blob: 6fe874fc5f8efe4456f942da01eddc6b2c9b1d50 [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
100static struct inode *hypfs_make_inode(struct super_block *sb, int mode)
101{
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;
110 if (mode & S_IFDIR)
111 ret->i_nlink = 2;
112 else
113 ret->i_nlink = 1;
114 }
115 return ret;
116}
117
Al Virob69257f2010-06-04 21:02:59 -0400118static void hypfs_evict_inode(struct inode *inode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700119{
Al Virob69257f2010-06-04 21:02:59 -0400120 end_writeback(inode);
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700121 kfree(inode->i_private);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700122}
123
124static int hypfs_open(struct inode *inode, struct file *filp)
125{
Josef Sipekd20343e2006-12-08 02:37:35 -0800126 char *data = filp->f_path.dentry->d_inode->i_private;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700127 struct hypfs_sb_info *fs_info;
128
129 if (filp->f_mode & FMODE_WRITE) {
130 if (!(inode->i_mode & S_IWUGO))
131 return -EACCES;
132 }
133 if (filp->f_mode & FMODE_READ) {
134 if (!(inode->i_mode & S_IRUGO))
135 return -EACCES;
136 }
137
138 fs_info = inode->i_sb->s_fs_info;
139 if(data) {
140 mutex_lock(&fs_info->lock);
141 filp->private_data = kstrdup(data, GFP_KERNEL);
142 if (!filp->private_data) {
143 mutex_unlock(&fs_info->lock);
144 return -ENOMEM;
145 }
146 mutex_unlock(&fs_info->lock);
147 }
Martin Schwidefsky58ea91c2010-05-17 10:00:07 +0200148 return nonseekable_open(inode, filp);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700149}
150
Badari Pulavarty027445c2006-09-30 23:28:46 -0700151static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov,
152 unsigned long nr_segs, loff_t offset)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700153{
154 char *data;
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200155 ssize_t ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700156 struct file *filp = iocb->ki_filp;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700157 /* XXX: temporary */
158 char __user *buf = iov[0].iov_base;
159 size_t count = iov[0].iov_len;
160
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200161 if (nr_segs != 1)
162 return -EINVAL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700163
164 data = filp->private_data;
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200165 ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data));
166 if (ret <= 0)
167 return ret;
168
169 iocb->ki_pos += ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700170 file_accessed(filp);
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200171
172 return ret;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700173}
Badari Pulavarty027445c2006-09-30 23:28:46 -0700174static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov,
175 unsigned long nr_segs, loff_t offset)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700176{
177 int rc;
178 struct super_block *sb;
179 struct hypfs_sb_info *fs_info;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700180 size_t count = iov_length(iov, nr_segs);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700181
Josef Sipekd20343e2006-12-08 02:37:35 -0800182 sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700183 fs_info = sb->s_fs_info;
184 /*
185 * Currently we only allow one update per second for two reasons:
186 * 1. diag 204 is VERY expensive
187 * 2. If several processes do updates in parallel and then read the
188 * hypfs data, the likelihood of collisions is reduced, if we restrict
189 * the minimum update interval. A collision occurs, if during the
190 * data gathering of one process another process triggers an update
191 * If the first process wants to ensure consistent data, it has
192 * to restart data collection in this case.
193 */
194 mutex_lock(&fs_info->lock);
195 if (fs_info->last_update == get_seconds()) {
196 rc = -EBUSY;
197 goto out;
198 }
199 hypfs_delete_tree(sb->s_root);
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100200 if (MACHINE_IS_VM)
201 rc = hypfs_vm_create_files(sb, sb->s_root);
202 else
203 rc = hypfs_diag_create_files(sb, sb->s_root);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700204 if (rc) {
Michael Holzheuf55495b2008-12-25 13:39:39 +0100205 pr_err("Updating the hypfs tree failed\n");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700206 hypfs_delete_tree(sb->s_root);
207 goto out;
208 }
209 hypfs_update_update(sb);
210 rc = count;
211out:
212 mutex_unlock(&fs_info->lock);
213 return rc;
214}
215
216static int hypfs_release(struct inode *inode, struct file *filp)
217{
218 kfree(filp->private_data);
219 return 0;
220}
221
222enum { opt_uid, opt_gid, opt_err };
223
Steven Whitehousea447c092008-10-13 10:46:57 +0100224static const match_table_t hypfs_tokens = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700225 {opt_uid, "uid=%u"},
226 {opt_gid, "gid=%u"},
227 {opt_err, NULL}
228};
229
230static int hypfs_parse_options(char *options, struct super_block *sb)
231{
232 char *str;
233 substring_t args[MAX_OPT_ARGS];
234
235 if (!options)
236 return 0;
237 while ((str = strsep(&options, ",")) != NULL) {
238 int token, option;
239 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
240
241 if (!*str)
242 continue;
243 token = match_token(str, hypfs_tokens, args);
244 switch (token) {
245 case opt_uid:
246 if (match_int(&args[0], &option))
247 return -EINVAL;
248 hypfs_info->uid = option;
249 break;
250 case opt_gid:
251 if (match_int(&args[0], &option))
252 return -EINVAL;
253 hypfs_info->gid = option;
254 break;
255 case opt_err:
256 default:
Michael Holzheuf55495b2008-12-25 13:39:39 +0100257 pr_err("%s is not a valid mount option\n", str);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700258 return -EINVAL;
259 }
260 }
261 return 0;
262}
263
Michael Holzheub01af5b2007-08-10 14:32:27 +0200264static int hypfs_show_options(struct seq_file *s, struct vfsmount *mnt)
265{
266 struct hypfs_sb_info *hypfs_info = mnt->mnt_sb->s_fs_info;
267
268 seq_printf(s, ",uid=%u", hypfs_info->uid);
269 seq_printf(s, ",gid=%u", hypfs_info->gid);
270 return 0;
271}
272
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700273static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
274{
275 struct inode *root_inode;
276 struct dentry *root_dentry;
277 int rc = 0;
278 struct hypfs_sb_info *sbi;
279
280 sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
281 if (!sbi)
282 return -ENOMEM;
283 mutex_init(&sbi->lock);
David Howellse5423702008-11-14 10:38:39 +1100284 sbi->uid = current_uid();
285 sbi->gid = current_gid();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700286 sb->s_fs_info = sbi;
287 sb->s_blocksize = PAGE_CACHE_SIZE;
288 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
289 sb->s_magic = HYPFS_MAGIC;
290 sb->s_op = &hypfs_s_ops;
Al Virof1771ff2010-01-25 18:36:07 -0500291 if (hypfs_parse_options(data, sb))
292 return -EINVAL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700293 root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
Al Virof1771ff2010-01-25 18:36:07 -0500294 if (!root_inode)
295 return -ENOMEM;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700296 root_inode->i_op = &simple_dir_inode_operations;
297 root_inode->i_fop = &simple_dir_operations;
Al Virof1771ff2010-01-25 18:36:07 -0500298 sb->s_root = root_dentry = d_alloc_root(root_inode);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700299 if (!root_dentry) {
300 iput(root_inode);
Al Virof1771ff2010-01-25 18:36:07 -0500301 return -ENOMEM;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700302 }
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,
338 char *data, mode_t mode)
339{
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 }
355 if (mode & S_IFREG) {
356 inode->i_fop = &hypfs_file_ops;
357 if (data)
358 inode->i_size = strlen(data);
359 else
360 inode->i_size = 0;
361 } else if (mode & S_IFDIR) {
362 inode->i_op = &simple_dir_inode_operations;
363 inode->i_fop = &simple_dir_operations;
364 parent->d_inode->i_nlink++;
365 } 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};
459
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700460static const struct super_operations hypfs_s_ops = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700461 .statfs = simple_statfs,
Al Virob69257f2010-06-04 21:02:59 -0400462 .evict_inode = hypfs_evict_inode,
Michael Holzheub01af5b2007-08-10 14:32:27 +0200463 .show_options = hypfs_show_options,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700464};
465
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600466static struct kobject *s390_kobj;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700467
468static int __init hypfs_init(void)
469{
470 int rc;
471
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100472 rc = hypfs_dbfs_init();
473 if (rc)
474 return rc;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200475 if (hypfs_diag_init()) {
476 rc = -ENODATA;
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100477 goto fail_dbfs_exit;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200478 }
479 if (hypfs_vm_init()) {
480 rc = -ENODATA;
481 goto fail_hypfs_diag_exit;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700482 }
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600483 s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
484 if (!s390_kobj) {
Joe Perchesa419aef2009-08-18 11:18:35 -0700485 rc = -ENOMEM;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200486 goto fail_hypfs_vm_exit;
Greg Kroah-Hartman9b477702007-11-01 09:29:06 -0600487 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700488 rc = register_filesystem(&hypfs_type);
489 if (rc)
490 goto fail_filesystem;
491 return 0;
492
493fail_filesystem:
Greg Kroah-Hartman38a382a2007-12-20 08:13:05 -0800494 kobject_put(s390_kobj);
Michael Holzheu57b28f62010-05-17 10:00:20 +0200495fail_hypfs_vm_exit:
496 hypfs_vm_exit();
497fail_hypfs_diag_exit:
498 hypfs_diag_exit();
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100499fail_dbfs_exit:
500 hypfs_dbfs_exit();
Michael Holzheuf55495b2008-12-25 13:39:39 +0100501 pr_err("Initialization of hypfs failed with rc=%i\n", rc);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700502 return rc;
503}
504
505static void __exit hypfs_exit(void)
506{
Michael Holzheu57b28f62010-05-17 10:00:20 +0200507 hypfs_diag_exit();
508 hypfs_vm_exit();
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100509 hypfs_dbfs_exit();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700510 unregister_filesystem(&hypfs_type);
Greg Kroah-Hartman38a382a2007-12-20 08:13:05 -0800511 kobject_put(s390_kobj);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700512}
513
514module_init(hypfs_init)
515module_exit(hypfs_exit)
516
517MODULE_LICENSE("GPL");
518MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>");
519MODULE_DESCRIPTION("s390 Hypervisor Filesystem");