Btrfs: rework csums and extent item ordering
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
b18c668581
commit
70b2befd0c
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@ -115,14 +115,14 @@ static int comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
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return 1;
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if (k1.objectid < k2->objectid)
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return -1;
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if (k1.offset > k2->offset)
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return 1;
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if (k1.offset < k2->offset)
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return -1;
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if (k1.flags > k2->flags)
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return 1;
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if (k1.flags < k2->flags)
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return -1;
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if (k1.offset > k2->offset)
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return 1;
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if (k1.offset < k2->offset)
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return -1;
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return 0;
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}
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@ -1292,7 +1292,6 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans,
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ioff + size_diff);
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}
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/* shift the data */
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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);
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btrfs_memmove(root, leaf, btrfs_leaf_data(leaf) +
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data_end + size_diff, btrfs_leaf_data(leaf) +
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data_end, old_data_start + new_size - data_end);
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@ -44,14 +44,14 @@ extern struct kmem_cache *btrfs_path_cachep;
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*/
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struct btrfs_disk_key {
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__le64 objectid;
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__le64 offset;
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__le32 flags;
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__le64 offset;
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} __attribute__ ((__packed__));
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struct btrfs_key {
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u64 objectid;
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u64 offset;
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u32 flags;
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u64 offset;
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} __attribute__ ((__packed__));
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/*
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@ -227,7 +227,6 @@ struct btrfs_file_extent_item {
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} __attribute__ ((__packed__));
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struct btrfs_csum_item {
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__le64 extent_offset;
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u8 csum[BTRFS_CSUM_SIZE];
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} __attribute__ ((__packed__));
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@ -925,17 +924,6 @@ static inline void btrfs_set_file_extent_num_blocks(struct
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e->num_blocks = cpu_to_le64(val);
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}
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static inline u64 btrfs_csum_extent_offset(struct btrfs_csum_item *c)
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{
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return le64_to_cpu(c->extent_offset);
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}
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static inline void btrfs_set_csum_extent_offset(struct btrfs_csum_item *c,
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u64 val)
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{
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c->extent_offset = cpu_to_le64(val);
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}
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static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
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{
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return le16_to_cpu(d->pathlen);
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@ -1091,7 +1079,6 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
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int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 objectid, u64 offset,
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u64 extent_offset,
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char *data, size_t len);
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int btrfs_csum_verify_file_block(struct btrfs_root *root,
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u64 objectid, u64 offset,
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@ -103,7 +103,7 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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key.objectid = dir;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
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btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
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// btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
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ret = btrfs_name_hash(name, name_len, &key.offset);
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BUG_ON(ret);
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while(1) {
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@ -146,19 +146,29 @@ int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
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int cow = mod != 0;
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struct btrfs_disk_key *found_key;
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struct btrfs_leaf *leaf;
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int overflow = 0;
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key.objectid = dir;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
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btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
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key.offset = objectid;
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while(1) {
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btrfs_set_key_overflow(&key, overflow);
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ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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if (path->slots[0] == 0)
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if (overflow >= BTRFS_KEY_OVERFLOW_MAX)
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return 1;
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path->slots[0]--;
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overflow++;
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btrfs_set_key_overflow(&key, overflow);
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btrfs_release_path(root, path);
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continue;
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} else {
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/* found */
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break;
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}
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}
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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found_key = &leaf->items[path->slots[0]].key;
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@ -24,7 +24,6 @@ int btrfs_insert_dev_radix(struct btrfs_root *root,
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u64 num_blocks)
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{
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struct dev_lookup *lookup;
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char b[BDEVNAME_SIZE];
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int ret;
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lookup = kmalloc(sizeof(*lookup), GFP_NOFS);
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@ -34,7 +33,6 @@ int btrfs_insert_dev_radix(struct btrfs_root *root,
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lookup->num_blocks = num_blocks;
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lookup->bdev = bdev;
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lookup->device_id = device_id;
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printk("inserting %s into dev radix %Lu %Lu\n", bdevname(bdev, b), block_start, num_blocks);
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ret = radix_tree_insert(&root->fs_info->dev_radix, block_start +
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num_blocks - 1, lookup);
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@ -62,23 +62,19 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
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file_key.offset = offset;
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file_key.flags = 0;
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btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
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printk("__lookup for %Lu\n", offset);
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ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
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if (ret < 0)
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goto fail;
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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if (ret > 0) {
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ret = 1;
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if (path->slots[0] == 0) {
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printk("fail1\n");
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if (path->slots[0] == 0)
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goto fail;
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}
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path->slots[0]--;
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btrfs_disk_key_to_cpu(&found_key,
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&leaf->items[path->slots[0]].key);
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if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
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found_key.objectid != objectid) {
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printk("fail2 type %u %Lu %Lu\n", btrfs_key_type(&found_key), found_key.objectid, objectid);
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goto fail;
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}
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csum_offset = (offset - found_key.offset) >>
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@ -86,7 +82,6 @@ printk("fail2 type %u %Lu %Lu\n", btrfs_key_type(&found_key), found_key.objectid
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if (csum_offset >=
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btrfs_item_size(leaf->items + path->slots[0]) /
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sizeof(struct btrfs_csum_item)) {
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printk("fail3, csum offset %lu size %u\n", csum_offset, btrfs_item_size(leaf->items + path->slots[0]) / sizeof(struct btrfs_csum_item));
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goto fail;
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}
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}
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@ -109,26 +104,18 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_key file_key;
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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struct btrfs_csum_item *csum_item;
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csum_item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0);
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if (IS_ERR(csum_item))
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return PTR_ERR(csum_item);
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file_key.objectid = objectid;
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file_key.offset = btrfs_csum_extent_offset(csum_item);
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file_key.offset = offset;
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file_key.flags = 0;
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btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
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btrfs_release_path(root, path);
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printk("lookup file extent searches for %Lu\n", file_key.offset);
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ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
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printk("ret is %d\n", ret);
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return ret;
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}
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int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 objectid, u64 offset,
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u64 extent_offset,
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char *data, size_t len)
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{
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int ret;
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@ -151,10 +138,8 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
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file_key.offset = offset;
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file_key.flags = 0;
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btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
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printk("searching for csum %Lu %Lu\n", objectid, offset);
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ret = btrfs_search_slot(trans, root, &file_key, path,
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sizeof(struct btrfs_csum_item), 1);
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printk("ret %d\n", ret);
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if (ret < 0)
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goto fail;
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if (ret == 0) {
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@ -167,15 +152,12 @@ printk("ret %d\n", ret);
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path->slots[0]--;
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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btrfs_disk_key_to_cpu(&found_key, &leaf->items[path->slots[0]].key);
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printk("found key %Lu %Lu %u\n", found_key.objectid, found_key.offset, found_key.flags);
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csum_offset = (offset - found_key.offset) >>
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root->fs_info->sb->s_blocksize_bits;
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printk("csum_offset %Lu\n", csum_offset);
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if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY ||
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found_key.objectid != objectid ||
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csum_offset >= MAX_CSUM_ITEMS(root)) {
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btrfs_release_path(root, path);
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printk("insert1\n");
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goto insert;
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}
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if (csum_offset >= btrfs_item_size(leaf->items + path->slots[0]) /
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@ -183,13 +165,11 @@ printk("insert1\n");
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ret = btrfs_extend_item(trans, root, path,
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sizeof(struct btrfs_csum_item));
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BUG_ON(ret);
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printk("item extended\n");
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goto csum;
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}
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insert:
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csum_offset = 0;
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printk("inserting item %Lu %Lu %u\n", file_key.objectid, file_key.offset, file_key.flags);
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ret = btrfs_insert_empty_item(trans, root, path, &file_key,
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sizeof(struct btrfs_csum_item));
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if (ret != 0 && ret != -EEXIST)
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@ -201,12 +181,10 @@ csum:
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item += csum_offset;
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found:
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ret = btrfs_csum_data(root, data, len, item->csum);
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btrfs_set_csum_extent_offset(item, extent_offset);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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fail:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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printk("return ret %d\n", ret);
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return ret;
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}
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123
fs/btrfs/super.c
123
fs/btrfs/super.c
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@ -524,7 +524,7 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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int advance;
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unsigned char d_type = DT_UNKNOWN;
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int over = 0;
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int key_type = BTRFS_DIR_INDEX_KEY;
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int key_type = BTRFS_DIR_ITEM_KEY;
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/* FIXME, use a real flag for deciding about the key type */
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if (root->fs_info->tree_root == root)
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@ -561,9 +561,6 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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item = leaf->items + slot;
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if (btrfs_disk_key_objectid(&item->key) != key.objectid)
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break;
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if (key_type == BTRFS_DIR_INDEX_KEY &&
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btrfs_disk_key_offset(&item->key) > root->highest_inode)
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break;
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if (btrfs_disk_key_type(&item->key) != key_type)
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continue;
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if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
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@ -1119,7 +1116,6 @@ allocate:
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out:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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printk("mapping iblock %lu to %lu\n", iblock, result->b_blocknr);
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if (trans)
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btrfs_end_transaction(trans, root);
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return err;
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@ -1233,7 +1229,6 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
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struct file *file,
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struct page **pages,
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size_t num_pages,
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u64 extent_offset,
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loff_t pos,
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size_t write_bytes)
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{
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@ -1253,7 +1248,6 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
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trans = btrfs_start_transaction(root, 1);
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btrfs_csum_file_block(trans, root, inode->i_ino,
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pages[i]->index << PAGE_CACHE_SHIFT,
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extent_offset,
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kmap(pages[i]), PAGE_CACHE_SIZE);
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kunmap(pages[i]);
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SetPageChecked(pages[i]);
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@ -1275,86 +1269,6 @@ failed:
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return err;
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}
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static int drop_csums(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *inode,
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u64 start, u64 end)
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{
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struct btrfs_path *path;
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struct btrfs_leaf *leaf;
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struct btrfs_key key;
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int slot;
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struct btrfs_csum_item *item;
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char *old_block = NULL;
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u64 cur = start;
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u64 found_end;
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u64 num_csums;
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u64 item_size;
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int ret;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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while(cur < end) {
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item = btrfs_lookup_csum(trans, root, path,
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inode->i_ino, cur, 1);
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if (IS_ERR(item)) {
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cur += root->blocksize;
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continue;
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}
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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slot = path->slots[0];
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btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
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item_size = btrfs_item_size(leaf->items + slot);
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num_csums = item_size / sizeof(struct btrfs_csum_item);
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found_end = key.offset + (num_csums << inode->i_blkbits);
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cur = found_end;
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if (found_end > end) {
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char *src;
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old_block = kmalloc(root->blocksize, GFP_NOFS);
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src = btrfs_item_ptr(leaf, slot, char);
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memcpy(old_block, src, item_size);
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}
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if (key.offset < start) {
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u64 new_size = (start - key.offset) >>
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inode->i_blkbits;
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new_size *= sizeof(struct btrfs_csum_item);
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ret = btrfs_truncate_item(trans, root, path, new_size);
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BUG_ON(ret);
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} else {
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btrfs_del_item(trans, root, path);
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}
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btrfs_release_path(root, path);
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if (found_end > end) {
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char *dst;
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int i;
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int new_size;
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num_csums = (found_end - end) >> inode->i_blkbits;
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new_size = num_csums * sizeof(struct btrfs_csum_item);
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key.offset = end;
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ret = btrfs_insert_empty_item(trans, root, path,
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&key, new_size);
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BUG_ON(ret);
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dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
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path->slots[0], char);
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memcpy(dst, old_block + item_size - new_size,
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new_size);
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item = (struct btrfs_csum_item *)dst;
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for (i = 0; i < num_csums; i++) {
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btrfs_set_csum_extent_offset(item, end);
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item++;
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}
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mark_buffer_dirty(path->nodes[0]);
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kfree(old_block);
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break;
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}
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}
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btrfs_free_path(path);
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return 0;
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}
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static int drop_extents(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *inode,
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@ -1376,12 +1290,16 @@ static int drop_extents(struct btrfs_trans_handle *trans,
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if (!path)
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return -ENOMEM;
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search_again:
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printk("drop extent inode %lu start %Lu end %Lu\n", inode->i_ino, start, end);
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ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
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search_start, -1);
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if (ret != 0) {
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printk("lookup failed\n");
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if (ret < 0)
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goto out;
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if (ret > 0) {
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if (path->slots[0] == 0) {
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ret = -ENOENT;
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goto out;
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}
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path->slots[0]--;
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}
|
||||
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);
|
||||
|
||||
|
|
Loading…
Reference in a new issue