blob: 3d17fc82b9fece1fb87d8cc98b5834e53cd48489 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/pagelist.c
3 *
4 * A set of helper functions for managing NFS read and write requests.
5 * The main purpose of these routines is to provide support for the
6 * coalescing of several requests into a single RPC call.
7 *
8 * Copyright 2000, 2001 (c) Trond Myklebust <trond.myklebust@fys.uio.no>
9 *
10 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/slab.h>
13#include <linux/file.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040014#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/clnt.h>
Trond Myklebust1313e602012-01-17 22:04:24 -050016#include <linux/nfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/nfs3.h>
18#include <linux/nfs4.h>
19#include <linux/nfs_page.h>
20#include <linux/nfs_fs.h>
21#include <linux/nfs_mount.h>
Paul Gortmakerafeacc82011-05-26 16:00:52 -040022#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Trond Myklebust8d5658c2007-04-10 09:26:35 -040024#include "internal.h"
Fred Isamanbae724e2011-03-01 01:34:15 +000025#include "pnfs.h"
Trond Myklebust8d5658c2007-04-10 09:26:35 -040026
Anna Schumaker0eecb212014-05-06 09:12:32 -040027#define NFSDBG_FACILITY NFSDBG_PAGECACHE
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static struct kmem_cache *nfs_page_cachep;
Anna Schumakeref2c4882014-05-06 09:12:36 -040030static const struct rpc_call_ops nfs_pgio_common_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Benjamin Coddingtonf2b6f502017-04-19 10:11:33 -040032static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount,
33 gfp_t gfp_flags)
Fred Isaman30dd3742012-04-20 14:47:45 -040034{
35 p->npages = pagecount;
36 if (pagecount <= ARRAY_SIZE(p->page_array))
37 p->pagevec = p->page_array;
38 else {
Benjamin Coddingtonf2b6f502017-04-19 10:11:33 -040039 p->pagevec = kcalloc(pagecount, sizeof(struct page *), gfp_flags);
Fred Isaman30dd3742012-04-20 14:47:45 -040040 if (!p->pagevec)
41 p->npages = 0;
42 }
43 return p->pagevec != NULL;
44}
45
Peng Tao48d635f2014-11-10 08:35:35 +080046struct nfs_pgio_mirror *
47nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc)
48{
49 return nfs_pgio_has_mirroring(desc) ?
50 &desc->pg_mirrors[desc->pg_mirror_idx] :
51 &desc->pg_mirrors[0];
52}
53EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror);
54
Fred Isaman4db6e0b2012-04-20 14:47:46 -040055void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
56 struct nfs_pgio_header *hdr,
57 void (*release)(struct nfs_pgio_header *hdr))
58{
Peng Tao48d635f2014-11-10 08:35:35 +080059 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -040060
61
62 hdr->req = nfs_list_entry(mirror->pg_list.next);
Fred Isaman4db6e0b2012-04-20 14:47:46 -040063 hdr->inode = desc->pg_inode;
64 hdr->cred = hdr->req->wb_context->cred;
65 hdr->io_start = req_offset(hdr->req);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -040066 hdr->good_bytes = mirror->pg_count;
Fred Isaman584aa812012-04-20 14:47:51 -040067 hdr->dreq = desc->pg_dreq;
Peng Taof6166382012-08-02 15:36:09 +030068 hdr->layout_private = desc->pg_layout_private;
Fred Isaman4db6e0b2012-04-20 14:47:46 -040069 hdr->release = release;
Fred Isaman061ae2e2012-04-20 14:47:48 -040070 hdr->completion_ops = desc->pg_completion_ops;
Fred Isaman584aa812012-04-20 14:47:51 -040071 if (hdr->completion_ops->init_hdr)
72 hdr->completion_ops->init_hdr(hdr);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -040073
74 hdr->pgio_mirror_idx = desc->pg_mirror_idx;
Fred Isaman4db6e0b2012-04-20 14:47:46 -040075}
Bryan Schumaker89d77c82012-07-30 16:05:25 -040076EXPORT_SYMBOL_GPL(nfs_pgheader_init);
Fred Isaman4db6e0b2012-04-20 14:47:46 -040077
78void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos)
79{
80 spin_lock(&hdr->lock);
Trond Myklebuste9ae58a2015-08-17 12:57:07 -050081 if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags)
82 || pos < hdr->io_start + hdr->good_bytes) {
Fred Isaman4db6e0b2012-04-20 14:47:46 -040083 clear_bit(NFS_IOHDR_EOF, &hdr->flags);
84 hdr->good_bytes = pos - hdr->io_start;
85 hdr->error = error;
86 }
87 spin_unlock(&hdr->lock);
88}
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090static inline struct nfs_page *
91nfs_page_alloc(void)
92{
Mel Gorman192e5012012-07-31 16:45:16 -070093 struct nfs_page *p = kmem_cache_zalloc(nfs_page_cachep, GFP_NOIO);
Jesper Juhl72895b12010-12-09 23:17:15 +010094 if (p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 INIT_LIST_HEAD(&p->wb_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 return p;
97}
98
99static inline void
100nfs_page_free(struct nfs_page *p)
101{
102 kmem_cache_free(nfs_page_cachep, p);
103}
104
Trond Myklebust577b4232013-04-08 21:38:12 -0400105/**
106 * nfs_iocounter_wait - wait for i/o to complete
Benjamin Coddington210c7c12016-01-06 10:40:18 -0500107 * @l_ctx: nfs_lock_context with io_counter to use
Trond Myklebust577b4232013-04-08 21:38:12 -0400108 *
109 * returns -ERESTARTSYS if interrupted by a fatal signal.
110 * Otherwise returns 0 once the io_count hits 0.
111 */
112int
Benjamin Coddington210c7c12016-01-06 10:40:18 -0500113nfs_iocounter_wait(struct nfs_lock_context *l_ctx)
Trond Myklebust577b4232013-04-08 21:38:12 -0400114{
Benjamin Coddington210c7c12016-01-06 10:40:18 -0500115 return wait_on_atomic_t(&l_ctx->io_count, nfs_wait_atomic_killable,
116 TASK_KILLABLE);
Trond Myklebust577b4232013-04-08 21:38:12 -0400117}
118
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400119/*
120 * nfs_page_group_lock - lock the head of the page group
121 * @req - request in group that is to be locked
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400122 * @nonblock - if true don't block waiting for lock
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400123 *
124 * this lock must be held if modifying the page group list
Weston Andros Adamsone7029202014-07-17 20:42:15 -0400125 *
Weston Andros Adamsonbc8a3092014-08-08 11:00:54 -0400126 * return 0 on success, < 0 on error: -EDELAY if nonblocking or the
127 * result from wait_on_bit_lock
128 *
129 * NOTE: calling with nonblock=false should always have set the
130 * lock bit (see fs/buffer.c and other uses of wait_on_bit_lock
131 * with TASK_UNINTERRUPTIBLE), so there is no need to check the result.
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400132 */
Weston Andros Adamsone7029202014-07-17 20:42:15 -0400133int
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400134nfs_page_group_lock(struct nfs_page *req, bool nonblock)
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400135{
136 struct nfs_page *head = req->wb_head;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400137
138 WARN_ON_ONCE(head != head->wb_head);
139
Weston Andros Adamsonbc8a3092014-08-08 11:00:54 -0400140 if (!test_and_set_bit(PG_HEADLOCK, &head->wb_flags))
141 return 0;
Weston Andros Adamsone7029202014-07-17 20:42:15 -0400142
Weston Andros Adamsonbc8a3092014-08-08 11:00:54 -0400143 if (!nonblock)
144 return wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK,
145 TASK_UNINTERRUPTIBLE);
146
147 return -EAGAIN;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400148}
149
150/*
Weston Andros Adamson7c3af972014-08-08 11:00:57 -0400151 * nfs_page_group_lock_wait - wait for the lock to clear, but don't grab it
152 * @req - a request in the group
153 *
154 * This is a blocking call to wait for the group lock to be cleared.
155 */
156void
157nfs_page_group_lock_wait(struct nfs_page *req)
158{
159 struct nfs_page *head = req->wb_head;
160
161 WARN_ON_ONCE(head != head->wb_head);
162
163 wait_on_bit(&head->wb_flags, PG_HEADLOCK,
164 TASK_UNINTERRUPTIBLE);
165}
166
167/*
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400168 * nfs_page_group_unlock - unlock the head of the page group
169 * @req - request in group that is to be unlocked
170 */
171void
172nfs_page_group_unlock(struct nfs_page *req)
173{
174 struct nfs_page *head = req->wb_head;
175
176 WARN_ON_ONCE(head != head->wb_head);
177
Linus Torvaldsd1e1cda2014-06-10 15:02:42 -0700178 smp_mb__before_atomic();
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400179 clear_bit(PG_HEADLOCK, &head->wb_flags);
Linus Torvaldsd1e1cda2014-06-10 15:02:42 -0700180 smp_mb__after_atomic();
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400181 wake_up_bit(&head->wb_flags, PG_HEADLOCK);
182}
183
184/*
185 * nfs_page_group_sync_on_bit_locked
186 *
187 * must be called with page group lock held
188 */
189static bool
190nfs_page_group_sync_on_bit_locked(struct nfs_page *req, unsigned int bit)
191{
192 struct nfs_page *head = req->wb_head;
193 struct nfs_page *tmp;
194
195 WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_flags));
196 WARN_ON_ONCE(test_and_set_bit(bit, &req->wb_flags));
197
198 tmp = req->wb_this_page;
199 while (tmp != req) {
200 if (!test_bit(bit, &tmp->wb_flags))
201 return false;
202 tmp = tmp->wb_this_page;
203 }
204
205 /* true! reset all bits */
206 tmp = req;
207 do {
208 clear_bit(bit, &tmp->wb_flags);
209 tmp = tmp->wb_this_page;
210 } while (tmp != req);
211
212 return true;
213}
214
215/*
216 * nfs_page_group_sync_on_bit - set bit on current request, but only
217 * return true if the bit is set for all requests in page group
218 * @req - request in page group
219 * @bit - PG_* bit that is used to sync page group
220 */
221bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit)
222{
223 bool ret;
224
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400225 nfs_page_group_lock(req, false);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400226 ret = nfs_page_group_sync_on_bit_locked(req, bit);
227 nfs_page_group_unlock(req);
228
229 return ret;
230}
231
232/*
233 * nfs_page_group_init - Initialize the page group linkage for @req
234 * @req - a new nfs request
235 * @prev - the previous request in page group, or NULL if @req is the first
236 * or only request in the group (the head).
237 */
238static inline void
239nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev)
240{
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500241 struct inode *inode;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400242 WARN_ON_ONCE(prev == req);
243
244 if (!prev) {
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400245 /* a head request */
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400246 req->wb_head = req;
247 req->wb_this_page = req;
248 } else {
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400249 /* a subrequest */
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400250 WARN_ON_ONCE(prev->wb_this_page != prev->wb_head);
251 WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags));
252 req->wb_head = prev->wb_head;
253 req->wb_this_page = prev->wb_this_page;
254 prev->wb_this_page = req;
255
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400256 /* All subrequests take a ref on the head request until
257 * nfs_page_group_destroy is called */
258 kref_get(&req->wb_head->wb_kref);
259
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500260 /* grab extra ref and bump the request count if head request
261 * has extra ref from the write/commit path to handle handoff
262 * between write and commit lists. */
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400263 if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) {
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500264 inode = page_file_mapping(req->wb_page)->host;
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400265 set_bit(PG_INODE_REF, &req->wb_flags);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400266 kref_get(&req->wb_kref);
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500267 spin_lock(&inode->i_lock);
268 NFS_I(inode)->nrequests++;
269 spin_unlock(&inode->i_lock);
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400270 }
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400271 }
272}
273
274/*
275 * nfs_page_group_destroy - sync the destruction of page groups
276 * @req - request that no longer needs the page group
277 *
278 * releases the page group reference from each member once all
279 * members have called this function.
280 */
281static void
282nfs_page_group_destroy(struct kref *kref)
283{
284 struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref);
285 struct nfs_page *tmp, *next;
286
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400287 /* subrequests must release the ref on the head request */
288 if (req->wb_head != req)
289 nfs_release_request(req->wb_head);
290
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400291 if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN))
292 return;
293
294 tmp = req;
295 do {
296 next = tmp->wb_this_page;
297 /* unlink and free */
298 tmp->wb_this_page = tmp;
299 tmp->wb_head = tmp;
300 nfs_free_request(tmp);
301 tmp = next;
302 } while (tmp != req);
303}
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305/**
306 * nfs_create_request - Create an NFS read/write request.
Chuck Leverc02f5572011-10-25 12:17:43 -0400307 * @ctx: open context to use
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 * @page: page to write
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400309 * @last: last nfs request created for this page group or NULL if head
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 * @offset: starting offset within the page for the write
311 * @count: number of bytes to read/write
312 *
313 * The page must be locked by the caller. This makes sure we never
Jason Uhlenkotta19b89c2007-04-26 17:25:51 -0700314 * create two different requests for the same page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 * User should ensure it is safe to sleep in this function.
316 */
317struct nfs_page *
Weston Andros Adamson8c8f1ac12014-05-15 11:56:42 -0400318nfs_create_request(struct nfs_open_context *ctx, struct page *page,
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400319 struct nfs_page *last, unsigned int offset,
320 unsigned int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 struct nfs_page *req;
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400323 struct nfs_lock_context *l_ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Trond Myklebustc58c8442013-03-18 19:45:14 -0400325 if (test_bit(NFS_CONTEXT_BAD, &ctx->flags))
326 return ERR_PTR(-EBADF);
Trond Myklebust18eb8842010-05-13 12:51:02 -0400327 /* try to allocate the request struct */
328 req = nfs_page_alloc();
329 if (req == NULL)
330 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Jeff Layton015f0212010-10-28 10:10:37 -0400332 /* get lock context early so we can deal with alloc failures */
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400333 l_ctx = nfs_get_lock_context(ctx);
334 if (IS_ERR(l_ctx)) {
Jeff Layton015f0212010-10-28 10:10:37 -0400335 nfs_page_free(req);
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400336 return ERR_CAST(l_ctx);
Jeff Layton015f0212010-10-28 10:10:37 -0400337 }
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400338 req->wb_lock_context = l_ctx;
Benjamin Coddington210c7c12016-01-06 10:40:18 -0500339 atomic_inc(&l_ctx->io_count);
Jeff Layton015f0212010-10-28 10:10:37 -0400340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 /* Initialize the request struct. Initially, we assume a
342 * long write-back delay. This will be adjusted in
343 * update_nfs_request below if the region is not locked. */
344 req->wb_page = page;
Anna Schumaker67911c82016-01-19 14:37:30 -0500345 if (page) {
Huang Ying8cd79782016-10-07 17:00:24 -0700346 req->wb_index = page_index(page);
Anna Schumaker67911c82016-01-19 14:37:30 -0500347 get_page(page);
348 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 req->wb_offset = offset;
350 req->wb_pgbase = offset;
351 req->wb_bytes = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 req->wb_context = get_nfs_open_context(ctx);
Trond Myklebustc03b4022007-06-17 13:26:38 -0400353 kref_init(&req->wb_kref);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400354 nfs_page_group_init(req, last);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 return req;
356}
357
358/**
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400359 * nfs_unlock_request - Unlock request and wake up sleepers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 * @req:
361 */
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400362void nfs_unlock_request(struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
364 if (!NFS_WBACK_BUSY(req)) {
365 printk(KERN_ERR "NFS: Invalid unlock attempted\n");
366 BUG();
367 }
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100368 smp_mb__before_atomic();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 clear_bit(PG_BUSY, &req->wb_flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100370 smp_mb__after_atomic();
Trond Myklebust464a98b2005-06-22 17:16:21 +0000371 wake_up_bit(&req->wb_flags, PG_BUSY);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400372}
373
374/**
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400375 * nfs_unlock_and_release_request - Unlock request and release the nfs_page
376 * @req:
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400377 */
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400378void nfs_unlock_and_release_request(struct nfs_page *req)
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400379{
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400380 nfs_unlock_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 nfs_release_request(req);
382}
383
Trond Myklebust4d65c522011-03-25 14:15:11 -0400384/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 * nfs_clear_request - Free up all resources allocated to the request
386 * @req:
387 *
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500388 * Release page and open context resources associated with a read/write
389 * request after it has completed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 */
Trond Myklebust4d65c522011-03-25 14:15:11 -0400391static void nfs_clear_request(struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500393 struct page *page = req->wb_page;
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500394 struct nfs_open_context *ctx = req->wb_context;
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400395 struct nfs_lock_context *l_ctx = req->wb_lock_context;
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500396
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500397 if (page != NULL) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300398 put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 req->wb_page = NULL;
400 }
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400401 if (l_ctx != NULL) {
Benjamin Coddington210c7c12016-01-06 10:40:18 -0500402 if (atomic_dec_and_test(&l_ctx->io_count))
403 wake_up_atomic_t(&l_ctx->io_count);
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400404 nfs_put_lock_context(l_ctx);
405 req->wb_lock_context = NULL;
406 }
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500407 if (ctx != NULL) {
408 put_nfs_open_context(ctx);
409 req->wb_context = NULL;
410 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411}
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413/**
414 * nfs_release_request - Release the count on an NFS read/write request
415 * @req: request to release
416 *
417 * Note: Should never be called with the spinlock held!
418 */
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400419void nfs_free_request(struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400421 WARN_ON_ONCE(req->wb_this_page != req);
422
423 /* extra debug: make sure no sync bits are still set */
424 WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags));
Weston Andros Adamson67d03382014-05-15 11:56:46 -0400425 WARN_ON_ONCE(test_bit(PG_UNLOCKPAGE, &req->wb_flags));
426 WARN_ON_ONCE(test_bit(PG_UPTODATE, &req->wb_flags));
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400427 WARN_ON_ONCE(test_bit(PG_WB_END, &req->wb_flags));
428 WARN_ON_ONCE(test_bit(PG_REMOVE, &req->wb_flags));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500430 /* Release struct file and open context */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 nfs_clear_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 nfs_page_free(req);
433}
434
Trond Myklebustc03b4022007-06-17 13:26:38 -0400435void nfs_release_request(struct nfs_page *req)
436{
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400437 kref_put(&req->wb_kref, nfs_page_group_destroy);
Trond Myklebust9f557cd2010-02-03 08:27:22 -0500438}
439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440/**
441 * nfs_wait_on_request - Wait for a request to complete.
442 * @req: request to wait upon.
443 *
Matthew Wilcox150030b2007-12-06 16:24:39 -0500444 * Interruptible by fatal signals only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 * The user is responsible for holding a count on the request.
446 */
447int
448nfs_wait_on_request(struct nfs_page *req)
449{
NeilBrown74316202014-07-07 15:16:04 +1000450 return wait_on_bit_io(&req->wb_flags, PG_BUSY,
451 TASK_UNINTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400454/*
455 * nfs_generic_pg_test - determine if requests can be coalesced
456 * @desc: pointer to descriptor
457 * @prev: previous request in desc, or NULL
458 * @req: this request
459 *
460 * Returns zero if @req can be coalesced into @desc, otherwise it returns
461 * the size of the request.
462 */
463size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
464 struct nfs_page *prev, struct nfs_page *req)
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300465{
Peng Tao48d635f2014-11-10 08:35:35 +0800466 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400467
468
469 if (mirror->pg_count > mirror->pg_bsize) {
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400470 /* should never happen */
471 WARN_ON_ONCE(1);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300472 return 0;
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400473 }
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300474
Christoph Hellwig2e11f822014-08-21 11:09:17 -0500475 /*
476 * Limit the request size so that we can still allocate a page array
477 * for it without upsetting the slab allocator.
478 */
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400479 if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) *
Peng Tao048883e2015-09-11 11:14:06 +0800480 sizeof(struct page *) > PAGE_SIZE)
Christoph Hellwig2e11f822014-08-21 11:09:17 -0500481 return 0;
482
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400483 return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300484}
Benny Halevy19345cb2011-06-19 18:33:46 -0400485EXPORT_SYMBOL_GPL(nfs_generic_pg_test);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300486
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400487struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops)
Anna Schumaker00bfa302014-05-06 09:12:29 -0400488{
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400489 struct nfs_pgio_header *hdr = ops->rw_alloc_header();
Anna Schumaker00bfa302014-05-06 09:12:29 -0400490
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400491 if (hdr) {
Anna Schumaker4a0de552014-05-06 09:12:30 -0400492 INIT_LIST_HEAD(&hdr->pages);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400493 spin_lock_init(&hdr->lock);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400494 hdr->rw_ops = ops;
495 }
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400496 return hdr;
Anna Schumaker4a0de552014-05-06 09:12:30 -0400497}
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400498EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400499
Anna Schumaker4a0de552014-05-06 09:12:30 -0400500/**
Weston Andros Adamson4714fb52014-06-09 11:48:37 -0400501 * nfs_pgio_data_destroy - make @hdr suitable for reuse
502 *
503 * Frees memory and releases refs from nfs_generic_pgio, so that it may
504 * be called again.
505 *
506 * @hdr: A header that has had nfs_generic_pgio called
Anna Schumaker00bfa302014-05-06 09:12:29 -0400507 */
Trond Myklebusta70912a2017-09-08 21:28:11 -0400508static void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr)
Anna Schumaker00bfa302014-05-06 09:12:29 -0400509{
Trond Myklebust3caa0c62014-10-13 10:26:43 -0400510 if (hdr->args.context)
511 put_nfs_open_context(hdr->args.context);
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400512 if (hdr->page_array.pagevec != hdr->page_array.page_array)
513 kfree(hdr->page_array.pagevec);
Anna Schumaker00bfa302014-05-06 09:12:29 -0400514}
Trond Myklebusta70912a2017-09-08 21:28:11 -0400515
516/*
517 * nfs_pgio_header_free - Free a read or write header
518 * @hdr: The header to free
519 */
520void nfs_pgio_header_free(struct nfs_pgio_header *hdr)
521{
522 nfs_pgio_data_destroy(hdr);
523 hdr->rw_ops->rw_free_header(hdr);
524}
525EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
Anna Schumaker00bfa302014-05-06 09:12:29 -0400526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527/**
Anna Schumakerce595152014-05-06 09:12:34 -0400528 * nfs_pgio_rpcsetup - Set up arguments for a pageio call
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400529 * @hdr: The pageio hdr
Anna Schumakerce595152014-05-06 09:12:34 -0400530 * @count: Number of bytes to read
531 * @offset: Initial offset
532 * @how: How to commit data (writes only)
533 * @cinfo: Commit information for the call (writes only)
534 */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400535static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr,
Anna Schumakerce595152014-05-06 09:12:34 -0400536 unsigned int count, unsigned int offset,
537 int how, struct nfs_commit_info *cinfo)
538{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400539 struct nfs_page *req = hdr->req;
Anna Schumakerce595152014-05-06 09:12:34 -0400540
541 /* Set up the RPC argument and reply structs
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400542 * NB: take care not to mess about with hdr->commit et al. */
Anna Schumakerce595152014-05-06 09:12:34 -0400543
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400544 hdr->args.fh = NFS_FH(hdr->inode);
545 hdr->args.offset = req_offset(req) + offset;
Anna Schumakerce595152014-05-06 09:12:34 -0400546 /* pnfs_set_layoutcommit needs this */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400547 hdr->mds_offset = hdr->args.offset;
548 hdr->args.pgbase = req->wb_pgbase + offset;
549 hdr->args.pages = hdr->page_array.pagevec;
550 hdr->args.count = count;
551 hdr->args.context = get_nfs_open_context(req->wb_context);
552 hdr->args.lock_context = req->wb_lock_context;
553 hdr->args.stable = NFS_UNSTABLE;
Anna Schumakerce595152014-05-06 09:12:34 -0400554 switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
555 case 0:
556 break;
557 case FLUSH_COND_STABLE:
558 if (nfs_reqs_to_commit(cinfo))
559 break;
560 default:
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400561 hdr->args.stable = NFS_FILE_SYNC;
Anna Schumakerce595152014-05-06 09:12:34 -0400562 }
563
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400564 hdr->res.fattr = &hdr->fattr;
565 hdr->res.count = count;
566 hdr->res.eof = 0;
Weston Andros Adamsonc65e6252014-06-09 11:48:36 -0400567 hdr->res.verf = &hdr->verf;
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400568 nfs_fattr_init(&hdr->fattr);
Anna Schumakerce595152014-05-06 09:12:34 -0400569}
570
571/**
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400572 * nfs_pgio_prepare - Prepare pageio hdr to go over the wire
Anna Schumakera4cdda52014-05-06 09:12:31 -0400573 * @task: The current task
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400574 * @calldata: pageio header to prepare
Anna Schumakera4cdda52014-05-06 09:12:31 -0400575 */
Anna Schumaker6f92fa42014-05-06 09:12:33 -0400576static void nfs_pgio_prepare(struct rpc_task *task, void *calldata)
Anna Schumakera4cdda52014-05-06 09:12:31 -0400577{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400578 struct nfs_pgio_header *hdr = calldata;
Anna Schumakera4cdda52014-05-06 09:12:31 -0400579 int err;
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400580 err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr);
Anna Schumakera4cdda52014-05-06 09:12:31 -0400581 if (err)
582 rpc_exit(task, err);
583}
584
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400585int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
Peng Tao46a5ab42014-06-13 23:02:25 +0800586 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400587 const struct rpc_call_ops *call_ops, int how, int flags)
588{
589 struct rpc_task *task;
590 struct rpc_message msg = {
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400591 .rpc_argp = &hdr->args,
592 .rpc_resp = &hdr->res,
Peng Tao46a5ab42014-06-13 23:02:25 +0800593 .rpc_cred = cred,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400594 };
595 struct rpc_task_setup task_setup_data = {
596 .rpc_client = clnt,
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400597 .task = &hdr->task,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400598 .rpc_message = &msg,
599 .callback_ops = call_ops,
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400600 .callback_data = hdr,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400601 .workqueue = nfsiod_workqueue,
602 .flags = RPC_TASK_ASYNC | flags,
603 };
604 int ret = 0;
605
Tom Haynesabde71f2014-06-09 13:12:20 -0700606 hdr->rw_ops->rw_initiate(hdr, &msg, rpc_ops, &task_setup_data, how);
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400607
Kinglong Meeb4839eb2015-07-01 12:00:13 +0800608 dprintk("NFS: initiated pgio call "
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400609 "(req %s/%llu, %u bytes @ offset %llu)\n",
Anna Schumaker343ae532014-06-20 13:30:26 -0400610 hdr->inode->i_sb->s_id,
611 (unsigned long long)NFS_FILEID(hdr->inode),
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400612 hdr->args.count,
613 (unsigned long long)hdr->args.offset);
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400614
615 task = rpc_run_task(&task_setup_data);
616 if (IS_ERR(task)) {
617 ret = PTR_ERR(task);
618 goto out;
619 }
620 if (how & FLUSH_SYNC) {
621 ret = rpc_wait_for_completion_task(task);
622 if (ret == 0)
623 ret = task->tk_status;
624 }
625 rpc_put_task(task);
626out:
627 return ret;
628}
629EXPORT_SYMBOL_GPL(nfs_initiate_pgio);
630
Anna Schumakera4cdda52014-05-06 09:12:31 -0400631/**
Anna Schumaker844c9e62014-05-06 09:12:35 -0400632 * nfs_pgio_error - Clean up from a pageio error
633 * @desc: IO descriptor
634 * @hdr: pageio header
635 */
Peng Tao2bff2282015-12-05 02:03:17 +0800636static void nfs_pgio_error(struct nfs_pgio_header *hdr)
Anna Schumaker844c9e62014-05-06 09:12:35 -0400637{
Anna Schumaker844c9e62014-05-06 09:12:35 -0400638 set_bit(NFS_IOHDR_REDO, &hdr->flags);
Weston Andros Adamson4714fb52014-06-09 11:48:37 -0400639 hdr->completion_ops->completion(hdr);
Anna Schumaker844c9e62014-05-06 09:12:35 -0400640}
641
642/**
Anna Schumakera4cdda52014-05-06 09:12:31 -0400643 * nfs_pgio_release - Release pageio data
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400644 * @calldata: The pageio header to release
Anna Schumakera4cdda52014-05-06 09:12:31 -0400645 */
Anna Schumaker6f92fa42014-05-06 09:12:33 -0400646static void nfs_pgio_release(void *calldata)
Anna Schumakera4cdda52014-05-06 09:12:31 -0400647{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400648 struct nfs_pgio_header *hdr = calldata;
Weston Andros Adamson4714fb52014-06-09 11:48:37 -0400649 hdr->completion_ops->completion(hdr);
Anna Schumakera4cdda52014-05-06 09:12:31 -0400650}
651
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400652static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror,
653 unsigned int bsize)
654{
655 INIT_LIST_HEAD(&mirror->pg_list);
656 mirror->pg_bytes_written = 0;
657 mirror->pg_count = 0;
658 mirror->pg_bsize = bsize;
659 mirror->pg_base = 0;
660 mirror->pg_recoalesce = 0;
661}
662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663/**
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400664 * nfs_pageio_init - initialise a page io descriptor
665 * @desc: pointer to descriptor
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400666 * @inode: pointer to inode
Yijing Wangdfad7002015-06-18 19:37:13 +0800667 * @pg_ops: pointer to pageio operations
668 * @compl_ops: pointer to pageio completion operations
669 * @rw_ops: pointer to nfs read/write operations
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400670 * @bsize: io block size
671 * @io_flags: extra parameters for the io function
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400672 */
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400673void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
674 struct inode *inode,
Trond Myklebust1751c362011-06-10 13:30:23 -0400675 const struct nfs_pageio_ops *pg_ops,
Fred Isaman061ae2e2012-04-20 14:47:48 -0400676 const struct nfs_pgio_completion_ops *compl_ops,
Anna Schumaker4a0de552014-05-06 09:12:30 -0400677 const struct nfs_rw_ops *rw_ops,
Trond Myklebust84dde762007-05-04 14:44:06 -0400678 size_t bsize,
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400679 int io_flags)
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400680{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400681 struct nfs_pgio_mirror *new;
682 int i;
Benjamin Coddingtonf2b6f502017-04-19 10:11:33 -0400683 gfp_t gfp_flags = GFP_KERNEL;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400684
Trond Myklebustb31268a2011-03-21 17:02:00 -0400685 desc->pg_moreio = 0;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400686 desc->pg_inode = inode;
Trond Myklebust1751c362011-06-10 13:30:23 -0400687 desc->pg_ops = pg_ops;
Fred Isaman061ae2e2012-04-20 14:47:48 -0400688 desc->pg_completion_ops = compl_ops;
Anna Schumaker4a0de552014-05-06 09:12:30 -0400689 desc->pg_rw_ops = rw_ops;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400690 desc->pg_ioflags = io_flags;
691 desc->pg_error = 0;
Fred Isaman94ad1c82011-03-01 01:34:14 +0000692 desc->pg_lseg = NULL;
Fred Isaman584aa812012-04-20 14:47:51 -0400693 desc->pg_dreq = NULL;
Peng Taof6166382012-08-02 15:36:09 +0300694 desc->pg_layout_private = NULL;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400695 desc->pg_bsize = bsize;
696
697 desc->pg_mirror_count = 1;
698 desc->pg_mirror_idx = 0;
699
700 if (pg_ops->pg_get_mirror_count) {
701 /* until we have a request, we don't have an lseg and no
702 * idea how many mirrors there will be */
Benjamin Coddingtonf2b6f502017-04-19 10:11:33 -0400703 if (desc->pg_rw_ops->rw_mode == FMODE_WRITE)
704 gfp_flags = GFP_NOIO;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400705 new = kcalloc(NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX,
Benjamin Coddingtonf2b6f502017-04-19 10:11:33 -0400706 sizeof(struct nfs_pgio_mirror), gfp_flags);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400707 desc->pg_mirrors_dynamic = new;
708 desc->pg_mirrors = new;
709
710 for (i = 0; i < NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX; i++)
711 nfs_pageio_mirror_init(&desc->pg_mirrors[i], bsize);
712 } else {
713 desc->pg_mirrors_dynamic = NULL;
714 desc->pg_mirrors = desc->pg_mirrors_static;
715 nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize);
716 }
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400717}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400718EXPORT_SYMBOL_GPL(nfs_pageio_init);
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400719
Anna Schumaker0eecb212014-05-06 09:12:32 -0400720/**
721 * nfs_pgio_result - Basic pageio error handling
722 * @task: The task that ran
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400723 * @calldata: Pageio header to check
Anna Schumaker0eecb212014-05-06 09:12:32 -0400724 */
Anna Schumaker6f92fa42014-05-06 09:12:33 -0400725static void nfs_pgio_result(struct rpc_task *task, void *calldata)
Anna Schumaker0eecb212014-05-06 09:12:32 -0400726{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400727 struct nfs_pgio_header *hdr = calldata;
728 struct inode *inode = hdr->inode;
Anna Schumaker0eecb212014-05-06 09:12:32 -0400729
730 dprintk("NFS: %s: %5u, (status %d)\n", __func__,
731 task->tk_pid, task->tk_status);
732
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400733 if (hdr->rw_ops->rw_done(task, hdr, inode) != 0)
Anna Schumaker0eecb212014-05-06 09:12:32 -0400734 return;
735 if (task->tk_status < 0)
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400736 nfs_set_pgio_error(hdr, task->tk_status, hdr->args.offset);
Anna Schumaker0eecb212014-05-06 09:12:32 -0400737 else
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400738 hdr->rw_ops->rw_result(task, hdr);
Anna Schumaker0eecb212014-05-06 09:12:32 -0400739}
740
Anna Schumakeref2c4882014-05-06 09:12:36 -0400741/*
Anna Schumakeref2c4882014-05-06 09:12:36 -0400742 * Create an RPC task for the given read or write request and kick it.
743 * The page must have been locked by the caller.
744 *
745 * It may happen that the page we're passed is not marked dirty.
746 * This is the case if nfs_updatepage detects a conflicting request
747 * that has been written but not committed.
748 */
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400749int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
750 struct nfs_pgio_header *hdr)
Anna Schumakeref2c4882014-05-06 09:12:36 -0400751{
Peng Tao48d635f2014-11-10 08:35:35 +0800752 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400753
Anna Schumakeref2c4882014-05-06 09:12:36 -0400754 struct nfs_page *req;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400755 struct page **pages,
756 *last_page;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400757 struct list_head *head = &mirror->pg_list;
Anna Schumakeref2c4882014-05-06 09:12:36 -0400758 struct nfs_commit_info cinfo;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400759 unsigned int pagecount, pageused;
Benjamin Coddingtonf2b6f502017-04-19 10:11:33 -0400760 gfp_t gfp_flags = GFP_KERNEL;
Anna Schumakeref2c4882014-05-06 09:12:36 -0400761
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400762 pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count);
Benjamin Coddingtonf2b6f502017-04-19 10:11:33 -0400763 if (desc->pg_rw_ops->rw_mode == FMODE_WRITE)
764 gfp_flags = GFP_NOIO;
765 if (!nfs_pgarray_set(&hdr->page_array, pagecount, gfp_flags)) {
Peng Tao2bff2282015-12-05 02:03:17 +0800766 nfs_pgio_error(hdr);
767 desc->pg_error = -ENOMEM;
768 return desc->pg_error;
769 }
Anna Schumakeref2c4882014-05-06 09:12:36 -0400770
771 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400772 pages = hdr->page_array.pagevec;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400773 last_page = NULL;
774 pageused = 0;
Anna Schumakeref2c4882014-05-06 09:12:36 -0400775 while (!list_empty(head)) {
776 req = nfs_list_entry(head->next);
777 nfs_list_remove_request(req);
778 nfs_list_add_request(req, &hdr->pages);
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400779
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400780 if (!last_page || last_page != req->wb_page) {
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400781 pageused++;
Trond Myklebustb8fb9c302014-10-13 10:56:12 -0400782 if (pageused > pagecount)
783 break;
784 *pages++ = last_page = req->wb_page;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400785 }
Anna Schumakeref2c4882014-05-06 09:12:36 -0400786 }
Peng Tao2bff2282015-12-05 02:03:17 +0800787 if (WARN_ON_ONCE(pageused != pagecount)) {
788 nfs_pgio_error(hdr);
789 desc->pg_error = -EINVAL;
790 return desc->pg_error;
791 }
Anna Schumakeref2c4882014-05-06 09:12:36 -0400792
793 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
794 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
795 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
796
797 /* Set up the argument struct */
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400798 nfs_pgio_rpcsetup(hdr, mirror->pg_count, 0, desc->pg_ioflags, &cinfo);
Anna Schumakeref2c4882014-05-06 09:12:36 -0400799 desc->pg_rpc_callops = &nfs_pgio_common_ops;
800 return 0;
801}
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400802EXPORT_SYMBOL_GPL(nfs_generic_pgio);
Anna Schumakeref2c4882014-05-06 09:12:36 -0400803
Anna Schumaker41d8d5b2014-05-06 09:12:40 -0400804static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
Anna Schumakercf485fc2014-05-06 09:12:39 -0400805{
Anna Schumakercf485fc2014-05-06 09:12:39 -0400806 struct nfs_pgio_header *hdr;
807 int ret;
808
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400809 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
810 if (!hdr) {
Peng Tao2bff2282015-12-05 02:03:17 +0800811 desc->pg_error = -ENOMEM;
812 return desc->pg_error;
Anna Schumakercf485fc2014-05-06 09:12:39 -0400813 }
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400814 nfs_pgheader_init(desc, hdr, nfs_pgio_header_free);
Anna Schumakercf485fc2014-05-06 09:12:39 -0400815 ret = nfs_generic_pgio(desc, hdr);
816 if (ret == 0)
Weston Andros Adamson7f714722014-05-15 11:56:53 -0400817 ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode),
Peng Tao46a5ab42014-06-13 23:02:25 +0800818 hdr,
819 hdr->cred,
820 NFS_PROTO(hdr->inode),
Tom Haynesabde71f2014-06-09 13:12:20 -0700821 desc->pg_rpc_callops,
Weston Andros Adamson7f714722014-05-15 11:56:53 -0400822 desc->pg_ioflags, 0);
Anna Schumakercf485fc2014-05-06 09:12:39 -0400823 return ret;
824}
825
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400826/*
827 * nfs_pageio_setup_mirroring - determine if mirroring is to be used
828 * by calling the pg_get_mirror_count op
829 */
830static int nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio,
831 struct nfs_page *req)
832{
833 int mirror_count = 1;
834
835 if (!pgio->pg_ops->pg_get_mirror_count)
836 return 0;
837
838 mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req);
839
Peng Taod600ad12015-12-04 02:57:48 +0800840 if (pgio->pg_error < 0)
841 return pgio->pg_error;
842
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400843 if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX)
844 return -EINVAL;
845
846 if (WARN_ON_ONCE(!pgio->pg_mirrors_dynamic))
847 return -EINVAL;
848
849 pgio->pg_mirror_count = mirror_count;
850
851 return 0;
852}
853
854/*
855 * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1)
856 */
857void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio)
858{
859 pgio->pg_mirror_count = 1;
860 pgio->pg_mirror_idx = 0;
861}
862
863static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio)
864{
865 pgio->pg_mirror_count = 1;
866 pgio->pg_mirror_idx = 0;
867 pgio->pg_mirrors = pgio->pg_mirrors_static;
868 kfree(pgio->pg_mirrors_dynamic);
869 pgio->pg_mirrors_dynamic = NULL;
870}
871
Trond Myklebust4109bb72013-09-06 11:09:38 -0400872static bool nfs_match_lock_context(const struct nfs_lock_context *l1,
873 const struct nfs_lock_context *l2)
874{
875 return l1->lockowner.l_owner == l2->lockowner.l_owner
876 && l1->lockowner.l_pid == l2->lockowner.l_pid;
877}
878
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400879/**
880 * nfs_can_coalesce_requests - test two requests for compatibility
881 * @prev: pointer to nfs_page
882 * @req: pointer to nfs_page
883 *
884 * The nfs_page structures 'prev' and 'req' are compared to ensure that the
885 * page data area they describe is contiguous, and that their RPC
886 * credentials, NFSv4 open state, and lockowners are the same.
887 *
888 * Return 'true' if this is the case, else return 'false'.
889 */
Benny Halevy18ad0a92011-05-25 21:03:56 +0300890static bool nfs_can_coalesce_requests(struct nfs_page *prev,
891 struct nfs_page *req,
892 struct nfs_pageio_descriptor *pgio)
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400893{
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400894 size_t size;
Jeff Layton5263e312015-01-16 15:05:55 -0500895 struct file_lock_context *flctx;
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400896
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400897 if (prev) {
898 if (!nfs_match_open_context(req->wb_context, prev->wb_context))
899 return false;
David Howells2b0143b2015-03-17 22:25:59 +0000900 flctx = d_inode(req->wb_context->dentry)->i_flctx;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500901 if (flctx != NULL &&
902 !(list_empty_careful(&flctx->flc_posix) &&
903 list_empty_careful(&flctx->flc_flock)) &&
Jeff Layton5263e312015-01-16 15:05:55 -0500904 !nfs_match_lock_context(req->wb_lock_context,
905 prev->wb_lock_context))
906 return false;
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400907 if (req_offset(req) != req_offset(prev) + prev->wb_bytes)
908 return false;
Weston Andros Adamson78270e82014-08-14 17:39:33 -0400909 if (req->wb_page == prev->wb_page) {
910 if (req->wb_pgbase != prev->wb_pgbase + prev->wb_bytes)
911 return false;
912 } else {
913 if (req->wb_pgbase != 0 ||
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300914 prev->wb_pgbase + prev->wb_bytes != PAGE_SIZE)
Weston Andros Adamson78270e82014-08-14 17:39:33 -0400915 return false;
916 }
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400917 }
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400918 size = pgio->pg_ops->pg_test(pgio, prev, req);
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400919 WARN_ON_ONCE(size > req->wb_bytes);
920 if (size && size < req->wb_bytes)
921 req->wb_bytes = size;
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400922 return size > 0;
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400923}
924
925/**
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400926 * nfs_pageio_do_add_request - Attempt to coalesce a request into a page list.
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400927 * @desc: destination io descriptor
928 * @req: request
929 *
930 * Returns true if the request 'req' was successfully coalesced into the
931 * existing list of pages 'desc'.
932 */
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400933static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
934 struct nfs_page *req)
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400935{
Peng Tao48d635f2014-11-10 08:35:35 +0800936 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400937
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400938 struct nfs_page *prev = NULL;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400939
940 if (mirror->pg_count != 0) {
941 prev = nfs_list_entry(mirror->pg_list.prev);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300942 } else {
Trond Myklebustd8007d42011-06-10 13:30:23 -0400943 if (desc->pg_ops->pg_init)
944 desc->pg_ops->pg_init(desc, req);
Peng Taod600ad12015-12-04 02:57:48 +0800945 if (desc->pg_error < 0)
946 return 0;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400947 mirror->pg_base = req->wb_pgbase;
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300948 }
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400949 if (!nfs_can_coalesce_requests(prev, req, desc))
950 return 0;
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400951 nfs_list_remove_request(req);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400952 nfs_list_add_request(req, &mirror->pg_list);
953 mirror->pg_count += req->wb_bytes;
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400954 return 1;
955}
956
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400957/*
958 * Helper for nfs_pageio_add_request and nfs_pageio_complete
959 */
960static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
961{
Peng Tao48d635f2014-11-10 08:35:35 +0800962 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400963
964
965 if (!list_empty(&mirror->pg_list)) {
Trond Myklebust1751c362011-06-10 13:30:23 -0400966 int error = desc->pg_ops->pg_doio(desc);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400967 if (error < 0)
968 desc->pg_error = error;
969 else
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400970 mirror->pg_bytes_written += mirror->pg_count;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400971 }
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400972 if (list_empty(&mirror->pg_list)) {
973 mirror->pg_count = 0;
974 mirror->pg_base = 0;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400975 }
976}
977
978/**
979 * nfs_pageio_add_request - Attempt to coalesce a request into a page list.
980 * @desc: destination io descriptor
981 * @req: request
982 *
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400983 * This may split a request into subrequests which are all part of the
984 * same page group.
985 *
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400986 * Returns true if the request 'req' was successfully coalesced into the
987 * existing list of pages 'desc'.
988 */
Trond Myklebustd9156f92011-07-12 13:42:02 -0400989static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
Trond Myklebust8b09bee2007-04-02 18:48:28 -0400990 struct nfs_page *req)
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400991{
Peng Tao48d635f2014-11-10 08:35:35 +0800992 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400993
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400994 struct nfs_page *subreq;
995 unsigned int bytes_left = 0;
996 unsigned int offset, pgbase;
997
Weston Andros Adamsonbfd484a2014-08-08 11:00:55 -0400998 nfs_page_group_lock(req, false);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400999
1000 subreq = req;
1001 bytes_left = subreq->wb_bytes;
1002 offset = subreq->wb_offset;
1003 pgbase = subreq->wb_pgbase;
1004
1005 do {
1006 if (!nfs_pageio_do_add_request(desc, subreq)) {
1007 /* make sure pg_test call(s) did nothing */
1008 WARN_ON_ONCE(subreq->wb_bytes != bytes_left);
1009 WARN_ON_ONCE(subreq->wb_offset != offset);
1010 WARN_ON_ONCE(subreq->wb_pgbase != pgbase);
1011
1012 nfs_page_group_unlock(req);
1013 desc->pg_moreio = 1;
1014 nfs_pageio_doio(desc);
1015 if (desc->pg_error < 0)
1016 return 0;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001017 if (mirror->pg_recoalesce)
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001018 return 0;
1019 /* retry add_request for this subreq */
Weston Andros Adamsonbfd484a2014-08-08 11:00:55 -04001020 nfs_page_group_lock(req, false);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001021 continue;
1022 }
1023
1024 /* check for buggy pg_test call(s) */
1025 WARN_ON_ONCE(subreq->wb_bytes + subreq->wb_pgbase > PAGE_SIZE);
1026 WARN_ON_ONCE(subreq->wb_bytes > bytes_left);
1027 WARN_ON_ONCE(subreq->wb_bytes == 0);
1028
1029 bytes_left -= subreq->wb_bytes;
1030 offset += subreq->wb_bytes;
1031 pgbase += subreq->wb_bytes;
1032
1033 if (bytes_left) {
1034 subreq = nfs_create_request(req->wb_context,
1035 req->wb_page,
1036 subreq, pgbase, bytes_left);
Trond Myklebustc1109552014-05-29 11:38:15 -04001037 if (IS_ERR(subreq))
1038 goto err_ptr;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001039 nfs_lock_request(subreq);
1040 subreq->wb_offset = offset;
1041 subreq->wb_index = req->wb_index;
1042 }
1043 } while (bytes_left > 0);
1044
1045 nfs_page_group_unlock(req);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001046 return 1;
Trond Myklebustc1109552014-05-29 11:38:15 -04001047err_ptr:
1048 desc->pg_error = PTR_ERR(subreq);
1049 nfs_page_group_unlock(req);
1050 return 0;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001051}
1052
Trond Myklebustd9156f92011-07-12 13:42:02 -04001053static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
1054{
Peng Tao48d635f2014-11-10 08:35:35 +08001055 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Trond Myklebustd9156f92011-07-12 13:42:02 -04001056 LIST_HEAD(head);
1057
1058 do {
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001059 list_splice_init(&mirror->pg_list, &head);
1060 mirror->pg_bytes_written -= mirror->pg_count;
1061 mirror->pg_count = 0;
1062 mirror->pg_base = 0;
1063 mirror->pg_recoalesce = 0;
1064
Trond Myklebustd9156f92011-07-12 13:42:02 -04001065 while (!list_empty(&head)) {
1066 struct nfs_page *req;
1067
1068 req = list_first_entry(&head, struct nfs_page, wb_list);
1069 nfs_list_remove_request(req);
1070 if (__nfs_pageio_add_request(desc, req))
1071 continue;
Trond Myklebust03d5eb62015-07-27 10:23:19 -04001072 if (desc->pg_error < 0) {
1073 list_splice_tail(&head, &mirror->pg_list);
1074 mirror->pg_recoalesce = 1;
Trond Myklebustd9156f92011-07-12 13:42:02 -04001075 return 0;
Trond Myklebust03d5eb62015-07-27 10:23:19 -04001076 }
Trond Myklebustd9156f92011-07-12 13:42:02 -04001077 break;
1078 }
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001079 } while (mirror->pg_recoalesce);
Trond Myklebustd9156f92011-07-12 13:42:02 -04001080 return 1;
1081}
1082
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001083static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc,
Trond Myklebustd9156f92011-07-12 13:42:02 -04001084 struct nfs_page *req)
1085{
1086 int ret;
1087
1088 do {
1089 ret = __nfs_pageio_add_request(desc, req);
1090 if (ret)
1091 break;
1092 if (desc->pg_error < 0)
1093 break;
1094 ret = nfs_do_recoalesce(desc);
1095 } while (ret);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001096
Trond Myklebustd9156f92011-07-12 13:42:02 -04001097 return ret;
1098}
1099
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001100int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
1101 struct nfs_page *req)
1102{
1103 u32 midx;
1104 unsigned int pgbase, offset, bytes;
1105 struct nfs_page *dupreq, *lastreq;
1106
1107 pgbase = req->wb_pgbase;
1108 offset = req->wb_offset;
1109 bytes = req->wb_bytes;
1110
1111 nfs_pageio_setup_mirroring(desc, req);
Peng Taod600ad12015-12-04 02:57:48 +08001112 if (desc->pg_error < 0)
Peng Taoc18b96a2015-12-05 01:59:56 +08001113 goto out_failed;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001114
1115 for (midx = 0; midx < desc->pg_mirror_count; midx++) {
1116 if (midx) {
1117 nfs_page_group_lock(req, false);
1118
1119 /* find the last request */
1120 for (lastreq = req->wb_head;
1121 lastreq->wb_this_page != req->wb_head;
1122 lastreq = lastreq->wb_this_page)
1123 ;
1124
1125 dupreq = nfs_create_request(req->wb_context,
1126 req->wb_page, lastreq, pgbase, bytes);
1127
1128 if (IS_ERR(dupreq)) {
1129 nfs_page_group_unlock(req);
Peng Taoc18b96a2015-12-05 01:59:56 +08001130 desc->pg_error = PTR_ERR(dupreq);
1131 goto out_failed;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001132 }
1133
1134 nfs_lock_request(dupreq);
1135 nfs_page_group_unlock(req);
1136 dupreq->wb_offset = offset;
1137 dupreq->wb_index = req->wb_index;
1138 } else
1139 dupreq = req;
1140
Peng Tao47af81f2014-11-10 08:35:34 +08001141 if (nfs_pgio_has_mirroring(desc))
1142 desc->pg_mirror_idx = midx;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001143 if (!nfs_pageio_add_request_mirror(desc, dupreq))
Peng Taoc18b96a2015-12-05 01:59:56 +08001144 goto out_failed;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001145 }
1146
1147 return 1;
Peng Taoc18b96a2015-12-05 01:59:56 +08001148
1149out_failed:
1150 /*
1151 * We might have failed before sending any reqs over wire.
Peng Tao2bff2282015-12-05 02:03:17 +08001152 * Clean up rest of the reqs in mirror pg_list.
Peng Taoc18b96a2015-12-05 01:59:56 +08001153 */
Peng Tao2bff2282015-12-05 02:03:17 +08001154 if (desc->pg_error) {
1155 struct nfs_pgio_mirror *mirror;
1156 void (*func)(struct list_head *);
1157
1158 /* remember fatal errors */
1159 if (nfs_error_is_fatal(desc->pg_error))
1160 mapping_set_error(desc->pg_inode->i_mapping,
1161 desc->pg_error);
1162
1163 func = desc->pg_completion_ops->error_cleanup;
1164 for (midx = 0; midx < desc->pg_mirror_count; midx++) {
1165 mirror = &desc->pg_mirrors[midx];
1166 func(&mirror->pg_list);
1167 }
1168 }
Peng Taoc18b96a2015-12-05 01:59:56 +08001169 return 0;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001170}
1171
1172/*
1173 * nfs_pageio_complete_mirror - Complete I/O on the current mirror of an
1174 * nfs_pageio_descriptor
1175 * @desc: pointer to io descriptor
Yijing Wangdfad7002015-06-18 19:37:13 +08001176 * @mirror_idx: pointer to mirror index
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001177 */
1178static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
1179 u32 mirror_idx)
1180{
1181 struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx];
1182 u32 restore_idx = desc->pg_mirror_idx;
1183
Peng Tao47af81f2014-11-10 08:35:34 +08001184 if (nfs_pgio_has_mirroring(desc))
1185 desc->pg_mirror_idx = mirror_idx;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001186 for (;;) {
1187 nfs_pageio_doio(desc);
1188 if (!mirror->pg_recoalesce)
1189 break;
1190 if (!nfs_do_recoalesce(desc))
1191 break;
1192 }
1193 desc->pg_mirror_idx = restore_idx;
1194}
1195
Weston Andros Adamson53113ad2014-06-09 11:48:38 -04001196/*
1197 * nfs_pageio_resend - Transfer requests to new descriptor and resend
1198 * @hdr - the pgio header to move request from
1199 * @desc - the pageio descriptor to add requests to
1200 *
1201 * Try to move each request (nfs_page) from @hdr to @desc then attempt
1202 * to send them.
1203 *
1204 * Returns 0 on success and < 0 on error.
1205 */
1206int nfs_pageio_resend(struct nfs_pageio_descriptor *desc,
1207 struct nfs_pgio_header *hdr)
1208{
1209 LIST_HEAD(failed);
1210
1211 desc->pg_dreq = hdr->dreq;
1212 while (!list_empty(&hdr->pages)) {
1213 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
1214
1215 nfs_list_remove_request(req);
1216 if (!nfs_pageio_add_request(desc, req))
1217 nfs_list_add_request(req, &failed);
1218 }
1219 nfs_pageio_complete(desc);
1220 if (!list_empty(&failed)) {
1221 list_move(&failed, &hdr->pages);
Peng Taod600ad12015-12-04 02:57:48 +08001222 return desc->pg_error < 0 ? desc->pg_error : -EIO;
Weston Andros Adamson53113ad2014-06-09 11:48:38 -04001223 }
1224 return 0;
1225}
1226EXPORT_SYMBOL_GPL(nfs_pageio_resend);
Trond Myklebustd8a5ad72007-04-02 18:48:28 -04001227
1228/**
Weston Andros Adamson2176bf42014-09-10 15:44:18 -04001229 * nfs_pageio_complete - Complete I/O then cleanup an nfs_pageio_descriptor
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001230 * @desc: pointer to io descriptor
1231 */
1232void nfs_pageio_complete(struct nfs_pageio_descriptor *desc)
1233{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001234 u32 midx;
1235
1236 for (midx = 0; midx < desc->pg_mirror_count; midx++)
1237 nfs_pageio_complete_mirror(desc, midx);
Weston Andros Adamson2176bf42014-09-10 15:44:18 -04001238
1239 if (desc->pg_ops->pg_cleanup)
1240 desc->pg_ops->pg_cleanup(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001241 nfs_pageio_cleanup_mirroring(desc);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001242}
1243
Trond Myklebust7fe7f842007-05-20 10:18:27 -04001244/**
1245 * nfs_pageio_cond_complete - Conditional I/O completion
1246 * @desc: pointer to io descriptor
1247 * @index: page index
1248 *
1249 * It is important to ensure that processes don't try to take locks
1250 * on non-contiguous ranges of pages as that might deadlock. This
1251 * function should be called before attempting to wait on a locked
1252 * nfs_page. It will complete the I/O if the page index 'index'
1253 * is not contiguous with the existing list of pages in 'desc'.
1254 */
1255void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
1256{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001257 struct nfs_pgio_mirror *mirror;
1258 struct nfs_page *prev;
1259 u32 midx;
1260
1261 for (midx = 0; midx < desc->pg_mirror_count; midx++) {
1262 mirror = &desc->pg_mirrors[midx];
1263 if (!list_empty(&mirror->pg_list)) {
1264 prev = nfs_list_entry(mirror->pg_list.prev);
1265 if (index != prev->wb_index + 1)
1266 nfs_pageio_complete_mirror(desc, midx);
1267 }
Trond Myklebust7fe7f842007-05-20 10:18:27 -04001268 }
1269}
1270
David Howellsf7b422b2006-06-09 09:34:33 -04001271int __init nfs_init_nfspagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272{
1273 nfs_page_cachep = kmem_cache_create("nfs_page",
1274 sizeof(struct nfs_page),
1275 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001276 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 if (nfs_page_cachep == NULL)
1278 return -ENOMEM;
1279
1280 return 0;
1281}
1282
David Brownell266bee82006-06-27 12:59:15 -07001283void nfs_destroy_nfspagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001285 kmem_cache_destroy(nfs_page_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286}
1287
Anna Schumakeref2c4882014-05-06 09:12:36 -04001288static const struct rpc_call_ops nfs_pgio_common_ops = {
Anna Schumaker6f92fa42014-05-06 09:12:33 -04001289 .rpc_call_prepare = nfs_pgio_prepare,
1290 .rpc_call_done = nfs_pgio_result,
1291 .rpc_release = nfs_pgio_release,
1292};
Anna Schumaker41d8d5b2014-05-06 09:12:40 -04001293
1294const struct nfs_pageio_ops nfs_pgio_rw_ops = {
1295 .pg_test = nfs_generic_pg_test,
1296 .pg_doio = nfs_generic_pg_pgios,
1297};