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authorNeilBrown <neilb@cse.unsw.edu.au>2005-06-21 17:17:13 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 19:07:43 -0700
commit57afd89f98a990747445f01c458ecae64263b2f8 (patch)
treecab9f5941f32299bc97936e111f6552ebcee9cf6
parent06d91a5fe0b50c9060e70bdf7786f8a3c66249db (diff)
[PATCH] md: improve the interface to sync_request
1/ change the return value (which is number-of-sectors synced) from 'int' to 'sector_t'. The number of sectors is usually easily small enough to fit in an int, but if resync needs to abort, it may want to return the total number of remaining sectors, which could be large. Also errors cannot be returned as negative numbers now, so use 0 instead 2/ Add a 'skipped' return parameter to allow the array to report that it skipped the sectors. This allows md to take this into account in the speed calculations. Currently there is no important skipping, but the bitmap-based-resync that is coming will use this. Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/md/md.c35
-rw-r--r--drivers/md/raid1.c8
-rw-r--r--drivers/md/raid10.c19
-rw-r--r--drivers/md/raid5.c6
-rw-r--r--drivers/md/raid6main.c6
-rw-r--r--include/linux/raid/md_k.h2
6 files changed, 46 insertions, 30 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 177d2a7d7ce..fa608a1a5c2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3241,12 +3241,13 @@ static void md_do_sync(mddev_t *mddev)
mddev_t *mddev2;
unsigned int currspeed = 0,
window;
- sector_t max_sectors,j;
+ sector_t max_sectors,j, io_sectors;
unsigned long mark[SYNC_MARKS];
sector_t mark_cnt[SYNC_MARKS];
int last_mark,m;
struct list_head *tmp;
sector_t last_check;
+ int skipped = 0;
/* just incase thread restarts... */
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
@@ -3312,7 +3313,7 @@ static void md_do_sync(mddev_t *mddev)
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
/* resync follows the size requested by the personality,
- * which default to physical size, but can be virtual size
+ * which defaults to physical size, but can be virtual size
*/
max_sectors = mddev->resync_max_sectors;
else
@@ -3331,9 +3332,10 @@ static void md_do_sync(mddev_t *mddev)
j = mddev->recovery_cp;
else
j = 0;
+ io_sectors = 0;
for (m = 0; m < SYNC_MARKS; m++) {
mark[m] = jiffies;
- mark_cnt[m] = j;
+ mark_cnt[m] = io_sectors;
}
last_mark = 0;
mddev->resync_mark = mark[last_mark];
@@ -3358,21 +3360,29 @@ static void md_do_sync(mddev_t *mddev)
}
while (j < max_sectors) {
- int sectors;
+ sector_t sectors;
- sectors = mddev->pers->sync_request(mddev, j, currspeed < sysctl_speed_limit_min);
- if (sectors < 0) {
+ skipped = 0;
+ sectors = mddev->pers->sync_request(mddev, j, &skipped,
+ currspeed < sysctl_speed_limit_min);
+ if (sectors == 0) {
set_bit(MD_RECOVERY_ERR, &mddev->recovery);
goto out;
}
- atomic_add(sectors, &mddev->recovery_active);
+
+ if (!skipped) { /* actual IO requested */
+ io_sectors += sectors;
+ atomic_add(sectors, &mddev->recovery_active);
+ }
+
j += sectors;
if (j>1) mddev->curr_resync = j;
- if (last_check + window > j || j == max_sectors)
+
+ if (last_check + window > io_sectors || j == max_sectors)
continue;
- last_check = j;
+ last_check = io_sectors;
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
test_bit(MD_RECOVERY_ERR, &mddev->recovery))
@@ -3386,7 +3396,7 @@ static void md_do_sync(mddev_t *mddev)
mddev->resync_mark = mark[next];
mddev->resync_mark_cnt = mark_cnt[next];
mark[next] = jiffies;
- mark_cnt[next] = j - atomic_read(&mddev->recovery_active);
+ mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
last_mark = next;
}
@@ -3413,7 +3423,8 @@ static void md_do_sync(mddev_t *mddev)
mddev->queue->unplug_fn(mddev->queue);
cond_resched();
- currspeed = ((unsigned long)(j-mddev->resync_mark_cnt))/2/((jiffies-mddev->resync_mark)/HZ +1) +1;
+ currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
+ /((jiffies-mddev->resync_mark)/HZ +1) +1;
if (currspeed > sysctl_speed_limit_min) {
if ((currspeed > sysctl_speed_limit_max) ||
@@ -3433,7 +3444,7 @@ static void md_do_sync(mddev_t *mddev)
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
/* tell personality that we are finished */
- mddev->pers->sync_request(mddev, max_sectors, 1);
+ mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
mddev->curr_resync > 2 &&
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 3f1280bbaf3..3c5c916cb09 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1010,7 +1010,7 @@ static int init_resync(conf_t *conf)
* that can be installed to exclude normal IO requests.
*/
-static int sync_request(mddev_t *mddev, sector_t sector_nr, int go_faster)
+static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
{
conf_t *conf = mddev_to_conf(mddev);
mirror_info_t *mirror;
@@ -1023,7 +1023,7 @@ static int sync_request(mddev_t *mddev, sector_t sector_nr, int go_faster)
if (!conf->r1buf_pool)
if (init_resync(conf))
- return -ENOMEM;
+ return 0;
max_sector = mddev->size << 1;
if (sector_nr >= max_sector) {
@@ -1107,8 +1107,8 @@ static int sync_request(mddev_t *mddev, sector_t sector_nr, int go_faster)
/* There is nowhere to write, so all non-sync
* drives must be failed - so we are finished
*/
- int rv = max_sector - sector_nr;
- md_done_sync(mddev, rv, 1);
+ sector_t rv = max_sector - sector_nr;
+ *skipped = 1;
put_buf(r1_bio);
rdev_dec_pending(conf->mirrors[disk].rdev, mddev);
return rv;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index bfc9f52f0ec..8476515bfdc 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1321,7 +1321,7 @@ static int init_resync(conf_t *conf)
*
*/
-static int sync_request(mddev_t *mddev, sector_t sector_nr, int go_faster)
+static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
{
conf_t *conf = mddev_to_conf(mddev);
r10bio_t *r10_bio;
@@ -1335,7 +1335,7 @@ static int sync_request(mddev_t *mddev, sector_t sector_nr, int go_faster)
if (!conf->r10buf_pool)
if (init_resync(conf))
- return -ENOMEM;
+ return 0;
skipped:
max_sector = mddev->size << 1;
@@ -1343,15 +1343,15 @@ static int sync_request(mddev_t *mddev, sector_t sector_nr, int go_faster)
max_sector = mddev->resync_max_sectors;
if (sector_nr >= max_sector) {
close_sync(conf);
+ *skipped = 1;
return sectors_skipped;
}
if (chunks_skipped >= conf->raid_disks) {
/* if there has been nothing to do on any drive,
* then there is nothing to do at all..
*/
- sector_t sec = max_sector - sector_nr;
- md_done_sync(mddev, sec, 1);
- return sec + sectors_skipped;
+ *skipped = 1;
+ return (max_sector - sector_nr) + sectors_skipped;
}
/* make sure whole request will fit in a chunk - if chunks
@@ -1565,17 +1565,22 @@ static int sync_request(mddev_t *mddev, sector_t sector_nr, int go_faster)
}
}
+ if (sectors_skipped)
+ /* pretend they weren't skipped, it makes
+ * no important difference in this case
+ */
+ md_done_sync(mddev, sectors_skipped, 1);
+
return sectors_skipped + nr_sectors;
giveup:
/* There is nowhere to write, so all non-sync
* drives must be failed, so try the next chunk...
*/
{
- int sec = max_sector - sector_nr;
+ sector_t sec = max_sector - sector_nr;
sectors_skipped += sec;
chunks_skipped ++;
sector_nr = max_sector;
- md_done_sync(mddev, sec, 1);
goto skipped;
}
}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 677ce49078d..1ce3f5aaa98 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1477,7 +1477,7 @@ static int make_request (request_queue_t *q, struct bio * bi)
}
/* FIXME go_faster isn't used */
-static int sync_request (mddev_t *mddev, sector_t sector_nr, int go_faster)
+static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
{
raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
struct stripe_head *sh;
@@ -1500,8 +1500,8 @@ static int sync_request (mddev_t *mddev, sector_t sector_nr, int go_faster)
* nothing we can do.
*/
if (mddev->degraded >= 1 && test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
- int rv = (mddev->size << 1) - sector_nr;
- md_done_sync(mddev, rv, 1);
+ sector_t rv = (mddev->size << 1) - sector_nr;
+ *skipped = 1;
return rv;
}
diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index fede16c4e8f..d9c385496dc 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -1636,7 +1636,7 @@ static int make_request (request_queue_t *q, struct bio * bi)
}
/* FIXME go_faster isn't used */
-static int sync_request (mddev_t *mddev, sector_t sector_nr, int go_faster)
+static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
{
raid6_conf_t *conf = (raid6_conf_t *) mddev->private;
struct stripe_head *sh;
@@ -1659,8 +1659,8 @@ static int sync_request (mddev_t *mddev, sector_t sector_nr, int go_faster)
* nothing we can do.
*/
if (mddev->degraded >= 2 && test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
- int rv = (mddev->size << 1) - sector_nr;
- md_done_sync(mddev, rv, 1);
+ sector_t rv = (mddev->size << 1) - sector_nr;
+ *skipped = 1;
return rv;
}
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index d92db54255a..bce0032decf 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -298,7 +298,7 @@ struct mdk_personality_s
int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev);
int (*hot_remove_disk) (mddev_t *mddev, int number);
int (*spare_active) (mddev_t *mddev);
- int (*sync_request)(mddev_t *mddev, sector_t sector_nr, int go_faster);
+ sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster);
int (*resize) (mddev_t *mddev, sector_t sectors);
int (*reshape) (mddev_t *mddev, int raid_disks);
int (*reconfig) (mddev_t *mddev, int layout, int chunk_size);