The patchset first enhance btrfs-find-root command and then use it to enhance open_ctree to provide a better chance to open heavily damaged btrfs.
Patch 1~9 are all enhancement/cleanup for btrfs-find-root in the following concepts. 1) Reuse existing infrastructure. Use existing or slightly modified infrastructure other than copy-n-modify codes. 2) Enhanced root search logic The old root search logic have many problems, like ignore newer root with smaller level and use wrong generation/level for searching. The new logic will keep a per-generation record to deal the tree search, and use different level/generation for different tree. 3) Make the find-root infrastructure exported to other commands. Allow other btrfs-progs components to use find-root infrastructure, e.g. open_ctree can use it if all primary/backup tree roots are corrupted. Patch 10 is enhancement for open_ctree to use find-root infrastructure. To: David Sterba <dste...@suse.cz> I also created a pull request at github if it's OK for you. https://github.com/kdave/btrfs-progs/pull/4 Qu Wenruo (10): btrfs-progs: Cleanup, use bitshift instead of immediate number in btrfs_open_ctree_flags. btrfs-progs: Add support to suppress tree block csum error output. btrfs-progs: Add new btrfs_open_ctree_flags CHUNK_ONLY. btrfs-progs: Add new find-root.[ch] infrastructure. btrfs-progs: Swith btrfs-find-root to use the new open_ctree flags. btrfs-progs: Add better search generation judgment for btrfs-find-root. btrfs-progs: Swith btrfs-find-root to use the find-root infrastructure. btrfs-progs: Cleanup unneeded btrfs-find-root codes. btrfs-progs: Add new option for btrfs-find-root to search through all the metadata extents. btrfs-progs: Allow open_ctree use backup tree root or search it automatically if primary tree root is corrupted. Documentation/btrfs-find-root.txt | 2 + Makefile | 2 +- btrfs-find-root.c | 379 +++++++++++++------------------------- ctree.h | 2 + disk-io.c | 128 +++++++++++-- disk-io.h | 24 ++- find-root.c | 139 ++++++++++++++ find-root.h | 84 +++++++++ 8 files changed, 486 insertions(+), 274 deletions(-) create mode 100644 find-root.c create mode 100644 find-root.h -- 2.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
