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174cd4b1e5
Fix up affected files that include this signal functionality via sched.h. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
1338 lines
39 KiB
C
1338 lines
39 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright 2004-2011 Red Hat, Inc.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/fs.h>
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#include <linux/dlm.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/sched/signal.h>
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#include "incore.h"
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#include "glock.h"
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#include "util.h"
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#include "sys.h"
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#include "trace_gfs2.h"
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extern struct workqueue_struct *gfs2_control_wq;
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/**
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* gfs2_update_stats - Update time based stats
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* @mv: Pointer to mean/variance structure to update
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* @sample: New data to include
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*
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* @delta is the difference between the current rtt sample and the
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* running average srtt. We add 1/8 of that to the srtt in order to
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* update the current srtt estimate. The variance estimate is a bit
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* more complicated. We subtract the abs value of the @delta from
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* the current variance estimate and add 1/4 of that to the running
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* total.
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*
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* Note that the index points at the array entry containing the smoothed
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* mean value, and the variance is always in the following entry
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*
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* Reference: TCP/IP Illustrated, vol 2, p. 831,832
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* All times are in units of integer nanoseconds. Unlike the TCP/IP case,
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* they are not scaled fixed point.
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*/
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static inline void gfs2_update_stats(struct gfs2_lkstats *s, unsigned index,
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s64 sample)
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{
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s64 delta = sample - s->stats[index];
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s->stats[index] += (delta >> 3);
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index++;
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s->stats[index] += ((abs(delta) - s->stats[index]) >> 2);
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}
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/**
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* gfs2_update_reply_times - Update locking statistics
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* @gl: The glock to update
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*
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* This assumes that gl->gl_dstamp has been set earlier.
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*
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* The rtt (lock round trip time) is an estimate of the time
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* taken to perform a dlm lock request. We update it on each
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* reply from the dlm.
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*
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* The blocking flag is set on the glock for all dlm requests
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* which may potentially block due to lock requests from other nodes.
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* DLM requests where the current lock state is exclusive, the
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* requested state is null (or unlocked) or where the TRY or
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* TRY_1CB flags are set are classified as non-blocking. All
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* other DLM requests are counted as (potentially) blocking.
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*/
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static inline void gfs2_update_reply_times(struct gfs2_glock *gl)
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{
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struct gfs2_pcpu_lkstats *lks;
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const unsigned gltype = gl->gl_name.ln_type;
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unsigned index = test_bit(GLF_BLOCKING, &gl->gl_flags) ?
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GFS2_LKS_SRTTB : GFS2_LKS_SRTT;
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s64 rtt;
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preempt_disable();
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rtt = ktime_to_ns(ktime_sub(ktime_get_real(), gl->gl_dstamp));
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lks = this_cpu_ptr(gl->gl_name.ln_sbd->sd_lkstats);
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gfs2_update_stats(&gl->gl_stats, index, rtt); /* Local */
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gfs2_update_stats(&lks->lkstats[gltype], index, rtt); /* Global */
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preempt_enable();
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trace_gfs2_glock_lock_time(gl, rtt);
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}
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/**
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* gfs2_update_request_times - Update locking statistics
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* @gl: The glock to update
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*
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* The irt (lock inter-request times) measures the average time
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* between requests to the dlm. It is updated immediately before
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* each dlm call.
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*/
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static inline void gfs2_update_request_times(struct gfs2_glock *gl)
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{
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struct gfs2_pcpu_lkstats *lks;
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const unsigned gltype = gl->gl_name.ln_type;
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ktime_t dstamp;
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s64 irt;
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preempt_disable();
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dstamp = gl->gl_dstamp;
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gl->gl_dstamp = ktime_get_real();
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irt = ktime_to_ns(ktime_sub(gl->gl_dstamp, dstamp));
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lks = this_cpu_ptr(gl->gl_name.ln_sbd->sd_lkstats);
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gfs2_update_stats(&gl->gl_stats, GFS2_LKS_SIRT, irt); /* Local */
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gfs2_update_stats(&lks->lkstats[gltype], GFS2_LKS_SIRT, irt); /* Global */
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preempt_enable();
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}
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static void gdlm_ast(void *arg)
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{
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struct gfs2_glock *gl = arg;
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unsigned ret = gl->gl_state;
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gfs2_update_reply_times(gl);
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BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED);
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if ((gl->gl_lksb.sb_flags & DLM_SBF_VALNOTVALID) && gl->gl_lksb.sb_lvbptr)
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memset(gl->gl_lksb.sb_lvbptr, 0, GDLM_LVB_SIZE);
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switch (gl->gl_lksb.sb_status) {
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case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */
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gfs2_glock_free(gl);
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return;
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case -DLM_ECANCEL: /* Cancel while getting lock */
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ret |= LM_OUT_CANCELED;
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goto out;
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case -EAGAIN: /* Try lock fails */
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case -EDEADLK: /* Deadlock detected */
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goto out;
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case -ETIMEDOUT: /* Canceled due to timeout */
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ret |= LM_OUT_ERROR;
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goto out;
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case 0: /* Success */
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break;
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default: /* Something unexpected */
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BUG();
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}
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ret = gl->gl_req;
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if (gl->gl_lksb.sb_flags & DLM_SBF_ALTMODE) {
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if (gl->gl_req == LM_ST_SHARED)
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ret = LM_ST_DEFERRED;
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else if (gl->gl_req == LM_ST_DEFERRED)
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ret = LM_ST_SHARED;
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else
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BUG();
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}
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set_bit(GLF_INITIAL, &gl->gl_flags);
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gfs2_glock_complete(gl, ret);
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return;
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out:
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if (!test_bit(GLF_INITIAL, &gl->gl_flags))
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gl->gl_lksb.sb_lkid = 0;
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gfs2_glock_complete(gl, ret);
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}
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static void gdlm_bast(void *arg, int mode)
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{
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struct gfs2_glock *gl = arg;
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switch (mode) {
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case DLM_LOCK_EX:
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gfs2_glock_cb(gl, LM_ST_UNLOCKED);
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break;
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case DLM_LOCK_CW:
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gfs2_glock_cb(gl, LM_ST_DEFERRED);
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break;
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case DLM_LOCK_PR:
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gfs2_glock_cb(gl, LM_ST_SHARED);
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break;
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default:
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pr_err("unknown bast mode %d\n", mode);
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BUG();
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}
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}
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/* convert gfs lock-state to dlm lock-mode */
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static int make_mode(const unsigned int lmstate)
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{
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switch (lmstate) {
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case LM_ST_UNLOCKED:
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return DLM_LOCK_NL;
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case LM_ST_EXCLUSIVE:
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return DLM_LOCK_EX;
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case LM_ST_DEFERRED:
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return DLM_LOCK_CW;
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case LM_ST_SHARED:
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return DLM_LOCK_PR;
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}
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pr_err("unknown LM state %d\n", lmstate);
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BUG();
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return -1;
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}
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static u32 make_flags(struct gfs2_glock *gl, const unsigned int gfs_flags,
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const int req)
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{
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u32 lkf = 0;
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if (gl->gl_lksb.sb_lvbptr)
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lkf |= DLM_LKF_VALBLK;
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if (gfs_flags & LM_FLAG_TRY)
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lkf |= DLM_LKF_NOQUEUE;
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if (gfs_flags & LM_FLAG_TRY_1CB) {
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lkf |= DLM_LKF_NOQUEUE;
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lkf |= DLM_LKF_NOQUEUEBAST;
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}
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if (gfs_flags & LM_FLAG_PRIORITY) {
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lkf |= DLM_LKF_NOORDER;
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lkf |= DLM_LKF_HEADQUE;
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}
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if (gfs_flags & LM_FLAG_ANY) {
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if (req == DLM_LOCK_PR)
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lkf |= DLM_LKF_ALTCW;
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else if (req == DLM_LOCK_CW)
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lkf |= DLM_LKF_ALTPR;
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else
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BUG();
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}
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if (gl->gl_lksb.sb_lkid != 0) {
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lkf |= DLM_LKF_CONVERT;
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if (test_bit(GLF_BLOCKING, &gl->gl_flags))
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lkf |= DLM_LKF_QUECVT;
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}
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return lkf;
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}
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static void gfs2_reverse_hex(char *c, u64 value)
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{
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*c = '0';
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while (value) {
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*c-- = hex_asc[value & 0x0f];
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value >>= 4;
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}
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}
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static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state,
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unsigned int flags)
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{
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struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
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int req;
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u32 lkf;
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char strname[GDLM_STRNAME_BYTES] = "";
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req = make_mode(req_state);
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lkf = make_flags(gl, flags, req);
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gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT);
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gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT);
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if (gl->gl_lksb.sb_lkid) {
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gfs2_update_request_times(gl);
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} else {
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memset(strname, ' ', GDLM_STRNAME_BYTES - 1);
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strname[GDLM_STRNAME_BYTES - 1] = '\0';
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gfs2_reverse_hex(strname + 7, gl->gl_name.ln_type);
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gfs2_reverse_hex(strname + 23, gl->gl_name.ln_number);
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gl->gl_dstamp = ktime_get_real();
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}
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/*
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* Submit the actual lock request.
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*/
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return dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, strname,
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GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
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}
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static void gdlm_put_lock(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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int lvb_needs_unlock = 0;
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int error;
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if (gl->gl_lksb.sb_lkid == 0) {
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gfs2_glock_free(gl);
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return;
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}
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clear_bit(GLF_BLOCKING, &gl->gl_flags);
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gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT);
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gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT);
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gfs2_update_request_times(gl);
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/* don't want to skip dlm_unlock writing the lvb when lock is ex */
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if (gl->gl_lksb.sb_lvbptr && (gl->gl_state == LM_ST_EXCLUSIVE))
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lvb_needs_unlock = 1;
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if (test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags) &&
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!lvb_needs_unlock) {
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gfs2_glock_free(gl);
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return;
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}
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error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK,
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NULL, gl);
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if (error) {
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pr_err("gdlm_unlock %x,%llx err=%d\n",
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gl->gl_name.ln_type,
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(unsigned long long)gl->gl_name.ln_number, error);
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return;
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}
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}
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static void gdlm_cancel(struct gfs2_glock *gl)
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{
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struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
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dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl);
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}
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/*
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* dlm/gfs2 recovery coordination using dlm_recover callbacks
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*
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* 1. dlm_controld sees lockspace members change
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* 2. dlm_controld blocks dlm-kernel locking activity
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* 3. dlm_controld within dlm-kernel notifies gfs2 (recover_prep)
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* 4. dlm_controld starts and finishes its own user level recovery
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* 5. dlm_controld starts dlm-kernel dlm_recoverd to do kernel recovery
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* 6. dlm_recoverd notifies gfs2 of failed nodes (recover_slot)
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* 7. dlm_recoverd does its own lock recovery
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* 8. dlm_recoverd unblocks dlm-kernel locking activity
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* 9. dlm_recoverd notifies gfs2 when done (recover_done with new generation)
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* 10. gfs2_control updates control_lock lvb with new generation and jid bits
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* 11. gfs2_control enqueues journals for gfs2_recover to recover (maybe none)
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* 12. gfs2_recover dequeues and recovers journals of failed nodes
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* 13. gfs2_recover provides recovery results to gfs2_control (recovery_result)
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* 14. gfs2_control updates control_lock lvb jid bits for recovered journals
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* 15. gfs2_control unblocks normal locking when all journals are recovered
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*
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* - failures during recovery
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*
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* recover_prep() may set BLOCK_LOCKS (step 3) again before gfs2_control
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* clears BLOCK_LOCKS (step 15), e.g. another node fails while still
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* recovering for a prior failure. gfs2_control needs a way to detect
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* this so it can leave BLOCK_LOCKS set in step 15. This is managed using
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* the recover_block and recover_start values.
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*
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* recover_done() provides a new lockspace generation number each time it
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* is called (step 9). This generation number is saved as recover_start.
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* When recover_prep() is called, it sets BLOCK_LOCKS and sets
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* recover_block = recover_start. So, while recover_block is equal to
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* recover_start, BLOCK_LOCKS should remain set. (recover_spin must
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* be held around the BLOCK_LOCKS/recover_block/recover_start logic.)
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*
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* - more specific gfs2 steps in sequence above
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*
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* 3. recover_prep sets BLOCK_LOCKS and sets recover_block = recover_start
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* 6. recover_slot records any failed jids (maybe none)
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* 9. recover_done sets recover_start = new generation number
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* 10. gfs2_control sets control_lock lvb = new gen + bits for failed jids
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* 12. gfs2_recover does journal recoveries for failed jids identified above
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* 14. gfs2_control clears control_lock lvb bits for recovered jids
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* 15. gfs2_control checks if recover_block == recover_start (step 3 occured
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* again) then do nothing, otherwise if recover_start > recover_block
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* then clear BLOCK_LOCKS.
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*
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* - parallel recovery steps across all nodes
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*
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* All nodes attempt to update the control_lock lvb with the new generation
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* number and jid bits, but only the first to get the control_lock EX will
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* do so; others will see that it's already done (lvb already contains new
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* generation number.)
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*
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* . All nodes get the same recover_prep/recover_slot/recover_done callbacks
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* . All nodes attempt to set control_lock lvb gen + bits for the new gen
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* . One node gets control_lock first and writes the lvb, others see it's done
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* . All nodes attempt to recover jids for which they see control_lock bits set
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* . One node succeeds for a jid, and that one clears the jid bit in the lvb
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* . All nodes will eventually see all lvb bits clear and unblock locks
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*
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* - is there a problem with clearing an lvb bit that should be set
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* and missing a journal recovery?
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*
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* 1. jid fails
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* 2. lvb bit set for step 1
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* 3. jid recovered for step 1
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* 4. jid taken again (new mount)
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* 5. jid fails (for step 4)
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* 6. lvb bit set for step 5 (will already be set)
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* 7. lvb bit cleared for step 3
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*
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* This is not a problem because the failure in step 5 does not
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* require recovery, because the mount in step 4 could not have
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* progressed far enough to unblock locks and access the fs. The
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* control_mount() function waits for all recoveries to be complete
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* for the latest lockspace generation before ever unblocking locks
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* and returning. The mount in step 4 waits until the recovery in
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* step 1 is done.
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*
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* - special case of first mounter: first node to mount the fs
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*
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* The first node to mount a gfs2 fs needs to check all the journals
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* and recover any that need recovery before other nodes are allowed
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* to mount the fs. (Others may begin mounting, but they must wait
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* for the first mounter to be done before taking locks on the fs
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* or accessing the fs.) This has two parts:
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*
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* 1. The mounted_lock tells a node it's the first to mount the fs.
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* Each node holds the mounted_lock in PR while it's mounted.
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* Each node tries to acquire the mounted_lock in EX when it mounts.
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* If a node is granted the mounted_lock EX it means there are no
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* other mounted nodes (no PR locks exist), and it is the first mounter.
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* The mounted_lock is demoted to PR when first recovery is done, so
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* others will fail to get an EX lock, but will get a PR lock.
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*
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* 2. The control_lock blocks others in control_mount() while the first
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* mounter is doing first mount recovery of all journals.
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* A mounting node needs to acquire control_lock in EX mode before
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* it can proceed. The first mounter holds control_lock in EX while doing
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* the first mount recovery, blocking mounts from other nodes, then demotes
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* control_lock to NL when it's done (others_may_mount/first_done),
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* allowing other nodes to continue mounting.
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*
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* first mounter:
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* control_lock EX/NOQUEUE success
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* mounted_lock EX/NOQUEUE success (no other PR, so no other mounters)
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* set first=1
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* do first mounter recovery
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* mounted_lock EX->PR
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* control_lock EX->NL, write lvb generation
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*
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* other mounter:
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* control_lock EX/NOQUEUE success (if fail -EAGAIN, retry)
|
|
* mounted_lock EX/NOQUEUE fail -EAGAIN (expected due to other mounters PR)
|
|
* mounted_lock PR/NOQUEUE success
|
|
* read lvb generation
|
|
* control_lock EX->NL
|
|
* set first=0
|
|
*
|
|
* - mount during recovery
|
|
*
|
|
* If a node mounts while others are doing recovery (not first mounter),
|
|
* the mounting node will get its initial recover_done() callback without
|
|
* having seen any previous failures/callbacks.
|
|
*
|
|
* It must wait for all recoveries preceding its mount to be finished
|
|
* before it unblocks locks. It does this by repeating the "other mounter"
|
|
* steps above until the lvb generation number is >= its mount generation
|
|
* number (from initial recover_done) and all lvb bits are clear.
|
|
*
|
|
* - control_lock lvb format
|
|
*
|
|
* 4 bytes generation number: the latest dlm lockspace generation number
|
|
* from recover_done callback. Indicates the jid bitmap has been updated
|
|
* to reflect all slot failures through that generation.
|
|
* 4 bytes unused.
|
|
* GDLM_LVB_SIZE-8 bytes of jid bit map. If bit N is set, it indicates
|
|
* that jid N needs recovery.
|
|
*/
|
|
|
|
#define JID_BITMAP_OFFSET 8 /* 4 byte generation number + 4 byte unused */
|
|
|
|
static void control_lvb_read(struct lm_lockstruct *ls, uint32_t *lvb_gen,
|
|
char *lvb_bits)
|
|
{
|
|
__le32 gen;
|
|
memcpy(lvb_bits, ls->ls_control_lvb, GDLM_LVB_SIZE);
|
|
memcpy(&gen, lvb_bits, sizeof(__le32));
|
|
*lvb_gen = le32_to_cpu(gen);
|
|
}
|
|
|
|
static void control_lvb_write(struct lm_lockstruct *ls, uint32_t lvb_gen,
|
|
char *lvb_bits)
|
|
{
|
|
__le32 gen;
|
|
memcpy(ls->ls_control_lvb, lvb_bits, GDLM_LVB_SIZE);
|
|
gen = cpu_to_le32(lvb_gen);
|
|
memcpy(ls->ls_control_lvb, &gen, sizeof(__le32));
|
|
}
|
|
|
|
static int all_jid_bits_clear(char *lvb)
|
|
{
|
|
return !memchr_inv(lvb + JID_BITMAP_OFFSET, 0,
|
|
GDLM_LVB_SIZE - JID_BITMAP_OFFSET);
|
|
}
|
|
|
|
static void sync_wait_cb(void *arg)
|
|
{
|
|
struct lm_lockstruct *ls = arg;
|
|
complete(&ls->ls_sync_wait);
|
|
}
|
|
|
|
static int sync_unlock(struct gfs2_sbd *sdp, struct dlm_lksb *lksb, char *name)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
int error;
|
|
|
|
error = dlm_unlock(ls->ls_dlm, lksb->sb_lkid, 0, lksb, ls);
|
|
if (error) {
|
|
fs_err(sdp, "%s lkid %x error %d\n",
|
|
name, lksb->sb_lkid, error);
|
|
return error;
|
|
}
|
|
|
|
wait_for_completion(&ls->ls_sync_wait);
|
|
|
|
if (lksb->sb_status != -DLM_EUNLOCK) {
|
|
fs_err(sdp, "%s lkid %x status %d\n",
|
|
name, lksb->sb_lkid, lksb->sb_status);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int sync_lock(struct gfs2_sbd *sdp, int mode, uint32_t flags,
|
|
unsigned int num, struct dlm_lksb *lksb, char *name)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
char strname[GDLM_STRNAME_BYTES];
|
|
int error, status;
|
|
|
|
memset(strname, 0, GDLM_STRNAME_BYTES);
|
|
snprintf(strname, GDLM_STRNAME_BYTES, "%8x%16x", LM_TYPE_NONDISK, num);
|
|
|
|
error = dlm_lock(ls->ls_dlm, mode, lksb, flags,
|
|
strname, GDLM_STRNAME_BYTES - 1,
|
|
0, sync_wait_cb, ls, NULL);
|
|
if (error) {
|
|
fs_err(sdp, "%s lkid %x flags %x mode %d error %d\n",
|
|
name, lksb->sb_lkid, flags, mode, error);
|
|
return error;
|
|
}
|
|
|
|
wait_for_completion(&ls->ls_sync_wait);
|
|
|
|
status = lksb->sb_status;
|
|
|
|
if (status && status != -EAGAIN) {
|
|
fs_err(sdp, "%s lkid %x flags %x mode %d status %d\n",
|
|
name, lksb->sb_lkid, flags, mode, status);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static int mounted_unlock(struct gfs2_sbd *sdp)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
return sync_unlock(sdp, &ls->ls_mounted_lksb, "mounted_lock");
|
|
}
|
|
|
|
static int mounted_lock(struct gfs2_sbd *sdp, int mode, uint32_t flags)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
return sync_lock(sdp, mode, flags, GFS2_MOUNTED_LOCK,
|
|
&ls->ls_mounted_lksb, "mounted_lock");
|
|
}
|
|
|
|
static int control_unlock(struct gfs2_sbd *sdp)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
return sync_unlock(sdp, &ls->ls_control_lksb, "control_lock");
|
|
}
|
|
|
|
static int control_lock(struct gfs2_sbd *sdp, int mode, uint32_t flags)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
return sync_lock(sdp, mode, flags, GFS2_CONTROL_LOCK,
|
|
&ls->ls_control_lksb, "control_lock");
|
|
}
|
|
|
|
static void gfs2_control_func(struct work_struct *work)
|
|
{
|
|
struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_control_work.work);
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
uint32_t block_gen, start_gen, lvb_gen, flags;
|
|
int recover_set = 0;
|
|
int write_lvb = 0;
|
|
int recover_size;
|
|
int i, error;
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
/*
|
|
* No MOUNT_DONE means we're still mounting; control_mount()
|
|
* will set this flag, after which this thread will take over
|
|
* all further clearing of BLOCK_LOCKS.
|
|
*
|
|
* FIRST_MOUNT means this node is doing first mounter recovery,
|
|
* for which recovery control is handled by
|
|
* control_mount()/control_first_done(), not this thread.
|
|
*/
|
|
if (!test_bit(DFL_MOUNT_DONE, &ls->ls_recover_flags) ||
|
|
test_bit(DFL_FIRST_MOUNT, &ls->ls_recover_flags)) {
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
return;
|
|
}
|
|
block_gen = ls->ls_recover_block;
|
|
start_gen = ls->ls_recover_start;
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
|
|
/*
|
|
* Equal block_gen and start_gen implies we are between
|
|
* recover_prep and recover_done callbacks, which means
|
|
* dlm recovery is in progress and dlm locking is blocked.
|
|
* There's no point trying to do any work until recover_done.
|
|
*/
|
|
|
|
if (block_gen == start_gen)
|
|
return;
|
|
|
|
/*
|
|
* Propagate recover_submit[] and recover_result[] to lvb:
|
|
* dlm_recoverd adds to recover_submit[] jids needing recovery
|
|
* gfs2_recover adds to recover_result[] journal recovery results
|
|
*
|
|
* set lvb bit for jids in recover_submit[] if the lvb has not
|
|
* yet been updated for the generation of the failure
|
|
*
|
|
* clear lvb bit for jids in recover_result[] if the result of
|
|
* the journal recovery is SUCCESS
|
|
*/
|
|
|
|
error = control_lock(sdp, DLM_LOCK_EX, DLM_LKF_CONVERT|DLM_LKF_VALBLK);
|
|
if (error) {
|
|
fs_err(sdp, "control lock EX error %d\n", error);
|
|
return;
|
|
}
|
|
|
|
control_lvb_read(ls, &lvb_gen, ls->ls_lvb_bits);
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
if (block_gen != ls->ls_recover_block ||
|
|
start_gen != ls->ls_recover_start) {
|
|
fs_info(sdp, "recover generation %u block1 %u %u\n",
|
|
start_gen, block_gen, ls->ls_recover_block);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
control_lock(sdp, DLM_LOCK_NL, DLM_LKF_CONVERT);
|
|
return;
|
|
}
|
|
|
|
recover_size = ls->ls_recover_size;
|
|
|
|
if (lvb_gen <= start_gen) {
|
|
/*
|
|
* Clear lvb bits for jids we've successfully recovered.
|
|
* Because all nodes attempt to recover failed journals,
|
|
* a journal can be recovered multiple times successfully
|
|
* in succession. Only the first will really do recovery,
|
|
* the others find it clean, but still report a successful
|
|
* recovery. So, another node may have already recovered
|
|
* the jid and cleared the lvb bit for it.
|
|
*/
|
|
for (i = 0; i < recover_size; i++) {
|
|
if (ls->ls_recover_result[i] != LM_RD_SUCCESS)
|
|
continue;
|
|
|
|
ls->ls_recover_result[i] = 0;
|
|
|
|
if (!test_bit_le(i, ls->ls_lvb_bits + JID_BITMAP_OFFSET))
|
|
continue;
|
|
|
|
__clear_bit_le(i, ls->ls_lvb_bits + JID_BITMAP_OFFSET);
|
|
write_lvb = 1;
|
|
}
|
|
}
|
|
|
|
if (lvb_gen == start_gen) {
|
|
/*
|
|
* Failed slots before start_gen are already set in lvb.
|
|
*/
|
|
for (i = 0; i < recover_size; i++) {
|
|
if (!ls->ls_recover_submit[i])
|
|
continue;
|
|
if (ls->ls_recover_submit[i] < lvb_gen)
|
|
ls->ls_recover_submit[i] = 0;
|
|
}
|
|
} else if (lvb_gen < start_gen) {
|
|
/*
|
|
* Failed slots before start_gen are not yet set in lvb.
|
|
*/
|
|
for (i = 0; i < recover_size; i++) {
|
|
if (!ls->ls_recover_submit[i])
|
|
continue;
|
|
if (ls->ls_recover_submit[i] < start_gen) {
|
|
ls->ls_recover_submit[i] = 0;
|
|
__set_bit_le(i, ls->ls_lvb_bits + JID_BITMAP_OFFSET);
|
|
}
|
|
}
|
|
/* even if there are no bits to set, we need to write the
|
|
latest generation to the lvb */
|
|
write_lvb = 1;
|
|
} else {
|
|
/*
|
|
* we should be getting a recover_done() for lvb_gen soon
|
|
*/
|
|
}
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
|
|
if (write_lvb) {
|
|
control_lvb_write(ls, start_gen, ls->ls_lvb_bits);
|
|
flags = DLM_LKF_CONVERT | DLM_LKF_VALBLK;
|
|
} else {
|
|
flags = DLM_LKF_CONVERT;
|
|
}
|
|
|
|
error = control_lock(sdp, DLM_LOCK_NL, flags);
|
|
if (error) {
|
|
fs_err(sdp, "control lock NL error %d\n", error);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Everyone will see jid bits set in the lvb, run gfs2_recover_set(),
|
|
* and clear a jid bit in the lvb if the recovery is a success.
|
|
* Eventually all journals will be recovered, all jid bits will
|
|
* be cleared in the lvb, and everyone will clear BLOCK_LOCKS.
|
|
*/
|
|
|
|
for (i = 0; i < recover_size; i++) {
|
|
if (test_bit_le(i, ls->ls_lvb_bits + JID_BITMAP_OFFSET)) {
|
|
fs_info(sdp, "recover generation %u jid %d\n",
|
|
start_gen, i);
|
|
gfs2_recover_set(sdp, i);
|
|
recover_set++;
|
|
}
|
|
}
|
|
if (recover_set)
|
|
return;
|
|
|
|
/*
|
|
* No more jid bits set in lvb, all recovery is done, unblock locks
|
|
* (unless a new recover_prep callback has occured blocking locks
|
|
* again while working above)
|
|
*/
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
if (ls->ls_recover_block == block_gen &&
|
|
ls->ls_recover_start == start_gen) {
|
|
clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
fs_info(sdp, "recover generation %u done\n", start_gen);
|
|
gfs2_glock_thaw(sdp);
|
|
} else {
|
|
fs_info(sdp, "recover generation %u block2 %u %u\n",
|
|
start_gen, block_gen, ls->ls_recover_block);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
}
|
|
}
|
|
|
|
static int control_mount(struct gfs2_sbd *sdp)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
uint32_t start_gen, block_gen, mount_gen, lvb_gen;
|
|
int mounted_mode;
|
|
int retries = 0;
|
|
int error;
|
|
|
|
memset(&ls->ls_mounted_lksb, 0, sizeof(struct dlm_lksb));
|
|
memset(&ls->ls_control_lksb, 0, sizeof(struct dlm_lksb));
|
|
memset(&ls->ls_control_lvb, 0, GDLM_LVB_SIZE);
|
|
ls->ls_control_lksb.sb_lvbptr = ls->ls_control_lvb;
|
|
init_completion(&ls->ls_sync_wait);
|
|
|
|
set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
|
|
|
|
error = control_lock(sdp, DLM_LOCK_NL, DLM_LKF_VALBLK);
|
|
if (error) {
|
|
fs_err(sdp, "control_mount control_lock NL error %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
error = mounted_lock(sdp, DLM_LOCK_NL, 0);
|
|
if (error) {
|
|
fs_err(sdp, "control_mount mounted_lock NL error %d\n", error);
|
|
control_unlock(sdp);
|
|
return error;
|
|
}
|
|
mounted_mode = DLM_LOCK_NL;
|
|
|
|
restart:
|
|
if (retries++ && signal_pending(current)) {
|
|
error = -EINTR;
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* We always start with both locks in NL. control_lock is
|
|
* demoted to NL below so we don't need to do it here.
|
|
*/
|
|
|
|
if (mounted_mode != DLM_LOCK_NL) {
|
|
error = mounted_lock(sdp, DLM_LOCK_NL, DLM_LKF_CONVERT);
|
|
if (error)
|
|
goto fail;
|
|
mounted_mode = DLM_LOCK_NL;
|
|
}
|
|
|
|
/*
|
|
* Other nodes need to do some work in dlm recovery and gfs2_control
|
|
* before the recover_done and control_lock will be ready for us below.
|
|
* A delay here is not required but often avoids having to retry.
|
|
*/
|
|
|
|
msleep_interruptible(500);
|
|
|
|
/*
|
|
* Acquire control_lock in EX and mounted_lock in either EX or PR.
|
|
* control_lock lvb keeps track of any pending journal recoveries.
|
|
* mounted_lock indicates if any other nodes have the fs mounted.
|
|
*/
|
|
|
|
error = control_lock(sdp, DLM_LOCK_EX, DLM_LKF_CONVERT|DLM_LKF_NOQUEUE|DLM_LKF_VALBLK);
|
|
if (error == -EAGAIN) {
|
|
goto restart;
|
|
} else if (error) {
|
|
fs_err(sdp, "control_mount control_lock EX error %d\n", error);
|
|
goto fail;
|
|
}
|
|
|
|
error = mounted_lock(sdp, DLM_LOCK_EX, DLM_LKF_CONVERT|DLM_LKF_NOQUEUE);
|
|
if (!error) {
|
|
mounted_mode = DLM_LOCK_EX;
|
|
goto locks_done;
|
|
} else if (error != -EAGAIN) {
|
|
fs_err(sdp, "control_mount mounted_lock EX error %d\n", error);
|
|
goto fail;
|
|
}
|
|
|
|
error = mounted_lock(sdp, DLM_LOCK_PR, DLM_LKF_CONVERT|DLM_LKF_NOQUEUE);
|
|
if (!error) {
|
|
mounted_mode = DLM_LOCK_PR;
|
|
goto locks_done;
|
|
} else {
|
|
/* not even -EAGAIN should happen here */
|
|
fs_err(sdp, "control_mount mounted_lock PR error %d\n", error);
|
|
goto fail;
|
|
}
|
|
|
|
locks_done:
|
|
/*
|
|
* If we got both locks above in EX, then we're the first mounter.
|
|
* If not, then we need to wait for the control_lock lvb to be
|
|
* updated by other mounted nodes to reflect our mount generation.
|
|
*
|
|
* In simple first mounter cases, first mounter will see zero lvb_gen,
|
|
* but in cases where all existing nodes leave/fail before mounting
|
|
* nodes finish control_mount, then all nodes will be mounting and
|
|
* lvb_gen will be non-zero.
|
|
*/
|
|
|
|
control_lvb_read(ls, &lvb_gen, ls->ls_lvb_bits);
|
|
|
|
if (lvb_gen == 0xFFFFFFFF) {
|
|
/* special value to force mount attempts to fail */
|
|
fs_err(sdp, "control_mount control_lock disabled\n");
|
|
error = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
if (mounted_mode == DLM_LOCK_EX) {
|
|
/* first mounter, keep both EX while doing first recovery */
|
|
spin_lock(&ls->ls_recover_spin);
|
|
clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
|
|
set_bit(DFL_MOUNT_DONE, &ls->ls_recover_flags);
|
|
set_bit(DFL_FIRST_MOUNT, &ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
fs_info(sdp, "first mounter control generation %u\n", lvb_gen);
|
|
return 0;
|
|
}
|
|
|
|
error = control_lock(sdp, DLM_LOCK_NL, DLM_LKF_CONVERT);
|
|
if (error)
|
|
goto fail;
|
|
|
|
/*
|
|
* We are not first mounter, now we need to wait for the control_lock
|
|
* lvb generation to be >= the generation from our first recover_done
|
|
* and all lvb bits to be clear (no pending journal recoveries.)
|
|
*/
|
|
|
|
if (!all_jid_bits_clear(ls->ls_lvb_bits)) {
|
|
/* journals need recovery, wait until all are clear */
|
|
fs_info(sdp, "control_mount wait for journal recovery\n");
|
|
goto restart;
|
|
}
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
block_gen = ls->ls_recover_block;
|
|
start_gen = ls->ls_recover_start;
|
|
mount_gen = ls->ls_recover_mount;
|
|
|
|
if (lvb_gen < mount_gen) {
|
|
/* wait for mounted nodes to update control_lock lvb to our
|
|
generation, which might include new recovery bits set */
|
|
fs_info(sdp, "control_mount wait1 block %u start %u mount %u "
|
|
"lvb %u flags %lx\n", block_gen, start_gen, mount_gen,
|
|
lvb_gen, ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
goto restart;
|
|
}
|
|
|
|
if (lvb_gen != start_gen) {
|
|
/* wait for mounted nodes to update control_lock lvb to the
|
|
latest recovery generation */
|
|
fs_info(sdp, "control_mount wait2 block %u start %u mount %u "
|
|
"lvb %u flags %lx\n", block_gen, start_gen, mount_gen,
|
|
lvb_gen, ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
goto restart;
|
|
}
|
|
|
|
if (block_gen == start_gen) {
|
|
/* dlm recovery in progress, wait for it to finish */
|
|
fs_info(sdp, "control_mount wait3 block %u start %u mount %u "
|
|
"lvb %u flags %lx\n", block_gen, start_gen, mount_gen,
|
|
lvb_gen, ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
goto restart;
|
|
}
|
|
|
|
clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
|
|
set_bit(DFL_MOUNT_DONE, &ls->ls_recover_flags);
|
|
memset(ls->ls_recover_submit, 0, ls->ls_recover_size*sizeof(uint32_t));
|
|
memset(ls->ls_recover_result, 0, ls->ls_recover_size*sizeof(uint32_t));
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
return 0;
|
|
|
|
fail:
|
|
mounted_unlock(sdp);
|
|
control_unlock(sdp);
|
|
return error;
|
|
}
|
|
|
|
static int control_first_done(struct gfs2_sbd *sdp)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
uint32_t start_gen, block_gen;
|
|
int error;
|
|
|
|
restart:
|
|
spin_lock(&ls->ls_recover_spin);
|
|
start_gen = ls->ls_recover_start;
|
|
block_gen = ls->ls_recover_block;
|
|
|
|
if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags) ||
|
|
!test_bit(DFL_MOUNT_DONE, &ls->ls_recover_flags) ||
|
|
!test_bit(DFL_FIRST_MOUNT, &ls->ls_recover_flags)) {
|
|
/* sanity check, should not happen */
|
|
fs_err(sdp, "control_first_done start %u block %u flags %lx\n",
|
|
start_gen, block_gen, ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
control_unlock(sdp);
|
|
return -1;
|
|
}
|
|
|
|
if (start_gen == block_gen) {
|
|
/*
|
|
* Wait for the end of a dlm recovery cycle to switch from
|
|
* first mounter recovery. We can ignore any recover_slot
|
|
* callbacks between the recover_prep and next recover_done
|
|
* because we are still the first mounter and any failed nodes
|
|
* have not fully mounted, so they don't need recovery.
|
|
*/
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
fs_info(sdp, "control_first_done wait gen %u\n", start_gen);
|
|
|
|
wait_on_bit(&ls->ls_recover_flags, DFL_DLM_RECOVERY,
|
|
TASK_UNINTERRUPTIBLE);
|
|
goto restart;
|
|
}
|
|
|
|
clear_bit(DFL_FIRST_MOUNT, &ls->ls_recover_flags);
|
|
set_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags);
|
|
memset(ls->ls_recover_submit, 0, ls->ls_recover_size*sizeof(uint32_t));
|
|
memset(ls->ls_recover_result, 0, ls->ls_recover_size*sizeof(uint32_t));
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
|
|
memset(ls->ls_lvb_bits, 0, GDLM_LVB_SIZE);
|
|
control_lvb_write(ls, start_gen, ls->ls_lvb_bits);
|
|
|
|
error = mounted_lock(sdp, DLM_LOCK_PR, DLM_LKF_CONVERT);
|
|
if (error)
|
|
fs_err(sdp, "control_first_done mounted PR error %d\n", error);
|
|
|
|
error = control_lock(sdp, DLM_LOCK_NL, DLM_LKF_CONVERT|DLM_LKF_VALBLK);
|
|
if (error)
|
|
fs_err(sdp, "control_first_done control NL error %d\n", error);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Expand static jid arrays if necessary (by increments of RECOVER_SIZE_INC)
|
|
* to accomodate the largest slot number. (NB dlm slot numbers start at 1,
|
|
* gfs2 jids start at 0, so jid = slot - 1)
|
|
*/
|
|
|
|
#define RECOVER_SIZE_INC 16
|
|
|
|
static int set_recover_size(struct gfs2_sbd *sdp, struct dlm_slot *slots,
|
|
int num_slots)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
uint32_t *submit = NULL;
|
|
uint32_t *result = NULL;
|
|
uint32_t old_size, new_size;
|
|
int i, max_jid;
|
|
|
|
if (!ls->ls_lvb_bits) {
|
|
ls->ls_lvb_bits = kzalloc(GDLM_LVB_SIZE, GFP_NOFS);
|
|
if (!ls->ls_lvb_bits)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
max_jid = 0;
|
|
for (i = 0; i < num_slots; i++) {
|
|
if (max_jid < slots[i].slot - 1)
|
|
max_jid = slots[i].slot - 1;
|
|
}
|
|
|
|
old_size = ls->ls_recover_size;
|
|
|
|
if (old_size >= max_jid + 1)
|
|
return 0;
|
|
|
|
new_size = old_size + RECOVER_SIZE_INC;
|
|
|
|
submit = kcalloc(new_size, sizeof(uint32_t), GFP_NOFS);
|
|
result = kcalloc(new_size, sizeof(uint32_t), GFP_NOFS);
|
|
if (!submit || !result) {
|
|
kfree(submit);
|
|
kfree(result);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
memcpy(submit, ls->ls_recover_submit, old_size * sizeof(uint32_t));
|
|
memcpy(result, ls->ls_recover_result, old_size * sizeof(uint32_t));
|
|
kfree(ls->ls_recover_submit);
|
|
kfree(ls->ls_recover_result);
|
|
ls->ls_recover_submit = submit;
|
|
ls->ls_recover_result = result;
|
|
ls->ls_recover_size = new_size;
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
return 0;
|
|
}
|
|
|
|
static void free_recover_size(struct lm_lockstruct *ls)
|
|
{
|
|
kfree(ls->ls_lvb_bits);
|
|
kfree(ls->ls_recover_submit);
|
|
kfree(ls->ls_recover_result);
|
|
ls->ls_recover_submit = NULL;
|
|
ls->ls_recover_result = NULL;
|
|
ls->ls_recover_size = 0;
|
|
}
|
|
|
|
/* dlm calls before it does lock recovery */
|
|
|
|
static void gdlm_recover_prep(void *arg)
|
|
{
|
|
struct gfs2_sbd *sdp = arg;
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
ls->ls_recover_block = ls->ls_recover_start;
|
|
set_bit(DFL_DLM_RECOVERY, &ls->ls_recover_flags);
|
|
|
|
if (!test_bit(DFL_MOUNT_DONE, &ls->ls_recover_flags) ||
|
|
test_bit(DFL_FIRST_MOUNT, &ls->ls_recover_flags)) {
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
return;
|
|
}
|
|
set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
}
|
|
|
|
/* dlm calls after recover_prep has been completed on all lockspace members;
|
|
identifies slot/jid of failed member */
|
|
|
|
static void gdlm_recover_slot(void *arg, struct dlm_slot *slot)
|
|
{
|
|
struct gfs2_sbd *sdp = arg;
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
int jid = slot->slot - 1;
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
if (ls->ls_recover_size < jid + 1) {
|
|
fs_err(sdp, "recover_slot jid %d gen %u short size %d",
|
|
jid, ls->ls_recover_block, ls->ls_recover_size);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
return;
|
|
}
|
|
|
|
if (ls->ls_recover_submit[jid]) {
|
|
fs_info(sdp, "recover_slot jid %d gen %u prev %u\n",
|
|
jid, ls->ls_recover_block, ls->ls_recover_submit[jid]);
|
|
}
|
|
ls->ls_recover_submit[jid] = ls->ls_recover_block;
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
}
|
|
|
|
/* dlm calls after recover_slot and after it completes lock recovery */
|
|
|
|
static void gdlm_recover_done(void *arg, struct dlm_slot *slots, int num_slots,
|
|
int our_slot, uint32_t generation)
|
|
{
|
|
struct gfs2_sbd *sdp = arg;
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
|
|
/* ensure the ls jid arrays are large enough */
|
|
set_recover_size(sdp, slots, num_slots);
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
ls->ls_recover_start = generation;
|
|
|
|
if (!ls->ls_recover_mount) {
|
|
ls->ls_recover_mount = generation;
|
|
ls->ls_jid = our_slot - 1;
|
|
}
|
|
|
|
if (!test_bit(DFL_UNMOUNT, &ls->ls_recover_flags))
|
|
queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
|
|
|
|
clear_bit(DFL_DLM_RECOVERY, &ls->ls_recover_flags);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(&ls->ls_recover_flags, DFL_DLM_RECOVERY);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
}
|
|
|
|
/* gfs2_recover thread has a journal recovery result */
|
|
|
|
static void gdlm_recovery_result(struct gfs2_sbd *sdp, unsigned int jid,
|
|
unsigned int result)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
|
|
if (test_bit(DFL_NO_DLM_OPS, &ls->ls_recover_flags))
|
|
return;
|
|
|
|
/* don't care about the recovery of own journal during mount */
|
|
if (jid == ls->ls_jid)
|
|
return;
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
if (test_bit(DFL_FIRST_MOUNT, &ls->ls_recover_flags)) {
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
return;
|
|
}
|
|
if (ls->ls_recover_size < jid + 1) {
|
|
fs_err(sdp, "recovery_result jid %d short size %d",
|
|
jid, ls->ls_recover_size);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
return;
|
|
}
|
|
|
|
fs_info(sdp, "recover jid %d result %s\n", jid,
|
|
result == LM_RD_GAVEUP ? "busy" : "success");
|
|
|
|
ls->ls_recover_result[jid] = result;
|
|
|
|
/* GAVEUP means another node is recovering the journal; delay our
|
|
next attempt to recover it, to give the other node a chance to
|
|
finish before trying again */
|
|
|
|
if (!test_bit(DFL_UNMOUNT, &ls->ls_recover_flags))
|
|
queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work,
|
|
result == LM_RD_GAVEUP ? HZ : 0);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
}
|
|
|
|
const struct dlm_lockspace_ops gdlm_lockspace_ops = {
|
|
.recover_prep = gdlm_recover_prep,
|
|
.recover_slot = gdlm_recover_slot,
|
|
.recover_done = gdlm_recover_done,
|
|
};
|
|
|
|
static int gdlm_mount(struct gfs2_sbd *sdp, const char *table)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
char cluster[GFS2_LOCKNAME_LEN];
|
|
const char *fsname;
|
|
uint32_t flags;
|
|
int error, ops_result;
|
|
|
|
/*
|
|
* initialize everything
|
|
*/
|
|
|
|
INIT_DELAYED_WORK(&sdp->sd_control_work, gfs2_control_func);
|
|
spin_lock_init(&ls->ls_recover_spin);
|
|
ls->ls_recover_flags = 0;
|
|
ls->ls_recover_mount = 0;
|
|
ls->ls_recover_start = 0;
|
|
ls->ls_recover_block = 0;
|
|
ls->ls_recover_size = 0;
|
|
ls->ls_recover_submit = NULL;
|
|
ls->ls_recover_result = NULL;
|
|
ls->ls_lvb_bits = NULL;
|
|
|
|
error = set_recover_size(sdp, NULL, 0);
|
|
if (error)
|
|
goto fail;
|
|
|
|
/*
|
|
* prepare dlm_new_lockspace args
|
|
*/
|
|
|
|
fsname = strchr(table, ':');
|
|
if (!fsname) {
|
|
fs_info(sdp, "no fsname found\n");
|
|
error = -EINVAL;
|
|
goto fail_free;
|
|
}
|
|
memset(cluster, 0, sizeof(cluster));
|
|
memcpy(cluster, table, strlen(table) - strlen(fsname));
|
|
fsname++;
|
|
|
|
flags = DLM_LSFL_FS | DLM_LSFL_NEWEXCL;
|
|
|
|
/*
|
|
* create/join lockspace
|
|
*/
|
|
|
|
error = dlm_new_lockspace(fsname, cluster, flags, GDLM_LVB_SIZE,
|
|
&gdlm_lockspace_ops, sdp, &ops_result,
|
|
&ls->ls_dlm);
|
|
if (error) {
|
|
fs_err(sdp, "dlm_new_lockspace error %d\n", error);
|
|
goto fail_free;
|
|
}
|
|
|
|
if (ops_result < 0) {
|
|
/*
|
|
* dlm does not support ops callbacks,
|
|
* old dlm_controld/gfs_controld are used, try without ops.
|
|
*/
|
|
fs_info(sdp, "dlm lockspace ops not used\n");
|
|
free_recover_size(ls);
|
|
set_bit(DFL_NO_DLM_OPS, &ls->ls_recover_flags);
|
|
return 0;
|
|
}
|
|
|
|
if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags)) {
|
|
fs_err(sdp, "dlm lockspace ops disallow jid preset\n");
|
|
error = -EINVAL;
|
|
goto fail_release;
|
|
}
|
|
|
|
/*
|
|
* control_mount() uses control_lock to determine first mounter,
|
|
* and for later mounts, waits for any recoveries to be cleared.
|
|
*/
|
|
|
|
error = control_mount(sdp);
|
|
if (error) {
|
|
fs_err(sdp, "mount control error %d\n", error);
|
|
goto fail_release;
|
|
}
|
|
|
|
ls->ls_first = !!test_bit(DFL_FIRST_MOUNT, &ls->ls_recover_flags);
|
|
clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
|
|
return 0;
|
|
|
|
fail_release:
|
|
dlm_release_lockspace(ls->ls_dlm, 2);
|
|
fail_free:
|
|
free_recover_size(ls);
|
|
fail:
|
|
return error;
|
|
}
|
|
|
|
static void gdlm_first_done(struct gfs2_sbd *sdp)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
int error;
|
|
|
|
if (test_bit(DFL_NO_DLM_OPS, &ls->ls_recover_flags))
|
|
return;
|
|
|
|
error = control_first_done(sdp);
|
|
if (error)
|
|
fs_err(sdp, "mount first_done error %d\n", error);
|
|
}
|
|
|
|
static void gdlm_unmount(struct gfs2_sbd *sdp)
|
|
{
|
|
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
|
|
|
|
if (test_bit(DFL_NO_DLM_OPS, &ls->ls_recover_flags))
|
|
goto release;
|
|
|
|
/* wait for gfs2_control_wq to be done with this mount */
|
|
|
|
spin_lock(&ls->ls_recover_spin);
|
|
set_bit(DFL_UNMOUNT, &ls->ls_recover_flags);
|
|
spin_unlock(&ls->ls_recover_spin);
|
|
flush_delayed_work(&sdp->sd_control_work);
|
|
|
|
/* mounted_lock and control_lock will be purged in dlm recovery */
|
|
release:
|
|
if (ls->ls_dlm) {
|
|
dlm_release_lockspace(ls->ls_dlm, 2);
|
|
ls->ls_dlm = NULL;
|
|
}
|
|
|
|
free_recover_size(ls);
|
|
}
|
|
|
|
static const match_table_t dlm_tokens = {
|
|
{ Opt_jid, "jid=%d"},
|
|
{ Opt_id, "id=%d"},
|
|
{ Opt_first, "first=%d"},
|
|
{ Opt_nodir, "nodir=%d"},
|
|
{ Opt_err, NULL },
|
|
};
|
|
|
|
const struct lm_lockops gfs2_dlm_ops = {
|
|
.lm_proto_name = "lock_dlm",
|
|
.lm_mount = gdlm_mount,
|
|
.lm_first_done = gdlm_first_done,
|
|
.lm_recovery_result = gdlm_recovery_result,
|
|
.lm_unmount = gdlm_unmount,
|
|
.lm_put_lock = gdlm_put_lock,
|
|
.lm_lock = gdlm_lock,
|
|
.lm_cancel = gdlm_cancel,
|
|
.lm_tokens = &dlm_tokens,
|
|
};
|
|
|