diff options
Diffstat (limited to 'fs/btrfs/file-item.c')
| -rw-r--r-- | fs/btrfs/file-item.c | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index cccc75d15970..d431ea8198e4 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -413,6 +413,16 @@ fail: return ret; } +/* + * btrfs_csum_one_bio - Calculates checksums of the data contained inside a bio + * @inode: Owner of the data inside the bio + * @bio: Contains the data to be checksummed + * @file_start: offset in file this bio begins to describe + * @contig: Boolean. If true/1 means all bio vecs in this bio are + * contiguous and they begin at @file_start in the file. False/0 + * means this bio can contains potentially discontigous bio vecs + * so the logical offset of each should be calculated separately. + */ blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio, u64 file_start, int contig) { @@ -458,8 +468,6 @@ blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio, BUG_ON(!ordered); /* Logic error */ } - data = kmap_atomic(bvec.bv_page); - nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, bvec.bv_len + fs_info->sectorsize - 1); @@ -469,10 +477,9 @@ blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio, offset < ordered->file_offset) { unsigned long bytes_left; - kunmap_atomic(data); sums->len = this_sum_bytes; this_sum_bytes = 0; - btrfs_add_ordered_sum(inode, ordered, sums); + btrfs_add_ordered_sum(ordered, sums); btrfs_put_ordered_extent(ordered); bytes_left = bio->bi_iter.bi_size - total_bytes; @@ -489,16 +496,16 @@ blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio, sums->bytenr = ((u64)bio->bi_iter.bi_sector << 9) + total_bytes; index = 0; - - data = kmap_atomic(bvec.bv_page); } sums->sums[index] = ~(u32)0; + data = kmap_atomic(bvec.bv_page); sums->sums[index] = btrfs_csum_data(data + bvec.bv_offset + (i * fs_info->sectorsize), sums->sums[index], fs_info->sectorsize); + kunmap_atomic(data); btrfs_csum_final(sums->sums[index], (char *)(sums->sums + index)); index++; @@ -507,10 +514,9 @@ blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio, total_bytes += fs_info->sectorsize; } - kunmap_atomic(data); } this_sum_bytes = 0; - btrfs_add_ordered_sum(inode, ordered, sums); + btrfs_add_ordered_sum(ordered, sums); btrfs_put_ordered_extent(ordered); return 0; } @@ -551,7 +557,7 @@ static noinline void truncate_one_csum(struct btrfs_fs_info *fs_info, */ u32 new_size = (bytenr - key->offset) >> blocksize_bits; new_size *= csum_size; - btrfs_truncate_item(fs_info, path, new_size, 1); + btrfs_truncate_item(path, new_size, 1); } else if (key->offset >= bytenr && csum_end > end_byte && end_byte > key->offset) { /* @@ -563,7 +569,7 @@ static noinline void truncate_one_csum(struct btrfs_fs_info *fs_info, u32 new_size = (csum_end - end_byte) >> blocksize_bits; new_size *= csum_size; - btrfs_truncate_item(fs_info, path, new_size, 0); + btrfs_truncate_item(path, new_size, 0); key->offset = end_byte; btrfs_set_item_key_safe(fs_info, path, key); @@ -832,11 +838,11 @@ again: u32 diff; u32 free_space; - if (btrfs_leaf_free_space(fs_info, leaf) < + if (btrfs_leaf_free_space(leaf) < sizeof(struct btrfs_item) + csum_size * 2) goto insert; - free_space = btrfs_leaf_free_space(fs_info, leaf) - + free_space = btrfs_leaf_free_space(leaf) - sizeof(struct btrfs_item) - csum_size; tmp = sums->len - total_bytes; tmp >>= fs_info->sb->s_blocksize_bits; @@ -852,7 +858,7 @@ again: diff /= csum_size; diff *= csum_size; - btrfs_extend_item(fs_info, path, diff); + btrfs_extend_item(path, diff); ret = 0; goto csum; } |