From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/pagelist.c | 5 +++--
include/linux/nfs_page.h | 38 +++++++++++++++++++++++++++++++++++++-
2 files changed, 40 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index b4b3e80e64cd..f496774d9d97 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -500,9 +500,10 @@ nfs_create_subreq(struct nfs_page *req,
{
struct nfs_page *last;
struct nfs_page *ret;
+ struct page *page = nfs_page_to_page(req, pgbase);
- ret = __nfs_create_request(req->wb_lock_context, req->wb_page,
- pgbase, offset, count);
+ ret = __nfs_create_request(req->wb_lock_context, page, pgbase, offset,
+ count);
if (!IS_ERR(ret)) {
/* find the last request */
for (last = req->wb_head;
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index ba7e2e4b0926..d2ddc9a594c5 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -25,6 +25,7 @@
enum {
PG_BUSY = 0, /* nfs_{un}lock_request */
PG_MAPPED, /* page private set for buffered io */
+ PG_FOLIO, /* Tracking a folio (unset for O_DIRECT) */
PG_CLEAN, /* write succeeded */
PG_COMMIT_TO_DS, /* used by pnfs layouts */
PG_INODE_REF, /* extra ref held by inode when in writeback */
@@ -41,7 +42,10 @@ enum {
struct nfs_inode;
struct nfs_page {
struct list_head wb_list; /* Defines state of page: */
- struct page *wb_page; /* page to read in/write out */
+ union {
+ struct page *wb_page; /* page to read in/write out */
+ struct folio *wb_folio;
+ };
struct nfs_lock_context *wb_lock_context; /* lock context info */
pgoff_t wb_index; /* Offset >> PAGE_SHIFT */
unsigned int wb_offset, /* Offset & ~PAGE_MASK */
@@ -153,6 +157,38 @@ extern int nfs_page_set_headlock(struct nfs_page *req);
extern void nfs_page_clear_headlock(struct nfs_page *req);
extern bool nfs_async_iocounter_wait(struct rpc_task *, struct nfs_lock_context *);
+/**
+ * nfs_page_to_folio - Retrieve a struct folio for the request
+ * @req: pointer to a struct nfs_page
+ *
+ * If a folio was assigned to @req, then return it, otherwise return NULL.
+ */
+static inline struct folio *nfs_page_to_folio(const struct nfs_page *req)
+{
+ if (test_bit(PG_FOLIO, &req->wb_flags))
+ return req->wb_folio;
+ return NULL;
+}
+
+/**
+ * nfs_page_to_page - Retrieve a struct page for the request
+ * @req: pointer to a struct nfs_page
+ * @pgbase: folio byte offset
+ *
+ * Return the page containing the byte that is at offset @pgbase relative
+ * to the start of the folio.
+ * Note: The request starts at offset @req->wb_pgbase.
+ */
+static inline struct page *nfs_page_to_page(const struct nfs_page *req,
+ size_t pgbase)
+{
+ struct folio *folio = nfs_page_to_folio(req);
+
+ if (folio == NULL)
+ return req->wb_page;
+ return folio_page(folio, pgbase >> PAGE_SHIFT);
+}
+
/*
* Lock the page of an asynchronous request
*/
--
2.39.0
