1. 09 12月, 2008 1 次提交
    • Y
      Btrfs: superblock duplication · a512bbf8
      Yan Zheng 提交于
      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: NYan Zheng <zheng.yan@oracle.com>
      a512bbf8
  2. 02 12月, 2008 1 次提交
  3. 20 11月, 2008 1 次提交
  4. 18 11月, 2008 1 次提交
    • Y
      Btrfs: Seed device support · 2b82032c
      Yan Zheng 提交于
      Seed device is a special btrfs with SEEDING super flag
      set and can only be mounted in read-only mode. Seed
      devices allow people to create new btrfs on top of it.
      
      The new FS contains the same contents as the seed device,
      but it can be mounted in read-write mode.
      
      This patch does the following:
      
      1) split code in btrfs_alloc_chunk into two parts. The first part does makes
      the newly allocated chunk usable, but does not do any operation that modifies
      the chunk tree. The second part does the the chunk tree modifications. This
      division is for the bootstrap step of adding storage to the seed device.
      
      2) Update device management code to handle seed device.
      The basic idea is: For an FS grown from seed devices, its
      seed devices are put into a list. Seed devices are
      opened on demand at mounting time. If any seed device is
      missing or has been changed, btrfs kernel module will
      refuse to mount the FS.
      
      3) make btrfs_find_block_group not return NULL when all
      block groups are read-only.
      Signed-off-by: NYan Zheng <zheng.yan@oracle.com>
      2b82032c
  5. 25 9月, 2008 21 次提交