Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/nfs/read.c | |
4 | * | |
5 | * Block I/O for NFS | |
6 | * | |
7 | * Partial copy of Linus' read cache modifications to fs/nfs/file.c | |
8 | * modified for async RPC by okir@monad.swb.de | |
1da177e4 LT |
9 | */ |
10 | ||
1da177e4 LT |
11 | #include <linux/time.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/fcntl.h> | |
15 | #include <linux/stat.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/slab.h> | |
9c88ea00 | 18 | #include <linux/task_io_accounting_ops.h> |
1da177e4 LT |
19 | #include <linux/pagemap.h> |
20 | #include <linux/sunrpc/clnt.h> | |
21 | #include <linux/nfs_fs.h> | |
22 | #include <linux/nfs_page.h> | |
64419a9b | 23 | #include <linux/module.h> |
1da177e4 | 24 | |
f11c88af | 25 | #include "nfs4_fs.h" |
49a70f27 | 26 | #include "internal.h" |
91d5b470 | 27 | #include "iostat.h" |
9a9fc1c0 | 28 | #include "fscache.h" |
fab5fc25 | 29 | #include "pnfs.h" |
8224b273 | 30 | #include "nfstrace.h" |
91d5b470 | 31 | |
1da177e4 LT |
32 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
33 | ||
000dbe0b | 34 | const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; |
4a0de55c | 35 | static const struct nfs_rw_ops nfs_rw_read_ops; |
1da177e4 | 36 | |
e18b890b | 37 | static struct kmem_cache *nfs_rdata_cachep; |
1da177e4 | 38 | |
1e7f3a48 | 39 | static struct nfs_pgio_header *nfs_readhdr_alloc(void) |
3feb2d49 | 40 | { |
fbe77c30 BC |
41 | struct nfs_pgio_header *p = kmem_cache_zalloc(nfs_rdata_cachep, GFP_KERNEL); |
42 | ||
43 | if (p) | |
44 | p->rw_mode = FMODE_READ; | |
45 | return p; | |
4db6e0b7 FI |
46 | } |
47 | ||
1e7f3a48 | 48 | static void nfs_readhdr_free(struct nfs_pgio_header *rhdr) |
3feb2d49 | 49 | { |
303a7805 AS |
50 | if (rhdr->res.scratch != NULL) |
51 | kfree(rhdr->res.scratch); | |
cd841605 | 52 | kmem_cache_free(nfs_rdata_cachep, rhdr); |
3feb2d49 TM |
53 | } |
54 | ||
ab75bff1 | 55 | static int nfs_return_empty_folio(struct folio *folio) |
1da177e4 | 56 | { |
ab75bff1 TM |
57 | folio_zero_segment(folio, 0, folio_size(folio)); |
58 | folio_mark_uptodate(folio); | |
59 | folio_unlock(folio); | |
1da177e4 LT |
60 | return 0; |
61 | } | |
62 | ||
1abb5088 | 63 | void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, |
fab5fc25 | 64 | struct inode *inode, bool force_mds, |
061ae2ed | 65 | const struct nfs_pgio_completion_ops *compl_ops) |
1751c363 | 66 | { |
fab5fc25 | 67 | struct nfs_server *server = NFS_SERVER(inode); |
41d8d5b7 | 68 | const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; |
fab5fc25 CH |
69 | |
70 | #ifdef CONFIG_NFS_V4_1 | |
71 | if (server->pnfs_curr_ld && !force_mds) | |
72 | pg_ops = server->pnfs_curr_ld->pg_read_ops; | |
73 | #endif | |
4a0de55c | 74 | nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_read_ops, |
3bde7afd | 75 | server->rsize, 0); |
1751c363 | 76 | } |
ddda8e0a | 77 | EXPORT_SYMBOL_GPL(nfs_pageio_init_read); |
1751c363 | 78 | |
000dbe0b | 79 | void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio) |
1e83b173 DW |
80 | { |
81 | struct nfs_pgio_mirror *pgm; | |
82 | unsigned long npages; | |
83 | ||
84 | nfs_pageio_complete(pgio); | |
85 | ||
86 | /* It doesn't make sense to do mirrored reads! */ | |
87 | WARN_ON_ONCE(pgio->pg_mirror_count != 1); | |
88 | ||
89 | pgm = &pgio->pg_mirrors[0]; | |
b42ad64f | 90 | NFS_I(pgio->pg_inode)->read_io += pgm->pg_bytes_written; |
1e83b173 | 91 | npages = (pgm->pg_bytes_written + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b42ad64f | 92 | nfs_add_stats(pgio->pg_inode, NFSIOS_READPAGES, npages); |
1e83b173 DW |
93 | } |
94 | ||
95 | ||
493292dd TM |
96 | void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio) |
97 | { | |
a7d42ddb WAA |
98 | struct nfs_pgio_mirror *mirror; |
99 | ||
6f29b9bb KM |
100 | if (pgio->pg_ops && pgio->pg_ops->pg_cleanup) |
101 | pgio->pg_ops->pg_cleanup(pgio); | |
102 | ||
41d8d5b7 | 103 | pgio->pg_ops = &nfs_pgio_rw_ops; |
a7d42ddb WAA |
104 | |
105 | /* read path should never have more than one mirror */ | |
106 | WARN_ON_ONCE(pgio->pg_mirror_count != 1); | |
107 | ||
108 | mirror = &pgio->pg_mirrors[0]; | |
109 | mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->rsize; | |
493292dd | 110 | } |
1f945357 | 111 | EXPORT_SYMBOL_GPL(nfs_pageio_reset_read_mds); |
493292dd | 112 | |
303a7805 AS |
113 | bool nfs_read_alloc_scratch(struct nfs_pgio_header *hdr, size_t size) |
114 | { | |
115 | WARN_ON(hdr->res.scratch != NULL); | |
116 | hdr->res.scratch = kmalloc(size, GFP_KERNEL); | |
117 | return hdr->res.scratch != NULL; | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(nfs_read_alloc_scratch); | |
120 | ||
8f54c7a4 | 121 | static void nfs_readpage_release(struct nfs_page *req, int error) |
0bcbf039 | 122 | { |
ab75bff1 | 123 | struct folio *folio = nfs_page_to_folio(req); |
0bcbf039 | 124 | |
8f54c7a4 | 125 | if (nfs_error_is_fatal_on_server(error) && error != -ETIMEDOUT) |
ab75bff1 | 126 | folio_set_error(folio); |
000dbe0b DW |
127 | if (nfs_page_group_sync_on_bit(req, PG_UNLOCKPAGE)) |
128 | if (nfs_netfs_folio_unlock(folio)) | |
129 | folio_unlock(folio); | |
130 | ||
0bcbf039 PT |
131 | nfs_release_request(req); |
132 | } | |
133 | ||
67d0338e WAA |
134 | static void nfs_page_group_set_uptodate(struct nfs_page *req) |
135 | { | |
136 | if (nfs_page_group_sync_on_bit(req, PG_UPTODATE)) | |
ab75bff1 | 137 | folio_mark_uptodate(nfs_page_to_folio(req)); |
67d0338e WAA |
138 | } |
139 | ||
061ae2ed | 140 | static void nfs_read_completion(struct nfs_pgio_header *hdr) |
4db6e0b7 FI |
141 | { |
142 | unsigned long bytes = 0; | |
8f54c7a4 | 143 | int error; |
4db6e0b7 FI |
144 | |
145 | if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) | |
146 | goto out; | |
4bd8b010 TM |
147 | while (!list_empty(&hdr->pages)) { |
148 | struct nfs_page *req = nfs_list_entry(hdr->pages.next); | |
ab75bff1 | 149 | struct folio *folio = nfs_page_to_folio(req); |
68072992 WAA |
150 | unsigned long start = req->wb_pgbase; |
151 | unsigned long end = req->wb_pgbase + req->wb_bytes; | |
4bd8b010 TM |
152 | |
153 | if (test_bit(NFS_IOHDR_EOF, &hdr->flags)) { | |
68072992 | 154 | /* note: regions of the page not covered by a |
01c3a400 DW |
155 | * request are zeroed in nfs_read_add_folio |
156 | */ | |
68072992 WAA |
157 | if (bytes > hdr->good_bytes) { |
158 | /* nothing in this request was good, so zero | |
159 | * the full extent of the request */ | |
ab75bff1 | 160 | folio_zero_segment(folio, start, end); |
68072992 WAA |
161 | |
162 | } else if (hdr->good_bytes - bytes < req->wb_bytes) { | |
163 | /* part of this request has good bytes, but | |
164 | * not all. zero the bad bytes */ | |
165 | start += hdr->good_bytes - bytes; | |
166 | WARN_ON(start < req->wb_pgbase); | |
ab75bff1 | 167 | folio_zero_segment(folio, start, end); |
68072992 | 168 | } |
4db6e0b7 | 169 | } |
8f54c7a4 | 170 | error = 0; |
4bd8b010 TM |
171 | bytes += req->wb_bytes; |
172 | if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) { | |
4db6e0b7 | 173 | if (bytes <= hdr->good_bytes) |
67d0338e | 174 | nfs_page_group_set_uptodate(req); |
8f54c7a4 TM |
175 | else { |
176 | error = hdr->error; | |
177 | xchg(&nfs_req_openctx(req)->error, error); | |
178 | } | |
4bd8b010 | 179 | } else |
67d0338e | 180 | nfs_page_group_set_uptodate(req); |
4bd8b010 | 181 | nfs_list_remove_request(req); |
8f54c7a4 | 182 | nfs_readpage_release(req, error); |
4db6e0b7 | 183 | } |
000dbe0b DW |
184 | nfs_netfs_read_completion(hdr); |
185 | ||
4db6e0b7 FI |
186 | out: |
187 | hdr->release(hdr); | |
188 | } | |
189 | ||
d45f60c6 WAA |
190 | static void nfs_initiate_read(struct nfs_pgio_header *hdr, |
191 | struct rpc_message *msg, | |
abde71f4 | 192 | const struct nfs_rpc_ops *rpc_ops, |
1ed26f33 | 193 | struct rpc_task_setup *task_setup_data, int how) |
1da177e4 | 194 | { |
abde71f4 | 195 | rpc_ops->read_setup(hdr, msg); |
000dbe0b | 196 | nfs_netfs_initiate_read(hdr); |
2343172d | 197 | trace_nfs_initiate_read(hdr); |
64419a9b AA |
198 | } |
199 | ||
061ae2ed | 200 | static void |
df3accb8 | 201 | nfs_async_read_error(struct list_head *head, int error) |
1da177e4 LT |
202 | { |
203 | struct nfs_page *req; | |
204 | ||
205 | while (!list_empty(head)) { | |
206 | req = nfs_list_entry(head->next); | |
207 | nfs_list_remove_request(req); | |
8f54c7a4 | 208 | nfs_readpage_release(req, error); |
1da177e4 LT |
209 | } |
210 | } | |
211 | ||
000dbe0b | 212 | const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = { |
061ae2ed FI |
213 | .error_cleanup = nfs_async_read_error, |
214 | .completion = nfs_read_completion, | |
215 | }; | |
216 | ||
0b671301 TM |
217 | /* |
218 | * This is the callback from RPC telling us whether a reply was | |
219 | * received or some error occurred (timeout or socket shutdown). | |
220 | */ | |
d45f60c6 WAA |
221 | static int nfs_readpage_done(struct rpc_task *task, |
222 | struct nfs_pgio_header *hdr, | |
0eecb214 | 223 | struct inode *inode) |
0b671301 | 224 | { |
d45f60c6 | 225 | int status = NFS_PROTO(inode)->read_done(task, hdr); |
0b671301 TM |
226 | if (status != 0) |
227 | return status; | |
228 | ||
d45f60c6 | 229 | nfs_add_stats(inode, NFSIOS_SERVERREADBYTES, hdr->res.count); |
2343172d | 230 | trace_nfs_readpage_done(task, hdr); |
0b671301 TM |
231 | |
232 | if (task->tk_status == -ESTALE) { | |
93ce4af7 | 233 | nfs_set_inode_stale(inode); |
cd841605 | 234 | nfs_mark_for_revalidate(inode); |
0b671301 | 235 | } |
0b671301 TM |
236 | return 0; |
237 | } | |
238 | ||
d45f60c6 WAA |
239 | static void nfs_readpage_retry(struct rpc_task *task, |
240 | struct nfs_pgio_header *hdr) | |
0b671301 | 241 | { |
d45f60c6 WAA |
242 | struct nfs_pgio_args *argp = &hdr->args; |
243 | struct nfs_pgio_res *resp = &hdr->res; | |
0b671301 | 244 | |
0b671301 | 245 | /* This is a short read! */ |
d45f60c6 | 246 | nfs_inc_stats(hdr->inode, NFSIOS_SHORTREAD); |
fd2b6121 CL |
247 | trace_nfs_readpage_short(task, hdr); |
248 | ||
0b671301 | 249 | /* Has the server at least made some progress? */ |
4db6e0b7 | 250 | if (resp->count == 0) { |
d45f60c6 | 251 | nfs_set_pgio_error(hdr, -EIO, argp->offset); |
d61e612a | 252 | return; |
4db6e0b7 | 253 | } |
f8417b48 KM |
254 | |
255 | /* For non rpc-based layout drivers, retry-through-MDS */ | |
256 | if (!task->tk_ops) { | |
257 | hdr->pnfs_error = -EAGAIN; | |
258 | return; | |
259 | } | |
260 | ||
d45f60c6 WAA |
261 | /* Yes, so retry the read at the end of the hdr */ |
262 | hdr->mds_offset += resp->count; | |
0b671301 TM |
263 | argp->offset += resp->count; |
264 | argp->pgbase += resp->count; | |
265 | argp->count -= resp->count; | |
8c9cb714 TM |
266 | resp->count = 0; |
267 | resp->eof = 0; | |
d00c5d43 | 268 | rpc_restart_call_prepare(task); |
0b671301 TM |
269 | } |
270 | ||
d45f60c6 WAA |
271 | static void nfs_readpage_result(struct rpc_task *task, |
272 | struct nfs_pgio_header *hdr) | |
1da177e4 | 273 | { |
d45f60c6 | 274 | if (hdr->res.eof) { |
1c6c4b74 TM |
275 | loff_t pos = hdr->args.offset + hdr->res.count; |
276 | unsigned int new = pos - hdr->io_start; | |
4db6e0b7 | 277 | |
1c6c4b74 TM |
278 | if (hdr->good_bytes > new) { |
279 | hdr->good_bytes = new; | |
4db6e0b7 FI |
280 | set_bit(NFS_IOHDR_EOF, &hdr->flags); |
281 | clear_bit(NFS_IOHDR_ERROR, &hdr->flags); | |
4db6e0b7 | 282 | } |
f8417b48 | 283 | } else if (hdr->res.count < hdr->args.count) |
d45f60c6 | 284 | nfs_readpage_retry(task, hdr); |
fdd1e74c TM |
285 | } |
286 | ||
000dbe0b DW |
287 | int nfs_read_add_folio(struct nfs_pageio_descriptor *pgio, |
288 | struct nfs_open_context *ctx, | |
289 | struct folio *folio) | |
1e83b173 | 290 | { |
ab75bff1 TM |
291 | struct inode *inode = folio_file_mapping(folio)->host; |
292 | struct nfs_server *server = NFS_SERVER(inode); | |
293 | size_t fsize = folio_size(folio); | |
294 | unsigned int rsize = server->rsize; | |
1e83b173 | 295 | struct nfs_page *new; |
8cfb9015 | 296 | unsigned int len, aligned_len; |
1e83b173 DW |
297 | int error; |
298 | ||
ab75bff1 | 299 | len = nfs_folio_length(folio); |
1e83b173 | 300 | if (len == 0) |
ab75bff1 | 301 | return nfs_return_empty_folio(folio); |
1e83b173 | 302 | |
ab75bff1 | 303 | aligned_len = min_t(unsigned int, ALIGN(len, rsize), fsize); |
8cfb9015 | 304 | |
01c3a400 | 305 | new = nfs_page_create_from_folio(ctx, folio, 0, aligned_len); |
000dbe0b DW |
306 | if (IS_ERR(new)) { |
307 | error = PTR_ERR(new); | |
308 | goto out; | |
309 | } | |
1e83b173 | 310 | |
ab75bff1 TM |
311 | if (len < fsize) |
312 | folio_zero_segment(folio, len, fsize); | |
01c3a400 | 313 | if (!nfs_pageio_add_request(pgio, new)) { |
1e83b173 | 314 | nfs_list_remove_request(new); |
01c3a400 | 315 | error = pgio->pg_error; |
1e83b173 DW |
316 | nfs_readpage_release(new, error); |
317 | goto out; | |
318 | } | |
319 | return 0; | |
1e83b173 DW |
320 | out: |
321 | return error; | |
322 | } | |
323 | ||
1da177e4 LT |
324 | /* |
325 | * Read a page over NFS. | |
326 | * We read the page synchronously in the following case: | |
327 | * - The error flag is set for this page. This happens only when a | |
328 | * previous async read operation failed. | |
329 | */ | |
65d023af | 330 | int nfs_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 331 | { |
ab75bff1 | 332 | struct inode *inode = file_inode(file); |
01c3a400 DW |
333 | struct nfs_pageio_descriptor pgio; |
334 | struct nfs_open_context *ctx; | |
49dee700 | 335 | int ret; |
1da177e4 | 336 | |
ab75bff1 | 337 | trace_nfs_aop_readpage(inode, folio); |
91d5b470 | 338 | nfs_inc_stats(inode, NFSIOS_VFSREADPAGE); |
9c88ea00 | 339 | task_io_account_read(folio_size(folio)); |
91d5b470 | 340 | |
1da177e4 LT |
341 | /* |
342 | * Try to flush any pending writes to the file.. | |
343 | * | |
ab75bff1 | 344 | * NOTE! Because we own the folio lock, there cannot |
1da177e4 | 345 | * be any new pending writes generated at this point |
ab75bff1 | 346 | * for this folio (other folios can be written to). |
1da177e4 | 347 | */ |
ab75bff1 | 348 | ret = nfs_wb_folio(inode, folio); |
49dee700 | 349 | if (ret) |
de05a0cc | 350 | goto out_unlock; |
ab75bff1 | 351 | if (folio_test_uptodate(folio)) |
de05a0cc | 352 | goto out_unlock; |
1da177e4 | 353 | |
49dee700 | 354 | ret = -ESTALE; |
5f004cf2 | 355 | if (NFS_STALE(inode)) |
de05a0cc | 356 | goto out_unlock; |
5f004cf2 | 357 | |
000dbe0b DW |
358 | ret = nfs_netfs_read_folio(file, folio); |
359 | if (!ret) | |
360 | goto out; | |
361 | ||
01c3a400 | 362 | ctx = get_nfs_open_context(nfs_file_open_context(file)); |
1da177e4 | 363 | |
01c3a400 DW |
364 | xchg(&ctx->error, 0); |
365 | nfs_pageio_init_read(&pgio, inode, false, | |
1e83b173 DW |
366 | &nfs_async_read_completion_ops); |
367 | ||
01c3a400 | 368 | ret = nfs_read_add_folio(&pgio, ctx, folio); |
e0340f16 | 369 | if (ret) |
000dbe0b | 370 | goto out_put; |
1e83b173 | 371 | |
01c3a400 DW |
372 | nfs_pageio_complete_read(&pgio); |
373 | ret = pgio.pg_error < 0 ? pgio.pg_error : 0; | |
49dee700 | 374 | if (!ret) { |
ab75bff1 TM |
375 | ret = folio_wait_locked_killable(folio); |
376 | if (!folio_test_uptodate(folio) && !ret) | |
01c3a400 | 377 | ret = xchg(&ctx->error, 0); |
8f54c7a4 | 378 | } |
000dbe0b | 379 | out_put: |
01c3a400 | 380 | put_nfs_open_context(ctx); |
000dbe0b | 381 | out: |
ab75bff1 | 382 | trace_nfs_aop_readpage_done(inode, folio, ret); |
49dee700 | 383 | return ret; |
de05a0cc | 384 | out_unlock: |
ab75bff1 | 385 | folio_unlock(folio); |
000dbe0b | 386 | goto out; |
1da177e4 LT |
387 | } |
388 | ||
8786fde8 | 389 | void nfs_readahead(struct readahead_control *ractl) |
1da177e4 | 390 | { |
01c3a400 DW |
391 | struct nfs_pageio_descriptor pgio; |
392 | struct nfs_open_context *ctx; | |
8786fde8 MWO |
393 | unsigned int nr_pages = readahead_count(ractl); |
394 | struct file *file = ractl->file; | |
8786fde8 | 395 | struct inode *inode = ractl->mapping->host; |
ab75bff1 | 396 | struct folio *folio; |
49dee700 | 397 | int ret; |
1da177e4 | 398 | |
8786fde8 | 399 | trace_nfs_aop_readahead(inode, readahead_pos(ractl), nr_pages); |
91d5b470 | 400 | nfs_inc_stats(inode, NFSIOS_VFSREADPAGES); |
9c88ea00 | 401 | task_io_account_read(readahead_length(ractl)); |
1da177e4 | 402 | |
49dee700 | 403 | ret = -ESTALE; |
5f004cf2 TM |
404 | if (NFS_STALE(inode)) |
405 | goto out; | |
406 | ||
000dbe0b DW |
407 | ret = nfs_netfs_readahead(ractl); |
408 | if (!ret) | |
409 | goto out; | |
410 | ||
49dee700 DW |
411 | if (file == NULL) { |
412 | ret = -EBADF; | |
01c3a400 DW |
413 | ctx = nfs_find_open_context(inode, NULL, FMODE_READ); |
414 | if (ctx == NULL) | |
49dee700 | 415 | goto out; |
1da177e4 | 416 | } else |
01c3a400 | 417 | ctx = get_nfs_open_context(nfs_file_open_context(file)); |
9a9fc1c0 | 418 | |
01c3a400 | 419 | nfs_pageio_init_read(&pgio, inode, false, |
fab5fc25 | 420 | &nfs_async_read_completion_ops); |
8b09bee3 | 421 | |
ab75bff1 | 422 | while ((folio = readahead_folio(ractl)) != NULL) { |
01c3a400 | 423 | ret = nfs_read_add_folio(&pgio, ctx, folio); |
8786fde8 MWO |
424 | if (ret) |
425 | break; | |
426 | } | |
a7d42ddb | 427 | |
01c3a400 | 428 | nfs_pageio_complete_read(&pgio); |
a7d42ddb | 429 | |
01c3a400 | 430 | put_nfs_open_context(ctx); |
5f004cf2 | 431 | out: |
d9f87743 | 432 | trace_nfs_aop_readahead_done(inode, nr_pages, ret); |
1da177e4 LT |
433 | } |
434 | ||
f7b422b1 | 435 | int __init nfs_init_readpagecache(void) |
1da177e4 LT |
436 | { |
437 | nfs_rdata_cachep = kmem_cache_create("nfs_read_data", | |
1e7f3a48 | 438 | sizeof(struct nfs_pgio_header), |
1da177e4 | 439 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 440 | NULL); |
1da177e4 LT |
441 | if (nfs_rdata_cachep == NULL) |
442 | return -ENOMEM; | |
443 | ||
1da177e4 LT |
444 | return 0; |
445 | } | |
446 | ||
266bee88 | 447 | void nfs_destroy_readpagecache(void) |
1da177e4 | 448 | { |
1a1d92c1 | 449 | kmem_cache_destroy(nfs_rdata_cachep); |
1da177e4 | 450 | } |
4a0de55c AS |
451 | |
452 | static const struct nfs_rw_ops nfs_rw_read_ops = { | |
453 | .rw_alloc_header = nfs_readhdr_alloc, | |
454 | .rw_free_header = nfs_readhdr_free, | |
0eecb214 AS |
455 | .rw_done = nfs_readpage_done, |
456 | .rw_result = nfs_readpage_result, | |
1ed26f33 | 457 | .rw_initiate = nfs_initiate_read, |
4a0de55c | 458 | }; |