[v2]Enhance btrfs-find-root and open_ctree() to provide better chance on damaged btrfs.#4

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adam900710 wants to merge 10 commits intokdave:v3.18.xfrom adam900710:find-root-v2

+486-274

Commits on Jan 19, 2015

btrfs-progs: Cleanup, use bitshift instead of immediate number in btrfs_open_ctree_flags.
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btrfs-progs: Add support to suppress tree block csum error output.
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btrfs-progs: Add new btrfs_open_ctree_flags CHUNK_ONLY.
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btrfs-progs: Add new find-root.[ch] infrastructure.
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btrfs-progs: Switch btrfs-find-root to use the new open_ctree flags.
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btrfs-progs: Add better search generation judgment for btrfs-find-root.
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btrfs-progs: Swith btrfs-find-root to use the find-root infrastructure.
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btrfs-progs: Cleanup unneeded btrfs-find-root codes.
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btrfs-progs: Add new option for btrfs-find-root to search through all the metadata extents.
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btrfs-progs: Allow open_ctree use backup tree root or search it automatically if primary tree root is corrupted.
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