2007-06-12 07:07:21 -06:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public
|
|
|
|
* License v2 as published by the Free Software Foundation.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
* General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public
|
|
|
|
* License along with this program; if not, write to the
|
|
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
|
* Boston, MA 021110-1307, USA.
|
|
|
|
*/
|
|
|
|
|
2008-02-20 10:07:25 -07:00
|
|
|
#include <linux/bio.h>
|
|
|
|
#include <linux/pagemap.h>
|
|
|
|
#include <linux/highmem.h>
|
2007-03-15 17:03:33 -06:00
|
|
|
#include "ctree.h"
|
2007-03-26 14:00:06 -06:00
|
|
|
#include "disk-io.h"
|
2007-03-20 12:38:32 -06:00
|
|
|
#include "transaction.h"
|
2007-05-29 13:17:08 -06:00
|
|
|
#include "print-tree.h"
|
2007-03-15 17:03:33 -06:00
|
|
|
|
2007-04-16 07:22:45 -06:00
|
|
|
#define MAX_CSUM_ITEMS(r) ((((BTRFS_LEAF_DATA_SIZE(r) - \
|
2007-05-10 10:36:17 -06:00
|
|
|
sizeof(struct btrfs_item) * 2) / \
|
|
|
|
BTRFS_CRC32_SIZE) - 1))
|
2007-04-17 11:26:50 -06:00
|
|
|
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
|
2008-05-02 12:43:14 -06:00
|
|
|
struct btrfs_root *root,
|
|
|
|
u64 objectid, u64 pos,
|
|
|
|
u64 disk_offset, u64 disk_num_bytes,
|
|
|
|
u64 num_bytes, u64 offset)
|
2007-03-20 12:38:32 -06:00
|
|
|
{
|
2007-03-26 14:00:06 -06:00
|
|
|
int ret = 0;
|
|
|
|
struct btrfs_file_extent_item *item;
|
|
|
|
struct btrfs_key file_key;
|
2007-04-02 09:20:42 -06:00
|
|
|
struct btrfs_path *path;
|
2007-10-15 14:14:19 -06:00
|
|
|
struct extent_buffer *leaf;
|
2007-03-26 14:00:06 -06:00
|
|
|
|
2007-04-02 09:20:42 -06:00
|
|
|
path = btrfs_alloc_path();
|
|
|
|
BUG_ON(!path);
|
2007-03-26 14:00:06 -06:00
|
|
|
file_key.objectid = objectid;
|
2007-04-17 11:26:50 -06:00
|
|
|
file_key.offset = pos;
|
2007-03-26 14:00:06 -06:00
|
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
|
|
|
|
|
2007-04-02 09:20:42 -06:00
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
2007-03-26 14:00:06 -06:00
|
|
|
sizeof(*item));
|
2007-06-22 12:16:25 -06:00
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
2007-03-27 09:26:26 -06:00
|
|
|
BUG_ON(ret);
|
2007-10-15 14:14:19 -06:00
|
|
|
leaf = path->nodes[0];
|
|
|
|
item = btrfs_item_ptr(leaf, path->slots[0],
|
2007-03-26 14:00:06 -06:00
|
|
|
struct btrfs_file_extent_item);
|
2008-05-02 12:43:14 -06:00
|
|
|
btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
|
2007-10-15 14:15:53 -06:00
|
|
|
btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
|
2008-05-02 12:43:14 -06:00
|
|
|
btrfs_set_file_extent_offset(leaf, item, offset);
|
2007-10-15 14:15:53 -06:00
|
|
|
btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
|
2007-10-15 14:14:19 -06:00
|
|
|
btrfs_set_file_extent_generation(leaf, item, trans->transid);
|
|
|
|
btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
2007-06-22 12:16:25 -06:00
|
|
|
out:
|
2007-04-02 09:20:42 -06:00
|
|
|
btrfs_free_path(path);
|
2007-06-22 12:16:25 -06:00
|
|
|
return ret;
|
2007-03-20 12:38:32 -06:00
|
|
|
}
|
2007-03-26 14:00:06 -06:00
|
|
|
|
2007-04-17 11:26:50 -06:00
|
|
|
struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root,
|
|
|
|
struct btrfs_path *path,
|
|
|
|
u64 objectid, u64 offset,
|
|
|
|
int cow)
|
2007-04-16 07:22:45 -06:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key file_key;
|
|
|
|
struct btrfs_key found_key;
|
|
|
|
struct btrfs_csum_item *item;
|
2007-10-15 14:14:19 -06:00
|
|
|
struct extent_buffer *leaf;
|
2007-04-16 07:22:45 -06:00
|
|
|
u64 csum_offset = 0;
|
2007-04-18 14:15:28 -06:00
|
|
|
int csums_in_item;
|
2007-04-16 07:22:45 -06:00
|
|
|
|
|
|
|
file_key.objectid = objectid;
|
|
|
|
file_key.offset = offset;
|
|
|
|
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
|
2007-04-17 11:26:50 -06:00
|
|
|
ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
|
2007-04-16 07:22:45 -06:00
|
|
|
if (ret < 0)
|
|
|
|
goto fail;
|
2007-10-15 14:14:19 -06:00
|
|
|
leaf = path->nodes[0];
|
2007-04-16 07:22:45 -06:00
|
|
|
if (ret > 0) {
|
|
|
|
ret = 1;
|
2007-04-17 13:39:32 -06:00
|
|
|
if (path->slots[0] == 0)
|
2007-04-16 07:22:45 -06:00
|
|
|
goto fail;
|
|
|
|
path->slots[0]--;
|
2007-10-15 14:14:19 -06:00
|
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
2007-04-16 07:22:45 -06:00
|
|
|
if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
|
|
|
|
found_key.objectid != objectid) {
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
csum_offset = (offset - found_key.offset) >>
|
|
|
|
root->fs_info->sb->s_blocksize_bits;
|
2007-10-15 14:14:19 -06:00
|
|
|
csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
|
2007-05-10 10:36:17 -06:00
|
|
|
csums_in_item /= BTRFS_CRC32_SIZE;
|
2007-04-18 14:15:28 -06:00
|
|
|
|
|
|
|
if (csum_offset >= csums_in_item) {
|
|
|
|
ret = -EFBIG;
|
2007-04-16 07:22:45 -06:00
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
|
2007-05-10 10:36:17 -06:00
|
|
|
item = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
|
|
csum_offset * BTRFS_CRC32_SIZE);
|
2007-04-16 07:22:45 -06:00
|
|
|
return item;
|
|
|
|
fail:
|
|
|
|
if (ret > 0)
|
2007-04-17 11:26:50 -06:00
|
|
|
ret = -ENOENT;
|
2007-04-16 07:22:45 -06:00
|
|
|
return ERR_PTR(ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-03-26 14:00:06 -06:00
|
|
|
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root,
|
|
|
|
struct btrfs_path *path, u64 objectid,
|
2007-03-27 09:26:26 -06:00
|
|
|
u64 offset, int mod)
|
2007-03-26 14:00:06 -06:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key file_key;
|
|
|
|
int ins_len = mod < 0 ? -1 : 0;
|
|
|
|
int cow = mod != 0;
|
|
|
|
|
|
|
|
file_key.objectid = objectid;
|
2007-04-17 13:39:32 -06:00
|
|
|
file_key.offset = offset;
|
2007-03-26 14:00:06 -06:00
|
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
|
|
|
|
ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
|
|
|
|
return ret;
|
|
|
|
}
|
2007-03-29 13:15:27 -06:00
|
|
|
|
2008-07-18 04:17:13 -06:00
|
|
|
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
|
|
|
|
struct bio *bio)
|
2008-04-16 09:15:20 -06:00
|
|
|
{
|
2008-07-17 10:53:50 -06:00
|
|
|
struct btrfs_ordered_sum *sums;
|
|
|
|
struct btrfs_sector_sum *sector_sum;
|
2008-07-18 04:17:13 -06:00
|
|
|
struct btrfs_ordered_extent *ordered;
|
2008-04-16 09:15:20 -06:00
|
|
|
char *data;
|
|
|
|
struct bio_vec *bvec = bio->bi_io_vec;
|
|
|
|
int bio_index = 0;
|
2008-07-18 04:17:13 -06:00
|
|
|
unsigned long total_bytes = 0;
|
|
|
|
unsigned long this_sum_bytes = 0;
|
|
|
|
u64 offset;
|
2008-04-16 09:15:20 -06:00
|
|
|
|
2008-07-17 10:53:50 -06:00
|
|
|
WARN_ON(bio->bi_vcnt <= 0);
|
|
|
|
sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
|
2008-04-16 09:15:20 -06:00
|
|
|
if (!sums)
|
|
|
|
return -ENOMEM;
|
2008-07-18 04:17:13 -06:00
|
|
|
|
2008-07-17 10:53:50 -06:00
|
|
|
sector_sum = &sums->sums;
|
2008-07-18 04:17:13 -06:00
|
|
|
sums->file_offset = page_offset(bvec->bv_page) + bvec->bv_offset;
|
2008-07-17 10:53:50 -06:00
|
|
|
sums->len = bio->bi_size;
|
|
|
|
INIT_LIST_HEAD(&sums->list);
|
2008-07-18 04:17:13 -06:00
|
|
|
ordered = btrfs_lookup_ordered_extent(inode, sums->file_offset);
|
|
|
|
BUG_ON(!ordered);
|
2008-04-16 09:15:20 -06:00
|
|
|
|
|
|
|
while(bio_index < bio->bi_vcnt) {
|
2008-07-18 04:17:13 -06:00
|
|
|
offset = page_offset(bvec->bv_page) + bvec->bv_offset;
|
|
|
|
if (offset >= ordered->file_offset + ordered->len) {
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2008-04-16 09:15:20 -06:00
|
|
|
data = kmap_atomic(bvec->bv_page, KM_USER0);
|
2008-07-17 10:53:50 -06:00
|
|
|
sector_sum->sum = ~(u32)0;
|
|
|
|
sector_sum->sum = btrfs_csum_data(root,
|
|
|
|
data + bvec->bv_offset,
|
|
|
|
sector_sum->sum,
|
|
|
|
bvec->bv_len);
|
2008-04-16 09:15:20 -06:00
|
|
|
kunmap_atomic(data, KM_USER0);
|
2008-07-17 10:53:50 -06:00
|
|
|
btrfs_csum_final(sector_sum->sum,
|
|
|
|
(char *)§or_sum->sum);
|
|
|
|
sector_sum->offset = page_offset(bvec->bv_page) +
|
|
|
|
bvec->bv_offset;
|
2008-07-18 04:17:13 -06:00
|
|
|
|
2008-07-17 10:53:50 -06:00
|
|
|
sector_sum++;
|
2008-04-16 09:15:20 -06:00
|
|
|
bio_index++;
|
2008-07-18 04:17:13 -06:00
|
|
|
total_bytes += bvec->bv_len;
|
|
|
|
this_sum_bytes += bvec->bv_len;
|
2008-04-16 09:15:20 -06:00
|
|
|
bvec++;
|
|
|
|
}
|
2008-07-18 04:17:13 -06:00
|
|
|
btrfs_add_ordered_sum(inode, ordered, sums);
|
|
|
|
btrfs_put_ordered_extent(ordered);
|
|
|
|
if (total_bytes != bio->bi_size) {
|
|
|
|
printk("warning, total bytes %lu bio size %u\n", total_bytes, bio->bi_size);
|
|
|
|
}
|
2008-04-16 09:15:20 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-02-20 10:07:25 -07:00
|
|
|
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root, struct inode *inode,
|
2008-07-17 10:53:50 -06:00
|
|
|
struct btrfs_ordered_sum *sums)
|
2007-03-29 13:15:27 -06:00
|
|
|
{
|
2008-02-20 10:07:25 -07:00
|
|
|
u64 objectid = inode->i_ino;
|
|
|
|
u64 offset;
|
2007-03-29 13:15:27 -06:00
|
|
|
int ret;
|
|
|
|
struct btrfs_key file_key;
|
2007-04-16 07:22:45 -06:00
|
|
|
struct btrfs_key found_key;
|
2008-02-20 10:07:25 -07:00
|
|
|
u64 next_offset;
|
2008-07-17 10:53:50 -06:00
|
|
|
u64 total_bytes = 0;
|
2008-02-20 10:07:25 -07:00
|
|
|
int found_next;
|
2007-04-02 09:20:42 -06:00
|
|
|
struct btrfs_path *path;
|
2007-03-29 13:15:27 -06:00
|
|
|
struct btrfs_csum_item *item;
|
2008-02-20 10:07:25 -07:00
|
|
|
struct btrfs_csum_item *item_end;
|
2007-10-15 14:22:25 -06:00
|
|
|
struct extent_buffer *leaf = NULL;
|
2007-04-16 07:22:45 -06:00
|
|
|
u64 csum_offset;
|
2008-07-17 10:53:50 -06:00
|
|
|
struct btrfs_sector_sum *sector_sum;
|
2007-10-25 13:42:56 -06:00
|
|
|
u32 nritems;
|
|
|
|
u32 ins_size;
|
2008-02-20 10:07:25 -07:00
|
|
|
char *eb_map;
|
|
|
|
char *eb_token;
|
|
|
|
unsigned long map_len;
|
|
|
|
unsigned long map_start;
|
|
|
|
|
2007-04-02 09:20:42 -06:00
|
|
|
path = btrfs_alloc_path();
|
|
|
|
BUG_ON(!path);
|
2008-07-17 10:53:50 -06:00
|
|
|
sector_sum = &sums->sums;
|
2008-02-20 10:07:25 -07:00
|
|
|
again:
|
|
|
|
next_offset = (u64)-1;
|
|
|
|
found_next = 0;
|
2008-07-17 10:53:50 -06:00
|
|
|
offset = sector_sum->offset;
|
2007-03-29 13:15:27 -06:00
|
|
|
file_key.objectid = objectid;
|
|
|
|
file_key.offset = offset;
|
|
|
|
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
|
2007-04-18 14:15:28 -06:00
|
|
|
|
|
|
|
item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1);
|
2007-10-15 14:22:25 -06:00
|
|
|
if (!IS_ERR(item)) {
|
|
|
|
leaf = path->nodes[0];
|
2007-04-18 14:15:28 -06:00
|
|
|
goto found;
|
2007-10-15 14:22:25 -06:00
|
|
|
}
|
2007-04-18 14:15:28 -06:00
|
|
|
ret = PTR_ERR(item);
|
|
|
|
if (ret == -EFBIG) {
|
|
|
|
u32 item_size;
|
|
|
|
/* we found one, but it isn't big enough yet */
|
2007-10-15 14:14:19 -06:00
|
|
|
leaf = path->nodes[0];
|
|
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
2007-05-10 10:36:17 -06:00
|
|
|
if ((item_size / BTRFS_CRC32_SIZE) >= MAX_CSUM_ITEMS(root)) {
|
2007-04-18 14:15:28 -06:00
|
|
|
/* already at max size, make a new one */
|
|
|
|
goto insert;
|
|
|
|
}
|
|
|
|
} else {
|
2007-10-25 13:42:56 -06:00
|
|
|
int slot = path->slots[0] + 1;
|
2007-04-18 14:15:28 -06:00
|
|
|
/* we didn't find a csum item, insert one */
|
2007-10-25 13:42:56 -06:00
|
|
|
nritems = btrfs_header_nritems(path->nodes[0]);
|
|
|
|
if (path->slots[0] >= nritems - 1) {
|
|
|
|
ret = btrfs_next_leaf(root, path);
|
2007-10-29 10:01:05 -06:00
|
|
|
if (ret == 1)
|
2007-10-25 13:42:56 -06:00
|
|
|
found_next = 1;
|
2007-10-29 10:01:05 -06:00
|
|
|
if (ret != 0)
|
2007-10-25 13:42:56 -06:00
|
|
|
goto insert;
|
2007-10-29 10:01:05 -06:00
|
|
|
slot = 0;
|
2007-10-25 13:42:56 -06:00
|
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
|
|
|
|
if (found_key.objectid != objectid ||
|
|
|
|
found_key.type != BTRFS_CSUM_ITEM_KEY) {
|
|
|
|
found_next = 1;
|
|
|
|
goto insert;
|
|
|
|
}
|
|
|
|
next_offset = found_key.offset;
|
|
|
|
found_next = 1;
|
2007-04-18 14:15:28 -06:00
|
|
|
goto insert;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* at this point, we know the tree has an item, but it isn't big
|
|
|
|
* enough yet to put our csum in. Grow it
|
|
|
|
*/
|
|
|
|
btrfs_release_path(root, path);
|
2007-04-16 07:22:45 -06:00
|
|
|
ret = btrfs_search_slot(trans, root, &file_key, path,
|
2007-05-10 10:36:17 -06:00
|
|
|
BTRFS_CRC32_SIZE, 1);
|
2007-04-16 07:22:45 -06:00
|
|
|
if (ret < 0)
|
|
|
|
goto fail;
|
|
|
|
if (ret == 0) {
|
2007-04-17 11:26:50 -06:00
|
|
|
BUG();
|
2007-04-16 07:22:45 -06:00
|
|
|
}
|
|
|
|
if (path->slots[0] == 0) {
|
|
|
|
goto insert;
|
|
|
|
}
|
|
|
|
path->slots[0]--;
|
2007-10-15 14:14:19 -06:00
|
|
|
leaf = path->nodes[0];
|
|
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
2007-04-16 07:22:45 -06:00
|
|
|
csum_offset = (offset - found_key.offset) >>
|
|
|
|
root->fs_info->sb->s_blocksize_bits;
|
|
|
|
if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
|
|
|
|
found_key.objectid != objectid ||
|
|
|
|
csum_offset >= MAX_CSUM_ITEMS(root)) {
|
|
|
|
goto insert;
|
|
|
|
}
|
2007-10-15 14:14:19 -06:00
|
|
|
if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) /
|
2007-05-10 10:36:17 -06:00
|
|
|
BTRFS_CRC32_SIZE) {
|
|
|
|
u32 diff = (csum_offset + 1) * BTRFS_CRC32_SIZE;
|
2007-10-15 14:14:19 -06:00
|
|
|
diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
|
2007-05-24 11:35:57 -06:00
|
|
|
if (diff != BTRFS_CRC32_SIZE)
|
|
|
|
goto insert;
|
2007-04-18 14:15:28 -06:00
|
|
|
ret = btrfs_extend_item(trans, root, path, diff);
|
2007-04-16 07:22:45 -06:00
|
|
|
BUG_ON(ret);
|
|
|
|
goto csum;
|
|
|
|
}
|
|
|
|
|
|
|
|
insert:
|
2007-04-18 14:15:28 -06:00
|
|
|
btrfs_release_path(root, path);
|
2007-04-16 07:22:45 -06:00
|
|
|
csum_offset = 0;
|
2007-10-25 13:42:56 -06:00
|
|
|
if (found_next) {
|
|
|
|
u64 tmp = min((u64)i_size_read(inode), next_offset);
|
2007-10-29 10:01:05 -06:00
|
|
|
tmp -= offset & ~((u64)root->sectorsize -1);
|
2007-10-25 13:42:56 -06:00
|
|
|
tmp >>= root->fs_info->sb->s_blocksize_bits;
|
|
|
|
tmp = max((u64)1, tmp);
|
|
|
|
tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root));
|
|
|
|
ins_size = BTRFS_CRC32_SIZE * tmp;
|
|
|
|
} else {
|
|
|
|
ins_size = BTRFS_CRC32_SIZE;
|
|
|
|
}
|
2007-04-02 09:20:42 -06:00
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
2007-10-25 13:42:56 -06:00
|
|
|
ins_size);
|
2007-06-22 12:16:25 -06:00
|
|
|
if (ret < 0)
|
|
|
|
goto fail;
|
2007-04-18 14:15:28 -06:00
|
|
|
if (ret != 0) {
|
|
|
|
WARN_ON(1);
|
2007-03-29 13:15:27 -06:00
|
|
|
goto fail;
|
2007-04-18 14:15:28 -06:00
|
|
|
}
|
2007-04-16 07:22:45 -06:00
|
|
|
csum:
|
2007-10-15 14:14:19 -06:00
|
|
|
leaf = path->nodes[0];
|
|
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
|
2007-03-29 13:15:27 -06:00
|
|
|
ret = 0;
|
2007-05-10 10:36:17 -06:00
|
|
|
item = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
|
|
csum_offset * BTRFS_CRC32_SIZE);
|
2007-04-17 11:26:50 -06:00
|
|
|
found:
|
2008-02-20 10:07:25 -07:00
|
|
|
item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
|
|
|
|
item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
|
|
|
|
btrfs_item_size_nr(leaf, path->slots[0]));
|
2008-02-20 10:07:25 -07:00
|
|
|
eb_token = NULL;
|
2008-07-17 10:53:50 -06:00
|
|
|
next_sector:
|
2008-01-29 07:10:27 -07:00
|
|
|
|
2008-02-20 10:07:25 -07:00
|
|
|
if (!eb_token ||
|
|
|
|
(unsigned long)item + BTRFS_CRC32_SIZE >= map_start + map_len) {
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if (eb_token)
|
2008-02-21 07:30:08 -07:00
|
|
|
unmap_extent_buffer(leaf, eb_token, KM_USER1);
|
2008-02-20 10:07:25 -07:00
|
|
|
eb_token = NULL;
|
|
|
|
err = map_private_extent_buffer(leaf, (unsigned long)item,
|
|
|
|
BTRFS_CRC32_SIZE,
|
|
|
|
&eb_token, &eb_map,
|
2008-02-21 07:30:08 -07:00
|
|
|
&map_start, &map_len, KM_USER1);
|
2008-02-20 10:07:25 -07:00
|
|
|
if (err)
|
|
|
|
eb_token = NULL;
|
|
|
|
}
|
|
|
|
if (eb_token) {
|
|
|
|
memcpy(eb_token + ((unsigned long)item & (PAGE_CACHE_SIZE - 1)),
|
2008-07-17 10:53:50 -06:00
|
|
|
§or_sum->sum, BTRFS_CRC32_SIZE);
|
2008-02-20 10:07:25 -07:00
|
|
|
} else {
|
2008-07-17 10:53:50 -06:00
|
|
|
write_extent_buffer(leaf, §or_sum->sum,
|
|
|
|
(unsigned long)item, BTRFS_CRC32_SIZE);
|
2008-02-20 10:07:25 -07:00
|
|
|
}
|
2008-07-17 10:53:50 -06:00
|
|
|
total_bytes += root->sectorsize;
|
|
|
|
sector_sum++;
|
|
|
|
if (total_bytes < sums->len) {
|
2008-02-20 10:07:25 -07:00
|
|
|
item = (struct btrfs_csum_item *)((char *)item +
|
|
|
|
BTRFS_CRC32_SIZE);
|
2008-02-20 13:44:32 -07:00
|
|
|
if (item < item_end && offset + PAGE_CACHE_SIZE ==
|
2008-07-17 10:53:50 -06:00
|
|
|
sector_sum->offset) {
|
|
|
|
offset = sector_sum->offset;
|
|
|
|
goto next_sector;
|
2008-02-20 13:44:32 -07:00
|
|
|
}
|
2008-02-20 10:07:25 -07:00
|
|
|
}
|
2008-02-20 10:07:25 -07:00
|
|
|
if (eb_token) {
|
2008-02-21 07:30:08 -07:00
|
|
|
unmap_extent_buffer(leaf, eb_token, KM_USER1);
|
2008-02-20 10:07:25 -07:00
|
|
|
eb_token = NULL;
|
|
|
|
}
|
2007-04-02 09:20:42 -06:00
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
2008-07-17 10:53:50 -06:00
|
|
|
if (total_bytes < sums->len) {
|
2008-02-20 10:07:25 -07:00
|
|
|
btrfs_release_path(root, path);
|
|
|
|
goto again;
|
|
|
|
}
|
2007-03-29 13:15:27 -06:00
|
|
|
fail:
|
2007-04-02 09:20:42 -06:00
|
|
|
btrfs_free_path(path);
|
2007-03-29 13:15:27 -06:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-05-29 13:17:08 -06:00
|
|
|
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root, struct btrfs_path *path,
|
|
|
|
u64 isize)
|
|
|
|
{
|
|
|
|
struct btrfs_key key;
|
2007-10-15 14:14:19 -06:00
|
|
|
struct extent_buffer *leaf = path->nodes[0];
|
2007-05-29 13:17:08 -06:00
|
|
|
int slot = path->slots[0];
|
|
|
|
int ret;
|
|
|
|
u32 new_item_size;
|
|
|
|
u64 new_item_span;
|
|
|
|
u64 blocks;
|
|
|
|
|
2007-10-15 14:14:19 -06:00
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
2007-05-29 13:17:08 -06:00
|
|
|
if (isize <= key.offset)
|
|
|
|
return 0;
|
|
|
|
new_item_span = isize - key.offset;
|
2007-10-15 14:14:19 -06:00
|
|
|
blocks = (new_item_span + root->sectorsize - 1) >>
|
2007-06-12 05:43:08 -06:00
|
|
|
root->fs_info->sb->s_blocksize_bits;
|
2007-05-29 13:17:08 -06:00
|
|
|
new_item_size = blocks * BTRFS_CRC32_SIZE;
|
2007-10-15 14:14:19 -06:00
|
|
|
if (new_item_size >= btrfs_item_size_nr(leaf, slot))
|
2007-05-29 13:17:08 -06:00
|
|
|
return 0;
|
2007-11-01 09:28:41 -06:00
|
|
|
ret = btrfs_truncate_item(trans, root, path, new_item_size, 1);
|
2007-05-29 13:17:08 -06:00
|
|
|
BUG_ON(ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|