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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-09-18 19:51:12 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-09-28 16:03:09 -0400
commit1dfed2737d8cfe2f2378fddfb3bed126ff5474e7 (patch)
tree865edd1618f525a66a30eac1e017a896b4f2bb8c /fs/nfs/nfs4filelayout.c
parent25c7533357a4c4a9311d40cc92e9648c8a7e763e (diff)
downloadop-kernel-dev-1dfed2737d8cfe2f2378fddfb3bed126ff5474e7.zip
op-kernel-dev-1dfed2737d8cfe2f2378fddfb3bed126ff5474e7.tar.gz
NFSv4.1: pNFS data servers may be temporarily offline
In cases where the pNFS data server is just temporarily out of service, we want to mark it as such, and then try again later. Typically that will be in cases of network connection errors etc. This patch allows us to mark the devices as being "unavailable" for such transient errors, and will make them available for retries after a 2 minute timeout period. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4filelayout.c')
-rw-r--r--fs/nfs/nfs4filelayout.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index af6ee4a..dac2162 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -205,7 +205,7 @@ static int filelayout_async_handle_error(struct rpc_task *task,
case -EPIPE:
dprintk("%s DS connection error %d\n", __func__,
task->tk_status);
- filelayout_mark_devid_invalid(devid);
+ nfs4_mark_deviceid_unavailable(devid);
clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags);
_pnfs_return_layout(inode);
rpc_wake_up(&tbl->slot_tbl_waitq);
@@ -269,6 +269,22 @@ filelayout_set_layoutcommit(struct nfs_write_data *wdata)
(unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
}
+bool
+filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
+{
+ return filelayout_test_devid_invalid(node) ||
+ nfs4_test_deviceid_unavailable(node);
+}
+
+static bool
+filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
+{
+ struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
+
+ return filelayout_test_layout_invalid(lseg->pls_layout) ||
+ filelayout_test_devid_unavailable(node);
+}
+
/*
* Call ops for the async read/write cases
* In the case of dense layouts, the offset needs to be reset to its
@@ -613,8 +629,8 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
goto out;
} else
dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
- /* Found deviceid is being reaped */
- if (test_bit(NFS_DEVICEID_INVALID, &dsaddr->id_node.flags))
+ /* Found deviceid is unavailable */
+ if (filelayout_test_devid_unavailable(&dsaddr->id_node))
goto out_put;
fl->dsaddr = dsaddr;
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