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authorTrond Myklebust <Trond.Myklebust@netapp.com>2011-06-10 21:30:22 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-06-21 19:54:05 +0400
commit8f7d5efbef8718a774ac5e347b4ec069f17fd9b4 (patch)
treeaa95020eb43fe3cdb45ce96c9ec024b92f5c7621 /fs/nfs/pnfs.c
parent19345cb299e8234006c5125151ab723e851a1d24 (diff)
downloadlinux-8f7d5efbef8718a774ac5e347b4ec069f17fd9b4.tar.xz
NFSv4.1: Fix some issues with pnfs_generic_pg_test
1. If the intention is to coalesce requests 'prev' and 'req' then we have to ensure at least that we have a layout starting at req_offset(prev). 2. If we're only requesting a minimal layout of length desc->pg_count, we need to test the length actually returned by the server before we allow the coalescing to occur. 3. We need to deal correctly with (pgio->lseg == NULL) 4. Fixup the test guarding the pnfs_update_layout. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/pnfs.c')
-rw-r--r--fs/nfs/pnfs.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 539b94cb6c0f..0f42e02436ee 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1064,19 +1064,21 @@ pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
gfp_flags = GFP_NOFS;
}
- if (pgio->pg_count == prev->wb_bytes) {
+ if (pgio->pg_lseg == NULL) {
+ if (pgio->pg_count != prev->wb_bytes)
+ return true;
/* This is first coelesce call for a series of nfs_pages */
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
prev->wb_context,
- req_offset(req),
+ req_offset(prev),
pgio->pg_count,
access_type,
gfp_flags);
- return true;
+ if (pgio->pg_lseg == NULL)
+ return true;
}
- if (pgio->pg_lseg &&
- req_offset(req) > end_offset(pgio->pg_lseg->pls_range.offset,
+ if (req_offset(req) > end_offset(pgio->pg_lseg->pls_range.offset,
pgio->pg_lseg->pls_range.length))
return false;