Patch "NFS: Use GFP_NOIO for two allocations in writeback" has been added to the 4.9-stable tree

Patch "NFS: Use GFP_NOIO for two allocations in writeback" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    NFS: Use GFP_NOIO for two allocations in writeback

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfs-use-gfp_noio-for-two-allocations-in-writeback.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From ae97aa524ef495b6276fd26f5d5449fb22975d7c Mon Sep 17 00:00:00 2001
From: Benjamin Coddington <bcodding@redhat.com>
Date: Wed, 19 Apr 2017 10:11:33 -0400
Subject: NFS: Use GFP_NOIO for two allocations in writeback

From: Benjamin Coddington <bcodding@redhat.com>

commit ae97aa524ef495b6276fd26f5d5449fb22975d7c upstream.

Prevent a deadlock that can occur if we wait on allocations
that try to write back our pages.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Fixes: 00bfa30abe869 ("NFS: Create a common pgio_alloc and pgio_release...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfs/pagelist.c |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -29,13 +29,14 @@
 static struct kmem_cache *nfs_page_cachep;
 static const struct rpc_call_ops nfs_pgio_common_ops;
 
-static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
+static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount,
+					gfp_t gfp_flags)
 {
 	p->npages = pagecount;
 	if (pagecount <= ARRAY_SIZE(p->page_array))
 		p->pagevec = p->page_array;
 	else {
-		p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
+		p->pagevec = kcalloc(pagecount, sizeof(struct page *), gfp_flags);
 		if (!p->pagevec)
 			p->npages = 0;
 	}
@@ -681,6 +682,7 @@ void nfs_pageio_init(struct nfs_pageio_d
 {
 	struct nfs_pgio_mirror *new;
 	int i;
+	gfp_t gfp_flags = GFP_KERNEL;
 
 	desc->pg_moreio = 0;
 	desc->pg_inode = inode;
@@ -700,8 +702,10 @@ void nfs_pageio_init(struct nfs_pageio_d
 	if (pg_ops->pg_get_mirror_count) {
 		/* until we have a request, we don't have an lseg and no
 		 * idea how many mirrors there will be */
+		if (desc->pg_rw_ops->rw_mode == FMODE_WRITE)
+			gfp_flags = GFP_NOIO;
 		new = kcalloc(NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX,
-			      sizeof(struct nfs_pgio_mirror), GFP_KERNEL);
+			      sizeof(struct nfs_pgio_mirror), gfp_flags);
 		desc->pg_mirrors_dynamic = new;
 		desc->pg_mirrors = new;
 
@@ -755,9 +759,12 @@ int nfs_generic_pgio(struct nfs_pageio_d
 	struct list_head *head = &mirror->pg_list;
 	struct nfs_commit_info cinfo;
 	unsigned int pagecount, pageused;
+	gfp_t gfp_flags = GFP_KERNEL;
 
 	pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count);
-	if (!nfs_pgarray_set(&hdr->page_array, pagecount)) {
+	if (desc->pg_rw_ops->rw_mode == FMODE_WRITE)
+		gfp_flags = GFP_NOIO;
+	if (!nfs_pgarray_set(&hdr->page_array, pagecount, gfp_flags)) {
 		nfs_pgio_error(hdr);
 		desc->pg_error = -ENOMEM;
 		return desc->pg_error;


Patches currently in stable-queue which might be from bcodding@redhat.com are

queue-4.9/nfs-use-gfp_noio-for-two-allocations-in-writeback.patch