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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-02-07 14:41:11 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-02-11 15:33:11 -0500
commitc137afabe330f64eddcd4dd281258807e27fd430 (patch)
tree01731471a78543c769e73e03148ade6b5cb73518 /fs/nfs
parentc5f5e9c5d2e9178fb0bfe4f44f0afcc8ad6488ef (diff)
downloadlinux-c137afabe330f64eddcd4dd281258807e27fd430.tar.bz2
NFSv4: Allow the state manager to mark an open_owner as being recovered
This patch adds a seqcount_t lock for use by the state manager to signal that an open owner has been recovered. This mechanism will be used by the delegation, open and byte range lock code in order to figure out if they need to replay requests due to collisions with lock recovery. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4_fs.h3
-rw-r--r--fs/nfs/nfs4state.c10
2 files changed, 12 insertions, 1 deletions
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index a3f488b074a2..b12b73472020 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -13,6 +13,8 @@
#define NFS4_MAX_LOOP_ON_RECOVER (10)
+#include <linux/seqlock.h>
+
struct idmap;
enum nfs4_client_state {
@@ -90,6 +92,7 @@ struct nfs4_state_owner {
unsigned long so_flags;
struct list_head so_states;
struct nfs_seqid_counter so_seqid;
+ seqcount_t so_reclaim_seqcount;
};
enum {
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index e61f68d5ef21..fff97228cdec 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -518,6 +518,7 @@ nfs4_alloc_state_owner(struct nfs_server *server,
nfs4_init_seqid_counter(&sp->so_seqid);
atomic_set(&sp->so_count, 1);
INIT_LIST_HEAD(&sp->so_lru);
+ seqcount_init(&sp->so_reclaim_seqcount);
return sp;
}
@@ -1390,8 +1391,9 @@ static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs
* recovering after a network partition or a reboot from a
* server that doesn't support a grace period.
*/
-restart:
spin_lock(&sp->so_lock);
+ write_seqcount_begin(&sp->so_reclaim_seqcount);
+restart:
list_for_each_entry(state, &sp->so_states, open_states) {
if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
continue;
@@ -1412,6 +1414,7 @@ restart:
}
spin_unlock(&state->state_lock);
nfs4_put_open_state(state);
+ spin_lock(&sp->so_lock);
goto restart;
}
}
@@ -1449,12 +1452,17 @@ restart:
goto out_err;
}
nfs4_put_open_state(state);
+ spin_lock(&sp->so_lock);
goto restart;
}
+ write_seqcount_end(&sp->so_reclaim_seqcount);
spin_unlock(&sp->so_lock);
return 0;
out_err:
nfs4_put_open_state(state);
+ spin_lock(&sp->so_lock);
+ write_seqcount_end(&sp->so_reclaim_seqcount);
+ spin_unlock(&sp->so_lock);
return status;
}