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Btrfs: progress on file_write
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Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Chris Mason authored and David Woodhouse committed Apr 17, 2007
1 parent 6567e83 commit b18c668
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Showing 5 changed files with 394 additions and 49 deletions.
57 changes: 57 additions & 0 deletions fs/btrfs/ctree.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1249,6 +1249,63 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
return ret;
}

int btrfs_truncate_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u32 new_size)
{
int ret = 0;
int slot;
int slot_orig;
struct btrfs_leaf *leaf;
struct buffer_head *leaf_buf;
u32 nritems;
unsigned int data_end;
unsigned int old_data_start;
unsigned int old_size;
unsigned int size_diff;
int i;

slot_orig = path->slots[0];
leaf_buf = path->nodes[0];
leaf = btrfs_buffer_leaf(leaf_buf);

nritems = btrfs_header_nritems(&leaf->header);
data_end = leaf_data_end(root, leaf);

slot = path->slots[0];
old_data_start = btrfs_item_offset(leaf->items + slot);
old_size = btrfs_item_size(leaf->items + slot);
BUG_ON(old_size <= new_size);
size_diff = old_size - new_size;

BUG_ON(slot < 0);
BUG_ON(slot >= nritems);

/*
* item0..itemN ... dataN.offset..dataN.size .. data0.size
*/
/* first correct the data pointers */
for (i = slot; i < nritems; i++) {
u32 ioff = btrfs_item_offset(leaf->items + i);
btrfs_set_item_offset(leaf->items + i,
ioff + size_diff);
}
/* shift the data */
printk("truncate item, new_size %u old_size %u, diff %u, bufp %p, dst, %p, num %u, old_data_start %u, data_end %u\n", new_size, old_size, size_diff, leaf, btrfs_leaf_data(leaf) + data_end + size_diff, old_data_start-data_end, old_data_start, data_end);
btrfs_memmove(root, leaf, btrfs_leaf_data(leaf) +
data_end + size_diff, btrfs_leaf_data(leaf) +
data_end, old_data_start + new_size - data_end);
btrfs_set_item_size(leaf->items + slot, new_size);
btrfs_mark_buffer_dirty(leaf_buf);

ret = 0;
if (btrfs_leaf_free_space(root, leaf) < 0)
BUG();
check_leaf(root, path, 0);
return ret;
}

int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, u32 data_size)
{
Expand Down
21 changes: 16 additions & 5 deletions fs/btrfs/ctree.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -999,7 +999,7 @@ static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
((type *)(btrfs_leaf_data(leaf) + \
btrfs_item_offset((leaf)->items + (slot))))

/* extent-item.c */
/* extent-tree.c */
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
Expand All @@ -1013,9 +1013,16 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 blocknr, u64 num_blocks, int pin);
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
btrfs_root *root);
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 blocknr, u64 num_blocks);
/* ctree.c */
int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, u32 data_size);
int btrfs_truncate_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u32 new_size);
int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_path *p, int
ins_len, int cow);
Expand Down Expand Up @@ -1073,11 +1080,10 @@ int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
struct btrfs_key *location, int mod);

/* file-item.c */
int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 offset,
u64 num_blocks, u64 hint_block,
u64 *result);
u64 objectid, u64 pos, u64 offset,
u64 num_blocks);
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 objectid,
Expand All @@ -1090,6 +1096,11 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
int btrfs_csum_verify_file_block(struct btrfs_root *root,
u64 objectid, u64 offset,
char *data, size_t len);
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);
/* super.c */
extern struct subsystem btrfs_subsys;

Expand Down
20 changes: 11 additions & 9 deletions fs/btrfs/extent-tree.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -12,8 +12,9 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);

static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 blocknr, u64 num_blocks)
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 blocknr, u64 num_blocks)
{
struct btrfs_path *path;
int ret;
Expand Down Expand Up @@ -50,8 +51,9 @@ static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
return 0;
}

static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 blocknr, u64 num_blocks, u32 *refs)
static int lookup_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 blocknr,
u64 num_blocks, u32 *refs)
{
struct btrfs_path *path;
int ret;
Expand Down Expand Up @@ -80,7 +82,7 @@ static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
return inc_block_ref(trans, root, bh_blocknr(root->node), 1);
return btrfs_inc_extent_ref(trans, root, bh_blocknr(root->node), 1);
}

int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
Expand All @@ -107,13 +109,13 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
continue;
fi = btrfs_item_ptr(buf_leaf, i,
struct btrfs_file_extent_item);
ret = inc_block_ref(trans, root,
ret = btrfs_inc_extent_ref(trans, root,
btrfs_file_extent_disk_blocknr(fi),
btrfs_file_extent_disk_num_blocks(fi));
BUG_ON(ret);
} else {
blocknr = btrfs_node_blockptr(buf_node, i);
ret = inc_block_ref(trans, root, blocknr, 1);
ret = btrfs_inc_extent_ref(trans, root, blocknr, 1);
BUG_ON(ret);
}
}
Expand Down Expand Up @@ -563,7 +565,7 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root

WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
ret = lookup_block_ref(trans, root, bh_blocknr(path->nodes[*level]),
ret = lookup_extent_ref(trans, root, bh_blocknr(path->nodes[*level]),
1, &refs);
BUG_ON(ret);
if (refs > 1)
Expand All @@ -587,7 +589,7 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
}
blocknr = btrfs_node_blockptr(btrfs_buffer_node(cur),
path->slots[*level]);
ret = lookup_block_ref(trans, root, blocknr, 1, &refs);
ret = lookup_extent_ref(trans, root, blocknr, 1, &refs);
BUG_ON(ret);
if (refs != 1) {
path->slots[*level]++;
Expand Down
61 changes: 41 additions & 20 deletions fs/btrfs/file-item.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -6,13 +6,11 @@
#define MAX_CSUM_ITEMS(r) ((((BTRFS_LEAF_DATA_SIZE(r) - \
sizeof(struct btrfs_item)) / \
sizeof(struct btrfs_csum_item)) - 1))
int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 offset,
u64 num_blocks, u64 hint_block,
u64 *result)
u64 objectid, u64 pos,
u64 offset, u64 num_blocks)
{
struct btrfs_key ins;
int ret = 0;
struct btrfs_file_extent_item *item;
struct btrfs_key file_key;
Expand All @@ -21,11 +19,13 @@ int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
/*
ret = btrfs_alloc_extent(trans, root, num_blocks, hint_block,
(u64)-1, &ins);
*/
BUG_ON(ret);
file_key.objectid = objectid;
file_key.offset = offset;
file_key.offset = pos;
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);

Expand All @@ -34,21 +34,22 @@ int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
BUG_ON(ret);
item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_file_extent_item);
btrfs_set_file_extent_disk_blocknr(item, ins.objectid);
btrfs_set_file_extent_disk_num_blocks(item, ins.offset);
btrfs_set_file_extent_disk_blocknr(item, offset);
btrfs_set_file_extent_disk_num_blocks(item, num_blocks);
btrfs_set_file_extent_offset(item, 0);
btrfs_set_file_extent_num_blocks(item, ins.offset);
btrfs_set_file_extent_num_blocks(item, num_blocks);
btrfs_set_file_extent_generation(item, trans->transid);
btrfs_mark_buffer_dirty(path->nodes[0]);
*result = ins.objectid;
btrfs_release_path(root, path);
btrfs_free_path(path);
return 0;
}

static struct btrfs_csum_item *__lookup_csum_item(struct btrfs_root *root,
struct btrfs_path *path,
u64 objectid, u64 offset)
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)
{
int ret;
struct btrfs_key file_key;
Expand All @@ -61,26 +62,31 @@ static struct btrfs_csum_item *__lookup_csum_item(struct btrfs_root *root,
file_key.offset = offset;
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
ret = btrfs_search_slot(NULL, root, &file_key, path, 0, 0);
printk("__lookup for %Lu\n", offset);
ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
if (ret < 0)
goto fail;
leaf = btrfs_buffer_leaf(path->nodes[0]);
if (ret > 0) {
ret = 1;
if (path->slots[0] == 0)
if (path->slots[0] == 0) {
printk("fail1\n");
goto fail;
}
path->slots[0]--;
btrfs_disk_key_to_cpu(&found_key,
&leaf->items[path->slots[0]].key);
if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
found_key.objectid != objectid) {
printk("fail2 type %u %Lu %Lu\n", btrfs_key_type(&found_key), found_key.objectid, objectid);
goto fail;
}
csum_offset = (offset - found_key.offset) >>
root->fs_info->sb->s_blocksize_bits;
if (csum_offset >=
btrfs_item_size(leaf->items + path->slots[0]) /
sizeof(struct btrfs_csum_item)) {
printk("fail3, csum offset %lu size %u\n", csum_offset, btrfs_item_size(leaf->items + path->slots[0]) / sizeof(struct btrfs_csum_item));
goto fail;
}
}
Expand All @@ -89,7 +95,7 @@ static struct btrfs_csum_item *__lookup_csum_item(struct btrfs_root *root,
return item;
fail:
if (ret > 0)
ret = -EIO;
ret = -ENOENT;
return ERR_PTR(ret);
}

Expand All @@ -105,15 +111,17 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
int cow = mod != 0;
struct btrfs_csum_item *csum_item;

csum_item = __lookup_csum_item(root, path, objectid, offset);
csum_item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0);
if (IS_ERR(csum_item))
return PTR_ERR(csum_item);
file_key.objectid = objectid;
file_key.offset = btrfs_csum_extent_offset(csum_item);
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
btrfs_release_path(root, path);
printk("lookup file extent searches for %Lu\n", file_key.offset);
ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
printk("ret is %d\n", ret);
return ret;
}

Expand All @@ -134,17 +142,23 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);

item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0);
if (!IS_ERR(item))
goto found;
btrfs_release_path(root, path);
file_key.objectid = objectid;
file_key.offset = offset;
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
printk("searching for csum %Lu %Lu\n", objectid, offset);
ret = btrfs_search_slot(trans, root, &file_key, path,
sizeof(struct btrfs_csum_item), 1);
printk("ret %d\n", ret);
if (ret < 0)
goto fail;
if (ret == 0) {
csum_offset = 0;
goto csum;
BUG();
}
if (path->slots[0] == 0) {
btrfs_release_path(root, path);
Expand All @@ -153,24 +167,29 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
path->slots[0]--;
leaf = btrfs_buffer_leaf(path->nodes[0]);
btrfs_disk_key_to_cpu(&found_key, &leaf->items[path->slots[0]].key);
printk("found key %Lu %Lu %u\n", found_key.objectid, found_key.offset, found_key.flags);
csum_offset = (offset - found_key.offset) >>
root->fs_info->sb->s_blocksize_bits;
printk("csum_offset %Lu\n", csum_offset);
if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
found_key.objectid != objectid ||
csum_offset >= MAX_CSUM_ITEMS(root)) {
btrfs_release_path(root, path);
printk("insert1\n");
goto insert;
}
if (csum_offset >= btrfs_item_size(leaf->items + path->slots[0]) /
sizeof(struct btrfs_csum_item)) {
ret = btrfs_extend_item(trans, root, path,
sizeof(struct btrfs_csum_item));
BUG_ON(ret);
printk("item extended\n");
goto csum;
}

insert:
csum_offset = 0;
printk("inserting item %Lu %Lu %u\n", file_key.objectid, file_key.offset, file_key.flags);
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
sizeof(struct btrfs_csum_item));
if (ret != 0 && ret != -EEXIST)
Expand All @@ -180,12 +199,14 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
struct btrfs_csum_item);
ret = 0;
item += csum_offset;
found:
ret = btrfs_csum_data(root, data, len, item->csum);
btrfs_set_csum_extent_offset(item, extent_offset);
btrfs_mark_buffer_dirty(path->nodes[0]);
fail:
btrfs_release_path(root, path);
btrfs_free_path(path);
printk("return ret %d\n", ret);
return ret;
}

Expand All @@ -208,7 +229,7 @@ int btrfs_csum_verify_file_block(struct btrfs_root *root,
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
mutex_lock(&root->fs_info->fs_mutex);

item = __lookup_csum_item(root, path, objectid, offset);
item = btrfs_lookup_csum(NULL, root, path, objectid, offset, 0);
if (IS_ERR(item)) {
ret = PTR_ERR(item);
goto fail;
Expand Down
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