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authorWeston Andros Adamson <dros@primarydata.com>2014-05-15 19:56:43 +0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-05-29 19:11:43 +0400
commitb4fdac1a5150174df0847a45dc6612ce5ce3daeb (patch)
tree477f3dc72760a8ff622934723c4a984cd4c9ce5d /fs/nfs/blocklayout
parent8c8f1ac109726e4ed44a920f5c962c84610d4a17 (diff)
downloadlinux-b4fdac1a5150174df0847a45dc6612ce5ce3daeb.tar.xz
nfs: modify pg_test interface to return size_t
This is a step toward allowing pg_test to inform the the coalescing code to reduce the size of requests so they may fit in whatever scheme the pg_test callback wants to define. For now, just return the size of the request if there is space, or 0 if there is not. This shouldn't change any behavior as it acts the same as when the pg_test functions returned bool. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/blocklayout')
-rw-r--r--fs/nfs/blocklayout/blocklayout.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 206cc68c9694..9b431f44fad9 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -1189,13 +1189,17 @@ bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
pnfs_generic_pg_init_read(pgio, req);
}
-static bool
+/*
+ * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
+ * of bytes (maximum @req->wb_bytes) that can be coalesced.
+ */
+static size_t
bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
if (pgio->pg_dreq != NULL &&
!is_aligned_req(req, SECTOR_SIZE))
- return false;
+ return 0;
return pnfs_generic_pg_test(pgio, prev, req);
}
@@ -1241,13 +1245,17 @@ bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
}
}
-static bool
+/*
+ * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
+ * of bytes (maximum @req->wb_bytes) that can be coalesced.
+ */
+static size_t
bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
if (pgio->pg_dreq != NULL &&
!is_aligned_req(req, PAGE_CACHE_SIZE))
- return false;
+ return 0;
return pnfs_generic_pg_test(pgio, prev, req);
}