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Linux/fs/exofs/super.c

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  1 /*
  2  * Copyright (C) 2005, 2006
  3  * Avishay Traeger (avishay@gmail.com)
  4  * Copyright (C) 2008, 2009
  5  * Boaz Harrosh <ooo@electrozaur.com>
  6  *
  7  * Copyrights for code taken from ext2:
  8  *     Copyright (C) 1992, 1993, 1994, 1995
  9  *     Remy Card (card@masi.ibp.fr)
 10  *     Laboratoire MASI - Institut Blaise Pascal
 11  *     Universite Pierre et Marie Curie (Paris VI)
 12  *     from
 13  *     linux/fs/minix/inode.c
 14  *     Copyright (C) 1991, 1992  Linus Torvalds
 15  *
 16  * This file is part of exofs.
 17  *
 18  * exofs is free software; you can redistribute it and/or modify
 19  * it under the terms of the GNU General Public License as published by
 20  * the Free Software Foundation.  Since it is based on ext2, and the only
 21  * valid version of GPL for the Linux kernel is version 2, the only valid
 22  * version of GPL for exofs is version 2.
 23  *
 24  * exofs is distributed in the hope that it will be useful,
 25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 27  * GNU General Public License for more details.
 28  *
 29  * You should have received a copy of the GNU General Public License
 30  * along with exofs; if not, write to the Free Software
 31  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 32  */
 33 
 34 #include <linux/string.h>
 35 #include <linux/parser.h>
 36 #include <linux/vfs.h>
 37 #include <linux/random.h>
 38 #include <linux/module.h>
 39 #include <linux/exportfs.h>
 40 #include <linux/slab.h>
 41 #include <linux/iversion.h>
 42 
 43 #include "exofs.h"
 44 
 45 #define EXOFS_DBGMSG2(M...) do {} while (0)
 46 
 47 /******************************************************************************
 48  * MOUNT OPTIONS
 49  *****************************************************************************/
 50 
 51 /*
 52  * struct to hold what we get from mount options
 53  */
 54 struct exofs_mountopt {
 55         bool is_osdname;
 56         const char *dev_name;
 57         uint64_t pid;
 58         int timeout;
 59 };
 60 
 61 /*
 62  * exofs-specific mount-time options.
 63  */
 64 enum { Opt_name, Opt_pid, Opt_to, Opt_err };
 65 
 66 /*
 67  * Our mount-time options.  These should ideally be 64-bit unsigned, but the
 68  * kernel's parsing functions do not currently support that.  32-bit should be
 69  * sufficient for most applications now.
 70  */
 71 static match_table_t tokens = {
 72         {Opt_name, "osdname=%s"},
 73         {Opt_pid, "pid=%u"},
 74         {Opt_to, "to=%u"},
 75         {Opt_err, NULL}
 76 };
 77 
 78 /*
 79  * The main option parsing method.  Also makes sure that all of the mandatory
 80  * mount options were set.
 81  */
 82 static int parse_options(char *options, struct exofs_mountopt *opts)
 83 {
 84         char *p;
 85         substring_t args[MAX_OPT_ARGS];
 86         int option;
 87         bool s_pid = false;
 88 
 89         EXOFS_DBGMSG("parse_options %s\n", options);
 90         /* defaults */
 91         memset(opts, 0, sizeof(*opts));
 92         opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
 93 
 94         while ((p = strsep(&options, ",")) != NULL) {
 95                 int token;
 96                 char str[32];
 97 
 98                 if (!*p)
 99                         continue;
100 
101                 token = match_token(p, tokens, args);
102                 switch (token) {
103                 case Opt_name:
104                         opts->dev_name = match_strdup(&args[0]);
105                         if (unlikely(!opts->dev_name)) {
106                                 EXOFS_ERR("Error allocating dev_name");
107                                 return -ENOMEM;
108                         }
109                         opts->is_osdname = true;
110                         break;
111                 case Opt_pid:
112                         if (0 == match_strlcpy(str, &args[0], sizeof(str)))
113                                 return -EINVAL;
114                         opts->pid = simple_strtoull(str, NULL, 0);
115                         if (opts->pid < EXOFS_MIN_PID) {
116                                 EXOFS_ERR("Partition ID must be >= %u",
117                                           EXOFS_MIN_PID);
118                                 return -EINVAL;
119                         }
120                         s_pid = 1;
121                         break;
122                 case Opt_to:
123                         if (match_int(&args[0], &option))
124                                 return -EINVAL;
125                         if (option <= 0) {
126                                 EXOFS_ERR("Timeout must be > 0");
127                                 return -EINVAL;
128                         }
129                         opts->timeout = option * HZ;
130                         break;
131                 }
132         }
133 
134         if (!s_pid) {
135                 EXOFS_ERR("Need to specify the following options:\n");
136                 EXOFS_ERR("    -o pid=pid_no_to_use\n");
137                 return -EINVAL;
138         }
139 
140         return 0;
141 }
142 
143 /******************************************************************************
144  * INODE CACHE
145  *****************************************************************************/
146 
147 /*
148  * Our inode cache.  Isn't it pretty?
149  */
150 static struct kmem_cache *exofs_inode_cachep;
151 
152 /*
153  * Allocate an inode in the cache
154  */
155 static struct inode *exofs_alloc_inode(struct super_block *sb)
156 {
157         struct exofs_i_info *oi;
158 
159         oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
160         if (!oi)
161                 return NULL;
162 
163         inode_set_iversion(&oi->vfs_inode, 1);
164         return &oi->vfs_inode;
165 }
166 
167 static void exofs_i_callback(struct rcu_head *head)
168 {
169         struct inode *inode = container_of(head, struct inode, i_rcu);
170         kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
171 }
172 
173 /*
174  * Remove an inode from the cache
175  */
176 static void exofs_destroy_inode(struct inode *inode)
177 {
178         call_rcu(&inode->i_rcu, exofs_i_callback);
179 }
180 
181 /*
182  * Initialize the inode
183  */
184 static void exofs_init_once(void *foo)
185 {
186         struct exofs_i_info *oi = foo;
187 
188         inode_init_once(&oi->vfs_inode);
189 }
190 
191 /*
192  * Create and initialize the inode cache
193  */
194 static int init_inodecache(void)
195 {
196         exofs_inode_cachep = kmem_cache_create_usercopy("exofs_inode_cache",
197                                 sizeof(struct exofs_i_info), 0,
198                                 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD |
199                                 SLAB_ACCOUNT,
200                                 offsetof(struct exofs_i_info, i_data),
201                                 sizeof_field(struct exofs_i_info, i_data),
202                                 exofs_init_once);
203         if (exofs_inode_cachep == NULL)
204                 return -ENOMEM;
205         return 0;
206 }
207 
208 /*
209  * Destroy the inode cache
210  */
211 static void destroy_inodecache(void)
212 {
213         /*
214          * Make sure all delayed rcu free inodes are flushed before we
215          * destroy cache.
216          */
217         rcu_barrier();
218         kmem_cache_destroy(exofs_inode_cachep);
219 }
220 
221 /******************************************************************************
222  * Some osd helpers
223  *****************************************************************************/
224 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
225 {
226         osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
227 }
228 
229 static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
230                     u64 offset, void *p, unsigned length)
231 {
232         struct osd_request *or = osd_start_request(od, GFP_KERNEL);
233 /*      struct osd_sense_info osi = {.key = 0};*/
234         int ret;
235 
236         if (unlikely(!or)) {
237                 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
238                 return -ENOMEM;
239         }
240         ret = osd_req_read_kern(or, obj, offset, p, length);
241         if (unlikely(ret)) {
242                 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
243                 goto out;
244         }
245 
246         ret = osd_finalize_request(or, 0, cred, NULL);
247         if (unlikely(ret)) {
248                 EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret);
249                 goto out;
250         }
251 
252         ret = osd_execute_request(or);
253         if (unlikely(ret))
254                 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
255         /* osd_req_decode_sense(or, ret); */
256 
257 out:
258         osd_end_request(or);
259         EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
260                       "length=0x%llx dev=%p ret=>%d\n",
261                       _LLU(obj->id), _LLU(offset), _LLU(length), od, ret);
262         return ret;
263 }
264 
265 static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
266         EXOFS_APAGE_SB_DATA,
267         EXOFS_ATTR_SB_STATS,
268         sizeof(struct exofs_sb_stats));
269 
270 static int __sbi_read_stats(struct exofs_sb_info *sbi)
271 {
272         struct osd_attr attrs[] = {
273                 [0] = g_attr_sb_stats,
274         };
275         struct ore_io_state *ios;
276         int ret;
277 
278         ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
279         if (unlikely(ret)) {
280                 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
281                 return ret;
282         }
283 
284         ios->in_attr = attrs;
285         ios->in_attr_len = ARRAY_SIZE(attrs);
286 
287         ret = ore_read(ios);
288         if (unlikely(ret)) {
289                 EXOFS_ERR("Error reading super_block stats => %d\n", ret);
290                 goto out;
291         }
292 
293         ret = extract_attr_from_ios(ios, &attrs[0]);
294         if (ret) {
295                 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
296                 goto out;
297         }
298         if (attrs[0].len) {
299                 struct exofs_sb_stats *ess;
300 
301                 if (unlikely(attrs[0].len != sizeof(*ess))) {
302                         EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
303                                   "size(%d) != expected(%zd)\n",
304                                   __func__, attrs[0].len, sizeof(*ess));
305                         goto out;
306                 }
307 
308                 ess = attrs[0].val_ptr;
309                 sbi->s_nextid = le64_to_cpu(ess->s_nextid);
310                 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
311         }
312 
313 out:
314         ore_put_io_state(ios);
315         return ret;
316 }
317 
318 static void stats_done(struct ore_io_state *ios, void *p)
319 {
320         ore_put_io_state(ios);
321         /* Good thanks nothing to do anymore */
322 }
323 
324 /* Asynchronously write the stats attribute */
325 int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
326 {
327         struct osd_attr attrs[] = {
328                 [0] = g_attr_sb_stats,
329         };
330         struct ore_io_state *ios;
331         int ret;
332 
333         ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
334         if (unlikely(ret)) {
335                 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
336                 return ret;
337         }
338 
339         sbi->s_ess.s_nextid   = cpu_to_le64(sbi->s_nextid);
340         sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
341         attrs[0].val_ptr = &sbi->s_ess;
342 
343 
344         ios->done = stats_done;
345         ios->private = sbi;
346         ios->out_attr = attrs;
347         ios->out_attr_len = ARRAY_SIZE(attrs);
348 
349         ret = ore_write(ios);
350         if (unlikely(ret)) {
351                 EXOFS_ERR("%s: ore_write failed.\n", __func__);
352                 ore_put_io_state(ios);
353         }
354 
355         return ret;
356 }
357 
358 /******************************************************************************
359  * SUPERBLOCK FUNCTIONS
360  *****************************************************************************/
361 static const struct super_operations exofs_sops;
362 static const struct export_operations exofs_export_ops;
363 
364 /*
365  * Write the superblock to the OSD
366  */
367 static int exofs_sync_fs(struct super_block *sb, int wait)
368 {
369         struct exofs_sb_info *sbi;
370         struct exofs_fscb *fscb;
371         struct ore_comp one_comp;
372         struct ore_components oc;
373         struct ore_io_state *ios;
374         int ret = -ENOMEM;
375 
376         fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
377         if (unlikely(!fscb))
378                 return -ENOMEM;
379 
380         sbi = sb->s_fs_info;
381 
382         /* NOTE: We no longer dirty the super_block anywhere in exofs. The
383          * reason we write the fscb here on unmount is so we can stay backwards
384          * compatible with fscb->s_version == 1. (What we are not compatible
385          * with is if a new version FS crashed and then we try to mount an old
386          * version). Otherwise the exofs_fscb is read-only from mkfs time. All
387          * the writeable info is set in exofs_sbi_write_stats() above.
388          */
389 
390         exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
391 
392         ret = ore_get_io_state(&sbi->layout, &oc, &ios);
393         if (unlikely(ret))
394                 goto out;
395 
396         ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
397         memset(fscb, 0, ios->length);
398         fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
399         fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles);
400         fscb->s_magic = cpu_to_le16(sb->s_magic);
401         fscb->s_newfs = 0;
402         fscb->s_version = EXOFS_FSCB_VER;
403 
404         ios->offset = 0;
405         ios->kern_buff = fscb;
406 
407         ret = ore_write(ios);
408         if (unlikely(ret))
409                 EXOFS_ERR("%s: ore_write failed.\n", __func__);
410 
411 out:
412         EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
413         ore_put_io_state(ios);
414         kfree(fscb);
415         return ret;
416 }
417 
418 static void _exofs_print_device(const char *msg, const char *dev_path,
419                                 struct osd_dev *od, u64 pid)
420 {
421         const struct osd_dev_info *odi = osduld_device_info(od);
422 
423         printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
424                 msg, dev_path ?: "", odi->osdname, _LLU(pid));
425 }
426 
427 static void exofs_free_sbi(struct exofs_sb_info *sbi)
428 {
429         unsigned numdevs = sbi->oc.numdevs;
430 
431         while (numdevs) {
432                 unsigned i = --numdevs;
433                 struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
434 
435                 if (od) {
436                         ore_comp_set_dev(&sbi->oc, i, NULL);
437                         osduld_put_device(od);
438                 }
439         }
440         kfree(sbi->oc.ods);
441         kfree(sbi);
442 }
443 
444 /*
445  * This function is called when the vfs is freeing the superblock.  We just
446  * need to free our own part.
447  */
448 static void exofs_put_super(struct super_block *sb)
449 {
450         int num_pend;
451         struct exofs_sb_info *sbi = sb->s_fs_info;
452 
453         /* make sure there are no pending commands */
454         for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
455              num_pend = atomic_read(&sbi->s_curr_pending)) {
456                 wait_queue_head_t wq;
457 
458                 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
459                        "This is a BUG. please report to osd-dev@open-osd.org\n",
460                        __func__);
461                 init_waitqueue_head(&wq);
462                 wait_event_timeout(wq,
463                                   (atomic_read(&sbi->s_curr_pending) == 0),
464                                   msecs_to_jiffies(100));
465         }
466 
467         _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
468                             sbi->one_comp.obj.partition);
469 
470         exofs_sysfs_sb_del(sbi);
471         exofs_free_sbi(sbi);
472         sb->s_fs_info = NULL;
473 }
474 
475 static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
476                                     struct exofs_device_table *dt)
477 {
478         int ret;
479 
480         sbi->layout.stripe_unit =
481                                 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
482         sbi->layout.group_width =
483                                 le32_to_cpu(dt->dt_data_map.cb_group_width);
484         sbi->layout.group_depth =
485                                 le32_to_cpu(dt->dt_data_map.cb_group_depth);
486         sbi->layout.mirrors_p1  =
487                                 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
488         sbi->layout.raid_algorithm  =
489                                 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
490 
491         ret = ore_verify_layout(numdevs, &sbi->layout);
492 
493         EXOFS_DBGMSG("exofs: layout: "
494                 "num_comps=%u stripe_unit=0x%x group_width=%u "
495                 "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n",
496                 numdevs,
497                 sbi->layout.stripe_unit,
498                 sbi->layout.group_width,
499                 _LLU(sbi->layout.group_depth),
500                 sbi->layout.mirrors_p1,
501                 sbi->layout.raid_algorithm);
502         return ret;
503 }
504 
505 static unsigned __ra_pages(struct ore_layout *layout)
506 {
507         const unsigned _MIN_RA = 32; /* min 128K read-ahead */
508         unsigned ra_pages = layout->group_width * layout->stripe_unit /
509                                 PAGE_SIZE;
510         unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
511 
512         ra_pages *= 2; /* two stripes */
513         if (ra_pages < _MIN_RA)
514                 ra_pages = roundup(_MIN_RA, ra_pages / 2);
515 
516         if (ra_pages > max_io_pages)
517                 ra_pages = max_io_pages;
518 
519         return ra_pages;
520 }
521 
522 /* @odi is valid only as long as @fscb_dev is valid */
523 static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
524                              struct osd_dev_info *odi)
525 {
526         odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
527         if (likely(odi->systemid_len))
528                 memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN);
529 
530         odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
531         odi->osdname = dt_dev->osdname;
532 
533         /* FIXME support long names. Will need a _put function */
534         if (dt_dev->long_name_offset)
535                 return -EINVAL;
536 
537         /* Make sure osdname is printable!
538          * mkexofs should give us space for a null-terminator else the
539          * device-table is invalid.
540          */
541         if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
542                 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
543         dt_dev->osdname[odi->osdname_len] = 0;
544 
545         /* If it's all zeros something is bad we read past end-of-obj */
546         return !(odi->systemid_len || odi->osdname_len);
547 }
548 
549 static int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
550                       struct exofs_dev **peds)
551 {
552         struct __alloc_ore_devs_and_exofs_devs {
553                 /* Twice bigger table: See exofs_init_comps() and comment at
554                  * exofs_read_lookup_dev_table()
555                  */
556                 struct ore_dev *oreds[numdevs * 2 - 1];
557                 struct exofs_dev eds[numdevs];
558         } *aoded;
559         struct exofs_dev *eds;
560         unsigned i;
561 
562         aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
563         if (unlikely(!aoded)) {
564                 EXOFS_ERR("ERROR: failed allocating Device array[%d]\n",
565                           numdevs);
566                 return -ENOMEM;
567         }
568 
569         sbi->oc.ods = aoded->oreds;
570         *peds = eds = aoded->eds;
571         for (i = 0; i < numdevs; ++i)
572                 aoded->oreds[i] = &eds[i].ored;
573         return 0;
574 }
575 
576 static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
577                                        struct osd_dev *fscb_od,
578                                        unsigned table_count)
579 {
580         struct ore_comp comp;
581         struct exofs_device_table *dt;
582         struct exofs_dev *eds;
583         unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
584                                              sizeof(*dt);
585         unsigned numdevs, i;
586         int ret;
587 
588         dt = kmalloc(table_bytes, GFP_KERNEL);
589         if (unlikely(!dt)) {
590                 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
591                           table_bytes);
592                 return -ENOMEM;
593         }
594 
595         sbi->oc.numdevs = 0;
596 
597         comp.obj.partition = sbi->one_comp.obj.partition;
598         comp.obj.id = EXOFS_DEVTABLE_ID;
599         exofs_make_credential(comp.cred, &comp.obj);
600 
601         ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
602                               table_bytes);
603         if (unlikely(ret)) {
604                 EXOFS_ERR("ERROR: reading device table\n");
605                 goto out;
606         }
607 
608         numdevs = le64_to_cpu(dt->dt_num_devices);
609         if (unlikely(!numdevs)) {
610                 ret = -EINVAL;
611                 goto out;
612         }
613         WARN_ON(table_count != numdevs);
614 
615         ret = _read_and_match_data_map(sbi, numdevs, dt);
616         if (unlikely(ret))
617                 goto out;
618 
619         ret = __alloc_dev_table(sbi, numdevs, &eds);
620         if (unlikely(ret))
621                 goto out;
622         /* exofs round-robins the device table view according to inode
623          * number. We hold a: twice bigger table hence inodes can point
624          * to any device and have a sequential view of the table
625          * starting at this device. See exofs_init_comps()
626          */
627         memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
628                 (numdevs - 1) * sizeof(sbi->oc.ods[0]));
629 
630         /* create sysfs subdir under which we put the device table
631          * And cluster layout. A Superblock is identified by the string:
632          *      "dev[0].osdname"_"pid"
633          */
634         exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]);
635 
636         for (i = 0; i < numdevs; i++) {
637                 struct exofs_fscb fscb;
638                 struct osd_dev_info odi;
639                 struct osd_dev *od;
640 
641                 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
642                         EXOFS_ERR("ERROR: Read all-zeros device entry\n");
643                         ret = -EINVAL;
644                         goto out;
645                 }
646 
647                 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
648                        i, odi.osdname);
649 
650                 /* the exofs id is currently the table index */
651                 eds[i].did = i;
652 
653                 /* On all devices the device table is identical. The user can
654                  * specify any one of the participating devices on the command
655                  * line. We always keep them in device-table order.
656                  */
657                 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
658                         eds[i].ored.od = fscb_od;
659                         ++sbi->oc.numdevs;
660                         fscb_od = NULL;
661                         exofs_sysfs_odev_add(&eds[i], sbi);
662                         continue;
663                 }
664 
665                 od = osduld_info_lookup(&odi);
666                 if (IS_ERR(od)) {
667                         ret = PTR_ERR(od);
668                         EXOFS_ERR("ERROR: device requested is not found "
669                                   "osd_name-%s =>%d\n", odi.osdname, ret);
670                         goto out;
671                 }
672 
673                 eds[i].ored.od = od;
674                 ++sbi->oc.numdevs;
675 
676                 /* Read the fscb of the other devices to make sure the FS
677                  * partition is there.
678                  */
679                 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
680                                       sizeof(fscb));
681                 if (unlikely(ret)) {
682                         EXOFS_ERR("ERROR: Malformed participating device "
683                                   "error reading fscb osd_name-%s\n",
684                                   odi.osdname);
685                         goto out;
686                 }
687                 exofs_sysfs_odev_add(&eds[i], sbi);
688 
689                 /* TODO: verify other information is correct and FS-uuid
690                  *       matches. Benny what did you say about device table
691                  *       generation and old devices?
692                  */
693         }
694 
695 out:
696         kfree(dt);
697         if (unlikely(fscb_od && !ret)) {
698                         EXOFS_ERR("ERROR: Bad device-table container device not present\n");
699                         osduld_put_device(fscb_od);
700                         return -EINVAL;
701         }
702         return ret;
703 }
704 
705 /*
706  * Read the superblock from the OSD and fill in the fields
707  */
708 static int exofs_fill_super(struct super_block *sb, void *data, int silent)
709 {
710         struct inode *root;
711         struct exofs_mountopt *opts = data;
712         struct exofs_sb_info *sbi;      /*extended info                  */
713         struct osd_dev *od;             /* Master device                 */
714         struct exofs_fscb fscb;         /*on-disk superblock info        */
715         struct ore_comp comp;
716         unsigned table_count;
717         int ret;
718 
719         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
720         if (!sbi)
721                 return -ENOMEM;
722 
723         /* use mount options to fill superblock */
724         if (opts->is_osdname) {
725                 struct osd_dev_info odi = {.systemid_len = 0};
726 
727                 odi.osdname_len = strlen(opts->dev_name);
728                 odi.osdname = (u8 *)opts->dev_name;
729                 od = osduld_info_lookup(&odi);
730                 kfree(opts->dev_name);
731                 opts->dev_name = NULL;
732         } else {
733                 od = osduld_path_lookup(opts->dev_name);
734         }
735         if (IS_ERR(od)) {
736                 ret = -EINVAL;
737                 goto free_sbi;
738         }
739 
740         /* Default layout in case we do not have a device-table */
741         sbi->layout.stripe_unit = PAGE_SIZE;
742         sbi->layout.mirrors_p1 = 1;
743         sbi->layout.group_width = 1;
744         sbi->layout.group_depth = -1;
745         sbi->layout.group_count = 1;
746         sbi->s_timeout = opts->timeout;
747 
748         sbi->one_comp.obj.partition = opts->pid;
749         sbi->one_comp.obj.id = 0;
750         exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
751         sbi->oc.single_comp = EC_SINGLE_COMP;
752         sbi->oc.comps = &sbi->one_comp;
753 
754         /* fill in some other data by hand */
755         memset(sb->s_id, 0, sizeof(sb->s_id));
756         strcpy(sb->s_id, "exofs");
757         sb->s_blocksize = EXOFS_BLKSIZE;
758         sb->s_blocksize_bits = EXOFS_BLKSHIFT;
759         sb->s_maxbytes = MAX_LFS_FILESIZE;
760         sb->s_max_links = EXOFS_LINK_MAX;
761         atomic_set(&sbi->s_curr_pending, 0);
762         sb->s_bdev = NULL;
763         sb->s_dev = 0;
764 
765         comp.obj.partition = sbi->one_comp.obj.partition;
766         comp.obj.id = EXOFS_SUPER_ID;
767         exofs_make_credential(comp.cred, &comp.obj);
768 
769         ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
770         if (unlikely(ret))
771                 goto free_sbi;
772 
773         sb->s_magic = le16_to_cpu(fscb.s_magic);
774         /* NOTE: we read below to be backward compatible with old versions */
775         sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
776         sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
777 
778         /* make sure what we read from the object store is correct */
779         if (sb->s_magic != EXOFS_SUPER_MAGIC) {
780                 if (!silent)
781                         EXOFS_ERR("ERROR: Bad magic value\n");
782                 ret = -EINVAL;
783                 goto free_sbi;
784         }
785         if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
786                 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
787                           EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
788                 ret = -EINVAL;
789                 goto free_sbi;
790         }
791 
792         /* start generation numbers from a random point */
793         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
794         spin_lock_init(&sbi->s_next_gen_lock);
795 
796         table_count = le64_to_cpu(fscb.s_dev_table_count);
797         if (table_count) {
798                 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
799                 if (unlikely(ret))
800                         goto free_sbi;
801         } else {
802                 struct exofs_dev *eds;
803 
804                 ret = __alloc_dev_table(sbi, 1, &eds);
805                 if (unlikely(ret))
806                         goto free_sbi;
807 
808                 ore_comp_set_dev(&sbi->oc, 0, od);
809                 sbi->oc.numdevs = 1;
810         }
811 
812         __sbi_read_stats(sbi);
813 
814         /* set up operation vectors */
815         ret = super_setup_bdi(sb);
816         if (ret) {
817                 EXOFS_DBGMSG("Failed to super_setup_bdi\n");
818                 goto free_sbi;
819         }
820         sb->s_bdi->ra_pages = __ra_pages(&sbi->layout);
821         sb->s_fs_info = sbi;
822         sb->s_op = &exofs_sops;
823         sb->s_export_op = &exofs_export_ops;
824         root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
825         if (IS_ERR(root)) {
826                 EXOFS_ERR("ERROR: exofs_iget failed\n");
827                 ret = PTR_ERR(root);
828                 goto free_sbi;
829         }
830         sb->s_root = d_make_root(root);
831         if (!sb->s_root) {
832                 EXOFS_ERR("ERROR: get root inode failed\n");
833                 ret = -ENOMEM;
834                 goto free_sbi;
835         }
836 
837         if (!S_ISDIR(root->i_mode)) {
838                 dput(sb->s_root);
839                 sb->s_root = NULL;
840                 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
841                        root->i_mode);
842                 ret = -EINVAL;
843                 goto free_sbi;
844         }
845 
846         exofs_sysfs_dbg_print();
847         _exofs_print_device("Mounting", opts->dev_name,
848                             ore_comp_dev(&sbi->oc, 0),
849                             sbi->one_comp.obj.partition);
850         return 0;
851 
852 free_sbi:
853         EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
854                   opts->dev_name, sbi->one_comp.obj.partition, ret);
855         exofs_free_sbi(sbi);
856         return ret;
857 }
858 
859 /*
860  * Set up the superblock (calls exofs_fill_super eventually)
861  */
862 static struct dentry *exofs_mount(struct file_system_type *type,
863                           int flags, const char *dev_name,
864                           void *data)
865 {
866         struct exofs_mountopt opts;
867         int ret;
868 
869         ret = parse_options(data, &opts);
870         if (ret)
871                 return ERR_PTR(ret);
872 
873         if (!opts.dev_name)
874                 opts.dev_name = dev_name;
875         return mount_nodev(type, flags, &opts, exofs_fill_super);
876 }
877 
878 /*
879  * Return information about the file system state in the buffer.  This is used
880  * by the 'df' command, for example.
881  */
882 static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
883 {
884         struct super_block *sb = dentry->d_sb;
885         struct exofs_sb_info *sbi = sb->s_fs_info;
886         struct ore_io_state *ios;
887         struct osd_attr attrs[] = {
888                 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
889                         OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
890                 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
891                         OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
892         };
893         uint64_t capacity = ULLONG_MAX;
894         uint64_t used = ULLONG_MAX;
895         int ret;
896 
897         ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
898         if (ret) {
899                 EXOFS_DBGMSG("ore_get_io_state failed.\n");
900                 return ret;
901         }
902 
903         ios->in_attr = attrs;
904         ios->in_attr_len = ARRAY_SIZE(attrs);
905 
906         ret = ore_read(ios);
907         if (unlikely(ret))
908                 goto out;
909 
910         ret = extract_attr_from_ios(ios, &attrs[0]);
911         if (likely(!ret)) {
912                 capacity = get_unaligned_be64(attrs[0].val_ptr);
913                 if (unlikely(!capacity))
914                         capacity = ULLONG_MAX;
915         } else
916                 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
917 
918         ret = extract_attr_from_ios(ios, &attrs[1]);
919         if (likely(!ret))
920                 used = get_unaligned_be64(attrs[1].val_ptr);
921         else
922                 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
923 
924         /* fill in the stats buffer */
925         buf->f_type = EXOFS_SUPER_MAGIC;
926         buf->f_bsize = EXOFS_BLKSIZE;
927         buf->f_blocks = capacity >> 9;
928         buf->f_bfree = (capacity - used) >> 9;
929         buf->f_bavail = buf->f_bfree;
930         buf->f_files = sbi->s_numfiles;
931         buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
932         buf->f_namelen = EXOFS_NAME_LEN;
933 
934 out:
935         ore_put_io_state(ios);
936         return ret;
937 }
938 
939 static const struct super_operations exofs_sops = {
940         .alloc_inode    = exofs_alloc_inode,
941         .destroy_inode  = exofs_destroy_inode,
942         .write_inode    = exofs_write_inode,
943         .evict_inode    = exofs_evict_inode,
944         .put_super      = exofs_put_super,
945         .sync_fs        = exofs_sync_fs,
946         .statfs         = exofs_statfs,
947 };
948 
949 /******************************************************************************
950  * EXPORT OPERATIONS
951  *****************************************************************************/
952 
953 static struct dentry *exofs_get_parent(struct dentry *child)
954 {
955         unsigned long ino = exofs_parent_ino(child);
956 
957         if (!ino)
958                 return ERR_PTR(-ESTALE);
959 
960         return d_obtain_alias(exofs_iget(child->d_sb, ino));
961 }
962 
963 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
964                 u64 ino, u32 generation)
965 {
966         struct inode *inode;
967 
968         inode = exofs_iget(sb, ino);
969         if (IS_ERR(inode))
970                 return ERR_CAST(inode);
971         if (generation && inode->i_generation != generation) {
972                 /* we didn't find the right inode.. */
973                 iput(inode);
974                 return ERR_PTR(-ESTALE);
975         }
976         return inode;
977 }
978 
979 static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
980                                 struct fid *fid, int fh_len, int fh_type)
981 {
982         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
983                                     exofs_nfs_get_inode);
984 }
985 
986 static struct dentry *exofs_fh_to_parent(struct super_block *sb,
987                                 struct fid *fid, int fh_len, int fh_type)
988 {
989         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
990                                     exofs_nfs_get_inode);
991 }
992 
993 static const struct export_operations exofs_export_ops = {
994         .fh_to_dentry = exofs_fh_to_dentry,
995         .fh_to_parent = exofs_fh_to_parent,
996         .get_parent = exofs_get_parent,
997 };
998 
999 /******************************************************************************
1000  * INSMOD/RMMOD
1001  *****************************************************************************/
1002 
1003 /*
1004  * struct that describes this file system
1005  */
1006 static struct file_system_type exofs_type = {
1007         .owner          = THIS_MODULE,
1008         .name           = "exofs",
1009         .mount          = exofs_mount,
1010         .kill_sb        = generic_shutdown_super,
1011 };
1012 MODULE_ALIAS_FS("exofs");
1013 
1014 static int __init init_exofs(void)
1015 {
1016         int err;
1017 
1018         err = init_inodecache();
1019         if (err)
1020                 goto out;
1021 
1022         err = register_filesystem(&exofs_type);
1023         if (err)
1024                 goto out_d;
1025 
1026         /* We don't fail if sysfs creation failed */
1027         exofs_sysfs_init();
1028 
1029         return 0;
1030 out_d:
1031         destroy_inodecache();
1032 out:
1033         return err;
1034 }
1035 
1036 static void __exit exit_exofs(void)
1037 {
1038         exofs_sysfs_uninit();
1039         unregister_filesystem(&exofs_type);
1040         destroy_inodecache();
1041 }
1042 
1043 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1044 MODULE_DESCRIPTION("exofs");
1045 MODULE_LICENSE("GPL");
1046 
1047 module_init(init_exofs)
1048 module_exit(exit_exofs)
1049 

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