diff options
Diffstat (limited to 'fs/nfs/nfs4filelayout.c')
| -rw-r--r-- | fs/nfs/nfs4filelayout.c | 581 |
1 files changed, 0 insertions, 581 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c deleted file mode 100644 index 42855846481..00000000000 --- a/fs/nfs/nfs4filelayout.c +++ /dev/null @@ -1,581 +0,0 @@ -/* - * Module for the pnfs nfs4 file layout driver. - * Defines all I/O and Policy interface operations, plus code - * to register itself with the pNFS client. - * - * Copyright (c) 2002 - * The Regents of the University of Michigan - * All Rights Reserved - * - * Dean Hildebrand <dhildebz@umich.edu> - * - * Permission is granted to use, copy, create derivative works, and - * redistribute this software and such derivative works for any purpose, - * so long as the name of the University of Michigan is not used in - * any advertising or publicity pertaining to the use or distribution - * of this software without specific, written prior authorization. If - * the above copyright notice or any other identification of the - * University of Michigan is included in any copy of any portion of - * this software, then the disclaimer below must also be included. - * - * This software is provided as is, without representation or warranty - * of any kind either express or implied, including without limitation - * the implied warranties of merchantability, fitness for a particular - * purpose, or noninfringement. The Regents of the University of - * Michigan shall not be liable for any damages, including special, - * indirect, incidental, or consequential damages, with respect to any - * claim arising out of or in connection with the use of the software, - * even if it has been or is hereafter advised of the possibility of - * such damages. - */ - -#include <linux/nfs_fs.h> - -#include "internal.h" -#include "nfs4filelayout.h" - -#define NFSDBG_FACILITY NFSDBG_PNFS_LD - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); -MODULE_DESCRIPTION("The NFSv4 file layout driver"); - -#define FILELAYOUT_POLL_RETRY_MAX (15*HZ) - -static loff_t -filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, - loff_t offset) -{ - u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; - u64 tmp; - - offset -= flseg->pattern_offset; - tmp = offset; - do_div(tmp, stripe_width); - - return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit); -} - -/* This function is used by the layout driver to calculate the - * offset of the file on the dserver based on whether the - * layout type is STRIPE_DENSE or STRIPE_SPARSE - */ -static loff_t -filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) -{ - struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); - - switch (flseg->stripe_type) { - case STRIPE_SPARSE: - return offset; - - case STRIPE_DENSE: - return filelayout_get_dense_offset(flseg, offset); - } - - BUG(); -} - -/* For data server errors we don't recover from */ -static void -filelayout_set_lo_fail(struct pnfs_layout_segment *lseg) -{ - if (lseg->pls_range.iomode == IOMODE_RW) { - dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__); - set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); - } else { - dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__); - set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); - } -} - -static int filelayout_async_handle_error(struct rpc_task *task, - struct nfs4_state *state, - struct nfs_client *clp, - int *reset) -{ - if (task->tk_status >= 0) - return 0; - - *reset = 0; - - switch (task->tk_status) { - case -NFS4ERR_BADSESSION: - case -NFS4ERR_BADSLOT: - case -NFS4ERR_BAD_HIGH_SLOT: - case -NFS4ERR_DEADSESSION: - case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: - case -NFS4ERR_SEQ_FALSE_RETRY: - case -NFS4ERR_SEQ_MISORDERED: - dprintk("%s ERROR %d, Reset session. Exchangeid " - "flags 0x%x\n", __func__, task->tk_status, - clp->cl_exchange_flags); - nfs4_schedule_session_recovery(clp->cl_session); - break; - case -NFS4ERR_DELAY: - case -NFS4ERR_GRACE: - case -EKEYEXPIRED: - rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); - break; - default: - dprintk("%s DS error. Retry through MDS %d\n", __func__, - task->tk_status); - *reset = 1; - break; - } - task->tk_status = 0; - return -EAGAIN; -} - -/* NFS_PROTO call done callback routines */ - -static int filelayout_read_done_cb(struct rpc_task *task, - struct nfs_read_data *data) -{ - struct nfs_client *clp = data->ds_clp; - int reset = 0; - - dprintk("%s DS read\n", __func__); - - if (filelayout_async_handle_error(task, data->args.context->state, - data->ds_clp, &reset) == -EAGAIN) { - 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_read(task, data); - clp = NFS_SERVER(data->inode)->nfs_client; - } - nfs_restart_rpc(task, clp); - return -EAGAIN; - } - - return 0; -} - -/* - * Call ops for the async read/write cases - * In the case of dense layouts, the offset needs to be reset to its - * original value. - */ -static void filelayout_read_prepare(struct rpc_task *task, void *data) -{ - struct nfs_read_data *rdata = (struct nfs_read_data *)data; - - rdata->read_done_cb = filelayout_read_done_cb; - - if (nfs41_setup_sequence(rdata->ds_clp->cl_session, - &rdata->args.seq_args, &rdata->res.seq_res, - 0, task)) - return; - - rpc_call_start(task); -} - -static void filelayout_read_call_done(struct rpc_task *task, void *data) -{ - struct nfs_read_data *rdata = (struct nfs_read_data *)data; - - dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); - - /* Note this may cause RPC to be resent */ - rdata->mds_ops->rpc_call_done(task, data); -} - -static void filelayout_read_release(void *data) -{ - struct nfs_read_data *rdata = (struct nfs_read_data *)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) -{ - 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; - - dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", - __func__, data->inode->i_ino, - data->args.pgbase, (size_t)data->args.count, offset); - - /* 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) { - /* Either layout fh index faulty, or ds connect failed */ - 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 USE DS:ip %x %hu\n", __func__, - ntohl(ds->ds_ip_addr), ntohs(ds->ds_port)); - - /* No multipath support. Use first DS */ - data->ds_clp = ds->ds_clp; - fh = nfs4_fl_select_ds_fh(lseg, j); - if (fh) - data->args.fh = fh; - - data->args.offset = filelayout_get_dserver_offset(lseg, offset); - data->mds_offset = offset; - - /* Perform an asynchronous read to ds */ - status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient, - &filelayout_read_call_ops); - BUG_ON(status != 0); - return PNFS_ATTEMPTED; -} - -/* Perform async writes. */ -static enum pnfs_try_status -filelayout_write_pagelist(struct nfs_write_data *data, int sync) -{ - 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; -} - -/* - * filelayout_check_layout() - * - * Make sure layout segment parameters are sane WRT the device. - * At this point no generic layer initialization of the lseg has occurred, - * and nothing has been added to the layout_hdr cache. - * - */ -static int -filelayout_check_layout(struct pnfs_layout_hdr *lo, - struct nfs4_filelayout_segment *fl, - struct nfs4_layoutget_res *lgr, - struct nfs4_deviceid *id) -{ - struct nfs4_file_layout_dsaddr *dsaddr; - int status = -EINVAL; - struct nfs_server *nfss = NFS_SERVER(lo->plh_inode); - - dprintk("--> %s\n", __func__); - - if (fl->pattern_offset > lgr->range.offset) { - dprintk("%s pattern_offset %lld to 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 */ - dsaddr = nfs4_fl_find_get_deviceid(id); - if (dsaddr == NULL) { - dsaddr = get_device_info(lo->plh_inode, id); - if (dsaddr == NULL) - goto out; - } - fl->dsaddr = dsaddr; - - if (fl->first_stripe_index < 0 || - fl->first_stripe_index >= dsaddr->stripe_count) { - dprintk("%s Bad first_stripe_index %d\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) -{ - uint32_t *p = (uint32_t *)lgr->layout.buf; - uint32_t nfl_util; - int i; - - dprintk("%s: set_layout_map Begin\n", __func__); - - memcpy(id, p, sizeof(*id)); - p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); - 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); - - fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *), - GFP_KERNEL); - if (!fl->fh_array) - return -ENOMEM; - - 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_KERNEL); - if (!fl->fh_array[i]) { - filelayout_free_fh_array(fl); - return -ENOMEM; - } - fl->fh_array[i]->size = be32_to_cpup(p++); - if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { - printk(KERN_ERR "Too big fh %d received %d\n", - i, fl->fh_array[i]->size); - filelayout_free_fh_array(fl); - return -EIO; - } - memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); - p += XDR_QUADLEN(fl->fh_array[i]->size); - dprintk("DEBUG: %s: fh len %d\n", __func__, - fl->fh_array[i]->size); - } - - return 0; -} - -static struct pnfs_layout_segment * -filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, - struct nfs4_layoutget_res *lgr) -{ - struct nfs4_filelayout_segment *fl; - int rc; - struct nfs4_deviceid id; - - dprintk("--> %s\n", __func__); - fl = kzalloc(sizeof(*fl), GFP_KERNEL); - if (!fl) - return NULL; - - rc = filelayout_decode_layout(layoutid, fl, lgr, &id); - if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id)) { - _filelayout_free_lseg(fl); - return NULL; - } - return &fl->generic_hdr; -} - -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); - _filelayout_free_lseg(fl); -} - -/* - * filelayout_pg_test(). Called by nfs_can_coalesce_requests() - * - * return 1 : coalesce page - * return 0 : don't coalesce page - */ -int -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 (!pgio->pg_lseg) - return 1; - 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); -} - -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_test = filelayout_pg_test, - .read_pagelist = filelayout_read_pagelist, - .write_pagelist = filelayout_write_pagelist, -}; - -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_init(nfs4filelayout_init); -module_exit(nfs4filelayout_exit); |