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authorAndy Adamson <andros@netapp.com>2011-03-01 01:34:22 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-03-11 15:38:43 -0500
commit568e8c494ded95a28c5dd8b79b4d3ffb95b6d845 (patch)
tree00e71f79575635c0ddfcd1210e263088cc121da2 /fs/nfs/nfs4filelayoutdev.c
parentea8eecdd11ee6becd09c095c8efa88aa7df95961 (diff)
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/nfs4filelayoutdev.c')
-rw-r--r--fs/nfs/nfs4filelayoutdev.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c
index f594ca35a996..68143c162e3b 100644
--- a/fs/nfs/nfs4filelayoutdev.c
+++ b/fs/nfs/nfs4filelayoutdev.c
@@ -606,6 +606,21 @@ nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
return flseg->fh_array[i];
}
+static void
+filelayout_mark_devid_negative(struct nfs4_file_layout_dsaddr *dsaddr,
+ int err, u32 ds_addr)
+{
+ u32 *p = (u32 *)&dsaddr->deviceid;
+
+ printk(KERN_ERR "NFS: data server %x connection error %d."
+ " Deviceid [%x%x%x%x] marked out of use.\n",
+ ds_addr, err, p[0], p[1], p[2], p[3]);
+
+ spin_lock(&filelayout_deviceid_lock);
+ dsaddr->flags |= NFS4_DEVICE_ID_NEG_ENTRY;
+ spin_unlock(&filelayout_deviceid_lock);
+}
+
struct nfs4_pnfs_ds *
nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
{
@@ -619,13 +634,18 @@ nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
}
if (!ds->ds_clp) {
+ struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
int err;
- err = nfs4_ds_connect(NFS_SERVER(lseg->pls_layout->plh_inode),
- dsaddr->ds_list[ds_idx]);
+ if (dsaddr->flags & NFS4_DEVICE_ID_NEG_ENTRY) {
+ /* Already tried to connect, don't try again */
+ dprintk("%s Deviceid marked out of use\n", __func__);
+ return NULL;
+ }
+ err = nfs4_ds_connect(s, ds);
if (err) {
- printk(KERN_ERR "%s nfs4_ds_connect error %d\n",
- __func__, err);
+ filelayout_mark_devid_negative(dsaddr, err,
+ ntohl(ds->ds_ip_addr));
return NULL;
}
}