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Commit d333fc8d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'fixes' of git://git.linux-nfs.org/pub/linux/nfs-2.6 

* 'fixes' of git://git.linux-nfs.org/pub/linux/nfs-2.6:
  NFS: Fix nfs_direct_dirty_pages()
  NFS: Fix handful of compiler warnings in direct.c
  NFS: Avoid a deadlock situation on write
parents 1a93fa86 d4a8f367

fs/nfs/direct.c

+33 −20
Original line number Diff line number Diff line
@@ -122,19 +122,25 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_ 
	return -EINVAL;

}



static void nfs_direct_dirty_pages(struct page **pages, int npages)

static void nfs_direct_dirty_pages(struct page **pages, unsigned int pgbase, size_t count)

{

	int i;

	unsigned int npages;

	unsigned int i;



	if (count == 0)

		return;

	pages += (pgbase >> PAGE_SHIFT);

	npages = (count + (pgbase & ~PAGE_MASK) + PAGE_SIZE - 1) >> PAGE_SHIFT;

	for (i = 0; i < npages; i++) {

		struct page *page = pages[i];

		if (!PageCompound(page))

			set_page_dirty_lock(page);

			set_page_dirty(page);

	}

}



static void nfs_direct_release_pages(struct page **pages, int npages)

static void nfs_direct_release_pages(struct page **pages, unsigned int npages)

{

	int i;

	unsigned int i;

	for (i = 0; i < npages; i++)

		page_cache_release(pages[i]);

}
@@ -224,17 +230,18 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata) 
	if (nfs_readpage_result(task, data) != 0)

		return;



	nfs_direct_dirty_pages(data->pagevec, data->npages);

	nfs_direct_release_pages(data->pagevec, data->npages);



	spin_lock(&dreq->lock);



	if (likely(task->tk_status >= 0))

		dreq->count += data->res.count;

	else

	if (unlikely(task->tk_status < 0)) {

		dreq->error = task->tk_status;



		spin_unlock(&dreq->lock);

	} else {

		dreq->count += data->res.count;

		spin_unlock(&dreq->lock);

		nfs_direct_dirty_pages(data->pagevec,

				data->args.pgbase,

				data->res.count);

	}

	nfs_direct_release_pages(data->pagevec, data->npages);



	if (put_dreq(dreq))

		nfs_direct_complete(dreq);
@@ -279,8 +286,11 @@ static ssize_t nfs_direct_read_schedule(struct nfs_direct_req *dreq, unsigned lo 
		result = get_user_pages(current, current->mm, user_addr,

					data->npages, 1, 0, data->pagevec, NULL);

		up_read(&current->mm->mmap_sem);

		if (unlikely(result < data->npages)) {

			if (result > 0)

		if (result < 0) {

			nfs_readdata_release(data);

			break;

		}

		if ((unsigned)result < data->npages) {

			nfs_direct_release_pages(data->pagevec, result);

			nfs_readdata_release(data);

			break;
@@ -610,8 +620,11 @@ static ssize_t nfs_direct_write_schedule(struct nfs_direct_req *dreq, unsigned l 
		result = get_user_pages(current, current->mm, user_addr,

					data->npages, 0, 0, data->pagevec, NULL);

		up_read(&current->mm->mmap_sem);

		if (unlikely(result < data->npages)) {

			if (result > 0)

		if (result < 0) {

			nfs_writedata_release(data);

			break;

		}

		if ((unsigned)result < data->npages) {

			nfs_direct_release_pages(data->pagevec, result);

			nfs_writedata_release(data);

			break;

fs/nfs/pagelist.c

+20 −0
Original line number Diff line number Diff line
@@ -355,6 +355,26 @@ void nfs_pageio_complete(struct nfs_pageio_descriptor *desc) 
	nfs_pageio_doio(desc);

}



/**

 * nfs_pageio_cond_complete - Conditional I/O completion

 * @desc: pointer to io descriptor

 * @index: page index

 *

 * It is important to ensure that processes don't try to take locks

 * on non-contiguous ranges of pages as that might deadlock. This

 * function should be called before attempting to wait on a locked

 * nfs_page. It will complete the I/O if the page index 'index'

 * is not contiguous with the existing list of pages in 'desc'.

 */

void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)

{

	if (!list_empty(&desc->pg_list)) {

		struct nfs_page *prev = nfs_list_entry(desc->pg_list.prev);

		if (index != prev->wb_index + 1)

			nfs_pageio_doio(desc);

	}

}



#define NFS_SCAN_MAXENTRIES 16

/**

 * nfs_scan_list - Scan a list for matching requests

fs/nfs/write.c

+4 −2
Original line number Diff line number Diff line
@@ -273,8 +273,6 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 
		 *	 request as dirty (in which case we don't care).

		 */

		spin_unlock(req_lock);

		/* Prevent deadlock! */

		nfs_pageio_complete(pgio);

		ret = nfs_wait_on_request(req);

		nfs_release_request(req);

		if (ret != 0)
@@ -321,6 +319,8 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc 
		pgio = &mypgio;

	}



	nfs_pageio_cond_complete(pgio, page->index);



	err = nfs_page_async_flush(pgio, page);

	if (err <= 0)

		goto out;
@@ -329,6 +329,8 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc 
	if (!offset)

		goto out;



	nfs_pageio_cond_complete(pgio, page->index);



	ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE);

	if (ctx == NULL) {

		err = -EBADF;

include/linux/nfs_page.h

+1 −0
Original line number Diff line number Diff line
@@ -81,6 +81,7 @@ extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc, 
extern	int nfs_pageio_add_request(struct nfs_pageio_descriptor *,

				   struct nfs_page *);

extern	void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);

extern	void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t);

extern  int nfs_wait_on_request(struct nfs_page *);

extern	void nfs_unlock_request(struct nfs_page *req);

extern  int nfs_set_page_writeback_locked(struct nfs_page *req);