blob: 0f3da2cb2bd63c0d26649776fd53d844f3153d18 [file] [log] [blame]
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>
Christoph Hellwige2e40f22015-02-22 08:58:50 -080024#include <linux/uio.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
Al Viroa118cfd2013-07-19 18:05:21 +040031static struct dentry *hypfs_create_update_file(struct dentry *dir);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070032
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;
David Howells75c3cfa2015-03-17 22:26:12 +000051 struct inode *inode = d_inode(sb_info->update_file);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070052
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
65static void hypfs_remove(struct dentry *dentry)
66{
67 struct dentry *parent;
68
69 parent = dentry->d_parent;
Al Viro59551022016-01-22 15:40:57 -050070 inode_lock(d_inode(parent));
Al Virodc3f4192015-05-18 10:10:34 -040071 if (simple_positive(dentry)) {
David Howellse36cb0b2015-01-29 12:02:35 +000072 if (d_is_dir(dentry))
David Howells75c3cfa2015-03-17 22:26:12 +000073 simple_rmdir(d_inode(parent), dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020074 else
David Howells75c3cfa2015-03-17 22:26:12 +000075 simple_unlink(d_inode(parent), dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +020076 }
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070077 d_delete(dentry);
78 dput(dentry);
Al Viro59551022016-01-22 15:40:57 -050079 inode_unlock(d_inode(parent));
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070080}
81
82static void hypfs_delete_tree(struct dentry *root)
83{
84 while (hypfs_last_dentry) {
85 struct dentry *next_dentry;
86 next_dentry = hypfs_last_dentry->d_fsdata;
87 hypfs_remove(hypfs_last_dentry);
88 hypfs_last_dentry = next_dentry;
89 }
90}
91
Al Virofec0eba2011-07-24 23:30:19 -040092static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070093{
94 struct inode *ret = new_inode(sb);
95
96 if (ret) {
97 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
Michael Holzheuc960bec2012-06-29 14:48:09 +020098 ret->i_ino = get_next_ino();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -070099 ret->i_mode = mode;
100 ret->i_uid = hypfs_info->uid;
101 ret->i_gid = hypfs_info->gid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700102 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
Al Virofec0eba2011-07-24 23:30:19 -0400103 if (S_ISDIR(mode))
Miklos Szeredibfe86842011-10-28 14:13:29 +0200104 set_nlink(ret, 2);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700105 }
106 return ret;
107}
108
Al Virob69257f2010-06-04 21:02:59 -0400109static void hypfs_evict_inode(struct inode *inode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700110{
Jan Karadbd57682012-05-03 14:48:02 +0200111 clear_inode(inode);
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700112 kfree(inode->i_private);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700113}
114
115static int hypfs_open(struct inode *inode, struct file *filp)
116{
Al Viro496ad9a2013-01-23 17:07:38 -0500117 char *data = file_inode(filp)->i_private;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700118 struct hypfs_sb_info *fs_info;
119
120 if (filp->f_mode & FMODE_WRITE) {
121 if (!(inode->i_mode & S_IWUGO))
122 return -EACCES;
123 }
124 if (filp->f_mode & FMODE_READ) {
125 if (!(inode->i_mode & S_IRUGO))
126 return -EACCES;
127 }
128
129 fs_info = inode->i_sb->s_fs_info;
130 if(data) {
131 mutex_lock(&fs_info->lock);
132 filp->private_data = kstrdup(data, GFP_KERNEL);
133 if (!filp->private_data) {
134 mutex_unlock(&fs_info->lock);
135 return -ENOMEM;
136 }
137 mutex_unlock(&fs_info->lock);
138 }
Martin Schwidefsky58ea91c2010-05-17 10:00:07 +0200139 return nonseekable_open(inode, filp);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700140}
141
Al Viroa457ac22015-02-04 16:17:45 -0500142static ssize_t hypfs_read_iter(struct kiocb *iocb, struct iov_iter *to)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700143{
Al Viroa457ac22015-02-04 16:17:45 -0500144 struct file *file = iocb->ki_filp;
145 char *data = file->private_data;
146 size_t available = strlen(data);
147 loff_t pos = iocb->ki_pos;
148 size_t count;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700149
Al Viroa457ac22015-02-04 16:17:45 -0500150 if (pos < 0)
Akinobu Mitaa29591c2008-07-14 09:59:16 +0200151 return -EINVAL;
Al Viroa457ac22015-02-04 16:17:45 -0500152 if (pos >= available || !iov_iter_count(to))
153 return 0;
154 count = copy_to_iter(data + pos, available - pos, to);
155 if (!count)
156 return -EFAULT;
157 iocb->ki_pos = pos + count;
158 file_accessed(file);
159 return count;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700160}
Al Viroa457ac22015-02-04 16:17:45 -0500161
162static ssize_t hypfs_write_iter(struct kiocb *iocb, struct iov_iter *from)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700163{
164 int rc;
Al Viro6131ffa2013-02-27 16:59:05 -0500165 struct super_block *sb = file_inode(iocb->ki_filp)->i_sb;
166 struct hypfs_sb_info *fs_info = sb->s_fs_info;
Al Viroa457ac22015-02-04 16:17:45 -0500167 size_t count = iov_iter_count(from);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700168
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700169 /*
170 * Currently we only allow one update per second for two reasons:
171 * 1. diag 204 is VERY expensive
172 * 2. If several processes do updates in parallel and then read the
173 * hypfs data, the likelihood of collisions is reduced, if we restrict
174 * the minimum update interval. A collision occurs, if during the
175 * data gathering of one process another process triggers an update
176 * If the first process wants to ensure consistent data, it has
177 * to restart data collection in this case.
178 */
179 mutex_lock(&fs_info->lock);
180 if (fs_info->last_update == get_seconds()) {
181 rc = -EBUSY;
182 goto out;
183 }
184 hypfs_delete_tree(sb->s_root);
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100185 if (MACHINE_IS_VM)
Al Virof78e41e2013-07-19 17:03:49 +0400186 rc = hypfs_vm_create_files(sb->s_root);
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100187 else
Al Viroe334cf42013-07-19 17:10:21 +0400188 rc = hypfs_diag_create_files(sb->s_root);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700189 if (rc) {
Michael Holzheuf55495b2008-12-25 13:39:39 +0100190 pr_err("Updating the hypfs tree failed\n");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700191 hypfs_delete_tree(sb->s_root);
192 goto out;
193 }
194 hypfs_update_update(sb);
195 rc = count;
Al Viroa457ac22015-02-04 16:17:45 -0500196 iov_iter_advance(from, count);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700197out:
198 mutex_unlock(&fs_info->lock);
199 return rc;
200}
201
202static int hypfs_release(struct inode *inode, struct file *filp)
203{
204 kfree(filp->private_data);
205 return 0;
206}
207
208enum { opt_uid, opt_gid, opt_err };
209
Steven Whitehousea447c092008-10-13 10:46:57 +0100210static const match_table_t hypfs_tokens = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700211 {opt_uid, "uid=%u"},
212 {opt_gid, "gid=%u"},
213 {opt_err, NULL}
214};
215
216static int hypfs_parse_options(char *options, struct super_block *sb)
217{
218 char *str;
219 substring_t args[MAX_OPT_ARGS];
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700220 kuid_t uid;
221 kgid_t gid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700222
223 if (!options)
224 return 0;
225 while ((str = strsep(&options, ",")) != NULL) {
226 int token, option;
227 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
228
229 if (!*str)
230 continue;
231 token = match_token(str, hypfs_tokens, args);
232 switch (token) {
233 case opt_uid:
234 if (match_int(&args[0], &option))
235 return -EINVAL;
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700236 uid = make_kuid(current_user_ns(), option);
237 if (!uid_valid(uid))
238 return -EINVAL;
239 hypfs_info->uid = uid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700240 break;
241 case opt_gid:
242 if (match_int(&args[0], &option))
243 return -EINVAL;
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700244 gid = make_kgid(current_user_ns(), option);
245 if (!gid_valid(gid))
246 return -EINVAL;
247 hypfs_info->gid = gid;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700248 break;
249 case opt_err:
250 default:
Michael Holzheuf55495b2008-12-25 13:39:39 +0100251 pr_err("%s is not a valid mount option\n", str);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700252 return -EINVAL;
253 }
254 }
255 return 0;
256}
257
Al Viro34c80b12011-12-08 21:32:45 -0500258static int hypfs_show_options(struct seq_file *s, struct dentry *root)
Michael Holzheub01af5b2007-08-10 14:32:27 +0200259{
Al Viro34c80b12011-12-08 21:32:45 -0500260 struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info;
Michael Holzheub01af5b2007-08-10 14:32:27 +0200261
Eric W. Biederman6a62a212012-08-07 03:47:41 -0700262 seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid));
263 seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid));
Michael Holzheub01af5b2007-08-10 14:32:27 +0200264 return 0;
265}
266
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700267static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
268{
269 struct inode *root_inode;
270 struct dentry *root_dentry;
271 int rc = 0;
272 struct hypfs_sb_info *sbi;
273
274 sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
275 if (!sbi)
276 return -ENOMEM;
277 mutex_init(&sbi->lock);
David Howellse5423702008-11-14 10:38:39 +1100278 sbi->uid = current_uid();
279 sbi->gid = current_gid();
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700280 sb->s_fs_info = sbi;
281 sb->s_blocksize = PAGE_CACHE_SIZE;
282 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
283 sb->s_magic = HYPFS_MAGIC;
284 sb->s_op = &hypfs_s_ops;
Al Virof1771ff2010-01-25 18:36:07 -0500285 if (hypfs_parse_options(data, sb))
286 return -EINVAL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700287 root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
Al Virof1771ff2010-01-25 18:36:07 -0500288 if (!root_inode)
289 return -ENOMEM;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700290 root_inode->i_op = &simple_dir_inode_operations;
291 root_inode->i_fop = &simple_dir_operations;
Al Viro48fde702012-01-08 22:15:13 -0500292 sb->s_root = root_dentry = d_make_root(root_inode);
293 if (!root_dentry)
Al Virof1771ff2010-01-25 18:36:07 -0500294 return -ENOMEM;
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100295 if (MACHINE_IS_VM)
Al Virof78e41e2013-07-19 17:03:49 +0400296 rc = hypfs_vm_create_files(root_dentry);
Michael Holzheu31cb4bd2007-02-05 21:18:29 +0100297 else
Al Viroe334cf42013-07-19 17:10:21 +0400298 rc = hypfs_diag_create_files(root_dentry);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700299 if (rc)
Al Virof1771ff2010-01-25 18:36:07 -0500300 return rc;
Al Viroa118cfd2013-07-19 18:05:21 +0400301 sbi->update_file = hypfs_create_update_file(root_dentry);
Al Virof1771ff2010-01-25 18:36:07 -0500302 if (IS_ERR(sbi->update_file))
303 return PTR_ERR(sbi->update_file);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700304 hypfs_update_update(sb);
Michael Holzheuf55495b2008-12-25 13:39:39 +0100305 pr_info("Hypervisor filesystem mounted\n");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700306 return 0;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700307}
308
Al Virofc14f2f2010-07-25 01:48:30 +0400309static struct dentry *hypfs_mount(struct file_system_type *fst, int flags,
310 const char *devname, void *data)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700311{
Al Virofc14f2f2010-07-25 01:48:30 +0400312 return mount_single(fst, flags, data, hypfs_fill_super);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700313}
314
315static void hypfs_kill_super(struct super_block *sb)
316{
317 struct hypfs_sb_info *sb_info = sb->s_fs_info;
318
Al Virof1771ff2010-01-25 18:36:07 -0500319 if (sb->s_root)
Michael Holzheu388c5712006-09-20 16:00:04 +0200320 hypfs_delete_tree(sb->s_root);
Al Virof1771ff2010-01-25 18:36:07 -0500321 if (sb_info->update_file)
Michael Holzheu388c5712006-09-20 16:00:04 +0200322 hypfs_remove(sb_info->update_file);
Al Virof1771ff2010-01-25 18:36:07 -0500323 kfree(sb->s_fs_info);
324 sb->s_fs_info = NULL;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700325 kill_litter_super(sb);
326}
327
Al Viroa118cfd2013-07-19 18:05:21 +0400328static struct dentry *hypfs_create_file(struct dentry *parent, const char *name,
Al Virofec0eba2011-07-24 23:30:19 -0400329 char *data, umode_t mode)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700330{
331 struct dentry *dentry;
332 struct inode *inode;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700333
Al Viro59551022016-01-22 15:40:57 -0500334 inode_lock(d_inode(parent));
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700335 dentry = lookup_one_len(name, parent, strlen(name));
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200336 if (IS_ERR(dentry)) {
337 dentry = ERR_PTR(-ENOMEM);
338 goto fail;
339 }
Al Viroa118cfd2013-07-19 18:05:21 +0400340 inode = hypfs_make_inode(parent->d_sb, mode);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700341 if (!inode) {
342 dput(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200343 dentry = ERR_PTR(-ENOMEM);
344 goto fail;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700345 }
Al Virofec0eba2011-07-24 23:30:19 -0400346 if (S_ISREG(mode)) {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700347 inode->i_fop = &hypfs_file_ops;
348 if (data)
349 inode->i_size = strlen(data);
350 else
351 inode->i_size = 0;
Al Virofec0eba2011-07-24 23:30:19 -0400352 } else if (S_ISDIR(mode)) {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700353 inode->i_op = &simple_dir_inode_operations;
354 inode->i_fop = &simple_dir_operations;
David Howells75c3cfa2015-03-17 22:26:12 +0000355 inc_nlink(d_inode(parent));
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700356 } else
357 BUG();
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700358 inode->i_private = data;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700359 d_instantiate(dentry, inode);
360 dget(dentry);
Michael Holzheu9b5a03e2007-08-22 13:51:43 +0200361fail:
Al Viro59551022016-01-22 15:40:57 -0500362 inode_unlock(d_inode(parent));
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700363 return dentry;
364}
365
Al Viroa118cfd2013-07-19 18:05:21 +0400366struct dentry *hypfs_mkdir(struct dentry *parent, const char *name)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700367{
368 struct dentry *dentry;
369
Al Viroa118cfd2013-07-19 18:05:21 +0400370 dentry = hypfs_create_file(parent, name, NULL, S_IFDIR | DIR_MODE);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700371 if (IS_ERR(dentry))
372 return dentry;
373 hypfs_add_dentry(dentry);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700374 return dentry;
375}
376
Al Viroa118cfd2013-07-19 18:05:21 +0400377static struct dentry *hypfs_create_update_file(struct dentry *dir)
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700378{
379 struct dentry *dentry;
380
Al Viroa118cfd2013-07-19 18:05:21 +0400381 dentry = hypfs_create_file(dir, "update", NULL,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700382 S_IFREG | UPDATE_FILE_MODE);
383 /*
384 * We do not put the update file on the 'delete' list with
385 * hypfs_add_dentry(), since it should not be removed when the tree
386 * is updated.
387 */
388 return dentry;
389}
390
Al Viroa118cfd2013-07-19 18:05:21 +0400391struct dentry *hypfs_create_u64(struct dentry *dir,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700392 const char *name, __u64 value)
393{
394 char *buffer;
395 char tmp[TMP_SIZE];
396 struct dentry *dentry;
397
Michael Holzheuad2a5d82009-09-11 10:28:54 +0200398 snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700399 buffer = kstrdup(tmp, GFP_KERNEL);
400 if (!buffer)
401 return ERR_PTR(-ENOMEM);
402 dentry =
Al Viroa118cfd2013-07-19 18:05:21 +0400403 hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700404 if (IS_ERR(dentry)) {
405 kfree(buffer);
406 return ERR_PTR(-ENOMEM);
407 }
408 hypfs_add_dentry(dentry);
409 return dentry;
410}
411
Al Viroa118cfd2013-07-19 18:05:21 +0400412struct dentry *hypfs_create_str(struct dentry *dir,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700413 const char *name, char *string)
414{
415 char *buffer;
416 struct dentry *dentry;
417
418 buffer = kmalloc(strlen(string) + 2, GFP_KERNEL);
419 if (!buffer)
420 return ERR_PTR(-ENOMEM);
421 sprintf(buffer, "%s\n", string);
422 dentry =
Al Viroa118cfd2013-07-19 18:05:21 +0400423 hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700424 if (IS_ERR(dentry)) {
425 kfree(buffer);
426 return ERR_PTR(-ENOMEM);
427 }
428 hypfs_add_dentry(dentry);
429 return dentry;
430}
431
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -0800432static const struct file_operations hypfs_file_ops = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700433 .open = hypfs_open,
434 .release = hypfs_release,
Al Viroa457ac22015-02-04 16:17:45 -0500435 .read_iter = hypfs_read_iter,
436 .write_iter = hypfs_write_iter,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200437 .llseek = no_llseek,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700438};
439
440static struct file_system_type hypfs_type = {
441 .owner = THIS_MODULE,
442 .name = "s390_hypfs",
Al Virofc14f2f2010-07-25 01:48:30 +0400443 .mount = hypfs_mount,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700444 .kill_sb = hypfs_kill_super
445};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800446MODULE_ALIAS_FS("s390_hypfs");
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700447
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700448static const struct super_operations hypfs_s_ops = {
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700449 .statfs = simple_statfs,
Al Virob69257f2010-06-04 21:02:59 -0400450 .evict_inode = hypfs_evict_inode,
Michael Holzheub01af5b2007-08-10 14:32:27 +0200451 .show_options = hypfs_show_options,
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700452};
453
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700454static int __init hypfs_init(void)
455{
456 int rc;
457
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100458 rc = hypfs_dbfs_init();
459 if (rc)
460 return rc;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200461 if (hypfs_diag_init()) {
462 rc = -ENODATA;
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100463 goto fail_dbfs_exit;
Michael Holzheu57b28f62010-05-17 10:00:20 +0200464 }
465 if (hypfs_vm_init()) {
466 rc = -ENODATA;
467 goto fail_hypfs_diag_exit;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700468 }
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100469 if (hypfs_sprp_init()) {
470 rc = -ENODATA;
471 goto fail_hypfs_vm_exit;
472 }
Michael Holzheu34c0dad2015-02-09 14:49:10 +0100473 if (hypfs_diag0c_init()) {
474 rc = -ENODATA;
475 goto fail_hypfs_sprp_exit;
476 }
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -0500477 rc = sysfs_create_mount_point(hypervisor_kobj, "s390");
478 if (rc)
Michael Holzheu34c0dad2015-02-09 14:49:10 +0100479 goto fail_hypfs_diag0c_exit;
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700480 rc = register_filesystem(&hypfs_type);
481 if (rc)
482 goto fail_filesystem;
483 return 0;
484
485fail_filesystem:
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -0500486 sysfs_remove_mount_point(hypervisor_kobj, "s390");
Michael Holzheu34c0dad2015-02-09 14:49:10 +0100487fail_hypfs_diag0c_exit:
488 hypfs_diag0c_exit();
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100489fail_hypfs_sprp_exit:
490 hypfs_sprp_exit();
Michael Holzheu57b28f62010-05-17 10:00:20 +0200491fail_hypfs_vm_exit:
492 hypfs_vm_exit();
493fail_hypfs_diag_exit:
494 hypfs_diag_exit();
Michael Holzheu2fcb3682011-01-05 12:47:43 +0100495fail_dbfs_exit:
496 hypfs_dbfs_exit();
Michael Holzheuf55495b2008-12-25 13:39:39 +0100497 pr_err("Initialization of hypfs failed with rc=%i\n", rc);
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700498 return rc;
499}
500
501static void __exit hypfs_exit(void)
502{
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700503 unregister_filesystem(&hypfs_type);
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -0500504 sysfs_remove_mount_point(hypervisor_kobj, "s390");
Michael Holzheu34c0dad2015-02-09 14:49:10 +0100505 hypfs_diag0c_exit();
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100506 hypfs_sprp_exit();
507 hypfs_vm_exit();
508 hypfs_diag_exit();
509 hypfs_dbfs_exit();
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");