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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-06-10 21:30:22 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-06-21 19:54:05 +0400 |
| commit | 8f7d5efbef8718a774ac5e347b4ec069f17fd9b4 (patch) | |
| tree | aa95020eb43fe3cdb45ce96c9ec024b92f5c7621 /fs/nfs/pnfs.c | |
| parent | 19345cb299e8234006c5125151ab723e851a1d24 (diff) | |
| download | linux-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.c | 12 |
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; |