479 lines
12 KiB
C
479 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/crc32c.h>
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#include <linux/ktime.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "glock.h"
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#include "glops.h"
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#include "log.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "recovery.h"
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#include "super.h"
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#include "util.h"
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#include "dir.h"
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struct workqueue_struct *gfs_recovery_wq;
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int gfs2_replay_read_block(struct gfs2_jdesc *jd, unsigned int blk,
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struct buffer_head **bh)
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{
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struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
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struct gfs2_glock *gl = ip->i_gl;
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int new = 0;
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u64 dblock;
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u32 extlen;
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int error;
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error = gfs2_extent_map(&ip->i_inode, blk, &new, &dblock, &extlen);
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if (error)
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return error;
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if (!dblock) {
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gfs2_consist_inode(ip);
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return -EIO;
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}
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*bh = gfs2_meta_ra(gl, dblock, extlen);
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return error;
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}
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int gfs2_revoke_add(struct gfs2_jdesc *jd, u64 blkno, unsigned int where)
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{
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struct list_head *head = &jd->jd_revoke_list;
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struct gfs2_revoke_replay *rr;
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int found = 0;
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list_for_each_entry(rr, head, rr_list) {
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if (rr->rr_blkno == blkno) {
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found = 1;
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break;
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}
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}
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if (found) {
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rr->rr_where = where;
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return 0;
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}
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rr = kmalloc(sizeof(struct gfs2_revoke_replay), GFP_NOFS);
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if (!rr)
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return -ENOMEM;
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rr->rr_blkno = blkno;
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rr->rr_where = where;
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list_add(&rr->rr_list, head);
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return 1;
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}
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int gfs2_revoke_check(struct gfs2_jdesc *jd, u64 blkno, unsigned int where)
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{
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struct gfs2_revoke_replay *rr;
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int wrap, a, b, revoke;
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int found = 0;
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list_for_each_entry(rr, &jd->jd_revoke_list, rr_list) {
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if (rr->rr_blkno == blkno) {
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found = 1;
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break;
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}
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}
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if (!found)
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return 0;
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wrap = (rr->rr_where < jd->jd_replay_tail);
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a = (jd->jd_replay_tail < where);
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b = (where < rr->rr_where);
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revoke = (wrap) ? (a || b) : (a && b);
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return revoke;
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}
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void gfs2_revoke_clean(struct gfs2_jdesc *jd)
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{
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struct list_head *head = &jd->jd_revoke_list;
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struct gfs2_revoke_replay *rr;
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while (!list_empty(head)) {
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rr = list_first_entry(head, struct gfs2_revoke_replay, rr_list);
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list_del(&rr->rr_list);
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kfree(rr);
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}
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}
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int __get_log_header(struct gfs2_sbd *sdp, const struct gfs2_log_header *lh,
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unsigned int blkno, struct gfs2_log_header_host *head)
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{
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u32 hash, crc;
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if (lh->lh_header.mh_magic != cpu_to_be32(GFS2_MAGIC) ||
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lh->lh_header.mh_type != cpu_to_be32(GFS2_METATYPE_LH) ||
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(blkno && be32_to_cpu(lh->lh_blkno) != blkno))
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return 1;
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hash = crc32(~0, lh, LH_V1_SIZE - 4);
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hash = ~crc32_le_shift(hash, 4); /* assume lh_hash is zero */
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if (be32_to_cpu(lh->lh_hash) != hash)
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return 1;
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crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
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sdp->sd_sb.sb_bsize - LH_V1_SIZE - 4);
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if ((lh->lh_crc != 0 && be32_to_cpu(lh->lh_crc) != crc))
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return 1;
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head->lh_sequence = be64_to_cpu(lh->lh_sequence);
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head->lh_flags = be32_to_cpu(lh->lh_flags);
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head->lh_tail = be32_to_cpu(lh->lh_tail);
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head->lh_blkno = be32_to_cpu(lh->lh_blkno);
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head->lh_local_total = be64_to_cpu(lh->lh_local_total);
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head->lh_local_free = be64_to_cpu(lh->lh_local_free);
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head->lh_local_dinodes = be64_to_cpu(lh->lh_local_dinodes);
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return 0;
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}
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/**
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* get_log_header - read the log header for a given segment
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* @jd: the journal
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* @blk: the block to look at
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* @lh: the log header to return
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*
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* Read the log header for a given segement in a given journal. Do a few
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* sanity checks on it.
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*
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* Returns: 0 on success,
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* 1 if the header was invalid or incomplete,
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* errno on error
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*/
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static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
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struct gfs2_log_header_host *head)
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{
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struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
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struct buffer_head *bh;
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int error;
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error = gfs2_replay_read_block(jd, blk, &bh);
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if (error)
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return error;
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error = __get_log_header(sdp, (const struct gfs2_log_header *)bh->b_data,
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blk, head);
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brelse(bh);
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return error;
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}
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/**
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* foreach_descriptor - go through the active part of the log
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* @jd: the journal
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* @start: the first log header in the active region
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* @end: the last log header (don't process the contents of this entry))
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*
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* Call a given function once for every log descriptor in the active
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* portion of the log.
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*
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* Returns: errno
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*/
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static int foreach_descriptor(struct gfs2_jdesc *jd, u32 start,
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unsigned int end, int pass)
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{
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struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
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struct buffer_head *bh;
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struct gfs2_log_descriptor *ld;
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int error = 0;
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u32 length;
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__be64 *ptr;
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unsigned int offset = sizeof(struct gfs2_log_descriptor);
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offset += sizeof(__be64) - 1;
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offset &= ~(sizeof(__be64) - 1);
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while (start != end) {
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error = gfs2_replay_read_block(jd, start, &bh);
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if (error)
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return error;
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if (gfs2_meta_check(sdp, bh)) {
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brelse(bh);
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return -EIO;
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}
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ld = (struct gfs2_log_descriptor *)bh->b_data;
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length = be32_to_cpu(ld->ld_length);
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if (be32_to_cpu(ld->ld_header.mh_type) == GFS2_METATYPE_LH) {
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struct gfs2_log_header_host lh;
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error = get_log_header(jd, start, &lh);
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if (!error) {
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gfs2_replay_incr_blk(jd, &start);
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brelse(bh);
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continue;
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}
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if (error == 1) {
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gfs2_consist_inode(GFS2_I(jd->jd_inode));
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error = -EIO;
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}
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brelse(bh);
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return error;
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} else if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LD)) {
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brelse(bh);
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return -EIO;
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}
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ptr = (__be64 *)(bh->b_data + offset);
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error = lops_scan_elements(jd, start, ld, ptr, pass);
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if (error) {
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brelse(bh);
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return error;
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}
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while (length--)
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gfs2_replay_incr_blk(jd, &start);
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brelse(bh);
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}
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return 0;
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}
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/**
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* clean_journal - mark a dirty journal as being clean
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* @jd: the journal
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* @head: the head journal to start from
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*
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* Returns: errno
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*/
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static void clean_journal(struct gfs2_jdesc *jd,
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struct gfs2_log_header_host *head)
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{
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struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
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u32 lblock = head->lh_blkno;
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gfs2_replay_incr_blk(jd, &lblock);
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gfs2_write_log_header(sdp, jd, head->lh_sequence + 1, 0, lblock,
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GFS2_LOG_HEAD_UNMOUNT | GFS2_LOG_HEAD_RECOVERY,
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REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC);
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if (jd->jd_jid == sdp->sd_lockstruct.ls_jid) {
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sdp->sd_log_flush_head = lblock;
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gfs2_log_incr_head(sdp);
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}
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}
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static void gfs2_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
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unsigned int message)
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{
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char env_jid[20];
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char env_status[20];
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char *envp[] = { env_jid, env_status, NULL };
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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ls->ls_recover_jid_done = jid;
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ls->ls_recover_jid_status = message;
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sprintf(env_jid, "JID=%u", jid);
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sprintf(env_status, "RECOVERY=%s",
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message == LM_RD_SUCCESS ? "Done" : "Failed");
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kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
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if (sdp->sd_lockstruct.ls_ops->lm_recovery_result)
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sdp->sd_lockstruct.ls_ops->lm_recovery_result(sdp, jid, message);
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}
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void gfs2_recover_func(struct work_struct *work)
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{
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struct gfs2_jdesc *jd = container_of(work, struct gfs2_jdesc, jd_work);
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struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
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struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
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struct gfs2_log_header_host head;
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struct gfs2_holder j_gh, ji_gh, thaw_gh;
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ktime_t t_start, t_jlck, t_jhd, t_tlck, t_rep;
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int ro = 0;
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unsigned int pass;
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int error = 0;
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int jlocked = 0;
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if (gfs2_withdrawn(sdp)) {
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fs_err(sdp, "jid=%u: Recovery not attempted due to withdraw.\n",
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jd->jd_jid);
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goto fail;
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}
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t_start = ktime_get();
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if (sdp->sd_args.ar_spectator)
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goto fail;
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if (jd->jd_jid != sdp->sd_lockstruct.ls_jid) {
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fs_info(sdp, "jid=%u: Trying to acquire journal lock...\n",
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jd->jd_jid);
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jlocked = 1;
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/* Acquire the journal lock so we can do recovery */
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error = gfs2_glock_nq_num(sdp, jd->jd_jid, &gfs2_journal_glops,
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LM_ST_EXCLUSIVE,
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LM_FLAG_NOEXP | LM_FLAG_TRY | GL_NOCACHE,
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&j_gh);
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switch (error) {
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case 0:
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break;
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case GLR_TRYFAILED:
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fs_info(sdp, "jid=%u: Busy\n", jd->jd_jid);
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error = 0;
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default:
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goto fail;
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}
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
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LM_FLAG_NOEXP | GL_NOCACHE, &ji_gh);
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if (error)
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goto fail_gunlock_j;
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} else {
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fs_info(sdp, "jid=%u, already locked for use\n", jd->jd_jid);
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}
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t_jlck = ktime_get();
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fs_info(sdp, "jid=%u: Looking at journal...\n", jd->jd_jid);
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error = gfs2_jdesc_check(jd);
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if (error)
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goto fail_gunlock_ji;
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error = gfs2_find_jhead(jd, &head, true);
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if (error)
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goto fail_gunlock_ji;
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t_jhd = ktime_get();
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fs_info(sdp, "jid=%u: Journal head lookup took %lldms\n", jd->jd_jid,
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ktime_ms_delta(t_jhd, t_jlck));
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if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
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fs_info(sdp, "jid=%u: Acquiring the transaction lock...\n",
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jd->jd_jid);
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/* Acquire a shared hold on the freeze lock */
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error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
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LM_FLAG_NOEXP | LM_FLAG_PRIORITY |
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GL_EXACT, &thaw_gh);
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if (error)
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goto fail_gunlock_ji;
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if (test_bit(SDF_RORECOVERY, &sdp->sd_flags)) {
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ro = 1;
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} else if (test_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags)) {
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if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
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ro = 1;
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} else {
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if (sb_rdonly(sdp->sd_vfs)) {
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/* check if device itself is read-only */
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ro = bdev_read_only(sdp->sd_vfs->s_bdev);
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if (!ro) {
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fs_info(sdp, "recovery required on "
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"read-only filesystem.\n");
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fs_info(sdp, "write access will be "
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"enabled during recovery.\n");
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}
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}
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}
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if (ro) {
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fs_warn(sdp, "jid=%u: Can't replay: read-only block "
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"device\n", jd->jd_jid);
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error = -EROFS;
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goto fail_gunlock_thaw;
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}
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t_tlck = ktime_get();
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fs_info(sdp, "jid=%u: Replaying journal...0x%x to 0x%x\n",
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jd->jd_jid, head.lh_tail, head.lh_blkno);
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/* We take the sd_log_flush_lock here primarily to prevent log
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* flushes and simultaneous journal replays from stomping on
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* each other wrt sd_log_bio. */
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down_read(&sdp->sd_log_flush_lock);
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for (pass = 0; pass < 2; pass++) {
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lops_before_scan(jd, &head, pass);
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error = foreach_descriptor(jd, head.lh_tail,
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head.lh_blkno, pass);
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lops_after_scan(jd, error, pass);
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if (error)
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goto fail_gunlock_thaw;
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}
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clean_journal(jd, &head);
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up_read(&sdp->sd_log_flush_lock);
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gfs2_glock_dq_uninit(&thaw_gh);
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t_rep = ktime_get();
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fs_info(sdp, "jid=%u: Journal replayed in %lldms [jlck:%lldms, "
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"jhead:%lldms, tlck:%lldms, replay:%lldms]\n",
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jd->jd_jid, ktime_ms_delta(t_rep, t_start),
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ktime_ms_delta(t_jlck, t_start),
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ktime_ms_delta(t_jhd, t_jlck),
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ktime_ms_delta(t_tlck, t_jhd),
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ktime_ms_delta(t_rep, t_tlck));
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}
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gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_SUCCESS);
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if (jlocked) {
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gfs2_glock_dq_uninit(&ji_gh);
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gfs2_glock_dq_uninit(&j_gh);
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}
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fs_info(sdp, "jid=%u: Done\n", jd->jd_jid);
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goto done;
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fail_gunlock_thaw:
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gfs2_glock_dq_uninit(&thaw_gh);
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fail_gunlock_ji:
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if (jlocked) {
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gfs2_glock_dq_uninit(&ji_gh);
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fail_gunlock_j:
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gfs2_glock_dq_uninit(&j_gh);
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}
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fs_info(sdp, "jid=%u: %s\n", jd->jd_jid, (error) ? "Failed" : "Done");
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fail:
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jd->jd_recover_error = error;
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gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_GAVEUP);
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done:
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clear_bit(JDF_RECOVERY, &jd->jd_flags);
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smp_mb__after_atomic();
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wake_up_bit(&jd->jd_flags, JDF_RECOVERY);
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}
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int gfs2_recover_journal(struct gfs2_jdesc *jd, bool wait)
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{
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int rv;
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if (test_and_set_bit(JDF_RECOVERY, &jd->jd_flags))
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return -EBUSY;
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/* we have JDF_RECOVERY, queue should always succeed */
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rv = queue_work(gfs_recovery_wq, &jd->jd_work);
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BUG_ON(!rv);
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if (wait)
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wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
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TASK_UNINTERRUPTIBLE);
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return wait ? jd->jd_recover_error : 0;
|
|
}
|
|
|