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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/nfs4filelayout.h
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/nfs4filelayout.h')
-rw-r--r--fs/nfs/nfs4filelayout.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/nfs4filelayout.h b/fs/nfs/nfs4filelayout.h
index 23f1e1e2a0f..ee0c907742b 100644
--- a/fs/nfs/nfs4filelayout.h
+++ b/fs/nfs/nfs4filelayout.h
@@ -55,10 +55,14 @@ struct nfs4_pnfs_ds {
atomic_t ds_count;
};
+/* nfs4_file_layout_dsaddr flags */
+#define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
+
struct nfs4_file_layout_dsaddr {
struct hlist_node node;
struct nfs4_deviceid deviceid;
atomic_t ref;
+ unsigned long flags;
u32 stripe_count;
u8 *stripe_indices;
u32 ds_num;