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authorChuck Lever <cel@netapp.com>2006-06-20 12:55:45 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-24 13:11:38 -0400
commitfedb595c66e1fbd5acafe0d43b7e95c13c936d61 (patch)
treee865ecc2399c09b7164c2f2c13a2c5c10c8d4de1 /fs/nfs
parentb1c5921c5b715c207d7fe77cd7aaafbb322f09f5 (diff)
NFS: "open code" the NFS direct write rescheduler
An NFSv3/v4 client must reschedule on-the-wire writes if the writes are UNSTABLE, and the server reboots before the client can complete a subsequent COMMIT request. To support direct asynchronous scatter-gather writes, the write rescheduler in fs/nfs/direct.c must not depend on the I/O parameters in the controlling nfs_direct_req structure. iovecs can be somewhat arbitrarily complex, so there could be an unbounded amount of information to save for a rarely encountered requirement. Refactor the direct write rescheduler so it uses information from each nfs_write_data structure to reschedule writes, instead of caching that information in the controlling nfs_direct_req structure. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/direct.c51
1 files changed, 43 insertions, 8 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index d78c61a41ec..7101405713e 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -94,8 +94,8 @@ struct nfs_direct_req {
struct nfs_writeverf verf; /* unstable write verifier */
};
-static void nfs_direct_write_schedule(struct nfs_direct_req *dreq, int sync);
static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode *inode);
+static const struct rpc_call_ops nfs_write_direct_ops;
static inline void get_dreq(struct nfs_direct_req *dreq)
{
@@ -435,14 +435,51 @@ static void nfs_direct_free_writedata(struct nfs_direct_req *dreq)
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
{
- struct list_head *pos;
+ struct inode *inode = dreq->inode;
+ struct list_head *p;
+ struct nfs_write_data *data;
- list_splice_init(&dreq->rewrite_list, &dreq->list);
- list_for_each(pos, &dreq->list)
- get_dreq(dreq);
dreq->count = 0;
+ get_dreq(dreq);
+
+ list_for_each(p, &dreq->rewrite_list) {
+ data = list_entry(p, struct nfs_write_data, pages);
+
+ get_dreq(dreq);
+
+ /*
+ * Reset data->res.
+ */
+ nfs_fattr_init(&data->fattr);
+ data->res.count = data->args.count;
+ memset(&data->verf, 0, sizeof(data->verf));
+
+ /*
+ * Reuse data->task; data->args should not have changed
+ * since the original request was sent.
+ */
+ rpc_init_task(&data->task, NFS_CLIENT(inode), RPC_TASK_ASYNC,
+ &nfs_write_direct_ops, data);
+ NFS_PROTO(inode)->write_setup(data, FLUSH_STABLE);
+
+ data->task.tk_priority = RPC_PRIORITY_NORMAL;
+ data->task.tk_cookie = (unsigned long) inode;
+
+ /*
+ * We're called via an RPC callback, so BKL is already held.
+ */
+ rpc_execute(&data->task);
+
+ dprintk("NFS: %5u rescheduled direct write call (req %s/%Ld, %u bytes @ offset %Lu)\n",
+ data->task.tk_pid,
+ inode->i_sb->s_id,
+ (long long)NFS_FILEID(inode),
+ data->args.count,
+ (unsigned long long)data->args.offset);
+ }
- nfs_direct_write_schedule(dreq, FLUSH_STABLE);
+ if (put_dreq(dreq))
+ nfs_direct_write_complete(dreq, inode);
}
static void nfs_direct_commit_result(struct rpc_task *task, void *calldata)
@@ -612,8 +649,6 @@ static void nfs_direct_write_result(struct rpc_task *task, void *calldata)
}
}
}
- /* In case we have to resend */
- data->args.stable = NFS_FILE_SYNC;
spin_unlock(&dreq->lock);
}