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authorLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 09:02:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 09:02:01 -0700
commitfcff06c438b60f415af5983efe92811d6aa02ad1 (patch)
tree704f6598b2de60a86774bc5cf152d4f051bd2dc4
parent068535f1fef4c90aee23eb7b9b9a71c5b72d7cd0 (diff)
parent63f33b8dda88923487004b20fba825486d009e7b (diff)
downloadlinux-sh-fcff06c438b60f415af5983efe92811d6aa02ad1.tar.gz
Merge branch 'for-next' of git://neil.brown.name/md
Pull md updates from NeilBrown. * 'for-next' of git://neil.brown.name/md: DM RAID: Add support for MD RAID10 md/RAID1: Add missing case for attempting to repair known bad blocks. md/raid5: For odirect-write performance, do not set STRIPE_PREREAD_ACTIVE. md/raid1: don't abort a resync on the first badblock. md: remove duplicated test on ->openers when calling do_md_stop() raid5: Add R5_ReadNoMerge flag which prevent bio from merging at block layer md/raid1: prevent merging too large request md/raid1: read balance chooses idlest disk for SSD md/raid1: make sequential read detection per disk based MD RAID10: Export md_raid10_congested MD: Move macros from raid1*.h to raid1*.c MD RAID1: rename mirror_info structure MD RAID10: rename mirror_info structure MD RAID10: Fix compiler warning. raid5: add a per-stripe lock raid5: remove unnecessary bitmap write optimization raid5: lockless access raid5 overrided bi_phys_segments raid5: reduce chance release_stripe() taking device_lock
-rw-r--r--Documentation/device-mapper/dm-raid.txt26
-rw-r--r--drivers/md/dm-raid.c95
-rw-r--r--drivers/md/md.c8
-rw-r--r--drivers/md/raid1.c164
-rw-r--r--drivers/md/raid1.h30
-rw-r--r--drivers/md/raid10.c92
-rw-r--r--drivers/md/raid10.h23
-rw-r--r--drivers/md/raid5.c205
-rw-r--r--drivers/md/raid5.h2
9 files changed, 426 insertions, 219 deletions
diff --git a/Documentation/device-mapper/dm-raid.txt b/Documentation/device-mapper/dm-raid.txt
index 946c73342cde..1c1844957166 100644
--- a/Documentation/device-mapper/dm-raid.txt
+++ b/Documentation/device-mapper/dm-raid.txt
@@ -27,6 +27,10 @@ The target is named "raid" and it accepts the following parameters:
- rotating parity N (right-to-left) with data restart
raid6_nc RAID6 N continue
- rotating parity N (right-to-left) with data continuation
+ raid10 Various RAID10 inspired algorithms chosen by additional params
+ - RAID10: Striped Mirrors (aka 'Striping on top of mirrors')
+ - RAID1E: Integrated Adjacent Stripe Mirroring
+ - and other similar RAID10 variants
Reference: Chapter 4 of
http://www.snia.org/sites/default/files/SNIA_DDF_Technical_Position_v2.0.pdf
@@ -59,6 +63,28 @@ The target is named "raid" and it accepts the following parameters:
logical size of the array. The bitmap records the device
synchronisation state for each region.
+ [raid10_copies <# copies>]
+ [raid10_format near]
+ These two options are used to alter the default layout of
+ a RAID10 configuration. The number of copies is can be
+ specified, but the default is 2. There are other variations
+ to how the copies are laid down - the default and only current
+ option is "near". Near copies are what most people think of
+ with respect to mirroring. If these options are left
+ unspecified, or 'raid10_copies 2' and/or 'raid10_format near'
+ are given, then the layouts for 2, 3 and 4 devices are:
+ 2 drives 3 drives 4 drives
+ -------- ---------- --------------
+ A1 A1 A1 A1 A2 A1 A1 A2 A2
+ A2 A2 A2 A3 A3 A3 A3 A4 A4
+ A3 A3 A4 A4 A5 A5 A5 A6 A6
+ A4 A4 A5 A6 A6 A7 A7 A8 A8
+ .. .. .. .. .. .. .. .. ..
+ The 2-device layout is equivalent 2-way RAID1. The 4-device
+ layout is what a traditional RAID10 would look like. The
+ 3-device layout is what might be called a 'RAID1E - Integrated
+ Adjacent Stripe Mirroring'.
+
<#raid_devs>: The number of devices composing the array.
Each device consists of two entries. The first is the device
containing the metadata (if any); the second is the one containing the
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index f2f29c526544..982e3e390c45 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -11,6 +11,7 @@
#include "md.h"
#include "raid1.h"
#include "raid5.h"
+#include "raid10.h"
#include "bitmap.h"
#include <linux/device-mapper.h>
@@ -52,7 +53,10 @@ struct raid_dev {
#define DMPF_MAX_RECOVERY_RATE 0x20
#define DMPF_MAX_WRITE_BEHIND 0x40
#define DMPF_STRIPE_CACHE 0x80
-#define DMPF_REGION_SIZE 0X100
+#define DMPF_REGION_SIZE 0x100
+#define DMPF_RAID10_COPIES 0x200
+#define DMPF_RAID10_FORMAT 0x400
+
struct raid_set {
struct dm_target *ti;
@@ -76,6 +80,7 @@ static struct raid_type {
const unsigned algorithm; /* RAID algorithm. */
} raid_types[] = {
{"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */},
+ {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */},
{"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0},
{"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
{"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
@@ -86,6 +91,17 @@ static struct raid_type {
{"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE}
};
+static unsigned raid10_md_layout_to_copies(int layout)
+{
+ return layout & 0xFF;
+}
+
+static int raid10_format_to_md_layout(char *format, unsigned copies)
+{
+ /* 1 "far" copy, and 'copies' "near" copies */
+ return (1 << 8) | (copies & 0xFF);
+}
+
static struct raid_type *get_raid_type(char *name)
{
int i;
@@ -339,10 +355,16 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size)
* [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
* [stripe_cache <sectors>] Stripe cache size for higher RAIDs
* [region_size <sectors>] Defines granularity of bitmap
+ *
+ * RAID10-only options:
+ * [raid10_copies <# copies>] Number of copies. (Default: 2)
+ * [raid10_format <near>] Layout algorithm. (Default: near)
*/
static int parse_raid_params(struct raid_set *rs, char **argv,
unsigned num_raid_params)
{
+ char *raid10_format = "near";
+ unsigned raid10_copies = 2;
unsigned i, rebuild_cnt = 0;
unsigned long value, region_size = 0;
sector_t sectors_per_dev = rs->ti->len;
@@ -416,11 +438,28 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
}
key = argv[i++];
+
+ /* Parameters that take a string value are checked here. */
+ if (!strcasecmp(key, "raid10_format")) {
+ if (rs->raid_type->level != 10) {
+ rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
+ return -EINVAL;
+ }
+ if (strcmp("near", argv[i])) {
+ rs->ti->error = "Invalid 'raid10_format' value given";
+ return -EINVAL;
+ }
+ raid10_format = argv[i];
+ rs->print_flags |= DMPF_RAID10_FORMAT;
+ continue;
+ }
+
if (strict_strtoul(argv[i], 10, &value) < 0) {
rs->ti->error = "Bad numerical argument given in raid params";
return -EINVAL;
}
+ /* Parameters that take a numeric value are checked here */
if (!strcasecmp(key, "rebuild")) {
rebuild_cnt++;
@@ -439,6 +478,7 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
return -EINVAL;
}
break;
+ case 10:
default:
DMERR("The rebuild parameter is not supported for %s", rs->raid_type->name);
rs->ti->error = "Rebuild not supported for this RAID type";
@@ -495,7 +535,8 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
*/
value /= 2;
- if (rs->raid_type->level < 5) {
+ if ((rs->raid_type->level != 5) &&
+ (rs->raid_type->level != 6)) {
rs->ti->error = "Inappropriate argument: stripe_cache";
return -EINVAL;
}
@@ -520,6 +561,14 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
} else if (!strcasecmp(key, "region_size")) {
rs->print_flags |= DMPF_REGION_SIZE;
region_size = value;
+ } else if (!strcasecmp(key, "raid10_copies") &&
+ (rs->raid_type->level == 10)) {
+ if ((value < 2) || (value > 0xFF)) {
+ rs->ti->error = "Bad value for 'raid10_copies'";
+ return -EINVAL;
+ }
+ rs->print_flags |= DMPF_RAID10_COPIES;
+ raid10_copies = value;
} else {
DMERR("Unable to parse RAID parameter: %s", key);
rs->ti->error = "Unable to parse RAID parameters";
@@ -538,8 +587,22 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
if (dm_set_target_max_io_len(rs->ti, max_io_len))
return -EINVAL;
- if ((rs->raid_type->level > 1) &&
- sector_div(sectors_per_dev, (rs->md.raid_disks - rs->raid_type->parity_devs))) {
+ if (rs->raid_type->level == 10) {
+ if (raid10_copies > rs->md.raid_disks) {
+ rs->ti->error = "Not enough devices to satisfy specification";
+ return -EINVAL;
+ }
+
+ /* (Len * #mirrors) / #devices */
+ sectors_per_dev = rs->ti->len * raid10_copies;
+ sector_div(sectors_per_dev, rs->md.raid_disks);
+
+ rs->md.layout = raid10_format_to_md_layout(raid10_format,
+ raid10_copies);
+ rs->md.new_layout = rs->md.layout;
+ } else if ((rs->raid_type->level > 1) &&
+ sector_div(sectors_per_dev,
+ (rs->md.raid_disks - rs->raid_type->parity_devs))) {
rs->ti->error = "Target length not divisible by number of data devices";
return -EINVAL;
}
@@ -566,6 +629,9 @@ static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
if (rs->raid_type->level == 1)
return md_raid1_congested(&rs->md, bits);
+ if (rs->raid_type->level == 10)
+ return md_raid10_congested(&rs->md, bits);
+
return md_raid5_congested(&rs->md, bits);
}
@@ -884,6 +950,9 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
case 6:
redundancy = rs->raid_type->parity_devs;
break;
+ case 10:
+ redundancy = raid10_md_layout_to_copies(mddev->layout) - 1;
+ break;
default:
ti->error = "Unknown RAID type";
return -EINVAL;
@@ -1049,12 +1118,19 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
goto bad;
}
+ if (ti->len != rs->md.array_sectors) {
+ ti->error = "Array size does not match requested target length";
+ ret = -EINVAL;
+ goto size_mismatch;
+ }
rs->callbacks.congested_fn = raid_is_congested;
dm_table_add_target_callbacks(ti->table, &rs->callbacks);
mddev_suspend(&rs->md);
return 0;
+size_mismatch:
+ md_stop(&rs->md);
bad:
context_free(rs);
@@ -1203,6 +1279,13 @@ static int raid_status(struct dm_target *ti, status_type_t type,
DMEMIT(" region_size %lu",
rs->md.bitmap_info.chunksize >> 9);
+ if (rs->print_flags & DMPF_RAID10_COPIES)
+ DMEMIT(" raid10_copies %u",
+ raid10_md_layout_to_copies(rs->md.layout));
+
+ if (rs->print_flags & DMPF_RAID10_FORMAT)
+ DMEMIT(" raid10_format near");
+
DMEMIT(" %d", rs->md.raid_disks);
for (i = 0; i < rs->md.raid_disks; i++) {
if (rs->dev[i].meta_dev)
@@ -1277,7 +1360,7 @@ static void raid_resume(struct dm_target *ti)
static struct target_type raid_target = {
.name = "raid",
- .version = {1, 2, 0},
+ .version = {1, 3, 0},
.module = THIS_MODULE,
.ctr = raid_ctr,
.dtr = raid_dtr,
@@ -1304,6 +1387,8 @@ module_init(dm_raid_init);
module_exit(dm_raid_exit);
MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target");
+MODULE_ALIAS("dm-raid1");
+MODULE_ALIAS("dm-raid10");
MODULE_ALIAS("dm-raid4");
MODULE_ALIAS("dm-raid5");
MODULE_ALIAS("dm-raid6");
diff --git a/drivers/md/md.c b/drivers/md/md.c
index d5ab4493c8be..f6c46109b071 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3942,17 +3942,13 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
break;
case clear:
/* stopping an active array */
- if (atomic_read(&mddev->openers) > 0)
- return -EBUSY;
err = do_md_stop(mddev, 0, NULL);
break;
case inactive:
/* stopping an active array */
- if (mddev->pers) {
- if (atomic_read(&mddev->openers) > 0)
- return -EBUSY;
+ if (mddev->pers)
err = do_md_stop(mddev, 2, NULL);
- } else
+ else
err = 0; /* already inactive */
break;
case suspended:
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index cacd008d6864..197f62681db5 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -46,6 +46,20 @@
*/
#define NR_RAID1_BIOS 256
+/* when we get a read error on a read-only array, we redirect to another
+ * device without failing the first device, or trying to over-write to
+ * correct the read error. To keep track of bad blocks on a per-bio
+ * level, we store IO_BLOCKED in the appropriate 'bios' pointer
+ */
+#define IO_BLOCKED ((struct bio *)1)
+/* When we successfully write to a known bad-block, we need to remove the
+ * bad-block marking which must be done from process context. So we record
+ * the success by setting devs[n].bio to IO_MADE_GOOD
+ */
+#define IO_MADE_GOOD ((struct bio *)2)
+
+#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
+
/* When there are this many requests queue to be written by
* the raid1 thread, we become 'congested' to provide back-pressure
* for writeback.
@@ -483,12 +497,14 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
const sector_t this_sector = r1_bio->sector;
int sectors;
int best_good_sectors;
- int start_disk;
- int best_disk;
- int i;
+ int best_disk, best_dist_disk, best_pending_disk;
+ int has_nonrot_disk;
+ int disk;
sector_t best_dist;
+ unsigned int min_pending;
struct md_rdev *rdev;
int choose_first;
+ int choose_next_idle;
rcu_read_lock();
/*
@@ -499,26 +515,26 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
retry:
sectors = r1_bio->sectors;
best_disk = -1;
+ best_dist_disk = -1;
best_dist = MaxSector;
+ best_pending_disk = -1;
+ min_pending = UINT_MAX;
best_good_sectors = 0;
+ has_nonrot_disk = 0;
+ choose_next_idle = 0;
if (conf->mddev->recovery_cp < MaxSector &&
- (this_sector + sectors >= conf->next_resync)) {
+ (this_sector + sectors >= conf->next_resync))
choose_first = 1;
- start_disk = 0;
- } else {
+ else
choose_first = 0;
- start_disk = conf->last_used;
- }
- for (i = 0 ; i < conf->raid_disks * 2 ; i++) {
+ for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {
sector_t dist;
sector_t first_bad;
int bad_sectors;
-
- int disk = start_disk + i;
- if (disk >= conf->raid_disks * 2)
- disk -= conf->raid_disks * 2;
+ unsigned int pending;
+ bool nonrot;
rdev = rcu_dereference(conf->mirrors[disk].rdev);
if (r1_bio->bios[disk] == IO_BLOCKED
@@ -577,22 +593,77 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
} else
best_good_sectors = sectors;
+ nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev));
+ has_nonrot_disk |= nonrot;
+ pending = atomic_read(&rdev->nr_pending);
dist = abs(this_sector - conf->mirrors[disk].head_position);
- if (choose_first
- /* Don't change to another disk for sequential reads */
- || conf->next_seq_sect == this_sector
- || dist == 0
- /* If device is idle, use it */
- || atomic_read(&rdev->nr_pending) == 0) {
+ if (choose_first) {
+ best_disk = disk;
+ break;
+ }
+ /* Don't change to another disk for sequential reads */
+ if (conf->mirrors[disk].next_seq_sect == this_sector
+ || dist == 0) {
+ int opt_iosize = bdev_io_opt(rdev->bdev) >> 9;
+ struct raid1_info *mirror = &conf->mirrors[disk];
+
+ best_disk = disk;
+ /*
+ * If buffered sequential IO size exceeds optimal
+ * iosize, check if there is idle disk. If yes, choose
+ * the idle disk. read_balance could already choose an
+ * idle disk before noticing it's a sequential IO in
+ * this disk. This doesn't matter because this disk
+ * will idle, next time it will be utilized after the
+ * first disk has IO size exceeds optimal iosize. In
+ * this way, iosize of the first disk will be optimal
+ * iosize at least. iosize of the second disk might be
+ * small, but not a big deal since when the second disk
+ * starts IO, the first disk is likely still busy.
+ */
+ if (nonrot && opt_iosize > 0 &&
+ mirror->seq_start != MaxSector &&
+ mirror->next_seq_sect > opt_iosize &&
+ mirror->next_seq_sect - opt_iosize >=
+ mirror->seq_start) {
+ choose_next_idle = 1;
+ continue;
+ }
+ break;
+ }
+ /* If device is idle, use it */
+ if (pending == 0) {
best_disk = disk;
break;
}
+
+ if (choose_next_idle)
+ continue;
+
+ if (min_pending > pending) {
+ min_pending = pending;
+ best_pending_disk = disk;
+ }
+
if (dist < best_dist) {
best_dist = dist;
- best_disk = disk;
+ best_dist_disk = disk;
}
}
+ /*
+ * If all disks are rotational, choose the closest disk. If any disk is
+ * non-rotational, choose the disk with less pending request even the
+ * disk is rotational, which might/might not be optimal for raids with
+ * mixed ratation/non-rotational disks depending on workload.
+ */
+ if (best_disk == -1) {
+ if (has_nonrot_disk)
+ best_disk = best_pending_disk;
+ else
+ best_disk = best_dist_disk;
+ }
+
if (best_disk >= 0) {
rdev = rcu_dereference(conf->mirrors[best_disk].rdev);
if (!rdev)
@@ -606,8 +677,11 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
goto retry;
}
sectors = best_good_sectors;
- conf->next_seq_sect = this_sector + sectors;
- conf->last_used = best_disk;
+
+ if (conf->mirrors[best_disk].next_seq_sect != this_sector)
+ conf->mirrors[best_disk].seq_start = this_sector;
+
+ conf->mirrors[best_disk].next_seq_sect = this_sector + sectors;
}
rcu_read_unlock();
*max_sectors = sectors;
@@ -873,7 +947,7 @@ do_sync_io:
static void make_request(struct mddev *mddev, struct bio * bio)
{
struct r1conf *conf = mddev->private;
- struct mirror_info *mirror;
+ struct raid1_info *mirror;
struct r1bio *r1_bio;
struct bio *read_bio;
int i, disks;
@@ -1364,7 +1438,7 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
struct r1conf *conf = mddev->private;
int err = -EEXIST;
int mirror = 0;
- struct mirror_info *p;
+ struct raid1_info *p;
int first = 0;
int last = conf->raid_disks - 1;
struct request_queue *q = bdev_get_queue(rdev->bdev);
@@ -1433,7 +1507,7 @@ static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
struct r1conf *conf = mddev->private;
int err = 0;
int number = rdev->raid_disk;
- struct mirror_info *p = conf->mirrors+ number;
+ struct raid1_info *p = conf->mirrors + number;
if (rdev != p->rdev)
p = conf->mirrors + conf->raid_disks + number;
@@ -2371,6 +2445,18 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
bio->bi_rw = READ;
bio->bi_end_io = end_sync_read;
read_targets++;
+ } else if (!test_bit(WriteErrorSeen, &rdev->flags) &&
+ test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
+ !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
+ /*
+ * The device is suitable for reading (InSync),
+ * but has bad block(s) here. Let's try to correct them,
+ * if we are doing resync or repair. Otherwise, leave
+ * this device alone for this sync request.
+ */
+ bio->bi_rw = WRITE;
+ bio->bi_end_io = end_sync_write;
+ write_targets++;
}
}
if (bio->bi_end_io) {
@@ -2428,7 +2514,10 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
/* There is nowhere to write, so all non-sync
* drives must be failed - so we are finished
*/
- sector_t rv = max_sector - sector_nr;
+ sector_t rv;
+ if (min_bad > 0)
+ max_sector = sector_nr + min_bad;
+ rv = max_sector - sector_nr;
*skipped = 1;
put_buf(r1_bio);
return rv;
@@ -2521,7 +2610,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
{
struct r1conf *conf;
int i;
- struct mirror_info *disk;
+ struct raid1_info *disk;
struct md_rdev *rdev;
int err = -ENOMEM;
@@ -2529,7 +2618,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
if (!conf)
goto abort;
- conf->mirrors = kzalloc(sizeof(struct mirror_info)
+ conf->mirrors = kzalloc(sizeof(struct raid1_info)
* mddev->raid_disks * 2,
GFP_KERNEL);
if (!conf->mirrors)
@@ -2572,6 +2661,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
mddev->merge_check_needed = 1;
disk->head_position = 0;
+ disk->seq_start = MaxSector;
}
conf->raid_disks = mddev->raid_disks;
conf->mddev = mddev;
@@ -2585,7 +2675,6 @@ static struct r1conf *setup_conf(struct mddev *mddev)
conf->recovery_disabled = mddev->recovery_disabled - 1;
err = -EIO;
- conf->last_used = -1;
for (i = 0; i < conf->raid_disks * 2; i++) {
disk = conf->mirrors + i;
@@ -2611,19 +2700,9 @@ static struct r1conf *setup_conf(struct mddev *mddev)
if (disk->rdev &&
(disk->rdev->saved_raid_disk < 0))
conf->fullsync = 1;
- } else if (conf->last_used < 0)
- /*
- * The first working device is used as a
- * starting point to read balancing.
- */
- conf->last_used = i;
+ }
}
- if (conf->last_used < 0) {
- printk(KERN_ERR "md/raid1:%s: no operational mirrors\n",
- mdname(mddev));
- goto abort;
- }
err = -ENOMEM;
conf->thread = md_register_thread(raid1d, mddev, "raid1");
if (!conf->thread) {
@@ -2798,7 +2877,7 @@ static int raid1_reshape(struct mddev *mddev)
*/
mempool_t *newpool, *oldpool;
struct pool_info *newpoolinfo;
- struct mirror_info *newmirrors;
+ struct raid1_info *newmirrors;
struct r1conf *conf = mddev->private;
int cnt, raid_disks;
unsigned long flags;
@@ -2841,7 +2920,7 @@ static int raid1_reshape(struct mddev *mddev)
kfree(newpoolinfo);
return -ENOMEM;
}
- newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks * 2,
+ newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2,
GFP_KERNEL);
if (!newmirrors) {
kfree(newpoolinfo);
@@ -2880,7 +2959,6 @@ static int raid1_reshape(struct mddev *mddev)
conf->raid_disks = mddev->raid_disks = raid_disks;
mddev->delta_disks = 0;
- conf->last_used = 0; /* just make sure it is in-range */
lower_barrier(conf);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
index 80ded139314c..0ff3715fb7eb 100644
--- a/drivers/md/raid1.h
+++ b/drivers/md/raid1.h
@@ -1,9 +1,15 @@
#ifndef _RAID1_H
#define _RAID1_H
-struct mirror_info {
+struct raid1_info {
struct md_rdev *rdev;
sector_t head_position;
+
+ /* When choose the best device for a read (read_balance())
+ * we try to keep sequential reads one the same device
+ */
+ sector_t next_seq_sect;
+ sector_t seq_start;
};
/*
@@ -24,17 +30,11 @@ struct pool_info {
struct r1conf {
struct mddev *mddev;
- struct mirror_info *mirrors; /* twice 'raid_disks' to
+ struct raid1_info *mirrors; /* twice 'raid_disks' to
* allow for replacements.
*/
int raid_disks;
- /* When choose the best device for a read (read_balance())
- * we try to keep sequential reads one the same device
- * using 'last_used' and 'next_seq_sect'
- */
- int last_used;
- sector_t next_seq_sect;
/* During resync, read_balancing is only allowed on the part
* of the array that has been resynced. 'next_resync' tells us
* where that is.
@@ -135,20 +135,6 @@ struct r1bio {
/* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
};
-/* when we get a read error on a read-only array, we redirect to another
- * device without failing the first device, or trying to over-write to
- * correct the read error. To keep track of bad blocks on a per-bio
- * level, we store IO_BLOCKED in the appropriate 'bios' pointer
- */
-#define IO_BLOCKED ((struct bio *)1)
-/* When we successfully write to a known bad-block, we need to remove the
- * bad-block marking which must be done from process context. So we record
- * the success by setting bios[n] to IO_MADE_GOOD
- */
-#define IO_MADE_GOOD ((struct bio *)2)
-
-#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
-
/* bits for r1bio.state */
#define R1BIO_Uptodate 0
#define R1BIO_IsSync 1
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 8da6282254c3..e2549deab7c3 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -60,7 +60,21 @@
*/
#define NR_RAID10_BIOS 256
-/* When there are this many requests queue to be written by
+/* when we get a read error on a read-only array, we redirect to another
+ * device without failing the first device, or trying to over-write to
+ * correct the read error. To keep track of bad blocks on a per-bio
+ * level, we store IO_BLOCKED in the appropriate 'bios' pointer
+ */
+#define IO_BLOCKED ((struct bio *)1)
+/* When we successfully write to a known bad-block, we need to remove the
+ * bad-block marking which must be done from process context. So we record
+ * the success by setting devs[n].bio to IO_MADE_GOOD
+ */
+#define IO_MADE_GOOD ((struct bio *)2)
+
+#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
+
+/* When there are this many requests queued to be written by
* the raid10 thread, we become 'congested' to provide back-pressure
* for writeback.
*/
@@ -717,7 +731,7 @@ static struct md_rdev *read_balance(struct r10conf *conf,
int sectors = r10_bio->sectors;
int best_good_sectors;
sector_t new_distance, best_dist;
- struct md_rdev *rdev, *best_rdev;
+ struct md_rdev *best_rdev, *rdev = NULL;
int do_balance;
int best_slot;
struct geom *geo = &conf->geo;
@@ -839,9 +853,8 @@ retry:
return rdev;
}
-static int raid10_congested(void *data, int bits)
+int md_raid10_congested(struct mddev *mddev, int bits)
{
- struct mddev *mddev = data;
struct r10conf *conf = mddev->private;
int i, ret = 0;
@@ -849,8 +862,6 @@ static int raid10_congested(void *data, int bits)
conf->pending_count >= max_queued_requests)
return 1;
- if (mddev_congested(mddev, bits))
- return 1;
rcu_read_lock();
for (i = 0;
(i < conf->geo.raid_disks || i < conf->prev.raid_disks)
@@ -866,6 +877,15 @@ static int raid10_congested(void *data, int bits)
rcu_read_unlock();
return ret;
}
+EXPORT_SYMBOL_GPL(md_raid10_congested);
+
+static int raid10_congested(void *data, int bits)
+{
+ struct mddev *mddev = data;
+
+ return mddev_congested(mddev, bits) ||
+ md_raid10_congested(mddev, bits);
+}
static void flush_pending_writes(struct r10conf *conf)
{
@@ -1546,7 +1566,7 @@ static void error(struct mddev *mddev, struct md_rdev *rdev)
static void print_conf(struct r10conf *conf)
{
int i;
- struct mirror_info *tmp;
+ struct raid10_info *tmp;
printk(KERN_DEBUG "RAID10 conf printout:\n");
if (!conf) {
@@ -1580,7 +1600,7 @@ static int raid10_spare_active(struct mddev *mddev)
{
int i;
struct r10conf *conf = mddev->private;
- struct mirror_info *tmp;
+ struct raid10_info *tmp;
int count = 0;
unsigned long flags;
@@ -1655,7 +1675,7 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
else
mirror = first;
for ( ; mirror <= last ; mirror++) {
- struct mirror_info *p = &conf->mirrors[mirror];
+ struct raid10_info *p = &conf->mirrors[mirror];
if (p->recovery_disabled == mddev->recovery_disabled)
continue;
if (p->rdev) {
@@ -1709,7 +1729,7 @@ static int raid10_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
int err = 0;
int number = rdev->raid_disk;
struct md_rdev **rdevp;
- struct mirror_info *p = conf->mirrors + number;
+ struct raid10_info *p = conf->mirrors + number;
print_conf(conf);
if (rdev == p->rdev)
@@ -2876,7 +2896,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
sector_t sect;
int must_sync;
int any_working;
- struct mirror_info *mirror = &conf->mirrors[i];
+ struct raid10_info *mirror = &conf->mirrors[i];
if ((mirror->rdev == NULL ||
test_bit(In_sync, &mirror->rdev->flags))
@@ -3388,7 +3408,7 @@ static struct r10conf *setup_conf(struct mddev *mddev)
goto out;
/* FIXME calc properly */
- conf->mirrors = kzalloc(sizeof(struct mirror_info)*(mddev->raid_disks +
+ conf->mirrors = kzalloc(sizeof(struct raid10_info)*(mddev->raid_disks +
max(0,mddev->delta_disks)),
GFP_KERNEL);
if (!conf->mirrors)
@@ -3452,7 +3472,7 @@ static int run(struct mddev *mddev)
{
struct r10conf *conf;
int i, disk_idx, chunk_size;
- struct mirror_info *disk;
+ struct raid10_info *disk;
struct md_rdev *rdev;
sector_t size;
sector_t min_offset_diff = 0;
@@ -3472,12 +3492,14 @@ static int run(struct mddev *mddev)
conf->thread = NULL;
chunk_size = mddev->chunk_sectors << 9;
- blk_queue_io_min(mddev->queue, chunk_size);
- if (conf->geo.raid_disks % conf->geo.near_copies)
- blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);
- else
- blk_queue_io_opt(mddev->queue, chunk_size *
- (conf->geo.raid_disks / conf->geo.near_copies));
+ if (mddev->queue) {
+ blk_queue_io_min(mddev->queue, chunk_size);
+ if (conf->geo.raid_disks % conf->geo.near_copies)
+ blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);
+ else
+ blk_queue_io_opt(mddev->queue, chunk_size *
+ (conf->geo.raid_disks / conf->geo.near_copies));
+ }
rdev_for_each(rdev, mddev) {
long long diff;
@@ -3511,8 +3533,9 @@ static int run(struct mddev *mddev)
if (first || diff < min_offset_diff)
min_offset_diff = diff;
- disk_stack_limits(mddev->gendisk, rdev->bdev,
- rdev->data_offset << 9);
+ if (mddev->gendisk)
+ disk_stack_limits(mddev->gendisk, rdev->bdev,
+ rdev->data_offset << 9);
disk->head_position = 0;
}
@@ -3575,22 +3598,22 @@ static int run(struct mddev *mddev)
md_set_array_sectors(mddev, size);
mddev->resync_max_sectors = size;
- mddev->queue->backing_dev_info.congested_fn = raid10_congested;
- mddev->queue->backing_dev_info.congested_data = mddev;
-
- /* Calculate max read-ahead size.
- * We need to readahead at least twice a whole stripe....
- * maybe...
- */
- {
+ if (mddev->queue) {
int stripe = conf->geo.raid_disks *
((mddev->chunk_sectors << 9) / PAGE_SIZE);
+ mddev->queue->backing_dev_info.congested_fn = raid10_congested;
+ mddev->queue->backing_dev_info.congested_data = mddev;
+
+ /* Calculate max read-ahead size.
+ * We need to readahead at least twice a whole stripe....
+ * maybe...
+ */
stripe /= conf->geo.near_copies;
if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
+ blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
}
- blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
if (md_integrity_register(mddev))
goto out_free_conf;
@@ -3641,7 +3664,10 @@ static int stop(struct mddev *mddev)
lower_barrier(conf);
md_unregister_thread(&mddev->thread);
- blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
+ if (mddev->queue)
+ /* the unplug fn references 'conf'*/
+ blk_sync_queue(mddev->queue);
+
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
kfree(conf->mirrors);
@@ -3805,7 +3831,7 @@ static int raid10_check_reshape(struct mddev *mddev)
if (mddev->delta_disks > 0) {
/* allocate new 'mirrors' list */
conf->mirrors_new = kzalloc(
- sizeof(struct mirror_info)
+ sizeof(struct raid10_info)
*(mddev->raid_disks +
mddev->delta_disks),
GFP_KERNEL);
@@ -3930,7 +3956,7 @@ static int raid10_start_reshape(struct mddev *mddev)
spin_lock_irq(&conf->device_lock);
if (conf->mirrors_new) {
memcpy(conf->mirrors_new, conf->mirrors,
- sizeof(struct mirror_info)*conf->prev.raid_disks);
+ sizeof(struct raid10_info)*conf->prev.raid_disks);
smp_mb();
kfree(conf->mirrors_old); /* FIXME and elsewhere */
conf->mirrors_old = conf->mirrors;
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 135b1b0a1554..007c2c68dd83 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -1,7 +1,7 @@
#ifndef _RAID10_H
#define _RAID10_H
-struct mirror_info {
+struct raid10_info {
struct md_rdev *rdev, *replacement;
sector_t head_position;
int recovery_disabled; /* matches
@@ -13,8 +13,8 @@ struct mirror_info {
struct r10conf {
struct mddev *mddev;
- struct mirror_info *mirrors;
- struct mirror_info *mirrors_new, *mirrors_old;
+ struct raid10_info *mirrors;
+ struct raid10_info *mirrors_new, *mirrors_old;
spinlock_t device_lock;
/* geometry */
@@ -123,20 +123,6 @@ struct r10bio {
} devs[0];
};
-/* when we get a read error on a read-only array, we redirect to another
- * device without failing the first device, or trying to over-write to
- * correct the read error. To keep track of bad blocks on a per-bio
- * level, we store IO_BLOCKED in the appropriate 'bios' pointer
- */
-#define IO_BLOCKED ((struct bio*)1)
-/* When we successfully write to a known bad-block, we need to remove the
- * bad-block marking which must be done from process context. So we record
- * the success by setting devs[n].bio to IO_MADE_GOOD
- */
-#define IO_MADE_GOOD ((struct bio *)2)
-
-#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
-
/* bits for r10bio.state */
enum r10bio_state {
R10BIO_Uptodate,
@@ -159,4 +145,7 @@ enum r10bio_state {
*/
R10BIO_Previous,
};
+
+extern int md_raid10_congested(struct mddev *mddev, int bits);
+
#endif
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 04348d76bb30..259f519814ca 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -99,34 +99,40 @@ static inline struct bio *r5_next_bio(struct bio *bio, sector_t sector)
* We maintain a biased count of active stripes in the bottom 16 bits of
* bi_phys_segments, and a count of processed stripes in the upper 16 bits
*/
-static inline int raid5_bi_phys_segments(struct bio *bio)
+static inline int raid5_bi_processed_stripes(struct bio *bio)
{
- return bio->bi_phys_segments & 0xffff;
+ atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
+ return (atomic_read(segments) >> 16) & 0xffff;
}
-static inline int raid5_bi_hw_segments(struct bio *bio)
+static inline int raid5_dec_bi_active_stripes(struct bio *bio)
{
- return (bio->bi_phys_segments >> 16) & 0xffff;
+ atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
+ return atomic_sub_return(1, segments) & 0xffff;
}
-static inline int raid5_dec_bi_phys_segments(struct bio *bio)
+static inline void raid5_inc_bi_active_stripes(struct bio *bio)
{
- --bio->bi_phys_segments;
- return raid5_bi_phys_segments(bio);
+ atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
+ atomic_inc(segments);
}
-static inline int raid5_dec_bi_hw_segments(struct bio *bio)
+static inline void raid5_set_bi_processed_stripes(struct bio *bio,
+ unsigned int cnt)
{
- unsigned short val = raid5_bi_hw_segments(bio);
+ atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
+ int old, new;
- --val;
- bio->bi_phys_segments = (val << 16) | raid5_bi_phys_segments(bio);
- return val;
+ do {
+ old = atomic_read(segments);
+ new = (old & 0xffff) | (cnt << 16);
+ } while (atomic_cmpxchg(segments, old, new) != old);
}
-static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt)
+static inline void raid5_set_bi_stripes(struct bio *bio, unsigned int cnt)
{
- bio->bi_phys_segments = raid5_bi_phys_segments(bio) | (cnt << 16);
+ atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
+ atomic_set(segments, cnt);
}
/* Find first data disk in a raid6 stripe */
@@ -190,49 +196,56 @@ static int stripe_operations_active(struct stripe_head *sh)
test_bit(STRIPE_COMPUTE_RUN, &sh->state);
}
-static void __release_stripe(struct r5conf *conf, struct stripe_head *sh)
+static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh)
{
- if (atomic_dec_and_test(&sh->count)) {
- BUG_ON(!list_empty(&sh->lru));
- BUG_ON(atomic_read(&conf->active_stripes)==0);
- if (test_bit(STRIPE_HANDLE, &sh->state)) {
- if (test_bit(STRIPE_DELAYED, &sh->state) &&
- !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
- list_add_tail(&sh->lru, &conf->delayed_list);
- else if (test_bit(STRIPE_BIT_DELAY, &sh->state) &&
- sh->bm_seq - conf->seq_write > 0)
- list_add_tail(&sh->lru, &conf->bitmap_list);
- else {
- clear_bit(STRIPE_DELAYED, &sh->state);
- clear_bit(STRIPE_BIT_DELAY, &sh->state);
- list_add_tail(&sh->lru, &conf->handle_list);
- }
- md_wakeup_thread(conf->mddev->thread);
- } else {
- BUG_ON(stripe_operations_active(sh));
- if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
- if (atomic_dec_return(&conf->preread_active_stripes)
- < IO_THRESHOLD)
- md_wakeup_thread(conf->mddev->thread);
- atomic_dec(&conf->active_stripes);
- if (!test_bit(STRIPE_EXPANDING, &sh->state)) {
- list_add_tail(&sh->lru, &conf->inactive_list);
- wake_up(&conf->wait_for_stripe);
- if (conf->retry_read_aligned)
- md_wakeup_thread(conf->mddev->thread);
- }
+ BUG_ON(!list_empty(&sh->lru));
+ BUG_ON(atomic_read(&conf->active_stripes)==0);
+ if (test_bit(STRIPE_HANDLE, &sh->state)) {
+ if (test_bit(STRIPE_DELAYED, &sh->state) &&
+ !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
+ list_add_tail(&sh->lru, &conf->delayed_list);
+ else if (test_bit(STRIPE_BIT_DELAY, &sh->state) &&
+ sh->bm_seq - conf->seq_write > 0)
+ list_add_tail(&sh->lru, &conf->bitmap_list);
+ else {
+ clear_bit(STRIPE_DELAYED, &sh->state);
+ clear_bit(STRIPE_BIT_DELAY, &sh->state);
+ list_add_tail(&sh->lru, &conf->handle_list);
+ }
+ md_wakeup_thread(conf->mddev->thread);
+ } else {
+ BUG_ON(stripe_operations_active(sh));
+ if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
+ if (atomic_dec_return(&conf->preread_active_stripes)
+ < IO_THRESHOLD)
+ md_wakeup_thread(conf->mddev->thread);
+ atomic_dec(&conf->active_stripes);
+ if (!test_bit(STRIPE_EXPANDING, &sh->state)) {
+ list_add_tail(&sh->lru, &conf->inactive_list);
+ wake_up(&conf->wait_for_stripe);
+ if (conf->retry_read_aligned)
+ md_wakeup_thread(conf->mddev->thread);
}
}
}
+static void __release_stripe(struct r5conf *conf, struct stripe_head *sh)
+{
+ if (atomic_dec_and_test(&sh->count))
+ do_release_stripe(conf, sh);
+}
+
static void release_stripe(struct stripe_head *sh)
{
struct r5conf *conf = sh->raid_conf;
unsigned long flags;
- spin_lock_irqsave(&conf->device_lock, flags);
- __release_stripe(conf, sh);
- spin_unlock_irqrestore(&conf->device_lock, flags);
+ local_irq_save(flags);
+ if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) {
+ do_release_stripe(conf, sh);
+ spin_unlock(&conf->device_lock);
+ }
+ local_irq_restore(flags);
}
static inline void remove_hash(struct stripe_head *sh)
@@ -640,6 +653,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
else
bi->bi_sector = (sh->sector
+ rdev->data_offset);
+ if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
+ bi->bi_rw |= REQ_FLUSH;
+
bi->bi_flags = 1 << BIO_UPTODATE;
bi->bi_idx = 0;
bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
@@ -749,14 +765,12 @@ static void ops_complete_biofill(void *stripe_head_ref)
{
struct stripe_head *sh = stripe_head_ref;
struct bio *return_bi = NULL;
- struct r5conf *conf = sh->raid_conf;
int i;
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
/* clear completed biofills */
- spin_lock_irq(&conf->device_lock);
for (i = sh->disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
@@ -774,7 +788,7 @@ static void ops_complete_biofill(void *stripe_head_ref)
while (rbi && rbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
rbi2 = r5_next_bio(rbi, dev->sector);
- if (!raid5_dec_bi_phys_segments(rbi)) {
+ if (!raid5_dec_bi_active_stripes(rbi)) {
rbi->bi_next = return_bi;
return_bi = rbi;
}
@@ -782,7 +796,6 @@ static void ops_complete_biofill(void *stripe_head_ref)
}
}
}
- spin_unlock_irq(&conf->device_lock);
clear_bit(STRIPE_BIOFILL_RUN, &sh->state);
return_io(return_bi);
@@ -794,7 +807,6 @@ static void ops_complete_biofill(void *stripe_head_ref)
static void ops_run_biofill(struct stripe_head *sh)
{
struct dma_async_tx_descriptor *tx = NULL;
- struct r5conf *conf = sh->raid_conf;
struct async_submit_ctl submit;
int i;
@@ -805,10 +817,10 @@ static void ops_run_biofill(struct stripe_head *sh)
struct r5dev *dev = &sh->dev[i];
if (test_bit(R5_Wantfill, &dev->flags)) {
struct bio *rbi;
- spin_lock_irq(&conf->device_lock);
+ spin_lock_irq(&sh->stripe_lock);
dev->read = rbi = dev->toread;
dev->toread = NULL;
- spin_unlock_irq(&conf->device_lock);
+ spin_unlock_irq(&sh->stripe_lock);
while (rbi && rbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
tx = async_copy_data(0, rbi, dev->page,
@@ -1144,12 +1156,12 @@ ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx)
if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) {
struct bio *wbi;
- spin_lock_irq(&sh->raid_conf->device_lock);
+ spin_lock_irq(&sh->stripe_lock);
chosen = dev->towrite;
dev->towrite = NULL;
BUG_ON(dev->written);
wbi = dev->written = chosen;
- spin_unlock_irq(&sh->raid_conf->device_lock);
+ spin_unlock_irq(&sh->stripe_lock);
while (wbi && wbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
@@ -1454,6 +1466,8 @@ static int grow_one_stripe(struct r5conf *conf)
init_waitqueue_head(&sh->ops.wait_for_ops);
#endif
+ spin_lock_init(&sh->stripe_lock);
+
if (grow_buffers(sh)) {
shrink_buffers(sh);
kmem_cache_free(conf->slab_cache, sh);
@@ -1739,7 +1753,9 @@ static void raid5_end_read_request(struct bio * bi, int error)
atomic_add(STRIPE_SECTORS, &rdev->corrected_errors);
clear_bit(R5_ReadError, &sh->dev[i].flags);
clear_bit(R5_ReWrite, &sh->dev[i].flags);
- }
+ } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
+ clear_bit(R5_ReadNoMerge, &sh->dev[i].flags);
+
if (atomic_read(&rdev->read_errors))
atomic_set(&rdev->read_errors, 0);
} else {
@@ -1784,7 +1800,11 @@ static void raid5_end_read_request(struct bio * bi, int error)
else
retry = 1;
if (retry)
- set_bit(R5_ReadError, &sh->dev[i].flags);
+ if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) {
+ set_bit(R5_ReadError, &sh->dev[i].flags);
+ clear_bit(R5_ReadNoMerge, &sh->dev[i].flags);
+ } else
+ set_bit(R5_ReadNoMerge, &sh->dev[i].flags);
else {
clear_bit(R5_ReadError, &sh->dev[i].flags);
clear_bit(R5_ReWrite, &sh->dev[i].flags);
@@ -2340,11 +2360,18 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
(unsigned long long)bi->bi_sector,
(unsigned long long)sh->sector);
-
- spin_lock_irq(&conf->device_lock);
+ /*
+ * If several bio share a stripe. The bio bi_phys_segments acts as a
+ * reference count to avoid race. The reference count should already be
+ * increased before this function is called (for example, in
+ * make_request()), so other bio sharing this stripe will not free the
+ * stripe. If a stripe is owned by one stripe, the stripe lock will
+ * protect it.
+ */
+ spin_lock_irq(&sh->stripe_lock);
if (forwrite) {
bip = &sh->dev[dd_idx].towrite;
- if (*bip == NULL && sh->dev[dd_idx].written == NULL)
+ if (*bip == NULL)
firstwrite = 1;
} else
bip = &sh->dev[dd_idx].toread;
@@ -2360,7 +2387,7 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
if (*bip)
bi->bi_next = *bip;
*bip = bi;
- bi->bi_phys_segments++;
+ raid5_inc_bi_active_stripes(bi);
if (forwrite) {
/* check if page is covered */
@@ -2375,7 +2402,7 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS)
set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags);
}
- spin_unlock_irq(&conf->device_lock);
+ spin_unlock_irq(&sh->stripe_lock);
pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
(unsigned long long)(*bip)->bi_sector,
@@ -2391,7 +2418,7 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
overlap:
set_bit(R5_Overlap, &sh->dev[dd_idx].flags);
- spin_unlock_irq(&conf->device_lock);
+ spin_unlock_irq(&sh->stripe_lock);
return 0;
}
@@ -2441,10 +2468,11 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
rdev_dec_pending(rdev, conf->mddev);
}
}
- spin_lock_irq(&conf->device_lock);
+ spin_lock_irq(&sh->stripe_lock);
/* fail all writes first */
bi = sh->dev[i].towrite;
sh->dev[i].towrite = NULL;
+ spin_unlock_irq(&sh->stripe_lock);
if (bi) {
s->to_write--;
bitmap_end = 1;
@@ -2457,13 +2485,17 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
- if (!raid5_dec_bi_phys_segments(bi)) {
+ if (!raid5_dec_bi_active_stripes(bi)) {
md_write_end(conf->mddev);
bi->bi_next = *return_bi;
*return_bi = bi;
}
bi = nextbi;
}
+ if (bitmap_end)
+ bitmap_endwrite(conf->mddev->bitmap, sh->sector,
+ STRIPE_SECTORS, 0, 0);
+ bitmap_end = 0;
/* and fail all 'written' */
bi = sh->dev[i].written;
sh->dev[i].written = NULL;
@@ -2472,7 +2504,7 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
- if (!raid5_dec_bi_phys_segments(bi)) {
+ if (!raid5_dec_bi_active_stripes(bi)) {
md_write_end(conf->mddev);
bi->bi_next = *return_bi;
*return_bi = bi;
@@ -2496,14 +2528,13 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
struct bio *nextbi =
r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
- if (!raid5_dec_bi_phys_segments(bi)) {
+ if (!raid5_dec_bi_active_stripes(bi)) {
bi->bi_next = *return_bi;
*return_bi = bi;
}
bi = nextbi;
}
}
- spin_unlock_irq(&conf->device_lock);
if (bitmap_end)
bitmap_endwrite(conf->mddev->bitmap, sh->sector,
STRIPE_SECTORS, 0, 0);
@@ -2707,30 +2738,23 @@ static void handle_stripe_clean_event(struct r5conf *conf,
test_bit(R5_UPTODATE, &dev->flags)) {
/* We can return any write requests */
struct bio *wbi, *wbi2;
- int bitmap_end = 0;
pr_debug("Return write for disc %d\n", i);
- spin_lock_irq(&conf->device_lock);
wbi = dev->written;
dev->written = NULL;
while (wbi && wbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
wbi2 = r5_next_bio(wbi, dev->sector);
- if (!raid5_dec_bi_phys_segments(wbi)) {
+ if (!raid5_dec_bi_active_stripes(wbi)) {
md_write_end(conf->mddev);
wbi->bi_next = *return_bi;
*return_bi = wbi;
}
wbi = wbi2;
}
- if (dev->towrite == NULL)
- bitmap_end = 1;
- spin_unlock_irq(&conf->device_lock);
- if (bitmap_end)
- bitmap_endwrite(conf->mddev->bitmap,
- sh->sector,
- STRIPE_SECTORS,
+ bitmap_endwrite(conf->mddev->bitmap, sh->sector,
+ STRIPE_SECTORS,
!test_bit(STRIPE_DEGRADED, &sh->state),
- 0);
+ 0);
}
}
@@ -3182,7 +3206,6 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
/* Now to look around and see what can be done */
rcu_read_lock();
- spin_lock_irq(&conf->device_lock);
for (i=disks; i--; ) {
struct md_rdev *rdev;
sector_t first_bad;
@@ -3328,7 +3351,6 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
do_recovery = 1;
}
}
- spin_unlock_irq(&conf->device_lock);
if (test_bit(STRIPE_SYNCING, &sh->state)) {
/* If there is a failed device being replaced,
* we must be recovering.
@@ -3791,7 +3813,7 @@ static struct bio *remove_bio_from_retry(struct r5conf *conf)
* this sets the active strip count to 1 and the processed
* strip count to zero (upper 8 bits)
*/
- bi->bi_phys_segments = 1; /* biased count of active stripes */
+ raid5_set_bi_stripes(bi, 1); /* biased count of active stripes */
}
return bi;
@@ -4113,7 +4135,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
finish_wait(&conf->wait_for_overlap, &w);
set_bit(STRIPE_HANDLE, &sh->state);
clear_bit(STRIPE_DELAYED, &sh->state);
- if ((bi->bi_rw & REQ_SYNC) &&
+ if ((bi->bi_rw & REQ_NOIDLE) &&
!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
atomic_inc(&conf->preread_active_stripes);
mddev_check_plugged(mddev);
@@ -4126,9 +4148,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
}
}
- spin_lock_irq(&conf->device_lock);
- remaining = raid5_dec_bi_phys_segments(bi);
- spin_unlock_irq(&conf->device_lock);
+ remaining = raid5_dec_bi_active_stripes(bi);
if (remaining == 0) {
if ( rw == WRITE )
@@ -4484,7 +4504,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
sector += STRIPE_SECTORS,
scnt++) {
- if (scnt < raid5_bi_hw_segments(raid_bio))
+ if (scnt < raid5_bi_processed_stripes(raid_bio))
/* already done this stripe */
continue;
@@ -4492,25 +4512,24 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
if (!sh) {
/* failed to get a stripe - must wait */
- raid5_set_bi_hw_segments(raid_bio, scnt);
+ raid5_set_bi_processed_stripes(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
return handled;
}
if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) {
release_stripe(sh);
- raid5_set_bi_hw_segments(raid_bio, scnt);
+ raid5_set_bi_processed_stripes(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
return handled;
}
+ set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags);
handle_stripe(sh);
release_stripe(sh);
handled++;
}
- spin_lock_irq(&conf->device_lock);
- remaining = raid5_dec_bi_phys_segments(raid_bio);
- spin_unlock_irq(&conf->device_lock);
+ remaining = raid5_dec_bi_active_stripes(raid_bio);
if (remaining == 0)
bio_endio(raid_bio, 0);
if (atomic_dec_and_test(&conf->active_aligned_reads))
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 2164021f3b5f..61dbb615c30b 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -210,6 +210,7 @@ struct stripe_head {
int disks; /* disks in stripe */
enum check_states check_state;
enum reconstruct_states reconstruct_state;
+ spinlock_t stripe_lock;
/**
* struct stripe_operations
* @target - STRIPE_OP_COMPUTE_BLK target
@@ -273,6 +274,7 @@ enum r5dev_flags {
R5_Wantwrite,
R5_Overlap, /* There is a pending overlapping request
* on this block */
+ R5_ReadNoMerge, /* prevent bio from merging in block-layer */
R5_ReadError, /* seen a read error here recently */
R5_ReWrite, /* have tried to over-write the readerror */