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NFS: Add nfs_set_page_dirty()

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We will want to allow nfs_writepage() to distinguish between pages that
have been marked as dirty by the VM, and those that have been marked as
dirty by nfs_updatepage().
In the former case, the entire page will want to be written out, and so any
requests that were pending need to be flushed out first.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-12-05 00:35:40 -05:00
parent 200baa2112
commit 1a54533ec8
4 changed files with 39 additions and 14 deletions
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2
fs/nfs/file.c
View File

@ -331,7 +331,7 @@ static int nfs_release_page(struct page *page, gfp_t gfp)
const struct address_space_operations nfs_file_aops = {
.readpage = nfs_readpage,
.readpages = nfs_readpages,
.set_page_dirty = __set_page_dirty_nobuffers,
.set_page_dirty = nfs_set_page_dirty,
.writepage = nfs_writepage,
.writepages = nfs_writepages,
.prepare_write = nfs_prepare_write,

49
fs/nfs/write.c
View File

@ -251,16 +251,23 @@ int nfs_writepage(struct page *page, struct writeback_control *wbc)
{
struct nfs_open_context *ctx;
struct inode *inode = page->mapping->host;
struct nfs_page *req;
unsigned offset;
int err;
int err = 0;
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
/* Ensure we've flushed out any previous writes */
nfs_wb_page_priority(inode, page, wb_priority(wbc));
req = nfs_page_find_request(page);
if (req != NULL) {
int flushme = test_bit(PG_NEED_FLUSH, &req->wb_flags);
nfs_release_request(req);
if (!flushme)
goto out;
/* Ensure we've flushed out the invalid write */
nfs_wb_page_priority(inode, page, wb_priority(wbc));
}
err = 0;
offset = nfs_page_length(page);
if (!offset)
goto out;
@ -655,7 +662,7 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
{
struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
struct nfs_page *req;
int status = 0;
int do_flush, status;
/*
* Look for a request corresponding to this page. If there
* is one, and it belongs to another file, we flush it out
@ -664,15 +671,18 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
* Also do the same if we find a request from an existing
* dropped page.
*/
req = nfs_page_find_request(page);
if (req != NULL) {
int do_flush = req->wb_page != page || req->wb_context != ctx;
do {
req = nfs_page_find_request(page);
if (req == NULL)
return 0;
do_flush = req->wb_page != page || req->wb_context != ctx
|| test_bit(PG_NEED_FLUSH, &req->wb_flags);
nfs_release_request(req);
if (do_flush)
status = nfs_wb_page(page->mapping->host, page);
}
return (status < 0) ? status : 0;
if (!do_flush)
return 0;
status = nfs_wb_page(page->mapping->host, page);
} while (status == 0);
return status;
}
/*
@ -1437,6 +1447,19 @@ int nfs_wb_page(struct inode *inode, struct page* page)
return nfs_wb_page_priority(inode, page, 0);
}
int nfs_set_page_dirty(struct page *page)
{
struct nfs_page *req;
req = nfs_page_find_request(page);
if (req != NULL) {
/* Mark any existing write requests for flushing */
set_bit(PG_NEED_FLUSH, &req->wb_flags);
nfs_release_request(req);
}
return __set_page_dirty_nobuffers(page);
}
int __init nfs_init_writepagecache(void)
{

1
include/linux/nfs_fs.h
View File

@ -427,6 +427,7 @@ extern int nfs_flush_incompatible(struct file *file, struct page *page);
extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
extern void nfs_writedata_release(void *);
extern int nfs_set_page_dirty(struct page *);
/*
* Try to write back everything synchronously (but check the

1
include/linux/nfs_page.h
View File

@ -30,6 +30,7 @@
#define PG_BUSY 0
#define PG_NEED_COMMIT 1
#define PG_NEED_RESCHED 2
#define PG_NEED_FLUSH 3
struct nfs_inode;
struct nfs_page {