From 07d400a6df4767a90d49a153fdb7f4cfa1e3f23e Mon Sep 17 00:00:00 2001 From: Yan Zheng Date: Tue, 6 Jan 2009 11:42:00 -0500 Subject: Btrfs: tree logging checksum fixes This patch contains following things. 1) Limit the max size of btrfs_ordered_sum structure to PAGE_SIZE. This struct is kmalloced so we want to keep it reasonable. 2) Replace copy_extent_csums by btrfs_lookup_csums_range. This was duplicated code in tree-log.c 3) Remove replay_one_csum. csum items are replayed at the same time as replaying file extents. This guarantees we only replay useful csums. 4) nbytes accounting fix. Signed-off-by: Yan Zheng --- fs/btrfs/file-item.c | 62 ++++++++++++++++++++++++++++++---------------------- 1 file changed, 36 insertions(+), 26 deletions(-) (limited to 'fs/btrfs/file-item.c') diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index b11abfad81a5..964652435fd1 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -27,6 +27,12 @@ #define MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \ sizeof(struct btrfs_item) * 2) / \ size) - 1)) + +#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \ + sizeof(struct btrfs_ordered_sum)) / \ + sizeof(struct btrfs_sector_sum) * \ + (r)->sectorsize - (r)->sectorsize) + int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 objectid, u64 pos, @@ -259,8 +265,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, key.offset = start; key.type = BTRFS_EXTENT_CSUM_KEY; - ret = btrfs_search_slot(NULL, root->fs_info->csum_root, - &key, path, 0, 0); + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto fail; if (ret > 0 && path->slots[0] > 0) { @@ -279,7 +284,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, while (start <= end) { leaf = path->nodes[0]; if (path->slots[0] >= btrfs_header_nritems(leaf)) { - ret = btrfs_next_leaf(root->fs_info->csum_root, path); + ret = btrfs_next_leaf(root, path); if (ret < 0) goto fail; if (ret > 0) @@ -306,33 +311,38 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, continue; } - size = min(csum_end, end + 1) - start; - sums = kzalloc(btrfs_ordered_sum_size(root, size), GFP_NOFS); - BUG_ON(!sums); + csum_end = min(csum_end, end + 1); + item = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_csum_item); + while (start < csum_end) { + size = min_t(size_t, csum_end - start, + MAX_ORDERED_SUM_BYTES(root)); + sums = kzalloc(btrfs_ordered_sum_size(root, size), + GFP_NOFS); + BUG_ON(!sums); - sector_sum = sums->sums; - sums->bytenr = start; - sums->len = size; + sector_sum = sums->sums; + sums->bytenr = start; + sums->len = size; - offset = (start - key.offset) >> - root->fs_info->sb->s_blocksize_bits; - offset *= csum_size; + offset = (start - key.offset) >> + root->fs_info->sb->s_blocksize_bits; + offset *= csum_size; - item = btrfs_item_ptr(path->nodes[0], path->slots[0], - struct btrfs_csum_item); - while (size > 0) { - read_extent_buffer(path->nodes[0], §or_sum->sum, - ((unsigned long)item) + offset, - csum_size); - sector_sum->bytenr = start; - - size -= root->sectorsize; - start += root->sectorsize; - offset += csum_size; - sector_sum++; + while (size > 0) { + read_extent_buffer(path->nodes[0], + §or_sum->sum, + ((unsigned long)item) + + offset, csum_size); + sector_sum->bytenr = start; + + size -= root->sectorsize; + start += root->sectorsize; + offset += csum_size; + sector_sum++; + } + list_add_tail(&sums->list, list); } - list_add_tail(&sums->list, list); - path->slots[0]++; } ret = 0; -- cgit v1.2.3