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Btrfs: superblock duplication
This patch implements superblock duplication. Superblocks are stored at offset 16K, 64M and 256G on every devices. Spaces used by superblocks are preserved by the allocator, which uses a reverse mapping function to find the logical addresses that correspond to superblocks. Thank you, Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng
Chris Mason
parent
d20f7043fa
commit
a512bbf855
8 changed files with 279 additions and 119 deletions
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@ -1595,8 +1595,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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fs_info, BTRFS_ROOT_TREE_OBJECTID);
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bh = __bread(fs_devices->latest_bdev,
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BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
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bh = btrfs_read_dev_super(fs_devices->latest_bdev);
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if (!bh)
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goto fail_iput;
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@ -1710,7 +1709,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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}
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mutex_lock(&fs_info->chunk_mutex);
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ret = btrfs_read_sys_array(tree_root);
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ret = btrfs_read_sys_array(tree_root, btrfs_super_bytenr(disk_super));
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mutex_unlock(&fs_info->chunk_mutex);
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if (ret) {
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printk("btrfs: failed to read the system array on %s\n",
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@ -1905,19 +1904,147 @@ static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
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put_bh(bh);
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}
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static int write_all_supers(struct btrfs_root *root)
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struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
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{
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struct buffer_head *bh;
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struct buffer_head *latest = NULL;
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struct btrfs_super_block *super;
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int i;
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u64 transid = 0;
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u64 bytenr;
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/* we would like to check all the supers, but that would make
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* a btrfs mount succeed after a mkfs from a different FS.
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* So, we need to add a special mount option to scan for
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* later supers, using BTRFS_SUPER_MIRROR_MAX instead
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*/
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for (i = 0; i < 1; i++) {
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bytenr = btrfs_sb_offset(i);
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if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
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break;
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bh = __bread(bdev, bytenr / 4096, 4096);
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if (!bh)
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continue;
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super = (struct btrfs_super_block *)bh->b_data;
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if (btrfs_super_bytenr(super) != bytenr ||
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strncmp((char *)(&super->magic), BTRFS_MAGIC,
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sizeof(super->magic))) {
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brelse(bh);
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continue;
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}
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if (!latest || btrfs_super_generation(super) > transid) {
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brelse(latest);
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latest = bh;
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transid = btrfs_super_generation(super);
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} else {
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brelse(bh);
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}
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}
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return latest;
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}
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static int write_dev_supers(struct btrfs_device *device,
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struct btrfs_super_block *sb,
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int do_barriers, int wait, int max_mirrors)
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{
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struct buffer_head *bh;
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int i;
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int ret;
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int errors = 0;
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u32 crc;
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u64 bytenr;
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int last_barrier = 0;
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if (max_mirrors == 0)
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max_mirrors = BTRFS_SUPER_MIRROR_MAX;
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/* make sure only the last submit_bh does a barrier */
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if (do_barriers) {
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for (i = 0; i < max_mirrors; i++) {
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bytenr = btrfs_sb_offset(i);
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if (bytenr + BTRFS_SUPER_INFO_SIZE >=
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device->total_bytes)
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break;
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last_barrier = i;
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}
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}
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for (i = 0; i < max_mirrors; i++) {
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bytenr = btrfs_sb_offset(i);
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if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
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break;
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if (wait) {
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bh = __find_get_block(device->bdev, bytenr / 4096,
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BTRFS_SUPER_INFO_SIZE);
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BUG_ON(!bh);
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brelse(bh);
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wait_on_buffer(bh);
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if (buffer_uptodate(bh)) {
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brelse(bh);
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continue;
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}
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} else {
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btrfs_set_super_bytenr(sb, bytenr);
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crc = ~(u32)0;
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crc = btrfs_csum_data(NULL, (char *)sb +
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BTRFS_CSUM_SIZE, crc,
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BTRFS_SUPER_INFO_SIZE -
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BTRFS_CSUM_SIZE);
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btrfs_csum_final(crc, sb->csum);
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bh = __getblk(device->bdev, bytenr / 4096,
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BTRFS_SUPER_INFO_SIZE);
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memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
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set_buffer_uptodate(bh);
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get_bh(bh);
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lock_buffer(bh);
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bh->b_end_io = btrfs_end_buffer_write_sync;
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}
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if (i == last_barrier && do_barriers && device->barriers) {
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ret = submit_bh(WRITE_BARRIER, bh);
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if (ret == -EOPNOTSUPP) {
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printk("btrfs: disabling barriers on dev %s\n",
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device->name);
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set_buffer_uptodate(bh);
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device->barriers = 0;
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get_bh(bh);
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lock_buffer(bh);
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ret = submit_bh(WRITE, bh);
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}
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} else {
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ret = submit_bh(WRITE, bh);
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}
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if (!ret && wait) {
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh))
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errors++;
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} else if (ret) {
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errors++;
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}
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if (wait)
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brelse(bh);
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}
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return errors < i ? 0 : -1;
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}
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int write_all_supers(struct btrfs_root *root, int max_mirrors)
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{
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struct list_head *cur;
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struct list_head *head = &root->fs_info->fs_devices->devices;
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struct btrfs_device *dev;
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struct btrfs_super_block *sb;
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struct btrfs_dev_item *dev_item;
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struct buffer_head *bh;
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int ret;
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int do_barriers;
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int max_errors;
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int total_errors = 0;
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u32 crc;
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u64 flags;
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max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
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@ -1944,40 +2071,11 @@ static int write_all_supers(struct btrfs_root *root)
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btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
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memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
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memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
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flags = btrfs_super_flags(sb);
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btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
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crc = ~(u32)0;
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crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc,
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BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
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btrfs_csum_final(crc, sb->csum);
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bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096,
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BTRFS_SUPER_INFO_SIZE);
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memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
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dev->pending_io = bh;
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get_bh(bh);
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set_buffer_uptodate(bh);
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lock_buffer(bh);
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bh->b_end_io = btrfs_end_buffer_write_sync;
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if (do_barriers && dev->barriers) {
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ret = submit_bh(WRITE_BARRIER, bh);
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if (ret == -EOPNOTSUPP) {
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printk("btrfs: disabling barriers on dev %s\n",
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dev->name);
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set_buffer_uptodate(bh);
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dev->barriers = 0;
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get_bh(bh);
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lock_buffer(bh);
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ret = submit_bh(WRITE, bh);
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}
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} else {
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ret = submit_bh(WRITE, bh);
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}
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ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
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if (ret)
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total_errors++;
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}
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@ -1985,8 +2083,8 @@ static int write_all_supers(struct btrfs_root *root)
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printk("btrfs: %d errors while writing supers\n", total_errors);
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BUG();
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}
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total_errors = 0;
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total_errors = 0;
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list_for_each(cur, head) {
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dev = list_entry(cur, struct btrfs_device, dev_list);
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if (!dev->bdev)
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@ -1994,29 +2092,9 @@ static int write_all_supers(struct btrfs_root *root)
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if (!dev->in_fs_metadata || !dev->writeable)
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continue;
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BUG_ON(!dev->pending_io);
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bh = dev->pending_io;
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wait_on_buffer(bh);
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if (!buffer_uptodate(dev->pending_io)) {
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if (do_barriers && dev->barriers) {
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printk("btrfs: disabling barriers on dev %s\n",
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dev->name);
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set_buffer_uptodate(bh);
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get_bh(bh);
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lock_buffer(bh);
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dev->barriers = 0;
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ret = submit_bh(WRITE, bh);
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BUG_ON(ret);
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh))
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total_errors++;
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} else {
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total_errors++;
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}
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}
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dev->pending_io = NULL;
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brelse(bh);
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ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
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if (ret)
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total_errors++;
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}
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if (total_errors > max_errors) {
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printk("btrfs: %d errors while writing supers\n", total_errors);
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@ -2025,12 +2103,12 @@ static int write_all_supers(struct btrfs_root *root)
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return 0;
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}
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int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
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*root)
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int write_ctree_super(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, int max_mirrors)
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{
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int ret;
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ret = write_all_supers(root);
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ret = write_all_supers(root, max_mirrors);
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return ret;
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}
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@ -2116,7 +2194,7 @@ int btrfs_commit_super(struct btrfs_root *root)
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ret = btrfs_write_and_wait_transaction(NULL, root);
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BUG_ON(ret);
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ret = write_ctree_super(NULL, root);
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ret = write_ctree_super(NULL, root, 0);
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return ret;
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}
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@ -19,8 +19,20 @@
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#ifndef __DISKIO__
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#define __DISKIO__
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#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
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#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
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#define BTRFS_SUPER_INFO_SIZE 4096
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#define BTRFS_SUPER_MIRROR_MAX 3
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#define BTRFS_SUPER_MIRROR_SHIFT 12
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static inline u64 btrfs_sb_offset(int mirror)
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{
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u64 start = 16 * 1024;
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if (mirror)
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return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
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return BTRFS_SUPER_INFO_OFFSET;
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}
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struct btrfs_device;
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struct btrfs_fs_devices;
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@ -37,7 +49,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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char *options);
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int close_ctree(struct btrfs_root *root);
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int write_ctree_super(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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struct btrfs_root *root, int max_mirrors);
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struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
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int btrfs_commit_super(struct btrfs_root *root);
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struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
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u64 bytenr, u32 blocksize);
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@ -189,6 +189,29 @@ static int add_new_free_space(struct btrfs_block_group_cache *block_group,
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return 0;
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}
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static int remove_sb_from_cache(struct btrfs_root *root,
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struct btrfs_block_group_cache *cache)
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{
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u64 bytenr;
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u64 *logical;
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int stripe_len;
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int i, nr, ret;
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for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
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bytenr = btrfs_sb_offset(i);
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ret = btrfs_rmap_block(&root->fs_info->mapping_tree,
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cache->key.objectid, bytenr, 0,
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&logical, &nr, &stripe_len);
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BUG_ON(ret);
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while (nr--) {
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btrfs_remove_free_space(cache, logical[nr],
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stripe_len);
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}
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kfree(logical);
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}
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return 0;
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}
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static int cache_block_group(struct btrfs_root *root,
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struct btrfs_block_group_cache *block_group)
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{
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@ -197,9 +220,7 @@ static int cache_block_group(struct btrfs_root *root,
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struct btrfs_key key;
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struct extent_buffer *leaf;
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int slot;
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u64 last = 0;
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u64 first_free;
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int found = 0;
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u64 last = block_group->key.objectid;
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if (!block_group)
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return 0;
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@ -220,23 +241,13 @@ static int cache_block_group(struct btrfs_root *root,
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* skip the locking here
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*/
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path->skip_locking = 1;
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first_free = max_t(u64, block_group->key.objectid,
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BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE);
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key.objectid = block_group->key.objectid;
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key.objectid = last;
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key.offset = 0;
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btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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goto err;
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ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
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if (ret < 0)
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goto err;
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if (ret == 0) {
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leaf = path->nodes[0];
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btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
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if (key.objectid + key.offset > first_free)
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first_free = key.objectid + key.offset;
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}
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while(1) {
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leaf = path->nodes[0];
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slot = path->slots[0];
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@ -258,11 +269,6 @@ static int cache_block_group(struct btrfs_root *root,
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break;
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if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) {
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if (!found) {
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last = first_free;
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found = 1;
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}
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add_new_free_space(block_group, root->fs_info, last,
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key.objectid);
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@ -272,13 +278,11 @@ static int cache_block_group(struct btrfs_root *root,
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path->slots[0]++;
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}
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if (!found)
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last = first_free;
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add_new_free_space(block_group, root->fs_info, last,
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block_group->key.objectid +
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block_group->key.offset);
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remove_sb_from_cache(root, block_group);
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block_group->cached = 1;
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ret = 0;
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err:
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@ -1974,10 +1978,8 @@ static int update_block_group(struct btrfs_trans_handle *trans,
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if (alloc) {
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old_val += num_bytes;
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cache->space_info->bytes_used += num_bytes;
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if (cache->ro) {
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if (cache->ro)
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cache->space_info->bytes_readonly -= num_bytes;
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WARN_ON(1);
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}
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btrfs_set_block_group_used(&cache->item, old_val);
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spin_unlock(&cache->lock);
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spin_unlock(&cache->space_info->lock);
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@ -290,7 +290,6 @@ __btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
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ret = -EINVAL;
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goto out;
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}
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unlink_free_space(block_group, info);
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if (info->bytes == bytes) {
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@ -1038,7 +1038,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
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mutex_unlock(&root->fs_info->trans_mutex);
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ret = btrfs_write_and_wait_transaction(trans, root);
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BUG_ON(ret);
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write_ctree_super(trans, root);
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write_ctree_super(trans, root, 0);
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/*
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||||
* the super is written, we can safely allow the tree-loggers
|
||||
|
|
|
|||
|
|
@ -1996,7 +1996,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
|
|||
btrfs_set_super_log_root_level(&root->fs_info->super_for_commit,
|
||||
btrfs_header_level(log->fs_info->log_root_tree->node));
|
||||
|
||||
write_ctree_super(trans, log->fs_info->tree_root);
|
||||
write_ctree_super(trans, log->fs_info->tree_root, 2);
|
||||
log->fs_info->tree_log_transid++;
|
||||
log->fs_info->tree_log_batch = 0;
|
||||
atomic_set(&log->fs_info->tree_log_commit, 0);
|
||||
|
|
@ -2006,7 +2006,6 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
|
|||
out:
|
||||
mutex_unlock(&log->fs_info->tree_log_mutex);
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
||||
/* * free all the extents used by the tree log. This should be called
|
||||
|
|
|
|||
|
|
@ -423,15 +423,11 @@ int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
|
|||
}
|
||||
set_blocksize(bdev, 4096);
|
||||
|
||||
bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
|
||||
bh = btrfs_read_dev_super(bdev);
|
||||
if (!bh)
|
||||
goto error_close;
|
||||
|
||||
disk_super = (struct btrfs_super_block *)bh->b_data;
|
||||
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
|
||||
sizeof(disk_super->magic)))
|
||||
goto error_brelse;
|
||||
|
||||
devid = le64_to_cpu(disk_super->dev_item.devid);
|
||||
if (devid != device->devid)
|
||||
goto error_brelse;
|
||||
|
|
@ -529,17 +525,12 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
|
|||
ret = set_blocksize(bdev, 4096);
|
||||
if (ret)
|
||||
goto error_close;
|
||||
bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
|
||||
bh = btrfs_read_dev_super(bdev);
|
||||
if (!bh) {
|
||||
ret = -EIO;
|
||||
goto error_close;
|
||||
}
|
||||
disk_super = (struct btrfs_super_block *)bh->b_data;
|
||||
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
|
||||
sizeof(disk_super->magic))) {
|
||||
ret = -EINVAL;
|
||||
goto error_brelse;
|
||||
}
|
||||
devid = le64_to_cpu(disk_super->dev_item.devid);
|
||||
transid = btrfs_super_generation(disk_super);
|
||||
if (disk_super->label[0])
|
||||
|
|
@ -553,7 +544,6 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
|
|||
printk("devid %Lu transid %Lu %s\n", devid, transid, path);
|
||||
ret = device_list_add(path, disk_super, devid, fs_devices_ret);
|
||||
|
||||
error_brelse:
|
||||
brelse(bh);
|
||||
error_close:
|
||||
close_bdev_exclusive(bdev, flags);
|
||||
|
|
@ -1016,17 +1006,12 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
|
|||
}
|
||||
|
||||
set_blocksize(bdev, 4096);
|
||||
bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
|
||||
bh = btrfs_read_dev_super(bdev);
|
||||
if (!bh) {
|
||||
ret = -EIO;
|
||||
goto error_close;
|
||||
}
|
||||
disk_super = (struct btrfs_super_block *)bh->b_data;
|
||||
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
|
||||
sizeof(disk_super->magic))) {
|
||||
ret = -ENOENT;
|
||||
goto error_brelse;
|
||||
}
|
||||
devid = le64_to_cpu(disk_super->dev_item.devid);
|
||||
dev_uuid = disk_super->dev_item.uuid;
|
||||
device = btrfs_find_device(root, devid, dev_uuid,
|
||||
|
|
@ -2563,6 +2548,88 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
|
|||
mirror_num, NULL);
|
||||
}
|
||||
|
||||
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
|
||||
u64 chunk_start, u64 physical, u64 devid,
|
||||
u64 **logical, int *naddrs, int *stripe_len)
|
||||
{
|
||||
struct extent_map_tree *em_tree = &map_tree->map_tree;
|
||||
struct extent_map *em;
|
||||
struct map_lookup *map;
|
||||
u64 *buf;
|
||||
u64 bytenr;
|
||||
u64 length;
|
||||
u64 stripe_nr;
|
||||
int i, j, nr = 0;
|
||||
|
||||
spin_lock(&em_tree->lock);
|
||||
em = lookup_extent_mapping(em_tree, chunk_start, 1);
|
||||
spin_unlock(&em_tree->lock);
|
||||
|
||||
BUG_ON(!em || em->start != chunk_start);
|
||||
map = (struct map_lookup *)em->bdev;
|
||||
|
||||
length = em->len;
|
||||
if (map->type & BTRFS_BLOCK_GROUP_RAID10)
|
||||
do_div(length, map->num_stripes / map->sub_stripes);
|
||||
else if (map->type & BTRFS_BLOCK_GROUP_RAID0)
|
||||
do_div(length, map->num_stripes);
|
||||
|
||||
buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS);
|
||||
BUG_ON(!buf);
|
||||
|
||||
for (i = 0; i < map->num_stripes; i++) {
|
||||
if (devid && map->stripes[i].dev->devid != devid)
|
||||
continue;
|
||||
if (map->stripes[i].physical > physical ||
|
||||
map->stripes[i].physical + length <= physical)
|
||||
continue;
|
||||
|
||||
stripe_nr = physical - map->stripes[i].physical;
|
||||
do_div(stripe_nr, map->stripe_len);
|
||||
|
||||
if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
|
||||
stripe_nr = stripe_nr * map->num_stripes + i;
|
||||
do_div(stripe_nr, map->sub_stripes);
|
||||
} else if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
|
||||
stripe_nr = stripe_nr * map->num_stripes + i;
|
||||
}
|
||||
bytenr = chunk_start + stripe_nr * map->stripe_len;
|
||||
for (j = 0; j < nr; j++) {
|
||||
if (buf[j] == bytenr)
|
||||
break;
|
||||
}
|
||||
if (j == nr)
|
||||
buf[nr++] = bytenr;
|
||||
}
|
||||
|
||||
for (i = 0; i > nr; i++) {
|
||||
struct btrfs_multi_bio *multi;
|
||||
struct btrfs_bio_stripe *stripe;
|
||||
int ret;
|
||||
|
||||
length = 1;
|
||||
ret = btrfs_map_block(map_tree, WRITE, buf[i],
|
||||
&length, &multi, 0);
|
||||
BUG_ON(ret);
|
||||
|
||||
stripe = multi->stripes;
|
||||
for (j = 0; j < multi->num_stripes; j++) {
|
||||
if (stripe->physical >= physical &&
|
||||
physical < stripe->physical + length)
|
||||
break;
|
||||
}
|
||||
BUG_ON(j >= multi->num_stripes);
|
||||
kfree(multi);
|
||||
}
|
||||
|
||||
*logical = buf;
|
||||
*naddrs = nr;
|
||||
*stripe_len = map->stripe_len;
|
||||
|
||||
free_extent_map(em);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
|
||||
u64 logical, struct page *page)
|
||||
{
|
||||
|
|
@ -3003,7 +3070,7 @@ int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf)
|
|||
return read_one_dev(root, buf, dev_item);
|
||||
}
|
||||
|
||||
int btrfs_read_sys_array(struct btrfs_root *root)
|
||||
int btrfs_read_sys_array(struct btrfs_root *root, u64 sb_bytenr)
|
||||
{
|
||||
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
|
||||
struct extent_buffer *sb;
|
||||
|
|
@ -3018,7 +3085,7 @@ int btrfs_read_sys_array(struct btrfs_root *root)
|
|||
u32 cur;
|
||||
struct btrfs_key key;
|
||||
|
||||
sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
|
||||
sb = btrfs_find_create_tree_block(root, sb_bytenr,
|
||||
BTRFS_SUPER_INFO_SIZE);
|
||||
if (!sb)
|
||||
return -ENOMEM;
|
||||
|
|
|
|||
|
|
@ -28,7 +28,6 @@ struct btrfs_device {
|
|||
struct list_head dev_alloc_list;
|
||||
struct btrfs_fs_devices *fs_devices;
|
||||
struct btrfs_root *dev_root;
|
||||
struct buffer_head *pending_io;
|
||||
struct bio *pending_bios;
|
||||
struct bio *pending_bio_tail;
|
||||
int running_pending;
|
||||
|
|
@ -125,7 +124,10 @@ int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
|
|||
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
|
||||
u64 logical, u64 *length,
|
||||
struct btrfs_multi_bio **multi_ret, int mirror_num);
|
||||
int btrfs_read_sys_array(struct btrfs_root *root);
|
||||
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
|
||||
u64 chunk_start, u64 physical, u64 devid,
|
||||
u64 **logical, int *naddrs, int *stripe_len);
|
||||
int btrfs_read_sys_array(struct btrfs_root *root, u64 sb_bytenr);
|
||||
int btrfs_read_chunk_tree(struct btrfs_root *root);
|
||||
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_root *extent_root, u64 type);
|
||||
|
|
|
|||
Loading…
Reference in a new issue