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make handle_dots() leave RCU mode on error 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
hifive-unleashed-5.1
Al Viro 2011-03-04 14:35:59 -05:00
parent 4455ca6223
commit ef7562d528
1 changed files with 12 additions and 11 deletions
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23
fs/namei.c
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@ -1052,7 +1052,7 @@ static int follow_dotdot_rcu(struct nameidata *nd)
seq = read_seqcount_begin(&parent->d_seq);
if (read_seqcount_retry(&old->d_seq, nd->seq))
return -ECHILD;
goto failed;
inode = parent->d_inode;
nd->path.dentry = parent;
nd->seq = seq;
@ -1065,8 +1065,14 @@ static int follow_dotdot_rcu(struct nameidata *nd)
}
__follow_mount_rcu(nd, &nd->path, &inode, true);
nd->inode = inode;
return 0;
failed:
nd->flags &= ~LOOKUP_RCU;
nd->root.mnt = NULL;
rcu_read_unlock();
br_read_unlock(vfsmount_lock);
return -ECHILD;
}
/*
@ -1405,9 +1411,8 @@ static int link_path_walk(const char *name, struct nameidata *nd)
* parent relationships.
*/
if (unlikely(type != LAST_NORM)) {
err = handle_dots(nd, type);
if (err)
goto return_err;
if (handle_dots(nd, type))
return -ECHILD;
continue;
}
@ -1441,12 +1446,8 @@ last_component:
nd->flags &= lookup_flags | ~LOOKUP_CONTINUE;
if (lookup_flags & LOOKUP_PARENT)
goto lookup_parent;
if (unlikely(type != LAST_NORM)) {
err = handle_dots(nd, type);
if (err)
goto return_err;
return 0;
}
if (unlikely(type != LAST_NORM))
return handle_dots(nd, type);
err = do_lookup(nd, &this, &next, &inode);
if (err)
break;