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authorWeston Andros Adamson <dros@primarydata.com>2014-07-17 20:42:15 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-08-03 17:05:24 -0400
commite7029206ff43f6cf7d6fcb741adb126f47200516 (patch)
tree177e5c715690fdc397a2054c48ec61b9b5cbbea4 /fs/nfs
parentec25422c669d38f4e8a83da7f77950094349de48 (diff)
downloadlinux-e7029206ff43f6cf7d6fcb741adb126f47200516.tar.bz2
nfs: check wait_on_bit_lock err in page_group_lock
Return errors from wait_on_bit_lock from nfs_page_group_lock. Add a bool argument @wait to nfs_page_group_lock. If true, loop over wait_on_bit_lock until it returns cleanly. If false, return the error from wait_on_bit_lock. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/pagelist.c29
-rw-r--r--fs/nfs/write.c6
2 files changed, 27 insertions, 8 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index e76a40e298f2..9425118e91d7 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -147,17 +147,25 @@ static int nfs_wait_bit_uninterruptible(void *word)
* @req - request in group that is to be locked
*
* this lock must be held if modifying the page group list
+ *
+ * returns result from wait_on_bit_lock: 0 on success, < 0 on error
*/
-void
-nfs_page_group_lock(struct nfs_page *req)
+int
+nfs_page_group_lock(struct nfs_page *req, bool wait)
{
struct nfs_page *head = req->wb_head;
+ int ret;
WARN_ON_ONCE(head != head->wb_head);
- wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK,
+ do {
+ ret = wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK,
nfs_wait_bit_uninterruptible,
TASK_UNINTERRUPTIBLE);
+ } while (wait && ret != 0);
+
+ WARN_ON_ONCE(ret > 0);
+ return ret;
}
/*
@@ -218,7 +226,7 @@ bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit)
{
bool ret;
- nfs_page_group_lock(req);
+ nfs_page_group_lock(req, true);
ret = nfs_page_group_sync_on_bit_locked(req, bit);
nfs_page_group_unlock(req);
@@ -858,8 +866,13 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *subreq;
unsigned int bytes_left = 0;
unsigned int offset, pgbase;
+ int ret;
- nfs_page_group_lock(req);
+ ret = nfs_page_group_lock(req, false);
+ if (ret < 0) {
+ desc->pg_error = ret;
+ return 0;
+ }
subreq = req;
bytes_left = subreq->wb_bytes;
@@ -881,7 +894,11 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
if (desc->pg_recoalesce)
return 0;
/* retry add_request for this subreq */
- nfs_page_group_lock(req);
+ ret = nfs_page_group_lock(req, false);
+ if (ret < 0) {
+ desc->pg_error = ret;
+ return 0;
+ }
continue;
}
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index d357728ed8ba..8d1ed2b9c16c 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -216,7 +216,7 @@ static bool nfs_page_group_covers_page(struct nfs_page *req)
unsigned int pos = 0;
unsigned int len = nfs_page_length(req->wb_page);
- nfs_page_group_lock(req);
+ nfs_page_group_lock(req, true);
do {
tmp = nfs_page_group_search_locked(req->wb_head, pos);
@@ -456,7 +456,9 @@ try_again:
}
/* lock each request in the page group */
- nfs_page_group_lock(head);
+ ret = nfs_page_group_lock(head, false);
+ if (ret < 0)
+ return ERR_PTR(ret);
subreq = head;
do {
/*