mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-20 08:38:24 +08:00
Btrfs: Add back metadata checksumming
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
parent
0f82731fc5
commit
19c00ddcc3
@ -310,9 +310,11 @@ struct btrfs_fs_info {
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struct extent_buffer *sb_buffer;
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struct super_block *sb;
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struct inode *btree_inode;
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spinlock_t hash_lock;
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struct mutex trans_mutex;
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struct mutex fs_mutex;
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struct list_head trans_list;
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struct list_head hashers;
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struct list_head dead_roots;
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struct delayed_work trans_work;
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struct kobject super_kobj;
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@ -60,7 +60,7 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
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struct extent_buffer *eb;
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eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
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bytenr, blocksize, GFP_NOFS);
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bytenr, blocksize, NULL, GFP_NOFS);
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return eb;
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}
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@ -99,10 +99,102 @@ out:
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return em;
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}
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u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
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{
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return crc32c(seed, data, len);
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}
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void btrfs_csum_final(u32 crc, char *result)
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{
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*(__le32 *)result = ~cpu_to_le32(crc);
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}
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static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
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int verify)
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{
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char result[BTRFS_CRC32_SIZE];
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unsigned long len;
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unsigned long cur_len;
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unsigned long offset = BTRFS_CSUM_SIZE;
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char *map_token = NULL;
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char *kaddr;
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unsigned long map_start;
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unsigned long map_len;
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int err;
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u32 crc = ~(u32)0;
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len = buf->len - offset;
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while(len > 0) {
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err = map_private_extent_buffer(buf, offset, 32,
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&map_token, &kaddr,
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&map_start, &map_len, KM_USER0);
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if (err) {
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printk("failed to map extent buffer! %lu\n",
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offset);
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return 1;
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}
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cur_len = min(len, map_len - (offset - map_start));
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crc = btrfs_csum_data(root, kaddr + offset - map_start,
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crc, cur_len);
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len -= cur_len;
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offset += cur_len;
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unmap_extent_buffer(buf, map_token, KM_USER0);
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}
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btrfs_csum_final(crc, result);
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if (verify) {
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if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
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printk("btrfs: %s checksum verify failed on %llu\n",
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root->fs_info->sb->s_id,
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buf->start);
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return 1;
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}
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} else {
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write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
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}
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return 0;
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}
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int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
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{
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struct extent_map_tree *tree;
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u64 start = page->index << PAGE_CACHE_SHIFT;
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u64 found_start;
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int found_level;
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unsigned long len;
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struct extent_buffer *eb;
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tree = &BTRFS_I(page->mapping->host)->extent_tree;
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if (page->private == EXTENT_PAGE_PRIVATE)
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goto out;
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if (!page->private)
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goto out;
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len = page->private >> 2;
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if (len == 0) {
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WARN_ON(1);
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}
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eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
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read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1);
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found_start = btrfs_header_bytenr(eb);
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if (found_start != start) {
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printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
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start, found_start, len);
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}
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found_level = btrfs_header_level(eb);
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csum_tree_block(root, eb, 0);
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free_extent_buffer(eb);
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out:
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return 0;
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}
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static int btree_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct extent_map_tree *tree;
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struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
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tree = &BTRFS_I(page->mapping->host)->extent_tree;
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csum_dirty_buffer(root, page);
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return extent_write_full_page(tree, page, btree_get_extent, wbc);
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}
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int btree_readpage(struct file *file, struct page *page)
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@ -117,7 +209,6 @@ static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
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struct extent_map_tree *tree;
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int ret;
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BUG_ON(page->private != 1);
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tree = &BTRFS_I(page->mapping->host)->extent_tree;
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ret = try_release_extent_mapping(tree, page);
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if (ret == 1) {
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@ -136,46 +227,6 @@ static void btree_invalidatepage(struct page *page, unsigned long offset)
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btree_releasepage(page, GFP_NOFS);
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}
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int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
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char *result)
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{
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return 0;
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#if 0
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u32 crc;
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crc = crc32c(0, data, len);
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memcpy(result, &crc, BTRFS_CRC32_SIZE);
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return 0;
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#endif
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}
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#if 0
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static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
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int verify)
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{
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return 0;
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char result[BTRFS_CRC32_SIZE];
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int ret;
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struct btrfs_node *node;
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ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
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bh->b_size - BTRFS_CSUM_SIZE, result);
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if (ret)
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return ret;
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if (verify) {
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if (memcmp(bh->b_data, result, BTRFS_CRC32_SIZE)) {
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printk("btrfs: %s checksum verify failed on %llu\n",
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root->fs_info->sb->s_id,
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(unsigned long long)bh_blocknr(bh));
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return 1;
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}
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} else {
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node = btrfs_buffer_node(bh);
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memcpy(node->header.csum, result, BTRFS_CRC32_SIZE);
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}
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return 0;
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}
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#endif
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#if 0
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static int btree_writepage(struct page *page, struct writeback_control *wbc)
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{
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@ -215,7 +266,7 @@ int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
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if (!buf)
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return 0;
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read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
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buf, 0);
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buf, 0, 0);
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free_extent_buffer(buf);
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return ret;
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}
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@ -225,12 +276,29 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
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{
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struct extent_buffer *buf = NULL;
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struct inode *btree_inode = root->fs_info->btree_inode;
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struct extent_map_tree *extent_tree;
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int ret;
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extent_tree = &BTRFS_I(btree_inode)->extent_tree;
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buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
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if (!buf)
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return NULL;
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read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
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buf, 1);
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buf, 0, 1);
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if (buf->flags & EXTENT_CSUM) {
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return buf;
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}
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if (test_range_bit(extent_tree, buf->start, buf->start + buf->len - 1,
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EXTENT_CSUM, 1)) {
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buf->flags |= EXTENT_CSUM;
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return buf;
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}
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ret = csum_tree_block(root, buf, 1);
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set_extent_bits(extent_tree, buf->start,
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buf->start + buf->len - 1,
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EXTENT_CSUM, GFP_NOFS);
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buf->flags |= EXTENT_CSUM;
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return buf;
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}
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@ -251,13 +319,6 @@ int wait_on_tree_block_writeback(struct btrfs_root *root,
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return 0;
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}
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int set_tree_block_dirty(struct btrfs_root *root, struct extent_buffer *buf)
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{
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struct inode *btree_inode = root->fs_info->btree_inode;
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set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
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return 0;
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}
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static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
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struct btrfs_root *root,
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struct btrfs_fs_info *fs_info,
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@ -416,7 +477,24 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
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return root;
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}
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#if 0
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static int add_hasher(struct btrfs_fs_info *info, char *type) {
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struct btrfs_hasher *hasher;
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hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
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if (!hasher)
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return -ENOMEM;
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hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
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if (!hasher->hash_tfm) {
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kfree(hasher);
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return -EINVAL;
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}
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spin_lock(&info->hash_lock);
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list_add(&hasher->list, &info->hashers);
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spin_unlock(&info->hash_lock);
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return 0;
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}
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#endif
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struct btrfs_root *open_ctree(struct super_block *sb)
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{
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u32 sectorsize;
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@ -440,6 +518,9 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
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INIT_LIST_HEAD(&fs_info->trans_list);
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INIT_LIST_HEAD(&fs_info->dead_roots);
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INIT_LIST_HEAD(&fs_info->hashers);
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spin_lock_init(&fs_info->hash_lock);
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memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
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init_completion(&fs_info->kobj_unregister);
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sb_set_blocksize(sb, 4096);
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@ -479,6 +560,14 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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mutex_init(&fs_info->trans_mutex);
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mutex_init(&fs_info->fs_mutex);
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#if 0
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ret = add_hasher(fs_info, "crc32c");
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if (ret) {
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printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
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err = -ENOMEM;
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goto fail_iput;
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}
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#endif
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__setup_root(512, 512, 512, tree_root,
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fs_info, BTRFS_ROOT_TREE_OBJECTID);
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@ -509,25 +598,21 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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i_size_write(fs_info->btree_inode,
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btrfs_super_total_bytes(disk_super));
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if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
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sizeof(disk_super->magic))) {
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printk("btrfs: valid FS not found on %s\n", sb->s_id);
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goto fail_sb_buffer;
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}
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blocksize = btrfs_level_size(tree_root,
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btrfs_super_root_level(disk_super));
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tree_root->node = read_tree_block(tree_root,
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btrfs_super_root(disk_super),
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blocksize);
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if (!tree_root->node)
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goto fail_sb_buffer;
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#if 0
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btrfs_print_leaf(tree_root, tree_root->node);
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err = -EIO;
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goto fail_tree_root;
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#endif
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mutex_lock(&fs_info->fs_mutex);
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ret = find_and_setup_root(tree_root, fs_info,
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@ -634,9 +719,19 @@ int close_ctree(struct btrfs_root *root)
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btrfs_free_block_groups(root->fs_info);
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del_fs_roots(fs_info);
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extent_map_tree_cleanup(&BTRFS_I(fs_info->btree_inode)->extent_tree);
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extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree);
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truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
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iput(fs_info->btree_inode);
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#if 0
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while(!list_empty(&fs_info->hashers)) {
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struct btrfs_hasher *hasher;
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hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
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hashers);
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list_del(&hasher->hashers);
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crypto_free_hash(&fs_info->hash_tfm);
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kfree(hasher);
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}
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#endif
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kfree(fs_info->extent_root);
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kfree(fs_info->tree_root);
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return 0;
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@ -733,5 +828,5 @@ int btrfs_read_buffer(struct extent_buffer *buf)
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struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
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struct inode *btree_inode = root->fs_info->btree_inode;
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return read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
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buf, 1);
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buf, 0, 1);
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}
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@ -1178,6 +1178,10 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
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btrfs_set_buffer_uptodate(buf);
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set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
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buf->start + buf->len - 1, GFP_NOFS);
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set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->extent_tree,
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buf->start, buf->start + buf->len - 1,
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EXTENT_CSUM, GFP_NOFS);
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buf->flags |= EXTENT_CSUM;
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btrfs_set_buffer_defrag(buf);
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trans->blocks_used++;
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return buf;
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@ -81,7 +81,7 @@ void extent_map_tree_init(struct extent_map_tree *tree,
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}
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EXPORT_SYMBOL(extent_map_tree_init);
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void extent_map_tree_cleanup(struct extent_map_tree *tree)
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void extent_map_tree_empty_lru(struct extent_map_tree *tree)
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{
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struct extent_buffer *eb;
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while(!list_empty(&tree->buffer_lru)) {
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@ -91,7 +91,7 @@ void extent_map_tree_cleanup(struct extent_map_tree *tree)
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free_extent_buffer(eb);
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}
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}
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EXPORT_SYMBOL(extent_map_tree_cleanup);
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EXPORT_SYMBOL(extent_map_tree_empty_lru);
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struct extent_map *alloc_extent_map(gfp_t mask)
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{
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@ -1464,7 +1464,7 @@ void set_page_extent_mapped(struct page *page)
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if (!PagePrivate(page)) {
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SetPagePrivate(page);
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WARN_ON(!page->mapping->a_ops->invalidatepage);
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set_page_private(page, 1);
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set_page_private(page, EXTENT_PAGE_PRIVATE);
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page_cache_get(page);
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}
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}
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@ -1979,8 +1979,9 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_map_tree *tree,
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spin_lock(&tree->lru_lock);
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eb = find_lru(tree, start, len);
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if (eb)
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if (eb) {
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goto lru_add;
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}
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spin_unlock(&tree->lru_lock);
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if (eb) {
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@ -2007,6 +2008,7 @@ static void __free_extent_buffer(struct extent_buffer *eb)
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struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
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u64 start, unsigned long len,
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struct page *page0,
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gfp_t mask)
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{
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unsigned long num_pages = num_extent_pages(start, len);
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@ -2024,7 +2026,18 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
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if (eb->flags & EXTENT_BUFFER_FILLED)
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return eb;
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for (i = 0; i < num_pages; i++, index++) {
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if (page0) {
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eb->first_page = page0;
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i = 1;
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index++;
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page_cache_get(page0);
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set_page_extent_mapped(page0);
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set_page_private(page0, EXTENT_PAGE_PRIVATE_FIRST_PAGE |
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len << 2);
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} else {
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i = 0;
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}
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for (; i < num_pages; i++, index++) {
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p = find_or_create_page(mapping, index, mask | __GFP_HIGHMEM);
|
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if (!p) {
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WARN_ON(1);
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@ -2036,8 +2049,13 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
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goto fail;
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}
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set_page_extent_mapped(p);
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if (i == 0)
|
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if (i == 0) {
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eb->first_page = p;
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set_page_private(p, EXTENT_PAGE_PRIVATE_FIRST_PAGE |
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len << 2);
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} else {
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set_page_private(p, EXTENT_PAGE_PRIVATE);
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}
|
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if (!PageUptodate(p))
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uptodate = 0;
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unlock_page(p);
|
||||
@ -2057,8 +2075,7 @@ struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
|
||||
gfp_t mask)
|
||||
{
|
||||
unsigned long num_pages = num_extent_pages(start, len);
|
||||
unsigned long i;
|
||||
unsigned long index = start >> PAGE_CACHE_SHIFT;
|
||||
unsigned long i; unsigned long index = start >> PAGE_CACHE_SHIFT;
|
||||
struct extent_buffer *eb;
|
||||
struct page *p;
|
||||
struct address_space *mapping = tree->mapping;
|
||||
@ -2082,8 +2099,15 @@ struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
|
||||
goto fail;
|
||||
}
|
||||
set_page_extent_mapped(p);
|
||||
if (i == 0)
|
||||
|
||||
if (i == 0) {
|
||||
eb->first_page = p;
|
||||
set_page_private(p, EXTENT_PAGE_PRIVATE_FIRST_PAGE |
|
||||
len << 2);
|
||||
} else {
|
||||
set_page_private(p, EXTENT_PAGE_PRIVATE);
|
||||
}
|
||||
|
||||
if (!PageUptodate(p))
|
||||
uptodate = 0;
|
||||
unlock_page(p);
|
||||
@ -2174,7 +2198,21 @@ int set_extent_buffer_dirty(struct extent_map_tree *tree,
|
||||
|
||||
num_pages = num_extent_pages(eb->start, eb->len);
|
||||
for (i = 0; i < num_pages; i++) {
|
||||
struct page *page = extent_buffer_page(eb, i);
|
||||
/* writepage may need to do something special for the
|
||||
* first page, we have to make sure page->private is
|
||||
* properly set. releasepage may drop page->private
|
||||
* on us if the page isn't already dirty.
|
||||
*/
|
||||
if (i == 0) {
|
||||
lock_page(page);
|
||||
set_page_private(page,
|
||||
EXTENT_PAGE_PRIVATE_FIRST_PAGE |
|
||||
eb->len << 2);
|
||||
}
|
||||
__set_page_dirty_nobuffers(extent_buffer_page(eb, i));
|
||||
if (i == 0)
|
||||
unlock_page(page);
|
||||
}
|
||||
return set_extent_dirty(tree, eb->start,
|
||||
eb->start + eb->len - 1, GFP_NOFS);
|
||||
@ -2217,9 +2255,12 @@ int extent_buffer_uptodate(struct extent_map_tree *tree,
|
||||
EXPORT_SYMBOL(extent_buffer_uptodate);
|
||||
|
||||
int read_extent_buffer_pages(struct extent_map_tree *tree,
|
||||
struct extent_buffer *eb, int wait)
|
||||
struct extent_buffer *eb,
|
||||
u64 start,
|
||||
int wait)
|
||||
{
|
||||
unsigned long i;
|
||||
unsigned long start_i;
|
||||
struct page *page;
|
||||
int err;
|
||||
int ret = 0;
|
||||
@ -2232,9 +2273,16 @@ int read_extent_buffer_pages(struct extent_map_tree *tree,
|
||||
EXTENT_UPTODATE, 1)) {
|
||||
return 0;
|
||||
}
|
||||
if (start) {
|
||||
WARN_ON(start < eb->start);
|
||||
start_i = (start >> PAGE_CACHE_SHIFT) -
|
||||
(eb->start >> PAGE_CACHE_SHIFT);
|
||||
} else {
|
||||
start_i = 0;
|
||||
}
|
||||
|
||||
num_pages = num_extent_pages(eb->start, eb->len);
|
||||
for (i = 0; i < num_pages; i++) {
|
||||
for (i = start_i; i < num_pages; i++) {
|
||||
page = extent_buffer_page(eb, i);
|
||||
if (PageUptodate(page)) {
|
||||
continue;
|
||||
@ -2260,7 +2308,7 @@ int read_extent_buffer_pages(struct extent_map_tree *tree,
|
||||
return ret;
|
||||
}
|
||||
|
||||
for (i = 0; i < num_pages; i++) {
|
||||
for (i = start_i; i < num_pages; i++) {
|
||||
page = extent_buffer_page(eb, i);
|
||||
wait_on_page_locked(page);
|
||||
if (!PageUptodate(page)) {
|
||||
@ -2314,7 +2362,7 @@ void read_extent_buffer(struct extent_buffer *eb, void *dstv,
|
||||
}
|
||||
EXPORT_SYMBOL(read_extent_buffer);
|
||||
|
||||
static int __map_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
||||
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
||||
unsigned long min_len, char **token, char **map,
|
||||
unsigned long *map_start,
|
||||
unsigned long *map_len, int km)
|
||||
@ -2337,6 +2385,10 @@ static int __map_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
||||
offset = 0;
|
||||
*map_start = (i << PAGE_CACHE_SHIFT) - start_offset;
|
||||
}
|
||||
if (start + min_len >= eb->len) {
|
||||
printk("bad mapping eb start %Lu len %lu, wanted %lu %lu\n", eb->start, eb->len, start, min_len);
|
||||
WARN_ON(1);
|
||||
}
|
||||
|
||||
p = extent_buffer_page(eb, i);
|
||||
WARN_ON(!PageUptodate(p));
|
||||
@ -2346,6 +2398,7 @@ static int __map_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
||||
*map_len = PAGE_CACHE_SIZE - offset;
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(map_private_extent_buffer);
|
||||
|
||||
int map_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
||||
unsigned long min_len,
|
||||
@ -2360,8 +2413,8 @@ int map_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
||||
eb->map_token = NULL;
|
||||
save = 1;
|
||||
}
|
||||
err = __map_extent_buffer(eb, start, min_len, token, map,
|
||||
map_start, map_len, km);
|
||||
err = map_private_extent_buffer(eb, start, min_len, token, map,
|
||||
map_start, map_len, km);
|
||||
if (!err && save) {
|
||||
eb->map_token = *token;
|
||||
eb->kaddr = *map;
|
||||
|
||||
@ -17,8 +17,17 @@
|
||||
#define EXTENT_DEFRAG (1 << 6)
|
||||
#define EXTENT_DEFRAG_DONE (1 << 7)
|
||||
#define EXTENT_BUFFER_FILLED (1 << 8)
|
||||
#define EXTENT_CSUM (1 << 9)
|
||||
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
|
||||
|
||||
/*
|
||||
* page->private values. Every page that is controlled by the extent
|
||||
* map has page->private set to one.
|
||||
*/
|
||||
|
||||
#define EXTENT_PAGE_PRIVATE 1
|
||||
#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
|
||||
|
||||
|
||||
struct extent_map_ops {
|
||||
int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
|
||||
@ -89,7 +98,7 @@ typedef struct extent_map *(get_extent_t)(struct inode *inode,
|
||||
|
||||
void extent_map_tree_init(struct extent_map_tree *tree,
|
||||
struct address_space *mapping, gfp_t mask);
|
||||
void extent_map_tree_cleanup(struct extent_map_tree *tree);
|
||||
void extent_map_tree_empty_lru(struct extent_map_tree *tree);
|
||||
struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
|
||||
u64 start, u64 end);
|
||||
int add_extent_mapping(struct extent_map_tree *tree,
|
||||
@ -143,13 +152,14 @@ void set_page_extent_mapped(struct page *page);
|
||||
|
||||
struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
|
||||
u64 start, unsigned long len,
|
||||
struct page *page0,
|
||||
gfp_t mask);
|
||||
struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
|
||||
u64 start, unsigned long len,
|
||||
gfp_t mask);
|
||||
void free_extent_buffer(struct extent_buffer *eb);
|
||||
int read_extent_buffer_pages(struct extent_map_tree *tree,
|
||||
struct extent_buffer *eb, int wait);
|
||||
struct extent_buffer *eb, u64 start, int wait);
|
||||
|
||||
static inline void extent_buffer_get(struct extent_buffer *eb)
|
||||
{
|
||||
@ -187,5 +197,9 @@ int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
|
||||
unsigned long min_len, char **token, char **map,
|
||||
unsigned long *map_start,
|
||||
unsigned long *map_len, int km);
|
||||
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
|
||||
unsigned long min_len, char **token, char **map,
|
||||
unsigned long *map_start,
|
||||
unsigned long *map_len, int km);
|
||||
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
|
||||
#endif
|
||||
|
||||
@ -1713,10 +1713,6 @@ static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
|
||||
struct extent_map_tree *tree;
|
||||
int ret;
|
||||
|
||||
if (page->private != 1) {
|
||||
WARN_ON(1);
|
||||
return try_to_free_buffers(page);
|
||||
}
|
||||
tree = &BTRFS_I(page->mapping->host)->extent_tree;
|
||||
ret = try_release_extent_mapping(tree, page);
|
||||
if (ret == 1) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user