#include <linux/device-mapper.h>
#include <linux/dm-log-userspace.h>
#include <linux/module.h>
+#include <linux/workqueue.h>
#include "dm-log-userspace-transfer.h"
-#define DM_LOG_USERSPACE_VSN "1.1.0"
+#define DM_LOG_USERSPACE_VSN "1.3.0"
struct flush_entry {
int type;
spinlock_t flush_lock;
struct list_head mark_list;
struct list_head clear_list;
+
+ /*
+ * Workqueue for flush of clear region requests.
+ */
+ struct workqueue_struct *dmlog_wq;
+ struct delayed_work flush_log_work;
+ atomic_t sched_flush;
+
+ /*
+ * Combine userspace flush and mark requests for efficiency.
+ */
+ uint32_t integrated_flush;
};
static mempool_t *flush_entry_pool;
*ctr_str = NULL;
+ /*
+ * Determine overall size of the string.
+ */
for (i = 0, str_size = 0; i < argc; i++)
str_size += strlen(argv[i]) + 1; /* +1 for space between args */
return str_size;
}
+static void do_flush(struct work_struct *work)
+{
+ int r;
+ struct log_c *lc = container_of(work, struct log_c, flush_log_work.work);
+
+ atomic_set(&lc->sched_flush, 0);
+
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_FLUSH, NULL, 0, NULL, NULL);
+
+ if (r)
+ dm_table_event(lc->ti->table);
+}
+
/*
* userspace_ctr
*
* argv contains:
- * <UUID> <other args>
- * Where 'other args' is the userspace implementation specific log
- * arguments. An example might be:
- * <UUID> clustered-disk <arg count> <log dev> <region_size> [[no]sync]
+ * <UUID> [integrated_flush] <other args>
+ * Where 'other args' are the userspace implementation-specific log
+ * arguments.
+ *
+ * Example:
+ * <UUID> [integrated_flush] clustered-disk <arg count> <log dev>
+ * <region_size> [[no]sync]
+ *
+ * This module strips off the <UUID> and uses it for identification
+ * purposes when communicating with userspace about a log.
*
- * So, this module will strip off the <UUID> for identification purposes
- * when communicating with userspace about a log; but will pass on everything
- * else.
+ * If integrated_flush is defined, the kernel combines flush
+ * and mark requests.
+ *
+ * The rest of the line, beginning with 'clustered-disk', is passed
+ * to the userspace ctr function.
*/
static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti,
unsigned argc, char **argv)
return -EINVAL;
}
+ lc->usr_argc = argc;
+
strncpy(lc->uuid, argv[0], DM_UUID_LEN);
+ argc--;
+ argv++;
spin_lock_init(&lc->flush_lock);
INIT_LIST_HEAD(&lc->mark_list);
INIT_LIST_HEAD(&lc->clear_list);
- str_size = build_constructor_string(ti, argc - 1, argv + 1, &ctr_str);
+ if (!strcasecmp(argv[0], "integrated_flush")) {
+ lc->integrated_flush = 1;
+ argc--;
+ argv++;
+ }
+
+ str_size = build_constructor_string(ti, argc, argv, &ctr_str);
if (str_size < 0) {
kfree(lc);
return str_size;
DMERR("Failed to register %s with device-mapper",
devices_rdata);
}
+
+ if (lc->integrated_flush) {
+ lc->dmlog_wq = alloc_workqueue("dmlogd", WQ_MEM_RECLAIM, 0);
+ if (!lc->dmlog_wq) {
+ DMERR("couldn't start dmlogd");
+ r = -ENOMEM;
+ goto out;
+ }
+
+ INIT_DELAYED_WORK(&lc->flush_log_work, do_flush);
+ atomic_set(&lc->sched_flush, 0);
+ }
+
out:
kfree(devices_rdata);
if (r) {
kfree(ctr_str);
} else {
lc->usr_argv_str = ctr_str;
- lc->usr_argc = argc;
log->context = lc;
}
{
struct log_c *lc = log->context;
+ if (lc->integrated_flush) {
+ /* flush workqueue */
+ if (atomic_read(&lc->sched_flush))
+ flush_delayed_work(&lc->flush_log_work);
+
+ destroy_workqueue(lc->dmlog_wq);
+ }
+
(void) dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_DTR,
- NULL, 0,
- NULL, NULL);
+ NULL, 0, NULL, NULL);
if (lc->log_dev)
dm_put_device(lc->ti, lc->log_dev);
struct log_c *lc = log->context;
r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_PRESUSPEND,
- NULL, 0,
- NULL, NULL);
+ NULL, 0, NULL, NULL);
return r;
}
int r;
struct log_c *lc = log->context;
+ /*
+ * Run planned flush earlier.
+ */
+ if (lc->integrated_flush && atomic_read(&lc->sched_flush))
+ flush_delayed_work(&lc->flush_log_work);
+
r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_POSTSUSPEND,
- NULL, 0,
- NULL, NULL);
+ NULL, 0, NULL, NULL);
return r;
}
lc->in_sync_hint = 0;
r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_RESUME,
- NULL, 0,
- NULL, NULL);
+ NULL, 0, NULL, NULL);
return r;
}
return r;
}
-static int flush_by_group(struct log_c *lc, struct list_head *flush_list)
+static int flush_by_group(struct log_c *lc, struct list_head *flush_list,
+ int flush_with_payload)
{
int r = 0;
int count;
break;
}
- r = userspace_do_request(lc, lc->uuid, type,
- (char *)(group),
- count * sizeof(uint64_t),
- NULL, NULL);
- if (r) {
- /* Group send failed. Attempt one-by-one. */
- list_splice_init(&tmp_list, flush_list);
- r = flush_one_by_one(lc, flush_list);
- break;
+ if (flush_with_payload) {
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_FLUSH,
+ (char *)(group),
+ count * sizeof(uint64_t),
+ NULL, NULL);
+ /*
+ * Integrated flush failed.
+ */
+ if (r)
+ break;
+ } else {
+ r = userspace_do_request(lc, lc->uuid, type,
+ (char *)(group),
+ count * sizeof(uint64_t),
+ NULL, NULL);
+ if (r) {
+ /*
+ * Group send failed. Attempt one-by-one.
+ */
+ list_splice_init(&tmp_list, flush_list);
+ r = flush_one_by_one(lc, flush_list);
+ break;
+ }
}
}
struct log_c *lc = log->context;
LIST_HEAD(mark_list);
LIST_HEAD(clear_list);
+ int mark_list_is_empty;
+ int clear_list_is_empty;
struct flush_entry *fe, *tmp_fe;
spin_lock_irqsave(&lc->flush_lock, flags);
list_splice_init(&lc->clear_list, &clear_list);
spin_unlock_irqrestore(&lc->flush_lock, flags);
- if (list_empty(&mark_list) && list_empty(&clear_list))
+ mark_list_is_empty = list_empty(&mark_list);
+ clear_list_is_empty = list_empty(&clear_list);
+
+ if (mark_list_is_empty && clear_list_is_empty)
return 0;
- r = flush_by_group(lc, &mark_list);
+ r = flush_by_group(lc, &clear_list, 0);
if (r)
- goto fail;
+ goto out;
- r = flush_by_group(lc, &clear_list);
+ if (!lc->integrated_flush) {
+ r = flush_by_group(lc, &mark_list, 0);
+ if (r)
+ goto out;
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_FLUSH,
+ NULL, 0, NULL, NULL);
+ goto out;
+ }
+
+ /*
+ * Send integrated flush request with mark_list as payload.
+ */
+ r = flush_by_group(lc, &mark_list, 1);
if (r)
- goto fail;
+ goto out;
- r = userspace_do_request(lc, lc->uuid, DM_ULOG_FLUSH,
- NULL, 0, NULL, NULL);
+ if (mark_list_is_empty && !atomic_read(&lc->sched_flush)) {
+ /*
+ * When there are only clear region requests,
+ * we schedule a flush in the future.
+ */
+ queue_delayed_work(lc->dmlog_wq, &lc->flush_log_work, 3 * HZ);
+ atomic_set(&lc->sched_flush, 1);
+ } else {
+ /*
+ * Cancel pending flush because we
+ * have already flushed in mark_region.
+ */
+ cancel_delayed_work(&lc->flush_log_work);
+ atomic_set(&lc->sched_flush, 0);
+ }
-fail:
+out:
/*
- * We can safely remove these entries, even if failure.
+ * We can safely remove these entries, even after failure.
* Calling code will receive an error and will know that
* the log facility has failed.
*/
rdata_size = sizeof(pkg);
r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_RESYNC_WORK,
- NULL, 0,
- (char *)&pkg, &rdata_size);
+ NULL, 0, (char *)&pkg, &rdata_size);
*region = pkg.r;
return (r) ? r : (int)pkg.i;
pkg.i = (int64_t)in_sync;
r = userspace_do_request(lc, lc->uuid, DM_ULOG_SET_REGION_SYNC,
- (char *)&pkg, sizeof(pkg),
- NULL, NULL);
+ (char *)&pkg, sizeof(pkg), NULL, NULL);
/*
* It would be nice to be able to report failures.
rdata_size = sizeof(sync_count);
r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_SYNC_COUNT,
- NULL, 0,
- (char *)&sync_count, &rdata_size);
+ NULL, 0, (char *)&sync_count, &rdata_size);
if (r)
return 0;
switch (status_type) {
case STATUSTYPE_INFO:
r = userspace_do_request(lc, lc->uuid, DM_ULOG_STATUS_INFO,
- NULL, 0,
- result, &sz);
+ NULL, 0, result, &sz);
if (r) {
sz = 0;
BUG_ON(!table_args); /* There will always be a ' ' */
table_args++;
- DMEMIT("%s %u %s %s ", log->type->name, lc->usr_argc,
- lc->uuid, table_args);
+ DMEMIT("%s %u %s ", log->type->name, lc->usr_argc, lc->uuid);
+ if (lc->integrated_flush)
+ DMEMIT("integrated_flush ");
+ DMEMIT("%s ", table_args);
break;
}
return (r) ? 0 : (int)sz;
git.samba.org / sfrench / cifs-2.6.git / commitdiff