From 2ce209c42c01ca976ad680fea52a8e8b9a53643b Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 1 Aug 2017 17:29:29 -0400 Subject: NFS: Wait for requests that are locked on the commit list If a request is on the commit list, but is locked, we will currently skip it, which can lead to livelocking when the commit count doesn't reduce to zero. Signed-off-by: Trond Myklebust --- fs/nfs/write.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'fs/nfs/write.c') diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 866702823869..5dd3b212376e 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1030,13 +1030,22 @@ int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, struct nfs_commit_info *cinfo, int max) { - struct nfs_page *req, *tmp; + struct nfs_page *req; int ret = 0; - list_for_each_entry_safe(req, tmp, src, wb_list) { - if (!nfs_lock_request(req)) - continue; + while(!list_empty(src)) { + req = list_first_entry(src, struct nfs_page, wb_list); kref_get(&req->wb_kref); + if (!nfs_lock_request(req)) { + int status; + mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); + status = nfs_wait_on_request(req); + nfs_release_request(req); + mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); + if (status < 0) + break; + continue; + } nfs_request_remove_commit_list(req, cinfo); nfs_list_add_request(req, dst); ret++; -- cgit v1.2.3