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pnfs: allow LD to ask to resend read through pnfs

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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>
This commit is contained in:
Peng Tao 2014-11-10 08:35:38 +08:00 committed by Tom Haynes
parent 48d635f14a
commit ceb11e13df
2 changed files with 16 additions and 1 deletions
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15
fs/nfs/pnfs.c
View File

@ -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);
}

2
fs/nfs/pnfs.h
View File

@ -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,