From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
If current IO cannot be completed due to some transient errors,
LD may want to ask generic layer to resend the request through
pnfs again.
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Signed-off-by: Tom Haynes <loghyr@xxxxxxxxxxxxxxx>
---
fs/nfs/pnfs.c | 15 ++++++++++++++-
fs/nfs/pnfs.h | 2 ++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index b822b17..685af4f 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1880,15 +1880,28 @@ pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
return trypnfs;
}
+/* Resend all requests through pnfs. */
+int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
+{
+ struct nfs_pageio_descriptor pgio;
+
+ nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
+ return nfs_pageio_resend(&pgio, hdr);
+}
+EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
+
static void
pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
{
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
struct pnfs_layout_segment *lseg = desc->pg_lseg;
enum pnfs_try_status trypnfs;
+ int err = 0;
trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
- if (trypnfs == PNFS_NOT_ATTEMPTED)
+ if (trypnfs == PNFS_TRY_AGAIN)
+ err = pnfs_read_resend_pnfs(hdr);
+ if (trypnfs == PNFS_NOT_ATTEMPTED || err)
pnfs_read_through_mds(desc, hdr);
}
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 3d4a83b..6d2b544 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -72,6 +72,7 @@ struct pnfs_layout_segment {
enum pnfs_try_status {
PNFS_ATTEMPTED = 0,
PNFS_NOT_ATTEMPTED = 1,
+ PNFS_TRY_AGAIN = 2,
};
#ifdef CONFIG_NFS_V4_1
@@ -268,6 +269,7 @@ int _pnfs_return_layout(struct inode *);
int pnfs_commit_and_return_layout(struct inode *);
void pnfs_ld_write_done(struct nfs_pgio_header *);
void pnfs_ld_read_done(struct nfs_pgio_header *);
+int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
struct nfs_open_context *ctx,
loff_t pos,
--
1.9.3
--
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