![Andy Adamson](/assets/img/avatar_default.png)
If a data server is unavailable, go through MDS. Mark the deviceid containing the data server as a negative cache entry. Do not try to connect to any data server on a deviceid marked as a negative cache entry. Mark any layout that tries to use the marked deviceid as failed. Inodes with a layout marked as fails will not use the layout for I/O, and will not perform any more layoutgets. Inodes without a layout will still do layoutget, but the layout will get marked immediately. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
476 lines
13 KiB
C
476 lines
13 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 "internal.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 tmp;
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offset -= flseg->pattern_offset;
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tmp = offset;
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do_div(tmp, stripe_width);
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return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit);
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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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/* For data server errors we don't recover from */
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static void
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filelayout_set_lo_fail(struct pnfs_layout_segment *lseg)
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{
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if (lseg->pls_range.iomode == IOMODE_RW) {
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dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
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set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
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} else {
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dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
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set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
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}
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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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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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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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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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task->tk_status = 0;
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return -EAGAIN;
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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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struct nfs_client *clp = data->ds_clp;
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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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filelayout_set_lo_fail(data->lseg);
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nfs4_reset_read(task, data);
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clp = NFS_SERVER(data->inode)->nfs_client;
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}
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nfs_restart_rpc(task, clp);
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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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* 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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0, 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_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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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_release = filelayout_read_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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/* 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:ip %x %hu\n", __func__,
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ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
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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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/*
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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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{
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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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if (fl->pattern_offset > lgr->range.offset) {
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dprintk("%s pattern_offset %lld to large\n",
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__func__, fl->pattern_offset);
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goto out;
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}
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if (fl->stripe_unit % PAGE_SIZE) {
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dprintk("%s Stripe unit (%u) not page aligned\n",
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__func__, fl->stripe_unit);
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goto out;
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}
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/* find and reference the deviceid */
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dsaddr = nfs4_fl_find_get_deviceid(id);
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if (dsaddr == NULL) {
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dsaddr = get_device_info(lo->plh_inode, id);
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if (dsaddr == NULL)
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goto out;
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}
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fl->dsaddr = dsaddr;
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if (fl->first_stripe_index < 0 ||
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fl->first_stripe_index >= dsaddr->stripe_count) {
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dprintk("%s Bad first_stripe_index %d\n",
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__func__, fl->first_stripe_index);
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goto out_put;
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}
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if ((fl->stripe_type == STRIPE_SPARSE &&
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fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
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(fl->stripe_type == STRIPE_DENSE &&
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fl->num_fh != dsaddr->stripe_count)) {
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dprintk("%s num_fh %u not valid for given packing\n",
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__func__, fl->num_fh);
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goto out_put;
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}
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if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
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dprintk("%s Stripe unit (%u) not aligned with rsize %u "
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"wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
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nfss->wsize);
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}
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status = 0;
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out:
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dprintk("--> %s returns %d\n", __func__, status);
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return status;
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out_put:
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nfs4_fl_put_deviceid(dsaddr);
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goto out;
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}
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static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
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{
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int i;
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for (i = 0; i < fl->num_fh; i++) {
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if (!fl->fh_array[i])
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break;
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kfree(fl->fh_array[i]);
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}
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kfree(fl->fh_array);
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fl->fh_array = NULL;
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}
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static void
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_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
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{
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filelayout_free_fh_array(fl);
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kfree(fl);
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}
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static int
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filelayout_decode_layout(struct pnfs_layout_hdr *flo,
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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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{
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uint32_t *p = (uint32_t *)lgr->layout.buf;
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uint32_t nfl_util;
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int i;
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dprintk("%s: set_layout_map Begin\n", __func__);
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memcpy(id, p, sizeof(*id));
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p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
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print_deviceid(id);
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nfl_util = be32_to_cpup(p++);
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if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
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fl->commit_through_mds = 1;
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if (nfl_util & NFL4_UFLG_DENSE)
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fl->stripe_type = STRIPE_DENSE;
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else
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fl->stripe_type = STRIPE_SPARSE;
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fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
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fl->first_stripe_index = be32_to_cpup(p++);
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p = xdr_decode_hyper(p, &fl->pattern_offset);
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fl->num_fh = be32_to_cpup(p++);
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dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
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__func__, nfl_util, fl->num_fh, fl->first_stripe_index,
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fl->pattern_offset);
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fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
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GFP_KERNEL);
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if (!fl->fh_array)
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return -ENOMEM;
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for (i = 0; i < fl->num_fh; i++) {
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/* Do we want to use a mempool here? */
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fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
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if (!fl->fh_array[i]) {
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filelayout_free_fh_array(fl);
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return -ENOMEM;
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}
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fl->fh_array[i]->size = be32_to_cpup(p++);
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if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
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printk(KERN_ERR "Too big fh %d received %d\n",
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i, fl->fh_array[i]->size);
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filelayout_free_fh_array(fl);
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return -EIO;
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}
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memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
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p += XDR_QUADLEN(fl->fh_array[i]->size);
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dprintk("DEBUG: %s: fh len %d\n", __func__,
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fl->fh_array[i]->size);
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}
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return 0;
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}
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static struct pnfs_layout_segment *
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filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
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struct nfs4_layoutget_res *lgr)
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{
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struct nfs4_filelayout_segment *fl;
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int rc;
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struct nfs4_deviceid id;
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dprintk("--> %s\n", __func__);
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fl = kzalloc(sizeof(*fl), GFP_KERNEL);
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if (!fl)
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return NULL;
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rc = filelayout_decode_layout(layoutid, fl, lgr, &id);
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if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id)) {
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_filelayout_free_lseg(fl);
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return NULL;
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}
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return &fl->generic_hdr;
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}
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static void
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filelayout_free_lseg(struct pnfs_layout_segment *lseg)
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{
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struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
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dprintk("--> %s\n", __func__);
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nfs4_fl_put_deviceid(fl->dsaddr);
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_filelayout_free_lseg(fl);
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}
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/*
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* filelayout_pg_test(). Called by nfs_can_coalesce_requests()
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*
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* return 1 : coalesce page
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* return 0 : don't coalesce page
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*/
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int
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filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
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struct nfs_page *req)
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{
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u64 p_stripe, r_stripe;
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u32 stripe_unit;
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if (!pgio->pg_lseg)
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return 1;
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p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
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r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
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stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
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do_div(p_stripe, stripe_unit);
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do_div(r_stripe, stripe_unit);
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return (p_stripe == r_stripe);
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}
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static struct pnfs_layoutdriver_type filelayout_type = {
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.id = LAYOUT_NFSV4_1_FILES,
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.name = "LAYOUT_NFSV4_1_FILES",
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.owner = THIS_MODULE,
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.alloc_lseg = filelayout_alloc_lseg,
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.free_lseg = filelayout_free_lseg,
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.pg_test = filelayout_pg_test,
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.read_pagelist = filelayout_read_pagelist,
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};
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static int __init nfs4filelayout_init(void)
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{
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printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
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__func__);
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return pnfs_register_layoutdriver(&filelayout_type);
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}
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static void __exit nfs4filelayout_exit(void)
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{
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printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
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__func__);
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pnfs_unregister_layoutdriver(&filelayout_type);
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}
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module_init(nfs4filelayout_init);
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module_exit(nfs4filelayout_exit);
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