diff options
Diffstat (limited to 'fs/btrfs/scrub.c')
| -rw-r--r-- | fs/btrfs/scrub.c | 883 |
1 files changed, 812 insertions, 71 deletions
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 460e30bb1884..61157a26cf2a 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -25,6 +25,7 @@ #include "transaction.h" #include "backref.h" #include "extent_io.h" +#include "dev-replace.h" #include "check-integrity.h" #include "rcu-string.h" @@ -44,8 +45,15 @@ struct scrub_block; struct scrub_ctx; -#define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */ -#define SCRUB_BIOS_PER_CTX 16 /* 1 MB per device in flight */ +/* + * the following three values only influence the performance. + * The last one configures the number of parallel and outstanding I/O + * operations. The first two values configure an upper limit for the number + * of (dynamically allocated) pages that are added to a bio. + */ +#define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ +#define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ +#define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ /* * the following value times PAGE_SIZE needs to be large enough to match the @@ -62,6 +70,7 @@ struct scrub_page { u64 generation; u64 logical; u64 physical; + u64 physical_for_dev_replace; atomic_t ref_count; struct { unsigned int mirror_num:8; @@ -79,7 +88,11 @@ struct scrub_bio { int err; u64 logical; u64 physical; - struct scrub_page *pagev[SCRUB_PAGES_PER_BIO]; +#if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO + struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; +#else + struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; +#endif int page_count; int next_free; struct btrfs_work work; @@ -99,8 +112,16 @@ struct scrub_block { }; }; +struct scrub_wr_ctx { + struct scrub_bio *wr_curr_bio; + struct btrfs_device *tgtdev; + int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ + atomic_t flush_all_writes; + struct mutex wr_lock; +}; + struct scrub_ctx { - struct scrub_bio *bios[SCRUB_BIOS_PER_CTX]; + struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; struct btrfs_root *dev_root; int first_free; int curr; @@ -112,12 +133,13 @@ struct scrub_ctx { struct list_head csum_list; atomic_t cancel_req; int readonly; - int pages_per_bio; /* <= SCRUB_PAGES_PER_BIO */ + int pages_per_rd_bio; u32 sectorsize; u32 nodesize; u32 leafsize; int is_dev_replace; + struct scrub_wr_ctx wr_ctx; /* * statistics @@ -135,6 +157,15 @@ struct scrub_fixup_nodatasum { int mirror_num; }; +struct scrub_copy_nocow_ctx { + struct scrub_ctx *sctx; + u64 logical; + u64 len; + int mirror_num; + u64 physical_for_dev_replace; + struct btrfs_work work; +}; + struct scrub_warning { struct btrfs_path *path; u64 extent_item_size; @@ -156,8 +187,9 @@ static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); static int scrub_setup_recheck_block(struct scrub_ctx *sctx, struct btrfs_fs_info *fs_info, + struct scrub_block *original_sblock, u64 length, u64 logical, - struct scrub_block *sblock); + struct scrub_block *sblocks_for_recheck); static void scrub_recheck_block(struct btrfs_fs_info *fs_info, struct scrub_block *sblock, int is_metadata, int have_csum, u8 *csum, u64 generation, @@ -174,6 +206,9 @@ static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, struct scrub_block *sblock_good, int page_num, int force_write); +static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); +static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, + int page_num); static int scrub_checksum_data(struct scrub_block *sblock); static int scrub_checksum_tree_block(struct scrub_block *sblock); static int scrub_checksum_super(struct scrub_block *sblock); @@ -181,14 +216,38 @@ static void scrub_block_get(struct scrub_block *sblock); static void scrub_block_put(struct scrub_block *sblock); static void scrub_page_get(struct scrub_page *spage); static void scrub_page_put(struct scrub_page *spage); -static int scrub_add_page_to_bio(struct scrub_ctx *sctx, - struct scrub_page *spage); +static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, + struct scrub_page *spage); static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, u64 physical, struct btrfs_device *dev, u64 flags, - u64 gen, int mirror_num, u8 *csum, int force); + u64 gen, int mirror_num, u8 *csum, int force, + u64 physical_for_dev_replace); static void scrub_bio_end_io(struct bio *bio, int err); static void scrub_bio_end_io_worker(struct btrfs_work *work); static void scrub_block_complete(struct scrub_block *sblock); +static void scrub_remap_extent(struct btrfs_fs_info *fs_info, + u64 extent_logical, u64 extent_len, + u64 *extent_physical, + struct btrfs_device **extent_dev, + int *extent_mirror_num); +static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, + struct scrub_wr_ctx *wr_ctx, + struct btrfs_fs_info *fs_info, + struct btrfs_device *dev, + int is_dev_replace); +static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); +static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, + struct scrub_page *spage); +static void scrub_wr_submit(struct scrub_ctx *sctx); +static void scrub_wr_bio_end_io(struct bio *bio, int err); +static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); +static int write_page_nocow(struct scrub_ctx *sctx, + u64 physical_for_dev_replace, struct page *page); +static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, + void *ctx); +static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, + int mirror_num, u64 physical_for_dev_replace); +static void copy_nocow_pages_worker(struct btrfs_work *work); static void scrub_pending_bio_inc(struct scrub_ctx *sctx) @@ -262,19 +321,20 @@ static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) if (!sctx) return; + scrub_free_wr_ctx(&sctx->wr_ctx); + /* this can happen when scrub is cancelled */ if (sctx->curr != -1) { struct scrub_bio *sbio = sctx->bios[sctx->curr]; for (i = 0; i < sbio->page_count; i++) { - BUG_ON(!sbio->pagev[i]); - BUG_ON(!sbio->pagev[i]->page); + WARN_ON(!sbio->pagev[i]->page); scrub_block_put(sbio->pagev[i]->sblock); } bio_put(sbio->bio); } - for (i = 0; i < SCRUB_BIOS_PER_CTX; ++i) { + for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { struct scrub_bio *sbio = sctx->bios[i]; if (!sbio) @@ -292,18 +352,29 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) struct scrub_ctx *sctx; int i; struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; - int pages_per_bio; + int pages_per_rd_bio; + int ret; - pages_per_bio = min_t(int, SCRUB_PAGES_PER_BIO, - bio_get_nr_vecs(dev->bdev)); + /* + * the setting of pages_per_rd_bio is correct for scrub but might + * be wrong for the dev_replace code where we might read from + * different devices in the initial huge bios. However, that + * code is able to correctly handle the case when adding a page + * to a bio fails. + */ + if (dev->bdev) + pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO, + bio_get_nr_vecs(dev->bdev)); + else + pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; sctx = kzalloc(sizeof(*sctx), GFP_NOFS); if (!sctx) goto nomem; sctx->is_dev_replace = is_dev_replace; - sctx->pages_per_bio = pages_per_bio; + sctx->pages_per_rd_bio = pages_per_rd_bio; sctx->curr = -1; sctx->dev_root = dev->dev_root; - for (i = 0; i < SCRUB_BIOS_PER_CTX; ++i) { + for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { struct scrub_bio *sbio; sbio = kzalloc(sizeof(*sbio), GFP_NOFS); @@ -316,7 +387,7 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) sbio->page_count = 0; sbio->work.func = scrub_bio_end_io_worker; - if (i != SCRUB_BIOS_PER_CTX - 1) + if (i != SCRUB_BIOS_PER_SCTX - 1) sctx->bios[i]->next_free = i + 1; else sctx->bios[i]->next_free = -1; @@ -334,6 +405,13 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) spin_lock_init(&sctx->list_lock); spin_lock_init(&sctx->stat_lock); init_waitqueue_head(&sctx->list_wait); + + ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, + fs_info->dev_replace.tgtdev, is_dev_replace); + if (ret) { + scrub_free_ctx(sctx); + return ERR_PTR(ret); + } return sctx; nomem: @@ -341,7 +419,8 @@ nomem: return ERR_PTR(-ENOMEM); } -static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx) +static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, + void *warn_ctx) { u64 isize; u32 nlink; @@ -349,7 +428,7 @@ static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx) int i; struct extent_buffer *eb; struct btrfs_inode_item *inode_item; - struct scrub_warning *swarn = ctx; + struct scrub_warning *swarn = warn_ctx; struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; struct inode_fs_paths *ipath = NULL; struct btrfs_root *local_root; @@ -492,11 +571,11 @@ out: kfree(swarn.msg_buf); } -static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *ctx) +static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) { struct page *page = NULL; unsigned long index; - struct scrub_fixup_nodatasum *fixup = ctx; + struct scrub_fixup_nodatasum *fixup = fixup_ctx; int ret; int corrected = 0; struct btrfs_key key; @@ -660,7 +739,9 @@ out: spin_lock(&sctx->stat_lock); ++sctx->stat.uncorrectable_errors; spin_unlock(&sctx->stat_lock); - + btrfs_dev_replace_stats_inc( + &sctx->dev_root->fs_info->dev_replace. + num_uncorrectable_read_errors); printk_ratelimited_in_rcu(KERN_ERR "btrfs: unable to fixup (nodatasum) error at logical %llu on dev %s\n", (unsigned long long)fixup->logical, @@ -715,6 +796,11 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) csum = sblock_to_check->pagev[0]->csum; dev = sblock_to_check->pagev[0]->dev; + if (sctx->is_dev_replace && !is_metadata && !have_csum) { + sblocks_for_recheck = NULL; + goto nodatasum_case; + } + /* * read all mirrors one after the other. This includes to * re-read the extent or metadata block that failed (that was @@ -758,7 +844,7 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) } /* setup the context, map the logical blocks and alloc the pages */ - ret = scrub_setup_recheck_block(sctx, fs_info, length, + ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, logical, sblocks_for_recheck); if (ret) { spin_lock(&sctx->stat_lock); @@ -789,6 +875,8 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) sctx->stat.unverified_errors++; spin_unlock(&sctx->stat_lock); + if (sctx->is_dev_replace) + scrub_write_block_to_dev_replace(sblock_bad); goto out; } @@ -822,12 +910,15 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) BTRFS_DEV_STAT_CORRUPTION_ERRS); } - if (sctx->readonly) + if (sctx->readonly && !sctx->is_dev_replace) goto did_not_correct_error; if (!is_metadata && !have_csum) { struct scrub_fixup_nodatasum *fixup_nodatasum; +nodatasum_case: + WARN_ON(sctx->is_dev_replace); + /* * !is_metadata and !have_csum, this means that the data * might not be COW'ed, that it might be modified @@ -883,18 +974,79 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) if (!sblock_other->header_error && !sblock_other->checksum_error && sblock_other->no_io_error_seen) { - int force_write = is_metadata || have_csum; - - ret = scrub_repair_block_from_good_copy(sblock_bad, - sblock_other, - force_write); + if (sctx->is_dev_replace) { + scrub_write_block_to_dev_replace(sblock_other); + } else { + int force_write = is_metadata || have_csum; + + ret = scrub_repair_block_from_good_copy( + sblock_bad, sblock_other, + force_write); + } if (0 == ret) goto corrected_error; } } /* - * in case of I/O errors in the area that is supposed to be + * for dev_replace, pick good pages and write to the target device. + */ + if (sctx->is_dev_replace) { + success = 1; + for (page_num = 0; page_num < sblock_bad->page_count; + page_num++) { + int sub_success; + + sub_success = 0; + for (mirror_index = 0; + mirror_index < BTRFS_MAX_MIRRORS && + sblocks_for_recheck[mirror_index].page_count > 0; + mirror_index++) { + struct scrub_block *sblock_other = + sblocks_for_recheck + mirror_index; + struct scrub_page *page_other = + sblock_other->pagev[page_num]; + + if (!page_other->io_error) { + ret = scrub_write_page_to_dev_replace( + sblock_other, page_num); + if (ret == 0) { + /* succeeded for this page */ + sub_success = 1; + break; + } else { + btrfs_dev_replace_stats_inc( + &sctx->dev_root-> + fs_info->dev_replace. + num_write_errors); + } + } + } + + if (!sub_success) { + /* + * did not find a mirror to fetch the page + * from. scrub_write_page_to_dev_replace() + * handles this case (page->io_error), by + * filling the block with zeros before + * submitting the write request + */ + success = 0; + ret = scrub_write_page_to_dev_replace( + sblock_bad, page_num); + if (ret) + btrfs_dev_replace_stats_inc( + &sctx->dev_root->fs_info-> + dev_replace.num_write_errors); + } + } + + goto out; + } + + /* + * for regular scrub, repair those pages that are errored. + * In case of I/O errors in the area that is supposed to be * repaired, continue by picking good copies of those pages. * Select the good pages from mirrors to rewrite bad pages from * the area to fix. Afterwards verify the checksum of the block @@ -1017,6 +1169,7 @@ out: static int scrub_setup_recheck_block(struct scrub_ctx *sctx, struct btrfs_fs_info *fs_info, + struct scrub_block *original_sblock, u64 length, u64 logical, struct scrub_block *sblocks_for_recheck) { @@ -1047,7 +1200,7 @@ static int scrub_setup_recheck_block(struct scrub_ctx *sctx, return -EIO; } - BUG_ON(page_index >= SCRUB_PAGES_PER_BIO); + BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); for (mirror_index = 0; mirror_index < (int)bbio->num_stripes; mirror_index++) { struct scrub_block *sblock; @@ -1071,6 +1224,10 @@ leave_nomem: sblock->pagev[page_index] = page; page->logical = logical; page->physical = bbio->stripes[mirror_index].physical; + BUG_ON(page_index >= original_sblock->page_count); + page->physical_for_dev_replace = + original_sblock->pagev[page_index]-> + physical_for_dev_replace; /* for missing devices, dev->bdev is NULL */ page->dev = bbio->stripes[mirror_index].dev; page->mirror_num = mirror_index + 1; @@ -1249,6 +1406,12 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, int ret; DECLARE_COMPLETION_ONSTACK(complete); + if (!page_bad->dev->bdev) { + printk_ratelimited(KERN_WARNING + "btrfs: scrub_repair_page_from_good_copy(bdev == NULL) is unexpected!\n"); + return -EIO; + } + bio = bio_alloc(GFP_NOFS, 1); if (!bio) return -EIO; @@ -1269,6 +1432,9 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, if (!bio_flagged(bio, BIO_UPTODATE)) { btrfs_dev_stat_inc_and_print(page_bad->dev, BTRFS_DEV_STAT_WRITE_ERRS); + btrfs_dev_replace_stats_inc( + &sblock_bad->sctx->dev_root->fs_info-> + dev_replace.num_write_errors); bio_put(bio); return -EIO; } @@ -1278,7 +1444,168 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, return 0; } -static void scrub_checksum(struct scrub_block *sblock) +static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) +{ + int page_num; + + for (page_num = 0; page_num < sblock->page_count; page_num++) { + int ret; + + ret = scrub_write_page_to_dev_replace(sblock, page_num); + if (ret) + btrfs_dev_replace_stats_inc( + &sblock->sctx->dev_root->fs_info->dev_replace. + num_write_errors); + } +} + +static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, + int page_num) +{ + struct scrub_page *spage = sblock->pagev[page_num]; + + BUG_ON(spage->page == NULL); + if (spage->io_error) { + void *mapped_buffer = kmap_atomic(spage->page); + + memset(mapped_buffer, 0, PAGE_CACHE_SIZE); + flush_dcache_page(spage->page); + kunmap_atomic(mapped_buffer); + } + return scrub_add_page_to_wr_bio(sblock->sctx, spage); +} + +static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, + struct scrub_page *spage) +{ + struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; + struct scrub_bio *sbio; + int ret; + + mutex_lock(&wr_ctx->wr_lock); +again: + if (!wr_ctx->wr_curr_bio) { + wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), + GFP_NOFS); + if (!wr_ctx->wr_curr_bio) { + mutex_unlock(&wr_ctx->wr_lock); + return -ENOMEM; + } + wr_ctx->wr_curr_bio->sctx = sctx; + wr_ctx->wr_curr_bio->page_count = 0; + } + sbio = wr_ctx->wr_curr_bio; + if (sbio->page_count == 0) { + struct bio *bio; + + sbio->physical = spage->physical_for_dev_replace; + sbio->logical = spage->logical; + sbio->dev = wr_ctx->tgtdev; + bio = sbio->bio; + if (!bio) { + bio = bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); + if (!bio) { + mutex_unlock(&wr_ctx->wr_lock); + return -ENOMEM; + } + sbio->bio = bio; + } + + bio->bi_private = sbio; + bio->bi_end_io = scrub_wr_bio_end_io; + bio->bi_bdev = sbio->dev->bdev; + bio->bi_sector = sbio->physical >> 9; + sbio->err = 0; + } else if (sbio->physical + sbio->page_count * PAGE_SIZE != + spage->physical_for_dev_replace || + sbio->logical + sbio->page_count * PAGE_SIZE != + spage->logical) { + scrub_wr_submit(sctx); + goto again; + } + + ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); + if (ret != PAGE_SIZE) { + if (sbio->page_count < 1) { + bio_put(sbio->bio); + sbio->bio = NULL; + mutex_unlock(&wr_ctx->wr_lock); + return -EIO; + } + scrub_wr_submit(sctx); + goto again; + } + + sbio->pagev[sbio->page_count] = spage; + scrub_page_get(spage); + sbio->page_count++; + if (sbio->page_count == wr_ctx->pages_per_wr_bio) + scrub_wr_submit(sctx); + mutex_unlock(&wr_ctx->wr_lock); + + return 0; +} + +static void scrub_wr_submit(struct scrub_ctx *sctx) +{ + struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; + struct scrub_bio *sbio; + + if (!wr_ctx->wr_curr_bio) + return; + + sbio = wr_ctx->wr_curr_bio; + wr_ctx->wr_curr_bio = NULL; + WARN_ON(!sbio->bio->bi_bdev); + scrub_pending_bio_inc(sctx); + /* process all writes in a single worker thread. Then the block layer + * orders the requests before sending them to the driver which + * doubled the write performance on spinning disks when measured + * with Linux 3.5 */ + btrfsic_submit_bio(WRITE, sbio->bio); +} + +static void scrub_wr_bio_end_io(struct bio *bio, int err) +{ + struct scrub_bio *sbio = bio->bi_private; + struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; + + sbio->err = err; + sbio->bio = bio; + + sbio->work.func = scrub_wr_bio_end_io_worker; + btrfs_queue_worker(&fs_info->scrub_wr_completion_workers, &sbio->work); +} + +static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) +{ + struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); + struct scrub_ctx *sctx = sbio->sctx; + int i; + + WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); + if (sbio->err) { + struct btrfs_dev_replace *dev_replace = + &sbio->sctx->dev_root->fs_info->dev_replace; + + for (i = 0; i < sbio->page_count; i++) { + struct scrub_page *spage = sbio->pagev[i]; + + spage->io_error = 1; + btrfs_dev_replace_stats_inc(&dev_replace-> + num_write_errors); + } + } + + for (i = 0; i < sbio->page_count; i++) + scrub_page_put(sbio->pagev[i]); + + bio_put(sbio->bio); + kfree(sbio); + scrub_pending_bio_dec(sctx); +} + +static int scrub_checksum(struct scrub_block *sblock) { u64 flags; int ret; @@ -1296,6 +1623,8 @@ static void scrub_checksum(struct scrub_block *sblock) WARN_ON(1); if (ret) scrub_handle_errored_block(sblock); + + return ret; } static int scrub_checksum_data(struct scrub_block *sblock) @@ -1386,7 +1715,7 @@ static int scrub_checksum_tree_block(struct scrub_block *sblock) BTRFS_UUID_SIZE)) ++fail; - BUG_ON(sctx->nodesize != sctx->leafsize); + WARN_ON(sctx->nodesize != sctx->leafsize); len = sctx->nodesize - BTRFS_CSUM_SIZE; mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; @@ -1534,11 +1863,24 @@ static void scrub_submit(struct scrub_ctx *sctx) sctx->curr = -1; scrub_pending_bio_inc(sctx); - btrfsic_submit_bio(READ, sbio->bio); + if (!sbio->bio->bi_bdev) { + /* + * this case should not happen. If btrfs_map_block() is + * wrong, it could happen for dev-replace operations on + * missing devices when no mirrors are available, but in + * this case it should already fail the mount. + * This case is handled correctly (but _very_ slowly). + */ + printk_ratelimited(KERN_WARNING + "btrfs: scrub_submit(bio bdev == NULL) is unexpected!\n"); + bio_endio(sbio->bio, -EIO); + } else { + btrfsic_submit_bio(READ, sbio->bio); + } } -static int scrub_add_page_to_bio(struct scrub_ctx *sctx, - struct scrub_page *spage) +static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, + struct scrub_page *spage) { struct scrub_block *sblock = spage->sblock; struct scrub_bio *sbio; @@ -1570,7 +1912,7 @@ again: sbio->dev = spage->dev; bio = sbio->bio; if (!bio) { - bio = bio_alloc(GFP_NOFS, sctx->pages_per_bio); + bio = bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); if (!bio) return -ENOMEM; sbio->bio = bio; @@ -1602,10 +1944,10 @@ again: goto again; } - scrub_block_get(sblock); /* one for the added page */ + scrub_block_get(sblock); /* one for the page added to the bio */ atomic_inc(&sblock->outstanding_pages); sbio->page_count++; - if (sbio->page_count == sctx->pages_per_bio) + if (sbio->page_count == sctx->pages_per_rd_bio) scrub_submit(sctx); return 0; @@ -1613,7 +1955,8 @@ again: static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, u64 physical, struct btrfs_device *dev, u64 flags, - u64 gen, int mirror_num, u8 *csum, int force) + u64 gen, int mirror_num, u8 *csum, int force, + u64 physical_for_dev_replace) { struct scrub_block *sblock; int index; @@ -1654,6 +1997,7 @@ leave_nomem: spage->generation = gen; spage->logical = logical; spage->physical = physical; + spage->physical_for_dev_replace = physical_for_dev_replace; spage->mirror_num = mirror_num; if (csum) { spage->have_csum = 1; @@ -1668,6 +2012,7 @@ leave_nomem: len -= l; logical += l; physical += l; + physical_for_dev_replace += l; } WARN_ON(sblock->page_count == 0); @@ -1675,7 +2020,7 @@ leave_nomem: struct scrub_page *spage = sblock->pagev[index]; int ret; - ret = scrub_add_page_to_bio(sctx, spage); + ret = scrub_add_page_to_rd_bio(sctx, spage); if (ret) { scrub_block_put(sblock); return ret; @@ -1707,7 +2052,7 @@ static void scrub_bio_end_io_worker(struct btrfs_work *work) struct scrub_ctx *sctx = sbio->sctx; int i; - BUG_ON(sbio->page_count > SCRUB_PAGES_PER_BIO); + BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); if (sbio->err) { for (i = 0; i < sbio->page_count; i++) { struct scrub_page *spage = sbio->pagev[i]; @@ -1733,15 +2078,30 @@ static void scrub_bio_end_io_worker(struct btrfs_work *work) sbio->next_free = sctx->first_free; sctx->first_free = sbio->index; spin_unlock(&sctx->list_lock); + + if (sctx->is_dev_replace && + atomic_read(&sctx->wr_ctx.flush_all_writes)) { + mutex_lock(&sctx->wr_ctx.wr_lock); + scrub_wr_submit(sctx); + mutex_unlock(&sctx->wr_ctx.wr_lock); + } + scrub_pending_bio_dec(sctx); } static void scrub_block_complete(struct scrub_block *sblock) { - if (!sblock->no_io_error_seen) + if (!sblock->no_io_error_seen) { scrub_handle_errored_block(sblock); - else - scrub_checksum(sblock); + } else { + /* + * if has checksum error, write via repair mechanism in + * dev replace case, otherwise write here in dev replace + * case. + */ + if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace) + scrub_write_block_to_dev_replace(sblock); + } } static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, @@ -1786,7 +2146,7 @@ static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, /* scrub extent tries to collect up to 64 kB for each bio */ static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, u64 physical, struct btrfs_device *dev, u64 flags, - u64 gen, int mirror_num) + u64 gen, int mirror_num, u64 physical_for_dev_replace) { int ret; u8 csum[BTRFS_CSUM_SIZE]; @@ -1799,7 +2159,7 @@ static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, sctx->stat.data_bytes_scrubbed += len; spin_unlock(&sctx->stat_lock); } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { - BUG_ON(sctx->nodesize != sctx->leafsize); + WARN_ON(sctx->nodesize != sctx->leafsize); blocksize = sctx->nodesize; spin_lock(&sctx->stat_lock); sctx->stat.tree_extents_scrubbed++; @@ -1807,7 +2167,7 @@ static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, spin_unlock(&sctx->stat_lock); } else { blocksize = sctx->sectorsize; - BUG_ON(1); + WARN_ON(1); } while (len) { @@ -1819,14 +2179,23 @@ static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, have_csum = scrub_find_csum(sctx, logical, l, csum); if (have_csum == 0) ++sctx->stat.no_csum; + if (sctx->is_dev_replace && !have_csum) { + ret = copy_nocow_pages(sctx, logical, l, + mirror_num, + physical_for_dev_replace); + goto behind_scrub_pages; + } } ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, - mirror_num, have_csum ? csum : NULL, 0); + mirror_num, have_csum ? csum : NULL, 0, + physical_for_dev_replace); +behind_scrub_pages: if (ret) return ret; len -= l; logical += l; physical += l; + physical_for_dev_replace += l; } return 0; } @@ -1834,7 +2203,8 @@ static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, struct map_lookup *map, struct btrfs_device *scrub_dev, - int num, u64 base, u64 length) + int num, u64 base, u64 length, + int is_dev_replace) { struct btrfs_path *path; struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; @@ -1859,6 +2229,11 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, struct btrfs_key key_end; u64 increment = map->stripe_len; u64 offset; + u64 extent_logical; + u64 extent_physical; + u64 extent_len; + struct btrfs_device *extent_dev; + int extent_mirror_num; nstripes = length; offset = 0; @@ -1966,9 +2341,14 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, */ if (atomic_read(&fs_info->scrub_pause_req)) { /* push queued extents */ + atomic_set(&sctx->wr_ctx.flush_all_writes, 1); scrub_submit(sctx); + mutex_lock(&sctx->wr_ctx.wr_lock); + scrub_wr_submit(sctx); + mutex_unlock(&sctx->wr_ctx.wr_lock); wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); + atomic_set(&sctx->wr_ctx.flush_all_writes, 0); atomic_inc(&fs_info->scrubs_paused); wake_up(&fs_info->scrub_pause_wait); mutex_lock(&fs_info->scrub_lock); @@ -2063,10 +2443,20 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, key.objectid; } - ret = scrub_extent(sctx, key.objectid, key.offset, - key.objectid - logical + physical, - scrub_dev, flags, generation, - mirror_num); + extent_logical = key.objectid; + extent_physical = key.objectid - logical + physical; + extent_len = key.offset; + extent_dev = scrub_dev; + extent_mirror_num = mirror_num; + if (is_dev_replace) + scrub_remap_extent(fs_info, extent_logical, + extent_len, &extent_physical, + &extent_dev, + &extent_mirror_num); + ret = scrub_extent(sctx, extent_logical, extent_len, + extent_physical, extent_dev, flags, + generation, extent_mirror_num, + key.objectid - logical + physical); if (ret) goto out; @@ -2080,10 +2470,13 @@ next: sctx->stat.last_physical = physical; spin_unlock(&sctx->stat_lock); } +out: /* push queued extents */ scrub_submit(sctx); + mutex_lock(&sctx->wr_ctx.wr_lock); + scrub_wr_submit(sctx); + mutex_unlock(&sctx->wr_ctx.wr_lock); -out: blk_finish_plug(&plug); btrfs_free_path(path); return ret < 0 ? ret : 0; @@ -2093,14 +2486,14 @@ static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, struct btrfs_device *scrub_dev, u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length, - u64 dev_offset) + u64 dev_offset, int is_dev_replace) { struct btrfs_mapping_tree *map_tree = &sctx->dev_root->fs_info->mapping_tree; struct map_lookup *map; struct extent_map *em; int i; - int ret = -EINVAL; + int ret = 0; read_lock(&map_tree->map_tree.lock); em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); @@ -2120,7 +2513,8 @@ static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, if (map->stripes[i].dev->bdev == scrub_dev->bdev && map->stripes[i].physical == dev_offset) { ret = scrub_stripe(sctx, map, scrub_dev, i, - chunk_offset, length); + chunk_offset, length, + is_dev_replace); if (ret) goto out; } @@ -2133,7 +2527,8 @@ out: static noinline_for_stack int scrub_enumerate_chunks(struct scrub_ctx *sctx, - struct btrfs_device *scrub_dev, u64 start, u64 end) + struct btrfs_device *scrub_dev, u64 start, u64 end, + int is_dev_replace) { struct btrfs_dev_extent *dev_extent = NULL; struct btrfs_path *path; @@ -2149,6 +2544,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, struct btrfs_key key; struct btrfs_key found_key; struct btrfs_block_group_cache *cache; + struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; path = btrfs_alloc_path(); if (!path) @@ -2214,11 +2610,61 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, ret = -ENOENT; break; } + dev_replace->cursor_right = found_key.offset + length; + dev_replace->cursor_left = found_key.offset; + dev_replace->item_needs_writeback = 1; ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, - chunk_offset, length, found_key.offset); + chunk_offset, length, found_key.offset, + is_dev_replace); + + /* + * flush, submit all pending read and write bios, afterwards + * wait for them. + * Note that in the dev replace case, a read request causes + * write requests that are submitted in the read completion + * worker. Therefore in the current situation, it is required + * that all write requests are flushed, so that all read and + * write requests are really completed when bios_in_flight + * changes to 0. + */ + atomic_set(&sctx->wr_ctx.flush_all_writes, 1); + scrub_submit(sctx); + mutex_lock(&sctx->wr_ctx.wr_lock); + scrub_wr_submit(sctx); + mutex_unlock(&sctx->wr_ctx.wr_lock); + + wait_event(sctx->list_wait, + atomic_read(&sctx->bios_in_flight) == 0); + atomic_set(&sctx->wr_ctx.flush_all_writes, 0); + atomic_inc(&fs_info->scrubs_paused); + wake_up(&fs_info->scrub_pause_wait); + wait_event(sctx->list_wait, + atomic_read(&sctx->workers_pending) == 0); + + mutex_lock(&fs_info->scrub_lock); + while (atomic_read(&fs_info->scrub_pause_req)) { + mutex_unlock(&fs_info->scrub_lock); + wait_event(fs_info->scrub_pause_wait, + atomic_read(&fs_info->scrub_pause_req) == 0); + mutex_lock(&fs_info->scrub_lock); + } + atomic_dec(&fs_info->scrubs_paused); + mutex_unlock(&fs_info->scrub_lock); + wake_up(&fs_info->scrub_pause_wait); + + dev_replace->cursor_left = dev_replace->cursor_right; + dev_replace->item_needs_writeback = 1; btrfs_put_block_group(cache); if (ret) break; + if (atomic64_read(&dev_replace->num_write_errors) > 0) { + ret = -EIO; + break; + } + if (sctx->stat.malloc_errors > 0) { + ret = -ENOMEM; + break; + } key.offset = found_key.offset + length; btrfs_release_path(path); @@ -2254,7 +2700,7 @@ static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, - NULL, 1); + NULL, 1, bytenr); if (ret) return ret; } @@ -2266,18 +2712,38 @@ static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, /* * get a reference count on fs_info->scrub_workers. start worker if necessary */ -static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info) +static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, + int is_dev_replace) { int ret = 0; mutex_lock(&fs_info->scrub_lock); if (fs_info->scrub_workers_refcnt == 0) { - btrfs_init_workers(&fs_info->scrub_workers, "scrub", - fs_info->thread_pool_size, &fs_info->generic_worker); + if (is_dev_replace) + btrfs_init_workers(&fs_info->scrub_workers, "scrub", 1, + &fs_info->generic_worker); + else + btrfs_init_workers(&fs_info->scrub_workers, "scrub", + fs_info->thread_pool_size, + &fs_info->generic_worker); fs_info->scrub_workers.idle_thresh = 4; ret = btrfs_start_workers(&fs_info->scrub_workers); if (ret) goto out; + btrfs_init_workers(&fs_info->scrub_wr_completion_workers, + "scrubwrc", + fs_info->thread_pool_size, + &fs_info->generic_worker); + fs_info->scrub_wr_completion_workers.idle_thresh = 2; + ret = btrfs_start_workers( + &fs_info->scrub_wr_completion_workers); + if (ret) + goto out; + btrfs_init_workers(&fs_info->scrub_nocow_workers, "scrubnc", 1, + &fs_info->generic_worker); + ret = btrfs_start_workers(&fs_info->scrub_nocow_workers); + if (ret) + goto out; } ++fs_info->scrub_workers_refcnt; out: @@ -2289,8 +2755,11 @@ out: static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) { mutex_lock(&fs_info->scrub_lock); - if (--fs_info->scrub_workers_refcnt == 0) + if (--fs_info->scrub_workers_refcnt == 0) { btrfs_stop_workers(&fs_info->scrub_workers); + btrfs_stop_workers(&fs_info->scrub_wr_completion_workers); + btrfs_stop_workers(&fs_info->scrub_nocow_workers); + } WARN_ON(fs_info->scrub_workers_refcnt < 0); mutex_unlock(&fs_info->scrub_lock); } @@ -2354,7 +2823,7 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, return -EINVAL; } - ret = scrub_workers_get(fs_info); + ret = scrub_workers_get(fs_info, is_dev_replace); if (ret) return ret; @@ -2394,12 +2863,15 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, mutex_unlock(&fs_info->scrub_lock); mutex_unlock(&fs_info->fs_devices->device_list_mutex); - down_read(&fs_info->scrub_super_lock); - ret = scrub_supers(sctx, dev); - up_read(&fs_info->scrub_super_lock); + if (!is_dev_replace) { + down_read(&fs_info->scrub_super_lock); + ret = scrub_supers(sctx, dev); + up_read(&fs_info->scrub_super_lock); + } if (!ret) - ret = scrub_enumerate_chunks(sctx, dev, start, end); + ret = scrub_enumerate_chunks(sctx, dev, start, end, + is_dev_replace); wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); atomic_dec(&fs_info->scrubs_running); @@ -2537,3 +3009,272 @@ int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; } + +static void scrub_remap_extent(struct btrfs_fs_info *fs_info, + u64 extent_logical, u64 extent_len, + u64 *extent_physical, + struct btrfs_device **extent_dev, + int *extent_mirror_num) +{ + u64 mapped_length; + struct btrfs_bio *bbio = NULL; + int ret; + + mapped_length = extent_len; + ret = btrfs_map_block(fs_info, READ, extent_logical, + &mapped_length, &bbio, 0); + if (ret || !bbio || mapped_length < extent_len || + !bbio->stripes[0].dev->bdev) { + kfree(bbio); + return; + } + + *extent_physical = bbio->stripes[0].physical; + *extent_mirror_num = bbio->mirror_num; + *extent_dev = bbio->stripes[0].dev; + kfree(bbio); +} + +static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, + struct scrub_wr_ctx *wr_ctx, + struct btrfs_fs_info *fs_info, + struct btrfs_device *dev, + int is_dev_replace) +{ + WARN_ON(wr_ctx->wr_curr_bio != NULL); + + mutex_init(&wr_ctx->wr_lock); + wr_ctx->wr_curr_bio = NULL; + if (!is_dev_replace) + return 0; + + WARN_ON(!dev->bdev); + wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, + bio_get_nr_vecs(dev->bdev)); + wr_ctx->tgtdev = dev; + atomic_set(&wr_ctx->flush_all_writes, 0); + return 0; +} + +static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) +{ + mutex_lock(&wr_ctx->wr_lock); + kfree(wr_ctx->wr_curr_bio); + wr_ctx->wr_curr_bio = NULL; + mutex_unlock(&wr_ctx->wr_lock); +} + +static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, + int mirror_num, u64 physical_for_dev_replace) +{ + struct scrub_copy_nocow_ctx *nocow_ctx; + struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; + + nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); + if (!nocow_ctx) { + spin_lock(&sctx->stat_lock); + sctx->stat.malloc_errors++; + spin_unlock(&sctx->stat_lock); + return -ENOMEM; + } + + scrub_pending_trans_workers_inc(sctx); + + nocow_ctx->sctx = sctx; + nocow_ctx->logical = logical; + nocow_ctx->len = len; + nocow_ctx->mirror_num = mirror_num; + nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; + nocow_ctx->work.func = copy_nocow_pages_worker; + btrfs_queue_worker(&fs_info->scrub_nocow_workers, + &nocow_ctx->work); + + return 0; +} + +static void copy_nocow_pages_worker(struct btrfs_work *work) +{ + struct scrub_copy_nocow_ctx *nocow_ctx = + container_of(work, struct scrub_copy_nocow_ctx, work); + struct scrub_ctx *sctx = nocow_ctx->sctx; + u64 logical = nocow_ctx->logical; + u64 len = nocow_ctx->len; + int mirror_num = nocow_ctx->mirror_num; + u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; + int ret; + struct btrfs_trans_handle *trans = NULL; + struct btrfs_fs_info *fs_info; + struct btrfs_path *path; + struct btrfs_root *root; + int not_written = 0; + + fs_info = sctx->dev_root->fs_info; + root = fs_info->extent_root; + + path = btrfs_alloc_path(); + if (!path) { + spin_lock(&sctx->stat_lock); + sctx->stat.malloc_errors++; + spin_unlock(&sctx->stat_lock); + not_written = 1; + goto out; + } + + trans = btrfs_join_transaction(root); + if (IS_ERR(trans)) { + not_written = 1; + goto out; + } + + ret = iterate_inodes_from_logical(logical, fs_info, path, + copy_nocow_pages_for_inode, + nocow_ctx); + if (ret != 0 && ret != -ENOENT) { + pr_warn("iterate_inodes_from_logical() failed: log %llu, phys %llu, len %llu, mir %llu, ret %d\n", + (unsigned long long)logical, + (unsigned long long)physical_for_dev_replace, + (unsigned long long)len, + (unsigned long long)mirror_num, ret); + not_written = 1; + goto out; + } + +out: + if (trans && !IS_ERR(trans)) + btrfs_end_transaction(trans, root); + if (not_written) + btrfs_dev_replace_stats_inc(&fs_info->dev_replace. + num_uncorrectable_read_errors); + + btrfs_free_path(path); + kfree(nocow_ctx); + + scrub_pending_trans_workers_dec(sctx); +} + +static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, void *ctx) +{ + unsigned long index; + struct scrub_copy_nocow_ctx *nocow_ctx = ctx; + int ret = 0; + struct btrfs_key key; + struct inode *inode = NULL; + struct btrfs_root *local_root; + u64 physical_for_dev_replace; + u64 len; + struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; + + key.objectid = root; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + local_root = btrfs_read_fs_root_no_name(fs_info, &key); + if (IS_ERR(local_root)) + return PTR_ERR(local_root); + + key.type = BTRFS_INODE_ITEM_KEY; + key.objectid = inum; + key.offset = 0; + inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; + len = nocow_ctx->len; + while (len >= PAGE_CACHE_SIZE) { + struct page *page = NULL; + int ret_sub; + + index = offset >> PAGE_CACHE_SHIFT; + + page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); + if (!page) { + pr_err("find_or_create_page() failed\n"); + ret = -ENOMEM; + goto next_page; + } + + if (PageUptodate(page)) { + if (PageDirty(page)) + goto next_page; + } else { + ClearPageError(page); + ret_sub = extent_read_full_page(&BTRFS_I(inode)-> + io_tree, + page, btrfs_get_extent, + nocow_ctx->mirror_num); + if (ret_sub) { + ret = ret_sub; + goto next_page; + } + wait_on_page_locked(page); + if (!PageUptodate(page)) { + ret = -EIO; + goto next_page; + } + } + ret_sub = write_page_nocow(nocow_ctx->sctx, + physical_for_dev_replace, page); + if (ret_sub) { + ret = ret_sub; + goto next_page; + } + +next_page: + if (page) { + unlock_page(page); + put_page(page); + } + offset += PAGE_CACHE_SIZE; + physical_for_dev_replace += PAGE_CACHE_SIZE; + len -= PAGE_CACHE_SIZE; + } + + if (inode) + iput(inode); + return ret; +} + +static int write_page_nocow(struct scrub_ctx *sctx, + u64 physical_for_dev_replace, struct page *page) +{ + struct bio *bio; + struct btrfs_device *dev; + int ret; + DECLARE_COMPLETION_ONSTACK(compl); + + dev = sctx->wr_ctx.tgtdev; + if (!dev) + return -EIO; + if (!dev->bdev) { + printk_ratelimited(KERN_WARNING + "btrfs: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); + return -EIO; + } + bio = bio_alloc(GFP_NOFS, 1); + if (!bio) { + spin_lock(&sctx->stat_lock); + sctx->stat.malloc_errors++; + spin_unlock(&sctx->stat_lock); + return -ENOMEM; + } + bio->bi_private = &compl; + bio->bi_end_io = scrub_complete_bio_end_io; + bio->bi_size = 0; + bio->bi_sector = physical_for_dev_replace >> 9; + bio->bi_bdev = dev->bdev; + ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); + if (ret != PAGE_CACHE_SIZE) { +leave_with_eio: + bio_put(bio); + btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); + return -EIO; + } + btrfsic_submit_bio(WRITE_SYNC, bio); + wait_for_completion(&compl); + + if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) + goto leave_with_eio; + + bio_put(bio); + return 0; +} |