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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.h
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@ -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;