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105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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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#include "ubifs.h"
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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_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->vfs_sb->s_flags & MS_RDONLY));
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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 %d, bud_bytes %lld", bud->lnum,
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bud->start, bud->jhead, c->bud_bytes);
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spin_unlock(&c->buds_lock);
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}
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