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nfs: only reset desc->pg_mirror_idx when mirroring is supported

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so that we don't reset desc->pg_mirror_idx for read unnecessarily.
Remove WARN_ON_ONCE from __nfs_pageio_add_request to allow LD to
set pg_mirror_idx for read where pg_mirror_count is always 1.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <loghyr@primarydata.com>
This commit is contained in:
Peng Tao
2014-11-10 08:35:34 +08:00
committed by Tom Haynes
parent 566f873763
commit 47af81f295
2 changed files with 11 additions and 4 deletions
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8
fs/nfs/pagelist.c
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@@ -1021,8 +1021,6 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
unsigned int bytes_left = 0;
unsigned int offset, pgbase;
WARN_ON_ONCE(desc->pg_mirror_idx >= desc->pg_mirror_count);
nfs_page_group_lock(req, false);
subreq = req;
@@ -1162,7 +1160,8 @@ int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
} else
dupreq = req;
desc->pg_mirror_idx = midx;
if (nfs_pgio_has_mirroring(desc))
desc->pg_mirror_idx = midx;
if (!nfs_pageio_add_request_mirror(desc, dupreq))
return 0;
}
@@ -1181,7 +1180,8 @@ static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx];
u32 restore_idx = desc->pg_mirror_idx;
desc->pg_mirror_idx = mirror_idx;
if (nfs_pgio_has_mirroring(desc))
desc->pg_mirror_idx = mirror_idx;
for (;;) {
nfs_pageio_doio(desc);
if (!mirror->pg_recoalesce)