u64 length, u64 logical, struct page *page,
unsigned int pg_offset, int mirror_num)
{
- struct btrfs_device *dev;
+ struct btrfs_io_stripe smap = { 0 };
struct bio_vec bvec;
struct bio bio;
- u64 map_length = 0;
- u64 sector;
- struct btrfs_io_context *bioc = NULL;
int ret = 0;
ASSERT(!(fs_info->sb->s_flags & SB_RDONLY));
if (btrfs_repair_one_zone(fs_info, logical))
return 0;
- map_length = length;
-
/*
* Avoid races with device replace and make sure our bioc has devices
* associated to its stripes that don't go away while we are doing the
* read repair operation.
*/
btrfs_bio_counter_inc_blocked(fs_info);
- if (btrfs_is_parity_mirror(fs_info, logical, length)) {
- /*
- * Note that we don't use BTRFS_MAP_WRITE because it's supposed
- * to update all raid stripes, but here we just want to correct
- * bad stripe, thus BTRFS_MAP_READ is abused to only get the bad
- * stripe's dev and sector.
- */
- ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, logical,
- &map_length, &bioc, 0);
- if (ret)
- goto out_counter_dec;
- ASSERT(bioc->mirror_num == 1);
- } else {
- ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,
- &map_length, &bioc, mirror_num);
- if (ret)
- goto out_counter_dec;
- /*
- * This happens when dev-replace is also running, and the
- * mirror_num indicates the dev-replace target.
- *
- * In this case, we don't need to do anything, as the read
- * error just means the replace progress hasn't reached our
- * read range, and later replace routine would handle it well.
- */
- if (mirror_num != bioc->mirror_num)
- goto out_counter_dec;
- }
-
- sector = bioc->stripes[bioc->mirror_num - 1].physical >> 9;
- dev = bioc->stripes[bioc->mirror_num - 1].dev;
- btrfs_put_bioc(bioc);
+ ret = btrfs_map_repair_block(fs_info, &smap, logical, length, mirror_num);
+ if (ret < 0)
+ goto out_counter_dec;
- if (!dev || !dev->bdev ||
- !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) {
+ if (!smap.dev->bdev ||
+ !test_bit(BTRFS_DEV_STATE_WRITEABLE, &smap.dev->dev_state)) {
ret = -EIO;
goto out_counter_dec;
}
- bio_init(&bio, dev->bdev, &bvec, 1, REQ_OP_WRITE | REQ_SYNC);
- bio.bi_iter.bi_sector = sector;
+ bio_init(&bio, smap.dev->bdev, &bvec, 1, REQ_OP_WRITE | REQ_SYNC);
+ bio.bi_iter.bi_sector = smap.physical >> SECTOR_SHIFT;
__bio_add_page(&bio, page, length, pg_offset);
btrfsic_check_bio(&bio);
ret = submit_bio_wait(&bio);
if (ret) {
/* try to remap that extent elsewhere? */
- btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
+ btrfs_dev_stat_inc_and_print(smap.dev, BTRFS_DEV_STAT_WRITE_ERRS);
goto out_bio_uninit;
}
btrfs_info_rl_in_rcu(fs_info,
"read error corrected: ino %llu off %llu (dev %s sector %llu)",
- ino, start, btrfs_dev_name(dev), sector);
+ ino, start, btrfs_dev_name(smap.dev),
+ smap.physical >> SECTOR_SHIFT);
ret = 0;
out_bio_uninit:
return ret;
}
+/*
+ * Submit a btrfs_bio based repair write.
+ *
+ * If @dev_replace is true, the write would be submitted to dev-replace target.
+ */
+void btrfs_submit_repair_write(struct btrfs_bio *bbio, int mirror_num, bool dev_replace)
+{
+ struct btrfs_fs_info *fs_info = bbio->fs_info;
+ u64 logical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT;
+ u64 length = bbio->bio.bi_iter.bi_size;
+ struct btrfs_io_stripe smap = { 0 };
+ int ret;
+
+ ASSERT(fs_info);
+ ASSERT(mirror_num > 0);
+ ASSERT(btrfs_op(&bbio->bio) == BTRFS_MAP_WRITE);
+ ASSERT(!bbio->inode);
+
+ btrfs_bio_counter_inc_blocked(fs_info);
+ ret = btrfs_map_repair_block(fs_info, &smap, logical, length, mirror_num);
+ if (ret < 0)
+ goto fail;
+
+ if (dev_replace) {
+ if (btrfs_op(&bbio->bio) == BTRFS_MAP_WRITE && btrfs_is_zoned(fs_info)) {
+ bbio->bio.bi_opf &= ~REQ_OP_WRITE;
+ bbio->bio.bi_opf |= REQ_OP_ZONE_APPEND;
+ }
+ ASSERT(smap.dev == fs_info->dev_replace.srcdev);
+ smap.dev = fs_info->dev_replace.tgtdev;
+ }
+ __btrfs_submit_bio(&bbio->bio, NULL, &smap, mirror_num);
+ return;
+
+fail:
+ btrfs_bio_counter_dec(fs_info);
+ btrfs_bio_end_io(bbio, errno_to_blk_status(ret));
+}
+
int __init btrfs_bioset_init(void)
{
if (bioset_init(&btrfs_bioset, BIO_POOL_SIZE,
return true;
}
+
+static void map_raid56_repair_block(struct btrfs_io_context *bioc,
+ struct btrfs_io_stripe *smap,
+ u64 logical)
+{
+ int data_stripes = nr_bioc_data_stripes(bioc);
+ int i;
+
+ for (i = 0; i < data_stripes; i++) {
+ u64 stripe_start = bioc->full_stripe_logical +
+ (i << BTRFS_STRIPE_LEN_SHIFT);
+
+ if (logical >= stripe_start &&
+ logical < stripe_start + BTRFS_STRIPE_LEN)
+ break;
+ }
+ ASSERT(i < data_stripes);
+ smap->dev = bioc->stripes[i].dev;
+ smap->physical = bioc->stripes[i].physical +
+ ((logical - bioc->full_stripe_logical) &
+ BTRFS_STRIPE_LEN_MASK);
+}
+
+/*
+ * Map a repair write into a single device.
+ *
+ * A repair write is triggered by read time repair or scrub, which would only
+ * update the contents of a single device.
+ * Not update any other mirrors nor go through RMW path.
+ *
+ * Callers should ensure:
+ *
+ * - Call btrfs_bio_counter_inc_blocked() first
+ * - The range does not cross stripe boundary
+ * - Has a valid @mirror_num passed in.
+ */
+int btrfs_map_repair_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_io_stripe *smap, u64 logical,
+ u32 length, int mirror_num)
+{
+ struct btrfs_io_context *bioc = NULL;
+ u64 map_length = length;
+ int mirror_ret = mirror_num;
+ int ret;
+
+ ASSERT(mirror_num > 0);
+
+ ret = __btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical, &map_length,
+ &bioc, smap, &mirror_ret, true);
+ if (ret < 0)
+ return ret;
+
+ /* The map range should not cross stripe boundary. */
+ ASSERT(map_length >= length);
+
+ /* Already mapped to single stripe. */
+ if (!bioc)
+ goto out;
+
+ /* Map the RAID56 multi-stripe writes to a single one. */
+ if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
+ map_raid56_repair_block(bioc, smap, logical);
+ goto out;
+ }
+
+ ASSERT(mirror_num <= bioc->num_stripes);
+ smap->dev = bioc->stripes[mirror_num - 1].dev;
+ smap->physical = bioc->stripes[mirror_num - 1].physical;
+out:
+ btrfs_put_bioc(bioc);
+ ASSERT(smap->dev);
+ return 0;
+}
projects / linux.git / commitdiff