2 #include "ceph_debug.h"
4 #include <linux/backing-dev.h>
6 #include <linux/inet.h>
8 #include <linux/module.h>
9 #include <linux/mount.h>
10 #include <linux/parser.h>
11 #include <linux/sched.h>
12 #include <linux/seq_file.h>
13 #include <linux/slab.h>
14 #include <linux/statfs.h>
15 #include <linux/string.h>
19 #include "mon_client.h"
23 * Ceph superblock operations
25 * Handle the basics of mounting, unmounting.
30 * find filename portion of a path (/foo/bar/baz -> baz)
32 const char *ceph_file_part(const char *s, int len)
34 const char *e = s + len;
36 while (e != s && *(e-1) != '/')
45 static void ceph_put_super(struct super_block *s)
47 struct ceph_client *client = ceph_sb_to_client(s);
50 ceph_mdsc_close_sessions(&client->mdsc);
53 * ensure we release the bdi before put_anon_super releases
56 if (s->s_bdi == &client->backing_dev_info) {
57 bdi_unregister(&client->backing_dev_info);
64 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
66 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
67 struct ceph_monmap *monmap = client->monc.monmap;
68 struct ceph_statfs st;
73 err = ceph_monc_do_statfs(&client->monc, &st);
78 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
81 * express utilization in terms of large blocks to avoid
82 * overflow on 32-bit machines.
84 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
85 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
86 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
87 (CEPH_BLOCK_SHIFT-10);
88 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
90 buf->f_files = le64_to_cpu(st.num_objects);
92 buf->f_namelen = PATH_MAX;
93 buf->f_frsize = PAGE_CACHE_SIZE;
95 /* leave fsid little-endian, regardless of host endianness */
96 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
97 buf->f_fsid.val[0] = fsid & 0xffffffff;
98 buf->f_fsid.val[1] = fsid >> 32;
104 static int ceph_syncfs(struct super_block *sb, int wait)
106 dout("sync_fs %d\n", wait);
107 ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc);
108 ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc);
109 dout("sync_fs %d done\n", wait);
113 static int default_congestion_kb(void)
120 * congestion size, scale with available memory.
132 * This allows larger machines to have larger/more transfers.
133 * Limit the default to 256M
135 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
136 if (congestion_kb > 256*1024)
137 congestion_kb = 256*1024;
139 return congestion_kb;
143 * ceph_show_options - Show mount options in /proc/mounts
144 * @m: seq_file to write to
145 * @mnt: mount descriptor
147 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
149 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
150 struct ceph_mount_args *args = client->mount_args;
152 if (args->flags & CEPH_OPT_FSID)
153 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
154 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
155 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
156 if (args->flags & CEPH_OPT_NOSHARE)
157 seq_puts(m, ",noshare");
158 if (args->flags & CEPH_OPT_DIRSTAT)
159 seq_puts(m, ",dirstat");
160 if ((args->flags & CEPH_OPT_RBYTES) == 0)
161 seq_puts(m, ",norbytes");
162 if (args->flags & CEPH_OPT_NOCRC)
163 seq_puts(m, ",nocrc");
164 if (args->flags & CEPH_OPT_NOASYNCREADDIR)
165 seq_puts(m, ",noasyncreaddir");
167 if (args->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
168 seq_printf(m, ",mount_timeout=%d", args->mount_timeout);
169 if (args->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
170 seq_printf(m, ",osd_idle_ttl=%d", args->osd_idle_ttl);
171 if (args->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
172 seq_printf(m, ",osdtimeout=%d", args->osd_timeout);
173 if (args->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
174 seq_printf(m, ",osdkeepalivetimeout=%d",
175 args->osd_keepalive_timeout);
177 seq_printf(m, ",wsize=%d", args->wsize);
178 if (args->rsize != CEPH_MOUNT_RSIZE_DEFAULT)
179 seq_printf(m, ",rsize=%d", args->rsize);
180 if (args->congestion_kb != default_congestion_kb())
181 seq_printf(m, ",write_congestion_kb=%d", args->congestion_kb);
182 if (args->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
183 seq_printf(m, ",caps_wanted_delay_min=%d",
184 args->caps_wanted_delay_min);
185 if (args->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
186 seq_printf(m, ",caps_wanted_delay_max=%d",
187 args->caps_wanted_delay_max);
188 if (args->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
189 seq_printf(m, ",cap_release_safety=%d",
190 args->cap_release_safety);
191 if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT)
192 seq_printf(m, ",readdir_max_entries=%d", args->max_readdir);
193 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
194 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
196 seq_printf(m, ",name=%s", args->name);
198 seq_puts(m, ",secret=<hidden>");
205 struct kmem_cache *ceph_inode_cachep;
206 struct kmem_cache *ceph_cap_cachep;
207 struct kmem_cache *ceph_dentry_cachep;
208 struct kmem_cache *ceph_file_cachep;
210 static void ceph_inode_init_once(void *foo)
212 struct ceph_inode_info *ci = foo;
213 inode_init_once(&ci->vfs_inode);
216 static int __init init_caches(void)
218 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
219 sizeof(struct ceph_inode_info),
220 __alignof__(struct ceph_inode_info),
221 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
222 ceph_inode_init_once);
223 if (ceph_inode_cachep == NULL)
226 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
227 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
228 if (ceph_cap_cachep == NULL)
231 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
232 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
233 if (ceph_dentry_cachep == NULL)
236 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
237 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
238 if (ceph_file_cachep == NULL)
244 kmem_cache_destroy(ceph_dentry_cachep);
246 kmem_cache_destroy(ceph_cap_cachep);
248 kmem_cache_destroy(ceph_inode_cachep);
252 static void destroy_caches(void)
254 kmem_cache_destroy(ceph_inode_cachep);
255 kmem_cache_destroy(ceph_cap_cachep);
256 kmem_cache_destroy(ceph_dentry_cachep);
257 kmem_cache_destroy(ceph_file_cachep);
262 * ceph_umount_begin - initiate forced umount. Tear down down the
263 * mount, skipping steps that may hang while waiting for server(s).
265 static void ceph_umount_begin(struct super_block *sb)
267 struct ceph_client *client = ceph_sb_to_client(sb);
269 dout("ceph_umount_begin - starting forced umount\n");
272 client->mount_state = CEPH_MOUNT_SHUTDOWN;
276 static const struct super_operations ceph_super_ops = {
277 .alloc_inode = ceph_alloc_inode,
278 .destroy_inode = ceph_destroy_inode,
279 .write_inode = ceph_write_inode,
280 .sync_fs = ceph_syncfs,
281 .put_super = ceph_put_super,
282 .show_options = ceph_show_options,
283 .statfs = ceph_statfs,
284 .umount_begin = ceph_umount_begin,
288 const char *ceph_msg_type_name(int type)
291 case CEPH_MSG_SHUTDOWN: return "shutdown";
292 case CEPH_MSG_PING: return "ping";
293 case CEPH_MSG_AUTH: return "auth";
294 case CEPH_MSG_AUTH_REPLY: return "auth_reply";
295 case CEPH_MSG_MON_MAP: return "mon_map";
296 case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
297 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
298 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
299 case CEPH_MSG_STATFS: return "statfs";
300 case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
301 case CEPH_MSG_MDS_MAP: return "mds_map";
302 case CEPH_MSG_CLIENT_SESSION: return "client_session";
303 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
304 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
305 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
306 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
307 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
308 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
309 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
310 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
311 case CEPH_MSG_OSD_MAP: return "osd_map";
312 case CEPH_MSG_OSD_OP: return "osd_op";
313 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
314 default: return "unknown";
329 Opt_osdkeepalivetimeout,
332 Opt_caps_wanted_delay_min,
333 Opt_caps_wanted_delay_max,
334 Opt_cap_release_safety,
335 Opt_readdir_max_entries,
343 /* string args above */
354 static match_table_t arg_tokens = {
355 {Opt_fsidmajor, "fsidmajor=%ld"},
356 {Opt_fsidminor, "fsidminor=%ld"},
357 {Opt_monport, "monport=%d"},
358 {Opt_wsize, "wsize=%d"},
359 {Opt_rsize, "rsize=%d"},
360 {Opt_osdtimeout, "osdtimeout=%d"},
361 {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
362 {Opt_mount_timeout, "mount_timeout=%d"},
363 {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
364 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
365 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
366 {Opt_cap_release_safety, "cap_release_safety=%d"},
367 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
368 {Opt_congestion_kb, "write_congestion_kb=%d"},
370 {Opt_snapdirname, "snapdirname=%s"},
371 {Opt_name, "name=%s"},
372 {Opt_secret, "secret=%s"},
373 /* string args above */
375 {Opt_noshare, "noshare"},
376 {Opt_dirstat, "dirstat"},
377 {Opt_nodirstat, "nodirstat"},
378 {Opt_rbytes, "rbytes"},
379 {Opt_norbytes, "norbytes"},
380 {Opt_nocrc, "nocrc"},
381 {Opt_noasyncreaddir, "noasyncreaddir"},
386 static struct ceph_mount_args *parse_mount_args(int flags, char *options,
387 const char *dev_name,
390 struct ceph_mount_args *args;
393 substring_t argstr[MAX_OPT_ARGS];
395 args = kzalloc(sizeof(*args), GFP_KERNEL);
397 return ERR_PTR(-ENOMEM);
398 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
403 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
405 /* start with defaults */
406 args->sb_flags = flags;
407 args->flags = CEPH_OPT_DEFAULT;
408 args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
409 args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
410 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
411 args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
412 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
413 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
414 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
415 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
416 args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
417 args->max_readdir = CEPH_MAX_READDIR_DEFAULT;
418 args->congestion_kb = default_congestion_kb();
420 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
424 *path = strstr(dev_name, ":/");
426 pr_err("device name is missing path (no :/ in %s)\n",
432 err = ceph_parse_ips(dev_name, *path, args->mon_addr,
433 CEPH_MAX_MON, &args->num_mon);
439 dout("server path '%s'\n", *path);
441 /* parse mount options */
442 while ((c = strsep(&options, ",")) != NULL) {
443 int token, intval, ret;
447 token = match_token((char *)c, arg_tokens, argstr);
449 pr_err("bad mount option at '%s'\n", c);
452 if (token < Opt_last_int) {
453 ret = match_int(&argstr[0], &intval);
455 pr_err("bad mount option arg (not int) "
459 dout("got int token %d val %d\n", token, intval);
460 } else if (token > Opt_last_int && token < Opt_last_string) {
461 dout("got string token %d val %s\n", token,
464 dout("got token %d\n", token);
468 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
471 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
474 err = ceph_parse_ips(argstr[0].from,
480 args->flags |= CEPH_OPT_MYIP;
483 case Opt_snapdirname:
484 kfree(args->snapdir_name);
485 args->snapdir_name = kstrndup(argstr[0].from,
486 argstr[0].to-argstr[0].from,
490 args->name = kstrndup(argstr[0].from,
491 argstr[0].to-argstr[0].from,
495 args->secret = kstrndup(argstr[0].from,
496 argstr[0].to-argstr[0].from,
502 args->wsize = intval;
505 args->rsize = intval;
508 args->osd_timeout = intval;
510 case Opt_osdkeepalivetimeout:
511 args->osd_keepalive_timeout = intval;
513 case Opt_mount_timeout:
514 args->mount_timeout = intval;
516 case Opt_caps_wanted_delay_min:
517 args->caps_wanted_delay_min = intval;
519 case Opt_caps_wanted_delay_max:
520 args->caps_wanted_delay_max = intval;
522 case Opt_readdir_max_entries:
523 args->max_readdir = intval;
525 case Opt_congestion_kb:
526 args->congestion_kb = intval;
530 args->flags |= CEPH_OPT_NOSHARE;
534 args->flags |= CEPH_OPT_DIRSTAT;
537 args->flags &= ~CEPH_OPT_DIRSTAT;
540 args->flags |= CEPH_OPT_RBYTES;
543 args->flags &= ~CEPH_OPT_RBYTES;
546 args->flags |= CEPH_OPT_NOCRC;
548 case Opt_noasyncreaddir:
549 args->flags |= CEPH_OPT_NOASYNCREADDIR;
559 kfree(args->mon_addr);
564 static void destroy_mount_args(struct ceph_mount_args *args)
566 dout("destroy_mount_args %p\n", args);
567 kfree(args->snapdir_name);
568 args->snapdir_name = NULL;
577 * create a fresh client instance
579 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
581 struct ceph_client *client;
584 client = kzalloc(sizeof(*client), GFP_KERNEL);
586 return ERR_PTR(-ENOMEM);
588 mutex_init(&client->mount_mutex);
590 init_waitqueue_head(&client->auth_wq);
593 client->mount_state = CEPH_MOUNT_MOUNTING;
594 client->mount_args = args;
598 client->auth_err = 0;
599 atomic_long_set(&client->writeback_count, 0);
601 err = bdi_init(&client->backing_dev_info);
606 client->wb_wq = create_workqueue("ceph-writeback");
607 if (client->wb_wq == NULL)
609 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
610 if (client->pg_inv_wq == NULL)
612 client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
613 if (client->trunc_wq == NULL)
616 /* set up mempools */
618 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
619 client->mount_args->wsize >> PAGE_CACHE_SHIFT);
620 if (!client->wb_pagevec_pool)
624 client->min_caps = args->max_readdir;
625 ceph_adjust_min_caps(client->min_caps);
628 err = ceph_monc_init(&client->monc, client);
631 err = ceph_osdc_init(&client->osdc, client);
634 err = ceph_mdsc_init(&client->mdsc, client);
640 ceph_osdc_stop(&client->osdc);
642 ceph_monc_stop(&client->monc);
644 mempool_destroy(client->wb_pagevec_pool);
646 destroy_workqueue(client->trunc_wq);
648 destroy_workqueue(client->pg_inv_wq);
650 destroy_workqueue(client->wb_wq);
652 bdi_destroy(&client->backing_dev_info);
658 static void ceph_destroy_client(struct ceph_client *client)
660 dout("destroy_client %p\n", client);
663 ceph_mdsc_stop(&client->mdsc);
664 ceph_monc_stop(&client->monc);
665 ceph_osdc_stop(&client->osdc);
667 ceph_adjust_min_caps(-client->min_caps);
669 ceph_debugfs_client_cleanup(client);
670 destroy_workqueue(client->wb_wq);
671 destroy_workqueue(client->pg_inv_wq);
672 destroy_workqueue(client->trunc_wq);
674 bdi_destroy(&client->backing_dev_info);
677 ceph_messenger_destroy(client->msgr);
678 mempool_destroy(client->wb_pagevec_pool);
680 destroy_mount_args(client->mount_args);
683 dout("destroy_client %p done\n", client);
687 * Initially learn our fsid, or verify an fsid matches.
689 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
691 if (client->have_fsid) {
692 if (ceph_fsid_compare(&client->fsid, fsid)) {
693 pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
694 PR_FSID(&client->fsid), PR_FSID(fsid));
698 pr_info("client%lld fsid " FSID_FORMAT "\n",
699 client->monc.auth->global_id, PR_FSID(fsid));
700 memcpy(&client->fsid, fsid, sizeof(*fsid));
701 ceph_debugfs_client_init(client);
702 client->have_fsid = true;
708 * true if we have the mon map (and have thus joined the cluster)
710 static int have_mon_and_osd_map(struct ceph_client *client)
712 return client->monc.monmap && client->monc.monmap->epoch &&
713 client->osdc.osdmap && client->osdc.osdmap->epoch;
717 * Bootstrap mount by opening the root directory. Note the mount
718 * @started time from caller, and time out if this takes too long.
720 static struct dentry *open_root_dentry(struct ceph_client *client,
722 unsigned long started)
724 struct ceph_mds_client *mdsc = &client->mdsc;
725 struct ceph_mds_request *req = NULL;
730 dout("open_root_inode opening '%s'\n", path);
731 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
733 return ERR_PTR(PTR_ERR(req));
734 req->r_path1 = kstrdup(path, GFP_NOFS);
735 req->r_ino1.ino = CEPH_INO_ROOT;
736 req->r_ino1.snap = CEPH_NOSNAP;
737 req->r_started = started;
738 req->r_timeout = client->mount_args->mount_timeout * HZ;
739 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
741 err = ceph_mdsc_do_request(mdsc, NULL, req);
743 dout("open_root_inode success\n");
744 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
745 client->sb->s_root == NULL)
746 root = d_alloc_root(req->r_target_inode);
748 root = d_obtain_alias(req->r_target_inode);
749 req->r_target_inode = NULL;
750 dout("open_root_inode success, root dentry is %p\n", root);
754 ceph_mdsc_put_request(req);
759 * mount: join the ceph cluster, and open root directory.
761 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
764 struct ceph_entity_addr *myaddr = NULL;
766 unsigned long timeout = client->mount_args->mount_timeout * HZ;
767 unsigned long started = jiffies; /* note the start time */
770 dout("mount start\n");
771 mutex_lock(&client->mount_mutex);
773 /* initialize the messenger */
774 if (client->msgr == NULL) {
775 if (ceph_test_opt(client, MYIP))
776 myaddr = &client->mount_args->my_addr;
777 client->msgr = ceph_messenger_create(myaddr);
778 if (IS_ERR(client->msgr)) {
779 err = PTR_ERR(client->msgr);
783 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
786 /* open session, and wait for mon, mds, and osd maps */
787 err = ceph_monc_open_session(&client->monc);
791 while (!have_mon_and_osd_map(client)) {
793 if (timeout && time_after_eq(jiffies, started + timeout))
797 dout("mount waiting for mon_map\n");
798 err = wait_event_interruptible_timeout(client->auth_wq,
799 have_mon_and_osd_map(client) || (client->auth_err < 0),
801 if (err == -EINTR || err == -ERESTARTSYS)
803 if (client->auth_err < 0) {
804 err = client->auth_err;
809 dout("mount opening root\n");
810 root = open_root_dentry(client, "", started);
815 if (client->sb->s_root)
818 client->sb->s_root = root;
823 dout("mount opening base mountpoint\n");
824 root = open_root_dentry(client, path, started);
827 dput(client->sb->s_root);
828 client->sb->s_root = NULL;
833 mnt->mnt_root = root;
834 mnt->mnt_sb = client->sb;
836 client->mount_state = CEPH_MOUNT_MOUNTED;
837 dout("mount success\n");
841 mutex_unlock(&client->mount_mutex);
845 static int ceph_set_super(struct super_block *s, void *data)
847 struct ceph_client *client = data;
850 dout("set_super %p data %p\n", s, data);
852 s->s_flags = client->mount_args->sb_flags;
853 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
855 s->s_fs_info = client;
858 s->s_op = &ceph_super_ops;
859 s->s_export_op = &ceph_export_ops;
861 s->s_time_gran = 1000; /* 1000 ns == 1 us */
863 ret = set_anon_super(s, NULL); /* what is that second arg for? */
876 * share superblock if same fs AND options
878 static int ceph_compare_super(struct super_block *sb, void *data)
880 struct ceph_client *new = data;
881 struct ceph_mount_args *args = new->mount_args;
882 struct ceph_client *other = ceph_sb_to_client(sb);
885 dout("ceph_compare_super %p\n", sb);
886 if (args->flags & CEPH_OPT_FSID) {
887 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
888 dout("fsid doesn't match\n");
892 /* do we share (a) monitor? */
893 for (i = 0; i < new->monc.monmap->num_mon; i++)
894 if (ceph_monmap_contains(other->monc.monmap,
895 &new->monc.monmap->mon_inst[i].addr))
897 if (i == new->monc.monmap->num_mon) {
898 dout("mon ip not part of monmap\n");
901 dout("mon ip matches existing sb %p\n", sb);
903 if (args->sb_flags != other->mount_args->sb_flags) {
904 dout("flags differ\n");
911 * construct our own bdi so we can control readahead, etc.
913 static atomic_long_t bdi_seq = ATOMIC_INIT(0);
915 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
919 /* set ra_pages based on rsize mount option? */
920 if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
921 client->backing_dev_info.ra_pages =
922 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
924 err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d",
925 atomic_long_inc_return(&bdi_seq));
927 sb->s_bdi = &client->backing_dev_info;
931 static int ceph_get_sb(struct file_system_type *fs_type,
932 int flags, const char *dev_name, void *data,
933 struct vfsmount *mnt)
935 struct super_block *sb;
936 struct ceph_client *client;
938 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
939 const char *path = NULL;
940 struct ceph_mount_args *args;
942 dout("ceph_get_sb\n");
943 args = parse_mount_args(flags, data, dev_name, &path);
949 /* create client (which we may/may not use) */
950 client = ceph_create_client(args);
951 if (IS_ERR(client)) {
952 err = PTR_ERR(client);
956 if (client->mount_args->flags & CEPH_OPT_NOSHARE)
957 compare_super = NULL;
958 sb = sget(fs_type, compare_super, ceph_set_super, client);
964 if (ceph_sb_to_client(sb) != client) {
965 ceph_destroy_client(client);
966 client = ceph_sb_to_client(sb);
967 dout("get_sb got existing client %p\n", client);
969 dout("get_sb using new client %p\n", client);
970 err = ceph_register_bdi(sb, client);
975 err = ceph_mount(client, mnt, path);
978 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
979 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
983 ceph_mdsc_close_sessions(&client->mdsc);
984 up_write(&sb->s_umount);
985 deactivate_super(sb);
989 ceph_destroy_client(client);
991 dout("ceph_get_sb fail %d\n", err);
995 static void ceph_kill_sb(struct super_block *s)
997 struct ceph_client *client = ceph_sb_to_client(s);
998 dout("kill_sb %p\n", s);
999 ceph_mdsc_pre_umount(&client->mdsc);
1000 kill_anon_super(s); /* will call put_super after sb is r/o */
1001 ceph_destroy_client(client);
1004 static struct file_system_type ceph_fs_type = {
1005 .owner = THIS_MODULE,
1007 .get_sb = ceph_get_sb,
1008 .kill_sb = ceph_kill_sb,
1009 .fs_flags = FS_RENAME_DOES_D_MOVE,
1012 #define _STRINGIFY(x) #x
1013 #define STRINGIFY(x) _STRINGIFY(x)
1015 static int __init init_ceph(void)
1019 ret = ceph_debugfs_init();
1023 ret = ceph_msgr_init();
1027 ret = init_caches();
1033 ret = register_filesystem(&ceph_fs_type);
1037 pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n",
1038 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL,
1039 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
1040 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
1048 ceph_debugfs_cleanup();
1053 static void __exit exit_ceph(void)
1055 dout("exit_ceph\n");
1056 unregister_filesystem(&ceph_fs_type);
1057 ceph_caps_finalize();
1060 ceph_debugfs_cleanup();
1063 module_init(init_ceph);
1064 module_exit(exit_ceph);
1066 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1067 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1068 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1069 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1070 MODULE_LICENSE("GPL");