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1 /*
2 * (C) 2001 Clemson University and The University of Chicago
3 *
4 * See COPYING in top-level directory.
5 */
6
7 #include "protocol.h"
8 #include "orangefs-kernel.h"
9 #include "orangefs-bufmap.h"
10
11 #include <linux/parser.h>
12
13 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
14 static struct kmem_cache *orangefs_inode_cache;
15
16 /* list for storing orangefs specific superblocks in use */
17 LIST_HEAD(orangefs_superblocks);
18
19 DEFINE_SPINLOCK(orangefs_superblocks_lock);
20
21 enum {
22 Opt_intr,
23 Opt_acl,
24 Opt_local_lock,
25
26 Opt_err
27 };
28
29 static const match_table_t tokens = {
30 { Opt_acl, "acl" },
31 { Opt_intr, "intr" },
32 { Opt_local_lock, "local_lock" },
33 { Opt_err, NULL }
34 };
35
36 uint64_t orangefs_features;
37
38 static int orangefs_show_options(struct seq_file *m, struct dentry *root)
39 {
40 struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(root->d_sb);
41
42 if (root->d_sb->s_flags & MS_POSIXACL)
43 seq_puts(m, ",acl");
44 if (orangefs_sb->flags & ORANGEFS_OPT_INTR)
45 seq_puts(m, ",intr");
46 if (orangefs_sb->flags & ORANGEFS_OPT_LOCAL_LOCK)
47 seq_puts(m, ",local_lock");
48 return 0;
49 }
50
51 static int parse_mount_options(struct super_block *sb, char *options,
52 int silent)
53 {
54 struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
55 substring_t args[MAX_OPT_ARGS];
56 char *p;
57
58 /*
59 * Force any potential flags that might be set from the mount
60 * to zero, ie, initialize to unset.
61 */
62 sb->s_flags &= ~MS_POSIXACL;
63 orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
64 orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
65
66 while ((p = strsep(&options, ",")) != NULL) {
67 int token;
68
69 if (!*p)
70 continue;
71
72 token = match_token(p, tokens, args);
73 switch (token) {
74 case Opt_acl:
75 sb->s_flags |= MS_POSIXACL;
76 break;
77 case Opt_intr:
78 orangefs_sb->flags |= ORANGEFS_OPT_INTR;
79 break;
80 case Opt_local_lock:
81 orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
82 break;
83 default:
84 goto fail;
85 }
86 }
87
88 return 0;
89 fail:
90 if (!silent)
91 gossip_err("Error: mount option [%s] is not supported.\n", p);
92 return -EINVAL;
93 }
94
95 static void orangefs_inode_cache_ctor(void *req)
96 {
97 struct orangefs_inode_s *orangefs_inode = req;
98
99 inode_init_once(&orangefs_inode->vfs_inode);
100 init_rwsem(&orangefs_inode->xattr_sem);
101
102 orangefs_inode->vfs_inode.i_version = 1;
103 }
104
105 static struct inode *orangefs_alloc_inode(struct super_block *sb)
106 {
107 struct orangefs_inode_s *orangefs_inode;
108
109 orangefs_inode = kmem_cache_alloc(orangefs_inode_cache, GFP_KERNEL);
110 if (orangefs_inode == NULL) {
111 gossip_err("Failed to allocate orangefs_inode\n");
112 return NULL;
113 }
114
115 /*
116 * We want to clear everything except for rw_semaphore and the
117 * vfs_inode.
118 */
119 memset(&orangefs_inode->refn.khandle, 0, 16);
120 orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
121 orangefs_inode->last_failed_block_index_read = 0;
122 memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
123 orangefs_inode->pinode_flags = 0;
124
125 gossip_debug(GOSSIP_SUPER_DEBUG,
126 "orangefs_alloc_inode: allocated %p\n",
127 &orangefs_inode->vfs_inode);
128 return &orangefs_inode->vfs_inode;
129 }
130
131 static void orangefs_i_callback(struct rcu_head *head)
132 {
133 struct inode *inode = container_of(head, struct inode, i_rcu);
134 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
135 kmem_cache_free(orangefs_inode_cache, orangefs_inode);
136 }
137
138 static void orangefs_destroy_inode(struct inode *inode)
139 {
140 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
141
142 gossip_debug(GOSSIP_SUPER_DEBUG,
143 "%s: deallocated %p destroying inode %pU\n",
144 __func__, orangefs_inode, get_khandle_from_ino(inode));
145
146 call_rcu(&inode->i_rcu, orangefs_i_callback);
147 }
148
149 /*
150 * NOTE: information filled in here is typically reflected in the
151 * output of the system command 'df'
152 */
153 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
154 {
155 int ret = -ENOMEM;
156 struct orangefs_kernel_op_s *new_op = NULL;
157 int flags = 0;
158 struct super_block *sb = NULL;
159
160 sb = dentry->d_sb;
161
162 gossip_debug(GOSSIP_SUPER_DEBUG,
163 "orangefs_statfs: called on sb %p (fs_id is %d)\n",
164 sb,
165 (int)(ORANGEFS_SB(sb)->fs_id));
166
167 new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
168 if (!new_op)
169 return ret;
170 new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
171
172 if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
173 flags = ORANGEFS_OP_INTERRUPTIBLE;
174
175 ret = service_operation(new_op, "orangefs_statfs", flags);
176
177 if (new_op->downcall.status < 0)
178 goto out_op_release;
179
180 gossip_debug(GOSSIP_SUPER_DEBUG,
181 "%s: got %ld blocks available | "
182 "%ld blocks total | %ld block size | "
183 "%ld files total | %ld files avail\n",
184 __func__,
185 (long)new_op->downcall.resp.statfs.blocks_avail,
186 (long)new_op->downcall.resp.statfs.blocks_total,
187 (long)new_op->downcall.resp.statfs.block_size,
188 (long)new_op->downcall.resp.statfs.files_total,
189 (long)new_op->downcall.resp.statfs.files_avail);
190
191 buf->f_type = sb->s_magic;
192 memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
193 buf->f_bsize = new_op->downcall.resp.statfs.block_size;
194 buf->f_namelen = ORANGEFS_NAME_MAX;
195
196 buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
197 buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
198 buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
199 buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
200 buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
201 buf->f_frsize = sb->s_blocksize;
202
203 out_op_release:
204 op_release(new_op);
205 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_statfs: returning %d\n", ret);
206 return ret;
207 }
208
209 /*
210 * Remount as initiated by VFS layer. We just need to reparse the mount
211 * options, no need to signal pvfs2-client-core about it.
212 */
213 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
214 {
215 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
216 return parse_mount_options(sb, data, 1);
217 }
218
219 /*
220 * Remount as initiated by pvfs2-client-core on restart. This is used to
221 * repopulate mount information left from previous pvfs2-client-core.
222 *
223 * the idea here is that given a valid superblock, we're
224 * re-initializing the user space client with the initial mount
225 * information specified when the super block was first initialized.
226 * this is very different than the first initialization/creation of a
227 * superblock. we use the special service_priority_operation to make
228 * sure that the mount gets ahead of any other pending operation that
229 * is waiting for servicing. this means that the pvfs2-client won't
230 * fail to start several times for all other pending operations before
231 * the client regains all of the mount information from us.
232 * NOTE: this function assumes that the request_mutex is already acquired!
233 */
234 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
235 {
236 struct orangefs_kernel_op_s *new_op;
237 int ret = -EINVAL;
238
239 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
240
241 new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
242 if (!new_op)
243 return -ENOMEM;
244 strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
245 orangefs_sb->devname,
246 ORANGEFS_MAX_SERVER_ADDR_LEN);
247
248 gossip_debug(GOSSIP_SUPER_DEBUG,
249 "Attempting ORANGEFS Remount via host %s\n",
250 new_op->upcall.req.fs_mount.orangefs_config_server);
251
252 /*
253 * we assume that the calling function has already acquired the
254 * request_mutex to prevent other operations from bypassing
255 * this one
256 */
257 ret = service_operation(new_op, "orangefs_remount",
258 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
259 gossip_debug(GOSSIP_SUPER_DEBUG,
260 "orangefs_remount: mount got return value of %d\n",
261 ret);
262 if (ret == 0) {
263 /*
264 * store the id assigned to this sb -- it's just a
265 * short-lived mapping that the system interface uses
266 * to map this superblock to a particular mount entry
267 */
268 orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
269 orangefs_sb->mount_pending = 0;
270 }
271
272 op_release(new_op);
273
274 if (orangefs_userspace_version >= 20906) {
275 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
276 if (!new_op)
277 return -ENOMEM;
278 new_op->upcall.req.features.features = 0;
279 ret = service_operation(new_op, "orangefs_features",
280 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
281 if (!ret)
282 orangefs_features =
283 new_op->downcall.resp.features.features;
284 else
285 orangefs_features = 0;
286 op_release(new_op);
287 } else {
288 orangefs_features = 0;
289 }
290
291 return ret;
292 }
293
294 int fsid_key_table_initialize(void)
295 {
296 return 0;
297 }
298
299 void fsid_key_table_finalize(void)
300 {
301 }
302
303 /* Called whenever the VFS dirties the inode in response to atime updates */
304 static void orangefs_dirty_inode(struct inode *inode, int flags)
305 {
306 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
307
308 gossip_debug(GOSSIP_SUPER_DEBUG,
309 "orangefs_dirty_inode: %pU\n",
310 get_khandle_from_ino(inode));
311 SetAtimeFlag(orangefs_inode);
312 }
313
314 static const struct super_operations orangefs_s_ops = {
315 .alloc_inode = orangefs_alloc_inode,
316 .destroy_inode = orangefs_destroy_inode,
317 .dirty_inode = orangefs_dirty_inode,
318 .drop_inode = generic_delete_inode,
319 .statfs = orangefs_statfs,
320 .remount_fs = orangefs_remount_fs,
321 .show_options = orangefs_show_options,
322 };
323
324 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
325 struct fid *fid,
326 int fh_len,
327 int fh_type)
328 {
329 struct orangefs_object_kref refn;
330
331 if (fh_len < 5 || fh_type > 2)
332 return NULL;
333
334 ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
335 refn.fs_id = (u32) fid->raw[4];
336 gossip_debug(GOSSIP_SUPER_DEBUG,
337 "fh_to_dentry: handle %pU, fs_id %d\n",
338 &refn.khandle,
339 refn.fs_id);
340
341 return d_obtain_alias(orangefs_iget(sb, &refn));
342 }
343
344 static int orangefs_encode_fh(struct inode *inode,
345 __u32 *fh,
346 int *max_len,
347 struct inode *parent)
348 {
349 int len = parent ? 10 : 5;
350 int type = 1;
351 struct orangefs_object_kref refn;
352
353 if (*max_len < len) {
354 gossip_lerr("fh buffer is too small for encoding\n");
355 *max_len = len;
356 type = 255;
357 goto out;
358 }
359
360 refn = ORANGEFS_I(inode)->refn;
361 ORANGEFS_khandle_to(&refn.khandle, fh, 16);
362 fh[4] = refn.fs_id;
363
364 gossip_debug(GOSSIP_SUPER_DEBUG,
365 "Encoding fh: handle %pU, fsid %u\n",
366 &refn.khandle,
367 refn.fs_id);
368
369
370 if (parent) {
371 refn = ORANGEFS_I(parent)->refn;
372 ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
373 fh[9] = refn.fs_id;
374
375 type = 2;
376 gossip_debug(GOSSIP_SUPER_DEBUG,
377 "Encoding parent: handle %pU, fsid %u\n",
378 &refn.khandle,
379 refn.fs_id);
380 }
381 *max_len = len;
382
383 out:
384 return type;
385 }
386
387 static const struct export_operations orangefs_export_ops = {
388 .encode_fh = orangefs_encode_fh,
389 .fh_to_dentry = orangefs_fh_to_dentry,
390 };
391
392 static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
393 {
394 struct orangefs_kernel_op_s *op;
395 int r;
396 op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT);
397 if (!op)
398 return -ENOMEM;
399 op->upcall.req.fs_umount.id = id;
400 op->upcall.req.fs_umount.fs_id = fs_id;
401 strncpy(op->upcall.req.fs_umount.orangefs_config_server,
402 devname, ORANGEFS_MAX_SERVER_ADDR_LEN);
403 r = service_operation(op, "orangefs_fs_umount", 0);
404 /* Not much to do about an error here. */
405 if (r)
406 gossip_err("orangefs_unmount: service_operation %d\n", r);
407 op_release(op);
408 return r;
409 }
410
411 static int orangefs_fill_sb(struct super_block *sb,
412 struct orangefs_fs_mount_response *fs_mount,
413 void *data, int silent)
414 {
415 int ret = -EINVAL;
416 struct inode *root = NULL;
417 struct dentry *root_dentry = NULL;
418 struct orangefs_object_kref root_object;
419
420 /* alloc and init our private orangefs sb info */
421 sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
422 if (!ORANGEFS_SB(sb))
423 return -ENOMEM;
424 ORANGEFS_SB(sb)->sb = sb;
425
426 ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
427 ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
428 ORANGEFS_SB(sb)->id = fs_mount->id;
429
430 if (data) {
431 ret = parse_mount_options(sb, data, silent);
432 if (ret)
433 return ret;
434 }
435
436 /* Hang the xattr handlers off the superblock */
437 sb->s_xattr = orangefs_xattr_handlers;
438 sb->s_magic = ORANGEFS_SUPER_MAGIC;
439 sb->s_op = &orangefs_s_ops;
440 sb->s_d_op = &orangefs_dentry_operations;
441
442 sb->s_blocksize = orangefs_bufmap_size_query();
443 sb->s_blocksize_bits = orangefs_bufmap_shift_query();
444 sb->s_maxbytes = MAX_LFS_FILESIZE;
445
446 root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
447 root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
448 gossip_debug(GOSSIP_SUPER_DEBUG,
449 "get inode %pU, fsid %d\n",
450 &root_object.khandle,
451 root_object.fs_id);
452
453 root = orangefs_iget(sb, &root_object);
454 if (IS_ERR(root))
455 return PTR_ERR(root);
456
457 gossip_debug(GOSSIP_SUPER_DEBUG,
458 "Allocated root inode [%p] with mode %x\n",
459 root,
460 root->i_mode);
461
462 /* allocates and places root dentry in dcache */
463 root_dentry = d_make_root(root);
464 if (!root_dentry)
465 return -ENOMEM;
466
467 sb->s_export_op = &orangefs_export_ops;
468 sb->s_root = root_dentry;
469 return 0;
470 }
471
472 struct dentry *orangefs_mount(struct file_system_type *fst,
473 int flags,
474 const char *devname,
475 void *data)
476 {
477 int ret = -EINVAL;
478 struct super_block *sb = ERR_PTR(-EINVAL);
479 struct orangefs_kernel_op_s *new_op;
480 struct dentry *d = ERR_PTR(-EINVAL);
481
482 gossip_debug(GOSSIP_SUPER_DEBUG,
483 "orangefs_mount: called with devname %s\n",
484 devname);
485
486 if (!devname) {
487 gossip_err("ERROR: device name not specified.\n");
488 return ERR_PTR(-EINVAL);
489 }
490
491 new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
492 if (!new_op)
493 return ERR_PTR(-ENOMEM);
494
495 strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
496 devname,
497 ORANGEFS_MAX_SERVER_ADDR_LEN);
498
499 gossip_debug(GOSSIP_SUPER_DEBUG,
500 "Attempting ORANGEFS Mount via host %s\n",
501 new_op->upcall.req.fs_mount.orangefs_config_server);
502
503 ret = service_operation(new_op, "orangefs_mount", 0);
504 gossip_debug(GOSSIP_SUPER_DEBUG,
505 "orangefs_mount: mount got return value of %d\n", ret);
506 if (ret)
507 goto free_op;
508
509 if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
510 gossip_err("ERROR: Retrieved null fs_id\n");
511 ret = -EINVAL;
512 goto free_op;
513 }
514
515 sb = sget(fst, NULL, set_anon_super, flags, NULL);
516
517 if (IS_ERR(sb)) {
518 d = ERR_CAST(sb);
519 orangefs_unmount(new_op->downcall.resp.fs_mount.id,
520 new_op->downcall.resp.fs_mount.fs_id, devname);
521 goto free_op;
522 }
523
524 ret = orangefs_fill_sb(sb,
525 &new_op->downcall.resp.fs_mount, data,
526 flags & MS_SILENT ? 1 : 0);
527
528 if (ret) {
529 d = ERR_PTR(ret);
530 goto free_sb_and_op;
531 }
532
533 /*
534 * on successful mount, store the devname and data
535 * used
536 */
537 strncpy(ORANGEFS_SB(sb)->devname,
538 devname,
539 ORANGEFS_MAX_SERVER_ADDR_LEN);
540
541 /* mount_pending must be cleared */
542 ORANGEFS_SB(sb)->mount_pending = 0;
543
544 /*
545 * finally, add this sb to our list of known orangefs
546 * sb's
547 */
548 gossip_debug(GOSSIP_SUPER_DEBUG,
549 "Adding SB %p to orangefs superblocks\n",
550 ORANGEFS_SB(sb));
551 spin_lock(&orangefs_superblocks_lock);
552 list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
553 spin_unlock(&orangefs_superblocks_lock);
554 op_release(new_op);
555
556 /* Must be removed from the list now. */
557 ORANGEFS_SB(sb)->no_list = 0;
558
559 if (orangefs_userspace_version >= 20906) {
560 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
561 if (!new_op)
562 return ERR_PTR(-ENOMEM);
563 new_op->upcall.req.features.features = 0;
564 ret = service_operation(new_op, "orangefs_features", 0);
565 orangefs_features = new_op->downcall.resp.features.features;
566 op_release(new_op);
567 } else {
568 orangefs_features = 0;
569 }
570
571 return dget(sb->s_root);
572
573 free_sb_and_op:
574 /* Will call orangefs_kill_sb with sb not in list. */
575 ORANGEFS_SB(sb)->no_list = 1;
576 /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */
577 deactivate_locked_super(sb);
578 free_op:
579 gossip_err("orangefs_mount: mount request failed with %d\n", ret);
580 if (ret == -EINVAL) {
581 gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
582 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
583 }
584
585 op_release(new_op);
586
587 return d;
588 }
589
590 void orangefs_kill_sb(struct super_block *sb)
591 {
592 int r;
593 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
594
595 /* provided sb cleanup */
596 kill_anon_super(sb);
597
598 /*
599 * issue the unmount to userspace to tell it to remove the
600 * dynamic mount info it has for this superblock
601 */
602 r = orangefs_unmount(ORANGEFS_SB(sb)->id, ORANGEFS_SB(sb)->fs_id,
603 ORANGEFS_SB(sb)->devname);
604 if (!r)
605 ORANGEFS_SB(sb)->mount_pending = 1;
606
607 if (!ORANGEFS_SB(sb)->no_list) {
608 /* remove the sb from our list of orangefs specific sb's */
609 spin_lock(&orangefs_superblocks_lock);
610 /* not list_del_init */
611 __list_del_entry(&ORANGEFS_SB(sb)->list);
612 ORANGEFS_SB(sb)->list.prev = NULL;
613 spin_unlock(&orangefs_superblocks_lock);
614 }
615
616 /*
617 * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
618 * gets completed before we free the dang thing.
619 */
620 mutex_lock(&orangefs_request_mutex);
621 mutex_unlock(&orangefs_request_mutex);
622
623 /* free the orangefs superblock private data */
624 kfree(ORANGEFS_SB(sb));
625 }
626
627 int orangefs_inode_cache_initialize(void)
628 {
629 orangefs_inode_cache = kmem_cache_create("orangefs_inode_cache",
630 sizeof(struct orangefs_inode_s),
631 0,
632 ORANGEFS_CACHE_CREATE_FLAGS,
633 orangefs_inode_cache_ctor);
634
635 if (!orangefs_inode_cache) {
636 gossip_err("Cannot create orangefs_inode_cache\n");
637 return -ENOMEM;
638 }
639 return 0;
640 }
641
642 int orangefs_inode_cache_finalize(void)
643 {
644 kmem_cache_destroy(orangefs_inode_cache);
645 return 0;
646 }