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![Andreas Gruenbacher](/assets/img/avatar_default.png)
Function gfs2_withdraw() tries to synchronize concurrent callers by atomically setting the SDF_WITHDRAWN flag in the first caller, setting the SDF_WITHDRAW_IN_PROG flag to indicate that a withdraw is in progress, performing the actual withdraw, and clearing the SDF_WITHDRAW_IN_PROG flag when done. All other callers wait for the SDF_WITHDRAW_IN_PROG flag to be cleared before returning. This leaves a small window in which callers can find the SDF_WITHDRAWN flag set before the SDF_WITHDRAW_IN_PROG flag has been set, causing them to return prematurely, before the withdraw has been completed. Fix that by setting the SDF_WITHDRAWN and SDF_WITHDRAW_IN_PROG flags atomically. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
561 lines
16 KiB
C
561 lines
16 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/kthread.h>
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#include <linux/crc32.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include "gfs2.h"
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#include "incore.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 "recovery.h"
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#include "rgrp.h"
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#include "super.h"
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#include "util.h"
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struct kmem_cache *gfs2_glock_cachep __read_mostly;
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struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
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struct kmem_cache *gfs2_inode_cachep __read_mostly;
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struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
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struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
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struct kmem_cache *gfs2_quotad_cachep __read_mostly;
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struct kmem_cache *gfs2_qadata_cachep __read_mostly;
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struct kmem_cache *gfs2_trans_cachep __read_mostly;
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mempool_t *gfs2_page_pool __read_mostly;
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void gfs2_assert_i(struct gfs2_sbd *sdp)
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{
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fs_emerg(sdp, "fatal assertion failed\n");
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}
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/**
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* check_journal_clean - Make sure a journal is clean for a spectator mount
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* @sdp: The GFS2 superblock
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* @jd: The journal descriptor
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* @verbose: Show more prints in the log
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*
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* Returns: 0 if the journal is clean or locked, else an error
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*/
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int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
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bool verbose)
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{
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int error;
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struct gfs2_holder j_gh;
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struct gfs2_log_header_host head;
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struct gfs2_inode *ip;
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ip = GFS2_I(jd->jd_inode);
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
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GL_EXACT | GL_NOCACHE, &j_gh);
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if (error) {
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if (verbose)
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fs_err(sdp, "Error %d locking journal for spectator "
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"mount.\n", error);
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return -EPERM;
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}
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error = gfs2_jdesc_check(jd);
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if (error) {
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if (verbose)
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fs_err(sdp, "Error checking journal for spectator "
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"mount.\n");
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goto out_unlock;
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}
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error = gfs2_find_jhead(jd, &head, false);
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if (error) {
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if (verbose)
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fs_err(sdp, "Error parsing journal for spectator "
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"mount.\n");
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goto out_unlock;
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}
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if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
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error = -EPERM;
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if (verbose)
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fs_err(sdp, "jid=%u: Journal is dirty, so the first "
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"mounter must not be a spectator.\n",
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jd->jd_jid);
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}
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out_unlock:
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gfs2_glock_dq_uninit(&j_gh);
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return error;
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}
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/**
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* gfs2_freeze_lock_shared - hold the freeze glock
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* @sdp: the superblock
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*/
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int gfs2_freeze_lock_shared(struct gfs2_sbd *sdp)
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{
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int error;
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error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
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LM_FLAG_NOEXP | GL_EXACT,
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&sdp->sd_freeze_gh);
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if (error)
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fs_err(sdp, "can't lock the freeze glock: %d\n", error);
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return error;
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}
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void gfs2_freeze_unlock(struct gfs2_holder *freeze_gh)
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{
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if (gfs2_holder_initialized(freeze_gh))
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gfs2_glock_dq_uninit(freeze_gh);
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}
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static void signal_our_withdraw(struct gfs2_sbd *sdp)
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{
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struct gfs2_glock *live_gl = sdp->sd_live_gh.gh_gl;
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struct inode *inode;
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struct gfs2_inode *ip;
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struct gfs2_glock *i_gl;
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u64 no_formal_ino;
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int ret = 0;
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int tries;
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if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) || !sdp->sd_jdesc)
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return;
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gfs2_ail_drain(sdp); /* frees all transactions */
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inode = sdp->sd_jdesc->jd_inode;
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ip = GFS2_I(inode);
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i_gl = ip->i_gl;
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no_formal_ino = ip->i_no_formal_ino;
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/* Prevent any glock dq until withdraw recovery is complete */
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set_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
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/*
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* Don't tell dlm we're bailing until we have no more buffers in the
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* wind. If journal had an IO error, the log code should just purge
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* the outstanding buffers rather than submitting new IO. Making the
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* file system read-only will flush the journal, etc.
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*
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* During a normal unmount, gfs2_make_fs_ro calls gfs2_log_shutdown
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* which clears SDF_JOURNAL_LIVE. In a withdraw, we must not write
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* any UNMOUNT log header, so we can't call gfs2_log_shutdown, and
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* therefore we need to clear SDF_JOURNAL_LIVE manually.
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*/
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clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
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if (!sb_rdonly(sdp->sd_vfs)) {
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bool locked = mutex_trylock(&sdp->sd_freeze_mutex);
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wake_up(&sdp->sd_logd_waitq);
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wake_up(&sdp->sd_quota_wait);
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wait_event_timeout(sdp->sd_log_waitq,
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gfs2_log_is_empty(sdp),
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HZ * 5);
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sdp->sd_vfs->s_flags |= SB_RDONLY;
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if (locked)
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mutex_unlock(&sdp->sd_freeze_mutex);
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/*
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* Dequeue any pending non-system glock holders that can no
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* longer be granted because the file system is withdrawn.
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*/
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gfs2_gl_dq_holders(sdp);
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}
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if (sdp->sd_lockstruct.ls_ops->lm_lock == NULL) { /* lock_nolock */
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if (!ret)
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ret = -EIO;
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clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
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goto skip_recovery;
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}
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/*
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* Drop the glock for our journal so another node can recover it.
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*/
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if (gfs2_holder_initialized(&sdp->sd_journal_gh)) {
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gfs2_glock_dq_wait(&sdp->sd_journal_gh);
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gfs2_holder_uninit(&sdp->sd_journal_gh);
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}
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sdp->sd_jinode_gh.gh_flags |= GL_NOCACHE;
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gfs2_glock_dq(&sdp->sd_jinode_gh);
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gfs2_thaw_freeze_initiator(sdp->sd_vfs);
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wait_on_bit(&i_gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE);
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/*
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* holder_uninit to force glock_put, to force dlm to let go
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*/
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gfs2_holder_uninit(&sdp->sd_jinode_gh);
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/*
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* Note: We need to be careful here:
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* Our iput of jd_inode will evict it. The evict will dequeue its
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* glock, but the glock dq will wait for the withdraw unless we have
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* exception code in glock_dq.
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*/
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iput(inode);
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sdp->sd_jdesc->jd_inode = NULL;
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/*
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* Wait until the journal inode's glock is freed. This allows try locks
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* on other nodes to be successful, otherwise we remain the owner of
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* the glock as far as dlm is concerned.
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*/
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if (i_gl->gl_ops->go_free) {
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set_bit(GLF_FREEING, &i_gl->gl_flags);
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wait_on_bit(&i_gl->gl_flags, GLF_FREEING, TASK_UNINTERRUPTIBLE);
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}
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/*
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* Dequeue the "live" glock, but keep a reference so it's never freed.
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*/
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gfs2_glock_hold(live_gl);
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gfs2_glock_dq_wait(&sdp->sd_live_gh);
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/*
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* We enqueue the "live" glock in EX so that all other nodes
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* get a demote request and act on it. We don't really want the
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* lock in EX, so we send a "try" lock with 1CB to produce a callback.
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*/
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fs_warn(sdp, "Requesting recovery of jid %d.\n",
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sdp->sd_lockstruct.ls_jid);
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gfs2_holder_reinit(LM_ST_EXCLUSIVE,
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LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | GL_NOPID,
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&sdp->sd_live_gh);
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msleep(GL_GLOCK_MAX_HOLD);
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/*
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* This will likely fail in a cluster, but succeed standalone:
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*/
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ret = gfs2_glock_nq(&sdp->sd_live_gh);
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/*
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* If we actually got the "live" lock in EX mode, there are no other
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* nodes available to replay our journal. So we try to replay it
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* ourselves. We hold the "live" glock to prevent other mounters
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* during recovery, then just dequeue it and reacquire it in our
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* normal SH mode. Just in case the problem that caused us to
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* withdraw prevents us from recovering our journal (e.g. io errors
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* and such) we still check if the journal is clean before proceeding
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* but we may wait forever until another mounter does the recovery.
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*/
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if (ret == 0) {
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fs_warn(sdp, "No other mounters found. Trying to recover our "
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"own journal jid %d.\n", sdp->sd_lockstruct.ls_jid);
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if (gfs2_recover_journal(sdp->sd_jdesc, 1))
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fs_warn(sdp, "Unable to recover our journal jid %d.\n",
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sdp->sd_lockstruct.ls_jid);
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gfs2_glock_dq_wait(&sdp->sd_live_gh);
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gfs2_holder_reinit(LM_ST_SHARED,
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LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
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&sdp->sd_live_gh);
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gfs2_glock_nq(&sdp->sd_live_gh);
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}
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gfs2_glock_queue_put(live_gl); /* drop extra reference we acquired */
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clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
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/*
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* At this point our journal is evicted, so we need to get a new inode
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* for it. Once done, we need to call gfs2_find_jhead which
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* calls gfs2_map_journal_extents to map it for us again.
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*
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* Note that we don't really want it to look up a FREE block. The
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* GFS2_BLKST_FREE simply overrides a block check in gfs2_inode_lookup
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* which would otherwise fail because it requires grabbing an rgrp
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* glock, which would fail with -EIO because we're withdrawing.
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*/
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inode = gfs2_inode_lookup(sdp->sd_vfs, DT_UNKNOWN,
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sdp->sd_jdesc->jd_no_addr, no_formal_ino,
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GFS2_BLKST_FREE);
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if (IS_ERR(inode)) {
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fs_warn(sdp, "Reprocessing of jid %d failed with %ld.\n",
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sdp->sd_lockstruct.ls_jid, PTR_ERR(inode));
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goto skip_recovery;
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}
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sdp->sd_jdesc->jd_inode = inode;
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d_mark_dontcache(inode);
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/*
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* Now wait until recovery is complete.
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*/
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for (tries = 0; tries < 10; tries++) {
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ret = check_journal_clean(sdp, sdp->sd_jdesc, false);
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if (!ret)
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break;
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msleep(HZ);
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fs_warn(sdp, "Waiting for journal recovery jid %d.\n",
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sdp->sd_lockstruct.ls_jid);
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}
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skip_recovery:
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if (!ret)
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fs_warn(sdp, "Journal recovery complete for jid %d.\n",
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sdp->sd_lockstruct.ls_jid);
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else
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fs_warn(sdp, "Journal recovery skipped for jid %d until next "
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"mount.\n", sdp->sd_lockstruct.ls_jid);
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fs_warn(sdp, "Glock dequeues delayed: %lu\n", sdp->sd_glock_dqs_held);
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sdp->sd_glock_dqs_held = 0;
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wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY);
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}
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void gfs2_lm(struct gfs2_sbd *sdp, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
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test_bit(SDF_WITHDRAWN, &sdp->sd_flags))
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return;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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fs_err(sdp, "%pV", &vaf);
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va_end(args);
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}
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int gfs2_withdraw(struct gfs2_sbd *sdp)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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const struct lm_lockops *lm = ls->ls_ops;
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if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
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unsigned long old = READ_ONCE(sdp->sd_flags), new;
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do {
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if (old & BIT(SDF_WITHDRAWN)) {
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wait_on_bit(&sdp->sd_flags,
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SDF_WITHDRAW_IN_PROG,
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TASK_UNINTERRUPTIBLE);
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return -1;
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}
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new = old | BIT(SDF_WITHDRAWN) | BIT(SDF_WITHDRAW_IN_PROG);
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} while (unlikely(!try_cmpxchg(&sdp->sd_flags, &old, new)));
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fs_err(sdp, "about to withdraw this file system\n");
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BUG_ON(sdp->sd_args.ar_debug);
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signal_our_withdraw(sdp);
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kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
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if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
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wait_for_completion(&sdp->sd_wdack);
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if (lm->lm_unmount) {
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fs_err(sdp, "telling LM to unmount\n");
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lm->lm_unmount(sdp);
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}
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set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags);
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fs_err(sdp, "File system withdrawn\n");
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dump_stack();
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clear_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
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smp_mb__after_atomic();
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wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG);
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}
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if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
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panic("GFS2: fsid=%s: panic requested\n", sdp->sd_fsname);
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return -1;
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}
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/*
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* gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
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*/
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void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
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const char *function, char *file, unsigned int line,
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bool delayed)
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{
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if (gfs2_withdrawn(sdp))
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return;
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fs_err(sdp,
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"fatal: assertion \"%s\" failed\n"
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" function = %s, file = %s, line = %u\n",
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assertion, function, file, line);
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/*
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* If errors=panic was specified on mount, it won't help to delay the
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* withdraw.
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*/
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if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
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delayed = false;
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if (delayed)
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gfs2_withdraw_delayed(sdp);
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else
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gfs2_withdraw(sdp);
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dump_stack();
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}
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/*
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* gfs2_assert_warn_i - Print a message to the console if @assertion is false
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*/
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void gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
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const char *function, char *file, unsigned int line)
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{
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if (time_before(jiffies,
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sdp->sd_last_warning +
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gfs2_tune_get(sdp, gt_complain_secs) * HZ))
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return;
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if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
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fs_warn(sdp, "warning: assertion \"%s\" failed at function = %s, file = %s, line = %u\n",
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assertion, function, file, line);
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if (sdp->sd_args.ar_debug)
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BUG();
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else
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dump_stack();
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if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
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panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname, assertion,
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sdp->sd_fsname, function, file, line);
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sdp->sd_last_warning = jiffies;
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}
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/*
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* gfs2_consist_i - Flag a filesystem consistency error and withdraw
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*/
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void gfs2_consist_i(struct gfs2_sbd *sdp, const char *function,
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char *file, unsigned int line)
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{
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gfs2_lm(sdp,
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"fatal: filesystem consistency error - function = %s, file = %s, line = %u\n",
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function, file, line);
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gfs2_withdraw(sdp);
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}
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|
/*
|
|
* gfs2_consist_inode_i - Flag an inode consistency error and withdraw
|
|
*/
|
|
|
|
void gfs2_consist_inode_i(struct gfs2_inode *ip,
|
|
const char *function, char *file, unsigned int line)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
|
|
gfs2_lm(sdp,
|
|
"fatal: filesystem consistency error\n"
|
|
" inode = %llu %llu\n"
|
|
" function = %s, file = %s, line = %u\n",
|
|
(unsigned long long)ip->i_no_formal_ino,
|
|
(unsigned long long)ip->i_no_addr,
|
|
function, file, line);
|
|
gfs2_dump_glock(NULL, ip->i_gl, 1);
|
|
gfs2_withdraw(sdp);
|
|
}
|
|
|
|
/*
|
|
* gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
|
|
*/
|
|
|
|
void gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd,
|
|
const char *function, char *file, unsigned int line)
|
|
{
|
|
struct gfs2_sbd *sdp = rgd->rd_sbd;
|
|
char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
|
|
|
|
sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
|
|
gfs2_rgrp_dump(NULL, rgd, fs_id_buf);
|
|
gfs2_lm(sdp,
|
|
"fatal: filesystem consistency error\n"
|
|
" RG = %llu\n"
|
|
" function = %s, file = %s, line = %u\n",
|
|
(unsigned long long)rgd->rd_addr,
|
|
function, file, line);
|
|
gfs2_dump_glock(NULL, rgd->rd_gl, 1);
|
|
gfs2_withdraw(sdp);
|
|
}
|
|
|
|
/*
|
|
* gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
|
|
* Returns: -1 if this call withdrew the machine,
|
|
* -2 if it was already withdrawn
|
|
*/
|
|
|
|
int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
|
|
const char *type, const char *function, char *file,
|
|
unsigned int line)
|
|
{
|
|
int me;
|
|
|
|
gfs2_lm(sdp,
|
|
"fatal: invalid metadata block\n"
|
|
" bh = %llu (%s)\n"
|
|
" function = %s, file = %s, line = %u\n",
|
|
(unsigned long long)bh->b_blocknr, type,
|
|
function, file, line);
|
|
me = gfs2_withdraw(sdp);
|
|
return (me) ? -1 : -2;
|
|
}
|
|
|
|
/*
|
|
* gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
|
|
* Returns: -1 if this call withdrew the machine,
|
|
* -2 if it was already withdrawn
|
|
*/
|
|
|
|
int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
|
|
u16 type, u16 t, const char *function,
|
|
char *file, unsigned int line)
|
|
{
|
|
int me;
|
|
|
|
gfs2_lm(sdp,
|
|
"fatal: invalid metadata block\n"
|
|
" bh = %llu (type: exp=%u, found=%u)\n"
|
|
" function = %s, file = %s, line = %u\n",
|
|
(unsigned long long)bh->b_blocknr, type, t,
|
|
function, file, line);
|
|
me = gfs2_withdraw(sdp);
|
|
return (me) ? -1 : -2;
|
|
}
|
|
|
|
/*
|
|
* gfs2_io_error_i - Flag an I/O error and withdraw
|
|
* Returns: -1 if this call withdrew the machine,
|
|
* 0 if it was already withdrawn
|
|
*/
|
|
|
|
int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
|
|
unsigned int line)
|
|
{
|
|
gfs2_lm(sdp,
|
|
"fatal: I/O error\n"
|
|
" function = %s, file = %s, line = %u\n",
|
|
function, file, line);
|
|
return gfs2_withdraw(sdp);
|
|
}
|
|
|
|
/*
|
|
* gfs2_io_error_bh_i - Flag a buffer I/O error
|
|
* @withdraw: withdraw the filesystem
|
|
*/
|
|
|
|
void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
|
|
const char *function, char *file, unsigned int line,
|
|
bool withdraw)
|
|
{
|
|
if (gfs2_withdrawn(sdp))
|
|
return;
|
|
|
|
fs_err(sdp, "fatal: I/O error\n"
|
|
" block = %llu\n"
|
|
" function = %s, file = %s, line = %u\n",
|
|
(unsigned long long)bh->b_blocknr, function, file, line);
|
|
if (withdraw)
|
|
gfs2_withdraw(sdp);
|
|
}
|
|
|