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Commit c988950e authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS: Simplify nfs_wb_page_cancel() 



In all cases we should be able to just remove the request and call
cancel_dirty_page().

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 2928db1f

fs/nfs/write.c

+1 −38
Original line number Diff line number Diff line
@@ -540,19 +540,6 @@ static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, u 
	return res;

}



static void nfs_cancel_commit_list(struct list_head *head)

{

	struct nfs_page *req;



	while(!list_empty(head)) {

		req = nfs_list_entry(head->next);

		nfs_list_remove_request(req);

		nfs_clear_request_commit(req);

		nfs_inode_remove_request(req);

		nfs_unlock_request(req);

	}

}



#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)

static int

nfs_need_commit(struct nfs_inode *nfsi)
@@ -1495,13 +1482,6 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr 
		pages = nfs_scan_commit(inode, &head, idx_start, npages);

		if (pages == 0)

			break;

		if (how & FLUSH_INVALIDATE) {

			spin_unlock(&inode->i_lock);

			nfs_cancel_commit_list(&head);

			ret = pages;

			spin_lock(&inode->i_lock);

			continue;

		}

		pages += nfs_scan_commit(inode, &head, 0, 0);

		spin_unlock(&inode->i_lock);

		ret = nfs_commit_list(inode, &head, how);
@@ -1558,26 +1538,13 @@ int nfs_wb_nocommit(struct inode *inode) 
int nfs_wb_page_cancel(struct inode *inode, struct page *page)

{

	struct nfs_page *req;

	loff_t range_start = page_offset(page);

	loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);

	struct writeback_control wbc = {

		.bdi = page->mapping->backing_dev_info,

		.sync_mode = WB_SYNC_ALL,

		.nr_to_write = LONG_MAX,

		.range_start = range_start,

		.range_end = range_end,

	};

	int ret = 0;



	BUG_ON(!PageLocked(page));

	for (;;) {

		req = nfs_page_find_request(page);

		if (req == NULL)

			goto out;

		if (test_bit(PG_CLEAN, &req->wb_flags)) {

			nfs_release_request(req);

			break;

		}

		if (nfs_lock_request_dontget(req)) {

			nfs_inode_remove_request(req);

			/*
@@ -1591,12 +1558,8 @@ int nfs_wb_page_cancel(struct inode *inode, struct page *page) 
		ret = nfs_wait_on_request(req);

		nfs_release_request(req);

		if (ret < 0)

			goto out;

			break;

	}

	if (!PagePrivate(page))

		return 0;

	ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE);

out:

	return ret;

}

include/linux/nfs_fs.h

+0 −2
Original line number Diff line number Diff line
@@ -34,8 +34,6 @@ 
#define FLUSH_LOWPRI		8	/* low priority background flush */

#define FLUSH_HIGHPRI		16	/* high priority memory reclaim flush */

#define FLUSH_NOCOMMIT		32	/* Don't send the NFSv3/v4 COMMIT */

#define FLUSH_INVALIDATE	64	/* Invalidate the page cache */

#define FLUSH_NOWRITEPAGE	128	/* Don't call writepage() */



#ifdef __KERNEL__