diff options
Diffstat (limited to 'fs/nfs/nfs4filelayout.c')
| -rw-r--r-- | fs/nfs/nfs4filelayout.c | 1109 |
1 files changed, 0 insertions, 1109 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c deleted file mode 100644 index 5acfd9ea8a3..00000000000 --- a/fs/nfs/nfs4filelayout.c +++ /dev/null @@ -1,1109 +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 <linux/nfs_page.h> -#include <linux/module.h> - -#include <linux/sunrpc/metrics.h> - -#include "internal.h" -#include "delegation.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 stripe_no; - u32 rem; - - offset -= flseg->pattern_offset; - stripe_no = div_u64(offset, stripe_width); - div_u64_rem(offset, flseg->stripe_unit, &rem); - - return stripe_no * flseg->stripe_unit + rem; -} - -/* 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(); -} - -static int filelayout_async_handle_error(struct rpc_task *task, - struct nfs4_state *state, - struct nfs_client *clp, - int *reset) -{ - struct nfs_server *mds_server = NFS_SERVER(state->inode); - struct nfs_client *mds_client = mds_server->nfs_client; - - if (task->tk_status >= 0) - return 0; - *reset = 0; - - switch (task->tk_status) { - /* MDS state errors */ - case -NFS4ERR_DELEG_REVOKED: - case -NFS4ERR_ADMIN_REVOKED: - case -NFS4ERR_BAD_STATEID: - nfs_remove_bad_delegation(state->inode); - case -NFS4ERR_OPENMODE: - nfs4_schedule_stateid_recovery(mds_server, state); - goto wait_on_recovery; - case -NFS4ERR_EXPIRED: - nfs4_schedule_stateid_recovery(mds_server, state); - nfs4_schedule_lease_recovery(mds_client); - goto wait_on_recovery; - /* DS session errors */ - 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; - case -NFS4ERR_RETRY_UNCACHED_REP: - break; - default: - dprintk("%s DS error. Retry through MDS %d\n", __func__, - task->tk_status); - *reset = 1; - break; - } -out: - task->tk_status = 0; - return -EAGAIN; -wait_on_recovery: - rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL); - if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0) - rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task); - goto out; -} - -/* NFS_PROTO call done callback routines */ - -static int filelayout_read_done_cb(struct rpc_task *task, - struct nfs_read_data *data) -{ - 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) { - pnfs_set_lo_fail(data->lseg); - nfs4_reset_read(task, data); - } - rpc_restart_call_prepare(task); - return -EAGAIN; - } - - return 0; -} - -/* - * We reference the rpc_cred of the first WRITE that triggers the need for - * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. - * rfc5661 is not clear about which credential should be used. - */ -static void -filelayout_set_layoutcommit(struct nfs_write_data *wdata) -{ - if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds || - wdata->res.verf->committed == NFS_FILE_SYNC) - return; - - pnfs_set_layoutcommit(wdata); - dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino, - (unsigned long) NFS_I(wdata->inode)->layout->plh_lwb); -} - -/* - * 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, - 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_count_stats(struct rpc_task *task, void *data) -{ - struct nfs_read_data *rdata = (struct nfs_read_data *)data; - - rpc_count_iostats(task, NFS_SERVER(rdata->inode)->client->cl_metrics); -} - -static void filelayout_read_release(void *data) -{ - struct nfs_read_data *rdata = (struct nfs_read_data *)data; - - put_lseg(rdata->lseg); - 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) { - dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", - __func__, data->ds_clp, data->ds_clp->cl_session); - if (reset) { - pnfs_set_lo_fail(data->lseg); - nfs4_reset_write(task, data); - } - rpc_restart_call_prepare(task); - return -EAGAIN; - } - - filelayout_set_layoutcommit(data); - return 0; -} - -/* Fake up some data that will cause nfs_commit_release to retry the writes. */ -static void prepare_to_resend_writes(struct nfs_write_data *data) -{ - struct nfs_page *first = nfs_list_entry(data->pages.next); - - data->task.tk_status = 0; - memcpy(data->verf.verifier, first->wb_verf.verifier, - sizeof(first->wb_verf.verifier)); - data->verf.verifier[0]++; /* ensure verifier mismatch */ -} - -static int filelayout_commit_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) { - dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", - __func__, data->ds_clp, data->ds_clp->cl_session); - if (reset) { - prepare_to_resend_writes(data); - pnfs_set_lo_fail(data->lseg); - } else - rpc_restart_call_prepare(task); - 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, - 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_count_stats(struct rpc_task *task, void *data) -{ - struct nfs_write_data *wdata = (struct nfs_write_data *)data; - - rpc_count_iostats(task, NFS_SERVER(wdata->inode)->client->cl_metrics); -} - -static void filelayout_write_release(void *data) -{ - struct nfs_write_data *wdata = (struct nfs_write_data *)data; - - put_lseg(wdata->lseg); - wdata->mds_ops->rpc_release(data); -} - -static void filelayout_commit_release(void *data) -{ - struct nfs_write_data *wdata = (struct nfs_write_data *)data; - - nfs_commit_release_pages(wdata); - if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding)) - nfs_commit_clear_lock(NFS_I(wdata->inode)); - put_lseg(wdata->lseg); - nfs_commitdata_release(wdata); -} - -static const struct rpc_call_ops filelayout_read_call_ops = { - .rpc_call_prepare = filelayout_read_prepare, - .rpc_call_done = filelayout_read_call_done, - .rpc_count_stats = filelayout_read_count_stats, - .rpc_release = filelayout_read_release, -}; - -static const struct rpc_call_ops filelayout_write_call_ops = { - .rpc_call_prepare = filelayout_write_prepare, - .rpc_call_done = filelayout_write_call_done, - .rpc_count_stats = filelayout_write_count_stats, - .rpc_release = filelayout_write_release, -}; - -static const struct rpc_call_ops filelayout_commit_call_ops = { - .rpc_call_prepare = filelayout_write_prepare, - .rpc_call_done = filelayout_write_call_done, - .rpc_count_stats = filelayout_write_count_stats, - .rpc_release = filelayout_commit_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); - - if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags)) - return PNFS_NOT_ATTEMPTED; - - /* 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: %s\n", __func__, ds->ds_remotestr); - - /* 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; - - if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags)) - return PNFS_NOT_ATTEMPTED; - - /* 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 "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); - return PNFS_NOT_ATTEMPTED; - } - dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__, - data->inode->i_ino, sync, (size_t) data->args.count, offset, - ds->ds_remotestr); - - 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); - - /* 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, - gfp_t gfp_flags) -{ - struct nfs4_deviceid_node *d; - struct nfs4_file_layout_dsaddr *dsaddr; - int status = -EINVAL; - struct nfs_server *nfss = NFS_SERVER(lo->plh_inode); - - dprintk("--> %s\n", __func__); - - /* FIXME: remove this check when layout segment support is added */ - if (lgr->range.offset != 0 || - 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 nfs4_fl_commit_bucket), 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].written); - INIT_LIST_HEAD(&fl->commit_buckets[i].committing); - } - } - 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); -} - -static 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); -} - -static 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 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; -} - -/* The generic layer is about to remove the req from the commit list. - * If this will make the bucket empty, it will need to put the lseg reference. - */ -static void -filelayout_clear_request_commit(struct nfs_page *req) -{ - struct pnfs_layout_segment *freeme = NULL; - struct inode *inode = req->wb_context->dentry->d_inode; - - spin_lock(&inode->i_lock); - if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags)) - goto out; - if (list_is_singular(&req->wb_list)) { - struct pnfs_layout_segment *lseg; - - /* From here we can find the bucket, but for the moment, - * since there is only one relevant lseg... - */ - list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { - if (lseg->pls_range.iomode == IOMODE_RW) { - freeme = lseg; - break; - } - } - } -out: - nfs_request_remove_commit_list(req); - spin_unlock(&inode->i_lock); - put_lseg(freeme); -} - -static struct list_head * -filelayout_choose_commit_list(struct nfs_page *req, - struct pnfs_layout_segment *lseg) -{ - struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); - u32 i, j; - struct list_head *list; - - if (fl->commit_through_mds) - return &NFS_I(req->wb_context->dentry->d_inode)->commit_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].written; - if (list_empty(list)) { - /* Non-empty buckets hold a reference on the lseg. That ref - * is normally transferred to the COMMIT call and released - * there. It could also be released if the last req is pulled - * off due to a rewrite, in which case it will be done in - * filelayout_remove_commit_req - */ - get_lseg(lseg); - } - set_bit(PG_COMMIT_TO_DS, &req->wb_flags); - return list; -} - -static void -filelayout_mark_request_commit(struct nfs_page *req, - struct pnfs_layout_segment *lseg) -{ - struct list_head *list; - - list = filelayout_choose_commit_list(req, lseg); - nfs_request_add_commit_list(req, 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); - filelayout_commit_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_locked(struct inode *inode) -{ - struct pnfs_layout_segment *lseg; - - list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) - if (lseg->pls_range.iomode == IOMODE_RW) - return lseg; - return NULL; -} - -static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode) -{ - struct pnfs_layout_segment *rv; - - spin_lock(&inode->i_lock); - rv = find_only_write_lseg_locked(inode); - if (rv) - get_lseg(rv); - spin_unlock(&inode->i_lock); - return rv; -} - -static int -filelayout_scan_ds_commit_list(struct nfs4_fl_commit_bucket *bucket, int max, - spinlock_t *lock) -{ - struct list_head *src = &bucket->written; - struct list_head *dst = &bucket->committing; - struct nfs_page *req, *tmp; - int ret = 0; - - list_for_each_entry_safe(req, tmp, src, wb_list) { - if (!nfs_lock_request(req)) - continue; - if (cond_resched_lock(lock)) - list_safe_reset_next(req, tmp, wb_list); - nfs_request_remove_commit_list(req); - clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); - nfs_list_add_request(req, dst); - ret++; - if (ret == max) - break; - } - return ret; -} - -/* Move reqs from written to committing lists, returning count of number moved. - * Note called with i_lock held. - */ -static int filelayout_scan_commit_lists(struct inode *inode, int max, - spinlock_t *lock) -{ - struct pnfs_layout_segment *lseg; - struct nfs4_filelayout_segment *fl; - int i, rv = 0, cnt; - - lseg = find_only_write_lseg_locked(inode); - if (!lseg) - goto out_done; - fl = FILELAYOUT_LSEG(lseg); - if (fl->commit_through_mds) - goto out_done; - for (i = 0; i < fl->number_of_buckets && max != 0; i++) { - cnt = filelayout_scan_ds_commit_list(&fl->commit_buckets[i], - max, lock); - max -= cnt; - rv += cnt; - } -out_done: - return rv; -} - -static unsigned 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; - unsigned int nreq = 0; - - /* 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].committing)) - continue; - data = nfs_commitdata_alloc(); - if (!data) - break; - data->ds_commit_index = i; - data->lseg = lseg; - list_add(&data->pages, list); - nreq++; - } - - /* Clean up on error */ - for (j = i; j < fl->number_of_buckets; j++) { - if (list_empty(&fl->commit_buckets[i].committing)) - continue; - nfs_retry_commit(&fl->commit_buckets[i].committing, lseg); - put_lseg(lseg); /* associated with emptying bucket */ - } - put_lseg(lseg); - /* Caller will clean up entries put on list */ - return nreq; -} - -/* 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); - unsigned int nreq = 0; - - if (!list_empty(mds_pages)) { - data = nfs_commitdata_alloc(); - if (data != NULL) { - data->lseg = NULL; - list_add(&data->pages, &list); - nreq++; - } else - nfs_retry_commit(mds_pages, NULL); - } - - nreq += alloc_ds_commits(inode, &list); - - if (nreq == 0) { - nfs_commit_clear_lock(NFS_I(inode)); - goto out; - } - - atomic_add(nreq, &NFS_I(inode)->commits_outstanding); - - list_for_each_entry_safe(data, tmp, &list, pages) { - list_del_init(&data->pages); - 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].committing, data->lseg); - filelayout_initiate_commit(data, how); - } - } -out: - return PNFS_ATTEMPTED; -} - -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_request_commit = filelayout_mark_request_commit, - .clear_request_commit = filelayout_clear_request_commit, - .scan_commit_lists = filelayout_scan_commit_lists, - .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); |