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lookup_slow(): bugger off on IS_DEADDIR() from the very beginning 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-04-14 19:33:34 -04:00
parent d2caaa0a77
commit 1936386ea9
1 changed files with 17 additions and 6 deletions
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23
fs/namei.c
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@ -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;
}