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authorFred Isaman <iisaman@netapp.com>2011-03-03 15:13:47 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-03-11 15:38:44 -0500
commita69aef1496726ed88386dad65abfcc8cd3195304 (patch)
tree66766c9eed54e6dc7ddf9ecaf8765a7bc833685e /fs/nfs/nfs4filelayout.c
parent7ffd10640dc008f6d5a375bd6450755745c63c7d (diff)
NFSv4.1: pnfs filelayout driver write
Allows the pnfs filelayout driver to write to the data servers. Note that COMMIT to data servers will be implemented in a future patch. To avoid improper behavior, for the moment any WRITE to a data server that would also require a COMMIT to the data server is sent NFS_FILE_SYNC. Signed-off-by: Andy Adamson <andros@citi.umich.edu> Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com> Signed-off-by: Fred Isaman <iisaman@citi.umich.edu> Signed-off-by: Mingyang Guo <guomingyang@nrchpc.ac.cn> Signed-off-by: Oleg Drokin <green@linuxhacker.ru> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com> Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4filelayout.c')
-rw-r--r--fs/nfs/nfs4filelayout.c101
1 files changed, 100 insertions, 1 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 9d21bfeec88..7e1d4571b7b 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -189,12 +189,69 @@ static void filelayout_read_release(void *data)
rdata->mds_ops->rpc_release(data);
}
+static int filelayout_write_done_cb(struct rpc_task *task,
+ struct nfs_write_data *data)
+{
+ int reset = 0;
+
+ if (filelayout_async_handle_error(task, data->args.context->state,
+ data->ds_clp, &reset) == -EAGAIN) {
+ struct nfs_client *clp;
+
+ dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
+ __func__, data->ds_clp, data->ds_clp->cl_session);
+ if (reset) {
+ filelayout_set_lo_fail(data->lseg);
+ nfs4_reset_write(task, data);
+ clp = NFS_SERVER(data->inode)->nfs_client;
+ } else
+ clp = data->ds_clp;
+ nfs_restart_rpc(task, clp);
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+static void filelayout_write_prepare(struct rpc_task *task, void *data)
+{
+ struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+ if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
+ &wdata->args.seq_args, &wdata->res.seq_res,
+ 0, task))
+ return;
+
+ rpc_call_start(task);
+}
+
+static void filelayout_write_call_done(struct rpc_task *task, void *data)
+{
+ struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+ /* Note this may cause RPC to be resent */
+ wdata->mds_ops->rpc_call_done(task, data);
+}
+
+static void filelayout_write_release(void *data)
+{
+ struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+ wdata->mds_ops->rpc_release(data);
+}
+
struct rpc_call_ops filelayout_read_call_ops = {
.rpc_call_prepare = filelayout_read_prepare,
.rpc_call_done = filelayout_read_call_done,
.rpc_release = filelayout_read_release,
};
+struct rpc_call_ops filelayout_write_call_ops = {
+ .rpc_call_prepare = filelayout_write_prepare,
+ .rpc_call_done = filelayout_write_call_done,
+ .rpc_release = filelayout_write_release,
+};
+
static enum pnfs_try_status
filelayout_read_pagelist(struct nfs_read_data *data)
{
@@ -238,10 +295,52 @@ filelayout_read_pagelist(struct nfs_read_data *data)
return PNFS_ATTEMPTED;
}
+/* Perform async writes. */
static enum pnfs_try_status
filelayout_write_pagelist(struct nfs_write_data *data, int sync)
{
- return PNFS_NOT_ATTEMPTED;
+ struct pnfs_layout_segment *lseg = data->lseg;
+ struct nfs4_pnfs_ds *ds;
+ loff_t offset = data->args.offset;
+ u32 j, idx;
+ struct nfs_fh *fh;
+ int status;
+
+ /* Retrieve the correct rpc_client for the byte range */
+ j = nfs4_fl_calc_j_index(lseg, offset);
+ idx = nfs4_fl_calc_ds_index(lseg, j);
+ ds = nfs4_fl_prepare_ds(lseg, idx);
+ if (!ds) {
+ printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
+ set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
+ set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
+ return PNFS_NOT_ATTEMPTED;
+ }
+ dprintk("%s ino %lu sync %d req %Zu@%llu DS:%x:%hu\n", __func__,
+ data->inode->i_ino, sync, (size_t) data->args.count, offset,
+ ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
+
+ /* We can't handle commit to ds yet */
+ if (!FILELAYOUT_LSEG(lseg)->commit_through_mds)
+ data->args.stable = NFS_FILE_SYNC;
+
+ data->write_done_cb = filelayout_write_done_cb;
+ data->ds_clp = ds->ds_clp;
+ fh = nfs4_fl_select_ds_fh(lseg, j);
+ if (fh)
+ data->args.fh = fh;
+ /*
+ * Get the file offset on the dserver. Set the write offset to
+ * this offset and save the original offset.
+ */
+ data->args.offset = filelayout_get_dserver_offset(lseg, offset);
+ data->mds_offset = offset;
+
+ /* Perform an asynchronous write */
+ status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
+ &filelayout_write_call_ops, sync);
+ BUG_ON(status != 0);
+ return PNFS_ATTEMPTED;
}
/*