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Diffstat (limited to 'fs/nfs/nfs4filelayout.c')
-rw-r--r--fs/nfs/nfs4filelayout.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 23f930caf1e2..0efe8cbd9e3c 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -252,6 +252,31 @@ filelayout_free_lseg(struct pnfs_layout_segment *lseg)
_filelayout_free_lseg(fl);
}
+/*
+ * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
+ *
+ * return 1 : coalesce page
+ * return 0 : don't coalesce page
+ */
+int
+filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
+ struct nfs_page *req)
+{
+ u64 p_stripe, r_stripe;
+ u32 stripe_unit;
+
+ if (!pgio->pg_lseg)
+ return 1;
+ p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
+ r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
+ stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
+
+ do_div(p_stripe, stripe_unit);
+ do_div(r_stripe, stripe_unit);
+
+ return (p_stripe == r_stripe);
+}
+
static struct pnfs_layoutdriver_type filelayout_type = {
.id = LAYOUT_NFSV4_1_FILES,
.name = "LAYOUT_NFSV4_1_FILES",
@@ -260,6 +285,7 @@ static struct pnfs_layoutdriver_type filelayout_type = {
.clear_layoutdriver = filelayout_clear_layoutdriver,
.alloc_lseg = filelayout_alloc_lseg,
.free_lseg = filelayout_free_lseg,
+ .pg_test = filelayout_pg_test,
};
static int __init nfs4filelayout_init(void)