blob: 8a2a887478cc770141f7f8138ee0b8cce44dda54 [file] [log] [blame]
Michael Holzheu24bbb1f2006-06-23 02:05:06 -07001/*
Michael Holzheuf19bfb22006-09-20 15:58:44 +02002 * arch/s390/hypfs/inode.c
Michael Holzheu24bbb1f2006-06-23 02:05:06 -07003 * Hypervisor filesystem for Linux on s390.
4 *
Michael Holzheuf55495b2008-12-25 13:39:39 +01005 * Copyright IBM Corp. 2006, 2008
Michael Holzheu24bbb1f2006-06-23 02:05:06 -07006 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
7 */
8
Michael Holzheuf55495b2008-12-25 13:39:39 +01009#define KMSG_COMPONENT "hypfs"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070012#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/fs.h>
15#include <linux/namei.h>
16#include <linux/vfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070018#include <linux/pagemap.h>
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070019#include <linux/time.h>
20#include <linux/parser.h>
21#include <linux/sysfs.h>
22#include <linux/module.h>
Michael Holzheub01af5b2007-08-10 14:32:27 +020023#include <linux/seq_file.h>
24#include <linux/mount.h>
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070025#include <asm/ebcdic.h>
26#include "hypfs.h"
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070027
28#define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */
29#define TMP_SIZE 64 /* size of temporary buffers */
30
31static struct dentry *hypfs_create_update_file(struct super_block *sb,
32 struct dentry *dir);
33
34struct hypfs_sb_info {
35 uid_t uid; /* uid used for files and dirs */
36 gid_t gid; /* gid used for files and dirs */
37 struct dentry *update_file; /* file to trigger update */
38 time_t last_update; /* last update time in secs since 1970 */
39 struct mutex lock; /* lock to protect update process */
40};
41
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -080042static const struct file_operations hypfs_file_ops;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070043static struct file_system_type hypfs_type;
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070044static const struct super_operations hypfs_s_ops;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070045
46/* start of list of all dentries, which have to be deleted on update */
47static struct dentry *hypfs_last_dentry;
48
49static void hypfs_update_update(struct super_block *sb)
50{
51 struct hypfs_sb_info *sb_info = sb->s_fs_info;
52 struct inode *inode = sb_info->update_file->d_inode;
53
54 sb_info->last_update = get_seconds();
55 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
56}
57
58/* directory tree removal functions */
59
60static void hypfs_add_dentry(struct dentry *dentry)
61{
62 dentry->d_fsdata = hypfs_last_dentry;
63 hypfs_last_dentry = dentry;
64}
65
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020066static inline int hypfs_positive(struct dentry *dentry)
67{
68 return dentry->d_inode && !d_unhashed(dentry);
69}
70
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070071static void hypfs_remove(struct dentry *dentry)
72{
73 struct dentry *parent;
74
75 parent = dentry->d_parent;
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020076 if (!parent || !parent->d_inode)
77 return;
78 mutex_lock(&parent->d_inode->i_mutex);
79 if (hypfs_positive(dentry)) {
80 if (S_ISDIR(dentry->d_inode->i_mode))
81 simple_rmdir(parent->d_inode, dentry);
82 else
83 simple_unlink(parent->d_inode, dentry);
84 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070085 d_delete(dentry);
86 dput(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020087 mutex_unlock(&parent->d_inode->i_mutex);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070088}
89
90static void hypfs_delete_tree(struct dentry *root)
91{
92 while (hypfs_last_dentry) {
93 struct dentry *next_dentry;
94 next_dentry = hypfs_last_dentry->d_fsdata;
95 hypfs_remove(hypfs_last_dentry);
96 hypfs_last_dentry = next_dentry;
97 }
98}
99
Al Virofec0eba2011-07-24 23:30:19 -0400100static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700101{
102 struct inode *ret = new_inode(sb);
103
104 if (ret) {
105 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
106 ret->i_mode = mode;
107 ret->i_uid = hypfs_info->uid;
108 ret->i_gid = hypfs_info->gid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700109 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
Al Virofec0eba2011-07-24 23:30:19 -0400110 if (S_ISDIR(mode))
Miklos Szeredibfe86842011-10-28 14:13:29 +0200111 set_nlink(ret, 2);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700112 }
113 return ret;
114}
115
Al Virob69257f2010-06-04 21:02:59 -0400116static void hypfs_evict_inode(struct inode *inode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700117{
Al Virob69257f2010-06-04 21:02:59 -0400118 end_writeback(inode);
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700119 kfree(inode->i_private);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700120}
121
122static int hypfs_open(struct inode *inode, struct file *filp)
123{
Josef Sipekd20343e2006-12-08 02:37:35 -0800124 char *data = filp->f_path.dentry->d_inode->i_private;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700125 struct hypfs_sb_info *fs_info;
126
127 if (filp->f_mode & FMODE_WRITE) {
128 if (!(inode->i_mode & S_IWUGO))
129 return -EACCES;
130 }
131 if (filp->f_mode & FMODE_READ) {
132 if (!(inode->i_mode & S_IRUGO))
133 return -EACCES;
134 }
135
136 fs_info = inode->i_sb->s_fs_info;
137 if(data) {
138 mutex_lock(&fs_info->lock);
139 filp->private_data = kstrdup(data, GFP_KERNEL);
140 if (!filp->private_data) {
141 mutex_unlock(&fs_info->lock);
142 return -ENOMEM;
143 }
144 mutex_unlock(&fs_info->lock);
145 }
Martin Schwidefsky58ea91c2010-05-17 10:00:07 +0200146 return nonseekable_open(inode, filp);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700147}
148
Badari Pulavarty027445c2006-09-30 23:28:46 -0700149static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov,
150 unsigned long nr_segs, loff_t offset)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700151{
152 char *data;
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200153 ssize_t ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700154 struct file *filp = iocb->ki_filp;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700155 /* XXX: temporary */
156 char __user *buf = iov[0].iov_base;
157 size_t count = iov[0].iov_len;
158
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200159 if (nr_segs != 1)
160 return -EINVAL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700161
162 data = filp->private_data;
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200163 ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data));
164 if (ret <= 0)
165 return ret;
166
167 iocb->ki_pos += ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700168 file_accessed(filp);
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200169
170 return ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700171}
Badari Pulavarty027445c2006-09-30 23:28:46 -0700172static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov,
173 unsigned long nr_segs, loff_t offset)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700174{
175 int rc;
176 struct super_block *sb;
177 struct hypfs_sb_info *fs_info;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700178 size_t count = iov_length(iov, nr_segs);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700179
Josef Sipekd20343e2006-12-08 02:37:35 -0800180 sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700181 fs_info = sb->s_fs_info;
182 /*
183 * Currently we only allow one update per second for two reasons:
184 * 1. diag 204 is VERY expensive
185 * 2. If several processes do updates in parallel and then read the
186 * hypfs data, the likelihood of collisions is reduced, if we restrict
187 * the minimum update interval. A collision occurs, if during the
188 * data gathering of one process another process triggers an update
189 * If the first process wants to ensure consistent data, it has
190 * to restart data collection in this case.
191 */
192 mutex_lock(&fs_info->lock);
193 if (fs_info->last_update == get_seconds()) {
194 rc = -EBUSY;
195 goto out;
196 }
197 hypfs_delete_tree(sb->s_root);
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100198 if (MACHINE_IS_VM)
199 rc = hypfs_vm_create_files(sb, sb->s_root);
200 else
201 rc = hypfs_diag_create_files(sb, sb->s_root);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700202 if (rc) {
Michael Holzheuf55495b2008-12-25 13:39:39 +0100203 pr_err("Updating the hypfs tree failed\n");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700204 hypfs_delete_tree(sb->s_root);
205 goto out;
206 }
207 hypfs_update_update(sb);
208 rc = count;
209out:
210 mutex_unlock(&fs_info->lock);
211 return rc;
212}
213
214static int hypfs_release(struct inode *inode, struct file *filp)
215{
216 kfree(filp->private_data);
217 return 0;
218}
219
220enum { opt_uid, opt_gid, opt_err };
221
Steven Whitehousea447c092008-10-13 10:46:57 +0100222static const match_table_t hypfs_tokens = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700223 {opt_uid, "uid=%u"},
224 {opt_gid, "gid=%u"},
225 {opt_err, NULL}
226};
227
228static int hypfs_parse_options(char *options, struct super_block *sb)
229{
230 char *str;
231 substring_t args[MAX_OPT_ARGS];
232
233 if (!options)
234 return 0;
235 while ((str = strsep(&options, ",")) != NULL) {
236 int token, option;
237 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
238
239 if (!*str)
240 continue;
241 token = match_token(str, hypfs_tokens, args);
242 switch (token) {
243 case opt_uid:
244 if (match_int(&args[0], &option))
245 return -EINVAL;
246 hypfs_info->uid = option;
247 break;
248 case opt_gid:
249 if (match_int(&args[0], &option))
250 return -EINVAL;
251 hypfs_info->gid = option;
252 break;
253 case opt_err:
254 default:
Michael Holzheuf55495b2008-12-25 13:39:39 +0100255 pr_err("%s is not a valid mount option\n", str);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700256 return -EINVAL;
257 }
258 }
259 return 0;
260}
261
Al Viro34c80b12011-12-08 21:32:45 -0500262static int hypfs_show_options(struct seq_file *s, struct dentry *root)
Michael Holzheub01af5b2007-08-10 14:32:27 +0200263{
Al Viro34c80b12011-12-08 21:32:45 -0500264 struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info;
Michael Holzheub01af5b2007-08-10 14:32:27 +0200265
266 seq_printf(s, ",uid=%u", hypfs_info->uid);
267 seq_printf(s, ",gid=%u", hypfs_info->gid);
268 return 0;
269}
270
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700271static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
272{
273 struct inode *root_inode;
274 struct dentry *root_dentry;
275 int rc = 0;
276 struct hypfs_sb_info *sbi;
277
278 sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
279 if (!sbi)
280 return -ENOMEM;
281 mutex_init(&sbi->lock);
David Howellse5423702008-11-14 10:38:39 +1100282 sbi->uid = current_uid();
283 sbi->gid = current_gid();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700284 sb->s_fs_info = sbi;
285 sb->s_blocksize = PAGE_CACHE_SIZE;
286 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
287 sb->s_magic = HYPFS_MAGIC;
288 sb->s_op = &hypfs_s_ops;
Al Virof1771ff2010-01-25 18:36:07 -0500289 if (hypfs_parse_options(data, sb))
290 return -EINVAL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700291 root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
Al Virof1771ff2010-01-25 18:36:07 -0500292 if (!root_inode)
293 return -ENOMEM;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700294 root_inode->i_op = &simple_dir_inode_operations;
295 root_inode->i_fop = &simple_dir_operations;
Al Virof1771ff2010-01-25 18:36:07 -0500296 sb->s_root = root_dentry = d_alloc_root(root_inode);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700297 if (!root_dentry) {
298 iput(root_inode);
Al Virof1771ff2010-01-25 18:36:07 -0500299 return -ENOMEM;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700300 }
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100301 if (MACHINE_IS_VM)
302 rc = hypfs_vm_create_files(sb, root_dentry);
303 else
304 rc = hypfs_diag_create_files(sb, root_dentry);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700305 if (rc)
Al Virof1771ff2010-01-25 18:36:07 -0500306 return rc;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700307 sbi->update_file = hypfs_create_update_file(sb, root_dentry);
Al Virof1771ff2010-01-25 18:36:07 -0500308 if (IS_ERR(sbi->update_file))
309 return PTR_ERR(sbi->update_file);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700310 hypfs_update_update(sb);
Michael Holzheuf55495b2008-12-25 13:39:39 +0100311 pr_info("Hypervisor filesystem mounted\n");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700312 return 0;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700313}
314
Al Virofc14f2f2010-07-25 01:48:30 +0400315static struct dentry *hypfs_mount(struct file_system_type *fst, int flags,
316 const char *devname, void *data)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700317{
Al Virofc14f2f2010-07-25 01:48:30 +0400318 return mount_single(fst, flags, data, hypfs_fill_super);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700319}
320
321static void hypfs_kill_super(struct super_block *sb)
322{
323 struct hypfs_sb_info *sb_info = sb->s_fs_info;
324
Al Virof1771ff2010-01-25 18:36:07 -0500325 if (sb->s_root)
Michael Holzheu388c5712006-09-20 16:00:04 +0200326 hypfs_delete_tree(sb->s_root);
Al Virof1771ff2010-01-25 18:36:07 -0500327 if (sb_info->update_file)
Michael Holzheu388c5712006-09-20 16:00:04 +0200328 hypfs_remove(sb_info->update_file);
Al Virof1771ff2010-01-25 18:36:07 -0500329 kfree(sb->s_fs_info);
330 sb->s_fs_info = NULL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700331 kill_litter_super(sb);
332}
333
334static struct dentry *hypfs_create_file(struct super_block *sb,
335 struct dentry *parent, const char *name,
Al Virofec0eba2011-07-24 23:30:19 -0400336 char *data, umode_t mode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700337{
338 struct dentry *dentry;
339 struct inode *inode;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700340
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200341 mutex_lock(&parent->d_inode->i_mutex);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700342 dentry = lookup_one_len(name, parent, strlen(name));
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200343 if (IS_ERR(dentry)) {
344 dentry = ERR_PTR(-ENOMEM);
345 goto fail;
346 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700347 inode = hypfs_make_inode(sb, mode);
348 if (!inode) {
349 dput(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200350 dentry = ERR_PTR(-ENOMEM);
351 goto fail;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700352 }
Al Virofec0eba2011-07-24 23:30:19 -0400353 if (S_ISREG(mode)) {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700354 inode->i_fop = &hypfs_file_ops;
355 if (data)
356 inode->i_size = strlen(data);
357 else
358 inode->i_size = 0;
Al Virofec0eba2011-07-24 23:30:19 -0400359 } else if (S_ISDIR(mode)) {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700360 inode->i_op = &simple_dir_inode_operations;
361 inode->i_fop = &simple_dir_operations;
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200362 inc_nlink(parent->d_inode);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700363 } else
364 BUG();
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700365 inode->i_private = data;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700366 d_instantiate(dentry, inode);
367 dget(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200368fail:
369 mutex_unlock(&parent->d_inode->i_mutex);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700370 return dentry;
371}
372
373struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
374 const char *name)
375{
376 struct dentry *dentry;
377
378 dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE);
379 if (IS_ERR(dentry))
380 return dentry;
381 hypfs_add_dentry(dentry);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700382 return dentry;
383}
384
385static struct dentry *hypfs_create_update_file(struct super_block *sb,
386 struct dentry *dir)
387{
388 struct dentry *dentry;
389
390 dentry = hypfs_create_file(sb, dir, "update", NULL,
391 S_IFREG | UPDATE_FILE_MODE);
392 /*
393 * We do not put the update file on the 'delete' list with
394 * hypfs_add_dentry(), since it should not be removed when the tree
395 * is updated.
396 */
397 return dentry;
398}
399
400struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir,
401 const char *name, __u64 value)
402{
403 char *buffer;
404 char tmp[TMP_SIZE];
405 struct dentry *dentry;
406
Michael Holzheuad2a5d82009-09-11 10:28:54 +0200407 snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700408 buffer = kstrdup(tmp, GFP_KERNEL);
409 if (!buffer)
410 return ERR_PTR(-ENOMEM);
411 dentry =
412 hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
413 if (IS_ERR(dentry)) {
414 kfree(buffer);
415 return ERR_PTR(-ENOMEM);
416 }
417 hypfs_add_dentry(dentry);
418 return dentry;
419}
420
421struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir,
422 const char *name, char *string)
423{
424 char *buffer;
425 struct dentry *dentry;
426
427 buffer = kmalloc(strlen(string) + 2, GFP_KERNEL);
428 if (!buffer)
429 return ERR_PTR(-ENOMEM);
430 sprintf(buffer, "%s\n", string);
431 dentry =
432 hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
433 if (IS_ERR(dentry)) {
434 kfree(buffer);
435 return ERR_PTR(-ENOMEM);
436 }
437 hypfs_add_dentry(dentry);
438 return dentry;
439}
440
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -0800441static const struct file_operations hypfs_file_ops = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700442 .open = hypfs_open,
443 .release = hypfs_release,
444 .read = do_sync_read,
445 .write = do_sync_write,
446 .aio_read = hypfs_aio_read,
447 .aio_write = hypfs_aio_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200448 .llseek = no_llseek,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700449};
450
451static struct file_system_type hypfs_type = {
452 .owner = THIS_MODULE,
453 .name = "s390_hypfs",
Al Virofc14f2f2010-07-25 01:48:30 +0400454 .mount = hypfs_mount,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700455 .kill_sb = hypfs_kill_super
456};
457
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700458static const struct super_operations hypfs_s_ops = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700459 .statfs = simple_statfs,
Al Virob69257f2010-06-04 21:02:59 -0400460 .evict_inode = hypfs_evict_inode,
Michael Holzheub01af5b2007-08-10 14:32:27 +0200461 .show_options = hypfs_show_options,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700462};
463
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600464static struct kobject *s390_kobj;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700465
466static int __init hypfs_init(void)
467{
468 int rc;
469
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100470 rc = hypfs_dbfs_init();
471 if (rc)
472 return rc;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200473 if (hypfs_diag_init()) {
474 rc = -ENODATA;
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100475 goto fail_dbfs_exit;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200476 }
477 if (hypfs_vm_init()) {
478 rc = -ENODATA;
479 goto fail_hypfs_diag_exit;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700480 }
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600481 s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
482 if (!s390_kobj) {
Joe Perchesa419aef2009-08-18 11:18:35 -0700483 rc = -ENOMEM;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200484 goto fail_hypfs_vm_exit;
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600485 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700486 rc = register_filesystem(&hypfs_type);
487 if (rc)
488 goto fail_filesystem;
489 return 0;
490
491fail_filesystem:
Greg Kroah-Hartman38a382a2007-12-20 08:13:05 -0800492 kobject_put(s390_kobj);
Michael Holzheu57b28f62010-05-17 10:00:20 +0200493fail_hypfs_vm_exit:
494 hypfs_vm_exit();
495fail_hypfs_diag_exit:
496 hypfs_diag_exit();
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100497fail_dbfs_exit:
498 hypfs_dbfs_exit();
Michael Holzheuf55495b2008-12-25 13:39:39 +0100499 pr_err("Initialization of hypfs failed with rc=%i\n", rc);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700500 return rc;
501}
502
503static void __exit hypfs_exit(void)
504{
Michael Holzheu57b28f62010-05-17 10:00:20 +0200505 hypfs_diag_exit();
506 hypfs_vm_exit();
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100507 hypfs_dbfs_exit();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700508 unregister_filesystem(&hypfs_type);
Greg Kroah-Hartman38a382a2007-12-20 08:13:05 -0800509 kobject_put(s390_kobj);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700510}
511
512module_init(hypfs_init)
513module_exit(hypfs_exit)
514
515MODULE_LICENSE("GPL");
516MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>");
517MODULE_DESCRIPTION("s390 Hypervisor Filesystem");