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Commit fc6eabbb authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'nfs-for-4.16-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs 

Pull NFS client bugfixes from Trond Myklebust:
 "Hightlights include the following stable fixes:

   - NFS: Fix an incorrect type in struct nfs_direct_req

   - pNFS: Prevent the layout header refcount going to zero in
     pnfs_roc()

   - NFS: Fix unstable write completion"

* tag 'nfs-for-4.16-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: Fix unstable write completion
  pNFS: Prevent the layout header refcount going to zero in pnfs_roc()
  NFS: Fix an incorrect type in struct nfs_direct_req
parents 0c8efd61 c4f24df9

fs/nfs/direct.c

+1 −1
Original line number Diff line number Diff line
@@ -86,10 +86,10 @@ struct nfs_direct_req { 
	struct nfs_direct_mirror mirrors[NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX];

	int			mirror_count;



	loff_t			io_start;	/* Start offset for I/O */

	ssize_t			count,		/* bytes actually processed */

				max_count,	/* max expected count */

				bytes_left,	/* bytes left to be sent */

				io_start,	/* start of IO */

				error;		/* any reported error */

	struct completion	completion;	/* wait for i/o completion */

fs/nfs/pnfs.c

+10 −3
Original line number Diff line number Diff line
@@ -292,8 +292,11 @@ pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) 
void

pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)

{

	struct inode *inode = lo->plh_inode;

	struct inode *inode;



	if (!lo)

		return;

	inode = lo->plh_inode;

	pnfs_layoutreturn_before_put_layout_hdr(lo);



	if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
@@ -1241,10 +1244,12 @@ bool pnfs_roc(struct inode *ino, 
	spin_lock(&ino->i_lock);

	lo = nfsi->layout;

	if (!lo || !pnfs_layout_is_valid(lo) ||

	    test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))

	    test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {

		lo = NULL;

		goto out_noroc;

	if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {

	}

	pnfs_get_layout_hdr(lo);

	if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {

		spin_unlock(&ino->i_lock);

		wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,

				TASK_UNINTERRUPTIBLE);
@@ -1312,10 +1317,12 @@ bool pnfs_roc(struct inode *ino, 
		struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;

		if (ld->prepare_layoutreturn)

			ld->prepare_layoutreturn(args);

		pnfs_put_layout_hdr(lo);

		return true;

	}

	if (layoutreturn)

		pnfs_send_layoutreturn(lo, &stateid, iomode, true);

	pnfs_put_layout_hdr(lo);

	return false;

}

fs/nfs/write.c

+43 −40
Original line number Diff line number Diff line
@@ -1876,40 +1876,43 @@ int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 
	return status;

}



int nfs_commit_inode(struct inode *inode, int how)

static int __nfs_commit_inode(struct inode *inode, int how,

		struct writeback_control *wbc)

{

	LIST_HEAD(head);

	struct nfs_commit_info cinfo;

	int may_wait = how & FLUSH_SYNC;

	int error = 0;

	int res;

	int ret, nscan;



	nfs_init_cinfo_from_inode(&cinfo, inode);

	nfs_commit_begin(cinfo.mds);

	res = nfs_scan_commit(inode, &head, &cinfo);

	if (res)

		error = nfs_generic_commit_list(inode, &head, how, &cinfo);

	for (;;) {

		ret = nscan = nfs_scan_commit(inode, &head, &cinfo);

		if (ret <= 0)

			break;

		ret = nfs_generic_commit_list(inode, &head, how, &cinfo);

		if (ret < 0)

			break;

		ret = 0;

		if (wbc && wbc->sync_mode == WB_SYNC_NONE) {

			if (nscan < wbc->nr_to_write)

				wbc->nr_to_write -= nscan;

			else

				wbc->nr_to_write = 0;

		}

		if (nscan < INT_MAX)

			break;

		cond_resched();

	}

	nfs_commit_end(cinfo.mds);

	if (res == 0)

		return res;

	if (error < 0)

		goto out_error;

	if (!may_wait)

		goto out_mark_dirty;

	error = wait_on_commit(cinfo.mds);

	if (error < 0)

		return error;

	return res;

out_error:

	res = error;

	/* Note: If we exit without ensuring that the commit is complete,

	 * we must mark the inode as dirty. Otherwise, future calls to

	 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure

	 * that the data is on the disk.

	 */

out_mark_dirty:

	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);

	return res;

	if (ret || !may_wait)

		return ret;

	return wait_on_commit(cinfo.mds);

}



int nfs_commit_inode(struct inode *inode, int how)

{

	return __nfs_commit_inode(inode, how, NULL);

}

EXPORT_SYMBOL_GPL(nfs_commit_inode);
@@ -1919,11 +1922,11 @@ int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 
	int flags = FLUSH_SYNC;

	int ret = 0;



	if (wbc->sync_mode == WB_SYNC_NONE) {

		/* no commits means nothing needs to be done */

		if (!atomic_long_read(&nfsi->commit_info.ncommit))

		return ret;

			goto check_requests_outstanding;



	if (wbc->sync_mode == WB_SYNC_NONE) {

		/* Don't commit yet if this is a non-blocking flush and there

		 * are a lot of outstanding writes for this mapping.

		 */
@@ -1934,16 +1937,16 @@ int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 
		flags = 0;

	}



	ret = nfs_commit_inode(inode, flags);

	if (ret >= 0) {

		if (wbc->sync_mode == WB_SYNC_NONE) {

			if (ret < wbc->nr_to_write)

				wbc->nr_to_write -= ret;

			else

				wbc->nr_to_write = 0;

		}

	ret = __nfs_commit_inode(inode, flags, wbc);

	if (!ret) {

		if (flags & FLUSH_SYNC)

			return 0;

	}

	} else if (atomic_long_read(&nfsi->commit_info.ncommit))

		goto out_mark_dirty;



check_requests_outstanding:

	if (!atomic_read(&nfsi->commit_info.rpcs_out))

		return ret;

out_mark_dirty:

	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);

	return ret;