Commit | Line | Data |
---|---|---|
155e7524 FI |
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 | */ | |
9549ec01 | 32 | |
155e7524 FI |
33 | #include <linux/module.h> |
34 | #include <linux/init.h> | |
fe0a9b74 JR |
35 | #include <linux/mount.h> |
36 | #include <linux/namei.h> | |
9549ec01 | 37 | #include <linux/bio.h> /* struct bio */ |
71cdd40f | 38 | #include <linux/buffer_head.h> /* various write calls */ |
88c9e421 | 39 | #include <linux/prefetch.h> |
6296556f | 40 | #include <linux/pagevec.h> |
155e7524 | 41 | |
10bd295a | 42 | #include "../pnfs.h" |
76e697ba | 43 | #include "../nfs4session.h" |
10bd295a | 44 | #include "../internal.h" |
155e7524 FI |
45 | #include "blocklayout.h" |
46 | ||
47 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
48 | ||
49 | MODULE_LICENSE("GPL"); | |
50 | MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>"); | |
51 | MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); | |
52 | ||
9549ec01 FI |
53 | static void print_page(struct page *page) |
54 | { | |
55 | dprintk("PRINTPAGE page %p\n", page); | |
56 | dprintk(" PagePrivate %d\n", PagePrivate(page)); | |
57 | dprintk(" PageUptodate %d\n", PageUptodate(page)); | |
58 | dprintk(" PageError %d\n", PageError(page)); | |
59 | dprintk(" PageDirty %d\n", PageDirty(page)); | |
60 | dprintk(" PageReferenced %d\n", PageReferenced(page)); | |
61 | dprintk(" PageLocked %d\n", PageLocked(page)); | |
62 | dprintk(" PageWriteback %d\n", PageWriteback(page)); | |
63 | dprintk(" PageMappedToDisk %d\n", PageMappedToDisk(page)); | |
64 | dprintk("\n"); | |
65 | } | |
66 | ||
67 | /* Given the be associated with isect, determine if page data needs to be | |
68 | * initialized. | |
69 | */ | |
70 | static int is_hole(struct pnfs_block_extent *be, sector_t isect) | |
71 | { | |
72 | if (be->be_state == PNFS_BLOCK_NONE_DATA) | |
73 | return 1; | |
74 | else if (be->be_state != PNFS_BLOCK_INVALID_DATA) | |
75 | return 0; | |
76 | else | |
77 | return !bl_is_sector_init(be->be_inval, isect); | |
78 | } | |
79 | ||
650e2d39 FI |
80 | /* Given the be associated with isect, determine if page data can be |
81 | * written to disk. | |
82 | */ | |
83 | static int is_writable(struct pnfs_block_extent *be, sector_t isect) | |
84 | { | |
71cdd40f PT |
85 | return (be->be_state == PNFS_BLOCK_READWRITE_DATA || |
86 | be->be_state == PNFS_BLOCK_INVALID_DATA); | |
650e2d39 FI |
87 | } |
88 | ||
9549ec01 FI |
89 | /* The data we are handed might be spread across several bios. We need |
90 | * to track when the last one is finished. | |
91 | */ | |
92 | struct parallel_io { | |
93 | struct kref refcnt; | |
7c5465d6 | 94 | void (*pnfs_callback) (void *data, int num_se); |
9549ec01 | 95 | void *data; |
7c5465d6 | 96 | int bse_count; |
9549ec01 FI |
97 | }; |
98 | ||
99 | static inline struct parallel_io *alloc_parallel(void *data) | |
100 | { | |
101 | struct parallel_io *rv; | |
102 | ||
103 | rv = kmalloc(sizeof(*rv), GFP_NOFS); | |
104 | if (rv) { | |
105 | rv->data = data; | |
106 | kref_init(&rv->refcnt); | |
7c5465d6 | 107 | rv->bse_count = 0; |
9549ec01 FI |
108 | } |
109 | return rv; | |
110 | } | |
111 | ||
112 | static inline void get_parallel(struct parallel_io *p) | |
113 | { | |
114 | kref_get(&p->refcnt); | |
115 | } | |
116 | ||
117 | static void destroy_parallel(struct kref *kref) | |
118 | { | |
119 | struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); | |
120 | ||
121 | dprintk("%s enter\n", __func__); | |
7c5465d6 | 122 | p->pnfs_callback(p->data, p->bse_count); |
9549ec01 FI |
123 | kfree(p); |
124 | } | |
125 | ||
126 | static inline void put_parallel(struct parallel_io *p) | |
127 | { | |
128 | kref_put(&p->refcnt, destroy_parallel); | |
129 | } | |
130 | ||
131 | static struct bio * | |
132 | bl_submit_bio(int rw, struct bio *bio) | |
133 | { | |
134 | if (bio) { | |
135 | get_parallel(bio->bi_private); | |
136 | dprintk("%s submitting %s bio %u@%llu\n", __func__, | |
4f024f37 KO |
137 | rw == READ ? "read" : "write", bio->bi_iter.bi_size, |
138 | (unsigned long long)bio->bi_iter.bi_sector); | |
9549ec01 FI |
139 | submit_bio(rw, bio); |
140 | } | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | static struct bio *bl_alloc_init_bio(int npg, sector_t isect, | |
145 | struct pnfs_block_extent *be, | |
146 | void (*end_io)(struct bio *, int err), | |
147 | struct parallel_io *par) | |
148 | { | |
149 | struct bio *bio; | |
150 | ||
74a6eeb4 | 151 | npg = min(npg, BIO_MAX_PAGES); |
9549ec01 | 152 | bio = bio_alloc(GFP_NOIO, npg); |
74a6eeb4 PT |
153 | if (!bio && (current->flags & PF_MEMALLOC)) { |
154 | while (!bio && (npg /= 2)) | |
155 | bio = bio_alloc(GFP_NOIO, npg); | |
156 | } | |
9549ec01 | 157 | |
74a6eeb4 | 158 | if (bio) { |
4f024f37 KO |
159 | bio->bi_iter.bi_sector = isect - be->be_f_offset + |
160 | be->be_v_offset; | |
74a6eeb4 PT |
161 | bio->bi_bdev = be->be_mdev; |
162 | bio->bi_end_io = end_io; | |
163 | bio->bi_private = par; | |
164 | } | |
9549ec01 FI |
165 | return bio; |
166 | } | |
167 | ||
fe6e1e8d | 168 | static struct bio *do_add_page_to_bio(struct bio *bio, int npg, int rw, |
9549ec01 FI |
169 | sector_t isect, struct page *page, |
170 | struct pnfs_block_extent *be, | |
171 | void (*end_io)(struct bio *, int err), | |
fe6e1e8d PT |
172 | struct parallel_io *par, |
173 | unsigned int offset, int len) | |
9549ec01 | 174 | { |
fe6e1e8d PT |
175 | isect = isect + (offset >> SECTOR_SHIFT); |
176 | dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, | |
177 | npg, rw, (unsigned long long)isect, offset, len); | |
9549ec01 FI |
178 | retry: |
179 | if (!bio) { | |
180 | bio = bl_alloc_init_bio(npg, isect, be, end_io, par); | |
181 | if (!bio) | |
182 | return ERR_PTR(-ENOMEM); | |
183 | } | |
fe6e1e8d | 184 | if (bio_add_page(bio, page, len, offset) < len) { |
9549ec01 FI |
185 | bio = bl_submit_bio(rw, bio); |
186 | goto retry; | |
187 | } | |
188 | return bio; | |
189 | } | |
190 | ||
fe6e1e8d PT |
191 | static struct bio *bl_add_page_to_bio(struct bio *bio, int npg, int rw, |
192 | sector_t isect, struct page *page, | |
193 | struct pnfs_block_extent *be, | |
194 | void (*end_io)(struct bio *, int err), | |
195 | struct parallel_io *par) | |
196 | { | |
197 | return do_add_page_to_bio(bio, npg, rw, isect, page, be, | |
198 | end_io, par, 0, PAGE_CACHE_SIZE); | |
199 | } | |
200 | ||
9549ec01 FI |
201 | /* This is basically copied from mpage_end_io_read */ |
202 | static void bl_end_io_read(struct bio *bio, int err) | |
203 | { | |
204 | struct parallel_io *par = bio->bi_private; | |
2c30c71b KO |
205 | struct bio_vec *bvec; |
206 | int i; | |
9549ec01 | 207 | |
2c30c71b KO |
208 | if (!err) |
209 | bio_for_each_segment_all(bvec, bio, i) | |
210 | SetPageUptodate(bvec->bv_page); | |
9549ec01 | 211 | |
2c30c71b | 212 | if (err) { |
9c7e1b3d | 213 | struct nfs_pgio_data *rdata = par->data; |
cd841605 FI |
214 | struct nfs_pgio_header *header = rdata->header; |
215 | ||
216 | if (!header->pnfs_error) | |
217 | header->pnfs_error = -EIO; | |
218 | pnfs_set_lo_fail(header->lseg); | |
9549ec01 FI |
219 | } |
220 | bio_put(bio); | |
221 | put_parallel(par); | |
222 | } | |
223 | ||
224 | static void bl_read_cleanup(struct work_struct *work) | |
225 | { | |
226 | struct rpc_task *task; | |
9c7e1b3d | 227 | struct nfs_pgio_data *rdata; |
9549ec01 FI |
228 | dprintk("%s enter\n", __func__); |
229 | task = container_of(work, struct rpc_task, u.tk_work); | |
9c7e1b3d | 230 | rdata = container_of(task, struct nfs_pgio_data, task); |
9549ec01 FI |
231 | pnfs_ld_read_done(rdata); |
232 | } | |
233 | ||
234 | static void | |
7c5465d6 | 235 | bl_end_par_io_read(void *data, int unused) |
9549ec01 | 236 | { |
9c7e1b3d | 237 | struct nfs_pgio_data *rdata = data; |
9549ec01 | 238 | |
cd841605 | 239 | rdata->task.tk_status = rdata->header->pnfs_error; |
9549ec01 FI |
240 | INIT_WORK(&rdata->task.u.tk_work, bl_read_cleanup); |
241 | schedule_work(&rdata->task.u.tk_work); | |
242 | } | |
243 | ||
155e7524 | 244 | static enum pnfs_try_status |
9c7e1b3d | 245 | bl_read_pagelist(struct nfs_pgio_data *rdata) |
155e7524 | 246 | { |
cd841605 | 247 | struct nfs_pgio_header *header = rdata->header; |
9549ec01 FI |
248 | int i, hole; |
249 | struct bio *bio = NULL; | |
250 | struct pnfs_block_extent *be = NULL, *cow_read = NULL; | |
251 | sector_t isect, extent_length = 0; | |
252 | struct parallel_io *par; | |
253 | loff_t f_offset = rdata->args.offset; | |
f742dc4a PT |
254 | size_t bytes_left = rdata->args.count; |
255 | unsigned int pg_offset, pg_len; | |
9549ec01 FI |
256 | struct page **pages = rdata->args.pages; |
257 | int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT; | |
f742dc4a | 258 | const bool is_dio = (header->dreq != NULL); |
9549ec01 | 259 | |
6f00866d | 260 | dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, |
30dd374f | 261 | rdata->pages.npages, f_offset, (unsigned int)rdata->args.count); |
9549ec01 FI |
262 | |
263 | par = alloc_parallel(rdata); | |
264 | if (!par) | |
265 | goto use_mds; | |
9549ec01 FI |
266 | par->pnfs_callback = bl_end_par_io_read; |
267 | /* At this point, we can no longer jump to use_mds */ | |
268 | ||
269 | isect = (sector_t) (f_offset >> SECTOR_SHIFT); | |
270 | /* Code assumes extents are page-aligned */ | |
30dd374f | 271 | for (i = pg_index; i < rdata->pages.npages; i++) { |
9549ec01 FI |
272 | if (!extent_length) { |
273 | /* We've used up the previous extent */ | |
274 | bl_put_extent(be); | |
275 | bl_put_extent(cow_read); | |
276 | bio = bl_submit_bio(READ, bio); | |
277 | /* Get the next one */ | |
cd841605 | 278 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), |
9549ec01 FI |
279 | isect, &cow_read); |
280 | if (!be) { | |
cd841605 | 281 | header->pnfs_error = -EIO; |
9549ec01 FI |
282 | goto out; |
283 | } | |
284 | extent_length = be->be_length - | |
285 | (isect - be->be_f_offset); | |
286 | if (cow_read) { | |
287 | sector_t cow_length = cow_read->be_length - | |
288 | (isect - cow_read->be_f_offset); | |
289 | extent_length = min(extent_length, cow_length); | |
290 | } | |
291 | } | |
f742dc4a PT |
292 | |
293 | if (is_dio) { | |
294 | pg_offset = f_offset & ~PAGE_CACHE_MASK; | |
295 | if (pg_offset + bytes_left > PAGE_CACHE_SIZE) | |
296 | pg_len = PAGE_CACHE_SIZE - pg_offset; | |
297 | else | |
298 | pg_len = bytes_left; | |
299 | ||
300 | f_offset += pg_len; | |
301 | bytes_left -= pg_len; | |
302 | isect += (pg_offset >> SECTOR_SHIFT); | |
303 | } else { | |
304 | pg_offset = 0; | |
305 | pg_len = PAGE_CACHE_SIZE; | |
306 | } | |
307 | ||
9549ec01 FI |
308 | hole = is_hole(be, isect); |
309 | if (hole && !cow_read) { | |
310 | bio = bl_submit_bio(READ, bio); | |
311 | /* Fill hole w/ zeroes w/o accessing device */ | |
312 | dprintk("%s Zeroing page for hole\n", __func__); | |
f742dc4a | 313 | zero_user_segment(pages[i], pg_offset, pg_len); |
9549ec01 FI |
314 | print_page(pages[i]); |
315 | SetPageUptodate(pages[i]); | |
316 | } else { | |
317 | struct pnfs_block_extent *be_read; | |
318 | ||
319 | be_read = (hole && cow_read) ? cow_read : be; | |
f742dc4a | 320 | bio = do_add_page_to_bio(bio, rdata->pages.npages - i, |
30dd374f | 321 | READ, |
9549ec01 | 322 | isect, pages[i], be_read, |
f742dc4a PT |
323 | bl_end_io_read, par, |
324 | pg_offset, pg_len); | |
9549ec01 | 325 | if (IS_ERR(bio)) { |
cd841605 | 326 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 327 | bio = NULL; |
9549ec01 FI |
328 | goto out; |
329 | } | |
330 | } | |
f742dc4a | 331 | isect += (pg_len >> SECTOR_SHIFT); |
9549ec01 FI |
332 | extent_length -= PAGE_CACHE_SECTORS; |
333 | } | |
cd841605 | 334 | if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
9549ec01 | 335 | rdata->res.eof = 1; |
f742dc4a | 336 | rdata->res.count = header->inode->i_size - rdata->args.offset; |
9549ec01 | 337 | } else { |
f742dc4a | 338 | rdata->res.count = (isect << SECTOR_SHIFT) - rdata->args.offset; |
9549ec01 FI |
339 | } |
340 | out: | |
341 | bl_put_extent(be); | |
342 | bl_put_extent(cow_read); | |
343 | bl_submit_bio(READ, bio); | |
344 | put_parallel(par); | |
345 | return PNFS_ATTEMPTED; | |
346 | ||
347 | use_mds: | |
348 | dprintk("Giving up and using normal NFS\n"); | |
155e7524 FI |
349 | return PNFS_NOT_ATTEMPTED; |
350 | } | |
351 | ||
31e6306a FI |
352 | static void mark_extents_written(struct pnfs_block_layout *bl, |
353 | __u64 offset, __u32 count) | |
354 | { | |
355 | sector_t isect, end; | |
356 | struct pnfs_block_extent *be; | |
7c5465d6 | 357 | struct pnfs_block_short_extent *se; |
31e6306a FI |
358 | |
359 | dprintk("%s(%llu, %u)\n", __func__, offset, count); | |
360 | if (count == 0) | |
361 | return; | |
362 | isect = (offset & (long)(PAGE_CACHE_MASK)) >> SECTOR_SHIFT; | |
363 | end = (offset + count + PAGE_CACHE_SIZE - 1) & (long)(PAGE_CACHE_MASK); | |
364 | end >>= SECTOR_SHIFT; | |
365 | while (isect < end) { | |
366 | sector_t len; | |
367 | be = bl_find_get_extent(bl, isect, NULL); | |
368 | BUG_ON(!be); /* FIXME */ | |
369 | len = min(end, be->be_f_offset + be->be_length) - isect; | |
7c5465d6 PT |
370 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
371 | se = bl_pop_one_short_extent(be->be_inval); | |
372 | BUG_ON(!se); | |
373 | bl_mark_for_commit(be, isect, len, se); | |
374 | } | |
31e6306a FI |
375 | isect += len; |
376 | bl_put_extent(be); | |
377 | } | |
378 | } | |
379 | ||
71cdd40f PT |
380 | static void bl_end_io_write_zero(struct bio *bio, int err) |
381 | { | |
382 | struct parallel_io *par = bio->bi_private; | |
2c30c71b KO |
383 | struct bio_vec *bvec; |
384 | int i; | |
71cdd40f | 385 | |
2c30c71b | 386 | bio_for_each_segment_all(bvec, bio, i) { |
71cdd40f | 387 | /* This is the zeroing page we added */ |
2c30c71b KO |
388 | end_page_writeback(bvec->bv_page); |
389 | page_cache_release(bvec->bv_page); | |
390 | } | |
7c5465d6 | 391 | |
2c30c71b | 392 | if (unlikely(err)) { |
9c7e1b3d | 393 | struct nfs_pgio_data *data = par->data; |
cd841605 FI |
394 | struct nfs_pgio_header *header = data->header; |
395 | ||
396 | if (!header->pnfs_error) | |
397 | header->pnfs_error = -EIO; | |
398 | pnfs_set_lo_fail(header->lseg); | |
71cdd40f PT |
399 | } |
400 | bio_put(bio); | |
401 | put_parallel(par); | |
402 | } | |
403 | ||
650e2d39 FI |
404 | static void bl_end_io_write(struct bio *bio, int err) |
405 | { | |
406 | struct parallel_io *par = bio->bi_private; | |
407 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9c7e1b3d | 408 | struct nfs_pgio_data *data = par->data; |
cd841605 | 409 | struct nfs_pgio_header *header = data->header; |
650e2d39 FI |
410 | |
411 | if (!uptodate) { | |
cd841605 FI |
412 | if (!header->pnfs_error) |
413 | header->pnfs_error = -EIO; | |
414 | pnfs_set_lo_fail(header->lseg); | |
650e2d39 FI |
415 | } |
416 | bio_put(bio); | |
417 | put_parallel(par); | |
418 | } | |
419 | ||
420 | /* Function scheduled for call during bl_end_par_io_write, | |
421 | * it marks sectors as written and extends the commitlist. | |
422 | */ | |
423 | static void bl_write_cleanup(struct work_struct *work) | |
424 | { | |
425 | struct rpc_task *task; | |
9c7e1b3d | 426 | struct nfs_pgio_data *wdata; |
650e2d39 FI |
427 | dprintk("%s enter\n", __func__); |
428 | task = container_of(work, struct rpc_task, u.tk_work); | |
9c7e1b3d | 429 | wdata = container_of(task, struct nfs_pgio_data, task); |
cd841605 | 430 | if (likely(!wdata->header->pnfs_error)) { |
31e6306a | 431 | /* Marks for LAYOUTCOMMIT */ |
cd841605 | 432 | mark_extents_written(BLK_LSEG2EXT(wdata->header->lseg), |
31e6306a FI |
433 | wdata->args.offset, wdata->args.count); |
434 | } | |
650e2d39 FI |
435 | pnfs_ld_write_done(wdata); |
436 | } | |
437 | ||
438 | /* Called when last of bios associated with a bl_write_pagelist call finishes */ | |
7c5465d6 | 439 | static void bl_end_par_io_write(void *data, int num_se) |
650e2d39 | 440 | { |
9c7e1b3d | 441 | struct nfs_pgio_data *wdata = data; |
650e2d39 | 442 | |
cd841605 FI |
443 | if (unlikely(wdata->header->pnfs_error)) { |
444 | bl_free_short_extents(&BLK_LSEG2EXT(wdata->header->lseg)->bl_inval, | |
7c5465d6 PT |
445 | num_se); |
446 | } | |
447 | ||
cd841605 | 448 | wdata->task.tk_status = wdata->header->pnfs_error; |
650e2d39 FI |
449 | wdata->verf.committed = NFS_FILE_SYNC; |
450 | INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup); | |
451 | schedule_work(&wdata->task.u.tk_work); | |
452 | } | |
453 | ||
71cdd40f PT |
454 | /* FIXME STUB - mark intersection of layout and page as bad, so is not |
455 | * used again. | |
456 | */ | |
457 | static void mark_bad_read(void) | |
458 | { | |
459 | return; | |
460 | } | |
461 | ||
462 | /* | |
463 | * map_block: map a requested I/0 block (isect) into an offset in the LVM | |
464 | * block_device | |
465 | */ | |
466 | static void | |
467 | map_block(struct buffer_head *bh, sector_t isect, struct pnfs_block_extent *be) | |
468 | { | |
469 | dprintk("%s enter be=%p\n", __func__, be); | |
470 | ||
471 | set_buffer_mapped(bh); | |
472 | bh->b_bdev = be->be_mdev; | |
473 | bh->b_blocknr = (isect - be->be_f_offset + be->be_v_offset) >> | |
474 | (be->be_mdev->bd_inode->i_blkbits - SECTOR_SHIFT); | |
475 | ||
476 | dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n", | |
477 | __func__, (unsigned long long)isect, (long)bh->b_blocknr, | |
478 | bh->b_size); | |
479 | return; | |
480 | } | |
481 | ||
fe6e1e8d PT |
482 | static void |
483 | bl_read_single_end_io(struct bio *bio, int error) | |
484 | { | |
485 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
486 | struct page *page = bvec->bv_page; | |
487 | ||
488 | /* Only one page in bvec */ | |
489 | unlock_page(page); | |
490 | } | |
491 | ||
492 | static int | |
493 | bl_do_readpage_sync(struct page *page, struct pnfs_block_extent *be, | |
494 | unsigned int offset, unsigned int len) | |
495 | { | |
496 | struct bio *bio; | |
497 | struct page *shadow_page; | |
498 | sector_t isect; | |
499 | char *kaddr, *kshadow_addr; | |
500 | int ret = 0; | |
501 | ||
502 | dprintk("%s: offset %u len %u\n", __func__, offset, len); | |
503 | ||
504 | shadow_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
505 | if (shadow_page == NULL) | |
506 | return -ENOMEM; | |
507 | ||
508 | bio = bio_alloc(GFP_NOIO, 1); | |
509 | if (bio == NULL) | |
510 | return -ENOMEM; | |
511 | ||
512 | isect = (page->index << PAGE_CACHE_SECTOR_SHIFT) + | |
513 | (offset / SECTOR_SIZE); | |
514 | ||
4f024f37 | 515 | bio->bi_iter.bi_sector = isect - be->be_f_offset + be->be_v_offset; |
fe6e1e8d PT |
516 | bio->bi_bdev = be->be_mdev; |
517 | bio->bi_end_io = bl_read_single_end_io; | |
518 | ||
519 | lock_page(shadow_page); | |
520 | if (bio_add_page(bio, shadow_page, | |
521 | SECTOR_SIZE, round_down(offset, SECTOR_SIZE)) == 0) { | |
522 | unlock_page(shadow_page); | |
523 | bio_put(bio); | |
524 | return -EIO; | |
525 | } | |
526 | ||
527 | submit_bio(READ, bio); | |
528 | wait_on_page_locked(shadow_page); | |
529 | if (unlikely(!test_bit(BIO_UPTODATE, &bio->bi_flags))) { | |
530 | ret = -EIO; | |
531 | } else { | |
532 | kaddr = kmap_atomic(page); | |
533 | kshadow_addr = kmap_atomic(shadow_page); | |
534 | memcpy(kaddr + offset, kshadow_addr + offset, len); | |
535 | kunmap_atomic(kshadow_addr); | |
536 | kunmap_atomic(kaddr); | |
537 | } | |
538 | __free_page(shadow_page); | |
539 | bio_put(bio); | |
540 | ||
541 | return ret; | |
542 | } | |
543 | ||
544 | static int | |
545 | bl_read_partial_page_sync(struct page *page, struct pnfs_block_extent *be, | |
546 | unsigned int dirty_offset, unsigned int dirty_len, | |
547 | bool full_page) | |
548 | { | |
549 | int ret = 0; | |
550 | unsigned int start, end; | |
551 | ||
552 | if (full_page) { | |
553 | start = 0; | |
554 | end = PAGE_CACHE_SIZE; | |
555 | } else { | |
556 | start = round_down(dirty_offset, SECTOR_SIZE); | |
557 | end = round_up(dirty_offset + dirty_len, SECTOR_SIZE); | |
558 | } | |
559 | ||
560 | dprintk("%s: offset %u len %d\n", __func__, dirty_offset, dirty_len); | |
561 | if (!be) { | |
562 | zero_user_segments(page, start, dirty_offset, | |
563 | dirty_offset + dirty_len, end); | |
564 | if (start == 0 && end == PAGE_CACHE_SIZE && | |
565 | trylock_page(page)) { | |
566 | SetPageUptodate(page); | |
567 | unlock_page(page); | |
568 | } | |
569 | return ret; | |
570 | } | |
571 | ||
572 | if (start != dirty_offset) | |
573 | ret = bl_do_readpage_sync(page, be, start, dirty_offset - start); | |
574 | ||
575 | if (!ret && (dirty_offset + dirty_len < end)) | |
576 | ret = bl_do_readpage_sync(page, be, dirty_offset + dirty_len, | |
577 | end - dirty_offset - dirty_len); | |
578 | ||
579 | return ret; | |
580 | } | |
581 | ||
71cdd40f PT |
582 | /* Given an unmapped page, zero it or read in page for COW, page is locked |
583 | * by caller. | |
584 | */ | |
585 | static int | |
586 | init_page_for_write(struct page *page, struct pnfs_block_extent *cow_read) | |
587 | { | |
588 | struct buffer_head *bh = NULL; | |
589 | int ret = 0; | |
590 | sector_t isect; | |
591 | ||
592 | dprintk("%s enter, %p\n", __func__, page); | |
593 | BUG_ON(PageUptodate(page)); | |
594 | if (!cow_read) { | |
595 | zero_user_segment(page, 0, PAGE_SIZE); | |
596 | SetPageUptodate(page); | |
597 | goto cleanup; | |
598 | } | |
599 | ||
600 | bh = alloc_page_buffers(page, PAGE_CACHE_SIZE, 0); | |
601 | if (!bh) { | |
602 | ret = -ENOMEM; | |
603 | goto cleanup; | |
604 | } | |
605 | ||
606 | isect = (sector_t) page->index << PAGE_CACHE_SECTOR_SHIFT; | |
607 | map_block(bh, isect, cow_read); | |
608 | if (!bh_uptodate_or_lock(bh)) | |
609 | ret = bh_submit_read(bh); | |
610 | if (ret) | |
611 | goto cleanup; | |
612 | SetPageUptodate(page); | |
613 | ||
614 | cleanup: | |
71cdd40f PT |
615 | if (bh) |
616 | free_buffer_head(bh); | |
617 | if (ret) { | |
618 | /* Need to mark layout with bad read...should now | |
619 | * just use nfs4 for reads and writes. | |
620 | */ | |
621 | mark_bad_read(); | |
622 | } | |
623 | return ret; | |
624 | } | |
625 | ||
72c50887 PT |
626 | /* Find or create a zeroing page marked being writeback. |
627 | * Return ERR_PTR on error, NULL to indicate skip this page and page itself | |
628 | * to indicate write out. | |
629 | */ | |
630 | static struct page * | |
631 | bl_find_get_zeroing_page(struct inode *inode, pgoff_t index, | |
632 | struct pnfs_block_extent *cow_read) | |
633 | { | |
634 | struct page *page; | |
635 | int locked = 0; | |
636 | page = find_get_page(inode->i_mapping, index); | |
637 | if (page) | |
638 | goto check_page; | |
639 | ||
640 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
641 | if (unlikely(!page)) { | |
642 | dprintk("%s oom\n", __func__); | |
643 | return ERR_PTR(-ENOMEM); | |
644 | } | |
645 | locked = 1; | |
646 | ||
647 | check_page: | |
648 | /* PageDirty: Other will write this out | |
649 | * PageWriteback: Other is writing this out | |
650 | * PageUptodate: It was read before | |
651 | */ | |
652 | if (PageDirty(page) || PageWriteback(page)) { | |
653 | print_page(page); | |
654 | if (locked) | |
655 | unlock_page(page); | |
656 | page_cache_release(page); | |
657 | return NULL; | |
658 | } | |
659 | ||
660 | if (!locked) { | |
661 | lock_page(page); | |
662 | locked = 1; | |
663 | goto check_page; | |
664 | } | |
665 | if (!PageUptodate(page)) { | |
666 | /* New page, readin or zero it */ | |
667 | init_page_for_write(page, cow_read); | |
668 | } | |
669 | set_page_writeback(page); | |
670 | unlock_page(page); | |
671 | ||
672 | return page; | |
673 | } | |
674 | ||
155e7524 | 675 | static enum pnfs_try_status |
9c7e1b3d | 676 | bl_write_pagelist(struct nfs_pgio_data *wdata, int sync) |
155e7524 | 677 | { |
cd841605 | 678 | struct nfs_pgio_header *header = wdata->header; |
71cdd40f | 679 | int i, ret, npg_zero, pg_index, last = 0; |
650e2d39 | 680 | struct bio *bio = NULL; |
71cdd40f PT |
681 | struct pnfs_block_extent *be = NULL, *cow_read = NULL; |
682 | sector_t isect, last_isect = 0, extent_length = 0; | |
96c9eae6 | 683 | struct parallel_io *par = NULL; |
650e2d39 FI |
684 | loff_t offset = wdata->args.offset; |
685 | size_t count = wdata->args.count; | |
fe6e1e8d | 686 | unsigned int pg_offset, pg_len, saved_len; |
650e2d39 | 687 | struct page **pages = wdata->args.pages; |
71cdd40f PT |
688 | struct page *page; |
689 | pgoff_t index; | |
690 | u64 temp; | |
691 | int npg_per_block = | |
cd841605 | 692 | NFS_SERVER(header->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT; |
650e2d39 FI |
693 | |
694 | dprintk("%s enter, %Zu@%lld\n", __func__, count, offset); | |
96c9eae6 PT |
695 | |
696 | if (header->dreq != NULL && | |
697 | (!IS_ALIGNED(offset, NFS_SERVER(header->inode)->pnfs_blksize) || | |
698 | !IS_ALIGNED(count, NFS_SERVER(header->inode)->pnfs_blksize))) { | |
699 | dprintk("pnfsblock nonblock aligned DIO writes. Resend MDS\n"); | |
700 | goto out_mds; | |
701 | } | |
650e2d39 | 702 | /* At this point, wdata->pages is a (sequential) list of nfs_pages. |
71cdd40f PT |
703 | * We want to write each, and if there is an error set pnfs_error |
704 | * to have it redone using nfs. | |
650e2d39 FI |
705 | */ |
706 | par = alloc_parallel(wdata); | |
707 | if (!par) | |
7c5465d6 | 708 | goto out_mds; |
650e2d39 FI |
709 | par->pnfs_callback = bl_end_par_io_write; |
710 | /* At this point, have to be more careful with error handling */ | |
711 | ||
712 | isect = (sector_t) ((offset & (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT); | |
cd841605 | 713 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), isect, &cow_read); |
71cdd40f PT |
714 | if (!be || !is_writable(be, isect)) { |
715 | dprintk("%s no matching extents!\n", __func__); | |
7c5465d6 | 716 | goto out_mds; |
71cdd40f PT |
717 | } |
718 | ||
719 | /* First page inside INVALID extent */ | |
720 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { | |
7c5465d6 PT |
721 | if (likely(!bl_push_one_short_extent(be->be_inval))) |
722 | par->bse_count++; | |
723 | else | |
724 | goto out_mds; | |
71cdd40f PT |
725 | temp = offset >> PAGE_CACHE_SHIFT; |
726 | npg_zero = do_div(temp, npg_per_block); | |
727 | isect = (sector_t) (((offset - npg_zero * PAGE_CACHE_SIZE) & | |
728 | (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT); | |
729 | extent_length = be->be_length - (isect - be->be_f_offset); | |
730 | ||
731 | fill_invalid_ext: | |
732 | dprintk("%s need to zero %d pages\n", __func__, npg_zero); | |
733 | for (;npg_zero > 0; npg_zero--) { | |
75422745 PT |
734 | if (bl_is_sector_init(be->be_inval, isect)) { |
735 | dprintk("isect %llu already init\n", | |
736 | (unsigned long long)isect); | |
737 | goto next_page; | |
738 | } | |
71cdd40f PT |
739 | /* page ref released in bl_end_io_write_zero */ |
740 | index = isect >> PAGE_CACHE_SECTOR_SHIFT; | |
741 | dprintk("%s zero %dth page: index %lu isect %llu\n", | |
742 | __func__, npg_zero, index, | |
743 | (unsigned long long)isect); | |
cd841605 | 744 | page = bl_find_get_zeroing_page(header->inode, index, |
72c50887 PT |
745 | cow_read); |
746 | if (unlikely(IS_ERR(page))) { | |
cd841605 | 747 | header->pnfs_error = PTR_ERR(page); |
71cdd40f | 748 | goto out; |
72c50887 | 749 | } else if (page == NULL) |
71cdd40f | 750 | goto next_page; |
71cdd40f PT |
751 | |
752 | ret = bl_mark_sectors_init(be->be_inval, isect, | |
60c52e3a | 753 | PAGE_CACHE_SECTORS); |
71cdd40f PT |
754 | if (unlikely(ret)) { |
755 | dprintk("%s bl_mark_sectors_init fail %d\n", | |
756 | __func__, ret); | |
757 | end_page_writeback(page); | |
758 | page_cache_release(page); | |
cd841605 | 759 | header->pnfs_error = ret; |
71cdd40f PT |
760 | goto out; |
761 | } | |
7c5465d6 PT |
762 | if (likely(!bl_push_one_short_extent(be->be_inval))) |
763 | par->bse_count++; | |
764 | else { | |
765 | end_page_writeback(page); | |
766 | page_cache_release(page); | |
cd841605 | 767 | header->pnfs_error = -ENOMEM; |
7c5465d6 PT |
768 | goto out; |
769 | } | |
770 | /* FIXME: This should be done in bi_end_io */ | |
cd841605 | 771 | mark_extents_written(BLK_LSEG2EXT(header->lseg), |
7c5465d6 PT |
772 | page->index << PAGE_CACHE_SHIFT, |
773 | PAGE_CACHE_SIZE); | |
774 | ||
71cdd40f PT |
775 | bio = bl_add_page_to_bio(bio, npg_zero, WRITE, |
776 | isect, page, be, | |
777 | bl_end_io_write_zero, par); | |
778 | if (IS_ERR(bio)) { | |
cd841605 | 779 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 780 | bio = NULL; |
71cdd40f PT |
781 | goto out; |
782 | } | |
71cdd40f PT |
783 | next_page: |
784 | isect += PAGE_CACHE_SECTORS; | |
785 | extent_length -= PAGE_CACHE_SECTORS; | |
786 | } | |
787 | if (last) | |
788 | goto write_done; | |
789 | } | |
790 | bio = bl_submit_bio(WRITE, bio); | |
791 | ||
792 | /* Middle pages */ | |
793 | pg_index = wdata->args.pgbase >> PAGE_CACHE_SHIFT; | |
30dd374f | 794 | for (i = pg_index; i < wdata->pages.npages; i++) { |
650e2d39 FI |
795 | if (!extent_length) { |
796 | /* We've used up the previous extent */ | |
797 | bl_put_extent(be); | |
fe6e1e8d | 798 | bl_put_extent(cow_read); |
650e2d39 FI |
799 | bio = bl_submit_bio(WRITE, bio); |
800 | /* Get the next one */ | |
cd841605 | 801 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), |
fe6e1e8d | 802 | isect, &cow_read); |
650e2d39 | 803 | if (!be || !is_writable(be, isect)) { |
cd841605 | 804 | header->pnfs_error = -EINVAL; |
650e2d39 FI |
805 | goto out; |
806 | } | |
7c5465d6 PT |
807 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
808 | if (likely(!bl_push_one_short_extent( | |
809 | be->be_inval))) | |
810 | par->bse_count++; | |
811 | else { | |
cd841605 | 812 | header->pnfs_error = -ENOMEM; |
7c5465d6 PT |
813 | goto out; |
814 | } | |
815 | } | |
650e2d39 | 816 | extent_length = be->be_length - |
71cdd40f | 817 | (isect - be->be_f_offset); |
650e2d39 | 818 | } |
fe6e1e8d PT |
819 | |
820 | dprintk("%s offset %lld count %Zu\n", __func__, offset, count); | |
821 | pg_offset = offset & ~PAGE_CACHE_MASK; | |
822 | if (pg_offset + count > PAGE_CACHE_SIZE) | |
823 | pg_len = PAGE_CACHE_SIZE - pg_offset; | |
824 | else | |
825 | pg_len = count; | |
826 | ||
827 | saved_len = pg_len; | |
828 | if (be->be_state == PNFS_BLOCK_INVALID_DATA && | |
829 | !bl_is_sector_init(be->be_inval, isect)) { | |
830 | ret = bl_read_partial_page_sync(pages[i], cow_read, | |
831 | pg_offset, pg_len, true); | |
832 | if (ret) { | |
833 | dprintk("%s bl_read_partial_page_sync fail %d\n", | |
834 | __func__, ret); | |
835 | header->pnfs_error = ret; | |
836 | goto out; | |
837 | } | |
838 | ||
71cdd40f | 839 | ret = bl_mark_sectors_init(be->be_inval, isect, |
60c52e3a | 840 | PAGE_CACHE_SECTORS); |
71cdd40f PT |
841 | if (unlikely(ret)) { |
842 | dprintk("%s bl_mark_sectors_init fail %d\n", | |
843 | __func__, ret); | |
cd841605 | 844 | header->pnfs_error = ret; |
71cdd40f | 845 | goto out; |
650e2d39 | 846 | } |
fe6e1e8d PT |
847 | |
848 | /* Expand to full page write */ | |
849 | pg_offset = 0; | |
850 | pg_len = PAGE_CACHE_SIZE; | |
851 | } else if ((pg_offset & (SECTOR_SIZE - 1)) || | |
852 | (pg_len & (SECTOR_SIZE - 1))){ | |
853 | /* ahh, nasty case. We have to do sync full sector | |
854 | * read-modify-write cycles. | |
855 | */ | |
856 | unsigned int saved_offset = pg_offset; | |
857 | ret = bl_read_partial_page_sync(pages[i], be, pg_offset, | |
858 | pg_len, false); | |
859 | pg_offset = round_down(pg_offset, SECTOR_SIZE); | |
860 | pg_len = round_up(saved_offset + pg_len, SECTOR_SIZE) | |
861 | - pg_offset; | |
71cdd40f | 862 | } |
fe6e1e8d PT |
863 | |
864 | ||
865 | bio = do_add_page_to_bio(bio, wdata->pages.npages - i, WRITE, | |
71cdd40f | 866 | isect, pages[i], be, |
fe6e1e8d PT |
867 | bl_end_io_write, par, |
868 | pg_offset, pg_len); | |
71cdd40f | 869 | if (IS_ERR(bio)) { |
cd841605 | 870 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 871 | bio = NULL; |
71cdd40f | 872 | goto out; |
650e2d39 | 873 | } |
fe6e1e8d PT |
874 | offset += saved_len; |
875 | count -= saved_len; | |
650e2d39 | 876 | isect += PAGE_CACHE_SECTORS; |
71cdd40f | 877 | last_isect = isect; |
650e2d39 FI |
878 | extent_length -= PAGE_CACHE_SECTORS; |
879 | } | |
71cdd40f PT |
880 | |
881 | /* Last page inside INVALID extent */ | |
882 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { | |
883 | bio = bl_submit_bio(WRITE, bio); | |
884 | temp = last_isect >> PAGE_CACHE_SECTOR_SHIFT; | |
885 | npg_zero = npg_per_block - do_div(temp, npg_per_block); | |
886 | if (npg_zero < npg_per_block) { | |
887 | last = 1; | |
888 | goto fill_invalid_ext; | |
889 | } | |
890 | } | |
891 | ||
892 | write_done: | |
fe6e1e8d | 893 | wdata->res.count = wdata->args.count; |
650e2d39 FI |
894 | out: |
895 | bl_put_extent(be); | |
fe6e1e8d | 896 | bl_put_extent(cow_read); |
650e2d39 FI |
897 | bl_submit_bio(WRITE, bio); |
898 | put_parallel(par); | |
899 | return PNFS_ATTEMPTED; | |
7c5465d6 PT |
900 | out_mds: |
901 | bl_put_extent(be); | |
fe6e1e8d | 902 | bl_put_extent(cow_read); |
7c5465d6 PT |
903 | kfree(par); |
904 | return PNFS_NOT_ATTEMPTED; | |
155e7524 FI |
905 | } |
906 | ||
9e692969 | 907 | /* FIXME - range ignored */ |
155e7524 | 908 | static void |
9e692969 | 909 | release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range) |
155e7524 | 910 | { |
9e692969 FI |
911 | int i; |
912 | struct pnfs_block_extent *be; | |
913 | ||
914 | spin_lock(&bl->bl_ext_lock); | |
915 | for (i = 0; i < EXTENT_LISTS; i++) { | |
916 | while (!list_empty(&bl->bl_extents[i])) { | |
917 | be = list_first_entry(&bl->bl_extents[i], | |
918 | struct pnfs_block_extent, | |
919 | be_node); | |
920 | list_del(&be->be_node); | |
921 | bl_put_extent(be); | |
922 | } | |
923 | } | |
924 | spin_unlock(&bl->bl_ext_lock); | |
155e7524 FI |
925 | } |
926 | ||
155e7524 FI |
927 | static void |
928 | release_inval_marks(struct pnfs_inval_markings *marks) | |
929 | { | |
c1c2a4cd | 930 | struct pnfs_inval_tracking *pos, *temp; |
7c5465d6 | 931 | struct pnfs_block_short_extent *se, *stemp; |
c1c2a4cd FI |
932 | |
933 | list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) { | |
934 | list_del(&pos->it_link); | |
935 | kfree(pos); | |
936 | } | |
7c5465d6 PT |
937 | |
938 | list_for_each_entry_safe(se, stemp, &marks->im_extents, bse_node) { | |
939 | list_del(&se->bse_node); | |
940 | kfree(se); | |
941 | } | |
155e7524 FI |
942 | return; |
943 | } | |
944 | ||
945 | static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
946 | { | |
947 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); | |
948 | ||
949 | dprintk("%s enter\n", __func__); | |
950 | release_extents(bl, NULL); | |
951 | release_inval_marks(&bl->bl_inval); | |
952 | kfree(bl); | |
953 | } | |
954 | ||
955 | static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, | |
956 | gfp_t gfp_flags) | |
957 | { | |
958 | struct pnfs_block_layout *bl; | |
959 | ||
960 | dprintk("%s enter\n", __func__); | |
961 | bl = kzalloc(sizeof(*bl), gfp_flags); | |
962 | if (!bl) | |
963 | return NULL; | |
964 | spin_lock_init(&bl->bl_ext_lock); | |
965 | INIT_LIST_HEAD(&bl->bl_extents[0]); | |
966 | INIT_LIST_HEAD(&bl->bl_extents[1]); | |
967 | INIT_LIST_HEAD(&bl->bl_commit); | |
968 | INIT_LIST_HEAD(&bl->bl_committing); | |
969 | bl->bl_count = 0; | |
970 | bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT; | |
971 | BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize); | |
972 | return &bl->bl_layout; | |
973 | } | |
974 | ||
a60d2ebd | 975 | static void bl_free_lseg(struct pnfs_layout_segment *lseg) |
155e7524 | 976 | { |
a60d2ebd FI |
977 | dprintk("%s enter\n", __func__); |
978 | kfree(lseg); | |
155e7524 FI |
979 | } |
980 | ||
a60d2ebd FI |
981 | /* We pretty much ignore lseg, and store all data layout wide, so we |
982 | * can correctly merge. | |
983 | */ | |
984 | static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo, | |
985 | struct nfs4_layoutget_res *lgr, | |
986 | gfp_t gfp_flags) | |
155e7524 | 987 | { |
a60d2ebd FI |
988 | struct pnfs_layout_segment *lseg; |
989 | int status; | |
990 | ||
991 | dprintk("%s enter\n", __func__); | |
992 | lseg = kzalloc(sizeof(*lseg), gfp_flags); | |
993 | if (!lseg) | |
994 | return ERR_PTR(-ENOMEM); | |
995 | status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags); | |
996 | if (status) { | |
997 | /* We don't want to call the full-blown bl_free_lseg, | |
998 | * since on error extents were not touched. | |
999 | */ | |
1000 | kfree(lseg); | |
1001 | return ERR_PTR(status); | |
1002 | } | |
1003 | return lseg; | |
155e7524 FI |
1004 | } |
1005 | ||
1006 | static void | |
1007 | bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr, | |
1008 | const struct nfs4_layoutcommit_args *arg) | |
1009 | { | |
90ace12a FI |
1010 | dprintk("%s enter\n", __func__); |
1011 | encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo), xdr, arg); | |
155e7524 FI |
1012 | } |
1013 | ||
1014 | static void | |
1015 | bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) | |
1016 | { | |
b2be7811 FI |
1017 | struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout; |
1018 | ||
1019 | dprintk("%s enter\n", __func__); | |
1020 | clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo), &lcdata->args, lcdata->res.status); | |
155e7524 FI |
1021 | } |
1022 | ||
2f9fd182 FI |
1023 | static void free_blk_mountid(struct block_mount_id *mid) |
1024 | { | |
1025 | if (mid) { | |
93a3844e PT |
1026 | struct pnfs_block_dev *dev, *tmp; |
1027 | ||
1028 | /* No need to take bm_lock as we are last user freeing bm_devlist */ | |
1029 | list_for_each_entry_safe(dev, tmp, &mid->bm_devlist, bm_node) { | |
2f9fd182 FI |
1030 | list_del(&dev->bm_node); |
1031 | bl_free_block_dev(dev); | |
1032 | } | |
2f9fd182 FI |
1033 | kfree(mid); |
1034 | } | |
1035 | } | |
1036 | ||
78e4e05c | 1037 | /* This is mostly copied from the filelayout_get_device_info function. |
2f9fd182 FI |
1038 | * It seems much of this should be at the generic pnfs level. |
1039 | */ | |
1040 | static struct pnfs_block_dev * | |
1041 | nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh, | |
1042 | struct nfs4_deviceid *d_id) | |
1043 | { | |
1044 | struct pnfs_device *dev; | |
516f2e24 | 1045 | struct pnfs_block_dev *rv; |
2f9fd182 FI |
1046 | u32 max_resp_sz; |
1047 | int max_pages; | |
1048 | struct page **pages = NULL; | |
1049 | int i, rc; | |
1050 | ||
1051 | /* | |
1052 | * Use the session max response size as the basis for setting | |
1053 | * GETDEVICEINFO's maxcount | |
1054 | */ | |
1055 | max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; | |
10bd295a | 1056 | max_pages = nfs_page_array_len(0, max_resp_sz); |
2f9fd182 FI |
1057 | dprintk("%s max_resp_sz %u max_pages %d\n", |
1058 | __func__, max_resp_sz, max_pages); | |
1059 | ||
1060 | dev = kmalloc(sizeof(*dev), GFP_NOFS); | |
1061 | if (!dev) { | |
1062 | dprintk("%s kmalloc failed\n", __func__); | |
516f2e24 | 1063 | return ERR_PTR(-ENOMEM); |
2f9fd182 FI |
1064 | } |
1065 | ||
1066 | pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS); | |
1067 | if (pages == NULL) { | |
1068 | kfree(dev); | |
516f2e24 | 1069 | return ERR_PTR(-ENOMEM); |
2f9fd182 FI |
1070 | } |
1071 | for (i = 0; i < max_pages; i++) { | |
1072 | pages[i] = alloc_page(GFP_NOFS); | |
516f2e24 JR |
1073 | if (!pages[i]) { |
1074 | rv = ERR_PTR(-ENOMEM); | |
2f9fd182 | 1075 | goto out_free; |
516f2e24 | 1076 | } |
2f9fd182 FI |
1077 | } |
1078 | ||
1079 | memcpy(&dev->dev_id, d_id, sizeof(*d_id)); | |
1080 | dev->layout_type = LAYOUT_BLOCK_VOLUME; | |
1081 | dev->pages = pages; | |
1082 | dev->pgbase = 0; | |
1083 | dev->pglen = PAGE_SIZE * max_pages; | |
1084 | dev->mincount = 0; | |
968fe252 | 1085 | dev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead; |
2f9fd182 FI |
1086 | |
1087 | dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data); | |
cd5875fe | 1088 | rc = nfs4_proc_getdeviceinfo(server, dev, NULL); |
2f9fd182 | 1089 | dprintk("%s getdevice info returns %d\n", __func__, rc); |
516f2e24 JR |
1090 | if (rc) { |
1091 | rv = ERR_PTR(rc); | |
2f9fd182 | 1092 | goto out_free; |
516f2e24 | 1093 | } |
2f9fd182 FI |
1094 | |
1095 | rv = nfs4_blk_decode_device(server, dev); | |
1096 | out_free: | |
1097 | for (i = 0; i < max_pages; i++) | |
1098 | __free_page(pages[i]); | |
1099 | kfree(pages); | |
1100 | kfree(dev); | |
1101 | return rv; | |
1102 | } | |
1103 | ||
155e7524 FI |
1104 | static int |
1105 | bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) | |
1106 | { | |
2f9fd182 FI |
1107 | struct block_mount_id *b_mt_id = NULL; |
1108 | struct pnfs_devicelist *dlist = NULL; | |
1109 | struct pnfs_block_dev *bdev; | |
1110 | LIST_HEAD(block_disklist); | |
516f2e24 | 1111 | int status, i; |
2f9fd182 | 1112 | |
155e7524 | 1113 | dprintk("%s enter\n", __func__); |
2f9fd182 FI |
1114 | |
1115 | if (server->pnfs_blksize == 0) { | |
1116 | dprintk("%s Server did not return blksize\n", __func__); | |
1117 | return -EINVAL; | |
1118 | } | |
1119 | b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS); | |
1120 | if (!b_mt_id) { | |
1121 | status = -ENOMEM; | |
1122 | goto out_error; | |
1123 | } | |
1124 | /* Initialize nfs4 block layout mount id */ | |
1125 | spin_lock_init(&b_mt_id->bm_lock); | |
1126 | INIT_LIST_HEAD(&b_mt_id->bm_devlist); | |
1127 | ||
1128 | dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS); | |
1129 | if (!dlist) { | |
1130 | status = -ENOMEM; | |
1131 | goto out_error; | |
1132 | } | |
1133 | dlist->eof = 0; | |
1134 | while (!dlist->eof) { | |
1135 | status = nfs4_proc_getdevicelist(server, fh, dlist); | |
1136 | if (status) | |
1137 | goto out_error; | |
1138 | dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n", | |
1139 | __func__, dlist->num_devs, dlist->eof); | |
1140 | for (i = 0; i < dlist->num_devs; i++) { | |
1141 | bdev = nfs4_blk_get_deviceinfo(server, fh, | |
1142 | &dlist->dev_id[i]); | |
516f2e24 JR |
1143 | if (IS_ERR(bdev)) { |
1144 | status = PTR_ERR(bdev); | |
2f9fd182 FI |
1145 | goto out_error; |
1146 | } | |
1147 | spin_lock(&b_mt_id->bm_lock); | |
1148 | list_add(&bdev->bm_node, &b_mt_id->bm_devlist); | |
1149 | spin_unlock(&b_mt_id->bm_lock); | |
1150 | } | |
1151 | } | |
1152 | dprintk("%s SUCCESS\n", __func__); | |
1153 | server->pnfs_ld_data = b_mt_id; | |
1154 | ||
1155 | out_return: | |
1156 | kfree(dlist); | |
1157 | return status; | |
1158 | ||
1159 | out_error: | |
1160 | free_blk_mountid(b_mt_id); | |
1161 | goto out_return; | |
155e7524 FI |
1162 | } |
1163 | ||
1164 | static int | |
1165 | bl_clear_layoutdriver(struct nfs_server *server) | |
1166 | { | |
2f9fd182 FI |
1167 | struct block_mount_id *b_mt_id = server->pnfs_ld_data; |
1168 | ||
155e7524 | 1169 | dprintk("%s enter\n", __func__); |
2f9fd182 FI |
1170 | free_blk_mountid(b_mt_id); |
1171 | dprintk("%s RETURNS\n", __func__); | |
155e7524 FI |
1172 | return 0; |
1173 | } | |
1174 | ||
f742dc4a PT |
1175 | static bool |
1176 | is_aligned_req(struct nfs_page *req, unsigned int alignment) | |
1177 | { | |
1178 | return IS_ALIGNED(req->wb_offset, alignment) && | |
1179 | IS_ALIGNED(req->wb_bytes, alignment); | |
1180 | } | |
1181 | ||
1182 | static void | |
1183 | bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) | |
1184 | { | |
1185 | if (pgio->pg_dreq != NULL && | |
1186 | !is_aligned_req(req, SECTOR_SIZE)) | |
1187 | nfs_pageio_reset_read_mds(pgio); | |
1188 | else | |
1189 | pnfs_generic_pg_init_read(pgio, req); | |
1190 | } | |
1191 | ||
1192 | static bool | |
1193 | bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, | |
1194 | struct nfs_page *req) | |
1195 | { | |
1196 | if (pgio->pg_dreq != NULL && | |
1197 | !is_aligned_req(req, SECTOR_SIZE)) | |
1198 | return false; | |
1199 | ||
1200 | return pnfs_generic_pg_test(pgio, prev, req); | |
1201 | } | |
1202 | ||
6296556f PT |
1203 | /* |
1204 | * Return the number of contiguous bytes for a given inode | |
1205 | * starting at page frame idx. | |
1206 | */ | |
1207 | static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) | |
1208 | { | |
1209 | struct address_space *mapping = inode->i_mapping; | |
1210 | pgoff_t end; | |
1211 | ||
1212 | /* Optimize common case that writes from 0 to end of file */ | |
1213 | end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE); | |
1214 | if (end != NFS_I(inode)->npages) { | |
1215 | rcu_read_lock(); | |
e7b563bb | 1216 | end = page_cache_next_hole(mapping, idx + 1, ULONG_MAX); |
6296556f PT |
1217 | rcu_read_unlock(); |
1218 | } | |
1219 | ||
1220 | if (!end) | |
1221 | return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT); | |
1222 | else | |
1223 | return (end - idx) << PAGE_CACHE_SHIFT; | |
1224 | } | |
1225 | ||
6f018efa | 1226 | static void |
96c9eae6 PT |
1227 | bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
1228 | { | |
1229 | if (pgio->pg_dreq != NULL && | |
6296556f | 1230 | !is_aligned_req(req, PAGE_CACHE_SIZE)) { |
96c9eae6 | 1231 | nfs_pageio_reset_write_mds(pgio); |
6296556f PT |
1232 | } else { |
1233 | u64 wb_size; | |
1234 | if (pgio->pg_dreq == NULL) | |
1235 | wb_size = pnfs_num_cont_bytes(pgio->pg_inode, | |
1236 | req->wb_index); | |
1237 | else | |
1238 | wb_size = nfs_dreq_bytes_left(pgio->pg_dreq); | |
1239 | ||
1240 | pnfs_generic_pg_init_write(pgio, req, wb_size); | |
1241 | } | |
96c9eae6 PT |
1242 | } |
1243 | ||
1244 | static bool | |
1245 | bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, | |
1246 | struct nfs_page *req) | |
1247 | { | |
1248 | if (pgio->pg_dreq != NULL && | |
1249 | !is_aligned_req(req, PAGE_CACHE_SIZE)) | |
1250 | return false; | |
1251 | ||
1252 | return pnfs_generic_pg_test(pgio, prev, req); | |
1253 | } | |
1254 | ||
e9643fe8 | 1255 | static const struct nfs_pageio_ops bl_pg_read_ops = { |
f742dc4a PT |
1256 | .pg_init = bl_pg_init_read, |
1257 | .pg_test = bl_pg_test_read, | |
e9643fe8 BH |
1258 | .pg_doio = pnfs_generic_pg_readpages, |
1259 | }; | |
1260 | ||
1261 | static const struct nfs_pageio_ops bl_pg_write_ops = { | |
96c9eae6 PT |
1262 | .pg_init = bl_pg_init_write, |
1263 | .pg_test = bl_pg_test_write, | |
e9643fe8 BH |
1264 | .pg_doio = pnfs_generic_pg_writepages, |
1265 | }; | |
1266 | ||
155e7524 FI |
1267 | static struct pnfs_layoutdriver_type blocklayout_type = { |
1268 | .id = LAYOUT_BLOCK_VOLUME, | |
1269 | .name = "LAYOUT_BLOCK_VOLUME", | |
5a12cca6 | 1270 | .owner = THIS_MODULE, |
155e7524 FI |
1271 | .read_pagelist = bl_read_pagelist, |
1272 | .write_pagelist = bl_write_pagelist, | |
1273 | .alloc_layout_hdr = bl_alloc_layout_hdr, | |
1274 | .free_layout_hdr = bl_free_layout_hdr, | |
1275 | .alloc_lseg = bl_alloc_lseg, | |
1276 | .free_lseg = bl_free_lseg, | |
1277 | .encode_layoutcommit = bl_encode_layoutcommit, | |
1278 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, | |
1279 | .set_layoutdriver = bl_set_layoutdriver, | |
1280 | .clear_layoutdriver = bl_clear_layoutdriver, | |
e9643fe8 BH |
1281 | .pg_read_ops = &bl_pg_read_ops, |
1282 | .pg_write_ops = &bl_pg_write_ops, | |
155e7524 FI |
1283 | }; |
1284 | ||
fe0a9b74 | 1285 | static const struct rpc_pipe_ops bl_upcall_ops = { |
c1225158 | 1286 | .upcall = rpc_pipe_generic_upcall, |
fe0a9b74 JR |
1287 | .downcall = bl_pipe_downcall, |
1288 | .destroy_msg = bl_pipe_destroy_msg, | |
1289 | }; | |
1290 | ||
332dfab6 SK |
1291 | static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, |
1292 | struct rpc_pipe *pipe) | |
1293 | { | |
1294 | struct dentry *dir, *dentry; | |
1295 | ||
1296 | dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); | |
1297 | if (dir == NULL) | |
1298 | return ERR_PTR(-ENOENT); | |
1299 | dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); | |
1300 | dput(dir); | |
1301 | return dentry; | |
1302 | } | |
1303 | ||
1304 | static void nfs4blocklayout_unregister_sb(struct super_block *sb, | |
1305 | struct rpc_pipe *pipe) | |
1306 | { | |
1307 | if (pipe->dentry) | |
1308 | rpc_unlink(pipe->dentry); | |
1309 | } | |
1310 | ||
627f3066 SK |
1311 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
1312 | void *ptr) | |
1313 | { | |
1314 | struct super_block *sb = ptr; | |
1315 | struct net *net = sb->s_fs_info; | |
1316 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1317 | struct dentry *dentry; | |
1318 | int ret = 0; | |
1319 | ||
1320 | if (!try_module_get(THIS_MODULE)) | |
1321 | return 0; | |
1322 | ||
1323 | if (nn->bl_device_pipe == NULL) { | |
1324 | module_put(THIS_MODULE); | |
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | switch (event) { | |
1329 | case RPC_PIPEFS_MOUNT: | |
1330 | dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); | |
1331 | if (IS_ERR(dentry)) { | |
1332 | ret = PTR_ERR(dentry); | |
1333 | break; | |
1334 | } | |
1335 | nn->bl_device_pipe->dentry = dentry; | |
1336 | break; | |
1337 | case RPC_PIPEFS_UMOUNT: | |
1338 | if (nn->bl_device_pipe->dentry) | |
1339 | nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); | |
1340 | break; | |
1341 | default: | |
1342 | ret = -ENOTSUPP; | |
1343 | break; | |
1344 | } | |
1345 | module_put(THIS_MODULE); | |
1346 | return ret; | |
1347 | } | |
1348 | ||
1349 | static struct notifier_block nfs4blocklayout_block = { | |
1350 | .notifier_call = rpc_pipefs_event, | |
1351 | }; | |
1352 | ||
332dfab6 SK |
1353 | static struct dentry *nfs4blocklayout_register_net(struct net *net, |
1354 | struct rpc_pipe *pipe) | |
1355 | { | |
1356 | struct super_block *pipefs_sb; | |
1357 | struct dentry *dentry; | |
1358 | ||
1359 | pipefs_sb = rpc_get_sb_net(net); | |
1360 | if (!pipefs_sb) | |
2561d618 | 1361 | return NULL; |
332dfab6 SK |
1362 | dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); |
1363 | rpc_put_sb_net(net); | |
1364 | return dentry; | |
1365 | } | |
1366 | ||
1367 | static void nfs4blocklayout_unregister_net(struct net *net, | |
1368 | struct rpc_pipe *pipe) | |
1369 | { | |
1370 | struct super_block *pipefs_sb; | |
1371 | ||
1372 | pipefs_sb = rpc_get_sb_net(net); | |
1373 | if (pipefs_sb) { | |
1374 | nfs4blocklayout_unregister_sb(pipefs_sb, pipe); | |
1375 | rpc_put_sb_net(net); | |
1376 | } | |
1377 | } | |
1378 | ||
9e2e74db SK |
1379 | static int nfs4blocklayout_net_init(struct net *net) |
1380 | { | |
1381 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1382 | struct dentry *dentry; | |
1383 | ||
5ffaf855 | 1384 | init_waitqueue_head(&nn->bl_wq); |
9e2e74db SK |
1385 | nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); |
1386 | if (IS_ERR(nn->bl_device_pipe)) | |
1387 | return PTR_ERR(nn->bl_device_pipe); | |
1388 | dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); | |
1389 | if (IS_ERR(dentry)) { | |
1390 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
1391 | return PTR_ERR(dentry); | |
1392 | } | |
1393 | nn->bl_device_pipe->dentry = dentry; | |
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | static void nfs4blocklayout_net_exit(struct net *net) | |
1398 | { | |
1399 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1400 | ||
1401 | nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); | |
1402 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
1403 | nn->bl_device_pipe = NULL; | |
1404 | } | |
1405 | ||
1406 | static struct pernet_operations nfs4blocklayout_net_ops = { | |
1407 | .init = nfs4blocklayout_net_init, | |
1408 | .exit = nfs4blocklayout_net_exit, | |
1409 | }; | |
1410 | ||
155e7524 FI |
1411 | static int __init nfs4blocklayout_init(void) |
1412 | { | |
1413 | int ret; | |
1414 | ||
1415 | dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); | |
1416 | ||
1417 | ret = pnfs_register_layoutdriver(&blocklayout_type); | |
fe0a9b74 JR |
1418 | if (ret) |
1419 | goto out; | |
1420 | ||
627f3066 | 1421 | ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); |
9e2e74db SK |
1422 | if (ret) |
1423 | goto out_remove; | |
627f3066 SK |
1424 | ret = register_pernet_subsys(&nfs4blocklayout_net_ops); |
1425 | if (ret) | |
1426 | goto out_notifier; | |
fe0a9b74 JR |
1427 | out: |
1428 | return ret; | |
1429 | ||
627f3066 SK |
1430 | out_notifier: |
1431 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); | |
fe0a9b74 JR |
1432 | out_remove: |
1433 | pnfs_unregister_layoutdriver(&blocklayout_type); | |
155e7524 FI |
1434 | return ret; |
1435 | } | |
1436 | ||
1437 | static void __exit nfs4blocklayout_exit(void) | |
1438 | { | |
1439 | dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", | |
1440 | __func__); | |
1441 | ||
627f3066 | 1442 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
9e2e74db | 1443 | unregister_pernet_subsys(&nfs4blocklayout_net_ops); |
155e7524 FI |
1444 | pnfs_unregister_layoutdriver(&blocklayout_type); |
1445 | } | |
1446 | ||
1447 | MODULE_ALIAS("nfs-layouttype4-3"); | |
1448 | ||
1449 | module_init(nfs4blocklayout_init); | |
1450 | module_exit(nfs4blocklayout_exit); |