1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <linux/ceph/ceph_debug.h>
5 #include <linux/backing-dev.h>
6 #include <linux/ctype.h>
8 #include <linux/inet.h>
10 #include <linux/module.h>
11 #include <linux/mount.h>
12 #include <linux/fs_context.h>
13 #include <linux/fs_parser.h>
14 #include <linux/sched.h>
15 #include <linux/seq_file.h>
16 #include <linux/slab.h>
17 #include <linux/statfs.h>
18 #include <linux/string.h>
21 #include "mds_client.h"
24 #include <linux/ceph/ceph_features.h>
25 #include <linux/ceph/decode.h>
26 #include <linux/ceph/mon_client.h>
27 #include <linux/ceph/auth.h>
28 #include <linux/ceph/debugfs.h>
31 * Ceph superblock operations
33 * Handle the basics of mounting, unmounting.
39 static void ceph_put_super(struct super_block *s)
41 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
44 ceph_mdsc_close_sessions(fsc->mdsc);
47 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
49 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
50 struct ceph_mon_client *monc = &fsc->client->monc;
51 struct ceph_statfs st;
56 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
57 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
59 data_pool = CEPH_NOPOOL;
63 err = ceph_monc_do_statfs(monc, data_pool, &st);
68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
71 * express utilization in terms of large blocks to avoid
72 * overflow on 32-bit machines.
74 * NOTE: for the time being, we make bsize == frsize to humor
75 * not-yet-ancient versions of glibc that are broken.
76 * Someday, we will probably want to report a real block
77 * size... whatever that may mean for a network file system!
79 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
80 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
83 * By default use root quota for stats; fallback to overall filesystem
84 * usage if using 'noquotadf' mount option or if the root dir doesn't
85 * have max_bytes quota set.
87 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
88 !ceph_quota_update_statfs(fsc, buf)) {
89 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
90 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
91 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
94 buf->f_files = le64_to_cpu(st.num_objects);
96 buf->f_namelen = NAME_MAX;
98 /* Must convert the fsid, for consistent values across arches */
99 mutex_lock(&monc->mutex);
100 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
101 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
102 mutex_unlock(&monc->mutex);
104 buf->f_fsid.val[0] = fsid & 0xffffffff;
105 buf->f_fsid.val[1] = fsid >> 32;
111 static int ceph_sync_fs(struct super_block *sb, int wait)
113 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
116 dout("sync_fs (non-blocking)\n");
117 ceph_flush_dirty_caps(fsc->mdsc);
118 dout("sync_fs (non-blocking) done\n");
122 dout("sync_fs (blocking)\n");
123 ceph_osdc_sync(&fsc->client->osdc);
124 ceph_mdsc_sync(fsc->mdsc);
125 dout("sync_fs (blocking) done\n");
136 Opt_caps_wanted_delay_min,
137 Opt_caps_wanted_delay_max,
139 Opt_readdir_max_entries,
140 Opt_readdir_max_bytes,
147 /* string args above */
155 Opt_require_active_mds,
161 enum ceph_recover_session_mode {
162 ceph_recover_session_no,
163 ceph_recover_session_clean
166 static const struct constant_table ceph_param_recover[] = {
167 { "no", ceph_recover_session_no },
168 { "clean", ceph_recover_session_clean },
172 static const struct fs_parameter_spec ceph_mount_parameters[] = {
173 fsparam_flag_no ("acl", Opt_acl),
174 fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
175 fsparam_s32 ("caps_max", Opt_caps_max),
176 fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
177 fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
178 fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
179 fsparam_flag_no ("copyfrom", Opt_copyfrom),
180 fsparam_flag_no ("dcache", Opt_dcache),
181 fsparam_flag_no ("dirstat", Opt_dirstat),
182 __fsparam (fs_param_is_string, "fsc", Opt_fscache,
183 fs_param_neg_with_no | fs_param_v_optional, NULL),
184 fsparam_flag_no ("ino32", Opt_ino32),
185 fsparam_string ("mds_namespace", Opt_mds_namespace),
186 fsparam_flag_no ("poolperm", Opt_poolperm),
187 fsparam_flag_no ("quotadf", Opt_quotadf),
188 fsparam_u32 ("rasize", Opt_rasize),
189 fsparam_flag_no ("rbytes", Opt_rbytes),
190 fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
191 fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
192 fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
193 fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
194 fsparam_u32 ("rsize", Opt_rsize),
195 fsparam_string ("snapdirname", Opt_snapdirname),
196 fsparam_string ("source", Opt_source),
197 fsparam_u32 ("wsize", Opt_wsize),
201 struct ceph_parse_opts_ctx {
202 struct ceph_options *copts;
203 struct ceph_mount_options *opts;
207 * Parse the source parameter. Distinguish the server list from the path.
208 * Internally we do not include the leading '/' in the path.
210 * The source will look like:
211 * <server_spec>[,<server_spec>...]:[<path>]
213 * <server_spec> is <ip>[:<port>]
214 * <path> is optional, but if present must begin with '/'
216 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
218 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
219 struct ceph_mount_options *fsopt = pctx->opts;
220 char *dev_name = param->string, *dev_name_end;
223 dout("%s '%s'\n", __func__, dev_name);
224 if (!dev_name || !*dev_name)
225 return invalf(fc, "ceph: Empty source");
227 dev_name_end = strchr(dev_name, '/');
229 if (strlen(dev_name_end) > 1) {
230 kfree(fsopt->server_path);
231 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
232 if (!fsopt->server_path)
236 dev_name_end = dev_name + strlen(dev_name);
239 dev_name_end--; /* back up to ':' separator */
240 if (dev_name_end < dev_name || *dev_name_end != ':')
241 return invalf(fc, "ceph: No path or : separator in source");
243 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
244 if (fsopt->server_path)
245 dout("server path '%s'\n", fsopt->server_path);
247 ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
248 pctx->copts, fc->log.log);
252 fc->source = param->string;
253 param->string = NULL;
257 static int ceph_parse_mount_param(struct fs_context *fc,
258 struct fs_parameter *param)
260 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
261 struct ceph_mount_options *fsopt = pctx->opts;
262 struct fs_parse_result result;
266 ret = ceph_parse_param(param, pctx->copts, fc->log.log);
267 if (ret != -ENOPARAM)
270 token = fs_parse(fc, ceph_mount_parameters, param, &result);
271 dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
276 case Opt_snapdirname:
277 kfree(fsopt->snapdir_name);
278 fsopt->snapdir_name = param->string;
279 param->string = NULL;
281 case Opt_mds_namespace:
282 kfree(fsopt->mds_namespace);
283 fsopt->mds_namespace = param->string;
284 param->string = NULL;
286 case Opt_recover_session:
287 mode = result.uint_32;
288 if (mode == ceph_recover_session_no)
289 fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
290 else if (mode == ceph_recover_session_clean)
291 fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
297 return invalf(fc, "ceph: Multiple sources specified");
298 return ceph_parse_source(param, fc);
300 if (result.uint_32 < PAGE_SIZE ||
301 result.uint_32 > CEPH_MAX_WRITE_SIZE)
303 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
306 if (result.uint_32 < PAGE_SIZE ||
307 result.uint_32 > CEPH_MAX_READ_SIZE)
309 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
312 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
314 case Opt_caps_wanted_delay_min:
315 if (result.uint_32 < 1)
317 fsopt->caps_wanted_delay_min = result.uint_32;
319 case Opt_caps_wanted_delay_max:
320 if (result.uint_32 < 1)
322 fsopt->caps_wanted_delay_max = result.uint_32;
325 if (result.int_32 < 0)
327 fsopt->caps_max = result.int_32;
329 case Opt_readdir_max_entries:
330 if (result.uint_32 < 1)
332 fsopt->max_readdir = result.uint_32;
334 case Opt_readdir_max_bytes:
335 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
337 fsopt->max_readdir_bytes = result.uint_32;
339 case Opt_congestion_kb:
340 if (result.uint_32 < 1024) /* at least 1M */
342 fsopt->congestion_kb = result.uint_32;
346 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
348 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
352 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
354 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
356 case Opt_asyncreaddir:
358 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
360 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
364 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
366 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
370 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
372 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
376 #ifdef CONFIG_CEPH_FSCACHE
377 kfree(fsopt->fscache_uniq);
378 fsopt->fscache_uniq = NULL;
379 if (result.negated) {
380 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
382 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
383 fsopt->fscache_uniq = param->string;
384 param->string = NULL;
388 return invalf(fc, "ceph: fscache support is disabled");
392 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
394 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
396 case Opt_require_active_mds:
398 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
400 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
404 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
406 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
410 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
412 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
415 if (!result.negated) {
416 #ifdef CONFIG_CEPH_FS_POSIX_ACL
417 fc->sb_flags |= SB_POSIXACL;
419 return invalf(fc, "ceph: POSIX ACL support is disabled");
422 fc->sb_flags &= ~SB_POSIXACL;
431 return invalf(fc, "ceph: %s out of range", param->key);
434 static void destroy_mount_options(struct ceph_mount_options *args)
436 dout("destroy_mount_options %p\n", args);
440 kfree(args->snapdir_name);
441 kfree(args->mds_namespace);
442 kfree(args->server_path);
443 kfree(args->fscache_uniq);
447 static int strcmp_null(const char *s1, const char *s2)
455 return strcmp(s1, s2);
458 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
459 struct ceph_options *new_opt,
460 struct ceph_fs_client *fsc)
462 struct ceph_mount_options *fsopt1 = new_fsopt;
463 struct ceph_mount_options *fsopt2 = fsc->mount_options;
464 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
467 ret = memcmp(fsopt1, fsopt2, ofs);
471 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
474 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
477 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
480 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
484 return ceph_compare_options(new_opt, fsc->client);
488 * ceph_show_options - Show mount options in /proc/mounts
489 * @m: seq_file to write to
490 * @root: root of that (sub)tree
492 static int ceph_show_options(struct seq_file *m, struct dentry *root)
494 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
495 struct ceph_mount_options *fsopt = fsc->mount_options;
499 /* a comma between MNT/MS and client options */
503 ret = ceph_print_client_options(m, fsc->client, false);
507 /* retract our comma if no client options */
511 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
512 seq_puts(m, ",dirstat");
513 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
514 seq_puts(m, ",rbytes");
515 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
516 seq_puts(m, ",noasyncreaddir");
517 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
518 seq_puts(m, ",nodcache");
519 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
520 seq_puts(m, ",ino32");
521 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
522 seq_show_option(m, "fsc", fsopt->fscache_uniq);
524 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
525 seq_puts(m, ",nopoolperm");
526 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
527 seq_puts(m, ",noquotadf");
529 #ifdef CONFIG_CEPH_FS_POSIX_ACL
530 if (root->d_sb->s_flags & SB_POSIXACL)
533 seq_puts(m, ",noacl");
536 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
537 seq_puts(m, ",copyfrom");
539 if (fsopt->mds_namespace)
540 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
542 if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
543 seq_show_option(m, "recover_session", "clean");
545 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
546 seq_printf(m, ",wsize=%u", fsopt->wsize);
547 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
548 seq_printf(m, ",rsize=%u", fsopt->rsize);
549 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
550 seq_printf(m, ",rasize=%u", fsopt->rasize);
551 if (fsopt->congestion_kb != default_congestion_kb())
552 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
554 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
555 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
556 seq_printf(m, ",caps_wanted_delay_min=%u",
557 fsopt->caps_wanted_delay_min);
558 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
559 seq_printf(m, ",caps_wanted_delay_max=%u",
560 fsopt->caps_wanted_delay_max);
561 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
562 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
563 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
564 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
565 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
566 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
572 * handle any mon messages the standard library doesn't understand.
573 * return error if we don't either.
575 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
577 struct ceph_fs_client *fsc = client->private;
578 int type = le16_to_cpu(msg->hdr.type);
581 case CEPH_MSG_MDS_MAP:
582 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
584 case CEPH_MSG_FS_MAP_USER:
585 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
593 * create a new fs client
595 * Success or not, this function consumes @fsopt and @opt.
597 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
598 struct ceph_options *opt)
600 struct ceph_fs_client *fsc;
605 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
611 fsc->client = ceph_create_client(opt, fsc);
612 if (IS_ERR(fsc->client)) {
613 err = PTR_ERR(fsc->client);
616 opt = NULL; /* fsc->client now owns this */
618 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
619 ceph_set_opt(fsc->client, ABORT_ON_FULL);
621 if (!fsopt->mds_namespace) {
622 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
625 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
629 fsc->mount_options = fsopt;
632 fsc->mount_state = CEPH_MOUNT_MOUNTING;
635 atomic_long_set(&fsc->writeback_count, 0);
639 * The number of concurrent works can be high but they don't need
640 * to be processed in parallel, limit concurrency.
642 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
645 fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
649 /* set up mempools */
651 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
652 size = sizeof (struct page *) * (page_count ? page_count : 1);
653 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
654 if (!fsc->wb_pagevec_pool)
660 destroy_workqueue(fsc->cap_wq);
662 destroy_workqueue(fsc->inode_wq);
664 ceph_destroy_client(fsc->client);
668 ceph_destroy_options(opt);
669 destroy_mount_options(fsopt);
673 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
675 flush_workqueue(fsc->inode_wq);
676 flush_workqueue(fsc->cap_wq);
679 static void destroy_fs_client(struct ceph_fs_client *fsc)
681 dout("destroy_fs_client %p\n", fsc);
683 ceph_mdsc_destroy(fsc);
684 destroy_workqueue(fsc->inode_wq);
685 destroy_workqueue(fsc->cap_wq);
687 mempool_destroy(fsc->wb_pagevec_pool);
689 destroy_mount_options(fsc->mount_options);
691 ceph_destroy_client(fsc->client);
694 dout("destroy_fs_client %p done\n", fsc);
700 struct kmem_cache *ceph_inode_cachep;
701 struct kmem_cache *ceph_cap_cachep;
702 struct kmem_cache *ceph_cap_flush_cachep;
703 struct kmem_cache *ceph_dentry_cachep;
704 struct kmem_cache *ceph_file_cachep;
705 struct kmem_cache *ceph_dir_file_cachep;
707 static void ceph_inode_init_once(void *foo)
709 struct ceph_inode_info *ci = foo;
710 inode_init_once(&ci->vfs_inode);
713 static int __init init_caches(void)
717 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
718 sizeof(struct ceph_inode_info),
719 __alignof__(struct ceph_inode_info),
720 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
721 SLAB_ACCOUNT, ceph_inode_init_once);
722 if (!ceph_inode_cachep)
725 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
726 if (!ceph_cap_cachep)
728 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
729 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
730 if (!ceph_cap_flush_cachep)
733 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
734 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
735 if (!ceph_dentry_cachep)
738 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
739 if (!ceph_file_cachep)
742 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
743 if (!ceph_dir_file_cachep)
746 error = ceph_fscache_register();
753 kmem_cache_destroy(ceph_dir_file_cachep);
755 kmem_cache_destroy(ceph_file_cachep);
757 kmem_cache_destroy(ceph_dentry_cachep);
759 kmem_cache_destroy(ceph_cap_flush_cachep);
761 kmem_cache_destroy(ceph_cap_cachep);
763 kmem_cache_destroy(ceph_inode_cachep);
767 static void destroy_caches(void)
770 * Make sure all delayed rcu free inodes are flushed before we
775 kmem_cache_destroy(ceph_inode_cachep);
776 kmem_cache_destroy(ceph_cap_cachep);
777 kmem_cache_destroy(ceph_cap_flush_cachep);
778 kmem_cache_destroy(ceph_dentry_cachep);
779 kmem_cache_destroy(ceph_file_cachep);
780 kmem_cache_destroy(ceph_dir_file_cachep);
782 ceph_fscache_unregister();
787 * ceph_umount_begin - initiate forced umount. Tear down down the
788 * mount, skipping steps that may hang while waiting for server(s).
790 static void ceph_umount_begin(struct super_block *sb)
792 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
794 dout("ceph_umount_begin - starting forced umount\n");
797 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
798 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
799 ceph_mdsc_force_umount(fsc->mdsc);
800 fsc->filp_gen++; // invalidate open files
803 static const struct super_operations ceph_super_ops = {
804 .alloc_inode = ceph_alloc_inode,
805 .free_inode = ceph_free_inode,
806 .write_inode = ceph_write_inode,
807 .drop_inode = generic_delete_inode,
808 .evict_inode = ceph_evict_inode,
809 .sync_fs = ceph_sync_fs,
810 .put_super = ceph_put_super,
811 .show_options = ceph_show_options,
812 .statfs = ceph_statfs,
813 .umount_begin = ceph_umount_begin,
817 * Bootstrap mount by opening the root directory. Note the mount
818 * @started time from caller, and time out if this takes too long.
820 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
822 unsigned long started)
824 struct ceph_mds_client *mdsc = fsc->mdsc;
825 struct ceph_mds_request *req = NULL;
830 dout("open_root_inode opening '%s'\n", path);
831 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
833 return ERR_CAST(req);
834 req->r_path1 = kstrdup(path, GFP_NOFS);
836 root = ERR_PTR(-ENOMEM);
840 req->r_ino1.ino = CEPH_INO_ROOT;
841 req->r_ino1.snap = CEPH_NOSNAP;
842 req->r_started = started;
843 req->r_timeout = fsc->client->options->mount_timeout;
844 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
846 err = ceph_mdsc_do_request(mdsc, NULL, req);
848 struct inode *inode = req->r_target_inode;
849 req->r_target_inode = NULL;
850 dout("open_root_inode success\n");
851 root = d_make_root(inode);
853 root = ERR_PTR(-ENOMEM);
856 dout("open_root_inode success, root dentry is %p\n", root);
861 ceph_mdsc_put_request(req);
869 * mount: join the ceph cluster, and open root directory.
871 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
872 struct fs_context *fc)
875 unsigned long started = jiffies; /* note the start time */
878 dout("mount start %p\n", fsc);
879 mutex_lock(&fsc->client->mount_mutex);
881 if (!fsc->sb->s_root) {
883 err = __ceph_open_session(fsc->client, started);
888 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
889 err = ceph_fscache_register_fs(fsc, fc);
894 if (!fsc->mount_options->server_path) {
896 dout("mount opening path \\t\n");
898 path = fsc->mount_options->server_path + 1;
899 dout("mount opening path %s\n", path);
902 ceph_fs_debugfs_init(fsc);
904 root = open_root_dentry(fsc, path, started);
909 fsc->sb->s_root = dget(root);
911 root = dget(fsc->sb->s_root);
914 fsc->mount_state = CEPH_MOUNT_MOUNTED;
915 dout("mount success\n");
916 mutex_unlock(&fsc->client->mount_mutex);
920 mutex_unlock(&fsc->client->mount_mutex);
924 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
926 struct ceph_fs_client *fsc = s->s_fs_info;
929 dout("set_super %p\n", s);
931 s->s_maxbytes = MAX_LFS_FILESIZE;
933 s->s_xattr = ceph_xattr_handlers;
935 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
937 s->s_op = &ceph_super_ops;
938 s->s_d_op = &ceph_dentry_ops;
939 s->s_export_op = &ceph_export_ops;
943 s->s_time_max = U32_MAX;
945 ret = set_anon_super_fc(s, fc);
952 * share superblock if same fs AND options
954 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
956 struct ceph_fs_client *new = fc->s_fs_info;
957 struct ceph_mount_options *fsopt = new->mount_options;
958 struct ceph_options *opt = new->client->options;
959 struct ceph_fs_client *other = ceph_sb_to_client(sb);
961 dout("ceph_compare_super %p\n", sb);
963 if (compare_mount_options(fsopt, opt, other)) {
964 dout("monitor(s)/mount options don't match\n");
967 if ((opt->flags & CEPH_OPT_FSID) &&
968 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
969 dout("fsid doesn't match\n");
972 if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
973 dout("flags differ\n");
980 * construct our own bdi so we can control readahead, etc.
982 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
984 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
988 err = super_setup_bdi_name(sb, "ceph-%ld",
989 atomic_long_inc_return(&bdi_seq));
993 /* set ra_pages based on rasize mount option? */
994 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
996 /* set io_pages based on max osd read size */
997 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1002 static int ceph_get_tree(struct fs_context *fc)
1004 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1005 struct super_block *sb;
1006 struct ceph_fs_client *fsc;
1008 int (*compare_super)(struct super_block *, struct fs_context *) =
1012 dout("ceph_get_tree\n");
1015 return invalf(fc, "ceph: No source");
1017 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1018 fc->sb_flags |= SB_POSIXACL;
1021 /* create client (which we may/may not use) */
1022 fsc = create_fs_client(pctx->opts, pctx->copts);
1030 err = ceph_mdsc_init(fsc);
1034 if (ceph_test_opt(fsc->client, NOSHARE))
1035 compare_super = NULL;
1037 fc->s_fs_info = fsc;
1038 sb = sget_fc(fc, compare_super, ceph_set_super);
1039 fc->s_fs_info = NULL;
1045 if (ceph_sb_to_client(sb) != fsc) {
1046 destroy_fs_client(fsc);
1047 fsc = ceph_sb_to_client(sb);
1048 dout("get_sb got existing client %p\n", fsc);
1050 dout("get_sb using new client %p\n", fsc);
1051 err = ceph_setup_bdi(sb, fsc);
1056 res = ceph_real_mount(fsc, fc);
1061 dout("root %p inode %p ino %llx.%llx\n", res,
1062 d_inode(res), ceph_vinop(d_inode(res)));
1063 fc->root = fsc->sb->s_root;
1067 ceph_mdsc_close_sessions(fsc->mdsc);
1068 deactivate_locked_super(sb);
1072 destroy_fs_client(fsc);
1074 dout("ceph_get_tree fail %d\n", err);
1078 static void ceph_free_fc(struct fs_context *fc)
1080 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1083 destroy_mount_options(pctx->opts);
1084 ceph_destroy_options(pctx->copts);
1089 static int ceph_reconfigure_fc(struct fs_context *fc)
1091 sync_filesystem(fc->root->d_sb);
1095 static const struct fs_context_operations ceph_context_ops = {
1096 .free = ceph_free_fc,
1097 .parse_param = ceph_parse_mount_param,
1098 .get_tree = ceph_get_tree,
1099 .reconfigure = ceph_reconfigure_fc,
1103 * Set up the filesystem mount context.
1105 static int ceph_init_fs_context(struct fs_context *fc)
1107 struct ceph_parse_opts_ctx *pctx;
1108 struct ceph_mount_options *fsopt;
1110 pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1114 pctx->copts = ceph_alloc_options();
1118 pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1123 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1125 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1126 fsopt->rsize = CEPH_MAX_READ_SIZE;
1127 fsopt->rasize = CEPH_RASIZE_DEFAULT;
1128 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1129 if (!fsopt->snapdir_name)
1132 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1133 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1134 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1135 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1136 fsopt->congestion_kb = default_congestion_kb();
1138 fc->fs_private = pctx;
1139 fc->ops = &ceph_context_ops;
1143 destroy_mount_options(pctx->opts);
1144 ceph_destroy_options(pctx->copts);
1149 static void ceph_kill_sb(struct super_block *s)
1151 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1152 dev_t dev = s->s_dev;
1154 dout("kill_sb %p\n", s);
1156 ceph_mdsc_pre_umount(fsc->mdsc);
1157 flush_fs_workqueues(fsc);
1159 generic_shutdown_super(s);
1161 fsc->client->extra_mon_dispatch = NULL;
1162 ceph_fs_debugfs_cleanup(fsc);
1164 ceph_fscache_unregister_fs(fsc);
1166 destroy_fs_client(fsc);
1167 free_anon_bdev(dev);
1170 static struct file_system_type ceph_fs_type = {
1171 .owner = THIS_MODULE,
1173 .init_fs_context = ceph_init_fs_context,
1174 .kill_sb = ceph_kill_sb,
1175 .fs_flags = FS_RENAME_DOES_D_MOVE,
1177 MODULE_ALIAS_FS("ceph");
1179 int ceph_force_reconnect(struct super_block *sb)
1181 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1184 ceph_umount_begin(sb);
1186 /* Make sure all page caches get invalidated.
1187 * see remove_session_caps_cb() */
1188 flush_workqueue(fsc->inode_wq);
1190 /* In case that we were blacklisted. This also reset
1191 * all mon/osd connections */
1192 ceph_reset_client_addr(fsc->client);
1194 ceph_osdc_clear_abort_err(&fsc->client->osdc);
1196 fsc->blacklisted = false;
1197 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1200 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1201 CEPH_STAT_CAP_INODE, true);
1206 static int __init init_ceph(void)
1208 int ret = init_caches();
1213 ret = register_filesystem(&ceph_fs_type);
1217 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1227 static void __exit exit_ceph(void)
1229 dout("exit_ceph\n");
1230 unregister_filesystem(&ceph_fs_type);
1234 module_init(init_ceph);
1235 module_exit(exit_ceph);
1237 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1238 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1239 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1240 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1241 MODULE_LICENSE("GPL");