{
struct btrfs_fs_devices *fs_devices;
- u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
+ u32 nodesize = fs_info->nodesize;
int ret = BTRFS_BAD_FSID;
if (buf->start != btrfs_header_bytenr(buf))
nodesize))
return BTRFS_BAD_NRITEMS;
+ /* Only leaf can be empty */
+ if (btrfs_header_nritems(buf) == 0 &&
+ btrfs_header_level(buf) != 0)
+ return BTRFS_BAD_NRITEMS;
+
fs_devices = fs_info->fs_devices;
while (fs_devices) {
if (fs_info->ignore_fsid_mismatch ||
}
}
-u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
+u32 btrfs_csum_data(char *data, u32 seed, size_t len)
{
return crc32c(seed, data, len);
}
-void btrfs_csum_final(u32 crc, char *result)
+void btrfs_csum_final(u32 crc, u8 *result)
{
- *(__le32 *)result = ~cpu_to_le32(crc);
+ put_unaligned_le32(~crc, result);
}
static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
int verify, int silent)
{
- char result[BTRFS_CSUM_SIZE];
+ u8 result[BTRFS_CSUM_SIZE];
u32 len;
u32 crc = ~(u32)0;
return __csum_tree_block_size(buf, csum_size, 1, 1);
}
-static int csum_tree_block_fs_info(struct btrfs_fs_info *fs_info,
- struct extent_buffer *buf, int verify)
+int csum_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf, int verify)
{
u16 csum_size =
btrfs_super_csum_size(fs_info->super_copy);
return csum_tree_block_size(buf, csum_size, verify);
}
-int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
- int verify)
-{
- return csum_tree_block_fs_info(root->fs_info, buf, verify);
-}
-
-struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
+struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
u64 bytenr, u32 blocksize)
{
- return find_extent_buffer(&root->fs_info->extent_cache,
+ return find_extent_buffer(&fs_info->extent_cache,
bytenr, blocksize);
}
struct extent_buffer* btrfs_find_create_tree_block(
- struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize)
+ struct btrfs_fs_info *fs_info, u64 bytenr)
{
- return alloc_extent_buffer(&fs_info->extent_cache, bytenr, blocksize);
+ return alloc_extent_buffer(&fs_info->extent_cache, bytenr,
+ fs_info->nodesize);
}
-void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
- u64 parent_transid)
+void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 parent_transid)
{
struct extent_buffer *eb;
u64 length;
struct btrfs_multi_bio *multi = NULL;
struct btrfs_device *device;
- eb = btrfs_find_tree_block(root, bytenr, blocksize);
+ eb = btrfs_find_tree_block(fs_info, bytenr, fs_info->nodesize);
if (!(eb && btrfs_buffer_uptodate(eb, parent_transid)) &&
- !btrfs_map_block(&root->fs_info->mapping_tree, READ,
- bytenr, &length, &multi, 0, NULL)) {
+ !btrfs_map_block(fs_info, READ, bytenr, &length, &multi, 0,
+ NULL)) {
device = multi->stripes[0].dev;
device->total_ios++;
- blocksize = min(blocksize, (u32)(64 * 1024));
- readahead(device->fd, multi->stripes[0].physical, blocksize);
+ readahead(device->fd, multi->stripes[0].physical,
+ fs_info->nodesize);
}
free_extent_buffer(eb);
ret = 1;
out:
- clear_extent_buffer_uptodate(io_tree, eb);
+ clear_extent_buffer_uptodate(eb);
return ret;
}
if (!info->on_restoring &&
eb->start != BTRFS_SUPER_INFO_OFFSET) {
- ret = btrfs_map_block(&info->mapping_tree, READ,
- eb->start + offset, &read_len, &multi,
- mirror, NULL);
+ ret = btrfs_map_block(info, READ, eb->start + offset,
+ &read_len, &multi, mirror, NULL);
if (ret) {
printk("Couldn't map the block %Lu\n", eb->start + offset);
kfree(multi);
return 0;
}
-struct extent_buffer* read_tree_block_fs_info(
- struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
+struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
u64 parent_transid)
{
int ret;
struct extent_buffer *eb;
u64 best_transid = 0;
+ u32 sectorsize = fs_info->sectorsize;
int mirror_num = 0;
int good_mirror = 0;
int num_copies;
int ignore = 0;
- eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
+ /*
+ * Don't even try to create tree block for unaligned tree block
+ * bytenr.
+ * Such unaligned tree block will free overlapping extent buffer,
+ * causing use-after-free bugs for fuzzed images.
+ */
+ if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
+ error("tree block bytenr %llu is not aligned to sectorsize %u",
+ bytenr, sectorsize);
+ return ERR_PTR(-EIO);
+ }
+
+ eb = btrfs_find_create_tree_block(fs_info, bytenr);
if (!eb)
return ERR_PTR(-ENOMEM);
while (1) {
ret = read_whole_eb(fs_info, eb, mirror_num);
- if (ret == 0 && csum_tree_block_fs_info(fs_info, eb, 1) == 0 &&
+ if (ret == 0 && csum_tree_block(fs_info, eb, 1) == 0 &&
check_tree_block(fs_info, eb) == 0 &&
verify_parent_transid(eb->tree, eb, parent_transid, ignore)
== 0) {
ret = -EIO;
break;
}
- num_copies = btrfs_num_copies(&fs_info->mapping_tree,
- eb->start, eb->len);
+ num_copies = btrfs_num_copies(fs_info, eb->start, eb->len);
if (num_copies == 1) {
ignore = 1;
continue;
return ERR_PTR(ret);
}
-int read_extent_data(struct btrfs_root *root, char *data,
- u64 logical, u64 *len, int mirror)
+int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
+ u64 *len, int mirror)
{
u64 offset = 0;
struct btrfs_multi_bio *multi = NULL;
- struct btrfs_fs_info *info = root->fs_info;
struct btrfs_device *device;
int ret = 0;
u64 max_len = *len;
- ret = btrfs_map_block(&info->mapping_tree, READ, logical, len,
- &multi, mirror, NULL);
+ ret = btrfs_map_block(fs_info, READ, logical, len, &multi, mirror,
+ NULL);
if (ret) {
fprintf(stderr, "Couldn't map the block %llu\n",
logical + offset);
}
device = multi->stripes[0].dev;
- if (device->fd <= 0)
- goto err;
if (*len > max_len)
*len = max_len;
+ if (device->fd < 0) {
+ ret = -EIO;
+ goto err;
+ }
ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
if (ret != *len)
return ret;
}
-int write_and_map_eb(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct extent_buffer *eb)
+int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
{
int ret;
int dev_nr;
dev_nr = 0;
length = eb->len;
- ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
- eb->start, &length, &multi, 0, &raid_map);
+ ret = btrfs_map_block(fs_info, WRITE, eb->start, &length,
+ &multi, 0, &raid_map);
if (raid_map) {
- ret = write_raid56_with_parity(root->fs_info, eb, multi,
+ ret = write_raid56_with_parity(fs_info, eb, multi,
length, raid_map);
BUG_ON(ret);
} else while (dev_nr < multi->num_stripes) {
}
int write_tree_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
+ struct btrfs_fs_info *fs_info,
struct extent_buffer *eb)
{
- if (check_tree_block(root->fs_info, eb)) {
- print_tree_block_error(root->fs_info, eb,
- check_tree_block(root->fs_info, eb));
+ if (check_tree_block(fs_info, eb)) {
+ print_tree_block_error(fs_info, eb,
+ check_tree_block(fs_info, eb));
BUG();
}
BUG();
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
- csum_tree_block(root, eb, 0);
+ csum_tree_block(fs_info, eb, 0);
- return write_and_map_eb(trans, root, eb);
+ return write_and_map_eb(fs_info, eb);
}
-int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
- u32 stripesize, struct btrfs_root *root,
- struct btrfs_fs_info *fs_info, u64 objectid)
+void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
+ u64 objectid)
{
root->node = NULL;
root->commit_root = NULL;
- root->sectorsize = sectorsize;
- root->nodesize = nodesize;
- root->leafsize = leafsize;
- root->stripesize = stripesize;
root->ref_cows = 0;
root->track_dirty = 0;
root->fs_info = fs_info;
root->objectid = objectid;
root->last_trans = 0;
- root->highest_inode = 0;
root->last_inode_alloc = 0;
INIT_LIST_HEAD(&root->dirty_list);
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
root->root_key.objectid = objectid;
- return 0;
-}
-
-static int update_cowonly_root(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
-{
- int ret;
- u64 old_root_bytenr;
- struct btrfs_root *tree_root = root->fs_info->tree_root;
-
- btrfs_write_dirty_block_groups(trans, root);
- while(1) {
- old_root_bytenr = btrfs_root_bytenr(&root->root_item);
- if (old_root_bytenr == root->node->start)
- break;
- btrfs_set_root_bytenr(&root->root_item,
- root->node->start);
- btrfs_set_root_generation(&root->root_item,
- trans->transid);
- root->root_item.level = btrfs_header_level(root->node);
- ret = btrfs_update_root(trans, tree_root,
- &root->root_key,
- &root->root_item);
- BUG_ON(ret);
- btrfs_write_dirty_block_groups(trans, root);
- }
- return 0;
-}
-
-static int commit_tree_roots(struct btrfs_trans_handle *trans,
- struct btrfs_fs_info *fs_info)
-{
- struct btrfs_root *root;
- struct list_head *next;
- struct extent_buffer *eb;
- int ret;
-
- if (fs_info->readonly)
- return 0;
-
- eb = fs_info->tree_root->node;
- extent_buffer_get(eb);
- ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
- free_extent_buffer(eb);
- if (ret)
- return ret;
-
- while(!list_empty(&fs_info->dirty_cowonly_roots)) {
- next = fs_info->dirty_cowonly_roots.next;
- list_del_init(next);
- root = list_entry(next, struct btrfs_root, dirty_list);
- update_cowonly_root(trans, root);
- free_extent_buffer(root->commit_root);
- root->commit_root = NULL;
- }
-
- return 0;
-}
-
-static int __commit_transaction(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
-{
- u64 start;
- u64 end;
- struct extent_buffer *eb;
- struct extent_io_tree *tree = &root->fs_info->extent_cache;
- int ret;
-
- while(1) {
- ret = find_first_extent_bit(tree, 0, &start, &end,
- EXTENT_DIRTY);
- if (ret)
- break;
- while(start <= end) {
- eb = find_first_extent_buffer(tree, start);
- BUG_ON(!eb || eb->start != start);
- ret = write_tree_block(trans, root, eb);
- BUG_ON(ret);
- start += eb->len;
- clear_extent_buffer_dirty(eb);
- free_extent_buffer(eb);
- }
- }
- return 0;
-}
-
-int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
-{
- u64 transid = trans->transid;
- int ret = 0;
- struct btrfs_fs_info *fs_info = root->fs_info;
-
- if (root->commit_root == root->node)
- goto commit_tree;
- if (root == root->fs_info->tree_root)
- goto commit_tree;
- if (root == root->fs_info->chunk_root)
- goto commit_tree;
-
- free_extent_buffer(root->commit_root);
- root->commit_root = NULL;
-
- btrfs_set_root_bytenr(&root->root_item, root->node->start);
- btrfs_set_root_generation(&root->root_item, trans->transid);
- root->root_item.level = btrfs_header_level(root->node);
- ret = btrfs_update_root(trans, root->fs_info->tree_root,
- &root->root_key, &root->root_item);
- BUG_ON(ret);
-commit_tree:
- ret = commit_tree_roots(trans, fs_info);
- BUG_ON(ret);
- ret = __commit_transaction(trans, root);
- BUG_ON(ret);
- write_ctree_super(trans, root);
- btrfs_finish_extent_commit(trans, fs_info->extent_root,
- &fs_info->pinned_extents);
- btrfs_free_transaction(root, trans);
- free_extent_buffer(root->commit_root);
- root->commit_root = NULL;
- fs_info->running_transaction = NULL;
- fs_info->last_trans_committed = transid;
- return 0;
}
static int find_and_setup_root(struct btrfs_root *tree_root,
u64 objectid, struct btrfs_root *root)
{
int ret;
- u32 blocksize;
u64 generation;
- __setup_root(tree_root->nodesize, tree_root->leafsize,
- tree_root->sectorsize, tree_root->stripesize,
- root, fs_info, objectid);
+ btrfs_setup_root(root, fs_info, objectid);
ret = btrfs_find_last_root(tree_root, objectid,
&root->root_item, &root->root_key);
if (ret)
return ret;
- blocksize = root->nodesize;
generation = btrfs_root_generation(&root->root_item);
- root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
- blocksize, generation);
+ root->node = read_tree_block(fs_info,
+ btrfs_root_bytenr(&root->root_item), generation);
if (!extent_buffer_uptodate(root->node))
return -EIO;
struct btrfs_fs_info *fs_info,
struct btrfs_super_block *disk_super)
{
- u32 blocksize;
u64 blocknr = btrfs_super_log_root(disk_super);
struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
return 0;
}
- blocksize = tree_root->nodesize;
+ btrfs_setup_root(log_root, fs_info,
+ BTRFS_TREE_LOG_OBJECTID);
- __setup_root(tree_root->nodesize, tree_root->leafsize,
- tree_root->sectorsize, tree_root->stripesize,
- log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
-
- log_root->node = read_tree_block(tree_root, blocknr,
- blocksize,
+ log_root->node = read_tree_block(fs_info, blocknr,
btrfs_super_generation(disk_super) + 1);
fs_info->log_root_tree = log_root;
struct btrfs_path *path;
struct extent_buffer *l;
u64 generation;
- u32 blocksize;
int ret = 0;
root = calloc(1, sizeof(*root));
goto insert;
}
- __setup_root(tree_root->nodesize, tree_root->leafsize,
- tree_root->sectorsize, tree_root->stripesize,
- root, fs_info, location->objectid);
+ btrfs_setup_root(root, fs_info,
+ location->objectid);
path = btrfs_alloc_path();
- BUG_ON(!path);
+ if (!path) {
+ free(root);
+ return ERR_PTR(-ENOMEM);
+ }
+
ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
if (ret != 0) {
if (ret > 0)
return ERR_PTR(ret);
}
generation = btrfs_root_generation(&root->root_item);
- blocksize = root->nodesize;
- root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
- blocksize, generation);
+ root->node = read_tree_block(fs_info,
+ btrfs_root_bytenr(&root->root_item), generation);
if (!extent_buffer_uptodate(root->node)) {
free(root);
return ERR_PTR(-EIO);
if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
return fs_info->csum_root;
if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
- return fs_info->quota_root;
+ return fs_info->quota_enabled ? fs_info->quota_root :
+ ERR_PTR(-ENOENT);
BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
location->offset != (u64)-1);
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
{
+ if (fs_info->quota_root)
+ free(fs_info->quota_root);
+
free(fs_info->tree_root);
free(fs_info->extent_root);
free(fs_info->chunk_root);
free(fs_info->dev_root);
free(fs_info->csum_root);
- free(fs_info->quota_root);
free(fs_info->free_space_root);
free(fs_info->super_copy);
free(fs_info->log_root_tree);
return NULL;
}
-int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
+int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
+ unsigned int flags)
{
u64 features;
btrfs_set_super_incompat_flags(sb, features);
}
- features = btrfs_super_compat_ro_flags(sb) &
- ~BTRFS_FEATURE_COMPAT_RO_SUPP;
- if (writable && features) {
- printk("couldn't open RDWR because of unsupported "
- "option features (%Lx).\n",
- (unsigned long long)features);
- return -ENOTSUP;
+ features = btrfs_super_compat_ro_flags(sb);
+ if (flags & OPEN_CTREE_WRITES) {
+ if (flags & OPEN_CTREE_INVALIDATE_FST) {
+ /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
+ features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
+ btrfs_set_super_compat_ro_flags(sb, features);
+ /* ... and ignore the free space tree bit. */
+ features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
+ }
+ if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
+ printk("couldn't open RDWR because of unsupported "
+ "option features (%Lx).\n",
+ (unsigned long long)features);
+ return -ENOTSUP;
+ }
+
}
return 0;
}
}
static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
- enum btrfs_open_ctree_flags flags,
+ unsigned flags,
struct btrfs_root *info_root,
u64 objectid, char *str)
{
- struct btrfs_super_block *sb = fs_info->super_copy;
struct btrfs_root *root = fs_info->tree_root;
- u32 nodesize = btrfs_super_nodesize(sb);
int ret;
ret = find_and_setup_root(root, fs_info, objectid, info_root);
* million of places that assume a root has a valid ->node
*/
info_root->node =
- btrfs_find_create_tree_block(fs_info, 0, nodesize);
+ btrfs_find_create_tree_block(fs_info, 0);
if (!info_root->node)
return -ENOMEM;
- clear_extent_buffer_uptodate(NULL, info_root->node);
+ clear_extent_buffer_uptodate(info_root->node);
}
return 0;
}
int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
- enum btrfs_open_ctree_flags flags)
+ unsigned flags)
{
struct btrfs_super_block *sb = fs_info->super_copy;
struct btrfs_root *root;
struct btrfs_key key;
- u32 sectorsize;
- u32 nodesize;
- u32 leafsize;
- u32 stripesize;
u64 generation;
- u32 blocksize;
int ret;
- nodesize = btrfs_super_nodesize(sb);
- leafsize = btrfs_super_leafsize(sb);
- sectorsize = btrfs_super_sectorsize(sb);
- stripesize = btrfs_super_stripesize(sb);
-
root = fs_info->tree_root;
- __setup_root(nodesize, leafsize, sectorsize, stripesize,
- root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
- blocksize = root->nodesize;
+ btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
generation = btrfs_super_generation(sb);
if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
generation = btrfs_backup_tree_root_gen(backup);
}
- root->node = read_tree_block(root, root_tree_bytenr, blocksize,
- generation);
+ root->node = read_tree_block(fs_info, root_tree_bytenr, generation);
if (!extent_buffer_uptodate(root->node)) {
fprintf(stderr, "Couldn't read tree root\n");
return -EIO;
ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
fs_info->quota_root);
- if (ret == 0)
+ if (ret) {
+ free(fs_info->quota_root);
+ fs_info->quota_root = NULL;
+ } else {
fs_info->quota_enabled = 1;
+ }
- if (btrfs_fs_compat_ro(fs_info, BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE)) {
+ if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
fs_info->free_space_root);
if (ret) {
fs_info->generation = generation;
fs_info->last_trans_committed = generation;
if (extent_buffer_uptodate(fs_info->extent_root->node) &&
- !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
- btrfs_read_block_groups(fs_info->tree_root);
+ !(flags & OPEN_CTREE_NO_BLOCK_GROUPS)) {
+ ret = btrfs_read_block_groups(fs_info->tree_root);
+ /*
+ * If we don't find any blockgroups (ENOENT) we're either
+ * restoring or creating the filesystem, where it's expected,
+ * anything else is error
+ */
+ if (ret != -ENOENT)
+ return -EIO;
+ }
key.objectid = BTRFS_FS_TREE_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
int btrfs_scan_fs_devices(int fd, const char *path,
struct btrfs_fs_devices **fs_devices,
- u64 sb_bytenr, int super_recover,
+ u64 sb_bytenr, unsigned sbflags,
int skip_devices)
{
u64 total_devs;
dev_size = seek_ret;
lseek(fd, 0, SEEK_SET);
if (sb_bytenr > dev_size) {
- fprintf(stderr, "Superblock bytenr is larger than device size\n");
+ error("superblock bytenr %llu is larger than device size %llu",
+ (unsigned long long)sb_bytenr,
+ (unsigned long long)dev_size);
return -EINVAL;
}
ret = btrfs_scan_one_device(fd, path, fs_devices,
- &total_devs, sb_bytenr, super_recover);
+ &total_devs, sb_bytenr, sbflags);
if (ret) {
fprintf(stderr, "No valid Btrfs found on %s\n", path);
return ret;
}
if (!skip_devices && total_devs != 1) {
- ret = btrfs_scan_lblkid();
+ ret = btrfs_scan_devices();
if (ret)
return ret;
}
u64 chunk_root_bytenr)
{
struct btrfs_super_block *sb = fs_info->super_copy;
- u32 sectorsize;
- u32 nodesize;
- u32 leafsize;
- u32 blocksize;
- u32 stripesize;
u64 generation;
int ret;
- nodesize = btrfs_super_nodesize(sb);
- leafsize = btrfs_super_leafsize(sb);
- sectorsize = btrfs_super_sectorsize(sb);
- stripesize = btrfs_super_stripesize(sb);
+ btrfs_setup_root(fs_info->chunk_root, fs_info,
+ BTRFS_CHUNK_TREE_OBJECTID);
- __setup_root(nodesize, leafsize, sectorsize, stripesize,
- fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
-
- ret = btrfs_read_sys_array(fs_info->chunk_root);
+ ret = btrfs_read_sys_array(fs_info);
if (ret)
return ret;
- blocksize = fs_info->chunk_root->nodesize;
generation = btrfs_super_chunk_root_generation(sb);
if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
- btrfs_super_sectorsize(sb))) {
+ fs_info->sectorsize)) {
warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
- chunk_root_bytenr, btrfs_super_sectorsize(sb));
+ chunk_root_bytenr, fs_info->sectorsize);
chunk_root_bytenr = 0;
}
else
generation = 0;
- fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
+ fs_info->chunk_root->node = read_tree_block(fs_info,
chunk_root_bytenr,
- blocksize, generation);
+ generation);
if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
if (fs_info->ignore_chunk_tree_error) {
warning("cannot read chunk root, continue anyway");
}
if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
- ret = btrfs_read_chunk_tree(fs_info->chunk_root);
+ ret = btrfs_read_chunk_tree(fs_info);
if (ret) {
fprintf(stderr, "Couldn't read chunk tree\n");
return ret;
u64 sb_bytenr,
u64 root_tree_bytenr,
u64 chunk_root_bytenr,
- enum btrfs_open_ctree_flags flags)
+ unsigned flags)
{
struct btrfs_fs_info *fs_info;
struct btrfs_super_block *disk_super;
struct extent_buffer *eb;
int ret;
int oflags;
+ unsigned sbflags = SBREAD_DEFAULT;
if (sb_bytenr == 0)
sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
fs_info->ignore_chunk_tree_error = 1;
- ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr,
- (flags & OPEN_CTREE_RECOVER_SUPER),
- (flags & OPEN_CTREE_NO_DEVICES));
+ if ((flags & OPEN_CTREE_RECOVER_SUPER)
+ && (flags & OPEN_CTREE_FS_PARTIAL)) {
+ fprintf(stderr,
+ "cannot open a partially created filesystem for recovery");
+ goto out;
+ }
+
+ if (flags & OPEN_CTREE_FS_PARTIAL)
+ sbflags = SBREAD_PARTIAL;
+
+ ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
+ (flags & OPEN_CTREE_NO_DEVICES));
if (ret)
goto out;
disk_super = fs_info->super_copy;
if (flags & OPEN_CTREE_RECOVER_SUPER)
- ret = btrfs_read_dev_super(fs_devices->latest_bdev,
- disk_super, sb_bytenr, 1);
+ ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
+ sb_bytenr, SBREAD_RECOVER);
else
- ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr, 0);
+ ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
+ sbflags);
if (ret) {
printk("No valid btrfs found\n");
goto out_devices;
}
memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
+ fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
+ fs_info->nodesize = btrfs_super_nodesize(disk_super);
+ fs_info->stripesize = btrfs_super_stripesize(disk_super);
- ret = btrfs_check_fs_compatibility(fs_info->super_copy,
- flags & OPEN_CTREE_WRITES);
+ ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
if (ret)
goto out_devices;
struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
u64 sb_bytenr, u64 root_tree_bytenr,
u64 chunk_root_bytenr,
- enum btrfs_open_ctree_flags flags)
+ unsigned flags)
{
int fp;
int ret;
struct btrfs_fs_info *info;
- int oflags = O_CREAT | O_RDWR;
+ int oflags = O_RDWR;
struct stat st;
ret = stat(filename, &st);
if (ret < 0) {
- error("cannot stat '%s': %s", filename, strerror(errno));
+ error("cannot stat '%s': %m", filename);
return NULL;
}
if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
if (!(flags & OPEN_CTREE_WRITES))
oflags = O_RDONLY;
- fp = open(filename, oflags, 0600);
+ fp = open(filename, oflags);
if (fp < 0) {
- error("cannot open '%s': %s", filename, strerror(errno));
+ error("cannot open '%s': %m", filename);
return NULL;
}
info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
}
struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
- enum btrfs_open_ctree_flags flags)
+ unsigned flags)
{
struct btrfs_fs_info *info;
}
struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
- enum btrfs_open_ctree_flags flags)
+ unsigned flags)
{
struct btrfs_fs_info *info;
/* This flags may not return fs_info with any valid root */
- BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
+ if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
+ error("invalid open_ctree flags: 0x%llx",
+ (unsigned long long)flags);
+ return NULL;
+ }
info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
if (!info)
return NULL;
* - number of devices - something sane
* - sys array size - maximum
*/
-static int check_super(struct btrfs_super_block *sb)
+static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
{
- char result[BTRFS_CSUM_SIZE];
+ u8 result[BTRFS_CSUM_SIZE];
u32 crc;
u16 csum_type;
int csum_size;
if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
- fprintf(stderr, "ERROR: superblock magic doesn't match\n");
- return -EIO;
+ if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
+ if (!(sbflags & SBREAD_PARTIAL)) {
+ error("superblock magic doesn't match");
+ return -EIO;
+ }
+ }
}
csum_type = btrfs_super_csum_type(sb);
if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
- fprintf(stderr, "ERROR: unsupported checksum algorithm %u\n",
- csum_type);
+ error("unsupported checksum algorithm %u", csum_type);
return -EIO;
}
csum_size = btrfs_csum_sizes[csum_type];
crc = ~(u32)0;
- crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
+ crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, result);
if (memcmp(result, sb->csum, csum_size)) {
- fprintf(stderr, "ERROR: superblock checksum mismatch\n");
+ error("superblock checksum mismatch");
return -EIO;
}
if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
- fprintf(stderr, "ERROR: tree_root level too big: %d >= %d\n",
+ error("tree_root level too big: %d >= %d",
btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
goto error_out;
}
if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
- fprintf(stderr, "ERROR: chunk_root level too big: %d >= %d\n",
+ error("chunk_root level too big: %d >= %d",
btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
goto error_out;
}
if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
- fprintf(stderr, "ERROR: log_root level too big: %d >= %d\n",
+ error("log_root level too big: %d >= %d",
btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
goto error_out;
}
if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
- fprintf(stderr, "ERROR: tree_root block unaligned: %llu\n",
- btrfs_super_root(sb));
+ error("tree_root block unaligned: %llu", btrfs_super_root(sb));
goto error_out;
}
if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
- fprintf(stderr, "ERROR: chunk_root block unaligned: %llu\n",
+ error("chunk_root block unaligned: %llu",
btrfs_super_chunk_root(sb));
goto error_out;
}
if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
- fprintf(stderr, "ERROR: log_root block unaligned: %llu\n",
+ error("log_root block unaligned: %llu",
btrfs_super_log_root(sb));
goto error_out;
}
if (btrfs_super_nodesize(sb) < 4096) {
- fprintf(stderr, "ERROR: nodesize too small: %u < 4096\n",
+ error("nodesize too small: %u < 4096",
btrfs_super_nodesize(sb));
goto error_out;
}
if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
- fprintf(stderr, "ERROR: nodesize unaligned: %u\n",
- btrfs_super_nodesize(sb));
+ error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
goto error_out;
}
if (btrfs_super_sectorsize(sb) < 4096) {
- fprintf(stderr, "ERROR: sectorsize too small: %u < 4096\n",
+ error("sectorsize too small: %u < 4096",
btrfs_super_sectorsize(sb));
goto error_out;
}
if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
- fprintf(stderr, "ERROR: sectorsize unaligned: %u\n",
- btrfs_super_sectorsize(sb));
+ error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
goto error_out;
}
if (btrfs_super_total_bytes(sb) == 0) {
error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
goto error_out;
}
- if (btrfs_super_stripesize(sb) != 4096) {
+ if ((btrfs_super_stripesize(sb) != 4096)
+ && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
error("invalid stripesize %u", btrfs_super_stripesize(sb));
goto error_out;
}
uuid_unparse(sb->fsid, fsid);
uuid_unparse(sb->dev_item.fsid, dev_fsid);
- printk(KERN_ERR
- "ERROR: dev_item UUID does not match fsid: %s != %s\n",
+ error("dev_item UUID does not match fsid: %s != %s",
dev_fsid, fsid);
goto error_out;
}
* Hint to catch really bogus numbers, bitflips or so
*/
if (btrfs_super_num_devices(sb) > (1UL << 31)) {
- fprintf(stderr, "WARNING: suspicious number of devices: %llu\n",
+ warning("suspicious number of devices: %llu",
btrfs_super_num_devices(sb));
}
if (btrfs_super_num_devices(sb) == 0) {
- fprintf(stderr, "ERROR: number of devices is 0\n");
+ error("number of devices is 0");
goto error_out;
}
* and one chunk
*/
if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
- fprintf(stderr, "BTRFS: system chunk array too big %u > %u\n",
- btrfs_super_sys_array_size(sb),
- BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
+ error("system chunk array too big %u > %u",
+ btrfs_super_sys_array_size(sb),
+ BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
goto error_out;
}
if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
+ sizeof(struct btrfs_chunk)) {
- fprintf(stderr, "BTRFS: system chunk array too small %u < %lu\n",
- btrfs_super_sys_array_size(sb),
- sizeof(struct btrfs_disk_key) +
- sizeof(struct btrfs_chunk));
+ error("system chunk array too small %u < %zu",
+ btrfs_super_sys_array_size(sb),
+ sizeof(struct btrfs_disk_key) +
+ sizeof(struct btrfs_chunk));
goto error_out;
}
return -EIO;
}
+/*
+ * btrfs_read_dev_super - read a valid superblock from a block device
+ * @fd: file descriptor of the device
+ * @sb: buffer where the superblock is going to be read in
+ * @sb_bytenr: offset of the particular superblock copy we want
+ * @sbflags: flags controlling how the superblock is read
+ *
+ * This function is used by various btrfs comands to obtain a valid superblock.
+ *
+ * It's mode of operation is controlled by the @sb_bytenr and @sbdflags
+ * parameters. If SBREAD_RECOVER flag is set and @sb_bytenr is
+ * BTRFS_SUPER_INFO_OFFSET then the function reads all 3 superblock copies and
+ * returns the newest one. If SBREAD_RECOVER is not set then only a single
+ * copy is read, which one is decided by @sb_bytenr. If @sb_bytenr !=
+ * BTRFS_SUPER_INFO_OFFSET then the @sbflags is effectively ignored and only a
+ * single copy is read.
+ */
int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
- int super_recover)
+ unsigned sbflags)
{
u8 fsid[BTRFS_FSID_SIZE];
int fsid_is_initialized = 0;
struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
int i;
int ret;
- int max_super = super_recover ? BTRFS_SUPER_MIRROR_MAX : 1;
+ int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
u64 transid = 0;
u64 bytenr;
if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
+ /* real error */
+ if (ret < 0)
+ return -errno;
+
+ /* Not large enough sb, return -ENOENT instead of normal -EIO */
if (ret < BTRFS_SUPER_INFO_SIZE)
- return -1;
+ return -ENOENT;
if (btrfs_super_bytenr(buf) != sb_bytenr)
- return -1;
+ return -EIO;
- if (check_super(buf))
- return -1;
+ ret = check_super(buf, sbflags);
+ if (ret < 0)
+ return ret;
memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
return 0;
}
/* if magic is NULL, the device was removed */
if (btrfs_super_magic(buf) == 0 && i == 0)
break;
- if (check_super(buf))
+ if (check_super(buf, sbflags))
continue;
if (!fsid_is_initialized) {
return transid > 0 ? 0 : -1;
}
-static int write_dev_supers(struct btrfs_root *root,
+static int write_dev_supers(struct btrfs_fs_info *fs_info,
struct btrfs_super_block *sb,
struct btrfs_device *device)
{
u32 crc;
int i, ret;
- if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
- btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
+ if (fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
+ btrfs_set_super_bytenr(sb, fs_info->super_bytenr);
crc = ~(u32)0;
- crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
+ crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- btrfs_csum_final(crc, (char *)&sb->csum[0]);
+ btrfs_csum_final(crc, &sb->csum[0]);
/*
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
* zero filled, we can use it directly
*/
- ret = pwrite64(device->fd, root->fs_info->super_copy,
+ ret = pwrite64(device->fd, fs_info->super_copy,
BTRFS_SUPER_INFO_SIZE,
- root->fs_info->super_bytenr);
+ fs_info->super_bytenr);
if (ret != BTRFS_SUPER_INFO_SIZE)
goto write_err;
return 0;
btrfs_set_super_bytenr(sb, bytenr);
crc = ~(u32)0;
- crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
+ crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- btrfs_csum_final(crc, (char *)&sb->csum[0]);
+ btrfs_csum_final(crc, &sb->csum[0]);
/*
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
* zero filled, we can use it directly
*/
- ret = pwrite64(device->fd, root->fs_info->super_copy,
+ ret = pwrite64(device->fd, fs_info->super_copy,
BTRFS_SUPER_INFO_SIZE, bytenr);
if (ret != BTRFS_SUPER_INFO_SIZE)
goto write_err;
if (ret > 0)
fprintf(stderr, "WARNING: failed to write all sb data\n");
else
- fprintf(stderr, "WARNING: failed to write sb: %s\n",
- strerror(errno));
+ fprintf(stderr, "WARNING: failed to write sb: %m\n");
return ret;
}
-int write_all_supers(struct btrfs_root *root)
+int write_all_supers(struct btrfs_fs_info *fs_info)
{
- struct list_head *cur;
- struct list_head *head = &root->fs_info->fs_devices->devices;
+ struct list_head *head = &fs_info->fs_devices->devices;
struct btrfs_device *dev;
struct btrfs_super_block *sb;
struct btrfs_dev_item *dev_item;
int ret;
u64 flags;
- sb = root->fs_info->super_copy;
+ sb = fs_info->super_copy;
dev_item = &sb->dev_item;
- list_for_each(cur, head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(dev, head, dev_list) {
if (!dev->writeable)
continue;
flags = btrfs_super_flags(sb);
btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
- ret = write_dev_supers(root, sb, dev);
+ ret = write_dev_supers(fs_info, sb, dev);
BUG_ON(ret);
}
return 0;
}
int write_ctree_super(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+ struct btrfs_fs_info *fs_info)
{
int ret;
- struct btrfs_root *tree_root = root->fs_info->tree_root;
- struct btrfs_root *chunk_root = root->fs_info->chunk_root;
+ struct btrfs_root *tree_root = fs_info->tree_root;
+ struct btrfs_root *chunk_root = fs_info->chunk_root;
- if (root->fs_info->readonly)
+ if (fs_info->readonly)
return 0;
- btrfs_set_super_generation(root->fs_info->super_copy,
+ btrfs_set_super_generation(fs_info->super_copy,
trans->transid);
- btrfs_set_super_root(root->fs_info->super_copy,
+ btrfs_set_super_root(fs_info->super_copy,
tree_root->node->start);
- btrfs_set_super_root_level(root->fs_info->super_copy,
+ btrfs_set_super_root_level(fs_info->super_copy,
btrfs_header_level(tree_root->node));
- btrfs_set_super_chunk_root(root->fs_info->super_copy,
+ btrfs_set_super_chunk_root(fs_info->super_copy,
chunk_root->node->start);
- btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
+ btrfs_set_super_chunk_root_level(fs_info->super_copy,
btrfs_header_level(chunk_root->node));
- btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
+ btrfs_set_super_chunk_root_generation(fs_info->super_copy,
btrfs_header_generation(chunk_root->node));
- ret = write_all_supers(root);
+ ret = write_all_supers(fs_info);
if (ret)
fprintf(stderr, "failed to write new super block err %d\n", ret);
return ret;
int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
{
int ret;
+ int err = 0;
struct btrfs_trans_handle *trans;
struct btrfs_root *root = fs_info->tree_root;
fs_info->generation) {
BUG_ON(!root);
trans = btrfs_start_transaction(root, 1);
+ if (IS_ERR(trans)) {
+ err = PTR_ERR(trans);
+ goto skip_commit;
+ }
btrfs_commit_transaction(trans, root);
trans = btrfs_start_transaction(root, 1);
+ BUG_ON(IS_ERR(trans));
ret = commit_tree_roots(trans, fs_info);
BUG_ON(ret);
ret = __commit_transaction(trans, root);
BUG_ON(ret);
- write_ctree_super(trans, root);
- btrfs_free_transaction(root, trans);
+ write_ctree_super(trans, fs_info);
+ kfree(trans);
}
+
+ if (fs_info->finalize_on_close) {
+ btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
+ root->fs_info->finalize_on_close = 0;
+ ret = write_all_supers(fs_info);
+ if (ret)
+ fprintf(stderr,
+ "failed to write new super block err %d\n", ret);
+ }
+
+skip_commit:
btrfs_free_block_groups(fs_info);
free_fs_roots_tree(&fs_info->fs_root_tree);
btrfs_release_all_roots(fs_info);
- btrfs_close_devices(fs_info->fs_devices);
+ ret = btrfs_close_devices(fs_info->fs_devices);
btrfs_cleanup_all_caches(fs_info);
btrfs_free_fs_info(fs_info);
- return 0;
+ if (!err)
+ err = ret;
+ return err;
}
int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
return clear_extent_buffer_dirty(eb);
}
-int wait_on_tree_block_writeback(struct btrfs_root *root,
- struct extent_buffer *eb)
-{
- return 0;
-}
-
void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
{
set_extent_buffer_dirty(eb);
projects / platform / upstream / btrfs-progs.git / blobdiff