| /* |
| * 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 "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(); |
| } |
| |
| 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; |
| case -NFS4ERR_RETRY_UNCACHED_REP: |
| 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) |
| { |
| 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, |
| 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) { |
| 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, |
| 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); |
| } |
| |
| 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)); |
| nfs_commitdata_release(wdata); |
| } |
| |
| 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, |
| }; |
| |
| struct rpc_call_ops filelayout_commit_call_ops = { |
| .rpc_call_prepare = filelayout_write_prepare, |
| .rpc_call_done = filelayout_write_call_done, |
| .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 "%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 "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 "%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); |