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authorAndy Adamson <andros@netapp.com>2011-03-01 04:34:22 +0300
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-03-11 23:38:43 +0300
commit568e8c494ded95a28c5dd8b79b4d3ffb95b6d845 (patch)
tree00e71f79575635c0ddfcd1210e263088cc121da2 /fs/nfs/nfs4filelayout.c
parentea8eecdd11ee6becd09c095c8efa88aa7df95961 (diff)
downloadlinux-568e8c494ded95a28c5dd8b79b4d3ffb95b6d845.tar.xz
NFSv4.1: turn off pNFS on ds connection failure
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>
Diffstat (limited to 'fs/nfs/nfs4filelayout.c')
-rw-r--r--fs/nfs/nfs4filelayout.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index a922e75af42e..0040a5ee6208 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -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__,