2dc317565b
The error handler nfs4_state parameter is never NULL in the pNFS case as the open_context must carry an nfs_state. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
995 lines
27 KiB
C
995 lines
27 KiB
C
/*
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* Module for the pnfs nfs4 file layout driver.
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* Defines all I/O and Policy interface operations, plus code
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* to register itself with the pNFS client.
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*
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* Copyright (c) 2002
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Dean Hildebrand <dhildebz@umich.edu>
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*
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* Permission is granted to use, copy, create derivative works, and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the University of Michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. If
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* the above copyright notice or any other identification of the
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* University of Michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#include <linux/nfs_fs.h>
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#include <linux/nfs_page.h>
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#include <linux/module.h>
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#include <linux/sunrpc/metrics.h>
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#include "internal.h"
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#include "delegation.h"
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#include "nfs4filelayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
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MODULE_DESCRIPTION("The NFSv4 file layout driver");
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#define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
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static loff_t
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filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
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loff_t offset)
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{
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u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
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u64 stripe_no;
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u32 rem;
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offset -= flseg->pattern_offset;
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stripe_no = div_u64(offset, stripe_width);
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div_u64_rem(offset, flseg->stripe_unit, &rem);
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return stripe_no * flseg->stripe_unit + rem;
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}
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/* This function is used by the layout driver to calculate the
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* offset of the file on the dserver based on whether the
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* layout type is STRIPE_DENSE or STRIPE_SPARSE
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*/
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static loff_t
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filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
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{
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struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
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switch (flseg->stripe_type) {
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case STRIPE_SPARSE:
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return offset;
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case STRIPE_DENSE:
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return filelayout_get_dense_offset(flseg, offset);
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}
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BUG();
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}
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static int filelayout_async_handle_error(struct rpc_task *task,
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struct nfs4_state *state,
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struct nfs_client *clp,
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int *reset)
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{
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struct nfs_server *mds_server = NFS_SERVER(state->inode);
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struct nfs_client *mds_client = mds_server->nfs_client;
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if (task->tk_status >= 0)
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return 0;
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*reset = 0;
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switch (task->tk_status) {
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/* MDS state errors */
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case -NFS4ERR_DELEG_REVOKED:
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case -NFS4ERR_ADMIN_REVOKED:
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case -NFS4ERR_BAD_STATEID:
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nfs_remove_bad_delegation(state->inode);
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case -NFS4ERR_OPENMODE:
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nfs4_schedule_stateid_recovery(mds_server, state);
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goto wait_on_recovery;
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case -NFS4ERR_EXPIRED:
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nfs4_schedule_stateid_recovery(mds_server, state);
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nfs4_schedule_lease_recovery(mds_client);
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goto wait_on_recovery;
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/* DS session errors */
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case -NFS4ERR_BADSESSION:
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case -NFS4ERR_BADSLOT:
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case -NFS4ERR_BAD_HIGH_SLOT:
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case -NFS4ERR_DEADSESSION:
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case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
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case -NFS4ERR_SEQ_FALSE_RETRY:
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case -NFS4ERR_SEQ_MISORDERED:
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dprintk("%s ERROR %d, Reset session. Exchangeid "
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"flags 0x%x\n", __func__, task->tk_status,
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clp->cl_exchange_flags);
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nfs4_schedule_session_recovery(clp->cl_session);
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break;
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case -NFS4ERR_DELAY:
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case -NFS4ERR_GRACE:
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case -EKEYEXPIRED:
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rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
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break;
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case -NFS4ERR_RETRY_UNCACHED_REP:
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break;
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default:
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dprintk("%s DS error. Retry through MDS %d\n", __func__,
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task->tk_status);
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*reset = 1;
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break;
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}
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out:
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task->tk_status = 0;
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return -EAGAIN;
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wait_on_recovery:
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rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
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if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
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rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
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goto out;
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}
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/* NFS_PROTO call done callback routines */
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static int filelayout_read_done_cb(struct rpc_task *task,
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struct nfs_read_data *data)
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{
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int reset = 0;
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dprintk("%s DS read\n", __func__);
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if (filelayout_async_handle_error(task, data->args.context->state,
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data->ds_clp, &reset) == -EAGAIN) {
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dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
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__func__, data->ds_clp, data->ds_clp->cl_session);
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if (reset) {
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pnfs_set_lo_fail(data->lseg);
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nfs4_reset_read(task, data);
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}
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rpc_restart_call_prepare(task);
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return -EAGAIN;
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}
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return 0;
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}
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/*
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* We reference the rpc_cred of the first WRITE that triggers the need for
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* a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
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* rfc5661 is not clear about which credential should be used.
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*/
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static void
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filelayout_set_layoutcommit(struct nfs_write_data *wdata)
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{
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if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds ||
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wdata->res.verf->committed == NFS_FILE_SYNC)
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return;
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pnfs_set_layoutcommit(wdata);
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dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino,
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(unsigned long) NFS_I(wdata->inode)->layout->plh_lwb);
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}
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/*
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* Call ops for the async read/write cases
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* In the case of dense layouts, the offset needs to be reset to its
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* original value.
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*/
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static void filelayout_read_prepare(struct rpc_task *task, void *data)
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{
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struct nfs_read_data *rdata = (struct nfs_read_data *)data;
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rdata->read_done_cb = filelayout_read_done_cb;
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if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
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&rdata->args.seq_args, &rdata->res.seq_res,
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task))
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return;
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rpc_call_start(task);
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}
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static void filelayout_read_call_done(struct rpc_task *task, void *data)
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{
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struct nfs_read_data *rdata = (struct nfs_read_data *)data;
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dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
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/* Note this may cause RPC to be resent */
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rdata->mds_ops->rpc_call_done(task, data);
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}
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static void filelayout_read_count_stats(struct rpc_task *task, void *data)
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{
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struct nfs_read_data *rdata = (struct nfs_read_data *)data;
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rpc_count_iostats(task, NFS_SERVER(rdata->inode)->client->cl_metrics);
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}
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static void filelayout_read_release(void *data)
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{
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struct nfs_read_data *rdata = (struct nfs_read_data *)data;
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rdata->mds_ops->rpc_release(data);
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}
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static int filelayout_write_done_cb(struct rpc_task *task,
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struct nfs_write_data *data)
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{
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int reset = 0;
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if (filelayout_async_handle_error(task, data->args.context->state,
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data->ds_clp, &reset) == -EAGAIN) {
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dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
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__func__, data->ds_clp, data->ds_clp->cl_session);
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if (reset) {
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pnfs_set_lo_fail(data->lseg);
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nfs4_reset_write(task, data);
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}
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rpc_restart_call_prepare(task);
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return -EAGAIN;
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}
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filelayout_set_layoutcommit(data);
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return 0;
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}
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/* Fake up some data that will cause nfs_commit_release to retry the writes. */
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static void prepare_to_resend_writes(struct nfs_write_data *data)
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{
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struct nfs_page *first = nfs_list_entry(data->pages.next);
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data->task.tk_status = 0;
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memcpy(data->verf.verifier, first->wb_verf.verifier,
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sizeof(first->wb_verf.verifier));
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data->verf.verifier[0]++; /* ensure verifier mismatch */
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}
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static int filelayout_commit_done_cb(struct rpc_task *task,
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struct nfs_write_data *data)
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{
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int reset = 0;
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if (filelayout_async_handle_error(task, data->args.context->state,
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data->ds_clp, &reset) == -EAGAIN) {
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dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
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__func__, data->ds_clp, data->ds_clp->cl_session);
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if (reset) {
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prepare_to_resend_writes(data);
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pnfs_set_lo_fail(data->lseg);
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} else
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rpc_restart_call_prepare(task);
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return -EAGAIN;
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}
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return 0;
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}
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static void filelayout_write_prepare(struct rpc_task *task, void *data)
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{
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struct nfs_write_data *wdata = (struct nfs_write_data *)data;
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if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
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&wdata->args.seq_args, &wdata->res.seq_res,
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task))
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return;
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rpc_call_start(task);
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}
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static void filelayout_write_call_done(struct rpc_task *task, void *data)
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{
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struct nfs_write_data *wdata = (struct nfs_write_data *)data;
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/* Note this may cause RPC to be resent */
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wdata->mds_ops->rpc_call_done(task, data);
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}
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static void filelayout_write_count_stats(struct rpc_task *task, void *data)
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{
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struct nfs_write_data *wdata = (struct nfs_write_data *)data;
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rpc_count_iostats(task, NFS_SERVER(wdata->inode)->client->cl_metrics);
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}
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static void filelayout_write_release(void *data)
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{
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struct nfs_write_data *wdata = (struct nfs_write_data *)data;
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wdata->mds_ops->rpc_release(data);
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}
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static void filelayout_commit_release(void *data)
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{
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struct nfs_write_data *wdata = (struct nfs_write_data *)data;
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nfs_commit_release_pages(wdata);
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if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding))
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nfs_commit_clear_lock(NFS_I(wdata->inode));
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nfs_commitdata_release(wdata);
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}
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struct rpc_call_ops filelayout_read_call_ops = {
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.rpc_call_prepare = filelayout_read_prepare,
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.rpc_call_done = filelayout_read_call_done,
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.rpc_count_stats = filelayout_read_count_stats,
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.rpc_release = filelayout_read_release,
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};
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struct rpc_call_ops filelayout_write_call_ops = {
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.rpc_call_prepare = filelayout_write_prepare,
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.rpc_call_done = filelayout_write_call_done,
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.rpc_count_stats = filelayout_write_count_stats,
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.rpc_release = filelayout_write_release,
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};
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struct rpc_call_ops filelayout_commit_call_ops = {
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.rpc_call_prepare = filelayout_write_prepare,
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.rpc_call_done = filelayout_write_call_done,
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.rpc_count_stats = filelayout_write_count_stats,
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.rpc_release = filelayout_commit_release,
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};
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static enum pnfs_try_status
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filelayout_read_pagelist(struct nfs_read_data *data)
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{
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struct pnfs_layout_segment *lseg = data->lseg;
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struct nfs4_pnfs_ds *ds;
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loff_t offset = data->args.offset;
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u32 j, idx;
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struct nfs_fh *fh;
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int status;
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dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
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__func__, data->inode->i_ino,
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data->args.pgbase, (size_t)data->args.count, offset);
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if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
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return PNFS_NOT_ATTEMPTED;
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/* Retrieve the correct rpc_client for the byte range */
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j = nfs4_fl_calc_j_index(lseg, offset);
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idx = nfs4_fl_calc_ds_index(lseg, j);
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ds = nfs4_fl_prepare_ds(lseg, idx);
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if (!ds) {
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/* Either layout fh index faulty, or ds connect failed */
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set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
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set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
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return PNFS_NOT_ATTEMPTED;
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}
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dprintk("%s USE DS: %s\n", __func__, ds->ds_remotestr);
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/* No multipath support. Use first DS */
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data->ds_clp = ds->ds_clp;
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fh = nfs4_fl_select_ds_fh(lseg, j);
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if (fh)
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data->args.fh = fh;
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data->args.offset = filelayout_get_dserver_offset(lseg, offset);
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data->mds_offset = offset;
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/* Perform an asynchronous read to ds */
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status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
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&filelayout_read_call_ops);
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BUG_ON(status != 0);
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return PNFS_ATTEMPTED;
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}
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/* Perform async writes. */
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static enum pnfs_try_status
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filelayout_write_pagelist(struct nfs_write_data *data, int sync)
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{
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struct pnfs_layout_segment *lseg = data->lseg;
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struct nfs4_pnfs_ds *ds;
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loff_t offset = data->args.offset;
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u32 j, idx;
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struct nfs_fh *fh;
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int status;
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if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
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return PNFS_NOT_ATTEMPTED;
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/* Retrieve the correct rpc_client for the byte range */
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j = nfs4_fl_calc_j_index(lseg, offset);
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idx = nfs4_fl_calc_ds_index(lseg, j);
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ds = nfs4_fl_prepare_ds(lseg, idx);
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if (!ds) {
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printk(KERN_ERR "NFS: %s: prepare_ds failed, use MDS\n",
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__func__);
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set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
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set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
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return PNFS_NOT_ATTEMPTED;
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}
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dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__,
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data->inode->i_ino, sync, (size_t) data->args.count, offset,
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ds->ds_remotestr);
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data->write_done_cb = filelayout_write_done_cb;
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data->ds_clp = ds->ds_clp;
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fh = nfs4_fl_select_ds_fh(lseg, j);
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if (fh)
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data->args.fh = fh;
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/*
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* Get the file offset on the dserver. Set the write offset to
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* this offset and save the original offset.
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*/
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data->args.offset = filelayout_get_dserver_offset(lseg, offset);
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/* Perform an asynchronous write */
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status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
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&filelayout_write_call_ops, sync);
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BUG_ON(status != 0);
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return PNFS_ATTEMPTED;
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}
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/*
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* filelayout_check_layout()
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*
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* Make sure layout segment parameters are sane WRT the device.
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* At this point no generic layer initialization of the lseg has occurred,
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* and nothing has been added to the layout_hdr cache.
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*
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*/
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static int
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filelayout_check_layout(struct pnfs_layout_hdr *lo,
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struct nfs4_filelayout_segment *fl,
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struct nfs4_layoutget_res *lgr,
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struct nfs4_deviceid *id,
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gfp_t gfp_flags)
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{
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struct nfs4_deviceid_node *d;
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struct nfs4_file_layout_dsaddr *dsaddr;
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int status = -EINVAL;
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struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
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dprintk("--> %s\n", __func__);
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/* FIXME: remove this check when layout segment support is added */
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if (lgr->range.offset != 0 ||
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lgr->range.length != NFS4_MAX_UINT64) {
|
|
dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
|
|
__func__);
|
|
goto out;
|
|
}
|
|
|
|
if (fl->pattern_offset > lgr->range.offset) {
|
|
dprintk("%s pattern_offset %lld too large\n",
|
|
__func__, fl->pattern_offset);
|
|
goto out;
|
|
}
|
|
|
|
if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
|
|
dprintk("%s Invalid stripe unit (%u)\n",
|
|
__func__, fl->stripe_unit);
|
|
goto out;
|
|
}
|
|
|
|
/* find and reference the deviceid */
|
|
d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
|
|
NFS_SERVER(lo->plh_inode)->nfs_client, id);
|
|
if (d == NULL) {
|
|
dsaddr = get_device_info(lo->plh_inode, id, gfp_flags);
|
|
if (dsaddr == NULL)
|
|
goto out;
|
|
} else
|
|
dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
|
|
/* Found deviceid is being reaped */
|
|
if (test_bit(NFS_DEVICEID_INVALID, &dsaddr->id_node.flags))
|
|
goto out_put;
|
|
|
|
fl->dsaddr = dsaddr;
|
|
|
|
if (fl->first_stripe_index >= dsaddr->stripe_count) {
|
|
dprintk("%s Bad first_stripe_index %u\n",
|
|
__func__, fl->first_stripe_index);
|
|
goto out_put;
|
|
}
|
|
|
|
if ((fl->stripe_type == STRIPE_SPARSE &&
|
|
fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
|
|
(fl->stripe_type == STRIPE_DENSE &&
|
|
fl->num_fh != dsaddr->stripe_count)) {
|
|
dprintk("%s num_fh %u not valid for given packing\n",
|
|
__func__, fl->num_fh);
|
|
goto out_put;
|
|
}
|
|
|
|
if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
|
|
dprintk("%s Stripe unit (%u) not aligned with rsize %u "
|
|
"wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
|
|
nfss->wsize);
|
|
}
|
|
|
|
status = 0;
|
|
out:
|
|
dprintk("--> %s returns %d\n", __func__, status);
|
|
return status;
|
|
out_put:
|
|
nfs4_fl_put_deviceid(dsaddr);
|
|
goto out;
|
|
}
|
|
|
|
static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < fl->num_fh; i++) {
|
|
if (!fl->fh_array[i])
|
|
break;
|
|
kfree(fl->fh_array[i]);
|
|
}
|
|
kfree(fl->fh_array);
|
|
fl->fh_array = NULL;
|
|
}
|
|
|
|
static void
|
|
_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
|
|
{
|
|
filelayout_free_fh_array(fl);
|
|
kfree(fl);
|
|
}
|
|
|
|
static int
|
|
filelayout_decode_layout(struct pnfs_layout_hdr *flo,
|
|
struct nfs4_filelayout_segment *fl,
|
|
struct nfs4_layoutget_res *lgr,
|
|
struct nfs4_deviceid *id,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct xdr_stream stream;
|
|
struct xdr_buf buf;
|
|
struct page *scratch;
|
|
__be32 *p;
|
|
uint32_t nfl_util;
|
|
int i;
|
|
|
|
dprintk("%s: set_layout_map Begin\n", __func__);
|
|
|
|
scratch = alloc_page(gfp_flags);
|
|
if (!scratch)
|
|
return -ENOMEM;
|
|
|
|
xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
|
|
xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
|
|
|
|
/* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
|
|
* num_fh (4) */
|
|
p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
|
|
if (unlikely(!p))
|
|
goto out_err;
|
|
|
|
memcpy(id, p, sizeof(*id));
|
|
p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
|
|
nfs4_print_deviceid(id);
|
|
|
|
nfl_util = be32_to_cpup(p++);
|
|
if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
|
|
fl->commit_through_mds = 1;
|
|
if (nfl_util & NFL4_UFLG_DENSE)
|
|
fl->stripe_type = STRIPE_DENSE;
|
|
else
|
|
fl->stripe_type = STRIPE_SPARSE;
|
|
fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
|
|
|
|
fl->first_stripe_index = be32_to_cpup(p++);
|
|
p = xdr_decode_hyper(p, &fl->pattern_offset);
|
|
fl->num_fh = be32_to_cpup(p++);
|
|
|
|
dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
|
|
__func__, nfl_util, fl->num_fh, fl->first_stripe_index,
|
|
fl->pattern_offset);
|
|
|
|
/* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
|
|
* Futher checking is done in filelayout_check_layout */
|
|
if (fl->num_fh >
|
|
max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
|
|
goto out_err;
|
|
|
|
if (fl->num_fh > 0) {
|
|
fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
|
|
gfp_flags);
|
|
if (!fl->fh_array)
|
|
goto out_err;
|
|
}
|
|
|
|
for (i = 0; i < fl->num_fh; i++) {
|
|
/* Do we want to use a mempool here? */
|
|
fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
|
|
if (!fl->fh_array[i])
|
|
goto out_err_free;
|
|
|
|
p = xdr_inline_decode(&stream, 4);
|
|
if (unlikely(!p))
|
|
goto out_err_free;
|
|
fl->fh_array[i]->size = be32_to_cpup(p++);
|
|
if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
|
|
printk(KERN_ERR "NFS: Too big fh %d received %d\n",
|
|
i, fl->fh_array[i]->size);
|
|
goto out_err_free;
|
|
}
|
|
|
|
p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
|
|
if (unlikely(!p))
|
|
goto out_err_free;
|
|
memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
|
|
dprintk("DEBUG: %s: fh len %d\n", __func__,
|
|
fl->fh_array[i]->size);
|
|
}
|
|
|
|
__free_page(scratch);
|
|
return 0;
|
|
|
|
out_err_free:
|
|
filelayout_free_fh_array(fl);
|
|
out_err:
|
|
__free_page(scratch);
|
|
return -EIO;
|
|
}
|
|
|
|
static void
|
|
filelayout_free_lseg(struct pnfs_layout_segment *lseg)
|
|
{
|
|
struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
nfs4_fl_put_deviceid(fl->dsaddr);
|
|
kfree(fl->commit_buckets);
|
|
_filelayout_free_lseg(fl);
|
|
}
|
|
|
|
static struct pnfs_layout_segment *
|
|
filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
|
|
struct nfs4_layoutget_res *lgr,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct nfs4_filelayout_segment *fl;
|
|
int rc;
|
|
struct nfs4_deviceid id;
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
fl = kzalloc(sizeof(*fl), gfp_flags);
|
|
if (!fl)
|
|
return NULL;
|
|
|
|
rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
|
|
if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
|
|
_filelayout_free_lseg(fl);
|
|
return NULL;
|
|
}
|
|
|
|
/* This assumes there is only one IOMODE_RW lseg. What
|
|
* we really want to do is have a layout_hdr level
|
|
* dictionary of <multipath_list4, fh> keys, each
|
|
* associated with a struct list_head, populated by calls
|
|
* to filelayout_write_pagelist().
|
|
* */
|
|
if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) {
|
|
int i;
|
|
int size = (fl->stripe_type == STRIPE_SPARSE) ?
|
|
fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
|
|
|
|
fl->commit_buckets = kcalloc(size, sizeof(struct list_head), gfp_flags);
|
|
if (!fl->commit_buckets) {
|
|
filelayout_free_lseg(&fl->generic_hdr);
|
|
return NULL;
|
|
}
|
|
fl->number_of_buckets = size;
|
|
for (i = 0; i < size; i++)
|
|
INIT_LIST_HEAD(&fl->commit_buckets[i]);
|
|
}
|
|
return &fl->generic_hdr;
|
|
}
|
|
|
|
/*
|
|
* filelayout_pg_test(). Called by nfs_can_coalesce_requests()
|
|
*
|
|
* return true : coalesce page
|
|
* return false : don't coalesce page
|
|
*/
|
|
static bool
|
|
filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
|
|
struct nfs_page *req)
|
|
{
|
|
u64 p_stripe, r_stripe;
|
|
u32 stripe_unit;
|
|
|
|
if (!pnfs_generic_pg_test(pgio, prev, req) ||
|
|
!nfs_generic_pg_test(pgio, prev, req))
|
|
return false;
|
|
|
|
p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
|
|
r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
|
|
stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
|
|
|
|
do_div(p_stripe, stripe_unit);
|
|
do_div(r_stripe, stripe_unit);
|
|
|
|
return (p_stripe == r_stripe);
|
|
}
|
|
|
|
void
|
|
filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
|
|
struct nfs_page *req)
|
|
{
|
|
BUG_ON(pgio->pg_lseg != NULL);
|
|
|
|
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
|
|
req->wb_context,
|
|
0,
|
|
NFS4_MAX_UINT64,
|
|
IOMODE_READ,
|
|
GFP_KERNEL);
|
|
/* If no lseg, fall back to read through mds */
|
|
if (pgio->pg_lseg == NULL)
|
|
nfs_pageio_reset_read_mds(pgio);
|
|
}
|
|
|
|
void
|
|
filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
|
|
struct nfs_page *req)
|
|
{
|
|
BUG_ON(pgio->pg_lseg != NULL);
|
|
|
|
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
|
|
req->wb_context,
|
|
0,
|
|
NFS4_MAX_UINT64,
|
|
IOMODE_RW,
|
|
GFP_NOFS);
|
|
/* If no lseg, fall back to write through mds */
|
|
if (pgio->pg_lseg == NULL)
|
|
nfs_pageio_reset_write_mds(pgio);
|
|
}
|
|
|
|
static const struct nfs_pageio_ops filelayout_pg_read_ops = {
|
|
.pg_init = filelayout_pg_init_read,
|
|
.pg_test = filelayout_pg_test,
|
|
.pg_doio = pnfs_generic_pg_readpages,
|
|
};
|
|
|
|
static const struct nfs_pageio_ops filelayout_pg_write_ops = {
|
|
.pg_init = filelayout_pg_init_write,
|
|
.pg_test = filelayout_pg_test,
|
|
.pg_doio = pnfs_generic_pg_writepages,
|
|
};
|
|
|
|
static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg)
|
|
{
|
|
return !FILELAYOUT_LSEG(lseg)->commit_through_mds;
|
|
}
|
|
|
|
static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
|
|
{
|
|
if (fl->stripe_type == STRIPE_SPARSE)
|
|
return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
|
|
else
|
|
return j;
|
|
}
|
|
|
|
struct list_head *filelayout_choose_commit_list(struct nfs_page *req)
|
|
{
|
|
struct pnfs_layout_segment *lseg = req->wb_commit_lseg;
|
|
struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
|
|
u32 i, j;
|
|
struct list_head *list;
|
|
|
|
/* Note that we are calling nfs4_fl_calc_j_index on each page
|
|
* that ends up being committed to a data server. An attractive
|
|
* alternative is to add a field to nfs_write_data and nfs_page
|
|
* to store the value calculated in filelayout_write_pagelist
|
|
* and just use that here.
|
|
*/
|
|
j = nfs4_fl_calc_j_index(lseg,
|
|
(loff_t)req->wb_index << PAGE_CACHE_SHIFT);
|
|
i = select_bucket_index(fl, j);
|
|
list = &fl->commit_buckets[i];
|
|
if (list_empty(list)) {
|
|
/* Non-empty buckets hold a reference on the lseg */
|
|
get_lseg(lseg);
|
|
}
|
|
return list;
|
|
}
|
|
|
|
static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
|
|
{
|
|
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
|
|
|
|
if (flseg->stripe_type == STRIPE_SPARSE)
|
|
return i;
|
|
else
|
|
return nfs4_fl_calc_ds_index(lseg, i);
|
|
}
|
|
|
|
static struct nfs_fh *
|
|
select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
|
|
{
|
|
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
|
|
|
|
if (flseg->stripe_type == STRIPE_SPARSE) {
|
|
if (flseg->num_fh == 1)
|
|
i = 0;
|
|
else if (flseg->num_fh == 0)
|
|
/* Use the MDS OPEN fh set in nfs_read_rpcsetup */
|
|
return NULL;
|
|
}
|
|
return flseg->fh_array[i];
|
|
}
|
|
|
|
static int filelayout_initiate_commit(struct nfs_write_data *data, int how)
|
|
{
|
|
struct pnfs_layout_segment *lseg = data->lseg;
|
|
struct nfs4_pnfs_ds *ds;
|
|
u32 idx;
|
|
struct nfs_fh *fh;
|
|
|
|
idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
|
|
ds = nfs4_fl_prepare_ds(lseg, idx);
|
|
if (!ds) {
|
|
printk(KERN_ERR "NFS: %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);
|
|
prepare_to_resend_writes(data);
|
|
data->mds_ops->rpc_release(data);
|
|
return -EAGAIN;
|
|
}
|
|
dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how);
|
|
data->write_done_cb = filelayout_commit_done_cb;
|
|
data->ds_clp = ds->ds_clp;
|
|
fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
|
|
if (fh)
|
|
data->args.fh = fh;
|
|
return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient,
|
|
&filelayout_commit_call_ops, how);
|
|
}
|
|
|
|
/*
|
|
* This is only useful while we are using whole file layouts.
|
|
*/
|
|
static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode)
|
|
{
|
|
struct pnfs_layout_segment *lseg, *rv = NULL;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
|
|
if (lseg->pls_range.iomode == IOMODE_RW)
|
|
rv = get_lseg(lseg);
|
|
spin_unlock(&inode->i_lock);
|
|
return rv;
|
|
}
|
|
|
|
static int alloc_ds_commits(struct inode *inode, struct list_head *list)
|
|
{
|
|
struct pnfs_layout_segment *lseg;
|
|
struct nfs4_filelayout_segment *fl;
|
|
struct nfs_write_data *data;
|
|
int i, j;
|
|
|
|
/* Won't need this when non-whole file layout segments are supported
|
|
* instead we will use a pnfs_layout_hdr structure */
|
|
lseg = find_only_write_lseg(inode);
|
|
if (!lseg)
|
|
return 0;
|
|
fl = FILELAYOUT_LSEG(lseg);
|
|
for (i = 0; i < fl->number_of_buckets; i++) {
|
|
if (list_empty(&fl->commit_buckets[i]))
|
|
continue;
|
|
data = nfs_commitdata_alloc();
|
|
if (!data)
|
|
goto out_bad;
|
|
data->ds_commit_index = i;
|
|
data->lseg = lseg;
|
|
list_add(&data->pages, list);
|
|
}
|
|
put_lseg(lseg);
|
|
return 0;
|
|
|
|
out_bad:
|
|
for (j = i; j < fl->number_of_buckets; j++) {
|
|
if (list_empty(&fl->commit_buckets[i]))
|
|
continue;
|
|
nfs_retry_commit(&fl->commit_buckets[i], lseg);
|
|
put_lseg(lseg); /* associated with emptying bucket */
|
|
}
|
|
put_lseg(lseg);
|
|
/* Caller will clean up entries put on list */
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* This follows nfs_commit_list pretty closely */
|
|
static int
|
|
filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
|
|
int how)
|
|
{
|
|
struct nfs_write_data *data, *tmp;
|
|
LIST_HEAD(list);
|
|
|
|
if (!list_empty(mds_pages)) {
|
|
data = nfs_commitdata_alloc();
|
|
if (!data)
|
|
goto out_bad;
|
|
data->lseg = NULL;
|
|
list_add(&data->pages, &list);
|
|
}
|
|
|
|
if (alloc_ds_commits(inode, &list))
|
|
goto out_bad;
|
|
|
|
list_for_each_entry_safe(data, tmp, &list, pages) {
|
|
list_del_init(&data->pages);
|
|
atomic_inc(&NFS_I(inode)->commits_outstanding);
|
|
if (!data->lseg) {
|
|
nfs_init_commit(data, mds_pages, NULL);
|
|
nfs_initiate_commit(data, NFS_CLIENT(inode),
|
|
data->mds_ops, how);
|
|
} else {
|
|
nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg);
|
|
filelayout_initiate_commit(data, how);
|
|
}
|
|
}
|
|
return 0;
|
|
out_bad:
|
|
list_for_each_entry_safe(data, tmp, &list, pages) {
|
|
nfs_retry_commit(&data->pages, data->lseg);
|
|
list_del_init(&data->pages);
|
|
nfs_commit_free(data);
|
|
}
|
|
nfs_retry_commit(mds_pages, NULL);
|
|
nfs_commit_clear_lock(NFS_I(inode));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void
|
|
filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
|
|
{
|
|
nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
|
|
}
|
|
|
|
static struct pnfs_layoutdriver_type filelayout_type = {
|
|
.id = LAYOUT_NFSV4_1_FILES,
|
|
.name = "LAYOUT_NFSV4_1_FILES",
|
|
.owner = THIS_MODULE,
|
|
.alloc_lseg = filelayout_alloc_lseg,
|
|
.free_lseg = filelayout_free_lseg,
|
|
.pg_read_ops = &filelayout_pg_read_ops,
|
|
.pg_write_ops = &filelayout_pg_write_ops,
|
|
.mark_pnfs_commit = filelayout_mark_pnfs_commit,
|
|
.choose_commit_list = filelayout_choose_commit_list,
|
|
.commit_pagelist = filelayout_commit_pagelist,
|
|
.read_pagelist = filelayout_read_pagelist,
|
|
.write_pagelist = filelayout_write_pagelist,
|
|
.free_deviceid_node = filelayout_free_deveiceid_node,
|
|
};
|
|
|
|
static int __init nfs4filelayout_init(void)
|
|
{
|
|
printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
|
|
__func__);
|
|
return pnfs_register_layoutdriver(&filelayout_type);
|
|
}
|
|
|
|
static void __exit nfs4filelayout_exit(void)
|
|
{
|
|
printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
|
|
__func__);
|
|
pnfs_unregister_layoutdriver(&filelayout_type);
|
|
}
|
|
|
|
MODULE_ALIAS("nfs-layouttype4-1");
|
|
|
|
module_init(nfs4filelayout_init);
|
|
module_exit(nfs4filelayout_exit);
|