xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Btrfs: Create extent_buffer interface for large blocksizes

Browse Source 
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-10-15 16:14:19 -04:00
parent 50b78c24d5
commit 5f39d397df
22 changed files with 2814 additions and 2108 deletions
Download Patch File Download Diff File Expand all files Collapse all files

63
fs/btrfs/file-item.c
View File

@@ -34,12 +34,12 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_file_extent_item *item;
struct btrfs_key file_key;
struct btrfs_path *path;
struct extent_buffer *leaf;
path = btrfs_alloc_path();
BUG_ON(!path);
file_key.objectid = objectid;
file_key.offset = pos;
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
@@ -47,15 +47,16 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
if (ret < 0)
goto out;
BUG_ON(ret);
item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
btrfs_set_file_extent_disk_blocknr(item, offset);
btrfs_set_file_extent_disk_num_blocks(item, disk_num_blocks);
btrfs_set_file_extent_offset(item, 0);
btrfs_set_file_extent_num_blocks(item, num_blocks);
btrfs_set_file_extent_generation(item, trans->transid);
btrfs_set_file_extent_type(item, BTRFS_FILE_EXTENT_REG);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_set_file_extent_disk_blocknr(leaf, item, offset);
btrfs_set_file_extent_disk_num_blocks(leaf, item, disk_num_blocks);
btrfs_set_file_extent_offset(leaf, item, 0);
btrfs_set_file_extent_num_blocks(leaf, item, num_blocks);
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);
out:
btrfs_free_path(path);
return ret;
@@ -71,32 +72,30 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
struct btrfs_key file_key;
struct btrfs_key found_key;
struct btrfs_csum_item *item;
struct btrfs_leaf *leaf;
struct extent_buffer *leaf;
u64 csum_offset = 0;
int csums_in_item;
file_key.objectid = objectid;
file_key.offset = offset;
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
if (ret < 0)
goto fail;
leaf = btrfs_buffer_leaf(path->nodes[0]);
leaf = path->nodes[0];
if (ret > 0) {
ret = 1;
if (path->slots[0] == 0)
goto fail;
path->slots[0]--;
btrfs_disk_key_to_cpu(&found_key,
&leaf->items[path->slots[0]].key);
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) {
goto fail;
}
csum_offset = (offset - found_key.offset) >>
root->fs_info->sb->s_blocksize_bits;
csums_in_item = btrfs_item_size(leaf->items + path->slots[0]);
csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
csums_in_item /= BTRFS_CRC32_SIZE;
if (csum_offset >= csums_in_item) {
@@ -127,7 +126,6 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
file_key.objectid = objectid;
file_key.offset = offset;
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
return ret;
@@ -138,12 +136,14 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
u64 objectid, u64 offset,
char *data, size_t len)
{
return 0;
#if 0
int ret;
struct btrfs_key file_key;
struct btrfs_key found_key;
struct btrfs_path *path;
struct btrfs_csum_item *item;
struct btrfs_leaf *leaf;
struct extent_buffer *leaf;
u64 csum_offset;
path = btrfs_alloc_path();
@@ -161,8 +161,8 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
if (ret == -EFBIG) {
u32 item_size;
/* we found one, but it isn't big enough yet */
leaf = btrfs_buffer_leaf(path->nodes[0]);
item_size = btrfs_item_size(leaf->items + path->slots[0]);
leaf = path->nodes[0];
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
if ((item_size / BTRFS_CRC32_SIZE) >= MAX_CSUM_ITEMS(root)) {
/* already at max size, make a new one */
goto insert;
@@ -188,8 +188,8 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
goto insert;
}
path->slots[0]--;
leaf = btrfs_buffer_leaf(path->nodes[0]);
btrfs_disk_key_to_cpu(&found_key, &leaf->items[path->slots[0]].key);
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
csum_offset = (offset - found_key.offset) >>
root->fs_info->sb->s_blocksize_bits;
if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
@@ -197,10 +197,10 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
csum_offset >= MAX_CSUM_ITEMS(root)) {
goto insert;
}
if (csum_offset >= btrfs_item_size(leaf->items + path->slots[0]) /
if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) /
BTRFS_CRC32_SIZE) {
u32 diff = (csum_offset + 1) * BTRFS_CRC32_SIZE;
diff = diff - btrfs_item_size(leaf->items + path->slots[0]);
diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
if (diff != BTRFS_CRC32_SIZE)
goto insert;
ret = btrfs_extend_item(trans, root, path, diff);
@@ -220,21 +220,20 @@ insert:
goto fail;
}
csum:
item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_csum_item);
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
ret = 0;
item = (struct btrfs_csum_item *)((unsigned char *)item +
csum_offset * BTRFS_CRC32_SIZE);
found:
btrfs_check_bounds(&item->csum, BTRFS_CRC32_SIZE,
path->nodes[0]->b_data,
root->fs_info->sb->s_blocksize);
/* FIXME!!!!!!!!!!!! */
ret = btrfs_csum_data(root, data, len, &item->csum);
btrfs_mark_buffer_dirty(path->nodes[0]);
fail:
btrfs_release_path(root, path);
btrfs_free_path(path);
return ret;
#endif
}
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
@@ -242,21 +241,21 @@ int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
u64 isize)
{
struct btrfs_key key;
struct btrfs_leaf *leaf = btrfs_buffer_leaf(path->nodes[0]);
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_disk_key_to_cpu(&key, &leaf->items[slot].key);
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->blocksize - 1) >>
blocks = (new_item_span + root->sectorsize - 1) >>
root->fs_info->sb->s_blocksize_bits;
new_item_size = blocks * BTRFS_CRC32_SIZE;
if (new_item_size >= btrfs_item_size(leaf->items + slot))
if (new_item_size >= btrfs_item_size_nr(leaf, slot))
return 0;
ret = btrfs_truncate_item(trans, root, path, new_item_size);
BUG_ON(ret);