return 0;
}
+void btrfs_close_all_devices(void)
+{
+ struct btrfs_fs_devices *fs_devices;
+
+ while (!list_empty(&fs_uuids)) {
+ fs_devices = list_entry(fs_uuids.next, struct btrfs_fs_devices,
+ list);
+ btrfs_close_devices(fs_devices);
+ }
+}
+
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, int flags)
{
int fd;
u64 *total_devs, u64 super_offset, int super_recover)
{
struct btrfs_super_block *disk_super;
- char *buf;
+ char buf[BTRFS_SUPER_INFO_SIZE];
int ret;
u64 devid;
- buf = malloc(4096);
- if (!buf) {
- ret = -ENOMEM;
- goto error;
- }
disk_super = (struct btrfs_super_block *)buf;
ret = btrfs_read_dev_super(fd, disk_super, super_offset, super_recover);
- if (ret < 0) {
- ret = -EIO;
- goto error_brelse;
- }
+ if (ret < 0)
+ return -EIO;
devid = btrfs_stack_device_id(&disk_super->dev_item);
if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)
*total_devs = 1;
ret = device_list_add(path, disk_super, devid, fs_devices_ret);
-error_brelse:
- free(buf);
-error:
return ret;
}
return ret;
}
-int btrfs_next_metadata(struct btrfs_mapping_tree *map_tree, u64 *logical,
- u64 *size)
+int btrfs_next_bg(struct btrfs_mapping_tree *map_tree, u64 *logical,
+ u64 *size, u64 type)
{
struct cache_extent *ce;
struct map_lookup *map;
+ u64 cur = *logical;
- ce = search_cache_extent(&map_tree->cache_tree, *logical);
+ ce = search_cache_extent(&map_tree->cache_tree, cur);
while (ce) {
- ce = next_cache_extent(ce);
- if (!ce)
- return -ENOENT;
+ /*
+ * only jump to next bg if our cur is not 0
+ * As the initial logical for btrfs_next_bg() is 0, and
+ * if we jump to next bg, we skipped a valid bg.
+ */
+ if (cur) {
+ ce = next_cache_extent(ce);
+ if (!ce)
+ return -ENOENT;
+ }
+ cur = ce->start;
map = container_of(ce, struct map_lookup, ce);
- if (map->type & BTRFS_BLOCK_GROUP_METADATA) {
+ if (map->type & type) {
*logical = ce->start;
*size = ce->size;
return 0;
struct cache_extent *ce;
u64 logical;
u64 length;
+ u64 stripe_len;
u64 devid;
u8 uuid[BTRFS_UUID_SIZE];
int num_stripes;
logical = key->offset;
length = btrfs_chunk_length(leaf, chunk);
+ stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
+ num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ /* Validation check */
+ if (!num_stripes) {
+ error("invalid chunk num_stripes: %u", num_stripes);
+ return -EIO;
+ }
+ if (!IS_ALIGNED(logical, root->sectorsize)) {
+ error("invalid chunk logical %llu", logical);
+ return -EIO;
+ }
+ if (!length || !IS_ALIGNED(length, root->sectorsize)) {
+ error("invalid chunk length %llu", length);
+ return -EIO;
+ }
+ if (!is_power_of_2(stripe_len)) {
+ error("invalid chunk stripe length: %llu", stripe_len);
+ return -EIO;
+ }
+ if (~(BTRFS_BLOCK_GROUP_TYPE_MASK | BTRFS_BLOCK_GROUP_PROFILE_MASK) &
+ btrfs_chunk_type(leaf, chunk)) {
+ error("unrecognized chunk type: %llu",
+ ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_BLOCK_GROUP_PROFILE_MASK) &
+ btrfs_chunk_type(leaf, chunk));
+ return -EIO;
+ }
ce = search_cache_extent(&map_tree->cache_tree, logical);
return 0;
}
- num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
map = kmalloc(btrfs_map_lookup_size(num_stripes), GFP_NOFS);
if (!map)
return -ENOMEM;
device = btrfs_find_device(root, devid, dev_uuid, fs_uuid);
if (!device) {
- printk("warning devid %llu not found already\n",
- (unsigned long long)devid);
device = kzalloc(sizeof(*device), GFP_NOFS);
if (!device)
return -ENOMEM;
struct extent_buffer *sb;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;
- struct btrfs_key key;
+ u8 *array_ptr;
+ unsigned long sb_array_offset;
+ int ret = 0;
u32 num_stripes;
+ u32 array_size;
u32 len = 0;
- u8 *ptr;
- u8 *array_end;
- int ret = 0;
+ u32 cur_offset;
+ struct btrfs_key key;
- sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
+ sb = btrfs_find_create_tree_block(root->fs_info,
+ BTRFS_SUPER_INFO_OFFSET,
BTRFS_SUPER_INFO_SIZE);
if (!sb)
return -ENOMEM;
btrfs_set_buffer_uptodate(sb);
write_extent_buffer(sb, super_copy, 0, sizeof(*super_copy));
- array_end = ((u8 *)super_copy->sys_chunk_array) +
- btrfs_super_sys_array_size(super_copy);
+ array_size = btrfs_super_sys_array_size(super_copy);
- /*
- * we do this loop twice, once for the device items and
- * once for all of the chunks. This way there are device
- * structs filled in for every chunk
- */
- ptr = super_copy->sys_chunk_array;
+ array_ptr = super_copy->sys_chunk_array;
+ sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array);
+ cur_offset = 0;
+
+ while (cur_offset < array_size) {
+ disk_key = (struct btrfs_disk_key *)array_ptr;
+ len = sizeof(*disk_key);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
- while (ptr < array_end) {
- disk_key = (struct btrfs_disk_key *)ptr;
btrfs_disk_key_to_cpu(&key, disk_key);
- len = sizeof(*disk_key);
- ptr += len;
+ array_ptr += len;
+ sb_array_offset += len;
+ cur_offset += len;
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
- chunk = (struct btrfs_chunk *)(ptr - (u8 *)super_copy);
+ chunk = (struct btrfs_chunk *)sb_array_offset;
+ /*
+ * At least one btrfs_chunk with one stripe must be
+ * present, exact stripe count check comes afterwards
+ */
+ len = btrfs_chunk_item_size(1);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
+ num_stripes = btrfs_chunk_num_stripes(sb, chunk);
+ if (!num_stripes) {
+ printk(
+ "ERROR: invalid number of stripes %u in sys_array at offset %u\n",
+ num_stripes, cur_offset);
+ ret = -EIO;
+ break;
+ }
+
+ len = btrfs_chunk_item_size(num_stripes);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
ret = read_one_chunk(root, &key, sb, chunk, -1);
if (ret)
break;
- num_stripes = btrfs_chunk_num_stripes(sb, chunk);
- len = btrfs_chunk_item_size(num_stripes);
} else {
- BUG();
+ printk(
+ "ERROR: unexpected item type %u in sys_array at offset %u\n",
+ (u32)key.type, cur_offset);
+ ret = -EIO;
+ break;
}
- ptr += len;
+ array_ptr += len;
+ sb_array_offset += len;
+ cur_offset += len;
}
free_extent_buffer(sb);
return ret;
+
+out_short_read:
+ printk("ERROR: sys_array too short to read %u bytes at offset %u\n",
+ len, cur_offset);
+ free_extent_buffer(sb);
+ return -EIO;
}
int btrfs_read_chunk_tree(struct btrfs_root *root)
if (raid_map[i] >= BTRFS_RAID5_P_STRIPE)
break;
- eb = malloc(sizeof(struct extent_buffer) + stripe_len);
+ eb = calloc(1, sizeof(struct extent_buffer) + stripe_len);
if (!eb)
BUG();
- memset(eb, 0, sizeof(struct extent_buffer) + stripe_len);
eb->start = raid_map[i];
eb->len = stripe_len;
projects / platform / upstream / btrfs-progs.git / blobdiff