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https://github.com/brain-hackers/u-boot-brain
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![Heiko Schocher](/assets/img/avatar_default.png)
sync with linux v4.2 commit 64291f7db5bd8150a74ad2036f1037e6a0428df2 Author: Linus Torvalds <torvalds@linux-foundation.org> Date: Sun Aug 30 11:34:09 2015 -0700 Linux 4.2 This update is needed, as it turned out, that fastmap was in experimental/broken state in kernel v3.15, which was the last base for U-Boot. Signed-off-by: Heiko Schocher <hs@denx.de> Tested-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
746 lines
19 KiB
C
746 lines
19 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*
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* Authors: Artem Bityutskiy (Битюцкий Артём)
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* Adrian Hunter
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*/
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/*
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* This file is a part of UBIFS journal implementation and contains various
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* functions which manipulate the log. The log is a fixed area on the flash
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* which does not contain any data but refers to buds. The log is a part of the
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* journal.
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*/
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#ifdef __UBOOT__
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#include <linux/err.h>
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#endif
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#include "ubifs.h"
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static int dbg_check_bud_bytes(struct ubifs_info *c);
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/**
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* ubifs_search_bud - search bud LEB.
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* @c: UBIFS file-system description object
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* @lnum: logical eraseblock number to search
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*
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* This function searches bud LEB @lnum. Returns bud description object in case
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* of success and %NULL if there is no bud with this LEB number.
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*/
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struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum)
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{
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struct rb_node *p;
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struct ubifs_bud *bud;
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spin_lock(&c->buds_lock);
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p = c->buds.rb_node;
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while (p) {
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bud = rb_entry(p, struct ubifs_bud, rb);
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if (lnum < bud->lnum)
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p = p->rb_left;
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else if (lnum > bud->lnum)
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p = p->rb_right;
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else {
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spin_unlock(&c->buds_lock);
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return bud;
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}
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}
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spin_unlock(&c->buds_lock);
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return NULL;
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}
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/**
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* ubifs_get_wbuf - get the wbuf associated with a LEB, if there is one.
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* @c: UBIFS file-system description object
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* @lnum: logical eraseblock number to search
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*
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* This functions returns the wbuf for @lnum or %NULL if there is not one.
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*/
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struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum)
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{
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struct rb_node *p;
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struct ubifs_bud *bud;
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int jhead;
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if (!c->jheads)
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return NULL;
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spin_lock(&c->buds_lock);
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p = c->buds.rb_node;
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while (p) {
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bud = rb_entry(p, struct ubifs_bud, rb);
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if (lnum < bud->lnum)
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p = p->rb_left;
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else if (lnum > bud->lnum)
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p = p->rb_right;
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else {
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jhead = bud->jhead;
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spin_unlock(&c->buds_lock);
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return &c->jheads[jhead].wbuf;
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}
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}
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spin_unlock(&c->buds_lock);
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return NULL;
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}
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/**
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* empty_log_bytes - calculate amount of empty space in the log.
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* @c: UBIFS file-system description object
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*/
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static inline long long empty_log_bytes(const struct ubifs_info *c)
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{
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long long h, t;
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h = (long long)c->lhead_lnum * c->leb_size + c->lhead_offs;
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t = (long long)c->ltail_lnum * c->leb_size;
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if (h > t)
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return c->log_bytes - h + t;
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else if (h != t)
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return t - h;
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else if (c->lhead_lnum != c->ltail_lnum)
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return 0;
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else
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return c->log_bytes;
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}
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/**
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* ubifs_add_bud - add bud LEB to the tree of buds and its journal head list.
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* @c: UBIFS file-system description object
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* @bud: the bud to add
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*/
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void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud)
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{
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struct rb_node **p, *parent = NULL;
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struct ubifs_bud *b;
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struct ubifs_jhead *jhead;
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spin_lock(&c->buds_lock);
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p = &c->buds.rb_node;
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while (*p) {
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parent = *p;
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b = rb_entry(parent, struct ubifs_bud, rb);
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ubifs_assert(bud->lnum != b->lnum);
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if (bud->lnum < b->lnum)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&bud->rb, parent, p);
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rb_insert_color(&bud->rb, &c->buds);
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if (c->jheads) {
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jhead = &c->jheads[bud->jhead];
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list_add_tail(&bud->list, &jhead->buds_list);
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} else
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ubifs_assert(c->replaying && c->ro_mount);
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/*
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* Note, although this is a new bud, we anyway account this space now,
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* before any data has been written to it, because this is about to
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* guarantee fixed mount time, and this bud will anyway be read and
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* scanned.
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*/
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c->bud_bytes += c->leb_size - bud->start;
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dbg_log("LEB %d:%d, jhead %s, bud_bytes %lld", bud->lnum,
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bud->start, dbg_jhead(bud->jhead), c->bud_bytes);
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spin_unlock(&c->buds_lock);
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}
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/**
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* ubifs_add_bud_to_log - add a new bud to the log.
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* @c: UBIFS file-system description object
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* @jhead: journal head the bud belongs to
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* @lnum: LEB number of the bud
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* @offs: starting offset of the bud
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*
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* This function writes reference node for the new bud LEB @lnum it to the log,
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* and adds it to the buds tress. It also makes sure that log size does not
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* exceed the 'c->max_bud_bytes' limit. Returns zero in case of success,
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* %-EAGAIN if commit is required, and a negative error codes in case of
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* failure.
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*/
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int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs)
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{
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int err;
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struct ubifs_bud *bud;
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struct ubifs_ref_node *ref;
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bud = kmalloc(sizeof(struct ubifs_bud), GFP_NOFS);
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if (!bud)
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return -ENOMEM;
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ref = kzalloc(c->ref_node_alsz, GFP_NOFS);
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if (!ref) {
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kfree(bud);
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return -ENOMEM;
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}
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mutex_lock(&c->log_mutex);
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ubifs_assert(!c->ro_media && !c->ro_mount);
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if (c->ro_error) {
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err = -EROFS;
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goto out_unlock;
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}
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/* Make sure we have enough space in the log */
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if (empty_log_bytes(c) - c->ref_node_alsz < c->min_log_bytes) {
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dbg_log("not enough log space - %lld, required %d",
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empty_log_bytes(c), c->min_log_bytes);
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ubifs_commit_required(c);
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err = -EAGAIN;
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goto out_unlock;
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}
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/*
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* Make sure the amount of space in buds will not exceed the
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* 'c->max_bud_bytes' limit, because we want to guarantee mount time
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* limits.
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*
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* It is not necessary to hold @c->buds_lock when reading @c->bud_bytes
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* because we are holding @c->log_mutex. All @c->bud_bytes take place
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* when both @c->log_mutex and @c->bud_bytes are locked.
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*/
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if (c->bud_bytes + c->leb_size - offs > c->max_bud_bytes) {
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dbg_log("bud bytes %lld (%lld max), require commit",
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c->bud_bytes, c->max_bud_bytes);
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ubifs_commit_required(c);
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err = -EAGAIN;
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goto out_unlock;
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}
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/*
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* If the journal is full enough - start background commit. Note, it is
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* OK to read 'c->cmt_state' without spinlock because integer reads
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* are atomic in the kernel.
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*/
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if (c->bud_bytes >= c->bg_bud_bytes &&
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c->cmt_state == COMMIT_RESTING) {
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dbg_log("bud bytes %lld (%lld max), initiate BG commit",
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c->bud_bytes, c->max_bud_bytes);
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ubifs_request_bg_commit(c);
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}
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bud->lnum = lnum;
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bud->start = offs;
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bud->jhead = jhead;
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ref->ch.node_type = UBIFS_REF_NODE;
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ref->lnum = cpu_to_le32(bud->lnum);
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ref->offs = cpu_to_le32(bud->start);
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ref->jhead = cpu_to_le32(jhead);
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if (c->lhead_offs > c->leb_size - c->ref_node_alsz) {
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c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
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ubifs_assert(c->lhead_lnum != c->ltail_lnum);
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c->lhead_offs = 0;
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}
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if (c->lhead_offs == 0) {
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/* Must ensure next log LEB has been unmapped */
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err = ubifs_leb_unmap(c, c->lhead_lnum);
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if (err)
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goto out_unlock;
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}
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if (bud->start == 0) {
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/*
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* Before writing the LEB reference which refers an empty LEB
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* to the log, we have to make sure it is mapped, because
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* otherwise we'd risk to refer an LEB with garbage in case of
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* an unclean reboot, because the target LEB might have been
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* unmapped, but not yet physically erased.
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*/
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err = ubifs_leb_map(c, bud->lnum);
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if (err)
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goto out_unlock;
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}
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dbg_log("write ref LEB %d:%d",
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c->lhead_lnum, c->lhead_offs);
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err = ubifs_write_node(c, ref, UBIFS_REF_NODE_SZ, c->lhead_lnum,
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c->lhead_offs);
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if (err)
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goto out_unlock;
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c->lhead_offs += c->ref_node_alsz;
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ubifs_add_bud(c, bud);
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mutex_unlock(&c->log_mutex);
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kfree(ref);
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return 0;
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out_unlock:
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mutex_unlock(&c->log_mutex);
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kfree(ref);
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kfree(bud);
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return err;
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}
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/**
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* remove_buds - remove used buds.
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* @c: UBIFS file-system description object
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*
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* This function removes use buds from the buds tree. It does not remove the
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* buds which are pointed to by journal heads.
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*/
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static void remove_buds(struct ubifs_info *c)
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{
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struct rb_node *p;
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ubifs_assert(list_empty(&c->old_buds));
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c->cmt_bud_bytes = 0;
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spin_lock(&c->buds_lock);
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p = rb_first(&c->buds);
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while (p) {
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struct rb_node *p1 = p;
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struct ubifs_bud *bud;
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struct ubifs_wbuf *wbuf;
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p = rb_next(p);
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bud = rb_entry(p1, struct ubifs_bud, rb);
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wbuf = &c->jheads[bud->jhead].wbuf;
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if (wbuf->lnum == bud->lnum) {
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/*
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* Do not remove buds which are pointed to by journal
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* heads (non-closed buds).
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*/
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c->cmt_bud_bytes += wbuf->offs - bud->start;
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dbg_log("preserve %d:%d, jhead %s, bud bytes %d, cmt_bud_bytes %lld",
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bud->lnum, bud->start, dbg_jhead(bud->jhead),
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wbuf->offs - bud->start, c->cmt_bud_bytes);
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bud->start = wbuf->offs;
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} else {
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c->cmt_bud_bytes += c->leb_size - bud->start;
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dbg_log("remove %d:%d, jhead %s, bud bytes %d, cmt_bud_bytes %lld",
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bud->lnum, bud->start, dbg_jhead(bud->jhead),
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c->leb_size - bud->start, c->cmt_bud_bytes);
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rb_erase(p1, &c->buds);
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/*
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* If the commit does not finish, the recovery will need
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* to replay the journal, in which case the old buds
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* must be unchanged. Do not release them until post
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* commit i.e. do not allow them to be garbage
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* collected.
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*/
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list_move(&bud->list, &c->old_buds);
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}
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}
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spin_unlock(&c->buds_lock);
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}
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/**
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* ubifs_log_start_commit - start commit.
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* @c: UBIFS file-system description object
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* @ltail_lnum: return new log tail LEB number
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*
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* The commit operation starts with writing "commit start" node to the log and
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* reference nodes for all journal heads which will define new journal after
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* the commit has been finished. The commit start and reference nodes are
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* written in one go to the nearest empty log LEB (hence, when commit is
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* finished UBIFS may safely unmap all the previous log LEBs). This function
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* returns zero in case of success and a negative error code in case of
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* failure.
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*/
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int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
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{
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void *buf;
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struct ubifs_cs_node *cs;
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struct ubifs_ref_node *ref;
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int err, i, max_len, len;
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err = dbg_check_bud_bytes(c);
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if (err)
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return err;
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max_len = UBIFS_CS_NODE_SZ + c->jhead_cnt * UBIFS_REF_NODE_SZ;
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max_len = ALIGN(max_len, c->min_io_size);
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buf = cs = kmalloc(max_len, GFP_NOFS);
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if (!buf)
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return -ENOMEM;
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cs->ch.node_type = UBIFS_CS_NODE;
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cs->cmt_no = cpu_to_le64(c->cmt_no);
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ubifs_prepare_node(c, cs, UBIFS_CS_NODE_SZ, 0);
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/*
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* Note, we do not lock 'c->log_mutex' because this is the commit start
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* phase and we are exclusively using the log. And we do not lock
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* write-buffer because nobody can write to the file-system at this
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* phase.
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*/
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len = UBIFS_CS_NODE_SZ;
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for (i = 0; i < c->jhead_cnt; i++) {
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int lnum = c->jheads[i].wbuf.lnum;
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int offs = c->jheads[i].wbuf.offs;
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|
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if (lnum == -1 || offs == c->leb_size)
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continue;
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dbg_log("add ref to LEB %d:%d for jhead %s",
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lnum, offs, dbg_jhead(i));
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ref = buf + len;
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ref->ch.node_type = UBIFS_REF_NODE;
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ref->lnum = cpu_to_le32(lnum);
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ref->offs = cpu_to_le32(offs);
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ref->jhead = cpu_to_le32(i);
|
|
|
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ubifs_prepare_node(c, ref, UBIFS_REF_NODE_SZ, 0);
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len += UBIFS_REF_NODE_SZ;
|
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}
|
|
|
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ubifs_pad(c, buf + len, ALIGN(len, c->min_io_size) - len);
|
|
|
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/* Switch to the next log LEB */
|
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if (c->lhead_offs) {
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c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
|
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ubifs_assert(c->lhead_lnum != c->ltail_lnum);
|
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c->lhead_offs = 0;
|
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}
|
|
|
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/* Must ensure next LEB has been unmapped */
|
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err = ubifs_leb_unmap(c, c->lhead_lnum);
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if (err)
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goto out;
|
|
|
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len = ALIGN(len, c->min_io_size);
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dbg_log("writing commit start at LEB %d:0, len %d", c->lhead_lnum, len);
|
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err = ubifs_leb_write(c, c->lhead_lnum, cs, 0, len);
|
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if (err)
|
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goto out;
|
|
|
|
*ltail_lnum = c->lhead_lnum;
|
|
|
|
c->lhead_offs += len;
|
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if (c->lhead_offs == c->leb_size) {
|
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c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
|
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c->lhead_offs = 0;
|
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}
|
|
|
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remove_buds(c);
|
|
|
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/*
|
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* We have started the commit and now users may use the rest of the log
|
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* for new writes.
|
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*/
|
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c->min_log_bytes = 0;
|
|
|
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out:
|
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kfree(buf);
|
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return err;
|
|
}
|
|
|
|
/**
|
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* ubifs_log_end_commit - end commit.
|
|
* @c: UBIFS file-system description object
|
|
* @ltail_lnum: new log tail LEB number
|
|
*
|
|
* This function is called on when the commit operation was finished. It
|
|
* moves log tail to new position and updates the master node so that it stores
|
|
* the new log tail LEB number. Returns zero in case of success and a negative
|
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* error code in case of failure.
|
|
*/
|
|
int ubifs_log_end_commit(struct ubifs_info *c, int ltail_lnum)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* At this phase we have to lock 'c->log_mutex' because UBIFS allows FS
|
|
* writes during commit. Its only short "commit" start phase when
|
|
* writers are blocked.
|
|
*/
|
|
mutex_lock(&c->log_mutex);
|
|
|
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dbg_log("old tail was LEB %d:0, new tail is LEB %d:0",
|
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c->ltail_lnum, ltail_lnum);
|
|
|
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c->ltail_lnum = ltail_lnum;
|
|
/*
|
|
* The commit is finished and from now on it must be guaranteed that
|
|
* there is always enough space for the next commit.
|
|
*/
|
|
c->min_log_bytes = c->leb_size;
|
|
|
|
spin_lock(&c->buds_lock);
|
|
c->bud_bytes -= c->cmt_bud_bytes;
|
|
spin_unlock(&c->buds_lock);
|
|
|
|
err = dbg_check_bud_bytes(c);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = ubifs_write_master(c);
|
|
|
|
out:
|
|
mutex_unlock(&c->log_mutex);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubifs_log_post_commit - things to do after commit is completed.
|
|
* @c: UBIFS file-system description object
|
|
* @old_ltail_lnum: old log tail LEB number
|
|
*
|
|
* Release buds only after commit is completed, because they must be unchanged
|
|
* if recovery is needed.
|
|
*
|
|
* Unmap log LEBs only after commit is completed, because they may be needed for
|
|
* recovery.
|
|
*
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
*/
|
|
int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum)
|
|
{
|
|
int lnum, err = 0;
|
|
|
|
while (!list_empty(&c->old_buds)) {
|
|
struct ubifs_bud *bud;
|
|
|
|
bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
|
|
err = ubifs_return_leb(c, bud->lnum);
|
|
if (err)
|
|
return err;
|
|
list_del(&bud->list);
|
|
kfree(bud);
|
|
}
|
|
mutex_lock(&c->log_mutex);
|
|
for (lnum = old_ltail_lnum; lnum != c->ltail_lnum;
|
|
lnum = ubifs_next_log_lnum(c, lnum)) {
|
|
dbg_log("unmap log LEB %d", lnum);
|
|
err = ubifs_leb_unmap(c, lnum);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
out:
|
|
mutex_unlock(&c->log_mutex);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* struct done_ref - references that have been done.
|
|
* @rb: rb-tree node
|
|
* @lnum: LEB number
|
|
*/
|
|
struct done_ref {
|
|
struct rb_node rb;
|
|
int lnum;
|
|
};
|
|
|
|
/**
|
|
* done_already - determine if a reference has been done already.
|
|
* @done_tree: rb-tree to store references that have been done
|
|
* @lnum: LEB number of reference
|
|
*
|
|
* This function returns %1 if the reference has been done, %0 if not, otherwise
|
|
* a negative error code is returned.
|
|
*/
|
|
static int done_already(struct rb_root *done_tree, int lnum)
|
|
{
|
|
struct rb_node **p = &done_tree->rb_node, *parent = NULL;
|
|
struct done_ref *dr;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
dr = rb_entry(parent, struct done_ref, rb);
|
|
if (lnum < dr->lnum)
|
|
p = &(*p)->rb_left;
|
|
else if (lnum > dr->lnum)
|
|
p = &(*p)->rb_right;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
dr = kzalloc(sizeof(struct done_ref), GFP_NOFS);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
dr->lnum = lnum;
|
|
|
|
rb_link_node(&dr->rb, parent, p);
|
|
rb_insert_color(&dr->rb, done_tree);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* destroy_done_tree - destroy the done tree.
|
|
* @done_tree: done tree to destroy
|
|
*/
|
|
static void destroy_done_tree(struct rb_root *done_tree)
|
|
{
|
|
struct done_ref *dr, *n;
|
|
|
|
rbtree_postorder_for_each_entry_safe(dr, n, done_tree, rb)
|
|
kfree(dr);
|
|
}
|
|
|
|
/**
|
|
* add_node - add a node to the consolidated log.
|
|
* @c: UBIFS file-system description object
|
|
* @buf: buffer to which to add
|
|
* @lnum: LEB number to which to write is passed and returned here
|
|
* @offs: offset to where to write is passed and returned here
|
|
* @node: node to add
|
|
*
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
*/
|
|
static int add_node(struct ubifs_info *c, void *buf, int *lnum, int *offs,
|
|
void *node)
|
|
{
|
|
struct ubifs_ch *ch = node;
|
|
int len = le32_to_cpu(ch->len), remains = c->leb_size - *offs;
|
|
|
|
if (len > remains) {
|
|
int sz = ALIGN(*offs, c->min_io_size), err;
|
|
|
|
ubifs_pad(c, buf + *offs, sz - *offs);
|
|
err = ubifs_leb_change(c, *lnum, buf, sz);
|
|
if (err)
|
|
return err;
|
|
*lnum = ubifs_next_log_lnum(c, *lnum);
|
|
*offs = 0;
|
|
}
|
|
memcpy(buf + *offs, node, len);
|
|
*offs += ALIGN(len, 8);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ubifs_consolidate_log - consolidate the log.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* Repeated failed commits could cause the log to be full, but at least 1 LEB is
|
|
* needed for commit. This function rewrites the reference nodes in the log
|
|
* omitting duplicates, and failed CS nodes, and leaving no gaps.
|
|
*
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
*/
|
|
int ubifs_consolidate_log(struct ubifs_info *c)
|
|
{
|
|
struct ubifs_scan_leb *sleb;
|
|
struct ubifs_scan_node *snod;
|
|
struct rb_root done_tree = RB_ROOT;
|
|
int lnum, err, first = 1, write_lnum, offs = 0;
|
|
void *buf;
|
|
|
|
dbg_rcvry("log tail LEB %d, log head LEB %d", c->ltail_lnum,
|
|
c->lhead_lnum);
|
|
buf = vmalloc(c->leb_size);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
lnum = c->ltail_lnum;
|
|
write_lnum = lnum;
|
|
while (1) {
|
|
sleb = ubifs_scan(c, lnum, 0, c->sbuf, 0);
|
|
if (IS_ERR(sleb)) {
|
|
err = PTR_ERR(sleb);
|
|
goto out_free;
|
|
}
|
|
list_for_each_entry(snod, &sleb->nodes, list) {
|
|
switch (snod->type) {
|
|
case UBIFS_REF_NODE: {
|
|
struct ubifs_ref_node *ref = snod->node;
|
|
int ref_lnum = le32_to_cpu(ref->lnum);
|
|
|
|
err = done_already(&done_tree, ref_lnum);
|
|
if (err < 0)
|
|
goto out_scan;
|
|
if (err != 1) {
|
|
err = add_node(c, buf, &write_lnum,
|
|
&offs, snod->node);
|
|
if (err)
|
|
goto out_scan;
|
|
}
|
|
break;
|
|
}
|
|
case UBIFS_CS_NODE:
|
|
if (!first)
|
|
break;
|
|
err = add_node(c, buf, &write_lnum, &offs,
|
|
snod->node);
|
|
if (err)
|
|
goto out_scan;
|
|
first = 0;
|
|
break;
|
|
}
|
|
}
|
|
ubifs_scan_destroy(sleb);
|
|
if (lnum == c->lhead_lnum)
|
|
break;
|
|
lnum = ubifs_next_log_lnum(c, lnum);
|
|
}
|
|
if (offs) {
|
|
int sz = ALIGN(offs, c->min_io_size);
|
|
|
|
ubifs_pad(c, buf + offs, sz - offs);
|
|
err = ubifs_leb_change(c, write_lnum, buf, sz);
|
|
if (err)
|
|
goto out_free;
|
|
offs = ALIGN(offs, c->min_io_size);
|
|
}
|
|
destroy_done_tree(&done_tree);
|
|
vfree(buf);
|
|
if (write_lnum == c->lhead_lnum) {
|
|
ubifs_err(c, "log is too full");
|
|
return -EINVAL;
|
|
}
|
|
/* Unmap remaining LEBs */
|
|
lnum = write_lnum;
|
|
do {
|
|
lnum = ubifs_next_log_lnum(c, lnum);
|
|
err = ubifs_leb_unmap(c, lnum);
|
|
if (err)
|
|
return err;
|
|
} while (lnum != c->lhead_lnum);
|
|
c->lhead_lnum = write_lnum;
|
|
c->lhead_offs = offs;
|
|
dbg_rcvry("new log head at %d:%d", c->lhead_lnum, c->lhead_offs);
|
|
return 0;
|
|
|
|
out_scan:
|
|
ubifs_scan_destroy(sleb);
|
|
out_free:
|
|
destroy_done_tree(&done_tree);
|
|
vfree(buf);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* dbg_check_bud_bytes - make sure bud bytes calculation are all right.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* This function makes sure the amount of flash space used by closed buds
|
|
* ('c->bud_bytes' is correct). Returns zero in case of success and %-EINVAL in
|
|
* case of failure.
|
|
*/
|
|
static int dbg_check_bud_bytes(struct ubifs_info *c)
|
|
{
|
|
int i, err = 0;
|
|
struct ubifs_bud *bud;
|
|
long long bud_bytes = 0;
|
|
|
|
if (!dbg_is_chk_gen(c))
|
|
return 0;
|
|
|
|
spin_lock(&c->buds_lock);
|
|
for (i = 0; i < c->jhead_cnt; i++)
|
|
list_for_each_entry(bud, &c->jheads[i].buds_list, list)
|
|
bud_bytes += c->leb_size - bud->start;
|
|
|
|
if (c->bud_bytes != bud_bytes) {
|
|
ubifs_err(c, "bad bud_bytes %lld, calculated %lld",
|
|
c->bud_bytes, bud_bytes);
|
|
err = -EINVAL;
|
|
}
|
|
spin_unlock(&c->buds_lock);
|
|
|
|
return err;
|
|
}
|