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![Andreas Gruenbacher](/assets/img/avatar_default.png)
Rename the "gfs_recovery" workqueue to "gfs2_recovery", and gfs_recovery_wq to gfs2_recovery_wq. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
582 lines
15 KiB
C
582 lines
15 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 *gfs2_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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u64 dblock;
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u32 extlen;
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int error;
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extlen = 32;
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error = gfs2_get_extent(&ip->i_inode, blk, &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 = NULL, *iter;
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list_for_each_entry(iter, head, rr_list) {
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if (iter->rr_blkno == blkno) {
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rr = iter;
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break;
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}
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}
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if (rr) {
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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 = NULL, *iter;
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int wrap, a, b, revoke;
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list_for_each_entry(iter, &jd->jd_revoke_list, rr_list) {
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if (iter->rr_blkno == blkno) {
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rr = iter;
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break;
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}
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}
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if (!rr)
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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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* @head: 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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* @pass: iteration number (foreach_descriptor() is called in a for() loop)
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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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/**
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* update_statfs_inode - Update the master statfs inode or zero out the local
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* statfs inode for a given journal.
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* @jd: The journal
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* @head: If NULL, @inode is the local statfs inode and we need to zero it out.
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* Otherwise, it @head contains the statfs change info that needs to be
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* synced to the master statfs inode (pointed to by @inode).
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* @inode: statfs inode to update.
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*/
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static int update_statfs_inode(struct gfs2_jdesc *jd,
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struct gfs2_log_header_host *head,
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struct inode *inode)
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{
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struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
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struct gfs2_inode *ip;
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struct buffer_head *bh;
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struct gfs2_statfs_change_host sc;
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int error = 0;
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BUG_ON(!inode);
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ip = GFS2_I(inode);
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error = gfs2_meta_inode_buffer(ip, &bh);
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if (error)
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goto out;
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spin_lock(&sdp->sd_statfs_spin);
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if (head) { /* Update the master statfs inode */
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gfs2_statfs_change_in(&sc, bh->b_data + sizeof(struct gfs2_dinode));
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sc.sc_total += head->lh_local_total;
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sc.sc_free += head->lh_local_free;
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sc.sc_dinodes += head->lh_local_dinodes;
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gfs2_statfs_change_out(&sc, bh->b_data + sizeof(struct gfs2_dinode));
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fs_info(sdp, "jid=%u: Updated master statfs Total:%lld, "
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"Free:%lld, Dinodes:%lld after change "
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"[%+lld,%+lld,%+lld]\n", jd->jd_jid, sc.sc_total,
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sc.sc_free, sc.sc_dinodes, head->lh_local_total,
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head->lh_local_free, head->lh_local_dinodes);
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} else { /* Zero out the local statfs inode */
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memset(bh->b_data + sizeof(struct gfs2_dinode), 0,
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sizeof(struct gfs2_statfs_change));
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/* If it's our own journal, reset any in-memory changes too */
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if (jd->jd_jid == sdp->sd_lockstruct.ls_jid) {
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memset(&sdp->sd_statfs_local, 0,
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sizeof(struct gfs2_statfs_change_host));
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}
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}
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spin_unlock(&sdp->sd_statfs_spin);
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mark_buffer_dirty(bh);
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brelse(bh);
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gfs2_inode_metasync(ip->i_gl);
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out:
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return error;
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}
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/**
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* recover_local_statfs - Update the master and local statfs changes for this
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* journal.
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*
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* Previously, statfs updates would be read in from the local statfs inode and
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* synced to the master statfs inode during recovery.
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*
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* We now use the statfs updates in the journal head to update the master statfs
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* inode instead of reading in from the local statfs inode. To preserve backward
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* compatibility with kernels that can't do this, we still need to keep the
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* local statfs inode up to date by writing changes to it. At some point in the
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* future, we can do away with the local statfs inodes altogether and keep the
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* statfs changes solely in the journal.
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*
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* @jd: the journal
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* @head: the journal head
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*
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* Returns: errno
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*/
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static void recover_local_statfs(struct gfs2_jdesc *jd,
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struct gfs2_log_header_host *head)
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{
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int error;
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struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
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if (!head->lh_local_total && !head->lh_local_free
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&& !head->lh_local_dinodes) /* No change */
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goto zero_local;
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/* First update the master statfs inode with the changes we
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* found in the journal. */
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error = update_statfs_inode(jd, head, sdp->sd_statfs_inode);
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if (error)
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goto out;
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zero_local:
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/* Zero out the local statfs inode so any changes in there
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* are not re-recovered. */
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error = update_statfs_inode(jd, NULL,
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find_local_statfs_inode(sdp, jd->jd_jid));
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out:
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return;
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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;
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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 glock...\n",
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jd->jd_jid);
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jlocked = 1;
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/* Acquire the journal glock 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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goto fail;
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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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mutex_lock(&sdp->sd_freeze_mutex);
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|
|
if (test_bit(SDF_FROZEN, &sdp->sd_flags)) {
|
|
mutex_unlock(&sdp->sd_freeze_mutex);
|
|
fs_warn(sdp, "jid=%u: Can't replay: filesystem "
|
|
"is frozen\n", jd->jd_jid);
|
|
goto fail_gunlock_ji;
|
|
}
|
|
|
|
if (test_bit(SDF_RORECOVERY, &sdp->sd_flags)) {
|
|
ro = 1;
|
|
} else if (test_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags)) {
|
|
if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
|
|
ro = 1;
|
|
} else {
|
|
if (sb_rdonly(sdp->sd_vfs)) {
|
|
/* check if device itself is read-only */
|
|
ro = bdev_read_only(sdp->sd_vfs->s_bdev);
|
|
if (!ro) {
|
|
fs_info(sdp, "recovery required on "
|
|
"read-only filesystem.\n");
|
|
fs_info(sdp, "write access will be "
|
|
"enabled during recovery.\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ro) {
|
|
fs_warn(sdp, "jid=%u: Can't replay: read-only block "
|
|
"device\n", jd->jd_jid);
|
|
error = -EROFS;
|
|
goto fail_gunlock_nofreeze;
|
|
}
|
|
|
|
t_tlck = ktime_get();
|
|
fs_info(sdp, "jid=%u: Replaying journal...0x%x to 0x%x\n",
|
|
jd->jd_jid, head.lh_tail, head.lh_blkno);
|
|
|
|
/* We take the sd_log_flush_lock here primarily to prevent log
|
|
* flushes and simultaneous journal replays from stomping on
|
|
* each other wrt jd_log_bio. */
|
|
down_read(&sdp->sd_log_flush_lock);
|
|
for (pass = 0; pass < 2; pass++) {
|
|
lops_before_scan(jd, &head, pass);
|
|
error = foreach_descriptor(jd, head.lh_tail,
|
|
head.lh_blkno, pass);
|
|
lops_after_scan(jd, error, pass);
|
|
if (error) {
|
|
up_read(&sdp->sd_log_flush_lock);
|
|
goto fail_gunlock_nofreeze;
|
|
}
|
|
}
|
|
|
|
recover_local_statfs(jd, &head);
|
|
clean_journal(jd, &head);
|
|
up_read(&sdp->sd_log_flush_lock);
|
|
|
|
mutex_unlock(&sdp->sd_freeze_mutex);
|
|
t_rep = ktime_get();
|
|
fs_info(sdp, "jid=%u: Journal replayed in %lldms [jlck:%lldms, "
|
|
"jhead:%lldms, tlck:%lldms, replay:%lldms]\n",
|
|
jd->jd_jid, ktime_ms_delta(t_rep, t_start),
|
|
ktime_ms_delta(t_jlck, t_start),
|
|
ktime_ms_delta(t_jhd, t_jlck),
|
|
ktime_ms_delta(t_tlck, t_jhd),
|
|
ktime_ms_delta(t_rep, t_tlck));
|
|
}
|
|
|
|
gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_SUCCESS);
|
|
|
|
if (jlocked) {
|
|
gfs2_glock_dq_uninit(&ji_gh);
|
|
gfs2_glock_dq_uninit(&j_gh);
|
|
}
|
|
|
|
fs_info(sdp, "jid=%u: Done\n", jd->jd_jid);
|
|
goto done;
|
|
|
|
fail_gunlock_nofreeze:
|
|
mutex_unlock(&sdp->sd_freeze_mutex);
|
|
fail_gunlock_ji:
|
|
if (jlocked) {
|
|
gfs2_glock_dq_uninit(&ji_gh);
|
|
fail_gunlock_j:
|
|
gfs2_glock_dq_uninit(&j_gh);
|
|
}
|
|
|
|
fs_info(sdp, "jid=%u: %s\n", jd->jd_jid, (error) ? "Failed" : "Done");
|
|
fail:
|
|
jd->jd_recover_error = error;
|
|
gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_GAVEUP);
|
|
done:
|
|
clear_bit(JDF_RECOVERY, &jd->jd_flags);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(&jd->jd_flags, JDF_RECOVERY);
|
|
}
|
|
|
|
int gfs2_recover_journal(struct gfs2_jdesc *jd, bool wait)
|
|
{
|
|
int rv;
|
|
|
|
if (test_and_set_bit(JDF_RECOVERY, &jd->jd_flags))
|
|
return -EBUSY;
|
|
|
|
/* we have JDF_RECOVERY, queue should always succeed */
|
|
rv = queue_work(gfs2_recovery_wq, &jd->jd_work);
|
|
BUG_ON(!rv);
|
|
|
|
if (wait)
|
|
wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
|
|
TASK_UNINTERRUPTIBLE);
|
|
|
|
return wait ? jd->jd_recover_error : 0;
|
|
}
|
|
|