Btrfs: rework csums and extent item ordering
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 6a56416..b2a2220 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -524,7 +524,7 @@
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 @@
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 @@
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 @@
struct file *file,
struct page **pages,
size_t num_pages,
- u64 extent_offset,
loff_t pos,
size_t write_bytes)
{
@@ -1253,7 +1248,6 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
}
out:
- ret = drop_csums(trans, root, inode, start, end);
- BUG_ON(ret);
-
-out_nocsum:
btrfs_free_path(path);
return ret;
}
@@ -1556,7 +1459,6 @@
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 @@
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 @@
(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 @@
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 @@
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);