linux/fs/gfs2/lock_dlm.c
Bob Peterson 601ef0d52e gfs2: Force withdraw to replay journals and wait for it to finish
When a node withdraws from a file system, it often leaves its journal
in an incomplete state. This is especially true when the withdraw is
caused by io errors writing to the journal. Before this patch, a
withdraw would try to write a "shutdown" record to the journal, tell
dlm it's done with the file system, and none of the other nodes
know about the problem. Later, when the problem is fixed and the
withdrawn node is rebooted, it would then discover that its own
journal was incomplete, and replay it. However, replaying it at this
point is almost guaranteed to introduce corruption because the other
nodes are likely to have used affected resource groups that appeared
in the journal since the time of the withdraw. Replaying the journal
later will overwrite any changes made, and not through any fault of
dlm, which was instructed during the withdraw to release those
resources.

This patch makes file system withdraws seen by the entire cluster.
Withdrawing nodes dequeue their journal glock to allow recovery.

The remaining nodes check all the journals to see if they are
clean or in need of replay. They try to replay dirty journals, but
only the journals of withdrawn nodes will be "not busy" and
therefore available for replay.

Until the journal replay is complete, no i/o related glocks may be
given out, to ensure that the replay does not cause the
aforementioned corruption: We cannot allow any journal replay to
overwrite blocks associated with a glock once it is held.

The "live" glock which is now used to signal when a withdraw
occurs. When a withdraw occurs, the node signals its withdraw by
dequeueing the "live" glock and trying to enqueue it in EX mode,
thus forcing the other nodes to all see a demote request, by way
of a "1CB" (one callback) try lock. The "live" glock is not
granted in EX; the callback is only just used to indicate a
withdraw has occurred.

Note that all nodes in the cluster must wait for the recovering
node to finish replaying the withdrawing node's journal before
continuing. To this end, it checks that the journals are clean
multiple times in a retry loop.

Also note that the withdraw function may be called from a wide
variety of situations, and therefore, we need to take extra
precautions to make sure pointers are valid before using them in
many circumstances.

We also need to take care when glocks decide to withdraw, since
the withdraw code now uses glocks.

Also, before this patch, if a process encountered an error and
decided to withdraw, if another process was already withdrawing,
the second withdraw would be silently ignored, which set it free
to unlock its glocks. That's correct behavior if the original
withdrawer encounters further errors down the road. But if
secondary waiters don't wait for the journal replay, unlocking
glocks will allow other nodes to use them, despite the fact that
the journal containing those blocks is being replayed. The
replay needs to finish before our glocks are released to other
nodes. IOW, secondary withdraws need to wait for the first
withdraw to finish.

For example, if an rgrp glock is unlocked by a process that didn't
wait for the first withdraw, a journal replay could introduce file
system corruption by replaying a rgrp block that has already been
granted to a different cluster node.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2020-02-27 07:53:12 -06:00

1401 lines
40 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright 2004-2011 Red Hat, Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/fs.h>
#include <linux/dlm.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/gfs2_ondisk.h>
#include <linux/sched/signal.h>
#include "incore.h"
#include "glock.h"
#include "glops.h"
#include "recovery.h"
#include "util.h"
#include "sys.h"
#include "trace_gfs2.h"
/**
* gfs2_update_stats - Update time based stats
* @mv: Pointer to mean/variance structure to update
* @sample: New data to include
*
* @delta is the difference between the current rtt sample and the
* running average srtt. We add 1/8 of that to the srtt in order to
* update the current srtt estimate. The variance estimate is a bit
* more complicated. We subtract the current variance estimate from
* the abs value of the @delta and add 1/4 of that to the running
* total. That's equivalent to 3/4 of the current variance
* estimate plus 1/4 of the abs of @delta.
*
* Note that the index points at the array entry containing the smoothed
* mean value, and the variance is always in the following entry
*
* Reference: TCP/IP Illustrated, vol 2, p. 831,832
* All times are in units of integer nanoseconds. Unlike the TCP/IP case,
* they are not scaled fixed point.
*/
static inline void gfs2_update_stats(struct gfs2_lkstats *s, unsigned index,
s64 sample)
{
s64 delta = sample - s->stats[index];
s->stats[index] += (delta >> 3);
index++;
s->stats[index] += (s64)(abs(delta) - s->stats[index]) >> 2;
}
/**
* gfs2_update_reply_times - Update locking statistics
* @gl: The glock to update
*
* This assumes that gl->gl_dstamp has been set earlier.
*
* The rtt (lock round trip time) is an estimate of the time
* taken to perform a dlm lock request. We update it on each
* reply from the dlm.
*
* The blocking flag is set on the glock for all dlm requests
* which may potentially block due to lock requests from other nodes.
* DLM requests where the current lock state is exclusive, the
* requested state is null (or unlocked) or where the TRY or
* TRY_1CB flags are set are classified as non-blocking. All
* other DLM requests are counted as (potentially) blocking.
*/
static inline void gfs2_update_reply_times(struct gfs2_glock *gl)
{
struct gfs2_pcpu_lkstats *lks;
const unsigned gltype = gl->gl_name.ln_type;
unsigned index = test_bit(GLF_BLOCKING, &gl->gl_flags) ?
GFS2_LKS_SRTTB : GFS2_LKS_SRTT;
s64 rtt;
preempt_disable();
rtt = ktime_to_ns(ktime_sub(ktime_get_real(), gl->gl_dstamp));
lks = this_cpu_ptr(gl->gl_name.ln_sbd->sd_lkstats);
gfs2_update_stats(&gl->gl_stats, index, rtt); /* Local */
gfs2_update_stats(&lks->lkstats[gltype], index, rtt); /* Global */
preempt_enable();
trace_gfs2_glock_lock_time(gl, rtt);
}
/**
* gfs2_update_request_times - Update locking statistics
* @gl: The glock to update
*
* The irt (lock inter-request times) measures the average time
* between requests to the dlm. It is updated immediately before
* each dlm call.
*/
static inline void gfs2_update_request_times(struct gfs2_glock *gl)
{
struct gfs2_pcpu_lkstats *lks;
const unsigned gltype = gl->gl_name.ln_type;
ktime_t dstamp;
s64 irt;
preempt_disable();
dstamp = gl->gl_dstamp;
gl->gl_dstamp = ktime_get_real();
irt = ktime_to_ns(ktime_sub(gl->gl_dstamp, dstamp));
lks = this_cpu_ptr(gl->gl_name.ln_sbd->sd_lkstats);
gfs2_update_stats(&gl->gl_stats, GFS2_LKS_SIRT, irt); /* Local */
gfs2_update_stats(&lks->lkstats[gltype], GFS2_LKS_SIRT, irt); /* Global */
preempt_enable();
}
static void gdlm_ast(void *arg)
{
struct gfs2_glock *gl = arg;
unsigned ret = gl->gl_state;
gfs2_update_reply_times(gl);
BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED);
if ((gl->gl_lksb.sb_flags & DLM_SBF_VALNOTVALID) && gl->gl_lksb.sb_lvbptr)
memset(gl->gl_lksb.sb_lvbptr, 0, GDLM_LVB_SIZE);
switch (gl->gl_lksb.sb_status) {
case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */
if (gl->gl_ops->go_free)
gl->gl_ops->go_free(gl);
gfs2_glock_free(gl);
return;
case -DLM_ECANCEL: /* Cancel while getting lock */
ret |= LM_OUT_CANCELED;
goto out;
case -EAGAIN: /* Try lock fails */
case -EDEADLK: /* Deadlock detected */
goto out;
case -ETIMEDOUT: /* Canceled due to timeout */
ret |= LM_OUT_ERROR;
goto out;
case 0: /* Success */
break;
default: /* Something unexpected */
BUG();
}
ret = gl->gl_req;
if (gl->gl_lksb.sb_flags & DLM_SBF_ALTMODE) {
if (gl->gl_req == LM_ST_SHARED)
ret = LM_ST_DEFERRED;
else if (gl->gl_req == LM_ST_DEFERRED)
ret = LM_ST_SHARED;
else
BUG();
}
set_bit(GLF_INITIAL, &gl->gl_flags);
gfs2_glock_complete(gl, ret);
return;
out:
if (!test_bit(GLF_INITIAL, &gl->gl_flags))
gl->gl_lksb.sb_lkid = 0;
gfs2_glock_complete(gl, ret);
}
static void gdlm_bast(void *arg, int mode)
{
struct gfs2_glock *gl = arg;
switch (mode) {
case DLM_LOCK_EX:
gfs2_glock_cb(gl, LM_ST_UNLOCKED);
break;
case DLM_LOCK_CW:
gfs2_glock_cb(gl, LM_ST_DEFERRED);
break;
case DLM_LOCK_PR:
gfs2_glock_cb(gl, LM_ST_SHARED);
break;
default:
fs_err(gl->gl_name.ln_sbd, "unknown bast mode %d\n", mode);
BUG();
}
}
/* convert gfs lock-state to dlm lock-mode */
static int make_mode(struct gfs2_sbd *sdp, const unsigned int lmstate)
{
switch (lmstate) {
case LM_ST_UNLOCKED:
return DLM_LOCK_NL;
case LM_ST_EXCLUSIVE:
return DLM_LOCK_EX;
case LM_ST_DEFERRED:
return DLM_LOCK_CW;
case LM_ST_SHARED:
return DLM_LOCK_PR;
}
fs_err(sdp, "unknown LM state %d\n", lmstate);
BUG();
return -1;
}
static u32 make_flags(struct gfs2_glock *gl, const unsigned int gfs_flags,
const int req)
{
u32 lkf = 0;
if (gl->gl_lksb.sb_lvbptr)
lkf |= DLM_LKF_VALBLK;
if (gfs_flags & LM_FLAG_TRY)
lkf |= DLM_LKF_NOQUEUE;
if (gfs_flags & LM_FLAG_TRY_1CB) {
lkf |= DLM_LKF_NOQUEUE;
lkf |= DLM_LKF_NOQUEUEBAST;
}
if (gfs_flags & LM_FLAG_PRIORITY) {
lkf |= DLM_LKF_NOORDER;
lkf |= DLM_LKF_HEADQUE;
}
if (gfs_flags & LM_FLAG_ANY) {
if (req == DLM_LOCK_PR)
lkf |= DLM_LKF_ALTCW;
else if (req == DLM_LOCK_CW)
lkf |= DLM_LKF_ALTPR;
else
BUG();
}
if (gl->gl_lksb.sb_lkid != 0) {
lkf |= DLM_LKF_CONVERT;
if (test_bit(GLF_BLOCKING, &gl->gl_flags))
lkf |= DLM_LKF_QUECVT;
}
return lkf;
}
static void gfs2_reverse_hex(char *c, u64 value)
{
*c = '0';
while (value) {
*c-- = hex_asc[value & 0x0f];
value >>= 4;
}
}
static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state,
unsigned int flags)
{
struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
int req;
u32 lkf;
char strname[GDLM_STRNAME_BYTES] = "";
req = make_mode(gl->gl_name.ln_sbd, req_state);
lkf = make_flags(gl, flags, req);
gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT);
gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT);
if (gl->gl_lksb.sb_lkid) {
gfs2_update_request_times(gl);
} else {
memset(strname, ' ', GDLM_STRNAME_BYTES - 1);
strname[GDLM_STRNAME_BYTES - 1] = '\0';
gfs2_reverse_hex(strname + 7, gl->gl_name.ln_type);
gfs2_reverse_hex(strname + 23, gl->gl_name.ln_number);
gl->gl_dstamp = ktime_get_real();
}
/*
* Submit the actual lock request.
*/
return dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, strname,
GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
}
static void gdlm_put_lock(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
int lvb_needs_unlock = 0;
int error;
if (gl->gl_lksb.sb_lkid == 0) {
gfs2_glock_free(gl);
return;
}
clear_bit(GLF_BLOCKING, &gl->gl_flags);
gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT);
gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT);
gfs2_update_request_times(gl);
/* don't want to skip dlm_unlock writing the lvb when lock is ex */
if (gl->gl_lksb.sb_lvbptr && (gl->gl_state == LM_ST_EXCLUSIVE))
lvb_needs_unlock = 1;
if (test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags) &&
!lvb_needs_unlock) {
gfs2_glock_free(gl);
return;
}
error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK,
NULL, gl);
if (error) {
fs_err(sdp, "gdlm_unlock %x,%llx err=%d\n",
gl->gl_name.ln_type,
(unsigned long long)gl->gl_name.ln_number, error);
return;
}
}
static void gdlm_cancel(struct gfs2_glock *gl)
{
struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl);
}
/*
* dlm/gfs2 recovery coordination using dlm_recover callbacks
*
* 0. gfs2 checks for another cluster node withdraw, needing journal replay
* 1. dlm_controld sees lockspace members change
* 2. dlm_controld blocks dlm-kernel locking activity
* 3. dlm_controld within dlm-kernel notifies gfs2 (recover_prep)
* 4. dlm_controld starts and finishes its own user level recovery
* 5. dlm_controld starts dlm-kernel dlm_recoverd to do kernel recovery
* 6. dlm_recoverd notifies gfs2 of failed nodes (recover_slot)
* 7. dlm_recoverd does its own lock recovery
* 8. dlm_recoverd unblocks dlm-kernel locking activity
* 9. dlm_recoverd notifies gfs2 when done (recover_done with new generation)
* 10. gfs2_control updates control_lock lvb with new generation and jid bits
* 11. gfs2_control enqueues journals for gfs2_recover to recover (maybe none)
* 12. gfs2_recover dequeues and recovers journals of failed nodes
* 13. gfs2_recover provides recovery results to gfs2_control (recovery_result)
* 14. gfs2_control updates control_lock lvb jid bits for recovered journals
* 15. gfs2_control unblocks normal locking when all journals are recovered
*
* - failures during recovery
*
* recover_prep() may set BLOCK_LOCKS (step 3) again before gfs2_control
* clears BLOCK_LOCKS (step 15), e.g. another node fails while still
* recovering for a prior failure. gfs2_control needs a way to detect
* this so it can leave BLOCK_LOCKS set in step 15. This is managed using
* the recover_block and recover_start values.
*
* recover_done() provides a new lockspace generation number each time it
* is called (step 9). This generation number is saved as recover_start.
* When recover_prep() is called, it sets BLOCK_LOCKS and sets
* recover_block = recover_start. So, while recover_block is equal to
* recover_start, BLOCK_LOCKS should remain set. (recover_spin must
* be held around the BLOCK_LOCKS/recover_block/recover_start logic.)
*
* - more specific gfs2 steps in sequence above
*
* 3. recover_prep sets BLOCK_LOCKS and sets recover_block = recover_start
* 6. recover_slot records any failed jids (maybe none)
* 9. recover_done sets recover_start = new generation number
* 10. gfs2_control sets control_lock lvb = new gen + bits for failed jids
* 12. gfs2_recover does journal recoveries for failed jids identified above
* 14. gfs2_control clears control_lock lvb bits for recovered jids
* 15. gfs2_control checks if recover_block == recover_start (step 3 occured
* again) then do nothing, otherwise if recover_start > recover_block
* then clear BLOCK_LOCKS.
*
* - parallel recovery steps across all nodes
*
* All nodes attempt to update the control_lock lvb with the new generation
* number and jid bits, but only the first to get the control_lock EX will
* do so; others will see that it's already done (lvb already contains new
* generation number.)
*
* . All nodes get the same recover_prep/recover_slot/recover_done callbacks
* . All nodes attempt to set control_lock lvb gen + bits for the new gen
* . One node gets control_lock first and writes the lvb, others see it's done
* . All nodes attempt to recover jids for which they see control_lock bits set
* . One node succeeds for a jid, and that one clears the jid bit in the lvb
* . All nodes will eventually see all lvb bits clear and unblock locks
*
* - is there a problem with clearing an lvb bit that should be set
* and missing a journal recovery?
*
* 1. jid fails
* 2. lvb bit set for step 1
* 3. jid recovered for step 1
* 4. jid taken again (new mount)
* 5. jid fails (for step 4)
* 6. lvb bit set for step 5 (will already be set)
* 7. lvb bit cleared for step 3
*
* This is not a problem because the failure in step 5 does not
* require recovery, because the mount in step 4 could not have
* progressed far enough to unblock locks and access the fs. The
* control_mount() function waits for all recoveries to be complete
* for the latest lockspace generation before ever unblocking locks
* and returning. The mount in step 4 waits until the recovery in
* step 1 is done.
*
* - special case of first mounter: first node to mount the fs
*
* The first node to mount a gfs2 fs needs to check all the journals
* and recover any that need recovery before other nodes are allowed
* to mount the fs. (Others may begin mounting, but they must wait
* for the first mounter to be done before taking locks on the fs
* or accessing the fs.) This has two parts:
*
* 1. The mounted_lock tells a node it's the first to mount the fs.
* Each node holds the mounted_lock in PR while it's mounted.
* Each node tries to acquire the mounted_lock in EX when it mounts.
* If a node is granted the mounted_lock EX it means there are no
* other mounted nodes (no PR locks exist), and it is the first mounter.
* The mounted_lock is demoted to PR when first recovery is done, so
* others will fail to get an EX lock, but will get a PR lock.
*
* 2. The control_lock blocks others in control_mount() while the first
* mounter is doing first mount recovery of all journals.
* A mounting node needs to acquire control_lock in EX mode before
* it can proceed. The first mounter holds control_lock in EX while doing
* the first mount recovery, blocking mounts from other nodes, then demotes
* control_lock to NL when it's done (others_may_mount/first_done),
* allowing other nodes to continue mounting.
*
* first mounter:
* control_lock EX/NOQUEUE success
* mounted_lock EX/NOQUEUE success (no other PR, so no other mounters)
* set first=1
* do first mounter recovery
* mounted_lock EX->PR
* control_lock EX->NL, write lvb generation
*
* other mounter:
* 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");
}
/**
* remote_withdraw - react to a node withdrawing from the file system
* @sdp: The superblock
*/
static void remote_withdraw(struct gfs2_sbd *sdp)
{
struct gfs2_jdesc *jd;
int ret = 0, count = 0;
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
if (jd->jd_jid == sdp->sd_lockstruct.ls_jid)
continue;
ret = gfs2_recover_journal(jd, true);
if (ret)
break;
count++;
}
/* Now drop the additional reference we acquired */
fs_err(sdp, "Journals checked: %d, ret = %d.\n", count, ret);
}
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;
/* First check for other nodes that may have done a withdraw. */
if (test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags)) {
remote_withdraw(sdp);
clear_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
return;
}
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;
}
/**
* If we're a spectator, we don't want to take the lock in EX because
* we cannot do the first-mount responsibility it implies: recovery.
*/
if (sdp->sd_args.ar_spectator)
goto locks_done;
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 */
if (sdp->sd_args.ar_spectator) {
fs_info(sdp, "Recovery is required. Waiting for a "
"non-spectator to mount.\n");
msleep_interruptible(1000);
} else {
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;
new_size = old_size;
while (new_size < max_jid + 1)
new_size += RECOVER_SIZE_INC;
if (new_size == old_size)
return 0;
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;
ls->ls_lvb_bits = NULL;
}
/* 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;
if (gfs2_withdrawn(sdp)) {
fs_err(sdp, "recover_prep ignored due to withdraw.\n");
return;
}
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;
if (gfs2_withdrawn(sdp)) {
fs_err(sdp, "recover_slot jid %d ignored due to withdraw.\n",
jid);
return;
}
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\n",
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;
if (gfs2_withdrawn(sdp)) {
fs_err(sdp, "recover_done ignored due to withdraw.\n");
return;
}
/* 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 (gfs2_withdrawn(sdp)) {
fs_err(sdp, "recovery_result jid %d ignored due to withdraw.\n",
jid);
return;
}
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\n",
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);
}
static 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,
};