*/
#include <linux/bio.h>
+#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include "ctree.h"
#include "transaction.h"
#include "print-tree.h"
-#define MAX_CSUM_ITEMS(r,size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
+#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,
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)
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)
+ u64 bytenr, int cow)
{
int ret;
struct btrfs_key file_key;
btrfs_super_csum_size(&root->fs_info->super_copy);
int csums_in_item;
- file_key.objectid = objectid;
- file_key.offset = offset;
- btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
+ 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;
goto fail;
path->slots[0]--;
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
- found_key.objectid != objectid) {
+ if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
goto fail;
- }
- csum_offset = (offset - found_key.offset) >>
+
+ 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;
return ret;
}
-int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
- struct bio *bio)
+
+static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
+ struct inode *inode, struct bio *bio,
+ u64 logical_offset, u32 *dst, int dio)
{
u32 sum;
struct bio_vec *bvec = bio->bi_io_vec;
int bio_index = 0;
- u64 offset;
+ u64 offset = 0;
u64 item_start_offset = 0;
u64 item_last_offset = 0;
+ u64 disk_bytenr;
u32 diff;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
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);
+ 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;
+ ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum);
if (ret == 0)
goto found;
- if (!item || offset < item_start_offset ||
- offset >= item_last_offset) {
+ 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(root, path);
- item = btrfs_lookup_csum(NULL, root, path,
- inode->i_ino, offset, 0);
+ item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
+ path, disk_bytenr, 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);
+ 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 %lu start %llu\n",
+ inode->i_ino,
+ (unsigned long long)offset);
+ }
item = NULL;
btrfs_release_path(root, path);
goto found;
* 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 = disk_bytenr - item_start_offset;
diff = diff / root->sectorsize;
diff = diff * csum_size;
((unsigned long)item) + diff,
csum_size);
found:
- set_state_private(io_tree, offset, sum);
+ if (dst)
+ *dst++ = sum;
+ else
+ set_state_private(io_tree, offset, sum);
+ disk_bytenr += bvec->bv_len;
+ offset += bvec->bv_len;
bio_index++;
bvec++;
}
return 0;
}
-int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
- u64 start, unsigned long len)
+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 bio *bio, u64 offset, u32 *dst)
+{
+ return __btrfs_lookup_bio_sums(root, inode, bio, offset, dst, 1);
+}
+
+int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
+ struct list_head *list)
{
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
struct btrfs_ordered_sum *sums;
struct btrfs_sector_sum *sector_sum;
- struct btrfs_ordered_extent *ordered;
- char *data;
- struct page *page;
- unsigned long total_bytes = 0;
- unsigned long this_sum_bytes = 0;
+ struct btrfs_csum_item *item;
+ unsigned long offset;
+ int ret;
+ size_t size;
+ u64 csum_end;
+ u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);
- sums = kzalloc(btrfs_ordered_sum_size(root, len), GFP_NOFS);
- if (!sums)
- return -ENOMEM;
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
- sector_sum = sums->sums;
- sums->file_offset = start;
- sums->len = len;
- INIT_LIST_HEAD(&sums->list);
- ordered = btrfs_lookup_ordered_extent(inode, sums->file_offset);
- BUG_ON(!ordered);
+ key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
+ key.offset = start;
+ key.type = BTRFS_EXTENT_CSUM_KEY;
- while(len > 0) {
- if (start >= ordered->file_offset + ordered->len ||
- start < ordered->file_offset) {
- sums->len = this_sum_bytes;
- this_sum_bytes = 0;
- btrfs_add_ordered_sum(inode, ordered, sums);
- btrfs_put_ordered_extent(ordered);
+ 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]--;
+ }
+ }
- sums = kzalloc(btrfs_ordered_sum_size(root, len),
- GFP_NOFS);
- BUG_ON(!sums);
- sector_sum = sums->sums;
- sums->len = len;
- sums->file_offset = start;
- ordered = btrfs_lookup_ordered_extent(inode,
- sums->file_offset);
- BUG_ON(!ordered);
+ 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];
}
- page = find_get_page(inode->i_mapping,
- start >> PAGE_CACHE_SHIFT);
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
+ key.type != BTRFS_EXTENT_CSUM_KEY)
+ break;
- data = kmap_atomic(page, KM_USER0);
- sector_sum->sum = ~(u32)0;
- sector_sum->sum = btrfs_csum_data(root, data, sector_sum->sum,
- PAGE_CACHE_SIZE);
- kunmap_atomic(data, KM_USER0);
- btrfs_csum_final(sector_sum->sum,
- (char *)§or_sum->sum);
- sector_sum->offset = page_offset(page);
- page_cache_release(page);
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.offset > end)
+ break;
- sector_sum++;
- total_bytes += PAGE_CACHE_SIZE;
- this_sum_bytes += PAGE_CACHE_SIZE;
- start += PAGE_CACHE_SIZE;
+ 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;
+ }
- WARN_ON(len < PAGE_CACHE_SIZE);
- len -= PAGE_CACHE_SIZE;
+ 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;
+
+ offset = (start - key.offset) >>
+ root->fs_info->sb->s_blocksize_bits;
+ offset *= csum_size;
+
+ 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);
+ }
+ path->slots[0]++;
}
- btrfs_add_ordered_sum(inode, ordered, sums);
- btrfs_put_ordered_extent(ordered);
- return 0;
+ ret = 0;
+fail:
+ btrfs_free_path(path);
+ return ret;
}
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
- struct bio *bio)
+ struct bio *bio, u64 file_start, int contig)
{
struct btrfs_ordered_sum *sums;
struct btrfs_sector_sum *sector_sum;
unsigned long total_bytes = 0;
unsigned long this_sum_bytes = 0;
u64 offset;
+ u64 disk_bytenr;
WARN_ON(bio->bi_vcnt <= 0);
sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
return -ENOMEM;
sector_sum = sums->sums;
- sums->file_offset = page_offset(bvec->bv_page) + bvec->bv_offset;
+ disk_bytenr = (u64)bio->bi_sector << 9;
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) {
+ if (contig)
+ offset = file_start;
+ else
offset = page_offset(bvec->bv_page) + bvec->bv_offset;
- if (offset >= ordered->file_offset + ordered->len ||
- offset < ordered->file_offset) {
+
+ ordered = btrfs_lookup_ordered_extent(inode, offset);
+ BUG_ON(!ordered);
+ sums->bytenr = ordered->start;
+
+ while (bio_index < bio->bi_vcnt) {
+ if (!contig)
+ offset = page_offset(bvec->bv_page) + bvec->bv_offset;
+
+ if (!contig && (offset >= ordered->file_offset + ordered->len ||
+ offset < ordered->file_offset)) {
unsigned long bytes_left;
sums->len = this_sum_bytes;
this_sum_bytes = 0;
BUG_ON(!sums);
sector_sum = sums->sums;
sums->len = bytes_left;
- sums->file_offset = offset;
- ordered = btrfs_lookup_ordered_extent(inode,
- sums->file_offset);
+ ordered = btrfs_lookup_ordered_extent(inode, offset);
BUG_ON(!ordered);
+ sums->bytenr = ordered->start;
}
data = kmap_atomic(bvec->bv_page, KM_USER0);
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->bytenr = disk_bytenr;
sector_sum++;
bio_index++;
total_bytes += bvec->bv_len;
this_sum_bytes += bvec->bv_len;
+ disk_bytenr += bvec->bv_len;
+ offset += bvec->bv_len;
bvec++;
}
this_sum_bytes = 0;
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 int truncate_one_csum(struct btrfs_trans_handle *trans,
+ 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;
+ int ret;
+
+ 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;
+ ret = btrfs_truncate_item(trans, root, path, new_size, 1);
+ BUG_ON(ret);
+ } 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;
+
+ ret = btrfs_truncate_item(trans, root, path, new_size, 0);
+ BUG_ON(ret);
+
+ key->offset = end_byte;
+ ret = btrfs_set_item_key_safe(trans, root, path, key);
+ BUG_ON(ret);
+ } else {
+ BUG();
+ }
+ return 0;
+}
+
+/*
+ * 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();
+
+ 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)
+ goto out;
+ path->slots[0]--;
+ }
+ 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);
+ BUG_ON(ret);
+ 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);
+ BUG_ON(ret && ret != -EAGAIN);
+
+ key.offset = end_byte - 1;
+ } else {
+ ret = truncate_one_csum(trans, root, path,
+ &key, bytenr, len);
+ BUG_ON(ret);
+ if (key.offset < bytenr)
+ break;
+ }
+ btrfs_release_path(root, path);
+ }
+out:
+ btrfs_free_path(path);
+ return 0;
+}
+
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode,
+ struct btrfs_root *root,
struct btrfs_ordered_sum *sums)
{
- u64 objectid = inode->i_ino;
- u64 offset;
+ u64 bytenr;
int ret;
struct btrfs_key file_key;
struct btrfs_key found_key;
again:
next_offset = (u64)-1;
found_next = 0;
- offset = sector_sum->offset;
- file_key.objectid = objectid;
- file_key.offset = offset;
- btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
+ file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
+ file_key.offset = sector_sum->bytenr;
+ bytenr = sector_sum->bytenr;
+ btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
- mutex_lock(&BTRFS_I(inode)->csum_mutex);
- item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1);
+ item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
if (!IS_ERR(item)) {
leaf = path->nodes[0];
ret = 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 */
slot = 0;
}
btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
- if (found_key.objectid != objectid ||
- found_key.type != BTRFS_CSUM_ITEM_KEY) {
+ if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
+ found_key.type != BTRFS_EXTENT_CSUM_KEY) {
found_next = 1;
goto insert;
}
csum_size, 1);
if (ret < 0)
goto fail_unlock;
- if (ret == 0) {
- BUG();
- }
- if (path->slots[0] == 0) {
- goto insert;
+
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ goto insert;
+ path->slots[0]--;
}
- path->slots[0]--;
+
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- csum_offset = (offset - found_key.offset) >>
+ csum_offset = (bytenr - found_key.offset) >>
root->fs_info->sb->s_blocksize_bits;
- if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
- found_key.objectid != objectid ||
+
+ 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) {
u32 diff = (csum_offset + 1) * csum_size;
+
+ /*
+ * is the item big enough already? we dropped our lock
+ * before and need to recheck
+ */
+ if (diff < btrfs_item_size_nr(leaf, path->slots[0]))
+ goto csum;
+
diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
if (diff != csum_size)
goto insert;
+
ret = btrfs_extend_item(trans, root, path, diff);
BUG_ON(ret);
goto csum;
btrfs_release_path(root, path);
csum_offset = 0;
if (found_next) {
- u64 tmp = min((u64)i_size_read(inode), next_offset);
- tmp -= offset & ~((u64)root->sectorsize -1);
+ u64 tmp = total_bytes + root->sectorsize;
+ u64 next_sector = sector_sum->bytenr;
+ struct btrfs_sector_sum *next = sector_sum + 1;
+
+ while (tmp < sums->len) {
+ if (next_sector + root->sectorsize != next->bytenr)
+ break;
+ tmp += root->sectorsize;
+ next_sector = next->bytenr;
+ next++;
+ }
+ tmp = min(tmp, next_offset - file_key.offset);
tmp >>= root->fs_info->sb->s_blocksize_bits;
tmp = max((u64)1, tmp);
tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
} 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) {
item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
btrfs_item_size_nr(leaf, path->slots[0]));
eb_token = NULL;
- mutex_unlock(&BTRFS_I(inode)->csum_mutex);
- cond_resched();
next_sector:
if (!eb_token ||
if (total_bytes < sums->len) {
item = (struct btrfs_csum_item *)((char *)item +
csum_size);
- if (item < item_end && offset + PAGE_CACHE_SIZE ==
- sector_sum->offset) {
- offset = sector_sum->offset;
+ if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
+ sector_sum->bytenr) {
+ bytenr = sector_sum->bytenr;
goto next_sector;
}
}
eb_token = NULL;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
- cond_resched();
if (total_bytes < sums->len) {
btrfs_release_path(root, path);
+ cond_resched();
goto again;
}
out:
return ret;
fail_unlock:
- mutex_unlock(&BTRFS_I(inode)->csum_mutex);
goto out;
}
-
-int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct btrfs_path *path,
- u64 isize)
-{
- struct btrfs_key key;
- struct extent_buffer *leaf = path->nodes[0];
- int slot = path->slots[0];
- int ret;
- u32 new_item_size;
- u64 new_item_span;
- u64 blocks;
-
- btrfs_item_key_to_cpu(leaf, &key, slot);
- if (isize <= key.offset)
- return 0;
- new_item_span = isize - key.offset;
- blocks = (new_item_span + root->sectorsize - 1) >>
- root->fs_info->sb->s_blocksize_bits;
- new_item_size = blocks *
- btrfs_super_csum_size(&root->fs_info->super_copy);
- if (new_item_size >= btrfs_item_size_nr(leaf, slot))
- return 0;
- ret = btrfs_truncate_item(trans, root, path, new_item_size, 1);
- BUG_ON(ret);
- return ret;
-}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff