mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 17:58:23 +00:00
9eefe2a2b3
The U-Boot UBIFS implementation is largely a direct copy from the current Linux version (2.6.29-rc6). As already done in the UBI version we have an "abstraction layer" to redefine or remove some OS calls (e.g. mutex_lock() ...). This makes it possible to use the original Linux code with very little changes. And by this we can better update to later Linux versions. I removed some of the Linux features that are not used in the U-Boot version (e.g. garbage-collection, write support). Signed-off-by: Stefan Roese <sr@denx.de> CC: Artem Bityutskiy <dedekind@infradead.org> CC: Adrian Hunter <ext-Adrian.Hunter@nokia.com>
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*
|
|
* This file is part of UBIFS.
|
|
*
|
|
* Copyright (C) 2006-2008 Nokia Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc., 51
|
|
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "ubifs.h"
|
|
|
|
/**
|
|
* 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_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->vfs_sb->s_flags & MS_RDONLY));
|
|
|
|
/*
|
|
* 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 %d, bud_bytes %lld", bud->lnum,
|
|
bud->start, bud->jhead, c->bud_bytes);
|
|
spin_unlock(&c->buds_lock);
|
|
}
|