Dean Hildebrand | 7ab672c | 2010-10-20 00:18:00 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Module for the pnfs nfs4 file layout driver. |
| 3 | * Defines all I/O and Policy interface operations, plus code |
| 4 | * to register itself with the pNFS client. |
| 5 | * |
| 6 | * Copyright (c) 2002 |
| 7 | * The Regents of the University of Michigan |
| 8 | * All Rights Reserved |
| 9 | * |
| 10 | * Dean Hildebrand <dhildebz@umich.edu> |
| 11 | * |
| 12 | * Permission is granted to use, copy, create derivative works, and |
| 13 | * redistribute this software and such derivative works for any purpose, |
| 14 | * so long as the name of the University of Michigan is not used in |
| 15 | * any advertising or publicity pertaining to the use or distribution |
| 16 | * of this software without specific, written prior authorization. If |
| 17 | * the above copyright notice or any other identification of the |
| 18 | * University of Michigan is included in any copy of any portion of |
| 19 | * this software, then the disclaimer below must also be included. |
| 20 | * |
| 21 | * This software is provided as is, without representation or warranty |
| 22 | * of any kind either express or implied, including without limitation |
| 23 | * the implied warranties of merchantability, fitness for a particular |
| 24 | * purpose, or noninfringement. The Regents of the University of |
| 25 | * Michigan shall not be liable for any damages, including special, |
| 26 | * indirect, incidental, or consequential damages, with respect to any |
| 27 | * claim arising out of or in connection with the use of the software, |
| 28 | * even if it has been or is hereafter advised of the possibility of |
| 29 | * such damages. |
| 30 | */ |
| 31 | |
| 32 | #include <linux/nfs_fs.h> |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 33 | |
| 34 | #include "internal.h" |
| 35 | #include "nfs4filelayout.h" |
Dean Hildebrand | 7ab672c | 2010-10-20 00:18:00 -0400 | [diff] [blame] | 36 | |
| 37 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD |
| 38 | |
| 39 | MODULE_LICENSE("GPL"); |
| 40 | MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); |
| 41 | MODULE_DESCRIPTION("The NFSv4 file layout driver"); |
| 42 | |
Andy Adamson | cbdabc7 | 2011-03-01 01:34:20 +0000 | [diff] [blame] | 43 | #define FILELAYOUT_POLL_RETRY_MAX (15*HZ) |
| 44 | |
Fred Isaman | cfe7f41 | 2011-03-01 01:34:18 +0000 | [diff] [blame] | 45 | static loff_t |
| 46 | filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, |
| 47 | loff_t offset) |
| 48 | { |
| 49 | u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; |
| 50 | u64 tmp; |
| 51 | |
| 52 | offset -= flseg->pattern_offset; |
| 53 | tmp = offset; |
| 54 | do_div(tmp, stripe_width); |
| 55 | |
| 56 | return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit); |
| 57 | } |
| 58 | |
| 59 | /* This function is used by the layout driver to calculate the |
| 60 | * offset of the file on the dserver based on whether the |
| 61 | * layout type is STRIPE_DENSE or STRIPE_SPARSE |
| 62 | */ |
| 63 | static loff_t |
| 64 | filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) |
| 65 | { |
| 66 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| 67 | |
| 68 | switch (flseg->stripe_type) { |
| 69 | case STRIPE_SPARSE: |
| 70 | return offset; |
| 71 | |
| 72 | case STRIPE_DENSE: |
| 73 | return filelayout_get_dense_offset(flseg, offset); |
| 74 | } |
| 75 | |
| 76 | BUG(); |
| 77 | } |
| 78 | |
Andy Adamson | cbdabc7 | 2011-03-01 01:34:20 +0000 | [diff] [blame] | 79 | /* For data server errors we don't recover from */ |
| 80 | static void |
| 81 | filelayout_set_lo_fail(struct pnfs_layout_segment *lseg) |
| 82 | { |
| 83 | if (lseg->pls_range.iomode == IOMODE_RW) { |
| 84 | dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__); |
| 85 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); |
| 86 | } else { |
| 87 | dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__); |
| 88 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | static int filelayout_async_handle_error(struct rpc_task *task, |
| 93 | struct nfs4_state *state, |
| 94 | struct nfs_client *clp, |
| 95 | int *reset) |
| 96 | { |
| 97 | if (task->tk_status >= 0) |
| 98 | return 0; |
| 99 | |
| 100 | *reset = 0; |
| 101 | |
| 102 | switch (task->tk_status) { |
| 103 | case -NFS4ERR_BADSESSION: |
| 104 | case -NFS4ERR_BADSLOT: |
| 105 | case -NFS4ERR_BAD_HIGH_SLOT: |
| 106 | case -NFS4ERR_DEADSESSION: |
| 107 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| 108 | case -NFS4ERR_SEQ_FALSE_RETRY: |
| 109 | case -NFS4ERR_SEQ_MISORDERED: |
| 110 | dprintk("%s ERROR %d, Reset session. Exchangeid " |
| 111 | "flags 0x%x\n", __func__, task->tk_status, |
| 112 | clp->cl_exchange_flags); |
| 113 | nfs4_schedule_session_recovery(clp->cl_session); |
| 114 | break; |
| 115 | case -NFS4ERR_DELAY: |
| 116 | case -NFS4ERR_GRACE: |
| 117 | case -EKEYEXPIRED: |
| 118 | rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); |
| 119 | break; |
| 120 | default: |
| 121 | dprintk("%s DS error. Retry through MDS %d\n", __func__, |
| 122 | task->tk_status); |
| 123 | *reset = 1; |
| 124 | break; |
| 125 | } |
| 126 | task->tk_status = 0; |
| 127 | return -EAGAIN; |
| 128 | } |
| 129 | |
| 130 | /* NFS_PROTO call done callback routines */ |
| 131 | |
| 132 | static int filelayout_read_done_cb(struct rpc_task *task, |
| 133 | struct nfs_read_data *data) |
| 134 | { |
| 135 | struct nfs_client *clp = data->ds_clp; |
| 136 | int reset = 0; |
| 137 | |
| 138 | dprintk("%s DS read\n", __func__); |
| 139 | |
| 140 | if (filelayout_async_handle_error(task, data->args.context->state, |
| 141 | data->ds_clp, &reset) == -EAGAIN) { |
| 142 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", |
| 143 | __func__, data->ds_clp, data->ds_clp->cl_session); |
| 144 | if (reset) { |
| 145 | filelayout_set_lo_fail(data->lseg); |
| 146 | nfs4_reset_read(task, data); |
| 147 | clp = NFS_SERVER(data->inode)->nfs_client; |
| 148 | } |
| 149 | nfs_restart_rpc(task, clp); |
| 150 | return -EAGAIN; |
| 151 | } |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 156 | /* |
Andy Adamson | 863a3c6 | 2011-03-23 13:27:54 +0000 | [diff] [blame^] | 157 | * We reference the rpc_cred of the first WRITE that triggers the need for |
| 158 | * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. |
| 159 | * rfc5661 is not clear about which credential should be used. |
| 160 | */ |
| 161 | static void |
| 162 | filelayout_set_layoutcommit(struct nfs_write_data *wdata) |
| 163 | { |
| 164 | if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds || |
| 165 | wdata->res.verf->committed == NFS_FILE_SYNC) |
| 166 | return; |
| 167 | |
| 168 | pnfs_set_layoutcommit(wdata); |
| 169 | dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino, |
| 170 | (unsigned long) wdata->lseg->pls_end_pos); |
| 171 | } |
| 172 | |
| 173 | /* |
Andy Adamson | dc70d7b | 2011-03-01 01:34:19 +0000 | [diff] [blame] | 174 | * Call ops for the async read/write cases |
| 175 | * In the case of dense layouts, the offset needs to be reset to its |
| 176 | * original value. |
| 177 | */ |
| 178 | static void filelayout_read_prepare(struct rpc_task *task, void *data) |
| 179 | { |
| 180 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; |
| 181 | |
Andy Adamson | cbdabc7 | 2011-03-01 01:34:20 +0000 | [diff] [blame] | 182 | rdata->read_done_cb = filelayout_read_done_cb; |
| 183 | |
Andy Adamson | dc70d7b | 2011-03-01 01:34:19 +0000 | [diff] [blame] | 184 | if (nfs41_setup_sequence(rdata->ds_clp->cl_session, |
| 185 | &rdata->args.seq_args, &rdata->res.seq_res, |
| 186 | 0, task)) |
| 187 | return; |
| 188 | |
| 189 | rpc_call_start(task); |
| 190 | } |
| 191 | |
| 192 | static void filelayout_read_call_done(struct rpc_task *task, void *data) |
| 193 | { |
| 194 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; |
| 195 | |
| 196 | dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); |
| 197 | |
| 198 | /* Note this may cause RPC to be resent */ |
| 199 | rdata->mds_ops->rpc_call_done(task, data); |
| 200 | } |
| 201 | |
| 202 | static void filelayout_read_release(void *data) |
| 203 | { |
| 204 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; |
| 205 | |
| 206 | rdata->mds_ops->rpc_release(data); |
| 207 | } |
| 208 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 209 | static int filelayout_write_done_cb(struct rpc_task *task, |
| 210 | struct nfs_write_data *data) |
| 211 | { |
| 212 | int reset = 0; |
| 213 | |
| 214 | if (filelayout_async_handle_error(task, data->args.context->state, |
| 215 | data->ds_clp, &reset) == -EAGAIN) { |
| 216 | struct nfs_client *clp; |
| 217 | |
| 218 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", |
| 219 | __func__, data->ds_clp, data->ds_clp->cl_session); |
| 220 | if (reset) { |
| 221 | filelayout_set_lo_fail(data->lseg); |
| 222 | nfs4_reset_write(task, data); |
| 223 | clp = NFS_SERVER(data->inode)->nfs_client; |
| 224 | } else |
| 225 | clp = data->ds_clp; |
| 226 | nfs_restart_rpc(task, clp); |
| 227 | return -EAGAIN; |
| 228 | } |
| 229 | |
Andy Adamson | 863a3c6 | 2011-03-23 13:27:54 +0000 | [diff] [blame^] | 230 | filelayout_set_layoutcommit(data); |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 231 | return 0; |
| 232 | } |
| 233 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 234 | /* Fake up some data that will cause nfs_commit_release to retry the writes. */ |
| 235 | static void prepare_to_resend_writes(struct nfs_write_data *data) |
| 236 | { |
| 237 | struct nfs_page *first = nfs_list_entry(data->pages.next); |
| 238 | |
| 239 | data->task.tk_status = 0; |
| 240 | memcpy(data->verf.verifier, first->wb_verf.verifier, |
| 241 | sizeof(first->wb_verf.verifier)); |
| 242 | data->verf.verifier[0]++; /* ensure verifier mismatch */ |
| 243 | } |
| 244 | |
| 245 | static int filelayout_commit_done_cb(struct rpc_task *task, |
| 246 | struct nfs_write_data *data) |
| 247 | { |
| 248 | int reset = 0; |
| 249 | |
| 250 | if (filelayout_async_handle_error(task, data->args.context->state, |
| 251 | data->ds_clp, &reset) == -EAGAIN) { |
| 252 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", |
| 253 | __func__, data->ds_clp, data->ds_clp->cl_session); |
| 254 | if (reset) { |
| 255 | prepare_to_resend_writes(data); |
| 256 | filelayout_set_lo_fail(data->lseg); |
| 257 | } else |
| 258 | nfs_restart_rpc(task, data->ds_clp); |
| 259 | return -EAGAIN; |
| 260 | } |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 265 | static void filelayout_write_prepare(struct rpc_task *task, void *data) |
| 266 | { |
| 267 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; |
| 268 | |
| 269 | if (nfs41_setup_sequence(wdata->ds_clp->cl_session, |
| 270 | &wdata->args.seq_args, &wdata->res.seq_res, |
| 271 | 0, task)) |
| 272 | return; |
| 273 | |
| 274 | rpc_call_start(task); |
| 275 | } |
| 276 | |
| 277 | static void filelayout_write_call_done(struct rpc_task *task, void *data) |
| 278 | { |
| 279 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; |
| 280 | |
| 281 | /* Note this may cause RPC to be resent */ |
| 282 | wdata->mds_ops->rpc_call_done(task, data); |
| 283 | } |
| 284 | |
| 285 | static void filelayout_write_release(void *data) |
| 286 | { |
| 287 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; |
| 288 | |
| 289 | wdata->mds_ops->rpc_release(data); |
| 290 | } |
| 291 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 292 | static void filelayout_commit_release(void *data) |
| 293 | { |
| 294 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; |
| 295 | |
| 296 | nfs_commit_release_pages(wdata); |
| 297 | if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding)) |
| 298 | nfs_commit_clear_lock(NFS_I(wdata->inode)); |
| 299 | nfs_commitdata_release(wdata); |
| 300 | } |
| 301 | |
Andy Adamson | dc70d7b | 2011-03-01 01:34:19 +0000 | [diff] [blame] | 302 | struct rpc_call_ops filelayout_read_call_ops = { |
| 303 | .rpc_call_prepare = filelayout_read_prepare, |
| 304 | .rpc_call_done = filelayout_read_call_done, |
| 305 | .rpc_release = filelayout_read_release, |
| 306 | }; |
| 307 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 308 | struct rpc_call_ops filelayout_write_call_ops = { |
| 309 | .rpc_call_prepare = filelayout_write_prepare, |
| 310 | .rpc_call_done = filelayout_write_call_done, |
| 311 | .rpc_release = filelayout_write_release, |
| 312 | }; |
| 313 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 314 | struct rpc_call_ops filelayout_commit_call_ops = { |
| 315 | .rpc_call_prepare = filelayout_write_prepare, |
| 316 | .rpc_call_done = filelayout_write_call_done, |
| 317 | .rpc_release = filelayout_commit_release, |
| 318 | }; |
| 319 | |
Andy Adamson | dc70d7b | 2011-03-01 01:34:19 +0000 | [diff] [blame] | 320 | static enum pnfs_try_status |
| 321 | filelayout_read_pagelist(struct nfs_read_data *data) |
| 322 | { |
| 323 | struct pnfs_layout_segment *lseg = data->lseg; |
| 324 | struct nfs4_pnfs_ds *ds; |
| 325 | loff_t offset = data->args.offset; |
| 326 | u32 j, idx; |
| 327 | struct nfs_fh *fh; |
| 328 | int status; |
| 329 | |
| 330 | dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", |
| 331 | __func__, data->inode->i_ino, |
| 332 | data->args.pgbase, (size_t)data->args.count, offset); |
| 333 | |
| 334 | /* Retrieve the correct rpc_client for the byte range */ |
| 335 | j = nfs4_fl_calc_j_index(lseg, offset); |
| 336 | idx = nfs4_fl_calc_ds_index(lseg, j); |
| 337 | ds = nfs4_fl_prepare_ds(lseg, idx); |
| 338 | if (!ds) { |
Andy Adamson | 568e8c4 | 2011-03-01 01:34:22 +0000 | [diff] [blame] | 339 | /* Either layout fh index faulty, or ds connect failed */ |
| 340 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); |
| 341 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); |
Andy Adamson | dc70d7b | 2011-03-01 01:34:19 +0000 | [diff] [blame] | 342 | return PNFS_NOT_ATTEMPTED; |
| 343 | } |
| 344 | dprintk("%s USE DS:ip %x %hu\n", __func__, |
| 345 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port)); |
| 346 | |
| 347 | /* No multipath support. Use first DS */ |
| 348 | data->ds_clp = ds->ds_clp; |
| 349 | fh = nfs4_fl_select_ds_fh(lseg, j); |
| 350 | if (fh) |
| 351 | data->args.fh = fh; |
| 352 | |
| 353 | data->args.offset = filelayout_get_dserver_offset(lseg, offset); |
| 354 | data->mds_offset = offset; |
| 355 | |
| 356 | /* Perform an asynchronous read to ds */ |
| 357 | status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient, |
| 358 | &filelayout_read_call_ops); |
| 359 | BUG_ON(status != 0); |
| 360 | return PNFS_ATTEMPTED; |
| 361 | } |
| 362 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 363 | /* Perform async writes. */ |
Andy Adamson | 0382b74 | 2011-03-03 15:13:45 +0000 | [diff] [blame] | 364 | static enum pnfs_try_status |
| 365 | filelayout_write_pagelist(struct nfs_write_data *data, int sync) |
| 366 | { |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 367 | struct pnfs_layout_segment *lseg = data->lseg; |
| 368 | struct nfs4_pnfs_ds *ds; |
| 369 | loff_t offset = data->args.offset; |
| 370 | u32 j, idx; |
| 371 | struct nfs_fh *fh; |
| 372 | int status; |
| 373 | |
| 374 | /* Retrieve the correct rpc_client for the byte range */ |
| 375 | j = nfs4_fl_calc_j_index(lseg, offset); |
| 376 | idx = nfs4_fl_calc_ds_index(lseg, j); |
| 377 | ds = nfs4_fl_prepare_ds(lseg, idx); |
| 378 | if (!ds) { |
| 379 | printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); |
| 380 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); |
| 381 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); |
| 382 | return PNFS_NOT_ATTEMPTED; |
| 383 | } |
| 384 | dprintk("%s ino %lu sync %d req %Zu@%llu DS:%x:%hu\n", __func__, |
| 385 | data->inode->i_ino, sync, (size_t) data->args.count, offset, |
| 386 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port)); |
| 387 | |
| 388 | /* We can't handle commit to ds yet */ |
| 389 | if (!FILELAYOUT_LSEG(lseg)->commit_through_mds) |
| 390 | data->args.stable = NFS_FILE_SYNC; |
| 391 | |
| 392 | data->write_done_cb = filelayout_write_done_cb; |
| 393 | data->ds_clp = ds->ds_clp; |
| 394 | fh = nfs4_fl_select_ds_fh(lseg, j); |
| 395 | if (fh) |
| 396 | data->args.fh = fh; |
| 397 | /* |
| 398 | * Get the file offset on the dserver. Set the write offset to |
| 399 | * this offset and save the original offset. |
| 400 | */ |
| 401 | data->args.offset = filelayout_get_dserver_offset(lseg, offset); |
| 402 | data->mds_offset = offset; |
| 403 | |
| 404 | /* Perform an asynchronous write */ |
| 405 | status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient, |
| 406 | &filelayout_write_call_ops, sync); |
| 407 | BUG_ON(status != 0); |
| 408 | return PNFS_ATTEMPTED; |
Andy Adamson | 0382b74 | 2011-03-03 15:13:45 +0000 | [diff] [blame] | 409 | } |
| 410 | |
Andy Adamson | dc70d7b | 2011-03-01 01:34:19 +0000 | [diff] [blame] | 411 | /* |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 412 | * filelayout_check_layout() |
| 413 | * |
| 414 | * Make sure layout segment parameters are sane WRT the device. |
| 415 | * At this point no generic layer initialization of the lseg has occurred, |
| 416 | * and nothing has been added to the layout_hdr cache. |
| 417 | * |
| 418 | */ |
| 419 | static int |
| 420 | filelayout_check_layout(struct pnfs_layout_hdr *lo, |
| 421 | struct nfs4_filelayout_segment *fl, |
| 422 | struct nfs4_layoutget_res *lgr, |
| 423 | struct nfs4_deviceid *id) |
| 424 | { |
| 425 | struct nfs4_file_layout_dsaddr *dsaddr; |
| 426 | int status = -EINVAL; |
Fred Isaman | b7edfaa | 2011-01-06 11:36:21 +0000 | [diff] [blame] | 427 | struct nfs_server *nfss = NFS_SERVER(lo->plh_inode); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 428 | |
| 429 | dprintk("--> %s\n", __func__); |
| 430 | |
| 431 | if (fl->pattern_offset > lgr->range.offset) { |
| 432 | dprintk("%s pattern_offset %lld to large\n", |
| 433 | __func__, fl->pattern_offset); |
| 434 | goto out; |
| 435 | } |
| 436 | |
Benny Halevy | 75247af | 2011-02-22 15:56:01 -0800 | [diff] [blame] | 437 | if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) { |
| 438 | dprintk("%s Invalid stripe unit (%u)\n", |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 439 | __func__, fl->stripe_unit); |
| 440 | goto out; |
| 441 | } |
| 442 | |
| 443 | /* find and reference the deviceid */ |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 444 | dsaddr = nfs4_fl_find_get_deviceid(id); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 445 | if (dsaddr == NULL) { |
Fred Isaman | b7edfaa | 2011-01-06 11:36:21 +0000 | [diff] [blame] | 446 | dsaddr = get_device_info(lo->plh_inode, id); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 447 | if (dsaddr == NULL) |
| 448 | goto out; |
| 449 | } |
| 450 | fl->dsaddr = dsaddr; |
| 451 | |
| 452 | if (fl->first_stripe_index < 0 || |
| 453 | fl->first_stripe_index >= dsaddr->stripe_count) { |
| 454 | dprintk("%s Bad first_stripe_index %d\n", |
| 455 | __func__, fl->first_stripe_index); |
| 456 | goto out_put; |
| 457 | } |
| 458 | |
| 459 | if ((fl->stripe_type == STRIPE_SPARSE && |
| 460 | fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || |
| 461 | (fl->stripe_type == STRIPE_DENSE && |
| 462 | fl->num_fh != dsaddr->stripe_count)) { |
| 463 | dprintk("%s num_fh %u not valid for given packing\n", |
| 464 | __func__, fl->num_fh); |
| 465 | goto out_put; |
| 466 | } |
| 467 | |
| 468 | if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) { |
| 469 | dprintk("%s Stripe unit (%u) not aligned with rsize %u " |
| 470 | "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize, |
| 471 | nfss->wsize); |
| 472 | } |
| 473 | |
| 474 | status = 0; |
| 475 | out: |
| 476 | dprintk("--> %s returns %d\n", __func__, status); |
| 477 | return status; |
| 478 | out_put: |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 479 | nfs4_fl_put_deviceid(dsaddr); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 480 | goto out; |
| 481 | } |
| 482 | |
| 483 | static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl) |
| 484 | { |
| 485 | int i; |
| 486 | |
| 487 | for (i = 0; i < fl->num_fh; i++) { |
| 488 | if (!fl->fh_array[i]) |
| 489 | break; |
| 490 | kfree(fl->fh_array[i]); |
| 491 | } |
| 492 | kfree(fl->fh_array); |
| 493 | fl->fh_array = NULL; |
| 494 | } |
| 495 | |
| 496 | static void |
| 497 | _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) |
| 498 | { |
| 499 | filelayout_free_fh_array(fl); |
| 500 | kfree(fl); |
| 501 | } |
| 502 | |
| 503 | static int |
| 504 | filelayout_decode_layout(struct pnfs_layout_hdr *flo, |
| 505 | struct nfs4_filelayout_segment *fl, |
| 506 | struct nfs4_layoutget_res *lgr, |
| 507 | struct nfs4_deviceid *id) |
| 508 | { |
| 509 | uint32_t *p = (uint32_t *)lgr->layout.buf; |
| 510 | uint32_t nfl_util; |
| 511 | int i; |
| 512 | |
| 513 | dprintk("%s: set_layout_map Begin\n", __func__); |
| 514 | |
| 515 | memcpy(id, p, sizeof(*id)); |
| 516 | p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); |
| 517 | print_deviceid(id); |
| 518 | |
| 519 | nfl_util = be32_to_cpup(p++); |
| 520 | if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) |
| 521 | fl->commit_through_mds = 1; |
| 522 | if (nfl_util & NFL4_UFLG_DENSE) |
| 523 | fl->stripe_type = STRIPE_DENSE; |
| 524 | else |
| 525 | fl->stripe_type = STRIPE_SPARSE; |
| 526 | fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; |
| 527 | |
| 528 | fl->first_stripe_index = be32_to_cpup(p++); |
| 529 | p = xdr_decode_hyper(p, &fl->pattern_offset); |
| 530 | fl->num_fh = be32_to_cpup(p++); |
| 531 | |
| 532 | dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", |
| 533 | __func__, nfl_util, fl->num_fh, fl->first_stripe_index, |
| 534 | fl->pattern_offset); |
| 535 | |
| 536 | fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *), |
| 537 | GFP_KERNEL); |
| 538 | if (!fl->fh_array) |
| 539 | return -ENOMEM; |
| 540 | |
| 541 | for (i = 0; i < fl->num_fh; i++) { |
| 542 | /* Do we want to use a mempool here? */ |
| 543 | fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL); |
| 544 | if (!fl->fh_array[i]) { |
| 545 | filelayout_free_fh_array(fl); |
| 546 | return -ENOMEM; |
| 547 | } |
| 548 | fl->fh_array[i]->size = be32_to_cpup(p++); |
| 549 | if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { |
| 550 | printk(KERN_ERR "Too big fh %d received %d\n", |
| 551 | i, fl->fh_array[i]->size); |
| 552 | filelayout_free_fh_array(fl); |
| 553 | return -EIO; |
| 554 | } |
| 555 | memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); |
| 556 | p += XDR_QUADLEN(fl->fh_array[i]->size); |
| 557 | dprintk("DEBUG: %s: fh len %d\n", __func__, |
| 558 | fl->fh_array[i]->size); |
| 559 | } |
| 560 | |
| 561 | return 0; |
| 562 | } |
| 563 | |
Fred Isaman | c879513 | 2011-03-23 13:27:49 +0000 | [diff] [blame] | 564 | static void |
| 565 | filelayout_free_lseg(struct pnfs_layout_segment *lseg) |
| 566 | { |
| 567 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); |
| 568 | |
| 569 | dprintk("--> %s\n", __func__); |
| 570 | nfs4_fl_put_deviceid(fl->dsaddr); |
Fred Isaman | 425eb73 | 2011-03-23 13:27:50 +0000 | [diff] [blame] | 571 | kfree(fl->commit_buckets); |
Fred Isaman | c879513 | 2011-03-23 13:27:49 +0000 | [diff] [blame] | 572 | _filelayout_free_lseg(fl); |
| 573 | } |
| 574 | |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 575 | static struct pnfs_layout_segment * |
| 576 | filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, |
| 577 | struct nfs4_layoutget_res *lgr) |
| 578 | { |
| 579 | struct nfs4_filelayout_segment *fl; |
| 580 | int rc; |
| 581 | struct nfs4_deviceid id; |
| 582 | |
| 583 | dprintk("--> %s\n", __func__); |
| 584 | fl = kzalloc(sizeof(*fl), GFP_KERNEL); |
| 585 | if (!fl) |
| 586 | return NULL; |
| 587 | |
| 588 | rc = filelayout_decode_layout(layoutid, fl, lgr, &id); |
| 589 | if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id)) { |
| 590 | _filelayout_free_lseg(fl); |
| 591 | return NULL; |
| 592 | } |
Fred Isaman | 425eb73 | 2011-03-23 13:27:50 +0000 | [diff] [blame] | 593 | |
| 594 | /* This assumes there is only one IOMODE_RW lseg. What |
| 595 | * we really want to do is have a layout_hdr level |
| 596 | * dictionary of <multipath_list4, fh> keys, each |
| 597 | * associated with a struct list_head, populated by calls |
| 598 | * to filelayout_write_pagelist(). |
| 599 | * */ |
| 600 | if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) { |
| 601 | int i; |
| 602 | int size = (fl->stripe_type == STRIPE_SPARSE) ? |
| 603 | fl->dsaddr->ds_num : fl->dsaddr->stripe_count; |
| 604 | |
| 605 | fl->commit_buckets = kcalloc(size, sizeof(struct list_head), GFP_KERNEL); |
| 606 | if (!fl->commit_buckets) { |
| 607 | filelayout_free_lseg(&fl->generic_hdr); |
| 608 | return NULL; |
| 609 | } |
| 610 | fl->number_of_buckets = size; |
| 611 | for (i = 0; i < size; i++) |
| 612 | INIT_LIST_HEAD(&fl->commit_buckets[i]); |
| 613 | } |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 614 | return &fl->generic_hdr; |
| 615 | } |
| 616 | |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 617 | /* |
| 618 | * filelayout_pg_test(). Called by nfs_can_coalesce_requests() |
| 619 | * |
| 620 | * return 1 : coalesce page |
| 621 | * return 0 : don't coalesce page |
| 622 | */ |
| 623 | int |
| 624 | filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| 625 | struct nfs_page *req) |
| 626 | { |
| 627 | u64 p_stripe, r_stripe; |
| 628 | u32 stripe_unit; |
| 629 | |
| 630 | if (!pgio->pg_lseg) |
| 631 | return 1; |
| 632 | p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT; |
| 633 | r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT; |
| 634 | stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; |
| 635 | |
| 636 | do_div(p_stripe, stripe_unit); |
| 637 | do_div(r_stripe, stripe_unit); |
| 638 | |
| 639 | return (p_stripe == r_stripe); |
| 640 | } |
| 641 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 642 | static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg) |
| 643 | { |
| 644 | return !FILELAYOUT_LSEG(lseg)->commit_through_mds; |
| 645 | } |
| 646 | |
| 647 | static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) |
| 648 | { |
| 649 | if (fl->stripe_type == STRIPE_SPARSE) |
| 650 | return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); |
| 651 | else |
| 652 | return j; |
| 653 | } |
| 654 | |
| 655 | struct list_head *filelayout_choose_commit_list(struct nfs_page *req) |
| 656 | { |
| 657 | struct pnfs_layout_segment *lseg = req->wb_commit_lseg; |
| 658 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); |
| 659 | u32 i, j; |
| 660 | struct list_head *list; |
| 661 | |
| 662 | /* Note that we are calling nfs4_fl_calc_j_index on each page |
| 663 | * that ends up being committed to a data server. An attractive |
| 664 | * alternative is to add a field to nfs_write_data and nfs_page |
| 665 | * to store the value calculated in filelayout_write_pagelist |
| 666 | * and just use that here. |
| 667 | */ |
| 668 | j = nfs4_fl_calc_j_index(lseg, |
| 669 | (loff_t)req->wb_index << PAGE_CACHE_SHIFT); |
| 670 | i = select_bucket_index(fl, j); |
| 671 | list = &fl->commit_buckets[i]; |
| 672 | if (list_empty(list)) { |
| 673 | /* Non-empty buckets hold a reference on the lseg */ |
| 674 | get_lseg(lseg); |
| 675 | } |
| 676 | return list; |
| 677 | } |
| 678 | |
| 679 | static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) |
| 680 | { |
| 681 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| 682 | |
| 683 | if (flseg->stripe_type == STRIPE_SPARSE) |
| 684 | return i; |
| 685 | else |
| 686 | return nfs4_fl_calc_ds_index(lseg, i); |
| 687 | } |
| 688 | |
| 689 | static struct nfs_fh * |
| 690 | select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) |
| 691 | { |
| 692 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| 693 | |
| 694 | if (flseg->stripe_type == STRIPE_SPARSE) { |
| 695 | if (flseg->num_fh == 1) |
| 696 | i = 0; |
| 697 | else if (flseg->num_fh == 0) |
| 698 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ |
| 699 | return NULL; |
| 700 | } |
| 701 | return flseg->fh_array[i]; |
| 702 | } |
| 703 | |
| 704 | static int filelayout_initiate_commit(struct nfs_write_data *data, int how) |
| 705 | { |
| 706 | struct pnfs_layout_segment *lseg = data->lseg; |
| 707 | struct nfs4_pnfs_ds *ds; |
| 708 | u32 idx; |
| 709 | struct nfs_fh *fh; |
| 710 | |
| 711 | idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); |
| 712 | ds = nfs4_fl_prepare_ds(lseg, idx); |
| 713 | if (!ds) { |
| 714 | printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); |
| 715 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); |
| 716 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); |
| 717 | prepare_to_resend_writes(data); |
| 718 | data->mds_ops->rpc_release(data); |
| 719 | return -EAGAIN; |
| 720 | } |
| 721 | dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how); |
| 722 | data->write_done_cb = filelayout_commit_done_cb; |
| 723 | data->ds_clp = ds->ds_clp; |
| 724 | fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); |
| 725 | if (fh) |
| 726 | data->args.fh = fh; |
| 727 | return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient, |
| 728 | &filelayout_commit_call_ops, how); |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * This is only useful while we are using whole file layouts. |
| 733 | */ |
| 734 | static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode) |
| 735 | { |
| 736 | struct pnfs_layout_segment *lseg, *rv = NULL; |
| 737 | |
| 738 | spin_lock(&inode->i_lock); |
| 739 | list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) |
| 740 | if (lseg->pls_range.iomode == IOMODE_RW) |
| 741 | rv = get_lseg(lseg); |
| 742 | spin_unlock(&inode->i_lock); |
| 743 | return rv; |
| 744 | } |
| 745 | |
| 746 | static int alloc_ds_commits(struct inode *inode, struct list_head *list) |
| 747 | { |
| 748 | struct pnfs_layout_segment *lseg; |
| 749 | struct nfs4_filelayout_segment *fl; |
| 750 | struct nfs_write_data *data; |
| 751 | int i, j; |
| 752 | |
| 753 | /* Won't need this when non-whole file layout segments are supported |
| 754 | * instead we will use a pnfs_layout_hdr structure */ |
| 755 | lseg = find_only_write_lseg(inode); |
| 756 | if (!lseg) |
| 757 | return 0; |
| 758 | fl = FILELAYOUT_LSEG(lseg); |
| 759 | for (i = 0; i < fl->number_of_buckets; i++) { |
| 760 | if (list_empty(&fl->commit_buckets[i])) |
| 761 | continue; |
| 762 | data = nfs_commitdata_alloc(); |
| 763 | if (!data) |
| 764 | goto out_bad; |
| 765 | data->ds_commit_index = i; |
| 766 | data->lseg = lseg; |
| 767 | list_add(&data->pages, list); |
| 768 | } |
| 769 | put_lseg(lseg); |
| 770 | return 0; |
| 771 | |
| 772 | out_bad: |
| 773 | for (j = i; j < fl->number_of_buckets; j++) { |
| 774 | if (list_empty(&fl->commit_buckets[i])) |
| 775 | continue; |
| 776 | nfs_retry_commit(&fl->commit_buckets[i], lseg); |
| 777 | put_lseg(lseg); /* associated with emptying bucket */ |
| 778 | } |
| 779 | put_lseg(lseg); |
| 780 | /* Caller will clean up entries put on list */ |
| 781 | return -ENOMEM; |
| 782 | } |
| 783 | |
| 784 | /* This follows nfs_commit_list pretty closely */ |
| 785 | static int |
| 786 | filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, |
| 787 | int how) |
| 788 | { |
| 789 | struct nfs_write_data *data, *tmp; |
| 790 | LIST_HEAD(list); |
| 791 | |
| 792 | if (!list_empty(mds_pages)) { |
| 793 | data = nfs_commitdata_alloc(); |
| 794 | if (!data) |
| 795 | goto out_bad; |
| 796 | data->lseg = NULL; |
| 797 | list_add(&data->pages, &list); |
| 798 | } |
| 799 | |
| 800 | if (alloc_ds_commits(inode, &list)) |
| 801 | goto out_bad; |
| 802 | |
| 803 | list_for_each_entry_safe(data, tmp, &list, pages) { |
| 804 | list_del_init(&data->pages); |
| 805 | atomic_inc(&NFS_I(inode)->commits_outstanding); |
| 806 | if (!data->lseg) { |
| 807 | nfs_init_commit(data, mds_pages, NULL); |
| 808 | nfs_initiate_commit(data, NFS_CLIENT(inode), |
| 809 | data->mds_ops, how); |
| 810 | } else { |
| 811 | nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg); |
| 812 | filelayout_initiate_commit(data, how); |
| 813 | } |
| 814 | } |
| 815 | return 0; |
| 816 | out_bad: |
| 817 | list_for_each_entry_safe(data, tmp, &list, pages) { |
| 818 | nfs_retry_commit(&data->pages, data->lseg); |
| 819 | list_del_init(&data->pages); |
| 820 | nfs_commit_free(data); |
| 821 | } |
| 822 | nfs_retry_commit(mds_pages, NULL); |
| 823 | nfs_commit_clear_lock(NFS_I(inode)); |
| 824 | return -ENOMEM; |
| 825 | } |
| 826 | |
Dean Hildebrand | 7ab672c | 2010-10-20 00:18:00 -0400 | [diff] [blame] | 827 | static struct pnfs_layoutdriver_type filelayout_type = { |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 828 | .id = LAYOUT_NFSV4_1_FILES, |
| 829 | .name = "LAYOUT_NFSV4_1_FILES", |
| 830 | .owner = THIS_MODULE, |
| 831 | .alloc_lseg = filelayout_alloc_lseg, |
| 832 | .free_lseg = filelayout_free_lseg, |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 833 | .pg_test = filelayout_pg_test, |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 834 | .mark_pnfs_commit = filelayout_mark_pnfs_commit, |
| 835 | .choose_commit_list = filelayout_choose_commit_list, |
| 836 | .commit_pagelist = filelayout_commit_pagelist, |
Andy Adamson | dc70d7b | 2011-03-01 01:34:19 +0000 | [diff] [blame] | 837 | .read_pagelist = filelayout_read_pagelist, |
Andy Adamson | 0382b74 | 2011-03-03 15:13:45 +0000 | [diff] [blame] | 838 | .write_pagelist = filelayout_write_pagelist, |
Dean Hildebrand | 7ab672c | 2010-10-20 00:18:00 -0400 | [diff] [blame] | 839 | }; |
| 840 | |
| 841 | static int __init nfs4filelayout_init(void) |
| 842 | { |
| 843 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", |
| 844 | __func__); |
| 845 | return pnfs_register_layoutdriver(&filelayout_type); |
| 846 | } |
| 847 | |
| 848 | static void __exit nfs4filelayout_exit(void) |
| 849 | { |
| 850 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", |
| 851 | __func__); |
| 852 | pnfs_unregister_layoutdriver(&filelayout_type); |
| 853 | } |
| 854 | |
| 855 | module_init(nfs4filelayout_init); |
| 856 | module_exit(nfs4filelayout_exit); |