[PATCH 0/4] 2.6.21-rc7 NFS writes: fix a series of issues

I've split the issues introduced by the 2.6.21-rcX write code up into 4
subproblems.

The first patch is just a cleanup in order to ease review.

Patch number 2 ensures that we never release the PG_writeback flag until
_after_ we've either discarded the unstable request altogether, or put it
on the nfs_inode's commit or dirty lists.

Patch number 3 fixes the 'desynchronized value of nfs_i.ncommit' error. It
uses the PG_NEED_COMMIT flag as an indicator for whether or not the request
may be redirtied.

Patch number 4 protects the NFS '.set_page_dirty' address_space operation
against races with nfs_inode_add_request.

Cheers
  Trond
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• Follow-Ups:
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  • [PATCH 2/4] NFS: Don't clear PG_writeback until after we've processed unstable writes
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• References:
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    • From: OGAWA Hirofumi <[email protected]>

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