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authorBenny Halevy <bhalevy@panasas.com>2011-05-22 19:47:26 +0300
committerBoaz Harrosh <bharrosh@panasas.com>2011-05-29 20:52:32 +0300
commitfb3296eb4636763918edef2d22e45b85b15d4518 (patch)
tree31c85255ccfa03cbca2d1e4e52028e489276a73b /fs/nfs/read.c
parentf7da7a129d57bfe0f74573dc03531c63e1360fae (diff)
pnfs: Use byte-range for layoutget
Add offset and count parameters to pnfs_update_layout and use them to get the layout in the pageio path. Order cache layout segments in the following order: * offset (ascending) * length (descending) * iomode (RW before READ) Test byte range against the layout segment in use in pnfs_{read,write}_pg_test so not to coalesce pages not using the same layout segment. [fix lseg ordering] [clean up pnfs_find_lseg lseg arg] [remove unnecessary FIXME] [fix ordering in pnfs_insert_layout] [clean up pnfs_insert_layout] Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Diffstat (limited to 'fs/nfs/read.c')
-rw-r--r--fs/nfs/read.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 2bcf0dc306a..540c8bc93f9 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -288,7 +288,9 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc)
atomic_set(&req->wb_complete, requests);
BUG_ON(desc->pg_lseg != NULL);
- lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_READ, GFP_KERNEL);
+ lseg = pnfs_update_layout(desc->pg_inode, req->wb_context,
+ req_offset(req), desc->pg_count,
+ IOMODE_READ, GFP_KERNEL);
ClearPageError(page);
offset = 0;
nbytes = desc->pg_count;
@@ -351,7 +353,9 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc)
}
req = nfs_list_entry(data->pages.next);
if ((!lseg) && list_is_singular(&data->pages))
- lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_READ, GFP_KERNEL);
+ lseg = pnfs_update_layout(desc->pg_inode, req->wb_context,
+ req_offset(req), desc->pg_count,
+ IOMODE_READ, GFP_KERNEL);
ret = nfs_read_rpcsetup(req, data, &nfs_read_full_ops, desc->pg_count,
0, lseg);