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authorFred Isaman <iisaman@netapp.com>2012-04-20 19:55:31 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-04-27 14:10:38 -0400
commit1825a0d08f22463e5a8f4b1636473efd057a3479 (patch)
treeb010b2bbb71431802cb1714483b69060ce09ff39 /fs/nfs
parent9533da2979757258d3fd5429d830a297013d69ed (diff)
downloadop-kernel-dev-1825a0d08f22463e5a8f4b1636473efd057a3479.zip
op-kernel-dev-1825a0d08f22463e5a8f4b1636473efd057a3479.tar.gz
NFS: prepare coalesce testing for directio
The coalesce code made assumptions that will no longer be true once non-page aligned io occurs. This introduces no change in current behavior, but allows for more general situations to come. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4filelayout.c12
-rw-r--r--fs/nfs/pagelist.c4
-rw-r--r--fs/nfs/pnfs.c8
3 files changed, 22 insertions, 2 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 02d8170..e40523f 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -796,6 +796,16 @@ filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
{
BUG_ON(pgio->pg_lseg != NULL);
+ if (req->wb_offset != req->wb_pgbase) {
+ /*
+ * Handling unaligned pages is difficult, because have to
+ * somehow split a req in two in certain cases in the
+ * pg.test code. Avoid this by just not using pnfs
+ * in this case.
+ */
+ nfs_pageio_reset_read_mds(pgio);
+ return;
+ }
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,
@@ -815,6 +825,8 @@ filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
BUG_ON(pgio->pg_lseg != NULL);
+ if (req->wb_offset != req->wb_pgbase)
+ goto out_mds;
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 5d01a16..638ca7f 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -280,12 +280,12 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
return false;
if (req->wb_context->state != prev->wb_context->state)
return false;
- if (req->wb_index != (prev->wb_index + 1))
- return false;
if (req->wb_pgbase != 0)
return false;
if (prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE)
return false;
+ if (req_offset(req) != req_offset(prev) + prev->wb_bytes)
+ return false;
return pgio->pg_ops->pg_test(pgio, prev, req);
}
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index b3a0c01..4da05e4 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1082,6 +1082,10 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
{
BUG_ON(pgio->pg_lseg != NULL);
+ if (req->wb_offset != req->wb_pgbase) {
+ nfs_pageio_reset_read_mds(pgio);
+ return;
+ }
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
req_offset(req),
@@ -1100,6 +1104,10 @@ pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *
{
BUG_ON(pgio->pg_lseg != NULL);
+ if (req->wb_offset != req->wb_pgbase) {
+ nfs_pageio_reset_write_mds(pgio);
+ return;
+ }
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
req_offset(req),
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