd, negative = d_is_negative(dentry); if (read_seqcount_retry(&dentry->d_seq, seq)) return -ECHILD; - if (negative) - return -ENOENT; /* * This sequence count validates that the parent had no @@ -1580,6 +1578,10 @@ static int lookup_fast(struct nameidata *nd, goto unlazy; } } + + if (negative) + return -ENOENT; + path->mnt = mnt; path->dentry = dentry; if (likely(__follow_mount_rcu(nd, path, inode, seqp))) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
