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NFSv4.1: turn off pNFS on ds connection failure

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If a data server is unavailable, go through MDS.

Mark the deviceid containing the data server as a negative cache entry.
Do not try to connect to any data server on a deviceid marked as a negative
cache entry. Mark any layout that tries to use the marked deviceid as failed.

Inodes with a layout marked as fails will not use the layout for I/O, and will
not perform any more layoutgets.
Inodes without a layout will still do layoutget, but the layout will get
marked immediately.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson
2011-03-01 01:34:22 +00:00
committed by Trond Myklebust
parent ea8eecdd11
commit 568e8c494d
4 changed files with 36 additions and 9 deletions
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4
fs/nfs/nfs4filelayout.c
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@@ -214,7 +214,9 @@ filelayout_read_pagelist(struct nfs_read_data *data)
idx = nfs4_fl_calc_ds_index(lseg, j);
ds = nfs4_fl_prepare_ds(lseg, idx);
if (!ds) {
printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
/* Either layout fh index faulty, or ds connect failed */
set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
return PNFS_NOT_ATTEMPTED;
}
dprintk("%s USE DS:ip %x %hu\n", __func__,