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Btrfs: rework csums and extent item ordering 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-04-17 15:39:32 -04:00 committed by David Woodhouse
parent b18c668581
commit 70b2befd0c
6 changed files with 37 additions and 168 deletions
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9
fs/btrfs/ctree.c
View File

@ -115,14 +115,14 @@ static int comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
return 1;
if (k1.objectid < k2->objectid)
return -1;
if (k1.offset > k2->offset)
return 1;
if (k1.offset < k2->offset)
return -1;
if (k1.flags > k2->flags)
return 1;
if (k1.flags < k2->flags)
return -1;
if (k1.offset > k2->offset)
return 1;
if (k1.offset < k2->offset)
return -1;
return 0;
}
@ -1292,7 +1292,6 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans,
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);

17
fs/btrfs/ctree.h
View File

@ -44,14 +44,14 @@ extern struct kmem_cache *btrfs_path_cachep;
*/
struct btrfs_disk_key {
__le64 objectid;
__le64 offset;
__le32 flags;
__le64 offset;
} __attribute__ ((__packed__));
struct btrfs_key {
u64 objectid;
u64 offset;
u32 flags;
u64 offset;
} __attribute__ ((__packed__));
/*
@ -227,7 +227,6 @@ struct btrfs_file_extent_item {
} __attribute__ ((__packed__));
struct btrfs_csum_item {
__le64 extent_offset;
u8 csum[BTRFS_CSUM_SIZE];
} __attribute__ ((__packed__));
@ -925,17 +924,6 @@ static inline void btrfs_set_file_extent_num_blocks(struct
e->num_blocks = cpu_to_le64(val);
}
static inline u64 btrfs_csum_extent_offset(struct btrfs_csum_item *c)
{
return le64_to_cpu(c->extent_offset);
}
static inline void btrfs_set_csum_extent_offset(struct btrfs_csum_item *c,
u64 val)
{
c->extent_offset = cpu_to_le64(val);
}
static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
{
return le16_to_cpu(d->pathlen);
@ -1091,7 +1079,6 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 offset,
u64 extent_offset,
char *data, size_t len);
int btrfs_csum_verify_file_block(struct btrfs_root *root,
u64 objectid, u64 offset,

18
fs/btrfs/dir-item.c
View File

@ -103,7 +103,7 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
key.objectid = dir;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
// btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
ret = btrfs_name_hash(name, name_len, &key.offset);
BUG_ON(ret);
while(1) {
@ -146,19 +146,29 @@ int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
int cow = mod != 0;
struct btrfs_disk_key *found_key;
struct btrfs_leaf *leaf;
int overflow = 0;
key.objectid = dir;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
key.offset = objectid;
while(1) {
btrfs_set_key_overflow(&key, overflow);
ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
if (ret < 0)
return ret;
if (ret > 0) {
if (path->slots[0] == 0)
if (overflow >= BTRFS_KEY_OVERFLOW_MAX)
return 1;
path->slots[0]--;
overflow++;
btrfs_set_key_overflow(&key, overflow);
btrfs_release_path(root, path);
continue;
} else {
/* found */
break;
}
}
leaf = btrfs_buffer_leaf(path->nodes[0]);
found_key = &leaf->items[path->slots[0]].key;

2
fs/btrfs/disk-io.c
View File

@ -24,7 +24,6 @@ int btrfs_insert_dev_radix(struct btrfs_root *root,
u64 num_blocks)
{
struct dev_lookup *lookup;
char b[BDEVNAME_SIZE];
int ret;
lookup = kmalloc(sizeof(*lookup), GFP_NOFS);
@ -34,7 +33,6 @@ int btrfs_insert_dev_radix(struct btrfs_root *root,
lookup->num_blocks = num_blocks;
lookup->bdev = bdev;
lookup->device_id = device_id;
printk("inserting %s into dev radix %Lu %Lu\n", bdevname(bdev, b), block_start, num_blocks);
ret = radix_tree_insert(&root->fs_info->dev_radix, block_start +
num_blocks - 1, lookup);

26
fs/btrfs/file-item.c
View File

@ -62,23 +62,19 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
file_key.offset = offset;
file_key.flags = 0;
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
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) {
printk("fail1\n");
if (path->slots[0] == 0)
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) >>
@ -86,7 +82,6 @@ printk("fail2 type %u %Lu %Lu\n", btrfs_key_type(&found_key), found_key.objectid
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;
}
}
@ -109,26 +104,18 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_key file_key;
int ins_len = mod < 0 ? -1 : 0;
int cow = mod != 0;
struct btrfs_csum_item *csum_item;
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.offset = offset;
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;
}
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 offset,
u64 extent_offset,
char *data, size_t len)
{
int ret;
@ -151,10 +138,8 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
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) {
@ -167,15 +152,12 @@ printk("ret %d\n", ret);
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]) /
@ -183,13 +165,11 @@ printk("insert1\n");
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)
@ -201,12 +181,10 @@ csum:
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;
}

123
fs/btrfs/super.c
View File

@ -524,7 +524,7 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
int advance;
unsigned char d_type = DT_UNKNOWN;
int over = 0;
int key_type = BTRFS_DIR_INDEX_KEY;
int key_type = BTRFS_DIR_ITEM_KEY;
/* FIXME, use a real flag for deciding about the key type */
if (root->fs_info->tree_root == root)
@ -561,9 +561,6 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
item = leaf->items + slot;
if (btrfs_disk_key_objectid(&item->key) != key.objectid)
break;
if (key_type == BTRFS_DIR_INDEX_KEY &&
btrfs_disk_key_offset(&item->key) > root->highest_inode)
break;
if (btrfs_disk_key_type(&item->key) != key_type)
continue;
if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
@ -1119,7 +1116,6 @@ allocate:
out:
btrfs_release_path(root, path);
btrfs_free_path(path);
printk("mapping iblock %lu to %lu\n", iblock, result->b_blocknr);
if (trans)
btrfs_end_transaction(trans, root);
return err;
@ -1233,7 +1229,6 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
struct file *file,
struct page **pages,
size_t num_pages,
u64 extent_offset,
loff_t pos,
size_t write_bytes)
{
@ -1253,7 +1248,6 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
trans = btrfs_start_transaction(root, 1);
btrfs_csum_file_block(trans, root, inode->i_ino,
pages[i]->index << PAGE_CACHE_SHIFT,
extent_offset,
kmap(pages[i]), PAGE_CACHE_SIZE);
kunmap(pages[i]);
SetPageChecked(pages[i]);
@ -1275,86 +1269,6 @@ failed:
return err;
}
static int drop_csums(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode,
u64 start, u64 end)
{
struct btrfs_path *path;
struct btrfs_leaf *leaf;
struct btrfs_key key;
int slot;
struct btrfs_csum_item *item;
char *old_block = NULL;
u64 cur = start;
u64 found_end;
u64 num_csums;
u64 item_size;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
while(cur < end) {
item = btrfs_lookup_csum(trans, root, path,
inode->i_ino, cur, 1);
if (IS_ERR(item)) {
cur += root->blocksize;
continue;
}
leaf = btrfs_buffer_leaf(path->nodes[0]);
slot = path->slots[0];
btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
item_size = btrfs_item_size(leaf->items + slot);
num_csums = item_size / sizeof(struct btrfs_csum_item);
found_end = key.offset + (num_csums << inode->i_blkbits);
cur = found_end;
if (found_end > end) {
char *src;
old_block = kmalloc(root->blocksize, GFP_NOFS);
src = btrfs_item_ptr(leaf, slot, char);
memcpy(old_block, src, item_size);
}
if (key.offset < start) {
u64 new_size = (start - key.offset) >>
inode->i_blkbits;
new_size *= sizeof(struct btrfs_csum_item);
ret = btrfs_truncate_item(trans, root, path, new_size);
BUG_ON(ret);
} else {
btrfs_del_item(trans, root, path);
}
btrfs_release_path(root, path);
if (found_end > end) {
char *dst;
int i;
int new_size;
num_csums = (found_end - end) >> inode->i_blkbits;
new_size = num_csums * sizeof(struct btrfs_csum_item);
key.offset = end;
ret = btrfs_insert_empty_item(trans, root, path,
&key, new_size);
BUG_ON(ret);
dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0], char);
memcpy(dst, old_block + item_size - new_size,
new_size);
item = (struct btrfs_csum_item *)dst;
for (i = 0; i < num_csums; i++) {
btrfs_set_csum_extent_offset(item, end);
item++;
}
mark_buffer_dirty(path->nodes[0]);
kfree(old_block);
break;
}
}
btrfs_free_path(path);
return 0;
}
static int drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode,
@ -1376,12 +1290,16 @@ static int drop_extents(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
search_again:
printk("drop extent inode %lu start %Lu end %Lu\n", inode->i_ino, start, end);
ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
search_start, -1);
if (ret != 0) {
printk("lookup failed\n");
if (ret < 0)
goto out;
if (ret > 0) {
if (path->slots[0] == 0) {
ret = -ENOENT;
goto out;
}
path->slots[0]--;
}
while(1) {
keep = 0;
@ -1390,14 +1308,11 @@ printk("lookup failed\n");
slot = path->slots[0];
btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
printk("found key %Lu %Lu %u\n", key.objectid, key.offset, key.flags);
extent = btrfs_item_ptr(leaf, slot,
struct btrfs_file_extent_item);
extent_end = key.offset +
(btrfs_file_extent_num_blocks(extent) <<
inode->i_blkbits);
printk("extent end is %Lu\n", extent_end);
if (key.offset >= end || key.objectid != inode->i_ino) {
ret = 0;
goto out;
@ -1420,16 +1335,12 @@ printk("extent end is %Lu\n", extent_end);
keep = 1;
WARN_ON(start & (root->blocksize - 1));
new_num = (start - key.offset) >> inode->i_blkbits;
printk("truncating existing extent, was %Lu ", btrfs_file_extent_num_blocks(extent));
btrfs_set_file_extent_num_blocks(extent, new_num);
printk("now %Lu\n", btrfs_file_extent_num_blocks(extent));
mark_buffer_dirty(path->nodes[0]);
}
if (!keep) {
u64 disk_blocknr;
u64 disk_num_blocks;
printk("del old\n");
disk_blocknr = btrfs_file_extent_disk_blocknr(extent);
disk_num_blocks =
btrfs_file_extent_disk_num_blocks(extent);
@ -1454,15 +1365,12 @@ printk("del old\n");
if (bookend) {
/* create bookend */
struct btrfs_key ins;
printk("bookend! extent end %Lu\n", extent_end);
ins.objectid = inode->i_ino;
ins.offset = end;
ins.flags = 0;
btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
btrfs_release_path(root, path);
ret = drop_csums(trans, root, inode, start, end);
BUG_ON(ret);
ret = btrfs_insert_empty_item(trans, root, path, &ins,
sizeof(*extent));
BUG_ON(ret);
@ -1486,10 +1394,9 @@ printk("bookend! extent end %Lu\n", extent_end);
btrfs_set_file_extent_generation(extent,
btrfs_file_extent_generation(&old));
printk("new bookend at offset %Lu, file_extent_offset %Lu, file_extent_num_blocks %Lu\n", end, btrfs_file_extent_offset(extent), btrfs_file_extent_num_blocks(extent));
btrfs_mark_buffer_dirty(path->nodes[0]);
ret = 0;
goto out_nocsum;
goto out;
}
next_leaf:
if (slot >= btrfs_header_nritems(&leaf->header) - 1) {
@ -1504,10 +1411,6 @@ next_leaf:
}
out:
ret = drop_csums(trans, root, inode, start, end);
BUG_ON(ret);
out_nocsum:
btrfs_free_path(path);
return ret;
}
@ -1556,7 +1459,6 @@ static int prepare_pages(struct btrfs_root *root,
head = page_buffers(pages[i]);
bh = head;
do {
printk("mapping page %lu to block %Lu\n", pages[i]->index, alloc_extent_start);
err = btrfs_map_bh_to_logical(root, bh,
alloc_extent_start);
BUG_ON(err);
@ -1597,7 +1499,6 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
u64 start_pos;
u64 num_blocks;
u64 alloc_extent_start;
u64 orig_extent_start;
struct btrfs_trans_handle *trans;
struct btrfs_key ins;
@ -1640,7 +1541,6 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
(pos + count + root->blocksize -1) &
~(root->blocksize - 1));
}
orig_extent_start = start_pos;
ret = btrfs_alloc_extent(trans, root, num_blocks, 1,
(u64)-1, &ins);
BUG_ON(ret);
@ -1656,7 +1556,6 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
PAGE_CACHE_SHIFT;
printk("num_pages is %lu\n", num_pages);
memset(pages, 0, sizeof(pages));
ret = prepare_pages(root, file, pages, num_pages,
@ -1670,10 +1569,8 @@ printk("num_pages is %lu\n", num_pages);
write_bytes, pages, buf);
BUG_ON(ret);
printk("2num_pages is %lu\n", num_pages);
ret = dirty_and_release_pages(NULL, root, file, pages,
num_pages, orig_extent_start,
pos, write_bytes);
num_pages, pos, write_bytes);
BUG_ON(ret);
btrfs_drop_pages(pages, num_pages);