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-rw-r--r--drivers/md/md.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 31d2d70849b6..0418b29945e7 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -723,4 +723,54 @@ static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio)
#define RESYNC_BLOCK_SIZE (64*1024)
#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
+/* for managing resync I/O pages */
+struct resync_pages {
+ unsigned idx; /* for get/put page from the pool */
+ void *raid_bio;
+ struct page *pages[RESYNC_PAGES];
+};
+
+static inline int resync_alloc_pages(struct resync_pages *rp,
+ gfp_t gfp_flags)
+{
+ int i;
+
+ for (i = 0; i < RESYNC_PAGES; i++) {
+ rp->pages[i] = alloc_page(gfp_flags);
+ if (!rp->pages[i])
+ goto out_free;
+ }
+
+ return 0;
+
+out_free:
+ while (--i >= 0)
+ put_page(rp->pages[i]);
+ return -ENOMEM;
+}
+
+static inline void resync_free_pages(struct resync_pages *rp)
+{
+ int i;
+
+ for (i = 0; i < RESYNC_PAGES; i++)
+ put_page(rp->pages[i]);
+}
+
+static inline void resync_get_all_pages(struct resync_pages *rp)
+{
+ int i;
+
+ for (i = 0; i < RESYNC_PAGES; i++)
+ get_page(rp->pages[i]);
+}
+
+static inline struct page *resync_fetch_page(struct resync_pages *rp,
+ unsigned idx)
+{
+ if (WARN_ON_ONCE(idx >= RESYNC_PAGES))
+ return NULL;
+ return rp->pages[idx];
+}
+
#endif /* _MD_MD_H */