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NFSv4.1: Retry pNFS after a 2 minute timeout

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If we had to fall back to read/write through MDS, then assume that we should
retry pNFS after a suitable timeout period.
The following patch sets a timeout of 2 minutes.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-09-18 17:01:12 -04:00
parent b9e028fd89
commit 25c7533357
2 changed files with 15 additions and 1 deletions
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15
fs/nfs/pnfs.c
View File

@ -35,6 +35,7 @@
#include "iostat.h"
#define NFSDBG_FACILITY NFSDBG_PNFS
#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
/* Locking:
*
@ -248,6 +249,7 @@ pnfs_iomode_to_fail_bit(u32 iomode)
static void
pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
{
lo->plh_retry_timestamp = jiffies;
set_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags);
dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
iomode == IOMODE_RW ? "RW" : "READ");
@ -256,7 +258,18 @@ pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
static bool
pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
{
return test_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags) != 0;
unsigned long start, end;
if (test_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags) == 0)
return false;
end = jiffies;
start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
/* It is time to retry the failed layoutgets */
clear_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
clear_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
return false;
}
return true;
}
static void

1
fs/nfs/pnfs.h
View File

@ -140,6 +140,7 @@ struct pnfs_layout_hdr {
atomic_t plh_outstanding; /* number of RPCs out */
unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
u32 plh_barrier; /* ignore lower seqids */
unsigned long plh_retry_timestamp;
unsigned long plh_flags;
loff_t plh_lwb; /* last write byte for layoutcommit */
struct rpc_cred *plh_lc_cred; /* layoutcommit cred */