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reconnect_one(): use lookup_one_len_unlocked()

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... and explain the non-obvious logics in case when lookup yields
a different dentry.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-04-14 19:12:42 -04:00
parent 1ae1f3f647
commit 383d4e8ab0
1 changed files with 7 additions and 3 deletions
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10
fs/exportfs/expfs.c
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@ -143,14 +143,18 @@ static struct dentry *reconnect_one(struct vfsmount *mnt,
if (err)
goto out_err;
dprintk("%s: found name: %s\n", __func__, nbuf);
inode_lock(parent->d_inode);
tmp = lookup_one_len(nbuf, parent, strlen(nbuf));
inode_unlock(parent->d_inode);
tmp = lookup_one_len_unlocked(nbuf, parent, strlen(nbuf));
if (IS_ERR(tmp)) {
dprintk("%s: lookup failed: %d\n", __func__, PTR_ERR(tmp));
goto out_err;
}
if (tmp != dentry) {
/*
* Somebody has renamed it since exportfs_get_name();
* great, since it could've only been renamed if it
* got looked up and thus connected, and it would
* remain connected afterwards. We are done.
*/
dput(tmp);
goto out_reconnected;
}