2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
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)
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * This file is part of exofs.
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.
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.
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
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>
44 #define EXOFS_DBGMSG2(M...) do {} while (0)
46 /******************************************************************************
48 *****************************************************************************/
51 * struct to hold what we get from mount options
53 struct exofs_mountopt {
61 * exofs-specific mount-time options.
63 enum { Opt_name, Opt_pid, Opt_to, Opt_err };
66 * Our mount-time options. These should ideally be 64-bit unsigned, but the
67 * kernel's parsing functions do not currently support that. 32-bit should be
68 * sufficient for most applications now.
70 static match_table_t tokens = {
71 {Opt_name, "osdname=%s"},
78 * The main option parsing method. Also makes sure that all of the mandatory
79 * mount options were set.
81 static int parse_options(char *options, struct exofs_mountopt *opts)
84 substring_t args[MAX_OPT_ARGS];
88 EXOFS_DBGMSG("parse_options %s\n", options);
90 memset(opts, 0, sizeof(*opts));
91 opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
93 while ((p = strsep(&options, ",")) != NULL) {
100 token = match_token(p, tokens, args);
103 opts->dev_name = match_strdup(&args[0]);
104 if (unlikely(!opts->dev_name)) {
105 EXOFS_ERR("Error allocating dev_name");
108 opts->is_osdname = true;
111 if (0 == match_strlcpy(str, &args[0], sizeof(str)))
113 opts->pid = simple_strtoull(str, NULL, 0);
114 if (opts->pid < EXOFS_MIN_PID) {
115 EXOFS_ERR("Partition ID must be >= %u",
122 if (match_int(&args[0], &option))
125 EXOFS_ERR("Timout must be > 0");
128 opts->timeout = option * HZ;
134 EXOFS_ERR("Need to specify the following options:\n");
135 EXOFS_ERR(" -o pid=pid_no_to_use\n");
142 /******************************************************************************
144 *****************************************************************************/
147 * Our inode cache. Isn't it pretty?
149 static struct kmem_cache *exofs_inode_cachep;
152 * Allocate an inode in the cache
154 static struct inode *exofs_alloc_inode(struct super_block *sb)
156 struct exofs_i_info *oi;
158 oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
162 oi->vfs_inode.i_version = 1;
163 return &oi->vfs_inode;
166 static void exofs_i_callback(struct rcu_head *head)
168 struct inode *inode = container_of(head, struct inode, i_rcu);
169 kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
173 * Remove an inode from the cache
175 static void exofs_destroy_inode(struct inode *inode)
177 call_rcu(&inode->i_rcu, exofs_i_callback);
181 * Initialize the inode
183 static void exofs_init_once(void *foo)
185 struct exofs_i_info *oi = foo;
187 inode_init_once(&oi->vfs_inode);
191 * Create and initialize the inode cache
193 static int init_inodecache(void)
195 exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
196 sizeof(struct exofs_i_info), 0,
197 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
199 if (exofs_inode_cachep == NULL)
205 * Destroy the inode cache
207 static void destroy_inodecache(void)
209 kmem_cache_destroy(exofs_inode_cachep);
212 /******************************************************************************
214 *****************************************************************************/
215 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
217 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
220 static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
221 u64 offset, void *p, unsigned length)
223 struct osd_request *or = osd_start_request(od, GFP_KERNEL);
224 /* struct osd_sense_info osi = {.key = 0};*/
228 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
231 ret = osd_req_read_kern(or, obj, offset, p, length);
233 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
237 ret = osd_finalize_request(or, 0, cred, NULL);
239 EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret);
243 ret = osd_execute_request(or);
245 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
246 /* osd_req_decode_sense(or, ret); */
250 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
251 "length=0x%llx dev=%p ret=>%d\n",
252 _LLU(obj->id), _LLU(offset), _LLU(length), od, ret);
256 static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
259 sizeof(struct exofs_sb_stats));
261 static int __sbi_read_stats(struct exofs_sb_info *sbi)
263 struct osd_attr attrs[] = {
264 [0] = g_attr_sb_stats,
266 struct ore_io_state *ios;
269 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
271 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
275 ios->in_attr = attrs;
276 ios->in_attr_len = ARRAY_SIZE(attrs);
280 EXOFS_ERR("Error reading super_block stats => %d\n", ret);
284 ret = extract_attr_from_ios(ios, &attrs[0]);
286 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
290 struct exofs_sb_stats *ess;
292 if (unlikely(attrs[0].len != sizeof(*ess))) {
293 EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
294 "size(%d) != expected(%zd)\n",
295 __func__, attrs[0].len, sizeof(*ess));
299 ess = attrs[0].val_ptr;
300 sbi->s_nextid = le64_to_cpu(ess->s_nextid);
301 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
305 ore_put_io_state(ios);
309 static void stats_done(struct ore_io_state *ios, void *p)
311 ore_put_io_state(ios);
312 /* Good thanks nothing to do anymore */
315 /* Asynchronously write the stats attribute */
316 int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
318 struct osd_attr attrs[] = {
319 [0] = g_attr_sb_stats,
321 struct ore_io_state *ios;
324 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
326 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
330 sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid);
331 sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
332 attrs[0].val_ptr = &sbi->s_ess;
335 ios->done = stats_done;
337 ios->out_attr = attrs;
338 ios->out_attr_len = ARRAY_SIZE(attrs);
340 ret = ore_write(ios);
342 EXOFS_ERR("%s: ore_write failed.\n", __func__);
343 ore_put_io_state(ios);
349 /******************************************************************************
350 * SUPERBLOCK FUNCTIONS
351 *****************************************************************************/
352 static const struct super_operations exofs_sops;
353 static const struct export_operations exofs_export_ops;
356 * Write the superblock to the OSD
358 static int exofs_sync_fs(struct super_block *sb, int wait)
360 struct exofs_sb_info *sbi;
361 struct exofs_fscb *fscb;
362 struct ore_comp one_comp;
363 struct ore_components oc;
364 struct ore_io_state *ios;
367 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
373 /* NOTE: We no longer dirty the super_block anywhere in exofs. The
374 * reason we write the fscb here on unmount is so we can stay backwards
375 * compatible with fscb->s_version == 1. (What we are not compatible
376 * with is if a new version FS crashed and then we try to mount an old
377 * version). Otherwise the exofs_fscb is read-only from mkfs time. All
378 * the writeable info is set in exofs_sbi_write_stats() above.
381 exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
383 ret = ore_get_io_state(&sbi->layout, &oc, &ios);
389 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
390 memset(fscb, 0, ios->length);
391 fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
392 fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
393 fscb->s_magic = cpu_to_le16(sb->s_magic);
395 fscb->s_version = EXOFS_FSCB_VER;
398 ios->kern_buff = fscb;
400 ret = ore_write(ios);
402 EXOFS_ERR("%s: ore_write failed.\n", __func__);
409 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
410 ore_put_io_state(ios);
415 static void exofs_write_super(struct super_block *sb)
417 if (!(sb->s_flags & MS_RDONLY))
418 exofs_sync_fs(sb, 1);
423 static void _exofs_print_device(const char *msg, const char *dev_path,
424 struct osd_dev *od, u64 pid)
426 const struct osd_dev_info *odi = osduld_device_info(od);
428 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
429 msg, dev_path ?: "", odi->osdname, _LLU(pid));
432 static void exofs_free_sbi(struct exofs_sb_info *sbi)
434 unsigned numdevs = sbi->oc.numdevs;
437 unsigned i = --numdevs;
438 struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
441 ore_comp_set_dev(&sbi->oc, i, NULL);
442 osduld_put_device(od);
450 * This function is called when the vfs is freeing the superblock. We just
451 * need to free our own part.
453 static void exofs_put_super(struct super_block *sb)
456 struct exofs_sb_info *sbi = sb->s_fs_info;
458 /* make sure there are no pending commands */
459 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
460 num_pend = atomic_read(&sbi->s_curr_pending)) {
461 wait_queue_head_t wq;
463 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
464 "This is a BUG. please report to osd-dev@open-osd.org\n",
466 init_waitqueue_head(&wq);
467 wait_event_timeout(wq,
468 (atomic_read(&sbi->s_curr_pending) == 0),
469 msecs_to_jiffies(100));
472 _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
473 sbi->one_comp.obj.partition);
475 bdi_destroy(&sbi->bdi);
477 sb->s_fs_info = NULL;
480 static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
481 struct exofs_device_table *dt)
485 sbi->layout.stripe_unit =
486 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
487 sbi->layout.group_width =
488 le32_to_cpu(dt->dt_data_map.cb_group_width);
489 sbi->layout.group_depth =
490 le32_to_cpu(dt->dt_data_map.cb_group_depth);
491 sbi->layout.mirrors_p1 =
492 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
493 sbi->layout.raid_algorithm =
494 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
496 ret = ore_verify_layout(numdevs, &sbi->layout);
498 EXOFS_DBGMSG("exofs: layout: "
499 "num_comps=%u stripe_unit=0x%x group_width=%u "
500 "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n",
502 sbi->layout.stripe_unit,
503 sbi->layout.group_width,
504 _LLU(sbi->layout.group_depth),
505 sbi->layout.mirrors_p1,
506 sbi->layout.raid_algorithm);
510 static unsigned __ra_pages(struct ore_layout *layout)
512 const unsigned _MIN_RA = 32; /* min 128K read-ahead */
513 unsigned ra_pages = layout->group_width * layout->stripe_unit /
515 unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
517 ra_pages *= 2; /* two stripes */
518 if (ra_pages < _MIN_RA)
519 ra_pages = roundup(_MIN_RA, ra_pages / 2);
521 if (ra_pages > max_io_pages)
522 ra_pages = max_io_pages;
527 /* @odi is valid only as long as @fscb_dev is valid */
528 static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
529 struct osd_dev_info *odi)
531 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
532 memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len);
534 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
535 odi->osdname = dt_dev->osdname;
537 /* FIXME support long names. Will need a _put function */
538 if (dt_dev->long_name_offset)
541 /* Make sure osdname is printable!
542 * mkexofs should give us space for a null-terminator else the
543 * device-table is invalid.
545 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
546 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
547 dt_dev->osdname[odi->osdname_len] = 0;
549 /* If it's all zeros something is bad we read past end-of-obj */
550 return !(odi->systemid_len || odi->osdname_len);
553 int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
554 struct exofs_dev **peds)
556 struct __alloc_ore_devs_and_exofs_devs {
557 /* Twice bigger table: See exofs_init_comps() and comment at
558 * exofs_read_lookup_dev_table()
560 struct ore_dev *oreds[numdevs * 2 - 1];
561 struct exofs_dev eds[numdevs];
563 struct exofs_dev *eds;
566 aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
567 if (unlikely(!aoded)) {
568 EXOFS_ERR("ERROR: faild allocating Device array[%d]\n",
573 sbi->oc.ods = aoded->oreds;
574 *peds = eds = aoded->eds;
575 for (i = 0; i < numdevs; ++i)
576 aoded->oreds[i] = &eds[i].ored;
580 static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
581 struct osd_dev *fscb_od,
582 unsigned table_count)
584 struct ore_comp comp;
585 struct exofs_device_table *dt;
586 struct exofs_dev *eds;
587 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
592 dt = kmalloc(table_bytes, GFP_KERNEL);
594 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
601 comp.obj.partition = sbi->one_comp.obj.partition;
602 comp.obj.id = EXOFS_DEVTABLE_ID;
603 exofs_make_credential(comp.cred, &comp.obj);
605 ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
608 EXOFS_ERR("ERROR: reading device table\n");
612 numdevs = le64_to_cpu(dt->dt_num_devices);
613 if (unlikely(!numdevs)) {
617 WARN_ON(table_count != numdevs);
619 ret = _read_and_match_data_map(sbi, numdevs, dt);
623 ret = __alloc_dev_table(sbi, numdevs, &eds);
626 /* exofs round-robins the device table view according to inode
627 * number. We hold a: twice bigger table hence inodes can point
628 * to any device and have a sequential view of the table
629 * starting at this device. See exofs_init_comps()
631 memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
632 (numdevs - 1) * sizeof(sbi->oc.ods[0]));
634 for (i = 0; i < numdevs; i++) {
635 struct exofs_fscb fscb;
636 struct osd_dev_info odi;
639 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
640 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
645 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
648 /* the exofs id is currently the table index */
651 /* On all devices the device table is identical. The user can
652 * specify any one of the participating devices on the command
653 * line. We always keep them in device-table order.
655 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
656 eds[i].ored.od = fscb_od;
662 od = osduld_info_lookup(&odi);
665 EXOFS_ERR("ERROR: device requested is not found "
666 "osd_name-%s =>%d\n", odi.osdname, ret);
673 /* Read the fscb of the other devices to make sure the FS
674 * partition is there.
676 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
679 EXOFS_ERR("ERROR: Malformed participating device "
680 "error reading fscb osd_name-%s\n",
685 /* TODO: verify other information is correct and FS-uuid
686 * matches. Benny what did you say about device table
687 * generation and old devices?
693 if (unlikely(fscb_od && !ret)) {
694 EXOFS_ERR("ERROR: Bad device-table container device not present\n");
695 osduld_put_device(fscb_od);
702 * Read the superblock from the OSD and fill in the fields
704 static int exofs_fill_super(struct super_block *sb, void *data, int silent)
707 struct exofs_mountopt *opts = data;
708 struct exofs_sb_info *sbi; /*extended info */
709 struct osd_dev *od; /* Master device */
710 struct exofs_fscb fscb; /*on-disk superblock info */
711 struct ore_comp comp;
712 unsigned table_count;
715 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
719 /* use mount options to fill superblock */
720 if (opts->is_osdname) {
721 struct osd_dev_info odi = {.systemid_len = 0};
723 odi.osdname_len = strlen(opts->dev_name);
724 odi.osdname = (u8 *)opts->dev_name;
725 od = osduld_info_lookup(&odi);
726 kfree(opts->dev_name);
727 opts->dev_name = NULL;
729 od = osduld_path_lookup(opts->dev_name);
736 /* Default layout in case we do not have a device-table */
737 sbi->layout.stripe_unit = PAGE_SIZE;
738 sbi->layout.mirrors_p1 = 1;
739 sbi->layout.group_width = 1;
740 sbi->layout.group_depth = -1;
741 sbi->layout.group_count = 1;
742 sbi->s_timeout = opts->timeout;
744 sbi->one_comp.obj.partition = opts->pid;
745 sbi->one_comp.obj.id = 0;
746 exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
748 sbi->oc.single_comp = EC_SINGLE_COMP;
749 sbi->oc.comps = &sbi->one_comp;
751 /* fill in some other data by hand */
752 memset(sb->s_id, 0, sizeof(sb->s_id));
753 strcpy(sb->s_id, "exofs");
754 sb->s_blocksize = EXOFS_BLKSIZE;
755 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
756 sb->s_maxbytes = MAX_LFS_FILESIZE;
757 atomic_set(&sbi->s_curr_pending, 0);
761 comp.obj.partition = sbi->one_comp.obj.partition;
762 comp.obj.id = EXOFS_SUPER_ID;
763 exofs_make_credential(comp.cred, &comp.obj);
765 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
769 sb->s_magic = le16_to_cpu(fscb.s_magic);
770 /* NOTE: we read below to be backward compatible with old versions */
771 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
772 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
774 /* make sure what we read from the object store is correct */
775 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
777 EXOFS_ERR("ERROR: Bad magic value\n");
781 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
782 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
783 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
788 /* start generation numbers from a random point */
789 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
790 spin_lock_init(&sbi->s_next_gen_lock);
792 table_count = le64_to_cpu(fscb.s_dev_table_count);
794 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
798 struct exofs_dev *eds;
800 ret = __alloc_dev_table(sbi, 1, &eds);
804 ore_comp_set_dev(&sbi->oc, 0, od);
807 __sbi_read_stats(sbi);
809 /* set up operation vectors */
810 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
811 sb->s_bdi = &sbi->bdi;
813 sb->s_op = &exofs_sops;
814 sb->s_export_op = &exofs_export_ops;
815 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
817 EXOFS_ERR("ERROR: exofs_iget failed\n");
821 sb->s_root = d_alloc_root(root);
824 EXOFS_ERR("ERROR: get root inode failed\n");
829 if (!S_ISDIR(root->i_mode)) {
832 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
838 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
840 EXOFS_DBGMSG("Failed to bdi_setup_and_register\n");
846 _exofs_print_device("Mounting", opts->dev_name,
847 ore_comp_dev(&sbi->oc, 0),
848 sbi->one_comp.obj.partition);
852 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
853 opts->dev_name, sbi->one_comp.obj.partition, ret);
859 * Set up the superblock (calls exofs_fill_super eventually)
861 static struct dentry *exofs_mount(struct file_system_type *type,
862 int flags, const char *dev_name,
865 struct exofs_mountopt opts;
868 ret = parse_options(data, &opts);
873 opts.dev_name = dev_name;
874 return mount_nodev(type, flags, &opts, exofs_fill_super);
878 * Return information about the file system state in the buffer. This is used
879 * by the 'df' command, for example.
881 static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
883 struct super_block *sb = dentry->d_sb;
884 struct exofs_sb_info *sbi = sb->s_fs_info;
885 struct ore_io_state *ios;
886 struct osd_attr attrs[] = {
887 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
888 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
889 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
890 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
892 uint64_t capacity = ULLONG_MAX;
893 uint64_t used = ULLONG_MAX;
896 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
898 EXOFS_DBGMSG("ore_get_io_state failed.\n");
902 ios->in_attr = attrs;
903 ios->in_attr_len = ARRAY_SIZE(attrs);
909 ret = extract_attr_from_ios(ios, &attrs[0]);
911 capacity = get_unaligned_be64(attrs[0].val_ptr);
912 if (unlikely(!capacity))
913 capacity = ULLONG_MAX;
915 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
917 ret = extract_attr_from_ios(ios, &attrs[1]);
919 used = get_unaligned_be64(attrs[1].val_ptr);
921 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
923 /* fill in the stats buffer */
924 buf->f_type = EXOFS_SUPER_MAGIC;
925 buf->f_bsize = EXOFS_BLKSIZE;
926 buf->f_blocks = capacity >> 9;
927 buf->f_bfree = (capacity - used) >> 9;
928 buf->f_bavail = buf->f_bfree;
929 buf->f_files = sbi->s_numfiles;
930 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
931 buf->f_namelen = EXOFS_NAME_LEN;
934 ore_put_io_state(ios);
938 static const struct super_operations exofs_sops = {
939 .alloc_inode = exofs_alloc_inode,
940 .destroy_inode = exofs_destroy_inode,
941 .write_inode = exofs_write_inode,
942 .evict_inode = exofs_evict_inode,
943 .put_super = exofs_put_super,
944 .write_super = exofs_write_super,
945 .sync_fs = exofs_sync_fs,
946 .statfs = exofs_statfs,
949 /******************************************************************************
951 *****************************************************************************/
953 static struct dentry *exofs_get_parent(struct dentry *child)
955 unsigned long ino = exofs_parent_ino(child);
958 return ERR_PTR(-ESTALE);
960 return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
963 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
964 u64 ino, u32 generation)
968 inode = exofs_iget(sb, ino);
970 return ERR_CAST(inode);
971 if (generation && inode->i_generation != generation) {
972 /* we didn't find the right inode.. */
974 return ERR_PTR(-ESTALE);
979 static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
980 struct fid *fid, int fh_len, int fh_type)
982 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
983 exofs_nfs_get_inode);
986 static struct dentry *exofs_fh_to_parent(struct super_block *sb,
987 struct fid *fid, int fh_len, int fh_type)
989 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
990 exofs_nfs_get_inode);
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,
999 /******************************************************************************
1001 *****************************************************************************/
1004 * struct that describes this file system
1006 static struct file_system_type exofs_type = {
1007 .owner = THIS_MODULE,
1009 .mount = exofs_mount,
1010 .kill_sb = generic_shutdown_super,
1013 static int __init init_exofs(void)
1017 err = init_inodecache();
1021 err = register_filesystem(&exofs_type);
1027 destroy_inodecache();
1032 static void __exit exit_exofs(void)
1034 unregister_filesystem(&exofs_type);
1035 destroy_inodecache();
1038 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1039 MODULE_DESCRIPTION("exofs");
1040 MODULE_LICENSE("GPL");
1042 module_init(init_exofs)
1043 module_exit(exit_exofs)