blob: 38512bcd2e98b4c82e3b03e2592061c06897abe5 [file] [log] [blame]
Ricardo Labiaga85e174b2010-10-20 00:17:58 -04001/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
Trond Myklebust493292d2011-07-13 15:58:28 -040031#include <linux/nfs_page.h>
Paul Gortmaker143cb492011-07-01 14:23:34 -040032#include <linux/module.h>
Andy Adamson974cec82010-10-20 00:18:02 -040033#include "internal.h"
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040034#include "pnfs.h"
Andy Adamson64419a92011-03-01 01:34:16 +000035#include "iostat.h"
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040036
37#define NFSDBG_FACILITY NFSDBG_PNFS
38
Fred Isaman02c35fc2010-10-20 00:17:59 -040039/* Locking:
40 *
41 * pnfs_spinlock:
42 * protects pnfs_modules_tbl.
43 */
44static DEFINE_SPINLOCK(pnfs_spinlock);
45
46/*
47 * pnfs_modules_tbl holds all pnfs modules
48 */
49static LIST_HEAD(pnfs_modules_tbl);
50
51/* Return the registered pnfs layout driver module matching given id */
52static struct pnfs_layoutdriver_type *
53find_pnfs_driver_locked(u32 id)
54{
55 struct pnfs_layoutdriver_type *local;
56
57 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
58 if (local->id == id)
59 goto out;
60 local = NULL;
61out:
62 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
63 return local;
64}
65
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040066static struct pnfs_layoutdriver_type *
67find_pnfs_driver(u32 id)
68{
Fred Isaman02c35fc2010-10-20 00:17:59 -040069 struct pnfs_layoutdriver_type *local;
70
71 spin_lock(&pnfs_spinlock);
72 local = find_pnfs_driver_locked(id);
73 spin_unlock(&pnfs_spinlock);
74 return local;
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040075}
76
77void
78unset_pnfs_layoutdriver(struct nfs_server *nfss)
79{
Benny Halevy738fd0f32011-07-30 20:52:36 -040080 if (nfss->pnfs_curr_ld) {
81 if (nfss->pnfs_curr_ld->clear_layoutdriver)
82 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
Fred Isaman02c35fc2010-10-20 00:17:59 -040083 module_put(nfss->pnfs_curr_ld->owner);
Benny Halevy738fd0f32011-07-30 20:52:36 -040084 }
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040085 nfss->pnfs_curr_ld = NULL;
86}
87
88/*
89 * Try to set the server's pnfs module to the pnfs layout type specified by id.
90 * Currently only one pNFS layout driver per filesystem is supported.
91 *
92 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
93 */
94void
Benny Halevy738fd0f32011-07-30 20:52:36 -040095set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
96 u32 id)
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040097{
98 struct pnfs_layoutdriver_type *ld_type = NULL;
99
100 if (id == 0)
101 goto out_no_driver;
102 if (!(server->nfs_client->cl_exchange_flags &
103 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500104 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
105 __func__, id, server->nfs_client->cl_exchange_flags);
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400106 goto out_no_driver;
107 }
108 ld_type = find_pnfs_driver(id);
109 if (!ld_type) {
110 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
111 ld_type = find_pnfs_driver(id);
112 if (!ld_type) {
113 dprintk("%s: No pNFS module found for %u.\n",
114 __func__, id);
115 goto out_no_driver;
116 }
117 }
Fred Isaman02c35fc2010-10-20 00:17:59 -0400118 if (!try_module_get(ld_type->owner)) {
119 dprintk("%s: Could not grab reference on module\n", __func__);
120 goto out_no_driver;
121 }
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400122 server->pnfs_curr_ld = ld_type;
Benny Halevy738fd0f32011-07-30 20:52:36 -0400123 if (ld_type->set_layoutdriver
124 && ld_type->set_layoutdriver(server, mntfh)) {
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500125 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
126 "driver %u.\n", __func__, id);
Benny Halevy738fd0f32011-07-30 20:52:36 -0400127 module_put(ld_type->owner);
128 goto out_no_driver;
129 }
Christoph Hellwigea8eecd2011-03-01 01:34:21 +0000130
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400131 dprintk("%s: pNFS module for %u set\n", __func__, id);
132 return;
133
134out_no_driver:
135 dprintk("%s: Using NFSv4 I/O\n", __func__);
136 server->pnfs_curr_ld = NULL;
137}
Fred Isaman02c35fc2010-10-20 00:17:59 -0400138
139int
140pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
141{
142 int status = -EINVAL;
143 struct pnfs_layoutdriver_type *tmp;
144
145 if (ld_type->id == 0) {
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500146 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
Fred Isaman02c35fc2010-10-20 00:17:59 -0400147 return status;
148 }
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400149 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500150 printk(KERN_ERR "NFS: %s Layout driver must provide "
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400151 "alloc_lseg and free_lseg.\n", __func__);
152 return status;
153 }
Fred Isaman02c35fc2010-10-20 00:17:59 -0400154
155 spin_lock(&pnfs_spinlock);
156 tmp = find_pnfs_driver_locked(ld_type->id);
157 if (!tmp) {
158 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
159 status = 0;
160 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
161 ld_type->name);
162 } else {
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500163 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
Fred Isaman02c35fc2010-10-20 00:17:59 -0400164 __func__, ld_type->id);
165 }
166 spin_unlock(&pnfs_spinlock);
167
168 return status;
169}
170EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
171
172void
173pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
174{
175 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
176 spin_lock(&pnfs_spinlock);
177 list_del(&ld_type->pnfs_tblid);
178 spin_unlock(&pnfs_spinlock);
179}
180EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
Benny Halevye5e94012010-10-20 00:18:01 -0400181
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400182/*
183 * pNFS client layout cache
184 */
185
Fred Isamancc6e5342011-01-06 11:36:28 +0000186/* Need to hold i_lock if caller does not already hold reference */
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000187void
Fred Isamancc6e5342011-01-06 11:36:28 +0000188get_layout_hdr(struct pnfs_layout_hdr *lo)
Benny Halevye5e94012010-10-20 00:18:01 -0400189{
Fred Isamancc6e5342011-01-06 11:36:28 +0000190 atomic_inc(&lo->plh_refcount);
191}
192
Benny Halevy636fb9c2011-05-22 19:51:33 +0300193static struct pnfs_layout_hdr *
194pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
195{
196 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
197 return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) :
198 kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags);
199}
200
201static void
202pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
203{
204 struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
Peng Tao9fa40752011-07-30 20:52:32 -0400205 put_rpccred(lo->plh_lc_cred);
Benny Halevy636fb9c2011-05-22 19:51:33 +0300206 return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
207}
208
Fred Isamancc6e5342011-01-06 11:36:28 +0000209static void
210destroy_layout_hdr(struct pnfs_layout_hdr *lo)
211{
212 dprintk("%s: freeing layout cache %p\n", __func__, lo);
213 BUG_ON(!list_empty(&lo->plh_layouts));
214 NFS_I(lo->plh_inode)->layout = NULL;
Benny Halevy636fb9c2011-05-22 19:51:33 +0300215 pnfs_free_layout_hdr(lo);
Benny Halevye5e94012010-10-20 00:18:01 -0400216}
217
218static void
219put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
220{
Fred Isamancc6e5342011-01-06 11:36:28 +0000221 if (atomic_dec_and_test(&lo->plh_refcount))
222 destroy_layout_hdr(lo);
Benny Halevye5e94012010-10-20 00:18:01 -0400223}
224
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400225void
Fred Isamancc6e5342011-01-06 11:36:28 +0000226put_layout_hdr(struct pnfs_layout_hdr *lo)
Andy Adamson974cec82010-10-20 00:18:02 -0400227{
Fred Isamancc6e5342011-01-06 11:36:28 +0000228 struct inode *inode = lo->plh_inode;
229
230 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
231 destroy_layout_hdr(lo);
232 spin_unlock(&inode->i_lock);
233 }
Andy Adamson974cec82010-10-20 00:18:02 -0400234}
235
236static void
237init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
238{
Fred Isaman566052c2011-01-06 11:36:20 +0000239 INIT_LIST_HEAD(&lseg->pls_list);
Peng Taoa9bae562011-07-30 20:52:33 -0400240 INIT_LIST_HEAD(&lseg->pls_lc_list);
Fred Isaman4541d162011-01-06 11:36:23 +0000241 atomic_set(&lseg->pls_refcount, 1);
242 smp_mb();
243 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
Fred Isaman566052c2011-01-06 11:36:20 +0000244 lseg->pls_layout = lo;
Andy Adamson974cec82010-10-20 00:18:02 -0400245}
246
Fred Isaman4541d162011-01-06 11:36:23 +0000247static void free_lseg(struct pnfs_layout_segment *lseg)
Andy Adamson974cec82010-10-20 00:18:02 -0400248{
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000249 struct inode *ino = lseg->pls_layout->plh_inode;
Andy Adamson974cec82010-10-20 00:18:02 -0400250
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400251 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
Fred Isaman52fabd72011-01-06 11:36:18 +0000252 /* Matched by get_layout_hdr in pnfs_insert_layout */
Fred Isamancc6e5342011-01-06 11:36:28 +0000253 put_layout_hdr(NFS_I(ino)->layout);
Andy Adamson974cec82010-10-20 00:18:02 -0400254}
255
Fred Isamand684d2a2011-03-01 01:34:13 +0000256static void
257put_lseg_common(struct pnfs_layout_segment *lseg)
Andy Adamson974cec82010-10-20 00:18:02 -0400258{
Fred Isamand684d2a2011-03-01 01:34:13 +0000259 struct inode *inode = lseg->pls_layout->plh_inode;
260
Benny Halevyd20581a2011-05-22 19:52:03 +0300261 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
Fred Isamand684d2a2011-03-01 01:34:13 +0000262 list_del_init(&lseg->pls_list);
263 if (list_empty(&lseg->pls_layout->plh_segs)) {
264 set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags);
265 /* Matched by initial refcount set in alloc_init_layout_hdr */
266 put_layout_hdr_locked(lseg->pls_layout);
267 }
268 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
269}
270
Fred Isamanbae724e2011-03-01 01:34:15 +0000271void
Fred Isamand684d2a2011-03-01 01:34:13 +0000272put_lseg(struct pnfs_layout_segment *lseg)
273{
274 struct inode *inode;
275
276 if (!lseg)
277 return;
278
Fred Isaman4541d162011-01-06 11:36:23 +0000279 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
280 atomic_read(&lseg->pls_refcount),
281 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
Fred Isamand684d2a2011-03-01 01:34:13 +0000282 inode = lseg->pls_layout->plh_inode;
283 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
284 LIST_HEAD(free_me);
Andy Adamson974cec82010-10-20 00:18:02 -0400285
Fred Isamand684d2a2011-03-01 01:34:13 +0000286 put_lseg_common(lseg);
287 list_add(&lseg->pls_list, &free_me);
288 spin_unlock(&inode->i_lock);
289 pnfs_free_lseg_list(&free_me);
Fred Isaman4541d162011-01-06 11:36:23 +0000290 }
Andy Adamson974cec82010-10-20 00:18:02 -0400291}
Fred Isamane0c2b382011-03-23 13:27:53 +0000292EXPORT_SYMBOL_GPL(put_lseg);
Andy Adamson974cec82010-10-20 00:18:02 -0400293
Benny Halevyfb3296e2011-05-22 19:47:26 +0300294static inline u64
295end_offset(u64 start, u64 len)
Fred Isaman4541d162011-01-06 11:36:23 +0000296{
Benny Halevyfb3296e2011-05-22 19:47:26 +0300297 u64 end;
298
299 end = start + len;
300 return end >= start ? end : NFS4_MAX_UINT64;
301}
302
303/* last octet in a range */
304static inline u64
305last_byte_offset(u64 start, u64 len)
306{
307 u64 end;
308
309 BUG_ON(!len);
310 end = start + len;
311 return end > start ? end - 1 : NFS4_MAX_UINT64;
312}
313
314/*
315 * is l2 fully contained in l1?
316 * start1 end1
317 * [----------------------------------)
318 * start2 end2
319 * [----------------)
320 */
321static inline int
322lo_seg_contained(struct pnfs_layout_range *l1,
323 struct pnfs_layout_range *l2)
324{
325 u64 start1 = l1->offset;
326 u64 end1 = end_offset(start1, l1->length);
327 u64 start2 = l2->offset;
328 u64 end2 = end_offset(start2, l2->length);
329
330 return (start1 <= start2) && (end1 >= end2);
331}
332
333/*
334 * is l1 and l2 intersecting?
335 * start1 end1
336 * [----------------------------------)
337 * start2 end2
338 * [----------------)
339 */
340static inline int
341lo_seg_intersecting(struct pnfs_layout_range *l1,
342 struct pnfs_layout_range *l2)
343{
344 u64 start1 = l1->offset;
345 u64 end1 = end_offset(start1, l1->length);
346 u64 start2 = l2->offset;
347 u64 end2 = end_offset(start2, l2->length);
348
349 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
350 (end2 == NFS4_MAX_UINT64 || end2 > start1);
351}
352
Fred Isaman4541d162011-01-06 11:36:23 +0000353static bool
Benny Halevy778b5502011-05-22 19:48:02 +0300354should_free_lseg(struct pnfs_layout_range *lseg_range,
355 struct pnfs_layout_range *recall_range)
Fred Isaman4541d162011-01-06 11:36:23 +0000356{
Benny Halevy778b5502011-05-22 19:48:02 +0300357 return (recall_range->iomode == IOMODE_ANY ||
358 lseg_range->iomode == recall_range->iomode) &&
359 lo_seg_intersecting(lseg_range, recall_range);
Fred Isaman4541d162011-01-06 11:36:23 +0000360}
361
362/* Returns 1 if lseg is removed from list, 0 otherwise */
363static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
364 struct list_head *tmp_list)
365{
366 int rv = 0;
367
368 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
369 /* Remove the reference keeping the lseg in the
370 * list. It will now be removed when all
371 * outstanding io is finished.
372 */
Fred Isamand684d2a2011-03-01 01:34:13 +0000373 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
374 atomic_read(&lseg->pls_refcount));
375 if (atomic_dec_and_test(&lseg->pls_refcount)) {
376 put_lseg_common(lseg);
377 list_add(&lseg->pls_list, tmp_list);
378 rv = 1;
379 }
Fred Isaman4541d162011-01-06 11:36:23 +0000380 }
381 return rv;
382}
383
384/* Returns count of number of matching invalid lsegs remaining in list
385 * after call.
386 */
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000387int
Fred Isaman4541d162011-01-06 11:36:23 +0000388mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
389 struct list_head *tmp_list,
Benny Halevy778b5502011-05-22 19:48:02 +0300390 struct pnfs_layout_range *recall_range)
Andy Adamson974cec82010-10-20 00:18:02 -0400391{
392 struct pnfs_layout_segment *lseg, *next;
Fred Isaman4541d162011-01-06 11:36:23 +0000393 int invalid = 0, removed = 0;
Andy Adamson974cec82010-10-20 00:18:02 -0400394
395 dprintk("%s:Begin lo %p\n", __func__, lo);
396
Fred Isaman38511722011-02-03 18:28:50 +0000397 if (list_empty(&lo->plh_segs)) {
398 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags))
399 put_layout_hdr_locked(lo);
400 return 0;
401 }
Fred Isaman4541d162011-01-06 11:36:23 +0000402 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
Benny Halevy778b5502011-05-22 19:48:02 +0300403 if (!recall_range ||
404 should_free_lseg(&lseg->pls_range, recall_range)) {
Fred Isaman4541d162011-01-06 11:36:23 +0000405 dprintk("%s: freeing lseg %p iomode %d "
406 "offset %llu length %llu\n", __func__,
407 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
408 lseg->pls_range.length);
409 invalid++;
410 removed += mark_lseg_invalid(lseg, tmp_list);
411 }
412 dprintk("%s:Return %i\n", __func__, invalid - removed);
413 return invalid - removed;
Andy Adamson974cec82010-10-20 00:18:02 -0400414}
415
Fred Isamanf49f9ba2011-02-03 18:28:52 +0000416/* note free_me must contain lsegs from a single layout_hdr */
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000417void
Fred Isaman4541d162011-01-06 11:36:23 +0000418pnfs_free_lseg_list(struct list_head *free_me)
Andy Adamson974cec82010-10-20 00:18:02 -0400419{
Fred Isaman4541d162011-01-06 11:36:23 +0000420 struct pnfs_layout_segment *lseg, *tmp;
Fred Isamanf49f9ba2011-02-03 18:28:52 +0000421 struct pnfs_layout_hdr *lo;
Andy Adamson974cec82010-10-20 00:18:02 -0400422
Fred Isamanf49f9ba2011-02-03 18:28:52 +0000423 if (list_empty(free_me))
424 return;
425
426 lo = list_first_entry(free_me, struct pnfs_layout_segment,
427 pls_list)->pls_layout;
428
429 if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
430 struct nfs_client *clp;
431
432 clp = NFS_SERVER(lo->plh_inode)->nfs_client;
433 spin_lock(&clp->cl_lock);
434 list_del_init(&lo->plh_layouts);
435 spin_unlock(&clp->cl_lock);
436 }
Fred Isaman4541d162011-01-06 11:36:23 +0000437 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
Fred Isaman566052c2011-01-06 11:36:20 +0000438 list_del(&lseg->pls_list);
Fred Isaman4541d162011-01-06 11:36:23 +0000439 free_lseg(lseg);
Andy Adamson974cec82010-10-20 00:18:02 -0400440 }
441}
442
Benny Halevye5e94012010-10-20 00:18:01 -0400443void
444pnfs_destroy_layout(struct nfs_inode *nfsi)
445{
446 struct pnfs_layout_hdr *lo;
Andy Adamson974cec82010-10-20 00:18:02 -0400447 LIST_HEAD(tmp_list);
Benny Halevye5e94012010-10-20 00:18:01 -0400448
449 spin_lock(&nfsi->vfs_inode.i_lock);
450 lo = nfsi->layout;
451 if (lo) {
Fred Isaman38511722011-02-03 18:28:50 +0000452 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
Benny Halevy778b5502011-05-22 19:48:02 +0300453 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
Benny Halevye5e94012010-10-20 00:18:01 -0400454 }
455 spin_unlock(&nfsi->vfs_inode.i_lock);
Andy Adamson974cec82010-10-20 00:18:02 -0400456 pnfs_free_lseg_list(&tmp_list);
Benny Halevye5e94012010-10-20 00:18:01 -0400457}
458
Andy Adamson974cec82010-10-20 00:18:02 -0400459/*
460 * Called by the state manger to remove all layouts established under an
461 * expired lease.
462 */
463void
464pnfs_destroy_all_layouts(struct nfs_client *clp)
465{
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400466 struct nfs_server *server;
Andy Adamson974cec82010-10-20 00:18:02 -0400467 struct pnfs_layout_hdr *lo;
468 LIST_HEAD(tmp_list);
469
Andy Adamsonc47abcf2011-06-15 17:52:40 -0400470 nfs4_deviceid_mark_client_invalid(clp);
471 nfs4_deviceid_purge_client(clp);
472
Andy Adamson974cec82010-10-20 00:18:02 -0400473 spin_lock(&clp->cl_lock);
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400474 rcu_read_lock();
475 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
476 if (!list_empty(&server->layouts))
477 list_splice_init(&server->layouts, &tmp_list);
478 }
479 rcu_read_unlock();
Andy Adamson974cec82010-10-20 00:18:02 -0400480 spin_unlock(&clp->cl_lock);
481
482 while (!list_empty(&tmp_list)) {
483 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000484 plh_layouts);
Andy Adamson974cec82010-10-20 00:18:02 -0400485 dprintk("%s freeing layout for inode %lu\n", __func__,
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000486 lo->plh_inode->i_ino);
Andy Adamson2887fe42011-05-11 01:19:58 -0400487 list_del_init(&lo->plh_layouts);
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000488 pnfs_destroy_layout(NFS_I(lo->plh_inode));
Andy Adamson974cec82010-10-20 00:18:02 -0400489 }
490}
491
Fred Isamanfd6002e2011-01-06 11:36:22 +0000492/* update lo->plh_stateid with new if is more recent */
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000493void
494pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
495 bool update_barrier)
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400496{
Fred Isamanfd6002e2011-01-06 11:36:22 +0000497 u32 oldseq, newseq;
Andy Adamson974cec82010-10-20 00:18:02 -0400498
Trond Myklebust2d2f24a2012-03-04 18:13:57 -0500499 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
500 newseq = be32_to_cpu(new->seqid);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000501 if ((int)(newseq - oldseq) > 0) {
Trond Myklebustf597c532012-03-04 18:13:56 -0500502 nfs4_stateid_copy(&lo->plh_stateid, new);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000503 if (update_barrier) {
Trond Myklebust2d2f24a2012-03-04 18:13:57 -0500504 u32 new_barrier = be32_to_cpu(new->seqid);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000505
506 if ((int)(new_barrier - lo->plh_barrier))
507 lo->plh_barrier = new_barrier;
508 } else {
509 /* Because of wraparound, we want to keep the barrier
510 * "close" to the current seqids. It needs to be
511 * within 2**31 to count as "behind", so if it
512 * gets too near that limit, give us a litle leeway
513 * and bring it to within 2**30.
514 * NOTE - and yes, this is all unsigned arithmetic.
515 */
516 if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
517 lo->plh_barrier = newseq - (1 << 30);
518 }
519 }
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400520}
521
Fred Isamancf7d63f2011-01-06 11:36:25 +0000522/* lget is set to 1 if called from inside send_layoutget call chain */
523static bool
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000524pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
525 int lget)
Fred Isamancf7d63f2011-01-06 11:36:25 +0000526{
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000527 if ((stateid) &&
Trond Myklebust2d2f24a2012-03-04 18:13:57 -0500528 (int)(lo->plh_barrier - be32_to_cpu(stateid->seqid)) >= 0)
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000529 return true;
Fred Isamanf7e89172011-01-06 11:36:32 +0000530 return lo->plh_block_lgets ||
Fred Isaman38511722011-02-03 18:28:50 +0000531 test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) ||
Fred Isamanf7e89172011-01-06 11:36:32 +0000532 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000533 (list_empty(&lo->plh_segs) &&
Fred Isamancf7d63f2011-01-06 11:36:25 +0000534 (atomic_read(&lo->plh_outstanding) > lget));
535}
536
Fred Isamanfd6002e2011-01-06 11:36:22 +0000537int
538pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
539 struct nfs4_state *open_state)
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400540{
Fred Isamanfd6002e2011-01-06 11:36:22 +0000541 int status = 0;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400542
543 dprintk("--> %s\n", __func__);
Fred Isamanfd6002e2011-01-06 11:36:22 +0000544 spin_lock(&lo->plh_inode->i_lock);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000545 if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
Fred Isamancf7d63f2011-01-06 11:36:25 +0000546 status = -EAGAIN;
547 } else if (list_empty(&lo->plh_segs)) {
Fred Isamanfd6002e2011-01-06 11:36:22 +0000548 int seq;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400549
Fred Isamanfd6002e2011-01-06 11:36:22 +0000550 do {
551 seq = read_seqbegin(&open_state->seqlock);
Trond Myklebustf597c532012-03-04 18:13:56 -0500552 nfs4_stateid_copy(dst, &open_state->stateid);
Fred Isamanfd6002e2011-01-06 11:36:22 +0000553 } while (read_seqretry(&open_state->seqlock, seq));
554 } else
Trond Myklebustf597c532012-03-04 18:13:56 -0500555 nfs4_stateid_copy(dst, &lo->plh_stateid);
Fred Isamanfd6002e2011-01-06 11:36:22 +0000556 spin_unlock(&lo->plh_inode->i_lock);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400557 dprintk("<-- %s\n", __func__);
Fred Isamanfd6002e2011-01-06 11:36:22 +0000558 return status;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400559}
560
561/*
562* Get layout from server.
563* for now, assume that whole file layouts are requested.
564* arg->offset: 0
565* arg->length: all ones
566*/
Benny Halevye5e94012010-10-20 00:18:01 -0400567static struct pnfs_layout_segment *
568send_layoutget(struct pnfs_layout_hdr *lo,
569 struct nfs_open_context *ctx,
Benny Halevyfb3296e2011-05-22 19:47:26 +0300570 struct pnfs_layout_range *range,
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400571 gfp_t gfp_flags)
Benny Halevye5e94012010-10-20 00:18:01 -0400572{
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000573 struct inode *ino = lo->plh_inode;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400574 struct nfs_server *server = NFS_SERVER(ino);
575 struct nfs4_layoutget *lgp;
576 struct pnfs_layout_segment *lseg = NULL;
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400577 struct page **pages = NULL;
578 int i;
579 u32 max_resp_sz, max_pages;
Benny Halevye5e94012010-10-20 00:18:01 -0400580
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400581 dprintk("--> %s\n", __func__);
582
583 BUG_ON(ctx == NULL);
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400584 lgp = kzalloc(sizeof(*lgp), gfp_flags);
Fred Isamancf7d63f2011-01-06 11:36:25 +0000585 if (lgp == NULL)
Andy Adamson974cec82010-10-20 00:18:02 -0400586 return NULL;
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400587
588 /* allocate pages for xdr post processing */
589 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
Andy Adamsone5265a02012-04-14 03:56:35 -0400590 max_pages = nfs_page_array_len(0, max_resp_sz);
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400591
Trond Myklebust7d9dea92012-01-20 18:57:02 -0500592 pages = kcalloc(max_pages, sizeof(struct page *), gfp_flags);
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400593 if (!pages)
594 goto out_err_free;
595
596 for (i = 0; i < max_pages; i++) {
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400597 pages[i] = alloc_page(gfp_flags);
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400598 if (!pages[i])
599 goto out_err_free;
600 }
601
Benny Halevyfb3296e2011-05-22 19:47:26 +0300602 lgp->args.minlength = PAGE_CACHE_SIZE;
603 if (lgp->args.minlength > range->length)
604 lgp->args.minlength = range->length;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400605 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
Benny Halevyfb3296e2011-05-22 19:47:26 +0300606 lgp->args.range = *range;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400607 lgp->args.type = server->pnfs_curr_ld->id;
608 lgp->args.inode = ino;
609 lgp->args.ctx = get_nfs_open_context(ctx);
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400610 lgp->args.layout.pages = pages;
611 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400612 lgp->lsegpp = &lseg;
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400613 lgp->gfp_flags = gfp_flags;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400614
615 /* Synchronously retrieve layout information from server and
616 * store in lseg.
617 */
618 nfs4_proc_layoutget(lgp);
619 if (!lseg) {
620 /* remember that LAYOUTGET failed and suspend trying */
Benny Halevyfb3296e2011-05-22 19:47:26 +0300621 set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400622 }
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400623
624 /* free xdr pages */
625 for (i = 0; i < max_pages; i++)
626 __free_page(pages[i]);
627 kfree(pages);
628
Andy Adamson974cec82010-10-20 00:18:02 -0400629 return lseg;
Weston Andros Adamson35124a02011-03-24 16:48:21 -0400630
631out_err_free:
632 /* free any allocated xdr pages, lgp as it's not used */
633 if (pages) {
634 for (i = 0; i < max_pages; i++) {
635 if (!pages[i])
636 break;
637 __free_page(pages[i]);
638 }
639 kfree(pages);
640 }
641 kfree(lgp);
642 return NULL;
Andy Adamson974cec82010-10-20 00:18:02 -0400643}
644
Benny Halevycbe82602011-05-22 19:52:37 +0300645/* Initiates a LAYOUTRETURN(FILE) */
646int
647_pnfs_return_layout(struct inode *ino)
648{
649 struct pnfs_layout_hdr *lo = NULL;
650 struct nfs_inode *nfsi = NFS_I(ino);
651 LIST_HEAD(tmp_list);
652 struct nfs4_layoutreturn *lrp;
653 nfs4_stateid stateid;
654 int status = 0;
655
656 dprintk("--> %s\n", __func__);
657
658 spin_lock(&ino->i_lock);
659 lo = nfsi->layout;
Fred Isamana2e1d4f2011-06-13 18:54:53 -0400660 if (!lo) {
Benny Halevycbe82602011-05-22 19:52:37 +0300661 spin_unlock(&ino->i_lock);
Fred Isamana2e1d4f2011-06-13 18:54:53 -0400662 dprintk("%s: no layout to return\n", __func__);
663 return status;
Benny Halevycbe82602011-05-22 19:52:37 +0300664 }
665 stateid = nfsi->layout->plh_stateid;
666 /* Reference matched in nfs4_layoutreturn_release */
667 get_layout_hdr(lo);
Fred Isamanea0ded72011-06-15 12:31:02 -0400668 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
669 lo->plh_block_lgets++;
Benny Halevycbe82602011-05-22 19:52:37 +0300670 spin_unlock(&ino->i_lock);
671 pnfs_free_lseg_list(&tmp_list);
672
673 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
674
675 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
676 if (unlikely(lrp == NULL)) {
677 status = -ENOMEM;
Fred Isaman9e2dfdb2011-06-15 14:32:02 -0400678 set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
679 set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
Benny Halevy1ed3a852011-06-15 11:39:57 -0400680 put_layout_hdr(lo);
Benny Halevycbe82602011-05-22 19:52:37 +0300681 goto out;
682 }
683
684 lrp->args.stateid = stateid;
685 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
686 lrp->args.inode = ino;
Trond Myklebusta56aaa02011-06-15 11:59:10 -0400687 lrp->args.layout = lo;
Benny Halevycbe82602011-05-22 19:52:37 +0300688 lrp->clp = NFS_SERVER(ino)->nfs_client;
689
690 status = nfs4_proc_layoutreturn(lrp);
691out:
692 dprintk("<-- %s status: %d\n", __func__, status);
693 return status;
694}
695
Fred Isamanf7e89172011-01-06 11:36:32 +0000696bool pnfs_roc(struct inode *ino)
697{
698 struct pnfs_layout_hdr *lo;
699 struct pnfs_layout_segment *lseg, *tmp;
700 LIST_HEAD(tmp_list);
701 bool found = false;
702
703 spin_lock(&ino->i_lock);
704 lo = NFS_I(ino)->layout;
705 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
706 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
707 goto out_nolayout;
708 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
709 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
710 mark_lseg_invalid(lseg, &tmp_list);
711 found = true;
712 }
713 if (!found)
714 goto out_nolayout;
715 lo->plh_block_lgets++;
716 get_layout_hdr(lo); /* matched in pnfs_roc_release */
717 spin_unlock(&ino->i_lock);
718 pnfs_free_lseg_list(&tmp_list);
719 return true;
720
721out_nolayout:
722 spin_unlock(&ino->i_lock);
723 return false;
724}
725
726void pnfs_roc_release(struct inode *ino)
727{
728 struct pnfs_layout_hdr *lo;
729
730 spin_lock(&ino->i_lock);
731 lo = NFS_I(ino)->layout;
732 lo->plh_block_lgets--;
733 put_layout_hdr_locked(lo);
734 spin_unlock(&ino->i_lock);
735}
736
737void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
738{
739 struct pnfs_layout_hdr *lo;
740
741 spin_lock(&ino->i_lock);
742 lo = NFS_I(ino)->layout;
743 if ((int)(barrier - lo->plh_barrier) > 0)
744 lo->plh_barrier = barrier;
745 spin_unlock(&ino->i_lock);
746}
747
748bool pnfs_roc_drain(struct inode *ino, u32 *barrier)
749{
750 struct nfs_inode *nfsi = NFS_I(ino);
751 struct pnfs_layout_segment *lseg;
752 bool found = false;
753
754 spin_lock(&ino->i_lock);
755 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
756 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
757 found = true;
758 break;
759 }
760 if (!found) {
761 struct pnfs_layout_hdr *lo = nfsi->layout;
Trond Myklebust2d2f24a2012-03-04 18:13:57 -0500762 u32 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
Fred Isamanf7e89172011-01-06 11:36:32 +0000763
764 /* Since close does not return a layout stateid for use as
765 * a barrier, we choose the worst-case barrier.
766 */
767 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
768 }
769 spin_unlock(&ino->i_lock);
770 return found;
771}
772
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400773/*
774 * Compare two layout segments for sorting into layout cache.
775 * We want to preferentially return RW over RO layouts, so ensure those
776 * are seen first.
777 */
778static s64
Benny Halevyfb3296e2011-05-22 19:47:26 +0300779cmp_layout(struct pnfs_layout_range *l1,
780 struct pnfs_layout_range *l2)
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400781{
Benny Halevyfb3296e2011-05-22 19:47:26 +0300782 s64 d;
783
784 /* high offset > low offset */
785 d = l1->offset - l2->offset;
786 if (d)
787 return d;
788
789 /* short length > long length */
790 d = l2->length - l1->length;
791 if (d)
792 return d;
793
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400794 /* read > read/write */
Benny Halevyfb3296e2011-05-22 19:47:26 +0300795 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400796}
797
Andy Adamson974cec82010-10-20 00:18:02 -0400798static void
799pnfs_insert_layout(struct pnfs_layout_hdr *lo,
800 struct pnfs_layout_segment *lseg)
801{
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400802 struct pnfs_layout_segment *lp;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400803
Andy Adamson974cec82010-10-20 00:18:02 -0400804 dprintk("%s:Begin\n", __func__);
805
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000806 assert_spin_locked(&lo->plh_inode->i_lock);
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000807 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
Benny Halevyfb3296e2011-05-22 19:47:26 +0300808 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400809 continue;
Fred Isaman566052c2011-01-06 11:36:20 +0000810 list_add_tail(&lseg->pls_list, &lp->pls_list);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400811 dprintk("%s: inserted lseg %p "
812 "iomode %d offset %llu length %llu before "
813 "lp %p iomode %d offset %llu length %llu\n",
Fred Isaman566052c2011-01-06 11:36:20 +0000814 __func__, lseg, lseg->pls_range.iomode,
815 lseg->pls_range.offset, lseg->pls_range.length,
816 lp, lp->pls_range.iomode, lp->pls_range.offset,
817 lp->pls_range.length);
Benny Halevyfb3296e2011-05-22 19:47:26 +0300818 goto out;
Andy Adamson974cec82010-10-20 00:18:02 -0400819 }
Benny Halevyfb3296e2011-05-22 19:47:26 +0300820 list_add_tail(&lseg->pls_list, &lo->plh_segs);
821 dprintk("%s: inserted lseg %p "
822 "iomode %d offset %llu length %llu at tail\n",
823 __func__, lseg, lseg->pls_range.iomode,
824 lseg->pls_range.offset, lseg->pls_range.length);
825out:
Fred Isamancc6e5342011-01-06 11:36:28 +0000826 get_layout_hdr(lo);
Andy Adamson974cec82010-10-20 00:18:02 -0400827
828 dprintk("%s:Return\n", __func__);
Benny Halevye5e94012010-10-20 00:18:01 -0400829}
830
831static struct pnfs_layout_hdr *
Peng Tao9fa40752011-07-30 20:52:32 -0400832alloc_init_layout_hdr(struct inode *ino,
833 struct nfs_open_context *ctx,
834 gfp_t gfp_flags)
Benny Halevye5e94012010-10-20 00:18:01 -0400835{
836 struct pnfs_layout_hdr *lo;
837
Benny Halevy636fb9c2011-05-22 19:51:33 +0300838 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
Benny Halevye5e94012010-10-20 00:18:01 -0400839 if (!lo)
840 return NULL;
Fred Isamancc6e5342011-01-06 11:36:28 +0000841 atomic_set(&lo->plh_refcount, 1);
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000842 INIT_LIST_HEAD(&lo->plh_layouts);
843 INIT_LIST_HEAD(&lo->plh_segs);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000844 INIT_LIST_HEAD(&lo->plh_bulk_recall);
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000845 lo->plh_inode = ino;
Peng Tao9fa40752011-07-30 20:52:32 -0400846 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
Benny Halevye5e94012010-10-20 00:18:01 -0400847 return lo;
848}
849
850static struct pnfs_layout_hdr *
Peng Tao9fa40752011-07-30 20:52:32 -0400851pnfs_find_alloc_layout(struct inode *ino,
852 struct nfs_open_context *ctx,
853 gfp_t gfp_flags)
Benny Halevye5e94012010-10-20 00:18:01 -0400854{
855 struct nfs_inode *nfsi = NFS_I(ino);
856 struct pnfs_layout_hdr *new = NULL;
857
858 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
859
860 assert_spin_locked(&ino->i_lock);
Fred Isaman4541d162011-01-06 11:36:23 +0000861 if (nfsi->layout) {
862 if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
863 return NULL;
864 else
865 return nfsi->layout;
866 }
Benny Halevye5e94012010-10-20 00:18:01 -0400867 spin_unlock(&ino->i_lock);
Peng Tao9fa40752011-07-30 20:52:32 -0400868 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
Benny Halevye5e94012010-10-20 00:18:01 -0400869 spin_lock(&ino->i_lock);
870
871 if (likely(nfsi->layout == NULL)) /* Won the race? */
872 nfsi->layout = new;
873 else
Benny Halevy636fb9c2011-05-22 19:51:33 +0300874 pnfs_free_layout_hdr(new);
Benny Halevye5e94012010-10-20 00:18:01 -0400875 return nfsi->layout;
876}
877
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400878/*
879 * iomode matching rules:
880 * iomode lseg match
881 * ----- ----- -----
882 * ANY READ true
883 * ANY RW true
884 * RW READ false
885 * RW RW true
886 * READ READ true
887 * READ RW true
888 */
889static int
Benny Halevyfb3296e2011-05-22 19:47:26 +0300890is_matching_lseg(struct pnfs_layout_range *ls_range,
891 struct pnfs_layout_range *range)
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400892{
Benny Halevyfb3296e2011-05-22 19:47:26 +0300893 struct pnfs_layout_range range1;
894
895 if ((range->iomode == IOMODE_RW &&
896 ls_range->iomode != IOMODE_RW) ||
897 !lo_seg_intersecting(ls_range, range))
898 return 0;
899
900 /* range1 covers only the first byte in the range */
901 range1 = *range;
902 range1.length = 1;
903 return lo_seg_contained(ls_range, &range1);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400904}
905
906/*
907 * lookup range in layout
908 */
Benny Halevye5e94012010-10-20 00:18:01 -0400909static struct pnfs_layout_segment *
Benny Halevyfb3296e2011-05-22 19:47:26 +0300910pnfs_find_lseg(struct pnfs_layout_hdr *lo,
911 struct pnfs_layout_range *range)
Benny Halevye5e94012010-10-20 00:18:01 -0400912{
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400913 struct pnfs_layout_segment *lseg, *ret = NULL;
914
915 dprintk("%s:Begin\n", __func__);
916
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000917 assert_spin_locked(&lo->plh_inode->i_lock);
918 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
Fred Isaman4541d162011-01-06 11:36:23 +0000919 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
Benny Halevyfb3296e2011-05-22 19:47:26 +0300920 is_matching_lseg(&lseg->pls_range, range)) {
Fred Isamand684d2a2011-03-01 01:34:13 +0000921 ret = get_lseg(lseg);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400922 break;
923 }
Benny Halevyd771e3a2011-06-14 16:30:16 -0400924 if (lseg->pls_range.offset > range->offset)
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400925 break;
926 }
927
928 dprintk("%s:Return lseg %p ref %d\n",
Fred Isaman4541d162011-01-06 11:36:23 +0000929 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400930 return ret;
Benny Halevye5e94012010-10-20 00:18:01 -0400931}
932
933/*
934 * Layout segment is retreived from the server if not cached.
935 * The appropriate layout segment is referenced and returned to the caller.
936 */
Andy Adamson7c24d942011-06-13 18:22:38 -0400937struct pnfs_layout_segment *
Benny Halevye5e94012010-10-20 00:18:01 -0400938pnfs_update_layout(struct inode *ino,
939 struct nfs_open_context *ctx,
Benny Halevyfb3296e2011-05-22 19:47:26 +0300940 loff_t pos,
941 u64 count,
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400942 enum pnfs_iomode iomode,
943 gfp_t gfp_flags)
Benny Halevye5e94012010-10-20 00:18:01 -0400944{
Benny Halevyfb3296e2011-05-22 19:47:26 +0300945 struct pnfs_layout_range arg = {
946 .iomode = iomode,
947 .offset = pos,
948 .length = count,
949 };
Benny Halevy707ed5f2011-05-22 19:47:46 +0300950 unsigned pg_offset;
Benny Halevye5e94012010-10-20 00:18:01 -0400951 struct nfs_inode *nfsi = NFS_I(ino);
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400952 struct nfs_server *server = NFS_SERVER(ino);
953 struct nfs_client *clp = server->nfs_client;
Benny Halevye5e94012010-10-20 00:18:01 -0400954 struct pnfs_layout_hdr *lo;
955 struct pnfs_layout_segment *lseg = NULL;
Fred Isamanf49f9ba2011-02-03 18:28:52 +0000956 bool first = false;
Benny Halevye5e94012010-10-20 00:18:01 -0400957
958 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
959 return NULL;
960 spin_lock(&ino->i_lock);
Peng Tao9fa40752011-07-30 20:52:32 -0400961 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
Benny Halevye5e94012010-10-20 00:18:01 -0400962 if (lo == NULL) {
963 dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
964 goto out_unlock;
965 }
966
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000967 /* Do we even need to bother with this? */
Trond Myklebusta59c30a2012-03-01 11:17:47 -0500968 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000969 dprintk("%s matches recall, use MDS\n", __func__);
Benny Halevye5e94012010-10-20 00:18:01 -0400970 goto out_unlock;
971 }
972
973 /* if LAYOUTGET already failed once we don't try again */
Fred Isaman566052c2011-01-06 11:36:20 +0000974 if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
Benny Halevye5e94012010-10-20 00:18:01 -0400975 goto out_unlock;
976
Andy Adamson568e8c42011-03-01 01:34:22 +0000977 /* Check to see if the layout for the given range already exists */
Benny Halevyfb3296e2011-05-22 19:47:26 +0300978 lseg = pnfs_find_lseg(lo, &arg);
Andy Adamson568e8c42011-03-01 01:34:22 +0000979 if (lseg)
980 goto out_unlock;
981
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000982 if (pnfs_layoutgets_blocked(lo, NULL, 0))
Fred Isamancf7d63f2011-01-06 11:36:25 +0000983 goto out_unlock;
984 atomic_inc(&lo->plh_outstanding);
985
Fred Isamancc6e5342011-01-06 11:36:28 +0000986 get_layout_hdr(lo);
Fred Isamanf49f9ba2011-02-03 18:28:52 +0000987 if (list_empty(&lo->plh_segs))
988 first = true;
989 spin_unlock(&ino->i_lock);
990 if (first) {
Fred Isaman2130ff62011-01-06 11:36:26 +0000991 /* The lo must be on the clp list if there is any
992 * chance of a CB_LAYOUTRECALL(FILE) coming in.
993 */
994 spin_lock(&clp->cl_lock);
995 BUG_ON(!list_empty(&lo->plh_layouts));
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400996 list_add_tail(&lo->plh_layouts, &server->layouts);
Fred Isaman2130ff62011-01-06 11:36:26 +0000997 spin_unlock(&clp->cl_lock);
998 }
Benny Halevye5e94012010-10-20 00:18:01 -0400999
Benny Halevy707ed5f2011-05-22 19:47:46 +03001000 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1001 if (pg_offset) {
1002 arg.offset -= pg_offset;
1003 arg.length += pg_offset;
1004 }
Andy Adamson7c24d942011-06-13 18:22:38 -04001005 if (arg.length != NFS4_MAX_UINT64)
1006 arg.length = PAGE_CACHE_ALIGN(arg.length);
Benny Halevy707ed5f2011-05-22 19:47:46 +03001007
Benny Halevyfb3296e2011-05-22 19:47:26 +03001008 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
Fred Isamanf49f9ba2011-02-03 18:28:52 +00001009 if (!lseg && first) {
1010 spin_lock(&clp->cl_lock);
1011 list_del_init(&lo->plh_layouts);
1012 spin_unlock(&clp->cl_lock);
Fred Isaman2130ff62011-01-06 11:36:26 +00001013 }
Fred Isamancf7d63f2011-01-06 11:36:25 +00001014 atomic_dec(&lo->plh_outstanding);
Fred Isamancc6e5342011-01-06 11:36:28 +00001015 put_layout_hdr(lo);
Benny Halevye5e94012010-10-20 00:18:01 -04001016out:
1017 dprintk("%s end, state 0x%lx lseg %p\n", __func__,
Andy Adamsonbf9c1382011-03-01 01:34:07 +00001018 nfsi->layout ? nfsi->layout->plh_flags : -1, lseg);
Benny Halevye5e94012010-10-20 00:18:01 -04001019 return lseg;
1020out_unlock:
1021 spin_unlock(&ino->i_lock);
1022 goto out;
1023}
Andy Adamson7c24d942011-06-13 18:22:38 -04001024EXPORT_SYMBOL_GPL(pnfs_update_layout);
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001025
1026int
1027pnfs_layout_process(struct nfs4_layoutget *lgp)
1028{
1029 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1030 struct nfs4_layoutget_res *res = &lgp->res;
1031 struct pnfs_layout_segment *lseg;
Fred Isamanb7edfaa2011-01-06 11:36:21 +00001032 struct inode *ino = lo->plh_inode;
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001033 int status = 0;
1034
1035 /* Inject layout blob into I/O device driver */
Trond Myklebusta75b9df2011-05-11 18:00:51 -04001036 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001037 if (!lseg || IS_ERR(lseg)) {
1038 if (!lseg)
1039 status = -ENOMEM;
1040 else
1041 status = PTR_ERR(lseg);
1042 dprintk("%s: Could not allocate layout: error %d\n",
1043 __func__, status);
1044 goto out;
1045 }
1046
1047 spin_lock(&ino->i_lock);
Trond Myklebusta59c30a2012-03-01 11:17:47 -05001048 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
Fred Isaman43f1b3d2011-01-06 11:36:30 +00001049 dprintk("%s forget reply due to recall\n", __func__);
1050 goto out_forget_reply;
1051 }
1052
1053 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
1054 dprintk("%s forget reply due to state\n", __func__);
1055 goto out_forget_reply;
1056 }
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001057 init_lseg(lo, lseg);
Fred Isaman566052c2011-01-06 11:36:20 +00001058 lseg->pls_range = res->range;
Fred Isamand684d2a2011-03-01 01:34:13 +00001059 *lgp->lsegpp = get_lseg(lseg);
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001060 pnfs_insert_layout(lo, lseg);
1061
Fred Isamanf7e89172011-01-06 11:36:32 +00001062 if (res->return_on_close) {
1063 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1064 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1065 }
1066
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001067 /* Done processing layoutget. Set the layout stateid */
Fred Isaman43f1b3d2011-01-06 11:36:30 +00001068 pnfs_set_layout_stateid(lo, &res->stateid, false);
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001069 spin_unlock(&ino->i_lock);
1070out:
1071 return status;
Fred Isaman43f1b3d2011-01-06 11:36:30 +00001072
1073out_forget_reply:
1074 spin_unlock(&ino->i_lock);
1075 lseg->pls_layout = lo;
1076 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1077 goto out;
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001078}
1079
Trond Myklebustd8007d42011-06-10 13:30:23 -04001080void
1081pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1082{
1083 BUG_ON(pgio->pg_lseg != NULL);
1084
1085 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1086 req->wb_context,
1087 req_offset(req),
1088 req->wb_bytes,
1089 IOMODE_READ,
1090 GFP_KERNEL);
Trond Myklebuste885de12011-06-10 13:30:23 -04001091 /* If no lseg, fall back to read through mds */
1092 if (pgio->pg_lseg == NULL)
Trond Myklebust1f945352011-07-13 15:59:57 -04001093 nfs_pageio_reset_read_mds(pgio);
Trond Myklebuste885de12011-06-10 13:30:23 -04001094
Trond Myklebustd8007d42011-06-10 13:30:23 -04001095}
1096EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1097
1098void
1099pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1100{
1101 BUG_ON(pgio->pg_lseg != NULL);
1102
1103 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1104 req->wb_context,
1105 req_offset(req),
1106 req->wb_bytes,
1107 IOMODE_RW,
1108 GFP_NOFS);
Trond Myklebuste885de12011-06-10 13:30:23 -04001109 /* If no lseg, fall back to write through mds */
1110 if (pgio->pg_lseg == NULL)
Trond Myklebust1f945352011-07-13 15:59:57 -04001111 nfs_pageio_reset_write_mds(pgio);
Trond Myklebustd8007d42011-06-10 13:30:23 -04001112}
1113EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1114
Benny Halevy18ad0a92011-05-25 21:03:56 +03001115bool
Trond Myklebust1751c362011-06-10 13:30:23 -04001116pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
1117{
1118 struct nfs_server *server = NFS_SERVER(inode);
1119 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1120
1121 if (ld == NULL)
1122 return false;
1123 nfs_pageio_init(pgio, inode, ld->pg_read_ops, server->rsize, 0);
1124 return true;
1125}
1126
1127bool
1128pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
1129{
1130 struct nfs_server *server = NFS_SERVER(inode);
1131 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1132
1133 if (ld == NULL)
1134 return false;
1135 nfs_pageio_init(pgio, inode, ld->pg_write_ops, server->wsize, ioflags);
1136 return true;
1137}
1138
1139bool
Benny Halevydfed2062011-05-25 20:25:22 +03001140pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1141 struct nfs_page *req)
Fred Isamanbae724e2011-03-01 01:34:15 +00001142{
Trond Myklebustd8007d42011-06-10 13:30:23 -04001143 if (pgio->pg_lseg == NULL)
1144 return nfs_generic_pg_test(pgio, prev, req);
Benny Halevy89a58e32011-05-25 20:54:40 +03001145
Trond Myklebust19982ba2011-06-10 13:30:23 -04001146 /*
1147 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1148 * Note that this test makes several assumptions:
1149 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1150 * is known to lie within the range.
1151 * - that the nfs_page being tested is known to be contiguous with the
1152 * previous nfs_page.
1153 * - Layout ranges are page aligned, so we only have to test the
1154 * start offset of the request.
1155 *
1156 * Please also note that 'end_offset' is actually the offset of the
1157 * first byte that lies outside the pnfs_layout_range. FIXME?
1158 *
1159 */
1160 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1161 pgio->pg_lseg->pls_range.length);
Fred Isamanbae724e2011-03-01 01:34:15 +00001162}
Benny Halevy89a58e32011-05-25 20:54:40 +03001163EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
Fred Isamanbae724e2011-03-01 01:34:15 +00001164
Trond Myklebuste2fecb22012-01-06 08:57:46 -05001165static int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *head)
1166{
1167 struct nfs_pageio_descriptor pgio;
1168 LIST_HEAD(failed);
1169
1170 /* Resend all requests through the MDS */
1171 nfs_pageio_init_write_mds(&pgio, inode, FLUSH_STABLE);
1172 while (!list_empty(head)) {
1173 struct nfs_page *req = nfs_list_entry(head->next);
1174
1175 nfs_list_remove_request(req);
1176 if (!nfs_pageio_add_request(&pgio, req))
1177 nfs_list_add_request(req, &failed);
1178 }
1179 nfs_pageio_complete(&pgio);
1180
1181 if (!list_empty(&failed)) {
1182 /* For some reason our attempt to resend pages. Mark the
1183 * overall send request as having failed, and let
1184 * nfs_writeback_release_full deal with the error.
1185 */
1186 list_move(&failed, head);
1187 return -EIO;
1188 }
1189 return 0;
1190}
1191
Benny Halevyd20581a2011-05-22 19:52:03 +03001192/*
1193 * Called by non rpc-based layout drivers
1194 */
Peng Tao8ce160c2011-09-22 21:50:14 -04001195void pnfs_ld_write_done(struct nfs_write_data *data)
Fred Isaman94ad1c82011-03-01 01:34:14 +00001196{
Peng Tao8ce160c2011-09-22 21:50:14 -04001197 if (likely(!data->pnfs_error)) {
Benny Halevyd20581a2011-05-22 19:52:03 +03001198 pnfs_set_layoutcommit(data);
1199 data->mds_ops->rpc_call_done(&data->task, data);
Peng Tao8ce160c2011-09-22 21:50:14 -04001200 } else {
Peng Tao8ce160c2011-09-22 21:50:14 -04001201 dprintk("pnfs write error = %d\n", data->pnfs_error);
Boaz Harroshfe0fe832012-01-06 09:31:20 +02001202 if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
1203 PNFS_LAYOUTRET_ON_ERROR) {
1204 /* Don't lo_commit on error, Server will needs to
1205 * preform a file recovery.
1206 */
1207 clear_bit(NFS_INO_LAYOUTCOMMIT,
1208 &NFS_I(data->inode)->flags);
1209 pnfs_return_layout(data->inode);
1210 }
Trond Myklebuste2fecb22012-01-06 08:57:46 -05001211 data->task.tk_status = pnfs_write_done_resend_to_mds(data->inode, &data->pages);
Fred Isaman44b83792011-03-03 15:13:44 +00001212 }
Trond Myklebust8dd37752012-03-15 17:16:40 -04001213 put_lseg(data->lseg);
Peng Tao8ce160c2011-09-22 21:50:14 -04001214 data->mds_ops->rpc_release(data);
Fred Isaman44b83792011-03-03 15:13:44 +00001215}
Benny Halevyd20581a2011-05-22 19:52:03 +03001216EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
Fred Isaman44b83792011-03-03 15:13:44 +00001217
Trond Myklebustdce81292011-07-13 15:59:19 -04001218static void
1219pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1220 struct nfs_write_data *data)
1221{
1222 list_splice_tail_init(&data->pages, &desc->pg_list);
1223 if (data->req && list_empty(&data->req->wb_list))
1224 nfs_list_add_request(data->req, &desc->pg_list);
1225 nfs_pageio_reset_write_mds(desc);
1226 desc->pg_recoalesce = 1;
Trond Myklebust8dd37752012-03-15 17:16:40 -04001227 put_lseg(data->lseg);
Trond Myklebustdce81292011-07-13 15:59:19 -04001228 nfs_writedata_release(data);
1229}
1230
1231static enum pnfs_try_status
Andy Adamson0382b742011-03-03 15:13:45 +00001232pnfs_try_to_write_data(struct nfs_write_data *wdata,
Trond Myklebustdce81292011-07-13 15:59:19 -04001233 const struct rpc_call_ops *call_ops,
1234 struct pnfs_layout_segment *lseg,
1235 int how)
Andy Adamson0382b742011-03-03 15:13:45 +00001236{
1237 struct inode *inode = wdata->inode;
1238 enum pnfs_try_status trypnfs;
1239 struct nfs_server *nfss = NFS_SERVER(inode);
1240
1241 wdata->mds_ops = call_ops;
Trond Myklebustdce81292011-07-13 15:59:19 -04001242 wdata->lseg = get_lseg(lseg);
Andy Adamson0382b742011-03-03 15:13:45 +00001243
1244 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1245 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1246
1247 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1248 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1249 put_lseg(wdata->lseg);
1250 wdata->lseg = NULL;
1251 } else
1252 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1253
1254 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1255 return trypnfs;
1256}
1257
Trond Myklebustdce81292011-07-13 15:59:19 -04001258static void
1259pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1260{
1261 struct nfs_write_data *data;
1262 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1263 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1264
1265 desc->pg_lseg = NULL;
1266 while (!list_empty(head)) {
1267 enum pnfs_try_status trypnfs;
1268
1269 data = list_entry(head->next, struct nfs_write_data, list);
1270 list_del_init(&data->list);
1271
1272 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1273 if (trypnfs == PNFS_NOT_ATTEMPTED)
1274 pnfs_write_through_mds(desc, data);
1275 }
1276 put_lseg(lseg);
1277}
1278
1279int
1280pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1281{
1282 LIST_HEAD(head);
1283 int ret;
1284
1285 ret = nfs_generic_flush(desc, &head);
1286 if (ret != 0) {
1287 put_lseg(desc->pg_lseg);
1288 desc->pg_lseg = NULL;
1289 return ret;
1290 }
1291 pnfs_do_multiple_writes(desc, &head, desc->pg_ioflags);
1292 return 0;
1293}
1294EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1295
Trond Myklebust62e4a762011-11-10 14:30:37 -05001296static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
1297{
1298 struct nfs_pageio_descriptor pgio;
1299
1300 put_lseg(data->lseg);
1301 data->lseg = NULL;
1302 dprintk("pnfs write error = %d\n", data->pnfs_error);
Boaz Harroshfe0fe832012-01-06 09:31:20 +02001303 if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
1304 PNFS_LAYOUTRET_ON_ERROR)
1305 pnfs_return_layout(data->inode);
Trond Myklebust62e4a762011-11-10 14:30:37 -05001306
1307 nfs_pageio_init_read_mds(&pgio, data->inode);
1308
1309 while (!list_empty(&data->pages)) {
1310 struct nfs_page *req = nfs_list_entry(data->pages.next);
1311
1312 nfs_list_remove_request(req);
1313 nfs_pageio_add_request(&pgio, req);
1314 }
1315 nfs_pageio_complete(&pgio);
1316}
1317
Andy Adamsonb1f69b72010-10-20 00:18:03 -04001318/*
Benny Halevyd20581a2011-05-22 19:52:03 +03001319 * Called by non rpc-based layout drivers
1320 */
Peng Tao9b7eecd2011-09-22 21:50:15 -04001321void pnfs_ld_read_done(struct nfs_read_data *data)
Benny Halevyd20581a2011-05-22 19:52:03 +03001322{
Peng Tao9b7eecd2011-09-22 21:50:15 -04001323 if (likely(!data->pnfs_error)) {
Benny Halevyd20581a2011-05-22 19:52:03 +03001324 __nfs4_read_done_cb(data);
1325 data->mds_ops->rpc_call_done(&data->task, data);
Trond Myklebust62e4a762011-11-10 14:30:37 -05001326 } else
1327 pnfs_ld_handle_read_error(data);
Trond Myklebust8dd37752012-03-15 17:16:40 -04001328 put_lseg(data->lseg);
Peng Tao9b7eecd2011-09-22 21:50:15 -04001329 data->mds_ops->rpc_release(data);
Benny Halevyd20581a2011-05-22 19:52:03 +03001330}
1331EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1332
Trond Myklebust493292d2011-07-13 15:58:28 -04001333static void
1334pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1335 struct nfs_read_data *data)
1336{
1337 list_splice_tail_init(&data->pages, &desc->pg_list);
1338 if (data->req && list_empty(&data->req->wb_list))
1339 nfs_list_add_request(data->req, &desc->pg_list);
1340 nfs_pageio_reset_read_mds(desc);
1341 desc->pg_recoalesce = 1;
1342 nfs_readdata_release(data);
1343}
1344
Benny Halevyd20581a2011-05-22 19:52:03 +03001345/*
Andy Adamson64419a92011-03-01 01:34:16 +00001346 * Call the appropriate parallel I/O subsystem read function.
1347 */
Trond Myklebust493292d2011-07-13 15:58:28 -04001348static enum pnfs_try_status
Andy Adamson64419a92011-03-01 01:34:16 +00001349pnfs_try_to_read_data(struct nfs_read_data *rdata,
Trond Myklebust493292d2011-07-13 15:58:28 -04001350 const struct rpc_call_ops *call_ops,
1351 struct pnfs_layout_segment *lseg)
Andy Adamson64419a92011-03-01 01:34:16 +00001352{
1353 struct inode *inode = rdata->inode;
1354 struct nfs_server *nfss = NFS_SERVER(inode);
1355 enum pnfs_try_status trypnfs;
1356
1357 rdata->mds_ops = call_ops;
Trond Myklebust493292d2011-07-13 15:58:28 -04001358 rdata->lseg = get_lseg(lseg);
Andy Adamson64419a92011-03-01 01:34:16 +00001359
1360 dprintk("%s: Reading ino:%lu %u@%llu\n",
1361 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1362
1363 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1364 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1365 put_lseg(rdata->lseg);
1366 rdata->lseg = NULL;
1367 } else {
1368 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1369 }
1370 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1371 return trypnfs;
1372}
Andy Adamson863a3c62011-03-23 13:27:54 +00001373
Trond Myklebust493292d2011-07-13 15:58:28 -04001374static void
1375pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1376{
1377 struct nfs_read_data *data;
1378 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1379 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1380
1381 desc->pg_lseg = NULL;
1382 while (!list_empty(head)) {
1383 enum pnfs_try_status trypnfs;
1384
1385 data = list_entry(head->next, struct nfs_read_data, list);
1386 list_del_init(&data->list);
1387
1388 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1389 if (trypnfs == PNFS_NOT_ATTEMPTED)
1390 pnfs_read_through_mds(desc, data);
1391 }
1392 put_lseg(lseg);
1393}
1394
1395int
1396pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1397{
1398 LIST_HEAD(head);
1399 int ret;
1400
1401 ret = nfs_generic_pagein(desc, &head);
1402 if (ret != 0) {
1403 put_lseg(desc->pg_lseg);
1404 desc->pg_lseg = NULL;
1405 return ret;
1406 }
1407 pnfs_do_multiple_reads(desc, &head);
1408 return 0;
1409}
1410EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1411
Andy Adamson863a3c62011-03-23 13:27:54 +00001412/*
Peng Taoa9bae562011-07-30 20:52:33 -04001413 * There can be multiple RW segments.
Andy Adamson863a3c62011-03-23 13:27:54 +00001414 */
Peng Taoa9bae562011-07-30 20:52:33 -04001415static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
Andy Adamson863a3c62011-03-23 13:27:54 +00001416{
Peng Taoa9bae562011-07-30 20:52:33 -04001417 struct pnfs_layout_segment *lseg;
Andy Adamson863a3c62011-03-23 13:27:54 +00001418
Peng Taoa9bae562011-07-30 20:52:33 -04001419 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1420 if (lseg->pls_range.iomode == IOMODE_RW &&
1421 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1422 list_add(&lseg->pls_lc_list, listp);
1423 }
Andy Adamson863a3c62011-03-23 13:27:54 +00001424}
1425
Peng Tao1b0ae062011-09-22 21:50:12 -04001426void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
1427{
1428 if (lseg->pls_range.iomode == IOMODE_RW) {
1429 dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
1430 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
1431 } else {
1432 dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
1433 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
1434 }
1435}
1436EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
1437
Andy Adamson863a3c62011-03-23 13:27:54 +00001438void
1439pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1440{
1441 struct nfs_inode *nfsi = NFS_I(wdata->inode);
Vitaliy Gusev4b8ee2b2011-05-20 01:34:46 +04001442 loff_t end_pos = wdata->mds_offset + wdata->res.count;
Weston Andros Adamson79a48a12011-04-13 10:53:51 -04001443 bool mark_as_dirty = false;
Andy Adamson863a3c62011-03-23 13:27:54 +00001444
1445 spin_lock(&nfsi->vfs_inode.i_lock);
1446 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
Weston Andros Adamson79a48a12011-04-13 10:53:51 -04001447 mark_as_dirty = true;
Andy Adamson863a3c62011-03-23 13:27:54 +00001448 dprintk("%s: Set layoutcommit for inode %lu ",
1449 __func__, wdata->inode->i_ino);
1450 }
Peng Taoa9bae562011-07-30 20:52:33 -04001451 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &wdata->lseg->pls_flags)) {
1452 /* references matched in nfs4_layoutcommit_release */
1453 get_lseg(wdata->lseg);
1454 }
Peng Taoacff58802011-07-30 20:52:31 -04001455 if (end_pos > nfsi->layout->plh_lwb)
1456 nfsi->layout->plh_lwb = end_pos;
Andy Adamson863a3c62011-03-23 13:27:54 +00001457 spin_unlock(&nfsi->vfs_inode.i_lock);
Peng Taoacff58802011-07-30 20:52:31 -04001458 dprintk("%s: lseg %p end_pos %llu\n",
1459 __func__, wdata->lseg, nfsi->layout->plh_lwb);
Weston Andros Adamson79a48a12011-04-13 10:53:51 -04001460
1461 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1462 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1463 if (mark_as_dirty)
1464 mark_inode_dirty_sync(wdata->inode);
Andy Adamson863a3c62011-03-23 13:27:54 +00001465}
1466EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1467
Andy Adamsondb29c082011-07-30 20:52:38 -04001468void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1469{
1470 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1471
1472 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1473 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1474}
1475
Andy Adamsonde4b15c2011-03-12 02:58:09 -05001476/*
1477 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1478 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1479 * data to disk to allow the server to recover the data if it crashes.
1480 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1481 * is off, and a COMMIT is sent to a data server, or
1482 * if WRITEs to a data server return NFS_DATA_SYNC.
1483 */
Andy Adamson863a3c62011-03-23 13:27:54 +00001484int
Andy Adamsonef311532011-03-12 02:58:10 -05001485pnfs_layoutcommit_inode(struct inode *inode, bool sync)
Andy Adamson863a3c62011-03-23 13:27:54 +00001486{
1487 struct nfs4_layoutcommit_data *data;
1488 struct nfs_inode *nfsi = NFS_I(inode);
Andy Adamson863a3c62011-03-23 13:27:54 +00001489 loff_t end_pos;
1490 int status = 0;
1491
1492 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1493
Andy Adamsonde4b15c2011-03-12 02:58:09 -05001494 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1495 return 0;
1496
Andy Adamson863a3c62011-03-23 13:27:54 +00001497 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1498 data = kzalloc(sizeof(*data), GFP_NOFS);
Andy Adamsonde4b15c2011-03-12 02:58:09 -05001499 if (!data) {
Andy Adamsonde4b15c2011-03-12 02:58:09 -05001500 status = -ENOMEM;
1501 goto out;
1502 }
Andy Adamson863a3c62011-03-23 13:27:54 +00001503
Peng Tao92407e72011-10-23 20:21:17 -07001504 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1505 goto out_free;
1506
1507 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
1508 if (!sync) {
1509 status = -EAGAIN;
1510 goto out_free;
1511 }
1512 status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING,
1513 nfs_wait_bit_killable, TASK_KILLABLE);
1514 if (status)
1515 goto out_free;
1516 }
1517
Peng Taoa9bae562011-07-30 20:52:33 -04001518 INIT_LIST_HEAD(&data->lseg_list);
Andy Adamsonde4b15c2011-03-12 02:58:09 -05001519 spin_lock(&inode->i_lock);
Andy Adamson863a3c62011-03-23 13:27:54 +00001520 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
Peng Tao92407e72011-10-23 20:21:17 -07001521 clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags);
Andy Adamson863a3c62011-03-23 13:27:54 +00001522 spin_unlock(&inode->i_lock);
Peng Tao92407e72011-10-23 20:21:17 -07001523 wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING);
1524 goto out_free;
Andy Adamson863a3c62011-03-23 13:27:54 +00001525 }
Peng Taoa9bae562011-07-30 20:52:33 -04001526
1527 pnfs_list_write_lseg(inode, &data->lseg_list);
Andy Adamson863a3c62011-03-23 13:27:54 +00001528
Peng Taoacff58802011-07-30 20:52:31 -04001529 end_pos = nfsi->layout->plh_lwb;
Peng Taoacff58802011-07-30 20:52:31 -04001530 nfsi->layout->plh_lwb = 0;
Andy Adamson863a3c62011-03-23 13:27:54 +00001531
Trond Myklebustf597c532012-03-04 18:13:56 -05001532 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
Andy Adamson863a3c62011-03-23 13:27:54 +00001533 spin_unlock(&inode->i_lock);
1534
1535 data->args.inode = inode;
Peng Tao9fa40752011-07-30 20:52:32 -04001536 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
Andy Adamson863a3c62011-03-23 13:27:54 +00001537 nfs_fattr_init(&data->fattr);
1538 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1539 data->res.fattr = &data->fattr;
1540 data->args.lastbytewritten = end_pos - 1;
1541 data->res.server = NFS_SERVER(inode);
1542
1543 status = nfs4_proc_layoutcommit(data, sync);
1544out:
Peng Tao92407e72011-10-23 20:21:17 -07001545 if (status)
1546 mark_inode_dirty_sync(inode);
Andy Adamson863a3c62011-03-23 13:27:54 +00001547 dprintk("<-- %s status %d\n", __func__, status);
1548 return status;
Peng Tao92407e72011-10-23 20:21:17 -07001549out_free:
1550 kfree(data);
1551 goto out;
Andy Adamson863a3c62011-03-23 13:27:54 +00001552}