blob: 282b3936951060a2c8a6216c4c690e166a5fcb8d [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
Anna Schumaker00bfa302014-05-06 09:12:29 -040032static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
Fred Isaman30dd3742012-04-20 14:47:45 -040033{
34 p->npages = pagecount;
35 if (pagecount <= ARRAY_SIZE(p->page_array))
36 p->pagevec = p->page_array;
37 else {
38 p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
39 if (!p->pagevec)
40 p->npages = 0;
41 }
42 return p->pagevec != NULL;
43}
44
Peng Tao48d635f2014-11-10 08:35:35 +080045struct nfs_pgio_mirror *
46nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc)
47{
48 return nfs_pgio_has_mirroring(desc) ?
49 &desc->pg_mirrors[desc->pg_mirror_idx] :
50 &desc->pg_mirrors[0];
51}
52EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror);
53
Fred Isaman4db6e0b2012-04-20 14:47:46 -040054void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
55 struct nfs_pgio_header *hdr,
56 void (*release)(struct nfs_pgio_header *hdr))
57{
Peng Tao48d635f2014-11-10 08:35:35 +080058 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -040059
60
61 hdr->req = nfs_list_entry(mirror->pg_list.next);
Fred Isaman4db6e0b2012-04-20 14:47:46 -040062 hdr->inode = desc->pg_inode;
63 hdr->cred = hdr->req->wb_context->cred;
64 hdr->io_start = req_offset(hdr->req);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -040065 hdr->good_bytes = mirror->pg_count;
Fred Isaman584aa812012-04-20 14:47:51 -040066 hdr->dreq = desc->pg_dreq;
Peng Taof6166382012-08-02 15:36:09 +030067 hdr->layout_private = desc->pg_layout_private;
Fred Isaman4db6e0b2012-04-20 14:47:46 -040068 hdr->release = release;
Fred Isaman061ae2e2012-04-20 14:47:48 -040069 hdr->completion_ops = desc->pg_completion_ops;
Fred Isaman584aa812012-04-20 14:47:51 -040070 if (hdr->completion_ops->init_hdr)
71 hdr->completion_ops->init_hdr(hdr);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -040072
73 hdr->pgio_mirror_idx = desc->pg_mirror_idx;
Fred Isaman4db6e0b2012-04-20 14:47:46 -040074}
Bryan Schumaker89d77c82012-07-30 16:05:25 -040075EXPORT_SYMBOL_GPL(nfs_pgheader_init);
Fred Isaman4db6e0b2012-04-20 14:47:46 -040076
77void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos)
78{
79 spin_lock(&hdr->lock);
80 if (pos < hdr->io_start + hdr->good_bytes) {
81 set_bit(NFS_IOHDR_ERROR, &hdr->flags);
82 clear_bit(NFS_IOHDR_EOF, &hdr->flags);
83 hdr->good_bytes = pos - hdr->io_start;
84 hdr->error = error;
85 }
86 spin_unlock(&hdr->lock);
87}
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089static inline struct nfs_page *
90nfs_page_alloc(void)
91{
Mel Gorman192e5012012-07-31 16:45:16 -070092 struct nfs_page *p = kmem_cache_zalloc(nfs_page_cachep, GFP_NOIO);
Jesper Juhl72895b12010-12-09 23:17:15 +010093 if (p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 INIT_LIST_HEAD(&p->wb_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 return p;
96}
97
98static inline void
99nfs_page_free(struct nfs_page *p)
100{
101 kmem_cache_free(nfs_page_cachep, p);
102}
103
Trond Myklebust577b4232013-04-08 21:38:12 -0400104static void
105nfs_iocounter_inc(struct nfs_io_counter *c)
106{
107 atomic_inc(&c->io_count);
108}
109
110static void
111nfs_iocounter_dec(struct nfs_io_counter *c)
112{
113 if (atomic_dec_and_test(&c->io_count)) {
114 clear_bit(NFS_IO_INPROGRESS, &c->flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100115 smp_mb__after_atomic();
Trond Myklebust577b4232013-04-08 21:38:12 -0400116 wake_up_bit(&c->flags, NFS_IO_INPROGRESS);
117 }
118}
119
120static int
121__nfs_iocounter_wait(struct nfs_io_counter *c)
122{
123 wait_queue_head_t *wq = bit_waitqueue(&c->flags, NFS_IO_INPROGRESS);
124 DEFINE_WAIT_BIT(q, &c->flags, NFS_IO_INPROGRESS);
125 int ret = 0;
126
127 do {
128 prepare_to_wait(wq, &q.wait, TASK_KILLABLE);
129 set_bit(NFS_IO_INPROGRESS, &c->flags);
130 if (atomic_read(&c->io_count) == 0)
131 break;
NeilBrownc1221322014-07-07 15:16:04 +1000132 ret = nfs_wait_bit_killable(&q.key);
David Jeffery92a56552014-08-05 11:19:42 -0400133 } while (atomic_read(&c->io_count) != 0 && !ret);
Trond Myklebust577b4232013-04-08 21:38:12 -0400134 finish_wait(wq, &q.wait);
135 return ret;
136}
137
138/**
139 * nfs_iocounter_wait - wait for i/o to complete
140 * @c: nfs_io_counter to use
141 *
142 * returns -ERESTARTSYS if interrupted by a fatal signal.
143 * Otherwise returns 0 once the io_count hits 0.
144 */
145int
146nfs_iocounter_wait(struct nfs_io_counter *c)
147{
148 if (atomic_read(&c->io_count) == 0)
149 return 0;
150 return __nfs_iocounter_wait(c);
151}
152
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400153/*
154 * nfs_page_group_lock - lock the head of the page group
155 * @req - request in group that is to be locked
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400156 * @nonblock - if true don't block waiting for lock
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400157 *
158 * this lock must be held if modifying the page group list
Weston Andros Adamsone7029202014-07-17 20:42:15 -0400159 *
Weston Andros Adamsonbc8a3092014-08-08 11:00:54 -0400160 * return 0 on success, < 0 on error: -EDELAY if nonblocking or the
161 * result from wait_on_bit_lock
162 *
163 * NOTE: calling with nonblock=false should always have set the
164 * lock bit (see fs/buffer.c and other uses of wait_on_bit_lock
165 * with TASK_UNINTERRUPTIBLE), so there is no need to check the result.
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400166 */
Weston Andros Adamsone7029202014-07-17 20:42:15 -0400167int
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400168nfs_page_group_lock(struct nfs_page *req, bool nonblock)
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400169{
170 struct nfs_page *head = req->wb_head;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400171
172 WARN_ON_ONCE(head != head->wb_head);
173
Weston Andros Adamsonbc8a3092014-08-08 11:00:54 -0400174 if (!test_and_set_bit(PG_HEADLOCK, &head->wb_flags))
175 return 0;
Weston Andros Adamsone7029202014-07-17 20:42:15 -0400176
Weston Andros Adamsonbc8a3092014-08-08 11:00:54 -0400177 if (!nonblock)
178 return wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK,
179 TASK_UNINTERRUPTIBLE);
180
181 return -EAGAIN;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400182}
183
184/*
Weston Andros Adamson7c3af972014-08-08 11:00:57 -0400185 * nfs_page_group_lock_wait - wait for the lock to clear, but don't grab it
186 * @req - a request in the group
187 *
188 * This is a blocking call to wait for the group lock to be cleared.
189 */
190void
191nfs_page_group_lock_wait(struct nfs_page *req)
192{
193 struct nfs_page *head = req->wb_head;
194
195 WARN_ON_ONCE(head != head->wb_head);
196
197 wait_on_bit(&head->wb_flags, PG_HEADLOCK,
198 TASK_UNINTERRUPTIBLE);
199}
200
201/*
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400202 * nfs_page_group_unlock - unlock the head of the page group
203 * @req - request in group that is to be unlocked
204 */
205void
206nfs_page_group_unlock(struct nfs_page *req)
207{
208 struct nfs_page *head = req->wb_head;
209
210 WARN_ON_ONCE(head != head->wb_head);
211
Linus Torvaldsd1e1cda2014-06-10 15:02:42 -0700212 smp_mb__before_atomic();
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400213 clear_bit(PG_HEADLOCK, &head->wb_flags);
Linus Torvaldsd1e1cda2014-06-10 15:02:42 -0700214 smp_mb__after_atomic();
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400215 wake_up_bit(&head->wb_flags, PG_HEADLOCK);
216}
217
218/*
219 * nfs_page_group_sync_on_bit_locked
220 *
221 * must be called with page group lock held
222 */
223static bool
224nfs_page_group_sync_on_bit_locked(struct nfs_page *req, unsigned int bit)
225{
226 struct nfs_page *head = req->wb_head;
227 struct nfs_page *tmp;
228
229 WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_flags));
230 WARN_ON_ONCE(test_and_set_bit(bit, &req->wb_flags));
231
232 tmp = req->wb_this_page;
233 while (tmp != req) {
234 if (!test_bit(bit, &tmp->wb_flags))
235 return false;
236 tmp = tmp->wb_this_page;
237 }
238
239 /* true! reset all bits */
240 tmp = req;
241 do {
242 clear_bit(bit, &tmp->wb_flags);
243 tmp = tmp->wb_this_page;
244 } while (tmp != req);
245
246 return true;
247}
248
249/*
250 * nfs_page_group_sync_on_bit - set bit on current request, but only
251 * return true if the bit is set for all requests in page group
252 * @req - request in page group
253 * @bit - PG_* bit that is used to sync page group
254 */
255bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit)
256{
257 bool ret;
258
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400259 nfs_page_group_lock(req, false);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400260 ret = nfs_page_group_sync_on_bit_locked(req, bit);
261 nfs_page_group_unlock(req);
262
263 return ret;
264}
265
266/*
267 * nfs_page_group_init - Initialize the page group linkage for @req
268 * @req - a new nfs request
269 * @prev - the previous request in page group, or NULL if @req is the first
270 * or only request in the group (the head).
271 */
272static inline void
273nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev)
274{
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500275 struct inode *inode;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400276 WARN_ON_ONCE(prev == req);
277
278 if (!prev) {
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400279 /* a head request */
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400280 req->wb_head = req;
281 req->wb_this_page = req;
282 } else {
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400283 /* a subrequest */
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400284 WARN_ON_ONCE(prev->wb_this_page != prev->wb_head);
285 WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags));
286 req->wb_head = prev->wb_head;
287 req->wb_this_page = prev->wb_this_page;
288 prev->wb_this_page = req;
289
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400290 /* All subrequests take a ref on the head request until
291 * nfs_page_group_destroy is called */
292 kref_get(&req->wb_head->wb_kref);
293
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500294 /* grab extra ref and bump the request count if head request
295 * has extra ref from the write/commit path to handle handoff
296 * between write and commit lists. */
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400297 if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) {
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500298 inode = page_file_mapping(req->wb_page)->host;
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400299 set_bit(PG_INODE_REF, &req->wb_flags);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400300 kref_get(&req->wb_kref);
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -0500301 spin_lock(&inode->i_lock);
302 NFS_I(inode)->nrequests++;
303 spin_unlock(&inode->i_lock);
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400304 }
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400305 }
306}
307
308/*
309 * nfs_page_group_destroy - sync the destruction of page groups
310 * @req - request that no longer needs the page group
311 *
312 * releases the page group reference from each member once all
313 * members have called this function.
314 */
315static void
316nfs_page_group_destroy(struct kref *kref)
317{
318 struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref);
319 struct nfs_page *tmp, *next;
320
Weston Andros Adamson85710a82014-07-11 10:20:46 -0400321 /* subrequests must release the ref on the head request */
322 if (req->wb_head != req)
323 nfs_release_request(req->wb_head);
324
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400325 if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN))
326 return;
327
328 tmp = req;
329 do {
330 next = tmp->wb_this_page;
331 /* unlink and free */
332 tmp->wb_this_page = tmp;
333 tmp->wb_head = tmp;
334 nfs_free_request(tmp);
335 tmp = next;
336 } while (tmp != req);
337}
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339/**
340 * nfs_create_request - Create an NFS read/write request.
Chuck Leverc02f5572011-10-25 12:17:43 -0400341 * @ctx: open context to use
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 * @page: page to write
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400343 * @last: last nfs request created for this page group or NULL if head
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 * @offset: starting offset within the page for the write
345 * @count: number of bytes to read/write
346 *
347 * The page must be locked by the caller. This makes sure we never
Jason Uhlenkotta19b89c2007-04-26 17:25:51 -0700348 * create two different requests for the same page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 * User should ensure it is safe to sleep in this function.
350 */
351struct nfs_page *
Weston Andros Adamson8c8f1ac12014-05-15 11:56:42 -0400352nfs_create_request(struct nfs_open_context *ctx, struct page *page,
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400353 struct nfs_page *last, unsigned int offset,
354 unsigned int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 struct nfs_page *req;
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400357 struct nfs_lock_context *l_ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Trond Myklebustc58c8442013-03-18 19:45:14 -0400359 if (test_bit(NFS_CONTEXT_BAD, &ctx->flags))
360 return ERR_PTR(-EBADF);
Trond Myklebust18eb8842010-05-13 12:51:02 -0400361 /* try to allocate the request struct */
362 req = nfs_page_alloc();
363 if (req == NULL)
364 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Jeff Layton015f0212010-10-28 10:10:37 -0400366 /* get lock context early so we can deal with alloc failures */
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400367 l_ctx = nfs_get_lock_context(ctx);
368 if (IS_ERR(l_ctx)) {
Jeff Layton015f0212010-10-28 10:10:37 -0400369 nfs_page_free(req);
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400370 return ERR_CAST(l_ctx);
Jeff Layton015f0212010-10-28 10:10:37 -0400371 }
Trond Myklebustb3c54de2012-08-13 17:15:50 -0400372 req->wb_lock_context = l_ctx;
Trond Myklebust577b4232013-04-08 21:38:12 -0400373 nfs_iocounter_inc(&l_ctx->io_count);
Jeff Layton015f0212010-10-28 10:10:37 -0400374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 /* Initialize the request struct. Initially, we assume a
376 * long write-back delay. This will be adjusted in
377 * update_nfs_request below if the region is not locked. */
378 req->wb_page = page;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700379 req->wb_index = page_file_index(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 page_cache_get(page);
381 req->wb_offset = offset;
382 req->wb_pgbase = offset;
383 req->wb_bytes = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 req->wb_context = get_nfs_open_context(ctx);
Trond Myklebustc03b4022007-06-17 13:26:38 -0400385 kref_init(&req->wb_kref);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400386 nfs_page_group_init(req, last);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 return req;
388}
389
390/**
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400391 * nfs_unlock_request - Unlock request and wake up sleepers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 * @req:
393 */
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400394void nfs_unlock_request(struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396 if (!NFS_WBACK_BUSY(req)) {
397 printk(KERN_ERR "NFS: Invalid unlock attempted\n");
398 BUG();
399 }
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100400 smp_mb__before_atomic();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 clear_bit(PG_BUSY, &req->wb_flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100402 smp_mb__after_atomic();
Trond Myklebust464a98b2005-06-22 17:16:21 +0000403 wake_up_bit(&req->wb_flags, PG_BUSY);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400404}
405
406/**
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400407 * nfs_unlock_and_release_request - Unlock request and release the nfs_page
408 * @req:
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400409 */
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400410void nfs_unlock_and_release_request(struct nfs_page *req)
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400411{
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400412 nfs_unlock_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 nfs_release_request(req);
414}
415
Trond Myklebust4d65c522011-03-25 14:15:11 -0400416/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 * nfs_clear_request - Free up all resources allocated to the request
418 * @req:
419 *
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500420 * Release page and open context resources associated with a read/write
421 * request after it has completed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 */
Trond Myklebust4d65c522011-03-25 14:15:11 -0400423static void nfs_clear_request(struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500425 struct page *page = req->wb_page;
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500426 struct nfs_open_context *ctx = req->wb_context;
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400427 struct nfs_lock_context *l_ctx = req->wb_lock_context;
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500428
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500429 if (page != NULL) {
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500430 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 req->wb_page = NULL;
432 }
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400433 if (l_ctx != NULL) {
Trond Myklebust577b4232013-04-08 21:38:12 -0400434 nfs_iocounter_dec(&l_ctx->io_count);
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400435 nfs_put_lock_context(l_ctx);
436 req->wb_lock_context = NULL;
437 }
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500438 if (ctx != NULL) {
439 put_nfs_open_context(ctx);
440 req->wb_context = NULL;
441 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442}
443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444/**
445 * nfs_release_request - Release the count on an NFS read/write request
446 * @req: request to release
447 *
448 * Note: Should never be called with the spinlock held!
449 */
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400450void nfs_free_request(struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400452 WARN_ON_ONCE(req->wb_this_page != req);
453
454 /* extra debug: make sure no sync bits are still set */
455 WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags));
Weston Andros Adamson67d03382014-05-15 11:56:46 -0400456 WARN_ON_ONCE(test_bit(PG_UNLOCKPAGE, &req->wb_flags));
457 WARN_ON_ONCE(test_bit(PG_UPTODATE, &req->wb_flags));
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400458 WARN_ON_ONCE(test_bit(PG_WB_END, &req->wb_flags));
459 WARN_ON_ONCE(test_bit(PG_REMOVE, &req->wb_flags));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Trond Myklebustbb6fbc42010-03-11 09:19:35 -0500461 /* Release struct file and open context */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 nfs_clear_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 nfs_page_free(req);
464}
465
Trond Myklebustc03b4022007-06-17 13:26:38 -0400466void nfs_release_request(struct nfs_page *req)
467{
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400468 kref_put(&req->wb_kref, nfs_page_group_destroy);
Trond Myklebust9f557cd2010-02-03 08:27:22 -0500469}
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471/**
472 * nfs_wait_on_request - Wait for a request to complete.
473 * @req: request to wait upon.
474 *
Matthew Wilcox150030b2007-12-06 16:24:39 -0500475 * Interruptible by fatal signals only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 * The user is responsible for holding a count on the request.
477 */
478int
479nfs_wait_on_request(struct nfs_page *req)
480{
NeilBrown74316202014-07-07 15:16:04 +1000481 return wait_on_bit_io(&req->wb_flags, PG_BUSY,
482 TASK_UNINTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
484
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400485/*
486 * nfs_generic_pg_test - determine if requests can be coalesced
487 * @desc: pointer to descriptor
488 * @prev: previous request in desc, or NULL
489 * @req: this request
490 *
491 * Returns zero if @req can be coalesced into @desc, otherwise it returns
492 * the size of the request.
493 */
494size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
495 struct nfs_page *prev, struct nfs_page *req)
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300496{
Peng Tao48d635f2014-11-10 08:35:35 +0800497 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400498
499
500 if (mirror->pg_count > mirror->pg_bsize) {
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400501 /* should never happen */
502 WARN_ON_ONCE(1);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300503 return 0;
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400504 }
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300505
Christoph Hellwig2e11f822014-08-21 11:09:17 -0500506 /*
507 * Limit the request size so that we can still allocate a page array
508 * for it without upsetting the slab allocator.
509 */
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400510 if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) *
Christoph Hellwig2e11f822014-08-21 11:09:17 -0500511 sizeof(struct page) > PAGE_SIZE)
512 return 0;
513
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400514 return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300515}
Benny Halevy19345cb2011-06-19 18:33:46 -0400516EXPORT_SYMBOL_GPL(nfs_generic_pg_test);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300517
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400518struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops)
Anna Schumaker00bfa302014-05-06 09:12:29 -0400519{
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400520 struct nfs_pgio_header *hdr = ops->rw_alloc_header();
Anna Schumaker00bfa302014-05-06 09:12:29 -0400521
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400522 if (hdr) {
Anna Schumaker4a0de552014-05-06 09:12:30 -0400523 INIT_LIST_HEAD(&hdr->pages);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400524 spin_lock_init(&hdr->lock);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400525 hdr->rw_ops = ops;
526 }
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400527 return hdr;
Anna Schumaker4a0de552014-05-06 09:12:30 -0400528}
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400529EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400530
531/*
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400532 * nfs_pgio_header_free - Free a read or write header
Anna Schumaker4a0de552014-05-06 09:12:30 -0400533 * @hdr: The header to free
534 */
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400535void nfs_pgio_header_free(struct nfs_pgio_header *hdr)
Anna Schumaker4a0de552014-05-06 09:12:30 -0400536{
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400537 hdr->rw_ops->rw_free_header(hdr);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400538}
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400539EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
Anna Schumaker4a0de552014-05-06 09:12:30 -0400540
541/**
Weston Andros Adamson4714fb52014-06-09 11:48:37 -0400542 * nfs_pgio_data_destroy - make @hdr suitable for reuse
543 *
544 * Frees memory and releases refs from nfs_generic_pgio, so that it may
545 * be called again.
546 *
547 * @hdr: A header that has had nfs_generic_pgio called
Anna Schumaker00bfa302014-05-06 09:12:29 -0400548 */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400549void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr)
Anna Schumaker00bfa302014-05-06 09:12:29 -0400550{
Trond Myklebust3caa0c62014-10-13 10:26:43 -0400551 if (hdr->args.context)
552 put_nfs_open_context(hdr->args.context);
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400553 if (hdr->page_array.pagevec != hdr->page_array.page_array)
554 kfree(hdr->page_array.pagevec);
Anna Schumaker00bfa302014-05-06 09:12:29 -0400555}
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400556EXPORT_SYMBOL_GPL(nfs_pgio_data_destroy);
Anna Schumaker00bfa302014-05-06 09:12:29 -0400557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558/**
Anna Schumakerce595152014-05-06 09:12:34 -0400559 * nfs_pgio_rpcsetup - Set up arguments for a pageio call
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400560 * @hdr: The pageio hdr
Anna Schumakerce595152014-05-06 09:12:34 -0400561 * @count: Number of bytes to read
562 * @offset: Initial offset
563 * @how: How to commit data (writes only)
564 * @cinfo: Commit information for the call (writes only)
565 */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400566static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr,
Anna Schumakerce595152014-05-06 09:12:34 -0400567 unsigned int count, unsigned int offset,
568 int how, struct nfs_commit_info *cinfo)
569{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400570 struct nfs_page *req = hdr->req;
Anna Schumakerce595152014-05-06 09:12:34 -0400571
572 /* Set up the RPC argument and reply structs
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400573 * NB: take care not to mess about with hdr->commit et al. */
Anna Schumakerce595152014-05-06 09:12:34 -0400574
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400575 hdr->args.fh = NFS_FH(hdr->inode);
576 hdr->args.offset = req_offset(req) + offset;
Anna Schumakerce595152014-05-06 09:12:34 -0400577 /* pnfs_set_layoutcommit needs this */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400578 hdr->mds_offset = hdr->args.offset;
579 hdr->args.pgbase = req->wb_pgbase + offset;
580 hdr->args.pages = hdr->page_array.pagevec;
581 hdr->args.count = count;
582 hdr->args.context = get_nfs_open_context(req->wb_context);
583 hdr->args.lock_context = req->wb_lock_context;
584 hdr->args.stable = NFS_UNSTABLE;
Anna Schumakerce595152014-05-06 09:12:34 -0400585 switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
586 case 0:
587 break;
588 case FLUSH_COND_STABLE:
589 if (nfs_reqs_to_commit(cinfo))
590 break;
591 default:
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400592 hdr->args.stable = NFS_FILE_SYNC;
Anna Schumakerce595152014-05-06 09:12:34 -0400593 }
594
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400595 hdr->res.fattr = &hdr->fattr;
596 hdr->res.count = count;
597 hdr->res.eof = 0;
Weston Andros Adamsonc65e6252014-06-09 11:48:36 -0400598 hdr->res.verf = &hdr->verf;
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400599 nfs_fattr_init(&hdr->fattr);
Anna Schumakerce595152014-05-06 09:12:34 -0400600}
601
602/**
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400603 * nfs_pgio_prepare - Prepare pageio hdr to go over the wire
Anna Schumakera4cdda52014-05-06 09:12:31 -0400604 * @task: The current task
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400605 * @calldata: pageio header to prepare
Anna Schumakera4cdda52014-05-06 09:12:31 -0400606 */
Anna Schumaker6f92fa42014-05-06 09:12:33 -0400607static void nfs_pgio_prepare(struct rpc_task *task, void *calldata)
Anna Schumakera4cdda52014-05-06 09:12:31 -0400608{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400609 struct nfs_pgio_header *hdr = calldata;
Anna Schumakera4cdda52014-05-06 09:12:31 -0400610 int err;
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400611 err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr);
Anna Schumakera4cdda52014-05-06 09:12:31 -0400612 if (err)
613 rpc_exit(task, err);
614}
615
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400616int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
Peng Tao46a5ab42014-06-13 23:02:25 +0800617 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400618 const struct rpc_call_ops *call_ops, int how, int flags)
619{
620 struct rpc_task *task;
621 struct rpc_message msg = {
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400622 .rpc_argp = &hdr->args,
623 .rpc_resp = &hdr->res,
Peng Tao46a5ab42014-06-13 23:02:25 +0800624 .rpc_cred = cred,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400625 };
626 struct rpc_task_setup task_setup_data = {
627 .rpc_client = clnt,
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400628 .task = &hdr->task,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400629 .rpc_message = &msg,
630 .callback_ops = call_ops,
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400631 .callback_data = hdr,
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400632 .workqueue = nfsiod_workqueue,
633 .flags = RPC_TASK_ASYNC | flags,
634 };
635 int ret = 0;
636
Tom Haynesabde71f2014-06-09 13:12:20 -0700637 hdr->rw_ops->rw_initiate(hdr, &msg, rpc_ops, &task_setup_data, how);
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400638
639 dprintk("NFS: %5u initiated pgio call "
640 "(req %s/%llu, %u bytes @ offset %llu)\n",
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400641 hdr->task.tk_pid,
Anna Schumaker343ae532014-06-20 13:30:26 -0400642 hdr->inode->i_sb->s_id,
643 (unsigned long long)NFS_FILEID(hdr->inode),
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400644 hdr->args.count,
645 (unsigned long long)hdr->args.offset);
Anna Schumaker1ed26f32014-05-06 09:12:37 -0400646
647 task = rpc_run_task(&task_setup_data);
648 if (IS_ERR(task)) {
649 ret = PTR_ERR(task);
650 goto out;
651 }
652 if (how & FLUSH_SYNC) {
653 ret = rpc_wait_for_completion_task(task);
654 if (ret == 0)
655 ret = task->tk_status;
656 }
657 rpc_put_task(task);
658out:
659 return ret;
660}
661EXPORT_SYMBOL_GPL(nfs_initiate_pgio);
662
Anna Schumakera4cdda52014-05-06 09:12:31 -0400663/**
Anna Schumaker844c9e62014-05-06 09:12:35 -0400664 * nfs_pgio_error - Clean up from a pageio error
665 * @desc: IO descriptor
666 * @hdr: pageio header
667 */
Anna Schumakeref2c4882014-05-06 09:12:36 -0400668static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
Anna Schumaker844c9e62014-05-06 09:12:35 -0400669 struct nfs_pgio_header *hdr)
670{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400671 struct nfs_pgio_mirror *mirror;
672 u32 midx;
673
Anna Schumaker844c9e62014-05-06 09:12:35 -0400674 set_bit(NFS_IOHDR_REDO, &hdr->flags);
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400675 nfs_pgio_data_destroy(hdr);
Weston Andros Adamson4714fb52014-06-09 11:48:37 -0400676 hdr->completion_ops->completion(hdr);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400677 /* TODO: Make sure it's right to clean up all mirrors here
678 * and not just hdr->pgio_mirror_idx */
679 for (midx = 0; midx < desc->pg_mirror_count; midx++) {
680 mirror = &desc->pg_mirrors[midx];
681 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
682 }
Anna Schumaker844c9e62014-05-06 09:12:35 -0400683 return -ENOMEM;
684}
685
686/**
Anna Schumakera4cdda52014-05-06 09:12:31 -0400687 * nfs_pgio_release - Release pageio data
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400688 * @calldata: The pageio header to release
Anna Schumakera4cdda52014-05-06 09:12:31 -0400689 */
Anna Schumaker6f92fa42014-05-06 09:12:33 -0400690static void nfs_pgio_release(void *calldata)
Anna Schumakera4cdda52014-05-06 09:12:31 -0400691{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400692 struct nfs_pgio_header *hdr = calldata;
693 if (hdr->rw_ops->rw_release)
694 hdr->rw_ops->rw_release(hdr);
695 nfs_pgio_data_destroy(hdr);
Weston Andros Adamson4714fb52014-06-09 11:48:37 -0400696 hdr->completion_ops->completion(hdr);
Anna Schumakera4cdda52014-05-06 09:12:31 -0400697}
698
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400699static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror,
700 unsigned int bsize)
701{
702 INIT_LIST_HEAD(&mirror->pg_list);
703 mirror->pg_bytes_written = 0;
704 mirror->pg_count = 0;
705 mirror->pg_bsize = bsize;
706 mirror->pg_base = 0;
707 mirror->pg_recoalesce = 0;
708}
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710/**
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400711 * nfs_pageio_init - initialise a page io descriptor
712 * @desc: pointer to descriptor
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400713 * @inode: pointer to inode
714 * @doio: pointer to io function
715 * @bsize: io block size
716 * @io_flags: extra parameters for the io function
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400717 */
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400718void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
719 struct inode *inode,
Trond Myklebust1751c362011-06-10 13:30:23 -0400720 const struct nfs_pageio_ops *pg_ops,
Fred Isaman061ae2e2012-04-20 14:47:48 -0400721 const struct nfs_pgio_completion_ops *compl_ops,
Anna Schumaker4a0de552014-05-06 09:12:30 -0400722 const struct nfs_rw_ops *rw_ops,
Trond Myklebust84dde762007-05-04 14:44:06 -0400723 size_t bsize,
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400724 int io_flags)
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400725{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400726 struct nfs_pgio_mirror *new;
727 int i;
728
Trond Myklebustb31268a2011-03-21 17:02:00 -0400729 desc->pg_moreio = 0;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400730 desc->pg_inode = inode;
Trond Myklebust1751c362011-06-10 13:30:23 -0400731 desc->pg_ops = pg_ops;
Fred Isaman061ae2e2012-04-20 14:47:48 -0400732 desc->pg_completion_ops = compl_ops;
Anna Schumaker4a0de552014-05-06 09:12:30 -0400733 desc->pg_rw_ops = rw_ops;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400734 desc->pg_ioflags = io_flags;
735 desc->pg_error = 0;
Fred Isaman94ad1c82011-03-01 01:34:14 +0000736 desc->pg_lseg = NULL;
Fred Isaman584aa812012-04-20 14:47:51 -0400737 desc->pg_dreq = NULL;
Peng Taof6166382012-08-02 15:36:09 +0300738 desc->pg_layout_private = NULL;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400739 desc->pg_bsize = bsize;
740
741 desc->pg_mirror_count = 1;
742 desc->pg_mirror_idx = 0;
743
744 if (pg_ops->pg_get_mirror_count) {
745 /* until we have a request, we don't have an lseg and no
746 * idea how many mirrors there will be */
747 new = kcalloc(NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX,
748 sizeof(struct nfs_pgio_mirror), GFP_KERNEL);
749 desc->pg_mirrors_dynamic = new;
750 desc->pg_mirrors = new;
751
752 for (i = 0; i < NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX; i++)
753 nfs_pageio_mirror_init(&desc->pg_mirrors[i], bsize);
754 } else {
755 desc->pg_mirrors_dynamic = NULL;
756 desc->pg_mirrors = desc->pg_mirrors_static;
757 nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize);
758 }
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400759}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400760EXPORT_SYMBOL_GPL(nfs_pageio_init);
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400761
Anna Schumaker0eecb212014-05-06 09:12:32 -0400762/**
763 * nfs_pgio_result - Basic pageio error handling
764 * @task: The task that ran
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400765 * @calldata: Pageio header to check
Anna Schumaker0eecb212014-05-06 09:12:32 -0400766 */
Anna Schumaker6f92fa42014-05-06 09:12:33 -0400767static void nfs_pgio_result(struct rpc_task *task, void *calldata)
Anna Schumaker0eecb212014-05-06 09:12:32 -0400768{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400769 struct nfs_pgio_header *hdr = calldata;
770 struct inode *inode = hdr->inode;
Anna Schumaker0eecb212014-05-06 09:12:32 -0400771
772 dprintk("NFS: %s: %5u, (status %d)\n", __func__,
773 task->tk_pid, task->tk_status);
774
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400775 if (hdr->rw_ops->rw_done(task, hdr, inode) != 0)
Anna Schumaker0eecb212014-05-06 09:12:32 -0400776 return;
777 if (task->tk_status < 0)
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400778 nfs_set_pgio_error(hdr, task->tk_status, hdr->args.offset);
Anna Schumaker0eecb212014-05-06 09:12:32 -0400779 else
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400780 hdr->rw_ops->rw_result(task, hdr);
Anna Schumaker0eecb212014-05-06 09:12:32 -0400781}
782
Anna Schumakeref2c4882014-05-06 09:12:36 -0400783/*
Anna Schumakeref2c4882014-05-06 09:12:36 -0400784 * Create an RPC task for the given read or write request and kick it.
785 * The page must have been locked by the caller.
786 *
787 * It may happen that the page we're passed is not marked dirty.
788 * This is the case if nfs_updatepage detects a conflicting request
789 * that has been written but not committed.
790 */
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400791int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
792 struct nfs_pgio_header *hdr)
Anna Schumakeref2c4882014-05-06 09:12:36 -0400793{
Peng Tao48d635f2014-11-10 08:35:35 +0800794 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400795
Anna Schumakeref2c4882014-05-06 09:12:36 -0400796 struct nfs_page *req;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400797 struct page **pages,
798 *last_page;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400799 struct list_head *head = &mirror->pg_list;
Anna Schumakeref2c4882014-05-06 09:12:36 -0400800 struct nfs_commit_info cinfo;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400801 unsigned int pagecount, pageused;
Anna Schumakeref2c4882014-05-06 09:12:36 -0400802
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400803 pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count);
Weston Andros Adamson4714fb52014-06-09 11:48:37 -0400804 if (!nfs_pgarray_set(&hdr->page_array, pagecount))
Anna Schumakeref2c4882014-05-06 09:12:36 -0400805 return nfs_pgio_error(desc, hdr);
806
807 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400808 pages = hdr->page_array.pagevec;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400809 last_page = NULL;
810 pageused = 0;
Anna Schumakeref2c4882014-05-06 09:12:36 -0400811 while (!list_empty(head)) {
812 req = nfs_list_entry(head->next);
813 nfs_list_remove_request(req);
814 nfs_list_add_request(req, &hdr->pages);
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400815
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400816 if (!last_page || last_page != req->wb_page) {
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400817 pageused++;
Trond Myklebustb8fb9c302014-10-13 10:56:12 -0400818 if (pageused > pagecount)
819 break;
820 *pages++ = last_page = req->wb_page;
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400821 }
Anna Schumakeref2c4882014-05-06 09:12:36 -0400822 }
Weston Andros Adamsonbba5c182014-08-14 17:39:32 -0400823 if (WARN_ON_ONCE(pageused != pagecount))
824 return nfs_pgio_error(desc, hdr);
Anna Schumakeref2c4882014-05-06 09:12:36 -0400825
826 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
827 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
828 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
829
830 /* Set up the argument struct */
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400831 nfs_pgio_rpcsetup(hdr, mirror->pg_count, 0, desc->pg_ioflags, &cinfo);
Anna Schumakeref2c4882014-05-06 09:12:36 -0400832 desc->pg_rpc_callops = &nfs_pgio_common_ops;
833 return 0;
834}
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400835EXPORT_SYMBOL_GPL(nfs_generic_pgio);
Anna Schumakeref2c4882014-05-06 09:12:36 -0400836
Anna Schumaker41d8d5b2014-05-06 09:12:40 -0400837static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
Anna Schumakercf485fc2014-05-06 09:12:39 -0400838{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400839 struct nfs_pgio_mirror *mirror;
Anna Schumakercf485fc2014-05-06 09:12:39 -0400840 struct nfs_pgio_header *hdr;
841 int ret;
842
Peng Tao48d635f2014-11-10 08:35:35 +0800843 mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400844
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400845 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
846 if (!hdr) {
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400847 /* TODO: make sure this is right with mirroring - or
848 * should it back out all mirrors? */
849 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
Anna Schumakercf485fc2014-05-06 09:12:39 -0400850 return -ENOMEM;
851 }
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -0400852 nfs_pgheader_init(desc, hdr, nfs_pgio_header_free);
Anna Schumakercf485fc2014-05-06 09:12:39 -0400853 ret = nfs_generic_pgio(desc, hdr);
854 if (ret == 0)
Weston Andros Adamson7f714722014-05-15 11:56:53 -0400855 ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode),
Peng Tao46a5ab42014-06-13 23:02:25 +0800856 hdr,
857 hdr->cred,
858 NFS_PROTO(hdr->inode),
Tom Haynesabde71f2014-06-09 13:12:20 -0700859 desc->pg_rpc_callops,
Weston Andros Adamson7f714722014-05-15 11:56:53 -0400860 desc->pg_ioflags, 0);
Anna Schumakercf485fc2014-05-06 09:12:39 -0400861 return ret;
862}
863
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400864/*
865 * nfs_pageio_setup_mirroring - determine if mirroring is to be used
866 * by calling the pg_get_mirror_count op
867 */
868static int nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio,
869 struct nfs_page *req)
870{
871 int mirror_count = 1;
872
873 if (!pgio->pg_ops->pg_get_mirror_count)
874 return 0;
875
876 mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req);
877
878 if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX)
879 return -EINVAL;
880
881 if (WARN_ON_ONCE(!pgio->pg_mirrors_dynamic))
882 return -EINVAL;
883
884 pgio->pg_mirror_count = mirror_count;
885
886 return 0;
887}
888
889/*
890 * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1)
891 */
892void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio)
893{
894 pgio->pg_mirror_count = 1;
895 pgio->pg_mirror_idx = 0;
896}
897
898static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio)
899{
900 pgio->pg_mirror_count = 1;
901 pgio->pg_mirror_idx = 0;
902 pgio->pg_mirrors = pgio->pg_mirrors_static;
903 kfree(pgio->pg_mirrors_dynamic);
904 pgio->pg_mirrors_dynamic = NULL;
905}
906
Trond Myklebust4109bb72013-09-06 11:09:38 -0400907static bool nfs_match_open_context(const struct nfs_open_context *ctx1,
908 const struct nfs_open_context *ctx2)
909{
910 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
911}
912
913static bool nfs_match_lock_context(const struct nfs_lock_context *l1,
914 const struct nfs_lock_context *l2)
915{
916 return l1->lockowner.l_owner == l2->lockowner.l_owner
917 && l1->lockowner.l_pid == l2->lockowner.l_pid;
918}
919
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400920/**
921 * nfs_can_coalesce_requests - test two requests for compatibility
922 * @prev: pointer to nfs_page
923 * @req: pointer to nfs_page
924 *
925 * The nfs_page structures 'prev' and 'req' are compared to ensure that the
926 * page data area they describe is contiguous, and that their RPC
927 * credentials, NFSv4 open state, and lockowners are the same.
928 *
929 * Return 'true' if this is the case, else return 'false'.
930 */
Benny Halevy18ad0a92011-05-25 21:03:56 +0300931static bool nfs_can_coalesce_requests(struct nfs_page *prev,
932 struct nfs_page *req,
933 struct nfs_pageio_descriptor *pgio)
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400934{
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400935 size_t size;
Jeff Layton5263e312015-01-16 15:05:55 -0500936 struct file_lock_context *flctx;
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400937
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400938 if (prev) {
939 if (!nfs_match_open_context(req->wb_context, prev->wb_context))
940 return false;
David Howells2b0143b2015-03-17 22:25:59 +0000941 flctx = d_inode(req->wb_context->dentry)->i_flctx;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500942 if (flctx != NULL &&
943 !(list_empty_careful(&flctx->flc_posix) &&
944 list_empty_careful(&flctx->flc_flock)) &&
Jeff Layton5263e312015-01-16 15:05:55 -0500945 !nfs_match_lock_context(req->wb_lock_context,
946 prev->wb_lock_context))
947 return false;
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400948 if (req_offset(req) != req_offset(prev) + prev->wb_bytes)
949 return false;
Weston Andros Adamson78270e82014-08-14 17:39:33 -0400950 if (req->wb_page == prev->wb_page) {
951 if (req->wb_pgbase != prev->wb_pgbase + prev->wb_bytes)
952 return false;
953 } else {
954 if (req->wb_pgbase != 0 ||
955 prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE)
956 return false;
957 }
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400958 }
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400959 size = pgio->pg_ops->pg_test(pgio, prev, req);
Weston Andros Adamsonf0cb9ab2014-05-15 11:56:52 -0400960 WARN_ON_ONCE(size > req->wb_bytes);
961 if (size && size < req->wb_bytes)
962 req->wb_bytes = size;
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400963 return size > 0;
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400964}
965
966/**
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400967 * nfs_pageio_do_add_request - Attempt to coalesce a request into a page list.
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400968 * @desc: destination io descriptor
969 * @req: request
970 *
971 * Returns true if the request 'req' was successfully coalesced into the
972 * existing list of pages 'desc'.
973 */
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400974static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
975 struct nfs_page *req)
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400976{
Peng Tao48d635f2014-11-10 08:35:35 +0800977 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400978
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400979 struct nfs_page *prev = NULL;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400980
981 if (mirror->pg_count != 0) {
982 prev = nfs_list_entry(mirror->pg_list.prev);
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300983 } else {
Trond Myklebustd8007d42011-06-10 13:30:23 -0400984 if (desc->pg_ops->pg_init)
985 desc->pg_ops->pg_init(desc, req);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400986 mirror->pg_base = req->wb_pgbase;
Boaz Harrosh5b36c7d2011-05-29 11:45:39 +0300987 }
Weston Andros Adamsonab75e412014-05-15 11:56:44 -0400988 if (!nfs_can_coalesce_requests(prev, req, desc))
989 return 0;
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400990 nfs_list_remove_request(req);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -0400991 nfs_list_add_request(req, &mirror->pg_list);
992 mirror->pg_count += req->wb_bytes;
Trond Myklebustd8a5ad72007-04-02 18:48:28 -0400993 return 1;
994}
995
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400996/*
997 * Helper for nfs_pageio_add_request and nfs_pageio_complete
998 */
999static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
1000{
Peng Tao48d635f2014-11-10 08:35:35 +08001001 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001002
1003
1004 if (!list_empty(&mirror->pg_list)) {
Trond Myklebust1751c362011-06-10 13:30:23 -04001005 int error = desc->pg_ops->pg_doio(desc);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001006 if (error < 0)
1007 desc->pg_error = error;
1008 else
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001009 mirror->pg_bytes_written += mirror->pg_count;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001010 }
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001011 if (list_empty(&mirror->pg_list)) {
1012 mirror->pg_count = 0;
1013 mirror->pg_base = 0;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001014 }
1015}
1016
1017/**
1018 * nfs_pageio_add_request - Attempt to coalesce a request into a page list.
1019 * @desc: destination io descriptor
1020 * @req: request
1021 *
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001022 * This may split a request into subrequests which are all part of the
1023 * same page group.
1024 *
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001025 * Returns true if the request 'req' was successfully coalesced into the
1026 * existing list of pages 'desc'.
1027 */
Trond Myklebustd9156f92011-07-12 13:42:02 -04001028static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
Trond Myklebust8b09bee2007-04-02 18:48:28 -04001029 struct nfs_page *req)
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001030{
Peng Tao48d635f2014-11-10 08:35:35 +08001031 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001032
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001033 struct nfs_page *subreq;
1034 unsigned int bytes_left = 0;
1035 unsigned int offset, pgbase;
1036
Weston Andros Adamsonbfd484a2014-08-08 11:00:55 -04001037 nfs_page_group_lock(req, false);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001038
1039 subreq = req;
1040 bytes_left = subreq->wb_bytes;
1041 offset = subreq->wb_offset;
1042 pgbase = subreq->wb_pgbase;
1043
1044 do {
1045 if (!nfs_pageio_do_add_request(desc, subreq)) {
1046 /* make sure pg_test call(s) did nothing */
1047 WARN_ON_ONCE(subreq->wb_bytes != bytes_left);
1048 WARN_ON_ONCE(subreq->wb_offset != offset);
1049 WARN_ON_ONCE(subreq->wb_pgbase != pgbase);
1050
1051 nfs_page_group_unlock(req);
1052 desc->pg_moreio = 1;
1053 nfs_pageio_doio(desc);
1054 if (desc->pg_error < 0)
1055 return 0;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001056 if (mirror->pg_recoalesce)
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001057 return 0;
1058 /* retry add_request for this subreq */
Weston Andros Adamsonbfd484a2014-08-08 11:00:55 -04001059 nfs_page_group_lock(req, false);
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001060 continue;
1061 }
1062
1063 /* check for buggy pg_test call(s) */
1064 WARN_ON_ONCE(subreq->wb_bytes + subreq->wb_pgbase > PAGE_SIZE);
1065 WARN_ON_ONCE(subreq->wb_bytes > bytes_left);
1066 WARN_ON_ONCE(subreq->wb_bytes == 0);
1067
1068 bytes_left -= subreq->wb_bytes;
1069 offset += subreq->wb_bytes;
1070 pgbase += subreq->wb_bytes;
1071
1072 if (bytes_left) {
1073 subreq = nfs_create_request(req->wb_context,
1074 req->wb_page,
1075 subreq, pgbase, bytes_left);
Trond Myklebustc1109552014-05-29 11:38:15 -04001076 if (IS_ERR(subreq))
1077 goto err_ptr;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001078 nfs_lock_request(subreq);
1079 subreq->wb_offset = offset;
1080 subreq->wb_index = req->wb_index;
1081 }
1082 } while (bytes_left > 0);
1083
1084 nfs_page_group_unlock(req);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001085 return 1;
Trond Myklebustc1109552014-05-29 11:38:15 -04001086err_ptr:
1087 desc->pg_error = PTR_ERR(subreq);
1088 nfs_page_group_unlock(req);
1089 return 0;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001090}
1091
Trond Myklebustd9156f92011-07-12 13:42:02 -04001092static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
1093{
Peng Tao48d635f2014-11-10 08:35:35 +08001094 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
Trond Myklebustd9156f92011-07-12 13:42:02 -04001095 LIST_HEAD(head);
1096
1097 do {
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001098 list_splice_init(&mirror->pg_list, &head);
1099 mirror->pg_bytes_written -= mirror->pg_count;
1100 mirror->pg_count = 0;
1101 mirror->pg_base = 0;
1102 mirror->pg_recoalesce = 0;
1103
Trond Myklebustf563b892014-07-13 15:13:19 -04001104 desc->pg_moreio = 0;
Trond Myklebustd9156f92011-07-12 13:42:02 -04001105
1106 while (!list_empty(&head)) {
1107 struct nfs_page *req;
1108
1109 req = list_first_entry(&head, struct nfs_page, wb_list);
1110 nfs_list_remove_request(req);
1111 if (__nfs_pageio_add_request(desc, req))
1112 continue;
1113 if (desc->pg_error < 0)
1114 return 0;
1115 break;
1116 }
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001117 } while (mirror->pg_recoalesce);
Trond Myklebustd9156f92011-07-12 13:42:02 -04001118 return 1;
1119}
1120
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001121static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc,
Trond Myklebustd9156f92011-07-12 13:42:02 -04001122 struct nfs_page *req)
1123{
1124 int ret;
1125
1126 do {
1127 ret = __nfs_pageio_add_request(desc, req);
1128 if (ret)
1129 break;
1130 if (desc->pg_error < 0)
1131 break;
1132 ret = nfs_do_recoalesce(desc);
1133 } while (ret);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001134
Trond Myklebustd9156f92011-07-12 13:42:02 -04001135 return ret;
1136}
1137
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001138int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
1139 struct nfs_page *req)
1140{
1141 u32 midx;
1142 unsigned int pgbase, offset, bytes;
1143 struct nfs_page *dupreq, *lastreq;
1144
1145 pgbase = req->wb_pgbase;
1146 offset = req->wb_offset;
1147 bytes = req->wb_bytes;
1148
1149 nfs_pageio_setup_mirroring(desc, req);
1150
1151 for (midx = 0; midx < desc->pg_mirror_count; midx++) {
1152 if (midx) {
1153 nfs_page_group_lock(req, false);
1154
1155 /* find the last request */
1156 for (lastreq = req->wb_head;
1157 lastreq->wb_this_page != req->wb_head;
1158 lastreq = lastreq->wb_this_page)
1159 ;
1160
1161 dupreq = nfs_create_request(req->wb_context,
1162 req->wb_page, lastreq, pgbase, bytes);
1163
1164 if (IS_ERR(dupreq)) {
1165 nfs_page_group_unlock(req);
1166 return 0;
1167 }
1168
1169 nfs_lock_request(dupreq);
1170 nfs_page_group_unlock(req);
1171 dupreq->wb_offset = offset;
1172 dupreq->wb_index = req->wb_index;
1173 } else
1174 dupreq = req;
1175
Peng Tao47af81f2014-11-10 08:35:34 +08001176 if (nfs_pgio_has_mirroring(desc))
1177 desc->pg_mirror_idx = midx;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001178 if (!nfs_pageio_add_request_mirror(desc, dupreq))
1179 return 0;
1180 }
1181
1182 return 1;
1183}
1184
1185/*
1186 * nfs_pageio_complete_mirror - Complete I/O on the current mirror of an
1187 * nfs_pageio_descriptor
1188 * @desc: pointer to io descriptor
1189 */
1190static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
1191 u32 mirror_idx)
1192{
1193 struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx];
1194 u32 restore_idx = desc->pg_mirror_idx;
1195
Peng Tao47af81f2014-11-10 08:35:34 +08001196 if (nfs_pgio_has_mirroring(desc))
1197 desc->pg_mirror_idx = mirror_idx;
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001198 for (;;) {
1199 nfs_pageio_doio(desc);
1200 if (!mirror->pg_recoalesce)
1201 break;
1202 if (!nfs_do_recoalesce(desc))
1203 break;
1204 }
1205 desc->pg_mirror_idx = restore_idx;
1206}
1207
Weston Andros Adamson53113ad2014-06-09 11:48:38 -04001208/*
1209 * nfs_pageio_resend - Transfer requests to new descriptor and resend
1210 * @hdr - the pgio header to move request from
1211 * @desc - the pageio descriptor to add requests to
1212 *
1213 * Try to move each request (nfs_page) from @hdr to @desc then attempt
1214 * to send them.
1215 *
1216 * Returns 0 on success and < 0 on error.
1217 */
1218int nfs_pageio_resend(struct nfs_pageio_descriptor *desc,
1219 struct nfs_pgio_header *hdr)
1220{
1221 LIST_HEAD(failed);
1222
1223 desc->pg_dreq = hdr->dreq;
1224 while (!list_empty(&hdr->pages)) {
1225 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
1226
1227 nfs_list_remove_request(req);
1228 if (!nfs_pageio_add_request(desc, req))
1229 nfs_list_add_request(req, &failed);
1230 }
1231 nfs_pageio_complete(desc);
1232 if (!list_empty(&failed)) {
1233 list_move(&failed, &hdr->pages);
1234 return -EIO;
1235 }
1236 return 0;
1237}
1238EXPORT_SYMBOL_GPL(nfs_pageio_resend);
Trond Myklebustd8a5ad72007-04-02 18:48:28 -04001239
1240/**
Weston Andros Adamson2176bf42014-09-10 15:44:18 -04001241 * nfs_pageio_complete - Complete I/O then cleanup an nfs_pageio_descriptor
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001242 * @desc: pointer to io descriptor
1243 */
1244void nfs_pageio_complete(struct nfs_pageio_descriptor *desc)
1245{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001246 u32 midx;
1247
1248 for (midx = 0; midx < desc->pg_mirror_count; midx++)
1249 nfs_pageio_complete_mirror(desc, midx);
Weston Andros Adamson2176bf42014-09-10 15:44:18 -04001250
1251 if (desc->pg_ops->pg_cleanup)
1252 desc->pg_ops->pg_cleanup(desc);
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001253 nfs_pageio_cleanup_mirroring(desc);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001254}
1255
Trond Myklebust7fe7f842007-05-20 10:18:27 -04001256/**
1257 * nfs_pageio_cond_complete - Conditional I/O completion
1258 * @desc: pointer to io descriptor
1259 * @index: page index
1260 *
1261 * It is important to ensure that processes don't try to take locks
1262 * on non-contiguous ranges of pages as that might deadlock. This
1263 * function should be called before attempting to wait on a locked
1264 * nfs_page. It will complete the I/O if the page index 'index'
1265 * is not contiguous with the existing list of pages in 'desc'.
1266 */
1267void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
1268{
Weston Andros Adamsona7d42dd2014-09-19 10:55:07 -04001269 struct nfs_pgio_mirror *mirror;
1270 struct nfs_page *prev;
1271 u32 midx;
1272
1273 for (midx = 0; midx < desc->pg_mirror_count; midx++) {
1274 mirror = &desc->pg_mirrors[midx];
1275 if (!list_empty(&mirror->pg_list)) {
1276 prev = nfs_list_entry(mirror->pg_list.prev);
1277 if (index != prev->wb_index + 1)
1278 nfs_pageio_complete_mirror(desc, midx);
1279 }
Trond Myklebust7fe7f842007-05-20 10:18:27 -04001280 }
1281}
1282
David Howellsf7b422b2006-06-09 09:34:33 -04001283int __init nfs_init_nfspagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284{
1285 nfs_page_cachep = kmem_cache_create("nfs_page",
1286 sizeof(struct nfs_page),
1287 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001288 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 if (nfs_page_cachep == NULL)
1290 return -ENOMEM;
1291
1292 return 0;
1293}
1294
David Brownell266bee82006-06-27 12:59:15 -07001295void nfs_destroy_nfspagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001297 kmem_cache_destroy(nfs_page_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298}
1299
Anna Schumakeref2c4882014-05-06 09:12:36 -04001300static const struct rpc_call_ops nfs_pgio_common_ops = {
Anna Schumaker6f92fa42014-05-06 09:12:33 -04001301 .rpc_call_prepare = nfs_pgio_prepare,
1302 .rpc_call_done = nfs_pgio_result,
1303 .rpc_release = nfs_pgio_release,
1304};
Anna Schumaker41d8d5b2014-05-06 09:12:40 -04001305
1306const struct nfs_pageio_ops nfs_pgio_rw_ops = {
1307 .pg_test = nfs_generic_pg_test,
1308 .pg_doio = nfs_generic_pg_pgios,
1309};