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authorTrond Myklebust <trond.myklebust@hammerspace.com>2021-05-25 10:23:05 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2021-05-26 06:36:13 -0400
commit56517ab958b7c11030e626250c00b9b1a24b41eb (patch)
tree9cfb4e7a5e6bca35bb48d3ff9c8b84d9e34b7e12 /fs
parente86be3a04bc4aeaf12f93af35f08f8d4385bcd98 (diff)
NFS: Fix an Oopsable condition in __nfs_pageio_add_request()
Ensure that nfs_pageio_error_cleanup() resets the mirror array contents, so that the structure reflects the fact that it is now empty. Also change the test in nfs_pageio_do_add_request() to be more robust by checking whether or not the list is empty rather than relying on the value of pg_count. Fixes: a7d42ddb3099 ("nfs: add mirroring support to pgio layer") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/pagelist.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 6c20b28d9d7c..d35c84af44e0 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -1094,15 +1094,16 @@ nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *prev = NULL;
unsigned int size;
- if (mirror->pg_count != 0) {
- prev = nfs_list_entry(mirror->pg_list.prev);
- } else {
+ if (list_empty(&mirror->pg_list)) {
if (desc->pg_ops->pg_init)
desc->pg_ops->pg_init(desc, req);
if (desc->pg_error < 0)
return 0;
mirror->pg_base = req->wb_pgbase;
- }
+ mirror->pg_count = 0;
+ mirror->pg_recoalesce = 0;
+ } else
+ prev = nfs_list_entry(mirror->pg_list.prev);
if (desc->pg_maxretrans && req->wb_nio > desc->pg_maxretrans) {
if (NFS_SERVER(desc->pg_inode)->flags & NFS_MOUNT_SOFTERR)

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