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Michael Holzheu24bbb1f2006-06-23 02:05:06 -07001/*
Michael Holzheu24bbb1f2006-06-23 02:05:06 -07002 * Hypervisor filesystem for Linux on s390.
3 *
Michael Holzheuf55495b2008-12-25 13:39:39 +01004 * Copyright IBM Corp. 2006, 2008
Michael Holzheu24bbb1f2006-06-23 02:05:06 -07005 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
6 */
7
Michael Holzheuf55495b2008-12-25 13:39:39 +01008#define KMSG_COMPONENT "hypfs"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070011#include <linux/types.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/namei.h>
15#include <linux/vfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070017#include <linux/pagemap.h>
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070018#include <linux/time.h>
19#include <linux/parser.h>
20#include <linux/sysfs.h>
21#include <linux/module.h>
Michael Holzheub01af5b2007-08-10 14:32:27 +020022#include <linux/seq_file.h>
23#include <linux/mount.h>
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070024#include <asm/ebcdic.h>
25#include "hypfs.h"
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070026
27#define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */
28#define TMP_SIZE 64 /* size of temporary buffers */
29
30static struct dentry *hypfs_create_update_file(struct super_block *sb,
31 struct dentry *dir);
32
33struct hypfs_sb_info {
Eric W. Biederman6a62a212012-08-07 03:47:41 -070034 kuid_t uid; /* uid used for files and dirs */
35 kgid_t gid; /* gid used for files and dirs */
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070036 struct dentry *update_file; /* file to trigger update */
37 time_t last_update; /* last update time in secs since 1970 */
38 struct mutex lock; /* lock to protect update process */
39};
40
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -080041static const struct file_operations hypfs_file_ops;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070042static struct file_system_type hypfs_type;
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070043static const struct super_operations hypfs_s_ops;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070044
45/* start of list of all dentries, which have to be deleted on update */
46static struct dentry *hypfs_last_dentry;
47
48static void hypfs_update_update(struct super_block *sb)
49{
50 struct hypfs_sb_info *sb_info = sb->s_fs_info;
51 struct inode *inode = sb_info->update_file->d_inode;
52
53 sb_info->last_update = get_seconds();
54 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
55}
56
57/* directory tree removal functions */
58
59static void hypfs_add_dentry(struct dentry *dentry)
60{
61 dentry->d_fsdata = hypfs_last_dentry;
62 hypfs_last_dentry = dentry;
63}
64
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020065static inline int hypfs_positive(struct dentry *dentry)
66{
67 return dentry->d_inode && !d_unhashed(dentry);
68}
69
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070070static void hypfs_remove(struct dentry *dentry)
71{
72 struct dentry *parent;
73
74 parent = dentry->d_parent;
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020075 mutex_lock(&parent->d_inode->i_mutex);
76 if (hypfs_positive(dentry)) {
77 if (S_ISDIR(dentry->d_inode->i_mode))
78 simple_rmdir(parent->d_inode, dentry);
79 else
80 simple_unlink(parent->d_inode, dentry);
81 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070082 d_delete(dentry);
83 dput(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020084 mutex_unlock(&parent->d_inode->i_mutex);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070085}
86
87static void hypfs_delete_tree(struct dentry *root)
88{
89 while (hypfs_last_dentry) {
90 struct dentry *next_dentry;
91 next_dentry = hypfs_last_dentry->d_fsdata;
92 hypfs_remove(hypfs_last_dentry);
93 hypfs_last_dentry = next_dentry;
94 }
95}
96
Al Virofec0eba2011-07-24 23:30:19 -040097static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070098{
99 struct inode *ret = new_inode(sb);
100
101 if (ret) {
102 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
Michael Holzheuc960bec2012-06-29 14:48:09 +0200103 ret->i_ino = get_next_ino();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700104 ret->i_mode = mode;
105 ret->i_uid = hypfs_info->uid;
106 ret->i_gid = hypfs_info->gid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700107 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
Al Virofec0eba2011-07-24 23:30:19 -0400108 if (S_ISDIR(mode))
Miklos Szeredibfe86842011-10-28 14:13:29 +0200109 set_nlink(ret, 2);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700110 }
111 return ret;
112}
113
Al Virob69257f2010-06-04 21:02:59 -0400114static void hypfs_evict_inode(struct inode *inode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700115{
Jan Karadbd57682012-05-03 14:48:02 +0200116 clear_inode(inode);
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700117 kfree(inode->i_private);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700118}
119
120static int hypfs_open(struct inode *inode, struct file *filp)
121{
Al Viro496ad9a2013-01-23 17:07:38 -0500122 char *data = file_inode(filp)->i_private;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700123 struct hypfs_sb_info *fs_info;
124
125 if (filp->f_mode & FMODE_WRITE) {
126 if (!(inode->i_mode & S_IWUGO))
127 return -EACCES;
128 }
129 if (filp->f_mode & FMODE_READ) {
130 if (!(inode->i_mode & S_IRUGO))
131 return -EACCES;
132 }
133
134 fs_info = inode->i_sb->s_fs_info;
135 if(data) {
136 mutex_lock(&fs_info->lock);
137 filp->private_data = kstrdup(data, GFP_KERNEL);
138 if (!filp->private_data) {
139 mutex_unlock(&fs_info->lock);
140 return -ENOMEM;
141 }
142 mutex_unlock(&fs_info->lock);
143 }
Martin Schwidefsky58ea91c2010-05-17 10:00:07 +0200144 return nonseekable_open(inode, filp);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700145}
146
Badari Pulavarty027445c2006-09-30 23:28:46 -0700147static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov,
148 unsigned long nr_segs, loff_t offset)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700149{
150 char *data;
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200151 ssize_t ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700152 struct file *filp = iocb->ki_filp;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700153 /* XXX: temporary */
154 char __user *buf = iov[0].iov_base;
155 size_t count = iov[0].iov_len;
156
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200157 if (nr_segs != 1)
158 return -EINVAL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700159
160 data = filp->private_data;
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200161 ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data));
162 if (ret <= 0)
163 return ret;
164
165 iocb->ki_pos += ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700166 file_accessed(filp);
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200167
168 return ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700169}
Badari Pulavarty027445c2006-09-30 23:28:46 -0700170static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov,
171 unsigned long nr_segs, loff_t offset)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700172{
173 int rc;
Al Viro6131ffa2013-02-27 16:59:05 -0500174 struct super_block *sb = file_inode(iocb->ki_filp)->i_sb;
175 struct hypfs_sb_info *fs_info = sb->s_fs_info;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700176 size_t count = iov_length(iov, nr_segs);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700177
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700178 /*
179 * Currently we only allow one update per second for two reasons:
180 * 1. diag 204 is VERY expensive
181 * 2. If several processes do updates in parallel and then read the
182 * hypfs data, the likelihood of collisions is reduced, if we restrict
183 * the minimum update interval. A collision occurs, if during the
184 * data gathering of one process another process triggers an update
185 * If the first process wants to ensure consistent data, it has
186 * to restart data collection in this case.
187 */
188 mutex_lock(&fs_info->lock);
189 if (fs_info->last_update == get_seconds()) {
190 rc = -EBUSY;
191 goto out;
192 }
193 hypfs_delete_tree(sb->s_root);
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100194 if (MACHINE_IS_VM)
195 rc = hypfs_vm_create_files(sb, sb->s_root);
196 else
197 rc = hypfs_diag_create_files(sb, sb->s_root);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700198 if (rc) {
Michael Holzheuf55495b2008-12-25 13:39:39 +0100199 pr_err("Updating the hypfs tree failed\n");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700200 hypfs_delete_tree(sb->s_root);
201 goto out;
202 }
203 hypfs_update_update(sb);
204 rc = count;
205out:
206 mutex_unlock(&fs_info->lock);
207 return rc;
208}
209
210static int hypfs_release(struct inode *inode, struct file *filp)
211{
212 kfree(filp->private_data);
213 return 0;
214}
215
216enum { opt_uid, opt_gid, opt_err };
217
Steven Whitehousea447c092008-10-13 10:46:57 +0100218static const match_table_t hypfs_tokens = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700219 {opt_uid, "uid=%u"},
220 {opt_gid, "gid=%u"},
221 {opt_err, NULL}
222};
223
224static int hypfs_parse_options(char *options, struct super_block *sb)
225{
226 char *str;
227 substring_t args[MAX_OPT_ARGS];
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700228 kuid_t uid;
229 kgid_t gid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700230
231 if (!options)
232 return 0;
233 while ((str = strsep(&options, ",")) != NULL) {
234 int token, option;
235 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
236
237 if (!*str)
238 continue;
239 token = match_token(str, hypfs_tokens, args);
240 switch (token) {
241 case opt_uid:
242 if (match_int(&args[0], &option))
243 return -EINVAL;
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700244 uid = make_kuid(current_user_ns(), option);
245 if (!uid_valid(uid))
246 return -EINVAL;
247 hypfs_info->uid = uid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700248 break;
249 case opt_gid:
250 if (match_int(&args[0], &option))
251 return -EINVAL;
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700252 gid = make_kgid(current_user_ns(), option);
253 if (!gid_valid(gid))
254 return -EINVAL;
255 hypfs_info->gid = gid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700256 break;
257 case opt_err:
258 default:
Michael Holzheuf55495b2008-12-25 13:39:39 +0100259 pr_err("%s is not a valid mount option\n", str);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700260 return -EINVAL;
261 }
262 }
263 return 0;
264}
265
Al Viro34c80b12011-12-08 21:32:45 -0500266static int hypfs_show_options(struct seq_file *s, struct dentry *root)
Michael Holzheub01af5b2007-08-10 14:32:27 +0200267{
Al Viro34c80b12011-12-08 21:32:45 -0500268 struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info;
Michael Holzheub01af5b2007-08-10 14:32:27 +0200269
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700270 seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid));
271 seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid));
Michael Holzheub01af5b2007-08-10 14:32:27 +0200272 return 0;
273}
274
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700275static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
276{
277 struct inode *root_inode;
278 struct dentry *root_dentry;
279 int rc = 0;
280 struct hypfs_sb_info *sbi;
281
282 sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
283 if (!sbi)
284 return -ENOMEM;
285 mutex_init(&sbi->lock);
David Howellse5423702008-11-14 10:38:39 +1100286 sbi->uid = current_uid();
287 sbi->gid = current_gid();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700288 sb->s_fs_info = sbi;
289 sb->s_blocksize = PAGE_CACHE_SIZE;
290 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
291 sb->s_magic = HYPFS_MAGIC;
292 sb->s_op = &hypfs_s_ops;
Al Virof1771ff2010-01-25 18:36:07 -0500293 if (hypfs_parse_options(data, sb))
294 return -EINVAL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700295 root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
Al Virof1771ff2010-01-25 18:36:07 -0500296 if (!root_inode)
297 return -ENOMEM;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700298 root_inode->i_op = &simple_dir_inode_operations;
299 root_inode->i_fop = &simple_dir_operations;
Al Viro48fde702012-01-08 22:15:13 -0500300 sb->s_root = root_dentry = d_make_root(root_inode);
301 if (!root_dentry)
Al Virof1771ff2010-01-25 18:36:07 -0500302 return -ENOMEM;
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100303 if (MACHINE_IS_VM)
304 rc = hypfs_vm_create_files(sb, root_dentry);
305 else
306 rc = hypfs_diag_create_files(sb, root_dentry);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700307 if (rc)
Al Virof1771ff2010-01-25 18:36:07 -0500308 return rc;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700309 sbi->update_file = hypfs_create_update_file(sb, root_dentry);
Al Virof1771ff2010-01-25 18:36:07 -0500310 if (IS_ERR(sbi->update_file))
311 return PTR_ERR(sbi->update_file);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700312 hypfs_update_update(sb);
Michael Holzheuf55495b2008-12-25 13:39:39 +0100313 pr_info("Hypervisor filesystem mounted\n");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700314 return 0;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700315}
316
Al Virofc14f2f2010-07-25 01:48:30 +0400317static struct dentry *hypfs_mount(struct file_system_type *fst, int flags,
318 const char *devname, void *data)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700319{
Al Virofc14f2f2010-07-25 01:48:30 +0400320 return mount_single(fst, flags, data, hypfs_fill_super);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700321}
322
323static void hypfs_kill_super(struct super_block *sb)
324{
325 struct hypfs_sb_info *sb_info = sb->s_fs_info;
326
Al Virof1771ff2010-01-25 18:36:07 -0500327 if (sb->s_root)
Michael Holzheu388c5712006-09-20 16:00:04 +0200328 hypfs_delete_tree(sb->s_root);
Al Virof1771ff2010-01-25 18:36:07 -0500329 if (sb_info->update_file)
Michael Holzheu388c5712006-09-20 16:00:04 +0200330 hypfs_remove(sb_info->update_file);
Al Virof1771ff2010-01-25 18:36:07 -0500331 kfree(sb->s_fs_info);
332 sb->s_fs_info = NULL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700333 kill_litter_super(sb);
334}
335
336static struct dentry *hypfs_create_file(struct super_block *sb,
337 struct dentry *parent, const char *name,
Al Virofec0eba2011-07-24 23:30:19 -0400338 char *data, umode_t mode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700339{
340 struct dentry *dentry;
341 struct inode *inode;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700342
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200343 mutex_lock(&parent->d_inode->i_mutex);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700344 dentry = lookup_one_len(name, parent, strlen(name));
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200345 if (IS_ERR(dentry)) {
346 dentry = ERR_PTR(-ENOMEM);
347 goto fail;
348 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700349 inode = hypfs_make_inode(sb, mode);
350 if (!inode) {
351 dput(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200352 dentry = ERR_PTR(-ENOMEM);
353 goto fail;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700354 }
Al Virofec0eba2011-07-24 23:30:19 -0400355 if (S_ISREG(mode)) {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700356 inode->i_fop = &hypfs_file_ops;
357 if (data)
358 inode->i_size = strlen(data);
359 else
360 inode->i_size = 0;
Al Virofec0eba2011-07-24 23:30:19 -0400361 } else if (S_ISDIR(mode)) {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700362 inode->i_op = &simple_dir_inode_operations;
363 inode->i_fop = &simple_dir_operations;
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200364 inc_nlink(parent->d_inode);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700365 } else
366 BUG();
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700367 inode->i_private = data;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700368 d_instantiate(dentry, inode);
369 dget(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200370fail:
371 mutex_unlock(&parent->d_inode->i_mutex);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700372 return dentry;
373}
374
375struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
376 const char *name)
377{
378 struct dentry *dentry;
379
380 dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE);
381 if (IS_ERR(dentry))
382 return dentry;
383 hypfs_add_dentry(dentry);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700384 return dentry;
385}
386
387static struct dentry *hypfs_create_update_file(struct super_block *sb,
388 struct dentry *dir)
389{
390 struct dentry *dentry;
391
392 dentry = hypfs_create_file(sb, dir, "update", NULL,
393 S_IFREG | UPDATE_FILE_MODE);
394 /*
395 * We do not put the update file on the 'delete' list with
396 * hypfs_add_dentry(), since it should not be removed when the tree
397 * is updated.
398 */
399 return dentry;
400}
401
402struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir,
403 const char *name, __u64 value)
404{
405 char *buffer;
406 char tmp[TMP_SIZE];
407 struct dentry *dentry;
408
Michael Holzheuad2a5d82009-09-11 10:28:54 +0200409 snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700410 buffer = kstrdup(tmp, GFP_KERNEL);
411 if (!buffer)
412 return ERR_PTR(-ENOMEM);
413 dentry =
414 hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
415 if (IS_ERR(dentry)) {
416 kfree(buffer);
417 return ERR_PTR(-ENOMEM);
418 }
419 hypfs_add_dentry(dentry);
420 return dentry;
421}
422
423struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir,
424 const char *name, char *string)
425{
426 char *buffer;
427 struct dentry *dentry;
428
429 buffer = kmalloc(strlen(string) + 2, GFP_KERNEL);
430 if (!buffer)
431 return ERR_PTR(-ENOMEM);
432 sprintf(buffer, "%s\n", string);
433 dentry =
434 hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
435 if (IS_ERR(dentry)) {
436 kfree(buffer);
437 return ERR_PTR(-ENOMEM);
438 }
439 hypfs_add_dentry(dentry);
440 return dentry;
441}
442
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -0800443static const struct file_operations hypfs_file_ops = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700444 .open = hypfs_open,
445 .release = hypfs_release,
446 .read = do_sync_read,
447 .write = do_sync_write,
448 .aio_read = hypfs_aio_read,
449 .aio_write = hypfs_aio_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200450 .llseek = no_llseek,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700451};
452
453static struct file_system_type hypfs_type = {
454 .owner = THIS_MODULE,
455 .name = "s390_hypfs",
Al Virofc14f2f2010-07-25 01:48:30 +0400456 .mount = hypfs_mount,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700457 .kill_sb = hypfs_kill_super
458};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800459MODULE_ALIAS_FS("s390_hypfs");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700460
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700461static const struct super_operations hypfs_s_ops = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700462 .statfs = simple_statfs,
Al Virob69257f2010-06-04 21:02:59 -0400463 .evict_inode = hypfs_evict_inode,
Michael Holzheub01af5b2007-08-10 14:32:27 +0200464 .show_options = hypfs_show_options,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700465};
466
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600467static struct kobject *s390_kobj;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700468
469static int __init hypfs_init(void)
470{
471 int rc;
472
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100473 rc = hypfs_dbfs_init();
474 if (rc)
475 return rc;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200476 if (hypfs_diag_init()) {
477 rc = -ENODATA;
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100478 goto fail_dbfs_exit;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200479 }
480 if (hypfs_vm_init()) {
481 rc = -ENODATA;
482 goto fail_hypfs_diag_exit;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700483 }
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600484 s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
485 if (!s390_kobj) {
Joe Perchesa419aef2009-08-18 11:18:35 -0700486 rc = -ENOMEM;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200487 goto fail_hypfs_vm_exit;
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600488 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700489 rc = register_filesystem(&hypfs_type);
490 if (rc)
491 goto fail_filesystem;
492 return 0;
493
494fail_filesystem:
Greg Kroah-Hartman38a382a2007-12-20 08:13:05 -0800495 kobject_put(s390_kobj);
Michael Holzheu57b28f62010-05-17 10:00:20 +0200496fail_hypfs_vm_exit:
497 hypfs_vm_exit();
498fail_hypfs_diag_exit:
499 hypfs_diag_exit();
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100500fail_dbfs_exit:
501 hypfs_dbfs_exit();
Michael Holzheuf55495b2008-12-25 13:39:39 +0100502 pr_err("Initialization of hypfs failed with rc=%i\n", rc);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700503 return rc;
504}
505
506static void __exit hypfs_exit(void)
507{
Michael Holzheu57b28f62010-05-17 10:00:20 +0200508 hypfs_diag_exit();
509 hypfs_vm_exit();
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100510 hypfs_dbfs_exit();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700511 unregister_filesystem(&hypfs_type);
Greg Kroah-Hartman38a382a2007-12-20 08:13:05 -0800512 kobject_put(s390_kobj);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700513}
514
515module_init(hypfs_init)
516module_exit(hypfs_exit)
517
518MODULE_LICENSE("GPL");
519MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>");
520MODULE_DESCRIPTION("s390 Hypervisor Filesystem");