/*
|
* This file is part of UBIFS.
|
*
|
* Copyright (C) 2006-2008 Nokia Corporation.
|
*
|
* SPDX-License-Identifier: GPL-2.0+
|
*
|
* Authors: Artem Bityutskiy (Битюцкий Артём)
|
* Adrian Hunter
|
*/
|
|
/*
|
* This file is a part of UBIFS journal implementation and contains various
|
* functions which manipulate the log. The log is a fixed area on the flash
|
* which does not contain any data but refers to buds. The log is a part of the
|
* journal.
|
*/
|
|
#ifdef __UBOOT__
|
#include <linux/err.h>
|
#endif
|
#include "ubifs.h"
|
|
static int dbg_check_bud_bytes(struct ubifs_info *c);
|
|
/**
|
* ubifs_search_bud - search bud LEB.
|
* @c: UBIFS file-system description object
|
* @lnum: logical eraseblock number to search
|
*
|
* This function searches bud LEB @lnum. Returns bud description object in case
|
* of success and %NULL if there is no bud with this LEB number.
|
*/
|
struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum)
|
{
|
struct rb_node *p;
|
struct ubifs_bud *bud;
|
|
spin_lock(&c->buds_lock);
|
p = c->buds.rb_node;
|
while (p) {
|
bud = rb_entry(p, struct ubifs_bud, rb);
|
if (lnum < bud->lnum)
|
p = p->rb_left;
|
else if (lnum > bud->lnum)
|
p = p->rb_right;
|
else {
|
spin_unlock(&c->buds_lock);
|
return bud;
|
}
|
}
|
spin_unlock(&c->buds_lock);
|
return NULL;
|
}
|
|
/**
|
* ubifs_get_wbuf - get the wbuf associated with a LEB, if there is one.
|
* @c: UBIFS file-system description object
|
* @lnum: logical eraseblock number to search
|
*
|
* This functions returns the wbuf for @lnum or %NULL if there is not one.
|
*/
|
struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum)
|
{
|
struct rb_node *p;
|
struct ubifs_bud *bud;
|
int jhead;
|
|
if (!c->jheads)
|
return NULL;
|
|
spin_lock(&c->buds_lock);
|
p = c->buds.rb_node;
|
while (p) {
|
bud = rb_entry(p, struct ubifs_bud, rb);
|
if (lnum < bud->lnum)
|
p = p->rb_left;
|
else if (lnum > bud->lnum)
|
p = p->rb_right;
|
else {
|
jhead = bud->jhead;
|
spin_unlock(&c->buds_lock);
|
return &c->jheads[jhead].wbuf;
|
}
|
}
|
spin_unlock(&c->buds_lock);
|
return NULL;
|
}
|
|
/**
|
* empty_log_bytes - calculate amount of empty space in the log.
|
* @c: UBIFS file-system description object
|
*/
|
static inline long long empty_log_bytes(const struct ubifs_info *c)
|
{
|
long long h, t;
|
|
h = (long long)c->lhead_lnum * c->leb_size + c->lhead_offs;
|
t = (long long)c->ltail_lnum * c->leb_size;
|
|
if (h > t)
|
return c->log_bytes - h + t;
|
else if (h != t)
|
return t - h;
|
else if (c->lhead_lnum != c->ltail_lnum)
|
return 0;
|
else
|
return c->log_bytes;
|
}
|
|
/**
|
* ubifs_add_bud - add bud LEB to the tree of buds and its journal head list.
|
* @c: UBIFS file-system description object
|
* @bud: the bud to add
|
*/
|
void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud)
|
{
|
struct rb_node **p, *parent = NULL;
|
struct ubifs_bud *b;
|
struct ubifs_jhead *jhead;
|
|
spin_lock(&c->buds_lock);
|
p = &c->buds.rb_node;
|
while (*p) {
|
parent = *p;
|
b = rb_entry(parent, struct ubifs_bud, rb);
|
ubifs_assert(bud->lnum != b->lnum);
|
if (bud->lnum < b->lnum)
|
p = &(*p)->rb_left;
|
else
|
p = &(*p)->rb_right;
|
}
|
|
rb_link_node(&bud->rb, parent, p);
|
rb_insert_color(&bud->rb, &c->buds);
|
if (c->jheads) {
|
jhead = &c->jheads[bud->jhead];
|
list_add_tail(&bud->list, &jhead->buds_list);
|
} else
|
ubifs_assert(c->replaying && c->ro_mount);
|
|
/*
|
* Note, although this is a new bud, we anyway account this space now,
|
* before any data has been written to it, because this is about to
|
* guarantee fixed mount time, and this bud will anyway be read and
|
* scanned.
|
*/
|
c->bud_bytes += c->leb_size - bud->start;
|
|
dbg_log("LEB %d:%d, jhead %s, bud_bytes %lld", bud->lnum,
|
bud->start, dbg_jhead(bud->jhead), c->bud_bytes);
|
spin_unlock(&c->buds_lock);
|
}
|
|
/**
|
* ubifs_add_bud_to_log - add a new bud to the log.
|
* @c: UBIFS file-system description object
|
* @jhead: journal head the bud belongs to
|
* @lnum: LEB number of the bud
|
* @offs: starting offset of the bud
|
*
|
* This function writes reference node for the new bud LEB @lnum it to the log,
|
* and adds it to the buds tress. It also makes sure that log size does not
|
* exceed the 'c->max_bud_bytes' limit. Returns zero in case of success,
|
* %-EAGAIN if commit is required, and a negative error codes in case of
|
* failure.
|
*/
|
int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs)
|
{
|
int err;
|
struct ubifs_bud *bud;
|
struct ubifs_ref_node *ref;
|
|
bud = kmalloc(sizeof(struct ubifs_bud), GFP_NOFS);
|
if (!bud)
|
return -ENOMEM;
|
ref = kzalloc(c->ref_node_alsz, GFP_NOFS);
|
if (!ref) {
|
kfree(bud);
|
return -ENOMEM;
|
}
|
|
mutex_lock(&c->log_mutex);
|
ubifs_assert(!c->ro_media && !c->ro_mount);
|
if (c->ro_error) {
|
err = -EROFS;
|
goto out_unlock;
|
}
|
|
/* Make sure we have enough space in the log */
|
if (empty_log_bytes(c) - c->ref_node_alsz < c->min_log_bytes) {
|
dbg_log("not enough log space - %lld, required %d",
|
empty_log_bytes(c), c->min_log_bytes);
|
ubifs_commit_required(c);
|
err = -EAGAIN;
|
goto out_unlock;
|
}
|
|
/*
|
* Make sure the amount of space in buds will not exceed the
|
* 'c->max_bud_bytes' limit, because we want to guarantee mount time
|
* limits.
|
*
|
* It is not necessary to hold @c->buds_lock when reading @c->bud_bytes
|
* because we are holding @c->log_mutex. All @c->bud_bytes take place
|
* when both @c->log_mutex and @c->bud_bytes are locked.
|
*/
|
if (c->bud_bytes + c->leb_size - offs > c->max_bud_bytes) {
|
dbg_log("bud bytes %lld (%lld max), require commit",
|
c->bud_bytes, c->max_bud_bytes);
|
ubifs_commit_required(c);
|
err = -EAGAIN;
|
goto out_unlock;
|
}
|
|
/*
|
* If the journal is full enough - start background commit. Note, it is
|
* OK to read 'c->cmt_state' without spinlock because integer reads
|
* are atomic in the kernel.
|
*/
|
if (c->bud_bytes >= c->bg_bud_bytes &&
|
c->cmt_state == COMMIT_RESTING) {
|
dbg_log("bud bytes %lld (%lld max), initiate BG commit",
|
c->bud_bytes, c->max_bud_bytes);
|
ubifs_request_bg_commit(c);
|
}
|
|
bud->lnum = lnum;
|
bud->start = offs;
|
bud->jhead = jhead;
|
|
ref->ch.node_type = UBIFS_REF_NODE;
|
ref->lnum = cpu_to_le32(bud->lnum);
|
ref->offs = cpu_to_le32(bud->start);
|
ref->jhead = cpu_to_le32(jhead);
|
|
if (c->lhead_offs > c->leb_size - c->ref_node_alsz) {
|
c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
|
ubifs_assert(c->lhead_lnum != c->ltail_lnum);
|
c->lhead_offs = 0;
|
}
|
|
if (c->lhead_offs == 0) {
|
/* Must ensure next log LEB has been unmapped */
|
err = ubifs_leb_unmap(c, c->lhead_lnum);
|
if (err)
|
goto out_unlock;
|
}
|
|
if (bud->start == 0) {
|
/*
|
* Before writing the LEB reference which refers an empty LEB
|
* to the log, we have to make sure it is mapped, because
|
* otherwise we'd risk to refer an LEB with garbage in case of
|
* an unclean reboot, because the target LEB might have been
|
* unmapped, but not yet physically erased.
|
*/
|
err = ubifs_leb_map(c, bud->lnum);
|
if (err)
|
goto out_unlock;
|
}
|
|
dbg_log("write ref LEB %d:%d",
|
c->lhead_lnum, c->lhead_offs);
|
err = ubifs_write_node(c, ref, UBIFS_REF_NODE_SZ, c->lhead_lnum,
|
c->lhead_offs);
|
if (err)
|
goto out_unlock;
|
|
c->lhead_offs += c->ref_node_alsz;
|
|
ubifs_add_bud(c, bud);
|
|
mutex_unlock(&c->log_mutex);
|
kfree(ref);
|
return 0;
|
|
out_unlock:
|
mutex_unlock(&c->log_mutex);
|
kfree(ref);
|
kfree(bud);
|
return err;
|
}
|
|
/**
|
* remove_buds - remove used buds.
|
* @c: UBIFS file-system description object
|
*
|
* This function removes use buds from the buds tree. It does not remove the
|
* buds which are pointed to by journal heads.
|
*/
|
static void remove_buds(struct ubifs_info *c)
|
{
|
struct rb_node *p;
|
|
ubifs_assert(list_empty(&c->old_buds));
|
c->cmt_bud_bytes = 0;
|
spin_lock(&c->buds_lock);
|
p = rb_first(&c->buds);
|
while (p) {
|
struct rb_node *p1 = p;
|
struct ubifs_bud *bud;
|
struct ubifs_wbuf *wbuf;
|
|
p = rb_next(p);
|
bud = rb_entry(p1, struct ubifs_bud, rb);
|
wbuf = &c->jheads[bud->jhead].wbuf;
|
|
if (wbuf->lnum == bud->lnum) {
|
/*
|
* Do not remove buds which are pointed to by journal
|
* heads (non-closed buds).
|
*/
|
c->cmt_bud_bytes += wbuf->offs - bud->start;
|
dbg_log("preserve %d:%d, jhead %s, bud bytes %d, cmt_bud_bytes %lld",
|
bud->lnum, bud->start, dbg_jhead(bud->jhead),
|
wbuf->offs - bud->start, c->cmt_bud_bytes);
|
bud->start = wbuf->offs;
|
} else {
|
c->cmt_bud_bytes += c->leb_size - bud->start;
|
dbg_log("remove %d:%d, jhead %s, bud bytes %d, cmt_bud_bytes %lld",
|
bud->lnum, bud->start, dbg_jhead(bud->jhead),
|
c->leb_size - bud->start, c->cmt_bud_bytes);
|
rb_erase(p1, &c->buds);
|
/*
|
* If the commit does not finish, the recovery will need
|
* to replay the journal, in which case the old buds
|
* must be unchanged. Do not release them until post
|
* commit i.e. do not allow them to be garbage
|
* collected.
|
*/
|
list_move(&bud->list, &c->old_buds);
|
}
|
}
|
spin_unlock(&c->buds_lock);
|
}
|
|
/**
|
* ubifs_log_start_commit - start commit.
|
* @c: UBIFS file-system description object
|
* @ltail_lnum: return new log tail LEB number
|
*
|
* The commit operation starts with writing "commit start" node to the log and
|
* reference nodes for all journal heads which will define new journal after
|
* the commit has been finished. The commit start and reference nodes are
|
* written in one go to the nearest empty log LEB (hence, when commit is
|
* finished UBIFS may safely unmap all the previous log LEBs). This function
|
* returns zero in case of success and a negative error code in case of
|
* failure.
|
*/
|
int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
|
{
|
void *buf;
|
struct ubifs_cs_node *cs;
|
struct ubifs_ref_node *ref;
|
int err, i, max_len, len;
|
|
err = dbg_check_bud_bytes(c);
|
if (err)
|
return err;
|
|
max_len = UBIFS_CS_NODE_SZ + c->jhead_cnt * UBIFS_REF_NODE_SZ;
|
max_len = ALIGN(max_len, c->min_io_size);
|
buf = cs = kmalloc(max_len, GFP_NOFS);
|
if (!buf)
|
return -ENOMEM;
|
|
cs->ch.node_type = UBIFS_CS_NODE;
|
cs->cmt_no = cpu_to_le64(c->cmt_no);
|
ubifs_prepare_node(c, cs, UBIFS_CS_NODE_SZ, 0);
|
|
/*
|
* Note, we do not lock 'c->log_mutex' because this is the commit start
|
* phase and we are exclusively using the log. And we do not lock
|
* write-buffer because nobody can write to the file-system at this
|
* phase.
|
*/
|
|
len = UBIFS_CS_NODE_SZ;
|
for (i = 0; i < c->jhead_cnt; i++) {
|
int lnum = c->jheads[i].wbuf.lnum;
|
int offs = c->jheads[i].wbuf.offs;
|
|
if (lnum == -1 || offs == c->leb_size)
|
continue;
|
|
dbg_log("add ref to LEB %d:%d for jhead %s",
|
lnum, offs, dbg_jhead(i));
|
ref = buf + len;
|
ref->ch.node_type = UBIFS_REF_NODE;
|
ref->lnum = cpu_to_le32(lnum);
|
ref->offs = cpu_to_le32(offs);
|
ref->jhead = cpu_to_le32(i);
|
|
ubifs_prepare_node(c, ref, UBIFS_REF_NODE_SZ, 0);
|
len += UBIFS_REF_NODE_SZ;
|
}
|
|
ubifs_pad(c, buf + len, ALIGN(len, c->min_io_size) - len);
|
|
/* Switch to the next log LEB */
|
if (c->lhead_offs) {
|
c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
|
ubifs_assert(c->lhead_lnum != c->ltail_lnum);
|
c->lhead_offs = 0;
|
}
|
|
/* Must ensure next LEB has been unmapped */
|
err = ubifs_leb_unmap(c, c->lhead_lnum);
|
if (err)
|
goto out;
|
|
len = ALIGN(len, c->min_io_size);
|
dbg_log("writing commit start at LEB %d:0, len %d", c->lhead_lnum, len);
|
err = ubifs_leb_write(c, c->lhead_lnum, cs, 0, len);
|
if (err)
|
goto out;
|
|
*ltail_lnum = c->lhead_lnum;
|
|
c->lhead_offs += len;
|
if (c->lhead_offs == c->leb_size) {
|
c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
|
c->lhead_offs = 0;
|
}
|
|
remove_buds(c);
|
|
/*
|
* We have started the commit and now users may use the rest of the log
|
* for new writes.
|
*/
|
c->min_log_bytes = 0;
|
|
out:
|
kfree(buf);
|
return err;
|
}
|
|
/**
|
* 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
|
* 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);
|
|
dbg_log("old tail was LEB %d:0, new tail is LEB %d:0",
|
c->ltail_lnum, ltail_lnum);
|
|
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;
|
}
|
