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Date: Sat, 16 Apr 2016 01:55:21 +0100 From: Al Viro <viro@...IV.linux.org.uk> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: [PATCH 09/15] lookup_slow(): bugger off on IS_DEADDIR() from the very beginning From: Al Viro <viro@...iv.linux.org.uk> Signed-off-by: Al Viro <viro@...iv.linux.org.uk> --- fs/namei.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index c0d551f..6fb33a7 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; } -- 2.8.0.rc3
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