We only have two places where we need to grab a reference when trying
to lock the nfs_page. We're better off making that explicit.
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Cc: Fred Isaman <iisaman@xxxxxxxxxx>
---
fs/nfs/direct.c | 1 +
fs/nfs/write.c | 11 ++++++-----
include/linux/nfs_page.h | 14 ++------------
3 files changed, 9 insertions(+), 17 deletions(-)
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 257d009..465ea84 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -657,6 +657,7 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_pageio_descriptor *d
break;
}
nfs_lock_request(req);
+ kref_get(&req->wb_kref);
req->wb_index = pos >> PAGE_SHIFT;
req->wb_offset = pos & ~PAGE_MASK;
if (!nfs_pageio_add_request(desc, req)) {
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 8382329..553f7ef 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -260,10 +260,10 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblo
req = nfs_page_find_request_locked(page);
if (req == NULL)
break;
- if (nfs_lock_request_dontget(req))
+ if (nfs_lock_request(req))
break;
/* Note: If we hold the page lock, as is the case in nfs_writepage,
- * then the call to nfs_lock_request_dontget() will always
+ * then the call to nfs_lock_request() will always
* succeed provided that someone hasn't already marked the
* request as dirty (in which case we don't care).
*/
@@ -406,7 +406,7 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
struct nfs_inode *nfsi = NFS_I(inode);
/* Lock the request! */
- nfs_lock_request_dontget(req);
+ nfs_lock_request(req);
spin_lock(&inode->i_lock);
if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE))
@@ -651,6 +651,7 @@ nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
list_for_each_entry_safe(req, tmp, src, wb_list) {
if (!nfs_lock_request(req))
continue;
+ kref_get(&req->wb_kref);
if (cond_resched_lock(cinfo->lock))
list_safe_reset_next(req, tmp, wb_list);
nfs_request_remove_commit_list(req, cinfo);
@@ -741,7 +742,7 @@ static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
|| end < req->wb_offset)
goto out_flushme;
- if (nfs_lock_request_dontget(req))
+ if (nfs_lock_request(req))
break;
/* The request is locked, so wait and then retry */
@@ -1717,7 +1718,7 @@ int nfs_wb_page_cancel(struct inode *inode, struct page *page)
req = nfs_page_find_request(page);
if (req == NULL)
break;
- if (nfs_lock_request_dontget(req)) {
+ if (nfs_lock_request(req)) {
nfs_clear_request_commit(req);
nfs_inode_remove_request(req);
/*
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index ef75042..263f30a 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -99,24 +99,14 @@ extern void nfs_unlock_request(struct nfs_page *req);
extern void nfs_unlock_request_dont_release(struct nfs_page *req);
/*
- * Lock the page of an asynchronous request without getting a new reference
+ * Lock the page of an asynchronous request
*/
static inline int
-nfs_lock_request_dontget(struct nfs_page *req)
-{
- return !test_and_set_bit(PG_BUSY, &req->wb_flags);
-}
-
-static inline int
nfs_lock_request(struct nfs_page *req)
{
- if (test_and_set_bit(PG_BUSY, &req->wb_flags))
- return 0;
- kref_get(&req->wb_kref);
- return 1;
+ return !test_and_set_bit(PG_BUSY, &req->wb_flags);
}
-
/**
* nfs_list_add_request - Insert a request into a list
* @req: request
--
1.7.7.6
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
