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NFS: Remove nfs_page_group_clear_bits()

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At this point, we only expect ever to potentially see PG_REMOVE and
PG_TEARDOWN being set on the subrequests.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-07-19 13:50:07 -04:00
parent 5b2b5187fa
commit 902a4c0046
1 changed files with 3 additions and 26 deletions
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29
fs/nfs/write.c
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@ -347,22 +347,6 @@ static void nfs_end_page_writeback(struct nfs_page *req)
clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
}
/* nfs_page_group_clear_bits
* @req - an nfs request
* clears all page group related bits from @req
*/
static void
nfs_page_group_clear_bits(struct nfs_page *req)
{
clear_bit(PG_TEARDOWN, &req->wb_flags);
clear_bit(PG_UNLOCKPAGE, &req->wb_flags);
clear_bit(PG_UPTODATE, &req->wb_flags);
clear_bit(PG_WB_END, &req->wb_flags);
clear_bit(PG_REMOVE, &req->wb_flags);
}
/*
* nfs_unroll_locks_and_wait - unlock all newly locked reqs and wait on @req
*
@ -417,13 +401,12 @@ nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
/* make sure old group is not used */
subreq->wb_this_page = subreq;
clear_bit(PG_REMOVE, &subreq->wb_flags);
/* Note: races with nfs_page_group_destroy() */
if (!kref_read(&subreq->wb_kref)) {
bool freeme = test_bit(PG_TEARDOWN, &subreq->wb_flags);
nfs_page_group_clear_bits(subreq);
/* Check if we raced with nfs_page_group_destroy() */
if (freeme)
if (test_and_clear_bit(PG_TEARDOWN, &subreq->wb_flags))
nfs_free_request(subreq);
continue;
}
@ -437,7 +420,6 @@ nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
spin_unlock(&inode->i_lock);
}
nfs_page_group_clear_bits(subreq);
/* subreq is now totally disconnected from page group or any
* write / commit lists. last chance to wake any waiters */
nfs_unlock_and_release_request(subreq);
@ -573,11 +555,6 @@ try_again:
spin_unlock(&inode->i_lock);
}
/*
* prepare head request to be added to new pgio descriptor
*/
nfs_page_group_clear_bits(head);
nfs_page_group_unlock(head);
nfs_destroy_unlinked_subrequests(destroy_list, head, inode);