#define BTRFS_BAD_LEVEL (-3)
#define BTRFS_BAD_NRITEMS (-4)
-#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
-
/* Calculate max possible nritems for a leaf/node */
static u32 max_nritems(u8 level, u32 nodesize)
{
sizeof(struct btrfs_key_ptr));
}
-static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
+static int check_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf)
{
struct btrfs_fs_devices *fs_devices;
+ u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
int ret = BTRFS_BAD_FSID;
if (buf->start != btrfs_header_bytenr(buf))
if (btrfs_header_level(buf) >= BTRFS_MAX_LEVEL)
return BTRFS_BAD_LEVEL;
if (btrfs_header_nritems(buf) > max_nritems(btrfs_header_level(buf),
- root->nodesize))
+ 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 = root->fs_info->fs_devices;
+ fs_devices = fs_info->fs_devices;
while (fs_devices) {
- if (root->fs_info->ignore_fsid_mismatch ||
+ if (fs_info->ignore_fsid_mismatch ||
!memcmp_extent_buffer(buf, fs_devices->fsid,
btrfs_header_fsid(),
BTRFS_FSID_SIZE)) {
return ret;
}
-static void print_tree_block_error(struct btrfs_root *root,
+static void print_tree_block_error(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb,
int err)
{
read_extent_buffer(eb, buf, btrfs_header_fsid(),
BTRFS_UUID_SIZE);
uuid_unparse(buf, found_uuid);
- uuid_unparse(root->fs_info->fsid, fs_uuid);
+ uuid_unparse(fs_info->fsid, fs_uuid);
fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
fs_uuid, found_uuid);
break;
}
}
-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;
+ u8 result[BTRFS_CSUM_SIZE];
u32 len;
u32 crc = ~(u32)0;
- result = malloc(csum_size * sizeof(char));
- if (!result)
- return 1;
-
len = buf->len - BTRFS_CSUM_SIZE;
crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
btrfs_csum_final(crc, result);
(unsigned long long)buf->start,
*((u32 *)result),
*((u32*)(char *)buf->data));
- free(result);
return 1;
}
} else {
write_extent_buffer(buf, result, 0, csum_size);
}
- free(result);
return 0;
}
return __csum_tree_block_size(buf, csum_size, 1, 1);
}
-int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
- int verify)
+static int csum_tree_block_fs_info(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf, int verify)
{
u16 csum_size =
- btrfs_super_csum_size(root->fs_info->super_copy);
- if (verify && root->fs_info->suppress_check_block_errors)
+ btrfs_super_csum_size(fs_info->super_copy);
+ if (verify && fs_info->suppress_check_block_errors)
return verify_tree_block_csum_silent(buf, csum_size);
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,
u64 bytenr, u32 blocksize)
{
bytenr, blocksize);
}
-struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
- u64 bytenr, u32 blocksize)
+struct extent_buffer* btrfs_find_create_tree_block(
+ struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize)
{
- return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
- blocksize);
+ return alloc_extent_buffer(&fs_info->extent_cache, bytenr, blocksize);
}
void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
bytenr, &length, &multi, 0, NULL)) {
device = multi->stripes[0].dev;
device->total_ios++;
- blocksize = min(blocksize, (u32)(64 * 1024));
+ blocksize = min(blocksize, (u32)SZ_64K);
readahead(device->fd, multi->stripes[0].physical, blocksize);
}
ret = 1;
out:
- clear_extent_buffer_uptodate(io_tree, eb);
+ clear_extent_buffer_uptodate(eb);
return ret;
}
return 0;
}
-struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
- u32 blocksize, u64 parent_transid)
+struct extent_buffer* read_tree_block_fs_info(
+ struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
+ u64 parent_transid)
{
int ret;
struct extent_buffer *eb;
u64 best_transid = 0;
+ u32 sectorsize = btrfs_super_sectorsize(fs_info->super_copy);
+ u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
int mirror_num = 0;
int good_mirror = 0;
int num_copies;
int ignore = 0;
- eb = btrfs_find_create_tree_block(root, 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);
+ }
+ if (blocksize < nodesize || !IS_ALIGNED(blocksize, nodesize)) {
+ error("tree block size %u is not aligned to nodesize %u",
+ blocksize, nodesize);
+ return ERR_PTR(-EIO);
+ }
+
+ eb = btrfs_find_create_tree_block(fs_info, bytenr, blocksize);
if (!eb)
return ERR_PTR(-ENOMEM);
return eb;
while (1) {
- ret = read_whole_eb(root->fs_info, eb, mirror_num);
- if (ret == 0 && csum_tree_block(root, eb, 1) == 0 &&
- check_tree_block(root, eb) == 0 &&
+ ret = read_whole_eb(fs_info, eb, mirror_num);
+ if (ret == 0 && csum_tree_block_fs_info(fs_info, eb, 1) == 0 &&
+ check_tree_block(fs_info, eb) == 0 &&
verify_parent_transid(eb->tree, eb, parent_transid, ignore)
== 0) {
if (eb->flags & EXTENT_BAD_TRANSID &&
list_empty(&eb->recow)) {
list_add_tail(&eb->recow,
- &root->fs_info->recow_ebs);
+ &fs_info->recow_ebs);
eb->refs++;
}
btrfs_set_buffer_uptodate(eb);
return eb;
}
if (ignore) {
- if (check_tree_block(root, eb)) {
- if (!root->fs_info->suppress_check_block_errors)
- print_tree_block_error(root, eb,
- check_tree_block(root, eb));
+ if (check_tree_block(fs_info, eb)) {
+ if (!fs_info->suppress_check_block_errors)
+ print_tree_block_error(fs_info, eb,
+ check_tree_block(fs_info, eb));
} else {
- if (!root->fs_info->suppress_check_block_errors)
+ if (!fs_info->suppress_check_block_errors)
fprintf(stderr, "Csum didn't match\n");
}
ret = -EIO;
break;
}
- num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
+ num_copies = btrfs_num_copies(&fs_info->mapping_tree,
eb->start, eb->len);
if (num_copies == 1) {
ignore = 1;
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_root *root, struct extent_buffer *eb)
{
int ret;
int dev_nr;
struct btrfs_root *root,
struct extent_buffer *eb)
{
- if (check_tree_block(root, eb)) {
- print_tree_block_error(root, eb, check_tree_block(root, eb));
+ if (check_tree_block(root->fs_info, eb)) {
+ print_tree_block_error(root->fs_info, eb,
+ check_tree_block(root->fs_info, eb));
BUG();
}
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
csum_tree_block(root, eb, 0);
- return write_and_map_eb(trans, root, eb);
+ return write_and_map_eb(root, eb);
}
-int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
+void btrfs_setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
u32 stripesize, struct btrfs_root *root,
struct btrfs_fs_info *fs_info, u64 objectid)
{
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,
write_ctree_super(trans, root);
btrfs_finish_extent_commit(trans, fs_info->extent_root,
&fs_info->pinned_extents);
- btrfs_free_transaction(root, trans);
+ kfree(trans);
free_extent_buffer(root->commit_root);
root->commit_root = NULL;
fs_info->running_transaction = NULL;
u32 blocksize;
u64 generation;
- __setup_root(tree_root->nodesize, tree_root->leafsize,
+ btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
root, fs_info, objectid);
ret = btrfs_find_last_root(tree_root, objectid,
if (ret)
return ret;
- blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
+ blocksize = root->nodesize;
generation = btrfs_root_generation(&root->root_item);
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
blocksize, generation);
return 0;
}
- blocksize = btrfs_level_size(tree_root,
- btrfs_super_log_root_level(disk_super));
+ blocksize = tree_root->nodesize;
- __setup_root(tree_root->nodesize, tree_root->leafsize,
+ btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
goto insert;
}
- __setup_root(tree_root->nodesize, tree_root->leafsize,
+ btrfs_setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
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 = btrfs_level_size(root, btrfs_root_level(&root->root_item));
+ blocksize = root->nodesize;
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
blocksize, generation);
if (!extent_buffer_uptodate(root->node)) {
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);
free(fs_info);
fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
if (!fs_info->tree_root || !fs_info->extent_root ||
!fs_info->chunk_root || !fs_info->dev_root ||
!fs_info->csum_root || !fs_info->quota_root ||
- !fs_info->super_copy)
+ !fs_info->free_space_root || !fs_info->super_copy)
goto free_all;
extent_io_tree_init(&fs_info->extent_cache);
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 leafsize = btrfs_super_leafsize(sb);
+ 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(info_root, 0, leafsize);
+ btrfs_find_create_tree_block(fs_info, 0, nodesize);
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;
stripesize = btrfs_super_stripesize(sb);
root = fs_info->tree_root;
- __setup_root(nodesize, leafsize, sectorsize, stripesize,
+ btrfs_setup_root(nodesize, leafsize, sectorsize, stripesize,
root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
- blocksize = btrfs_level_size(root, btrfs_super_root_level(sb));
+ blocksize = root->nodesize;
generation = btrfs_super_generation(sb);
if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
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, FREE_SPACE_TREE)) {
+ ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
+ fs_info->free_space_root);
+ if (ret) {
+ printk("Couldn't read free space tree\n");
+ return -EIO;
+ }
+ fs_info->free_space_root->track_dirty = 1;
+ }
ret = find_and_setup_log_root(root, fs_info, sb);
if (ret) {
void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
{
+ if (fs_info->free_space_root)
+ free_extent_buffer(fs_info->free_space_root->node);
if (fs_info->quota_root)
free_extent_buffer(fs_info->quota_root->node);
if (fs_info->csum_root)
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;
}
return 0;
}
-int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info)
+int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
+ u64 chunk_root_bytenr)
{
struct btrfs_super_block *sb = fs_info->super_copy;
u32 sectorsize;
sectorsize = btrfs_super_sectorsize(sb);
stripesize = btrfs_super_stripesize(sb);
- __setup_root(nodesize, leafsize, sectorsize, stripesize,
+ btrfs_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);
if (ret)
return ret;
- blocksize = btrfs_level_size(fs_info->chunk_root,
- btrfs_super_chunk_root_level(sb));
+ 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))) {
+ warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
+ chunk_root_bytenr, btrfs_super_sectorsize(sb));
+ chunk_root_bytenr = 0;
+ }
+
+ if (!chunk_root_bytenr)
+ chunk_root_bytenr = btrfs_super_chunk_root(sb);
+ else
+ generation = 0;
+
fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
- btrfs_super_chunk_root(sb),
+ chunk_root_bytenr,
blocksize, generation);
if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
- fprintf(stderr, "Couldn't read chunk root\n");
- return -EIO;
+ if (fs_info->ignore_chunk_tree_error) {
+ warning("cannot read chunk root, continue anyway");
+ fs_info->chunk_root = NULL;
+ return 0;
+ } else {
+ error("cannot read chunk root");
+ return -EIO;
+ }
}
if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
u64 sb_bytenr,
u64 root_tree_bytenr,
- enum btrfs_open_ctree_flags flags)
+ u64 chunk_root_bytenr,
+ 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;
fs_info->suppress_check_block_errors = 1;
if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
fs_info->ignore_fsid_mismatch = 1;
+ if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
+ fs_info->ignore_chunk_tree_error = 1;
+
+ if ((flags & OPEN_CTREE_RECOVER_SUPER)
+ && (flags & OPEN_CTREE_FS_PARTIAL)) {
+ fprintf(stderr,
+ "cannot open a partially created filesystem for recovery");
+ goto out;
+ }
- 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_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;
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);
+ if (flags & OPEN_CTREE_RECOVER_SUPER)
+ 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);
- 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;
- ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
+ ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
if (ret)
goto out_chunk;
+ /* Chunk tree root is unable to read, return directly */
+ if (!fs_info->chunk_root)
+ return fs_info;
+
eb = fs_info->chunk_root->node;
read_extent_buffer(eb, fs_info->chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(eb),
BTRFS_UUID_SIZE);
ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
- if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT))
+ if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
+ !fs_info->ignore_chunk_tree_error)
goto out_chunk;
return fs_info;
struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
u64 sb_bytenr, u64 root_tree_bytenr,
- enum btrfs_open_ctree_flags flags)
+ u64 chunk_root_bytenr,
+ 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));
+ return NULL;
+ }
+ if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
+ error("not a regular file or block device: %s", filename);
+ return NULL;
+ }
if (!(flags & OPEN_CTREE_WRITES))
oflags = O_RDONLY;
- fp = open(filename, oflags, 0600);
+ fp = open(filename, oflags);
if (fp < 0) {
- fprintf (stderr, "Could not open %s\n", filename);
+ error("cannot open '%s': %s", filename, strerror(errno));
return NULL;
}
info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
- flags);
+ chunk_root_bytenr, flags);
close(fp);
return info;
}
struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
- enum btrfs_open_ctree_flags flags)
+ unsigned flags)
{
struct btrfs_fs_info *info;
- info = open_ctree_fs_info(filename, sb_bytenr, 0, flags);
+ /* This flags may not return fs_info with any valid root */
+ BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
+ info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
if (!info)
return NULL;
if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
}
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;
- info = __open_ctree_fd(fp, path, sb_bytenr, 0, flags);
+
+ /* This flags may not return fs_info with any valid root */
+ 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;
if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
* - 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);
- return -EIO;
+ 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);
- return -EIO;
+ 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);
- return -EIO;
+ goto error_out;
}
if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
- fprintf(stderr, "ERROR: tree_root block unaligned: %llu\n",
- btrfs_super_root(sb));
- return -EIO;
+ 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));
- return -EIO;
+ 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));
- return -EIO;
+ 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));
- return -EIO;
+ goto error_out;
}
if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
- fprintf(stderr, "ERROR: nodesize unaligned: %u\n",
- btrfs_super_nodesize(sb));
- return -EIO;
+ 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));
- return -EIO;
+ goto error_out;
}
if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
- fprintf(stderr, "ERROR: sectorsize unaligned: %u\n",
- btrfs_super_sectorsize(sb));
- return -EIO;
+ error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
+ goto error_out;
+ }
+ if (btrfs_super_total_bytes(sb) == 0) {
+ error("invalid total_bytes 0");
+ goto error_out;
+ }
+ if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
+ error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
+ goto error_out;
+ }
+ 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;
}
if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
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);
- return -EIO;
+ 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");
- return -EIO;
+ 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);
- return -EIO;
+ 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));
- return -EIO;
+ 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 0;
+
+error_out:
+ error("superblock checksum matches but it has invalid members");
+ return -EIO;
}
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) {
if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
btrfs_set_super_bytenr(sb, root->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
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
return ret;
}
-int close_ctree(struct btrfs_root *root)
+int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
{
int ret;
struct btrfs_trans_handle *trans;
- struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_root *root = fs_info->tree_root;
if (fs_info->last_trans_committed !=
fs_info->generation) {
+ BUG_ON(!root);
trans = btrfs_start_transaction(root, 1);
btrfs_commit_transaction(trans, root);
trans = btrfs_start_transaction(root, 1);
ret = __commit_transaction(trans, root);
BUG_ON(ret);
write_ctree_super(trans, root);
- btrfs_free_transaction(root, trans);
+ 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(root);
+ if (ret)
+ fprintf(stderr,
+ "failed to write new super block err %d\n", ret);
}
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;
+ return ret;
}
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