From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Tom Haynes <loghyr@xxxxxxxxxxxxxxx>
---
fs/nfs/internal.h | 7 +++++++
fs/nfs/pagelist.c | 8 ++++----
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index ef1c703..5be06bc 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -6,6 +6,7 @@
#include <linux/mount.h>
#include <linux/security.h>
#include <linux/crc32.h>
+#include <linux/nfs_page.h>
#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
@@ -261,6 +262,12 @@ static inline void nfs_iocounter_init(struct nfs_io_counter *c)
atomic_set(&c->io_count, 0);
}
+static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
+{
+ WARN_ON_ONCE(desc->pg_mirror_count < 1);
+ return desc->pg_mirror_count > 1;
+}
+
/* nfs2xdr.c */
extern struct rpc_procinfo nfs_procedures[];
extern int nfs2_decode_dirent(struct xdr_stream *,
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index eec12b7..f9d8c46 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -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)
--
1.9.3
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