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NFS: Cleanup of NFS write code in preparation for asynchronous o_direct

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This patch inverts the callback hierarchy for NFS write calls.

Instead of having the NFSv2/v3/v4-specific code set up the RPC callback
ops, we allow the original caller to do so. This allows for more
flexibility w.r.t. how to set up and tear down the nfs_write_data
structure while still allowing the NFSv3/v4 code to perform error
handling.

The greater flexibility is needed by the asynchronous O_DIRECT code, which
wants to be able to hold on to the original nfs_write_data structures after
the WRITE RPC call has completed in order to be able to replay them if the
COMMIT call determines that the server has rebooted.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2006-03-20 13:44:27 -05:00
parent 7117bf3dfb
commit 788e7a89a0
6 changed files with 103 additions and 143 deletions
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24
fs/nfs/proc.c
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@@ -654,26 +654,15 @@ nfs_proc_read_setup(struct nfs_read_data *data)
rpc_call_setup(task, &msg, 0);
}
static void nfs_write_done(struct rpc_task *task, void *calldata)
static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
struct nfs_write_data *data = calldata;
if (task->tk_status >= 0)
nfs_post_op_update_inode(data->inode, data->res.fattr);
nfs_writeback_done(task, calldata);
return 0;
}
static const struct rpc_call_ops nfs_write_ops = {
.rpc_call_done = nfs_write_done,
.rpc_release = nfs_writedata_release,
};
static void
nfs_proc_write_setup(struct nfs_write_data *data, int how)
static void nfs_proc_write_setup(struct nfs_write_data *data, int how)
{
struct rpc_task *task = &data->task;
struct inode *inode = data->inode;
int flags;
struct rpc_message msg = {
.rpc_proc = &nfs_procedures[NFSPROC_WRITE],
.rpc_argp = &data->args,
@@ -684,12 +673,8 @@ nfs_proc_write_setup(struct nfs_write_data *data, int how)
/* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
data->args.stable = NFS_FILE_SYNC;
/* Set the initial flags for the task. */
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
/* Finalize the task. */
rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs_write_ops, data);
rpc_call_setup(task, &msg, 0);
rpc_call_setup(&data->task, &msg, 0);
}
static void
@@ -736,6 +721,7 @@ struct nfs_rpc_ops nfs_v2_clientops = {
.decode_dirent = nfs_decode_dirent,
.read_setup = nfs_proc_read_setup,
.write_setup = nfs_proc_write_setup,
.write_done = nfs_write_done,
.commit_setup = nfs_proc_commit_setup,
.file_open = nfs_open,
.file_release = nfs_release,