2008-07-14 12:08:37 -04:00
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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: Adrian Hunter
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* Artem Bityutskiy (Битюцкий Артём)
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*/
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/* This file implements TNC functions for committing */
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#include "ubifs.h"
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/**
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* make_idx_node - make an index node for fill-the-gaps method of TNC commit.
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* @c: UBIFS file-system description object
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* @idx: buffer in which to place new index node
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* @znode: znode from which to make new index node
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* @lnum: LEB number where new index node will be written
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* @offs: offset where new index node will be written
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* @len: length of new index node
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*/
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static int make_idx_node(struct ubifs_info *c, struct ubifs_idx_node *idx,
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struct ubifs_znode *znode, int lnum, int offs, int len)
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{
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struct ubifs_znode *zp;
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int i, err;
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/* Make index node */
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idx->ch.node_type = UBIFS_IDX_NODE;
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idx->child_cnt = cpu_to_le16(znode->child_cnt);
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idx->level = cpu_to_le16(znode->level);
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for (i = 0; i < znode->child_cnt; i++) {
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struct ubifs_branch *br = ubifs_idx_branch(c, idx, i);
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struct ubifs_zbranch *zbr = &znode->zbranch[i];
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key_write_idx(c, &zbr->key, &br->key);
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br->lnum = cpu_to_le32(zbr->lnum);
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br->offs = cpu_to_le32(zbr->offs);
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br->len = cpu_to_le32(zbr->len);
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if (!zbr->lnum || !zbr->len) {
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ubifs_err("bad ref in znode");
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dbg_dump_znode(c, znode);
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if (zbr->znode)
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dbg_dump_znode(c, zbr->znode);
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}
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}
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ubifs_prepare_node(c, idx, len, 0);
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#ifdef CONFIG_UBIFS_FS_DEBUG
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znode->lnum = lnum;
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znode->offs = offs;
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znode->len = len;
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#endif
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err = insert_old_idx_znode(c, znode);
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/* Update the parent */
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zp = znode->parent;
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if (zp) {
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struct ubifs_zbranch *zbr;
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zbr = &zp->zbranch[znode->iip];
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zbr->lnum = lnum;
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zbr->offs = offs;
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zbr->len = len;
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} else {
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c->zroot.lnum = lnum;
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c->zroot.offs = offs;
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c->zroot.len = len;
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}
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c->calc_idx_sz += ALIGN(len, 8);
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atomic_long_dec(&c->dirty_zn_cnt);
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ubifs_assert(ubifs_zn_dirty(znode));
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ubifs_assert(test_bit(COW_ZNODE, &znode->flags));
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__clear_bit(DIRTY_ZNODE, &znode->flags);
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__clear_bit(COW_ZNODE, &znode->flags);
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return err;
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}
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/**
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* fill_gap - make index nodes in gaps in dirty index LEBs.
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* @c: UBIFS file-system description object
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* @lnum: LEB number that gap appears in
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* @gap_start: offset of start of gap
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* @gap_end: offset of end of gap
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* @dirt: adds dirty space to this
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*
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* This function returns the number of index nodes written into the gap.
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*/
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static int fill_gap(struct ubifs_info *c, int lnum, int gap_start, int gap_end,
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int *dirt)
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{
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int len, gap_remains, gap_pos, written, pad_len;
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ubifs_assert((gap_start & 7) == 0);
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ubifs_assert((gap_end & 7) == 0);
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ubifs_assert(gap_end >= gap_start);
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gap_remains = gap_end - gap_start;
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if (!gap_remains)
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return 0;
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gap_pos = gap_start;
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written = 0;
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while (c->enext) {
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len = ubifs_idx_node_sz(c, c->enext->child_cnt);
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if (len < gap_remains) {
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struct ubifs_znode *znode = c->enext;
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const int alen = ALIGN(len, 8);
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int err;
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ubifs_assert(alen <= gap_remains);
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err = make_idx_node(c, c->ileb_buf + gap_pos, znode,
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lnum, gap_pos, len);
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if (err)
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return err;
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gap_remains -= alen;
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gap_pos += alen;
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c->enext = znode->cnext;
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if (c->enext == c->cnext)
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c->enext = NULL;
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written += 1;
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} else
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break;
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}
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if (gap_end == c->leb_size) {
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c->ileb_len = ALIGN(gap_pos, c->min_io_size);
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/* Pad to end of min_io_size */
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pad_len = c->ileb_len - gap_pos;
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} else
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/* Pad to end of gap */
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pad_len = gap_remains;
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dbg_gc("LEB %d:%d to %d len %d nodes written %d wasted bytes %d",
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lnum, gap_start, gap_end, gap_end - gap_start, written, pad_len);
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ubifs_pad(c, c->ileb_buf + gap_pos, pad_len);
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*dirt += pad_len;
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return written;
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}
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/**
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* find_old_idx - find an index node obsoleted since the last commit start.
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* @c: UBIFS file-system description object
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* @lnum: LEB number of obsoleted index node
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* @offs: offset of obsoleted index node
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*
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* Returns %1 if found and %0 otherwise.
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*/
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static int find_old_idx(struct ubifs_info *c, int lnum, int offs)
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{
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struct ubifs_old_idx *o;
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struct rb_node *p;
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p = c->old_idx.rb_node;
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while (p) {
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o = rb_entry(p, struct ubifs_old_idx, rb);
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if (lnum < o->lnum)
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p = p->rb_left;
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else if (lnum > o->lnum)
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p = p->rb_right;
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else if (offs < o->offs)
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p = p->rb_left;
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else if (offs > o->offs)
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p = p->rb_right;
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else
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return 1;
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}
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return 0;
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}
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/**
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* is_idx_node_in_use - determine if an index node can be overwritten.
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* @c: UBIFS file-system description object
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* @key: key of index node
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* @level: index node level
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* @lnum: LEB number of index node
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* @offs: offset of index node
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*
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* If @key / @lnum / @offs identify an index node that was not part of the old
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* index, then this function returns %0 (obsolete). Else if the index node was
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* part of the old index but is now dirty %1 is returned, else if it is clean %2
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* is returned. A negative error code is returned on failure.
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*/
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static int is_idx_node_in_use(struct ubifs_info *c, union ubifs_key *key,
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int level, int lnum, int offs)
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{
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int ret;
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ret = is_idx_node_in_tnc(c, key, level, lnum, offs);
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if (ret < 0)
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return ret; /* Error code */
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if (ret == 0)
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if (find_old_idx(c, lnum, offs))
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return 1;
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return ret;
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}
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/**
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* layout_leb_in_gaps - layout index nodes using in-the-gaps method.
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* @c: UBIFS file-system description object
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* @p: return LEB number here
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*
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* This function lays out new index nodes for dirty znodes using in-the-gaps
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* method of TNC commit.
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* This function merely puts the next znode into the next gap, making no attempt
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* to try to maximise the number of znodes that fit.
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* This function returns the number of index nodes written into the gaps, or a
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* negative error code on failure.
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*/
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static int layout_leb_in_gaps(struct ubifs_info *c, int *p)
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{
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struct ubifs_scan_leb *sleb;
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struct ubifs_scan_node *snod;
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int lnum, dirt = 0, gap_start, gap_end, err, written, tot_written;
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tot_written = 0;
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/* Get an index LEB with lots of obsolete index nodes */
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lnum = ubifs_find_dirty_idx_leb(c);
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if (lnum < 0)
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/*
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* There also may be dirt in the index head that could be
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* filled, however we do not check there at present.
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*/
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return lnum; /* Error code */
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*p = lnum;
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dbg_gc("LEB %d", lnum);
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/*
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* Scan the index LEB. We use the generic scan for this even though
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* it is more comprehensive and less efficient than is needed for this
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* purpose.
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*/
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sleb = ubifs_scan(c, lnum, 0, c->ileb_buf);
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c->ileb_len = 0;
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if (IS_ERR(sleb))
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return PTR_ERR(sleb);
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gap_start = 0;
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list_for_each_entry(snod, &sleb->nodes, list) {
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struct ubifs_idx_node *idx;
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int in_use, level;
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ubifs_assert(snod->type == UBIFS_IDX_NODE);
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idx = snod->node;
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key_read(c, ubifs_idx_key(c, idx), &snod->key);
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level = le16_to_cpu(idx->level);
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/* Determine if the index node is in use (not obsolete) */
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in_use = is_idx_node_in_use(c, &snod->key, level, lnum,
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snod->offs);
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if (in_use < 0) {
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ubifs_scan_destroy(sleb);
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return in_use; /* Error code */
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}
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if (in_use) {
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if (in_use == 1)
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dirt += ALIGN(snod->len, 8);
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/*
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* The obsolete index nodes form gaps that can be
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* overwritten. This gap has ended because we have
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* found an index node that is still in use
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* i.e. not obsolete
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*/
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gap_end = snod->offs;
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/* Try to fill gap */
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written = fill_gap(c, lnum, gap_start, gap_end, &dirt);
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if (written < 0) {
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ubifs_scan_destroy(sleb);
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return written; /* Error code */
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}
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tot_written += written;
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gap_start = ALIGN(snod->offs + snod->len, 8);
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}
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}
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ubifs_scan_destroy(sleb);
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c->ileb_len = c->leb_size;
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gap_end = c->leb_size;
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/* Try to fill gap */
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written = fill_gap(c, lnum, gap_start, gap_end, &dirt);
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if (written < 0)
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return written; /* Error code */
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tot_written += written;
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if (tot_written == 0) {
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struct ubifs_lprops lp;
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dbg_gc("LEB %d wrote %d index nodes", lnum, tot_written);
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err = ubifs_read_one_lp(c, lnum, &lp);
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if (err)
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return err;
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if (lp.free == c->leb_size) {
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/*
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* We must have snatched this LEB from the idx_gc list
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* so we need to correct the free and dirty space.
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*/
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err = ubifs_change_one_lp(c, lnum,
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c->leb_size - c->ileb_len,
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dirt, 0, 0, 0);
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if (err)
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return err;
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}
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|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
err = ubifs_change_one_lp(c, lnum, c->leb_size - c->ileb_len, dirt,
|
|
|
|
|
0, 0, 0);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
err = ubifs_leb_change(c, lnum, c->ileb_buf, c->ileb_len,
|
|
|
|
|
UBI_SHORTTERM);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
dbg_gc("LEB %d wrote %d index nodes", lnum, tot_written);
|
|
|
|
|
return tot_written;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* get_leb_cnt - calculate the number of empty LEBs needed to commit.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
* @cnt: number of znodes to commit
|
|
|
|
|
*
|
|
|
|
|
* This function returns the number of empty LEBs needed to commit @cnt znodes
|
|
|
|
|
* to the current index head. The number is not exact and may be more than
|
|
|
|
|
* needed.
|
|
|
|
|
*/
|
|
|
|
|
static int get_leb_cnt(struct ubifs_info *c, int cnt)
|
|
|
|
|
{
|
|
|
|
|
int d;
|
|
|
|
|
|
|
|
|
|
/* Assume maximum index node size (i.e. overestimate space needed) */
|
|
|
|
|
cnt -= (c->leb_size - c->ihead_offs) / c->max_idx_node_sz;
|
|
|
|
|
if (cnt < 0)
|
|
|
|
|
cnt = 0;
|
|
|
|
|
d = c->leb_size / c->max_idx_node_sz;
|
|
|
|
|
return DIV_ROUND_UP(cnt, d);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* layout_in_gaps - in-the-gaps method of committing TNC.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
* @cnt: number of dirty znodes to commit.
|
|
|
|
|
*
|
|
|
|
|
* This function lays out new index nodes for dirty znodes using in-the-gaps
|
|
|
|
|
* method of TNC commit.
|
|
|
|
|
*
|
|
|
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
|
|
|
*/
|
|
|
|
|
static int layout_in_gaps(struct ubifs_info *c, int cnt)
|
|
|
|
|
{
|
|
|
|
|
int err, leb_needed_cnt, written, *p;
|
|
|
|
|
|
|
|
|
|
dbg_gc("%d znodes to write", cnt);
|
|
|
|
|
|
|
|
|
|
c->gap_lebs = kmalloc(sizeof(int) * (c->lst.idx_lebs + 1), GFP_NOFS);
|
|
|
|
|
if (!c->gap_lebs)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
p = c->gap_lebs;
|
|
|
|
|
do {
|
|
|
|
|
ubifs_assert(p < c->gap_lebs + sizeof(int) * c->lst.idx_lebs);
|
|
|
|
|
written = layout_leb_in_gaps(c, p);
|
|
|
|
|
if (written < 0) {
|
|
|
|
|
err = written;
|
2008-07-25 09:39:44 -04:00
|
|
|
|
if (err != -ENOSPC) {
|
|
|
|
|
kfree(c->gap_lebs);
|
|
|
|
|
c->gap_lebs = NULL;
|
|
|
|
|
return err;
|
2008-07-14 12:08:37 -04:00
|
|
|
|
}
|
2008-07-25 09:39:44 -04:00
|
|
|
|
if (!dbg_force_in_the_gaps_enabled) {
|
|
|
|
|
/*
|
|
|
|
|
* Do not print scary warnings if the debugging
|
|
|
|
|
* option which forces in-the-gaps is enabled.
|
|
|
|
|
*/
|
|
|
|
|
ubifs_err("out of space");
|
|
|
|
|
spin_lock(&c->space_lock);
|
|
|
|
|
dbg_dump_budg(c);
|
|
|
|
|
spin_unlock(&c->space_lock);
|
|
|
|
|
dbg_dump_lprops(c);
|
|
|
|
|
}
|
|
|
|
|
/* Try to commit anyway */
|
|
|
|
|
err = 0;
|
|
|
|
|
break;
|
2008-07-14 12:08:37 -04:00
|
|
|
|
}
|
|
|
|
|
p++;
|
|
|
|
|
cnt -= written;
|
|
|
|
|
leb_needed_cnt = get_leb_cnt(c, cnt);
|
|
|
|
|
dbg_gc("%d znodes remaining, need %d LEBs, have %d", cnt,
|
|
|
|
|
leb_needed_cnt, c->ileb_cnt);
|
|
|
|
|
} while (leb_needed_cnt > c->ileb_cnt);
|
|
|
|
|
|
|
|
|
|
*p = -1;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* layout_in_empty_space - layout index nodes in empty space.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* This function lays out new index nodes for dirty znodes using empty LEBs.
|
|
|
|
|
*
|
|
|
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
|
|
|
*/
|
|
|
|
|
static int layout_in_empty_space(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
struct ubifs_znode *znode, *cnext, *zp;
|
|
|
|
|
int lnum, offs, len, next_len, buf_len, buf_offs, used, avail;
|
|
|
|
|
int wlen, blen, err;
|
|
|
|
|
|
|
|
|
|
cnext = c->enext;
|
|
|
|
|
if (!cnext)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
lnum = c->ihead_lnum;
|
|
|
|
|
buf_offs = c->ihead_offs;
|
|
|
|
|
|
|
|
|
|
buf_len = ubifs_idx_node_sz(c, c->fanout);
|
|
|
|
|
buf_len = ALIGN(buf_len, c->min_io_size);
|
|
|
|
|
used = 0;
|
|
|
|
|
avail = buf_len;
|
|
|
|
|
|
|
|
|
|
/* Ensure there is enough room for first write */
|
|
|
|
|
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
|
|
|
|
|
if (buf_offs + next_len > c->leb_size)
|
|
|
|
|
lnum = -1;
|
|
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
|
znode = cnext;
|
|
|
|
|
|
|
|
|
|
len = ubifs_idx_node_sz(c, znode->child_cnt);
|
|
|
|
|
|
|
|
|
|
/* Determine the index node position */
|
|
|
|
|
if (lnum == -1) {
|
|
|
|
|
if (c->ileb_nxt >= c->ileb_cnt) {
|
|
|
|
|
ubifs_err("out of space");
|
|
|
|
|
return -ENOSPC;
|
|
|
|
|
}
|
|
|
|
|
lnum = c->ilebs[c->ileb_nxt++];
|
|
|
|
|
buf_offs = 0;
|
|
|
|
|
used = 0;
|
|
|
|
|
avail = buf_len;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
offs = buf_offs + used;
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_UBIFS_FS_DEBUG
|
|
|
|
|
znode->lnum = lnum;
|
|
|
|
|
znode->offs = offs;
|
|
|
|
|
znode->len = len;
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* Update the parent */
|
|
|
|
|
zp = znode->parent;
|
|
|
|
|
if (zp) {
|
|
|
|
|
struct ubifs_zbranch *zbr;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
i = znode->iip;
|
|
|
|
|
zbr = &zp->zbranch[i];
|
|
|
|
|
zbr->lnum = lnum;
|
|
|
|
|
zbr->offs = offs;
|
|
|
|
|
zbr->len = len;
|
|
|
|
|
} else {
|
|
|
|
|
c->zroot.lnum = lnum;
|
|
|
|
|
c->zroot.offs = offs;
|
|
|
|
|
c->zroot.len = len;
|
|
|
|
|
}
|
|
|
|
|
c->calc_idx_sz += ALIGN(len, 8);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Once lprops is updated, we can decrease the dirty znode count
|
|
|
|
|
* but it is easier to just do it here.
|
|
|
|
|
*/
|
|
|
|
|
atomic_long_dec(&c->dirty_zn_cnt);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Calculate the next index node length to see if there is
|
|
|
|
|
* enough room for it
|
|
|
|
|
*/
|
|
|
|
|
cnext = znode->cnext;
|
|
|
|
|
if (cnext == c->cnext)
|
|
|
|
|
next_len = 0;
|
|
|
|
|
else
|
|
|
|
|
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
|
|
|
|
|
|
|
|
|
|
if (c->min_io_size == 1) {
|
|
|
|
|
buf_offs += ALIGN(len, 8);
|
|
|
|
|
if (next_len) {
|
|
|
|
|
if (buf_offs + next_len <= c->leb_size)
|
|
|
|
|
continue;
|
|
|
|
|
err = ubifs_update_one_lp(c, lnum, 0,
|
|
|
|
|
c->leb_size - buf_offs, 0, 0);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
lnum = -1;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
err = ubifs_update_one_lp(c, lnum,
|
|
|
|
|
c->leb_size - buf_offs, 0, 0, 0);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Update buffer positions */
|
|
|
|
|
wlen = used + len;
|
|
|
|
|
used += ALIGN(len, 8);
|
|
|
|
|
avail -= ALIGN(len, 8);
|
|
|
|
|
|
|
|
|
|
if (next_len != 0 &&
|
|
|
|
|
buf_offs + used + next_len <= c->leb_size &&
|
|
|
|
|
avail > 0)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
if (avail <= 0 && next_len &&
|
|
|
|
|
buf_offs + used + next_len <= c->leb_size)
|
|
|
|
|
blen = buf_len;
|
|
|
|
|
else
|
|
|
|
|
blen = ALIGN(wlen, c->min_io_size);
|
|
|
|
|
|
|
|
|
|
/* The buffer is full or there are no more znodes to do */
|
|
|
|
|
buf_offs += blen;
|
|
|
|
|
if (next_len) {
|
|
|
|
|
if (buf_offs + next_len > c->leb_size) {
|
|
|
|
|
err = ubifs_update_one_lp(c, lnum,
|
|
|
|
|
c->leb_size - buf_offs, blen - used,
|
|
|
|
|
0, 0);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
lnum = -1;
|
|
|
|
|
}
|
|
|
|
|
used -= blen;
|
|
|
|
|
if (used < 0)
|
|
|
|
|
used = 0;
|
|
|
|
|
avail = buf_len - used;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
err = ubifs_update_one_lp(c, lnum, c->leb_size - buf_offs,
|
|
|
|
|
blen - used, 0, 0);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_UBIFS_FS_DEBUG
|
2008-10-17 06:31:39 -04:00
|
|
|
|
c->dbg->new_ihead_lnum = lnum;
|
|
|
|
|
c->dbg->new_ihead_offs = buf_offs;
|
2008-07-14 12:08:37 -04:00
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* layout_commit - determine positions of index nodes to commit.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
* @no_space: indicates that insufficient empty LEBs were allocated
|
|
|
|
|
* @cnt: number of znodes to commit
|
|
|
|
|
*
|
|
|
|
|
* Calculate and update the positions of index nodes to commit. If there were
|
|
|
|
|
* an insufficient number of empty LEBs allocated, then index nodes are placed
|
|
|
|
|
* into the gaps created by obsolete index nodes in non-empty index LEBs. For
|
|
|
|
|
* this purpose, an obsolete index node is one that was not in the index as at
|
|
|
|
|
* the end of the last commit. To write "in-the-gaps" requires that those index
|
|
|
|
|
* LEBs are updated atomically in-place.
|
|
|
|
|
*/
|
|
|
|
|
static int layout_commit(struct ubifs_info *c, int no_space, int cnt)
|
|
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
if (no_space) {
|
|
|
|
|
err = layout_in_gaps(c, cnt);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
err = layout_in_empty_space(c);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* find_first_dirty - find first dirty znode.
|
|
|
|
|
* @znode: znode to begin searching from
|
|
|
|
|
*/
|
|
|
|
|
static struct ubifs_znode *find_first_dirty(struct ubifs_znode *znode)
|
|
|
|
|
{
|
|
|
|
|
int i, cont;
|
|
|
|
|
|
|
|
|
|
if (!znode)
|
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
|
if (znode->level == 0) {
|
|
|
|
|
if (ubifs_zn_dirty(znode))
|
|
|
|
|
return znode;
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
cont = 0;
|
|
|
|
|
for (i = 0; i < znode->child_cnt; i++) {
|
|
|
|
|
struct ubifs_zbranch *zbr = &znode->zbranch[i];
|
|
|
|
|
|
|
|
|
|
if (zbr->znode && ubifs_zn_dirty(zbr->znode)) {
|
|
|
|
|
znode = zbr->znode;
|
|
|
|
|
cont = 1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if (!cont) {
|
|
|
|
|
if (ubifs_zn_dirty(znode))
|
|
|
|
|
return znode;
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* find_next_dirty - find next dirty znode.
|
|
|
|
|
* @znode: znode to begin searching from
|
|
|
|
|
*/
|
|
|
|
|
static struct ubifs_znode *find_next_dirty(struct ubifs_znode *znode)
|
|
|
|
|
{
|
|
|
|
|
int n = znode->iip + 1;
|
|
|
|
|
|
|
|
|
|
znode = znode->parent;
|
|
|
|
|
if (!znode)
|
|
|
|
|
return NULL;
|
|
|
|
|
for (; n < znode->child_cnt; n++) {
|
|
|
|
|
struct ubifs_zbranch *zbr = &znode->zbranch[n];
|
|
|
|
|
|
|
|
|
|
if (zbr->znode && ubifs_zn_dirty(zbr->znode))
|
|
|
|
|
return find_first_dirty(zbr->znode);
|
|
|
|
|
}
|
|
|
|
|
return znode;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* get_znodes_to_commit - create list of dirty znodes to commit.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* This function returns the number of znodes to commit.
|
|
|
|
|
*/
|
|
|
|
|
static int get_znodes_to_commit(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
struct ubifs_znode *znode, *cnext;
|
|
|
|
|
int cnt = 0;
|
|
|
|
|
|
|
|
|
|
c->cnext = find_first_dirty(c->zroot.znode);
|
|
|
|
|
znode = c->enext = c->cnext;
|
|
|
|
|
if (!znode) {
|
|
|
|
|
dbg_cmt("no znodes to commit");
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
cnt += 1;
|
|
|
|
|
while (1) {
|
|
|
|
|
ubifs_assert(!test_bit(COW_ZNODE, &znode->flags));
|
|
|
|
|
__set_bit(COW_ZNODE, &znode->flags);
|
|
|
|
|
znode->alt = 0;
|
|
|
|
|
cnext = find_next_dirty(znode);
|
|
|
|
|
if (!cnext) {
|
|
|
|
|
znode->cnext = c->cnext;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
znode->cnext = cnext;
|
|
|
|
|
znode = cnext;
|
|
|
|
|
cnt += 1;
|
|
|
|
|
}
|
|
|
|
|
dbg_cmt("committing %d znodes", cnt);
|
|
|
|
|
ubifs_assert(cnt == atomic_long_read(&c->dirty_zn_cnt));
|
|
|
|
|
return cnt;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* alloc_idx_lebs - allocate empty LEBs to be used to commit.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
* @cnt: number of znodes to commit
|
|
|
|
|
*
|
|
|
|
|
* This function returns %-ENOSPC if it cannot allocate a sufficient number of
|
|
|
|
|
* empty LEBs. %0 is returned on success, otherwise a negative error code
|
|
|
|
|
* is returned.
|
|
|
|
|
*/
|
|
|
|
|
static int alloc_idx_lebs(struct ubifs_info *c, int cnt)
|
|
|
|
|
{
|
|
|
|
|
int i, leb_cnt, lnum;
|
|
|
|
|
|
|
|
|
|
c->ileb_cnt = 0;
|
|
|
|
|
c->ileb_nxt = 0;
|
|
|
|
|
leb_cnt = get_leb_cnt(c, cnt);
|
|
|
|
|
dbg_cmt("need about %d empty LEBS for TNC commit", leb_cnt);
|
|
|
|
|
if (!leb_cnt)
|
|
|
|
|
return 0;
|
|
|
|
|
c->ilebs = kmalloc(leb_cnt * sizeof(int), GFP_NOFS);
|
|
|
|
|
if (!c->ilebs)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
for (i = 0; i < leb_cnt; i++) {
|
|
|
|
|
lnum = ubifs_find_free_leb_for_idx(c);
|
|
|
|
|
if (lnum < 0)
|
|
|
|
|
return lnum;
|
|
|
|
|
c->ilebs[c->ileb_cnt++] = lnum;
|
|
|
|
|
dbg_cmt("LEB %d", lnum);
|
|
|
|
|
}
|
|
|
|
|
if (dbg_force_in_the_gaps())
|
|
|
|
|
return -ENOSPC;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* free_unused_idx_lebs - free unused LEBs that were allocated for the commit.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* It is possible that we allocate more empty LEBs for the commit than we need.
|
|
|
|
|
* This functions frees the surplus.
|
|
|
|
|
*
|
|
|
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
|
|
|
*/
|
|
|
|
|
static int free_unused_idx_lebs(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
int i, err = 0, lnum, er;
|
|
|
|
|
|
|
|
|
|
for (i = c->ileb_nxt; i < c->ileb_cnt; i++) {
|
|
|
|
|
lnum = c->ilebs[i];
|
|
|
|
|
dbg_cmt("LEB %d", lnum);
|
|
|
|
|
er = ubifs_change_one_lp(c, lnum, LPROPS_NC, LPROPS_NC, 0,
|
|
|
|
|
LPROPS_INDEX | LPROPS_TAKEN, 0);
|
|
|
|
|
if (!err)
|
|
|
|
|
err = er;
|
|
|
|
|
}
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* free_idx_lebs - free unused LEBs after commit end.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
|
|
|
*/
|
|
|
|
|
static int free_idx_lebs(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
err = free_unused_idx_lebs(c);
|
|
|
|
|
kfree(c->ilebs);
|
|
|
|
|
c->ilebs = NULL;
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* ubifs_tnc_start_commit - start TNC commit.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
* @zroot: new index root position is returned here
|
|
|
|
|
*
|
|
|
|
|
* This function prepares the list of indexing nodes to commit and lays out
|
|
|
|
|
* their positions on flash. If there is not enough free space it uses the
|
|
|
|
|
* in-gap commit method. Returns zero in case of success and a negative error
|
|
|
|
|
* code in case of failure.
|
|
|
|
|
*/
|
|
|
|
|
int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot)
|
|
|
|
|
{
|
|
|
|
|
int err = 0, cnt;
|
|
|
|
|
|
|
|
|
|
mutex_lock(&c->tnc_mutex);
|
|
|
|
|
err = dbg_check_tnc(c, 1);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out;
|
|
|
|
|
cnt = get_znodes_to_commit(c);
|
|
|
|
|
if (cnt != 0) {
|
|
|
|
|
int no_space = 0;
|
|
|
|
|
|
|
|
|
|
err = alloc_idx_lebs(c, cnt);
|
|
|
|
|
if (err == -ENOSPC)
|
|
|
|
|
no_space = 1;
|
|
|
|
|
else if (err)
|
|
|
|
|
goto out_free;
|
|
|
|
|
err = layout_commit(c, no_space, cnt);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out_free;
|
|
|
|
|
ubifs_assert(atomic_long_read(&c->dirty_zn_cnt) == 0);
|
|
|
|
|
err = free_unused_idx_lebs(c);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out;
|
|
|
|
|
}
|
|
|
|
|
destroy_old_idx(c);
|
|
|
|
|
memcpy(zroot, &c->zroot, sizeof(struct ubifs_zbranch));
|
|
|
|
|
|
|
|
|
|
err = ubifs_save_dirty_idx_lnums(c);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
|
|
spin_lock(&c->space_lock);
|
|
|
|
|
/*
|
|
|
|
|
* Although we have not finished committing yet, update size of the
|
|
|
|
|
* committed index ('c->old_idx_sz') and zero out the index growth
|
|
|
|
|
* budget. It is OK to do this now, because we've reserved all the
|
|
|
|
|
* space which is needed to commit the index, and it is save for the
|
|
|
|
|
* budgeting subsystem to assume the index is already committed,
|
|
|
|
|
* even though it is not.
|
|
|
|
|
*/
|
2008-12-22 04:09:04 -05:00
|
|
|
|
ubifs_assert(c->min_idx_lebs == ubifs_calc_min_idx_lebs(c));
|
2008-07-14 12:08:37 -04:00
|
|
|
|
c->old_idx_sz = c->calc_idx_sz;
|
|
|
|
|
c->budg_uncommitted_idx = 0;
|
2008-12-22 04:09:04 -05:00
|
|
|
|
c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
|
2008-07-14 12:08:37 -04:00
|
|
|
|
spin_unlock(&c->space_lock);
|
|
|
|
|
mutex_unlock(&c->tnc_mutex);
|
|
|
|
|
|
|
|
|
|
dbg_cmt("number of index LEBs %d", c->lst.idx_lebs);
|
|
|
|
|
dbg_cmt("size of index %llu", c->calc_idx_sz);
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
|
|
out_free:
|
|
|
|
|
free_idx_lebs(c);
|
|
|
|
|
out:
|
|
|
|
|
mutex_unlock(&c->tnc_mutex);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* write_index - write index nodes.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* This function writes the index nodes whose positions were laid out in the
|
|
|
|
|
* layout_in_empty_space function.
|
|
|
|
|
*/
|
|
|
|
|
static int write_index(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
struct ubifs_idx_node *idx;
|
|
|
|
|
struct ubifs_znode *znode, *cnext;
|
|
|
|
|
int i, lnum, offs, len, next_len, buf_len, buf_offs, used;
|
|
|
|
|
int avail, wlen, err, lnum_pos = 0;
|
|
|
|
|
|
|
|
|
|
cnext = c->enext;
|
|
|
|
|
if (!cnext)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Always write index nodes to the index head so that index nodes and
|
|
|
|
|
* other types of nodes are never mixed in the same erase block.
|
|
|
|
|
*/
|
|
|
|
|
lnum = c->ihead_lnum;
|
|
|
|
|
buf_offs = c->ihead_offs;
|
|
|
|
|
|
|
|
|
|
/* Allocate commit buffer */
|
|
|
|
|
buf_len = ALIGN(c->max_idx_node_sz, c->min_io_size);
|
|
|
|
|
used = 0;
|
|
|
|
|
avail = buf_len;
|
|
|
|
|
|
|
|
|
|
/* Ensure there is enough room for first write */
|
|
|
|
|
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
|
|
|
|
|
if (buf_offs + next_len > c->leb_size) {
|
|
|
|
|
err = ubifs_update_one_lp(c, lnum, LPROPS_NC, 0, 0,
|
|
|
|
|
LPROPS_TAKEN);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
lnum = -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
|
cond_resched();
|
|
|
|
|
|
|
|
|
|
znode = cnext;
|
|
|
|
|
idx = c->cbuf + used;
|
|
|
|
|
|
|
|
|
|
/* Make index node */
|
|
|
|
|
idx->ch.node_type = UBIFS_IDX_NODE;
|
|
|
|
|
idx->child_cnt = cpu_to_le16(znode->child_cnt);
|
|
|
|
|
idx->level = cpu_to_le16(znode->level);
|
|
|
|
|
for (i = 0; i < znode->child_cnt; i++) {
|
|
|
|
|
struct ubifs_branch *br = ubifs_idx_branch(c, idx, i);
|
|
|
|
|
struct ubifs_zbranch *zbr = &znode->zbranch[i];
|
|
|
|
|
|
|
|
|
|
key_write_idx(c, &zbr->key, &br->key);
|
|
|
|
|
br->lnum = cpu_to_le32(zbr->lnum);
|
|
|
|
|
br->offs = cpu_to_le32(zbr->offs);
|
|
|
|
|
br->len = cpu_to_le32(zbr->len);
|
|
|
|
|
if (!zbr->lnum || !zbr->len) {
|
|
|
|
|
ubifs_err("bad ref in znode");
|
|
|
|
|
dbg_dump_znode(c, znode);
|
|
|
|
|
if (zbr->znode)
|
|
|
|
|
dbg_dump_znode(c, zbr->znode);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
len = ubifs_idx_node_sz(c, znode->child_cnt);
|
|
|
|
|
ubifs_prepare_node(c, idx, len, 0);
|
|
|
|
|
|
|
|
|
|
/* Determine the index node position */
|
|
|
|
|
if (lnum == -1) {
|
|
|
|
|
lnum = c->ilebs[lnum_pos++];
|
|
|
|
|
buf_offs = 0;
|
|
|
|
|
used = 0;
|
|
|
|
|
avail = buf_len;
|
|
|
|
|
}
|
|
|
|
|
offs = buf_offs + used;
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_UBIFS_FS_DEBUG
|
|
|
|
|
if (lnum != znode->lnum || offs != znode->offs ||
|
|
|
|
|
len != znode->len) {
|
|
|
|
|
ubifs_err("inconsistent znode posn");
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* Grab some stuff from znode while we still can */
|
|
|
|
|
cnext = znode->cnext;
|
|
|
|
|
|
|
|
|
|
ubifs_assert(ubifs_zn_dirty(znode));
|
|
|
|
|
ubifs_assert(test_bit(COW_ZNODE, &znode->flags));
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* It is important that other threads should see %DIRTY_ZNODE
|
|
|
|
|
* flag cleared before %COW_ZNODE. Specifically, it matters in
|
|
|
|
|
* the 'dirty_cow_znode()' function. This is the reason for the
|
|
|
|
|
* first barrier. Also, we want the bit changes to be seen to
|
|
|
|
|
* other threads ASAP, to avoid unnecesarry copying, which is
|
|
|
|
|
* the reason for the second barrier.
|
|
|
|
|
*/
|
|
|
|
|
clear_bit(DIRTY_ZNODE, &znode->flags);
|
|
|
|
|
smp_mb__before_clear_bit();
|
|
|
|
|
clear_bit(COW_ZNODE, &znode->flags);
|
|
|
|
|
smp_mb__after_clear_bit();
|
|
|
|
|
|
|
|
|
|
/* Do not access znode from this point on */
|
|
|
|
|
|
|
|
|
|
/* Update buffer positions */
|
|
|
|
|
wlen = used + len;
|
|
|
|
|
used += ALIGN(len, 8);
|
|
|
|
|
avail -= ALIGN(len, 8);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Calculate the next index node length to see if there is
|
|
|
|
|
* enough room for it
|
|
|
|
|
*/
|
|
|
|
|
if (cnext == c->cnext)
|
|
|
|
|
next_len = 0;
|
|
|
|
|
else
|
|
|
|
|
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
|
|
|
|
|
|
|
|
|
|
if (c->min_io_size == 1) {
|
|
|
|
|
/*
|
|
|
|
|
* Write the prepared index node immediately if there is
|
|
|
|
|
* no minimum IO size
|
|
|
|
|
*/
|
|
|
|
|
err = ubifs_leb_write(c, lnum, c->cbuf, buf_offs,
|
|
|
|
|
wlen, UBI_SHORTTERM);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
buf_offs += ALIGN(wlen, 8);
|
|
|
|
|
if (next_len) {
|
|
|
|
|
used = 0;
|
|
|
|
|
avail = buf_len;
|
|
|
|
|
if (buf_offs + next_len > c->leb_size) {
|
|
|
|
|
err = ubifs_update_one_lp(c, lnum,
|
|
|
|
|
LPROPS_NC, 0, 0, LPROPS_TAKEN);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
lnum = -1;
|
|
|
|
|
}
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
int blen, nxt_offs = buf_offs + used + next_len;
|
|
|
|
|
|
|
|
|
|
if (next_len && nxt_offs <= c->leb_size) {
|
|
|
|
|
if (avail > 0)
|
|
|
|
|
continue;
|
|
|
|
|
else
|
|
|
|
|
blen = buf_len;
|
|
|
|
|
} else {
|
|
|
|
|
wlen = ALIGN(wlen, 8);
|
|
|
|
|
blen = ALIGN(wlen, c->min_io_size);
|
|
|
|
|
ubifs_pad(c, c->cbuf + wlen, blen - wlen);
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* The buffer is full or there are no more znodes
|
|
|
|
|
* to do
|
|
|
|
|
*/
|
|
|
|
|
err = ubifs_leb_write(c, lnum, c->cbuf, buf_offs,
|
|
|
|
|
blen, UBI_SHORTTERM);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
buf_offs += blen;
|
|
|
|
|
if (next_len) {
|
|
|
|
|
if (nxt_offs > c->leb_size) {
|
|
|
|
|
err = ubifs_update_one_lp(c, lnum,
|
|
|
|
|
LPROPS_NC, 0, 0, LPROPS_TAKEN);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
lnum = -1;
|
|
|
|
|
}
|
|
|
|
|
used -= blen;
|
|
|
|
|
if (used < 0)
|
|
|
|
|
used = 0;
|
|
|
|
|
avail = buf_len - used;
|
|
|
|
|
memmove(c->cbuf, c->cbuf + blen, used);
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_UBIFS_FS_DEBUG
|
2008-10-17 06:31:39 -04:00
|
|
|
|
if (lnum != c->dbg->new_ihead_lnum ||
|
|
|
|
|
buf_offs != c->dbg->new_ihead_offs) {
|
2008-07-14 12:08:37 -04:00
|
|
|
|
ubifs_err("inconsistent ihead");
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
c->ihead_lnum = lnum;
|
|
|
|
|
c->ihead_offs = buf_offs;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* free_obsolete_znodes - free obsolete znodes.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* At the end of commit end, obsolete znodes are freed.
|
|
|
|
|
*/
|
|
|
|
|
static void free_obsolete_znodes(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
struct ubifs_znode *znode, *cnext;
|
|
|
|
|
|
|
|
|
|
cnext = c->cnext;
|
|
|
|
|
do {
|
|
|
|
|
znode = cnext;
|
|
|
|
|
cnext = znode->cnext;
|
|
|
|
|
if (test_bit(OBSOLETE_ZNODE, &znode->flags))
|
|
|
|
|
kfree(znode);
|
|
|
|
|
else {
|
|
|
|
|
znode->cnext = NULL;
|
|
|
|
|
atomic_long_inc(&c->clean_zn_cnt);
|
|
|
|
|
atomic_long_inc(&ubifs_clean_zn_cnt);
|
|
|
|
|
}
|
|
|
|
|
} while (cnext != c->cnext);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* return_gap_lebs - return LEBs used by the in-gap commit method.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* This function clears the "taken" flag for the LEBs which were used by the
|
|
|
|
|
* "commit in-the-gaps" method.
|
|
|
|
|
*/
|
|
|
|
|
static int return_gap_lebs(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
int *p, err;
|
|
|
|
|
|
|
|
|
|
if (!c->gap_lebs)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
dbg_cmt("");
|
|
|
|
|
for (p = c->gap_lebs; *p != -1; p++) {
|
|
|
|
|
err = ubifs_change_one_lp(c, *p, LPROPS_NC, LPROPS_NC, 0,
|
|
|
|
|
LPROPS_TAKEN, 0);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
kfree(c->gap_lebs);
|
|
|
|
|
c->gap_lebs = NULL;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* ubifs_tnc_end_commit - update the TNC for commit end.
|
|
|
|
|
* @c: UBIFS file-system description object
|
|
|
|
|
*
|
|
|
|
|
* Write the dirty znodes.
|
|
|
|
|
*/
|
|
|
|
|
int ubifs_tnc_end_commit(struct ubifs_info *c)
|
|
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
if (!c->cnext)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
err = return_gap_lebs(c);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
|
|
err = write_index(c);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
|
|
mutex_lock(&c->tnc_mutex);
|
|
|
|
|
|
|
|
|
|
dbg_cmt("TNC height is %d", c->zroot.znode->level + 1);
|
|
|
|
|
|
|
|
|
|
free_obsolete_znodes(c);
|
|
|
|
|
|
|
|
|
|
c->cnext = NULL;
|
|
|
|
|
kfree(c->ilebs);
|
|
|
|
|
c->ilebs = NULL;
|
|
|
|
|
|
|
|
|
|
mutex_unlock(&c->tnc_mutex);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|