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NFS: Wait for requests that are locked on the commit list

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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 <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2017-08-01 17:29:29 -04:00
parent 8205b9ce03
commit 2ce209c42c
3 changed files with 29 additions and 8 deletions
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18
fs/nfs/pnfs_nfs.c
View File

@ -91,13 +91,23 @@ static int
pnfs_generic_transfer_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);
clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
nfs_list_add_request(req, dst);