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;
- fs_devices = root->fs_info->fs_devices;
+ /* 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 (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;
void btrfs_csum_final(u32 crc, char *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;
+ char 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,
}
device = multi->stripes[0].dev;
- if (device->fd == 0) {
+ if (device->fd <= 0) {
kfree(multi);
return -EIO;
}
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;
int num_copies;
int ignore = 0;
- eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
+ 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;
}
device = multi->stripes[0].dev;
- if (device->fd == 0)
+ if (device->fd <= 0)
goto err;
if (*len > max_len)
*len = max_len;
ret = write_extent_to_disk(eb);
BUG_ON(ret);
}
+ kfree(raid_map);
kfree(multi);
return 0;
}
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();
}
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,
tree_root->sectorsize, tree_root->stripesize,
u32 blocksize;
int ret = 0;
- root = malloc(sizeof(*root));
+ root = calloc(1, sizeof(*root));
if (!root)
return ERR_PTR(-ENOMEM);
- memset(root, 0, sizeof(*root));
if (location->offset == (u64)-1) {
ret = find_and_setup_root(tree_root, fs_info,
location->objectid, root);
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)) {
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);
{
struct btrfs_fs_info *fs_info;
- fs_info = malloc(sizeof(struct btrfs_fs_info));
+ fs_info = calloc(1, sizeof(struct btrfs_fs_info));
if (!fs_info)
return NULL;
- memset(fs_info, 0, sizeof(struct btrfs_fs_info));
-
- fs_info->tree_root = malloc(sizeof(struct btrfs_root));
- fs_info->extent_root = malloc(sizeof(struct btrfs_root));
- fs_info->chunk_root = malloc(sizeof(struct btrfs_root));
- fs_info->dev_root = malloc(sizeof(struct btrfs_root));
- fs_info->csum_root = malloc(sizeof(struct btrfs_root));
- fs_info->quota_root = malloc(sizeof(struct btrfs_root));
- fs_info->super_copy = malloc(BTRFS_SUPER_INFO_SIZE);
+ fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
+ 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;
- memset(fs_info->super_copy, 0, BTRFS_SUPER_INFO_SIZE);
- memset(fs_info->tree_root, 0, sizeof(struct btrfs_root));
- memset(fs_info->extent_root, 0, sizeof(struct btrfs_root));
- memset(fs_info->chunk_root, 0, sizeof(struct btrfs_root));
- memset(fs_info->dev_root, 0, sizeof(struct btrfs_root));
- memset(fs_info->csum_root, 0, sizeof(struct btrfs_root));
- memset(fs_info->quota_root, 0, sizeof(struct btrfs_root));
-
extent_io_tree_init(&fs_info->extent_cache);
extent_io_tree_init(&fs_info->free_space_cache);
extent_io_tree_init(&fs_info->block_group_cache);
{
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);
root = fs_info->tree_root;
__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)) {
if (ret == 0)
fs_info->quota_enabled = 1;
+ if (btrfs_fs_compat_ro(fs_info, BTRFS_FEATURE_COMPAT_RO_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) {
printk("Couldn't setup log root tree\n");
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)
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;
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,
+ u64 chunk_root_bytenr,
enum btrfs_open_ctree_flags flags)
{
struct btrfs_fs_info *fs_info;
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;
ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr,
(flags & OPEN_CTREE_RECOVER_SUPER),
goto out;
disk_super = fs_info->super_copy;
- if (!(flags & OPEN_CTREE_RECOVER_SUPER))
+ if (flags & OPEN_CTREE_RECOVER_SUPER)
ret = btrfs_read_dev_super(fs_devices->latest_bdev,
disk_super, sb_bytenr, 1);
else
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,
+ u64 chunk_root_bytenr,
enum btrfs_open_ctree_flags 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_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)
enum btrfs_open_ctree_flags 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 */
+ BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
+ info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
if (!info)
return NULL;
if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
return info->fs_root;
}
+/*
+ * Check if the super is valid:
+ * - nodesize/sectorsize - minimum, maximum, alignment
+ * - tree block starts - alignment
+ * - number of devices - something sane
+ * - sys array size - maximum
+ */
+static int check_super(struct btrfs_super_block *sb)
+{
+ char result[BTRFS_CSUM_SIZE];
+ u32 crc;
+ u16 csum_type;
+ int csum_size;
+
+ if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
+ error("superblock magic doesn't match");
+ return -EIO;
+ }
+
+ csum_type = btrfs_super_csum_type(sb);
+ if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
+ error("unsupported checksum algorithm %u\n", 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,
+ BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, result);
+
+ if (memcmp(result, sb->csum, csum_size)) {
+ error("superblock checksum mismatch");
+ return -EIO;
+ }
+ if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ 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) {
+ 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) {
+ 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)) {
+ error("tree_root block unaligned: %llu", btrfs_super_root(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
+ error("chunk_root block unaligned: %llu",
+ btrfs_super_chunk_root(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
+ error("log_root block unaligned: %llu",
+ btrfs_super_log_root(sb));
+ goto error_out;
+ }
+ if (btrfs_super_nodesize(sb) < 4096) {
+ error("nodesize too small: %u < 4096",
+ btrfs_super_nodesize(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
+ error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
+ goto error_out;
+ }
+ if (btrfs_super_sectorsize(sb) < 4096) {
+ error("sectorsize too small: %u < 4096",
+ btrfs_super_sectorsize(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
+ 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) {
+ char fsid[BTRFS_UUID_UNPARSED_SIZE];
+ char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
+
+ uuid_unparse(sb->fsid, fsid);
+ uuid_unparse(sb->dev_item.fsid, dev_fsid);
+ 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)) {
+ warning("suspicious number of devices: %llu",
+ btrfs_super_num_devices(sb));
+ }
+
+ if (btrfs_super_num_devices(sb) == 0) {
+ error("number of devices is 0");
+ goto error_out;
+ }
+
+ /*
+ * Obvious sys_chunk_array corruptions, it must hold at least one key
+ * and one chunk
+ */
+ if (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)) {
+ error("system chunk array too small %u < %lu",
+ 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)
{
u8 fsid[BTRFS_FSID_SIZE];
int fsid_is_initialized = 0;
- struct btrfs_super_block buf;
+ char tmp[BTRFS_SUPER_INFO_SIZE];
+ struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
int i;
int ret;
int max_super = super_recover ? BTRFS_SUPER_MIRROR_MAX : 1;
u64 bytenr;
if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
- ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
- if (ret < sizeof(buf))
+ ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
+ if (ret < BTRFS_SUPER_INFO_SIZE)
return -1;
- if (btrfs_super_bytenr(&buf) != sb_bytenr ||
- btrfs_super_magic(&buf) != BTRFS_MAGIC)
+ if (btrfs_super_bytenr(buf) != sb_bytenr)
return -1;
- memcpy(sb, &buf, sizeof(*sb));
+ if (check_super(buf))
+ return -1;
+ memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
return 0;
}
for (i = 0; i < max_super; i++) {
bytenr = btrfs_sb_offset(i);
- ret = pread64(fd, &buf, sizeof(buf), bytenr);
- if (ret < sizeof(buf))
+ ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
+ if (ret < BTRFS_SUPER_INFO_SIZE)
break;
- if (btrfs_super_bytenr(&buf) != bytenr )
+ if (btrfs_super_bytenr(buf) != bytenr )
continue;
/* if magic is NULL, the device was removed */
- if (btrfs_super_magic(&buf) == 0 && i == 0)
- return -1;
- if (btrfs_super_magic(&buf) != BTRFS_MAGIC)
+ if (btrfs_super_magic(buf) == 0 && i == 0)
+ break;
+ if (check_super(buf))
continue;
if (!fsid_is_initialized) {
- memcpy(fsid, buf.fsid, sizeof(fsid));
+ memcpy(fsid, buf->fsid, sizeof(fsid));
fsid_is_initialized = 1;
- } else if (memcmp(fsid, buf.fsid, sizeof(fsid))) {
+ } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
/*
* the superblocks (the original one and
* its backups) contain data of different
continue;
}
- if (btrfs_super_generation(&buf) > transid) {
- memcpy(sb, &buf, sizeof(*sb));
- transid = btrfs_super_generation(&buf);
+ if (btrfs_super_generation(buf) > transid) {
+ memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
+ transid = btrfs_super_generation(buf);
}
}
ret = pwrite64(device->fd, root->fs_info->super_copy,
BTRFS_SUPER_INFO_SIZE,
root->fs_info->super_bytenr);
- BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
+ if (ret != BTRFS_SUPER_INFO_SIZE)
+ goto write_err;
return 0;
}
*/
ret = pwrite64(device->fd, root->fs_info->super_copy,
BTRFS_SUPER_INFO_SIZE, bytenr);
- BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
+ if (ret != BTRFS_SUPER_INFO_SIZE)
+ goto write_err;
}
return 0;
+
+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));
+ return ret;
}
int write_all_supers(struct btrfs_root *root)
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);