sizeof(struct btrfs_item) * 2) / \
BTRFS_CRC32_SIZE) - 1))
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 objectid, u64 pos,
- u64 offset, u64 disk_num_bytes,
- u64 num_bytes)
+ struct btrfs_root *root,
+ u64 objectid, u64 pos,
+ u64 disk_offset, u64 disk_num_bytes,
+ u64 num_bytes, u64 offset)
{
int ret = 0;
struct btrfs_file_extent_item *item;
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
- btrfs_set_file_extent_disk_bytenr(leaf, item, offset);
+ btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
- btrfs_set_file_extent_offset(leaf, item, 0);
+ btrfs_set_file_extent_offset(leaf, item, offset);
btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
btrfs_set_file_extent_generation(leaf, item, trans->transid);
btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
return ret;
}
+int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
+ struct bio *bio)
+{
+ u32 sum;
+ struct bio_vec *bvec = bio->bi_io_vec;
+ int bio_index = 0;
+ u64 offset;
+ u64 item_start_offset = 0;
+ u64 item_last_offset = 0;
+ u32 diff;
+ int ret;
+ struct btrfs_path *path;
+ struct btrfs_csum_item *item = NULL;
+ struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+
+ path = btrfs_alloc_path();
+ if (bio->bi_size > PAGE_CACHE_SIZE * 8)
+ path->reada = 2;
+
+ WARN_ON(bio->bi_vcnt <= 0);
+
+ while(bio_index < bio->bi_vcnt) {
+ offset = page_offset(bvec->bv_page) + bvec->bv_offset;
+ ret = btrfs_find_ordered_sum(inode, offset, &sum);
+ if (ret == 0)
+ goto found;
+
+ if (!item || offset < item_start_offset ||
+ offset >= item_last_offset) {
+ struct btrfs_key found_key;
+ u32 item_size;
+
+ if (item)
+ btrfs_release_path(root, path);
+ item = btrfs_lookup_csum(NULL, root, path,
+ inode->i_ino, offset, 0);
+ if (IS_ERR(item)) {
+ ret = PTR_ERR(item);
+ if (ret == -ENOENT || ret == -EFBIG)
+ ret = 0;
+ sum = 0;
+ printk("no csum found for inode %lu start "
+ "%llu\n", inode->i_ino,
+ (unsigned long long)offset);
+ item = NULL;
+ goto found;
+ }
+ btrfs_item_key_to_cpu(path->nodes[0], &found_key,
+ path->slots[0]);
+
+ item_start_offset = found_key.offset;
+ item_size = btrfs_item_size_nr(path->nodes[0],
+ path->slots[0]);
+ item_last_offset = item_start_offset +
+ (item_size / BTRFS_CRC32_SIZE) *
+ root->sectorsize;
+ item = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_csum_item);
+ }
+ /*
+ * this byte range must be able to fit inside
+ * a single leaf so it will also fit inside a u32
+ */
+ diff = offset - item_start_offset;
+ diff = diff / root->sectorsize;
+ diff = diff * BTRFS_CRC32_SIZE;
+
+ read_extent_buffer(path->nodes[0], &sum,
+ ((unsigned long)item) + diff,
+ BTRFS_CRC32_SIZE);
+found:
+ set_state_private(io_tree, offset, sum);
+ bio_index++;
+ bvec++;
+ }
+ btrfs_free_path(path);
+ return 0;
+}
+
+int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
+ struct bio *bio)
+{
+ struct btrfs_ordered_sum *sums;
+ struct btrfs_sector_sum *sector_sum;
+ struct btrfs_ordered_extent *ordered;
+ char *data;
+ struct bio_vec *bvec = bio->bi_io_vec;
+ int bio_index = 0;
+ unsigned long total_bytes = 0;
+ unsigned long this_sum_bytes = 0;
+ u64 offset;
+
+ WARN_ON(bio->bi_vcnt <= 0);
+ sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
+ if (!sums)
+ return -ENOMEM;
+
+ sector_sum = sums->sums;
+ sums->file_offset = page_offset(bvec->bv_page) + bvec->bv_offset;
+ sums->len = bio->bi_size;
+ INIT_LIST_HEAD(&sums->list);
+ ordered = btrfs_lookup_ordered_extent(inode, sums->file_offset);
+ BUG_ON(!ordered);
+
+ while(bio_index < bio->bi_vcnt) {
+ offset = page_offset(bvec->bv_page) + bvec->bv_offset;
+ if (offset >= ordered->file_offset + ordered->len ||
+ offset < ordered->file_offset) {
+ unsigned long bytes_left;
+ sums->len = this_sum_bytes;
+ this_sum_bytes = 0;
+ btrfs_add_ordered_sum(inode, ordered, sums);
+ btrfs_put_ordered_extent(ordered);
+
+ bytes_left = bio->bi_size - total_bytes;
+
+ sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
+ GFP_NOFS);
+ BUG_ON(!sums);
+ sector_sum = sums->sums;
+ sums->len = bytes_left;
+ sums->file_offset = offset;
+ ordered = btrfs_lookup_ordered_extent(inode,
+ sums->file_offset);
+ BUG_ON(!ordered);
+ }
+
+ data = kmap_atomic(bvec->bv_page, KM_USER0);
+ sector_sum->sum = ~(u32)0;
+ sector_sum->sum = btrfs_csum_data(root,
+ data + bvec->bv_offset,
+ sector_sum->sum,
+ bvec->bv_len);
+ kunmap_atomic(data, KM_USER0);
+ btrfs_csum_final(sector_sum->sum,
+ (char *)§or_sum->sum);
+ sector_sum->offset = page_offset(bvec->bv_page) +
+ bvec->bv_offset;
+
+ sector_sum++;
+ bio_index++;
+ total_bytes += bvec->bv_len;
+ this_sum_bytes += bvec->bv_len;
+ bvec++;
+ }
+ this_sum_bytes = 0;
+ btrfs_add_ordered_sum(inode, ordered, sums);
+ btrfs_put_ordered_extent(ordered);
+ return 0;
+}
+
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
- struct bio *bio)
+ struct btrfs_ordered_sum *sums)
{
u64 objectid = inode->i_ino;
u64 offset;
struct btrfs_key file_key;
struct btrfs_key found_key;
u64 next_offset;
+ u64 total_bytes = 0;
int found_next;
struct btrfs_path *path;
struct btrfs_csum_item *item;
struct btrfs_csum_item *item_end;
struct extent_buffer *leaf = NULL;
u64 csum_offset;
- u32 csum_result;
+ struct btrfs_sector_sum *sector_sum;
u32 nritems;
u32 ins_size;
- int bio_index = 0;
- struct bio_vec *bvec = bio->bi_io_vec;
- char *data;
char *eb_map;
char *eb_token;
unsigned long map_len;
path = btrfs_alloc_path();
BUG_ON(!path);
+ sector_sum = sums->sums;
again:
next_offset = (u64)-1;
found_next = 0;
- offset = page_offset(bvec->bv_page) + bvec->bv_offset;
+ offset = sector_sum->offset;
file_key.objectid = objectid;
file_key.offset = offset;
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
+ mutex_lock(&BTRFS_I(inode)->csum_mutex);
item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1);
if (!IS_ERR(item)) {
leaf = path->nodes[0];
+ ret = 0;
goto found;
}
ret = PTR_ERR(item);
ret = btrfs_search_slot(trans, root, &file_key, path,
BTRFS_CRC32_SIZE, 1);
if (ret < 0)
- goto fail;
+ goto fail_unlock;
if (ret == 0) {
BUG();
}
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
ins_size);
if (ret < 0)
- goto fail;
+ goto fail_unlock;
if (ret != 0) {
WARN_ON(1);
- goto fail;
+ goto fail_unlock;
}
csum:
leaf = path->nodes[0];
item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
btrfs_item_size_nr(leaf, path->slots[0]));
eb_token = NULL;
-next_bvec:
- data = kmap_atomic(bvec->bv_page, KM_IRQ0);
- csum_result = ~(u32)0;
- csum_result = btrfs_csum_data(root, data + bvec->bv_offset,
- csum_result, bvec->bv_len);
- kunmap_atomic(data, KM_IRQ0);
- btrfs_csum_final(csum_result, (char *)&csum_result);
- if (csum_result == 0) {
- printk("csum result is 0 for inode %lu offset %Lu\n", inode->i_ino, offset);
- }
+ mutex_unlock(&BTRFS_I(inode)->csum_mutex);
+ cond_resched();
+next_sector:
if (!eb_token ||
(unsigned long)item + BTRFS_CRC32_SIZE >= map_start + map_len) {
int err;
if (eb_token)
- unmap_extent_buffer(leaf, eb_token, KM_IRQ1);
+ unmap_extent_buffer(leaf, eb_token, KM_USER1);
eb_token = NULL;
err = map_private_extent_buffer(leaf, (unsigned long)item,
BTRFS_CRC32_SIZE,
&eb_token, &eb_map,
- &map_start, &map_len, KM_IRQ1);
+ &map_start, &map_len, KM_USER1);
if (err)
eb_token = NULL;
}
if (eb_token) {
memcpy(eb_token + ((unsigned long)item & (PAGE_CACHE_SIZE - 1)),
- &csum_result, BTRFS_CRC32_SIZE);
+ §or_sum->sum, BTRFS_CRC32_SIZE);
} else {
- write_extent_buffer(leaf, &csum_result, (unsigned long)item,
- BTRFS_CRC32_SIZE);
+ write_extent_buffer(leaf, §or_sum->sum,
+ (unsigned long)item, BTRFS_CRC32_SIZE);
}
- bio_index++;
- bvec++;
- if (bio_index < bio->bi_vcnt) {
+
+ total_bytes += root->sectorsize;
+ sector_sum++;
+ if (total_bytes < sums->len) {
item = (struct btrfs_csum_item *)((char *)item +
BTRFS_CRC32_SIZE);
if (item < item_end && offset + PAGE_CACHE_SIZE ==
- page_offset(bvec->bv_page)) {
- offset = page_offset(bvec->bv_page);
- goto next_bvec;
+ sector_sum->offset) {
+ offset = sector_sum->offset;
+ goto next_sector;
}
}
if (eb_token) {
- unmap_extent_buffer(leaf, eb_token, KM_IRQ1);
+ unmap_extent_buffer(leaf, eb_token, KM_USER1);
eb_token = NULL;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
- if (bio_index < bio->bi_vcnt) {
+ cond_resched();
+ if (total_bytes < sums->len) {
btrfs_release_path(root, path);
goto again;
}
-fail:
+out:
btrfs_free_path(path);
return ret;
+
+fail_unlock:
+ mutex_unlock(&BTRFS_I(inode)->csum_mutex);
+ goto out;
}
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
BUG_ON(ret);
return ret;
}
-
git.openpandora.org / pandora-kernel.git / blobdiff