1 | /* |
2 | * linux/fs/nfs/blocklayout/blocklayout.c |
3 | * |
4 | * Module for the NFSv4.1 pNFS block layout driver. |
5 | * |
6 | * Copyright (c) 2006 The Regents of the University of Michigan. |
7 | * All rights reserved. |
8 | * |
9 | * Andy Adamson <andros@citi.umich.edu> |
10 | * Fred Isaman <iisaman@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 from the |
22 | * university of michigan as to its fitness for any purpose, and without |
23 | * warranty by the university of michigan of any kind, either express |
24 | * or implied, including without limitation the implied warranties of |
25 | * merchantability and fitness for a particular purpose. the regents |
26 | * of the university of michigan shall not be liable for any damages, |
27 | * including special, indirect, incidental, or consequential damages, |
28 | * with respect to any claim arising out or in connection with the use |
29 | * of the software, even if it has been or is hereafter advised of the |
30 | * possibility of such damages. |
31 | */ |
32 | |
33 | #include <linux/module.h> |
34 | #include <linux/init.h> |
35 | #include <linux/mount.h> |
36 | #include <linux/namei.h> |
37 | #include <linux/bio.h> /* struct bio */ |
38 | #include <linux/prefetch.h> |
39 | #include <linux/pagevec.h> |
40 | |
41 | #include "../pnfs.h" |
42 | #include "../nfs4session.h" |
43 | #include "../internal.h" |
44 | #include "blocklayout.h" |
45 | |
46 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD |
47 | |
48 | MODULE_LICENSE("GPL" ); |
49 | MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>" ); |
50 | MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver" ); |
51 | |
52 | static bool is_hole(struct pnfs_block_extent *be) |
53 | { |
54 | switch (be->be_state) { |
55 | case PNFS_BLOCK_NONE_DATA: |
56 | return true; |
57 | case PNFS_BLOCK_INVALID_DATA: |
58 | return be->be_tag ? false : true; |
59 | default: |
60 | return false; |
61 | } |
62 | } |
63 | |
64 | /* The data we are handed might be spread across several bios. We need |
65 | * to track when the last one is finished. |
66 | */ |
67 | struct parallel_io { |
68 | struct kref refcnt; |
69 | void (*pnfs_callback) (void *data); |
70 | void *data; |
71 | }; |
72 | |
73 | static inline struct parallel_io *alloc_parallel(void *data) |
74 | { |
75 | struct parallel_io *rv; |
76 | |
77 | rv = kmalloc(size: sizeof(*rv), GFP_NOFS); |
78 | if (rv) { |
79 | rv->data = data; |
80 | kref_init(kref: &rv->refcnt); |
81 | } |
82 | return rv; |
83 | } |
84 | |
85 | static inline void get_parallel(struct parallel_io *p) |
86 | { |
87 | kref_get(kref: &p->refcnt); |
88 | } |
89 | |
90 | static void destroy_parallel(struct kref *kref) |
91 | { |
92 | struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); |
93 | |
94 | dprintk("%s enter\n" , __func__); |
95 | p->pnfs_callback(p->data); |
96 | kfree(objp: p); |
97 | } |
98 | |
99 | static inline void put_parallel(struct parallel_io *p) |
100 | { |
101 | kref_put(kref: &p->refcnt, release: destroy_parallel); |
102 | } |
103 | |
104 | static struct bio * |
105 | bl_submit_bio(struct bio *bio) |
106 | { |
107 | if (bio) { |
108 | get_parallel(p: bio->bi_private); |
109 | dprintk("%s submitting %s bio %u@%llu\n" , __func__, |
110 | bio_op(bio) == READ ? "read" : "write" , |
111 | bio->bi_iter.bi_size, |
112 | (unsigned long long)bio->bi_iter.bi_sector); |
113 | submit_bio(bio); |
114 | } |
115 | return NULL; |
116 | } |
117 | |
118 | static bool offset_in_map(u64 offset, struct pnfs_block_dev_map *map) |
119 | { |
120 | return offset >= map->start && offset < map->start + map->len; |
121 | } |
122 | |
123 | static struct bio * |
124 | do_add_page_to_bio(struct bio *bio, int npg, enum req_op op, sector_t isect, |
125 | struct page *page, struct pnfs_block_dev_map *map, |
126 | struct pnfs_block_extent *be, bio_end_io_t end_io, |
127 | struct parallel_io *par, unsigned int offset, int *len) |
128 | { |
129 | struct pnfs_block_dev *dev = |
130 | container_of(be->be_device, struct pnfs_block_dev, node); |
131 | u64 disk_addr, end; |
132 | |
133 | dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n" , __func__, |
134 | npg, (__force u32)op, (unsigned long long)isect, offset, *len); |
135 | |
136 | /* translate to device offset */ |
137 | isect += be->be_v_offset; |
138 | isect -= be->be_f_offset; |
139 | |
140 | /* translate to physical disk offset */ |
141 | disk_addr = (u64)isect << SECTOR_SHIFT; |
142 | if (!offset_in_map(offset: disk_addr, map)) { |
143 | if (!dev->map(dev, disk_addr, map) || !offset_in_map(offset: disk_addr, map)) |
144 | return ERR_PTR(error: -EIO); |
145 | bio = bl_submit_bio(bio); |
146 | } |
147 | disk_addr += map->disk_offset; |
148 | disk_addr -= map->start; |
149 | |
150 | /* limit length to what the device mapping allows */ |
151 | end = disk_addr + *len; |
152 | if (end >= map->start + map->len) |
153 | *len = map->start + map->len - disk_addr; |
154 | |
155 | retry: |
156 | if (!bio) { |
157 | bio = bio_alloc(bdev: map->bdev, nr_vecs: bio_max_segs(nr_segs: npg), opf: op, GFP_NOIO); |
158 | bio->bi_iter.bi_sector = disk_addr >> SECTOR_SHIFT; |
159 | bio->bi_end_io = end_io; |
160 | bio->bi_private = par; |
161 | } |
162 | if (bio_add_page(bio, page, len: *len, off: offset) < *len) { |
163 | bio = bl_submit_bio(bio); |
164 | goto retry; |
165 | } |
166 | return bio; |
167 | } |
168 | |
169 | static void bl_mark_devices_unavailable(struct nfs_pgio_header *, bool rw) |
170 | { |
171 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(lseg: header->lseg); |
172 | size_t bytes_left = header->args.count; |
173 | sector_t isect, extent_length = 0; |
174 | struct pnfs_block_extent be; |
175 | |
176 | isect = header->args.offset >> SECTOR_SHIFT; |
177 | bytes_left += header->args.offset - (isect << SECTOR_SHIFT); |
178 | |
179 | while (bytes_left > 0) { |
180 | if (!ext_tree_lookup(bl, isect, ret: &be, rw)) |
181 | return; |
182 | extent_length = be.be_length - (isect - be.be_f_offset); |
183 | nfs4_mark_deviceid_unavailable(node: be.be_device); |
184 | isect += extent_length; |
185 | if (bytes_left > extent_length << SECTOR_SHIFT) |
186 | bytes_left -= extent_length << SECTOR_SHIFT; |
187 | else |
188 | bytes_left = 0; |
189 | } |
190 | } |
191 | |
192 | static void bl_end_io_read(struct bio *bio) |
193 | { |
194 | struct parallel_io *par = bio->bi_private; |
195 | |
196 | if (bio->bi_status) { |
197 | struct nfs_pgio_header * = par->data; |
198 | |
199 | if (!header->pnfs_error) |
200 | header->pnfs_error = -EIO; |
201 | pnfs_set_lo_fail(lseg: header->lseg); |
202 | bl_mark_devices_unavailable(header, rw: false); |
203 | } |
204 | |
205 | bio_put(bio); |
206 | put_parallel(p: par); |
207 | } |
208 | |
209 | static void bl_read_cleanup(struct work_struct *work) |
210 | { |
211 | struct rpc_task *task; |
212 | struct nfs_pgio_header *hdr; |
213 | dprintk("%s enter\n" , __func__); |
214 | task = container_of(work, struct rpc_task, u.tk_work); |
215 | hdr = container_of(task, struct nfs_pgio_header, task); |
216 | pnfs_ld_read_done(hdr); |
217 | } |
218 | |
219 | static void |
220 | bl_end_par_io_read(void *data) |
221 | { |
222 | struct nfs_pgio_header *hdr = data; |
223 | |
224 | hdr->task.tk_status = hdr->pnfs_error; |
225 | INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup); |
226 | schedule_work(work: &hdr->task.u.tk_work); |
227 | } |
228 | |
229 | static enum pnfs_try_status |
230 | bl_read_pagelist(struct nfs_pgio_header *) |
231 | { |
232 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(lseg: header->lseg); |
233 | struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
234 | struct bio *bio = NULL; |
235 | struct pnfs_block_extent be; |
236 | sector_t isect, extent_length = 0; |
237 | struct parallel_io *par; |
238 | loff_t f_offset = header->args.offset; |
239 | size_t bytes_left = header->args.count; |
240 | unsigned int pg_offset = header->args.pgbase, pg_len; |
241 | struct page **pages = header->args.pages; |
242 | int pg_index = header->args.pgbase >> PAGE_SHIFT; |
243 | const bool is_dio = (header->dreq != NULL); |
244 | struct blk_plug plug; |
245 | int i; |
246 | |
247 | dprintk("%s enter nr_pages %u offset %lld count %u\n" , __func__, |
248 | header->page_array.npages, f_offset, |
249 | (unsigned int)header->args.count); |
250 | |
251 | par = alloc_parallel(data: header); |
252 | if (!par) |
253 | return PNFS_NOT_ATTEMPTED; |
254 | par->pnfs_callback = bl_end_par_io_read; |
255 | |
256 | blk_start_plug(&plug); |
257 | |
258 | isect = (sector_t) (f_offset >> SECTOR_SHIFT); |
259 | /* Code assumes extents are page-aligned */ |
260 | for (i = pg_index; i < header->page_array.npages; i++) { |
261 | if (extent_length <= 0) { |
262 | /* We've used up the previous extent */ |
263 | bio = bl_submit_bio(bio); |
264 | |
265 | /* Get the next one */ |
266 | if (!ext_tree_lookup(bl, isect, ret: &be, rw: false)) { |
267 | header->pnfs_error = -EIO; |
268 | goto out; |
269 | } |
270 | extent_length = be.be_length - (isect - be.be_f_offset); |
271 | } |
272 | |
273 | if (is_dio) { |
274 | if (pg_offset + bytes_left > PAGE_SIZE) |
275 | pg_len = PAGE_SIZE - pg_offset; |
276 | else |
277 | pg_len = bytes_left; |
278 | } else { |
279 | BUG_ON(pg_offset != 0); |
280 | pg_len = PAGE_SIZE; |
281 | } |
282 | |
283 | if (is_hole(be: &be)) { |
284 | bio = bl_submit_bio(bio); |
285 | /* Fill hole w/ zeroes w/o accessing device */ |
286 | dprintk("%s Zeroing page for hole\n" , __func__); |
287 | zero_user_segment(page: pages[i], start: pg_offset, end: pg_len); |
288 | |
289 | /* invalidate map */ |
290 | map.start = NFS4_MAX_UINT64; |
291 | } else { |
292 | bio = do_add_page_to_bio(bio, |
293 | npg: header->page_array.npages - i, |
294 | op: REQ_OP_READ, |
295 | isect, page: pages[i], map: &map, be: &be, |
296 | end_io: bl_end_io_read, par, |
297 | offset: pg_offset, len: &pg_len); |
298 | if (IS_ERR(ptr: bio)) { |
299 | header->pnfs_error = PTR_ERR(ptr: bio); |
300 | bio = NULL; |
301 | goto out; |
302 | } |
303 | } |
304 | isect += (pg_len >> SECTOR_SHIFT); |
305 | extent_length -= (pg_len >> SECTOR_SHIFT); |
306 | f_offset += pg_len; |
307 | bytes_left -= pg_len; |
308 | pg_offset = 0; |
309 | } |
310 | if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
311 | header->res.eof = 1; |
312 | header->res.count = header->inode->i_size - header->args.offset; |
313 | } else { |
314 | header->res.count = (isect << SECTOR_SHIFT) - header->args.offset; |
315 | } |
316 | out: |
317 | bl_submit_bio(bio); |
318 | blk_finish_plug(&plug); |
319 | put_parallel(p: par); |
320 | return PNFS_ATTEMPTED; |
321 | } |
322 | |
323 | static void bl_end_io_write(struct bio *bio) |
324 | { |
325 | struct parallel_io *par = bio->bi_private; |
326 | struct nfs_pgio_header * = par->data; |
327 | |
328 | if (bio->bi_status) { |
329 | if (!header->pnfs_error) |
330 | header->pnfs_error = -EIO; |
331 | pnfs_set_lo_fail(lseg: header->lseg); |
332 | bl_mark_devices_unavailable(header, rw: true); |
333 | } |
334 | bio_put(bio); |
335 | put_parallel(p: par); |
336 | } |
337 | |
338 | /* Function scheduled for call during bl_end_par_io_write, |
339 | * it marks sectors as written and extends the commitlist. |
340 | */ |
341 | static void bl_write_cleanup(struct work_struct *work) |
342 | { |
343 | struct rpc_task *task = container_of(work, struct rpc_task, u.tk_work); |
344 | struct nfs_pgio_header *hdr = |
345 | container_of(task, struct nfs_pgio_header, task); |
346 | |
347 | dprintk("%s enter\n" , __func__); |
348 | |
349 | if (likely(!hdr->pnfs_error)) { |
350 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(lseg: hdr->lseg); |
351 | u64 start = hdr->args.offset & (loff_t)PAGE_MASK; |
352 | u64 end = (hdr->args.offset + hdr->args.count + |
353 | PAGE_SIZE - 1) & (loff_t)PAGE_MASK; |
354 | u64 lwb = hdr->args.offset + hdr->args.count; |
355 | |
356 | ext_tree_mark_written(bl, start: start >> SECTOR_SHIFT, |
357 | len: (end - start) >> SECTOR_SHIFT, lwb); |
358 | } |
359 | |
360 | pnfs_ld_write_done(hdr); |
361 | } |
362 | |
363 | /* Called when last of bios associated with a bl_write_pagelist call finishes */ |
364 | static void bl_end_par_io_write(void *data) |
365 | { |
366 | struct nfs_pgio_header *hdr = data; |
367 | |
368 | hdr->task.tk_status = hdr->pnfs_error; |
369 | hdr->verf.committed = NFS_FILE_SYNC; |
370 | INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup); |
371 | schedule_work(work: &hdr->task.u.tk_work); |
372 | } |
373 | |
374 | static enum pnfs_try_status |
375 | bl_write_pagelist(struct nfs_pgio_header *, int sync) |
376 | { |
377 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(lseg: header->lseg); |
378 | struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
379 | struct bio *bio = NULL; |
380 | struct pnfs_block_extent be; |
381 | sector_t isect, extent_length = 0; |
382 | struct parallel_io *par = NULL; |
383 | loff_t offset = header->args.offset; |
384 | size_t count = header->args.count; |
385 | struct page **pages = header->args.pages; |
386 | int pg_index = header->args.pgbase >> PAGE_SHIFT; |
387 | unsigned int pg_len; |
388 | struct blk_plug plug; |
389 | int i; |
390 | |
391 | dprintk("%s enter, %zu@%lld\n" , __func__, count, offset); |
392 | |
393 | /* At this point, header->page_aray is a (sequential) list of nfs_pages. |
394 | * We want to write each, and if there is an error set pnfs_error |
395 | * to have it redone using nfs. |
396 | */ |
397 | par = alloc_parallel(data: header); |
398 | if (!par) |
399 | return PNFS_NOT_ATTEMPTED; |
400 | par->pnfs_callback = bl_end_par_io_write; |
401 | |
402 | blk_start_plug(&plug); |
403 | |
404 | /* we always write out the whole page */ |
405 | offset = offset & (loff_t)PAGE_MASK; |
406 | isect = offset >> SECTOR_SHIFT; |
407 | |
408 | for (i = pg_index; i < header->page_array.npages; i++) { |
409 | if (extent_length <= 0) { |
410 | /* We've used up the previous extent */ |
411 | bio = bl_submit_bio(bio); |
412 | /* Get the next one */ |
413 | if (!ext_tree_lookup(bl, isect, ret: &be, rw: true)) { |
414 | header->pnfs_error = -EINVAL; |
415 | goto out; |
416 | } |
417 | |
418 | extent_length = be.be_length - (isect - be.be_f_offset); |
419 | } |
420 | |
421 | pg_len = PAGE_SIZE; |
422 | bio = do_add_page_to_bio(bio, npg: header->page_array.npages - i, |
423 | op: REQ_OP_WRITE, isect, page: pages[i], map: &map, |
424 | be: &be, end_io: bl_end_io_write, par, offset: 0, len: &pg_len); |
425 | if (IS_ERR(ptr: bio)) { |
426 | header->pnfs_error = PTR_ERR(ptr: bio); |
427 | bio = NULL; |
428 | goto out; |
429 | } |
430 | |
431 | offset += pg_len; |
432 | count -= pg_len; |
433 | isect += (pg_len >> SECTOR_SHIFT); |
434 | extent_length -= (pg_len >> SECTOR_SHIFT); |
435 | } |
436 | |
437 | header->res.count = header->args.count; |
438 | out: |
439 | bl_submit_bio(bio); |
440 | blk_finish_plug(&plug); |
441 | put_parallel(p: par); |
442 | return PNFS_ATTEMPTED; |
443 | } |
444 | |
445 | static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) |
446 | { |
447 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
448 | int err; |
449 | |
450 | dprintk("%s enter\n" , __func__); |
451 | |
452 | err = ext_tree_remove(bl, rw: true, start: 0, LLONG_MAX); |
453 | WARN_ON(err); |
454 | |
455 | kfree_rcu(bl, bl_layout.plh_rcu); |
456 | } |
457 | |
458 | static struct pnfs_layout_hdr *__bl_alloc_layout_hdr(struct inode *inode, |
459 | gfp_t gfp_flags, bool is_scsi_layout) |
460 | { |
461 | struct pnfs_block_layout *bl; |
462 | |
463 | dprintk("%s enter\n" , __func__); |
464 | bl = kzalloc(size: sizeof(*bl), flags: gfp_flags); |
465 | if (!bl) |
466 | return NULL; |
467 | |
468 | bl->bl_ext_rw = RB_ROOT; |
469 | bl->bl_ext_ro = RB_ROOT; |
470 | spin_lock_init(&bl->bl_ext_lock); |
471 | |
472 | bl->bl_scsi_layout = is_scsi_layout; |
473 | return &bl->bl_layout; |
474 | } |
475 | |
476 | static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, |
477 | gfp_t gfp_flags) |
478 | { |
479 | return __bl_alloc_layout_hdr(inode, gfp_flags, is_scsi_layout: false); |
480 | } |
481 | |
482 | static struct pnfs_layout_hdr *sl_alloc_layout_hdr(struct inode *inode, |
483 | gfp_t gfp_flags) |
484 | { |
485 | return __bl_alloc_layout_hdr(inode, gfp_flags, is_scsi_layout: true); |
486 | } |
487 | |
488 | static void bl_free_lseg(struct pnfs_layout_segment *lseg) |
489 | { |
490 | dprintk("%s enter\n" , __func__); |
491 | kfree(objp: lseg); |
492 | } |
493 | |
494 | /* Tracks info needed to ensure extents in layout obey constraints of spec */ |
495 | struct layout_verification { |
496 | u32 mode; /* R or RW */ |
497 | u64 start; /* Expected start of next non-COW extent */ |
498 | u64 inval; /* Start of INVAL coverage */ |
499 | u64 cowread; /* End of COW read coverage */ |
500 | }; |
501 | |
502 | /* Verify the extent meets the layout requirements of the pnfs-block draft, |
503 | * section 2.3.1. |
504 | */ |
505 | static int verify_extent(struct pnfs_block_extent *be, |
506 | struct layout_verification *lv) |
507 | { |
508 | if (lv->mode == IOMODE_READ) { |
509 | if (be->be_state == PNFS_BLOCK_READWRITE_DATA || |
510 | be->be_state == PNFS_BLOCK_INVALID_DATA) |
511 | return -EIO; |
512 | if (be->be_f_offset != lv->start) |
513 | return -EIO; |
514 | lv->start += be->be_length; |
515 | return 0; |
516 | } |
517 | /* lv->mode == IOMODE_RW */ |
518 | if (be->be_state == PNFS_BLOCK_READWRITE_DATA) { |
519 | if (be->be_f_offset != lv->start) |
520 | return -EIO; |
521 | if (lv->cowread > lv->start) |
522 | return -EIO; |
523 | lv->start += be->be_length; |
524 | lv->inval = lv->start; |
525 | return 0; |
526 | } else if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
527 | if (be->be_f_offset != lv->start) |
528 | return -EIO; |
529 | lv->start += be->be_length; |
530 | return 0; |
531 | } else if (be->be_state == PNFS_BLOCK_READ_DATA) { |
532 | if (be->be_f_offset > lv->start) |
533 | return -EIO; |
534 | if (be->be_f_offset < lv->inval) |
535 | return -EIO; |
536 | if (be->be_f_offset < lv->cowread) |
537 | return -EIO; |
538 | /* It looks like you might want to min this with lv->start, |
539 | * but you really don't. |
540 | */ |
541 | lv->inval = lv->inval + be->be_length; |
542 | lv->cowread = be->be_f_offset + be->be_length; |
543 | return 0; |
544 | } else |
545 | return -EIO; |
546 | } |
547 | |
548 | static int decode_sector_number(__be32 **rp, sector_t *sp) |
549 | { |
550 | uint64_t s; |
551 | |
552 | *rp = xdr_decode_hyper(p: *rp, valp: &s); |
553 | if (s & 0x1ff) { |
554 | printk(KERN_WARNING "NFS: %s: sector not aligned\n" , __func__); |
555 | return -1; |
556 | } |
557 | *sp = s >> SECTOR_SHIFT; |
558 | return 0; |
559 | } |
560 | |
561 | static struct nfs4_deviceid_node * |
562 | bl_find_get_deviceid(struct nfs_server *server, |
563 | const struct nfs4_deviceid *id, const struct cred *cred, |
564 | gfp_t gfp_mask) |
565 | { |
566 | struct nfs4_deviceid_node *node; |
567 | unsigned long start, end; |
568 | |
569 | retry: |
570 | node = nfs4_find_get_deviceid(server, id, cred, gfp_mask); |
571 | if (!node) |
572 | return ERR_PTR(error: -ENODEV); |
573 | |
574 | if (test_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags) == 0) |
575 | return node; |
576 | |
577 | end = jiffies; |
578 | start = end - PNFS_DEVICE_RETRY_TIMEOUT; |
579 | if (!time_in_range(node->timestamp_unavailable, start, end)) { |
580 | nfs4_delete_deviceid(node->ld, node->nfs_client, id); |
581 | goto retry; |
582 | } |
583 | |
584 | nfs4_put_deviceid_node(node); |
585 | return ERR_PTR(error: -ENODEV); |
586 | } |
587 | |
588 | static int |
589 | bl_alloc_extent(struct xdr_stream *xdr, struct pnfs_layout_hdr *lo, |
590 | struct layout_verification *lv, struct list_head *extents, |
591 | gfp_t gfp_mask) |
592 | { |
593 | struct pnfs_block_extent *be; |
594 | struct nfs4_deviceid id; |
595 | int error; |
596 | __be32 *p; |
597 | |
598 | p = xdr_inline_decode(xdr, nbytes: 28 + NFS4_DEVICEID4_SIZE); |
599 | if (!p) |
600 | return -EIO; |
601 | |
602 | be = kzalloc(size: sizeof(*be), GFP_NOFS); |
603 | if (!be) |
604 | return -ENOMEM; |
605 | |
606 | memcpy(&id, p, NFS4_DEVICEID4_SIZE); |
607 | p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); |
608 | |
609 | be->be_device = bl_find_get_deviceid(server: NFS_SERVER(inode: lo->plh_inode), id: &id, |
610 | cred: lo->plh_lc_cred, gfp_mask); |
611 | if (IS_ERR(ptr: be->be_device)) { |
612 | error = PTR_ERR(ptr: be->be_device); |
613 | goto out_free_be; |
614 | } |
615 | |
616 | /* |
617 | * The next three values are read in as bytes, but stored in the |
618 | * extent structure in 512-byte granularity. |
619 | */ |
620 | error = -EIO; |
621 | if (decode_sector_number(rp: &p, sp: &be->be_f_offset) < 0) |
622 | goto out_put_deviceid; |
623 | if (decode_sector_number(rp: &p, sp: &be->be_length) < 0) |
624 | goto out_put_deviceid; |
625 | if (decode_sector_number(rp: &p, sp: &be->be_v_offset) < 0) |
626 | goto out_put_deviceid; |
627 | be->be_state = be32_to_cpup(p: p++); |
628 | |
629 | error = verify_extent(be, lv); |
630 | if (error) { |
631 | dprintk("%s: extent verification failed\n" , __func__); |
632 | goto out_put_deviceid; |
633 | } |
634 | |
635 | list_add_tail(new: &be->be_list, head: extents); |
636 | return 0; |
637 | |
638 | out_put_deviceid: |
639 | nfs4_put_deviceid_node(be->be_device); |
640 | out_free_be: |
641 | kfree(objp: be); |
642 | return error; |
643 | } |
644 | |
645 | static struct pnfs_layout_segment * |
646 | bl_alloc_lseg(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr, |
647 | gfp_t gfp_mask) |
648 | { |
649 | struct layout_verification lv = { |
650 | .mode = lgr->range.iomode, |
651 | .start = lgr->range.offset >> SECTOR_SHIFT, |
652 | .inval = lgr->range.offset >> SECTOR_SHIFT, |
653 | .cowread = lgr->range.offset >> SECTOR_SHIFT, |
654 | }; |
655 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
656 | struct pnfs_layout_segment *lseg; |
657 | struct xdr_buf buf; |
658 | struct xdr_stream xdr; |
659 | struct page *scratch; |
660 | int status, i; |
661 | uint32_t count; |
662 | __be32 *p; |
663 | LIST_HEAD(extents); |
664 | |
665 | dprintk("---> %s\n" , __func__); |
666 | |
667 | lseg = kzalloc(size: sizeof(*lseg), flags: gfp_mask); |
668 | if (!lseg) |
669 | return ERR_PTR(error: -ENOMEM); |
670 | |
671 | status = -ENOMEM; |
672 | scratch = alloc_page(gfp_mask); |
673 | if (!scratch) |
674 | goto out; |
675 | |
676 | xdr_init_decode_pages(xdr: &xdr, buf: &buf, |
677 | pages: lgr->layoutp->pages, len: lgr->layoutp->len); |
678 | xdr_set_scratch_page(xdr: &xdr, page: scratch); |
679 | |
680 | status = -EIO; |
681 | p = xdr_inline_decode(xdr: &xdr, nbytes: 4); |
682 | if (unlikely(!p)) |
683 | goto out_free_scratch; |
684 | |
685 | count = be32_to_cpup(p: p++); |
686 | dprintk("%s: number of extents %d\n" , __func__, count); |
687 | |
688 | /* |
689 | * Decode individual extents, putting them in temporary staging area |
690 | * until whole layout is decoded to make error recovery easier. |
691 | */ |
692 | for (i = 0; i < count; i++) { |
693 | status = bl_alloc_extent(xdr: &xdr, lo, lv: &lv, extents: &extents, gfp_mask); |
694 | if (status) |
695 | goto process_extents; |
696 | } |
697 | |
698 | if (lgr->range.offset + lgr->range.length != |
699 | lv.start << SECTOR_SHIFT) { |
700 | dprintk("%s Final length mismatch\n" , __func__); |
701 | status = -EIO; |
702 | goto process_extents; |
703 | } |
704 | |
705 | if (lv.start < lv.cowread) { |
706 | dprintk("%s Final uncovered COW extent\n" , __func__); |
707 | status = -EIO; |
708 | } |
709 | |
710 | process_extents: |
711 | while (!list_empty(head: &extents)) { |
712 | struct pnfs_block_extent *be = |
713 | list_first_entry(&extents, struct pnfs_block_extent, |
714 | be_list); |
715 | list_del(entry: &be->be_list); |
716 | |
717 | if (!status) |
718 | status = ext_tree_insert(bl, new: be); |
719 | |
720 | if (status) { |
721 | nfs4_put_deviceid_node(be->be_device); |
722 | kfree(objp: be); |
723 | } |
724 | } |
725 | |
726 | out_free_scratch: |
727 | __free_page(scratch); |
728 | out: |
729 | dprintk("%s returns %d\n" , __func__, status); |
730 | switch (status) { |
731 | case -ENODEV: |
732 | /* Our extent block devices are unavailable */ |
733 | set_bit(nr: NFS_LSEG_UNAVAILABLE, addr: &lseg->pls_flags); |
734 | fallthrough; |
735 | case 0: |
736 | return lseg; |
737 | default: |
738 | kfree(objp: lseg); |
739 | return ERR_PTR(error: status); |
740 | } |
741 | } |
742 | |
743 | static void |
744 | bl_return_range(struct pnfs_layout_hdr *lo, |
745 | struct pnfs_layout_range *range) |
746 | { |
747 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
748 | sector_t offset = range->offset >> SECTOR_SHIFT, end; |
749 | |
750 | if (range->offset % 8) { |
751 | dprintk("%s: offset %lld not block size aligned\n" , |
752 | __func__, range->offset); |
753 | return; |
754 | } |
755 | |
756 | if (range->length != NFS4_MAX_UINT64) { |
757 | if (range->length % 8) { |
758 | dprintk("%s: length %lld not block size aligned\n" , |
759 | __func__, range->length); |
760 | return; |
761 | } |
762 | |
763 | end = offset + (range->length >> SECTOR_SHIFT); |
764 | } else { |
765 | end = round_down(NFS4_MAX_UINT64, PAGE_SIZE); |
766 | } |
767 | |
768 | ext_tree_remove(bl, rw: range->iomode & IOMODE_RW, start: offset, end); |
769 | } |
770 | |
771 | static int |
772 | bl_prepare_layoutcommit(struct nfs4_layoutcommit_args *arg) |
773 | { |
774 | return ext_tree_prepare_commit(arg); |
775 | } |
776 | |
777 | static void |
778 | bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) |
779 | { |
780 | ext_tree_mark_committed(arg: &lcdata->args, status: lcdata->res.status); |
781 | } |
782 | |
783 | static int |
784 | bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) |
785 | { |
786 | dprintk("%s enter\n" , __func__); |
787 | |
788 | if (server->pnfs_blksize == 0) { |
789 | dprintk("%s Server did not return blksize\n" , __func__); |
790 | return -EINVAL; |
791 | } |
792 | if (server->pnfs_blksize > PAGE_SIZE) { |
793 | printk(KERN_ERR "%s: pNFS blksize %d not supported.\n" , |
794 | __func__, server->pnfs_blksize); |
795 | return -EINVAL; |
796 | } |
797 | |
798 | return 0; |
799 | } |
800 | |
801 | static bool |
802 | is_aligned_req(struct nfs_pageio_descriptor *pgio, |
803 | struct nfs_page *req, unsigned int alignment, bool is_write) |
804 | { |
805 | /* |
806 | * Always accept buffered writes, higher layers take care of the |
807 | * right alignment. |
808 | */ |
809 | if (pgio->pg_dreq == NULL) |
810 | return true; |
811 | |
812 | if (!IS_ALIGNED(req->wb_offset, alignment)) |
813 | return false; |
814 | |
815 | if (IS_ALIGNED(req->wb_bytes, alignment)) |
816 | return true; |
817 | |
818 | if (is_write && |
819 | (req_offset(req) + req->wb_bytes == i_size_read(inode: pgio->pg_inode))) { |
820 | /* |
821 | * If the write goes up to the inode size, just write |
822 | * the full page. Data past the inode size is |
823 | * guaranteed to be zeroed by the higher level client |
824 | * code, and this behaviour is mandated by RFC 5663 |
825 | * section 2.3.2. |
826 | */ |
827 | return true; |
828 | } |
829 | |
830 | return false; |
831 | } |
832 | |
833 | static void |
834 | bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
835 | { |
836 | if (!is_aligned_req(pgio, req, SECTOR_SIZE, is_write: false)) { |
837 | nfs_pageio_reset_read_mds(pgio); |
838 | return; |
839 | } |
840 | |
841 | pnfs_generic_pg_init_read(pgio, req); |
842 | |
843 | if (pgio->pg_lseg && |
844 | test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) { |
845 | pnfs_error_mark_layout_for_return(inode: pgio->pg_inode, lseg: pgio->pg_lseg); |
846 | pnfs_set_lo_fail(lseg: pgio->pg_lseg); |
847 | nfs_pageio_reset_read_mds(pgio); |
848 | } |
849 | } |
850 | |
851 | /* |
852 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
853 | * of bytes (maximum @req->wb_bytes) that can be coalesced. |
854 | */ |
855 | static size_t |
856 | bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
857 | struct nfs_page *req) |
858 | { |
859 | if (!is_aligned_req(pgio, req, SECTOR_SIZE, is_write: false)) |
860 | return 0; |
861 | return pnfs_generic_pg_test(pgio, prev, req); |
862 | } |
863 | |
864 | /* |
865 | * Return the number of contiguous bytes for a given inode |
866 | * starting at page frame idx. |
867 | */ |
868 | static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) |
869 | { |
870 | struct address_space *mapping = inode->i_mapping; |
871 | pgoff_t end; |
872 | |
873 | /* Optimize common case that writes from 0 to end of file */ |
874 | end = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); |
875 | if (end != inode->i_mapping->nrpages) { |
876 | rcu_read_lock(); |
877 | end = page_cache_next_miss(mapping, index: idx + 1, ULONG_MAX); |
878 | rcu_read_unlock(); |
879 | } |
880 | |
881 | if (!end) |
882 | return i_size_read(inode) - (idx << PAGE_SHIFT); |
883 | else |
884 | return (end - idx) << PAGE_SHIFT; |
885 | } |
886 | |
887 | static void |
888 | bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
889 | { |
890 | u64 wb_size; |
891 | |
892 | if (!is_aligned_req(pgio, req, PAGE_SIZE, is_write: true)) { |
893 | nfs_pageio_reset_write_mds(pgio); |
894 | return; |
895 | } |
896 | |
897 | if (pgio->pg_dreq == NULL) |
898 | wb_size = pnfs_num_cont_bytes(inode: pgio->pg_inode, idx: req->wb_index); |
899 | else |
900 | wb_size = nfs_dreq_bytes_left(dreq: pgio->pg_dreq, offset: req_offset(req)); |
901 | |
902 | pnfs_generic_pg_init_write(pgio, req, wb_size); |
903 | |
904 | if (pgio->pg_lseg && |
905 | test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) { |
906 | |
907 | pnfs_error_mark_layout_for_return(inode: pgio->pg_inode, lseg: pgio->pg_lseg); |
908 | pnfs_set_lo_fail(lseg: pgio->pg_lseg); |
909 | nfs_pageio_reset_write_mds(pgio); |
910 | } |
911 | } |
912 | |
913 | /* |
914 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
915 | * of bytes (maximum @req->wb_bytes) that can be coalesced. |
916 | */ |
917 | static size_t |
918 | bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
919 | struct nfs_page *req) |
920 | { |
921 | if (!is_aligned_req(pgio, req, PAGE_SIZE, is_write: true)) |
922 | return 0; |
923 | return pnfs_generic_pg_test(pgio, prev, req); |
924 | } |
925 | |
926 | static const struct nfs_pageio_ops bl_pg_read_ops = { |
927 | .pg_init = bl_pg_init_read, |
928 | .pg_test = bl_pg_test_read, |
929 | .pg_doio = pnfs_generic_pg_readpages, |
930 | .pg_cleanup = pnfs_generic_pg_cleanup, |
931 | }; |
932 | |
933 | static const struct nfs_pageio_ops bl_pg_write_ops = { |
934 | .pg_init = bl_pg_init_write, |
935 | .pg_test = bl_pg_test_write, |
936 | .pg_doio = pnfs_generic_pg_writepages, |
937 | .pg_cleanup = pnfs_generic_pg_cleanup, |
938 | }; |
939 | |
940 | static struct pnfs_layoutdriver_type blocklayout_type = { |
941 | .id = LAYOUT_BLOCK_VOLUME, |
942 | .name = "LAYOUT_BLOCK_VOLUME" , |
943 | .owner = THIS_MODULE, |
944 | .flags = PNFS_LAYOUTRET_ON_SETATTR | |
945 | PNFS_LAYOUTRET_ON_ERROR | |
946 | PNFS_READ_WHOLE_PAGE, |
947 | .read_pagelist = bl_read_pagelist, |
948 | .write_pagelist = bl_write_pagelist, |
949 | .alloc_layout_hdr = bl_alloc_layout_hdr, |
950 | .free_layout_hdr = bl_free_layout_hdr, |
951 | .alloc_lseg = bl_alloc_lseg, |
952 | .free_lseg = bl_free_lseg, |
953 | .return_range = bl_return_range, |
954 | .prepare_layoutcommit = bl_prepare_layoutcommit, |
955 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, |
956 | .set_layoutdriver = bl_set_layoutdriver, |
957 | .alloc_deviceid_node = bl_alloc_deviceid_node, |
958 | .free_deviceid_node = bl_free_deviceid_node, |
959 | .pg_read_ops = &bl_pg_read_ops, |
960 | .pg_write_ops = &bl_pg_write_ops, |
961 | .sync = pnfs_generic_sync, |
962 | }; |
963 | |
964 | static struct pnfs_layoutdriver_type scsilayout_type = { |
965 | .id = LAYOUT_SCSI, |
966 | .name = "LAYOUT_SCSI" , |
967 | .owner = THIS_MODULE, |
968 | .flags = PNFS_LAYOUTRET_ON_SETATTR | |
969 | PNFS_LAYOUTRET_ON_ERROR | |
970 | PNFS_READ_WHOLE_PAGE, |
971 | .read_pagelist = bl_read_pagelist, |
972 | .write_pagelist = bl_write_pagelist, |
973 | .alloc_layout_hdr = sl_alloc_layout_hdr, |
974 | .free_layout_hdr = bl_free_layout_hdr, |
975 | .alloc_lseg = bl_alloc_lseg, |
976 | .free_lseg = bl_free_lseg, |
977 | .return_range = bl_return_range, |
978 | .prepare_layoutcommit = bl_prepare_layoutcommit, |
979 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, |
980 | .set_layoutdriver = bl_set_layoutdriver, |
981 | .alloc_deviceid_node = bl_alloc_deviceid_node, |
982 | .free_deviceid_node = bl_free_deviceid_node, |
983 | .pg_read_ops = &bl_pg_read_ops, |
984 | .pg_write_ops = &bl_pg_write_ops, |
985 | .sync = pnfs_generic_sync, |
986 | }; |
987 | |
988 | |
989 | static int __init nfs4blocklayout_init(void) |
990 | { |
991 | int ret; |
992 | |
993 | dprintk("%s: NFSv4 Block Layout Driver Registering...\n" , __func__); |
994 | |
995 | ret = bl_init_pipefs(); |
996 | if (ret) |
997 | goto out; |
998 | |
999 | ret = pnfs_register_layoutdriver(&blocklayout_type); |
1000 | if (ret) |
1001 | goto out_cleanup_pipe; |
1002 | |
1003 | ret = pnfs_register_layoutdriver(&scsilayout_type); |
1004 | if (ret) |
1005 | goto out_unregister_block; |
1006 | return 0; |
1007 | |
1008 | out_unregister_block: |
1009 | pnfs_unregister_layoutdriver(&blocklayout_type); |
1010 | out_cleanup_pipe: |
1011 | bl_cleanup_pipefs(); |
1012 | out: |
1013 | return ret; |
1014 | } |
1015 | |
1016 | static void __exit nfs4blocklayout_exit(void) |
1017 | { |
1018 | dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n" , |
1019 | __func__); |
1020 | |
1021 | pnfs_unregister_layoutdriver(&scsilayout_type); |
1022 | pnfs_unregister_layoutdriver(&blocklayout_type); |
1023 | bl_cleanup_pipefs(); |
1024 | } |
1025 | |
1026 | MODULE_ALIAS("nfs-layouttype4-3" ); |
1027 | MODULE_ALIAS("nfs-layouttype4-5" ); |
1028 | |
1029 | module_init(nfs4blocklayout_init); |
1030 | module_exit(nfs4blocklayout_exit); |
1031 | |