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path: root/drivers/block/drbd/drbd_bitmap.c
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Diffstat (limited to 'drivers/block/drbd/drbd_bitmap.c')
-rw-r--r--drivers/block/drbd/drbd_bitmap.c146
1 files changed, 107 insertions, 39 deletions
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 3030201c69d..b5c5ff53cb5 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -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