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-rw-r--r--drivers/md/Kconfig24
-rw-r--r--drivers/md/bitmap.c47
-rw-r--r--drivers/md/dm-crypt.c486
-rw-r--r--drivers/md/dm-exception-store.c2
-rw-r--r--drivers/md/dm-ioctl.c32
-rw-r--r--drivers/md/dm-log.c51
-rw-r--r--drivers/md/dm-mpath.c2
-rw-r--r--drivers/md/dm-raid1.c664
-rw-r--r--drivers/md/dm-snap.c95
-rw-r--r--drivers/md/dm-snap.h50
-rw-r--r--drivers/md/dm-stripe.c105
-rw-r--r--drivers/md/dm-table.c24
-rw-r--r--drivers/md/dm.c238
-rw-r--r--drivers/md/faulty.c2
-rw-r--r--drivers/md/linear.c2
-rw-r--r--drivers/md/md.c398
-rw-r--r--drivers/md/mktables.c187
-rw-r--r--drivers/md/multipath.c2
-rw-r--r--drivers/md/raid0.c8
-rw-r--r--drivers/md/raid1.c5
-rw-r--r--drivers/md/raid10.c7
-rw-r--r--drivers/md/raid5.c48
-rw-r--r--drivers/md/raid6test/test.c117
23 files changed, 1907 insertions, 689 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 3fa7c77d9bd9..610af916891e 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -204,7 +204,7 @@ config BLK_DEV_DM
config DM_DEBUG
boolean "Device mapper debugging support"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ depends on BLK_DEV_DM
---help---
Enable this for messages that may help debug device-mapper problems.
@@ -212,7 +212,7 @@ config DM_DEBUG
config DM_CRYPT
tristate "Crypt target support"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ depends on BLK_DEV_DM
select CRYPTO
select CRYPTO_CBC
---help---
@@ -230,34 +230,34 @@ config DM_CRYPT
If unsure, say N.
config DM_SNAPSHOT
- tristate "Snapshot target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Snapshot target"
+ depends on BLK_DEV_DM
---help---
Allow volume managers to take writable snapshots of a device.
config DM_MIRROR
- tristate "Mirror target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Mirror target"
+ depends on BLK_DEV_DM
---help---
Allow volume managers to mirror logical volumes, also
needed for live data migration tools such as 'pvmove'.
config DM_ZERO
- tristate "Zero target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Zero target"
+ depends on BLK_DEV_DM
---help---
A target that discards writes, and returns all zeroes for
reads. Useful in some recovery situations.
config DM_MULTIPATH
- tristate "Multipath target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Multipath target"
+ depends on BLK_DEV_DM
---help---
Allow volume managers to support multipath hardware.
config DM_MULTIPATH_EMC
- tristate "EMC CX/AX multipath support (EXPERIMENTAL)"
- depends on DM_MULTIPATH && BLK_DEV_DM && EXPERIMENTAL
+ tristate "EMC CX/AX multipath support"
+ depends on DM_MULTIPATH && BLK_DEV_DM
---help---
Multipath support for EMC CX/AX series hardware.
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 1b1ef3130e6e..7aeceedcf7d4 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -206,16 +206,10 @@ static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page)
/* copy the pathname of a file to a buffer */
char *file_path(struct file *file, char *buf, int count)
{
- struct dentry *d;
- struct vfsmount *v;
-
if (!buf)
return NULL;
- d = file->f_path.dentry;
- v = file->f_path.mnt;
-
- buf = d_path(d, v, buf, count);
+ buf = d_path(&file->f_path, buf, count);
return IS_ERR(buf) ? NULL : buf;
}
@@ -237,7 +231,7 @@ static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long inde
if (!page)
return ERR_PTR(-ENOMEM);
- ITERATE_RDEV(mddev, rdev, tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (! test_bit(In_sync, &rdev->flags)
|| test_bit(Faulty, &rdev->flags))
continue;
@@ -261,7 +255,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
struct list_head *tmp;
mddev_t *mddev = bitmap->mddev;
- ITERATE_RDEV(mddev, rdev, tmp)
+ rdev_for_each(rdev, tmp, mddev)
if (test_bit(In_sync, &rdev->flags)
&& !test_bit(Faulty, &rdev->flags)) {
int size = PAGE_SIZE;
@@ -1348,14 +1342,38 @@ void bitmap_close_sync(struct bitmap *bitmap)
*/
sector_t sector = 0;
int blocks;
- if (!bitmap) return;
+ if (!bitmap)
+ return;
while (sector < bitmap->mddev->resync_max_sectors) {
bitmap_end_sync(bitmap, sector, &blocks, 0);
-/*
- if (sector < 500) printk("bitmap_close_sync: sec %llu blks %d\n",
- (unsigned long long)sector, blocks);
-*/ sector += blocks;
+ sector += blocks;
+ }
+}
+
+void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector)
+{
+ sector_t s = 0;
+ int blocks;
+
+ if (!bitmap)
+ return;
+ if (sector == 0) {
+ bitmap->last_end_sync = jiffies;
+ return;
+ }
+ if (time_before(jiffies, (bitmap->last_end_sync
+ + bitmap->daemon_sleep * HZ)))
+ return;
+ wait_event(bitmap->mddev->recovery_wait,
+ atomic_read(&bitmap->mddev->recovery_active) == 0);
+
+ sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1);
+ s = 0;
+ while (s < sector && s < bitmap->mddev->resync_max_sectors) {
+ bitmap_end_sync(bitmap, s, &blocks, 0);
+ s += blocks;
}
+ bitmap->last_end_sync = jiffies;
}
static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
@@ -1565,3 +1583,4 @@ EXPORT_SYMBOL(bitmap_start_sync);
EXPORT_SYMBOL(bitmap_end_sync);
EXPORT_SYMBOL(bitmap_unplug);
EXPORT_SYMBOL(bitmap_close_sync);
+EXPORT_SYMBOL(bitmap_cond_end_sync);
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 6b66ee46b87d..b04f98df94ea 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1,11 +1,12 @@
/*
* Copyright (C) 2003 Christophe Saout <christophe@saout.de>
* Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
+#include <linux/completion.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -28,20 +29,10 @@
#define MESG_STR(x) x, sizeof(x)
/*
- * per bio private data
- */
-struct dm_crypt_io {
- struct dm_target *target;
- struct bio *base_bio;
- struct work_struct work;
- atomic_t pending;
- int error;
-};
-
-/*
* context holding the current state of a multi-part conversion
*/
struct convert_context {
+ struct completion restart;
struct bio *bio_in;
struct bio *bio_out;
unsigned int offset_in;
@@ -49,7 +40,27 @@ struct convert_context {
unsigned int idx_in;
unsigned int idx_out;
sector_t sector;
- int write;
+ atomic_t pending;
+};
+
+/*
+ * per bio private data
+ */
+struct dm_crypt_io {
+ struct dm_target *target;
+ struct bio *base_bio;
+ struct work_struct work;
+
+ struct convert_context ctx;
+
+ atomic_t pending;
+ int error;
+ sector_t sector;
+};
+
+struct dm_crypt_request {
+ struct scatterlist sg_in;
+ struct scatterlist sg_out;
};
struct crypt_config;
@@ -72,10 +83,11 @@ struct crypt_config {
sector_t start;
/*
- * pool for per bio private data and
- * for encryption buffer pages
+ * pool for per bio private data, crypto requests and
+ * encryption requeusts/buffer pages
*/
mempool_t *io_pool;
+ mempool_t *req_pool;
mempool_t *page_pool;
struct bio_set *bs;
@@ -93,9 +105,25 @@ struct crypt_config {
sector_t iv_offset;
unsigned int iv_size;
+ /*
+ * Layout of each crypto request:
+ *
+ * struct ablkcipher_request
+ * context
+ * padding
+ * struct dm_crypt_request
+ * padding
+ * IV
+ *
+ * The padding is added so that dm_crypt_request and the IV are
+ * correctly aligned.
+ */
+ unsigned int dmreq_start;
+ struct ablkcipher_request *req;
+
char cipher[CRYPTO_MAX_ALG_NAME];
char chainmode[CRYPTO_MAX_ALG_NAME];
- struct crypto_blkcipher *tfm;
+ struct crypto_ablkcipher *tfm;
unsigned long flags;
unsigned int key_size;
u8 key[0];
@@ -108,6 +136,7 @@ struct crypt_config {
static struct kmem_cache *_crypt_io_pool;
static void clone_init(struct dm_crypt_io *, struct bio *);
+static void kcryptd_queue_crypt(struct dm_crypt_io *io);
/*
* Different IV generation algorithms:
@@ -188,7 +217,7 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
return PTR_ERR(essiv_tfm);
}
if (crypto_cipher_blocksize(essiv_tfm) !=
- crypto_blkcipher_ivsize(cc->tfm)) {
+ crypto_ablkcipher_ivsize(cc->tfm)) {
ti->error = "Block size of ESSIV cipher does "
"not match IV size of block cipher";
crypto_free_cipher(essiv_tfm);
@@ -225,7 +254,7 @@ static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
const char *opts)
{
- unsigned int bs = crypto_blkcipher_blocksize(cc->tfm);
+ unsigned bs = crypto_ablkcipher_blocksize(cc->tfm);
int log = ilog2(bs);
/* we need to calculate how far we must shift the sector count
@@ -289,42 +318,10 @@ static struct crypt_iv_operations crypt_iv_null_ops = {
.generator = crypt_iv_null_gen
};
-static int
-crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
- struct scatterlist *in, unsigned int length,
- int write, sector_t sector)
-{
- u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64))));
- struct blkcipher_desc desc = {
- .tfm = cc->tfm,
- .info = iv,
- .flags = CRYPTO_TFM_REQ_MAY_SLEEP,
- };
- int r;
-
- if (cc->iv_gen_ops) {
- r = cc->iv_gen_ops->generator(cc, iv, sector);
- if (r < 0)
- return r;
-
- if (write)
- r = crypto_blkcipher_encrypt_iv(&desc, out, in, length);
- else
- r = crypto_blkcipher_decrypt_iv(&desc, out, in, length);
- } else {
- if (write)
- r = crypto_blkcipher_encrypt(&desc, out, in, length);
- else
- r = crypto_blkcipher_decrypt(&desc, out, in, length);
- }
-
- return r;
-}
-
static void crypt_convert_init(struct crypt_config *cc,
struct convert_context *ctx,
struct bio *bio_out, struct bio *bio_in,
- sector_t sector, int write)
+ sector_t sector)
{
ctx->bio_in = bio_in;
ctx->bio_out = bio_out;
@@ -333,7 +330,79 @@ static void crypt_convert_init(struct crypt_config *cc,
ctx->idx_in = bio_in ? bio_in->bi_idx : 0;
ctx->idx_out = bio_out ? bio_out->bi_idx : 0;
ctx->sector = sector + cc->iv_offset;
- ctx->write = write;
+ init_completion(&ctx->restart);
+ /*
+ * Crypto operation can be asynchronous,
+ * ctx->pending is increased after request submission.
+ * We need to ensure that we don't call the crypt finish
+ * operation before pending got incremented
+ * (dependent on crypt submission return code).
+ */
+ atomic_set(&ctx->pending, 2);
+}
+
+static int crypt_convert_block(struct crypt_config *cc,
+ struct convert_context *ctx,
+ struct ablkcipher_request *req)
+{
+ struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
+ struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
+ struct dm_crypt_request *dmreq;
+ u8 *iv;
+ int r = 0;
+
+ dmreq = (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
+ iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
+ crypto_ablkcipher_alignmask(cc->tfm) + 1);
+
+ sg_init_table(&dmreq->sg_in, 1);
+ sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
+ bv_in->bv_offset + ctx->offset_in);
+
+ sg_init_table(&dmreq->sg_out, 1);
+ sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT,
+ bv_out->bv_offset + ctx->offset_out);
+
+ ctx->offset_in += 1 << SECTOR_SHIFT;
+ if (ctx->offset_in >= bv_in->bv_len) {
+ ctx->offset_in = 0;
+ ctx->idx_in++;
+ }
+
+ ctx->offset_out += 1 << SECTOR_SHIFT;
+ if (ctx->offset_out >= bv_out->bv_len) {
+ ctx->offset_out = 0;
+ ctx->idx_out++;
+ }
+
+ if (cc->iv_gen_ops) {
+ r = cc->iv_gen_ops->generator(cc, iv, ctx->sector);
+ if (r < 0)
+ return r;
+ }
+
+ ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out,
+ 1 << SECTOR_SHIFT, iv);
+
+ if (bio_data_dir(ctx->bio_in) == WRITE)
+ r = crypto_ablkcipher_encrypt(req);
+ else
+ r = crypto_ablkcipher_decrypt(req);
+
+ return r;
+}
+
+static void kcryptd_async_done(struct crypto_async_request *async_req,
+ int error);
+static void crypt_alloc_req(struct crypt_config *cc,
+ struct convert_context *ctx)
+{
+ if (!cc->req)
+ cc->req = mempool_alloc(cc->req_pool, GFP_NOIO);
+ ablkcipher_request_set_tfm(cc->req, cc->tfm);
+ ablkcipher_request_set_callback(cc->req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+ CRYPTO_TFM_REQ_MAY_SLEEP,
+ kcryptd_async_done, ctx);
}
/*
@@ -346,36 +415,38 @@ static int crypt_convert(struct crypt_config *cc,
while(ctx->idx_in < ctx->bio_in->bi_vcnt &&
ctx->idx_out < ctx->bio_out->bi_vcnt) {
- struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
- struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
- struct scatterlist sg_in, sg_out;
-
- sg_init_table(&sg_in, 1);
- sg_set_page(&sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, bv_in->bv_offset + ctx->offset_in);
-
- sg_init_table(&sg_out, 1);
- sg_set_page(&sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, bv_out->bv_offset + ctx->offset_out);
- ctx->offset_in += sg_in.length;
- if (ctx->offset_in >= bv_in->bv_len) {
- ctx->offset_in = 0;
- ctx->idx_in++;
+ crypt_alloc_req(cc, ctx);
+
+ r = crypt_convert_block(cc, ctx, cc->req);
+
+ switch (r) {
+ case -EBUSY:
+ wait_for_completion(&ctx->restart);
+ INIT_COMPLETION(ctx->restart);
+ /* fall through*/
+ case -EINPROGRESS:
+ atomic_inc(&ctx->pending);
+ cc->req = NULL;
+ r = 0;
+ /* fall through*/
+ case 0:
+ ctx->sector++;
+ continue;
}
- ctx->offset_out += sg_out.length;
- if (ctx->offset_out >= bv_out->bv_len) {
- ctx->offset_out = 0;
- ctx->idx_out++;
- }
-
- r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length,
- ctx->write, ctx->sector);
- if (r < 0)
- break;
-
- ctx->sector++;
+ break;
}
+ /*
+ * If there are pending crypto operation run async
+ * code. Otherwise process return code synchronously.
+ * The step of 2 ensures that async finish doesn't
+ * call crypto finish too early.
+ */
+ if (atomic_sub_return(2, &ctx->pending))
+ return -EINPROGRESS;
+
return r;
}
@@ -455,18 +526,14 @@ static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
* One of the bios was finished. Check for completion of
* the whole request and correctly clean up the buffer.
*/
-static void crypt_dec_pending(struct dm_crypt_io *io, int error)
+static void crypt_dec_pending(struct dm_crypt_io *io)
{
- struct crypt_config *cc = (struct crypt_config *) io->target->private;
-
- if (error < 0)
- io->error = error;
+ struct crypt_config *cc = io->target->private;
if (!atomic_dec_and_test(&io->pending))
return;
bio_endio(io->base_bio, io->error);
-
mempool_free(io, cc->io_pool);
}
@@ -484,30 +551,11 @@ static void crypt_dec_pending(struct dm_crypt_io *io, int error)
* starved by new requests which can block in the first stages due
* to memory allocation.
*/
-static void kcryptd_do_work(struct work_struct *work);
-static void kcryptd_do_crypt(struct work_struct *work);
-
-static void kcryptd_queue_io(struct dm_crypt_io *io)
-{
- struct crypt_config *cc = io->target->private;
-
- INIT_WORK(&io->work, kcryptd_do_work);
- queue_work(cc->io_queue, &io->work);
-}
-
-static void kcryptd_queue_crypt(struct dm_crypt_io *io)
-{
- struct crypt_config *cc = io->target->private;
-
- INIT_WORK(&io->work, kcryptd_do_crypt);
- queue_work(cc->crypt_queue, &io->work);
-}
-
static void crypt_endio(struct bio *clone, int error)
{
struct dm_crypt_io *io = clone->bi_private;
struct crypt_config *cc = io->target->private;
- unsigned read_io = bio_data_dir(clone) == READ;
+ unsigned rw = bio_data_dir(clone);
if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error))
error = -EIO;
@@ -515,21 +563,20 @@ static void crypt_endio(struct bio *clone, int error)
/*
* free the processed pages
*/
- if (!read_io) {
+ if (rw == WRITE)
crypt_free_buffer_pages(cc, clone);
- goto out;
+
+ bio_put(clone);
+
+ if (rw == READ && !error) {
+ kcryptd_queue_crypt(io);
+ return;
}
if (unlikely(error))
- goto out;
-
- bio_put(clone);
- kcryptd_queue_crypt(io);
- return;
+ io->error = error;
-out:
- bio_put(clone);
- crypt_dec_pending(io, error);
+ crypt_dec_pending(io);
}
static void clone_init(struct dm_crypt_io *io, struct bio *clone)
@@ -543,12 +590,11 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone)
clone->bi_destructor = dm_crypt_bio_destructor;
}
-static void process_read(struct dm_crypt_io *io)
+static void kcryptd_io_read(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
struct bio *base_bio = io->base_bio;
struct bio *clone;
- sector_t sector = base_bio->bi_sector - io->target->begin;
atomic_inc(&io->pending);
@@ -559,7 +605,8 @@ static void process_read(struct dm_crypt_io *io)
*/
clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs);
if (unlikely(!clone)) {
- crypt_dec_pending(io, -ENOMEM);
+ io->error = -ENOMEM;
+ crypt_dec_pending(io);
return;
}
@@ -567,25 +614,71 @@ static void process_read(struct dm_crypt_io *io)
clone->bi_idx = 0;
clone->bi_vcnt = bio_segments(base_bio);
clone->bi_size = base_bio->bi_size;
- clone->bi_sector = cc->start + sector;
+ clone->bi_sector = cc->start + io->sector;
memcpy(clone->bi_io_vec, bio_iovec(base_bio),
sizeof(struct bio_vec) * clone->bi_vcnt);
generic_make_request(clone);
}
-static void process_write(struct dm_crypt_io *io)
+static void kcryptd_io_write(struct dm_crypt_io *io)
+{
+ struct bio *clone = io->ctx.bio_out;
+
+ generic_make_request(clone);
+}
+
+static void kcryptd_io(struct work_struct *work)
+{
+ struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
+
+ if (bio_data_dir(io->base_bio) == READ)
+ kcryptd_io_read(io);
+ else
+ kcryptd_io_write(io);
+}
+
+static void kcryptd_queue_io(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
- struct bio *base_bio = io->base_bio;
- struct bio *clone;
- struct convert_context ctx;
- unsigned remaining = base_bio->bi_size;
- sector_t sector = base_bio->bi_sector - io->target->begin;
- atomic_inc(&io->pending);
+ INIT_WORK(&io->work, kcryptd_io);
+ queue_work(cc->io_queue, &io->work);
+}
- crypt_convert_init(cc, &ctx, NULL, base_bio, sector, 1);
+static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io,
+ int error, int async)
+{
+ struct bio *clone = io->ctx.bio_out;
+ struct crypt_config *cc = io->target->private;
+
+ if (unlikely(error < 0)) {
+ crypt_free_buffer_pages(cc, clone);
+ bio_put(clone);
+ io->error = -EIO;
+ return;
+ }
+
+ /* crypt_convert should have filled the clone bio */
+ BUG_ON(io->ctx.idx_out < clone->bi_vcnt);
+
+ clone->bi_sector = cc->start + io->sector;
+ io->sector += bio_sectors(clone);
+
+ if (async)
+ kcryptd_queue_io(io);
+ else {
+ atomic_inc(&io->pending);
+ generic_make_request(clone);
+ }
+}
+
+static void kcryptd_crypt_write_convert_loop(struct dm_crypt_io *io)
+{
+ struct crypt_config *cc = io->target->private;
+ struct bio *clone;
+ unsigned remaining = io->base_bio->bi_size;
+ int r;
/*
* The allocated buffers can be smaller than the whole bio,
@@ -594,70 +687,110 @@ static void process_write(struct dm_crypt_io *io)
while (remaining) {
clone = crypt_alloc_buffer(io, remaining);
if (unlikely(!clone)) {
- crypt_dec_pending(io, -ENOMEM);
+ io->error = -ENOMEM;
return;
}
- ctx.bio_out = clone;
- ctx.idx_out = 0;
+ io->ctx.bio_out = clone;
+ io->ctx.idx_out = 0;
- if (unlikely(crypt_convert(cc, &ctx) < 0)) {
- crypt_free_buffer_pages(cc, clone);
- bio_put(clone);
- crypt_dec_pending(io, -EIO);
- return;
- }
-
- /* crypt_convert should have filled the clone bio */
- BUG_ON(ctx.idx_out < clone->bi_vcnt);
-
- clone->bi_sector = cc->start + sector;
remaining -= clone->bi_size;
- sector += bio_sectors(clone);
- /* Grab another reference to the io struct
- * before we kick off the request */
- if (remaining)
- atomic_inc(&io->pending);
+ r = crypt_convert(cc, &io->ctx);
- generic_make_request(clone);
-
- /* Do not reference clone after this - it
- * may be gone already. */
+ if (r != -EINPROGRESS) {
+ kcryptd_crypt_write_io_submit(io, r, 0);
+ if (unlikely(r < 0))
+ return;
+ } else
+ atomic_inc(&io->pending);
/* out of memory -> run queues */
- if (remaining)
+ if (unlikely(remaining))
congestion_wait(WRITE, HZ/100);
}
}
-static void process_read_endio(struct dm_crypt_io *io)
+static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
- struct convert_context ctx;
- crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio,
- io->base_bio->bi_sector - io->target->begin, 0);
+ /*
+ * Prevent io from disappearing until this function completes.
+ */
+ atomic_inc(&io->pending);
+
+ crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, io->sector);
+ kcryptd_crypt_write_convert_loop(io);
- crypt_dec_pending(io, crypt_convert(cc, &ctx));
+ crypt_dec_pending(io);
}
-static void kcryptd_do_work(struct work_struct *work)
+static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error)
{
- struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
+ if (unlikely(error < 0))
+ io->error = -EIO;
+
+ crypt_dec_pending(io);
+}
+
+static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
+{
+ struct crypt_config *cc = io->target->private;
+ int r = 0;
+
+ atomic_inc(&io->pending);
+
+ crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
+ io->sector);
+
+ r = crypt_convert(cc, &io->ctx);
+
+ if (r != -EINPROGRESS)
+ kcryptd_crypt_read_done(io, r);
+
+ crypt_dec_pending(io);
+}
+
+static void kcryptd_async_done(struct crypto_async_request *async_req,
+ int error)
+{
+ struct convert_context *ctx = async_req->data;
+ struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
+ struct crypt_config *cc = io->target->private;
+
+ if (error == -EINPROGRESS) {
+ complete(&ctx->restart);
+ return;
+ }
+
+ mempool_free(ablkcipher_request_cast(async_req), cc->req_pool);
+
+ if (!atomic_dec_and_test(&ctx->pending))
+ return;
if (bio_data_dir(io->base_bio) == READ)
- process_read(io);
+ kcryptd_crypt_read_done(io, error);
+ else
+ kcryptd_crypt_write_io_submit(io, error, 1);
}
-static void kcryptd_do_crypt(struct work_struct *work)
+static void kcryptd_crypt(struct work_struct *work)
{
struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
if (bio_data_dir(io->base_bio) == READ)
- process_read_endio(io);
+ kcryptd_crypt_read_convert(io);
else
- process_write(io);
+ kcryptd_crypt_write_convert(io);
+}
+
+static void kcryptd_queue_crypt(struct dm_crypt_io *io)
+{
+ struct crypt_config *cc = io->target->private;
+
+ INIT_WORK(&io->work, kcryptd_crypt);
+ queue_work(cc->crypt_queue, &io->work);
}
/*
@@ -733,7 +866,7 @@ static int crypt_wipe_key(struct crypt_config *cc)
static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct crypt_config *cc;
- struct crypto_blkcipher *tfm;
+ struct crypto_ablkcipher *tfm;
char *tmp;
char *cipher;
char *chainmode;
@@ -787,7 +920,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad_cipher;
}
- tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
+ tfm = crypto_alloc_ablkcipher(cc->cipher, 0, 0);
if (IS_ERR(tfm)) {
ti->error = "Error allocating crypto tfm";
goto bad_cipher;
@@ -821,7 +954,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
goto bad_ivmode;
- cc->iv_size = crypto_blkcipher_ivsize(tfm);
+ cc->iv_size = crypto_ablkcipher_ivsize(tfm);
if (cc->iv_size)
/* at least a 64 bit sector number should fit in our buffer */
cc->iv_size = max(cc->iv_size,
@@ -841,6 +974,20 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad_slab_pool;
}
+ cc->dmreq_start = sizeof(struct ablkcipher_request);
+ cc->dmreq_start += crypto_ablkcipher_reqsize(tfm);
+ cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment());
+ cc->dmreq_start += crypto_ablkcipher_alignmask(tfm) &
+ ~(crypto_tfm_ctx_alignment() - 1);
+
+ cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start +
+ sizeof(struct dm_crypt_request) + cc->iv_size);
+ if (!cc->req_pool) {
+ ti->error = "Cannot allocate crypt request mempool";
+ goto bad_req_pool;
+ }
+ cc->req = NULL;
+
cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0);
if (!cc->page_pool) {
ti->error = "Cannot allocate page mempool";
@@ -853,7 +1000,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad_bs;
}
- if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) {
+ if (crypto_ablkcipher_setkey(tfm, cc->key, key_size) < 0) {
ti->error = "Error setting key";
goto bad_device;
}
@@ -914,12 +1061,14 @@ bad_device:
bad_bs:
mempool_destroy(cc->page_pool);
bad_page_pool:
+ mempool_destroy(cc->req_pool);
+bad_req_pool:
mempool_destroy(cc->io_pool);
bad_slab_pool:
if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
cc->iv_gen_ops->dtr(cc);
bad_ivmode:
- crypto_free_blkcipher(tfm);
+ crypto_free_ablkcipher(tfm);
bad_cipher:
/* Must zero key material before freeing */
memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
@@ -934,14 +1083,18 @@ static void crypt_dtr(struct dm_target *ti)
destroy_workqueue(cc->io_queue);
destroy_workqueue(cc->crypt_queue);
+ if (cc->req)
+ mempool_free(cc->req, cc->req_pool);
+
bioset_free(cc->bs);
mempool_destroy(cc->page_pool);
+ mempool_destroy(cc->req_pool);
mempool_destroy(cc->io_pool);
kfree(cc->iv_mode);
if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
cc->iv_gen_ops->dtr(cc);
- crypto_free_blkcipher(cc->tfm);
+ crypto_free_ablkcipher(cc->tfm);
dm_put_device(ti, cc->dev);
/* Must zero key material before freeing */
@@ -958,6 +1111,7 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
io = mempool_alloc(cc->io_pool, GFP_NOIO);
io->target = ti;
io->base_bio = bio;
+ io->sector = bio->bi_sector - ti->begin;
io->error = 0;
atomic_set(&io->pending, 0);
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 8fe81e1807e0..5bbce29f143a 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -449,7 +449,7 @@ static void persistent_destroy(struct exception_store *store)
static int persistent_read_metadata(struct exception_store *store)
{
- int r, new_snapshot;
+ int r, uninitialized_var(new_snapshot);
struct pstore *ps = get_info(store);
/*
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 9627fa0f9470..b262c0042de3 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/dm-ioctl.h>
#include <linux/hdreg.h>
+#include <linux/compat.h>
#include <asm/uaccess.h>
@@ -702,7 +703,7 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
int r;
char *new_name = (char *) param + param->data_start;
- if (new_name < (char *) param->data ||
+ if (new_name < param->data ||
invalid_str(new_name, (void *) param + param_size)) {
DMWARN("Invalid new logical volume name supplied.");
return -EINVAL;
@@ -728,7 +729,7 @@ static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
if (!md)
return -ENXIO;
- if (geostr < (char *) param->data ||
+ if (geostr < param->data ||
invalid_str(geostr, (void *) param + param_size)) {
DMWARN("Invalid geometry supplied.");
goto out;
@@ -1350,10 +1351,10 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param)
{
struct dm_ioctl tmp, *dmi;
- if (copy_from_user(&tmp, user, sizeof(tmp)))
+ if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data)))
return -EFAULT;
- if (tmp.data_size < sizeof(tmp))
+ if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data)))
return -EINVAL;
dmi = vmalloc(tmp.data_size);
@@ -1397,13 +1398,11 @@ static int validate_params(uint cmd, struct dm_ioctl *param)
return 0;
}
-static int ctl_ioctl(struct inode *inode, struct file *file,
- uint command, ulong u)
+static int ctl_ioctl(uint command, struct dm_ioctl __user *user)
{
int r = 0;
unsigned int cmd;
- struct dm_ioctl *param;
- struct dm_ioctl __user *user = (struct dm_ioctl __user *) u;
+ struct dm_ioctl *uninitialized_var(param);
ioctl_fn fn = NULL;
size_t param_size;
@@ -1471,8 +1470,23 @@ static int ctl_ioctl(struct inode *inode, struct file *file,
return r;
}
+static long dm_ctl_ioctl(struct file *file, uint command, ulong u)
+{
+ return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u);
+}
+
+#ifdef CONFIG_COMPAT
+static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u)
+{
+ return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u));
+}
+#else
+#define dm_compat_ctl_ioctl NULL
+#endif
+
static const struct file_operations _ctl_fops = {
- .ioctl = ctl_ioctl,
+ .unlocked_ioctl = dm_ctl_ioctl,
+ .compat_ioctl = dm_compat_ctl_ioctl,
.owner = THIS_MODULE,
};
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 072ee4353eab..2a74b2142f50 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -41,7 +41,7 @@ int dm_unregister_dirty_log_type(struct dirty_log_type *type)
return 0;
}
-static struct dirty_log_type *get_type(const char *type_name)
+static struct dirty_log_type *_get_type(const char *type_name)
{
struct dirty_log_type *type;
@@ -61,6 +61,55 @@ static struct dirty_log_type *get_type(const char *type_name)
return NULL;
}
+/*
+ * get_type
+ * @type_name
+ *
+ * Attempt to retrieve the dirty_log_type by name. If not already
+ * available, attempt to load the appropriate module.
+ *
+ * Log modules are named "dm-log-" followed by the 'type_name'.
+ * Modules may contain multiple types.
+ * This function will first try the module "dm-log-<type_name>",
+ * then truncate 'type_name' on the last '-' and try again.
+ *
+ * For example, if type_name was "clustered-disk", it would search
+ * 'dm-log-clustered-disk' then 'dm-log-clustered'.
+ *
+ * Returns: dirty_log_type* on success, NULL on failure
+ */
+static struct dirty_log_type *get_type(const char *type_name)
+{
+ char *p, *type_name_dup;
+ struct dirty_log_type *type;
+
+ type = _get_type(type_name);
+ if (type)
+ return type;
+
+ type_name_dup = kstrdup(type_name, GFP_KERNEL);
+ if (!type_name_dup) {
+ DMWARN("No memory left to attempt log module load for \"%s\"",
+ type_name);
+ return NULL;
+ }
+
+ while (request_module("dm-log-%s", type_name_dup) ||
+ !(type = _get_type(type_name))) {
+ p = strrchr(type_name_dup, '-');
+ if (!p)
+ break;
+ p[0] = '\0';
+ }
+
+ if (!type)
+ DMWARN("Module for logging type \"%s\" not found.", type_name);
+
+ kfree(type_name_dup);
+
+ return type;
+}
+
static void put_type(struct dirty_log_type *type)
{
spin_lock(&_lock);
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 24b2b1e32fae..e7ee59e655d5 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -106,7 +106,7 @@ typedef int (*action_fn) (struct pgpath *pgpath);
static struct kmem_cache *_mpio_cache;
-struct workqueue_struct *kmultipathd;
+static struct workqueue_struct *kmultipathd;
static void process_queued_ios(struct work_struct *work);
static void trigger_event(struct work_struct *work);
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 31123d4a6b9c..2928ef228101 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -6,6 +6,7 @@
#include "dm.h"
#include "dm-bio-list.h"
+#include "dm-bio-record.h"
#include "dm-io.h"
#include "dm-log.h"
#include "kcopyd.h"
@@ -20,6 +21,7 @@
#include <linux/vmalloc.h>
#include <linux/workqueue.h>
#include <linux/log2.h>
+#include <linux/hardirq.h>
#define DM_MSG_PREFIX "raid1"
#define DM_IO_PAGES 64
@@ -113,9 +115,16 @@ struct region {
/*-----------------------------------------------------------------
* Mirror set structures.
*---------------------------------------------------------------*/
+enum dm_raid1_error {
+ DM_RAID1_WRITE_ERROR,
+ DM_RAID1_SYNC_ERROR,
+ DM_RAID1_READ_ERROR
+};
+
struct mirror {
struct mirror_set *ms;
atomic_t error_count;
+ unsigned long error_type;
struct dm_dev *dev;
sector_t offset;
};
@@ -127,21 +136,25 @@ struct mirror_set {
struct kcopyd_client *kcopyd_client;
uint64_t features;
- spinlock_t lock; /* protects the next two lists */
+ spinlock_t lock; /* protects the lists */
struct bio_list reads;
struct bio_list writes;
+ struct bio_list failures;
struct dm_io_client *io_client;
+ mempool_t *read_record_pool;
/* recovery */
region_t nr_regions;
int in_sync;
int log_failure;
+ atomic_t suspend;
- struct mirror *default_mirror; /* Default mirror */
+ atomic_t default_mirror; /* Default mirror */
struct workqueue_struct *kmirrord_wq;
struct work_struct kmirrord_work;
+ struct work_struct trigger_event;
unsigned int nr_mirrors;
struct mirror mirror[0];
@@ -362,6 +375,16 @@ static void complete_resync_work(struct region *reg, int success)
struct region_hash *rh = reg->rh;
rh->log->type->set_region_sync(rh->log, reg->key, success);
+
+ /*
+ * Dispatch the bios before we call 'wake_up_all'.
+ * This is important because if we are suspending,
+ * we want to know that recovery is complete and
+ * the work queue is flushed. If we wake_up_all
+ * before we dispatch_bios (queue bios and call wake()),
+ * then we risk suspending before the work queue
+ * has been properly flushed.
+ */
dispatch_bios(rh->ms, &reg->delayed_bios);
if (atomic_dec_and_test(&rh->recovery_in_flight))
wake_up_all(&_kmirrord_recovery_stopped);
@@ -626,24 +649,101 @@ static void rh_start_recovery(struct region_hash *rh)
wake(rh->ms);
}
+#define MIN_READ_RECORDS 20
+struct dm_raid1_read_record {
+ struct mirror *m;
+ struct dm_bio_details details;
+};
+
/*
* Every mirror should look like this one.
*/
#define DEFAULT_MIRROR 0
/*
- * This is yucky. We squirrel the mirror_set struct away inside
- * bi_next for write buffers. This is safe since the bh
+ * This is yucky. We squirrel the mirror struct away inside
+ * bi_next for read/write buffers. This is safe since the bh
* doesn't get submitted to the lower levels of block layer.
*/
-static struct mirror_set *bio_get_ms(struct bio *bio)
+static struct mirror *bio_get_m(struct bio *bio)
+{
+ return (struct mirror *) bio->bi_next;
+}
+
+static void bio_set_m(struct bio *bio, struct mirror *m)
+{
+ bio->bi_next = (struct bio *) m;
+}
+
+static struct mirror *get_default_mirror(struct mirror_set *ms)
{
- return (struct mirror_set *) bio->bi_next;
+ return &ms->mirror[atomic_read(&ms->default_mirror)];
}
-static void bio_set_ms(struct bio *bio, struct mirror_set *ms)
+static void set_default_mirror(struct mirror *m)
{
- bio->bi_next = (struct bio *) ms;
+ struct mirror_set *ms = m->ms;
+ struct mirror *m0 = &(ms->mirror[0]);
+
+ atomic_set(&ms->default_mirror, m - m0);
+}
+
+/* fail_mirror
+ * @m: mirror device to fail
+ * @error_type: one of the enum's, DM_RAID1_*_ERROR
+ *
+ * If errors are being handled, record the type of
+ * error encountered for this device. If this type
+ * of error has already been recorded, we can return;
+ * otherwise, we must signal userspace by triggering
+ * an event. Additionally, if the device is the
+ * primary device, we must choose a new primary, but
+ * only if the mirror is in-sync.
+ *
+ * This function must not block.
+ */
+static void fail_mirror(struct mirror *m, enum dm_raid1_error error_type)
+{
+ struct mirror_set *ms = m->ms;
+ struct mirror *new;
+
+ if (!errors_handled(ms))
+ return;
+
+ /*
+ * error_count is used for nothing more than a
+ * simple way to tell if a device has encountered
+ * errors.
+ */
+ atomic_inc(&m->error_count);
+
+ if (test_and_set_bit(error_type, &m->error_type))
+ return;
+
+ if (m != get_default_mirror(ms))
+ goto out;
+
+ if (!ms->in_sync) {
+ /*
+ * Better to issue requests to same failing device
+ * than to risk returning corrupt data.
+ */
+ DMERR("Primary mirror (%s) failed while out-of-sync: "
+ "Reads may fail.", m->dev->name);
+ goto out;
+ }
+
+ for (new = ms->mirror; new < ms->mirror + ms->nr_mirrors; new++)
+ if (!atomic_read(&new->error_count)) {
+ set_default_mirror(new);
+ break;
+ }
+
+ if (unlikely(new == ms->mirror + ms->nr_mirrors))
+ DMWARN("All sides of mirror have failed.");
+
+out:
+ schedule_work(&ms->trigger_event);
}
/*-----------------------------------------------------------------
@@ -656,15 +756,32 @@ static void bio_set_ms(struct bio *bio, struct mirror_set *ms)
static void recovery_complete(int read_err, unsigned int write_err,
void *context)
{
- struct region *reg = (struct region *) context;
+ struct region *reg = (struct region *)context;
+ struct mirror_set *ms = reg->rh->ms;
+ int m, bit = 0;
- if (read_err)
+ if (read_err) {
/* Read error means the failure of default mirror. */
DMERR_LIMIT("Unable to read primary mirror during recovery");
+ fail_mirror(get_default_mirror(ms), DM_RAID1_SYNC_ERROR);
+ }
- if (write_err)
+ if (write_err) {
DMERR_LIMIT("Write error during recovery (error = 0x%x)",
write_err);
+ /*
+ * Bits correspond to devices (excluding default mirror).
+ * The default mirror cannot change during recovery.
+ */
+ for (m = 0; m < ms->nr_mirrors; m++) {
+ if (&ms->mirror[m] == get_default_mirror(ms))
+ continue;
+ if (test_bit(bit, &write_err))
+ fail_mirror(ms->mirror + m,
+ DM_RAID1_SYNC_ERROR);
+ bit++;
+ }
+ }
rh_recovery_end(reg, !(read_err || write_err));
}
@@ -678,7 +795,7 @@ static int recover(struct mirror_set *ms, struct region *reg)
unsigned long flags = 0;
/* fill in the source */
- m = ms->default_mirror;
+ m = get_default_mirror(ms);
from.bdev = m->dev->bdev;
from.sector = m->offset + region_to_sector(reg->rh, reg->key);
if (reg->key == (ms->nr_regions - 1)) {
@@ -694,7 +811,7 @@ static int recover(struct mirror_set *ms, struct region *reg)
/* fill in the destinations */
for (i = 0, dest = to; i < ms->nr_mirrors; i++) {
- if (&ms->mirror[i] == ms->default_mirror)
+ if (&ms->mirror[i] == get_default_mirror(ms))
continue;
m = ms->mirror + i;
@@ -748,17 +865,105 @@ static void do_recovery(struct mirror_set *ms)
*---------------------------------------------------------------*/
static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector)
{
- /* FIXME: add read balancing */
- return ms->default_mirror;
+ struct mirror *m = get_default_mirror(ms);
+
+ do {
+ if (likely(!atomic_read(&m->error_count)))
+ return m;
+
+ if (m-- == ms->mirror)
+ m += ms->nr_mirrors;
+ } while (m != get_default_mirror(ms));
+
+ return NULL;
+}
+
+static int default_ok(struct mirror *m)
+{
+ struct mirror *default_mirror = get_default_mirror(m->ms);
+
+ return !atomic_read(&default_mirror->error_count);
+}
+
+static int mirror_available(struct mirror_set *ms, struct bio *bio)
+{
+ region_t region = bio_to_region(&ms->rh, bio);
+
+ if (ms->rh.log->type->in_sync(ms->rh.log, region, 0))
+ return choose_mirror(ms, bio->bi_sector) ? 1 : 0;
+
+ return 0;
}
/*
* remap a buffer to a particular mirror.
*/
-static void map_bio(struct mirror_set *ms, struct mirror *m, struct bio *bio)
+static sector_t map_sector(struct mirror *m, struct bio *bio)
+{
+ return m->offset + (bio->bi_sector - m->ms->ti->begin);
+}
+
+static void map_bio(struct mirror *m, struct bio *bio)
{
bio->bi_bdev = m->dev->bdev;
- bio->bi_sector = m->offset + (bio->bi_sector - ms->ti->begin);
+ bio->bi_sector = map_sector(m, bio);
+}
+
+static void map_region(struct io_region *io, struct mirror *m,
+ struct bio *bio)
+{
+ io->bdev = m->dev->bdev;
+ io->sector = map_sector(m, bio);
+ io->count = bio->bi_size >> 9;
+}
+
+/*-----------------------------------------------------------------
+ * Reads
+ *---------------------------------------------------------------*/
+static void read_callback(unsigned long error, void *context)
+{
+ struct bio *bio = context;
+ struct mirror *m;
+
+ m = bio_get_m(bio);
+ bio_set_m(bio, NULL);
+
+ if (likely(!error)) {
+ bio_endio(bio, 0);
+ return;
+ }
+
+ fail_mirror(m, DM_RAID1_READ_ERROR);
+
+ if (likely(default_ok(m)) || mirror_available(m->ms, bio)) {
+ DMWARN_LIMIT("Read failure on mirror device %s. "
+ "Trying alternative device.",
+ m->dev->name);
+ queue_bio(m->ms, bio, bio_rw(bio));
+ return;
+ }
+
+ DMERR_LIMIT("Read failure on mirror device %s. Failing I/O.",
+ m->dev->name);
+ bio_endio(bio, -EIO);
+}
+
+/* Asynchronous read. */
+static void read_async_bio(struct mirror *m, struct bio *bio)
+{
+ struct io_region io;
+ struct dm_io_request io_req = {
+ .bi_rw = READ,
+ .mem.type = DM_IO_BVEC,
+ .mem.ptr.bvec = bio->bi_io_vec + bio->bi_idx,
+ .notify.fn = read_callback,
+ .notify.context = bio,
+ .client = m->ms->io_client,
+ };
+
+ map_region(&io, m, bio);
+ bio_set_m(bio, m);
+ (void) dm_io(&io_req, 1, &io, NULL);
}
static void do_reads(struct mirror_set *ms, struct bio_list *reads)
@@ -769,17 +974,20 @@ static void do_reads(struct mirror_set *ms, struct bio_list *reads)
while ((bio = bio_list_pop(reads))) {
region = bio_to_region(&ms->rh, bio);
+ m = get_default_mirror(ms);
/*
* We can only read balance if the region is in sync.
*/
- if (rh_in_sync(&ms->rh, region, 1))
+ if (likely(rh_in_sync(&ms->rh, region, 1)))
m = choose_mirror(ms, bio->bi_sector);
- else
- m = ms->default_mirror;
+ else if (m && atomic_read(&m->error_count))
+ m = NULL;
- map_bio(ms, m, bio);
- generic_make_request(bio);
+ if (likely(m))
+ read_async_bio(m, bio);
+ else
+ bio_endio(bio, -EIO);
}
}
@@ -793,15 +1001,70 @@ static void do_reads(struct mirror_set *ms, struct bio_list *reads)
* RECOVERING: delay the io until recovery completes
* NOSYNC: increment pending, just write to the default mirror
*---------------------------------------------------------------*/
+
+/* __bio_mark_nosync
+ * @ms
+ * @bio
+ * @done
+ * @error
+ *
+ * The bio was written on some mirror(s) but failed on other mirror(s).
+ * We can successfully endio the bio but should avoid the region being
+ * marked clean by setting the state RH_NOSYNC.
+ *
+ * This function is _not_ safe in interrupt context!
+ */
+static void __bio_mark_nosync(struct mirror_set *ms,
+ struct bio *bio, unsigned done, int error)
+{
+ unsigned long flags;
+ struct region_hash *rh = &ms->rh;
+ struct dirty_log *log = ms->rh.log;
+ struct region *reg;
+ region_t region = bio_to_region(rh, bio);
+ int recovering = 0;
+
+ /* We must inform the log that the sync count has changed. */
+ log->type->set_region_sync(log, region, 0);
+ ms->in_sync = 0;
+
+ read_lock(&rh->hash_lock);
+ reg = __rh_find(rh, region);
+ read_unlock(&rh->hash_lock);
+
+ /* region hash entry should exist because write was in-flight */
+ BUG_ON(!reg);
+ BUG_ON(!list_empty(&reg->list));
+
+ spin_lock_irqsave(&rh->region_lock, flags);
+ /*
+ * Possible cases:
+ * 1) RH_DIRTY
+ * 2) RH_NOSYNC: was dirty, other preceeding writes failed
+ * 3) RH_RECOVERING: flushing pending writes
+ * Either case, the region should have not been connected to list.
+ */
+ recovering = (reg->state == RH_RECOVERING);
+ reg->state = RH_NOSYNC;
+ BUG_ON(!list_empty(&reg->list));
+ spin_unlock_irqrestore(&rh->region_lock, flags);
+
+ bio_endio(bio, error);
+ if (recovering)
+ complete_resync_work(reg, 0);
+}
+
static void write_callback(unsigned long error, void *context)
{
- unsigned int i;
- int uptodate = 1;
+ unsigned i, ret = 0;
struct bio *bio = (struct bio *) context;
struct mirror_set *ms;
+ int uptodate = 0;
+ int should_wake = 0;
+ unsigned long flags;
- ms = bio_get_ms(bio);
- bio_set_ms(bio, NULL);
+ ms = bio_get_m(bio)->ms;
+ bio_set_m(bio, NULL);
/*
* NOTE: We don't decrement the pending count here,
@@ -809,26 +1072,42 @@ static void write_callback(unsigned long error, void *context)
* This way we handle both writes to SYNC and NOSYNC
* regions with the same code.
*/
+ if (likely(!error))
+ goto out;
+
+ for (i = 0; i < ms->nr_mirrors; i++)
+ if (test_bit(i, &error))
+ fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR);
+ else
+ uptodate = 1;
- if (error) {
+ if (unlikely(!uptodate)) {
+ DMERR("All replicated volumes dead, failing I/O");
+ /* None of the writes succeeded, fail the I/O. */
+ ret = -EIO;
+ } else if (errors_handled(ms)) {
/*
- * only error the io if all mirrors failed.
- * FIXME: bogus
+ * Need to raise event. Since raising
+ * events can block, we need to do it in
+ * the main thread.
*/
- uptodate = 0;
- for (i = 0; i < ms->nr_mirrors; i++)
- if (!test_bit(i, &error)) {
- uptodate = 1;
- break;
- }
+ spin_lock_irqsave(&ms->lock, flags);
+ if (!ms->failures.head)
+ should_wake = 1;
+ bio_list_add(&ms->failures, bio);
+ spin_unlock_irqrestore(&ms->lock, flags);
+ if (should_wake)
+ wake(ms);
+ return;
}
- bio_endio(bio, 0);
+out:
+ bio_endio(bio, ret);
}
static void do_write(struct mirror_set *ms, struct bio *bio)
{
unsigned int i;
- struct io_region io[KCOPYD_MAX_REGIONS+1];
+ struct io_region io[ms->nr_mirrors], *dest = io;
struct mirror *m;
struct dm_io_request io_req = {
.bi_rw = WRITE,
@@ -839,15 +1118,14 @@ static void do_write(struct mirror_set *ms, struct bio *bio)
.client = ms->io_client,
};
- for (i = 0; i < ms->nr_mirrors; i++) {
- m = ms->mirror + i;
-
- io[i].bdev = m->dev->bdev;
- io[i].sector = m->offset + (bio->bi_sector - ms->ti->begin);
- io[i].count = bio->bi_size >> 9;
- }
+ for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++)
+ map_region(dest++, m, bio);
- bio_set_ms(bio, ms);
+ /*
+ * Use default mirror because we only need it to retrieve the reference
+ * to the mirror set in write_callback().
+ */
+ bio_set_m(bio, get_default_mirror(ms));
(void) dm_io(&io_req, ms->nr_mirrors, io, NULL);
}
@@ -900,43 +1178,125 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes)
/*
* Dispatch io.
*/
- if (unlikely(ms->log_failure))
+ if (unlikely(ms->log_failure)) {
+ spin_lock_irq(&ms->lock);
+ bio_list_merge(&ms->failures, &sync);
+ spin_unlock_irq(&ms->lock);
+ } else
while ((bio = bio_list_pop(&sync)))
- bio_endio(bio, -EIO);
- else while ((bio = bio_list_pop(&sync)))
- do_write(ms, bio);
+ do_write(ms, bio);
while ((bio = bio_list_pop(&recover)))
rh_delay(&ms->rh, bio);
while ((bio = bio_list_pop(&nosync))) {
- map_bio(ms, ms->default_mirror, bio);
+ map_bio(get_default_mirror(ms), bio);
generic_make_request(bio);
}
}
+static void do_failures(struct mirror_set *ms, struct bio_list *failures)
+{
+ struct bio *bio;
+
+ if (!failures->head)
+ return;
+
+ if (!ms->log_failure) {
+ while ((bio = bio_list_pop(failures)))
+ __bio_mark_nosync(ms, bio, bio->bi_size, 0);
+ return;
+ }
+
+ /*
+ * If the log has failed, unattempted writes are being
+ * put on the failures list. We can't issue those writes
+ * until a log has been marked, so we must store them.
+ *
+ * If a 'noflush' suspend is in progress, we can requeue
+ * the I/O's to the core. This give userspace a chance
+ * to reconfigure the mirror, at which point the core
+ * will reissue the writes. If the 'noflush' flag is
+ * not set, we have no choice but to return errors.
+ *
+ * Some writes on the failures list may have been
+ * submitted before the log failure and represent a
+ * failure to write to one of the devices. It is ok
+ * for us to treat them the same and requeue them
+ * as well.
+ */
+ if (dm_noflush_suspending(ms->ti)) {
+ while ((bio = bio_list_pop(failures)))
+ bio_endio(bio, DM_ENDIO_REQUEUE);
+ return;
+ }
+
+ if (atomic_read(&ms->suspend)) {
+ while ((bio = bio_list_pop(failures)))
+ bio_endio(bio, -EIO);
+ return;
+ }
+
+ spin_lock_irq(&ms->lock);
+ bio_list_merge(&ms->failures, failures);
+ spin_unlock_irq(&ms->lock);
+
+ wake(ms);
+}
+
+static void trigger_event(struct work_struct *work)
+{
+ struct mirror_set *ms =
+ container_of(work, struct mirror_set, trigger_event);
+
+ dm_table_event(ms->ti->table);
+}
+
/*-----------------------------------------------------------------
* kmirrord
*---------------------------------------------------------------*/
-static void do_mirror(struct work_struct *work)
+static int _do_mirror(struct work_struct *work)
{
struct mirror_set *ms =container_of(work, struct mirror_set,
kmirrord_work);
- struct bio_list reads, writes;
+ struct bio_list reads, writes, failures;
+ unsigned long flags;
- spin_lock(&ms->lock);
+ spin_lock_irqsave(&ms->lock, flags);
reads = ms->reads;
writes = ms->writes;
+ failures = ms->failures;
bio_list_init(&ms->reads);
bio_list_init(&ms->writes);
- spin_unlock(&ms->lock);
+ bio_list_init(&ms->failures);
+ spin_unlock_irqrestore(&ms->lock, flags);
rh_update_states(&ms->rh);
do_recovery(ms);
do_reads(ms, &reads);
do_writes(ms, &writes);
+ do_failures(ms, &failures);
+
+ return (ms->failures.head) ? 1 : 0;
}
+static void do_mirror(struct work_struct *work)
+{
+ /*
+ * If _do_mirror returns 1, we give it
+ * another shot. This helps for cases like
+ * 'suspend' where we call flush_workqueue
+ * and expect all work to be finished. If
+ * a failure happens during a suspend, we
+ * couldn't issue a 'wake' because it would
+ * not be honored. Therefore, we return '1'
+ * from _do_mirror, and retry here.
+ */
+ while (_do_mirror(work))
+ schedule();
+}
+
+
/*-----------------------------------------------------------------
* Target functions
*---------------------------------------------------------------*/
@@ -965,11 +1325,23 @@ static struct mirror_set *alloc_context(unsigned int nr_mirrors,
ms->nr_mirrors = nr_mirrors;
ms->nr_regions = dm_sector_div_up(ti->len, region_size);
ms->in_sync = 0;
- ms->default_mirror = &ms->mirror[DEFAULT_MIRROR];
+ ms->log_failure = 0;
+ atomic_set(&ms->suspend, 0);
+ atomic_set(&ms->default_mirror, DEFAULT_MIRROR);
+
+ len = sizeof(struct dm_raid1_read_record);
+ ms->read_record_pool = mempool_create_kmalloc_pool(MIN_READ_RECORDS,
+ len);
+ if (!ms->read_record_pool) {
+ ti->error = "Error creating mirror read_record_pool";
+ kfree(ms);
+ return NULL;
+ }
ms->io_client = dm_io_client_create(DM_IO_PAGES);
if (IS_ERR(ms->io_client)) {
ti->error = "Error creating dm_io client";
+ mempool_destroy(ms->read_record_pool);
kfree(ms);
return NULL;
}
@@ -977,6 +1349,7 @@ static struct mirror_set *alloc_context(unsigned int nr_mirrors,
if (rh_init(&ms->rh, ms, dl, region_size, ms->nr_regions)) {
ti->error = "Error creating dirty region hash";
dm_io_client_destroy(ms->io_client);
+ mempool_destroy(ms->read_record_pool);
kfree(ms);
return NULL;
}
@@ -992,6 +1365,7 @@ static void free_context(struct mirror_set *ms, struct dm_target *ti,
dm_io_client_destroy(ms->io_client);
rh_exit(&ms->rh);
+ mempool_destroy(ms->read_record_pool);
kfree(ms);
}
@@ -1019,6 +1393,8 @@ static int get_mirror(struct mirror_set *ms, struct dm_target *ti,
}
ms->mirror[mirror].ms = ms;
+ atomic_set(&(ms->mirror[mirror].error_count), 0);
+ ms->mirror[mirror].error_type = 0;
ms->mirror[mirror].offset = offset;
return 0;
@@ -1171,6 +1547,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto err_free_context;
}
INIT_WORK(&ms->kmirrord_work, do_mirror);
+ INIT_WORK(&ms->trigger_event, trigger_event);
r = parse_features(ms, argc, argv, &args_used);
if (r)
@@ -1220,14 +1597,15 @@ static void mirror_dtr(struct dm_target *ti)
static void queue_bio(struct mirror_set *ms, struct bio *bio, int rw)
{
+ unsigned long flags;
int should_wake = 0;
struct bio_list *bl;
bl = (rw == WRITE) ? &ms->writes : &ms->reads;
- spin_lock(&ms->lock);
+ spin_lock_irqsave(&ms->lock, flags);
should_wake = !(bl->head);
bio_list_add(bl, bio);
- spin_unlock(&ms->lock);
+ spin_unlock_irqrestore(&ms->lock, flags);
if (should_wake)
wake(ms);
@@ -1242,10 +1620,11 @@ static int mirror_map(struct dm_target *ti, struct bio *bio,
int r, rw = bio_rw(bio);
struct mirror *m;
struct mirror_set *ms = ti->private;
-
- map_context->ll = bio_to_region(&ms->rh, bio);
+ struct dm_raid1_read_record *read_record = NULL;
if (rw == WRITE) {
+ /* Save region for mirror_end_io() handler */
+ map_context->ll = bio_to_region(&ms->rh, bio);
queue_bio(ms, bio, rw);
return DM_MAPIO_SUBMITTED;
}
@@ -1255,28 +1634,34 @@ static int mirror_map(struct dm_target *ti, struct bio *bio,
if (r < 0 && r != -EWOULDBLOCK)
return r;
- if (r == -EWOULDBLOCK) /* FIXME: ugly */
- r = DM_MAPIO_SUBMITTED;
-
/*
- * We don't want to fast track a recovery just for a read
- * ahead. So we just let it silently fail.
- * FIXME: get rid of this.
+ * If region is not in-sync queue the bio.
*/
- if (!r && rw == READA)
- return -EIO;
+ if (!r || (r == -EWOULDBLOCK)) {
+ if (rw == READA)
+ return -EWOULDBLOCK;
- if (!r) {
- /* Pass this io over to the daemon */
queue_bio(ms, bio, rw);
return DM_MAPIO_SUBMITTED;
}
+ /*
+ * The region is in-sync and we can perform reads directly.
+ * Store enough information so we can retry if it fails.
+ */
m = choose_mirror(ms, bio->bi_sector);
- if (!m)
+ if (unlikely(!m))
return -EIO;
- map_bio(ms, m, bio);
+ read_record = mempool_alloc(ms->read_record_pool, GFP_NOIO);
+ if (likely(read_record)) {
+ dm_bio_record(&read_record->details, bio);
+ map_context->ptr = read_record;
+ read_record->m = m;
+ }
+
+ map_bio(m, bio);
+
return DM_MAPIO_REMAPPED;
}
@@ -1285,71 +1670,173 @@ static int mirror_end_io(struct dm_target *ti, struct bio *bio,
{
int rw = bio_rw(bio);
struct mirror_set *ms = (struct mirror_set *) ti->private;
- region_t region = map_context->ll;
+ struct mirror *m = NULL;
+ struct dm_bio_details *bd = NULL;
+ struct dm_raid1_read_record *read_record = map_context->ptr;
/*
* We need to dec pending if this was a write.
*/
- if (rw == WRITE)
- rh_dec(&ms->rh, region);
+ if (rw == WRITE) {
+ rh_dec(&ms->rh, map_context->ll);
+ return error;
+ }
- return 0;
+ if (error == -EOPNOTSUPP)
+ goto out;
+
+ if ((error == -EWOULDBLOCK) && bio_rw_ahead(bio))
+ goto out;
+
+ if (unlikely(error)) {
+ if (!read_record) {
+ /*
+ * There wasn't enough memory to record necessary
+ * information for a retry or there was no other
+ * mirror in-sync.
+ */
+ DMERR_LIMIT("Mirror read failed from %s.",
+ m->dev->name);
+ return -EIO;
+ }
+ DMERR("Mirror read failed from %s. Trying alternative device.",
+ m->dev->name);
+
+ m = read_record->m;
+ fail_mirror(m, DM_RAID1_READ_ERROR);
+
+ /*
+ * A failed read is requeued for another attempt using an intact
+ * mirror.
+ */
+ if (default_ok(m) || mirror_available(ms, bio)) {
+ bd = &read_record->details;
+
+ dm_bio_restore(bd, bio);
+ mempool_free(read_record, ms->read_record_pool);
+ map_context->ptr = NULL;
+ queue_bio(ms, bio, rw);
+ return 1;
+ }
+ DMERR("All replicated volumes dead, failing I/O");
+ }
+
+out:
+ if (read_record) {
+ mempool_free(read_record, ms->read_record_pool);
+ map_context->ptr = NULL;
+ }
+
+ return error;
}
-static void mirror_postsuspend(struct dm_target *ti)
+static void mirror_presuspend(struct dm_target *ti)
{
struct mirror_set *ms = (struct mirror_set *) ti->private;
struct dirty_log *log = ms->rh.log;
+ atomic_set(&ms->suspend, 1);
+
+ /*
+ * We must finish up all the work that we've
+ * generated (i.e. recovery work).
+ */
rh_stop_recovery(&ms->rh);
- /* Wait for all I/O we generated to complete */
wait_event(_kmirrord_recovery_stopped,
!atomic_read(&ms->rh.recovery_in_flight));
+ if (log->type->presuspend && log->type->presuspend(log))
+ /* FIXME: need better error handling */
+ DMWARN("log presuspend failed");
+
+ /*
+ * Now that recovery is complete/stopped and the
+ * delayed bios are queued, we need to wait for
+ * the worker thread to complete. This way,
+ * we know that all of our I/O has been pushed.
+ */
+ flush_workqueue(ms->kmirrord_wq);
+}
+
+static void mirror_postsuspend(struct dm_target *ti)
+{
+ struct mirror_set *ms = ti->private;
+ struct dirty_log *log = ms->rh.log;
+
if (log->type->postsuspend && log->type->postsuspend(log))
/* FIXME: need better error handling */
- DMWARN("log suspend failed");
+ DMWARN("log postsuspend failed");
}
static void mirror_resume(struct dm_target *ti)
{
- struct mirror_set *ms = (struct mirror_set *) ti->private;
+ struct mirror_set *ms = ti->private;
struct dirty_log *log = ms->rh.log;
+
+ atomic_set(&ms->suspend, 0);
if (log->type->resume && log->type->resume(log))
/* FIXME: need better error handling */
DMWARN("log resume failed");
rh_start_recovery(&ms->rh);
}
+/*
+ * device_status_char
+ * @m: mirror device/leg we want the status of
+ *
+ * We return one character representing the most severe error
+ * we have encountered.
+ * A => Alive - No failures
+ * D => Dead - A write failure occurred leaving mirror out-of-sync
+ * S => Sync - A sychronization failure occurred, mirror out-of-sync
+ * R => Read - A read failure occurred, mirror data unaffected
+ *
+ * Returns: <char>
+ */
+static char device_status_char(struct mirror *m)
+{
+ if (!atomic_read(&(m->error_count)))
+ return 'A';
+
+ return (test_bit(DM_RAID1_WRITE_ERROR, &(m->error_type))) ? 'D' :
+ (test_bit(DM_RAID1_SYNC_ERROR, &(m->error_type))) ? 'S' :
+ (test_bit(DM_RAID1_READ_ERROR, &(m->error_type))) ? 'R' : 'U';
+}
+
+
static int mirror_status(struct dm_target *ti, status_type_t type,
char *result, unsigned int maxlen)
{
unsigned int m, sz = 0;
struct mirror_set *ms = (struct mirror_set *) ti->private;
+ struct dirty_log *log = ms->rh.log;
+ char buffer[ms->nr_mirrors + 1];
switch (type) {
case STATUSTYPE_INFO:
DMEMIT("%d ", ms->nr_mirrors);
- for (m = 0; m < ms->nr_mirrors; m++)
+ for (m = 0; m < ms->nr_mirrors; m++) {
DMEMIT("%s ", ms->mirror[m].dev->name);
+ buffer[m] = device_status_char(&(ms->mirror[m]));
+ }
+ buffer[m] = '\0';
- DMEMIT("%llu/%llu 0 ",
- (unsigned long long)ms->rh.log->type->
- get_sync_count(ms->rh.log),
- (unsigned long long)ms->nr_regions);
+ DMEMIT("%llu/%llu 1 %s ",
+ (unsigned long long)log->type->get_sync_count(ms->rh.log),
+ (unsigned long long)ms->nr_regions, buffer);
- sz += ms->rh.log->type->status(ms->rh.log, type, result+sz, maxlen-sz);
+ sz += log->type->status(ms->rh.log, type, result+sz, maxlen-sz);
break;
case STATUSTYPE_TABLE:
- sz = ms->rh.log->type->status(ms->rh.log, type, result, maxlen);
+ sz = log->type->status(ms->rh.log, type, result, maxlen);
DMEMIT("%d", ms->nr_mirrors);
for (m = 0; m < ms->nr_mirrors; m++)
DMEMIT(" %s %llu", ms->mirror[m].dev->name,
- (unsigned long long)ms->mirror[m].offset);
+ (unsigned long long)ms->mirror[m].offset);
if (ms->features & DM_RAID1_HANDLE_ERRORS)
DMEMIT(" 1 handle_errors");
@@ -1360,12 +1847,13 @@ static int mirror_status(struct dm_target *ti, status_type_t type,
static struct target_type mirror_target = {
.name = "mirror",
- .version = {1, 0, 3},
+ .version = {1, 0, 20},
.module = THIS_MODULE,
.ctr = mirror_ctr,
.dtr = mirror_dtr,
.map = mirror_map,
.end_io = mirror_end_io,
+ .presuspend = mirror_presuspend,
.postsuspend = mirror_postsuspend,
.resume = mirror_resume,
.status = mirror_status,
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index cee16fadd9ee..ae24eab8cd81 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -213,11 +213,15 @@ static void unregister_snapshot(struct dm_snapshot *s)
/*
* Implementation of the exception hash tables.
+ * The lowest hash_shift bits of the chunk number are ignored, allowing
+ * some consecutive chunks to be grouped together.
*/
-static int init_exception_table(struct exception_table *et, uint32_t size)
+static int init_exception_table(struct exception_table *et, uint32_t size,
+ unsigned hash_shift)
{
unsigned int i;
+ et->hash_shift = hash_shift;
et->hash_mask = size - 1;
et->table = dm_vcalloc(size, sizeof(struct list_head));
if (!et->table)
@@ -248,7 +252,7 @@ static void exit_exception_table(struct exception_table *et, struct kmem_cache *
static uint32_t exception_hash(struct exception_table *et, chunk_t chunk)
{
- return chunk & et->hash_mask;
+ return (chunk >> et->hash_shift) & et->hash_mask;
}
static void insert_exception(struct exception_table *eh,
@@ -275,7 +279,8 @@ static struct dm_snap_exception *lookup_exception(struct exception_table *et,
slot = &et->table[exception_hash(et, chunk)];
list_for_each_entry (e, slot, hash_list)
- if (e->old_chunk == chunk)
+ if (chunk >= e->old_chunk &&
+ chunk <= e->old_chunk + dm_consecutive_chunk_count(e))
return e;
return NULL;
@@ -307,6 +312,49 @@ static void free_pending_exception(struct dm_snap_pending_exception *pe)
mempool_free(pe, pending_pool);
}
+static void insert_completed_exception(struct dm_snapshot *s,
+ struct dm_snap_exception *new_e)
+{
+ struct exception_table *eh = &s->complete;
+ struct list_head *l;
+ struct dm_snap_exception *e = NULL;
+
+ l = &eh->table[exception_hash(eh, new_e->old_chunk)];
+
+ /* Add immediately if this table doesn't support consecutive chunks */
+ if (!eh->hash_shift)
+ goto out;
+
+ /* List is ordered by old_chunk */
+ list_for_each_entry_reverse(e, l, hash_list) {
+ /* Insert after an existing chunk? */
+ if (new_e->old_chunk == (e->old_chunk +
+ dm_consecutive_chunk_count(e) + 1) &&
+ new_e->new_chunk == (dm_chunk_number(e->new_chunk) +
+ dm_consecutive_chunk_count(e) + 1)) {
+ dm_consecutive_chunk_count_inc(e);
+ free_exception(new_e);
+ return;
+ }
+
+ /* Insert before an existing chunk? */
+ if (new_e->old_chunk == (e->old_chunk - 1) &&
+ new_e->new_chunk == (dm_chunk_number(e->new_chunk) - 1)) {
+ dm_consecutive_chunk_count_inc(e);
+ e->old_chunk--;
+ e->new_chunk--;
+ free_exception(new_e);
+ return;
+ }
+
+ if (new_e->old_chunk > e->old_chunk)
+ break;
+ }
+
+out:
+ list_add(&new_e->hash_list, e ? &e->hash_list : l);
+}
+
int dm_add_exception(struct dm_snapshot *s, chunk_t old, chunk_t new)
{
struct dm_snap_exception *e;
@@ -316,8 +364,12 @@ int dm_add_exception(struct dm_snapshot *s, chunk_t old, chunk_t new)
return -ENOMEM;
e->old_chunk = old;
+
+ /* Consecutive_count is implicitly initialised to zero */
e->new_chunk = new;
- insert_exception(&s->complete, e);
+
+ insert_completed_exception(s, e);
+
return 0;
}
@@ -334,16 +386,6 @@ static int calc_max_buckets(void)
}
/*
- * Rounds a number down to a power of 2.
- */
-static uint32_t round_down(uint32_t n)
-{
- while (n & (n - 1))
- n &= (n - 1);
- return n;
-}
-
-/*
* Allocate room for a suitable hash table.
*/
static int init_hash_tables(struct dm_snapshot *s)
@@ -361,9 +403,9 @@ static int init_hash_tables(struct dm_snapshot *s)
hash_size = min(origin_dev_size, cow_dev_size) >> s->chunk_shift;
hash_size = min(hash_size, max_buckets);
- /* Round it down to a power of 2 */
- hash_size = round_down(hash_size);
- if (init_exception_table(&s->complete, hash_size))
+ hash_size = rounddown_pow_of_two(hash_size);
+ if (init_exception_table(&s->complete, hash_size,
+ DM_CHUNK_CONSECUTIVE_BITS))
return -ENOMEM;
/*
@@ -374,7 +416,7 @@ static int init_hash_tables(struct dm_snapshot *s)
if (hash_size < 64)
hash_size = 64;
- if (init_exception_table(&s->pending, hash_size)) {
+ if (init_exception_table(&s->pending, hash_size, 0)) {
exit_exception_table(&s->complete, exception_cache);
return -ENOMEM;
}
@@ -733,7 +775,7 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
* Add a proper exception, and remove the
* in-flight exception from the list.
*/
- insert_exception(&s->complete, e);
+ insert_completed_exception(s, e);
out:
remove_exception(&pe->e);
@@ -867,11 +909,12 @@ __find_pending_exception(struct dm_snapshot *s, struct bio *bio)
}
static void remap_exception(struct dm_snapshot *s, struct dm_snap_exception *e,
- struct bio *bio)
+ struct bio *bio, chunk_t chunk)
{
bio->bi_bdev = s->cow->bdev;
- bio->bi_sector = chunk_to_sector(s, e->new_chunk) +
- (bio->bi_sector & s->chunk_mask);
+ bio->bi_sector = chunk_to_sector(s, dm_chunk_number(e->new_chunk) +
+ (chunk - e->old_chunk)) +
+ (bio->bi_sector & s->chunk_mask);
}
static int snapshot_map(struct dm_target *ti, struct bio *bio,
@@ -902,7 +945,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
/* If the block is already remapped - use that, else remap it */
e = lookup_exception(&s->complete, chunk);
if (e) {
- remap_exception(s, e, bio);
+ remap_exception(s, e, bio, chunk);
goto out_unlock;
}
@@ -919,7 +962,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
goto out_unlock;
}
- remap_exception(s, &pe->e, bio);
+ remap_exception(s, &pe->e, bio, chunk);
bio_list_add(&pe->snapshot_bios, bio);
r = DM_MAPIO_SUBMITTED;
@@ -1207,7 +1250,7 @@ static int origin_status(struct dm_target *ti, status_type_t type, char *result,
static struct target_type origin_target = {
.name = "snapshot-origin",
- .version = {1, 5, 0},
+ .version = {1, 6, 0},
.module = THIS_MODULE,
.ctr = origin_ctr,
.dtr = origin_dtr,
@@ -1218,7 +1261,7 @@ static struct target_type origin_target = {
static struct target_type snapshot_target = {
.name = "snapshot",
- .version = {1, 5, 0},
+ .version = {1, 6, 0},
.module = THIS_MODULE,
.ctr = snapshot_ctr,
.dtr = snapshot_dtr,
diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h
index 650e0f1f51d8..93bce5d49742 100644
--- a/drivers/md/dm-snap.h
+++ b/drivers/md/dm-snap.h
@@ -16,19 +16,22 @@
struct exception_table {
uint32_t hash_mask;
+ unsigned hash_shift;
struct list_head *table;
};
/*
* The snapshot code deals with largish chunks of the disk at a
- * time. Typically 64k - 256k.
+ * time. Typically 32k - 512k.
*/
-/* FIXME: can we get away with limiting these to a uint32_t ? */
typedef sector_t chunk_t;
/*
* An exception is used where an old chunk of data has been
* replaced by a new one.
+ * If chunk_t is 64 bits in size, the top 8 bits of new_chunk hold the number
+ * of chunks that follow contiguously. Remaining bits hold the number of the
+ * chunk within the device.
*/
struct dm_snap_exception {
struct list_head hash_list;
@@ -38,6 +41,49 @@ struct dm_snap_exception {
};
/*
+ * Funtions to manipulate consecutive chunks
+ */
+# if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
+# define DM_CHUNK_CONSECUTIVE_BITS 8
+# define DM_CHUNK_NUMBER_BITS 56
+
+static inline chunk_t dm_chunk_number(chunk_t chunk)
+{
+ return chunk & (chunk_t)((1ULL << DM_CHUNK_NUMBER_BITS) - 1ULL);
+}
+
+static inline unsigned dm_consecutive_chunk_count(struct dm_snap_exception *e)
+{
+ return e->new_chunk >> DM_CHUNK_NUMBER_BITS;
+}
+
+static inline void dm_consecutive_chunk_count_inc(struct dm_snap_exception *e)
+{
+ e->new_chunk += (1ULL << DM_CHUNK_NUMBER_BITS);
+
+ BUG_ON(!dm_consecutive_chunk_count(e));
+}
+
+# else
+# define DM_CHUNK_CONSECUTIVE_BITS 0
+
+static inline chunk_t dm_chunk_number(chunk_t chunk)
+{
+ return chunk;
+}
+
+static inline unsigned dm_consecutive_chunk_count(struct dm_snap_exception *e)
+{
+ return 0;
+}
+
+static inline void dm_consecutive_chunk_count_inc(struct dm_snap_exception *e)
+{
+}
+
+# endif
+
+/*
* Abstraction to handle the meta/layout of exception stores (the
* COW device).
*/
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 969944a8aba2..4de90ab3968b 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -14,10 +14,13 @@
#include <linux/log2.h>
#define DM_MSG_PREFIX "striped"
+#define DM_IO_ERROR_THRESHOLD 15
struct stripe {
struct dm_dev *dev;
sector_t physical_start;
+
+ atomic_t error_count;
};
struct stripe_c {
@@ -30,9 +33,29 @@ struct stripe_c {
uint32_t chunk_shift;
sector_t chunk_mask;
+ /* Needed for handling events */
+ struct dm_target *ti;
+
+ /* Work struct used for triggering events*/
+ struct work_struct kstriped_ws;
+
struct stripe stripe[0];
};
+static struct workqueue_struct *kstriped;
+
+/*
+ * An event is triggered whenever a drive
+ * drops out of a stripe volume.
+ */
+static void trigger_event(struct work_struct *work)
+{
+ struct stripe_c *sc = container_of(work, struct stripe_c, kstriped_ws);
+
+ dm_table_event(sc->ti->table);
+
+}
+
static inline struct stripe_c *alloc_context(unsigned int stripes)
{
size_t len;
@@ -63,6 +86,7 @@ static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
return -ENXIO;
sc->stripe[stripe].physical_start = start;
+
return 0;
}
@@ -135,6 +159,11 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
return -ENOMEM;
}
+ INIT_WORK(&sc->kstriped_ws, trigger_event);
+
+ /* Set pointer to dm target; used in trigger_event */
+ sc->ti = ti;
+
sc->stripes = stripes;
sc->stripe_width = width;
ti->split_io = chunk_size;
@@ -158,9 +187,11 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
kfree(sc);
return r;
}
+ atomic_set(&(sc->stripe[i].error_count), 0);
}
ti->private = sc;
+
return 0;
}
@@ -172,6 +203,7 @@ static void stripe_dtr(struct dm_target *ti)
for (i = 0; i < sc->stripes; i++)
dm_put_device(ti, sc->stripe[i].dev);
+ flush_workqueue(kstriped);
kfree(sc);
}
@@ -190,16 +222,37 @@ static int stripe_map(struct dm_target *ti, struct bio *bio,
return DM_MAPIO_REMAPPED;
}
+/*
+ * Stripe status:
+ *
+ * INFO
+ * #stripes [stripe_name <stripe_name>] [group word count]
+ * [error count 'A|D' <error count 'A|D'>]
+ *
+ * TABLE
+ * #stripes [stripe chunk size]
+ * [stripe_name physical_start <stripe_name physical_start>]
+ *
+ */
+
static int stripe_status(struct dm_target *ti,
status_type_t type, char *result, unsigned int maxlen)
{
struct stripe_c *sc = (struct stripe_c *) ti->private;
+ char buffer[sc->stripes + 1];
unsigned int sz = 0;
unsigned int i;
switch (type) {
case STATUSTYPE_INFO:
- result[0] = '\0';
+ DMEMIT("%d ", sc->stripes);
+ for (i = 0; i < sc->stripes; i++) {
+ DMEMIT("%s ", sc->stripe[i].dev->name);
+ buffer[i] = atomic_read(&(sc->stripe[i].error_count)) ?
+ 'D' : 'A';
+ }
+ buffer[i] = '\0';
+ DMEMIT("1 %s", buffer);
break;
case STATUSTYPE_TABLE:
@@ -213,13 +266,52 @@ static int stripe_status(struct dm_target *ti,
return 0;
}
+static int stripe_end_io(struct dm_target *ti, struct bio *bio,
+ int error, union map_info *map_context)
+{
+ unsigned i;
+ char major_minor[16];
+ struct stripe_c *sc = ti->private;
+
+ if (!error)
+ return 0; /* I/O complete */
+
+ if ((error == -EWOULDBLOCK) && bio_rw_ahead(bio))
+ return error;
+
+ if (error == -EOPNOTSUPP)
+ return error;
+
+ memset(major_minor, 0, sizeof(major_minor));
+ sprintf(major_minor, "%d:%d",
+ bio->bi_bdev->bd_disk->major,
+ bio->bi_bdev->bd_disk->first_minor);
+
+ /*
+ * Test to see which stripe drive triggered the event
+ * and increment error count for all stripes on that device.
+ * If the error count for a given device exceeds the threshold
+ * value we will no longer trigger any further events.
+ */
+ for (i = 0; i < sc->stripes; i++)
+ if (!strcmp(sc->stripe[i].dev->name, major_minor)) {
+ atomic_inc(&(sc->stripe[i].error_count));
+ if (atomic_read(&(sc->stripe[i].error_count)) <
+ DM_IO_ERROR_THRESHOLD)
+ queue_work(kstriped, &sc->kstriped_ws);
+ }
+
+ return error;
+}
+
static struct target_type stripe_target = {
.name = "striped",
- .version= {1, 0, 2},
+ .version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = stripe_ctr,
.dtr = stripe_dtr,
.map = stripe_map,
+ .end_io = stripe_end_io,
.status = stripe_status,
};
@@ -231,6 +323,13 @@ int __init dm_stripe_init(void)
if (r < 0)
DMWARN("target registration failed");
+ kstriped = create_singlethread_workqueue("kstriped");
+ if (!kstriped) {
+ DMERR("failed to create workqueue kstriped");
+ dm_unregister_target(&stripe_target);
+ return -ENOMEM;
+ }
+
return r;
}
@@ -239,5 +338,7 @@ void dm_stripe_exit(void)
if (dm_unregister_target(&stripe_target))
DMWARN("target unregistration failed");
+ destroy_workqueue(kstriped);
+
return;
}
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 47818d8249cb..e75b1437b58b 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -287,9 +287,8 @@ static void free_devices(struct list_head *devices)
{
struct list_head *tmp, *next;
- for (tmp = devices->next; tmp != devices; tmp = next) {
+ list_for_each_safe(tmp, next, devices) {
struct dm_dev *dd = list_entry(tmp, struct dm_dev, list);
- next = tmp->next;
kfree(dd);
}
}
@@ -362,7 +361,7 @@ static int lookup_device(const char *path, dev_t *dev)
if ((r = path_lookup(path, LOOKUP_FOLLOW, &nd)))
return r;
- inode = nd.dentry->d_inode;
+ inode = nd.path.dentry->d_inode;
if (!inode) {
r = -ENOENT;
goto out;
@@ -376,7 +375,7 @@ static int lookup_device(const char *path, dev_t *dev)
*dev = inode->i_rdev;
out:
- path_release(&nd);
+ path_put(&nd.path);
return r;
}
@@ -476,7 +475,7 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
int mode, struct dm_dev **result)
{
int r;
- dev_t dev;
+ dev_t uninitialized_var(dev);
struct dm_dev *dd;
unsigned int major, minor;
@@ -805,7 +804,7 @@ static int setup_indexes(struct dm_table *t)
return -ENOMEM;
/* set up internal nodes, bottom-up */
- for (i = t->depth - 2, total = 0; i >= 0; i--) {
+ for (i = t->depth - 2; i >= 0; i--) {
t->index[i] = indexes;
indexes += (KEYS_PER_NODE * t->counts[i]);
setup_btree_index(i, t);
@@ -993,12 +992,11 @@ int dm_table_resume_targets(struct dm_table *t)
int dm_table_any_congested(struct dm_table *t, int bdi_bits)
{
- struct list_head *d, *devices;
+ struct dm_dev *dd;
+ struct list_head *devices = dm_table_get_devices(t);
int r = 0;
- devices = dm_table_get_devices(t);
- for (d = devices->next; d != devices; d = d->next) {
- struct dm_dev *dd = list_entry(d, struct dm_dev, list);
+ list_for_each_entry(dd, devices, list) {
struct request_queue *q = bdev_get_queue(dd->bdev);
r |= bdi_congested(&q->backing_dev_info, bdi_bits);
}
@@ -1008,10 +1006,10 @@ int dm_table_any_congested(struct dm_table *t, int bdi_bits)
void dm_table_unplug_all(struct dm_table *t)
{
- struct list_head *d, *devices = dm_table_get_devices(t);
+ struct dm_dev *dd;
+ struct list_head *devices = dm_table_get_devices(t);
- for (d = devices->next; d != devices; d = d->next) {
- struct dm_dev *dd = list_entry(d, struct dm_dev, list);
+ list_for_each_entry(dd, devices, list) {
struct request_queue *q = bdev_get_queue(dd->bdev);
blk_unplug(q);
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f2d24eb3208c..6617ce4af095 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -71,9 +71,22 @@ union map_info *dm_get_mapinfo(struct bio *bio)
#define DMF_DELETING 4
#define DMF_NOFLUSH_SUSPENDING 5
+/*
+ * Work processed by per-device workqueue.
+ */
+struct dm_wq_req {
+ enum {
+ DM_WQ_FLUSH_ALL,
+ DM_WQ_FLUSH_DEFERRED,
+ } type;
+ struct work_struct work;
+ struct mapped_device *md;
+ void *context;
+};
+
struct mapped_device {
struct rw_semaphore io_lock;
- struct semaphore suspend_lock;
+ struct mutex suspend_lock;
spinlock_t pushback_lock;
rwlock_t map_lock;
atomic_t holders;
@@ -96,6 +109,11 @@ struct mapped_device {
struct bio_list pushback;
/*
+ * Processing queue (flush/barriers)
+ */
+ struct workqueue_struct *wq;
+
+ /*
* The current mapping.
*/
struct dm_table *map;
@@ -181,7 +199,7 @@ static void local_exit(void)
DMINFO("cleaned up");
}
-int (*_inits[])(void) __initdata = {
+static int (*_inits[])(void) __initdata = {
local_init,
dm_target_init,
dm_linear_init,
@@ -189,7 +207,7 @@ int (*_inits[])(void) __initdata = {
dm_interface_init,
};
-void (*_exits[])(void) = {
+static void (*_exits[])(void) = {
local_exit,
dm_target_exit,
dm_linear_exit,
@@ -982,7 +1000,7 @@ static struct mapped_device *alloc_dev(int minor)
}
if (!try_module_get(THIS_MODULE))
- goto bad0;
+ goto bad_module_get;
/* get a minor number for the dev */
if (minor == DM_ANY_MINOR)
@@ -990,11 +1008,11 @@ static struct mapped_device *alloc_dev(int minor)
else
r = specific_minor(md, minor);
if (r < 0)
- goto bad1;
+ goto bad_minor;
memset(md, 0, sizeof(*md));
init_rwsem(&md->io_lock);
- init_MUTEX(&md->suspend_lock);
+ mutex_init(&md->suspend_lock);
spin_lock_init(&md->pushback_lock);
rwlock_init(&md->map_lock);
atomic_set(&md->holders, 1);
@@ -1006,7 +1024,7 @@ static struct mapped_device *alloc_dev(int minor)
md->queue = blk_alloc_queue(GFP_KERNEL);
if (!md->queue)
- goto bad1_free_minor;
+ goto bad_queue;
md->queue->queuedata = md;
md->queue->backing_dev_info.congested_fn = dm_any_congested;
@@ -1017,11 +1035,11 @@ static struct mapped_device *alloc_dev(int minor)
md->io_pool = mempool_create_slab_pool(MIN_IOS, _io_cache);
if (!md->io_pool)
- goto bad2;
+ goto bad_io_pool;
md->tio_pool = mempool_create_slab_pool(MIN_IOS, _tio_cache);
if (!md->tio_pool)
- goto bad3;
+ goto bad_tio_pool;
md->bs = bioset_create(16, 16);
if (!md->bs)
@@ -1029,7 +1047,7 @@ static struct mapped_device *alloc_dev(int minor)
md->disk = alloc_disk(1);
if (!md->disk)
- goto bad4;
+ goto bad_disk;
atomic_set(&md->pending, 0);
init_waitqueue_head(&md->wait);
@@ -1044,6 +1062,10 @@ static struct mapped_device *alloc_dev(int minor)
add_disk(md->disk);
format_dev_t(md->name, MKDEV(_major, minor));
+ md->wq = create_singlethread_workqueue("kdmflush");
+ if (!md->wq)
+ goto bad_thread;
+
/* Populate the mapping, nobody knows we exist yet */
spin_lock(&_minor_lock);
old_md = idr_replace(&_minor_idr, md, minor);
@@ -1053,19 +1075,21 @@ static struct mapped_device *alloc_dev(int minor)
return md;
- bad4:
+bad_thread:
+ put_disk(md->disk);
+bad_disk:
bioset_free(md->bs);
- bad_no_bioset:
+bad_no_bioset:
mempool_destroy(md->tio_pool);
- bad3:
+bad_tio_pool:
mempool_destroy(md->io_pool);
- bad2:
+bad_io_pool:
blk_cleanup_queue(md->queue);
- bad1_free_minor:
+bad_queue:
free_minor(minor);
- bad1:
+bad_minor:
module_put(THIS_MODULE);
- bad0:
+bad_module_get:
kfree(md);
return NULL;
}
@@ -1080,6 +1104,7 @@ static void free_dev(struct mapped_device *md)
unlock_fs(md);
bdput(md->suspended_bdev);
}
+ destroy_workqueue(md->wq);
mempool_destroy(md->tio_pool);
mempool_destroy(md->io_pool);
bioset_free(md->bs);
@@ -1259,20 +1284,91 @@ void dm_put(struct mapped_device *md)
}
EXPORT_SYMBOL_GPL(dm_put);
+static int dm_wait_for_completion(struct mapped_device *md)
+{
+ int r = 0;
+
+ while (1) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ smp_mb();
+ if (!atomic_read(&md->pending))
+ break;
+
+ if (signal_pending(current)) {
+ r = -EINTR;
+ break;
+ }
+
+ io_schedule();
+ }
+ set_current_state(TASK_RUNNING);
+
+ return r;
+}
+
/*
* Process the deferred bios
*/
-static void __flush_deferred_io(struct mapped_device *md, struct bio *c)
+static void __flush_deferred_io(struct mapped_device *md)
{
- struct bio *n;
+ struct bio *c;
- while (c) {
- n = c->bi_next;
- c->bi_next = NULL;
+ while ((c = bio_list_pop(&md->deferred))) {
if (__split_bio(md, c))
bio_io_error(c);
- c = n;
}
+
+ clear_bit(DMF_BLOCK_IO, &md->flags);
+}
+
+static void __merge_pushback_list(struct mapped_device *md)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&md->pushback_lock, flags);
+ clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
+ bio_list_merge_head(&md->deferred, &md->pushback);
+ bio_list_init(&md->pushback);
+ spin_unlock_irqrestore(&md->pushback_lock, flags);
+}
+
+static void dm_wq_work(struct work_struct *work)
+{
+ struct dm_wq_req *req = container_of(work, struct dm_wq_req, work);
+ struct mapped_device *md = req->md;
+
+ down_write(&md->io_lock);
+ switch (req->type) {
+ case DM_WQ_FLUSH_ALL:
+ __merge_pushback_list(md);
+ /* pass through */
+ case DM_WQ_FLUSH_DEFERRED:
+ __flush_deferred_io(md);
+ break;
+ default:
+ DMERR("dm_wq_work: unrecognised work type %d", req->type);
+ BUG();
+ }
+ up_write(&md->io_lock);
+}
+
+static void dm_wq_queue(struct mapped_device *md, int type, void *context,
+ struct dm_wq_req *req)
+{
+ req->type = type;
+ req->md = md;
+ req->context = context;
+ INIT_WORK(&req->work, dm_wq_work);
+ queue_work(md->wq, &req->work);
+}
+
+static void dm_queue_flush(struct mapped_device *md, int type, void *context)
+{
+ struct dm_wq_req req;
+
+ dm_wq_queue(md, type, context, &req);
+ flush_workqueue(md->wq);
}
/*
@@ -1282,7 +1378,7 @@ int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
int r = -EINVAL;
- down(&md->suspend_lock);
+ mutex_lock(&md->suspend_lock);
/* device must be suspended */
if (!dm_suspended(md))
@@ -1297,7 +1393,7 @@ int dm_swap_table(struct mapped_device *md, struct dm_table *table)
r = __bind(md, table);
out:
- up(&md->suspend_lock);
+ mutex_unlock(&md->suspend_lock);
return r;
}
@@ -1346,17 +1442,17 @@ static void unlock_fs(struct mapped_device *md)
int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
{
struct dm_table *map = NULL;
- unsigned long flags;
DECLARE_WAITQUEUE(wait, current);
- struct bio *def;
- int r = -EINVAL;
+ int r = 0;
int do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG ? 1 : 0;
int noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG ? 1 : 0;
- down(&md->suspend_lock);
+ mutex_lock(&md->suspend_lock);
- if (dm_suspended(md))
+ if (dm_suspended(md)) {
+ r = -EINVAL;
goto out_unlock;
+ }
map = dm_get_table(md);
@@ -1378,16 +1474,16 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
r = -ENOMEM;
goto flush_and_out;
}
- }
- /*
- * Flush I/O to the device.
- * noflush supersedes do_lockfs, because lock_fs() needs to flush I/Os.
- */
- if (do_lockfs && !noflush) {
- r = lock_fs(md);
- if (r)
- goto out;
+ /*
+ * Flush I/O to the device. noflush supersedes do_lockfs,
+ * because lock_fs() needs to flush I/Os.
+ */
+ if (do_lockfs) {
+ r = lock_fs(md);
+ if (r)
+ goto out;
+ }
}
/*
@@ -1404,66 +1500,36 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
dm_table_unplug_all(map);
/*
- * Then we wait for the already mapped ios to
- * complete.
+ * Wait for the already-mapped ios to complete.
*/
- while (1) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (!atomic_read(&md->pending) || signal_pending(current))
- break;
-
- io_schedule();
- }
- set_current_state(TASK_RUNNING);
+ r = dm_wait_for_completion(md);
down_write(&md->io_lock);
remove_wait_queue(&md->wait, &wait);
- if (noflush) {
- spin_lock_irqsave(&md->pushback_lock, flags);
- clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
- bio_list_merge_head(&md->deferred, &md->pushback);
- bio_list_init(&md->pushback);
- spin_unlock_irqrestore(&md->pushback_lock, flags);
- }
+ if (noflush)
+ __merge_pushback_list(md);
+ up_write(&md->io_lock);
/* were we interrupted ? */
- r = -EINTR;
- if (atomic_read(&md->pending)) {
- clear_bit(DMF_BLOCK_IO, &md->flags);
- def = bio_list_get(&md->deferred);
- __flush_deferred_io(md, def);
- up_write(&md->io_lock);
+ if (r < 0) {
+ dm_queue_flush(md, DM_WQ_FLUSH_DEFERRED, NULL);
+
unlock_fs(md);
goto out; /* pushback list is already flushed, so skip flush */
}
- up_write(&md->io_lock);
dm_table_postsuspend_targets(map);
set_bit(DMF_SUSPENDED, &md->flags);
- r = 0;
-
flush_and_out:
- if (r && noflush) {
+ if (r && noflush)
/*
* Because there may be already I/Os in the pushback list,
* flush them before return.
*/
- down_write(&md->io_lock);
-
- spin_lock_irqsave(&md->pushback_lock, flags);
- clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
- bio_list_merge_head(&md->deferred, &md->pushback);
- bio_list_init(&md->pushback);
- spin_unlock_irqrestore(&md->pushback_lock, flags);
-
- def = bio_list_get(&md->deferred);
- __flush_deferred_io(md, def);
- up_write(&md->io_lock);
- }
+ dm_queue_flush(md, DM_WQ_FLUSH_ALL, NULL);
out:
if (r && md->suspended_bdev) {
@@ -1474,17 +1540,16 @@ out:
dm_table_put(map);
out_unlock:
- up(&md->suspend_lock);
+ mutex_unlock(&md->suspend_lock);
return r;
}
int dm_resume(struct mapped_device *md)
{
int r = -EINVAL;
- struct bio *def;
struct dm_table *map = NULL;
- down(&md->suspend_lock);
+ mutex_lock(&md->suspend_lock);
if (!dm_suspended(md))
goto out;
@@ -1496,12 +1561,7 @@ int dm_resume(struct mapped_device *md)
if (r)
goto out;
- down_write(&md->io_lock);
- clear_bit(DMF_BLOCK_IO, &md->flags);
-
- def = bio_list_get(&md->deferred);
- __flush_deferred_io(md, def);
- up_write(&md->io_lock);
+ dm_queue_flush(md, DM_WQ_FLUSH_DEFERRED, NULL);
unlock_fs(md);
@@ -1520,7 +1580,7 @@ int dm_resume(struct mapped_device *md)
out:
dm_table_put(map);
- up(&md->suspend_lock);
+ mutex_unlock(&md->suspend_lock);
return r;
}
diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index cf2ddce34118..d107ddceefcd 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -294,7 +294,7 @@ static int run(mddev_t *mddev)
}
conf->nfaults = 0;
- ITERATE_RDEV(mddev, rdev, tmp)
+ rdev_for_each(rdev, tmp, mddev)
conf->rdev = rdev;
mddev->array_size = mddev->size;
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 3dac1cfb8189..0b8511776b3e 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -122,7 +122,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
cnt = 0;
conf->array_size = 0;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
int j = rdev->raid_disk;
dev_info_t *disk = conf->disks + j;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index c28a120b4161..7da6ec244e15 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -195,7 +195,7 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
* Any code which breaks out of this loop while own
* a reference to the current mddev and must mddev_put it.
*/
-#define ITERATE_MDDEV(mddev,tmp) \
+#define for_each_mddev(mddev,tmp) \
\
for (({ spin_lock(&all_mddevs_lock); \
tmp = all_mddevs.next; \
@@ -275,6 +275,7 @@ static mddev_t * mddev_find(dev_t unit)
spin_lock_init(&new->write_lock);
init_waitqueue_head(&new->sb_wait);
new->reshape_position = MaxSector;
+ new->resync_max = MaxSector;
new->queue = blk_alloc_queue(GFP_KERNEL);
if (!new->queue) {
@@ -310,7 +311,7 @@ static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
mdk_rdev_t * rdev;
struct list_head *tmp;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (rdev->desc_nr == nr)
return rdev;
}
@@ -322,7 +323,7 @@ static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
struct list_head *tmp;
mdk_rdev_t *rdev;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (rdev->bdev->bd_dev == dev)
return rdev;
}
@@ -773,12 +774,16 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
__u64 ev1 = md_event(sb);
rdev->raid_disk = -1;
- rdev->flags = 0;
+ clear_bit(Faulty, &rdev->flags);
+ clear_bit(In_sync, &rdev->flags);
+ clear_bit(WriteMostly, &rdev->flags);
+ clear_bit(BarriersNotsupp, &rdev->flags);
+
if (mddev->raid_disks == 0) {
mddev->major_version = 0;
mddev->minor_version = sb->minor_version;
mddev->patch_version = sb->patch_version;
- mddev->persistent = ! sb->not_persistent;
+ mddev->external = 0;
mddev->chunk_size = sb->chunk_size;
mddev->ctime = sb->ctime;
mddev->utime = sb->utime;
@@ -904,7 +909,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->size = mddev->size;
sb->raid_disks = mddev->raid_disks;
sb->md_minor = mddev->md_minor;
- sb->not_persistent = !mddev->persistent;
+ sb->not_persistent = 0;
sb->utime = mddev->utime;
sb->state = 0;
sb->events_hi = (mddev->events>>32);
@@ -938,7 +943,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->state |= (1<<MD_SB_BITMAP_PRESENT);
sb->disks[0].state = (1<<MD_DISK_REMOVED);
- ITERATE_RDEV(mddev,rdev2,tmp) {
+ rdev_for_each(rdev2, tmp, mddev) {
mdp_disk_t *d;
int desc_nr;
if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
@@ -1153,11 +1158,15 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
__u64 ev1 = le64_to_cpu(sb->events);
rdev->raid_disk = -1;
- rdev->flags = 0;
+ clear_bit(Faulty, &rdev->flags);
+ clear_bit(In_sync, &rdev->flags);
+ clear_bit(WriteMostly, &rdev->flags);
+ clear_bit(BarriersNotsupp, &rdev->flags);
+
if (mddev->raid_disks == 0) {
mddev->major_version = 1;
mddev->patch_version = 0;
- mddev->persistent = 1;
+ mddev->external = 0;
mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
@@ -1286,7 +1295,7 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
}
max_dev = 0;
- ITERATE_RDEV(mddev,rdev2,tmp)
+ rdev_for_each(rdev2, tmp, mddev)
if (rdev2->desc_nr+1 > max_dev)
max_dev = rdev2->desc_nr+1;
@@ -1295,7 +1304,7 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
for (i=0; i<max_dev;i++)
sb->dev_roles[i] = cpu_to_le16(0xfffe);
- ITERATE_RDEV(mddev,rdev2,tmp) {
+ rdev_for_each(rdev2, tmp, mddev) {
i = rdev2->desc_nr;
if (test_bit(Faulty, &rdev2->flags))
sb->dev_roles[i] = cpu_to_le16(0xfffe);
@@ -1333,8 +1342,8 @@ static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
struct list_head *tmp, *tmp2;
mdk_rdev_t *rdev, *rdev2;
- ITERATE_RDEV(mddev1,rdev,tmp)
- ITERATE_RDEV(mddev2, rdev2, tmp2)
+ rdev_for_each(rdev, tmp, mddev1)
+ rdev_for_each(rdev2, tmp2, mddev2)
if (rdev->bdev->bd_contains ==
rdev2->bdev->bd_contains)
return 1;
@@ -1401,7 +1410,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
goto fail;
}
list_add(&rdev->same_set, &mddev->disks);
- bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
+ bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
return 0;
fail:
@@ -1410,10 +1419,11 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
return err;
}
-static void delayed_delete(struct work_struct *ws)
+static void md_delayed_delete(struct work_struct *ws)
{
mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
kobject_del(&rdev->kobj);
+ kobject_put(&rdev->kobj);
}
static void unbind_rdev_from_array(mdk_rdev_t * rdev)
@@ -1432,7 +1442,8 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
/* We need to delay this, otherwise we can deadlock when
* writing to 'remove' to "dev/state"
*/
- INIT_WORK(&rdev->del_work, delayed_delete);
+ INIT_WORK(&rdev->del_work, md_delayed_delete);
+ kobject_get(&rdev->kobj);
schedule_work(&rdev->del_work);
}
@@ -1441,7 +1452,7 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
* otherwise reused by a RAID array (or any other kernel
* subsystem), by bd_claiming the device.
*/
-static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
+static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
{
int err = 0;
struct block_device *bdev;
@@ -1453,13 +1464,15 @@ static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
__bdevname(dev, b));
return PTR_ERR(bdev);
}
- err = bd_claim(bdev, rdev);
+ err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
if (err) {
printk(KERN_ERR "md: could not bd_claim %s.\n",
bdevname(bdev, b));
blkdev_put(bdev);
return err;
}
+ if (!shared)
+ set_bit(AllReserved, &rdev->flags);
rdev->bdev = bdev;
return err;
}
@@ -1503,7 +1516,7 @@ static void export_array(mddev_t *mddev)
struct list_head *tmp;
mdk_rdev_t *rdev;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (!rdev->mddev) {
MD_BUG();
continue;
@@ -1581,17 +1594,17 @@ static void md_print_devices(void)
printk("md: **********************************\n");
printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
printk("md: **********************************\n");
- ITERATE_MDDEV(mddev,tmp) {
+ for_each_mddev(mddev, tmp) {
if (mddev->bitmap)
bitmap_print_sb(mddev->bitmap);
else
printk("%s: ", mdname(mddev));
- ITERATE_RDEV(mddev,rdev,tmp2)
+ rdev_for_each(rdev, tmp2, mddev)
printk("<%s>", bdevname(rdev->bdev,b));
printk("\n");
- ITERATE_RDEV(mddev,rdev,tmp2)
+ rdev_for_each(rdev, tmp2, mddev)
print_rdev(rdev);
}
printk("md: **********************************\n");
@@ -1610,7 +1623,7 @@ static void sync_sbs(mddev_t * mddev, int nospares)
mdk_rdev_t *rdev;
struct list_head *tmp;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (rdev->sb_events == mddev->events ||
(nospares &&
rdev->raid_disk < 0 &&
@@ -1696,18 +1709,20 @@ repeat:
MD_BUG();
mddev->events --;
}
- sync_sbs(mddev, nospares);
/*
* do not write anything to disk if using
* nonpersistent superblocks
*/
if (!mddev->persistent) {
- clear_bit(MD_CHANGE_PENDING, &mddev->flags);
+ if (!mddev->external)
+ clear_bit(MD_CHANGE_PENDING, &mddev->flags);
+
spin_unlock_irq(&mddev->write_lock);
wake_up(&mddev->sb_wait);
return;
}
+ sync_sbs(mddev, nospares);
spin_unlock_irq(&mddev->write_lock);
dprintk(KERN_INFO
@@ -1715,7 +1730,7 @@ repeat:
mdname(mddev),mddev->in_sync);
bitmap_update_sb(mddev->bitmap);
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
char b[BDEVNAME_SIZE];
dprintk(KERN_INFO "md: ");
if (rdev->sb_loaded != 1)
@@ -1785,7 +1800,7 @@ static ssize_t
state_show(mdk_rdev_t *rdev, char *page)
{
char *sep = "";
- int len=0;
+ size_t len = 0;
if (test_bit(Faulty, &rdev->flags)) {
len+= sprintf(page+len, "%sfaulty",sep);
@@ -1887,20 +1902,45 @@ static ssize_t
slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
char *e;
+ int err;
+ char nm[20];
int slot = simple_strtoul(buf, &e, 10);
if (strncmp(buf, "none", 4)==0)
slot = -1;
else if (e==buf || (*e && *e!= '\n'))
return -EINVAL;
- if (rdev->mddev->pers)
- /* Cannot set slot in active array (yet) */
- return -EBUSY;
- if (slot >= rdev->mddev->raid_disks)
- return -ENOSPC;
- rdev->raid_disk = slot;
- /* assume it is working */
- rdev->flags = 0;
- set_bit(In_sync, &rdev->flags);
+ if (rdev->mddev->pers) {
+ /* Setting 'slot' on an active array requires also
+ * updating the 'rd%d' link, and communicating
+ * with the personality with ->hot_*_disk.
+ * For now we only support removing
+ * failed/spare devices. This normally happens automatically,
+ * but not when the metadata is externally managed.
+ */
+ if (slot != -1)
+ return -EBUSY;
+ if (rdev->raid_disk == -1)
+ return -EEXIST;
+ /* personality does all needed checks */
+ if (rdev->mddev->pers->hot_add_disk == NULL)
+ return -EINVAL;
+ err = rdev->mddev->pers->
+ hot_remove_disk(rdev->mddev, rdev->raid_disk);
+ if (err)
+ return err;
+ sprintf(nm, "rd%d", rdev->raid_disk);
+ sysfs_remove_link(&rdev->mddev->kobj, nm);
+ set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
+ md_wakeup_thread(rdev->mddev->thread);
+ } else {
+ if (slot >= rdev->mddev->raid_disks)
+ return -ENOSPC;
+ rdev->raid_disk = slot;
+ /* assume it is working */
+ clear_bit(Faulty, &rdev->flags);
+ clear_bit(WriteMostly, &rdev->flags);
+ set_bit(In_sync, &rdev->flags);
+ }
return len;
}
@@ -1923,6 +1963,10 @@ offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
return -EINVAL;
if (rdev->mddev->pers)
return -EBUSY;
+ if (rdev->size && rdev->mddev->external)
+ /* Must set offset before size, so overlap checks
+ * can be sane */
+ return -EBUSY;
rdev->data_offset = offset;
return len;
}
@@ -1936,16 +1980,69 @@ rdev_size_show(mdk_rdev_t *rdev, char *page)
return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
}
+static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
+{
+ /* check if two start/length pairs overlap */
+ if (s1+l1 <= s2)
+ return 0;
+ if (s2+l2 <= s1)
+ return 0;
+ return 1;
+}
+
static ssize_t
rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
char *e;
unsigned long long size = simple_strtoull(buf, &e, 10);
+ unsigned long long oldsize = rdev->size;
if (e==buf || (*e && *e != '\n'))
return -EINVAL;
if (rdev->mddev->pers)
return -EBUSY;
rdev->size = size;
+ if (size > oldsize && rdev->mddev->external) {
+ /* need to check that all other rdevs with the same ->bdev
+ * do not overlap. We need to unlock the mddev to avoid
+ * a deadlock. We have already changed rdev->size, and if
+ * we have to change it back, we will have the lock again.
+ */
+ mddev_t *mddev;
+ int overlap = 0;
+ struct list_head *tmp, *tmp2;
+
+ mddev_unlock(rdev->mddev);
+ for_each_mddev(mddev, tmp) {
+ mdk_rdev_t *rdev2;
+
+ mddev_lock(mddev);
+ rdev_for_each(rdev2, tmp2, mddev)
+ if (test_bit(AllReserved, &rdev2->flags) ||
+ (rdev->bdev == rdev2->bdev &&
+ rdev != rdev2 &&
+ overlaps(rdev->data_offset, rdev->size,
+ rdev2->data_offset, rdev2->size))) {
+ overlap = 1;
+ break;
+ }
+ mddev_unlock(mddev);
+ if (overlap) {
+ mddev_put(mddev);
+ break;
+ }
+ }
+ mddev_lock(rdev->mddev);
+ if (overlap) {
+ /* Someone else could have slipped in a size
+ * change here, but doing so is just silly.
+ * We put oldsize back because we *know* it is
+ * safe, and trust userspace not to race with
+ * itself
+ */
+ rdev->size = oldsize;
+ return -EBUSY;
+ }
+ }
if (size < rdev->mddev->size || rdev->mddev->size == 0)
rdev->mddev->size = size;
return len;
@@ -1980,12 +2077,18 @@ rdev_attr_store(struct kobject *kobj, struct attribute *attr,
{
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
+ int rv;
if (!entry->store)
return -EIO;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- return entry->store(rdev, page, length);
+ rv = mddev_lock(rdev->mddev);
+ if (!rv) {
+ rv = entry->store(rdev, page, length);
+ mddev_unlock(rdev->mddev);
+ }
+ return rv;
}
static void rdev_free(struct kobject *ko)
@@ -2029,7 +2132,7 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi
if ((err = alloc_disk_sb(rdev)))
goto abort_free;
- err = lock_rdev(rdev, newdev);
+ err = lock_rdev(rdev, newdev, super_format == -2);
if (err)
goto abort_free;
@@ -2099,7 +2202,7 @@ static void analyze_sbs(mddev_t * mddev)
char b[BDEVNAME_SIZE];
freshest = NULL;
- ITERATE_RDEV(mddev,rdev,tmp)
+ rdev_for_each(rdev, tmp, mddev)
switch (super_types[mddev->major_version].
load_super(rdev, freshest, mddev->minor_version)) {
case 1:
@@ -2120,7 +2223,7 @@ static void analyze_sbs(mddev_t * mddev)
validate_super(mddev, freshest);
i = 0;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (rdev != freshest)
if (super_types[mddev->major_version].
validate_super(mddev, rdev)) {
@@ -2215,7 +2318,7 @@ level_show(mddev_t *mddev, char *page)
static ssize_t
level_store(mddev_t *mddev, const char *buf, size_t len)
{
- int rv = len;
+ ssize_t rv = len;
if (mddev->pers)
return -EBUSY;
if (len == 0)
@@ -2425,6 +2528,8 @@ array_state_show(mddev_t *mddev, char *page)
case 0:
if (mddev->in_sync)
st = clean;
+ else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
+ st = write_pending;
else if (mddev->safemode)
st = active_idle;
else
@@ -2455,11 +2560,9 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
break;
case clear:
/* stopping an active array */
- if (mddev->pers) {
- if (atomic_read(&mddev->active) > 1)
- return -EBUSY;
- err = do_md_stop(mddev, 0);
- }
+ if (atomic_read(&mddev->active) > 1)
+ return -EBUSY;
+ err = do_md_stop(mddev, 0);
break;
case inactive:
/* stopping an active array */
@@ -2467,7 +2570,8 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
if (atomic_read(&mddev->active) > 1)
return -EBUSY;
err = do_md_stop(mddev, 2);
- }
+ } else
+ err = 0; /* already inactive */
break;
case suspended:
break; /* not supported yet */
@@ -2495,9 +2599,15 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
restart_array(mddev);
spin_lock_irq(&mddev->write_lock);
if (atomic_read(&mddev->writes_pending) == 0) {
- mddev->in_sync = 1;
- set_bit(MD_CHANGE_CLEAN, &mddev->flags);
- }
+ if (mddev->in_sync == 0) {
+ mddev->in_sync = 1;
+ if (mddev->persistent)
+ set_bit(MD_CHANGE_CLEAN,
+ &mddev->flags);
+ }
+ err = 0;
+ } else
+ err = -EBUSY;
spin_unlock_irq(&mddev->write_lock);
} else {
mddev->ro = 0;
@@ -2508,7 +2618,8 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
case active:
if (mddev->pers) {
restart_array(mddev);
- clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ if (mddev->external)
+ clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
wake_up(&mddev->sb_wait);
err = 0;
} else {
@@ -2574,7 +2685,9 @@ new_dev_store(mddev_t *mddev, const char *buf, size_t len)
if (err < 0)
goto out;
}
- } else
+ } else if (mddev->external)
+ rdev = md_import_device(dev, -2, -1);
+ else
rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev))
@@ -2659,7 +2772,9 @@ __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
/* Metdata version.
- * This is either 'none' for arrays with externally managed metadata,
+ * This is one of
+ * 'none' for arrays with no metadata (good luck...)
+ * 'external' for arrays with externally managed metadata,
* or N.M for internally known formats
*/
static ssize_t
@@ -2668,6 +2783,8 @@ metadata_show(mddev_t *mddev, char *page)
if (mddev->persistent)
return sprintf(page, "%d.%d\n",
mddev->major_version, mddev->minor_version);
+ else if (mddev->external)
+ return sprintf(page, "external:%s\n", mddev->metadata_type);
else
return sprintf(page, "none\n");
}
@@ -2682,6 +2799,21 @@ metadata_store(mddev_t *mddev, const char *buf, size_t len)
if (cmd_match(buf, "none")) {
mddev->persistent = 0;
+ mddev->external = 0;
+ mddev->major_version = 0;
+ mddev->minor_version = 90;
+ return len;
+ }
+ if (strncmp(buf, "external:", 9) == 0) {
+ size_t namelen = len-9;
+ if (namelen >= sizeof(mddev->metadata_type))
+ namelen = sizeof(mddev->metadata_type)-1;
+ strncpy(mddev->metadata_type, buf+9, namelen);
+ mddev->metadata_type[namelen] = 0;
+ if (namelen && mddev->metadata_type[namelen-1] == '\n')
+ mddev->metadata_type[--namelen] = 0;
+ mddev->persistent = 0;
+ mddev->external = 1;
mddev->major_version = 0;
mddev->minor_version = 90;
return len;
@@ -2698,6 +2830,7 @@ metadata_store(mddev_t *mddev, const char *buf, size_t len)
mddev->major_version = major;
mddev->minor_version = minor;
mddev->persistent = 1;
+ mddev->external = 0;
return len;
}
@@ -2865,6 +2998,43 @@ sync_completed_show(mddev_t *mddev, char *page)
static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
static ssize_t
+max_sync_show(mddev_t *mddev, char *page)
+{
+ if (mddev->resync_max == MaxSector)
+ return sprintf(page, "max\n");
+ else
+ return sprintf(page, "%llu\n",
+ (unsigned long long)mddev->resync_max);
+}
+static ssize_t
+max_sync_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ if (strncmp(buf, "max", 3) == 0)
+ mddev->resync_max = MaxSector;
+ else {
+ char *ep;
+ unsigned long long max = simple_strtoull(buf, &ep, 10);
+ if (ep == buf || (*ep != 0 && *ep != '\n'))
+ return -EINVAL;
+ if (max < mddev->resync_max &&
+ test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
+ return -EBUSY;
+
+ /* Must be a multiple of chunk_size */
+ if (mddev->chunk_size) {
+ if (max & (sector_t)((mddev->chunk_size>>9)-1))
+ return -EINVAL;
+ }
+ mddev->resync_max = max;
+ }
+ wake_up(&mddev->recovery_wait);
+ return len;
+}
+
+static struct md_sysfs_entry md_max_sync =
+__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
+
+static ssize_t
suspend_lo_show(mddev_t *mddev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
@@ -2974,6 +3144,7 @@ static struct attribute *md_redundancy_attrs[] = {
&md_sync_max.attr,
&md_sync_speed.attr,
&md_sync_completed.attr,
+ &md_max_sync.attr,
&md_suspend_lo.attr,
&md_suspend_hi.attr,
&md_bitmap.attr,
@@ -3118,8 +3289,11 @@ static int do_md_run(mddev_t * mddev)
/*
* Analyze all RAID superblock(s)
*/
- if (!mddev->raid_disks)
+ if (!mddev->raid_disks) {
+ if (!mddev->persistent)
+ return -EINVAL;
analyze_sbs(mddev);
+ }
chunk_size = mddev->chunk_size;
@@ -3143,7 +3317,7 @@ static int do_md_run(mddev_t * mddev)
}
/* devices must have minimum size of one chunk */
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (test_bit(Faulty, &rdev->flags))
continue;
if (rdev->size < chunk_size / 1024) {
@@ -3170,7 +3344,7 @@ static int do_md_run(mddev_t * mddev)
* the only valid external interface is through the md
* device.
*/
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
if (test_bit(Faulty, &rdev->flags))
continue;
sync_blockdev(rdev->bdev);
@@ -3236,8 +3410,8 @@ static int do_md_run(mddev_t * mddev)
mdk_rdev_t *rdev2;
struct list_head *tmp2;
int warned = 0;
- ITERATE_RDEV(mddev, rdev, tmp) {
- ITERATE_RDEV(mddev, rdev2, tmp2) {
+ rdev_for_each(rdev, tmp, mddev) {
+ rdev_for_each(rdev2, tmp2, mddev) {
if (rdev < rdev2 &&
rdev->bdev->bd_contains ==
rdev2->bdev->bd_contains) {
@@ -3297,7 +3471,7 @@ static int do_md_run(mddev_t * mddev)
mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
mddev->in_sync = 1;
- ITERATE_RDEV(mddev,rdev,tmp)
+ rdev_for_each(rdev, tmp, mddev)
if (rdev->raid_disk >= 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
@@ -3330,7 +3504,7 @@ static int do_md_run(mddev_t * mddev)
if (mddev->degraded && !mddev->sync_thread) {
struct list_head *rtmp;
int spares = 0;
- ITERATE_RDEV(mddev,rdev,rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(In_sync, &rdev->flags) &&
!test_bit(Faulty, &rdev->flags))
@@ -3507,14 +3681,14 @@ static int do_md_stop(mddev_t * mddev, int mode)
}
mddev->bitmap_offset = 0;
- ITERATE_RDEV(mddev,rdev,tmp)
+ rdev_for_each(rdev, tmp, mddev)
if (rdev->raid_disk >= 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
}
- /* make sure all delayed_delete calls have finished */
+ /* make sure all md_delayed_delete calls have finished */
flush_scheduled_work();
export_array(mddev);
@@ -3523,7 +3697,10 @@ static int do_md_stop(mddev_t * mddev, int mode)
mddev->size = 0;
mddev->raid_disks = 0;
mddev->recovery_cp = 0;
+ mddev->resync_max = MaxSector;
mddev->reshape_position = MaxSector;
+ mddev->external = 0;
+ mddev->persistent = 0;
} else if (mddev->pers)
printk(KERN_INFO "md: %s switched to read-only mode.\n",
@@ -3546,7 +3723,7 @@ static void autorun_array(mddev_t *mddev)
printk(KERN_INFO "md: running: ");
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
char b[BDEVNAME_SIZE];
printk("<%s>", bdevname(rdev->bdev,b));
}
@@ -3589,7 +3766,7 @@ static void autorun_devices(int part)
printk(KERN_INFO "md: considering %s ...\n",
bdevname(rdev0->bdev,b));
INIT_LIST_HEAD(&candidates);
- ITERATE_RDEV_PENDING(rdev,tmp)
+ rdev_for_each_list(rdev, tmp, pending_raid_disks)
if (super_90_load(rdev, rdev0, 0) >= 0) {
printk(KERN_INFO "md: adding %s ...\n",
bdevname(rdev->bdev,b));
@@ -3632,7 +3809,8 @@ static void autorun_devices(int part)
mddev_unlock(mddev);
} else {
printk(KERN_INFO "md: created %s\n", mdname(mddev));
- ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
+ mddev->persistent = 1;
+ rdev_for_each_list(rdev, tmp, candidates) {
list_del_init(&rdev->same_set);
if (bind_rdev_to_array(rdev, mddev))
export_rdev(rdev);
@@ -3643,7 +3821,7 @@ static void autorun_devices(int part)
/* on success, candidates will be empty, on error
* it won't...
*/
- ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
+ rdev_for_each_list(rdev, tmp, candidates)
export_rdev(rdev);
mddev_put(mddev);
}
@@ -3673,7 +3851,7 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
struct list_head *tmp;
nr=working=active=failed=spare=0;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
nr++;
if (test_bit(Faulty, &rdev->flags))
failed++;
@@ -3919,8 +4097,6 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
else
rdev->raid_disk = -1;
- rdev->flags = 0;
-
if (rdev->raid_disk < mddev->raid_disks)
if (info->state & (1<<MD_DISK_SYNC))
set_bit(In_sync, &rdev->flags);
@@ -4165,13 +4341,15 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
else
mddev->recovery_cp = 0;
mddev->persistent = ! info->not_persistent;
+ mddev->external = 0;
mddev->layout = info->layout;
mddev->chunk_size = info->chunk_size;
mddev->max_disks = MD_SB_DISKS;
- mddev->flags = 0;
+ if (mddev->persistent)
+ mddev->flags = 0;
set_bit(MD_CHANGE_DEVS, &mddev->flags);
mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
@@ -4213,7 +4391,7 @@ static int update_size(mddev_t *mddev, unsigned long size)
*/
if (mddev->sync_thread)
return -EBUSY;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
sector_t avail;
avail = rdev->size * 2;
@@ -4471,9 +4649,10 @@ static int md_ioctl(struct inode *inode, struct file *file,
*/
/* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
* RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
- if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
- && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
- && cmd != GET_BITMAP_FILE) {
+ if ((!mddev->raid_disks && !mddev->external)
+ && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
+ && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
+ && cmd != GET_BITMAP_FILE) {
err = -ENODEV;
goto abort_unlock;
}
@@ -4757,7 +4936,7 @@ static void status_unused(struct seq_file *seq)
seq_printf(seq, "unused devices: ");
- ITERATE_RDEV_PENDING(rdev,tmp) {
+ rdev_for_each_list(rdev, tmp, pending_raid_disks) {
char b[BDEVNAME_SIZE];
i++;
seq_printf(seq, "%s ",
@@ -4953,7 +5132,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
}
size = 0;
- ITERATE_RDEV(mddev,rdev,tmp2) {
+ rdev_for_each(rdev, tmp2, mddev) {
char b[BDEVNAME_SIZE];
seq_printf(seq, " %s[%d]",
bdevname(rdev->bdev,b), rdev->desc_nr);
@@ -4982,7 +5161,10 @@ static int md_seq_show(struct seq_file *seq, void *v)
mddev->major_version,
mddev->minor_version);
}
- } else
+ } else if (mddev->external)
+ seq_printf(seq, " super external:%s",
+ mddev->metadata_type);
+ else
seq_printf(seq, " super non-persistent");
if (mddev->pers) {
@@ -5015,8 +5197,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
chunk_kb ? "KB" : "B");
if (bitmap->file) {
seq_printf(seq, ", file: ");
- seq_path(seq, bitmap->file->f_path.mnt,
- bitmap->file->f_path.dentry," \t\n");
+ seq_path(seq, &bitmap->file->f_path, " \t\n");
}
seq_printf(seq, "\n");
@@ -5106,7 +5287,7 @@ static int is_mddev_idle(mddev_t *mddev)
long curr_events;
idle = 1;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
curr_events = disk_stat_read(disk, sectors[0]) +
disk_stat_read(disk, sectors[1]) -
@@ -5283,7 +5464,7 @@ void md_do_sync(mddev_t *mddev)
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
goto skip;
}
- ITERATE_MDDEV(mddev2,tmp) {
+ for_each_mddev(mddev2, tmp) {
if (mddev2 == mddev)
continue;
if (mddev2->curr_resync &&
@@ -5333,7 +5514,7 @@ void md_do_sync(mddev_t *mddev)
/* recovery follows the physical size of devices */
max_sectors = mddev->size << 1;
j = MaxSector;
- ITERATE_RDEV(mddev,rdev,rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
@@ -5381,8 +5562,16 @@ void md_do_sync(mddev_t *mddev)
sector_t sectors;
skipped = 0;
+ if (j >= mddev->resync_max) {
+ sysfs_notify(&mddev->kobj, NULL, "sync_completed");
+ wait_event(mddev->recovery_wait,
+ mddev->resync_max > j
+ || kthread_should_stop());
+ }
+ if (kthread_should_stop())
+ goto interrupted;
sectors = mddev->pers->sync_request(mddev, j, &skipped,
- currspeed < speed_min(mddev));
+ currspeed < speed_min(mddev));
if (sectors == 0) {
set_bit(MD_RECOVERY_ERR, &mddev->recovery);
goto out;
@@ -5424,15 +5613,9 @@ void md_do_sync(mddev_t *mddev)
}
- if (kthread_should_stop()) {
- /*
- * got a signal, exit.
- */
- printk(KERN_INFO
- "md: md_do_sync() got signal ... exiting\n");
- set_bit(MD_RECOVERY_INTR, &mddev->recovery);
- goto out;
- }
+ if (kthread_should_stop())
+ goto interrupted;
+
/*
* this loop exits only if either when we are slower than
@@ -5484,7 +5667,7 @@ void md_do_sync(mddev_t *mddev)
} else {
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
mddev->curr_resync = MaxSector;
- ITERATE_RDEV(mddev,rdev,rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
@@ -5496,9 +5679,22 @@ void md_do_sync(mddev_t *mddev)
skip:
mddev->curr_resync = 0;
+ mddev->resync_max = MaxSector;
+ sysfs_notify(&mddev->kobj, NULL, "sync_completed");
wake_up(&resync_wait);
set_bit(MD_RECOVERY_DONE, &mddev->recovery);
md_wakeup_thread(mddev->thread);
+ return;
+
+ interrupted:
+ /*
+ * got a signal, exit.
+ */
+ printk(KERN_INFO
+ "md: md_do_sync() got signal ... exiting\n");
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ goto out;
+
}
EXPORT_SYMBOL_GPL(md_do_sync);
@@ -5509,8 +5705,9 @@ static int remove_and_add_spares(mddev_t *mddev)
struct list_head *rtmp;
int spares = 0;
- ITERATE_RDEV(mddev,rdev,rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk >= 0 &&
+ !mddev->external &&
(test_bit(Faulty, &rdev->flags) ||
! test_bit(In_sync, &rdev->flags)) &&
atomic_read(&rdev->nr_pending)==0) {
@@ -5524,7 +5721,7 @@ static int remove_and_add_spares(mddev_t *mddev)
}
if (mddev->degraded) {
- ITERATE_RDEV(mddev,rdev,rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk < 0
&& !test_bit(Faulty, &rdev->flags)) {
rdev->recovery_offset = 0;
@@ -5589,7 +5786,7 @@ void md_check_recovery(mddev_t *mddev)
}
if ( ! (
- mddev->flags ||
+ (mddev->flags && !mddev->external) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
(mddev->safemode == 1) ||
@@ -5605,7 +5802,8 @@ void md_check_recovery(mddev_t *mddev)
if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
!mddev->in_sync && mddev->recovery_cp == MaxSector) {
mddev->in_sync = 1;
- set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ if (mddev->persistent)
+ set_bit(MD_CHANGE_CLEAN, &mddev->flags);
}
if (mddev->safemode == 1)
mddev->safemode = 0;
@@ -5637,7 +5835,7 @@ void md_check_recovery(mddev_t *mddev)
* information must be scrapped
*/
if (!mddev->degraded)
- ITERATE_RDEV(mddev,rdev,rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
rdev->saved_raid_disk = -1;
mddev->recovery = 0;
@@ -5714,7 +5912,7 @@ static int md_notify_reboot(struct notifier_block *this,
printk(KERN_INFO "md: stopping all md devices.\n");
- ITERATE_MDDEV(mddev,tmp)
+ for_each_mddev(mddev, tmp)
if (mddev_trylock(mddev)) {
do_md_stop (mddev, 1);
mddev_unlock(mddev);
@@ -5848,7 +6046,7 @@ static __exit void md_exit(void)
unregister_reboot_notifier(&md_notifier);
unregister_sysctl_table(raid_table_header);
remove_proc_entry("mdstat", NULL);
- ITERATE_MDDEV(mddev,tmp) {
+ for_each_mddev(mddev, tmp) {
struct gendisk *disk = mddev->gendisk;
if (!disk)
continue;
diff --git a/drivers/md/mktables.c b/drivers/md/mktables.c
index adef299908cf..b61d5767aae7 100644
--- a/drivers/md/mktables.c
+++ b/drivers/md/mktables.c
@@ -1,13 +1,10 @@
-#ident "$Id: mktables.c,v 1.2 2002/12/12 22:41:27 hpa Exp $"
-/* ----------------------------------------------------------------------- *
+/* -*- linux-c -*- ------------------------------------------------------- *
*
- * Copyright 2002 H. Peter Anvin - All Rights Reserved
+ * Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
- * Bostom MA 02111-1307, USA; either version 2 of the License, or
- * (at your option) any later version; incorporated herein by reference.
+ * This file is part of the Linux kernel, and is made available under
+ * the terms of the GNU General Public License version 2 or (at your
+ * option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
@@ -26,100 +23,98 @@
static uint8_t gfmul(uint8_t a, uint8_t b)
{
- uint8_t v = 0;
-
- while ( b ) {
- if ( b & 1 ) v ^= a;
- a = (a << 1) ^ (a & 0x80 ? 0x1d : 0);
- b >>= 1;
- }
- return v;
+ uint8_t v = 0;
+
+ while (b) {
+ if (b & 1)
+ v ^= a;
+ a = (a << 1) ^ (a & 0x80 ? 0x1d : 0);
+ b >>= 1;
+ }
+
+ return v;
}
static uint8_t gfpow(uint8_t a, int b)
{
- uint8_t v = 1;
-
- b %= 255;
- if ( b < 0 )
- b += 255;
-
- while ( b ) {
- if ( b & 1 ) v = gfmul(v,a);
- a = gfmul(a,a);
- b >>= 1;
- }
- return v;
+ uint8_t v = 1;
+
+ b %= 255;
+ if (b < 0)
+ b += 255;
+
+ while (b) {
+ if (b & 1)
+ v = gfmul(v, a);
+ a = gfmul(a, a);
+ b >>= 1;
+ }
+
+ return v;
}
int main(int argc, char *argv[])
{
- int i, j, k;
- uint8_t v;
- uint8_t exptbl[256], invtbl[256];
-
- printf("#include \"raid6.h\"\n");
-
- /* Compute multiplication table */
- printf("\nconst u8 __attribute__((aligned(256)))\n"
- "raid6_gfmul[256][256] =\n"
- "{\n");
- for ( i = 0 ; i < 256 ; i++ ) {
- printf("\t{\n");
- for ( j = 0 ; j < 256 ; j += 8 ) {
- printf("\t\t");
- for ( k = 0 ; k < 8 ; k++ ) {
- printf("0x%02x, ", gfmul(i,j+k));
- }
- printf("\n");
- }
- printf("\t},\n");
- }
- printf("};\n");
-
- /* Compute power-of-2 table (exponent) */
- v = 1;
- printf("\nconst u8 __attribute__((aligned(256)))\n"
- "raid6_gfexp[256] =\n"
- "{\n");
- for ( i = 0 ; i < 256 ; i += 8 ) {
- printf("\t");
- for ( j = 0 ; j < 8 ; j++ ) {
- exptbl[i+j] = v;
- printf("0x%02x, ", v);
- v = gfmul(v,2);
- if ( v == 1 ) v = 0; /* For entry 255, not a real entry */
- }
- printf("\n");
- }
- printf("};\n");
-
- /* Compute inverse table x^-1 == x^254 */
- printf("\nconst u8 __attribute__((aligned(256)))\n"
- "raid6_gfinv[256] =\n"
- "{\n");
- for ( i = 0 ; i < 256 ; i += 8 ) {
- printf("\t");
- for ( j = 0 ; j < 8 ; j++ ) {
- invtbl[i+j] = v = gfpow(i+j,254);
- printf("0x%02x, ", v);
- }
- printf("\n");
- }
- printf("};\n");
-
- /* Compute inv(2^x + 1) (exponent-xor-inverse) table */
- printf("\nconst u8 __attribute__((aligned(256)))\n"
- "raid6_gfexi[256] =\n"
- "{\n");
- for ( i = 0 ; i < 256 ; i += 8 ) {
- printf("\t");
- for ( j = 0 ; j < 8 ; j++ ) {
- printf("0x%02x, ", invtbl[exptbl[i+j]^1]);
- }
- printf("\n");
- }
- printf("};\n\n");
-
- return 0;
+ int i, j, k;
+ uint8_t v;
+ uint8_t exptbl[256], invtbl[256];
+
+ printf("#include \"raid6.h\"\n");
+
+ /* Compute multiplication table */
+ printf("\nconst u8 __attribute__((aligned(256)))\n"
+ "raid6_gfmul[256][256] =\n"
+ "{\n");
+ for (i = 0; i < 256; i++) {
+ printf("\t{\n");
+ for (j = 0; j < 256; j += 8) {
+ printf("\t\t");
+ for (k = 0; k < 8; k++)
+ printf("0x%02x,%c", gfmul(i, j + k),
+ (k == 7) ? '\n' : ' ');
+ }
+ printf("\t},\n");
+ }
+ printf("};\n");
+
+ /* Compute power-of-2 table (exponent) */
+ v = 1;
+ printf("\nconst u8 __attribute__((aligned(256)))\n"
+ "raid6_gfexp[256] =\n" "{\n");
+ for (i = 0; i < 256; i += 8) {
+ printf("\t");
+ for (j = 0; j < 8; j++) {
+ exptbl[i + j] = v;
+ printf("0x%02x,%c", v, (j == 7) ? '\n' : ' ');
+ v = gfmul(v, 2);
+ if (v == 1)
+ v = 0; /* For entry 255, not a real entry */
+ }
+ }
+ printf("};\n");
+
+ /* Compute inverse table x^-1 == x^254 */
+ printf("\nconst u8 __attribute__((aligned(256)))\n"
+ "raid6_gfinv[256] =\n" "{\n");
+ for (i = 0; i < 256; i += 8) {
+ printf("\t");
+ for (j = 0; j < 8; j++) {
+ invtbl[i + j] = v = gfpow(i + j, 254);
+ printf("0x%02x,%c", v, (j == 7) ? '\n' : ' ');
+ }
+ }
+ printf("};\n");
+
+ /* Compute inv(2^x + 1) (exponent-xor-inverse) table */
+ printf("\nconst u8 __attribute__((aligned(256)))\n"
+ "raid6_gfexi[256] =\n" "{\n");
+ for (i = 0; i < 256; i += 8) {
+ printf("\t");
+ for (j = 0; j < 8; j++)
+ printf("0x%02x,%c", invtbl[exptbl[i + j] ^ 1],
+ (j == 7) ? '\n' : ' ');
+ }
+ printf("};\n");
+
+ return 0;
}
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index eb631ebed686..3f299d835a2b 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -436,7 +436,7 @@ static int multipath_run (mddev_t *mddev)
}
conf->working_disks = 0;
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
disk_idx = rdev->raid_disk;
if (disk_idx < 0 ||
disk_idx >= mddev->raid_disks)
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index f8e591708d1f..818b48284096 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -72,11 +72,11 @@ static int create_strip_zones (mddev_t *mddev)
*/
conf->nr_strip_zones = 0;
- ITERATE_RDEV(mddev,rdev1,tmp1) {
+ rdev_for_each(rdev1, tmp1, mddev) {
printk("raid0: looking at %s\n",
bdevname(rdev1->bdev,b));
c = 0;
- ITERATE_RDEV(mddev,rdev2,tmp2) {
+ rdev_for_each(rdev2, tmp2, mddev) {
printk("raid0: comparing %s(%llu)",
bdevname(rdev1->bdev,b),
(unsigned long long)rdev1->size);
@@ -124,7 +124,7 @@ static int create_strip_zones (mddev_t *mddev)
cnt = 0;
smallest = NULL;
zone->dev = conf->devlist;
- ITERATE_RDEV(mddev, rdev1, tmp1) {
+ rdev_for_each(rdev1, tmp1, mddev) {
int j = rdev1->raid_disk;
if (j < 0 || j >= mddev->raid_disks) {
@@ -293,7 +293,7 @@ static int raid0_run (mddev_t *mddev)
/* calculate array device size */
mddev->array_size = 0;
- ITERATE_RDEV(mddev,rdev,tmp)
+ rdev_for_each(rdev, tmp, mddev)
mddev->array_size += rdev->size;
printk("raid0 : md_size is %llu blocks.\n",
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 4a69c416e045..5c7fef091cec 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1684,6 +1684,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
if (!go_faster && conf->nr_waiting)
msleep_interruptible(1000);
+ bitmap_cond_end_sync(mddev->bitmap, sector_nr);
raise_barrier(conf);
conf->next_resync = sector_nr;
@@ -1766,6 +1767,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
return rv;
}
+ if (max_sector > mddev->resync_max)
+ max_sector = mddev->resync_max; /* Don't do IO beyond here */
nr_sectors = 0;
sync_blocks = 0;
do {
@@ -1884,7 +1887,7 @@ static int run(mddev_t *mddev)
if (!conf->r1bio_pool)
goto out_no_mem;
- ITERATE_RDEV(mddev, rdev, tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
|| disk_idx < 0)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 5cdcc9386200..017f58113c33 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1657,6 +1657,9 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
return (max_sector - sector_nr) + sectors_skipped;
}
+ if (max_sector > mddev->resync_max)
+ max_sector = mddev->resync_max; /* Don't do IO beyond here */
+
/* make sure whole request will fit in a chunk - if chunks
* are meaningful
*/
@@ -1670,6 +1673,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
if (!go_faster && conf->nr_waiting)
msleep_interruptible(1000);
+ bitmap_cond_end_sync(mddev->bitmap, sector_nr);
+
/* Again, very different code for resync and recovery.
* Both must result in an r10bio with a list of bios that
* have bi_end_io, bi_sector, bi_bdev set,
@@ -2021,7 +2026,7 @@ static int run(mddev_t *mddev)
goto out_free_conf;
}
- ITERATE_RDEV(mddev, rdev, tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
|| disk_idx < 0)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index e8c8157b02fc..2d6f1a51359c 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3159,7 +3159,8 @@ static void raid5_activate_delayed(raid5_conf_t *conf)
atomic_inc(&conf->preread_active_stripes);
list_add_tail(&sh->lru, &conf->handle_list);
}
- }
+ } else
+ blk_plug_device(conf->mddev->queue);
}
static void activate_bit_delay(raid5_conf_t *conf)
@@ -3549,7 +3550,8 @@ static int make_request(struct request_queue *q, struct bio * bi)
goto retry;
}
finish_wait(&conf->wait_for_overlap, &w);
- handle_stripe(sh, NULL);
+ set_bit(STRIPE_HANDLE, &sh->state);
+ clear_bit(STRIPE_DELAYED, &sh->state);
release_stripe(sh);
} else {
/* cannot get stripe for read-ahead, just give-up */
@@ -3698,6 +3700,25 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
release_stripe(sh);
first_sector += STRIPE_SECTORS;
}
+ /* If this takes us to the resync_max point where we have to pause,
+ * then we need to write out the superblock.
+ */
+ sector_nr += conf->chunk_size>>9;
+ if (sector_nr >= mddev->resync_max) {
+ /* Cannot proceed until we've updated the superblock... */
+ wait_event(conf->wait_for_overlap,
+ atomic_read(&conf->reshape_stripes) == 0);
+ mddev->reshape_position = conf->expand_progress;
+ set_bit(MD_CHANGE_DEVS, &mddev->flags);
+ md_wakeup_thread(mddev->thread);
+ wait_event(mddev->sb_wait,
+ !test_bit(MD_CHANGE_DEVS, &mddev->flags)
+ || kthread_should_stop());
+ spin_lock_irq(&conf->device_lock);
+ conf->expand_lo = mddev->reshape_position;
+ spin_unlock_irq(&conf->device_lock);
+ wake_up(&conf->wait_for_overlap);
+ }
return conf->chunk_size>>9;
}
@@ -3734,6 +3755,12 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
return reshape_request(mddev, sector_nr, skipped);
+ /* No need to check resync_max as we never do more than one
+ * stripe, and as resync_max will always be on a chunk boundary,
+ * if the check in md_do_sync didn't fire, there is no chance
+ * of overstepping resync_max here
+ */
+
/* if there is too many failed drives and we are trying
* to resync, then assert that we are finished, because there is
* nothing we can do.
@@ -3753,6 +3780,9 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */
}
+
+ bitmap_cond_end_sync(mddev->bitmap, sector_nr);
+
pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks);
sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 1);
if (sh == NULL) {
@@ -3864,7 +3894,7 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
* During the scan, completed stripes are saved for us by the interrupt
* handler, so that they will not have to wait for our next wakeup.
*/
-static void raid5d (mddev_t *mddev)
+static void raid5d(mddev_t *mddev)
{
struct stripe_head *sh;
raid5_conf_t *conf = mddev_to_conf(mddev);
@@ -3889,12 +3919,6 @@ static void raid5d (mddev_t *mddev)
activate_bit_delay(conf);
}
- if (list_empty(&conf->handle_list) &&
- atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD &&
- !blk_queue_plugged(mddev->queue) &&
- !list_empty(&conf->delayed_list))
- raid5_activate_delayed(conf);
-
while ((bio = remove_bio_from_retry(conf))) {
int ok;
spin_unlock_irq(&conf->device_lock);
@@ -4108,7 +4132,7 @@ static int run(mddev_t *mddev)
pr_debug("raid5: run(%s) called.\n", mdname(mddev));
- ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev_for_each(rdev, tmp, mddev) {
raid_disk = rdev->raid_disk;
if (raid_disk >= conf->raid_disks
|| raid_disk < 0)
@@ -4521,7 +4545,7 @@ static int raid5_start_reshape(mddev_t *mddev)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
- ITERATE_RDEV(mddev, rdev, rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags))
spares++;
@@ -4543,7 +4567,7 @@ static int raid5_start_reshape(mddev_t *mddev)
/* Add some new drives, as many as will fit.
* We know there are enough to make the newly sized array work.
*/
- ITERATE_RDEV(mddev, rdev, rtmp)
+ rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags)) {
if (raid5_add_disk(mddev, rdev)) {
diff --git a/drivers/md/raid6test/test.c b/drivers/md/raid6test/test.c
index 0d5cd57accd7..559cc41b2585 100644
--- a/drivers/md/raid6test/test.c
+++ b/drivers/md/raid6test/test.c
@@ -1,12 +1,10 @@
/* -*- linux-c -*- ------------------------------------------------------- *
*
- * Copyright 2002 H. Peter Anvin - All Rights Reserved
+ * Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
- * Bostom MA 02111-1307, USA; either version 2 of the License, or
- * (at your option) any later version; incorporated herein by reference.
+ * This file is part of the Linux kernel, and is made available under
+ * the terms of the GNU General Public License version 2 or (at your
+ * option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
@@ -30,67 +28,87 @@ char *dataptrs[NDISKS];
char data[NDISKS][PAGE_SIZE];
char recovi[PAGE_SIZE], recovj[PAGE_SIZE];
-void makedata(void)
+static void makedata(void)
{
int i, j;
- for ( i = 0 ; i < NDISKS ; i++ ) {
- for ( j = 0 ; j < PAGE_SIZE ; j++ ) {
+ for (i = 0; i < NDISKS; i++) {
+ for (j = 0; j < PAGE_SIZE; j++)
data[i][j] = rand();
- }
+
dataptrs[i] = data[i];
}
}
+static char disk_type(int d)
+{
+ switch (d) {
+ case NDISKS-2:
+ return 'P';
+ case NDISKS-1:
+ return 'Q';
+ default:
+ return 'D';
+ }
+}
+
+static int test_disks(int i, int j)
+{
+ int erra, errb;
+
+ memset(recovi, 0xf0, PAGE_SIZE);
+ memset(recovj, 0xba, PAGE_SIZE);
+
+ dataptrs[i] = recovi;
+ dataptrs[j] = recovj;
+
+ raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
+
+ erra = memcmp(data[i], recovi, PAGE_SIZE);
+ errb = memcmp(data[j], recovj, PAGE_SIZE);
+
+ if (i < NDISKS-2 && j == NDISKS-1) {
+ /* We don't implement the DQ failure scenario, since it's
+ equivalent to a RAID-5 failure (XOR, then recompute Q) */
+ erra = errb = 0;
+ } else {
+ printf("algo=%-8s faila=%3d(%c) failb=%3d(%c) %s\n",
+ raid6_call.name,
+ i, disk_type(i),
+ j, disk_type(j),
+ (!erra && !errb) ? "OK" :
+ !erra ? "ERRB" :
+ !errb ? "ERRA" : "ERRAB");
+ }
+
+ dataptrs[i] = data[i];
+ dataptrs[j] = data[j];
+
+ return erra || errb;
+}
+
int main(int argc, char *argv[])
{
- const struct raid6_calls * const * algo;
+ const struct raid6_calls *const *algo;
int i, j;
- int erra, errb;
+ int err = 0;
makedata();
- for ( algo = raid6_algos ; *algo ; algo++ ) {
- if ( !(*algo)->valid || (*algo)->valid() ) {
+ for (algo = raid6_algos; *algo; algo++) {
+ if (!(*algo)->valid || (*algo)->valid()) {
raid6_call = **algo;
/* Nuke syndromes */
memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
/* Generate assumed good syndrome */
- raid6_call.gen_syndrome(NDISKS, PAGE_SIZE, (void **)&dataptrs);
-
- for ( i = 0 ; i < NDISKS-1 ; i++ ) {
- for ( j = i+1 ; j < NDISKS ; j++ ) {
- memset(recovi, 0xf0, PAGE_SIZE);
- memset(recovj, 0xba, PAGE_SIZE);
-
- dataptrs[i] = recovi;
- dataptrs[j] = recovj;
-
- raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
-
- erra = memcmp(data[i], recovi, PAGE_SIZE);
- errb = memcmp(data[j], recovj, PAGE_SIZE);
-
- if ( i < NDISKS-2 && j == NDISKS-1 ) {
- /* We don't implement the DQ failure scenario, since it's
- equivalent to a RAID-5 failure (XOR, then recompute Q) */
- } else {
- printf("algo=%-8s faila=%3d(%c) failb=%3d(%c) %s\n",
- raid6_call.name,
- i, (i==NDISKS-2)?'P':'D',
- j, (j==NDISKS-1)?'Q':(j==NDISKS-2)?'P':'D',
- (!erra && !errb) ? "OK" :
- !erra ? "ERRB" :
- !errb ? "ERRA" :
- "ERRAB");
- }
-
- dataptrs[i] = data[i];
- dataptrs[j] = data[j];
- }
- }
+ raid6_call.gen_syndrome(NDISKS, PAGE_SIZE,
+ (void **)&dataptrs);
+
+ for (i = 0; i < NDISKS-1; i++)
+ for (j = i+1; j < NDISKS; j++)
+ err += test_disks(i, j);
}
printf("\n");
}
@@ -99,5 +117,8 @@ int main(int argc, char *argv[])
/* Pick the best algorithm test */
raid6_select_algo();
- return 0;
+ if (err)
+ printf("\n*** ERRORS FOUND ***\n");
+
+ return err;
}
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-27 20:25:32 +0300