Both nfs_destroy_unlinked_subrequests() and nfs_lock_and_join_requests()
manipulate the inode flags adjusting the NFS_I(inode)->nrequests.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/write.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index bb38c881fc48..ee981353d4aa 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -418,7 +418,8 @@ nfs_unroll_locks_and_wait(struct inode *inode, struct nfs_page *head,
*/
static void
nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
- struct nfs_page *old_head)
+ struct nfs_page *old_head,
+ struct inode *inode)
{
while (destroy_list) {
struct nfs_page *subreq = destroy_list;
@@ -443,9 +444,12 @@ nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
nfs_page_group_clear_bits(subreq);
/* release the PG_INODE_REF reference */
- if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags))
+ if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) {
nfs_release_request(subreq);
- else
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->nrequests--;
+ spin_unlock(&inode->i_lock);
+ } else
WARN_ON_ONCE(1);
} else {
WARN_ON_ONCE(test_bit(PG_CLEAN, &subreq->wb_flags));
@@ -572,25 +576,24 @@ nfs_lock_and_join_requests(struct page *page)
head->wb_bytes = total_bytes;
}
+ /* Postpone destruction of this request */
+ if (test_and_clear_bit(PG_REMOVE, &head->wb_flags)) {
+ set_bit(PG_INODE_REF, &head->wb_flags);
+ kref_get(&head->wb_kref);
+ NFS_I(inode)->nrequests++;
+ }
+
/*
* prepare head request to be added to new pgio descriptor
*/
nfs_page_group_clear_bits(head);
- /*
- * some part of the group was still on the inode list - otherwise
- * the group wouldn't be involved in async write.
- * grab a reference for the head request, iff it needs one.
- */
- if (!test_and_set_bit(PG_INODE_REF, &head->wb_flags))
- kref_get(&head->wb_kref);
-
nfs_page_group_unlock(head);
/* drop lock to clean uprequests on destroy list */
spin_unlock(&inode->i_lock);
- nfs_destroy_unlinked_subrequests(destroy_list, head);
+ nfs_destroy_unlinked_subrequests(destroy_list, head, inode);
/* still holds ref on head from nfs_page_find_head_request_locked
* and still has lock on head from lock loop */
--
2.13.3
--
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