mirror of https://gitee.com/openkylin/linux.git
678 lines
18 KiB
C
678 lines
18 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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* 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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/*
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* This file implements functions that manage the running of the commit process.
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* Each affected module has its own functions to accomplish their part in the
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* commit and those functions are called here.
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*
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* The commit is the process whereby all updates to the index and LEB properties
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* are written out together and the journal becomes empty. This keeps the
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* file system consistent - at all times the state can be recreated by reading
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* the index and LEB properties and then replaying the journal.
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*
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* The commit is split into two parts named "commit start" and "commit end".
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* During commit start, the commit process has exclusive access to the journal
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* by holding the commit semaphore down for writing. As few I/O operations as
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* possible are performed during commit start, instead the nodes that are to be
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* written are merely identified. During commit end, the commit semaphore is no
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* longer held and the journal is again in operation, allowing users to continue
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* to use the file system while the bulk of the commit I/O is performed. The
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* purpose of this two-step approach is to prevent the commit from causing any
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* latency blips. Note that in any case, the commit does not prevent lookups
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* (as permitted by the TNC mutex), or access to VFS data structures e.g. page
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* cache.
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*/
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include "ubifs.h"
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/**
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* do_commit - commit the journal.
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* @c: UBIFS file-system description object
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*
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* This function implements UBIFS commit. It has to be called with commit lock
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* locked. 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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static int do_commit(struct ubifs_info *c)
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{
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int err, new_ltail_lnum, old_ltail_lnum, i;
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struct ubifs_zbranch zroot;
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struct ubifs_lp_stats lst;
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dbg_cmt("start");
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if (c->ro_media) {
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err = -EROFS;
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goto out_up;
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}
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/* Sync all write buffers (necessary for recovery) */
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for (i = 0; i < c->jhead_cnt; i++) {
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err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
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if (err)
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goto out_up;
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}
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err = ubifs_gc_start_commit(c);
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if (err)
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goto out_up;
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err = dbg_check_lprops(c);
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if (err)
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goto out_up;
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err = ubifs_log_start_commit(c, &new_ltail_lnum);
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if (err)
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goto out_up;
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err = ubifs_tnc_start_commit(c, &zroot);
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if (err)
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goto out_up;
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err = ubifs_lpt_start_commit(c);
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if (err)
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goto out_up;
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err = ubifs_orphan_start_commit(c);
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if (err)
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goto out_up;
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ubifs_get_lp_stats(c, &lst);
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up_write(&c->commit_sem);
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err = ubifs_tnc_end_commit(c);
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if (err)
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goto out;
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err = ubifs_lpt_end_commit(c);
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if (err)
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goto out;
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err = ubifs_orphan_end_commit(c);
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if (err)
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goto out;
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old_ltail_lnum = c->ltail_lnum;
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err = ubifs_log_end_commit(c, new_ltail_lnum);
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if (err)
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goto out;
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err = dbg_check_old_index(c, &zroot);
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if (err)
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goto out;
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mutex_lock(&c->mst_mutex);
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c->mst_node->cmt_no = cpu_to_le64(++c->cmt_no);
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c->mst_node->log_lnum = cpu_to_le32(new_ltail_lnum);
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c->mst_node->root_lnum = cpu_to_le32(zroot.lnum);
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c->mst_node->root_offs = cpu_to_le32(zroot.offs);
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c->mst_node->root_len = cpu_to_le32(zroot.len);
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c->mst_node->ihead_lnum = cpu_to_le32(c->ihead_lnum);
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c->mst_node->ihead_offs = cpu_to_le32(c->ihead_offs);
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c->mst_node->index_size = cpu_to_le64(c->old_idx_sz);
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c->mst_node->lpt_lnum = cpu_to_le32(c->lpt_lnum);
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c->mst_node->lpt_offs = cpu_to_le32(c->lpt_offs);
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c->mst_node->nhead_lnum = cpu_to_le32(c->nhead_lnum);
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c->mst_node->nhead_offs = cpu_to_le32(c->nhead_offs);
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c->mst_node->ltab_lnum = cpu_to_le32(c->ltab_lnum);
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c->mst_node->ltab_offs = cpu_to_le32(c->ltab_offs);
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c->mst_node->lsave_lnum = cpu_to_le32(c->lsave_lnum);
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c->mst_node->lsave_offs = cpu_to_le32(c->lsave_offs);
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c->mst_node->lscan_lnum = cpu_to_le32(c->lscan_lnum);
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c->mst_node->empty_lebs = cpu_to_le32(lst.empty_lebs);
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c->mst_node->idx_lebs = cpu_to_le32(lst.idx_lebs);
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c->mst_node->total_free = cpu_to_le64(lst.total_free);
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c->mst_node->total_dirty = cpu_to_le64(lst.total_dirty);
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c->mst_node->total_used = cpu_to_le64(lst.total_used);
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c->mst_node->total_dead = cpu_to_le64(lst.total_dead);
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c->mst_node->total_dark = cpu_to_le64(lst.total_dark);
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if (c->no_orphs)
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c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
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else
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c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_NO_ORPHS);
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err = ubifs_write_master(c);
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mutex_unlock(&c->mst_mutex);
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if (err)
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goto out;
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err = ubifs_log_post_commit(c, old_ltail_lnum);
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if (err)
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goto out;
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err = ubifs_gc_end_commit(c);
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if (err)
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goto out;
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err = ubifs_lpt_post_commit(c);
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if (err)
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goto out;
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spin_lock(&c->cs_lock);
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c->cmt_state = COMMIT_RESTING;
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wake_up(&c->cmt_wq);
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dbg_cmt("commit end");
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spin_unlock(&c->cs_lock);
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return 0;
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out_up:
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up_write(&c->commit_sem);
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out:
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ubifs_err("commit failed, error %d", err);
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spin_lock(&c->cs_lock);
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c->cmt_state = COMMIT_BROKEN;
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wake_up(&c->cmt_wq);
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spin_unlock(&c->cs_lock);
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ubifs_ro_mode(c, err);
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return err;
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}
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/**
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* run_bg_commit - run background commit if it is needed.
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* @c: UBIFS file-system description object
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*
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* This function runs background commit if it is needed. Returns zero in case
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* of success and a negative error code in case of failure.
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*/
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static int run_bg_commit(struct ubifs_info *c)
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{
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spin_lock(&c->cs_lock);
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/*
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* Run background commit only if background commit was requested or if
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* commit is required.
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*/
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if (c->cmt_state != COMMIT_BACKGROUND &&
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c->cmt_state != COMMIT_REQUIRED)
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goto out;
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spin_unlock(&c->cs_lock);
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down_write(&c->commit_sem);
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spin_lock(&c->cs_lock);
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if (c->cmt_state == COMMIT_REQUIRED)
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c->cmt_state = COMMIT_RUNNING_REQUIRED;
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else if (c->cmt_state == COMMIT_BACKGROUND)
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c->cmt_state = COMMIT_RUNNING_BACKGROUND;
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else
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goto out_cmt_unlock;
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spin_unlock(&c->cs_lock);
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return do_commit(c);
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out_cmt_unlock:
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up_write(&c->commit_sem);
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out:
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spin_unlock(&c->cs_lock);
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return 0;
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}
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/**
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* ubifs_bg_thread - UBIFS background thread function.
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* @info: points to the file-system description object
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*
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* This function implements various file-system background activities:
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* o when a write-buffer timer expires it synchronizes the appropriate
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* write-buffer;
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* o when the journal is about to be full, it starts in-advance commit.
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*
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* Note, other stuff like background garbage collection may be added here in
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* future.
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*/
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int ubifs_bg_thread(void *info)
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{
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int err;
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struct ubifs_info *c = info;
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ubifs_msg("background thread \"%s\" started, PID %d",
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c->bgt_name, current->pid);
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set_freezable();
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while (1) {
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if (kthread_should_stop())
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break;
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if (try_to_freeze())
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continue;
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set_current_state(TASK_INTERRUPTIBLE);
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/* Check if there is something to do */
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if (!c->need_bgt) {
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/*
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* Nothing prevents us from going sleep now and
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* be never woken up and block the task which
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* could wait in 'kthread_stop()' forever.
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*/
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if (kthread_should_stop())
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break;
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schedule();
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continue;
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} else
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__set_current_state(TASK_RUNNING);
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c->need_bgt = 0;
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err = ubifs_bg_wbufs_sync(c);
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if (err)
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ubifs_ro_mode(c, err);
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run_bg_commit(c);
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cond_resched();
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}
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dbg_msg("background thread \"%s\" stops", c->bgt_name);
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return 0;
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}
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/**
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* ubifs_commit_required - set commit state to "required".
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* @c: UBIFS file-system description object
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*
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* This function is called if a commit is required but cannot be done from the
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* calling function, so it is just flagged instead.
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*/
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void ubifs_commit_required(struct ubifs_info *c)
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{
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spin_lock(&c->cs_lock);
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switch (c->cmt_state) {
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case COMMIT_RESTING:
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case COMMIT_BACKGROUND:
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dbg_cmt("old: %s, new: %s", dbg_cstate(c->cmt_state),
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dbg_cstate(COMMIT_REQUIRED));
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c->cmt_state = COMMIT_REQUIRED;
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break;
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case COMMIT_RUNNING_BACKGROUND:
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dbg_cmt("old: %s, new: %s", dbg_cstate(c->cmt_state),
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dbg_cstate(COMMIT_RUNNING_REQUIRED));
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c->cmt_state = COMMIT_RUNNING_REQUIRED;
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break;
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case COMMIT_REQUIRED:
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case COMMIT_RUNNING_REQUIRED:
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case COMMIT_BROKEN:
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break;
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}
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spin_unlock(&c->cs_lock);
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}
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/**
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* ubifs_request_bg_commit - notify the background thread to do a commit.
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* @c: UBIFS file-system description object
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*
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* This function is called if the journal is full enough to make a commit
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* worthwhile, so background thread is kicked to start it.
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*/
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void ubifs_request_bg_commit(struct ubifs_info *c)
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{
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spin_lock(&c->cs_lock);
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if (c->cmt_state == COMMIT_RESTING) {
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dbg_cmt("old: %s, new: %s", dbg_cstate(c->cmt_state),
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dbg_cstate(COMMIT_BACKGROUND));
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c->cmt_state = COMMIT_BACKGROUND;
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spin_unlock(&c->cs_lock);
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ubifs_wake_up_bgt(c);
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} else
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spin_unlock(&c->cs_lock);
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}
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/**
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* wait_for_commit - wait for commit.
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* @c: UBIFS file-system description object
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*
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* This function sleeps until the commit operation is no longer running.
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*/
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static int wait_for_commit(struct ubifs_info *c)
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{
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dbg_cmt("pid %d goes sleep", current->pid);
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/*
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* The following sleeps if the condition is false, and will be woken
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* when the commit ends. It is possible, although very unlikely, that we
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* will wake up and see the subsequent commit running, rather than the
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* one we were waiting for, and go back to sleep. However, we will be
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* woken again, so there is no danger of sleeping forever.
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*/
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wait_event(c->cmt_wq, c->cmt_state != COMMIT_RUNNING_BACKGROUND &&
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c->cmt_state != COMMIT_RUNNING_REQUIRED);
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dbg_cmt("commit finished, pid %d woke up", current->pid);
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return 0;
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}
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/**
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* ubifs_run_commit - run or wait for commit.
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* @c: UBIFS file-system description object
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*
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* This function runs commit and returns zero in case of success and a negative
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* error code in case of failure.
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*/
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int ubifs_run_commit(struct ubifs_info *c)
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{
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int err = 0;
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spin_lock(&c->cs_lock);
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if (c->cmt_state == COMMIT_BROKEN) {
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err = -EINVAL;
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goto out;
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}
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if (c->cmt_state == COMMIT_RUNNING_BACKGROUND)
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/*
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* We set the commit state to 'running required' to indicate
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* that we want it to complete as quickly as possible.
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*/
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c->cmt_state = COMMIT_RUNNING_REQUIRED;
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if (c->cmt_state == COMMIT_RUNNING_REQUIRED) {
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spin_unlock(&c->cs_lock);
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return wait_for_commit(c);
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}
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spin_unlock(&c->cs_lock);
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/* Ok, the commit is indeed needed */
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down_write(&c->commit_sem);
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spin_lock(&c->cs_lock);
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/*
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* Since we unlocked 'c->cs_lock', the state may have changed, so
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* re-check it.
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*/
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if (c->cmt_state == COMMIT_BROKEN) {
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err = -EINVAL;
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goto out_cmt_unlock;
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}
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if (c->cmt_state == COMMIT_RUNNING_BACKGROUND)
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c->cmt_state = COMMIT_RUNNING_REQUIRED;
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if (c->cmt_state == COMMIT_RUNNING_REQUIRED) {
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up_write(&c->commit_sem);
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spin_unlock(&c->cs_lock);
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return wait_for_commit(c);
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}
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c->cmt_state = COMMIT_RUNNING_REQUIRED;
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spin_unlock(&c->cs_lock);
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err = do_commit(c);
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return err;
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out_cmt_unlock:
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up_write(&c->commit_sem);
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out:
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spin_unlock(&c->cs_lock);
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return err;
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}
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/**
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* ubifs_gc_should_commit - determine if it is time for GC to run commit.
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* @c: UBIFS file-system description object
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*
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* This function is called by garbage collection to determine if commit should
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* be run. If commit state is @COMMIT_BACKGROUND, which means that the journal
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* is full enough to start commit, this function returns true. It is not
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* absolutely necessary to commit yet, but it feels like this should be better
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* then to keep doing GC. This function returns %1 if GC has to initiate commit
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* and %0 if not.
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*/
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int ubifs_gc_should_commit(struct ubifs_info *c)
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{
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int ret = 0;
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spin_lock(&c->cs_lock);
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if (c->cmt_state == COMMIT_BACKGROUND) {
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dbg_cmt("commit required now");
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c->cmt_state = COMMIT_REQUIRED;
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} else
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dbg_cmt("commit not requested");
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if (c->cmt_state == COMMIT_REQUIRED)
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ret = 1;
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spin_unlock(&c->cs_lock);
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return ret;
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}
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#ifdef CONFIG_UBIFS_FS_DEBUG
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/**
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* struct idx_node - hold index nodes during index tree traversal.
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* @list: list
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* @iip: index in parent (slot number of this indexing node in the parent
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* indexing node)
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* @upper_key: all keys in this indexing node have to be less or equivalent to
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* this key
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* @idx: index node (8-byte aligned because all node structures must be 8-byte
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* aligned)
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*/
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struct idx_node {
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struct list_head list;
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int iip;
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union ubifs_key upper_key;
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struct ubifs_idx_node idx __attribute__((aligned(8)));
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};
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/**
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* dbg_old_index_check_init - get information for the next old index check.
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* @c: UBIFS file-system description object
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* @zroot: root of the index
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*
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* This function records information about the index that will be needed for the
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* next old index check i.e. 'dbg_check_old_index()'.
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*
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* This function returns %0 on success and a negative error code on failure.
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*/
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int dbg_old_index_check_init(struct ubifs_info *c, struct ubifs_zbranch *zroot)
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{
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struct ubifs_idx_node *idx;
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int lnum, offs, len, err = 0;
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c->old_zroot = *zroot;
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lnum = c->old_zroot.lnum;
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offs = c->old_zroot.offs;
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len = c->old_zroot.len;
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idx = kmalloc(c->max_idx_node_sz, GFP_NOFS);
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if (!idx)
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return -ENOMEM;
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|
|
err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
|
|
if (err)
|
|
goto out;
|
|
|
|
c->old_zroot_level = le16_to_cpu(idx->level);
|
|
c->old_zroot_sqnum = le64_to_cpu(idx->ch.sqnum);
|
|
out:
|
|
kfree(idx);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* dbg_check_old_index - check the old copy of the index.
|
|
* @c: UBIFS file-system description object
|
|
* @zroot: root of the new index
|
|
*
|
|
* In order to be able to recover from an unclean unmount, a complete copy of
|
|
* the index must exist on flash. This is the "old" index. The commit process
|
|
* must write the "new" index to flash without overwriting or destroying any
|
|
* part of the old index. This function is run at commit end in order to check
|
|
* that the old index does indeed exist completely intact.
|
|
*
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
*/
|
|
int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot)
|
|
{
|
|
int lnum, offs, len, err = 0, uninitialized_var(last_level), child_cnt;
|
|
int first = 1, iip;
|
|
union ubifs_key lower_key, upper_key, l_key, u_key;
|
|
unsigned long long uninitialized_var(last_sqnum);
|
|
struct ubifs_idx_node *idx;
|
|
struct list_head list;
|
|
struct idx_node *i;
|
|
size_t sz;
|
|
|
|
if (!(ubifs_chk_flags & UBIFS_CHK_OLD_IDX))
|
|
goto out;
|
|
|
|
INIT_LIST_HEAD(&list);
|
|
|
|
sz = sizeof(struct idx_node) + ubifs_idx_node_sz(c, c->fanout) -
|
|
UBIFS_IDX_NODE_SZ;
|
|
|
|
/* Start at the old zroot */
|
|
lnum = c->old_zroot.lnum;
|
|
offs = c->old_zroot.offs;
|
|
len = c->old_zroot.len;
|
|
iip = 0;
|
|
|
|
/*
|
|
* Traverse the index tree preorder depth-first i.e. do a node and then
|
|
* its subtrees from left to right.
|
|
*/
|
|
while (1) {
|
|
struct ubifs_branch *br;
|
|
|
|
/* Get the next index node */
|
|
i = kmalloc(sz, GFP_NOFS);
|
|
if (!i) {
|
|
err = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
i->iip = iip;
|
|
/* Keep the index nodes on our path in a linked list */
|
|
list_add_tail(&i->list, &list);
|
|
/* Read the index node */
|
|
idx = &i->idx;
|
|
err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
|
|
if (err)
|
|
goto out_free;
|
|
/* Validate index node */
|
|
child_cnt = le16_to_cpu(idx->child_cnt);
|
|
if (child_cnt < 1 || child_cnt > c->fanout) {
|
|
err = 1;
|
|
goto out_dump;
|
|
}
|
|
if (first) {
|
|
first = 0;
|
|
/* Check root level and sqnum */
|
|
if (le16_to_cpu(idx->level) != c->old_zroot_level) {
|
|
err = 2;
|
|
goto out_dump;
|
|
}
|
|
if (le64_to_cpu(idx->ch.sqnum) != c->old_zroot_sqnum) {
|
|
err = 3;
|
|
goto out_dump;
|
|
}
|
|
/* Set last values as though root had a parent */
|
|
last_level = le16_to_cpu(idx->level) + 1;
|
|
last_sqnum = le64_to_cpu(idx->ch.sqnum) + 1;
|
|
key_read(c, ubifs_idx_key(c, idx), &lower_key);
|
|
highest_ino_key(c, &upper_key, INUM_WATERMARK);
|
|
}
|
|
key_copy(c, &upper_key, &i->upper_key);
|
|
if (le16_to_cpu(idx->level) != last_level - 1) {
|
|
err = 3;
|
|
goto out_dump;
|
|
}
|
|
/*
|
|
* The index is always written bottom up hence a child's sqnum
|
|
* is always less than the parents.
|
|
*/
|
|
if (le64_to_cpu(idx->ch.sqnum) >= last_sqnum) {
|
|
err = 4;
|
|
goto out_dump;
|
|
}
|
|
/* Check key range */
|
|
key_read(c, ubifs_idx_key(c, idx), &l_key);
|
|
br = ubifs_idx_branch(c, idx, child_cnt - 1);
|
|
key_read(c, &br->key, &u_key);
|
|
if (keys_cmp(c, &lower_key, &l_key) > 0) {
|
|
err = 5;
|
|
goto out_dump;
|
|
}
|
|
if (keys_cmp(c, &upper_key, &u_key) < 0) {
|
|
err = 6;
|
|
goto out_dump;
|
|
}
|
|
if (keys_cmp(c, &upper_key, &u_key) == 0)
|
|
if (!is_hash_key(c, &u_key)) {
|
|
err = 7;
|
|
goto out_dump;
|
|
}
|
|
/* Go to next index node */
|
|
if (le16_to_cpu(idx->level) == 0) {
|
|
/* At the bottom, so go up until can go right */
|
|
while (1) {
|
|
/* Drop the bottom of the list */
|
|
list_del(&i->list);
|
|
kfree(i);
|
|
/* No more list means we are done */
|
|
if (list_empty(&list))
|
|
goto out;
|
|
/* Look at the new bottom */
|
|
i = list_entry(list.prev, struct idx_node,
|
|
list);
|
|
idx = &i->idx;
|
|
/* Can we go right */
|
|
if (iip + 1 < le16_to_cpu(idx->child_cnt)) {
|
|
iip = iip + 1;
|
|
break;
|
|
} else
|
|
/* Nope, so go up again */
|
|
iip = i->iip;
|
|
}
|
|
} else
|
|
/* Go down left */
|
|
iip = 0;
|
|
/*
|
|
* We have the parent in 'idx' and now we set up for reading the
|
|
* child pointed to by slot 'iip'.
|
|
*/
|
|
last_level = le16_to_cpu(idx->level);
|
|
last_sqnum = le64_to_cpu(idx->ch.sqnum);
|
|
br = ubifs_idx_branch(c, idx, iip);
|
|
lnum = le32_to_cpu(br->lnum);
|
|
offs = le32_to_cpu(br->offs);
|
|
len = le32_to_cpu(br->len);
|
|
key_read(c, &br->key, &lower_key);
|
|
if (iip + 1 < le16_to_cpu(idx->child_cnt)) {
|
|
br = ubifs_idx_branch(c, idx, iip + 1);
|
|
key_read(c, &br->key, &upper_key);
|
|
} else
|
|
key_copy(c, &i->upper_key, &upper_key);
|
|
}
|
|
out:
|
|
err = dbg_old_index_check_init(c, zroot);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
return 0;
|
|
|
|
out_dump:
|
|
dbg_err("dumping index node (iip=%d)", i->iip);
|
|
dbg_dump_node(c, idx);
|
|
list_del(&i->list);
|
|
kfree(i);
|
|
if (!list_empty(&list)) {
|
|
i = list_entry(list.prev, struct idx_node, list);
|
|
dbg_err("dumping parent index node");
|
|
dbg_dump_node(c, &i->idx);
|
|
}
|
|
out_free:
|
|
while (!list_empty(&list)) {
|
|
i = list_entry(list.next, struct idx_node, list);
|
|
list_del(&i->list);
|
|
kfree(i);
|
|
}
|
|
ubifs_err("failed, error %d", err);
|
|
if (err > 0)
|
|
err = -EINVAL;
|
|
return err;
|
|
}
|
|
|
|
#endif /* CONFIG_UBIFS_FS_DEBUG */
|