Btrfs: Allow tree blocks larger than the page size
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fbe2836..d6b3a55 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -77,19 +77,19 @@
struct btrfs_trans_handle *trans;
struct btrfs_key ins;
u64 alloc_hint = 0;
- u64 num_blocks;
+ u64 num_bytes;
int ret;
- u64 blocksize = 1 << inode->i_blkbits;
+ u64 blocksize = root->sectorsize;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
BUG_ON(!trans);
- num_blocks = (end - start + blocksize) & ~(blocksize - 1);
+ num_bytes = (end - start + blocksize) & ~(blocksize - 1);
ret = btrfs_drop_extents(trans, root, inode,
- start, start + num_blocks, &alloc_hint);
- num_blocks = num_blocks >> inode->i_blkbits;
- ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_blocks, 0,
+ start, start + num_bytes, &alloc_hint);
+
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_bytes, 0,
alloc_hint, (u64)-1, &ins, 1);
if (ret) {
WARN_ON(1);
@@ -186,7 +186,8 @@
zeroit:
printk("btrfs csum failed ino %lu off %llu\n",
page->mapping->host->i_ino, (unsigned long long)start);
- memset(kaddr + offset, 1, end - start + 1); flush_dcache_page(page);
+ memset(kaddr + offset, 1, end - start + 1);
+ flush_dcache_page(page);
kunmap_atomic(kaddr, KM_IRQ0);
return 0;
}
@@ -547,7 +548,7 @@
struct extent_buffer *leaf;
struct btrfs_file_extent_item *fi;
u64 extent_start = 0;
- u64 extent_num_blocks = 0;
+ u64 extent_num_bytes = 0;
u64 item_end = 0;
int found_extent;
int del_item;
@@ -593,8 +594,7 @@
if (btrfs_file_extent_type(leaf, fi) !=
BTRFS_FILE_EXTENT_INLINE) {
item_end +=
- btrfs_file_extent_num_blocks(leaf, fi) <<
- inode->i_blkbits;
+ btrfs_file_extent_num_bytes(leaf, fi);
}
}
if (found_type == BTRFS_CSUM_ITEM_KEY) {
@@ -626,28 +626,27 @@
btrfs_file_extent_type(leaf, fi) !=
BTRFS_FILE_EXTENT_INLINE) {
u64 num_dec;
- extent_start = btrfs_file_extent_disk_blocknr(leaf, fi);
+ extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
if (!del_item) {
- u64 orig_num_blocks =
- btrfs_file_extent_num_blocks(leaf, fi);
- extent_num_blocks = inode->i_size -
+ u64 orig_num_bytes =
+ btrfs_file_extent_num_bytes(leaf, fi);
+ extent_num_bytes = inode->i_size -
found_key.offset + root->sectorsize - 1;
- extent_num_blocks >>= inode->i_blkbits;
- btrfs_set_file_extent_num_blocks(leaf, fi,
- extent_num_blocks);
- num_dec = (orig_num_blocks -
- extent_num_blocks) << 3;
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ extent_num_bytes);
+ num_dec = (orig_num_bytes -
+ extent_num_bytes) >> 9;
if (extent_start != 0) {
inode->i_blocks -= num_dec;
}
btrfs_mark_buffer_dirty(leaf);
} else {
- extent_num_blocks =
- btrfs_file_extent_disk_num_blocks(leaf,
- fi);
+ extent_num_bytes =
+ btrfs_file_extent_disk_num_bytes(leaf,
+ fi);
/* FIXME blocksize != 4096 */
- num_dec = btrfs_file_extent_num_blocks(leaf,
- fi) << 3;
+ num_dec = btrfs_file_extent_num_bytes(leaf,
+ fi) >> 9;
if (extent_start != 0) {
found_extent = 1;
inode->i_blocks -= num_dec;
@@ -664,7 +663,7 @@
btrfs_release_path(root, path);
if (found_extent) {
ret = btrfs_free_extent(trans, root, extent_start,
- extent_num_blocks, 0);
+ extent_num_bytes, 0);
BUG_ON(ret);
}
}
@@ -709,7 +708,8 @@
static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
{
struct inode *inode = mapping->host;
- unsigned blocksize = 1 << inode->i_blkbits;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u32 blocksize = root->sectorsize;
pgoff_t index = from >> PAGE_CACHE_SHIFT;
unsigned offset = from & (PAGE_CACHE_SIZE-1);
struct page *page;
@@ -719,7 +719,7 @@
if ((offset & (blocksize - 1)) == 0)
goto out;
- down_read(&BTRFS_I(inode)->root->snap_sem);
+ down_read(&root->snap_sem);
ret = -ENOMEM;
page = grab_cache_page(mapping, index);
if (!page)
@@ -778,8 +778,6 @@
err = btrfs_drop_extents(trans, root, inode,
pos, pos + hole_size, &alloc_hint);
- hole_size >>= inode->i_blkbits;
-
err = btrfs_insert_file_extent(trans, root, inode->i_ino,
pos, 0, 0, hole_size);
btrfs_end_transaction(trans, root);
@@ -1490,7 +1488,7 @@
{
int ret;
int err = 0;
- u64 blocknr;
+ u64 bytenr;
u64 extent_start = 0;
u64 extent_end = 0;
u64 objectid = inode->i_ino;
@@ -1540,10 +1538,6 @@
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
-
- blocknr = btrfs_file_extent_disk_blocknr(leaf, item);
- blocknr += btrfs_file_extent_offset(leaf, item);
-
/* are we inside the extent that was found? */
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
found_type = btrfs_key_type(&found_key);
@@ -1556,8 +1550,7 @@
extent_start = found_key.offset;
if (found_type == BTRFS_FILE_EXTENT_REG) {
extent_end = extent_start +
- (btrfs_file_extent_num_blocks(leaf, item) <<
- inode->i_blkbits);
+ btrfs_file_extent_num_bytes(leaf, item);
err = 0;
if (start < extent_start || start >= extent_end) {
em->start = start;
@@ -1570,17 +1563,18 @@
}
goto not_found_em;
}
- if (btrfs_file_extent_disk_blocknr(leaf, item) == 0) {
+ bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
+ if (bytenr == 0) {
em->start = extent_start;
em->end = extent_end - 1;
em->block_start = EXTENT_MAP_HOLE;
em->block_end = EXTENT_MAP_HOLE;
goto insert;
}
- em->block_start = blocknr << inode->i_blkbits;
+ bytenr += btrfs_file_extent_offset(leaf, item);
+ em->block_start = bytenr;
em->block_end = em->block_start +
- (btrfs_file_extent_num_blocks(leaf, item) <<
- inode->i_blkbits) - 1;
+ btrfs_file_extent_num_bytes(leaf, item) - 1;
em->start = extent_start;
em->end = extent_end - 1;
goto insert;
@@ -1592,7 +1586,8 @@
size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
path->slots[0]));
- extent_end = extent_start | ((u64)root->sectorsize - 1);
+ extent_end = (extent_start + size) |
+ ((u64)root->sectorsize - 1);
if (start < extent_start || start >= extent_end) {
em->start = start;
if (start < extent_start) {
@@ -1617,8 +1612,10 @@
ptr = btrfs_file_extent_inline_start(item);
map = kmap(page);
read_extent_buffer(leaf, map + page_offset, ptr, size);
+ /*
memset(map + page_offset + size, 0,
root->sectorsize - (page_offset + size));
+ */
flush_dcache_page(page);
kunmap(page);
set_extent_uptodate(em_tree, extent_start,
@@ -1836,13 +1833,13 @@
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
- leaf = btrfs_alloc_free_block(trans, root, 0, 0);
+ leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 0);
if (IS_ERR(leaf))
return PTR_ERR(leaf);
btrfs_set_header_nritems(leaf, 0);
btrfs_set_header_level(leaf, 0);
- btrfs_set_header_blocknr(leaf, extent_buffer_blocknr(leaf));
+ btrfs_set_header_bytenr(leaf, leaf->start);
btrfs_set_header_generation(leaf, trans->transid);
btrfs_set_header_owner(leaf, root->root_key.objectid);
write_extent_buffer(leaf, root->fs_info->fsid,
@@ -1858,7 +1855,8 @@
inode_item->nblocks = cpu_to_le64(1);
inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
- btrfs_set_root_blocknr(&root_item, extent_buffer_blocknr(leaf));
+ btrfs_set_root_bytenr(&root_item, leaf->start);
+ btrfs_set_root_level(&root_item, 0);
btrfs_set_root_refs(&root_item, 1);
btrfs_set_root_used(&root_item, 0);
@@ -1971,8 +1969,8 @@
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
- btrfs_set_root_blocknr(&new_root_item,
- extent_buffer_blocknr(root->node));
+ btrfs_set_root_bytenr(&new_root_item, root->node->start);
+ btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node));
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
&new_root_item);
