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 */ |
88c9e421 | 38 | #include <linux/prefetch.h> |
6296556f | 39 | #include <linux/pagevec.h> |
155e7524 | 40 | |
10bd295a | 41 | #include "../pnfs.h" |
76e697ba | 42 | #include "../nfs4session.h" |
10bd295a | 43 | #include "../internal.h" |
155e7524 FI |
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 | ||
9549ec01 FI |
52 | /* Given the be associated with isect, determine if page data needs to be |
53 | * initialized. | |
54 | */ | |
55 | static int is_hole(struct pnfs_block_extent *be, sector_t isect) | |
56 | { | |
57 | if (be->be_state == PNFS_BLOCK_NONE_DATA) | |
58 | return 1; | |
59 | else if (be->be_state != PNFS_BLOCK_INVALID_DATA) | |
60 | return 0; | |
61 | else | |
62 | return !bl_is_sector_init(be->be_inval, isect); | |
63 | } | |
64 | ||
650e2d39 FI |
65 | /* Given the be associated with isect, determine if page data can be |
66 | * written to disk. | |
67 | */ | |
68 | static int is_writable(struct pnfs_block_extent *be, sector_t isect) | |
69 | { | |
71cdd40f PT |
70 | return (be->be_state == PNFS_BLOCK_READWRITE_DATA || |
71 | be->be_state == PNFS_BLOCK_INVALID_DATA); | |
650e2d39 FI |
72 | } |
73 | ||
9549ec01 FI |
74 | /* The data we are handed might be spread across several bios. We need |
75 | * to track when the last one is finished. | |
76 | */ | |
77 | struct parallel_io { | |
78 | struct kref refcnt; | |
7c5465d6 | 79 | void (*pnfs_callback) (void *data, int num_se); |
9549ec01 | 80 | void *data; |
7c5465d6 | 81 | int bse_count; |
9549ec01 FI |
82 | }; |
83 | ||
84 | static inline struct parallel_io *alloc_parallel(void *data) | |
85 | { | |
86 | struct parallel_io *rv; | |
87 | ||
88 | rv = kmalloc(sizeof(*rv), GFP_NOFS); | |
89 | if (rv) { | |
90 | rv->data = data; | |
91 | kref_init(&rv->refcnt); | |
7c5465d6 | 92 | rv->bse_count = 0; |
9549ec01 FI |
93 | } |
94 | return rv; | |
95 | } | |
96 | ||
97 | static inline void get_parallel(struct parallel_io *p) | |
98 | { | |
99 | kref_get(&p->refcnt); | |
100 | } | |
101 | ||
102 | static void destroy_parallel(struct kref *kref) | |
103 | { | |
104 | struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); | |
105 | ||
106 | dprintk("%s enter\n", __func__); | |
7c5465d6 | 107 | p->pnfs_callback(p->data, p->bse_count); |
9549ec01 FI |
108 | kfree(p); |
109 | } | |
110 | ||
111 | static inline void put_parallel(struct parallel_io *p) | |
112 | { | |
113 | kref_put(&p->refcnt, destroy_parallel); | |
114 | } | |
115 | ||
116 | static struct bio * | |
117 | bl_submit_bio(int rw, struct bio *bio) | |
118 | { | |
119 | if (bio) { | |
120 | get_parallel(bio->bi_private); | |
121 | dprintk("%s submitting %s bio %u@%llu\n", __func__, | |
4f024f37 KO |
122 | rw == READ ? "read" : "write", bio->bi_iter.bi_size, |
123 | (unsigned long long)bio->bi_iter.bi_sector); | |
9549ec01 FI |
124 | submit_bio(rw, bio); |
125 | } | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | static struct bio *bl_alloc_init_bio(int npg, sector_t isect, | |
130 | struct pnfs_block_extent *be, | |
131 | void (*end_io)(struct bio *, int err), | |
132 | struct parallel_io *par) | |
133 | { | |
134 | struct bio *bio; | |
135 | ||
74a6eeb4 | 136 | npg = min(npg, BIO_MAX_PAGES); |
9549ec01 | 137 | bio = bio_alloc(GFP_NOIO, npg); |
74a6eeb4 PT |
138 | if (!bio && (current->flags & PF_MEMALLOC)) { |
139 | while (!bio && (npg /= 2)) | |
140 | bio = bio_alloc(GFP_NOIO, npg); | |
141 | } | |
9549ec01 | 142 | |
74a6eeb4 | 143 | if (bio) { |
4f024f37 KO |
144 | bio->bi_iter.bi_sector = isect - be->be_f_offset + |
145 | be->be_v_offset; | |
74a6eeb4 PT |
146 | bio->bi_bdev = be->be_mdev; |
147 | bio->bi_end_io = end_io; | |
148 | bio->bi_private = par; | |
149 | } | |
9549ec01 FI |
150 | return bio; |
151 | } | |
152 | ||
fe6e1e8d | 153 | static struct bio *do_add_page_to_bio(struct bio *bio, int npg, int rw, |
9549ec01 FI |
154 | sector_t isect, struct page *page, |
155 | struct pnfs_block_extent *be, | |
156 | void (*end_io)(struct bio *, int err), | |
fe6e1e8d PT |
157 | struct parallel_io *par, |
158 | unsigned int offset, int len) | |
9549ec01 | 159 | { |
fe6e1e8d PT |
160 | isect = isect + (offset >> SECTOR_SHIFT); |
161 | dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, | |
162 | npg, rw, (unsigned long long)isect, offset, len); | |
9549ec01 FI |
163 | retry: |
164 | if (!bio) { | |
165 | bio = bl_alloc_init_bio(npg, isect, be, end_io, par); | |
166 | if (!bio) | |
167 | return ERR_PTR(-ENOMEM); | |
168 | } | |
fe6e1e8d | 169 | if (bio_add_page(bio, page, len, offset) < len) { |
9549ec01 FI |
170 | bio = bl_submit_bio(rw, bio); |
171 | goto retry; | |
172 | } | |
173 | return bio; | |
174 | } | |
175 | ||
9549ec01 FI |
176 | static void bl_end_io_read(struct bio *bio, int err) |
177 | { | |
178 | struct parallel_io *par = bio->bi_private; | |
9549ec01 | 179 | |
2c30c71b | 180 | if (err) { |
d45f60c6 | 181 | struct nfs_pgio_header *header = par->data; |
cd841605 FI |
182 | |
183 | if (!header->pnfs_error) | |
184 | header->pnfs_error = -EIO; | |
185 | pnfs_set_lo_fail(header->lseg); | |
9549ec01 | 186 | } |
8c792ea9 | 187 | |
9549ec01 FI |
188 | bio_put(bio); |
189 | put_parallel(par); | |
190 | } | |
191 | ||
192 | static void bl_read_cleanup(struct work_struct *work) | |
193 | { | |
194 | struct rpc_task *task; | |
d45f60c6 | 195 | struct nfs_pgio_header *hdr; |
9549ec01 FI |
196 | dprintk("%s enter\n", __func__); |
197 | task = container_of(work, struct rpc_task, u.tk_work); | |
d45f60c6 WAA |
198 | hdr = container_of(task, struct nfs_pgio_header, task); |
199 | pnfs_ld_read_done(hdr); | |
9549ec01 FI |
200 | } |
201 | ||
202 | static void | |
7c5465d6 | 203 | bl_end_par_io_read(void *data, int unused) |
9549ec01 | 204 | { |
d45f60c6 | 205 | struct nfs_pgio_header *hdr = data; |
9549ec01 | 206 | |
d45f60c6 WAA |
207 | hdr->task.tk_status = hdr->pnfs_error; |
208 | INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup); | |
209 | schedule_work(&hdr->task.u.tk_work); | |
9549ec01 FI |
210 | } |
211 | ||
155e7524 | 212 | static enum pnfs_try_status |
d45f60c6 | 213 | bl_read_pagelist(struct nfs_pgio_header *hdr) |
155e7524 | 214 | { |
d45f60c6 | 215 | struct nfs_pgio_header *header = hdr; |
9549ec01 FI |
216 | int i, hole; |
217 | struct bio *bio = NULL; | |
218 | struct pnfs_block_extent *be = NULL, *cow_read = NULL; | |
219 | sector_t isect, extent_length = 0; | |
220 | struct parallel_io *par; | |
d45f60c6 WAA |
221 | loff_t f_offset = hdr->args.offset; |
222 | size_t bytes_left = hdr->args.count; | |
f742dc4a | 223 | unsigned int pg_offset, pg_len; |
d45f60c6 WAA |
224 | struct page **pages = hdr->args.pages; |
225 | int pg_index = hdr->args.pgbase >> PAGE_CACHE_SHIFT; | |
f742dc4a | 226 | const bool is_dio = (header->dreq != NULL); |
be98fd0a | 227 | struct blk_plug plug; |
9549ec01 | 228 | |
6f00866d | 229 | dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, |
d45f60c6 WAA |
230 | hdr->page_array.npages, f_offset, |
231 | (unsigned int)hdr->args.count); | |
9549ec01 | 232 | |
d45f60c6 | 233 | par = alloc_parallel(hdr); |
9549ec01 FI |
234 | if (!par) |
235 | goto use_mds; | |
9549ec01 FI |
236 | par->pnfs_callback = bl_end_par_io_read; |
237 | /* At this point, we can no longer jump to use_mds */ | |
238 | ||
be98fd0a CH |
239 | blk_start_plug(&plug); |
240 | ||
9549ec01 FI |
241 | isect = (sector_t) (f_offset >> SECTOR_SHIFT); |
242 | /* Code assumes extents are page-aligned */ | |
d45f60c6 | 243 | for (i = pg_index; i < hdr->page_array.npages; i++) { |
921b81a8 | 244 | if (extent_length <= 0) { |
9549ec01 FI |
245 | /* We've used up the previous extent */ |
246 | bl_put_extent(be); | |
247 | bl_put_extent(cow_read); | |
248 | bio = bl_submit_bio(READ, bio); | |
249 | /* Get the next one */ | |
cd841605 | 250 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), |
9549ec01 FI |
251 | isect, &cow_read); |
252 | if (!be) { | |
cd841605 | 253 | header->pnfs_error = -EIO; |
9549ec01 FI |
254 | goto out; |
255 | } | |
256 | extent_length = be->be_length - | |
257 | (isect - be->be_f_offset); | |
258 | if (cow_read) { | |
259 | sector_t cow_length = cow_read->be_length - | |
260 | (isect - cow_read->be_f_offset); | |
261 | extent_length = min(extent_length, cow_length); | |
262 | } | |
263 | } | |
f742dc4a | 264 | |
3a6fd1f0 | 265 | pg_offset = f_offset & ~PAGE_CACHE_MASK; |
f742dc4a | 266 | if (is_dio) { |
f742dc4a PT |
267 | if (pg_offset + bytes_left > PAGE_CACHE_SIZE) |
268 | pg_len = PAGE_CACHE_SIZE - pg_offset; | |
269 | else | |
270 | pg_len = bytes_left; | |
271 | ||
272 | f_offset += pg_len; | |
273 | bytes_left -= pg_len; | |
274 | isect += (pg_offset >> SECTOR_SHIFT); | |
921b81a8 | 275 | extent_length -= (pg_offset >> SECTOR_SHIFT); |
f742dc4a | 276 | } else { |
3a6fd1f0 | 277 | BUG_ON(pg_offset != 0); |
f742dc4a PT |
278 | pg_len = PAGE_CACHE_SIZE; |
279 | } | |
280 | ||
9549ec01 FI |
281 | hole = is_hole(be, isect); |
282 | if (hole && !cow_read) { | |
283 | bio = bl_submit_bio(READ, bio); | |
284 | /* Fill hole w/ zeroes w/o accessing device */ | |
285 | dprintk("%s Zeroing page for hole\n", __func__); | |
f742dc4a | 286 | zero_user_segment(pages[i], pg_offset, pg_len); |
9549ec01 FI |
287 | } else { |
288 | struct pnfs_block_extent *be_read; | |
289 | ||
290 | be_read = (hole && cow_read) ? cow_read : be; | |
823b0c9d | 291 | bio = do_add_page_to_bio(bio, |
d45f60c6 | 292 | hdr->page_array.npages - i, |
30dd374f | 293 | READ, |
9549ec01 | 294 | isect, pages[i], be_read, |
f742dc4a PT |
295 | bl_end_io_read, par, |
296 | pg_offset, pg_len); | |
9549ec01 | 297 | if (IS_ERR(bio)) { |
cd841605 | 298 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 299 | bio = NULL; |
9549ec01 FI |
300 | goto out; |
301 | } | |
302 | } | |
f742dc4a | 303 | isect += (pg_len >> SECTOR_SHIFT); |
921b81a8 | 304 | extent_length -= (pg_len >> SECTOR_SHIFT); |
9549ec01 | 305 | } |
cd841605 | 306 | if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
d45f60c6 WAA |
307 | hdr->res.eof = 1; |
308 | hdr->res.count = header->inode->i_size - hdr->args.offset; | |
9549ec01 | 309 | } else { |
d45f60c6 | 310 | hdr->res.count = (isect << SECTOR_SHIFT) - hdr->args.offset; |
9549ec01 FI |
311 | } |
312 | out: | |
313 | bl_put_extent(be); | |
314 | bl_put_extent(cow_read); | |
315 | bl_submit_bio(READ, bio); | |
be98fd0a | 316 | blk_finish_plug(&plug); |
9549ec01 FI |
317 | put_parallel(par); |
318 | return PNFS_ATTEMPTED; | |
319 | ||
320 | use_mds: | |
321 | dprintk("Giving up and using normal NFS\n"); | |
155e7524 FI |
322 | return PNFS_NOT_ATTEMPTED; |
323 | } | |
324 | ||
31e6306a FI |
325 | static void mark_extents_written(struct pnfs_block_layout *bl, |
326 | __u64 offset, __u32 count) | |
327 | { | |
328 | sector_t isect, end; | |
329 | struct pnfs_block_extent *be; | |
7c5465d6 | 330 | struct pnfs_block_short_extent *se; |
31e6306a FI |
331 | |
332 | dprintk("%s(%llu, %u)\n", __func__, offset, count); | |
333 | if (count == 0) | |
334 | return; | |
335 | isect = (offset & (long)(PAGE_CACHE_MASK)) >> SECTOR_SHIFT; | |
336 | end = (offset + count + PAGE_CACHE_SIZE - 1) & (long)(PAGE_CACHE_MASK); | |
337 | end >>= SECTOR_SHIFT; | |
338 | while (isect < end) { | |
339 | sector_t len; | |
340 | be = bl_find_get_extent(bl, isect, NULL); | |
341 | BUG_ON(!be); /* FIXME */ | |
342 | len = min(end, be->be_f_offset + be->be_length) - isect; | |
7c5465d6 PT |
343 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
344 | se = bl_pop_one_short_extent(be->be_inval); | |
345 | BUG_ON(!se); | |
346 | bl_mark_for_commit(be, isect, len, se); | |
347 | } | |
31e6306a FI |
348 | isect += len; |
349 | bl_put_extent(be); | |
350 | } | |
351 | } | |
352 | ||
650e2d39 FI |
353 | static void bl_end_io_write(struct bio *bio, int err) |
354 | { | |
355 | struct parallel_io *par = bio->bi_private; | |
356 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d45f60c6 | 357 | struct nfs_pgio_header *header = par->data; |
650e2d39 FI |
358 | |
359 | if (!uptodate) { | |
cd841605 FI |
360 | if (!header->pnfs_error) |
361 | header->pnfs_error = -EIO; | |
362 | pnfs_set_lo_fail(header->lseg); | |
650e2d39 FI |
363 | } |
364 | bio_put(bio); | |
365 | put_parallel(par); | |
366 | } | |
367 | ||
368 | /* Function scheduled for call during bl_end_par_io_write, | |
369 | * it marks sectors as written and extends the commitlist. | |
370 | */ | |
371 | static void bl_write_cleanup(struct work_struct *work) | |
372 | { | |
373 | struct rpc_task *task; | |
d45f60c6 | 374 | struct nfs_pgio_header *hdr; |
650e2d39 FI |
375 | dprintk("%s enter\n", __func__); |
376 | task = container_of(work, struct rpc_task, u.tk_work); | |
d45f60c6 WAA |
377 | hdr = container_of(task, struct nfs_pgio_header, task); |
378 | if (likely(!hdr->pnfs_error)) { | |
31e6306a | 379 | /* Marks for LAYOUTCOMMIT */ |
d45f60c6 WAA |
380 | mark_extents_written(BLK_LSEG2EXT(hdr->lseg), |
381 | hdr->args.offset, hdr->args.count); | |
31e6306a | 382 | } |
d45f60c6 | 383 | pnfs_ld_write_done(hdr); |
650e2d39 FI |
384 | } |
385 | ||
386 | /* Called when last of bios associated with a bl_write_pagelist call finishes */ | |
7c5465d6 | 387 | static void bl_end_par_io_write(void *data, int num_se) |
650e2d39 | 388 | { |
d45f60c6 | 389 | struct nfs_pgio_header *hdr = data; |
650e2d39 | 390 | |
d45f60c6 WAA |
391 | if (unlikely(hdr->pnfs_error)) { |
392 | bl_free_short_extents(&BLK_LSEG2EXT(hdr->lseg)->bl_inval, | |
7c5465d6 PT |
393 | num_se); |
394 | } | |
395 | ||
d45f60c6 | 396 | hdr->task.tk_status = hdr->pnfs_error; |
c65e6254 | 397 | hdr->verf.committed = NFS_FILE_SYNC; |
d45f60c6 WAA |
398 | INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup); |
399 | schedule_work(&hdr->task.u.tk_work); | |
650e2d39 FI |
400 | } |
401 | ||
155e7524 | 402 | static enum pnfs_try_status |
d45f60c6 | 403 | bl_write_pagelist(struct nfs_pgio_header *header, int sync) |
155e7524 | 404 | { |
3a6fd1f0 | 405 | int i, ret; |
650e2d39 | 406 | struct bio *bio = NULL; |
3a6fd1f0 CH |
407 | struct pnfs_block_extent *be = NULL; |
408 | sector_t isect, extent_length = 0; | |
96c9eae6 | 409 | struct parallel_io *par = NULL; |
d45f60c6 WAA |
410 | loff_t offset = header->args.offset; |
411 | size_t count = header->args.count; | |
d45f60c6 | 412 | struct page **pages = header->args.pages; |
3a6fd1f0 | 413 | int pg_index = pg_index = header->args.pgbase >> PAGE_CACHE_SHIFT; |
be98fd0a | 414 | struct blk_plug plug; |
650e2d39 FI |
415 | |
416 | dprintk("%s enter, %Zu@%lld\n", __func__, count, offset); | |
96c9eae6 | 417 | |
d45f60c6 | 418 | /* At this point, header->page_aray is a (sequential) list of nfs_pages. |
71cdd40f PT |
419 | * We want to write each, and if there is an error set pnfs_error |
420 | * to have it redone using nfs. | |
650e2d39 | 421 | */ |
d45f60c6 | 422 | par = alloc_parallel(header); |
650e2d39 | 423 | if (!par) |
7c5465d6 | 424 | goto out_mds; |
650e2d39 FI |
425 | par->pnfs_callback = bl_end_par_io_write; |
426 | /* At this point, have to be more careful with error handling */ | |
427 | ||
3a6fd1f0 | 428 | blk_start_plug(&plug); |
71cdd40f | 429 | |
3a6fd1f0 CH |
430 | /* we always write out the whole page */ |
431 | offset = offset & (loff_t)PAGE_CACHE_MASK; | |
432 | isect = offset >> SECTOR_SHIFT; | |
71cdd40f | 433 | |
d45f60c6 | 434 | for (i = pg_index; i < header->page_array.npages; i++) { |
921b81a8 | 435 | if (extent_length <= 0) { |
650e2d39 FI |
436 | /* We've used up the previous extent */ |
437 | bl_put_extent(be); | |
438 | bio = bl_submit_bio(WRITE, bio); | |
439 | /* Get the next one */ | |
cd841605 | 440 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), |
3a6fd1f0 | 441 | isect, NULL); |
650e2d39 | 442 | if (!be || !is_writable(be, isect)) { |
cd841605 | 443 | header->pnfs_error = -EINVAL; |
650e2d39 FI |
444 | goto out; |
445 | } | |
7c5465d6 PT |
446 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
447 | if (likely(!bl_push_one_short_extent( | |
448 | be->be_inval))) | |
449 | par->bse_count++; | |
450 | else { | |
cd841605 | 451 | header->pnfs_error = -ENOMEM; |
7c5465d6 PT |
452 | goto out; |
453 | } | |
454 | } | |
650e2d39 | 455 | extent_length = be->be_length - |
71cdd40f | 456 | (isect - be->be_f_offset); |
650e2d39 | 457 | } |
fe6e1e8d | 458 | |
3a6fd1f0 | 459 | BUG_ON(offset & ~PAGE_CACHE_MASK); |
fe6e1e8d | 460 | |
fe6e1e8d PT |
461 | if (be->be_state == PNFS_BLOCK_INVALID_DATA && |
462 | !bl_is_sector_init(be->be_inval, isect)) { | |
71cdd40f | 463 | ret = bl_mark_sectors_init(be->be_inval, isect, |
60c52e3a | 464 | PAGE_CACHE_SECTORS); |
71cdd40f PT |
465 | if (unlikely(ret)) { |
466 | dprintk("%s bl_mark_sectors_init fail %d\n", | |
467 | __func__, ret); | |
cd841605 | 468 | header->pnfs_error = ret; |
71cdd40f | 469 | goto out; |
650e2d39 | 470 | } |
71cdd40f | 471 | } |
fe6e1e8d | 472 | |
d45f60c6 | 473 | bio = do_add_page_to_bio(bio, header->page_array.npages - i, |
3a6fd1f0 | 474 | WRITE, isect, pages[i], be, |
fe6e1e8d | 475 | bl_end_io_write, par, |
3a6fd1f0 | 476 | 0, PAGE_CACHE_SIZE); |
71cdd40f | 477 | if (IS_ERR(bio)) { |
cd841605 | 478 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 479 | bio = NULL; |
71cdd40f | 480 | goto out; |
650e2d39 | 481 | } |
3a6fd1f0 CH |
482 | offset += PAGE_CACHE_SIZE; |
483 | count -= PAGE_CACHE_SIZE; | |
650e2d39 FI |
484 | isect += PAGE_CACHE_SECTORS; |
485 | extent_length -= PAGE_CACHE_SECTORS; | |
486 | } | |
71cdd40f | 487 | |
d45f60c6 | 488 | header->res.count = header->args.count; |
650e2d39 FI |
489 | out: |
490 | bl_put_extent(be); | |
491 | bl_submit_bio(WRITE, bio); | |
be98fd0a | 492 | blk_finish_plug(&plug); |
650e2d39 FI |
493 | put_parallel(par); |
494 | return PNFS_ATTEMPTED; | |
7c5465d6 | 495 | out_mds: |
7c5465d6 | 496 | return PNFS_NOT_ATTEMPTED; |
155e7524 FI |
497 | } |
498 | ||
9e692969 | 499 | /* FIXME - range ignored */ |
155e7524 | 500 | static void |
9e692969 | 501 | release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range) |
155e7524 | 502 | { |
9e692969 FI |
503 | int i; |
504 | struct pnfs_block_extent *be; | |
505 | ||
506 | spin_lock(&bl->bl_ext_lock); | |
507 | for (i = 0; i < EXTENT_LISTS; i++) { | |
508 | while (!list_empty(&bl->bl_extents[i])) { | |
509 | be = list_first_entry(&bl->bl_extents[i], | |
510 | struct pnfs_block_extent, | |
511 | be_node); | |
512 | list_del(&be->be_node); | |
513 | bl_put_extent(be); | |
514 | } | |
515 | } | |
516 | spin_unlock(&bl->bl_ext_lock); | |
155e7524 FI |
517 | } |
518 | ||
155e7524 FI |
519 | static void |
520 | release_inval_marks(struct pnfs_inval_markings *marks) | |
521 | { | |
c1c2a4cd | 522 | struct pnfs_inval_tracking *pos, *temp; |
7c5465d6 | 523 | struct pnfs_block_short_extent *se, *stemp; |
c1c2a4cd FI |
524 | |
525 | list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) { | |
526 | list_del(&pos->it_link); | |
527 | kfree(pos); | |
528 | } | |
7c5465d6 PT |
529 | |
530 | list_for_each_entry_safe(se, stemp, &marks->im_extents, bse_node) { | |
531 | list_del(&se->bse_node); | |
532 | kfree(se); | |
533 | } | |
155e7524 FI |
534 | return; |
535 | } | |
536 | ||
537 | static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
538 | { | |
539 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); | |
540 | ||
541 | dprintk("%s enter\n", __func__); | |
542 | release_extents(bl, NULL); | |
543 | release_inval_marks(&bl->bl_inval); | |
544 | kfree(bl); | |
545 | } | |
546 | ||
547 | static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, | |
548 | gfp_t gfp_flags) | |
549 | { | |
550 | struct pnfs_block_layout *bl; | |
551 | ||
552 | dprintk("%s enter\n", __func__); | |
553 | bl = kzalloc(sizeof(*bl), gfp_flags); | |
554 | if (!bl) | |
555 | return NULL; | |
556 | spin_lock_init(&bl->bl_ext_lock); | |
557 | INIT_LIST_HEAD(&bl->bl_extents[0]); | |
558 | INIT_LIST_HEAD(&bl->bl_extents[1]); | |
559 | INIT_LIST_HEAD(&bl->bl_commit); | |
560 | INIT_LIST_HEAD(&bl->bl_committing); | |
561 | bl->bl_count = 0; | |
562 | bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT; | |
563 | BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize); | |
564 | return &bl->bl_layout; | |
565 | } | |
566 | ||
a60d2ebd | 567 | static void bl_free_lseg(struct pnfs_layout_segment *lseg) |
155e7524 | 568 | { |
a60d2ebd FI |
569 | dprintk("%s enter\n", __func__); |
570 | kfree(lseg); | |
155e7524 FI |
571 | } |
572 | ||
a60d2ebd FI |
573 | /* We pretty much ignore lseg, and store all data layout wide, so we |
574 | * can correctly merge. | |
575 | */ | |
576 | static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo, | |
577 | struct nfs4_layoutget_res *lgr, | |
578 | gfp_t gfp_flags) | |
155e7524 | 579 | { |
a60d2ebd FI |
580 | struct pnfs_layout_segment *lseg; |
581 | int status; | |
582 | ||
583 | dprintk("%s enter\n", __func__); | |
584 | lseg = kzalloc(sizeof(*lseg), gfp_flags); | |
585 | if (!lseg) | |
586 | return ERR_PTR(-ENOMEM); | |
587 | status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags); | |
588 | if (status) { | |
589 | /* We don't want to call the full-blown bl_free_lseg, | |
590 | * since on error extents were not touched. | |
591 | */ | |
592 | kfree(lseg); | |
593 | return ERR_PTR(status); | |
594 | } | |
595 | return lseg; | |
155e7524 FI |
596 | } |
597 | ||
598 | static void | |
599 | bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr, | |
600 | const struct nfs4_layoutcommit_args *arg) | |
601 | { | |
90ace12a FI |
602 | dprintk("%s enter\n", __func__); |
603 | encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo), xdr, arg); | |
155e7524 FI |
604 | } |
605 | ||
606 | static void | |
607 | bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) | |
608 | { | |
b2be7811 FI |
609 | struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout; |
610 | ||
611 | dprintk("%s enter\n", __func__); | |
612 | clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo), &lcdata->args, lcdata->res.status); | |
155e7524 FI |
613 | } |
614 | ||
2f9fd182 FI |
615 | static void free_blk_mountid(struct block_mount_id *mid) |
616 | { | |
617 | if (mid) { | |
93a3844e PT |
618 | struct pnfs_block_dev *dev, *tmp; |
619 | ||
620 | /* No need to take bm_lock as we are last user freeing bm_devlist */ | |
621 | list_for_each_entry_safe(dev, tmp, &mid->bm_devlist, bm_node) { | |
2f9fd182 FI |
622 | list_del(&dev->bm_node); |
623 | bl_free_block_dev(dev); | |
624 | } | |
2f9fd182 FI |
625 | kfree(mid); |
626 | } | |
627 | } | |
628 | ||
78e4e05c | 629 | /* This is mostly copied from the filelayout_get_device_info function. |
2f9fd182 FI |
630 | * It seems much of this should be at the generic pnfs level. |
631 | */ | |
632 | static struct pnfs_block_dev * | |
633 | nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh, | |
634 | struct nfs4_deviceid *d_id) | |
635 | { | |
636 | struct pnfs_device *dev; | |
516f2e24 | 637 | struct pnfs_block_dev *rv; |
2f9fd182 FI |
638 | u32 max_resp_sz; |
639 | int max_pages; | |
640 | struct page **pages = NULL; | |
641 | int i, rc; | |
642 | ||
643 | /* | |
644 | * Use the session max response size as the basis for setting | |
645 | * GETDEVICEINFO's maxcount | |
646 | */ | |
647 | max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; | |
10bd295a | 648 | max_pages = nfs_page_array_len(0, max_resp_sz); |
2f9fd182 FI |
649 | dprintk("%s max_resp_sz %u max_pages %d\n", |
650 | __func__, max_resp_sz, max_pages); | |
651 | ||
652 | dev = kmalloc(sizeof(*dev), GFP_NOFS); | |
653 | if (!dev) { | |
654 | dprintk("%s kmalloc failed\n", __func__); | |
516f2e24 | 655 | return ERR_PTR(-ENOMEM); |
2f9fd182 FI |
656 | } |
657 | ||
f15b5041 | 658 | pages = kcalloc(max_pages, sizeof(struct page *), GFP_NOFS); |
2f9fd182 FI |
659 | if (pages == NULL) { |
660 | kfree(dev); | |
516f2e24 | 661 | return ERR_PTR(-ENOMEM); |
2f9fd182 FI |
662 | } |
663 | for (i = 0; i < max_pages; i++) { | |
664 | pages[i] = alloc_page(GFP_NOFS); | |
516f2e24 JR |
665 | if (!pages[i]) { |
666 | rv = ERR_PTR(-ENOMEM); | |
2f9fd182 | 667 | goto out_free; |
516f2e24 | 668 | } |
2f9fd182 FI |
669 | } |
670 | ||
671 | memcpy(&dev->dev_id, d_id, sizeof(*d_id)); | |
672 | dev->layout_type = LAYOUT_BLOCK_VOLUME; | |
673 | dev->pages = pages; | |
674 | dev->pgbase = 0; | |
675 | dev->pglen = PAGE_SIZE * max_pages; | |
676 | dev->mincount = 0; | |
968fe252 | 677 | dev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead; |
2f9fd182 FI |
678 | |
679 | dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data); | |
cd5875fe | 680 | rc = nfs4_proc_getdeviceinfo(server, dev, NULL); |
2f9fd182 | 681 | dprintk("%s getdevice info returns %d\n", __func__, rc); |
516f2e24 JR |
682 | if (rc) { |
683 | rv = ERR_PTR(rc); | |
2f9fd182 | 684 | goto out_free; |
516f2e24 | 685 | } |
2f9fd182 FI |
686 | |
687 | rv = nfs4_blk_decode_device(server, dev); | |
688 | out_free: | |
689 | for (i = 0; i < max_pages; i++) | |
690 | __free_page(pages[i]); | |
691 | kfree(pages); | |
692 | kfree(dev); | |
693 | return rv; | |
694 | } | |
695 | ||
155e7524 FI |
696 | static int |
697 | bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) | |
698 | { | |
2f9fd182 FI |
699 | struct block_mount_id *b_mt_id = NULL; |
700 | struct pnfs_devicelist *dlist = NULL; | |
701 | struct pnfs_block_dev *bdev; | |
702 | LIST_HEAD(block_disklist); | |
516f2e24 | 703 | int status, i; |
2f9fd182 | 704 | |
155e7524 | 705 | dprintk("%s enter\n", __func__); |
2f9fd182 FI |
706 | |
707 | if (server->pnfs_blksize == 0) { | |
708 | dprintk("%s Server did not return blksize\n", __func__); | |
709 | return -EINVAL; | |
710 | } | |
e3aaf7f2 CH |
711 | if (server->pnfs_blksize > PAGE_SIZE) { |
712 | printk(KERN_ERR "%s: pNFS blksize %d not supported.\n", | |
713 | __func__, server->pnfs_blksize); | |
714 | return -EINVAL; | |
715 | } | |
716 | ||
2f9fd182 FI |
717 | b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS); |
718 | if (!b_mt_id) { | |
719 | status = -ENOMEM; | |
720 | goto out_error; | |
721 | } | |
722 | /* Initialize nfs4 block layout mount id */ | |
723 | spin_lock_init(&b_mt_id->bm_lock); | |
724 | INIT_LIST_HEAD(&b_mt_id->bm_devlist); | |
725 | ||
726 | dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS); | |
727 | if (!dlist) { | |
728 | status = -ENOMEM; | |
729 | goto out_error; | |
730 | } | |
731 | dlist->eof = 0; | |
732 | while (!dlist->eof) { | |
733 | status = nfs4_proc_getdevicelist(server, fh, dlist); | |
734 | if (status) | |
735 | goto out_error; | |
736 | dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n", | |
737 | __func__, dlist->num_devs, dlist->eof); | |
738 | for (i = 0; i < dlist->num_devs; i++) { | |
739 | bdev = nfs4_blk_get_deviceinfo(server, fh, | |
740 | &dlist->dev_id[i]); | |
516f2e24 JR |
741 | if (IS_ERR(bdev)) { |
742 | status = PTR_ERR(bdev); | |
2f9fd182 FI |
743 | goto out_error; |
744 | } | |
745 | spin_lock(&b_mt_id->bm_lock); | |
746 | list_add(&bdev->bm_node, &b_mt_id->bm_devlist); | |
747 | spin_unlock(&b_mt_id->bm_lock); | |
748 | } | |
749 | } | |
750 | dprintk("%s SUCCESS\n", __func__); | |
751 | server->pnfs_ld_data = b_mt_id; | |
752 | ||
753 | out_return: | |
754 | kfree(dlist); | |
755 | return status; | |
756 | ||
757 | out_error: | |
758 | free_blk_mountid(b_mt_id); | |
759 | goto out_return; | |
155e7524 FI |
760 | } |
761 | ||
762 | static int | |
763 | bl_clear_layoutdriver(struct nfs_server *server) | |
764 | { | |
2f9fd182 FI |
765 | struct block_mount_id *b_mt_id = server->pnfs_ld_data; |
766 | ||
155e7524 | 767 | dprintk("%s enter\n", __func__); |
2f9fd182 FI |
768 | free_blk_mountid(b_mt_id); |
769 | dprintk("%s RETURNS\n", __func__); | |
155e7524 FI |
770 | return 0; |
771 | } | |
772 | ||
f742dc4a | 773 | static bool |
3a6fd1f0 CH |
774 | is_aligned_req(struct nfs_pageio_descriptor *pgio, |
775 | struct nfs_page *req, unsigned int alignment) | |
f742dc4a | 776 | { |
3a6fd1f0 CH |
777 | /* |
778 | * Always accept buffered writes, higher layers take care of the | |
779 | * right alignment. | |
780 | */ | |
781 | if (pgio->pg_dreq == NULL) | |
782 | return true; | |
783 | ||
784 | if (!IS_ALIGNED(req->wb_offset, alignment)) | |
785 | return false; | |
786 | ||
787 | if (IS_ALIGNED(req->wb_bytes, alignment)) | |
788 | return true; | |
789 | ||
790 | if (req_offset(req) + req->wb_bytes == i_size_read(pgio->pg_inode)) { | |
791 | /* | |
792 | * If the write goes up to the inode size, just write | |
793 | * the full page. Data past the inode size is | |
794 | * guaranteed to be zeroed by the higher level client | |
795 | * code, and this behaviour is mandated by RFC 5663 | |
796 | * section 2.3.2. | |
797 | */ | |
798 | return true; | |
799 | } | |
800 | ||
801 | return false; | |
f742dc4a PT |
802 | } |
803 | ||
804 | static void | |
805 | bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) | |
806 | { | |
3a6fd1f0 | 807 | if (!is_aligned_req(pgio, req, SECTOR_SIZE)) { |
f742dc4a | 808 | nfs_pageio_reset_read_mds(pgio); |
3a6fd1f0 CH |
809 | return; |
810 | } | |
811 | ||
812 | pnfs_generic_pg_init_read(pgio, req); | |
f742dc4a PT |
813 | } |
814 | ||
b4fdac1a WAA |
815 | /* |
816 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number | |
817 | * of bytes (maximum @req->wb_bytes) that can be coalesced. | |
818 | */ | |
819 | static size_t | |
f742dc4a PT |
820 | bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
821 | struct nfs_page *req) | |
822 | { | |
3a6fd1f0 | 823 | if (!is_aligned_req(pgio, req, SECTOR_SIZE)) |
b4fdac1a | 824 | return 0; |
f742dc4a PT |
825 | return pnfs_generic_pg_test(pgio, prev, req); |
826 | } | |
827 | ||
6296556f PT |
828 | /* |
829 | * Return the number of contiguous bytes for a given inode | |
830 | * starting at page frame idx. | |
831 | */ | |
832 | static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) | |
833 | { | |
834 | struct address_space *mapping = inode->i_mapping; | |
835 | pgoff_t end; | |
836 | ||
837 | /* Optimize common case that writes from 0 to end of file */ | |
838 | end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE); | |
839 | if (end != NFS_I(inode)->npages) { | |
840 | rcu_read_lock(); | |
e7b563bb | 841 | end = page_cache_next_hole(mapping, idx + 1, ULONG_MAX); |
6296556f PT |
842 | rcu_read_unlock(); |
843 | } | |
844 | ||
845 | if (!end) | |
846 | return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT); | |
847 | else | |
848 | return (end - idx) << PAGE_CACHE_SHIFT; | |
849 | } | |
850 | ||
6f018efa | 851 | static void |
96c9eae6 PT |
852 | bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
853 | { | |
3a6fd1f0 CH |
854 | u64 wb_size; |
855 | ||
856 | if (!is_aligned_req(pgio, req, PAGE_SIZE)) { | |
96c9eae6 | 857 | nfs_pageio_reset_write_mds(pgio); |
3a6fd1f0 | 858 | return; |
6296556f | 859 | } |
3a6fd1f0 CH |
860 | |
861 | if (pgio->pg_dreq == NULL) | |
862 | wb_size = pnfs_num_cont_bytes(pgio->pg_inode, | |
863 | req->wb_index); | |
864 | else | |
865 | wb_size = nfs_dreq_bytes_left(pgio->pg_dreq); | |
866 | ||
867 | pnfs_generic_pg_init_write(pgio, req, wb_size); | |
96c9eae6 PT |
868 | } |
869 | ||
b4fdac1a WAA |
870 | /* |
871 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number | |
872 | * of bytes (maximum @req->wb_bytes) that can be coalesced. | |
873 | */ | |
874 | static size_t | |
96c9eae6 PT |
875 | bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
876 | struct nfs_page *req) | |
877 | { | |
3a6fd1f0 | 878 | if (!is_aligned_req(pgio, req, PAGE_SIZE)) |
b4fdac1a | 879 | return 0; |
96c9eae6 PT |
880 | return pnfs_generic_pg_test(pgio, prev, req); |
881 | } | |
882 | ||
e9643fe8 | 883 | static const struct nfs_pageio_ops bl_pg_read_ops = { |
f742dc4a PT |
884 | .pg_init = bl_pg_init_read, |
885 | .pg_test = bl_pg_test_read, | |
e9643fe8 BH |
886 | .pg_doio = pnfs_generic_pg_readpages, |
887 | }; | |
888 | ||
889 | static const struct nfs_pageio_ops bl_pg_write_ops = { | |
96c9eae6 PT |
890 | .pg_init = bl_pg_init_write, |
891 | .pg_test = bl_pg_test_write, | |
e9643fe8 BH |
892 | .pg_doio = pnfs_generic_pg_writepages, |
893 | }; | |
894 | ||
155e7524 FI |
895 | static struct pnfs_layoutdriver_type blocklayout_type = { |
896 | .id = LAYOUT_BLOCK_VOLUME, | |
897 | .name = "LAYOUT_BLOCK_VOLUME", | |
5a12cca6 | 898 | .owner = THIS_MODULE, |
3a6fd1f0 | 899 | .flags = PNFS_READ_WHOLE_PAGE, |
155e7524 FI |
900 | .read_pagelist = bl_read_pagelist, |
901 | .write_pagelist = bl_write_pagelist, | |
902 | .alloc_layout_hdr = bl_alloc_layout_hdr, | |
903 | .free_layout_hdr = bl_free_layout_hdr, | |
904 | .alloc_lseg = bl_alloc_lseg, | |
905 | .free_lseg = bl_free_lseg, | |
906 | .encode_layoutcommit = bl_encode_layoutcommit, | |
907 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, | |
908 | .set_layoutdriver = bl_set_layoutdriver, | |
909 | .clear_layoutdriver = bl_clear_layoutdriver, | |
e9643fe8 BH |
910 | .pg_read_ops = &bl_pg_read_ops, |
911 | .pg_write_ops = &bl_pg_write_ops, | |
155e7524 FI |
912 | }; |
913 | ||
fe0a9b74 | 914 | static const struct rpc_pipe_ops bl_upcall_ops = { |
c1225158 | 915 | .upcall = rpc_pipe_generic_upcall, |
fe0a9b74 JR |
916 | .downcall = bl_pipe_downcall, |
917 | .destroy_msg = bl_pipe_destroy_msg, | |
918 | }; | |
919 | ||
332dfab6 SK |
920 | static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, |
921 | struct rpc_pipe *pipe) | |
922 | { | |
923 | struct dentry *dir, *dentry; | |
924 | ||
925 | dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); | |
926 | if (dir == NULL) | |
927 | return ERR_PTR(-ENOENT); | |
928 | dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); | |
929 | dput(dir); | |
930 | return dentry; | |
931 | } | |
932 | ||
933 | static void nfs4blocklayout_unregister_sb(struct super_block *sb, | |
934 | struct rpc_pipe *pipe) | |
935 | { | |
936 | if (pipe->dentry) | |
937 | rpc_unlink(pipe->dentry); | |
938 | } | |
939 | ||
627f3066 SK |
940 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
941 | void *ptr) | |
942 | { | |
943 | struct super_block *sb = ptr; | |
944 | struct net *net = sb->s_fs_info; | |
945 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
946 | struct dentry *dentry; | |
947 | int ret = 0; | |
948 | ||
949 | if (!try_module_get(THIS_MODULE)) | |
950 | return 0; | |
951 | ||
952 | if (nn->bl_device_pipe == NULL) { | |
953 | module_put(THIS_MODULE); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | switch (event) { | |
958 | case RPC_PIPEFS_MOUNT: | |
959 | dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); | |
960 | if (IS_ERR(dentry)) { | |
961 | ret = PTR_ERR(dentry); | |
962 | break; | |
963 | } | |
964 | nn->bl_device_pipe->dentry = dentry; | |
965 | break; | |
966 | case RPC_PIPEFS_UMOUNT: | |
967 | if (nn->bl_device_pipe->dentry) | |
968 | nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); | |
969 | break; | |
970 | default: | |
971 | ret = -ENOTSUPP; | |
972 | break; | |
973 | } | |
974 | module_put(THIS_MODULE); | |
975 | return ret; | |
976 | } | |
977 | ||
978 | static struct notifier_block nfs4blocklayout_block = { | |
979 | .notifier_call = rpc_pipefs_event, | |
980 | }; | |
981 | ||
332dfab6 SK |
982 | static struct dentry *nfs4blocklayout_register_net(struct net *net, |
983 | struct rpc_pipe *pipe) | |
984 | { | |
985 | struct super_block *pipefs_sb; | |
986 | struct dentry *dentry; | |
987 | ||
988 | pipefs_sb = rpc_get_sb_net(net); | |
989 | if (!pipefs_sb) | |
2561d618 | 990 | return NULL; |
332dfab6 SK |
991 | dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); |
992 | rpc_put_sb_net(net); | |
993 | return dentry; | |
994 | } | |
995 | ||
996 | static void nfs4blocklayout_unregister_net(struct net *net, | |
997 | struct rpc_pipe *pipe) | |
998 | { | |
999 | struct super_block *pipefs_sb; | |
1000 | ||
1001 | pipefs_sb = rpc_get_sb_net(net); | |
1002 | if (pipefs_sb) { | |
1003 | nfs4blocklayout_unregister_sb(pipefs_sb, pipe); | |
1004 | rpc_put_sb_net(net); | |
1005 | } | |
1006 | } | |
1007 | ||
9e2e74db SK |
1008 | static int nfs4blocklayout_net_init(struct net *net) |
1009 | { | |
1010 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1011 | struct dentry *dentry; | |
1012 | ||
5ffaf855 | 1013 | init_waitqueue_head(&nn->bl_wq); |
9e2e74db SK |
1014 | nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); |
1015 | if (IS_ERR(nn->bl_device_pipe)) | |
1016 | return PTR_ERR(nn->bl_device_pipe); | |
1017 | dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); | |
1018 | if (IS_ERR(dentry)) { | |
1019 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
1020 | return PTR_ERR(dentry); | |
1021 | } | |
1022 | nn->bl_device_pipe->dentry = dentry; | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static void nfs4blocklayout_net_exit(struct net *net) | |
1027 | { | |
1028 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1029 | ||
1030 | nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); | |
1031 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
1032 | nn->bl_device_pipe = NULL; | |
1033 | } | |
1034 | ||
1035 | static struct pernet_operations nfs4blocklayout_net_ops = { | |
1036 | .init = nfs4blocklayout_net_init, | |
1037 | .exit = nfs4blocklayout_net_exit, | |
1038 | }; | |
1039 | ||
155e7524 FI |
1040 | static int __init nfs4blocklayout_init(void) |
1041 | { | |
1042 | int ret; | |
1043 | ||
1044 | dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); | |
1045 | ||
1046 | ret = pnfs_register_layoutdriver(&blocklayout_type); | |
fe0a9b74 JR |
1047 | if (ret) |
1048 | goto out; | |
1049 | ||
627f3066 | 1050 | ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); |
9e2e74db SK |
1051 | if (ret) |
1052 | goto out_remove; | |
627f3066 SK |
1053 | ret = register_pernet_subsys(&nfs4blocklayout_net_ops); |
1054 | if (ret) | |
1055 | goto out_notifier; | |
fe0a9b74 JR |
1056 | out: |
1057 | return ret; | |
1058 | ||
627f3066 SK |
1059 | out_notifier: |
1060 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); | |
fe0a9b74 JR |
1061 | out_remove: |
1062 | pnfs_unregister_layoutdriver(&blocklayout_type); | |
155e7524 FI |
1063 | return ret; |
1064 | } | |
1065 | ||
1066 | static void __exit nfs4blocklayout_exit(void) | |
1067 | { | |
1068 | dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", | |
1069 | __func__); | |
1070 | ||
627f3066 | 1071 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
9e2e74db | 1072 | unregister_pernet_subsys(&nfs4blocklayout_net_ops); |
155e7524 FI |
1073 | pnfs_unregister_layoutdriver(&blocklayout_type); |
1074 | } | |
1075 | ||
1076 | MODULE_ALIAS("nfs-layouttype4-3"); | |
1077 | ||
1078 | module_init(nfs4blocklayout_init); | |
1079 | module_exit(nfs4blocklayout_exit); |