By default, unless pnfs is used coalesce pages until pg_bsize
(rsize or wsize) is reached.
pnfs layout drivers define their own pg_test methods that use
pnfs_generic_pg_test and need to define their own I/O size
limits (e.g. based on the file stripe size).
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
fs/nfs/pagelist.c | 17 +++++++----------
1 files changed, 7 insertions(+), 10 deletions(-)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 5344371..36bb67f 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -204,6 +204,11 @@ nfs_wait_on_request(struct nfs_page *req)
TASK_UNINTERRUPTIBLE);
}
+static bool nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, struct nfs_page *prev, struct nfs_page *req)
+{
+ return desc->pg_count + req->wb_bytes <= desc->pg_bsize;
+}
+
/**
* nfs_pageio_init - initialise a page io descriptor
* @desc: pointer to descriptor
@@ -229,7 +234,7 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
desc->pg_ioflags = io_flags;
desc->pg_error = 0;
desc->pg_lseg = NULL;
- desc->pg_test = NULL;
+ desc->pg_test = nfs_generic_pg_test;
pnfs_pageio_init(desc, inode);
}
@@ -260,13 +265,7 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
return false;
if (prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE)
return false;
- /*
- * Non-whole file layouts need to check that req is inside of
- * pgio->pg_lseg.
- */
- if (pgio->pg_test && !pgio->pg_test(pgio, prev, req))
- return false;
- return true;
+ return pgio->pg_test(pgio, prev, req);
}
/**
@@ -295,8 +294,6 @@ static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
if (desc->pg_bsize < PAGE_SIZE)
return 0;
newlen += desc->pg_count;
- if (newlen > desc->pg_bsize)
- return 0;
prev = nfs_list_entry(desc->pg_list.prev);
if (!nfs_can_coalesce_requests(prev, req, desc))
return 0;
--
1.7.2.3
--
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