Commit | Line | Data |
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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 JR |
42 | #include "../pnfs.h" |
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 | static void print_page(struct page *page) |
53 | { | |
54 | dprintk("PRINTPAGE page %p\n", page); | |
55 | dprintk(" PagePrivate %d\n", PagePrivate(page)); | |
56 | dprintk(" PageUptodate %d\n", PageUptodate(page)); | |
57 | dprintk(" PageError %d\n", PageError(page)); | |
58 | dprintk(" PageDirty %d\n", PageDirty(page)); | |
59 | dprintk(" PageReferenced %d\n", PageReferenced(page)); | |
60 | dprintk(" PageLocked %d\n", PageLocked(page)); | |
61 | dprintk(" PageWriteback %d\n", PageWriteback(page)); | |
62 | dprintk(" PageMappedToDisk %d\n", PageMappedToDisk(page)); | |
63 | dprintk("\n"); | |
64 | } | |
65 | ||
66 | /* Given the be associated with isect, determine if page data needs to be | |
67 | * initialized. | |
68 | */ | |
69 | static int is_hole(struct pnfs_block_extent *be, sector_t isect) | |
70 | { | |
71 | if (be->be_state == PNFS_BLOCK_NONE_DATA) | |
72 | return 1; | |
73 | else if (be->be_state != PNFS_BLOCK_INVALID_DATA) | |
74 | return 0; | |
75 | else | |
76 | return !bl_is_sector_init(be->be_inval, isect); | |
77 | } | |
78 | ||
650e2d39 FI |
79 | /* Given the be associated with isect, determine if page data can be |
80 | * written to disk. | |
81 | */ | |
82 | static int is_writable(struct pnfs_block_extent *be, sector_t isect) | |
83 | { | |
71cdd40f PT |
84 | return (be->be_state == PNFS_BLOCK_READWRITE_DATA || |
85 | be->be_state == PNFS_BLOCK_INVALID_DATA); | |
650e2d39 FI |
86 | } |
87 | ||
9549ec01 FI |
88 | /* The data we are handed might be spread across several bios. We need |
89 | * to track when the last one is finished. | |
90 | */ | |
91 | struct parallel_io { | |
92 | struct kref refcnt; | |
7c5465d6 | 93 | void (*pnfs_callback) (void *data, int num_se); |
9549ec01 | 94 | void *data; |
7c5465d6 | 95 | int bse_count; |
9549ec01 FI |
96 | }; |
97 | ||
98 | static inline struct parallel_io *alloc_parallel(void *data) | |
99 | { | |
100 | struct parallel_io *rv; | |
101 | ||
102 | rv = kmalloc(sizeof(*rv), GFP_NOFS); | |
103 | if (rv) { | |
104 | rv->data = data; | |
105 | kref_init(&rv->refcnt); | |
7c5465d6 | 106 | rv->bse_count = 0; |
9549ec01 FI |
107 | } |
108 | return rv; | |
109 | } | |
110 | ||
111 | static inline void get_parallel(struct parallel_io *p) | |
112 | { | |
113 | kref_get(&p->refcnt); | |
114 | } | |
115 | ||
116 | static void destroy_parallel(struct kref *kref) | |
117 | { | |
118 | struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); | |
119 | ||
120 | dprintk("%s enter\n", __func__); | |
7c5465d6 | 121 | p->pnfs_callback(p->data, p->bse_count); |
9549ec01 FI |
122 | kfree(p); |
123 | } | |
124 | ||
125 | static inline void put_parallel(struct parallel_io *p) | |
126 | { | |
127 | kref_put(&p->refcnt, destroy_parallel); | |
128 | } | |
129 | ||
130 | static struct bio * | |
131 | bl_submit_bio(int rw, struct bio *bio) | |
132 | { | |
133 | if (bio) { | |
134 | get_parallel(bio->bi_private); | |
135 | dprintk("%s submitting %s bio %u@%llu\n", __func__, | |
136 | rw == READ ? "read" : "write", | |
137 | bio->bi_size, (unsigned long long)bio->bi_sector); | |
138 | submit_bio(rw, bio); | |
139 | } | |
140 | return NULL; | |
141 | } | |
142 | ||
143 | static struct bio *bl_alloc_init_bio(int npg, sector_t isect, | |
144 | struct pnfs_block_extent *be, | |
145 | void (*end_io)(struct bio *, int err), | |
146 | struct parallel_io *par) | |
147 | { | |
148 | struct bio *bio; | |
149 | ||
74a6eeb4 | 150 | npg = min(npg, BIO_MAX_PAGES); |
9549ec01 | 151 | bio = bio_alloc(GFP_NOIO, npg); |
74a6eeb4 PT |
152 | if (!bio && (current->flags & PF_MEMALLOC)) { |
153 | while (!bio && (npg /= 2)) | |
154 | bio = bio_alloc(GFP_NOIO, npg); | |
155 | } | |
9549ec01 | 156 | |
74a6eeb4 PT |
157 | if (bio) { |
158 | bio->bi_sector = isect - be->be_f_offset + be->be_v_offset; | |
159 | bio->bi_bdev = be->be_mdev; | |
160 | bio->bi_end_io = end_io; | |
161 | bio->bi_private = par; | |
162 | } | |
9549ec01 FI |
163 | return bio; |
164 | } | |
165 | ||
fe6e1e8d | 166 | static struct bio *do_add_page_to_bio(struct bio *bio, int npg, int rw, |
9549ec01 FI |
167 | sector_t isect, struct page *page, |
168 | struct pnfs_block_extent *be, | |
169 | void (*end_io)(struct bio *, int err), | |
fe6e1e8d PT |
170 | struct parallel_io *par, |
171 | unsigned int offset, int len) | |
9549ec01 | 172 | { |
fe6e1e8d PT |
173 | isect = isect + (offset >> SECTOR_SHIFT); |
174 | dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, | |
175 | npg, rw, (unsigned long long)isect, offset, len); | |
9549ec01 FI |
176 | retry: |
177 | if (!bio) { | |
178 | bio = bl_alloc_init_bio(npg, isect, be, end_io, par); | |
179 | if (!bio) | |
180 | return ERR_PTR(-ENOMEM); | |
181 | } | |
fe6e1e8d | 182 | if (bio_add_page(bio, page, len, offset) < len) { |
9549ec01 FI |
183 | bio = bl_submit_bio(rw, bio); |
184 | goto retry; | |
185 | } | |
186 | return bio; | |
187 | } | |
188 | ||
fe6e1e8d PT |
189 | static struct bio *bl_add_page_to_bio(struct bio *bio, int npg, int rw, |
190 | sector_t isect, struct page *page, | |
191 | struct pnfs_block_extent *be, | |
192 | void (*end_io)(struct bio *, int err), | |
193 | struct parallel_io *par) | |
194 | { | |
195 | return do_add_page_to_bio(bio, npg, rw, isect, page, be, | |
196 | end_io, par, 0, PAGE_CACHE_SIZE); | |
197 | } | |
198 | ||
9549ec01 FI |
199 | /* This is basically copied from mpage_end_io_read */ |
200 | static void bl_end_io_read(struct bio *bio, int err) | |
201 | { | |
202 | struct parallel_io *par = bio->bi_private; | |
203 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
204 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
9549ec01 FI |
205 | |
206 | do { | |
207 | struct page *page = bvec->bv_page; | |
208 | ||
209 | if (--bvec >= bio->bi_io_vec) | |
210 | prefetchw(&bvec->bv_page->flags); | |
211 | if (uptodate) | |
212 | SetPageUptodate(page); | |
213 | } while (bvec >= bio->bi_io_vec); | |
214 | if (!uptodate) { | |
cd841605 FI |
215 | struct nfs_read_data *rdata = par->data; |
216 | struct nfs_pgio_header *header = rdata->header; | |
217 | ||
218 | if (!header->pnfs_error) | |
219 | header->pnfs_error = -EIO; | |
220 | pnfs_set_lo_fail(header->lseg); | |
9549ec01 FI |
221 | } |
222 | bio_put(bio); | |
223 | put_parallel(par); | |
224 | } | |
225 | ||
226 | static void bl_read_cleanup(struct work_struct *work) | |
227 | { | |
228 | struct rpc_task *task; | |
229 | struct nfs_read_data *rdata; | |
230 | dprintk("%s enter\n", __func__); | |
231 | task = container_of(work, struct rpc_task, u.tk_work); | |
232 | rdata = container_of(task, struct nfs_read_data, task); | |
233 | pnfs_ld_read_done(rdata); | |
234 | } | |
235 | ||
236 | static void | |
7c5465d6 | 237 | bl_end_par_io_read(void *data, int unused) |
9549ec01 FI |
238 | { |
239 | struct nfs_read_data *rdata = data; | |
240 | ||
cd841605 | 241 | rdata->task.tk_status = rdata->header->pnfs_error; |
9549ec01 FI |
242 | INIT_WORK(&rdata->task.u.tk_work, bl_read_cleanup); |
243 | schedule_work(&rdata->task.u.tk_work); | |
244 | } | |
245 | ||
155e7524 FI |
246 | static enum pnfs_try_status |
247 | bl_read_pagelist(struct nfs_read_data *rdata) | |
248 | { | |
cd841605 | 249 | struct nfs_pgio_header *header = rdata->header; |
9549ec01 FI |
250 | int i, hole; |
251 | struct bio *bio = NULL; | |
252 | struct pnfs_block_extent *be = NULL, *cow_read = NULL; | |
253 | sector_t isect, extent_length = 0; | |
254 | struct parallel_io *par; | |
255 | loff_t f_offset = rdata->args.offset; | |
f742dc4a PT |
256 | size_t bytes_left = rdata->args.count; |
257 | unsigned int pg_offset, pg_len; | |
9549ec01 FI |
258 | struct page **pages = rdata->args.pages; |
259 | int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT; | |
f742dc4a | 260 | const bool is_dio = (header->dreq != NULL); |
9549ec01 | 261 | |
6f00866d | 262 | dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, |
30dd374f | 263 | rdata->pages.npages, f_offset, (unsigned int)rdata->args.count); |
9549ec01 FI |
264 | |
265 | par = alloc_parallel(rdata); | |
266 | if (!par) | |
267 | goto use_mds; | |
9549ec01 FI |
268 | par->pnfs_callback = bl_end_par_io_read; |
269 | /* At this point, we can no longer jump to use_mds */ | |
270 | ||
271 | isect = (sector_t) (f_offset >> SECTOR_SHIFT); | |
272 | /* Code assumes extents are page-aligned */ | |
30dd374f | 273 | for (i = pg_index; i < rdata->pages.npages; i++) { |
9549ec01 FI |
274 | if (!extent_length) { |
275 | /* We've used up the previous extent */ | |
276 | bl_put_extent(be); | |
277 | bl_put_extent(cow_read); | |
278 | bio = bl_submit_bio(READ, bio); | |
279 | /* Get the next one */ | |
cd841605 | 280 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), |
9549ec01 FI |
281 | isect, &cow_read); |
282 | if (!be) { | |
cd841605 | 283 | header->pnfs_error = -EIO; |
9549ec01 FI |
284 | goto out; |
285 | } | |
286 | extent_length = be->be_length - | |
287 | (isect - be->be_f_offset); | |
288 | if (cow_read) { | |
289 | sector_t cow_length = cow_read->be_length - | |
290 | (isect - cow_read->be_f_offset); | |
291 | extent_length = min(extent_length, cow_length); | |
292 | } | |
293 | } | |
f742dc4a PT |
294 | |
295 | if (is_dio) { | |
296 | pg_offset = f_offset & ~PAGE_CACHE_MASK; | |
297 | if (pg_offset + bytes_left > PAGE_CACHE_SIZE) | |
298 | pg_len = PAGE_CACHE_SIZE - pg_offset; | |
299 | else | |
300 | pg_len = bytes_left; | |
301 | ||
302 | f_offset += pg_len; | |
303 | bytes_left -= pg_len; | |
304 | isect += (pg_offset >> SECTOR_SHIFT); | |
305 | } else { | |
306 | pg_offset = 0; | |
307 | pg_len = PAGE_CACHE_SIZE; | |
308 | } | |
309 | ||
9549ec01 FI |
310 | hole = is_hole(be, isect); |
311 | if (hole && !cow_read) { | |
312 | bio = bl_submit_bio(READ, bio); | |
313 | /* Fill hole w/ zeroes w/o accessing device */ | |
314 | dprintk("%s Zeroing page for hole\n", __func__); | |
f742dc4a | 315 | zero_user_segment(pages[i], pg_offset, pg_len); |
9549ec01 FI |
316 | print_page(pages[i]); |
317 | SetPageUptodate(pages[i]); | |
318 | } else { | |
319 | struct pnfs_block_extent *be_read; | |
320 | ||
321 | be_read = (hole && cow_read) ? cow_read : be; | |
f742dc4a | 322 | bio = do_add_page_to_bio(bio, rdata->pages.npages - i, |
30dd374f | 323 | READ, |
9549ec01 | 324 | isect, pages[i], be_read, |
f742dc4a PT |
325 | bl_end_io_read, par, |
326 | pg_offset, pg_len); | |
9549ec01 | 327 | if (IS_ERR(bio)) { |
cd841605 | 328 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 329 | bio = NULL; |
9549ec01 FI |
330 | goto out; |
331 | } | |
332 | } | |
f742dc4a | 333 | isect += (pg_len >> SECTOR_SHIFT); |
9549ec01 FI |
334 | extent_length -= PAGE_CACHE_SECTORS; |
335 | } | |
cd841605 | 336 | if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
9549ec01 | 337 | rdata->res.eof = 1; |
f742dc4a | 338 | rdata->res.count = header->inode->i_size - rdata->args.offset; |
9549ec01 | 339 | } else { |
f742dc4a | 340 | rdata->res.count = (isect << SECTOR_SHIFT) - rdata->args.offset; |
9549ec01 FI |
341 | } |
342 | out: | |
343 | bl_put_extent(be); | |
344 | bl_put_extent(cow_read); | |
345 | bl_submit_bio(READ, bio); | |
346 | put_parallel(par); | |
347 | return PNFS_ATTEMPTED; | |
348 | ||
349 | use_mds: | |
350 | dprintk("Giving up and using normal NFS\n"); | |
155e7524 FI |
351 | return PNFS_NOT_ATTEMPTED; |
352 | } | |
353 | ||
31e6306a FI |
354 | static void mark_extents_written(struct pnfs_block_layout *bl, |
355 | __u64 offset, __u32 count) | |
356 | { | |
357 | sector_t isect, end; | |
358 | struct pnfs_block_extent *be; | |
7c5465d6 | 359 | struct pnfs_block_short_extent *se; |
31e6306a FI |
360 | |
361 | dprintk("%s(%llu, %u)\n", __func__, offset, count); | |
362 | if (count == 0) | |
363 | return; | |
364 | isect = (offset & (long)(PAGE_CACHE_MASK)) >> SECTOR_SHIFT; | |
365 | end = (offset + count + PAGE_CACHE_SIZE - 1) & (long)(PAGE_CACHE_MASK); | |
366 | end >>= SECTOR_SHIFT; | |
367 | while (isect < end) { | |
368 | sector_t len; | |
369 | be = bl_find_get_extent(bl, isect, NULL); | |
370 | BUG_ON(!be); /* FIXME */ | |
371 | len = min(end, be->be_f_offset + be->be_length) - isect; | |
7c5465d6 PT |
372 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
373 | se = bl_pop_one_short_extent(be->be_inval); | |
374 | BUG_ON(!se); | |
375 | bl_mark_for_commit(be, isect, len, se); | |
376 | } | |
31e6306a FI |
377 | isect += len; |
378 | bl_put_extent(be); | |
379 | } | |
380 | } | |
381 | ||
71cdd40f PT |
382 | static void bl_end_io_write_zero(struct bio *bio, int err) |
383 | { | |
384 | struct parallel_io *par = bio->bi_private; | |
385 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
386 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
71cdd40f PT |
387 | |
388 | do { | |
389 | struct page *page = bvec->bv_page; | |
390 | ||
391 | if (--bvec >= bio->bi_io_vec) | |
392 | prefetchw(&bvec->bv_page->flags); | |
393 | /* This is the zeroing page we added */ | |
394 | end_page_writeback(page); | |
395 | page_cache_release(page); | |
396 | } while (bvec >= bio->bi_io_vec); | |
7c5465d6 PT |
397 | |
398 | if (unlikely(!uptodate)) { | |
cd841605 FI |
399 | struct nfs_write_data *data = par->data; |
400 | struct nfs_pgio_header *header = data->header; | |
401 | ||
402 | if (!header->pnfs_error) | |
403 | header->pnfs_error = -EIO; | |
404 | pnfs_set_lo_fail(header->lseg); | |
71cdd40f PT |
405 | } |
406 | bio_put(bio); | |
407 | put_parallel(par); | |
408 | } | |
409 | ||
650e2d39 FI |
410 | static void bl_end_io_write(struct bio *bio, int err) |
411 | { | |
412 | struct parallel_io *par = bio->bi_private; | |
413 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
cd841605 FI |
414 | struct nfs_write_data *data = par->data; |
415 | struct nfs_pgio_header *header = data->header; | |
650e2d39 FI |
416 | |
417 | if (!uptodate) { | |
cd841605 FI |
418 | if (!header->pnfs_error) |
419 | header->pnfs_error = -EIO; | |
420 | pnfs_set_lo_fail(header->lseg); | |
650e2d39 FI |
421 | } |
422 | bio_put(bio); | |
423 | put_parallel(par); | |
424 | } | |
425 | ||
426 | /* Function scheduled for call during bl_end_par_io_write, | |
427 | * it marks sectors as written and extends the commitlist. | |
428 | */ | |
429 | static void bl_write_cleanup(struct work_struct *work) | |
430 | { | |
431 | struct rpc_task *task; | |
432 | struct nfs_write_data *wdata; | |
433 | dprintk("%s enter\n", __func__); | |
434 | task = container_of(work, struct rpc_task, u.tk_work); | |
435 | wdata = container_of(task, struct nfs_write_data, task); | |
cd841605 | 436 | if (likely(!wdata->header->pnfs_error)) { |
31e6306a | 437 | /* Marks for LAYOUTCOMMIT */ |
cd841605 | 438 | mark_extents_written(BLK_LSEG2EXT(wdata->header->lseg), |
31e6306a FI |
439 | wdata->args.offset, wdata->args.count); |
440 | } | |
650e2d39 FI |
441 | pnfs_ld_write_done(wdata); |
442 | } | |
443 | ||
444 | /* Called when last of bios associated with a bl_write_pagelist call finishes */ | |
7c5465d6 | 445 | static void bl_end_par_io_write(void *data, int num_se) |
650e2d39 FI |
446 | { |
447 | struct nfs_write_data *wdata = data; | |
448 | ||
cd841605 FI |
449 | if (unlikely(wdata->header->pnfs_error)) { |
450 | bl_free_short_extents(&BLK_LSEG2EXT(wdata->header->lseg)->bl_inval, | |
7c5465d6 PT |
451 | num_se); |
452 | } | |
453 | ||
cd841605 | 454 | wdata->task.tk_status = wdata->header->pnfs_error; |
650e2d39 FI |
455 | wdata->verf.committed = NFS_FILE_SYNC; |
456 | INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup); | |
457 | schedule_work(&wdata->task.u.tk_work); | |
458 | } | |
459 | ||
71cdd40f PT |
460 | /* FIXME STUB - mark intersection of layout and page as bad, so is not |
461 | * used again. | |
462 | */ | |
463 | static void mark_bad_read(void) | |
464 | { | |
465 | return; | |
466 | } | |
467 | ||
468 | /* | |
469 | * map_block: map a requested I/0 block (isect) into an offset in the LVM | |
470 | * block_device | |
471 | */ | |
472 | static void | |
473 | map_block(struct buffer_head *bh, sector_t isect, struct pnfs_block_extent *be) | |
474 | { | |
475 | dprintk("%s enter be=%p\n", __func__, be); | |
476 | ||
477 | set_buffer_mapped(bh); | |
478 | bh->b_bdev = be->be_mdev; | |
479 | bh->b_blocknr = (isect - be->be_f_offset + be->be_v_offset) >> | |
480 | (be->be_mdev->bd_inode->i_blkbits - SECTOR_SHIFT); | |
481 | ||
482 | dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n", | |
483 | __func__, (unsigned long long)isect, (long)bh->b_blocknr, | |
484 | bh->b_size); | |
485 | return; | |
486 | } | |
487 | ||
fe6e1e8d PT |
488 | static void |
489 | bl_read_single_end_io(struct bio *bio, int error) | |
490 | { | |
491 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
492 | struct page *page = bvec->bv_page; | |
493 | ||
494 | /* Only one page in bvec */ | |
495 | unlock_page(page); | |
496 | } | |
497 | ||
498 | static int | |
499 | bl_do_readpage_sync(struct page *page, struct pnfs_block_extent *be, | |
500 | unsigned int offset, unsigned int len) | |
501 | { | |
502 | struct bio *bio; | |
503 | struct page *shadow_page; | |
504 | sector_t isect; | |
505 | char *kaddr, *kshadow_addr; | |
506 | int ret = 0; | |
507 | ||
508 | dprintk("%s: offset %u len %u\n", __func__, offset, len); | |
509 | ||
510 | shadow_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
511 | if (shadow_page == NULL) | |
512 | return -ENOMEM; | |
513 | ||
514 | bio = bio_alloc(GFP_NOIO, 1); | |
515 | if (bio == NULL) | |
516 | return -ENOMEM; | |
517 | ||
518 | isect = (page->index << PAGE_CACHE_SECTOR_SHIFT) + | |
519 | (offset / SECTOR_SIZE); | |
520 | ||
521 | bio->bi_sector = isect - be->be_f_offset + be->be_v_offset; | |
522 | bio->bi_bdev = be->be_mdev; | |
523 | bio->bi_end_io = bl_read_single_end_io; | |
524 | ||
525 | lock_page(shadow_page); | |
526 | if (bio_add_page(bio, shadow_page, | |
527 | SECTOR_SIZE, round_down(offset, SECTOR_SIZE)) == 0) { | |
528 | unlock_page(shadow_page); | |
529 | bio_put(bio); | |
530 | return -EIO; | |
531 | } | |
532 | ||
533 | submit_bio(READ, bio); | |
534 | wait_on_page_locked(shadow_page); | |
535 | if (unlikely(!test_bit(BIO_UPTODATE, &bio->bi_flags))) { | |
536 | ret = -EIO; | |
537 | } else { | |
538 | kaddr = kmap_atomic(page); | |
539 | kshadow_addr = kmap_atomic(shadow_page); | |
540 | memcpy(kaddr + offset, kshadow_addr + offset, len); | |
541 | kunmap_atomic(kshadow_addr); | |
542 | kunmap_atomic(kaddr); | |
543 | } | |
544 | __free_page(shadow_page); | |
545 | bio_put(bio); | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | static int | |
551 | bl_read_partial_page_sync(struct page *page, struct pnfs_block_extent *be, | |
552 | unsigned int dirty_offset, unsigned int dirty_len, | |
553 | bool full_page) | |
554 | { | |
555 | int ret = 0; | |
556 | unsigned int start, end; | |
557 | ||
558 | if (full_page) { | |
559 | start = 0; | |
560 | end = PAGE_CACHE_SIZE; | |
561 | } else { | |
562 | start = round_down(dirty_offset, SECTOR_SIZE); | |
563 | end = round_up(dirty_offset + dirty_len, SECTOR_SIZE); | |
564 | } | |
565 | ||
566 | dprintk("%s: offset %u len %d\n", __func__, dirty_offset, dirty_len); | |
567 | if (!be) { | |
568 | zero_user_segments(page, start, dirty_offset, | |
569 | dirty_offset + dirty_len, end); | |
570 | if (start == 0 && end == PAGE_CACHE_SIZE && | |
571 | trylock_page(page)) { | |
572 | SetPageUptodate(page); | |
573 | unlock_page(page); | |
574 | } | |
575 | return ret; | |
576 | } | |
577 | ||
578 | if (start != dirty_offset) | |
579 | ret = bl_do_readpage_sync(page, be, start, dirty_offset - start); | |
580 | ||
581 | if (!ret && (dirty_offset + dirty_len < end)) | |
582 | ret = bl_do_readpage_sync(page, be, dirty_offset + dirty_len, | |
583 | end - dirty_offset - dirty_len); | |
584 | ||
585 | return ret; | |
586 | } | |
587 | ||
71cdd40f PT |
588 | /* Given an unmapped page, zero it or read in page for COW, page is locked |
589 | * by caller. | |
590 | */ | |
591 | static int | |
592 | init_page_for_write(struct page *page, struct pnfs_block_extent *cow_read) | |
593 | { | |
594 | struct buffer_head *bh = NULL; | |
595 | int ret = 0; | |
596 | sector_t isect; | |
597 | ||
598 | dprintk("%s enter, %p\n", __func__, page); | |
599 | BUG_ON(PageUptodate(page)); | |
600 | if (!cow_read) { | |
601 | zero_user_segment(page, 0, PAGE_SIZE); | |
602 | SetPageUptodate(page); | |
603 | goto cleanup; | |
604 | } | |
605 | ||
606 | bh = alloc_page_buffers(page, PAGE_CACHE_SIZE, 0); | |
607 | if (!bh) { | |
608 | ret = -ENOMEM; | |
609 | goto cleanup; | |
610 | } | |
611 | ||
612 | isect = (sector_t) page->index << PAGE_CACHE_SECTOR_SHIFT; | |
613 | map_block(bh, isect, cow_read); | |
614 | if (!bh_uptodate_or_lock(bh)) | |
615 | ret = bh_submit_read(bh); | |
616 | if (ret) | |
617 | goto cleanup; | |
618 | SetPageUptodate(page); | |
619 | ||
620 | cleanup: | |
71cdd40f PT |
621 | if (bh) |
622 | free_buffer_head(bh); | |
623 | if (ret) { | |
624 | /* Need to mark layout with bad read...should now | |
625 | * just use nfs4 for reads and writes. | |
626 | */ | |
627 | mark_bad_read(); | |
628 | } | |
629 | return ret; | |
630 | } | |
631 | ||
72c50887 PT |
632 | /* Find or create a zeroing page marked being writeback. |
633 | * Return ERR_PTR on error, NULL to indicate skip this page and page itself | |
634 | * to indicate write out. | |
635 | */ | |
636 | static struct page * | |
637 | bl_find_get_zeroing_page(struct inode *inode, pgoff_t index, | |
638 | struct pnfs_block_extent *cow_read) | |
639 | { | |
640 | struct page *page; | |
641 | int locked = 0; | |
642 | page = find_get_page(inode->i_mapping, index); | |
643 | if (page) | |
644 | goto check_page; | |
645 | ||
646 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
647 | if (unlikely(!page)) { | |
648 | dprintk("%s oom\n", __func__); | |
649 | return ERR_PTR(-ENOMEM); | |
650 | } | |
651 | locked = 1; | |
652 | ||
653 | check_page: | |
654 | /* PageDirty: Other will write this out | |
655 | * PageWriteback: Other is writing this out | |
656 | * PageUptodate: It was read before | |
657 | */ | |
658 | if (PageDirty(page) || PageWriteback(page)) { | |
659 | print_page(page); | |
660 | if (locked) | |
661 | unlock_page(page); | |
662 | page_cache_release(page); | |
663 | return NULL; | |
664 | } | |
665 | ||
666 | if (!locked) { | |
667 | lock_page(page); | |
668 | locked = 1; | |
669 | goto check_page; | |
670 | } | |
671 | if (!PageUptodate(page)) { | |
672 | /* New page, readin or zero it */ | |
673 | init_page_for_write(page, cow_read); | |
674 | } | |
675 | set_page_writeback(page); | |
676 | unlock_page(page); | |
677 | ||
678 | return page; | |
679 | } | |
680 | ||
155e7524 | 681 | static enum pnfs_try_status |
650e2d39 | 682 | bl_write_pagelist(struct nfs_write_data *wdata, int sync) |
155e7524 | 683 | { |
cd841605 | 684 | struct nfs_pgio_header *header = wdata->header; |
71cdd40f | 685 | int i, ret, npg_zero, pg_index, last = 0; |
650e2d39 | 686 | struct bio *bio = NULL; |
71cdd40f PT |
687 | struct pnfs_block_extent *be = NULL, *cow_read = NULL; |
688 | sector_t isect, last_isect = 0, extent_length = 0; | |
96c9eae6 | 689 | struct parallel_io *par = NULL; |
650e2d39 FI |
690 | loff_t offset = wdata->args.offset; |
691 | size_t count = wdata->args.count; | |
fe6e1e8d | 692 | unsigned int pg_offset, pg_len, saved_len; |
650e2d39 | 693 | struct page **pages = wdata->args.pages; |
71cdd40f PT |
694 | struct page *page; |
695 | pgoff_t index; | |
696 | u64 temp; | |
697 | int npg_per_block = | |
cd841605 | 698 | NFS_SERVER(header->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT; |
650e2d39 FI |
699 | |
700 | dprintk("%s enter, %Zu@%lld\n", __func__, count, offset); | |
96c9eae6 PT |
701 | |
702 | if (header->dreq != NULL && | |
703 | (!IS_ALIGNED(offset, NFS_SERVER(header->inode)->pnfs_blksize) || | |
704 | !IS_ALIGNED(count, NFS_SERVER(header->inode)->pnfs_blksize))) { | |
705 | dprintk("pnfsblock nonblock aligned DIO writes. Resend MDS\n"); | |
706 | goto out_mds; | |
707 | } | |
650e2d39 | 708 | /* At this point, wdata->pages is a (sequential) list of nfs_pages. |
71cdd40f PT |
709 | * We want to write each, and if there is an error set pnfs_error |
710 | * to have it redone using nfs. | |
650e2d39 FI |
711 | */ |
712 | par = alloc_parallel(wdata); | |
713 | if (!par) | |
7c5465d6 | 714 | goto out_mds; |
650e2d39 FI |
715 | par->pnfs_callback = bl_end_par_io_write; |
716 | /* At this point, have to be more careful with error handling */ | |
717 | ||
718 | isect = (sector_t) ((offset & (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT); | |
cd841605 | 719 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), isect, &cow_read); |
71cdd40f PT |
720 | if (!be || !is_writable(be, isect)) { |
721 | dprintk("%s no matching extents!\n", __func__); | |
7c5465d6 | 722 | goto out_mds; |
71cdd40f PT |
723 | } |
724 | ||
725 | /* First page inside INVALID extent */ | |
726 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { | |
7c5465d6 PT |
727 | if (likely(!bl_push_one_short_extent(be->be_inval))) |
728 | par->bse_count++; | |
729 | else | |
730 | goto out_mds; | |
71cdd40f PT |
731 | temp = offset >> PAGE_CACHE_SHIFT; |
732 | npg_zero = do_div(temp, npg_per_block); | |
733 | isect = (sector_t) (((offset - npg_zero * PAGE_CACHE_SIZE) & | |
734 | (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT); | |
735 | extent_length = be->be_length - (isect - be->be_f_offset); | |
736 | ||
737 | fill_invalid_ext: | |
738 | dprintk("%s need to zero %d pages\n", __func__, npg_zero); | |
739 | for (;npg_zero > 0; npg_zero--) { | |
75422745 PT |
740 | if (bl_is_sector_init(be->be_inval, isect)) { |
741 | dprintk("isect %llu already init\n", | |
742 | (unsigned long long)isect); | |
743 | goto next_page; | |
744 | } | |
71cdd40f PT |
745 | /* page ref released in bl_end_io_write_zero */ |
746 | index = isect >> PAGE_CACHE_SECTOR_SHIFT; | |
747 | dprintk("%s zero %dth page: index %lu isect %llu\n", | |
748 | __func__, npg_zero, index, | |
749 | (unsigned long long)isect); | |
cd841605 | 750 | page = bl_find_get_zeroing_page(header->inode, index, |
72c50887 PT |
751 | cow_read); |
752 | if (unlikely(IS_ERR(page))) { | |
cd841605 | 753 | header->pnfs_error = PTR_ERR(page); |
71cdd40f | 754 | goto out; |
72c50887 | 755 | } else if (page == NULL) |
71cdd40f | 756 | goto next_page; |
71cdd40f PT |
757 | |
758 | ret = bl_mark_sectors_init(be->be_inval, isect, | |
60c52e3a | 759 | PAGE_CACHE_SECTORS); |
71cdd40f PT |
760 | if (unlikely(ret)) { |
761 | dprintk("%s bl_mark_sectors_init fail %d\n", | |
762 | __func__, ret); | |
763 | end_page_writeback(page); | |
764 | page_cache_release(page); | |
cd841605 | 765 | header->pnfs_error = ret; |
71cdd40f PT |
766 | goto out; |
767 | } | |
7c5465d6 PT |
768 | if (likely(!bl_push_one_short_extent(be->be_inval))) |
769 | par->bse_count++; | |
770 | else { | |
771 | end_page_writeback(page); | |
772 | page_cache_release(page); | |
cd841605 | 773 | header->pnfs_error = -ENOMEM; |
7c5465d6 PT |
774 | goto out; |
775 | } | |
776 | /* FIXME: This should be done in bi_end_io */ | |
cd841605 | 777 | mark_extents_written(BLK_LSEG2EXT(header->lseg), |
7c5465d6 PT |
778 | page->index << PAGE_CACHE_SHIFT, |
779 | PAGE_CACHE_SIZE); | |
780 | ||
71cdd40f PT |
781 | bio = bl_add_page_to_bio(bio, npg_zero, WRITE, |
782 | isect, page, be, | |
783 | bl_end_io_write_zero, par); | |
784 | if (IS_ERR(bio)) { | |
cd841605 | 785 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 786 | bio = NULL; |
71cdd40f PT |
787 | goto out; |
788 | } | |
71cdd40f PT |
789 | next_page: |
790 | isect += PAGE_CACHE_SECTORS; | |
791 | extent_length -= PAGE_CACHE_SECTORS; | |
792 | } | |
793 | if (last) | |
794 | goto write_done; | |
795 | } | |
796 | bio = bl_submit_bio(WRITE, bio); | |
797 | ||
798 | /* Middle pages */ | |
799 | pg_index = wdata->args.pgbase >> PAGE_CACHE_SHIFT; | |
30dd374f | 800 | for (i = pg_index; i < wdata->pages.npages; i++) { |
650e2d39 FI |
801 | if (!extent_length) { |
802 | /* We've used up the previous extent */ | |
803 | bl_put_extent(be); | |
fe6e1e8d | 804 | bl_put_extent(cow_read); |
650e2d39 FI |
805 | bio = bl_submit_bio(WRITE, bio); |
806 | /* Get the next one */ | |
cd841605 | 807 | be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), |
fe6e1e8d | 808 | isect, &cow_read); |
650e2d39 | 809 | if (!be || !is_writable(be, isect)) { |
cd841605 | 810 | header->pnfs_error = -EINVAL; |
650e2d39 FI |
811 | goto out; |
812 | } | |
7c5465d6 PT |
813 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
814 | if (likely(!bl_push_one_short_extent( | |
815 | be->be_inval))) | |
816 | par->bse_count++; | |
817 | else { | |
cd841605 | 818 | header->pnfs_error = -ENOMEM; |
7c5465d6 PT |
819 | goto out; |
820 | } | |
821 | } | |
650e2d39 | 822 | extent_length = be->be_length - |
71cdd40f | 823 | (isect - be->be_f_offset); |
650e2d39 | 824 | } |
fe6e1e8d PT |
825 | |
826 | dprintk("%s offset %lld count %Zu\n", __func__, offset, count); | |
827 | pg_offset = offset & ~PAGE_CACHE_MASK; | |
828 | if (pg_offset + count > PAGE_CACHE_SIZE) | |
829 | pg_len = PAGE_CACHE_SIZE - pg_offset; | |
830 | else | |
831 | pg_len = count; | |
832 | ||
833 | saved_len = pg_len; | |
834 | if (be->be_state == PNFS_BLOCK_INVALID_DATA && | |
835 | !bl_is_sector_init(be->be_inval, isect)) { | |
836 | ret = bl_read_partial_page_sync(pages[i], cow_read, | |
837 | pg_offset, pg_len, true); | |
838 | if (ret) { | |
839 | dprintk("%s bl_read_partial_page_sync fail %d\n", | |
840 | __func__, ret); | |
841 | header->pnfs_error = ret; | |
842 | goto out; | |
843 | } | |
844 | ||
71cdd40f | 845 | ret = bl_mark_sectors_init(be->be_inval, isect, |
60c52e3a | 846 | PAGE_CACHE_SECTORS); |
71cdd40f PT |
847 | if (unlikely(ret)) { |
848 | dprintk("%s bl_mark_sectors_init fail %d\n", | |
849 | __func__, ret); | |
cd841605 | 850 | header->pnfs_error = ret; |
71cdd40f | 851 | goto out; |
650e2d39 | 852 | } |
fe6e1e8d PT |
853 | |
854 | /* Expand to full page write */ | |
855 | pg_offset = 0; | |
856 | pg_len = PAGE_CACHE_SIZE; | |
857 | } else if ((pg_offset & (SECTOR_SIZE - 1)) || | |
858 | (pg_len & (SECTOR_SIZE - 1))){ | |
859 | /* ahh, nasty case. We have to do sync full sector | |
860 | * read-modify-write cycles. | |
861 | */ | |
862 | unsigned int saved_offset = pg_offset; | |
863 | ret = bl_read_partial_page_sync(pages[i], be, pg_offset, | |
864 | pg_len, false); | |
865 | pg_offset = round_down(pg_offset, SECTOR_SIZE); | |
866 | pg_len = round_up(saved_offset + pg_len, SECTOR_SIZE) | |
867 | - pg_offset; | |
71cdd40f | 868 | } |
fe6e1e8d PT |
869 | |
870 | ||
871 | bio = do_add_page_to_bio(bio, wdata->pages.npages - i, WRITE, | |
71cdd40f | 872 | isect, pages[i], be, |
fe6e1e8d PT |
873 | bl_end_io_write, par, |
874 | pg_offset, pg_len); | |
71cdd40f | 875 | if (IS_ERR(bio)) { |
cd841605 | 876 | header->pnfs_error = PTR_ERR(bio); |
e6d05a75 | 877 | bio = NULL; |
71cdd40f | 878 | goto out; |
650e2d39 | 879 | } |
fe6e1e8d PT |
880 | offset += saved_len; |
881 | count -= saved_len; | |
650e2d39 | 882 | isect += PAGE_CACHE_SECTORS; |
71cdd40f | 883 | last_isect = isect; |
650e2d39 FI |
884 | extent_length -= PAGE_CACHE_SECTORS; |
885 | } | |
71cdd40f PT |
886 | |
887 | /* Last page inside INVALID extent */ | |
888 | if (be->be_state == PNFS_BLOCK_INVALID_DATA) { | |
889 | bio = bl_submit_bio(WRITE, bio); | |
890 | temp = last_isect >> PAGE_CACHE_SECTOR_SHIFT; | |
891 | npg_zero = npg_per_block - do_div(temp, npg_per_block); | |
892 | if (npg_zero < npg_per_block) { | |
893 | last = 1; | |
894 | goto fill_invalid_ext; | |
895 | } | |
896 | } | |
897 | ||
898 | write_done: | |
fe6e1e8d | 899 | wdata->res.count = wdata->args.count; |
650e2d39 FI |
900 | out: |
901 | bl_put_extent(be); | |
fe6e1e8d | 902 | bl_put_extent(cow_read); |
650e2d39 FI |
903 | bl_submit_bio(WRITE, bio); |
904 | put_parallel(par); | |
905 | return PNFS_ATTEMPTED; | |
7c5465d6 PT |
906 | out_mds: |
907 | bl_put_extent(be); | |
fe6e1e8d | 908 | bl_put_extent(cow_read); |
7c5465d6 PT |
909 | kfree(par); |
910 | return PNFS_NOT_ATTEMPTED; | |
155e7524 FI |
911 | } |
912 | ||
9e692969 | 913 | /* FIXME - range ignored */ |
155e7524 | 914 | static void |
9e692969 | 915 | release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range) |
155e7524 | 916 | { |
9e692969 FI |
917 | int i; |
918 | struct pnfs_block_extent *be; | |
919 | ||
920 | spin_lock(&bl->bl_ext_lock); | |
921 | for (i = 0; i < EXTENT_LISTS; i++) { | |
922 | while (!list_empty(&bl->bl_extents[i])) { | |
923 | be = list_first_entry(&bl->bl_extents[i], | |
924 | struct pnfs_block_extent, | |
925 | be_node); | |
926 | list_del(&be->be_node); | |
927 | bl_put_extent(be); | |
928 | } | |
929 | } | |
930 | spin_unlock(&bl->bl_ext_lock); | |
155e7524 FI |
931 | } |
932 | ||
155e7524 FI |
933 | static void |
934 | release_inval_marks(struct pnfs_inval_markings *marks) | |
935 | { | |
c1c2a4cd | 936 | struct pnfs_inval_tracking *pos, *temp; |
7c5465d6 | 937 | struct pnfs_block_short_extent *se, *stemp; |
c1c2a4cd FI |
938 | |
939 | list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) { | |
940 | list_del(&pos->it_link); | |
941 | kfree(pos); | |
942 | } | |
7c5465d6 PT |
943 | |
944 | list_for_each_entry_safe(se, stemp, &marks->im_extents, bse_node) { | |
945 | list_del(&se->bse_node); | |
946 | kfree(se); | |
947 | } | |
155e7524 FI |
948 | return; |
949 | } | |
950 | ||
951 | static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
952 | { | |
953 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); | |
954 | ||
955 | dprintk("%s enter\n", __func__); | |
956 | release_extents(bl, NULL); | |
957 | release_inval_marks(&bl->bl_inval); | |
958 | kfree(bl); | |
959 | } | |
960 | ||
961 | static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, | |
962 | gfp_t gfp_flags) | |
963 | { | |
964 | struct pnfs_block_layout *bl; | |
965 | ||
966 | dprintk("%s enter\n", __func__); | |
967 | bl = kzalloc(sizeof(*bl), gfp_flags); | |
968 | if (!bl) | |
969 | return NULL; | |
970 | spin_lock_init(&bl->bl_ext_lock); | |
971 | INIT_LIST_HEAD(&bl->bl_extents[0]); | |
972 | INIT_LIST_HEAD(&bl->bl_extents[1]); | |
973 | INIT_LIST_HEAD(&bl->bl_commit); | |
974 | INIT_LIST_HEAD(&bl->bl_committing); | |
975 | bl->bl_count = 0; | |
976 | bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT; | |
977 | BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize); | |
978 | return &bl->bl_layout; | |
979 | } | |
980 | ||
a60d2ebd | 981 | static void bl_free_lseg(struct pnfs_layout_segment *lseg) |
155e7524 | 982 | { |
a60d2ebd FI |
983 | dprintk("%s enter\n", __func__); |
984 | kfree(lseg); | |
155e7524 FI |
985 | } |
986 | ||
a60d2ebd FI |
987 | /* We pretty much ignore lseg, and store all data layout wide, so we |
988 | * can correctly merge. | |
989 | */ | |
990 | static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo, | |
991 | struct nfs4_layoutget_res *lgr, | |
992 | gfp_t gfp_flags) | |
155e7524 | 993 | { |
a60d2ebd FI |
994 | struct pnfs_layout_segment *lseg; |
995 | int status; | |
996 | ||
997 | dprintk("%s enter\n", __func__); | |
998 | lseg = kzalloc(sizeof(*lseg), gfp_flags); | |
999 | if (!lseg) | |
1000 | return ERR_PTR(-ENOMEM); | |
1001 | status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags); | |
1002 | if (status) { | |
1003 | /* We don't want to call the full-blown bl_free_lseg, | |
1004 | * since on error extents were not touched. | |
1005 | */ | |
1006 | kfree(lseg); | |
1007 | return ERR_PTR(status); | |
1008 | } | |
1009 | return lseg; | |
155e7524 FI |
1010 | } |
1011 | ||
1012 | static void | |
1013 | bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr, | |
1014 | const struct nfs4_layoutcommit_args *arg) | |
1015 | { | |
90ace12a FI |
1016 | dprintk("%s enter\n", __func__); |
1017 | encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo), xdr, arg); | |
155e7524 FI |
1018 | } |
1019 | ||
1020 | static void | |
1021 | bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) | |
1022 | { | |
b2be7811 FI |
1023 | struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout; |
1024 | ||
1025 | dprintk("%s enter\n", __func__); | |
1026 | clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo), &lcdata->args, lcdata->res.status); | |
155e7524 FI |
1027 | } |
1028 | ||
2f9fd182 FI |
1029 | static void free_blk_mountid(struct block_mount_id *mid) |
1030 | { | |
1031 | if (mid) { | |
93a3844e PT |
1032 | struct pnfs_block_dev *dev, *tmp; |
1033 | ||
1034 | /* No need to take bm_lock as we are last user freeing bm_devlist */ | |
1035 | list_for_each_entry_safe(dev, tmp, &mid->bm_devlist, bm_node) { | |
2f9fd182 FI |
1036 | list_del(&dev->bm_node); |
1037 | bl_free_block_dev(dev); | |
1038 | } | |
2f9fd182 FI |
1039 | kfree(mid); |
1040 | } | |
1041 | } | |
1042 | ||
78e4e05c | 1043 | /* This is mostly copied from the filelayout_get_device_info function. |
2f9fd182 FI |
1044 | * It seems much of this should be at the generic pnfs level. |
1045 | */ | |
1046 | static struct pnfs_block_dev * | |
1047 | nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh, | |
1048 | struct nfs4_deviceid *d_id) | |
1049 | { | |
1050 | struct pnfs_device *dev; | |
516f2e24 | 1051 | struct pnfs_block_dev *rv; |
2f9fd182 FI |
1052 | u32 max_resp_sz; |
1053 | int max_pages; | |
1054 | struct page **pages = NULL; | |
1055 | int i, rc; | |
1056 | ||
1057 | /* | |
1058 | * Use the session max response size as the basis for setting | |
1059 | * GETDEVICEINFO's maxcount | |
1060 | */ | |
1061 | max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; | |
10bd295a | 1062 | max_pages = nfs_page_array_len(0, max_resp_sz); |
2f9fd182 FI |
1063 | dprintk("%s max_resp_sz %u max_pages %d\n", |
1064 | __func__, max_resp_sz, max_pages); | |
1065 | ||
1066 | dev = kmalloc(sizeof(*dev), GFP_NOFS); | |
1067 | if (!dev) { | |
1068 | dprintk("%s kmalloc failed\n", __func__); | |
516f2e24 | 1069 | return ERR_PTR(-ENOMEM); |
2f9fd182 FI |
1070 | } |
1071 | ||
1072 | pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS); | |
1073 | if (pages == NULL) { | |
1074 | kfree(dev); | |
516f2e24 | 1075 | return ERR_PTR(-ENOMEM); |
2f9fd182 FI |
1076 | } |
1077 | for (i = 0; i < max_pages; i++) { | |
1078 | pages[i] = alloc_page(GFP_NOFS); | |
516f2e24 JR |
1079 | if (!pages[i]) { |
1080 | rv = ERR_PTR(-ENOMEM); | |
2f9fd182 | 1081 | goto out_free; |
516f2e24 | 1082 | } |
2f9fd182 FI |
1083 | } |
1084 | ||
1085 | memcpy(&dev->dev_id, d_id, sizeof(*d_id)); | |
1086 | dev->layout_type = LAYOUT_BLOCK_VOLUME; | |
1087 | dev->pages = pages; | |
1088 | dev->pgbase = 0; | |
1089 | dev->pglen = PAGE_SIZE * max_pages; | |
1090 | dev->mincount = 0; | |
1091 | ||
1092 | dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data); | |
1093 | rc = nfs4_proc_getdeviceinfo(server, dev); | |
1094 | dprintk("%s getdevice info returns %d\n", __func__, rc); | |
516f2e24 JR |
1095 | if (rc) { |
1096 | rv = ERR_PTR(rc); | |
2f9fd182 | 1097 | goto out_free; |
516f2e24 | 1098 | } |
2f9fd182 FI |
1099 | |
1100 | rv = nfs4_blk_decode_device(server, dev); | |
1101 | out_free: | |
1102 | for (i = 0; i < max_pages; i++) | |
1103 | __free_page(pages[i]); | |
1104 | kfree(pages); | |
1105 | kfree(dev); | |
1106 | return rv; | |
1107 | } | |
1108 | ||
155e7524 FI |
1109 | static int |
1110 | bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) | |
1111 | { | |
2f9fd182 FI |
1112 | struct block_mount_id *b_mt_id = NULL; |
1113 | struct pnfs_devicelist *dlist = NULL; | |
1114 | struct pnfs_block_dev *bdev; | |
1115 | LIST_HEAD(block_disklist); | |
516f2e24 | 1116 | int status, i; |
2f9fd182 | 1117 | |
155e7524 | 1118 | dprintk("%s enter\n", __func__); |
2f9fd182 FI |
1119 | |
1120 | if (server->pnfs_blksize == 0) { | |
1121 | dprintk("%s Server did not return blksize\n", __func__); | |
1122 | return -EINVAL; | |
1123 | } | |
1124 | b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS); | |
1125 | if (!b_mt_id) { | |
1126 | status = -ENOMEM; | |
1127 | goto out_error; | |
1128 | } | |
1129 | /* Initialize nfs4 block layout mount id */ | |
1130 | spin_lock_init(&b_mt_id->bm_lock); | |
1131 | INIT_LIST_HEAD(&b_mt_id->bm_devlist); | |
1132 | ||
1133 | dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS); | |
1134 | if (!dlist) { | |
1135 | status = -ENOMEM; | |
1136 | goto out_error; | |
1137 | } | |
1138 | dlist->eof = 0; | |
1139 | while (!dlist->eof) { | |
1140 | status = nfs4_proc_getdevicelist(server, fh, dlist); | |
1141 | if (status) | |
1142 | goto out_error; | |
1143 | dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n", | |
1144 | __func__, dlist->num_devs, dlist->eof); | |
1145 | for (i = 0; i < dlist->num_devs; i++) { | |
1146 | bdev = nfs4_blk_get_deviceinfo(server, fh, | |
1147 | &dlist->dev_id[i]); | |
516f2e24 JR |
1148 | if (IS_ERR(bdev)) { |
1149 | status = PTR_ERR(bdev); | |
2f9fd182 FI |
1150 | goto out_error; |
1151 | } | |
1152 | spin_lock(&b_mt_id->bm_lock); | |
1153 | list_add(&bdev->bm_node, &b_mt_id->bm_devlist); | |
1154 | spin_unlock(&b_mt_id->bm_lock); | |
1155 | } | |
1156 | } | |
1157 | dprintk("%s SUCCESS\n", __func__); | |
1158 | server->pnfs_ld_data = b_mt_id; | |
1159 | ||
1160 | out_return: | |
1161 | kfree(dlist); | |
1162 | return status; | |
1163 | ||
1164 | out_error: | |
1165 | free_blk_mountid(b_mt_id); | |
1166 | goto out_return; | |
155e7524 FI |
1167 | } |
1168 | ||
1169 | static int | |
1170 | bl_clear_layoutdriver(struct nfs_server *server) | |
1171 | { | |
2f9fd182 FI |
1172 | struct block_mount_id *b_mt_id = server->pnfs_ld_data; |
1173 | ||
155e7524 | 1174 | dprintk("%s enter\n", __func__); |
2f9fd182 FI |
1175 | free_blk_mountid(b_mt_id); |
1176 | dprintk("%s RETURNS\n", __func__); | |
155e7524 FI |
1177 | return 0; |
1178 | } | |
1179 | ||
f742dc4a PT |
1180 | static bool |
1181 | is_aligned_req(struct nfs_page *req, unsigned int alignment) | |
1182 | { | |
1183 | return IS_ALIGNED(req->wb_offset, alignment) && | |
1184 | IS_ALIGNED(req->wb_bytes, alignment); | |
1185 | } | |
1186 | ||
1187 | static void | |
1188 | bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) | |
1189 | { | |
1190 | if (pgio->pg_dreq != NULL && | |
1191 | !is_aligned_req(req, SECTOR_SIZE)) | |
1192 | nfs_pageio_reset_read_mds(pgio); | |
1193 | else | |
1194 | pnfs_generic_pg_init_read(pgio, req); | |
1195 | } | |
1196 | ||
1197 | static bool | |
1198 | bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, | |
1199 | struct nfs_page *req) | |
1200 | { | |
1201 | if (pgio->pg_dreq != NULL && | |
1202 | !is_aligned_req(req, SECTOR_SIZE)) | |
1203 | return false; | |
1204 | ||
1205 | return pnfs_generic_pg_test(pgio, prev, req); | |
1206 | } | |
1207 | ||
6296556f PT |
1208 | /* |
1209 | * Return the number of contiguous bytes for a given inode | |
1210 | * starting at page frame idx. | |
1211 | */ | |
1212 | static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) | |
1213 | { | |
1214 | struct address_space *mapping = inode->i_mapping; | |
1215 | pgoff_t end; | |
1216 | ||
1217 | /* Optimize common case that writes from 0 to end of file */ | |
1218 | end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE); | |
1219 | if (end != NFS_I(inode)->npages) { | |
1220 | rcu_read_lock(); | |
1221 | end = radix_tree_next_hole(&mapping->page_tree, idx + 1, ULONG_MAX); | |
1222 | rcu_read_unlock(); | |
1223 | } | |
1224 | ||
1225 | if (!end) | |
1226 | return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT); | |
1227 | else | |
1228 | return (end - idx) << PAGE_CACHE_SHIFT; | |
1229 | } | |
1230 | ||
6f018efa | 1231 | static void |
96c9eae6 PT |
1232 | bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
1233 | { | |
1234 | if (pgio->pg_dreq != NULL && | |
6296556f | 1235 | !is_aligned_req(req, PAGE_CACHE_SIZE)) { |
96c9eae6 | 1236 | nfs_pageio_reset_write_mds(pgio); |
6296556f PT |
1237 | } else { |
1238 | u64 wb_size; | |
1239 | if (pgio->pg_dreq == NULL) | |
1240 | wb_size = pnfs_num_cont_bytes(pgio->pg_inode, | |
1241 | req->wb_index); | |
1242 | else | |
1243 | wb_size = nfs_dreq_bytes_left(pgio->pg_dreq); | |
1244 | ||
1245 | pnfs_generic_pg_init_write(pgio, req, wb_size); | |
1246 | } | |
96c9eae6 PT |
1247 | } |
1248 | ||
1249 | static bool | |
1250 | bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, | |
1251 | struct nfs_page *req) | |
1252 | { | |
1253 | if (pgio->pg_dreq != NULL && | |
1254 | !is_aligned_req(req, PAGE_CACHE_SIZE)) | |
1255 | return false; | |
1256 | ||
1257 | return pnfs_generic_pg_test(pgio, prev, req); | |
1258 | } | |
1259 | ||
e9643fe8 | 1260 | static const struct nfs_pageio_ops bl_pg_read_ops = { |
f742dc4a PT |
1261 | .pg_init = bl_pg_init_read, |
1262 | .pg_test = bl_pg_test_read, | |
e9643fe8 BH |
1263 | .pg_doio = pnfs_generic_pg_readpages, |
1264 | }; | |
1265 | ||
1266 | static const struct nfs_pageio_ops bl_pg_write_ops = { | |
96c9eae6 PT |
1267 | .pg_init = bl_pg_init_write, |
1268 | .pg_test = bl_pg_test_write, | |
e9643fe8 BH |
1269 | .pg_doio = pnfs_generic_pg_writepages, |
1270 | }; | |
1271 | ||
155e7524 FI |
1272 | static struct pnfs_layoutdriver_type blocklayout_type = { |
1273 | .id = LAYOUT_BLOCK_VOLUME, | |
1274 | .name = "LAYOUT_BLOCK_VOLUME", | |
1275 | .read_pagelist = bl_read_pagelist, | |
1276 | .write_pagelist = bl_write_pagelist, | |
1277 | .alloc_layout_hdr = bl_alloc_layout_hdr, | |
1278 | .free_layout_hdr = bl_free_layout_hdr, | |
1279 | .alloc_lseg = bl_alloc_lseg, | |
1280 | .free_lseg = bl_free_lseg, | |
1281 | .encode_layoutcommit = bl_encode_layoutcommit, | |
1282 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, | |
1283 | .set_layoutdriver = bl_set_layoutdriver, | |
1284 | .clear_layoutdriver = bl_clear_layoutdriver, | |
e9643fe8 BH |
1285 | .pg_read_ops = &bl_pg_read_ops, |
1286 | .pg_write_ops = &bl_pg_write_ops, | |
155e7524 FI |
1287 | }; |
1288 | ||
fe0a9b74 | 1289 | static const struct rpc_pipe_ops bl_upcall_ops = { |
c1225158 | 1290 | .upcall = rpc_pipe_generic_upcall, |
fe0a9b74 JR |
1291 | .downcall = bl_pipe_downcall, |
1292 | .destroy_msg = bl_pipe_destroy_msg, | |
1293 | }; | |
1294 | ||
332dfab6 SK |
1295 | static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, |
1296 | struct rpc_pipe *pipe) | |
1297 | { | |
1298 | struct dentry *dir, *dentry; | |
1299 | ||
1300 | dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); | |
1301 | if (dir == NULL) | |
1302 | return ERR_PTR(-ENOENT); | |
1303 | dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); | |
1304 | dput(dir); | |
1305 | return dentry; | |
1306 | } | |
1307 | ||
1308 | static void nfs4blocklayout_unregister_sb(struct super_block *sb, | |
1309 | struct rpc_pipe *pipe) | |
1310 | { | |
1311 | if (pipe->dentry) | |
1312 | rpc_unlink(pipe->dentry); | |
1313 | } | |
1314 | ||
627f3066 SK |
1315 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
1316 | void *ptr) | |
1317 | { | |
1318 | struct super_block *sb = ptr; | |
1319 | struct net *net = sb->s_fs_info; | |
1320 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1321 | struct dentry *dentry; | |
1322 | int ret = 0; | |
1323 | ||
1324 | if (!try_module_get(THIS_MODULE)) | |
1325 | return 0; | |
1326 | ||
1327 | if (nn->bl_device_pipe == NULL) { | |
1328 | module_put(THIS_MODULE); | |
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | switch (event) { | |
1333 | case RPC_PIPEFS_MOUNT: | |
1334 | dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); | |
1335 | if (IS_ERR(dentry)) { | |
1336 | ret = PTR_ERR(dentry); | |
1337 | break; | |
1338 | } | |
1339 | nn->bl_device_pipe->dentry = dentry; | |
1340 | break; | |
1341 | case RPC_PIPEFS_UMOUNT: | |
1342 | if (nn->bl_device_pipe->dentry) | |
1343 | nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); | |
1344 | break; | |
1345 | default: | |
1346 | ret = -ENOTSUPP; | |
1347 | break; | |
1348 | } | |
1349 | module_put(THIS_MODULE); | |
1350 | return ret; | |
1351 | } | |
1352 | ||
1353 | static struct notifier_block nfs4blocklayout_block = { | |
1354 | .notifier_call = rpc_pipefs_event, | |
1355 | }; | |
1356 | ||
332dfab6 SK |
1357 | static struct dentry *nfs4blocklayout_register_net(struct net *net, |
1358 | struct rpc_pipe *pipe) | |
1359 | { | |
1360 | struct super_block *pipefs_sb; | |
1361 | struct dentry *dentry; | |
1362 | ||
1363 | pipefs_sb = rpc_get_sb_net(net); | |
1364 | if (!pipefs_sb) | |
2561d618 | 1365 | return NULL; |
332dfab6 SK |
1366 | dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); |
1367 | rpc_put_sb_net(net); | |
1368 | return dentry; | |
1369 | } | |
1370 | ||
1371 | static void nfs4blocklayout_unregister_net(struct net *net, | |
1372 | struct rpc_pipe *pipe) | |
1373 | { | |
1374 | struct super_block *pipefs_sb; | |
1375 | ||
1376 | pipefs_sb = rpc_get_sb_net(net); | |
1377 | if (pipefs_sb) { | |
1378 | nfs4blocklayout_unregister_sb(pipefs_sb, pipe); | |
1379 | rpc_put_sb_net(net); | |
1380 | } | |
1381 | } | |
1382 | ||
9e2e74db SK |
1383 | static int nfs4blocklayout_net_init(struct net *net) |
1384 | { | |
1385 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1386 | struct dentry *dentry; | |
1387 | ||
5ffaf855 | 1388 | init_waitqueue_head(&nn->bl_wq); |
9e2e74db SK |
1389 | nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); |
1390 | if (IS_ERR(nn->bl_device_pipe)) | |
1391 | return PTR_ERR(nn->bl_device_pipe); | |
1392 | dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); | |
1393 | if (IS_ERR(dentry)) { | |
1394 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
1395 | return PTR_ERR(dentry); | |
1396 | } | |
1397 | nn->bl_device_pipe->dentry = dentry; | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | static void nfs4blocklayout_net_exit(struct net *net) | |
1402 | { | |
1403 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
1404 | ||
1405 | nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); | |
1406 | rpc_destroy_pipe_data(nn->bl_device_pipe); | |
1407 | nn->bl_device_pipe = NULL; | |
1408 | } | |
1409 | ||
1410 | static struct pernet_operations nfs4blocklayout_net_ops = { | |
1411 | .init = nfs4blocklayout_net_init, | |
1412 | .exit = nfs4blocklayout_net_exit, | |
1413 | }; | |
1414 | ||
155e7524 FI |
1415 | static int __init nfs4blocklayout_init(void) |
1416 | { | |
1417 | int ret; | |
1418 | ||
1419 | dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); | |
1420 | ||
1421 | ret = pnfs_register_layoutdriver(&blocklayout_type); | |
fe0a9b74 JR |
1422 | if (ret) |
1423 | goto out; | |
1424 | ||
627f3066 | 1425 | ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); |
9e2e74db SK |
1426 | if (ret) |
1427 | goto out_remove; | |
627f3066 SK |
1428 | ret = register_pernet_subsys(&nfs4blocklayout_net_ops); |
1429 | if (ret) | |
1430 | goto out_notifier; | |
fe0a9b74 JR |
1431 | out: |
1432 | return ret; | |
1433 | ||
627f3066 SK |
1434 | out_notifier: |
1435 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); | |
fe0a9b74 JR |
1436 | out_remove: |
1437 | pnfs_unregister_layoutdriver(&blocklayout_type); | |
155e7524 FI |
1438 | return ret; |
1439 | } | |
1440 | ||
1441 | static void __exit nfs4blocklayout_exit(void) | |
1442 | { | |
1443 | dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", | |
1444 | __func__); | |
1445 | ||
627f3066 | 1446 | rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
9e2e74db | 1447 | unregister_pernet_subsys(&nfs4blocklayout_net_ops); |
155e7524 FI |
1448 | pnfs_unregister_layoutdriver(&blocklayout_type); |
1449 | } | |
1450 | ||
1451 | MODULE_ALIAS("nfs-layouttype4-3"); | |
1452 | ||
1453 | module_init(nfs4blocklayout_init); | |
1454 | module_exit(nfs4blocklayout_exit); |