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nilfs2: get rid of back pointer to writable sb instance
authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Sun, 5 Sep 2010 07:17:35 +0000 (16:17 +0900)
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Sat, 23 Oct 2010 00:24:38 +0000 (09:24 +0900)
Nilfs object holds a back pointer to a writable super block instance
in nilfs->ns_writer, and this became eliminable since sb is now made
per device and all inodes have a valid pointer to it.

This deletes the ns_writer pointer and a reader/writer semaphore
protecting it.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

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