1053 lines
26 KiB
C
1053 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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*
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* Author: Adrian Hunter
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*/
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#include "ubifs.h"
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/*
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* An orphan is an inode number whose inode node has been committed to the index
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* with a link count of zero. That happens when an open file is deleted
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* (unlinked) and then a commit is run. In the normal course of events the inode
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* would be deleted when the file is closed. However in the case of an unclean
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* unmount, orphans need to be accounted for. After an unclean unmount, the
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* orphans' inodes must be deleted which means either scanning the entire index
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* looking for them, or keeping a list on flash somewhere. This unit implements
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* the latter approach.
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*
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* The orphan area is a fixed number of LEBs situated between the LPT area and
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* the main area. The number of orphan area LEBs is specified when the file
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* system is created. The minimum number is 1. The size of the orphan area
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* should be so that it can hold the maximum number of orphans that are expected
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* to ever exist at one time.
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*
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* The number of orphans that can fit in a LEB is:
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*
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* (c->leb_size - UBIFS_ORPH_NODE_SZ) / sizeof(__le64)
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*
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* For example: a 15872 byte LEB can fit 1980 orphans so 1 LEB may be enough.
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*
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* Orphans are accumulated in a rb-tree. When an inode's link count drops to
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* zero, the inode number is added to the rb-tree. It is removed from the tree
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* when the inode is deleted. Any new orphans that are in the orphan tree when
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* the commit is run, are written to the orphan area in 1 or more orphan nodes.
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* If the orphan area is full, it is consolidated to make space. There is
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* always enough space because validation prevents the user from creating more
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* than the maximum number of orphans allowed.
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*/
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static int dbg_check_orphans(struct ubifs_info *c);
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static struct ubifs_orphan *orphan_add(struct ubifs_info *c, ino_t inum,
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struct ubifs_orphan *parent_orphan)
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{
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struct ubifs_orphan *orphan, *o;
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struct rb_node **p, *parent = NULL;
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orphan = kzalloc(sizeof(struct ubifs_orphan), GFP_NOFS);
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if (!orphan)
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return ERR_PTR(-ENOMEM);
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orphan->inum = inum;
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orphan->new = 1;
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INIT_LIST_HEAD(&orphan->child_list);
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spin_lock(&c->orphan_lock);
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if (c->tot_orphans >= c->max_orphans) {
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spin_unlock(&c->orphan_lock);
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kfree(orphan);
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return ERR_PTR(-ENFILE);
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}
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p = &c->orph_tree.rb_node;
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while (*p) {
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parent = *p;
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o = rb_entry(parent, struct ubifs_orphan, rb);
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if (inum < o->inum)
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p = &(*p)->rb_left;
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else if (inum > o->inum)
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p = &(*p)->rb_right;
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else {
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ubifs_err(c, "orphaned twice");
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spin_unlock(&c->orphan_lock);
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kfree(orphan);
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return ERR_PTR(-EINVAL);
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}
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}
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c->tot_orphans += 1;
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c->new_orphans += 1;
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rb_link_node(&orphan->rb, parent, p);
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rb_insert_color(&orphan->rb, &c->orph_tree);
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list_add_tail(&orphan->list, &c->orph_list);
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list_add_tail(&orphan->new_list, &c->orph_new);
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if (parent_orphan) {
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list_add_tail(&orphan->child_list,
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&parent_orphan->child_list);
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}
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spin_unlock(&c->orphan_lock);
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dbg_gen("ino %lu", (unsigned long)inum);
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return orphan;
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}
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static struct ubifs_orphan *lookup_orphan(struct ubifs_info *c, ino_t inum)
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{
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struct ubifs_orphan *o;
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struct rb_node *p;
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p = c->orph_tree.rb_node;
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while (p) {
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o = rb_entry(p, struct ubifs_orphan, rb);
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if (inum < o->inum)
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p = p->rb_left;
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else if (inum > o->inum)
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p = p->rb_right;
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else {
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return o;
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}
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}
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return NULL;
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}
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static void __orphan_drop(struct ubifs_info *c, struct ubifs_orphan *o)
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{
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rb_erase(&o->rb, &c->orph_tree);
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list_del(&o->list);
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c->tot_orphans -= 1;
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if (o->new) {
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list_del(&o->new_list);
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c->new_orphans -= 1;
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}
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kfree(o);
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}
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static void orphan_delete(struct ubifs_info *c, struct ubifs_orphan *orph)
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{
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if (orph->del) {
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dbg_gen("deleted twice ino %lu", (unsigned long)orph->inum);
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return;
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}
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if (orph->cmt) {
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orph->del = 1;
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orph->dnext = c->orph_dnext;
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c->orph_dnext = orph;
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dbg_gen("delete later ino %lu", (unsigned long)orph->inum);
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return;
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}
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__orphan_drop(c, orph);
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}
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/**
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* ubifs_add_orphan - add an orphan.
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* @c: UBIFS file-system description object
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* @inum: orphan inode number
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*
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* Add an orphan. This function is called when an inodes link count drops to
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* zero.
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*/
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int ubifs_add_orphan(struct ubifs_info *c, ino_t inum)
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{
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int err = 0;
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ino_t xattr_inum;
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union ubifs_key key;
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struct ubifs_dent_node *xent, *pxent = NULL;
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struct fscrypt_name nm = {0};
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struct ubifs_orphan *xattr_orphan;
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struct ubifs_orphan *orphan;
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orphan = orphan_add(c, inum, NULL);
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if (IS_ERR(orphan))
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return PTR_ERR(orphan);
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lowest_xent_key(c, &key, inum);
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while (1) {
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xent = ubifs_tnc_next_ent(c, &key, &nm);
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if (IS_ERR(xent)) {
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err = PTR_ERR(xent);
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if (err == -ENOENT)
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break;
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kfree(pxent);
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return err;
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}
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fname_name(&nm) = xent->name;
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fname_len(&nm) = le16_to_cpu(xent->nlen);
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xattr_inum = le64_to_cpu(xent->inum);
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xattr_orphan = orphan_add(c, xattr_inum, orphan);
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if (IS_ERR(xattr_orphan)) {
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kfree(pxent);
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kfree(xent);
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return PTR_ERR(xattr_orphan);
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}
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kfree(pxent);
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pxent = xent;
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key_read(c, &xent->key, &key);
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}
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kfree(pxent);
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return 0;
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}
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/**
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* ubifs_delete_orphan - delete an orphan.
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* @c: UBIFS file-system description object
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* @inum: orphan inode number
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*
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* Delete an orphan. This function is called when an inode is deleted.
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*/
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void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum)
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{
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struct ubifs_orphan *orph, *child_orph, *tmp_o;
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spin_lock(&c->orphan_lock);
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orph = lookup_orphan(c, inum);
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if (!orph) {
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spin_unlock(&c->orphan_lock);
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ubifs_err(c, "missing orphan ino %lu", (unsigned long)inum);
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dump_stack();
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return;
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}
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list_for_each_entry_safe(child_orph, tmp_o, &orph->child_list, child_list) {
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list_del(&child_orph->child_list);
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orphan_delete(c, child_orph);
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}
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orphan_delete(c, orph);
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spin_unlock(&c->orphan_lock);
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}
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/**
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* ubifs_orphan_start_commit - start commit of orphans.
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* @c: UBIFS file-system description object
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*
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* Start commit of orphans.
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*/
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int ubifs_orphan_start_commit(struct ubifs_info *c)
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{
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struct ubifs_orphan *orphan, **last;
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spin_lock(&c->orphan_lock);
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last = &c->orph_cnext;
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list_for_each_entry(orphan, &c->orph_new, new_list) {
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ubifs_assert(c, orphan->new);
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ubifs_assert(c, !orphan->cmt);
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orphan->new = 0;
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orphan->cmt = 1;
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*last = orphan;
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last = &orphan->cnext;
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}
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*last = NULL;
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c->cmt_orphans = c->new_orphans;
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c->new_orphans = 0;
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dbg_cmt("%d orphans to commit", c->cmt_orphans);
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INIT_LIST_HEAD(&c->orph_new);
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if (c->tot_orphans == 0)
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c->no_orphs = 1;
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else
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c->no_orphs = 0;
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spin_unlock(&c->orphan_lock);
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return 0;
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}
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/**
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* avail_orphs - calculate available space.
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* @c: UBIFS file-system description object
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*
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* This function returns the number of orphans that can be written in the
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* available space.
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*/
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static int avail_orphs(struct ubifs_info *c)
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{
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int avail_lebs, avail, gap;
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avail_lebs = c->orph_lebs - (c->ohead_lnum - c->orph_first) - 1;
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avail = avail_lebs *
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((c->leb_size - UBIFS_ORPH_NODE_SZ) / sizeof(__le64));
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gap = c->leb_size - c->ohead_offs;
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if (gap >= UBIFS_ORPH_NODE_SZ + sizeof(__le64))
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avail += (gap - UBIFS_ORPH_NODE_SZ) / sizeof(__le64);
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return avail;
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}
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/**
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* tot_avail_orphs - calculate total space.
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* @c: UBIFS file-system description object
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*
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* This function returns the number of orphans that can be written in half
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* the total space. That leaves half the space for adding new orphans.
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*/
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static int tot_avail_orphs(struct ubifs_info *c)
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{
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int avail_lebs, avail;
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avail_lebs = c->orph_lebs;
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avail = avail_lebs *
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((c->leb_size - UBIFS_ORPH_NODE_SZ) / sizeof(__le64));
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return avail / 2;
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}
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/**
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* do_write_orph_node - write a node to the orphan head.
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* @c: UBIFS file-system description object
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* @len: length of node
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* @atomic: write atomically
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*
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* This function writes a node to the orphan head from the orphan buffer. If
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* %atomic is not zero, then the write is done atomically. On success, %0 is
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* returned, otherwise a negative error code is returned.
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*/
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static int do_write_orph_node(struct ubifs_info *c, int len, int atomic)
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{
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int err = 0;
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if (atomic) {
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ubifs_assert(c, c->ohead_offs == 0);
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ubifs_prepare_node(c, c->orph_buf, len, 1);
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len = ALIGN(len, c->min_io_size);
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err = ubifs_leb_change(c, c->ohead_lnum, c->orph_buf, len);
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} else {
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if (c->ohead_offs == 0) {
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/* Ensure LEB has been unmapped */
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err = ubifs_leb_unmap(c, c->ohead_lnum);
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if (err)
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return err;
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}
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err = ubifs_write_node(c, c->orph_buf, len, c->ohead_lnum,
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c->ohead_offs);
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}
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return err;
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}
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/**
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* write_orph_node - write an orphan node.
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* @c: UBIFS file-system description object
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* @atomic: write atomically
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*
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* This function builds an orphan node from the cnext list and writes it to the
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* orphan head. On success, %0 is returned, otherwise a negative error code
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* is returned.
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*/
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static int write_orph_node(struct ubifs_info *c, int atomic)
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{
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struct ubifs_orphan *orphan, *cnext;
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struct ubifs_orph_node *orph;
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int gap, err, len, cnt, i;
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ubifs_assert(c, c->cmt_orphans > 0);
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gap = c->leb_size - c->ohead_offs;
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if (gap < UBIFS_ORPH_NODE_SZ + sizeof(__le64)) {
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c->ohead_lnum += 1;
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c->ohead_offs = 0;
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gap = c->leb_size;
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if (c->ohead_lnum > c->orph_last) {
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/*
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* We limit the number of orphans so that this should
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* never happen.
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*/
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ubifs_err(c, "out of space in orphan area");
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return -EINVAL;
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}
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}
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cnt = (gap - UBIFS_ORPH_NODE_SZ) / sizeof(__le64);
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if (cnt > c->cmt_orphans)
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cnt = c->cmt_orphans;
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len = UBIFS_ORPH_NODE_SZ + cnt * sizeof(__le64);
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ubifs_assert(c, c->orph_buf);
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orph = c->orph_buf;
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orph->ch.node_type = UBIFS_ORPH_NODE;
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spin_lock(&c->orphan_lock);
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cnext = c->orph_cnext;
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for (i = 0; i < cnt; i++) {
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orphan = cnext;
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ubifs_assert(c, orphan->cmt);
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orph->inos[i] = cpu_to_le64(orphan->inum);
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orphan->cmt = 0;
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cnext = orphan->cnext;
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orphan->cnext = NULL;
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}
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c->orph_cnext = cnext;
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c->cmt_orphans -= cnt;
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spin_unlock(&c->orphan_lock);
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if (c->cmt_orphans)
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orph->cmt_no = cpu_to_le64(c->cmt_no);
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else
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/* Mark the last node of the commit */
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orph->cmt_no = cpu_to_le64((c->cmt_no) | (1ULL << 63));
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ubifs_assert(c, c->ohead_offs + len <= c->leb_size);
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ubifs_assert(c, c->ohead_lnum >= c->orph_first);
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ubifs_assert(c, c->ohead_lnum <= c->orph_last);
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err = do_write_orph_node(c, len, atomic);
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c->ohead_offs += ALIGN(len, c->min_io_size);
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c->ohead_offs = ALIGN(c->ohead_offs, 8);
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return err;
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}
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/**
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* write_orph_nodes - write orphan nodes until there are no more to commit.
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* @c: UBIFS file-system description object
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* @atomic: write atomically
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*
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* This function writes orphan nodes for all the orphans to commit. On success,
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* %0 is returned, otherwise a negative error code is returned.
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*/
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static int write_orph_nodes(struct ubifs_info *c, int atomic)
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{
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int err;
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while (c->cmt_orphans > 0) {
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err = write_orph_node(c, atomic);
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if (err)
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return err;
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}
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if (atomic) {
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int lnum;
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/* Unmap any unused LEBs after consolidation */
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for (lnum = c->ohead_lnum + 1; lnum <= c->orph_last; lnum++) {
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err = ubifs_leb_unmap(c, lnum);
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if (err)
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return err;
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}
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}
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return 0;
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}
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/**
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* consolidate - consolidate the orphan area.
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* @c: UBIFS file-system description object
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*
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* This function enables consolidation by putting all the orphans into the list
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* to commit. The list is in the order that the orphans were added, and the
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* LEBs are written atomically in order, so at no time can orphans be lost by
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* an unclean unmount.
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*
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* This function returns %0 on success and a negative error code on failure.
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*/
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static int consolidate(struct ubifs_info *c)
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{
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int tot_avail = tot_avail_orphs(c), err = 0;
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spin_lock(&c->orphan_lock);
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dbg_cmt("there is space for %d orphans and there are %d",
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tot_avail, c->tot_orphans);
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if (c->tot_orphans - c->new_orphans <= tot_avail) {
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struct ubifs_orphan *orphan, **last;
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int cnt = 0;
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/* Change the cnext list to include all non-new orphans */
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last = &c->orph_cnext;
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list_for_each_entry(orphan, &c->orph_list, list) {
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if (orphan->new)
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continue;
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orphan->cmt = 1;
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*last = orphan;
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last = &orphan->cnext;
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cnt += 1;
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}
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*last = NULL;
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ubifs_assert(c, cnt == c->tot_orphans - c->new_orphans);
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c->cmt_orphans = cnt;
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c->ohead_lnum = c->orph_first;
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c->ohead_offs = 0;
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} else {
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/*
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* We limit the number of orphans so that this should
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* never happen.
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*/
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ubifs_err(c, "out of space in orphan area");
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err = -EINVAL;
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}
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spin_unlock(&c->orphan_lock);
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return err;
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}
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/**
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* commit_orphans - commit orphans.
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* @c: UBIFS file-system description object
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*
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* This function commits orphans to flash. On success, %0 is returned,
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* otherwise a negative error code is returned.
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*/
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static int commit_orphans(struct ubifs_info *c)
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{
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int avail, atomic = 0, err;
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ubifs_assert(c, c->cmt_orphans > 0);
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avail = avail_orphs(c);
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if (avail < c->cmt_orphans) {
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/* Not enough space to write new orphans, so consolidate */
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err = consolidate(c);
|
|
if (err)
|
|
return err;
|
|
atomic = 1;
|
|
}
|
|
err = write_orph_nodes(c, atomic);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* erase_deleted - erase the orphans marked for deletion.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* During commit, the orphans being committed cannot be deleted, so they are
|
|
* marked for deletion and deleted by this function. Also, the recovery
|
|
* adds killed orphans to the deletion list, and therefore they are deleted
|
|
* here too.
|
|
*/
|
|
static void erase_deleted(struct ubifs_info *c)
|
|
{
|
|
struct ubifs_orphan *orphan, *dnext;
|
|
|
|
spin_lock(&c->orphan_lock);
|
|
dnext = c->orph_dnext;
|
|
while (dnext) {
|
|
orphan = dnext;
|
|
dnext = orphan->dnext;
|
|
ubifs_assert(c, !orphan->new);
|
|
ubifs_assert(c, orphan->del);
|
|
rb_erase(&orphan->rb, &c->orph_tree);
|
|
list_del(&orphan->list);
|
|
c->tot_orphans -= 1;
|
|
dbg_gen("deleting orphan ino %lu", (unsigned long)orphan->inum);
|
|
kfree(orphan);
|
|
}
|
|
c->orph_dnext = NULL;
|
|
spin_unlock(&c->orphan_lock);
|
|
}
|
|
|
|
/**
|
|
* ubifs_orphan_end_commit - end commit of orphans.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* End commit of orphans.
|
|
*/
|
|
int ubifs_orphan_end_commit(struct ubifs_info *c)
|
|
{
|
|
int err;
|
|
|
|
if (c->cmt_orphans != 0) {
|
|
err = commit_orphans(c);
|
|
if (err)
|
|
return err;
|
|
}
|
|
erase_deleted(c);
|
|
err = dbg_check_orphans(c);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubifs_clear_orphans - erase all LEBs used for orphans.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* If recovery is not required, then the orphans from the previous session
|
|
* are not needed. This function locates the LEBs used to record
|
|
* orphans, and un-maps them.
|
|
*/
|
|
int ubifs_clear_orphans(struct ubifs_info *c)
|
|
{
|
|
int lnum, err;
|
|
|
|
for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
|
|
err = ubifs_leb_unmap(c, lnum);
|
|
if (err)
|
|
return err;
|
|
}
|
|
c->ohead_lnum = c->orph_first;
|
|
c->ohead_offs = 0;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* insert_dead_orphan - insert an orphan.
|
|
* @c: UBIFS file-system description object
|
|
* @inum: orphan inode number
|
|
*
|
|
* This function is a helper to the 'do_kill_orphans()' function. The orphan
|
|
* must be kept until the next commit, so it is added to the rb-tree and the
|
|
* deletion list.
|
|
*/
|
|
static int insert_dead_orphan(struct ubifs_info *c, ino_t inum)
|
|
{
|
|
struct ubifs_orphan *orphan, *o;
|
|
struct rb_node **p, *parent = NULL;
|
|
|
|
orphan = kzalloc(sizeof(struct ubifs_orphan), GFP_KERNEL);
|
|
if (!orphan)
|
|
return -ENOMEM;
|
|
orphan->inum = inum;
|
|
|
|
p = &c->orph_tree.rb_node;
|
|
while (*p) {
|
|
parent = *p;
|
|
o = rb_entry(parent, struct ubifs_orphan, rb);
|
|
if (inum < o->inum)
|
|
p = &(*p)->rb_left;
|
|
else if (inum > o->inum)
|
|
p = &(*p)->rb_right;
|
|
else {
|
|
/* Already added - no problem */
|
|
kfree(orphan);
|
|
return 0;
|
|
}
|
|
}
|
|
c->tot_orphans += 1;
|
|
rb_link_node(&orphan->rb, parent, p);
|
|
rb_insert_color(&orphan->rb, &c->orph_tree);
|
|
list_add_tail(&orphan->list, &c->orph_list);
|
|
orphan->del = 1;
|
|
orphan->dnext = c->orph_dnext;
|
|
c->orph_dnext = orphan;
|
|
dbg_mnt("ino %lu, new %d, tot %d", (unsigned long)inum,
|
|
c->new_orphans, c->tot_orphans);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* do_kill_orphans - remove orphan inodes from the index.
|
|
* @c: UBIFS file-system description object
|
|
* @sleb: scanned LEB
|
|
* @last_cmt_no: cmt_no of last orphan node read is passed and returned here
|
|
* @outofdate: whether the LEB is out of date is returned here
|
|
* @last_flagged: whether the end orphan node is encountered
|
|
*
|
|
* This function is a helper to the 'kill_orphans()' function. It goes through
|
|
* every orphan node in a LEB and for every inode number recorded, removes
|
|
* all keys for that inode from the TNC.
|
|
*/
|
|
static int do_kill_orphans(struct ubifs_info *c, struct ubifs_scan_leb *sleb,
|
|
unsigned long long *last_cmt_no, int *outofdate,
|
|
int *last_flagged)
|
|
{
|
|
struct ubifs_scan_node *snod;
|
|
struct ubifs_orph_node *orph;
|
|
struct ubifs_ino_node *ino = NULL;
|
|
unsigned long long cmt_no;
|
|
ino_t inum;
|
|
int i, n, err, first = 1;
|
|
|
|
ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
|
|
if (!ino)
|
|
return -ENOMEM;
|
|
|
|
list_for_each_entry(snod, &sleb->nodes, list) {
|
|
if (snod->type != UBIFS_ORPH_NODE) {
|
|
ubifs_err(c, "invalid node type %d in orphan area at %d:%d",
|
|
snod->type, sleb->lnum, snod->offs);
|
|
ubifs_dump_node(c, snod->node,
|
|
c->leb_size - snod->offs);
|
|
err = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
orph = snod->node;
|
|
|
|
/* Check commit number */
|
|
cmt_no = le64_to_cpu(orph->cmt_no) & LLONG_MAX;
|
|
/*
|
|
* The commit number on the master node may be less, because
|
|
* of a failed commit. If there are several failed commits in a
|
|
* row, the commit number written on orphan nodes will continue
|
|
* to increase (because the commit number is adjusted here) even
|
|
* though the commit number on the master node stays the same
|
|
* because the master node has not been re-written.
|
|
*/
|
|
if (cmt_no > c->cmt_no)
|
|
c->cmt_no = cmt_no;
|
|
if (cmt_no < *last_cmt_no && *last_flagged) {
|
|
/*
|
|
* The last orphan node had a higher commit number and
|
|
* was flagged as the last written for that commit
|
|
* number. That makes this orphan node, out of date.
|
|
*/
|
|
if (!first) {
|
|
ubifs_err(c, "out of order commit number %llu in orphan node at %d:%d",
|
|
cmt_no, sleb->lnum, snod->offs);
|
|
ubifs_dump_node(c, snod->node,
|
|
c->leb_size - snod->offs);
|
|
err = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
dbg_rcvry("out of date LEB %d", sleb->lnum);
|
|
*outofdate = 1;
|
|
err = 0;
|
|
goto out_free;
|
|
}
|
|
|
|
if (first)
|
|
first = 0;
|
|
|
|
n = (le32_to_cpu(orph->ch.len) - UBIFS_ORPH_NODE_SZ) >> 3;
|
|
for (i = 0; i < n; i++) {
|
|
union ubifs_key key1, key2;
|
|
|
|
inum = le64_to_cpu(orph->inos[i]);
|
|
|
|
ino_key_init(c, &key1, inum);
|
|
err = ubifs_tnc_lookup(c, &key1, ino);
|
|
if (err && err != -ENOENT)
|
|
goto out_free;
|
|
|
|
/*
|
|
* Check whether an inode can really get deleted.
|
|
* linkat() with O_TMPFILE allows rebirth of an inode.
|
|
*/
|
|
if (err == 0 && ino->nlink == 0) {
|
|
dbg_rcvry("deleting orphaned inode %lu",
|
|
(unsigned long)inum);
|
|
|
|
lowest_ino_key(c, &key1, inum);
|
|
highest_ino_key(c, &key2, inum);
|
|
|
|
err = ubifs_tnc_remove_range(c, &key1, &key2);
|
|
if (err)
|
|
goto out_ro;
|
|
}
|
|
|
|
err = insert_dead_orphan(c, inum);
|
|
if (err)
|
|
goto out_free;
|
|
}
|
|
|
|
*last_cmt_no = cmt_no;
|
|
if (le64_to_cpu(orph->cmt_no) & (1ULL << 63)) {
|
|
dbg_rcvry("last orph node for commit %llu at %d:%d",
|
|
cmt_no, sleb->lnum, snod->offs);
|
|
*last_flagged = 1;
|
|
} else
|
|
*last_flagged = 0;
|
|
}
|
|
|
|
err = 0;
|
|
out_free:
|
|
kfree(ino);
|
|
return err;
|
|
|
|
out_ro:
|
|
ubifs_ro_mode(c, err);
|
|
kfree(ino);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* kill_orphans - remove all orphan inodes from the index.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* If recovery is required, then orphan inodes recorded during the previous
|
|
* session (which ended with an unclean unmount) must be deleted from the index.
|
|
* This is done by updating the TNC, but since the index is not updated until
|
|
* the next commit, the LEBs where the orphan information is recorded are not
|
|
* erased until the next commit.
|
|
*/
|
|
static int kill_orphans(struct ubifs_info *c)
|
|
{
|
|
unsigned long long last_cmt_no = 0;
|
|
int lnum, err = 0, outofdate = 0, last_flagged = 0;
|
|
|
|
c->ohead_lnum = c->orph_first;
|
|
c->ohead_offs = 0;
|
|
/* Check no-orphans flag and skip this if no orphans */
|
|
if (c->no_orphs) {
|
|
dbg_rcvry("no orphans");
|
|
return 0;
|
|
}
|
|
/*
|
|
* Orph nodes always start at c->orph_first and are written to each
|
|
* successive LEB in turn. Generally unused LEBs will have been unmapped
|
|
* but may contain out of date orphan nodes if the unmap didn't go
|
|
* through. In addition, the last orphan node written for each commit is
|
|
* marked (top bit of orph->cmt_no is set to 1). It is possible that
|
|
* there are orphan nodes from the next commit (i.e. the commit did not
|
|
* complete successfully). In that case, no orphans will have been lost
|
|
* due to the way that orphans are written, and any orphans added will
|
|
* be valid orphans anyway and so can be deleted.
|
|
*/
|
|
for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
|
|
struct ubifs_scan_leb *sleb;
|
|
|
|
dbg_rcvry("LEB %d", lnum);
|
|
sleb = ubifs_scan(c, lnum, 0, c->sbuf, 1);
|
|
if (IS_ERR(sleb)) {
|
|
if (PTR_ERR(sleb) == -EUCLEAN)
|
|
sleb = ubifs_recover_leb(c, lnum, 0,
|
|
c->sbuf, -1);
|
|
if (IS_ERR(sleb)) {
|
|
err = PTR_ERR(sleb);
|
|
break;
|
|
}
|
|
}
|
|
err = do_kill_orphans(c, sleb, &last_cmt_no, &outofdate,
|
|
&last_flagged);
|
|
if (err || outofdate) {
|
|
ubifs_scan_destroy(sleb);
|
|
break;
|
|
}
|
|
if (sleb->endpt) {
|
|
c->ohead_lnum = lnum;
|
|
c->ohead_offs = sleb->endpt;
|
|
}
|
|
ubifs_scan_destroy(sleb);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubifs_mount_orphans - delete orphan inodes and erase LEBs that recorded them.
|
|
* @c: UBIFS file-system description object
|
|
* @unclean: indicates recovery from unclean unmount
|
|
* @read_only: indicates read only mount
|
|
*
|
|
* This function is called when mounting to erase orphans from the previous
|
|
* session. If UBIFS was not unmounted cleanly, then the inodes recorded as
|
|
* orphans are deleted.
|
|
*/
|
|
int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only)
|
|
{
|
|
int err = 0;
|
|
|
|
c->max_orphans = tot_avail_orphs(c);
|
|
|
|
if (!read_only) {
|
|
c->orph_buf = vmalloc(c->leb_size);
|
|
if (!c->orph_buf)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (unclean)
|
|
err = kill_orphans(c);
|
|
else if (!read_only)
|
|
err = ubifs_clear_orphans(c);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Everything below is related to debugging.
|
|
*/
|
|
|
|
struct check_orphan {
|
|
struct rb_node rb;
|
|
ino_t inum;
|
|
};
|
|
|
|
struct check_info {
|
|
unsigned long last_ino;
|
|
unsigned long tot_inos;
|
|
unsigned long missing;
|
|
unsigned long long leaf_cnt;
|
|
struct ubifs_ino_node *node;
|
|
struct rb_root root;
|
|
};
|
|
|
|
static bool dbg_find_orphan(struct ubifs_info *c, ino_t inum)
|
|
{
|
|
bool found = false;
|
|
|
|
spin_lock(&c->orphan_lock);
|
|
found = !!lookup_orphan(c, inum);
|
|
spin_unlock(&c->orphan_lock);
|
|
|
|
return found;
|
|
}
|
|
|
|
static int dbg_ins_check_orphan(struct rb_root *root, ino_t inum)
|
|
{
|
|
struct check_orphan *orphan, *o;
|
|
struct rb_node **p, *parent = NULL;
|
|
|
|
orphan = kzalloc(sizeof(struct check_orphan), GFP_NOFS);
|
|
if (!orphan)
|
|
return -ENOMEM;
|
|
orphan->inum = inum;
|
|
|
|
p = &root->rb_node;
|
|
while (*p) {
|
|
parent = *p;
|
|
o = rb_entry(parent, struct check_orphan, rb);
|
|
if (inum < o->inum)
|
|
p = &(*p)->rb_left;
|
|
else if (inum > o->inum)
|
|
p = &(*p)->rb_right;
|
|
else {
|
|
kfree(orphan);
|
|
return 0;
|
|
}
|
|
}
|
|
rb_link_node(&orphan->rb, parent, p);
|
|
rb_insert_color(&orphan->rb, root);
|
|
return 0;
|
|
}
|
|
|
|
static int dbg_find_check_orphan(struct rb_root *root, ino_t inum)
|
|
{
|
|
struct check_orphan *o;
|
|
struct rb_node *p;
|
|
|
|
p = root->rb_node;
|
|
while (p) {
|
|
o = rb_entry(p, struct check_orphan, rb);
|
|
if (inum < o->inum)
|
|
p = p->rb_left;
|
|
else if (inum > o->inum)
|
|
p = p->rb_right;
|
|
else
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void dbg_free_check_tree(struct rb_root *root)
|
|
{
|
|
struct check_orphan *o, *n;
|
|
|
|
rbtree_postorder_for_each_entry_safe(o, n, root, rb)
|
|
kfree(o);
|
|
}
|
|
|
|
static int dbg_orphan_check(struct ubifs_info *c, struct ubifs_zbranch *zbr,
|
|
void *priv)
|
|
{
|
|
struct check_info *ci = priv;
|
|
ino_t inum;
|
|
int err;
|
|
|
|
inum = key_inum(c, &zbr->key);
|
|
if (inum != ci->last_ino) {
|
|
/* Lowest node type is the inode node, so it comes first */
|
|
if (key_type(c, &zbr->key) != UBIFS_INO_KEY)
|
|
ubifs_err(c, "found orphan node ino %lu, type %d",
|
|
(unsigned long)inum, key_type(c, &zbr->key));
|
|
ci->last_ino = inum;
|
|
ci->tot_inos += 1;
|
|
err = ubifs_tnc_read_node(c, zbr, ci->node);
|
|
if (err) {
|
|
ubifs_err(c, "node read failed, error %d", err);
|
|
return err;
|
|
}
|
|
if (ci->node->nlink == 0)
|
|
/* Must be recorded as an orphan */
|
|
if (!dbg_find_check_orphan(&ci->root, inum) &&
|
|
!dbg_find_orphan(c, inum)) {
|
|
ubifs_err(c, "missing orphan, ino %lu",
|
|
(unsigned long)inum);
|
|
ci->missing += 1;
|
|
}
|
|
}
|
|
ci->leaf_cnt += 1;
|
|
return 0;
|
|
}
|
|
|
|
static int dbg_read_orphans(struct check_info *ci, struct ubifs_scan_leb *sleb)
|
|
{
|
|
struct ubifs_scan_node *snod;
|
|
struct ubifs_orph_node *orph;
|
|
ino_t inum;
|
|
int i, n, err;
|
|
|
|
list_for_each_entry(snod, &sleb->nodes, list) {
|
|
cond_resched();
|
|
if (snod->type != UBIFS_ORPH_NODE)
|
|
continue;
|
|
orph = snod->node;
|
|
n = (le32_to_cpu(orph->ch.len) - UBIFS_ORPH_NODE_SZ) >> 3;
|
|
for (i = 0; i < n; i++) {
|
|
inum = le64_to_cpu(orph->inos[i]);
|
|
err = dbg_ins_check_orphan(&ci->root, inum);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int dbg_scan_orphans(struct ubifs_info *c, struct check_info *ci)
|
|
{
|
|
int lnum, err = 0;
|
|
void *buf;
|
|
|
|
/* Check no-orphans flag and skip this if no orphans */
|
|
if (c->no_orphs)
|
|
return 0;
|
|
|
|
buf = __vmalloc(c->leb_size, GFP_NOFS);
|
|
if (!buf) {
|
|
ubifs_err(c, "cannot allocate memory to check orphans");
|
|
return 0;
|
|
}
|
|
|
|
for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
|
|
struct ubifs_scan_leb *sleb;
|
|
|
|
sleb = ubifs_scan(c, lnum, 0, buf, 0);
|
|
if (IS_ERR(sleb)) {
|
|
err = PTR_ERR(sleb);
|
|
break;
|
|
}
|
|
|
|
err = dbg_read_orphans(ci, sleb);
|
|
ubifs_scan_destroy(sleb);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
vfree(buf);
|
|
return err;
|
|
}
|
|
|
|
static int dbg_check_orphans(struct ubifs_info *c)
|
|
{
|
|
struct check_info ci;
|
|
int err;
|
|
|
|
if (!dbg_is_chk_orph(c))
|
|
return 0;
|
|
|
|
ci.last_ino = 0;
|
|
ci.tot_inos = 0;
|
|
ci.missing = 0;
|
|
ci.leaf_cnt = 0;
|
|
ci.root = RB_ROOT;
|
|
ci.node = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
|
|
if (!ci.node) {
|
|
ubifs_err(c, "out of memory");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
err = dbg_scan_orphans(c, &ci);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = dbg_walk_index(c, &dbg_orphan_check, NULL, &ci);
|
|
if (err) {
|
|
ubifs_err(c, "cannot scan TNC, error %d", err);
|
|
goto out;
|
|
}
|
|
|
|
if (ci.missing) {
|
|
ubifs_err(c, "%lu missing orphan(s)", ci.missing);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
dbg_cmt("last inode number is %lu", ci.last_ino);
|
|
dbg_cmt("total number of inodes is %lu", ci.tot_inos);
|
|
dbg_cmt("total number of leaf nodes is %llu", ci.leaf_cnt);
|
|
|
|
out:
|
|
dbg_free_check_tree(&ci.root);
|
|
kfree(ci.node);
|
|
return err;
|
|
}
|