luck/tmp_suning_uos_patched
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NFS: nfs_set_page_writeback no longer needs to reference the page

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We now hold a reference to the nfs_page across the calls to
nfs_set_page_writeback and nfs_end_page_writeback, and that
means we already have a reference to the struct page.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Fred Isaman <iisaman@netapp.com>
This commit is contained in:
Trond Myklebust 2012-05-09 13:37:43 -04:00
parent 3aff4ebb95
commit d1182b33ed
1 changed files with 3 additions and 8 deletions
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11
fs/nfs/write.c
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@ -230,7 +230,6 @@ static int nfs_set_page_writeback(struct page *page)
struct inode *inode = page->mapping->host;
struct nfs_server *nfss = NFS_SERVER(inode);
page_cache_get(page);
if (atomic_long_inc_return(&nfss->writeback) >
NFS_CONGESTION_ON_THRESH) {
set_bdi_congested(&nfss->backing_dev_info,
@ -246,7 +245,6 @@ static void nfs_end_page_writeback(struct page *page)
struct nfs_server *nfss = NFS_SERVER(inode);
end_page_writeback(page);
page_cache_release(page);
if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
}
@ -607,13 +605,12 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
while (!list_empty(&hdr->pages)) {
struct nfs_page *req = nfs_list_entry(hdr->pages.next);
struct page *page = req->wb_page;
bytes += req->wb_bytes;
nfs_list_remove_request(req);
if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
(hdr->good_bytes < bytes)) {
nfs_set_pageerror(page);
nfs_set_pageerror(req->wb_page);
nfs_context_set_write_error(req->wb_context, hdr->error);
goto remove_req;
}
@ -629,7 +626,7 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
nfs_inode_remove_request(req);
next:
nfs_unlock_request_dont_release(req);
nfs_end_page_writeback(page);
nfs_end_page_writeback(req->wb_page);
nfs_release_request(req);
}
out:
@ -1040,11 +1037,9 @@ static int nfs_do_multiple_writes(struct list_head *head,
*/
static void nfs_redirty_request(struct nfs_page *req)
{
struct page *page = req->wb_page;
nfs_mark_request_dirty(req);
nfs_unlock_request_dont_release(req);
nfs_end_page_writeback(page);
nfs_end_page_writeback(req->wb_page);
nfs_release_request(req);
}