Commit a70f35af authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-3.5/drivers' of git://git.kernel.dk/linux-block 

Pull block driver updates from Jens Axboe:
 "Here are the driver related changes for 3.5.  It contains:

   - The floppy changes from Jiri.  Jiri is now also marked as the
     maintainer of floppy.c, I shall be publically branding his forehead
     with red hot iron at the next opportune moment.

   - A batch of drbd updates and fixes from the linbit crew, as well as
     fixes from others.

   - Two small fixes for xen-blkfront courtesy of Jan."

* 'for-3.5/drivers' of git://git.kernel.dk/linux-block: (70 commits)
  floppy: take over maintainership
  floppy: remove floppy-specific O_EXCL handling
  floppy: convert to delayed work and single-thread wq
  xen-blkfront: module exit handling adjustments
  xen-blkfront: properly name all devices
  drbd: grammar fix in log message
  drbd: check MODULE for THIS_MODULE
  drbd: Restore the request restart logic
  drbd: introduce a bio_set to allocate housekeeping bios from
  drbd: remove unused define
  drbd: bm_page_async_io: properly initialize page->private
  drbd: use the newly introduced page pool for bitmap IO
  drbd: add page pool to be used for meta data IO
  drbd: allow bitmap to change during writeout from resync_finished
  drbd: fix race between drbdadm invalidate/verify and finishing resync
  drbd: fix resend/resubmit of frozen IO
  drbd: Ensure that data_size is not 0 before using data_size-1 as index
  drbd: Delay/reject other state changes while establishing a connection
  drbd: move put_ldev from __req_mod() to the endio callback
  drbd: fix WRITE_ACKED_BY_PEER_AND_SIS to not set RQ_NET_DONE
  ...
parents 0d167518 4fd1ffaa

MAINTAINERS

+6 −0
Original line number Diff line number Diff line
@@ -2818,6 +2818,12 @@ F: Documentation/firmware_class/ 
F:	drivers/base/firmware*.c

F:	include/linux/firmware.h



FLOPPY DRIVER

M:	Jiri Kosina <jkosina@suse.cz>

T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jikos/floppy.git

S:	Odd fixes

F:	drivers/block/floppy.c



FPU EMULATOR

M:	Bill Metzenthen <billm@melbpc.org.au>

W:	http://floatingpoint.sourceforge.net/emulator/index.html

drivers/block/drbd/drbd_actlog.c

+78 −26
Original line number Diff line number Diff line
@@ -65,39 +65,80 @@ struct drbd_atodb_wait { 


int w_al_write_transaction(struct drbd_conf *, struct drbd_work *, int);



void *drbd_md_get_buffer(struct drbd_conf *mdev)

{

	int r;



	wait_event(mdev->misc_wait,

		   (r = atomic_cmpxchg(&mdev->md_io_in_use, 0, 1)) == 0 ||

		   mdev->state.disk <= D_FAILED);



	return r ? NULL : page_address(mdev->md_io_page);

}



void drbd_md_put_buffer(struct drbd_conf *mdev)

{

	if (atomic_dec_and_test(&mdev->md_io_in_use))

		wake_up(&mdev->misc_wait);

}



static bool md_io_allowed(struct drbd_conf *mdev)

{

	enum drbd_disk_state ds = mdev->state.disk;

	return ds >= D_NEGOTIATING || ds == D_ATTACHING;

}



void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,

				     unsigned int *done)

{

	long dt = bdev->dc.disk_timeout * HZ / 10;

	if (dt == 0)

		dt = MAX_SCHEDULE_TIMEOUT;



	dt = wait_event_timeout(mdev->misc_wait, *done || !md_io_allowed(mdev), dt);

	if (dt == 0)

		dev_err(DEV, "meta-data IO operation timed out\n");

}



static int _drbd_md_sync_page_io(struct drbd_conf *mdev,

				 struct drbd_backing_dev *bdev,

				 struct page *page, sector_t sector,

				 int rw, int size)

{

	struct bio *bio;

	struct drbd_md_io md_io;

	int ok;



	md_io.mdev = mdev;

	init_completion(&md_io.event);

	md_io.error = 0;

	mdev->md_io.done = 0;

	mdev->md_io.error = -ENODEV;



	if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))

		rw |= REQ_FUA | REQ_FLUSH;

	rw |= REQ_SYNC;



	bio = bio_alloc(GFP_NOIO, 1);

	bio = bio_alloc_drbd(GFP_NOIO);

	bio->bi_bdev = bdev->md_bdev;

	bio->bi_sector = sector;

	ok = (bio_add_page(bio, page, size, 0) == size);

	if (!ok)

		goto out;

	bio->bi_private = &md_io;

	bio->bi_private = &mdev->md_io;

	bio->bi_end_io = drbd_md_io_complete;

	bio->bi_rw = rw;



	if (!get_ldev_if_state(mdev, D_ATTACHING)) {  /* Corresponding put_ldev in drbd_md_io_complete() */

		dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in _drbd_md_sync_page_io()\n");

		ok = 0;

		goto out;

	}



	bio_get(bio); /* one bio_put() is in the completion handler */

	atomic_inc(&mdev->md_io_in_use); /* drbd_md_put_buffer() is in the completion handler */

	if (drbd_insert_fault(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))

		bio_endio(bio, -EIO);

	else

		submit_bio(rw, bio);

	wait_for_completion(&md_io.event);

	ok = bio_flagged(bio, BIO_UPTODATE) && md_io.error == 0;

	wait_until_done_or_disk_failure(mdev, bdev, &mdev->md_io.done);

	ok = bio_flagged(bio, BIO_UPTODATE) && mdev->md_io.error == 0;



 out:

	bio_put(bio);
@@ -111,7 +152,7 @@ int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, 
	int offset = 0;

	struct page *iop = mdev->md_io_page;



	D_ASSERT(mutex_is_locked(&mdev->md_io_mutex));

	D_ASSERT(atomic_read(&mdev->md_io_in_use) == 1);



	BUG_ON(!bdev->md_bdev);
@@ -328,8 +369,13 @@ w_al_write_transaction(struct drbd_conf *mdev, struct drbd_work *w, int unused) 
		return 1;

	}



	mutex_lock(&mdev->md_io_mutex); /* protects md_io_buffer, al_tr_cycle, ... */

	buffer = (struct al_transaction *)page_address(mdev->md_io_page);

	buffer = drbd_md_get_buffer(mdev); /* protects md_io_buffer, al_tr_cycle, ... */

	if (!buffer) {

		dev_err(DEV, "disk failed while waiting for md_io buffer\n");

		complete(&((struct update_al_work *)w)->event);

		put_ldev(mdev);

		return 1;

	}



	buffer->magic = __constant_cpu_to_be32(DRBD_MAGIC);

	buffer->tr_number = cpu_to_be32(mdev->al_tr_number);
@@ -374,7 +420,7 @@ w_al_write_transaction(struct drbd_conf *mdev, struct drbd_work *w, int unused) 
	D_ASSERT(mdev->al_tr_pos < MD_AL_MAX_SIZE);

	mdev->al_tr_number++;



	mutex_unlock(&mdev->md_io_mutex);

	drbd_md_put_buffer(mdev);



	complete(&((struct update_al_work *)w)->event);

	put_ldev(mdev);
@@ -443,8 +489,9 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
	/* lock out all other meta data io for now,

	 * and make sure the page is mapped.

	 */

	mutex_lock(&mdev->md_io_mutex);

	buffer = page_address(mdev->md_io_page);

	buffer = drbd_md_get_buffer(mdev);

	if (!buffer)

		return 0;



	/* Find the valid transaction in the log */

	for (i = 0; i <= mx; i++) {
@@ -452,7 +499,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
		if (rv == 0)

			continue;

		if (rv == -1) {

			mutex_unlock(&mdev->md_io_mutex);

			drbd_md_put_buffer(mdev);

			return 0;

		}

		cnr = be32_to_cpu(buffer->tr_number);
@@ -478,7 +525,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 


	if (!found_valid) {

		dev_warn(DEV, "No usable activity log found.\n");

		mutex_unlock(&mdev->md_io_mutex);

		drbd_md_put_buffer(mdev);

		return 1;

	}
@@ -493,7 +540,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
		rv = drbd_al_read_tr(mdev, bdev, buffer, i);

		ERR_IF(rv == 0) goto cancel;

		if (rv == -1) {

			mutex_unlock(&mdev->md_io_mutex);

			drbd_md_put_buffer(mdev);

			return 0;

		}
@@ -534,7 +581,7 @@ cancel: 
		mdev->al_tr_pos = 0;



	/* ok, we are done with it */

	mutex_unlock(&mdev->md_io_mutex);

	drbd_md_put_buffer(mdev);



	dev_info(DEV, "Found %d transactions (%d active extents) in activity log.\n",

	     transactions, active_extents);
@@ -671,16 +718,20 @@ static void drbd_try_clear_on_disk_bm(struct drbd_conf *mdev, sector_t sector, 
			else

				ext->rs_failed += count;

			if (ext->rs_left < ext->rs_failed) {

				dev_err(DEV, "BAD! sector=%llus enr=%u rs_left=%d "

				    "rs_failed=%d count=%d\n",

				dev_warn(DEV, "BAD! sector=%llus enr=%u rs_left=%d "

				    "rs_failed=%d count=%d cstate=%s\n",

				     (unsigned long long)sector,

				     ext->lce.lc_number, ext->rs_left,

				     ext->rs_failed, count);

				dump_stack();

				     ext->rs_failed, count,

				     drbd_conn_str(mdev->state.conn));



				lc_put(mdev->resync, &ext->lce);

				drbd_force_state(mdev, NS(conn, C_DISCONNECTING));

				return;

				/* We don't expect to be able to clear more bits

				 * than have been set when we originally counted

				 * the set bits to cache that value in ext->rs_left.

				 * Whatever the reason (disconnect during resync,

				 * delayed local completion of an application write),

				 * try to fix it up by recounting here. */

				ext->rs_left = drbd_bm_e_weight(mdev, enr);

			}

		} else {

			/* Normally this element should be in the cache,
@@ -1192,6 +1243,7 @@ int drbd_rs_del_all(struct drbd_conf *mdev) 
		put_ldev(mdev);

	}

	spin_unlock_irq(&mdev->al_lock);

	wake_up(&mdev->al_wait);



	return 0;

}

drivers/block/drbd/drbd_bitmap.c

+107 −39
Original line number Diff line number Diff line
@@ -205,7 +205,7 @@ void drbd_bm_unlock(struct drbd_conf *mdev) 
static void bm_store_page_idx(struct page *page, unsigned long idx)

{

	BUG_ON(0 != (idx & ~BM_PAGE_IDX_MASK));

	page_private(page) |= idx;

	set_page_private(page, idx);

}



static unsigned long bm_page_to_idx(struct page *page)
@@ -886,12 +886,21 @@ void drbd_bm_clear_all(struct drbd_conf *mdev) 
struct bm_aio_ctx {

	struct drbd_conf *mdev;

	atomic_t in_flight;

	struct completion done;

	unsigned int done;

	unsigned flags;

#define BM_AIO_COPY_PAGES	1

	int error;

	struct kref kref;

};



static void bm_aio_ctx_destroy(struct kref *kref)

{

	struct bm_aio_ctx *ctx = container_of(kref, struct bm_aio_ctx, kref);



	put_ldev(ctx->mdev);

	kfree(ctx);

}



/* bv_page may be a copy, or may be the original */

static void bm_async_io_complete(struct bio *bio, int error)

{
@@ -930,20 +939,21 @@ static void bm_async_io_complete(struct bio *bio, int error) 


	bm_page_unlock_io(mdev, idx);



	/* FIXME give back to page pool */

	if (ctx->flags & BM_AIO_COPY_PAGES)

		put_page(bio->bi_io_vec[0].bv_page);

		mempool_free(bio->bi_io_vec[0].bv_page, drbd_md_io_page_pool);



	bio_put(bio);



	if (atomic_dec_and_test(&ctx->in_flight))

		complete(&ctx->done);

	if (atomic_dec_and_test(&ctx->in_flight)) {

		ctx->done = 1;

		wake_up(&mdev->misc_wait);

		kref_put(&ctx->kref, &bm_aio_ctx_destroy);

	}

}



static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must_hold(local)

{

	/* we are process context. we always get a bio */

	struct bio *bio = bio_alloc(GFP_KERNEL, 1);

	struct bio *bio = bio_alloc_drbd(GFP_NOIO);

	struct drbd_conf *mdev = ctx->mdev;

	struct drbd_bitmap *b = mdev->bitmap;

	struct page *page;
@@ -966,10 +976,8 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must 
	bm_set_page_unchanged(b->bm_pages[page_nr]);



	if (ctx->flags & BM_AIO_COPY_PAGES) {

		/* FIXME alloc_page is good enough for now, but actually needs

		 * to use pre-allocated page pool */

		void *src, *dest;

		page = alloc_page(__GFP_HIGHMEM|__GFP_WAIT);

		page = mempool_alloc(drbd_md_io_page_pool, __GFP_HIGHMEM|__GFP_WAIT);

		dest = kmap_atomic(page);

		src = kmap_atomic(b->bm_pages[page_nr]);

		memcpy(dest, src, PAGE_SIZE);
@@ -981,6 +989,8 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must 


	bio->bi_bdev = mdev->ldev->md_bdev;

	bio->bi_sector = on_disk_sector;

	/* bio_add_page of a single page to an empty bio will always succeed,

	 * according to api.  Do we want to assert that? */

	bio_add_page(bio, page, len, 0);

	bio->bi_private = ctx;

	bio->bi_end_io = bm_async_io_complete;
@@ -999,14 +1009,9 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must 
/*

 * bm_rw: read/write the whole bitmap from/to its on disk location.

 */

static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_idx) __must_hold(local)

static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_writeout_upper_idx) __must_hold(local)

{

	struct bm_aio_ctx ctx = {

		.mdev = mdev,

		.in_flight = ATOMIC_INIT(1),

		.done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),

		.flags = lazy_writeout_upper_idx ? BM_AIO_COPY_PAGES : 0,

	};

	struct bm_aio_ctx *ctx;

	struct drbd_bitmap *b = mdev->bitmap;

	int num_pages, i, count = 0;

	unsigned long now;
@@ -1021,7 +1026,27 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id 
	 * For lazy writeout, we don't care for ongoing changes to the bitmap,

	 * as we submit copies of pages anyways.

	 */

	if (!ctx.flags)



	ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);

	if (!ctx)

		return -ENOMEM;



	*ctx = (struct bm_aio_ctx) {

		.mdev = mdev,

		.in_flight = ATOMIC_INIT(1),

		.done = 0,

		.flags = flags,

		.error = 0,

		.kref = { ATOMIC_INIT(2) },

	};



	if (!get_ldev_if_state(mdev, D_ATTACHING)) {  /* put is in bm_aio_ctx_destroy() */

		dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in bm_rw()\n");

		kfree(ctx);

		return -ENODEV;

	}



	if (!ctx->flags)

		WARN_ON(!(BM_LOCKED_MASK & b->bm_flags));



	num_pages = b->bm_number_of_pages;
@@ -1046,29 +1071,38 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id 
				continue;

			}

		}

		atomic_inc(&ctx.in_flight);

		bm_page_io_async(&ctx, i, rw);

		atomic_inc(&ctx->in_flight);

		bm_page_io_async(ctx, i, rw);

		++count;

		cond_resched();

	}



	/*

	 * We initialize ctx.in_flight to one to make sure bm_async_io_complete

	 * will not complete() early, and decrement / test it here.  If there

	 * We initialize ctx->in_flight to one to make sure bm_async_io_complete

	 * will not set ctx->done early, and decrement / test it here.  If there

	 * are still some bios in flight, we need to wait for them here.

	 * If all IO is done already (or nothing had been submitted), there is

	 * no need to wait.  Still, we need to put the kref associated with the

	 * "in_flight reached zero, all done" event.

	 */

	if (!atomic_dec_and_test(&ctx.in_flight))

		wait_for_completion(&ctx.done);

	if (!atomic_dec_and_test(&ctx->in_flight))

		wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done);

	else

		kref_put(&ctx->kref, &bm_aio_ctx_destroy);



	dev_info(DEV, "bitmap %s of %u pages took %lu jiffies\n",

			rw == WRITE ? "WRITE" : "READ",

			count, jiffies - now);



	if (ctx.error) {

	if (ctx->error) {

		dev_alert(DEV, "we had at least one MD IO ERROR during bitmap IO\n");

		drbd_chk_io_error(mdev, 1, true);

		err = -EIO; /* ctx.error ? */

		err = -EIO; /* ctx->error ? */

	}



	if (atomic_read(&ctx->in_flight))

		err = -EIO; /* Disk failed during IO... */



	now = jiffies;

	if (rw == WRITE) {

		drbd_md_flush(mdev);
@@ -1082,6 +1116,7 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id 
	dev_info(DEV, "%s (%lu bits) marked out-of-sync by on disk bit-map.\n",

	     ppsize(ppb, now << (BM_BLOCK_SHIFT-10)), now);



	kref_put(&ctx->kref, &bm_aio_ctx_destroy);

	return err;

}
@@ -1091,7 +1126,7 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id 
 */

int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local)

{

	return bm_rw(mdev, READ, 0);

	return bm_rw(mdev, READ, 0, 0);

}



/**
@@ -1102,7 +1137,7 @@ int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local) 
 */

int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local)

{

	return bm_rw(mdev, WRITE, 0);

	return bm_rw(mdev, WRITE, 0, 0);

}



/**
@@ -1112,7 +1147,23 @@ int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local) 
 */

int drbd_bm_write_lazy(struct drbd_conf *mdev, unsigned upper_idx) __must_hold(local)

{

	return bm_rw(mdev, WRITE, upper_idx);

	return bm_rw(mdev, WRITE, BM_AIO_COPY_PAGES, upper_idx);

}



/**

 * drbd_bm_write_copy_pages() - Write the whole bitmap to its on disk location.

 * @mdev:	DRBD device.

 *

 * Will only write pages that have changed since last IO.

 * In contrast to drbd_bm_write(), this will copy the bitmap pages

 * to temporary writeout pages. It is intended to trigger a full write-out

 * while still allowing the bitmap to change, for example if a resync or online

 * verify is aborted due to a failed peer disk, while local IO continues, or

 * pending resync acks are still being processed.

 */

int drbd_bm_write_copy_pages(struct drbd_conf *mdev) __must_hold(local)

{

	return bm_rw(mdev, WRITE, BM_AIO_COPY_PAGES, 0);

}
@@ -1130,28 +1181,45 @@ int drbd_bm_write_lazy(struct drbd_conf *mdev, unsigned upper_idx) __must_hold(l 
 */

int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local)

{

	struct bm_aio_ctx ctx = {

	struct bm_aio_ctx *ctx;

	int err;



	if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {

		dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);

		return 0;

	}



	ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);

	if (!ctx)

		return -ENOMEM;



	*ctx = (struct bm_aio_ctx) {

		.mdev = mdev,

		.in_flight = ATOMIC_INIT(1),

		.done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),

		.done = 0,

		.flags = BM_AIO_COPY_PAGES,

		.error = 0,

		.kref = { ATOMIC_INIT(2) },

	};



	if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {

		dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);

		return 0;

	if (!get_ldev_if_state(mdev, D_ATTACHING)) {  /* put is in bm_aio_ctx_destroy() */

		dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in drbd_bm_write_page()\n");

		kfree(ctx);

		return -ENODEV;

	}



	bm_page_io_async(&ctx, idx, WRITE_SYNC);

	wait_for_completion(&ctx.done);

	bm_page_io_async(ctx, idx, WRITE_SYNC);

	wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done);



	if (ctx.error)

	if (ctx->error)

		drbd_chk_io_error(mdev, 1, true);

		/* that should force detach, so the in memory bitmap will be

		 * gone in a moment as well. */



	mdev->bm_writ_cnt++;

	return ctx.error;

	err = atomic_read(&ctx->in_flight) ? -EIO : ctx->error;

	kref_put(&ctx->kref, &bm_aio_ctx_destroy);

	return err;

}



/* NOTE

drivers/block/drbd/drbd_int.h

+55 −35
Original line number Diff line number Diff line
@@ -712,7 +712,6 @@ struct drbd_request { 
	struct list_head tl_requests; /* ring list in the transfer log */

	struct bio *master_bio;       /* master bio pointer */

	unsigned long rq_state; /* see comments above _req_mod() */

	int seq_num;

	unsigned long start_time;

};
@@ -851,6 +850,7 @@ enum { 
	NEW_CUR_UUID,		/* Create new current UUID when thawing IO */

	AL_SUSPENDED,		/* Activity logging is currently suspended. */

	AHEAD_TO_SYNC_SOURCE,   /* Ahead -> SyncSource queued */

	STATE_SENT,		/* Do not change state/UUIDs while this is set */

};



struct drbd_bitmap; /* opaque for drbd_conf */
@@ -862,31 +862,30 @@ enum bm_flag { 
	BM_P_VMALLOCED = 0x10000, /* internal use only, will be masked out */



	/* currently locked for bulk operation */

	BM_LOCKED_MASK = 0x7,

	BM_LOCKED_MASK = 0xf,



	/* in detail, that is: */

	BM_DONT_CLEAR = 0x1,

	BM_DONT_SET   = 0x2,

	BM_DONT_TEST  = 0x4,



	/* so we can mark it locked for bulk operation,

	 * and still allow all non-bulk operations */

	BM_IS_LOCKED  = 0x8,



	/* (test bit, count bit) allowed (common case) */

	BM_LOCKED_TEST_ALLOWED = 0x3,

	BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED,



	/* testing bits, as well as setting new bits allowed, but clearing bits

	 * would be unexpected.  Used during bitmap receive.  Setting new bits

	 * requires sending of "out-of-sync" information, though. */

	BM_LOCKED_SET_ALLOWED = 0x1,

	BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED,



	/* clear is not expected while bitmap is locked for bulk operation */

	/* for drbd_bm_write_copy_pages, everything is allowed,

	 * only concurrent bulk operations are locked out. */

	BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED,

};





/* TODO sort members for performance

 * MAYBE group them further */



/* THINK maybe we actually want to use the default "event/%s" worker threads

 * or similar in linux 2.6, which uses per cpu data and threads.

 */

struct drbd_work_queue {

	struct list_head q;

	struct semaphore s; /* producers up it, worker down()s it */
@@ -938,8 +937,7 @@ struct drbd_backing_dev { 
};



struct drbd_md_io {

	struct drbd_conf *mdev;

	struct completion event;

	unsigned int done;

	int error;

};
@@ -1022,6 +1020,7 @@ struct drbd_conf { 
	struct drbd_tl_epoch *newest_tle;

	struct drbd_tl_epoch *oldest_tle;

	struct list_head out_of_sequence_requests;

	struct list_head barrier_acked_requests;

	struct hlist_head *tl_hash;

	unsigned int tl_hash_s;
@@ -1056,6 +1055,8 @@ struct drbd_conf { 
	struct crypto_hash *csums_tfm;

	struct crypto_hash *verify_tfm;



	unsigned long last_reattach_jif;

	unsigned long last_reconnect_jif;

	struct drbd_thread receiver;

	struct drbd_thread worker;

	struct drbd_thread asender;
@@ -1094,7 +1095,8 @@ struct drbd_conf { 
	wait_queue_head_t ee_wait;

	struct page *md_io_page;	/* one page buffer for md_io */

	struct page *md_io_tmpp;	/* for logical_block_size != 512 */

	struct mutex md_io_mutex;	/* protects the md_io_buffer */

	struct drbd_md_io md_io;

	atomic_t md_io_in_use;		/* protects the md_io, md_io_page and md_io_tmpp */

	spinlock_t al_lock;

	wait_queue_head_t al_wait;

	struct lru_cache *act_log;	/* activity log */
@@ -1228,8 +1230,8 @@ extern int drbd_send_uuids(struct drbd_conf *mdev); 
extern int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev);

extern int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev);

extern int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags);

extern int _drbd_send_state(struct drbd_conf *mdev);

extern int drbd_send_state(struct drbd_conf *mdev);

extern int drbd_send_state(struct drbd_conf *mdev, union drbd_state s);

extern int drbd_send_current_state(struct drbd_conf *mdev);

extern int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,

			enum drbd_packets cmd, struct p_header80 *h,

			size_t size, unsigned msg_flags);
@@ -1461,6 +1463,7 @@ extern int drbd_bm_e_weight(struct drbd_conf *mdev, unsigned long enr); 
extern int  drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local);

extern int  drbd_bm_read(struct drbd_conf *mdev) __must_hold(local);

extern int  drbd_bm_write(struct drbd_conf *mdev) __must_hold(local);

extern int  drbd_bm_write_copy_pages(struct drbd_conf *mdev) __must_hold(local);

extern unsigned long drbd_bm_ALe_set_all(struct drbd_conf *mdev,

		unsigned long al_enr);

extern size_t	     drbd_bm_words(struct drbd_conf *mdev);
@@ -1493,11 +1496,38 @@ extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ 
extern mempool_t *drbd_request_mempool;

extern mempool_t *drbd_ee_mempool;



extern struct page *drbd_pp_pool; /* drbd's page pool */

/* drbd's page pool, used to buffer data received from the peer,

 * or data requested by the peer.

 *

 * This does not have an emergency reserve.

 *

 * When allocating from this pool, it first takes pages from the pool.

 * Only if the pool is depleted will try to allocate from the system.

 *

 * The assumption is that pages taken from this pool will be processed,

 * and given back, "quickly", and then can be recycled, so we can avoid

 * frequent calls to alloc_page(), and still will be able to make progress even

 * under memory pressure.

 */

extern struct page *drbd_pp_pool;

extern spinlock_t   drbd_pp_lock;

extern int	    drbd_pp_vacant;

extern wait_queue_head_t drbd_pp_wait;



/* We also need a standard (emergency-reserve backed) page pool

 * for meta data IO (activity log, bitmap).

 * We can keep it global, as long as it is used as "N pages at a time".

 * 128 should be plenty, currently we probably can get away with as few as 1.

 */

#define DRBD_MIN_POOL_PAGES	128

extern mempool_t *drbd_md_io_page_pool;



/* We also need to make sure we get a bio

 * when we need it for housekeeping purposes */

extern struct bio_set *drbd_md_io_bio_set;

/* to allocate from that set */

extern struct bio *bio_alloc_drbd(gfp_t gfp_mask);



extern rwlock_t global_state_lock;



extern struct drbd_conf *drbd_new_device(unsigned int minor);
@@ -1536,8 +1566,12 @@ extern void resume_next_sg(struct drbd_conf *mdev); 
extern void suspend_other_sg(struct drbd_conf *mdev);

extern int drbd_resync_finished(struct drbd_conf *mdev);

/* maybe rather drbd_main.c ? */

extern void *drbd_md_get_buffer(struct drbd_conf *mdev);

extern void drbd_md_put_buffer(struct drbd_conf *mdev);

extern int drbd_md_sync_page_io(struct drbd_conf *mdev,

				struct drbd_backing_dev *bdev, sector_t sector, int rw);

extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,

					    unsigned int *done);

extern void drbd_ov_oos_found(struct drbd_conf*, sector_t, int);

extern void drbd_rs_controller_reset(struct drbd_conf *mdev);
@@ -1754,19 +1788,6 @@ static inline struct page *page_chain_next(struct page *page) 
#define page_chain_for_each_safe(page, n) \

	for (; page && ({ n = page_chain_next(page); 1; }); page = n)



static inline int drbd_bio_has_active_page(struct bio *bio)

{

	struct bio_vec *bvec;

	int i;



	__bio_for_each_segment(bvec, bio, i, 0) {

		if (page_count(bvec->bv_page) > 1)

			return 1;

	}



	return 0;

}



static inline int drbd_ee_has_active_page(struct drbd_epoch_entry *e)

{

	struct page *page = e->pages;
@@ -1777,7 +1798,6 @@ static inline int drbd_ee_has_active_page(struct drbd_epoch_entry *e) 
	return 0;

}





static inline void drbd_state_lock(struct drbd_conf *mdev)

{

	wait_event(mdev->misc_wait,
@@ -2230,7 +2250,7 @@ static inline void drbd_get_syncer_progress(struct drbd_conf *mdev, 
		 * Note: currently we don't support such large bitmaps on 32bit

		 * arch anyways, but no harm done to be prepared for it here.

		 */

		unsigned int shift = mdev->rs_total >= (1ULL << 32) ? 16 : 10;

		unsigned int shift = mdev->rs_total > UINT_MAX ? 16 : 10;

		unsigned long left = *bits_left >> shift;

		unsigned long total = 1UL + (mdev->rs_total >> shift);

		unsigned long tmp = 1000UL - left * 1000UL/total;
@@ -2306,12 +2326,12 @@ static inline int drbd_state_is_stable(struct drbd_conf *mdev) 
	case D_OUTDATED:

	case D_CONSISTENT:

	case D_UP_TO_DATE:

	case D_FAILED:

		/* disk state is stable as well. */

		break;



	/* no new io accepted during tansitional states */

	case D_ATTACHING:

	case D_FAILED:

	case D_NEGOTIATING:

	case D_UNKNOWN:

	case D_MASK:

drivers/block/drbd/drbd_main.c

+269 −88

File changed.

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