1	// SPDX-License-Identifier: GPL-2.0-only
2
3	#include <linux/ceph/ceph_debug.h>
4
5	#include <linux/backing-dev.h>
6	#include <linux/ctype.h>
7	#include <linux/fs.h>
8	#include <linux/inet.h>
9	#include <linux/in6.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>
19
20	#include "super.h"
21	#include "mds_client.h"
22	#include "cache.h"
23	#include "crypto.h"
24
25	#include <linux/ceph/ceph_features.h>
26	#include <linux/ceph/decode.h>
27	#include <linux/ceph/mon_client.h>
28	#include <linux/ceph/auth.h>
29	#include <linux/ceph/debugfs.h>
30
31	#include <uapi/linux/magic.h>
32
33	static DEFINE_SPINLOCK(ceph_fsc_lock);
34	static LIST_HEAD(ceph_fsc_list);
35
36	/*
37	* Ceph superblock operations
38	*
39	* Handle the basics of mounting, unmounting.
40	*/
41
42	/*
43	* super ops
44	*/
45	static void ceph_put_super(struct super_block *s)
46	{
47	struct ceph_fs_client *fsc = ceph_sb_to_client(sb: s);
48
49	dout("put_super\n");
50	ceph_fscrypt_free_dummy_policy(fsc);
51	ceph_mdsc_close_sessions(mdsc: fsc->mdsc);
52	}
53
54	static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
55	{
56	struct ceph_fs_client *fsc = ceph_inode_to_client(inode: d_inode(dentry));
57	struct ceph_mon_client *monc = &fsc->client->monc;
58	struct ceph_statfs st;
59	int i, err;
60	u64 data_pool;
61
62	if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
63	data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
64	} else {
65	data_pool = CEPH_NOPOOL;
66	}
67
68	dout("statfs\n");
69	err = ceph_monc_do_statfs(monc, data_pool, buf: &st);
70	if (err < 0)
71	return err;
72
73	/* fill in kstatfs */
74	buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
75
76	/*
77	* Express utilization in terms of large blocks to avoid
78	* overflow on 32-bit machines.
79	*/
80	buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
81
82	/*
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.
86	*/
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);
92	}
93
94	/*
95	* NOTE: for the time being, we make bsize == frsize to humor
96	* not-yet-ancient versions of glibc that are broken.
97	* Someday, we will probably want to report a real block
98	* size... whatever that may mean for a network file system!
99	*/
100	buf->f_bsize = buf->f_frsize;
101
102	buf->f_files = le64_to_cpu(st.num_objects);
103	buf->f_ffree = -1;
104	buf->f_namelen = NAME_MAX;
105
106	/* Must convert the fsid, for consistent values across arches */
107	buf->f_fsid.val[0] = 0;
108	mutex_lock(&monc->mutex);
109	for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
110	buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
111	mutex_unlock(lock: &monc->mutex);
112
113	/* fold the fs_cluster_id into the upper bits */
114	buf->f_fsid.val[1] = monc->fs_cluster_id;
115
116	return 0;
117	}
118
119	static int ceph_sync_fs(struct super_block *sb, int wait)
120	{
121	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
122
123	if (!wait) {
124	dout("sync_fs (non-blocking)\n");
125	ceph_flush_dirty_caps(mdsc: fsc->mdsc);
126	dout("sync_fs (non-blocking) done\n");
127	return 0;
128	}
129
130	dout("sync_fs (blocking)\n");
131	ceph_osdc_sync(osdc: &fsc->client->osdc);
132	ceph_mdsc_sync(mdsc: fsc->mdsc);
133	dout("sync_fs (blocking) done\n");
134	return 0;
135	}
136
137	/*
138	* mount options
139	*/
140	enum {
141	Opt_wsize,
142	Opt_rsize,
143	Opt_rasize,
144	Opt_caps_wanted_delay_min,
145	Opt_caps_wanted_delay_max,
146	Opt_caps_max,
147	Opt_readdir_max_entries,
148	Opt_readdir_max_bytes,
149	Opt_congestion_kb,
150	/* int args above */
151	Opt_snapdirname,
152	Opt_mds_namespace,
153	Opt_recover_session,
154	Opt_source,
155	Opt_mon_addr,
156	Opt_test_dummy_encryption,
157	/* string args above */
158	Opt_dirstat,
159	Opt_rbytes,
160	Opt_asyncreaddir,
161	Opt_dcache,
162	Opt_ino32,
163	Opt_fscache,
164	Opt_poolperm,
165	Opt_require_active_mds,
166	Opt_acl,
167	Opt_quotadf,
168	Opt_copyfrom,
169	Opt_wsync,
170	Opt_pagecache,
171	Opt_sparseread,
172	};
173
174	enum ceph_recover_session_mode {
175	ceph_recover_session_no,
176	ceph_recover_session_clean
177	};
178
179	static const struct constant_table ceph_param_recover[] = {
180	{ "no", ceph_recover_session_no },
181	{ "clean", ceph_recover_session_clean },
182	{}
183	};
184
185	static const struct fs_parameter_spec ceph_mount_parameters[] = {
186	fsparam_flag_no ("acl", Opt_acl),
187	fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
188	fsparam_s32 ("caps_max", Opt_caps_max),
189	fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
190	fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
191	fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
192	fsparam_flag_no ("copyfrom", Opt_copyfrom),
193	fsparam_flag_no ("dcache", Opt_dcache),
194	fsparam_flag_no ("dirstat", Opt_dirstat),
195	fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
196	fsparam_string ("fsc", Opt_fscache), // fsc=...
197	fsparam_flag_no ("ino32", Opt_ino32),
198	fsparam_string ("mds_namespace", Opt_mds_namespace),
199	fsparam_string ("mon_addr", Opt_mon_addr),
200	fsparam_flag_no ("poolperm", Opt_poolperm),
201	fsparam_flag_no ("quotadf", Opt_quotadf),
202	fsparam_u32 ("rasize", Opt_rasize),
203	fsparam_flag_no ("rbytes", Opt_rbytes),
204	fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
205	fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
206	fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
207	fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
208	fsparam_u32 ("rsize", Opt_rsize),
209	fsparam_string ("snapdirname", Opt_snapdirname),
210	fsparam_string ("source", Opt_source),
211	fsparam_flag ("test_dummy_encryption", Opt_test_dummy_encryption),
212	fsparam_string ("test_dummy_encryption", Opt_test_dummy_encryption),
213	fsparam_u32 ("wsize", Opt_wsize),
214	fsparam_flag_no ("wsync", Opt_wsync),
215	fsparam_flag_no ("pagecache", Opt_pagecache),
216	fsparam_flag_no ("sparseread", Opt_sparseread),
217	{}
218	};
219
220	struct ceph_parse_opts_ctx {
221	struct ceph_options *copts;
222	struct ceph_mount_options *opts;
223	};
224
225	/*
226	* Remove adjacent slashes and then the trailing slash, unless it is
227	* the only remaining character.
228	*
229	* E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
230	*/
231	static void canonicalize_path(char *path)
232	{
233	int i, j = 0;
234
235	for (i = 0; path[i] != '\0'; i++) {
236	if (path[i] != '/' || j < 1 || path[j - 1] != '/')
237	path[j++] = path[i];
238	}
239
240	if (j > 1 && path[j - 1] == '/')
241	j--;
242	path[j] = '\0';
243	}
244
245	/*
246	* Check if the mds namespace in ceph_mount_options matches
247	* the passed in namespace string. First time match (when
248	* ->mds_namespace is NULL) is treated specially, since
249	* ->mds_namespace needs to be initialized by the caller.
250	*/
251	static int namespace_equals(struct ceph_mount_options *fsopt,
252	const char *namespace, size_t len)
253	{
254	return !(fsopt->mds_namespace &&
255	(strlen(fsopt->mds_namespace) != len ||
256	strncmp(fsopt->mds_namespace, namespace, len)));
257	}
258
259	static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
260	struct fs_context *fc)
261	{
262	int r;
263	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
264	struct ceph_mount_options *fsopt = pctx->opts;
265
266	if (*dev_name_end != ':')
267	return invalfc(fc, "separator ':' missing in source");
268
269	r = ceph_parse_mon_ips(buf: dev_name, len: dev_name_end - dev_name,
270	opt: pctx->copts, l: fc->log.log, delim: ',');
271	if (r)
272	return r;
273
274	fsopt->new_dev_syntax = false;
275	return 0;
276	}
277
278	static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
279	struct fs_context *fc)
280	{
281	size_t len;
282	struct ceph_fsid fsid;
283	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
284	struct ceph_mount_options *fsopt = pctx->opts;
285	char *fsid_start, *fs_name_start;
286
287	if (*dev_name_end != '=') {
288	dout("separator '=' missing in source");
289	return -EINVAL;
290	}
291
292	fsid_start = strchr(dev_name, '@');
293	if (!fsid_start)
294	return invalfc(fc, "missing cluster fsid");
295	++fsid_start; /* start of cluster fsid */
296
297	fs_name_start = strchr(fsid_start, '.');
298	if (!fs_name_start)
299	return invalfc(fc, "missing file system name");
300
301	if (ceph_parse_fsid(str: fsid_start, fsid: &fsid))
302	return invalfc(fc, "Invalid FSID");
303
304	++fs_name_start; /* start of file system name */
305	len = dev_name_end - fs_name_start;
306
307	if (!namespace_equals(fsopt, namespace: fs_name_start, len))
308	return invalfc(fc, "Mismatching mds_namespace");
309	kfree(objp: fsopt->mds_namespace);
310	fsopt->mds_namespace = kstrndup(s: fs_name_start, len, GFP_KERNEL);
311	if (!fsopt->mds_namespace)
312	return -ENOMEM;
313	dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
314
315	fsopt->new_dev_syntax = true;
316	return 0;
317	}
318
319	/*
320	* Parse the source parameter for new device format. Distinguish the device
321	* spec from the path. Try parsing new device format and fallback to old
322	* format if needed.
323	*
324	* New device syntax will looks like:
325	* <device_spec>=/<path>
326	* where
327	* <device_spec> is name@fsid.fsname
328	* <path> is optional, but if present must begin with '/'
329	* (monitor addresses are passed via mount option)
330	*
331	* Old device syntax is:
332	* <server_spec>[,<server_spec>...]:[<path>]
333	* where
334	* <server_spec> is <ip>[:<port>]
335	* <path> is optional, but if present must begin with '/'
336	*/
337	static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
338	{
339	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
340	struct ceph_mount_options *fsopt = pctx->opts;
341	char *dev_name = param->string, *dev_name_end;
342	int ret;
343
344	dout("%s '%s'\n", __func__, dev_name);
345	if (!dev_name || !*dev_name)
346	return invalfc(fc, "Empty source");
347
348	dev_name_end = strchr(dev_name, '/');
349	if (dev_name_end) {
350	/*
351	* The server_path will include the whole chars from userland
352	* including the leading '/'.
353	*/
354	kfree(objp: fsopt->server_path);
355	fsopt->server_path = kstrdup(s: dev_name_end, GFP_KERNEL);
356	if (!fsopt->server_path)
357	return -ENOMEM;
358
359	canonicalize_path(path: fsopt->server_path);
360	} else {
361	dev_name_end = dev_name + strlen(dev_name);
362	}
363
364	dev_name_end--; /* back up to separator */
365	if (dev_name_end < dev_name)
366	return invalfc(fc, "Path missing in source");
367
368	dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
369	if (fsopt->server_path)
370	dout("server path '%s'\n", fsopt->server_path);
371
372	dout("trying new device syntax");
373	ret = ceph_parse_new_source(dev_name, dev_name_end, fc);
374	if (ret) {
375	if (ret != -EINVAL)
376	return ret;
377	dout("trying old device syntax");
378	ret = ceph_parse_old_source(dev_name, dev_name_end, fc);
379	if (ret)
380	return ret;
381	}
382
383	fc->source = param->string;
384	param->string = NULL;
385	return 0;
386	}
387
388	static int ceph_parse_mon_addr(struct fs_parameter *param,
389	struct fs_context *fc)
390	{
391	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
392	struct ceph_mount_options *fsopt = pctx->opts;
393
394	kfree(objp: fsopt->mon_addr);
395	fsopt->mon_addr = param->string;
396	param->string = NULL;
397
398	return ceph_parse_mon_ips(buf: fsopt->mon_addr, strlen(fsopt->mon_addr),
399	opt: pctx->copts, l: fc->log.log, delim: '/');
400	}
401
402	static int ceph_parse_mount_param(struct fs_context *fc,
403	struct fs_parameter *param)
404	{
405	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
406	struct ceph_mount_options *fsopt = pctx->opts;
407	struct fs_parse_result result;
408	unsigned int mode;
409	int token, ret;
410
411	ret = ceph_parse_param(param, opt: pctx->copts, l: fc->log.log);
412	if (ret != -ENOPARAM)
413	return ret;
414
415	token = fs_parse(fc, desc: ceph_mount_parameters, param, result: &result);
416	dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
417	if (token < 0)
418	return token;
419
420	switch (token) {
421	case Opt_snapdirname:
422	kfree(objp: fsopt->snapdir_name);
423	fsopt->snapdir_name = param->string;
424	param->string = NULL;
425	break;
426	case Opt_mds_namespace:
427	if (!namespace_equals(fsopt, namespace: param->string, strlen(param->string)))
428	return invalfc(fc, "Mismatching mds_namespace");
429	kfree(objp: fsopt->mds_namespace);
430	fsopt->mds_namespace = param->string;
431	param->string = NULL;
432	break;
433	case Opt_recover_session:
434	mode = result.uint_32;
435	if (mode == ceph_recover_session_no)
436	fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
437	else if (mode == ceph_recover_session_clean)
438	fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
439	else
440	BUG();
441	break;
442	case Opt_source:
443	if (fc->source)
444	return invalfc(fc, "Multiple sources specified");
445	return ceph_parse_source(param, fc);
446	case Opt_mon_addr:
447	return ceph_parse_mon_addr(param, fc);
448	case Opt_wsize:
449	if (result.uint_32 < PAGE_SIZE ||
450	result.uint_32 > CEPH_MAX_WRITE_SIZE)
451	goto out_of_range;
452	fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
453	break;
454	case Opt_rsize:
455	if (result.uint_32 < PAGE_SIZE ||
456	result.uint_32 > CEPH_MAX_READ_SIZE)
457	goto out_of_range;
458	fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
459	break;
460	case Opt_rasize:
461	fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
462	break;
463	case Opt_caps_wanted_delay_min:
464	if (result.uint_32 < 1)
465	goto out_of_range;
466	fsopt->caps_wanted_delay_min = result.uint_32;
467	break;
468	case Opt_caps_wanted_delay_max:
469	if (result.uint_32 < 1)
470	goto out_of_range;
471	fsopt->caps_wanted_delay_max = result.uint_32;
472	break;
473	case Opt_caps_max:
474	if (result.int_32 < 0)
475	goto out_of_range;
476	fsopt->caps_max = result.int_32;
477	break;
478	case Opt_readdir_max_entries:
479	if (result.uint_32 < 1)
480	goto out_of_range;
481	fsopt->max_readdir = result.uint_32;
482	break;
483	case Opt_readdir_max_bytes:
484	if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
485	goto out_of_range;
486	fsopt->max_readdir_bytes = result.uint_32;
487	break;
488	case Opt_congestion_kb:
489	if (result.uint_32 < 1024) /* at least 1M */
490	goto out_of_range;
491	fsopt->congestion_kb = result.uint_32;
492	break;
493	case Opt_dirstat:
494	if (!result.negated)
495	fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
496	else
497	fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
498	break;
499	case Opt_rbytes:
500	if (!result.negated)
501	fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
502	else
503	fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
504	break;
505	case Opt_asyncreaddir:
506	if (!result.negated)
507	fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
508	else
509	fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
510	break;
511	case Opt_dcache:
512	if (!result.negated)
513	fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
514	else
515	fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
516	break;
517	case Opt_ino32:
518	if (!result.negated)
519	fsopt->flags |= CEPH_MOUNT_OPT_INO32;
520	else
521	fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
522	break;
523
524	case Opt_fscache:
525	#ifdef CONFIG_CEPH_FSCACHE
526	kfree(objp: fsopt->fscache_uniq);
527	fsopt->fscache_uniq = NULL;
528	if (result.negated) {
529	fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
530	} else {
531	fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
532	fsopt->fscache_uniq = param->string;
533	param->string = NULL;
534	}
535	break;
536	#else
537	return invalfc(fc, "fscache support is disabled");
538	#endif
539	case Opt_poolperm:
540	if (!result.negated)
541	fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
542	else
543	fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
544	break;
545	case Opt_require_active_mds:
546	if (!result.negated)
547	fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
548	else
549	fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
550	break;
551	case Opt_quotadf:
552	if (!result.negated)
553	fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
554	else
555	fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
556	break;
557	case Opt_copyfrom:
558	if (!result.negated)
559	fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
560	else
561	fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
562	break;
563	case Opt_acl:
564	if (!result.negated) {
565	#ifdef CONFIG_CEPH_FS_POSIX_ACL
566	fc->sb_flags |= SB_POSIXACL;
567	#else
568	return invalfc(fc, "POSIX ACL support is disabled");
569	#endif
570	} else {
571	fc->sb_flags &= ~SB_POSIXACL;
572	}
573	break;
574	case Opt_wsync:
575	if (!result.negated)
576	fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
577	else
578	fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
579	break;
580	case Opt_pagecache:
581	if (result.negated)
582	fsopt->flags |= CEPH_MOUNT_OPT_NOPAGECACHE;
583	else
584	fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE;
585	break;
586	case Opt_sparseread:
587	if (result.negated)
588	fsopt->flags &= ~CEPH_MOUNT_OPT_SPARSEREAD;
589	else
590	fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
591	break;
592	case Opt_test_dummy_encryption:
593	#ifdef CONFIG_FS_ENCRYPTION
594	fscrypt_free_dummy_policy(dummy_policy: &fsopt->dummy_enc_policy);
595	ret = fscrypt_parse_test_dummy_encryption(param,
596	dummy_policy: &fsopt->dummy_enc_policy);
597	if (ret == -EINVAL) {
598	warnfc(fc, "Value of option \"%s\" is unrecognized",
599	param->key);
600	} else if (ret == -EEXIST) {
601	warnfc(fc, "Conflicting test_dummy_encryption options");
602	ret = -EINVAL;
603	}
604	#else
605	warnfc(fc,
606	"FS encryption not supported: test_dummy_encryption mount option ignored");
607	#endif
608	break;
609	default:
610	BUG();
611	}
612	return 0;
613
614	out_of_range:
615	return invalfc(fc, "%s out of range", param->key);
616	}
617
618	static void destroy_mount_options(struct ceph_mount_options *args)
619	{
620	dout("destroy_mount_options %p\n", args);
621	if (!args)
622	return;
623
624	kfree(objp: args->snapdir_name);
625	kfree(objp: args->mds_namespace);
626	kfree(objp: args->server_path);
627	kfree(objp: args->fscache_uniq);
628	kfree(objp: args->mon_addr);
629	fscrypt_free_dummy_policy(dummy_policy: &args->dummy_enc_policy);
630	kfree(objp: args);
631	}
632
633	static int strcmp_null(const char *s1, const char *s2)
634	{
635	if (!s1 && !s2)
636	return 0;
637	if (s1 && !s2)
638	return -1;
639	if (!s1 && s2)
640	return 1;
641	return strcmp(s1, s2);
642	}
643
644	static int compare_mount_options(struct ceph_mount_options *new_fsopt,
645	struct ceph_options *new_opt,
646	struct ceph_fs_client *fsc)
647	{
648	struct ceph_mount_options *fsopt1 = new_fsopt;
649	struct ceph_mount_options *fsopt2 = fsc->mount_options;
650	int ofs = offsetof(struct ceph_mount_options, snapdir_name);
651	int ret;
652
653	ret = memcmp(p: fsopt1, q: fsopt2, size: ofs);
654	if (ret)
655	return ret;
656
657	ret = strcmp_null(s1: fsopt1->snapdir_name, s2: fsopt2->snapdir_name);
658	if (ret)
659	return ret;
660
661	ret = strcmp_null(s1: fsopt1->mds_namespace, s2: fsopt2->mds_namespace);
662	if (ret)
663	return ret;
664
665	ret = strcmp_null(s1: fsopt1->server_path, s2: fsopt2->server_path);
666	if (ret)
667	return ret;
668
669	ret = strcmp_null(s1: fsopt1->fscache_uniq, s2: fsopt2->fscache_uniq);
670	if (ret)
671	return ret;
672
673	ret = strcmp_null(s1: fsopt1->mon_addr, s2: fsopt2->mon_addr);
674	if (ret)
675	return ret;
676
677	return ceph_compare_options(new_opt, client: fsc->client);
678	}
679
680	/**
681	* ceph_show_options - Show mount options in /proc/mounts
682	* @m: seq_file to write to
683	* @root: root of that (sub)tree
684	*/
685	static int ceph_show_options(struct seq_file *m, struct dentry *root)
686	{
687	struct ceph_fs_client *fsc = ceph_sb_to_client(sb: root->d_sb);
688	struct ceph_mount_options *fsopt = fsc->mount_options;
689	size_t pos;
690	int ret;
691
692	/* a comma between MNT/MS and client options */
693	seq_putc(m, c: ',');
694	pos = m->count;
695
696	ret = ceph_print_client_options(m, client: fsc->client, show_all: false);
697	if (ret)
698	return ret;
699
700	/* retract our comma if no client options */
701	if (m->count == pos)
702	m->count--;
703
704	if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
705	seq_puts(m, s: ",dirstat");
706	if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
707	seq_puts(m, s: ",rbytes");
708	if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
709	seq_puts(m, s: ",noasyncreaddir");
710	if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
711	seq_puts(m, s: ",nodcache");
712	if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
713	seq_puts(m, s: ",ino32");
714	if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
715	seq_show_option(m, name: "fsc", value: fsopt->fscache_uniq);
716	}
717	if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
718	seq_puts(m, s: ",nopoolperm");
719	if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
720	seq_puts(m, s: ",noquotadf");
721
722	#ifdef CONFIG_CEPH_FS_POSIX_ACL
723	if (root->d_sb->s_flags & SB_POSIXACL)
724	seq_puts(m, s: ",acl");
725	else
726	seq_puts(m, s: ",noacl");
727	#endif
728
729	if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
730	seq_puts(m, s: ",copyfrom");
731
732	/* dump mds_namespace when old device syntax is in use */
733	if (fsopt->mds_namespace && !fsopt->new_dev_syntax)
734	seq_show_option(m, name: "mds_namespace", value: fsopt->mds_namespace);
735
736	if (fsopt->mon_addr)
737	seq_printf(m, fmt: ",mon_addr=%s", fsopt->mon_addr);
738
739	if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
740	seq_show_option(m, name: "recover_session", value: "clean");
741
742	if (!(fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS))
743	seq_puts(m, s: ",wsync");
744	if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
745	seq_puts(m, s: ",nopagecache");
746	if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
747	seq_puts(m, s: ",sparseread");
748
749	fscrypt_show_test_dummy_encryption(seq: m, sep: ',', sb: root->d_sb);
750
751	if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
752	seq_printf(m, fmt: ",wsize=%u", fsopt->wsize);
753	if (fsopt->rsize != CEPH_MAX_READ_SIZE)
754	seq_printf(m, fmt: ",rsize=%u", fsopt->rsize);
755	if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
756	seq_printf(m, fmt: ",rasize=%u", fsopt->rasize);
757	if (fsopt->congestion_kb != default_congestion_kb())
758	seq_printf(m, fmt: ",write_congestion_kb=%u", fsopt->congestion_kb);
759	if (fsopt->caps_max)
760	seq_printf(m, fmt: ",caps_max=%d", fsopt->caps_max);
761	if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
762	seq_printf(m, fmt: ",caps_wanted_delay_min=%u",
763	fsopt->caps_wanted_delay_min);
764	if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
765	seq_printf(m, fmt: ",caps_wanted_delay_max=%u",
766	fsopt->caps_wanted_delay_max);
767	if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
768	seq_printf(m, fmt: ",readdir_max_entries=%u", fsopt->max_readdir);
769	if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
770	seq_printf(m, fmt: ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
771	if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
772	seq_show_option(m, name: "snapdirname", value: fsopt->snapdir_name);
773
774	return 0;
775	}
776
777	/*
778	* handle any mon messages the standard library doesn't understand.
779	* return error if we don't either.
780	*/
781	static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
782	{
783	struct ceph_fs_client *fsc = client->private;
784	int type = le16_to_cpu(msg->hdr.type);
785
786	switch (type) {
787	case CEPH_MSG_MDS_MAP:
788	ceph_mdsc_handle_mdsmap(mdsc: fsc->mdsc, msg);
789	return 0;
790	case CEPH_MSG_FS_MAP_USER:
791	ceph_mdsc_handle_fsmap(mdsc: fsc->mdsc, msg);
792	return 0;
793	default:
794	return -1;
795	}
796	}
797
798	/*
799	* create a new fs client
800	*
801	* Success or not, this function consumes @fsopt and @opt.
802	*/
803	static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
804	struct ceph_options *opt)
805	{
806	struct ceph_fs_client *fsc;
807	int err;
808
809	fsc = kzalloc(size: sizeof(*fsc), GFP_KERNEL);
810	if (!fsc) {
811	err = -ENOMEM;
812	goto fail;
813	}
814
815	fsc->client = ceph_create_client(opt, private: fsc);
816	if (IS_ERR(ptr: fsc->client)) {
817	err = PTR_ERR(ptr: fsc->client);
818	goto fail;
819	}
820	opt = NULL; /* fsc->client now owns this */
821
822	fsc->client->extra_mon_dispatch = extra_mon_dispatch;
823	ceph_set_opt(fsc->client, ABORT_ON_FULL);
824
825	if (!fsopt->mds_namespace) {
826	ceph_monc_want_map(monc: &fsc->client->monc, sub: CEPH_SUB_MDSMAP,
827	epoch: 0, continuous: true);
828	} else {
829	ceph_monc_want_map(monc: &fsc->client->monc, sub: CEPH_SUB_FSMAP,
830	epoch: 0, continuous: false);
831	}
832
833	fsc->mount_options = fsopt;
834
835	fsc->sb = NULL;
836	fsc->mount_state = CEPH_MOUNT_MOUNTING;
837	fsc->filp_gen = 1;
838	fsc->have_copy_from2 = true;
839
840	atomic_long_set(v: &fsc->writeback_count, i: 0);
841	fsc->write_congested = false;
842
843	err = -ENOMEM;
844	/*
845	* The number of concurrent works can be high but they don't need
846	* to be processed in parallel, limit concurrency.
847	*/
848	fsc->inode_wq = alloc_workqueue(fmt: "ceph-inode", flags: WQ_UNBOUND, max_active: 0);
849	if (!fsc->inode_wq)
850	goto fail_client;
851	fsc->cap_wq = alloc_workqueue(fmt: "ceph-cap", flags: 0, max_active: 1);
852	if (!fsc->cap_wq)
853	goto fail_inode_wq;
854
855	hash_init(fsc->async_unlink_conflict);
856	spin_lock_init(&fsc->async_unlink_conflict_lock);
857
858	spin_lock(lock: &ceph_fsc_lock);
859	list_add_tail(new: &fsc->metric_wakeup, head: &ceph_fsc_list);
860	spin_unlock(lock: &ceph_fsc_lock);
861
862	return fsc;
863
864	fail_inode_wq:
865	destroy_workqueue(wq: fsc->inode_wq);
866	fail_client:
867	ceph_destroy_client(client: fsc->client);
868	fail:
869	kfree(objp: fsc);
870	if (opt)
871	ceph_destroy_options(opt);
872	destroy_mount_options(args: fsopt);
873	return ERR_PTR(error: err);
874	}
875
876	static void flush_fs_workqueues(struct ceph_fs_client *fsc)
877	{
878	flush_workqueue(fsc->inode_wq);
879	flush_workqueue(fsc->cap_wq);
880	}
881
882	static void destroy_fs_client(struct ceph_fs_client *fsc)
883	{
884	dout("destroy_fs_client %p\n", fsc);
885
886	spin_lock(lock: &ceph_fsc_lock);
887	list_del(entry: &fsc->metric_wakeup);
888	spin_unlock(lock: &ceph_fsc_lock);
889
890	ceph_mdsc_destroy(fsc);
891	destroy_workqueue(wq: fsc->inode_wq);
892	destroy_workqueue(wq: fsc->cap_wq);
893
894	destroy_mount_options(args: fsc->mount_options);
895
896	ceph_destroy_client(client: fsc->client);
897
898	kfree(objp: fsc);
899	dout("destroy_fs_client %p done\n", fsc);
900	}
901
902	/*
903	* caches
904	*/
905	struct kmem_cache *ceph_inode_cachep;
906	struct kmem_cache *ceph_cap_cachep;
907	struct kmem_cache *ceph_cap_snap_cachep;
908	struct kmem_cache *ceph_cap_flush_cachep;
909	struct kmem_cache *ceph_dentry_cachep;
910	struct kmem_cache *ceph_file_cachep;
911	struct kmem_cache *ceph_dir_file_cachep;
912	struct kmem_cache *ceph_mds_request_cachep;
913	mempool_t *ceph_wb_pagevec_pool;
914
915	static void ceph_inode_init_once(void *foo)
916	{
917	struct ceph_inode_info *ci = foo;
918	inode_init_once(&ci->netfs.inode);
919	}
920
921	static int __init init_caches(void)
922	{
923	int error = -ENOMEM;
924
925	ceph_inode_cachep = kmem_cache_create(name: "ceph_inode_info",
926	size: sizeof(struct ceph_inode_info),
927	align: __alignof__(struct ceph_inode_info),
928	SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
929	SLAB_ACCOUNT, ctor: ceph_inode_init_once);
930	if (!ceph_inode_cachep)
931	return -ENOMEM;
932
933	ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
934	if (!ceph_cap_cachep)
935	goto bad_cap;
936	ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, SLAB_MEM_SPREAD);
937	if (!ceph_cap_snap_cachep)
938	goto bad_cap_snap;
939	ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
940	SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
941	if (!ceph_cap_flush_cachep)
942	goto bad_cap_flush;
943
944	ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
945	SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
946	if (!ceph_dentry_cachep)
947	goto bad_dentry;
948
949	ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
950	if (!ceph_file_cachep)
951	goto bad_file;
952
953	ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
954	if (!ceph_dir_file_cachep)
955	goto bad_dir_file;
956
957	ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, SLAB_MEM_SPREAD);
958	if (!ceph_mds_request_cachep)
959	goto bad_mds_req;
960
961	ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(min_nr: 10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
962	if (!ceph_wb_pagevec_pool)
963	goto bad_pagevec_pool;
964
965	return 0;
966
967	bad_pagevec_pool:
968	kmem_cache_destroy(s: ceph_mds_request_cachep);
969	bad_mds_req:
970	kmem_cache_destroy(s: ceph_dir_file_cachep);
971	bad_dir_file:
972	kmem_cache_destroy(s: ceph_file_cachep);
973	bad_file:
974	kmem_cache_destroy(s: ceph_dentry_cachep);
975	bad_dentry:
976	kmem_cache_destroy(s: ceph_cap_flush_cachep);
977	bad_cap_flush:
978	kmem_cache_destroy(s: ceph_cap_snap_cachep);
979	bad_cap_snap:
980	kmem_cache_destroy(s: ceph_cap_cachep);
981	bad_cap:
982	kmem_cache_destroy(s: ceph_inode_cachep);
983	return error;
984	}
985
986	static void destroy_caches(void)
987	{
988	/*
989	* Make sure all delayed rcu free inodes are flushed before we
990	* destroy cache.
991	*/
992	rcu_barrier();
993
994	kmem_cache_destroy(s: ceph_inode_cachep);
995	kmem_cache_destroy(s: ceph_cap_cachep);
996	kmem_cache_destroy(s: ceph_cap_snap_cachep);
997	kmem_cache_destroy(s: ceph_cap_flush_cachep);
998	kmem_cache_destroy(s: ceph_dentry_cachep);
999	kmem_cache_destroy(s: ceph_file_cachep);
1000	kmem_cache_destroy(s: ceph_dir_file_cachep);
1001	kmem_cache_destroy(s: ceph_mds_request_cachep);
1002	mempool_destroy(pool: ceph_wb_pagevec_pool);
1003	}
1004
1005	static void __ceph_umount_begin(struct ceph_fs_client *fsc)
1006	{
1007	ceph_osdc_abort_requests(osdc: &fsc->client->osdc, err: -EIO);
1008	ceph_mdsc_force_umount(mdsc: fsc->mdsc);
1009	fsc->filp_gen++; // invalidate open files
1010	}
1011
1012	/*
1013	* ceph_umount_begin - initiate forced umount. Tear down the
1014	* mount, skipping steps that may hang while waiting for server(s).
1015	*/
1016	void ceph_umount_begin(struct super_block *sb)
1017	{
1018	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1019
1020	dout("ceph_umount_begin - starting forced umount\n");
1021	if (!fsc)
1022	return;
1023	fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
1024	__ceph_umount_begin(fsc);
1025	}
1026
1027	static const struct super_operations ceph_super_ops = {
1028	.alloc_inode = ceph_alloc_inode,
1029	.free_inode = ceph_free_inode,
1030	.write_inode = ceph_write_inode,
1031	.drop_inode = generic_delete_inode,
1032	.evict_inode = ceph_evict_inode,
1033	.sync_fs = ceph_sync_fs,
1034	.put_super = ceph_put_super,
1035	.show_options = ceph_show_options,
1036	.statfs = ceph_statfs,
1037	.umount_begin = ceph_umount_begin,
1038	};
1039
1040	/*
1041	* Bootstrap mount by opening the root directory. Note the mount
1042	* @started time from caller, and time out if this takes too long.
1043	*/
1044	static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
1045	const char *path,
1046	unsigned long started)
1047	{
1048	struct ceph_mds_client *mdsc = fsc->mdsc;
1049	struct ceph_mds_request *req = NULL;
1050	int err;
1051	struct dentry *root;
1052
1053	/* open dir */
1054	dout("open_root_inode opening '%s'\n", path);
1055	req = ceph_mdsc_create_request(mdsc, op: CEPH_MDS_OP_GETATTR, mode: USE_ANY_MDS);
1056	if (IS_ERR(ptr: req))
1057	return ERR_CAST(ptr: req);
1058	req->r_path1 = kstrdup(s: path, GFP_NOFS);
1059	if (!req->r_path1) {
1060	root = ERR_PTR(error: -ENOMEM);
1061	goto out;
1062	}
1063
1064	req->r_ino1.ino = CEPH_INO_ROOT;
1065	req->r_ino1.snap = CEPH_NOSNAP;
1066	req->r_started = started;
1067	req->r_timeout = fsc->client->options->mount_timeout;
1068	req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
1069	req->r_num_caps = 2;
1070	err = ceph_mdsc_do_request(mdsc, NULL, req);
1071	if (err == 0) {
1072	struct inode *inode = req->r_target_inode;
1073	req->r_target_inode = NULL;
1074	dout("open_root_inode success\n");
1075	root = d_make_root(inode);
1076	if (!root) {
1077	root = ERR_PTR(error: -ENOMEM);
1078	goto out;
1079	}
1080	dout("open_root_inode success, root dentry is %p\n", root);
1081	} else {
1082	root = ERR_PTR(error: err);
1083	}
1084	out:
1085	ceph_mdsc_put_request(req);
1086	return root;
1087	}
1088
1089	#ifdef CONFIG_FS_ENCRYPTION
1090	static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1091	struct fs_context *fc,
1092	struct ceph_mount_options *fsopt)
1093	{
1094	struct ceph_fs_client *fsc = sb->s_fs_info;
1095
1096	if (!fscrypt_is_dummy_policy_set(dummy_policy: &fsopt->dummy_enc_policy))
1097	return 0;
1098
1099	/* No changing encryption context on remount. */
1100	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
1101	!fscrypt_is_dummy_policy_set(dummy_policy: &fsc->fsc_dummy_enc_policy)) {
1102	if (fscrypt_dummy_policies_equal(p1: &fsopt->dummy_enc_policy,
1103	p2: &fsc->fsc_dummy_enc_policy))
1104	return 0;
1105	errorfc(fc, "Can't set test_dummy_encryption on remount");
1106	return -EINVAL;
1107	}
1108
1109	/* Also make sure fsopt doesn't contain a conflicting value. */
1110	if (fscrypt_is_dummy_policy_set(dummy_policy: &fsc->fsc_dummy_enc_policy)) {
1111	if (fscrypt_dummy_policies_equal(p1: &fsopt->dummy_enc_policy,
1112	p2: &fsc->fsc_dummy_enc_policy))
1113	return 0;
1114	errorfc(fc, "Conflicting test_dummy_encryption options");
1115	return -EINVAL;
1116	}
1117
1118	fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
1119	memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
1120
1121	warnfc(fc, "test_dummy_encryption mode enabled");
1122	return 0;
1123	}
1124	#else
1125	static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1126	struct fs_context *fc,
1127	struct ceph_mount_options *fsopt)
1128	{
1129	return 0;
1130	}
1131	#endif
1132
1133	/*
1134	* mount: join the ceph cluster, and open root directory.
1135	*/
1136	static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
1137	struct fs_context *fc)
1138	{
1139	int err;
1140	unsigned long started = jiffies; /* note the start time */
1141	struct dentry *root;
1142
1143	dout("mount start %p\n", fsc);
1144	mutex_lock(&fsc->client->mount_mutex);
1145
1146	if (!fsc->sb->s_root) {
1147	const char *path = fsc->mount_options->server_path ?
1148	fsc->mount_options->server_path + 1 : "";
1149
1150	err = __ceph_open_session(client: fsc->client, started);
1151	if (err < 0)
1152	goto out;
1153
1154	/* setup fscache */
1155	if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
1156	err = ceph_fscache_register_fs(fsc, fc);
1157	if (err < 0)
1158	goto out;
1159	}
1160
1161	err = ceph_apply_test_dummy_encryption(sb: fsc->sb, fc,
1162	fsopt: fsc->mount_options);
1163	if (err)
1164	goto out;
1165
1166	dout("mount opening path '%s'\n", path);
1167
1168	ceph_fs_debugfs_init(client: fsc);
1169
1170	root = open_root_dentry(fsc, path, started);
1171	if (IS_ERR(ptr: root)) {
1172	err = PTR_ERR(ptr: root);
1173	goto out;
1174	}
1175	fsc->sb->s_root = dget(dentry: root);
1176	} else {
1177	root = dget(dentry: fsc->sb->s_root);
1178	}
1179
1180	fsc->mount_state = CEPH_MOUNT_MOUNTED;
1181	dout("mount success\n");
1182	mutex_unlock(lock: &fsc->client->mount_mutex);
1183	return root;
1184
1185	out:
1186	mutex_unlock(lock: &fsc->client->mount_mutex);
1187	ceph_fscrypt_free_dummy_policy(fsc);
1188	return ERR_PTR(error: err);
1189	}
1190
1191	static int ceph_set_super(struct super_block *s, struct fs_context *fc)
1192	{
1193	struct ceph_fs_client *fsc = s->s_fs_info;
1194	int ret;
1195
1196	dout("set_super %p\n", s);
1197
1198	s->s_maxbytes = MAX_LFS_FILESIZE;
1199
1200	s->s_xattr = ceph_xattr_handlers;
1201	fsc->sb = s;
1202	fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1203
1204	s->s_op = &ceph_super_ops;
1205	s->s_d_op = &ceph_dentry_ops;
1206	s->s_export_op = &ceph_export_ops;
1207
1208	s->s_time_gran = 1;
1209	s->s_time_min = 0;
1210	s->s_time_max = U32_MAX;
1211	s->s_flags |= SB_NODIRATIME | SB_NOATIME;
1212
1213	ceph_fscrypt_set_ops(sb: s);
1214
1215	ret = set_anon_super_fc(s, fc);
1216	if (ret != 0)
1217	fsc->sb = NULL;
1218	return ret;
1219	}
1220
1221	/*
1222	* share superblock if same fs AND options
1223	*/
1224	static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1225	{
1226	struct ceph_fs_client *new = fc->s_fs_info;
1227	struct ceph_mount_options *fsopt = new->mount_options;
1228	struct ceph_options *opt = new->client->options;
1229	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1230
1231	dout("ceph_compare_super %p\n", sb);
1232
1233	if (compare_mount_options(new_fsopt: fsopt, new_opt: opt, fsc)) {
1234	dout("monitor(s)/mount options don't match\n");
1235	return 0;
1236	}
1237	if ((opt->flags & CEPH_OPT_FSID) &&
1238	ceph_fsid_compare(a: &opt->fsid, b: &fsc->client->fsid)) {
1239	dout("fsid doesn't match\n");
1240	return 0;
1241	}
1242	if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1243	dout("flags differ\n");
1244	return 0;
1245	}
1246
1247	if (fsc->blocklisted && !ceph_test_mount_opt(fsc, CLEANRECOVER)) {
1248	dout("client is blocklisted (and CLEANRECOVER is not set)\n");
1249	return 0;
1250	}
1251
1252	if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
1253	dout("client has been forcibly unmounted\n");
1254	return 0;
1255	}
1256
1257	return 1;
1258	}
1259
1260	/*
1261	* construct our own bdi so we can control readahead, etc.
1262	*/
1263	static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1264
1265	static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1266	{
1267	int err;
1268
1269	err = super_setup_bdi_name(sb, fmt: "ceph-%ld",
1270	atomic_long_inc_return(v: &bdi_seq));
1271	if (err)
1272	return err;
1273
1274	/* set ra_pages based on rasize mount option? */
1275	sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1276
1277	/* set io_pages based on max osd read size */
1278	sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1279
1280	return 0;
1281	}
1282
1283	static int ceph_get_tree(struct fs_context *fc)
1284	{
1285	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1286	struct ceph_mount_options *fsopt = pctx->opts;
1287	struct super_block *sb;
1288	struct ceph_fs_client *fsc;
1289	struct dentry *res;
1290	int (*compare_super)(struct super_block *, struct fs_context *) =
1291	ceph_compare_super;
1292	int err;
1293
1294	dout("ceph_get_tree\n");
1295
1296	if (!fc->source)
1297	return invalfc(fc, "No source");
1298	if (fsopt->new_dev_syntax && !fsopt->mon_addr)
1299	return invalfc(fc, "No monitor address");
1300
1301	/* create client (which we may/may not use) */
1302	fsc = create_fs_client(fsopt: pctx->opts, opt: pctx->copts);
1303	pctx->opts = NULL;
1304	pctx->copts = NULL;
1305	if (IS_ERR(ptr: fsc)) {
1306	err = PTR_ERR(ptr: fsc);
1307	goto out_final;
1308	}
1309
1310	err = ceph_mdsc_init(fsc);
1311	if (err < 0)
1312	goto out;
1313
1314	if (ceph_test_opt(fsc->client, NOSHARE))
1315	compare_super = NULL;
1316
1317	fc->s_fs_info = fsc;
1318	sb = sget_fc(fc, test: compare_super, set: ceph_set_super);
1319	fc->s_fs_info = NULL;
1320	if (IS_ERR(ptr: sb)) {
1321	err = PTR_ERR(ptr: sb);
1322	goto out;
1323	}
1324
1325	if (ceph_sb_to_client(sb) != fsc) {
1326	destroy_fs_client(fsc);
1327	fsc = ceph_sb_to_client(sb);
1328	dout("get_sb got existing client %p\n", fsc);
1329	} else {
1330	dout("get_sb using new client %p\n", fsc);
1331	err = ceph_setup_bdi(sb, fsc);
1332	if (err < 0)
1333	goto out_splat;
1334	}
1335
1336	res = ceph_real_mount(fsc, fc);
1337	if (IS_ERR(ptr: res)) {
1338	err = PTR_ERR(ptr: res);
1339	goto out_splat;
1340	}
1341	dout("root %p inode %p ino %llx.%llx\n", res,
1342	d_inode(res), ceph_vinop(d_inode(res)));
1343	fc->root = fsc->sb->s_root;
1344	return 0;
1345
1346	out_splat:
1347	if (!ceph_mdsmap_is_cluster_available(m: fsc->mdsc->mdsmap)) {
1348	pr_info("No mds server is up or the cluster is laggy\n");
1349	err = -EHOSTUNREACH;
1350	}
1351
1352	ceph_mdsc_close_sessions(mdsc: fsc->mdsc);
1353	deactivate_locked_super(sb);
1354	goto out_final;
1355
1356	out:
1357	destroy_fs_client(fsc);
1358	out_final:
1359	dout("ceph_get_tree fail %d\n", err);
1360	return err;
1361	}
1362
1363	static void ceph_free_fc(struct fs_context *fc)
1364	{
1365	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1366
1367	if (pctx) {
1368	destroy_mount_options(args: pctx->opts);
1369	ceph_destroy_options(opt: pctx->copts);
1370	kfree(objp: pctx);
1371	}
1372	}
1373
1374	static int ceph_reconfigure_fc(struct fs_context *fc)
1375	{
1376	int err;
1377	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1378	struct ceph_mount_options *fsopt = pctx->opts;
1379	struct super_block *sb = fc->root->d_sb;
1380	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1381
1382	err = ceph_apply_test_dummy_encryption(sb, fc, fsopt);
1383	if (err)
1384	return err;
1385
1386	if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1387	ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1388	else
1389	ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1390
1391	if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
1392	ceph_set_mount_opt(fsc, SPARSEREAD);
1393	else
1394	ceph_clear_mount_opt(fsc, SPARSEREAD);
1395
1396	if (strcmp_null(s1: fsc->mount_options->mon_addr, s2: fsopt->mon_addr)) {
1397	kfree(objp: fsc->mount_options->mon_addr);
1398	fsc->mount_options->mon_addr = fsopt->mon_addr;
1399	fsopt->mon_addr = NULL;
1400	pr_notice("ceph: monitor addresses recorded, but not used for reconnection");
1401	}
1402
1403	sync_filesystem(sb);
1404	return 0;
1405	}
1406
1407	static const struct fs_context_operations ceph_context_ops = {
1408	.free = ceph_free_fc,
1409	.parse_param = ceph_parse_mount_param,
1410	.get_tree = ceph_get_tree,
1411	.reconfigure = ceph_reconfigure_fc,
1412	};
1413
1414	/*
1415	* Set up the filesystem mount context.
1416	*/
1417	static int ceph_init_fs_context(struct fs_context *fc)
1418	{
1419	struct ceph_parse_opts_ctx *pctx;
1420	struct ceph_mount_options *fsopt;
1421
1422	pctx = kzalloc(size: sizeof(*pctx), GFP_KERNEL);
1423	if (!pctx)
1424	return -ENOMEM;
1425
1426	pctx->copts = ceph_alloc_options();
1427	if (!pctx->copts)
1428	goto nomem;
1429
1430	pctx->opts = kzalloc(size: sizeof(*pctx->opts), GFP_KERNEL);
1431	if (!pctx->opts)
1432	goto nomem;
1433
1434	fsopt = pctx->opts;
1435	fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1436
1437	fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1438	fsopt->rsize = CEPH_MAX_READ_SIZE;
1439	fsopt->rasize = CEPH_RASIZE_DEFAULT;
1440	fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1441	if (!fsopt->snapdir_name)
1442	goto nomem;
1443
1444	fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1445	fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1446	fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1447	fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1448	fsopt->congestion_kb = default_congestion_kb();
1449
1450	#ifdef CONFIG_CEPH_FS_POSIX_ACL
1451	fc->sb_flags |= SB_POSIXACL;
1452	#endif
1453
1454	fc->fs_private = pctx;
1455	fc->ops = &ceph_context_ops;
1456	return 0;
1457
1458	nomem:
1459	destroy_mount_options(args: pctx->opts);
1460	ceph_destroy_options(opt: pctx->copts);
1461	kfree(objp: pctx);
1462	return -ENOMEM;
1463	}
1464
1465	/*
1466	* Return true if it successfully increases the blocker counter,
1467	* or false if the mdsc is in stopping and flushed state.
1468	*/
1469	static bool __inc_stopping_blocker(struct ceph_mds_client *mdsc)
1470	{
1471	spin_lock(lock: &mdsc->stopping_lock);
1472	if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING) {
1473	spin_unlock(lock: &mdsc->stopping_lock);
1474	return false;
1475	}
1476	atomic_inc(v: &mdsc->stopping_blockers);
1477	spin_unlock(lock: &mdsc->stopping_lock);
1478	return true;
1479	}
1480
1481	static void __dec_stopping_blocker(struct ceph_mds_client *mdsc)
1482	{
1483	spin_lock(lock: &mdsc->stopping_lock);
1484	if (!atomic_dec_return(v: &mdsc->stopping_blockers) &&
1485	mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING)
1486	complete_all(&mdsc->stopping_waiter);
1487	spin_unlock(lock: &mdsc->stopping_lock);
1488	}
1489
1490	/* For metadata IO requests */
1491	bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc,
1492	struct ceph_mds_session *session)
1493	{
1494	mutex_lock(&session->s_mutex);
1495	inc_session_sequence(s: session);
1496	mutex_unlock(lock: &session->s_mutex);
1497
1498	return __inc_stopping_blocker(mdsc);
1499	}
1500
1501	void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc)
1502	{
1503	__dec_stopping_blocker(mdsc);
1504	}
1505
1506	/* For data IO requests */
1507	bool ceph_inc_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1508	{
1509	return __inc_stopping_blocker(mdsc);
1510	}
1511
1512	void ceph_dec_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1513	{
1514	__dec_stopping_blocker(mdsc);
1515	}
1516
1517	static void ceph_kill_sb(struct super_block *s)
1518	{
1519	struct ceph_fs_client *fsc = ceph_sb_to_client(sb: s);
1520	struct ceph_mds_client *mdsc = fsc->mdsc;
1521	bool wait;
1522
1523	dout("kill_sb %p\n", s);
1524
1525	ceph_mdsc_pre_umount(mdsc);
1526	flush_fs_workqueues(fsc);
1527
1528	/*
1529	* Though the kill_anon_super() will finally trigger the
1530	* sync_filesystem() anyway, we still need to do it here and
1531	* then bump the stage of shutdown. This will allow us to
1532	* drop any further message, which will increase the inodes'
1533	* i_count reference counters but makes no sense any more,
1534	* from MDSs.
1535	*
1536	* Without this when evicting the inodes it may fail in the
1537	* kill_anon_super(), which will trigger a warning when
1538	* destroying the fscrypt keyring and then possibly trigger
1539	* a further crash in ceph module when the iput() tries to
1540	* evict the inodes later.
1541	*/
1542	sync_filesystem(s);
1543
1544	spin_lock(lock: &mdsc->stopping_lock);
1545	mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHING;
1546	wait = !!atomic_read(v: &mdsc->stopping_blockers);
1547	spin_unlock(lock: &mdsc->stopping_lock);
1548
1549	if (wait && atomic_read(v: &mdsc->stopping_blockers)) {
1550	long timeleft = wait_for_completion_killable_timeout(
1551	x: &mdsc->stopping_waiter,
1552	timeout: fsc->client->options->mount_timeout);
1553	if (!timeleft) /* timed out */
1554	pr_warn("umount timed out, %ld\n", timeleft);
1555	else if (timeleft < 0) /* killed */
1556	pr_warn("umount was killed, %ld\n", timeleft);
1557	}
1558
1559	mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHED;
1560	kill_anon_super(sb: s);
1561
1562	fsc->client->extra_mon_dispatch = NULL;
1563	ceph_fs_debugfs_cleanup(client: fsc);
1564
1565	ceph_fscache_unregister_fs(fsc);
1566
1567	destroy_fs_client(fsc);
1568	}
1569
1570	static struct file_system_type ceph_fs_type = {
1571	.owner = THIS_MODULE,
1572	.name = "ceph",
1573	.init_fs_context = ceph_init_fs_context,
1574	.kill_sb = ceph_kill_sb,
1575	.fs_flags = FS_RENAME_DOES_D_MOVE,
1576	};
1577	MODULE_ALIAS_FS("ceph");
1578
1579	int ceph_force_reconnect(struct super_block *sb)
1580	{
1581	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1582	int err = 0;
1583
1584	fsc->mount_state = CEPH_MOUNT_RECOVER;
1585	__ceph_umount_begin(fsc);
1586
1587	/* Make sure all page caches get invalidated.
1588	* see remove_session_caps_cb() */
1589	flush_workqueue(fsc->inode_wq);
1590
1591	/* In case that we were blocklisted. This also reset
1592	* all mon/osd connections */
1593	ceph_reset_client_addr(client: fsc->client);
1594
1595	ceph_osdc_clear_abort_err(osdc: &fsc->client->osdc);
1596
1597	fsc->blocklisted = false;
1598	fsc->mount_state = CEPH_MOUNT_MOUNTED;
1599
1600	if (sb->s_root) {
1601	err = __ceph_do_getattr(inode: d_inode(dentry: sb->s_root), NULL,
1602	CEPH_STAT_CAP_INODE, force: true);
1603	}
1604	return err;
1605	}
1606
1607	static int __init init_ceph(void)
1608	{
1609	int ret = init_caches();
1610	if (ret)
1611	goto out;
1612
1613	ceph_flock_init();
1614	ret = register_filesystem(&ceph_fs_type);
1615	if (ret)
1616	goto out_caches;
1617
1618	pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1619
1620	return 0;
1621
1622	out_caches:
1623	destroy_caches();
1624	out:
1625	return ret;
1626	}
1627
1628	static void __exit exit_ceph(void)
1629	{
1630	dout("exit_ceph\n");
1631	unregister_filesystem(&ceph_fs_type);
1632	destroy_caches();
1633	}
1634
1635	static int param_set_metrics(const char *val, const struct kernel_param *kp)
1636	{
1637	struct ceph_fs_client *fsc;
1638	int ret;
1639
1640	ret = param_set_bool(val, kp);
1641	if (ret) {
1642	pr_err("Failed to parse sending metrics switch value '%s'\n",
1643	val);
1644	return ret;
1645	} else if (!disable_send_metrics) {
1646	// wake up all the mds clients
1647	spin_lock(lock: &ceph_fsc_lock);
1648	list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1649	metric_schedule_delayed(m: &fsc->mdsc->metric);
1650	}
1651	spin_unlock(lock: &ceph_fsc_lock);
1652	}
1653
1654	return 0;
1655	}
1656
1657	static const struct kernel_param_ops param_ops_metrics = {
1658	.set = param_set_metrics,
1659	.get = param_get_bool,
1660	};
1661
1662	bool disable_send_metrics = false;
1663	module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
1664	MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1665
1666	/* for both v1 and v2 syntax */
1667	static bool mount_support = true;
1668	static const struct kernel_param_ops param_ops_mount_syntax = {
1669	.get = param_get_bool,
1670	};
1671	module_param_cb(mount_syntax_v1, &param_ops_mount_syntax, &mount_support, 0444);
1672	module_param_cb(mount_syntax_v2, &param_ops_mount_syntax, &mount_support, 0444);
1673
1674	module_init(init_ceph);
1675	module_exit(exit_ceph);
1676
1677	MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1678	MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1679	MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1680	MODULE_DESCRIPTION("Ceph filesystem for Linux");
1681	MODULE_LICENSE("GPL");
1682