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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-04-14 19:33:34 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-05-02 19:47:26 -0400 |
| commit | 1936386ea96591c27ae4b70caef9591c41e6290f (patch) | |
| tree | 1cb793a9f7621bff82219d64c7f9813a23ebee69 | |
| parent | d2caaa0a7745eed3a827e919a37470d34b8fc20d (diff) | |
| download | linux-stable-1936386ea96591c27ae4b70caef9591c41e6290f.tar.gz linux-stable-1936386ea96591c27ae4b70caef9591c41e6290f.tar.bz2 linux-stable-1936386ea96591c27ae4b70caef9591c41e6290f.zip | |
lookup_slow(): bugger off on IS_DEADDIR() from the very beginning
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/namei.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/fs/namei.c b/fs/namei.c index bdcea8a018b8..c275635c4b9e 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1603,8 +1603,15 @@ static struct dentry *lookup_slow(const struct qstr *name, struct dentry *dir, unsigned int flags) { - struct dentry *dentry; - inode_lock(dir->d_inode); + struct dentry *dentry, *old; + struct inode *inode = dir->d_inode; + + inode_lock(inode); + /* Don't go there if it's already dead */ + if (unlikely(IS_DEADDIR(inode))) { + inode_unlock(inode); + return ERR_PTR(-ENOENT); + } dentry = d_lookup(dir, name); if (unlikely(dentry)) { if ((dentry->d_flags & DCACHE_OP_REVALIDATE) && @@ -1618,17 +1625,21 @@ static struct dentry *lookup_slow(const struct qstr *name, } } if (dentry) { - inode_unlock(dir->d_inode); + inode_unlock(inode); return dentry; } } dentry = d_alloc(dir, name); if (unlikely(!dentry)) { - inode_unlock(dir->d_inode); + inode_unlock(inode); return ERR_PTR(-ENOMEM); } - dentry = lookup_real(dir->d_inode, dentry, flags); - inode_unlock(dir->d_inode); + old = inode->i_op->lookup(inode, dentry, flags); + if (unlikely(old)) { + dput(dentry); + dentry = old; + } + inode_unlock(inode); return dentry; } |