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| author | Peng Tao <tao.peng@primarydata.com> | 2014-11-10 08:35:38 +0800 |
|---|---|---|
| committer | Tom Haynes <loghyr@primarydata.com> | 2015-02-03 11:06:48 -0800 |
| commit | ceb11e13df3e78b450730c615037133c57b90c3b (patch) | |
| tree | f9b179f9226e9b38c31373c6a2983f7599367da7 /fs/nfs/pnfs.c | |
| parent | 48d635f14a544c2b3ca870d2c7349b41160496d2 (diff) | |
| download | linux-ceb11e13df3e78b450730c615037133c57b90c3b.tar.bz2 | |
pnfs: allow LD to ask to resend read through pnfs
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@primarydata.com>
Signed-off-by: Tom Haynes <loghyr@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs.c')
| -rw-r--r-- | fs/nfs/pnfs.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index b822b1749643..685af4fb39ca 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); } |