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Btrfs: tree logging checksum fixes

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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 <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng
2009-01-06 11:42:00 -05:00
committed by Chris Mason
parent 1ba12553f3
commit 07d400a6df
4 changed files with 130 additions and 232 deletions
Download Patch File Download Diff File Expand all files Collapse all files
fs/btrfs/file-item.c
+36 -26
View File
@@ -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);
sector_sum = sums->sums;
sums->bytenr = start;
sums->len = size;
offset = (start - key.offset) >>
root->fs_info->sb->s_blocksize_bits;
offset *= csum_size;
csum_end = min(csum_end, end + 1);
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_csum_item);
while (size > 0) {
read_extent_buffer(path->nodes[0], &sector_sum->sum,
((unsigned long)item) + offset,
csum_size);
sector_sum->bytenr = start;
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);
size -= root->sectorsize;
start += root->sectorsize;
offset += csum_size;
sector_sum++;
sector_sum = sums->sums;
sums->bytenr = start;
sums->len = size;
offset = (start - key.offset) >>
root->fs_info->sb->s_blocksize_bits;
offset *= csum_size;
while (size > 0) {
read_extent_buffer(path->nodes[0],
&sector_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;