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