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 | |
38 | ||
02c35fca FI |
39 | /* Locking: |
40 | * | |
41 | * pnfs_spinlock: | |
42 | * protects pnfs_modules_tbl. | |
43 | */ | |
44 | static DEFINE_SPINLOCK(pnfs_spinlock); | |
45 | ||
46 | /* | |
47 | * pnfs_modules_tbl holds all pnfs modules | |
48 | */ | |
49 | static LIST_HEAD(pnfs_modules_tbl); | |
50 | ||
51 | /* Return the registered pnfs layout driver module matching given id */ | |
52 | static struct pnfs_layoutdriver_type * | |
53 | find_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; | |
61 | out: | |
62 | dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); | |
63 | return local; | |
64 | } | |
65 | ||
85e174ba RL |
66 | static struct pnfs_layoutdriver_type * |
67 | find_pnfs_driver(u32 id) | |
68 | { | |
02c35fca FI |
69 | struct pnfs_layoutdriver_type *local; |
70 | ||
71 | spin_lock(&pnfs_spinlock); | |
72 | local = find_pnfs_driver_locked(id); | |
0a9c63fa TM |
73 | if (local != NULL && !try_module_get(local->owner)) { |
74 | dprintk("%s: Could not grab reference on module\n", __func__); | |
75 | local = NULL; | |
76 | } | |
02c35fca FI |
77 | spin_unlock(&pnfs_spinlock); |
78 | return local; | |
85e174ba RL |
79 | } |
80 | ||
81 | void | |
82 | unset_pnfs_layoutdriver(struct nfs_server *nfss) | |
83 | { | |
738fd0f3 BH |
84 | if (nfss->pnfs_curr_ld) { |
85 | if (nfss->pnfs_curr_ld->clear_layoutdriver) | |
86 | nfss->pnfs_curr_ld->clear_layoutdriver(nfss); | |
2a4c8994 TM |
87 | /* Decrement the MDS count. Purge the deviceid cache if zero */ |
88 | if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) | |
89 | nfs4_deviceid_purge_client(nfss->nfs_client); | |
02c35fca | 90 | module_put(nfss->pnfs_curr_ld->owner); |
738fd0f3 | 91 | } |
85e174ba RL |
92 | nfss->pnfs_curr_ld = NULL; |
93 | } | |
94 | ||
95 | /* | |
96 | * Try to set the server's pnfs module to the pnfs layout type specified by id. | |
97 | * Currently only one pNFS layout driver per filesystem is supported. | |
98 | * | |
99 | * @id layout type. Zero (illegal layout type) indicates pNFS not in use. | |
100 | */ | |
101 | void | |
738fd0f3 BH |
102 | set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, |
103 | u32 id) | |
85e174ba RL |
104 | { |
105 | struct pnfs_layoutdriver_type *ld_type = NULL; | |
106 | ||
107 | if (id == 0) | |
108 | goto out_no_driver; | |
109 | if (!(server->nfs_client->cl_exchange_flags & | |
110 | (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { | |
a030889a WAA |
111 | printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n", |
112 | __func__, id, server->nfs_client->cl_exchange_flags); | |
85e174ba RL |
113 | goto out_no_driver; |
114 | } | |
115 | ld_type = find_pnfs_driver(id); | |
116 | if (!ld_type) { | |
117 | request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); | |
118 | ld_type = find_pnfs_driver(id); | |
119 | if (!ld_type) { | |
120 | dprintk("%s: No pNFS module found for %u.\n", | |
121 | __func__, id); | |
122 | goto out_no_driver; | |
123 | } | |
124 | } | |
125 | server->pnfs_curr_ld = ld_type; | |
738fd0f3 BH |
126 | if (ld_type->set_layoutdriver |
127 | && ld_type->set_layoutdriver(server, mntfh)) { | |
a030889a WAA |
128 | printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " |
129 | "driver %u.\n", __func__, id); | |
738fd0f3 BH |
130 | module_put(ld_type->owner); |
131 | goto out_no_driver; | |
132 | } | |
2a4c8994 TM |
133 | /* Bump the MDS count */ |
134 | atomic_inc(&server->nfs_client->cl_mds_count); | |
ea8eecdd | 135 | |
85e174ba RL |
136 | dprintk("%s: pNFS module for %u set\n", __func__, id); |
137 | return; | |
138 | ||
139 | out_no_driver: | |
140 | dprintk("%s: Using NFSv4 I/O\n", __func__); | |
141 | server->pnfs_curr_ld = NULL; | |
142 | } | |
02c35fca FI |
143 | |
144 | int | |
145 | pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) | |
146 | { | |
147 | int status = -EINVAL; | |
148 | struct pnfs_layoutdriver_type *tmp; | |
149 | ||
150 | if (ld_type->id == 0) { | |
a030889a | 151 | printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); |
02c35fca FI |
152 | return status; |
153 | } | |
b1f69b75 | 154 | if (!ld_type->alloc_lseg || !ld_type->free_lseg) { |
a030889a | 155 | printk(KERN_ERR "NFS: %s Layout driver must provide " |
b1f69b75 AA |
156 | "alloc_lseg and free_lseg.\n", __func__); |
157 | return status; | |
158 | } | |
02c35fca FI |
159 | |
160 | spin_lock(&pnfs_spinlock); | |
161 | tmp = find_pnfs_driver_locked(ld_type->id); | |
162 | if (!tmp) { | |
163 | list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); | |
164 | status = 0; | |
165 | dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, | |
166 | ld_type->name); | |
167 | } else { | |
a030889a | 168 | printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", |
02c35fca FI |
169 | __func__, ld_type->id); |
170 | } | |
171 | spin_unlock(&pnfs_spinlock); | |
172 | ||
173 | return status; | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); | |
176 | ||
177 | void | |
178 | pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) | |
179 | { | |
180 | dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); | |
181 | spin_lock(&pnfs_spinlock); | |
182 | list_del(&ld_type->pnfs_tblid); | |
183 | spin_unlock(&pnfs_spinlock); | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); | |
e5e94017 | 186 | |
b1f69b75 AA |
187 | /* |
188 | * pNFS client layout cache | |
189 | */ | |
190 | ||
cc6e5340 | 191 | /* Need to hold i_lock if caller does not already hold reference */ |
43f1b3da | 192 | void |
cc6e5340 | 193 | get_layout_hdr(struct pnfs_layout_hdr *lo) |
e5e94017 | 194 | { |
cc6e5340 | 195 | atomic_inc(&lo->plh_refcount); |
e5e94017 BH |
196 | } |
197 | ||
636fb9c8 BH |
198 | static struct pnfs_layout_hdr * |
199 | pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) | |
200 | { | |
201 | struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; | |
202 | return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) : | |
203 | kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags); | |
204 | } | |
205 | ||
206 | static void | |
207 | pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
208 | { | |
209 | struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld; | |
9fa40758 | 210 | put_rpccred(lo->plh_lc_cred); |
636fb9c8 BH |
211 | return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo); |
212 | } | |
213 | ||
e5e94017 | 214 | static void |
cc6e5340 | 215 | destroy_layout_hdr(struct pnfs_layout_hdr *lo) |
e5e94017 | 216 | { |
cc6e5340 FI |
217 | dprintk("%s: freeing layout cache %p\n", __func__, lo); |
218 | BUG_ON(!list_empty(&lo->plh_layouts)); | |
219 | NFS_I(lo->plh_inode)->layout = NULL; | |
636fb9c8 | 220 | pnfs_free_layout_hdr(lo); |
cc6e5340 | 221 | } |
e5e94017 | 222 | |
cc6e5340 FI |
223 | static void |
224 | put_layout_hdr_locked(struct pnfs_layout_hdr *lo) | |
225 | { | |
226 | if (atomic_dec_and_test(&lo->plh_refcount)) | |
227 | destroy_layout_hdr(lo); | |
e5e94017 BH |
228 | } |
229 | ||
b1f69b75 | 230 | void |
cc6e5340 | 231 | put_layout_hdr(struct pnfs_layout_hdr *lo) |
974cec8c | 232 | { |
cc6e5340 FI |
233 | struct inode *inode = lo->plh_inode; |
234 | ||
235 | if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { | |
236 | destroy_layout_hdr(lo); | |
237 | spin_unlock(&inode->i_lock); | |
238 | } | |
974cec8c AA |
239 | } |
240 | ||
241 | static void | |
242 | init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) | |
243 | { | |
566052c5 | 244 | INIT_LIST_HEAD(&lseg->pls_list); |
a9bae566 | 245 | INIT_LIST_HEAD(&lseg->pls_lc_list); |
4541d16c FI |
246 | atomic_set(&lseg->pls_refcount, 1); |
247 | smp_mb(); | |
248 | set_bit(NFS_LSEG_VALID, &lseg->pls_flags); | |
566052c5 | 249 | lseg->pls_layout = lo; |
974cec8c AA |
250 | } |
251 | ||
4541d16c | 252 | static void free_lseg(struct pnfs_layout_segment *lseg) |
974cec8c | 253 | { |
b7edfaa1 | 254 | struct inode *ino = lseg->pls_layout->plh_inode; |
974cec8c | 255 | |
b1f69b75 | 256 | NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); |
52fabd73 | 257 | /* Matched by get_layout_hdr in pnfs_insert_layout */ |
cc6e5340 | 258 | put_layout_hdr(NFS_I(ino)->layout); |
974cec8c AA |
259 | } |
260 | ||
d684d2ae FI |
261 | static void |
262 | put_lseg_common(struct pnfs_layout_segment *lseg) | |
263 | { | |
264 | struct inode *inode = lseg->pls_layout->plh_inode; | |
265 | ||
d20581aa | 266 | WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
d684d2ae FI |
267 | list_del_init(&lseg->pls_list); |
268 | if (list_empty(&lseg->pls_layout->plh_segs)) { | |
269 | set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags); | |
270 | /* Matched by initial refcount set in alloc_init_layout_hdr */ | |
271 | put_layout_hdr_locked(lseg->pls_layout); | |
272 | } | |
273 | rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); | |
274 | } | |
275 | ||
bae724ef | 276 | void |
d684d2ae | 277 | put_lseg(struct pnfs_layout_segment *lseg) |
974cec8c | 278 | { |
d684d2ae FI |
279 | struct inode *inode; |
280 | ||
281 | if (!lseg) | |
282 | return; | |
283 | ||
4541d16c FI |
284 | dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, |
285 | atomic_read(&lseg->pls_refcount), | |
286 | test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); | |
d684d2ae FI |
287 | inode = lseg->pls_layout->plh_inode; |
288 | if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { | |
289 | LIST_HEAD(free_me); | |
4541d16c | 290 | |
d684d2ae FI |
291 | put_lseg_common(lseg); |
292 | list_add(&lseg->pls_list, &free_me); | |
293 | spin_unlock(&inode->i_lock); | |
294 | pnfs_free_lseg_list(&free_me); | |
4541d16c | 295 | } |
4541d16c | 296 | } |
e0c2b380 | 297 | EXPORT_SYMBOL_GPL(put_lseg); |
974cec8c | 298 | |
fb3296eb BH |
299 | static inline u64 |
300 | end_offset(u64 start, u64 len) | |
301 | { | |
302 | u64 end; | |
303 | ||
304 | end = start + len; | |
305 | return end >= start ? end : NFS4_MAX_UINT64; | |
306 | } | |
307 | ||
308 | /* last octet in a range */ | |
309 | static inline u64 | |
310 | last_byte_offset(u64 start, u64 len) | |
311 | { | |
312 | u64 end; | |
313 | ||
314 | BUG_ON(!len); | |
315 | end = start + len; | |
316 | return end > start ? end - 1 : NFS4_MAX_UINT64; | |
317 | } | |
318 | ||
319 | /* | |
320 | * is l2 fully contained in l1? | |
321 | * start1 end1 | |
322 | * [----------------------------------) | |
323 | * start2 end2 | |
324 | * [----------------) | |
325 | */ | |
326 | static inline int | |
327 | lo_seg_contained(struct pnfs_layout_range *l1, | |
328 | struct pnfs_layout_range *l2) | |
329 | { | |
330 | u64 start1 = l1->offset; | |
331 | u64 end1 = end_offset(start1, l1->length); | |
332 | u64 start2 = l2->offset; | |
333 | u64 end2 = end_offset(start2, l2->length); | |
334 | ||
335 | return (start1 <= start2) && (end1 >= end2); | |
336 | } | |
337 | ||
338 | /* | |
339 | * is l1 and l2 intersecting? | |
340 | * start1 end1 | |
341 | * [----------------------------------) | |
342 | * start2 end2 | |
343 | * [----------------) | |
344 | */ | |
345 | static inline int | |
346 | lo_seg_intersecting(struct pnfs_layout_range *l1, | |
347 | struct pnfs_layout_range *l2) | |
348 | { | |
349 | u64 start1 = l1->offset; | |
350 | u64 end1 = end_offset(start1, l1->length); | |
351 | u64 start2 = l2->offset; | |
352 | u64 end2 = end_offset(start2, l2->length); | |
353 | ||
354 | return (end1 == NFS4_MAX_UINT64 || end1 > start2) && | |
355 | (end2 == NFS4_MAX_UINT64 || end2 > start1); | |
356 | } | |
357 | ||
4541d16c | 358 | static bool |
778b5502 BH |
359 | should_free_lseg(struct pnfs_layout_range *lseg_range, |
360 | struct pnfs_layout_range *recall_range) | |
4541d16c | 361 | { |
778b5502 BH |
362 | return (recall_range->iomode == IOMODE_ANY || |
363 | lseg_range->iomode == recall_range->iomode) && | |
364 | lo_seg_intersecting(lseg_range, recall_range); | |
974cec8c AA |
365 | } |
366 | ||
4541d16c FI |
367 | /* Returns 1 if lseg is removed from list, 0 otherwise */ |
368 | static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, | |
369 | struct list_head *tmp_list) | |
370 | { | |
371 | int rv = 0; | |
372 | ||
373 | if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { | |
374 | /* Remove the reference keeping the lseg in the | |
375 | * list. It will now be removed when all | |
376 | * outstanding io is finished. | |
377 | */ | |
d684d2ae FI |
378 | dprintk("%s: lseg %p ref %d\n", __func__, lseg, |
379 | atomic_read(&lseg->pls_refcount)); | |
380 | if (atomic_dec_and_test(&lseg->pls_refcount)) { | |
381 | put_lseg_common(lseg); | |
382 | list_add(&lseg->pls_list, tmp_list); | |
383 | rv = 1; | |
384 | } | |
4541d16c FI |
385 | } |
386 | return rv; | |
387 | } | |
388 | ||
389 | /* Returns count of number of matching invalid lsegs remaining in list | |
390 | * after call. | |
391 | */ | |
43f1b3da | 392 | int |
4541d16c FI |
393 | mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
394 | struct list_head *tmp_list, | |
778b5502 | 395 | struct pnfs_layout_range *recall_range) |
974cec8c AA |
396 | { |
397 | struct pnfs_layout_segment *lseg, *next; | |
4541d16c | 398 | int invalid = 0, removed = 0; |
974cec8c AA |
399 | |
400 | dprintk("%s:Begin lo %p\n", __func__, lo); | |
401 | ||
38511722 | 402 | if (list_empty(&lo->plh_segs)) { |
2701d086 AA |
403 | /* Reset MDS Threshold I/O counters */ |
404 | NFS_I(lo->plh_inode)->write_io = 0; | |
405 | NFS_I(lo->plh_inode)->read_io = 0; | |
38511722 FI |
406 | if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) |
407 | put_layout_hdr_locked(lo); | |
408 | return 0; | |
409 | } | |
4541d16c | 410 | list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
778b5502 BH |
411 | if (!recall_range || |
412 | should_free_lseg(&lseg->pls_range, recall_range)) { | |
4541d16c FI |
413 | dprintk("%s: freeing lseg %p iomode %d " |
414 | "offset %llu length %llu\n", __func__, | |
415 | lseg, lseg->pls_range.iomode, lseg->pls_range.offset, | |
416 | lseg->pls_range.length); | |
417 | invalid++; | |
418 | removed += mark_lseg_invalid(lseg, tmp_list); | |
419 | } | |
420 | dprintk("%s:Return %i\n", __func__, invalid - removed); | |
421 | return invalid - removed; | |
974cec8c AA |
422 | } |
423 | ||
f49f9baa | 424 | /* note free_me must contain lsegs from a single layout_hdr */ |
43f1b3da | 425 | void |
4541d16c | 426 | pnfs_free_lseg_list(struct list_head *free_me) |
974cec8c | 427 | { |
4541d16c | 428 | struct pnfs_layout_segment *lseg, *tmp; |
f49f9baa FI |
429 | struct pnfs_layout_hdr *lo; |
430 | ||
431 | if (list_empty(free_me)) | |
432 | return; | |
433 | ||
434 | lo = list_first_entry(free_me, struct pnfs_layout_segment, | |
435 | pls_list)->pls_layout; | |
974cec8c | 436 | |
f49f9baa FI |
437 | if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) { |
438 | struct nfs_client *clp; | |
439 | ||
440 | clp = NFS_SERVER(lo->plh_inode)->nfs_client; | |
441 | spin_lock(&clp->cl_lock); | |
442 | list_del_init(&lo->plh_layouts); | |
443 | spin_unlock(&clp->cl_lock); | |
444 | } | |
4541d16c | 445 | list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { |
566052c5 | 446 | list_del(&lseg->pls_list); |
4541d16c | 447 | free_lseg(lseg); |
974cec8c AA |
448 | } |
449 | } | |
450 | ||
e5e94017 BH |
451 | void |
452 | pnfs_destroy_layout(struct nfs_inode *nfsi) | |
453 | { | |
454 | struct pnfs_layout_hdr *lo; | |
974cec8c | 455 | LIST_HEAD(tmp_list); |
e5e94017 BH |
456 | |
457 | spin_lock(&nfsi->vfs_inode.i_lock); | |
458 | lo = nfsi->layout; | |
459 | if (lo) { | |
38511722 | 460 | lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ |
778b5502 | 461 | mark_matching_lsegs_invalid(lo, &tmp_list, NULL); |
e5e94017 BH |
462 | } |
463 | spin_unlock(&nfsi->vfs_inode.i_lock); | |
974cec8c AA |
464 | pnfs_free_lseg_list(&tmp_list); |
465 | } | |
041245c8 | 466 | EXPORT_SYMBOL_GPL(pnfs_destroy_layout); |
974cec8c AA |
467 | |
468 | /* | |
469 | * Called by the state manger to remove all layouts established under an | |
470 | * expired lease. | |
471 | */ | |
472 | void | |
473 | pnfs_destroy_all_layouts(struct nfs_client *clp) | |
474 | { | |
6382a441 | 475 | struct nfs_server *server; |
974cec8c AA |
476 | struct pnfs_layout_hdr *lo; |
477 | LIST_HEAD(tmp_list); | |
478 | ||
c47abcf8 AA |
479 | nfs4_deviceid_mark_client_invalid(clp); |
480 | nfs4_deviceid_purge_client(clp); | |
481 | ||
974cec8c | 482 | spin_lock(&clp->cl_lock); |
6382a441 WAA |
483 | rcu_read_lock(); |
484 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
485 | if (!list_empty(&server->layouts)) | |
486 | list_splice_init(&server->layouts, &tmp_list); | |
487 | } | |
488 | rcu_read_unlock(); | |
974cec8c AA |
489 | spin_unlock(&clp->cl_lock); |
490 | ||
491 | while (!list_empty(&tmp_list)) { | |
492 | lo = list_entry(tmp_list.next, struct pnfs_layout_hdr, | |
b7edfaa1 | 493 | plh_layouts); |
974cec8c | 494 | dprintk("%s freeing layout for inode %lu\n", __func__, |
b7edfaa1 | 495 | lo->plh_inode->i_ino); |
2887fe45 | 496 | list_del_init(&lo->plh_layouts); |
b7edfaa1 | 497 | pnfs_destroy_layout(NFS_I(lo->plh_inode)); |
974cec8c | 498 | } |
e5e94017 BH |
499 | } |
500 | ||
fd6002e9 | 501 | /* update lo->plh_stateid with new if is more recent */ |
43f1b3da FI |
502 | void |
503 | pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, | |
504 | bool update_barrier) | |
b1f69b75 | 505 | { |
fd6002e9 | 506 | u32 oldseq, newseq; |
b1f69b75 | 507 | |
2d2f24ad TM |
508 | oldseq = be32_to_cpu(lo->plh_stateid.seqid); |
509 | newseq = be32_to_cpu(new->seqid); | |
43f1b3da | 510 | if ((int)(newseq - oldseq) > 0) { |
f597c537 | 511 | nfs4_stateid_copy(&lo->plh_stateid, new); |
43f1b3da | 512 | if (update_barrier) { |
2d2f24ad | 513 | u32 new_barrier = be32_to_cpu(new->seqid); |
43f1b3da FI |
514 | |
515 | if ((int)(new_barrier - lo->plh_barrier)) | |
516 | lo->plh_barrier = new_barrier; | |
517 | } else { | |
518 | /* Because of wraparound, we want to keep the barrier | |
519 | * "close" to the current seqids. It needs to be | |
520 | * within 2**31 to count as "behind", so if it | |
521 | * gets too near that limit, give us a litle leeway | |
522 | * and bring it to within 2**30. | |
523 | * NOTE - and yes, this is all unsigned arithmetic. | |
524 | */ | |
525 | if (unlikely((newseq - lo->plh_barrier) > (3 << 29))) | |
526 | lo->plh_barrier = newseq - (1 << 30); | |
527 | } | |
528 | } | |
b1f69b75 AA |
529 | } |
530 | ||
cf7d63f1 FI |
531 | /* lget is set to 1 if called from inside send_layoutget call chain */ |
532 | static bool | |
43f1b3da FI |
533 | pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid, |
534 | int lget) | |
535 | { | |
536 | if ((stateid) && | |
2d2f24ad | 537 | (int)(lo->plh_barrier - be32_to_cpu(stateid->seqid)) >= 0) |
43f1b3da | 538 | return true; |
f7e8917a | 539 | return lo->plh_block_lgets || |
38511722 | 540 | test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) || |
f7e8917a | 541 | test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || |
43f1b3da | 542 | (list_empty(&lo->plh_segs) && |
cf7d63f1 FI |
543 | (atomic_read(&lo->plh_outstanding) > lget)); |
544 | } | |
545 | ||
fd6002e9 FI |
546 | int |
547 | pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, | |
548 | struct nfs4_state *open_state) | |
b1f69b75 | 549 | { |
fd6002e9 | 550 | int status = 0; |
974cec8c | 551 | |
b1f69b75 | 552 | dprintk("--> %s\n", __func__); |
fd6002e9 | 553 | spin_lock(&lo->plh_inode->i_lock); |
43f1b3da | 554 | if (pnfs_layoutgets_blocked(lo, NULL, 1)) { |
cf7d63f1 FI |
555 | status = -EAGAIN; |
556 | } else if (list_empty(&lo->plh_segs)) { | |
fd6002e9 FI |
557 | int seq; |
558 | ||
559 | do { | |
560 | seq = read_seqbegin(&open_state->seqlock); | |
f597c537 | 561 | nfs4_stateid_copy(dst, &open_state->stateid); |
fd6002e9 FI |
562 | } while (read_seqretry(&open_state->seqlock, seq)); |
563 | } else | |
f597c537 | 564 | nfs4_stateid_copy(dst, &lo->plh_stateid); |
fd6002e9 | 565 | spin_unlock(&lo->plh_inode->i_lock); |
b1f69b75 | 566 | dprintk("<-- %s\n", __func__); |
fd6002e9 | 567 | return status; |
b1f69b75 AA |
568 | } |
569 | ||
570 | /* | |
571 | * Get layout from server. | |
572 | * for now, assume that whole file layouts are requested. | |
573 | * arg->offset: 0 | |
574 | * arg->length: all ones | |
575 | */ | |
e5e94017 BH |
576 | static struct pnfs_layout_segment * |
577 | send_layoutget(struct pnfs_layout_hdr *lo, | |
578 | struct nfs_open_context *ctx, | |
fb3296eb | 579 | struct pnfs_layout_range *range, |
a75b9df9 | 580 | gfp_t gfp_flags) |
e5e94017 | 581 | { |
b7edfaa1 | 582 | struct inode *ino = lo->plh_inode; |
b1f69b75 AA |
583 | struct nfs_server *server = NFS_SERVER(ino); |
584 | struct nfs4_layoutget *lgp; | |
585 | struct pnfs_layout_segment *lseg = NULL; | |
586 | ||
587 | dprintk("--> %s\n", __func__); | |
e5e94017 | 588 | |
b1f69b75 | 589 | BUG_ON(ctx == NULL); |
a75b9df9 | 590 | lgp = kzalloc(sizeof(*lgp), gfp_flags); |
cf7d63f1 | 591 | if (lgp == NULL) |
b1f69b75 | 592 | return NULL; |
35124a09 | 593 | |
fb3296eb BH |
594 | lgp->args.minlength = PAGE_CACHE_SIZE; |
595 | if (lgp->args.minlength > range->length) | |
596 | lgp->args.minlength = range->length; | |
b1f69b75 | 597 | lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; |
fb3296eb | 598 | lgp->args.range = *range; |
b1f69b75 AA |
599 | lgp->args.type = server->pnfs_curr_ld->id; |
600 | lgp->args.inode = ino; | |
601 | lgp->args.ctx = get_nfs_open_context(ctx); | |
602 | lgp->lsegpp = &lseg; | |
a75b9df9 | 603 | lgp->gfp_flags = gfp_flags; |
b1f69b75 AA |
604 | |
605 | /* Synchronously retrieve layout information from server and | |
606 | * store in lseg. | |
607 | */ | |
8554116e | 608 | nfs4_proc_layoutget(lgp, gfp_flags); |
974cec8c | 609 | if (!lseg) { |
b1f69b75 | 610 | /* remember that LAYOUTGET failed and suspend trying */ |
fb3296eb | 611 | set_bit(lo_fail_bit(range->iomode), &lo->plh_flags); |
974cec8c | 612 | } |
35124a09 | 613 | |
974cec8c AA |
614 | return lseg; |
615 | } | |
616 | ||
293b3b06 AA |
617 | /* |
618 | * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr | |
619 | * when the layout segment list is empty. | |
620 | * | |
621 | * Note that a pnfs_layout_hdr can exist with an empty layout segment | |
622 | * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the | |
623 | * deviceid is marked invalid. | |
624 | */ | |
cbe82603 BH |
625 | int |
626 | _pnfs_return_layout(struct inode *ino) | |
627 | { | |
628 | struct pnfs_layout_hdr *lo = NULL; | |
629 | struct nfs_inode *nfsi = NFS_I(ino); | |
630 | LIST_HEAD(tmp_list); | |
631 | struct nfs4_layoutreturn *lrp; | |
632 | nfs4_stateid stateid; | |
293b3b06 | 633 | int status = 0, empty; |
cbe82603 | 634 | |
366d5052 | 635 | dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); |
cbe82603 BH |
636 | |
637 | spin_lock(&ino->i_lock); | |
638 | lo = nfsi->layout; | |
366d5052 | 639 | if (!lo || pnfs_test_layout_returned(lo)) { |
cbe82603 | 640 | spin_unlock(&ino->i_lock); |
293b3b06 AA |
641 | dprintk("NFS: %s no layout to return\n", __func__); |
642 | goto out; | |
cbe82603 BH |
643 | } |
644 | stateid = nfsi->layout->plh_stateid; | |
645 | /* Reference matched in nfs4_layoutreturn_release */ | |
646 | get_layout_hdr(lo); | |
293b3b06 | 647 | empty = list_empty(&lo->plh_segs); |
ea0ded74 | 648 | mark_matching_lsegs_invalid(lo, &tmp_list, NULL); |
293b3b06 AA |
649 | /* Don't send a LAYOUTRETURN if list was initially empty */ |
650 | if (empty) { | |
651 | spin_unlock(&ino->i_lock); | |
652 | put_layout_hdr(lo); | |
653 | dprintk("NFS: %s no layout segments to return\n", __func__); | |
654 | goto out; | |
655 | } | |
ea0ded74 | 656 | lo->plh_block_lgets++; |
366d5052 | 657 | pnfs_mark_layout_returned(lo); |
cbe82603 BH |
658 | spin_unlock(&ino->i_lock); |
659 | pnfs_free_lseg_list(&tmp_list); | |
660 | ||
661 | WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)); | |
662 | ||
663 | lrp = kzalloc(sizeof(*lrp), GFP_KERNEL); | |
664 | if (unlikely(lrp == NULL)) { | |
665 | status = -ENOMEM; | |
9e2dfdb3 FI |
666 | set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags); |
667 | set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags); | |
366d5052 | 668 | pnfs_clear_layout_returned(lo); |
1ed3a853 | 669 | put_layout_hdr(lo); |
cbe82603 BH |
670 | goto out; |
671 | } | |
672 | ||
673 | lrp->args.stateid = stateid; | |
674 | lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id; | |
675 | lrp->args.inode = ino; | |
a56aaa02 | 676 | lrp->args.layout = lo; |
cbe82603 BH |
677 | lrp->clp = NFS_SERVER(ino)->nfs_client; |
678 | ||
679 | status = nfs4_proc_layoutreturn(lrp); | |
680 | out: | |
681 | dprintk("<-- %s status: %d\n", __func__, status); | |
682 | return status; | |
683 | } | |
0a57cdac | 684 | EXPORT_SYMBOL_GPL(_pnfs_return_layout); |
cbe82603 | 685 | |
f7e8917a FI |
686 | bool pnfs_roc(struct inode *ino) |
687 | { | |
688 | struct pnfs_layout_hdr *lo; | |
689 | struct pnfs_layout_segment *lseg, *tmp; | |
690 | LIST_HEAD(tmp_list); | |
691 | bool found = false; | |
692 | ||
693 | spin_lock(&ino->i_lock); | |
694 | lo = NFS_I(ino)->layout; | |
695 | if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) || | |
696 | test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) | |
697 | goto out_nolayout; | |
698 | list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) | |
699 | if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { | |
700 | mark_lseg_invalid(lseg, &tmp_list); | |
701 | found = true; | |
702 | } | |
703 | if (!found) | |
704 | goto out_nolayout; | |
705 | lo->plh_block_lgets++; | |
706 | get_layout_hdr(lo); /* matched in pnfs_roc_release */ | |
707 | spin_unlock(&ino->i_lock); | |
708 | pnfs_free_lseg_list(&tmp_list); | |
709 | return true; | |
710 | ||
711 | out_nolayout: | |
712 | spin_unlock(&ino->i_lock); | |
713 | return false; | |
714 | } | |
715 | ||
716 | void pnfs_roc_release(struct inode *ino) | |
717 | { | |
718 | struct pnfs_layout_hdr *lo; | |
719 | ||
720 | spin_lock(&ino->i_lock); | |
721 | lo = NFS_I(ino)->layout; | |
722 | lo->plh_block_lgets--; | |
723 | put_layout_hdr_locked(lo); | |
724 | spin_unlock(&ino->i_lock); | |
725 | } | |
726 | ||
727 | void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) | |
728 | { | |
729 | struct pnfs_layout_hdr *lo; | |
730 | ||
731 | spin_lock(&ino->i_lock); | |
732 | lo = NFS_I(ino)->layout; | |
733 | if ((int)(barrier - lo->plh_barrier) > 0) | |
734 | lo->plh_barrier = barrier; | |
735 | spin_unlock(&ino->i_lock); | |
736 | } | |
737 | ||
738 | bool pnfs_roc_drain(struct inode *ino, u32 *barrier) | |
739 | { | |
740 | struct nfs_inode *nfsi = NFS_I(ino); | |
741 | struct pnfs_layout_segment *lseg; | |
742 | bool found = false; | |
743 | ||
744 | spin_lock(&ino->i_lock); | |
745 | list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list) | |
746 | if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { | |
747 | found = true; | |
748 | break; | |
749 | } | |
750 | if (!found) { | |
751 | struct pnfs_layout_hdr *lo = nfsi->layout; | |
2d2f24ad | 752 | u32 current_seqid = be32_to_cpu(lo->plh_stateid.seqid); |
f7e8917a FI |
753 | |
754 | /* Since close does not return a layout stateid for use as | |
755 | * a barrier, we choose the worst-case barrier. | |
756 | */ | |
757 | *barrier = current_seqid + atomic_read(&lo->plh_outstanding); | |
758 | } | |
759 | spin_unlock(&ino->i_lock); | |
760 | return found; | |
761 | } | |
762 | ||
b1f69b75 AA |
763 | /* |
764 | * Compare two layout segments for sorting into layout cache. | |
765 | * We want to preferentially return RW over RO layouts, so ensure those | |
766 | * are seen first. | |
767 | */ | |
768 | static s64 | |
fb3296eb BH |
769 | cmp_layout(struct pnfs_layout_range *l1, |
770 | struct pnfs_layout_range *l2) | |
b1f69b75 | 771 | { |
fb3296eb BH |
772 | s64 d; |
773 | ||
774 | /* high offset > low offset */ | |
775 | d = l1->offset - l2->offset; | |
776 | if (d) | |
777 | return d; | |
778 | ||
779 | /* short length > long length */ | |
780 | d = l2->length - l1->length; | |
781 | if (d) | |
782 | return d; | |
783 | ||
b1f69b75 | 784 | /* read > read/write */ |
fb3296eb | 785 | return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); |
b1f69b75 AA |
786 | } |
787 | ||
974cec8c AA |
788 | static void |
789 | pnfs_insert_layout(struct pnfs_layout_hdr *lo, | |
790 | struct pnfs_layout_segment *lseg) | |
791 | { | |
b1f69b75 | 792 | struct pnfs_layout_segment *lp; |
b1f69b75 | 793 | |
974cec8c AA |
794 | dprintk("%s:Begin\n", __func__); |
795 | ||
b7edfaa1 | 796 | assert_spin_locked(&lo->plh_inode->i_lock); |
b7edfaa1 | 797 | list_for_each_entry(lp, &lo->plh_segs, pls_list) { |
fb3296eb | 798 | if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0) |
b1f69b75 | 799 | continue; |
566052c5 | 800 | list_add_tail(&lseg->pls_list, &lp->pls_list); |
b1f69b75 AA |
801 | dprintk("%s: inserted lseg %p " |
802 | "iomode %d offset %llu length %llu before " | |
803 | "lp %p iomode %d offset %llu length %llu\n", | |
566052c5 FI |
804 | __func__, lseg, lseg->pls_range.iomode, |
805 | lseg->pls_range.offset, lseg->pls_range.length, | |
806 | lp, lp->pls_range.iomode, lp->pls_range.offset, | |
807 | lp->pls_range.length); | |
fb3296eb | 808 | goto out; |
974cec8c | 809 | } |
fb3296eb BH |
810 | list_add_tail(&lseg->pls_list, &lo->plh_segs); |
811 | dprintk("%s: inserted lseg %p " | |
812 | "iomode %d offset %llu length %llu at tail\n", | |
813 | __func__, lseg, lseg->pls_range.iomode, | |
814 | lseg->pls_range.offset, lseg->pls_range.length); | |
815 | out: | |
cc6e5340 | 816 | get_layout_hdr(lo); |
974cec8c AA |
817 | |
818 | dprintk("%s:Return\n", __func__); | |
e5e94017 BH |
819 | } |
820 | ||
821 | static struct pnfs_layout_hdr * | |
9fa40758 PT |
822 | alloc_init_layout_hdr(struct inode *ino, |
823 | struct nfs_open_context *ctx, | |
824 | gfp_t gfp_flags) | |
e5e94017 BH |
825 | { |
826 | struct pnfs_layout_hdr *lo; | |
827 | ||
636fb9c8 | 828 | lo = pnfs_alloc_layout_hdr(ino, gfp_flags); |
e5e94017 BH |
829 | if (!lo) |
830 | return NULL; | |
cc6e5340 | 831 | atomic_set(&lo->plh_refcount, 1); |
b7edfaa1 FI |
832 | INIT_LIST_HEAD(&lo->plh_layouts); |
833 | INIT_LIST_HEAD(&lo->plh_segs); | |
43f1b3da | 834 | INIT_LIST_HEAD(&lo->plh_bulk_recall); |
b7edfaa1 | 835 | lo->plh_inode = ino; |
9fa40758 | 836 | lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred); |
e5e94017 BH |
837 | return lo; |
838 | } | |
839 | ||
840 | static struct pnfs_layout_hdr * | |
9fa40758 PT |
841 | pnfs_find_alloc_layout(struct inode *ino, |
842 | struct nfs_open_context *ctx, | |
843 | gfp_t gfp_flags) | |
e5e94017 BH |
844 | { |
845 | struct nfs_inode *nfsi = NFS_I(ino); | |
846 | struct pnfs_layout_hdr *new = NULL; | |
847 | ||
848 | dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); | |
849 | ||
850 | assert_spin_locked(&ino->i_lock); | |
4541d16c FI |
851 | if (nfsi->layout) { |
852 | if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags)) | |
853 | return NULL; | |
854 | else | |
855 | return nfsi->layout; | |
856 | } | |
e5e94017 | 857 | spin_unlock(&ino->i_lock); |
9fa40758 | 858 | new = alloc_init_layout_hdr(ino, ctx, gfp_flags); |
e5e94017 BH |
859 | spin_lock(&ino->i_lock); |
860 | ||
861 | if (likely(nfsi->layout == NULL)) /* Won the race? */ | |
862 | nfsi->layout = new; | |
863 | else | |
636fb9c8 | 864 | pnfs_free_layout_hdr(new); |
e5e94017 BH |
865 | return nfsi->layout; |
866 | } | |
867 | ||
b1f69b75 AA |
868 | /* |
869 | * iomode matching rules: | |
870 | * iomode lseg match | |
871 | * ----- ----- ----- | |
872 | * ANY READ true | |
873 | * ANY RW true | |
874 | * RW READ false | |
875 | * RW RW true | |
876 | * READ READ true | |
877 | * READ RW true | |
878 | */ | |
879 | static int | |
fb3296eb BH |
880 | is_matching_lseg(struct pnfs_layout_range *ls_range, |
881 | struct pnfs_layout_range *range) | |
b1f69b75 | 882 | { |
fb3296eb BH |
883 | struct pnfs_layout_range range1; |
884 | ||
885 | if ((range->iomode == IOMODE_RW && | |
886 | ls_range->iomode != IOMODE_RW) || | |
887 | !lo_seg_intersecting(ls_range, range)) | |
888 | return 0; | |
889 | ||
890 | /* range1 covers only the first byte in the range */ | |
891 | range1 = *range; | |
892 | range1.length = 1; | |
893 | return lo_seg_contained(ls_range, &range1); | |
b1f69b75 AA |
894 | } |
895 | ||
896 | /* | |
897 | * lookup range in layout | |
898 | */ | |
e5e94017 | 899 | static struct pnfs_layout_segment * |
fb3296eb BH |
900 | pnfs_find_lseg(struct pnfs_layout_hdr *lo, |
901 | struct pnfs_layout_range *range) | |
e5e94017 | 902 | { |
b1f69b75 AA |
903 | struct pnfs_layout_segment *lseg, *ret = NULL; |
904 | ||
905 | dprintk("%s:Begin\n", __func__); | |
906 | ||
b7edfaa1 FI |
907 | assert_spin_locked(&lo->plh_inode->i_lock); |
908 | list_for_each_entry(lseg, &lo->plh_segs, pls_list) { | |
4541d16c | 909 | if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && |
fb3296eb | 910 | is_matching_lseg(&lseg->pls_range, range)) { |
d684d2ae | 911 | ret = get_lseg(lseg); |
b1f69b75 AA |
912 | break; |
913 | } | |
d771e3a4 | 914 | if (lseg->pls_range.offset > range->offset) |
b1f69b75 AA |
915 | break; |
916 | } | |
917 | ||
918 | dprintk("%s:Return lseg %p ref %d\n", | |
4541d16c | 919 | __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0); |
b1f69b75 | 920 | return ret; |
e5e94017 BH |
921 | } |
922 | ||
d23d61c8 AA |
923 | /* |
924 | * Use mdsthreshold hints set at each OPEN to determine if I/O should go | |
925 | * to the MDS or over pNFS | |
926 | * | |
927 | * The nfs_inode read_io and write_io fields are cumulative counters reset | |
928 | * when there are no layout segments. Note that in pnfs_update_layout iomode | |
929 | * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a | |
930 | * WRITE request. | |
931 | * | |
932 | * A return of true means use MDS I/O. | |
933 | * | |
934 | * From rfc 5661: | |
935 | * If a file's size is smaller than the file size threshold, data accesses | |
936 | * SHOULD be sent to the metadata server. If an I/O request has a length that | |
937 | * is below the I/O size threshold, the I/O SHOULD be sent to the metadata | |
938 | * server. If both file size and I/O size are provided, the client SHOULD | |
939 | * reach or exceed both thresholds before sending its read or write | |
940 | * requests to the data server. | |
941 | */ | |
942 | static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, | |
943 | struct inode *ino, int iomode) | |
944 | { | |
945 | struct nfs4_threshold *t = ctx->mdsthreshold; | |
946 | struct nfs_inode *nfsi = NFS_I(ino); | |
947 | loff_t fsize = i_size_read(ino); | |
948 | bool size = false, size_set = false, io = false, io_set = false, ret = false; | |
949 | ||
950 | if (t == NULL) | |
951 | return ret; | |
952 | ||
953 | dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", | |
954 | __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); | |
955 | ||
956 | switch (iomode) { | |
957 | case IOMODE_READ: | |
958 | if (t->bm & THRESHOLD_RD) { | |
959 | dprintk("%s fsize %llu\n", __func__, fsize); | |
960 | size_set = true; | |
961 | if (fsize < t->rd_sz) | |
962 | size = true; | |
963 | } | |
964 | if (t->bm & THRESHOLD_RD_IO) { | |
965 | dprintk("%s nfsi->read_io %llu\n", __func__, | |
966 | nfsi->read_io); | |
967 | io_set = true; | |
968 | if (nfsi->read_io < t->rd_io_sz) | |
969 | io = true; | |
970 | } | |
971 | break; | |
972 | case IOMODE_RW: | |
973 | if (t->bm & THRESHOLD_WR) { | |
974 | dprintk("%s fsize %llu\n", __func__, fsize); | |
975 | size_set = true; | |
976 | if (fsize < t->wr_sz) | |
977 | size = true; | |
978 | } | |
979 | if (t->bm & THRESHOLD_WR_IO) { | |
980 | dprintk("%s nfsi->write_io %llu\n", __func__, | |
981 | nfsi->write_io); | |
982 | io_set = true; | |
983 | if (nfsi->write_io < t->wr_io_sz) | |
984 | io = true; | |
985 | } | |
986 | break; | |
987 | } | |
988 | if (size_set && io_set) { | |
989 | if (size && io) | |
990 | ret = true; | |
991 | } else if (size || io) | |
992 | ret = true; | |
993 | ||
994 | dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); | |
995 | return ret; | |
996 | } | |
997 | ||
e5e94017 BH |
998 | /* |
999 | * Layout segment is retreived from the server if not cached. | |
1000 | * The appropriate layout segment is referenced and returned to the caller. | |
1001 | */ | |
7c24d948 | 1002 | struct pnfs_layout_segment * |
e5e94017 BH |
1003 | pnfs_update_layout(struct inode *ino, |
1004 | struct nfs_open_context *ctx, | |
fb3296eb BH |
1005 | loff_t pos, |
1006 | u64 count, | |
a75b9df9 TM |
1007 | enum pnfs_iomode iomode, |
1008 | gfp_t gfp_flags) | |
e5e94017 | 1009 | { |
fb3296eb BH |
1010 | struct pnfs_layout_range arg = { |
1011 | .iomode = iomode, | |
1012 | .offset = pos, | |
1013 | .length = count, | |
1014 | }; | |
707ed5fd | 1015 | unsigned pg_offset; |
e5e94017 | 1016 | struct nfs_inode *nfsi = NFS_I(ino); |
6382a441 WAA |
1017 | struct nfs_server *server = NFS_SERVER(ino); |
1018 | struct nfs_client *clp = server->nfs_client; | |
e5e94017 BH |
1019 | struct pnfs_layout_hdr *lo; |
1020 | struct pnfs_layout_segment *lseg = NULL; | |
f49f9baa | 1021 | bool first = false; |
e5e94017 BH |
1022 | |
1023 | if (!pnfs_enabled_sb(NFS_SERVER(ino))) | |
1024 | return NULL; | |
d23d61c8 AA |
1025 | |
1026 | if (pnfs_within_mdsthreshold(ctx, ino, iomode)) | |
1027 | return NULL; | |
1028 | ||
e5e94017 | 1029 | spin_lock(&ino->i_lock); |
9fa40758 | 1030 | lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); |
e5e94017 BH |
1031 | if (lo == NULL) { |
1032 | dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__); | |
1033 | goto out_unlock; | |
1034 | } | |
1035 | ||
43f1b3da | 1036 | /* Do we even need to bother with this? */ |
a59c30ac | 1037 | if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
43f1b3da | 1038 | dprintk("%s matches recall, use MDS\n", __func__); |
e5e94017 BH |
1039 | goto out_unlock; |
1040 | } | |
1041 | ||
1042 | /* if LAYOUTGET already failed once we don't try again */ | |
566052c5 | 1043 | if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags)) |
e5e94017 BH |
1044 | goto out_unlock; |
1045 | ||
568e8c49 | 1046 | /* Check to see if the layout for the given range already exists */ |
fb3296eb | 1047 | lseg = pnfs_find_lseg(lo, &arg); |
568e8c49 AA |
1048 | if (lseg) |
1049 | goto out_unlock; | |
1050 | ||
43f1b3da | 1051 | if (pnfs_layoutgets_blocked(lo, NULL, 0)) |
cf7d63f1 FI |
1052 | goto out_unlock; |
1053 | atomic_inc(&lo->plh_outstanding); | |
1054 | ||
cc6e5340 | 1055 | get_layout_hdr(lo); |
f49f9baa FI |
1056 | if (list_empty(&lo->plh_segs)) |
1057 | first = true; | |
366d5052 AA |
1058 | |
1059 | /* Enable LAYOUTRETURNs */ | |
1060 | pnfs_clear_layout_returned(lo); | |
1061 | ||
f49f9baa FI |
1062 | spin_unlock(&ino->i_lock); |
1063 | if (first) { | |
2130ff66 FI |
1064 | /* The lo must be on the clp list if there is any |
1065 | * chance of a CB_LAYOUTRECALL(FILE) coming in. | |
1066 | */ | |
1067 | spin_lock(&clp->cl_lock); | |
1068 | BUG_ON(!list_empty(&lo->plh_layouts)); | |
6382a441 | 1069 | list_add_tail(&lo->plh_layouts, &server->layouts); |
2130ff66 FI |
1070 | spin_unlock(&clp->cl_lock); |
1071 | } | |
e5e94017 | 1072 | |
707ed5fd BH |
1073 | pg_offset = arg.offset & ~PAGE_CACHE_MASK; |
1074 | if (pg_offset) { | |
1075 | arg.offset -= pg_offset; | |
1076 | arg.length += pg_offset; | |
1077 | } | |
7c24d948 AA |
1078 | if (arg.length != NFS4_MAX_UINT64) |
1079 | arg.length = PAGE_CACHE_ALIGN(arg.length); | |
707ed5fd | 1080 | |
fb3296eb | 1081 | lseg = send_layoutget(lo, ctx, &arg, gfp_flags); |
f49f9baa FI |
1082 | if (!lseg && first) { |
1083 | spin_lock(&clp->cl_lock); | |
1084 | list_del_init(&lo->plh_layouts); | |
1085 | spin_unlock(&clp->cl_lock); | |
2130ff66 | 1086 | } |
cf7d63f1 | 1087 | atomic_dec(&lo->plh_outstanding); |
cc6e5340 | 1088 | put_layout_hdr(lo); |
e5e94017 BH |
1089 | out: |
1090 | dprintk("%s end, state 0x%lx lseg %p\n", __func__, | |
bf9c1387 | 1091 | nfsi->layout ? nfsi->layout->plh_flags : -1, lseg); |
e5e94017 BH |
1092 | return lseg; |
1093 | out_unlock: | |
1094 | spin_unlock(&ino->i_lock); | |
1095 | goto out; | |
1096 | } | |
7c24d948 | 1097 | EXPORT_SYMBOL_GPL(pnfs_update_layout); |
b1f69b75 AA |
1098 | |
1099 | int | |
1100 | pnfs_layout_process(struct nfs4_layoutget *lgp) | |
1101 | { | |
1102 | struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; | |
1103 | struct nfs4_layoutget_res *res = &lgp->res; | |
1104 | struct pnfs_layout_segment *lseg; | |
b7edfaa1 | 1105 | struct inode *ino = lo->plh_inode; |
b1f69b75 AA |
1106 | int status = 0; |
1107 | ||
1108 | /* Inject layout blob into I/O device driver */ | |
a75b9df9 | 1109 | lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); |
b1f69b75 AA |
1110 | if (!lseg || IS_ERR(lseg)) { |
1111 | if (!lseg) | |
1112 | status = -ENOMEM; | |
1113 | else | |
1114 | status = PTR_ERR(lseg); | |
1115 | dprintk("%s: Could not allocate layout: error %d\n", | |
1116 | __func__, status); | |
1117 | goto out; | |
1118 | } | |
1119 | ||
1120 | spin_lock(&ino->i_lock); | |
a59c30ac | 1121 | if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
43f1b3da FI |
1122 | dprintk("%s forget reply due to recall\n", __func__); |
1123 | goto out_forget_reply; | |
1124 | } | |
1125 | ||
1126 | if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) { | |
1127 | dprintk("%s forget reply due to state\n", __func__); | |
1128 | goto out_forget_reply; | |
1129 | } | |
b1f69b75 | 1130 | init_lseg(lo, lseg); |
566052c5 | 1131 | lseg->pls_range = res->range; |
d684d2ae | 1132 | *lgp->lsegpp = get_lseg(lseg); |
b1f69b75 AA |
1133 | pnfs_insert_layout(lo, lseg); |
1134 | ||
f7e8917a FI |
1135 | if (res->return_on_close) { |
1136 | set_bit(NFS_LSEG_ROC, &lseg->pls_flags); | |
1137 | set_bit(NFS_LAYOUT_ROC, &lo->plh_flags); | |
1138 | } | |
1139 | ||
b1f69b75 | 1140 | /* Done processing layoutget. Set the layout stateid */ |
43f1b3da | 1141 | pnfs_set_layout_stateid(lo, &res->stateid, false); |
b1f69b75 AA |
1142 | spin_unlock(&ino->i_lock); |
1143 | out: | |
1144 | return status; | |
43f1b3da FI |
1145 | |
1146 | out_forget_reply: | |
1147 | spin_unlock(&ino->i_lock); | |
1148 | lseg->pls_layout = lo; | |
1149 | NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); | |
1150 | goto out; | |
b1f69b75 AA |
1151 | } |
1152 | ||
d8007d4d TM |
1153 | void |
1154 | pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) | |
1155 | { | |
1156 | BUG_ON(pgio->pg_lseg != NULL); | |
1157 | ||
1825a0d0 FI |
1158 | if (req->wb_offset != req->wb_pgbase) { |
1159 | nfs_pageio_reset_read_mds(pgio); | |
1160 | return; | |
1161 | } | |
d8007d4d TM |
1162 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
1163 | req->wb_context, | |
1164 | req_offset(req), | |
1165 | req->wb_bytes, | |
1166 | IOMODE_READ, | |
1167 | GFP_KERNEL); | |
e885de1a TM |
1168 | /* If no lseg, fall back to read through mds */ |
1169 | if (pgio->pg_lseg == NULL) | |
1f945357 | 1170 | nfs_pageio_reset_read_mds(pgio); |
e885de1a | 1171 | |
d8007d4d TM |
1172 | } |
1173 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); | |
1174 | ||
1175 | void | |
1176 | pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) | |
1177 | { | |
1178 | BUG_ON(pgio->pg_lseg != NULL); | |
1179 | ||
1825a0d0 FI |
1180 | if (req->wb_offset != req->wb_pgbase) { |
1181 | nfs_pageio_reset_write_mds(pgio); | |
1182 | return; | |
1183 | } | |
d8007d4d TM |
1184 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
1185 | req->wb_context, | |
1186 | req_offset(req), | |
1187 | req->wb_bytes, | |
1188 | IOMODE_RW, | |
1189 | GFP_NOFS); | |
e885de1a TM |
1190 | /* If no lseg, fall back to write through mds */ |
1191 | if (pgio->pg_lseg == NULL) | |
1f945357 | 1192 | nfs_pageio_reset_write_mds(pgio); |
d8007d4d TM |
1193 | } |
1194 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); | |
1195 | ||
1abb5088 | 1196 | void |
061ae2ed FI |
1197 | pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode, |
1198 | const struct nfs_pgio_completion_ops *compl_ops) | |
1751c363 TM |
1199 | { |
1200 | struct nfs_server *server = NFS_SERVER(inode); | |
1201 | struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; | |
1202 | ||
1203 | if (ld == NULL) | |
1abb5088 BS |
1204 | nfs_pageio_init_read(pgio, inode, compl_ops); |
1205 | else | |
1206 | nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0); | |
1751c363 TM |
1207 | } |
1208 | ||
57208fa7 | 1209 | void |
061ae2ed FI |
1210 | pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, |
1211 | int ioflags, | |
1212 | const struct nfs_pgio_completion_ops *compl_ops) | |
1751c363 TM |
1213 | { |
1214 | struct nfs_server *server = NFS_SERVER(inode); | |
1215 | struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; | |
1216 | ||
1217 | if (ld == NULL) | |
57208fa7 BS |
1218 | nfs_pageio_init_write(pgio, inode, ioflags, compl_ops); |
1219 | else | |
1220 | nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags); | |
1751c363 TM |
1221 | } |
1222 | ||
18ad0a9f | 1223 | bool |
dfed206b BH |
1224 | pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
1225 | struct nfs_page *req) | |
94ad1c80 | 1226 | { |
d8007d4d TM |
1227 | if (pgio->pg_lseg == NULL) |
1228 | return nfs_generic_pg_test(pgio, prev, req); | |
94ad1c80 | 1229 | |
19982ba8 TM |
1230 | /* |
1231 | * Test if a nfs_page is fully contained in the pnfs_layout_range. | |
1232 | * Note that this test makes several assumptions: | |
1233 | * - that the previous nfs_page in the struct nfs_pageio_descriptor | |
1234 | * is known to lie within the range. | |
1235 | * - that the nfs_page being tested is known to be contiguous with the | |
1236 | * previous nfs_page. | |
1237 | * - Layout ranges are page aligned, so we only have to test the | |
1238 | * start offset of the request. | |
1239 | * | |
1240 | * Please also note that 'end_offset' is actually the offset of the | |
1241 | * first byte that lies outside the pnfs_layout_range. FIXME? | |
1242 | * | |
1243 | */ | |
1244 | return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset, | |
1245 | pgio->pg_lseg->pls_range.length); | |
94ad1c80 | 1246 | } |
89a58e32 | 1247 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); |
94ad1c80 | 1248 | |
e7dd79af | 1249 | int pnfs_write_done_resend_to_mds(struct inode *inode, |
061ae2ed FI |
1250 | struct list_head *head, |
1251 | const struct nfs_pgio_completion_ops *compl_ops) | |
e2fecb21 TM |
1252 | { |
1253 | struct nfs_pageio_descriptor pgio; | |
1254 | LIST_HEAD(failed); | |
1255 | ||
1256 | /* Resend all requests through the MDS */ | |
57208fa7 | 1257 | nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops); |
e2fecb21 TM |
1258 | while (!list_empty(head)) { |
1259 | struct nfs_page *req = nfs_list_entry(head->next); | |
1260 | ||
1261 | nfs_list_remove_request(req); | |
1262 | if (!nfs_pageio_add_request(&pgio, req)) | |
1263 | nfs_list_add_request(req, &failed); | |
1264 | } | |
1265 | nfs_pageio_complete(&pgio); | |
1266 | ||
1267 | if (!list_empty(&failed)) { | |
1268 | /* For some reason our attempt to resend pages. Mark the | |
1269 | * overall send request as having failed, and let | |
1270 | * nfs_writeback_release_full deal with the error. | |
1271 | */ | |
1272 | list_move(&failed, head); | |
1273 | return -EIO; | |
1274 | } | |
1275 | return 0; | |
1276 | } | |
e7dd79af | 1277 | EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); |
e2fecb21 | 1278 | |
1acbbb4e FI |
1279 | static void pnfs_ld_handle_write_error(struct nfs_write_data *data) |
1280 | { | |
cd841605 FI |
1281 | struct nfs_pgio_header *hdr = data->header; |
1282 | ||
1283 | dprintk("pnfs write error = %d\n", hdr->pnfs_error); | |
1284 | if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & | |
1acbbb4e | 1285 | PNFS_LAYOUTRET_ON_ERROR) { |
cd841605 FI |
1286 | clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags); |
1287 | pnfs_return_layout(hdr->inode); | |
1acbbb4e | 1288 | } |
6c75dc0d FI |
1289 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
1290 | data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode, | |
061ae2ed FI |
1291 | &hdr->pages, |
1292 | hdr->completion_ops); | |
1acbbb4e FI |
1293 | } |
1294 | ||
d20581aa BH |
1295 | /* |
1296 | * Called by non rpc-based layout drivers | |
1297 | */ | |
8ce160c5 | 1298 | void pnfs_ld_write_done(struct nfs_write_data *data) |
44b83799 | 1299 | { |
cd841605 FI |
1300 | struct nfs_pgio_header *hdr = data->header; |
1301 | ||
1302 | if (!hdr->pnfs_error) { | |
d20581aa | 1303 | pnfs_set_layoutcommit(data); |
cd841605 | 1304 | hdr->mds_ops->rpc_call_done(&data->task, data); |
1acbbb4e FI |
1305 | } else |
1306 | pnfs_ld_handle_write_error(data); | |
cd841605 | 1307 | hdr->mds_ops->rpc_release(data); |
44b83799 | 1308 | } |
d20581aa | 1309 | EXPORT_SYMBOL_GPL(pnfs_ld_write_done); |
44b83799 | 1310 | |
dce81290 TM |
1311 | static void |
1312 | pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, | |
1313 | struct nfs_write_data *data) | |
1314 | { | |
cd841605 FI |
1315 | struct nfs_pgio_header *hdr = data->header; |
1316 | ||
6c75dc0d FI |
1317 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
1318 | list_splice_tail_init(&hdr->pages, &desc->pg_list); | |
1319 | nfs_pageio_reset_write_mds(desc); | |
1320 | desc->pg_recoalesce = 1; | |
1321 | } | |
dce81290 TM |
1322 | nfs_writedata_release(data); |
1323 | } | |
1324 | ||
1325 | static enum pnfs_try_status | |
0382b744 | 1326 | pnfs_try_to_write_data(struct nfs_write_data *wdata, |
dce81290 TM |
1327 | const struct rpc_call_ops *call_ops, |
1328 | struct pnfs_layout_segment *lseg, | |
1329 | int how) | |
0382b744 | 1330 | { |
cd841605 FI |
1331 | struct nfs_pgio_header *hdr = wdata->header; |
1332 | struct inode *inode = hdr->inode; | |
0382b744 AA |
1333 | enum pnfs_try_status trypnfs; |
1334 | struct nfs_server *nfss = NFS_SERVER(inode); | |
1335 | ||
cd841605 | 1336 | hdr->mds_ops = call_ops; |
0382b744 AA |
1337 | |
1338 | dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, | |
1339 | inode->i_ino, wdata->args.count, wdata->args.offset, how); | |
0382b744 | 1340 | trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how); |
6c75dc0d | 1341 | if (trypnfs != PNFS_NOT_ATTEMPTED) |
0382b744 | 1342 | nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); |
0382b744 AA |
1343 | dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
1344 | return trypnfs; | |
1345 | } | |
1346 | ||
dce81290 TM |
1347 | static void |
1348 | pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how) | |
1349 | { | |
1350 | struct nfs_write_data *data; | |
1351 | const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; | |
1352 | struct pnfs_layout_segment *lseg = desc->pg_lseg; | |
1353 | ||
1354 | desc->pg_lseg = NULL; | |
1355 | while (!list_empty(head)) { | |
1356 | enum pnfs_try_status trypnfs; | |
1357 | ||
6c75dc0d | 1358 | data = list_first_entry(head, struct nfs_write_data, list); |
dce81290 TM |
1359 | list_del_init(&data->list); |
1360 | ||
1361 | trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how); | |
1362 | if (trypnfs == PNFS_NOT_ATTEMPTED) | |
1363 | pnfs_write_through_mds(desc, data); | |
1364 | } | |
1365 | put_lseg(lseg); | |
1366 | } | |
1367 | ||
6c75dc0d FI |
1368 | static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) |
1369 | { | |
1370 | put_lseg(hdr->lseg); | |
1371 | nfs_writehdr_free(hdr); | |
1372 | } | |
89d77c8f | 1373 | EXPORT_SYMBOL_GPL(pnfs_writehdr_free); |
6c75dc0d | 1374 | |
dce81290 TM |
1375 | int |
1376 | pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) | |
1377 | { | |
6c75dc0d FI |
1378 | struct nfs_write_header *whdr; |
1379 | struct nfs_pgio_header *hdr; | |
dce81290 TM |
1380 | int ret; |
1381 | ||
6c75dc0d FI |
1382 | whdr = nfs_writehdr_alloc(); |
1383 | if (!whdr) { | |
9b5415b5 | 1384 | desc->pg_completion_ops->error_cleanup(&desc->pg_list); |
dce81290 TM |
1385 | put_lseg(desc->pg_lseg); |
1386 | desc->pg_lseg = NULL; | |
6c75dc0d | 1387 | return -ENOMEM; |
dce81290 | 1388 | } |
6c75dc0d FI |
1389 | hdr = &whdr->header; |
1390 | nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); | |
1391 | hdr->lseg = get_lseg(desc->pg_lseg); | |
1392 | atomic_inc(&hdr->refcnt); | |
1393 | ret = nfs_generic_flush(desc, hdr); | |
1394 | if (ret != 0) { | |
1395 | put_lseg(desc->pg_lseg); | |
1396 | desc->pg_lseg = NULL; | |
6c75dc0d FI |
1397 | } else |
1398 | pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags); | |
1399 | if (atomic_dec_and_test(&hdr->refcnt)) | |
061ae2ed | 1400 | hdr->completion_ops->completion(hdr); |
6c75dc0d | 1401 | return ret; |
dce81290 TM |
1402 | } |
1403 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); | |
1404 | ||
e7dd79af | 1405 | int pnfs_read_done_resend_to_mds(struct inode *inode, |
061ae2ed FI |
1406 | struct list_head *head, |
1407 | const struct nfs_pgio_completion_ops *compl_ops) | |
62e4a769 TM |
1408 | { |
1409 | struct nfs_pageio_descriptor pgio; | |
1acbbb4e | 1410 | LIST_HEAD(failed); |
62e4a769 | 1411 | |
1acbbb4e | 1412 | /* Resend all requests through the MDS */ |
1abb5088 | 1413 | nfs_pageio_init_read(&pgio, inode, compl_ops); |
1acbbb4e FI |
1414 | while (!list_empty(head)) { |
1415 | struct nfs_page *req = nfs_list_entry(head->next); | |
62e4a769 TM |
1416 | |
1417 | nfs_list_remove_request(req); | |
1acbbb4e FI |
1418 | if (!nfs_pageio_add_request(&pgio, req)) |
1419 | nfs_list_add_request(req, &failed); | |
62e4a769 TM |
1420 | } |
1421 | nfs_pageio_complete(&pgio); | |
1acbbb4e FI |
1422 | |
1423 | if (!list_empty(&failed)) { | |
1424 | list_move(&failed, head); | |
1425 | return -EIO; | |
1426 | } | |
1427 | return 0; | |
1428 | } | |
e7dd79af | 1429 | EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); |
1acbbb4e FI |
1430 | |
1431 | static void pnfs_ld_handle_read_error(struct nfs_read_data *data) | |
1432 | { | |
cd841605 FI |
1433 | struct nfs_pgio_header *hdr = data->header; |
1434 | ||
1435 | dprintk("pnfs read error = %d\n", hdr->pnfs_error); | |
1436 | if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & | |
1acbbb4e | 1437 | PNFS_LAYOUTRET_ON_ERROR) { |
cd841605 FI |
1438 | clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags); |
1439 | pnfs_return_layout(hdr->inode); | |
1acbbb4e | 1440 | } |
4db6e0b7 FI |
1441 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
1442 | data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode, | |
061ae2ed FI |
1443 | &hdr->pages, |
1444 | hdr->completion_ops); | |
62e4a769 TM |
1445 | } |
1446 | ||
d20581aa BH |
1447 | /* |
1448 | * Called by non rpc-based layout drivers | |
1449 | */ | |
9b7eecdc | 1450 | void pnfs_ld_read_done(struct nfs_read_data *data) |
d20581aa | 1451 | { |
cd841605 FI |
1452 | struct nfs_pgio_header *hdr = data->header; |
1453 | ||
1454 | if (likely(!hdr->pnfs_error)) { | |
d20581aa | 1455 | __nfs4_read_done_cb(data); |
cd841605 | 1456 | hdr->mds_ops->rpc_call_done(&data->task, data); |
62e4a769 TM |
1457 | } else |
1458 | pnfs_ld_handle_read_error(data); | |
cd841605 | 1459 | hdr->mds_ops->rpc_release(data); |
d20581aa BH |
1460 | } |
1461 | EXPORT_SYMBOL_GPL(pnfs_ld_read_done); | |
1462 | ||
493292dd TM |
1463 | static void |
1464 | pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, | |
1465 | struct nfs_read_data *data) | |
1466 | { | |
cd841605 FI |
1467 | struct nfs_pgio_header *hdr = data->header; |
1468 | ||
4db6e0b7 FI |
1469 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
1470 | list_splice_tail_init(&hdr->pages, &desc->pg_list); | |
1471 | nfs_pageio_reset_read_mds(desc); | |
1472 | desc->pg_recoalesce = 1; | |
1473 | } | |
493292dd TM |
1474 | nfs_readdata_release(data); |
1475 | } | |
1476 | ||
64419a9b AA |
1477 | /* |
1478 | * Call the appropriate parallel I/O subsystem read function. | |
1479 | */ | |
493292dd | 1480 | static enum pnfs_try_status |
64419a9b | 1481 | pnfs_try_to_read_data(struct nfs_read_data *rdata, |
493292dd TM |
1482 | const struct rpc_call_ops *call_ops, |
1483 | struct pnfs_layout_segment *lseg) | |
64419a9b | 1484 | { |
cd841605 FI |
1485 | struct nfs_pgio_header *hdr = rdata->header; |
1486 | struct inode *inode = hdr->inode; | |
64419a9b AA |
1487 | struct nfs_server *nfss = NFS_SERVER(inode); |
1488 | enum pnfs_try_status trypnfs; | |
1489 | ||
cd841605 | 1490 | hdr->mds_ops = call_ops; |
64419a9b AA |
1491 | |
1492 | dprintk("%s: Reading ino:%lu %u@%llu\n", | |
1493 | __func__, inode->i_ino, rdata->args.count, rdata->args.offset); | |
1494 | ||
1495 | trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata); | |
4db6e0b7 | 1496 | if (trypnfs != PNFS_NOT_ATTEMPTED) |
64419a9b | 1497 | nfs_inc_stats(inode, NFSIOS_PNFS_READ); |
64419a9b AA |
1498 | dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
1499 | return trypnfs; | |
1500 | } | |
863a3c6c | 1501 | |
493292dd TM |
1502 | static void |
1503 | pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head) | |
1504 | { | |
1505 | struct nfs_read_data *data; | |
1506 | const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; | |
1507 | struct pnfs_layout_segment *lseg = desc->pg_lseg; | |
1508 | ||
1509 | desc->pg_lseg = NULL; | |
1510 | while (!list_empty(head)) { | |
1511 | enum pnfs_try_status trypnfs; | |
1512 | ||
4db6e0b7 | 1513 | data = list_first_entry(head, struct nfs_read_data, list); |
493292dd TM |
1514 | list_del_init(&data->list); |
1515 | ||
1516 | trypnfs = pnfs_try_to_read_data(data, call_ops, lseg); | |
1517 | if (trypnfs == PNFS_NOT_ATTEMPTED) | |
1518 | pnfs_read_through_mds(desc, data); | |
1519 | } | |
1520 | put_lseg(lseg); | |
1521 | } | |
1522 | ||
4db6e0b7 FI |
1523 | static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) |
1524 | { | |
1525 | put_lseg(hdr->lseg); | |
1526 | nfs_readhdr_free(hdr); | |
1527 | } | |
89d77c8f | 1528 | EXPORT_SYMBOL_GPL(pnfs_readhdr_free); |
4db6e0b7 | 1529 | |
493292dd TM |
1530 | int |
1531 | pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) | |
1532 | { | |
4db6e0b7 FI |
1533 | struct nfs_read_header *rhdr; |
1534 | struct nfs_pgio_header *hdr; | |
493292dd TM |
1535 | int ret; |
1536 | ||
4db6e0b7 FI |
1537 | rhdr = nfs_readhdr_alloc(); |
1538 | if (!rhdr) { | |
061ae2ed | 1539 | desc->pg_completion_ops->error_cleanup(&desc->pg_list); |
4db6e0b7 | 1540 | ret = -ENOMEM; |
493292dd TM |
1541 | put_lseg(desc->pg_lseg); |
1542 | desc->pg_lseg = NULL; | |
1543 | return ret; | |
1544 | } | |
4db6e0b7 FI |
1545 | hdr = &rhdr->header; |
1546 | nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); | |
1547 | hdr->lseg = get_lseg(desc->pg_lseg); | |
1548 | atomic_inc(&hdr->refcnt); | |
1549 | ret = nfs_generic_pagein(desc, hdr); | |
1550 | if (ret != 0) { | |
1551 | put_lseg(desc->pg_lseg); | |
1552 | desc->pg_lseg = NULL; | |
4db6e0b7 FI |
1553 | } else |
1554 | pnfs_do_multiple_reads(desc, &hdr->rpc_list); | |
1555 | if (atomic_dec_and_test(&hdr->refcnt)) | |
061ae2ed | 1556 | hdr->completion_ops->completion(hdr); |
4db6e0b7 | 1557 | return ret; |
493292dd TM |
1558 | } |
1559 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); | |
1560 | ||
863a3c6c | 1561 | /* |
a9bae566 | 1562 | * There can be multiple RW segments. |
863a3c6c | 1563 | */ |
a9bae566 | 1564 | static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) |
863a3c6c | 1565 | { |
a9bae566 | 1566 | struct pnfs_layout_segment *lseg; |
863a3c6c | 1567 | |
a9bae566 PT |
1568 | list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { |
1569 | if (lseg->pls_range.iomode == IOMODE_RW && | |
1570 | test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) | |
1571 | list_add(&lseg->pls_lc_list, listp); | |
1572 | } | |
863a3c6c AA |
1573 | } |
1574 | ||
1b0ae068 PT |
1575 | void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) |
1576 | { | |
1577 | if (lseg->pls_range.iomode == IOMODE_RW) { | |
1578 | dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__); | |
1579 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
1580 | } else { | |
1581 | dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__); | |
1582 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
1583 | } | |
1584 | } | |
1585 | EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); | |
1586 | ||
863a3c6c AA |
1587 | void |
1588 | pnfs_set_layoutcommit(struct nfs_write_data *wdata) | |
1589 | { | |
cd841605 FI |
1590 | struct nfs_pgio_header *hdr = wdata->header; |
1591 | struct inode *inode = hdr->inode; | |
1592 | struct nfs_inode *nfsi = NFS_I(inode); | |
4b8ee2b8 | 1593 | loff_t end_pos = wdata->mds_offset + wdata->res.count; |
79a48a1f | 1594 | bool mark_as_dirty = false; |
863a3c6c | 1595 | |
cd841605 | 1596 | spin_lock(&inode->i_lock); |
863a3c6c | 1597 | if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { |
79a48a1f | 1598 | mark_as_dirty = true; |
863a3c6c | 1599 | dprintk("%s: Set layoutcommit for inode %lu ", |
cd841605 | 1600 | __func__, inode->i_ino); |
863a3c6c | 1601 | } |
cd841605 | 1602 | if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) { |
a9bae566 | 1603 | /* references matched in nfs4_layoutcommit_release */ |
cd841605 | 1604 | get_lseg(hdr->lseg); |
a9bae566 | 1605 | } |
acff5880 PT |
1606 | if (end_pos > nfsi->layout->plh_lwb) |
1607 | nfsi->layout->plh_lwb = end_pos; | |
cd841605 | 1608 | spin_unlock(&inode->i_lock); |
acff5880 | 1609 | dprintk("%s: lseg %p end_pos %llu\n", |
cd841605 | 1610 | __func__, hdr->lseg, nfsi->layout->plh_lwb); |
79a48a1f WAA |
1611 | |
1612 | /* if pnfs_layoutcommit_inode() runs between inode locks, the next one | |
1613 | * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ | |
1614 | if (mark_as_dirty) | |
cd841605 | 1615 | mark_inode_dirty_sync(inode); |
863a3c6c AA |
1616 | } |
1617 | EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); | |
1618 | ||
db29c089 AA |
1619 | void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) |
1620 | { | |
1621 | struct nfs_server *nfss = NFS_SERVER(data->args.inode); | |
1622 | ||
1623 | if (nfss->pnfs_curr_ld->cleanup_layoutcommit) | |
1624 | nfss->pnfs_curr_ld->cleanup_layoutcommit(data); | |
1625 | } | |
1626 | ||
de4b15c7 AA |
1627 | /* |
1628 | * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and | |
1629 | * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough | |
1630 | * data to disk to allow the server to recover the data if it crashes. | |
1631 | * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag | |
1632 | * is off, and a COMMIT is sent to a data server, or | |
1633 | * if WRITEs to a data server return NFS_DATA_SYNC. | |
1634 | */ | |
863a3c6c | 1635 | int |
ef311537 | 1636 | pnfs_layoutcommit_inode(struct inode *inode, bool sync) |
863a3c6c AA |
1637 | { |
1638 | struct nfs4_layoutcommit_data *data; | |
1639 | struct nfs_inode *nfsi = NFS_I(inode); | |
863a3c6c AA |
1640 | loff_t end_pos; |
1641 | int status = 0; | |
1642 | ||
1643 | dprintk("--> %s inode %lu\n", __func__, inode->i_ino); | |
1644 | ||
de4b15c7 AA |
1645 | if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
1646 | return 0; | |
1647 | ||
863a3c6c AA |
1648 | /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ |
1649 | data = kzalloc(sizeof(*data), GFP_NOFS); | |
de4b15c7 | 1650 | if (!data) { |
de4b15c7 AA |
1651 | status = -ENOMEM; |
1652 | goto out; | |
1653 | } | |
863a3c6c | 1654 | |
92407e75 PT |
1655 | if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
1656 | goto out_free; | |
1657 | ||
1658 | if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { | |
1659 | if (!sync) { | |
1660 | status = -EAGAIN; | |
1661 | goto out_free; | |
1662 | } | |
1663 | status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING, | |
1664 | nfs_wait_bit_killable, TASK_KILLABLE); | |
1665 | if (status) | |
1666 | goto out_free; | |
1667 | } | |
1668 | ||
a9bae566 | 1669 | INIT_LIST_HEAD(&data->lseg_list); |
de4b15c7 | 1670 | spin_lock(&inode->i_lock); |
863a3c6c | 1671 | if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { |
92407e75 | 1672 | clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags); |
863a3c6c | 1673 | spin_unlock(&inode->i_lock); |
92407e75 PT |
1674 | wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING); |
1675 | goto out_free; | |
863a3c6c | 1676 | } |
a9bae566 PT |
1677 | |
1678 | pnfs_list_write_lseg(inode, &data->lseg_list); | |
863a3c6c | 1679 | |
acff5880 | 1680 | end_pos = nfsi->layout->plh_lwb; |
acff5880 | 1681 | nfsi->layout->plh_lwb = 0; |
863a3c6c | 1682 | |
f597c537 | 1683 | nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); |
863a3c6c AA |
1684 | spin_unlock(&inode->i_lock); |
1685 | ||
1686 | data->args.inode = inode; | |
9fa40758 | 1687 | data->cred = get_rpccred(nfsi->layout->plh_lc_cred); |
863a3c6c AA |
1688 | nfs_fattr_init(&data->fattr); |
1689 | data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; | |
1690 | data->res.fattr = &data->fattr; | |
1691 | data->args.lastbytewritten = end_pos - 1; | |
1692 | data->res.server = NFS_SERVER(inode); | |
1693 | ||
1694 | status = nfs4_proc_layoutcommit(data, sync); | |
1695 | out: | |
92407e75 PT |
1696 | if (status) |
1697 | mark_inode_dirty_sync(inode); | |
863a3c6c AA |
1698 | dprintk("<-- %s status %d\n", __func__, status); |
1699 | return status; | |
92407e75 PT |
1700 | out_free: |
1701 | kfree(data); | |
1702 | goto out; | |
863a3c6c | 1703 | } |
82be417a AA |
1704 | |
1705 | struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) | |
1706 | { | |
1707 | struct nfs4_threshold *thp; | |
1708 | ||
1709 | thp = kzalloc(sizeof(*thp), GFP_NOFS); | |
1710 | if (!thp) { | |
1711 | dprintk("%s mdsthreshold allocation failed\n", __func__); | |
1712 | return NULL; | |
1713 | } | |
1714 | return thp; | |
1715 | } |