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NFS: Make nfs_updatepage() mark the page as dirty.

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This will ensure that we can call set_page_writeback() from within
nfs_writepage(), which is always called with the page lock set.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-12-05 00:35:41 -05:00
parent 4d770ccf42
commit e261f51f25
2 changed files with 57 additions and 17 deletions
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73
fs/nfs/write.c
View file

@ -77,6 +77,7 @@
static struct nfs_page * nfs_update_request(struct nfs_open_context*,
struct page *,
unsigned int, unsigned int);
static void nfs_mark_request_dirty(struct nfs_page *req);
static int nfs_wait_on_write_congestion(struct address_space *, int);
static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int);
static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how);
@ -244,6 +245,48 @@ static int wb_priority(struct writeback_control *wbc)
return 0;
}
/*
* Find an associated nfs write request, and prepare to flush it out
* Returns 1 if there was no write request, or if the request was
* already tagged by nfs_set_page_dirty.Returns 0 if the request
* was not tagged.
* May also return an error if the user signalled nfs_wait_on_request().
*/
static int nfs_page_mark_flush(struct page *page)
{
struct nfs_page *req;
spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
int ret;
spin_lock(req_lock);
for(;;) {
req = nfs_page_find_request_locked(page);
if (req == NULL) {
spin_unlock(req_lock);
return 1;
}
if (nfs_lock_request_dontget(req))
break;
/* Note: If we hold the page lock, as is the case in nfs_writepage,
* then the call to nfs_lock_request_dontget() will always
* succeed provided that someone hasn't already marked the
* request as dirty (in which case we don't care).
*/
spin_unlock(req_lock);
ret = nfs_wait_on_request(req);
nfs_release_request(req);
if (ret != 0)
return ret;
spin_lock(req_lock);
}
spin_unlock(req_lock);
if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0)
nfs_mark_request_dirty(req);
ret = test_bit(PG_NEED_FLUSH, &req->wb_flags);
nfs_unlock_request(req);
return ret;
}
/*
* Write an mmapped page to the server.
*/
@ -251,23 +294,16 @@ static int nfs_writepage_locked(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 = 0;
int err;
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
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) | FLUSH_STABLE | FLUSH_NOWRITEPAGE);
}
err = nfs_page_mark_flush(page);
if (err <= 0)
goto out;
err = 0;
offset = nfs_page_length(page);
if (!offset)
goto out;
@ -279,7 +315,11 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc
}
err = nfs_writepage_setup(ctx, page, 0, offset);
put_nfs_open_context(ctx);
if (err != 0)
goto out;
err = nfs_page_mark_flush(page);
if (err > 0)
err = 0;
out:
if (!wbc->for_writepages)
nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc));
@ -409,8 +449,7 @@ nfs_mark_request_dirty(struct nfs_page *req)
static inline int
nfs_dirty_request(struct nfs_page *req)
{
struct nfs_inode *nfsi = NFS_I(req->wb_context->dentry->d_inode);
return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty;
return test_bit(PG_FLUSHING, &req->wb_flags) == 0;
}
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
@ -628,7 +667,6 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
return ERR_PTR(error);
}
spin_unlock(&nfsi->req_lock);
nfs_mark_request_dirty(new);
return new;
}
spin_unlock(&nfsi->req_lock);
@ -684,7 +722,7 @@ int nfs_flush_incompatible(struct file *file, struct page *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_dirty_request(req);
nfs_release_request(req);
if (!do_flush)
return 0;
@ -723,6 +761,7 @@ int nfs_updatepage(struct file *file, struct page *page,
}
status = nfs_writepage_setup(ctx, page, offset, count);
__set_page_dirty_nobuffers(page);
dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
status, (long long)i_size_read(inode));

1
include/linux/nfs_page.h
View file

@ -31,6 +31,7 @@
#define PG_NEED_COMMIT 1
#define PG_NEED_RESCHED 2
#define PG_NEED_FLUSH 3
#define PG_FLUSHING 4
struct nfs_inode;
struct nfs_page {