Commit | Line | Data |
---|---|---|
85e174ba RL |
1 | /* |
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> | |
493292dd | 31 | #include <linux/nfs_page.h> |
143cb494 | 32 | #include <linux/module.h> |
974cec8c | 33 | #include "internal.h" |
85e174ba | 34 | #include "pnfs.h" |
64419a9b | 35 | #include "iostat.h" |
85e174ba RL |
36 | |
37 | #define NFSDBG_FACILITY NFSDBG_PNFS | |
25c75333 | 38 | #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) |
85e174ba | 39 | |
02c35fca FI |
40 | /* Locking: |
41 | * | |
42 | * pnfs_spinlock: | |
43 | * protects pnfs_modules_tbl. | |
44 | */ | |
45 | static DEFINE_SPINLOCK(pnfs_spinlock); | |
46 | ||
47 | /* | |
48 | * pnfs_modules_tbl holds all pnfs modules | |
49 | */ | |
50 | static LIST_HEAD(pnfs_modules_tbl); | |
51 | ||
52 | /* Return the registered pnfs layout driver module matching given id */ | |
53 | static struct pnfs_layoutdriver_type * | |
54 | find_pnfs_driver_locked(u32 id) | |
55 | { | |
56 | struct pnfs_layoutdriver_type *local; | |
57 | ||
58 | list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) | |
59 | if (local->id == id) | |
60 | goto out; | |
61 | local = NULL; | |
62 | out: | |
63 | dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); | |
64 | return local; | |
65 | } | |
66 | ||
85e174ba RL |
67 | static struct pnfs_layoutdriver_type * |
68 | find_pnfs_driver(u32 id) | |
69 | { | |
02c35fca FI |
70 | struct pnfs_layoutdriver_type *local; |
71 | ||
72 | spin_lock(&pnfs_spinlock); | |
73 | local = find_pnfs_driver_locked(id); | |
0a9c63fa TM |
74 | if (local != NULL && !try_module_get(local->owner)) { |
75 | dprintk("%s: Could not grab reference on module\n", __func__); | |
76 | local = NULL; | |
77 | } | |
02c35fca FI |
78 | spin_unlock(&pnfs_spinlock); |
79 | return local; | |
85e174ba RL |
80 | } |
81 | ||
82 | void | |
83 | unset_pnfs_layoutdriver(struct nfs_server *nfss) | |
84 | { | |
738fd0f3 BH |
85 | if (nfss->pnfs_curr_ld) { |
86 | if (nfss->pnfs_curr_ld->clear_layoutdriver) | |
87 | nfss->pnfs_curr_ld->clear_layoutdriver(nfss); | |
2a4c8994 TM |
88 | /* Decrement the MDS count. Purge the deviceid cache if zero */ |
89 | if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) | |
90 | nfs4_deviceid_purge_client(nfss->nfs_client); | |
02c35fca | 91 | module_put(nfss->pnfs_curr_ld->owner); |
738fd0f3 | 92 | } |
85e174ba RL |
93 | nfss->pnfs_curr_ld = NULL; |
94 | } | |
95 | ||
96 | /* | |
97 | * Try to set the server's pnfs module to the pnfs layout type specified by id. | |
98 | * Currently only one pNFS layout driver per filesystem is supported. | |
99 | * | |
100 | * @id layout type. Zero (illegal layout type) indicates pNFS not in use. | |
101 | */ | |
102 | void | |
738fd0f3 BH |
103 | set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, |
104 | u32 id) | |
85e174ba RL |
105 | { |
106 | struct pnfs_layoutdriver_type *ld_type = NULL; | |
107 | ||
108 | if (id == 0) | |
109 | goto out_no_driver; | |
110 | if (!(server->nfs_client->cl_exchange_flags & | |
111 | (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { | |
a030889a WAA |
112 | printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n", |
113 | __func__, id, server->nfs_client->cl_exchange_flags); | |
85e174ba RL |
114 | goto out_no_driver; |
115 | } | |
116 | ld_type = find_pnfs_driver(id); | |
117 | if (!ld_type) { | |
118 | request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); | |
119 | ld_type = find_pnfs_driver(id); | |
120 | if (!ld_type) { | |
121 | dprintk("%s: No pNFS module found for %u.\n", | |
122 | __func__, id); | |
123 | goto out_no_driver; | |
124 | } | |
125 | } | |
126 | server->pnfs_curr_ld = ld_type; | |
738fd0f3 BH |
127 | if (ld_type->set_layoutdriver |
128 | && ld_type->set_layoutdriver(server, mntfh)) { | |
a030889a WAA |
129 | printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " |
130 | "driver %u.\n", __func__, id); | |
738fd0f3 BH |
131 | module_put(ld_type->owner); |
132 | goto out_no_driver; | |
133 | } | |
2a4c8994 TM |
134 | /* Bump the MDS count */ |
135 | atomic_inc(&server->nfs_client->cl_mds_count); | |
ea8eecdd | 136 | |
85e174ba RL |
137 | dprintk("%s: pNFS module for %u set\n", __func__, id); |
138 | return; | |
139 | ||
140 | out_no_driver: | |
141 | dprintk("%s: Using NFSv4 I/O\n", __func__); | |
142 | server->pnfs_curr_ld = NULL; | |
143 | } | |
02c35fca FI |
144 | |
145 | int | |
146 | pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) | |
147 | { | |
148 | int status = -EINVAL; | |
149 | struct pnfs_layoutdriver_type *tmp; | |
150 | ||
151 | if (ld_type->id == 0) { | |
a030889a | 152 | printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); |
02c35fca FI |
153 | return status; |
154 | } | |
b1f69b75 | 155 | if (!ld_type->alloc_lseg || !ld_type->free_lseg) { |
a030889a | 156 | printk(KERN_ERR "NFS: %s Layout driver must provide " |
b1f69b75 AA |
157 | "alloc_lseg and free_lseg.\n", __func__); |
158 | return status; | |
159 | } | |
02c35fca FI |
160 | |
161 | spin_lock(&pnfs_spinlock); | |
162 | tmp = find_pnfs_driver_locked(ld_type->id); | |
163 | if (!tmp) { | |
164 | list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); | |
165 | status = 0; | |
166 | dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, | |
167 | ld_type->name); | |
168 | } else { | |
a030889a | 169 | printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", |
02c35fca FI |
170 | __func__, ld_type->id); |
171 | } | |
172 | spin_unlock(&pnfs_spinlock); | |
173 | ||
174 | return status; | |
175 | } | |
176 | EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); | |
177 | ||
178 | void | |
179 | pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) | |
180 | { | |
181 | dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); | |
182 | spin_lock(&pnfs_spinlock); | |
183 | list_del(&ld_type->pnfs_tblid); | |
184 | spin_unlock(&pnfs_spinlock); | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); | |
e5e94017 | 187 | |
b1f69b75 AA |
188 | /* |
189 | * pNFS client layout cache | |
190 | */ | |
191 | ||
cc6e5340 | 192 | /* Need to hold i_lock if caller does not already hold reference */ |
43f1b3da | 193 | void |
70c3bd2b | 194 | pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) |
e5e94017 | 195 | { |
cc6e5340 | 196 | atomic_inc(&lo->plh_refcount); |
e5e94017 BH |
197 | } |
198 | ||
636fb9c8 BH |
199 | static struct pnfs_layout_hdr * |
200 | pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) | |
201 | { | |
202 | struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; | |
57934278 | 203 | return ld->alloc_layout_hdr(ino, gfp_flags); |
636fb9c8 BH |
204 | } |
205 | ||
206 | static void | |
207 | pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
208 | { | |
9c626381 TM |
209 | struct nfs_server *server = NFS_SERVER(lo->plh_inode); |
210 | struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; | |
211 | ||
212 | if (!list_empty(&lo->plh_layouts)) { | |
213 | struct nfs_client *clp = server->nfs_client; | |
214 | ||
215 | spin_lock(&clp->cl_lock); | |
216 | list_del_init(&lo->plh_layouts); | |
217 | spin_unlock(&clp->cl_lock); | |
218 | } | |
9fa40758 | 219 | put_rpccred(lo->plh_lc_cred); |
57934278 | 220 | return ld->free_layout_hdr(lo); |
636fb9c8 BH |
221 | } |
222 | ||
e5e94017 | 223 | static void |
6622c3ea | 224 | pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) |
e5e94017 | 225 | { |
bb346f63 | 226 | struct nfs_inode *nfsi = NFS_I(lo->plh_inode); |
cc6e5340 | 227 | dprintk("%s: freeing layout cache %p\n", __func__, lo); |
bb346f63 TM |
228 | nfsi->layout = NULL; |
229 | /* Reset MDS Threshold I/O counters */ | |
230 | nfsi->write_io = 0; | |
231 | nfsi->read_io = 0; | |
e5e94017 BH |
232 | } |
233 | ||
b1f69b75 | 234 | void |
70c3bd2b | 235 | pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) |
974cec8c | 236 | { |
cc6e5340 FI |
237 | struct inode *inode = lo->plh_inode; |
238 | ||
239 | if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { | |
6622c3ea | 240 | pnfs_detach_layout_hdr(lo); |
cc6e5340 | 241 | spin_unlock(&inode->i_lock); |
6622c3ea | 242 | pnfs_free_layout_hdr(lo); |
cc6e5340 | 243 | } |
974cec8c AA |
244 | } |
245 | ||
b9e028fd TM |
246 | static int |
247 | pnfs_iomode_to_fail_bit(u32 iomode) | |
248 | { | |
249 | return iomode == IOMODE_RW ? | |
250 | NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; | |
251 | } | |
252 | ||
253 | static void | |
3e621214 | 254 | pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) |
b9e028fd | 255 | { |
25c75333 | 256 | lo->plh_retry_timestamp = jiffies; |
3e621214 TM |
257 | if (test_and_set_bit(fail_bit, &lo->plh_flags)) |
258 | atomic_inc(&lo->plh_refcount); | |
259 | } | |
260 | ||
261 | static void | |
262 | pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) | |
263 | { | |
264 | if (test_and_clear_bit(fail_bit, &lo->plh_flags)) | |
265 | atomic_dec(&lo->plh_refcount); | |
266 | } | |
267 | ||
268 | static void | |
269 | pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) | |
270 | { | |
271 | struct inode *inode = lo->plh_inode; | |
115ce575 TM |
272 | struct pnfs_layout_range range = { |
273 | .iomode = iomode, | |
274 | .offset = 0, | |
275 | .length = NFS4_MAX_UINT64, | |
276 | }; | |
277 | LIST_HEAD(head); | |
3e621214 TM |
278 | |
279 | spin_lock(&inode->i_lock); | |
280 | pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); | |
115ce575 | 281 | pnfs_mark_matching_lsegs_invalid(lo, &head, &range); |
3e621214 | 282 | spin_unlock(&inode->i_lock); |
115ce575 | 283 | pnfs_free_lseg_list(&head); |
b9e028fd TM |
284 | dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, |
285 | iomode == IOMODE_RW ? "RW" : "READ"); | |
286 | } | |
287 | ||
288 | static bool | |
289 | pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) | |
290 | { | |
25c75333 | 291 | unsigned long start, end; |
3e621214 TM |
292 | int fail_bit = pnfs_iomode_to_fail_bit(iomode); |
293 | ||
294 | if (test_bit(fail_bit, &lo->plh_flags) == 0) | |
25c75333 TM |
295 | return false; |
296 | end = jiffies; | |
297 | start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; | |
298 | if (!time_in_range(lo->plh_retry_timestamp, start, end)) { | |
299 | /* It is time to retry the failed layoutgets */ | |
3e621214 | 300 | pnfs_layout_clear_fail_bit(lo, fail_bit); |
25c75333 TM |
301 | return false; |
302 | } | |
303 | return true; | |
b9e028fd TM |
304 | } |
305 | ||
974cec8c AA |
306 | static void |
307 | init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) | |
308 | { | |
566052c5 | 309 | INIT_LIST_HEAD(&lseg->pls_list); |
a9bae566 | 310 | INIT_LIST_HEAD(&lseg->pls_lc_list); |
4541d16c FI |
311 | atomic_set(&lseg->pls_refcount, 1); |
312 | smp_mb(); | |
313 | set_bit(NFS_LSEG_VALID, &lseg->pls_flags); | |
566052c5 | 314 | lseg->pls_layout = lo; |
974cec8c AA |
315 | } |
316 | ||
905ca191 | 317 | static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) |
974cec8c | 318 | { |
b7edfaa1 | 319 | struct inode *ino = lseg->pls_layout->plh_inode; |
974cec8c | 320 | |
b1f69b75 | 321 | NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); |
974cec8c AA |
322 | } |
323 | ||
d684d2ae | 324 | static void |
57036a37 TM |
325 | pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, |
326 | struct pnfs_layout_segment *lseg) | |
d684d2ae | 327 | { |
57036a37 | 328 | struct inode *inode = lo->plh_inode; |
d684d2ae | 329 | |
d20581aa | 330 | WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
d684d2ae | 331 | list_del_init(&lseg->pls_list); |
8f0d27dc TM |
332 | /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ |
333 | atomic_dec(&lo->plh_refcount); | |
173f77e9 TM |
334 | if (list_empty(&lo->plh_segs)) |
335 | clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); | |
d684d2ae FI |
336 | rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); |
337 | } | |
338 | ||
bae724ef | 339 | void |
9369a431 | 340 | pnfs_put_lseg(struct pnfs_layout_segment *lseg) |
974cec8c | 341 | { |
57036a37 | 342 | struct pnfs_layout_hdr *lo; |
d684d2ae FI |
343 | struct inode *inode; |
344 | ||
345 | if (!lseg) | |
346 | return; | |
347 | ||
4541d16c FI |
348 | dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, |
349 | atomic_read(&lseg->pls_refcount), | |
350 | test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); | |
57036a37 TM |
351 | lo = lseg->pls_layout; |
352 | inode = lo->plh_inode; | |
d684d2ae | 353 | if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { |
8f0d27dc | 354 | pnfs_get_layout_hdr(lo); |
57036a37 | 355 | pnfs_layout_remove_lseg(lo, lseg); |
d684d2ae | 356 | spin_unlock(&inode->i_lock); |
905ca191 | 357 | pnfs_free_lseg(lseg); |
8f0d27dc | 358 | pnfs_put_layout_hdr(lo); |
4541d16c | 359 | } |
4541d16c | 360 | } |
9369a431 | 361 | EXPORT_SYMBOL_GPL(pnfs_put_lseg); |
974cec8c | 362 | |
fb3296eb BH |
363 | static inline u64 |
364 | end_offset(u64 start, u64 len) | |
365 | { | |
366 | u64 end; | |
367 | ||
368 | end = start + len; | |
369 | return end >= start ? end : NFS4_MAX_UINT64; | |
370 | } | |
371 | ||
372 | /* last octet in a range */ | |
373 | static inline u64 | |
374 | last_byte_offset(u64 start, u64 len) | |
375 | { | |
376 | u64 end; | |
377 | ||
378 | BUG_ON(!len); | |
379 | end = start + len; | |
380 | return end > start ? end - 1 : NFS4_MAX_UINT64; | |
381 | } | |
382 | ||
383 | /* | |
384 | * is l2 fully contained in l1? | |
385 | * start1 end1 | |
386 | * [----------------------------------) | |
387 | * start2 end2 | |
388 | * [----------------) | |
389 | */ | |
390 | static inline int | |
391 | lo_seg_contained(struct pnfs_layout_range *l1, | |
392 | struct pnfs_layout_range *l2) | |
393 | { | |
394 | u64 start1 = l1->offset; | |
395 | u64 end1 = end_offset(start1, l1->length); | |
396 | u64 start2 = l2->offset; | |
397 | u64 end2 = end_offset(start2, l2->length); | |
398 | ||
399 | return (start1 <= start2) && (end1 >= end2); | |
400 | } | |
401 | ||
402 | /* | |
403 | * is l1 and l2 intersecting? | |
404 | * start1 end1 | |
405 | * [----------------------------------) | |
406 | * start2 end2 | |
407 | * [----------------) | |
408 | */ | |
409 | static inline int | |
410 | lo_seg_intersecting(struct pnfs_layout_range *l1, | |
411 | struct pnfs_layout_range *l2) | |
412 | { | |
413 | u64 start1 = l1->offset; | |
414 | u64 end1 = end_offset(start1, l1->length); | |
415 | u64 start2 = l2->offset; | |
416 | u64 end2 = end_offset(start2, l2->length); | |
417 | ||
418 | return (end1 == NFS4_MAX_UINT64 || end1 > start2) && | |
419 | (end2 == NFS4_MAX_UINT64 || end2 > start1); | |
420 | } | |
421 | ||
4541d16c | 422 | static bool |
778b5502 BH |
423 | should_free_lseg(struct pnfs_layout_range *lseg_range, |
424 | struct pnfs_layout_range *recall_range) | |
4541d16c | 425 | { |
778b5502 BH |
426 | return (recall_range->iomode == IOMODE_ANY || |
427 | lseg_range->iomode == recall_range->iomode) && | |
428 | lo_seg_intersecting(lseg_range, recall_range); | |
974cec8c AA |
429 | } |
430 | ||
4541d16c FI |
431 | /* Returns 1 if lseg is removed from list, 0 otherwise */ |
432 | static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, | |
433 | struct list_head *tmp_list) | |
434 | { | |
435 | int rv = 0; | |
436 | ||
437 | if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { | |
438 | /* Remove the reference keeping the lseg in the | |
439 | * list. It will now be removed when all | |
440 | * outstanding io is finished. | |
441 | */ | |
d684d2ae FI |
442 | dprintk("%s: lseg %p ref %d\n", __func__, lseg, |
443 | atomic_read(&lseg->pls_refcount)); | |
444 | if (atomic_dec_and_test(&lseg->pls_refcount)) { | |
57036a37 | 445 | pnfs_layout_remove_lseg(lseg->pls_layout, lseg); |
d684d2ae FI |
446 | list_add(&lseg->pls_list, tmp_list); |
447 | rv = 1; | |
448 | } | |
4541d16c FI |
449 | } |
450 | return rv; | |
451 | } | |
452 | ||
453 | /* Returns count of number of matching invalid lsegs remaining in list | |
454 | * after call. | |
455 | */ | |
43f1b3da | 456 | int |
49a85061 | 457 | pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
4541d16c | 458 | struct list_head *tmp_list, |
778b5502 | 459 | struct pnfs_layout_range *recall_range) |
974cec8c AA |
460 | { |
461 | struct pnfs_layout_segment *lseg, *next; | |
4541d16c | 462 | int invalid = 0, removed = 0; |
974cec8c AA |
463 | |
464 | dprintk("%s:Begin lo %p\n", __func__, lo); | |
465 | ||
8006bfba | 466 | if (list_empty(&lo->plh_segs)) |
38511722 | 467 | return 0; |
4541d16c | 468 | list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
778b5502 BH |
469 | if (!recall_range || |
470 | should_free_lseg(&lseg->pls_range, recall_range)) { | |
4541d16c FI |
471 | dprintk("%s: freeing lseg %p iomode %d " |
472 | "offset %llu length %llu\n", __func__, | |
473 | lseg, lseg->pls_range.iomode, lseg->pls_range.offset, | |
474 | lseg->pls_range.length); | |
475 | invalid++; | |
476 | removed += mark_lseg_invalid(lseg, tmp_list); | |
477 | } | |
478 | dprintk("%s:Return %i\n", __func__, invalid - removed); | |
479 | return invalid - removed; | |
974cec8c AA |
480 | } |
481 | ||
f49f9baa | 482 | /* note free_me must contain lsegs from a single layout_hdr */ |
43f1b3da | 483 | void |
4541d16c | 484 | pnfs_free_lseg_list(struct list_head *free_me) |
974cec8c | 485 | { |
4541d16c | 486 | struct pnfs_layout_segment *lseg, *tmp; |
f49f9baa FI |
487 | |
488 | if (list_empty(free_me)) | |
489 | return; | |
490 | ||
4541d16c | 491 | list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { |
566052c5 | 492 | list_del(&lseg->pls_list); |
905ca191 | 493 | pnfs_free_lseg(lseg); |
974cec8c AA |
494 | } |
495 | } | |
496 | ||
e5e94017 BH |
497 | void |
498 | pnfs_destroy_layout(struct nfs_inode *nfsi) | |
499 | { | |
500 | struct pnfs_layout_hdr *lo; | |
974cec8c | 501 | LIST_HEAD(tmp_list); |
e5e94017 BH |
502 | |
503 | spin_lock(&nfsi->vfs_inode.i_lock); | |
504 | lo = nfsi->layout; | |
505 | if (lo) { | |
38511722 | 506 | lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ |
49a85061 | 507 | pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL); |
3e621214 TM |
508 | pnfs_get_layout_hdr(lo); |
509 | pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); | |
510 | pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); | |
511 | spin_unlock(&nfsi->vfs_inode.i_lock); | |
512 | pnfs_free_lseg_list(&tmp_list); | |
513 | pnfs_put_layout_hdr(lo); | |
514 | } else | |
515 | spin_unlock(&nfsi->vfs_inode.i_lock); | |
974cec8c | 516 | } |
041245c8 | 517 | EXPORT_SYMBOL_GPL(pnfs_destroy_layout); |
974cec8c AA |
518 | |
519 | /* | |
520 | * Called by the state manger to remove all layouts established under an | |
521 | * expired lease. | |
522 | */ | |
523 | void | |
524 | pnfs_destroy_all_layouts(struct nfs_client *clp) | |
525 | { | |
6382a441 | 526 | struct nfs_server *server; |
974cec8c AA |
527 | struct pnfs_layout_hdr *lo; |
528 | LIST_HEAD(tmp_list); | |
529 | ||
c47abcf8 AA |
530 | nfs4_deviceid_mark_client_invalid(clp); |
531 | nfs4_deviceid_purge_client(clp); | |
532 | ||
974cec8c | 533 | spin_lock(&clp->cl_lock); |
6382a441 WAA |
534 | rcu_read_lock(); |
535 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
536 | if (!list_empty(&server->layouts)) | |
537 | list_splice_init(&server->layouts, &tmp_list); | |
538 | } | |
539 | rcu_read_unlock(); | |
974cec8c AA |
540 | spin_unlock(&clp->cl_lock); |
541 | ||
542 | while (!list_empty(&tmp_list)) { | |
543 | lo = list_entry(tmp_list.next, struct pnfs_layout_hdr, | |
b7edfaa1 | 544 | plh_layouts); |
974cec8c | 545 | dprintk("%s freeing layout for inode %lu\n", __func__, |
b7edfaa1 | 546 | lo->plh_inode->i_ino); |
2887fe45 | 547 | list_del_init(&lo->plh_layouts); |
b7edfaa1 | 548 | pnfs_destroy_layout(NFS_I(lo->plh_inode)); |
974cec8c | 549 | } |
e5e94017 BH |
550 | } |
551 | ||
5a65503f TM |
552 | /* |
553 | * Compare 2 layout stateid sequence ids, to see which is newer, | |
554 | * taking into account wraparound issues. | |
555 | */ | |
556 | static bool pnfs_seqid_is_newer(u32 s1, u32 s2) | |
557 | { | |
558 | return (s32)s1 - (s32)s2 > 0; | |
559 | } | |
560 | ||
fd6002e9 | 561 | /* update lo->plh_stateid with new if is more recent */ |
43f1b3da FI |
562 | void |
563 | pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, | |
564 | bool update_barrier) | |
b1f69b75 | 565 | { |
22aaf714 TM |
566 | u32 oldseq, newseq, new_barrier; |
567 | int empty = list_empty(&lo->plh_segs); | |
b1f69b75 | 568 | |
2d2f24ad TM |
569 | oldseq = be32_to_cpu(lo->plh_stateid.seqid); |
570 | newseq = be32_to_cpu(new->seqid); | |
22aaf714 | 571 | if (empty || pnfs_seqid_is_newer(newseq, oldseq)) { |
f597c537 | 572 | nfs4_stateid_copy(&lo->plh_stateid, new); |
43f1b3da | 573 | if (update_barrier) { |
22aaf714 | 574 | new_barrier = be32_to_cpu(new->seqid); |
43f1b3da FI |
575 | } else { |
576 | /* Because of wraparound, we want to keep the barrier | |
22aaf714 | 577 | * "close" to the current seqids. |
43f1b3da | 578 | */ |
22aaf714 | 579 | new_barrier = newseq - atomic_read(&lo->plh_outstanding); |
43f1b3da | 580 | } |
22aaf714 TM |
581 | if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) |
582 | lo->plh_barrier = new_barrier; | |
43f1b3da | 583 | } |
b1f69b75 AA |
584 | } |
585 | ||
cf7d63f1 | 586 | static bool |
19c54aba TM |
587 | pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, |
588 | const nfs4_stateid *stateid) | |
43f1b3da | 589 | { |
19c54aba | 590 | u32 seqid = be32_to_cpu(stateid->seqid); |
25a1a621 | 591 | |
19c54aba TM |
592 | return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); |
593 | } | |
594 | ||
595 | /* lget is set to 1 if called from inside send_layoutget call chain */ | |
596 | static bool | |
597 | pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo, int lget) | |
598 | { | |
f7e8917a FI |
599 | return lo->plh_block_lgets || |
600 | test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || | |
43f1b3da | 601 | (list_empty(&lo->plh_segs) && |
cf7d63f1 FI |
602 | (atomic_read(&lo->plh_outstanding) > lget)); |
603 | } | |
604 | ||
fd6002e9 FI |
605 | int |
606 | pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, | |
607 | struct nfs4_state *open_state) | |
b1f69b75 | 608 | { |
fd6002e9 | 609 | int status = 0; |
974cec8c | 610 | |
b1f69b75 | 611 | dprintk("--> %s\n", __func__); |
fd6002e9 | 612 | spin_lock(&lo->plh_inode->i_lock); |
19c54aba | 613 | if (pnfs_layoutgets_blocked(lo, 1)) { |
cf7d63f1 FI |
614 | status = -EAGAIN; |
615 | } else if (list_empty(&lo->plh_segs)) { | |
fd6002e9 FI |
616 | int seq; |
617 | ||
618 | do { | |
619 | seq = read_seqbegin(&open_state->seqlock); | |
f597c537 | 620 | nfs4_stateid_copy(dst, &open_state->stateid); |
fd6002e9 FI |
621 | } while (read_seqretry(&open_state->seqlock, seq)); |
622 | } else | |
f597c537 | 623 | nfs4_stateid_copy(dst, &lo->plh_stateid); |
fd6002e9 | 624 | spin_unlock(&lo->plh_inode->i_lock); |
b1f69b75 | 625 | dprintk("<-- %s\n", __func__); |
fd6002e9 | 626 | return status; |
b1f69b75 AA |
627 | } |
628 | ||
629 | /* | |
630 | * Get layout from server. | |
631 | * for now, assume that whole file layouts are requested. | |
632 | * arg->offset: 0 | |
633 | * arg->length: all ones | |
634 | */ | |
e5e94017 BH |
635 | static struct pnfs_layout_segment * |
636 | send_layoutget(struct pnfs_layout_hdr *lo, | |
637 | struct nfs_open_context *ctx, | |
fb3296eb | 638 | struct pnfs_layout_range *range, |
a75b9df9 | 639 | gfp_t gfp_flags) |
e5e94017 | 640 | { |
b7edfaa1 | 641 | struct inode *ino = lo->plh_inode; |
b1f69b75 AA |
642 | struct nfs_server *server = NFS_SERVER(ino); |
643 | struct nfs4_layoutget *lgp; | |
a0b0a6e3 | 644 | struct pnfs_layout_segment *lseg; |
b1f69b75 AA |
645 | |
646 | dprintk("--> %s\n", __func__); | |
e5e94017 | 647 | |
b1f69b75 | 648 | BUG_ON(ctx == NULL); |
a75b9df9 | 649 | lgp = kzalloc(sizeof(*lgp), gfp_flags); |
cf7d63f1 | 650 | if (lgp == NULL) |
b1f69b75 | 651 | return NULL; |
35124a09 | 652 | |
fb3296eb BH |
653 | lgp->args.minlength = PAGE_CACHE_SIZE; |
654 | if (lgp->args.minlength > range->length) | |
655 | lgp->args.minlength = range->length; | |
b1f69b75 | 656 | lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; |
fb3296eb | 657 | lgp->args.range = *range; |
b1f69b75 AA |
658 | lgp->args.type = server->pnfs_curr_ld->id; |
659 | lgp->args.inode = ino; | |
660 | lgp->args.ctx = get_nfs_open_context(ctx); | |
a75b9df9 | 661 | lgp->gfp_flags = gfp_flags; |
b1f69b75 AA |
662 | |
663 | /* Synchronously retrieve layout information from server and | |
664 | * store in lseg. | |
665 | */ | |
a0b0a6e3 TM |
666 | lseg = nfs4_proc_layoutget(lgp, gfp_flags); |
667 | if (IS_ERR(lseg)) { | |
668 | switch (PTR_ERR(lseg)) { | |
669 | case -ENOMEM: | |
670 | case -ERESTARTSYS: | |
671 | break; | |
672 | default: | |
673 | /* remember that LAYOUTGET failed and suspend trying */ | |
b9e028fd | 674 | pnfs_layout_io_set_failed(lo, range->iomode); |
a0b0a6e3 TM |
675 | } |
676 | return NULL; | |
974cec8c | 677 | } |
35124a09 | 678 | |
974cec8c AA |
679 | return lseg; |
680 | } | |
681 | ||
293b3b06 AA |
682 | /* |
683 | * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr | |
684 | * when the layout segment list is empty. | |
685 | * | |
686 | * Note that a pnfs_layout_hdr can exist with an empty layout segment | |
687 | * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the | |
688 | * deviceid is marked invalid. | |
689 | */ | |
cbe82603 BH |
690 | int |
691 | _pnfs_return_layout(struct inode *ino) | |
692 | { | |
693 | struct pnfs_layout_hdr *lo = NULL; | |
694 | struct nfs_inode *nfsi = NFS_I(ino); | |
695 | LIST_HEAD(tmp_list); | |
696 | struct nfs4_layoutreturn *lrp; | |
697 | nfs4_stateid stateid; | |
293b3b06 | 698 | int status = 0, empty; |
cbe82603 | 699 | |
366d5052 | 700 | dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); |
cbe82603 BH |
701 | |
702 | spin_lock(&ino->i_lock); | |
703 | lo = nfsi->layout; | |
e5929f3c | 704 | if (!lo) { |
cbe82603 | 705 | spin_unlock(&ino->i_lock); |
293b3b06 AA |
706 | dprintk("NFS: %s no layout to return\n", __func__); |
707 | goto out; | |
cbe82603 BH |
708 | } |
709 | stateid = nfsi->layout->plh_stateid; | |
710 | /* Reference matched in nfs4_layoutreturn_release */ | |
70c3bd2b | 711 | pnfs_get_layout_hdr(lo); |
293b3b06 | 712 | empty = list_empty(&lo->plh_segs); |
49a85061 | 713 | pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL); |
293b3b06 AA |
714 | /* Don't send a LAYOUTRETURN if list was initially empty */ |
715 | if (empty) { | |
716 | spin_unlock(&ino->i_lock); | |
70c3bd2b | 717 | pnfs_put_layout_hdr(lo); |
293b3b06 AA |
718 | dprintk("NFS: %s no layout segments to return\n", __func__); |
719 | goto out; | |
720 | } | |
ea0ded74 | 721 | lo->plh_block_lgets++; |
cbe82603 BH |
722 | spin_unlock(&ino->i_lock); |
723 | pnfs_free_lseg_list(&tmp_list); | |
724 | ||
725 | WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)); | |
726 | ||
727 | lrp = kzalloc(sizeof(*lrp), GFP_KERNEL); | |
728 | if (unlikely(lrp == NULL)) { | |
729 | status = -ENOMEM; | |
65857d57 TM |
730 | spin_lock(&ino->i_lock); |
731 | lo->plh_block_lgets--; | |
732 | spin_unlock(&ino->i_lock); | |
70c3bd2b | 733 | pnfs_put_layout_hdr(lo); |
cbe82603 BH |
734 | goto out; |
735 | } | |
736 | ||
737 | lrp->args.stateid = stateid; | |
738 | lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id; | |
739 | lrp->args.inode = ino; | |
a56aaa02 | 740 | lrp->args.layout = lo; |
cbe82603 BH |
741 | lrp->clp = NFS_SERVER(ino)->nfs_client; |
742 | ||
743 | status = nfs4_proc_layoutreturn(lrp); | |
744 | out: | |
745 | dprintk("<-- %s status: %d\n", __func__, status); | |
746 | return status; | |
747 | } | |
0a57cdac | 748 | EXPORT_SYMBOL_GPL(_pnfs_return_layout); |
cbe82603 | 749 | |
f7e8917a FI |
750 | bool pnfs_roc(struct inode *ino) |
751 | { | |
752 | struct pnfs_layout_hdr *lo; | |
753 | struct pnfs_layout_segment *lseg, *tmp; | |
754 | LIST_HEAD(tmp_list); | |
755 | bool found = false; | |
756 | ||
757 | spin_lock(&ino->i_lock); | |
758 | lo = NFS_I(ino)->layout; | |
759 | if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) || | |
760 | test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) | |
761 | goto out_nolayout; | |
762 | list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) | |
763 | if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { | |
764 | mark_lseg_invalid(lseg, &tmp_list); | |
765 | found = true; | |
766 | } | |
767 | if (!found) | |
768 | goto out_nolayout; | |
769 | lo->plh_block_lgets++; | |
70c3bd2b | 770 | pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */ |
f7e8917a FI |
771 | spin_unlock(&ino->i_lock); |
772 | pnfs_free_lseg_list(&tmp_list); | |
773 | return true; | |
774 | ||
775 | out_nolayout: | |
776 | spin_unlock(&ino->i_lock); | |
777 | return false; | |
778 | } | |
779 | ||
780 | void pnfs_roc_release(struct inode *ino) | |
781 | { | |
782 | struct pnfs_layout_hdr *lo; | |
783 | ||
784 | spin_lock(&ino->i_lock); | |
785 | lo = NFS_I(ino)->layout; | |
786 | lo->plh_block_lgets--; | |
6622c3ea TM |
787 | if (atomic_dec_and_test(&lo->plh_refcount)) { |
788 | pnfs_detach_layout_hdr(lo); | |
789 | spin_unlock(&ino->i_lock); | |
790 | pnfs_free_layout_hdr(lo); | |
791 | } else | |
792 | spin_unlock(&ino->i_lock); | |
f7e8917a FI |
793 | } |
794 | ||
795 | void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) | |
796 | { | |
797 | struct pnfs_layout_hdr *lo; | |
798 | ||
799 | spin_lock(&ino->i_lock); | |
800 | lo = NFS_I(ino)->layout; | |
0f35ad6f | 801 | if (pnfs_seqid_is_newer(barrier, lo->plh_barrier)) |
f7e8917a FI |
802 | lo->plh_barrier = barrier; |
803 | spin_unlock(&ino->i_lock); | |
804 | } | |
805 | ||
7fdab069 | 806 | bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task) |
f7e8917a FI |
807 | { |
808 | struct nfs_inode *nfsi = NFS_I(ino); | |
7fdab069 | 809 | struct pnfs_layout_hdr *lo; |
f7e8917a | 810 | struct pnfs_layout_segment *lseg; |
7fdab069 | 811 | u32 current_seqid; |
f7e8917a FI |
812 | bool found = false; |
813 | ||
814 | spin_lock(&ino->i_lock); | |
815 | list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list) | |
816 | if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { | |
7fdab069 | 817 | rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); |
f7e8917a | 818 | found = true; |
7fdab069 | 819 | goto out; |
f7e8917a | 820 | } |
7fdab069 TM |
821 | lo = nfsi->layout; |
822 | current_seqid = be32_to_cpu(lo->plh_stateid.seqid); | |
f7e8917a | 823 | |
7fdab069 TM |
824 | /* Since close does not return a layout stateid for use as |
825 | * a barrier, we choose the worst-case barrier. | |
826 | */ | |
827 | *barrier = current_seqid + atomic_read(&lo->plh_outstanding); | |
828 | out: | |
f7e8917a FI |
829 | spin_unlock(&ino->i_lock); |
830 | return found; | |
831 | } | |
832 | ||
b1f69b75 AA |
833 | /* |
834 | * Compare two layout segments for sorting into layout cache. | |
835 | * We want to preferentially return RW over RO layouts, so ensure those | |
836 | * are seen first. | |
837 | */ | |
838 | static s64 | |
fb3296eb BH |
839 | cmp_layout(struct pnfs_layout_range *l1, |
840 | struct pnfs_layout_range *l2) | |
b1f69b75 | 841 | { |
fb3296eb BH |
842 | s64 d; |
843 | ||
844 | /* high offset > low offset */ | |
845 | d = l1->offset - l2->offset; | |
846 | if (d) | |
847 | return d; | |
848 | ||
849 | /* short length > long length */ | |
850 | d = l2->length - l1->length; | |
851 | if (d) | |
852 | return d; | |
853 | ||
b1f69b75 | 854 | /* read > read/write */ |
fb3296eb | 855 | return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); |
b1f69b75 AA |
856 | } |
857 | ||
974cec8c | 858 | static void |
57036a37 | 859 | pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, |
974cec8c AA |
860 | struct pnfs_layout_segment *lseg) |
861 | { | |
b1f69b75 | 862 | struct pnfs_layout_segment *lp; |
b1f69b75 | 863 | |
974cec8c AA |
864 | dprintk("%s:Begin\n", __func__); |
865 | ||
b7edfaa1 | 866 | list_for_each_entry(lp, &lo->plh_segs, pls_list) { |
fb3296eb | 867 | if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0) |
b1f69b75 | 868 | continue; |
566052c5 | 869 | list_add_tail(&lseg->pls_list, &lp->pls_list); |
b1f69b75 AA |
870 | dprintk("%s: inserted lseg %p " |
871 | "iomode %d offset %llu length %llu before " | |
872 | "lp %p iomode %d offset %llu length %llu\n", | |
566052c5 FI |
873 | __func__, lseg, lseg->pls_range.iomode, |
874 | lseg->pls_range.offset, lseg->pls_range.length, | |
875 | lp, lp->pls_range.iomode, lp->pls_range.offset, | |
876 | lp->pls_range.length); | |
fb3296eb | 877 | goto out; |
974cec8c | 878 | } |
fb3296eb BH |
879 | list_add_tail(&lseg->pls_list, &lo->plh_segs); |
880 | dprintk("%s: inserted lseg %p " | |
881 | "iomode %d offset %llu length %llu at tail\n", | |
882 | __func__, lseg, lseg->pls_range.iomode, | |
883 | lseg->pls_range.offset, lseg->pls_range.length); | |
884 | out: | |
70c3bd2b | 885 | pnfs_get_layout_hdr(lo); |
974cec8c AA |
886 | |
887 | dprintk("%s:Return\n", __func__); | |
e5e94017 BH |
888 | } |
889 | ||
890 | static struct pnfs_layout_hdr * | |
9fa40758 PT |
891 | alloc_init_layout_hdr(struct inode *ino, |
892 | struct nfs_open_context *ctx, | |
893 | gfp_t gfp_flags) | |
e5e94017 BH |
894 | { |
895 | struct pnfs_layout_hdr *lo; | |
896 | ||
636fb9c8 | 897 | lo = pnfs_alloc_layout_hdr(ino, gfp_flags); |
e5e94017 BH |
898 | if (!lo) |
899 | return NULL; | |
cc6e5340 | 900 | atomic_set(&lo->plh_refcount, 1); |
b7edfaa1 FI |
901 | INIT_LIST_HEAD(&lo->plh_layouts); |
902 | INIT_LIST_HEAD(&lo->plh_segs); | |
43f1b3da | 903 | INIT_LIST_HEAD(&lo->plh_bulk_recall); |
b7edfaa1 | 904 | lo->plh_inode = ino; |
9fa40758 | 905 | lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred); |
e5e94017 BH |
906 | return lo; |
907 | } | |
908 | ||
909 | static struct pnfs_layout_hdr * | |
9fa40758 PT |
910 | pnfs_find_alloc_layout(struct inode *ino, |
911 | struct nfs_open_context *ctx, | |
912 | gfp_t gfp_flags) | |
e5e94017 BH |
913 | { |
914 | struct nfs_inode *nfsi = NFS_I(ino); | |
915 | struct pnfs_layout_hdr *new = NULL; | |
916 | ||
917 | dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); | |
918 | ||
251ec410 TM |
919 | if (nfsi->layout != NULL) |
920 | goto out_existing; | |
e5e94017 | 921 | spin_unlock(&ino->i_lock); |
9fa40758 | 922 | new = alloc_init_layout_hdr(ino, ctx, gfp_flags); |
e5e94017 BH |
923 | spin_lock(&ino->i_lock); |
924 | ||
251ec410 | 925 | if (likely(nfsi->layout == NULL)) { /* Won the race? */ |
e5e94017 | 926 | nfsi->layout = new; |
251ec410 TM |
927 | return new; |
928 | } | |
929 | pnfs_free_layout_hdr(new); | |
930 | out_existing: | |
931 | pnfs_get_layout_hdr(nfsi->layout); | |
e5e94017 BH |
932 | return nfsi->layout; |
933 | } | |
934 | ||
b1f69b75 AA |
935 | /* |
936 | * iomode matching rules: | |
937 | * iomode lseg match | |
938 | * ----- ----- ----- | |
939 | * ANY READ true | |
940 | * ANY RW true | |
941 | * RW READ false | |
942 | * RW RW true | |
943 | * READ READ true | |
944 | * READ RW true | |
945 | */ | |
946 | static int | |
fb3296eb BH |
947 | is_matching_lseg(struct pnfs_layout_range *ls_range, |
948 | struct pnfs_layout_range *range) | |
b1f69b75 | 949 | { |
fb3296eb BH |
950 | struct pnfs_layout_range range1; |
951 | ||
952 | if ((range->iomode == IOMODE_RW && | |
953 | ls_range->iomode != IOMODE_RW) || | |
954 | !lo_seg_intersecting(ls_range, range)) | |
955 | return 0; | |
956 | ||
957 | /* range1 covers only the first byte in the range */ | |
958 | range1 = *range; | |
959 | range1.length = 1; | |
960 | return lo_seg_contained(ls_range, &range1); | |
b1f69b75 AA |
961 | } |
962 | ||
963 | /* | |
964 | * lookup range in layout | |
965 | */ | |
e5e94017 | 966 | static struct pnfs_layout_segment * |
fb3296eb BH |
967 | pnfs_find_lseg(struct pnfs_layout_hdr *lo, |
968 | struct pnfs_layout_range *range) | |
e5e94017 | 969 | { |
b1f69b75 AA |
970 | struct pnfs_layout_segment *lseg, *ret = NULL; |
971 | ||
972 | dprintk("%s:Begin\n", __func__); | |
973 | ||
b7edfaa1 | 974 | list_for_each_entry(lseg, &lo->plh_segs, pls_list) { |
4541d16c | 975 | if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && |
fb3296eb | 976 | is_matching_lseg(&lseg->pls_range, range)) { |
9369a431 | 977 | ret = pnfs_get_lseg(lseg); |
b1f69b75 AA |
978 | break; |
979 | } | |
d771e3a4 | 980 | if (lseg->pls_range.offset > range->offset) |
b1f69b75 AA |
981 | break; |
982 | } | |
983 | ||
984 | dprintk("%s:Return lseg %p ref %d\n", | |
4541d16c | 985 | __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0); |
b1f69b75 | 986 | return ret; |
e5e94017 BH |
987 | } |
988 | ||
d23d61c8 AA |
989 | /* |
990 | * Use mdsthreshold hints set at each OPEN to determine if I/O should go | |
991 | * to the MDS or over pNFS | |
992 | * | |
993 | * The nfs_inode read_io and write_io fields are cumulative counters reset | |
994 | * when there are no layout segments. Note that in pnfs_update_layout iomode | |
995 | * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a | |
996 | * WRITE request. | |
997 | * | |
998 | * A return of true means use MDS I/O. | |
999 | * | |
1000 | * From rfc 5661: | |
1001 | * If a file's size is smaller than the file size threshold, data accesses | |
1002 | * SHOULD be sent to the metadata server. If an I/O request has a length that | |
1003 | * is below the I/O size threshold, the I/O SHOULD be sent to the metadata | |
1004 | * server. If both file size and I/O size are provided, the client SHOULD | |
1005 | * reach or exceed both thresholds before sending its read or write | |
1006 | * requests to the data server. | |
1007 | */ | |
1008 | static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, | |
1009 | struct inode *ino, int iomode) | |
1010 | { | |
1011 | struct nfs4_threshold *t = ctx->mdsthreshold; | |
1012 | struct nfs_inode *nfsi = NFS_I(ino); | |
1013 | loff_t fsize = i_size_read(ino); | |
1014 | bool size = false, size_set = false, io = false, io_set = false, ret = false; | |
1015 | ||
1016 | if (t == NULL) | |
1017 | return ret; | |
1018 | ||
1019 | dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", | |
1020 | __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); | |
1021 | ||
1022 | switch (iomode) { | |
1023 | case IOMODE_READ: | |
1024 | if (t->bm & THRESHOLD_RD) { | |
1025 | dprintk("%s fsize %llu\n", __func__, fsize); | |
1026 | size_set = true; | |
1027 | if (fsize < t->rd_sz) | |
1028 | size = true; | |
1029 | } | |
1030 | if (t->bm & THRESHOLD_RD_IO) { | |
1031 | dprintk("%s nfsi->read_io %llu\n", __func__, | |
1032 | nfsi->read_io); | |
1033 | io_set = true; | |
1034 | if (nfsi->read_io < t->rd_io_sz) | |
1035 | io = true; | |
1036 | } | |
1037 | break; | |
1038 | case IOMODE_RW: | |
1039 | if (t->bm & THRESHOLD_WR) { | |
1040 | dprintk("%s fsize %llu\n", __func__, fsize); | |
1041 | size_set = true; | |
1042 | if (fsize < t->wr_sz) | |
1043 | size = true; | |
1044 | } | |
1045 | if (t->bm & THRESHOLD_WR_IO) { | |
1046 | dprintk("%s nfsi->write_io %llu\n", __func__, | |
1047 | nfsi->write_io); | |
1048 | io_set = true; | |
1049 | if (nfsi->write_io < t->wr_io_sz) | |
1050 | io = true; | |
1051 | } | |
1052 | break; | |
1053 | } | |
1054 | if (size_set && io_set) { | |
1055 | if (size && io) | |
1056 | ret = true; | |
1057 | } else if (size || io) | |
1058 | ret = true; | |
1059 | ||
1060 | dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); | |
1061 | return ret; | |
1062 | } | |
1063 | ||
e5e94017 BH |
1064 | /* |
1065 | * Layout segment is retreived from the server if not cached. | |
1066 | * The appropriate layout segment is referenced and returned to the caller. | |
1067 | */ | |
7c24d948 | 1068 | struct pnfs_layout_segment * |
e5e94017 BH |
1069 | pnfs_update_layout(struct inode *ino, |
1070 | struct nfs_open_context *ctx, | |
fb3296eb BH |
1071 | loff_t pos, |
1072 | u64 count, | |
a75b9df9 TM |
1073 | enum pnfs_iomode iomode, |
1074 | gfp_t gfp_flags) | |
e5e94017 | 1075 | { |
fb3296eb BH |
1076 | struct pnfs_layout_range arg = { |
1077 | .iomode = iomode, | |
1078 | .offset = pos, | |
1079 | .length = count, | |
1080 | }; | |
707ed5fd | 1081 | unsigned pg_offset; |
6382a441 WAA |
1082 | struct nfs_server *server = NFS_SERVER(ino); |
1083 | struct nfs_client *clp = server->nfs_client; | |
e5e94017 BH |
1084 | struct pnfs_layout_hdr *lo; |
1085 | struct pnfs_layout_segment *lseg = NULL; | |
f49f9baa | 1086 | bool first = false; |
e5e94017 BH |
1087 | |
1088 | if (!pnfs_enabled_sb(NFS_SERVER(ino))) | |
f86bbcf8 | 1089 | goto out; |
d23d61c8 AA |
1090 | |
1091 | if (pnfs_within_mdsthreshold(ctx, ino, iomode)) | |
f86bbcf8 | 1092 | goto out; |
d23d61c8 | 1093 | |
e5e94017 | 1094 | spin_lock(&ino->i_lock); |
9fa40758 | 1095 | lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); |
830ffb56 TM |
1096 | if (lo == NULL) { |
1097 | spin_unlock(&ino->i_lock); | |
1098 | goto out; | |
1099 | } | |
e5e94017 | 1100 | |
43f1b3da | 1101 | /* Do we even need to bother with this? */ |
a59c30ac | 1102 | if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
43f1b3da | 1103 | dprintk("%s matches recall, use MDS\n", __func__); |
e5e94017 BH |
1104 | goto out_unlock; |
1105 | } | |
1106 | ||
1107 | /* if LAYOUTGET already failed once we don't try again */ | |
b9e028fd | 1108 | if (pnfs_layout_io_test_failed(lo, iomode)) |
e5e94017 BH |
1109 | goto out_unlock; |
1110 | ||
568e8c49 | 1111 | /* Check to see if the layout for the given range already exists */ |
fb3296eb | 1112 | lseg = pnfs_find_lseg(lo, &arg); |
568e8c49 AA |
1113 | if (lseg) |
1114 | goto out_unlock; | |
1115 | ||
19c54aba | 1116 | if (pnfs_layoutgets_blocked(lo, 0)) |
cf7d63f1 FI |
1117 | goto out_unlock; |
1118 | atomic_inc(&lo->plh_outstanding); | |
1119 | ||
f49f9baa FI |
1120 | if (list_empty(&lo->plh_segs)) |
1121 | first = true; | |
366d5052 | 1122 | |
f49f9baa FI |
1123 | spin_unlock(&ino->i_lock); |
1124 | if (first) { | |
2130ff66 FI |
1125 | /* The lo must be on the clp list if there is any |
1126 | * chance of a CB_LAYOUTRECALL(FILE) coming in. | |
1127 | */ | |
1128 | spin_lock(&clp->cl_lock); | |
1129 | BUG_ON(!list_empty(&lo->plh_layouts)); | |
6382a441 | 1130 | list_add_tail(&lo->plh_layouts, &server->layouts); |
2130ff66 FI |
1131 | spin_unlock(&clp->cl_lock); |
1132 | } | |
e5e94017 | 1133 | |
707ed5fd BH |
1134 | pg_offset = arg.offset & ~PAGE_CACHE_MASK; |
1135 | if (pg_offset) { | |
1136 | arg.offset -= pg_offset; | |
1137 | arg.length += pg_offset; | |
1138 | } | |
7c24d948 AA |
1139 | if (arg.length != NFS4_MAX_UINT64) |
1140 | arg.length = PAGE_CACHE_ALIGN(arg.length); | |
707ed5fd | 1141 | |
fb3296eb | 1142 | lseg = send_layoutget(lo, ctx, &arg, gfp_flags); |
cf7d63f1 | 1143 | atomic_dec(&lo->plh_outstanding); |
830ffb56 | 1144 | out_put_layout_hdr: |
70c3bd2b | 1145 | pnfs_put_layout_hdr(lo); |
e5e94017 | 1146 | out: |
f86bbcf8 TM |
1147 | dprintk("%s: inode %s/%llu pNFS layout segment %s for " |
1148 | "(%s, offset: %llu, length: %llu)\n", | |
1149 | __func__, ino->i_sb->s_id, | |
1150 | (unsigned long long)NFS_FILEID(ino), | |
1151 | lseg == NULL ? "not found" : "found", | |
1152 | iomode==IOMODE_RW ? "read/write" : "read-only", | |
1153 | (unsigned long long)pos, | |
1154 | (unsigned long long)count); | |
e5e94017 BH |
1155 | return lseg; |
1156 | out_unlock: | |
1157 | spin_unlock(&ino->i_lock); | |
830ffb56 | 1158 | goto out_put_layout_hdr; |
e5e94017 | 1159 | } |
7c24d948 | 1160 | EXPORT_SYMBOL_GPL(pnfs_update_layout); |
b1f69b75 | 1161 | |
a0b0a6e3 | 1162 | struct pnfs_layout_segment * |
b1f69b75 AA |
1163 | pnfs_layout_process(struct nfs4_layoutget *lgp) |
1164 | { | |
1165 | struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; | |
1166 | struct nfs4_layoutget_res *res = &lgp->res; | |
1167 | struct pnfs_layout_segment *lseg; | |
b7edfaa1 | 1168 | struct inode *ino = lo->plh_inode; |
b1f69b75 AA |
1169 | int status = 0; |
1170 | ||
1171 | /* Inject layout blob into I/O device driver */ | |
a75b9df9 | 1172 | lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); |
b1f69b75 AA |
1173 | if (!lseg || IS_ERR(lseg)) { |
1174 | if (!lseg) | |
1175 | status = -ENOMEM; | |
1176 | else | |
1177 | status = PTR_ERR(lseg); | |
1178 | dprintk("%s: Could not allocate layout: error %d\n", | |
1179 | __func__, status); | |
1180 | goto out; | |
1181 | } | |
1182 | ||
1183 | spin_lock(&ino->i_lock); | |
a59c30ac | 1184 | if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
43f1b3da FI |
1185 | dprintk("%s forget reply due to recall\n", __func__); |
1186 | goto out_forget_reply; | |
1187 | } | |
1188 | ||
19c54aba TM |
1189 | if (pnfs_layoutgets_blocked(lo, 1) || |
1190 | pnfs_layout_stateid_blocked(lo, &res->stateid)) { | |
43f1b3da FI |
1191 | dprintk("%s forget reply due to state\n", __func__); |
1192 | goto out_forget_reply; | |
1193 | } | |
038d6493 TM |
1194 | |
1195 | /* Done processing layoutget. Set the layout stateid */ | |
1196 | pnfs_set_layout_stateid(lo, &res->stateid, false); | |
1197 | ||
b1f69b75 | 1198 | init_lseg(lo, lseg); |
566052c5 | 1199 | lseg->pls_range = res->range; |
9369a431 | 1200 | pnfs_get_lseg(lseg); |
57036a37 | 1201 | pnfs_layout_insert_lseg(lo, lseg); |
b1f69b75 | 1202 | |
f7e8917a FI |
1203 | if (res->return_on_close) { |
1204 | set_bit(NFS_LSEG_ROC, &lseg->pls_flags); | |
1205 | set_bit(NFS_LAYOUT_ROC, &lo->plh_flags); | |
1206 | } | |
1207 | ||
b1f69b75 | 1208 | spin_unlock(&ino->i_lock); |
a0b0a6e3 | 1209 | return lseg; |
b1f69b75 | 1210 | out: |
a0b0a6e3 | 1211 | return ERR_PTR(status); |
43f1b3da FI |
1212 | |
1213 | out_forget_reply: | |
1214 | spin_unlock(&ino->i_lock); | |
1215 | lseg->pls_layout = lo; | |
1216 | NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); | |
1217 | goto out; | |
b1f69b75 AA |
1218 | } |
1219 | ||
d8007d4d TM |
1220 | void |
1221 | pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) | |
1222 | { | |
1fd937bd PT |
1223 | u64 rd_size = req->wb_bytes; |
1224 | ||
d8007d4d TM |
1225 | BUG_ON(pgio->pg_lseg != NULL); |
1226 | ||
1825a0d0 FI |
1227 | if (req->wb_offset != req->wb_pgbase) { |
1228 | nfs_pageio_reset_read_mds(pgio); | |
1229 | return; | |
1230 | } | |
1fd937bd PT |
1231 | |
1232 | if (pgio->pg_dreq == NULL) | |
1233 | rd_size = i_size_read(pgio->pg_inode) - req_offset(req); | |
1234 | else | |
1235 | rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); | |
1236 | ||
d8007d4d TM |
1237 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
1238 | req->wb_context, | |
1239 | req_offset(req), | |
1fd937bd | 1240 | rd_size, |
d8007d4d TM |
1241 | IOMODE_READ, |
1242 | GFP_KERNEL); | |
e885de1a TM |
1243 | /* If no lseg, fall back to read through mds */ |
1244 | if (pgio->pg_lseg == NULL) | |
1f945357 | 1245 | nfs_pageio_reset_read_mds(pgio); |
e885de1a | 1246 | |
d8007d4d TM |
1247 | } |
1248 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); | |
1249 | ||
1250 | void | |
6296556f PT |
1251 | pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, |
1252 | struct nfs_page *req, u64 wb_size) | |
d8007d4d TM |
1253 | { |
1254 | BUG_ON(pgio->pg_lseg != NULL); | |
1255 | ||
1825a0d0 FI |
1256 | if (req->wb_offset != req->wb_pgbase) { |
1257 | nfs_pageio_reset_write_mds(pgio); | |
1258 | return; | |
1259 | } | |
6296556f | 1260 | |
d8007d4d TM |
1261 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
1262 | req->wb_context, | |
1263 | req_offset(req), | |
6296556f | 1264 | wb_size, |
d8007d4d TM |
1265 | IOMODE_RW, |
1266 | GFP_NOFS); | |
e885de1a TM |
1267 | /* If no lseg, fall back to write through mds */ |
1268 | if (pgio->pg_lseg == NULL) | |
1f945357 | 1269 | nfs_pageio_reset_write_mds(pgio); |
d8007d4d TM |
1270 | } |
1271 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); | |
1272 | ||
1abb5088 | 1273 | void |
061ae2ed FI |
1274 | pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode, |
1275 | const struct nfs_pgio_completion_ops *compl_ops) | |
1751c363 TM |
1276 | { |
1277 | struct nfs_server *server = NFS_SERVER(inode); | |
1278 | struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; | |
1279 | ||
1280 | if (ld == NULL) | |
1abb5088 BS |
1281 | nfs_pageio_init_read(pgio, inode, compl_ops); |
1282 | else | |
1283 | nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0); | |
1751c363 TM |
1284 | } |
1285 | ||
57208fa7 | 1286 | void |
061ae2ed FI |
1287 | pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, |
1288 | int ioflags, | |
1289 | const struct nfs_pgio_completion_ops *compl_ops) | |
1751c363 TM |
1290 | { |
1291 | struct nfs_server *server = NFS_SERVER(inode); | |
1292 | struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; | |
1293 | ||
1294 | if (ld == NULL) | |
57208fa7 BS |
1295 | nfs_pageio_init_write(pgio, inode, ioflags, compl_ops); |
1296 | else | |
1297 | nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags); | |
1751c363 TM |
1298 | } |
1299 | ||
18ad0a9f | 1300 | bool |
dfed206b BH |
1301 | pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
1302 | struct nfs_page *req) | |
94ad1c80 | 1303 | { |
d8007d4d TM |
1304 | if (pgio->pg_lseg == NULL) |
1305 | return nfs_generic_pg_test(pgio, prev, req); | |
94ad1c80 | 1306 | |
19982ba8 TM |
1307 | /* |
1308 | * Test if a nfs_page is fully contained in the pnfs_layout_range. | |
1309 | * Note that this test makes several assumptions: | |
1310 | * - that the previous nfs_page in the struct nfs_pageio_descriptor | |
1311 | * is known to lie within the range. | |
1312 | * - that the nfs_page being tested is known to be contiguous with the | |
1313 | * previous nfs_page. | |
1314 | * - Layout ranges are page aligned, so we only have to test the | |
1315 | * start offset of the request. | |
1316 | * | |
1317 | * Please also note that 'end_offset' is actually the offset of the | |
1318 | * first byte that lies outside the pnfs_layout_range. FIXME? | |
1319 | * | |
1320 | */ | |
1321 | return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset, | |
1322 | pgio->pg_lseg->pls_range.length); | |
94ad1c80 | 1323 | } |
89a58e32 | 1324 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); |
94ad1c80 | 1325 | |
e7dd79af | 1326 | int pnfs_write_done_resend_to_mds(struct inode *inode, |
061ae2ed FI |
1327 | struct list_head *head, |
1328 | const struct nfs_pgio_completion_ops *compl_ops) | |
e2fecb21 TM |
1329 | { |
1330 | struct nfs_pageio_descriptor pgio; | |
1331 | LIST_HEAD(failed); | |
1332 | ||
1333 | /* Resend all requests through the MDS */ | |
57208fa7 | 1334 | nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops); |
e2fecb21 TM |
1335 | while (!list_empty(head)) { |
1336 | struct nfs_page *req = nfs_list_entry(head->next); | |
1337 | ||
1338 | nfs_list_remove_request(req); | |
1339 | if (!nfs_pageio_add_request(&pgio, req)) | |
1340 | nfs_list_add_request(req, &failed); | |
1341 | } | |
1342 | nfs_pageio_complete(&pgio); | |
1343 | ||
1344 | if (!list_empty(&failed)) { | |
1345 | /* For some reason our attempt to resend pages. Mark the | |
1346 | * overall send request as having failed, and let | |
1347 | * nfs_writeback_release_full deal with the error. | |
1348 | */ | |
1349 | list_move(&failed, head); | |
1350 | return -EIO; | |
1351 | } | |
1352 | return 0; | |
1353 | } | |
e7dd79af | 1354 | EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); |
e2fecb21 | 1355 | |
1acbbb4e FI |
1356 | static void pnfs_ld_handle_write_error(struct nfs_write_data *data) |
1357 | { | |
cd841605 FI |
1358 | struct nfs_pgio_header *hdr = data->header; |
1359 | ||
1360 | dprintk("pnfs write error = %d\n", hdr->pnfs_error); | |
1361 | if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & | |
1acbbb4e | 1362 | PNFS_LAYOUTRET_ON_ERROR) { |
cd841605 FI |
1363 | clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags); |
1364 | pnfs_return_layout(hdr->inode); | |
1acbbb4e | 1365 | } |
6c75dc0d FI |
1366 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
1367 | data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode, | |
061ae2ed FI |
1368 | &hdr->pages, |
1369 | hdr->completion_ops); | |
1acbbb4e FI |
1370 | } |
1371 | ||
d20581aa BH |
1372 | /* |
1373 | * Called by non rpc-based layout drivers | |
1374 | */ | |
8ce160c5 | 1375 | void pnfs_ld_write_done(struct nfs_write_data *data) |
44b83799 | 1376 | { |
cd841605 FI |
1377 | struct nfs_pgio_header *hdr = data->header; |
1378 | ||
1379 | if (!hdr->pnfs_error) { | |
d20581aa | 1380 | pnfs_set_layoutcommit(data); |
cd841605 | 1381 | hdr->mds_ops->rpc_call_done(&data->task, data); |
1acbbb4e FI |
1382 | } else |
1383 | pnfs_ld_handle_write_error(data); | |
cd841605 | 1384 | hdr->mds_ops->rpc_release(data); |
44b83799 | 1385 | } |
d20581aa | 1386 | EXPORT_SYMBOL_GPL(pnfs_ld_write_done); |
44b83799 | 1387 | |
dce81290 TM |
1388 | static void |
1389 | pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, | |
1390 | struct nfs_write_data *data) | |
1391 | { | |
cd841605 FI |
1392 | struct nfs_pgio_header *hdr = data->header; |
1393 | ||
6c75dc0d FI |
1394 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
1395 | list_splice_tail_init(&hdr->pages, &desc->pg_list); | |
1396 | nfs_pageio_reset_write_mds(desc); | |
1397 | desc->pg_recoalesce = 1; | |
1398 | } | |
dce81290 TM |
1399 | nfs_writedata_release(data); |
1400 | } | |
1401 | ||
1402 | static enum pnfs_try_status | |
0382b744 | 1403 | pnfs_try_to_write_data(struct nfs_write_data *wdata, |
dce81290 TM |
1404 | const struct rpc_call_ops *call_ops, |
1405 | struct pnfs_layout_segment *lseg, | |
1406 | int how) | |
0382b744 | 1407 | { |
cd841605 FI |
1408 | struct nfs_pgio_header *hdr = wdata->header; |
1409 | struct inode *inode = hdr->inode; | |
0382b744 AA |
1410 | enum pnfs_try_status trypnfs; |
1411 | struct nfs_server *nfss = NFS_SERVER(inode); | |
1412 | ||
cd841605 | 1413 | hdr->mds_ops = call_ops; |
0382b744 AA |
1414 | |
1415 | dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, | |
1416 | inode->i_ino, wdata->args.count, wdata->args.offset, how); | |
0382b744 | 1417 | trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how); |
6c75dc0d | 1418 | if (trypnfs != PNFS_NOT_ATTEMPTED) |
0382b744 | 1419 | nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); |
0382b744 AA |
1420 | dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
1421 | return trypnfs; | |
1422 | } | |
1423 | ||
dce81290 TM |
1424 | static void |
1425 | pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how) | |
1426 | { | |
1427 | struct nfs_write_data *data; | |
1428 | const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; | |
1429 | struct pnfs_layout_segment *lseg = desc->pg_lseg; | |
1430 | ||
1431 | desc->pg_lseg = NULL; | |
1432 | while (!list_empty(head)) { | |
1433 | enum pnfs_try_status trypnfs; | |
1434 | ||
6c75dc0d | 1435 | data = list_first_entry(head, struct nfs_write_data, list); |
dce81290 TM |
1436 | list_del_init(&data->list); |
1437 | ||
1438 | trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how); | |
1439 | if (trypnfs == PNFS_NOT_ATTEMPTED) | |
1440 | pnfs_write_through_mds(desc, data); | |
1441 | } | |
9369a431 | 1442 | pnfs_put_lseg(lseg); |
dce81290 TM |
1443 | } |
1444 | ||
6c75dc0d FI |
1445 | static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) |
1446 | { | |
9369a431 | 1447 | pnfs_put_lseg(hdr->lseg); |
6c75dc0d FI |
1448 | nfs_writehdr_free(hdr); |
1449 | } | |
89d77c8f | 1450 | EXPORT_SYMBOL_GPL(pnfs_writehdr_free); |
6c75dc0d | 1451 | |
dce81290 TM |
1452 | int |
1453 | pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) | |
1454 | { | |
6c75dc0d FI |
1455 | struct nfs_write_header *whdr; |
1456 | struct nfs_pgio_header *hdr; | |
dce81290 TM |
1457 | int ret; |
1458 | ||
6c75dc0d FI |
1459 | whdr = nfs_writehdr_alloc(); |
1460 | if (!whdr) { | |
9b5415b5 | 1461 | desc->pg_completion_ops->error_cleanup(&desc->pg_list); |
9369a431 | 1462 | pnfs_put_lseg(desc->pg_lseg); |
dce81290 | 1463 | desc->pg_lseg = NULL; |
6c75dc0d | 1464 | return -ENOMEM; |
dce81290 | 1465 | } |
6c75dc0d FI |
1466 | hdr = &whdr->header; |
1467 | nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); | |
9369a431 | 1468 | hdr->lseg = pnfs_get_lseg(desc->pg_lseg); |
6c75dc0d FI |
1469 | atomic_inc(&hdr->refcnt); |
1470 | ret = nfs_generic_flush(desc, hdr); | |
1471 | if (ret != 0) { | |
9369a431 | 1472 | pnfs_put_lseg(desc->pg_lseg); |
6c75dc0d | 1473 | desc->pg_lseg = NULL; |
6c75dc0d FI |
1474 | } else |
1475 | pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags); | |
1476 | if (atomic_dec_and_test(&hdr->refcnt)) | |
061ae2ed | 1477 | hdr->completion_ops->completion(hdr); |
6c75dc0d | 1478 | return ret; |
dce81290 TM |
1479 | } |
1480 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); | |
1481 | ||
e7dd79af | 1482 | int pnfs_read_done_resend_to_mds(struct inode *inode, |
061ae2ed FI |
1483 | struct list_head *head, |
1484 | const struct nfs_pgio_completion_ops *compl_ops) | |
62e4a769 TM |
1485 | { |
1486 | struct nfs_pageio_descriptor pgio; | |
1acbbb4e | 1487 | LIST_HEAD(failed); |
62e4a769 | 1488 | |
1acbbb4e | 1489 | /* Resend all requests through the MDS */ |
1abb5088 | 1490 | nfs_pageio_init_read(&pgio, inode, compl_ops); |
1acbbb4e FI |
1491 | while (!list_empty(head)) { |
1492 | struct nfs_page *req = nfs_list_entry(head->next); | |
62e4a769 TM |
1493 | |
1494 | nfs_list_remove_request(req); | |
1acbbb4e FI |
1495 | if (!nfs_pageio_add_request(&pgio, req)) |
1496 | nfs_list_add_request(req, &failed); | |
62e4a769 TM |
1497 | } |
1498 | nfs_pageio_complete(&pgio); | |
1acbbb4e FI |
1499 | |
1500 | if (!list_empty(&failed)) { | |
1501 | list_move(&failed, head); | |
1502 | return -EIO; | |
1503 | } | |
1504 | return 0; | |
1505 | } | |
e7dd79af | 1506 | EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); |
1acbbb4e FI |
1507 | |
1508 | static void pnfs_ld_handle_read_error(struct nfs_read_data *data) | |
1509 | { | |
cd841605 FI |
1510 | struct nfs_pgio_header *hdr = data->header; |
1511 | ||
1512 | dprintk("pnfs read error = %d\n", hdr->pnfs_error); | |
1513 | if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & | |
1acbbb4e | 1514 | PNFS_LAYOUTRET_ON_ERROR) { |
cd841605 FI |
1515 | clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags); |
1516 | pnfs_return_layout(hdr->inode); | |
1acbbb4e | 1517 | } |
4db6e0b7 FI |
1518 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
1519 | data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode, | |
061ae2ed FI |
1520 | &hdr->pages, |
1521 | hdr->completion_ops); | |
62e4a769 TM |
1522 | } |
1523 | ||
d20581aa BH |
1524 | /* |
1525 | * Called by non rpc-based layout drivers | |
1526 | */ | |
9b7eecdc | 1527 | void pnfs_ld_read_done(struct nfs_read_data *data) |
d20581aa | 1528 | { |
cd841605 FI |
1529 | struct nfs_pgio_header *hdr = data->header; |
1530 | ||
1531 | if (likely(!hdr->pnfs_error)) { | |
d20581aa | 1532 | __nfs4_read_done_cb(data); |
cd841605 | 1533 | hdr->mds_ops->rpc_call_done(&data->task, data); |
62e4a769 TM |
1534 | } else |
1535 | pnfs_ld_handle_read_error(data); | |
cd841605 | 1536 | hdr->mds_ops->rpc_release(data); |
d20581aa BH |
1537 | } |
1538 | EXPORT_SYMBOL_GPL(pnfs_ld_read_done); | |
1539 | ||
493292dd TM |
1540 | static void |
1541 | pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, | |
1542 | struct nfs_read_data *data) | |
1543 | { | |
cd841605 FI |
1544 | struct nfs_pgio_header *hdr = data->header; |
1545 | ||
4db6e0b7 FI |
1546 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
1547 | list_splice_tail_init(&hdr->pages, &desc->pg_list); | |
1548 | nfs_pageio_reset_read_mds(desc); | |
1549 | desc->pg_recoalesce = 1; | |
1550 | } | |
493292dd TM |
1551 | nfs_readdata_release(data); |
1552 | } | |
1553 | ||
64419a9b AA |
1554 | /* |
1555 | * Call the appropriate parallel I/O subsystem read function. | |
1556 | */ | |
493292dd | 1557 | static enum pnfs_try_status |
64419a9b | 1558 | pnfs_try_to_read_data(struct nfs_read_data *rdata, |
493292dd TM |
1559 | const struct rpc_call_ops *call_ops, |
1560 | struct pnfs_layout_segment *lseg) | |
64419a9b | 1561 | { |
cd841605 FI |
1562 | struct nfs_pgio_header *hdr = rdata->header; |
1563 | struct inode *inode = hdr->inode; | |
64419a9b AA |
1564 | struct nfs_server *nfss = NFS_SERVER(inode); |
1565 | enum pnfs_try_status trypnfs; | |
1566 | ||
cd841605 | 1567 | hdr->mds_ops = call_ops; |
64419a9b AA |
1568 | |
1569 | dprintk("%s: Reading ino:%lu %u@%llu\n", | |
1570 | __func__, inode->i_ino, rdata->args.count, rdata->args.offset); | |
1571 | ||
1572 | trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata); | |
4db6e0b7 | 1573 | if (trypnfs != PNFS_NOT_ATTEMPTED) |
64419a9b | 1574 | nfs_inc_stats(inode, NFSIOS_PNFS_READ); |
64419a9b AA |
1575 | dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
1576 | return trypnfs; | |
1577 | } | |
863a3c6c | 1578 | |
493292dd TM |
1579 | static void |
1580 | pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head) | |
1581 | { | |
1582 | struct nfs_read_data *data; | |
1583 | const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; | |
1584 | struct pnfs_layout_segment *lseg = desc->pg_lseg; | |
1585 | ||
1586 | desc->pg_lseg = NULL; | |
1587 | while (!list_empty(head)) { | |
1588 | enum pnfs_try_status trypnfs; | |
1589 | ||
4db6e0b7 | 1590 | data = list_first_entry(head, struct nfs_read_data, list); |
493292dd TM |
1591 | list_del_init(&data->list); |
1592 | ||
1593 | trypnfs = pnfs_try_to_read_data(data, call_ops, lseg); | |
1594 | if (trypnfs == PNFS_NOT_ATTEMPTED) | |
1595 | pnfs_read_through_mds(desc, data); | |
1596 | } | |
9369a431 | 1597 | pnfs_put_lseg(lseg); |
493292dd TM |
1598 | } |
1599 | ||
4db6e0b7 FI |
1600 | static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) |
1601 | { | |
9369a431 | 1602 | pnfs_put_lseg(hdr->lseg); |
4db6e0b7 FI |
1603 | nfs_readhdr_free(hdr); |
1604 | } | |
89d77c8f | 1605 | EXPORT_SYMBOL_GPL(pnfs_readhdr_free); |
4db6e0b7 | 1606 | |
493292dd TM |
1607 | int |
1608 | pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) | |
1609 | { | |
4db6e0b7 FI |
1610 | struct nfs_read_header *rhdr; |
1611 | struct nfs_pgio_header *hdr; | |
493292dd TM |
1612 | int ret; |
1613 | ||
4db6e0b7 FI |
1614 | rhdr = nfs_readhdr_alloc(); |
1615 | if (!rhdr) { | |
061ae2ed | 1616 | desc->pg_completion_ops->error_cleanup(&desc->pg_list); |
4db6e0b7 | 1617 | ret = -ENOMEM; |
9369a431 | 1618 | pnfs_put_lseg(desc->pg_lseg); |
493292dd TM |
1619 | desc->pg_lseg = NULL; |
1620 | return ret; | |
1621 | } | |
4db6e0b7 FI |
1622 | hdr = &rhdr->header; |
1623 | nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); | |
9369a431 | 1624 | hdr->lseg = pnfs_get_lseg(desc->pg_lseg); |
4db6e0b7 FI |
1625 | atomic_inc(&hdr->refcnt); |
1626 | ret = nfs_generic_pagein(desc, hdr); | |
1627 | if (ret != 0) { | |
9369a431 | 1628 | pnfs_put_lseg(desc->pg_lseg); |
4db6e0b7 | 1629 | desc->pg_lseg = NULL; |
4db6e0b7 FI |
1630 | } else |
1631 | pnfs_do_multiple_reads(desc, &hdr->rpc_list); | |
1632 | if (atomic_dec_and_test(&hdr->refcnt)) | |
061ae2ed | 1633 | hdr->completion_ops->completion(hdr); |
4db6e0b7 | 1634 | return ret; |
493292dd TM |
1635 | } |
1636 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); | |
1637 | ||
863a3c6c | 1638 | /* |
a9bae566 | 1639 | * There can be multiple RW segments. |
863a3c6c | 1640 | */ |
a9bae566 | 1641 | static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) |
863a3c6c | 1642 | { |
a9bae566 | 1643 | struct pnfs_layout_segment *lseg; |
863a3c6c | 1644 | |
a9bae566 PT |
1645 | list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { |
1646 | if (lseg->pls_range.iomode == IOMODE_RW && | |
1647 | test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) | |
1648 | list_add(&lseg->pls_lc_list, listp); | |
1649 | } | |
863a3c6c AA |
1650 | } |
1651 | ||
1b0ae068 PT |
1652 | void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) |
1653 | { | |
b9e028fd | 1654 | pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); |
1b0ae068 PT |
1655 | } |
1656 | EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); | |
1657 | ||
863a3c6c AA |
1658 | void |
1659 | pnfs_set_layoutcommit(struct nfs_write_data *wdata) | |
1660 | { | |
cd841605 FI |
1661 | struct nfs_pgio_header *hdr = wdata->header; |
1662 | struct inode *inode = hdr->inode; | |
1663 | struct nfs_inode *nfsi = NFS_I(inode); | |
4b8ee2b8 | 1664 | loff_t end_pos = wdata->mds_offset + wdata->res.count; |
79a48a1f | 1665 | bool mark_as_dirty = false; |
863a3c6c | 1666 | |
cd841605 | 1667 | spin_lock(&inode->i_lock); |
863a3c6c | 1668 | if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { |
79a48a1f | 1669 | mark_as_dirty = true; |
863a3c6c | 1670 | dprintk("%s: Set layoutcommit for inode %lu ", |
cd841605 | 1671 | __func__, inode->i_ino); |
863a3c6c | 1672 | } |
cd841605 | 1673 | if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) { |
a9bae566 | 1674 | /* references matched in nfs4_layoutcommit_release */ |
9369a431 | 1675 | pnfs_get_lseg(hdr->lseg); |
a9bae566 | 1676 | } |
acff5880 PT |
1677 | if (end_pos > nfsi->layout->plh_lwb) |
1678 | nfsi->layout->plh_lwb = end_pos; | |
cd841605 | 1679 | spin_unlock(&inode->i_lock); |
acff5880 | 1680 | dprintk("%s: lseg %p end_pos %llu\n", |
cd841605 | 1681 | __func__, hdr->lseg, nfsi->layout->plh_lwb); |
79a48a1f WAA |
1682 | |
1683 | /* if pnfs_layoutcommit_inode() runs between inode locks, the next one | |
1684 | * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ | |
1685 | if (mark_as_dirty) | |
cd841605 | 1686 | mark_inode_dirty_sync(inode); |
863a3c6c AA |
1687 | } |
1688 | EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); | |
1689 | ||
db29c089 AA |
1690 | void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) |
1691 | { | |
1692 | struct nfs_server *nfss = NFS_SERVER(data->args.inode); | |
1693 | ||
1694 | if (nfss->pnfs_curr_ld->cleanup_layoutcommit) | |
1695 | nfss->pnfs_curr_ld->cleanup_layoutcommit(data); | |
1696 | } | |
1697 | ||
de4b15c7 AA |
1698 | /* |
1699 | * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and | |
1700 | * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough | |
1701 | * data to disk to allow the server to recover the data if it crashes. | |
1702 | * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag | |
1703 | * is off, and a COMMIT is sent to a data server, or | |
1704 | * if WRITEs to a data server return NFS_DATA_SYNC. | |
1705 | */ | |
863a3c6c | 1706 | int |
ef311537 | 1707 | pnfs_layoutcommit_inode(struct inode *inode, bool sync) |
863a3c6c AA |
1708 | { |
1709 | struct nfs4_layoutcommit_data *data; | |
1710 | struct nfs_inode *nfsi = NFS_I(inode); | |
863a3c6c AA |
1711 | loff_t end_pos; |
1712 | int status = 0; | |
1713 | ||
1714 | dprintk("--> %s inode %lu\n", __func__, inode->i_ino); | |
1715 | ||
de4b15c7 AA |
1716 | if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
1717 | return 0; | |
1718 | ||
863a3c6c AA |
1719 | /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ |
1720 | data = kzalloc(sizeof(*data), GFP_NOFS); | |
de4b15c7 | 1721 | if (!data) { |
de4b15c7 AA |
1722 | status = -ENOMEM; |
1723 | goto out; | |
1724 | } | |
863a3c6c | 1725 | |
92407e75 PT |
1726 | if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
1727 | goto out_free; | |
1728 | ||
1729 | if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { | |
1730 | if (!sync) { | |
1731 | status = -EAGAIN; | |
1732 | goto out_free; | |
1733 | } | |
1734 | status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING, | |
1735 | nfs_wait_bit_killable, TASK_KILLABLE); | |
1736 | if (status) | |
1737 | goto out_free; | |
1738 | } | |
1739 | ||
a9bae566 | 1740 | INIT_LIST_HEAD(&data->lseg_list); |
de4b15c7 | 1741 | spin_lock(&inode->i_lock); |
863a3c6c | 1742 | if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { |
92407e75 | 1743 | clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags); |
863a3c6c | 1744 | spin_unlock(&inode->i_lock); |
92407e75 PT |
1745 | wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING); |
1746 | goto out_free; | |
863a3c6c | 1747 | } |
a9bae566 PT |
1748 | |
1749 | pnfs_list_write_lseg(inode, &data->lseg_list); | |
863a3c6c | 1750 | |
acff5880 | 1751 | end_pos = nfsi->layout->plh_lwb; |
acff5880 | 1752 | nfsi->layout->plh_lwb = 0; |
863a3c6c | 1753 | |
f597c537 | 1754 | nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); |
863a3c6c AA |
1755 | spin_unlock(&inode->i_lock); |
1756 | ||
1757 | data->args.inode = inode; | |
9fa40758 | 1758 | data->cred = get_rpccred(nfsi->layout->plh_lc_cred); |
863a3c6c AA |
1759 | nfs_fattr_init(&data->fattr); |
1760 | data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; | |
1761 | data->res.fattr = &data->fattr; | |
1762 | data->args.lastbytewritten = end_pos - 1; | |
1763 | data->res.server = NFS_SERVER(inode); | |
1764 | ||
1765 | status = nfs4_proc_layoutcommit(data, sync); | |
1766 | out: | |
92407e75 PT |
1767 | if (status) |
1768 | mark_inode_dirty_sync(inode); | |
863a3c6c AA |
1769 | dprintk("<-- %s status %d\n", __func__, status); |
1770 | return status; | |
92407e75 PT |
1771 | out_free: |
1772 | kfree(data); | |
1773 | goto out; | |
863a3c6c | 1774 | } |
82be417a AA |
1775 | |
1776 | struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) | |
1777 | { | |
1778 | struct nfs4_threshold *thp; | |
1779 | ||
1780 | thp = kzalloc(sizeof(*thp), GFP_NOFS); | |
1781 | if (!thp) { | |
1782 | dprintk("%s mdsthreshold allocation failed\n", __func__); | |
1783 | return NULL; | |
1784 | } | |
1785 | return thp; | |
1786 | } |