mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
c1c9ff7c94
u64 is "unsigned long long" on all architectures now, so there's no need to cast it when formatting it using the "ll" length modifier. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
886 lines
24 KiB
C
886 lines
24 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/bio.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/highmem.h>
|
|
#include "ctree.h"
|
|
#include "disk-io.h"
|
|
#include "transaction.h"
|
|
#include "volumes.h"
|
|
#include "print-tree.h"
|
|
|
|
#define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \
|
|
sizeof(struct btrfs_item) * 2) / \
|
|
size) - 1))
|
|
|
|
#define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
|
|
PAGE_CACHE_SIZE))
|
|
|
|
#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
|
|
sizeof(struct btrfs_ordered_sum)) / \
|
|
sizeof(u32) * (r)->sectorsize)
|
|
|
|
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 objectid, u64 pos,
|
|
u64 disk_offset, u64 disk_num_bytes,
|
|
u64 num_bytes, u64 offset, u64 ram_bytes,
|
|
u8 compression, u8 encryption, u16 other_encoding)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_file_extent_item *item;
|
|
struct btrfs_key file_key;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
file_key.objectid = objectid;
|
|
file_key.offset = pos;
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
|
sizeof(*item));
|
|
if (ret < 0)
|
|
goto out;
|
|
BUG_ON(ret); /* Can't happen */
|
|
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, disk_offset);
|
|
btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
|
|
btrfs_set_file_extent_offset(leaf, item, offset);
|
|
btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
|
|
btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
|
|
btrfs_set_file_extent_generation(leaf, item, trans->transid);
|
|
btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
|
|
btrfs_set_file_extent_compression(leaf, item, compression);
|
|
btrfs_set_file_extent_encryption(leaf, item, encryption);
|
|
btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static struct btrfs_csum_item *
|
|
btrfs_lookup_csum(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 bytenr, int cow)
|
|
{
|
|
int ret;
|
|
struct btrfs_key file_key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_csum_item *item;
|
|
struct extent_buffer *leaf;
|
|
u64 csum_offset = 0;
|
|
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
|
|
int csums_in_item;
|
|
|
|
file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
file_key.offset = bytenr;
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
|
|
ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
|
|
if (ret < 0)
|
|
goto fail;
|
|
leaf = path->nodes[0];
|
|
if (ret > 0) {
|
|
ret = 1;
|
|
if (path->slots[0] == 0)
|
|
goto fail;
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
|
|
goto fail;
|
|
|
|
csum_offset = (bytenr - found_key.offset) >>
|
|
root->fs_info->sb->s_blocksize_bits;
|
|
csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
csums_in_item /= csum_size;
|
|
|
|
if (csum_offset == csums_in_item) {
|
|
ret = -EFBIG;
|
|
goto fail;
|
|
} else if (csum_offset > csums_in_item) {
|
|
goto fail;
|
|
}
|
|
}
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
|
|
item = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
csum_offset * csum_size);
|
|
return item;
|
|
fail:
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path, u64 objectid,
|
|
u64 offset, int mod)
|
|
{
|
|
int ret;
|
|
struct btrfs_key file_key;
|
|
int ins_len = mod < 0 ? -1 : 0;
|
|
int cow = mod != 0;
|
|
|
|
file_key.objectid = objectid;
|
|
file_key.offset = offset;
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
|
|
ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_io_bio_endio_readpage(struct btrfs_io_bio *bio, int err)
|
|
{
|
|
kfree(bio->csum_allocated);
|
|
}
|
|
|
|
static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
|
|
struct inode *inode, struct bio *bio,
|
|
u64 logical_offset, u32 *dst, int dio)
|
|
{
|
|
struct bio_vec *bvec = bio->bi_io_vec;
|
|
struct btrfs_io_bio *btrfs_bio = btrfs_io_bio(bio);
|
|
struct btrfs_csum_item *item = NULL;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct btrfs_path *path;
|
|
u8 *csum;
|
|
u64 offset = 0;
|
|
u64 item_start_offset = 0;
|
|
u64 item_last_offset = 0;
|
|
u64 disk_bytenr;
|
|
u32 diff;
|
|
int nblocks;
|
|
int bio_index = 0;
|
|
int count;
|
|
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
nblocks = bio->bi_size >> inode->i_sb->s_blocksize_bits;
|
|
if (!dst) {
|
|
if (nblocks * csum_size > BTRFS_BIO_INLINE_CSUM_SIZE) {
|
|
btrfs_bio->csum_allocated = kmalloc(nblocks * csum_size,
|
|
GFP_NOFS);
|
|
if (!btrfs_bio->csum_allocated) {
|
|
btrfs_free_path(path);
|
|
return -ENOMEM;
|
|
}
|
|
btrfs_bio->csum = btrfs_bio->csum_allocated;
|
|
btrfs_bio->end_io = btrfs_io_bio_endio_readpage;
|
|
} else {
|
|
btrfs_bio->csum = btrfs_bio->csum_inline;
|
|
}
|
|
csum = btrfs_bio->csum;
|
|
} else {
|
|
csum = (u8 *)dst;
|
|
}
|
|
|
|
if (bio->bi_size > PAGE_CACHE_SIZE * 8)
|
|
path->reada = 2;
|
|
|
|
WARN_ON(bio->bi_vcnt <= 0);
|
|
|
|
/*
|
|
* the free space stuff is only read when it hasn't been
|
|
* updated in the current transaction. So, we can safely
|
|
* read from the commit root and sidestep a nasty deadlock
|
|
* between reading the free space cache and updating the csum tree.
|
|
*/
|
|
if (btrfs_is_free_space_inode(inode)) {
|
|
path->search_commit_root = 1;
|
|
path->skip_locking = 1;
|
|
}
|
|
|
|
disk_bytenr = (u64)bio->bi_sector << 9;
|
|
if (dio)
|
|
offset = logical_offset;
|
|
while (bio_index < bio->bi_vcnt) {
|
|
if (!dio)
|
|
offset = page_offset(bvec->bv_page) + bvec->bv_offset;
|
|
count = btrfs_find_ordered_sum(inode, offset, disk_bytenr,
|
|
(u32 *)csum, nblocks);
|
|
if (count)
|
|
goto found;
|
|
|
|
if (!item || disk_bytenr < item_start_offset ||
|
|
disk_bytenr >= item_last_offset) {
|
|
struct btrfs_key found_key;
|
|
u32 item_size;
|
|
|
|
if (item)
|
|
btrfs_release_path(path);
|
|
item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
|
|
path, disk_bytenr, 0);
|
|
if (IS_ERR(item)) {
|
|
count = 1;
|
|
memset(csum, 0, csum_size);
|
|
if (BTRFS_I(inode)->root->root_key.objectid ==
|
|
BTRFS_DATA_RELOC_TREE_OBJECTID) {
|
|
set_extent_bits(io_tree, offset,
|
|
offset + bvec->bv_len - 1,
|
|
EXTENT_NODATASUM, GFP_NOFS);
|
|
} else {
|
|
printk(KERN_INFO "btrfs no csum found "
|
|
"for inode %llu start %llu\n",
|
|
btrfs_ino(inode), offset);
|
|
}
|
|
item = NULL;
|
|
btrfs_release_path(path);
|
|
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 / csum_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 = disk_bytenr - item_start_offset;
|
|
diff = diff / root->sectorsize;
|
|
diff = diff * csum_size;
|
|
count = min_t(int, nblocks, (item_last_offset - disk_bytenr) >>
|
|
inode->i_sb->s_blocksize_bits);
|
|
read_extent_buffer(path->nodes[0], csum,
|
|
((unsigned long)item) + diff,
|
|
csum_size * count);
|
|
found:
|
|
csum += count * csum_size;
|
|
nblocks -= count;
|
|
while (count--) {
|
|
disk_bytenr += bvec->bv_len;
|
|
offset += bvec->bv_len;
|
|
bio_index++;
|
|
bvec++;
|
|
}
|
|
}
|
|
btrfs_free_path(path);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
|
|
struct bio *bio, u32 *dst)
|
|
{
|
|
return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
|
|
}
|
|
|
|
int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
|
|
struct btrfs_dio_private *dip, struct bio *bio,
|
|
u64 offset)
|
|
{
|
|
int len = (bio->bi_sector << 9) - dip->disk_bytenr;
|
|
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
|
|
int ret;
|
|
|
|
len >>= inode->i_sb->s_blocksize_bits;
|
|
len *= csum_size;
|
|
|
|
ret = __btrfs_lookup_bio_sums(root, inode, bio, offset,
|
|
(u32 *)(dip->csum + len), 1);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
|
|
struct list_head *list, int search_commit)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_ordered_sum *sums;
|
|
struct btrfs_csum_item *item;
|
|
LIST_HEAD(tmplist);
|
|
unsigned long offset;
|
|
int ret;
|
|
size_t size;
|
|
u64 csum_end;
|
|
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (search_commit) {
|
|
path->skip_locking = 1;
|
|
path->reada = 2;
|
|
path->search_commit_root = 1;
|
|
}
|
|
|
|
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.offset = start;
|
|
key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0 && path->slots[0] > 0) {
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
|
|
if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
|
|
key.type == BTRFS_EXTENT_CSUM_KEY) {
|
|
offset = (start - key.offset) >>
|
|
root->fs_info->sb->s_blocksize_bits;
|
|
if (offset * csum_size <
|
|
btrfs_item_size_nr(leaf, path->slots[0] - 1))
|
|
path->slots[0]--;
|
|
}
|
|
}
|
|
|
|
while (start <= end) {
|
|
leaf = path->nodes[0];
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0)
|
|
break;
|
|
leaf = path->nodes[0];
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
key.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
key.offset > end)
|
|
break;
|
|
|
|
if (key.offset > start)
|
|
start = key.offset;
|
|
|
|
size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
csum_end = key.offset + (size / csum_size) * root->sectorsize;
|
|
if (csum_end <= start) {
|
|
path->slots[0]++;
|
|
continue;
|
|
}
|
|
|
|
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);
|
|
if (!sums) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
sums->bytenr = start;
|
|
sums->len = (int)size;
|
|
|
|
offset = (start - key.offset) >>
|
|
root->fs_info->sb->s_blocksize_bits;
|
|
offset *= csum_size;
|
|
size >>= root->fs_info->sb->s_blocksize_bits;
|
|
|
|
read_extent_buffer(path->nodes[0],
|
|
sums->sums,
|
|
((unsigned long)item) + offset,
|
|
csum_size * size);
|
|
|
|
start += root->sectorsize * size;
|
|
list_add_tail(&sums->list, &tmplist);
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
ret = 0;
|
|
fail:
|
|
while (ret < 0 && !list_empty(&tmplist)) {
|
|
sums = list_entry(&tmplist, struct btrfs_ordered_sum, list);
|
|
list_del(&sums->list);
|
|
kfree(sums);
|
|
}
|
|
list_splice_tail(&tmplist, list);
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
|
|
struct bio *bio, u64 file_start, int contig)
|
|
{
|
|
struct btrfs_ordered_sum *sums;
|
|
struct btrfs_ordered_extent *ordered;
|
|
char *data;
|
|
struct bio_vec *bvec = bio->bi_io_vec;
|
|
int bio_index = 0;
|
|
int index;
|
|
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;
|
|
|
|
sums->len = bio->bi_size;
|
|
INIT_LIST_HEAD(&sums->list);
|
|
|
|
if (contig)
|
|
offset = file_start;
|
|
else
|
|
offset = page_offset(bvec->bv_page) + bvec->bv_offset;
|
|
|
|
ordered = btrfs_lookup_ordered_extent(inode, offset);
|
|
BUG_ON(!ordered); /* Logic error */
|
|
sums->bytenr = (u64)bio->bi_sector << 9;
|
|
index = 0;
|
|
|
|
while (bio_index < bio->bi_vcnt) {
|
|
if (!contig)
|
|
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); /* -ENOMEM */
|
|
sums->len = bytes_left;
|
|
ordered = btrfs_lookup_ordered_extent(inode, offset);
|
|
BUG_ON(!ordered); /* Logic error */
|
|
sums->bytenr = ((u64)bio->bi_sector << 9) +
|
|
total_bytes;
|
|
index = 0;
|
|
}
|
|
|
|
data = kmap_atomic(bvec->bv_page);
|
|
sums->sums[index] = ~(u32)0;
|
|
sums->sums[index] = btrfs_csum_data(data + bvec->bv_offset,
|
|
sums->sums[index],
|
|
bvec->bv_len);
|
|
kunmap_atomic(data);
|
|
btrfs_csum_final(sums->sums[index],
|
|
(char *)(sums->sums + index));
|
|
|
|
bio_index++;
|
|
index++;
|
|
total_bytes += bvec->bv_len;
|
|
this_sum_bytes += bvec->bv_len;
|
|
offset += bvec->bv_len;
|
|
bvec++;
|
|
}
|
|
this_sum_bytes = 0;
|
|
btrfs_add_ordered_sum(inode, ordered, sums);
|
|
btrfs_put_ordered_extent(ordered);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* helper function for csum removal, this expects the
|
|
* key to describe the csum pointed to by the path, and it expects
|
|
* the csum to overlap the range [bytenr, len]
|
|
*
|
|
* The csum should not be entirely contained in the range and the
|
|
* range should not be entirely contained in the csum.
|
|
*
|
|
* This calls btrfs_truncate_item with the correct args based on the
|
|
* overlap, and fixes up the key as required.
|
|
*/
|
|
static noinline void truncate_one_csum(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key,
|
|
u64 bytenr, u64 len)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
|
|
u64 csum_end;
|
|
u64 end_byte = bytenr + len;
|
|
u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
|
|
|
|
leaf = path->nodes[0];
|
|
csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
|
|
csum_end <<= root->fs_info->sb->s_blocksize_bits;
|
|
csum_end += key->offset;
|
|
|
|
if (key->offset < bytenr && csum_end <= end_byte) {
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [ ]
|
|
* [csum ]
|
|
* A simple truncate off the end of the item
|
|
*/
|
|
u32 new_size = (bytenr - key->offset) >> blocksize_bits;
|
|
new_size *= csum_size;
|
|
btrfs_truncate_item(root, path, new_size, 1);
|
|
} else if (key->offset >= bytenr && csum_end > end_byte &&
|
|
end_byte > key->offset) {
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [ ]
|
|
* [csum ]
|
|
* we need to truncate from the beginning of the csum
|
|
*/
|
|
u32 new_size = (csum_end - end_byte) >> blocksize_bits;
|
|
new_size *= csum_size;
|
|
|
|
btrfs_truncate_item(root, path, new_size, 0);
|
|
|
|
key->offset = end_byte;
|
|
btrfs_set_item_key_safe(root, path, key);
|
|
} else {
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* deletes the csum items from the csum tree for a given
|
|
* range of bytes.
|
|
*/
|
|
int btrfs_del_csums(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 bytenr, u64 len)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
u64 end_byte = bytenr + len;
|
|
u64 csum_end;
|
|
struct extent_buffer *leaf;
|
|
int ret;
|
|
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
|
|
int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
|
|
|
|
root = root->fs_info->csum_root;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
while (1) {
|
|
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.offset = end_byte - 1;
|
|
key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
} else if (ret < 0) {
|
|
break;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
|
|
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
key.type != BTRFS_EXTENT_CSUM_KEY) {
|
|
break;
|
|
}
|
|
|
|
if (key.offset >= end_byte)
|
|
break;
|
|
|
|
csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
|
|
csum_end <<= blocksize_bits;
|
|
csum_end += key.offset;
|
|
|
|
/* this csum ends before we start, we're done */
|
|
if (csum_end <= bytenr)
|
|
break;
|
|
|
|
/* delete the entire item, it is inside our range */
|
|
if (key.offset >= bytenr && csum_end <= end_byte) {
|
|
ret = btrfs_del_item(trans, root, path);
|
|
if (ret)
|
|
goto out;
|
|
if (key.offset == bytenr)
|
|
break;
|
|
} else if (key.offset < bytenr && csum_end > end_byte) {
|
|
unsigned long offset;
|
|
unsigned long shift_len;
|
|
unsigned long item_offset;
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [csum ]
|
|
*
|
|
* Our bytes are in the middle of the csum,
|
|
* we need to split this item and insert a new one.
|
|
*
|
|
* But we can't drop the path because the
|
|
* csum could change, get removed, extended etc.
|
|
*
|
|
* The trick here is the max size of a csum item leaves
|
|
* enough room in the tree block for a single
|
|
* item header. So, we split the item in place,
|
|
* adding a new header pointing to the existing
|
|
* bytes. Then we loop around again and we have
|
|
* a nicely formed csum item that we can neatly
|
|
* truncate.
|
|
*/
|
|
offset = (bytenr - key.offset) >> blocksize_bits;
|
|
offset *= csum_size;
|
|
|
|
shift_len = (len >> blocksize_bits) * csum_size;
|
|
|
|
item_offset = btrfs_item_ptr_offset(leaf,
|
|
path->slots[0]);
|
|
|
|
memset_extent_buffer(leaf, 0, item_offset + offset,
|
|
shift_len);
|
|
key.offset = bytenr;
|
|
|
|
/*
|
|
* btrfs_split_item returns -EAGAIN when the
|
|
* item changed size or key
|
|
*/
|
|
ret = btrfs_split_item(trans, root, path, &key, offset);
|
|
if (ret && ret != -EAGAIN) {
|
|
btrfs_abort_transaction(trans, root, ret);
|
|
goto out;
|
|
}
|
|
|
|
key.offset = end_byte - 1;
|
|
} else {
|
|
truncate_one_csum(root, path, &key, bytenr, len);
|
|
if (key.offset < bytenr)
|
|
break;
|
|
}
|
|
btrfs_release_path(path);
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_ordered_sum *sums)
|
|
{
|
|
struct btrfs_key file_key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *path;
|
|
struct btrfs_csum_item *item;
|
|
struct btrfs_csum_item *item_end;
|
|
struct extent_buffer *leaf = NULL;
|
|
u64 next_offset;
|
|
u64 total_bytes = 0;
|
|
u64 csum_offset;
|
|
u64 bytenr;
|
|
u32 nritems;
|
|
u32 ins_size;
|
|
int index = 0;
|
|
int found_next;
|
|
int ret;
|
|
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
again:
|
|
next_offset = (u64)-1;
|
|
found_next = 0;
|
|
bytenr = sums->bytenr + total_bytes;
|
|
file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
file_key.offset = bytenr;
|
|
btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
|
|
|
|
item = btrfs_lookup_csum(trans, root, path, bytenr, 1);
|
|
if (!IS_ERR(item)) {
|
|
ret = 0;
|
|
leaf = path->nodes[0];
|
|
item_end = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_csum_item);
|
|
item_end = (struct btrfs_csum_item *)((char *)item_end +
|
|
btrfs_item_size_nr(leaf, path->slots[0]));
|
|
goto found;
|
|
}
|
|
ret = PTR_ERR(item);
|
|
if (ret != -EFBIG && ret != -ENOENT)
|
|
goto fail_unlock;
|
|
|
|
if (ret == -EFBIG) {
|
|
u32 item_size;
|
|
/* we found one, but it isn't big enough yet */
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
if ((item_size / csum_size) >=
|
|
MAX_CSUM_ITEMS(root, csum_size)) {
|
|
/* already at max size, make a new one */
|
|
goto insert;
|
|
}
|
|
} else {
|
|
int slot = path->slots[0] + 1;
|
|
/* we didn't find a csum item, insert one */
|
|
nritems = btrfs_header_nritems(path->nodes[0]);
|
|
if (path->slots[0] >= nritems - 1) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret == 1)
|
|
found_next = 1;
|
|
if (ret != 0)
|
|
goto insert;
|
|
slot = 0;
|
|
}
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
|
|
if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
found_key.type != BTRFS_EXTENT_CSUM_KEY) {
|
|
found_next = 1;
|
|
goto insert;
|
|
}
|
|
next_offset = found_key.offset;
|
|
found_next = 1;
|
|
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(path);
|
|
ret = btrfs_search_slot(trans, root, &file_key, path,
|
|
csum_size, 1);
|
|
if (ret < 0)
|
|
goto fail_unlock;
|
|
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
goto insert;
|
|
path->slots[0]--;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
csum_offset = (bytenr - found_key.offset) >>
|
|
root->fs_info->sb->s_blocksize_bits;
|
|
|
|
if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
|
|
found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
|
|
goto insert;
|
|
}
|
|
|
|
if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
|
|
csum_size) {
|
|
int extend_nr;
|
|
u64 tmp;
|
|
u32 diff;
|
|
u32 free_space;
|
|
|
|
if (btrfs_leaf_free_space(root, leaf) <
|
|
sizeof(struct btrfs_item) + csum_size * 2)
|
|
goto insert;
|
|
|
|
free_space = btrfs_leaf_free_space(root, leaf) -
|
|
sizeof(struct btrfs_item) - csum_size;
|
|
tmp = sums->len - total_bytes;
|
|
tmp >>= root->fs_info->sb->s_blocksize_bits;
|
|
WARN_ON(tmp < 1);
|
|
|
|
extend_nr = max_t(int, 1, (int)tmp);
|
|
diff = (csum_offset + extend_nr) * csum_size;
|
|
diff = min(diff, MAX_CSUM_ITEMS(root, csum_size) * csum_size);
|
|
|
|
diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
|
|
diff = min(free_space, diff);
|
|
diff /= csum_size;
|
|
diff *= csum_size;
|
|
|
|
btrfs_extend_item(root, path, diff);
|
|
ret = 0;
|
|
goto csum;
|
|
}
|
|
|
|
insert:
|
|
btrfs_release_path(path);
|
|
csum_offset = 0;
|
|
if (found_next) {
|
|
u64 tmp;
|
|
|
|
tmp = sums->len - total_bytes;
|
|
tmp >>= root->fs_info->sb->s_blocksize_bits;
|
|
tmp = min(tmp, (next_offset - file_key.offset) >>
|
|
root->fs_info->sb->s_blocksize_bits);
|
|
|
|
tmp = max((u64)1, tmp);
|
|
tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
|
|
ins_size = csum_size * tmp;
|
|
} else {
|
|
ins_size = csum_size;
|
|
}
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
|
ins_size);
|
|
path->leave_spinning = 0;
|
|
if (ret < 0)
|
|
goto fail_unlock;
|
|
if (ret != 0) {
|
|
WARN_ON(1);
|
|
goto fail_unlock;
|
|
}
|
|
leaf = path->nodes[0];
|
|
csum:
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
|
|
item_end = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
btrfs_item_size_nr(leaf, path->slots[0]));
|
|
item = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
csum_offset * csum_size);
|
|
found:
|
|
ins_size = (u32)(sums->len - total_bytes) >>
|
|
root->fs_info->sb->s_blocksize_bits;
|
|
ins_size *= csum_size;
|
|
ins_size = min_t(u32, (unsigned long)item_end - (unsigned long)item,
|
|
ins_size);
|
|
write_extent_buffer(leaf, sums->sums + index, (unsigned long)item,
|
|
ins_size);
|
|
|
|
ins_size /= csum_size;
|
|
total_bytes += ins_size * root->sectorsize;
|
|
index += ins_size;
|
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
if (total_bytes < sums->len) {
|
|
btrfs_release_path(path);
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
|
|
fail_unlock:
|
|
goto out;
|
|
}
|