Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 1 | /* |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 2 | * Hypervisor filesystem for Linux on s390. |
| 3 | * |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 4 | * Copyright IBM Corp. 2006, 2008 |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 5 | * Author(s): Michael Holzheu <holzheu@de.ibm.com> |
| 6 | */ |
| 7 | |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 8 | #define KMSG_COMPONENT "hypfs" |
| 9 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 10 | |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 11 | #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 Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 17 | #include <linux/pagemap.h> |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 18 | #include <linux/time.h> |
| 19 | #include <linux/parser.h> |
| 20 | #include <linux/sysfs.h> |
| 21 | #include <linux/module.h> |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 22 | #include <linux/seq_file.h> |
| 23 | #include <linux/mount.h> |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 24 | #include <asm/ebcdic.h> |
| 25 | #include "hypfs.h" |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 26 | |
| 27 | #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ |
| 28 | #define TMP_SIZE 64 /* size of temporary buffers */ |
| 29 | |
| 30 | static struct dentry *hypfs_create_update_file(struct super_block *sb, |
| 31 | struct dentry *dir); |
| 32 | |
| 33 | struct hypfs_sb_info { |
Eric W. Biederman | 6a62a21 | 2012-08-07 03:47:41 -0700 | [diff] [blame^] | 34 | kuid_t uid; /* uid used for files and dirs */ |
| 35 | kgid_t gid; /* gid used for files and dirs */ |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 36 | 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 Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 41 | static const struct file_operations hypfs_file_ops; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 42 | static struct file_system_type hypfs_type; |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 43 | static const struct super_operations hypfs_s_ops; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 44 | |
| 45 | /* start of list of all dentries, which have to be deleted on update */ |
| 46 | static struct dentry *hypfs_last_dentry; |
| 47 | |
| 48 | static 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 | |
| 59 | static void hypfs_add_dentry(struct dentry *dentry) |
| 60 | { |
| 61 | dentry->d_fsdata = hypfs_last_dentry; |
| 62 | hypfs_last_dentry = dentry; |
| 63 | } |
| 64 | |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 65 | static inline int hypfs_positive(struct dentry *dentry) |
| 66 | { |
| 67 | return dentry->d_inode && !d_unhashed(dentry); |
| 68 | } |
| 69 | |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 70 | static void hypfs_remove(struct dentry *dentry) |
| 71 | { |
| 72 | struct dentry *parent; |
| 73 | |
| 74 | parent = dentry->d_parent; |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 75 | if (!parent || !parent->d_inode) |
| 76 | return; |
| 77 | mutex_lock(&parent->d_inode->i_mutex); |
| 78 | if (hypfs_positive(dentry)) { |
| 79 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 80 | simple_rmdir(parent->d_inode, dentry); |
| 81 | else |
| 82 | simple_unlink(parent->d_inode, dentry); |
| 83 | } |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 84 | d_delete(dentry); |
| 85 | dput(dentry); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 86 | mutex_unlock(&parent->d_inode->i_mutex); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | static void hypfs_delete_tree(struct dentry *root) |
| 90 | { |
| 91 | while (hypfs_last_dentry) { |
| 92 | struct dentry *next_dentry; |
| 93 | next_dentry = hypfs_last_dentry->d_fsdata; |
| 94 | hypfs_remove(hypfs_last_dentry); |
| 95 | hypfs_last_dentry = next_dentry; |
| 96 | } |
| 97 | } |
| 98 | |
Al Viro | fec0eba | 2011-07-24 23:30:19 -0400 | [diff] [blame] | 99 | static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 100 | { |
| 101 | struct inode *ret = new_inode(sb); |
| 102 | |
| 103 | if (ret) { |
| 104 | struct hypfs_sb_info *hypfs_info = sb->s_fs_info; |
Michael Holzheu | c960bec | 2012-06-29 14:48:09 +0200 | [diff] [blame] | 105 | ret->i_ino = get_next_ino(); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 106 | ret->i_mode = mode; |
| 107 | ret->i_uid = hypfs_info->uid; |
| 108 | ret->i_gid = hypfs_info->gid; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 109 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
Al Viro | fec0eba | 2011-07-24 23:30:19 -0400 | [diff] [blame] | 110 | if (S_ISDIR(mode)) |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 111 | set_nlink(ret, 2); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 112 | } |
| 113 | return ret; |
| 114 | } |
| 115 | |
Al Viro | b69257f | 2010-06-04 21:02:59 -0400 | [diff] [blame] | 116 | static void hypfs_evict_inode(struct inode *inode) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 117 | { |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 118 | clear_inode(inode); |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 119 | kfree(inode->i_private); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static int hypfs_open(struct inode *inode, struct file *filp) |
| 123 | { |
Josef Sipek | d20343e | 2006-12-08 02:37:35 -0800 | [diff] [blame] | 124 | char *data = filp->f_path.dentry->d_inode->i_private; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 125 | 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 Schwidefsky | 58ea91c | 2010-05-17 10:00:07 +0200 | [diff] [blame] | 146 | return nonseekable_open(inode, filp); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 147 | } |
| 148 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 149 | static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 150 | unsigned long nr_segs, loff_t offset) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 151 | { |
| 152 | char *data; |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 153 | ssize_t ret; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 154 | struct file *filp = iocb->ki_filp; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 155 | /* XXX: temporary */ |
| 156 | char __user *buf = iov[0].iov_base; |
| 157 | size_t count = iov[0].iov_len; |
| 158 | |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 159 | if (nr_segs != 1) |
| 160 | return -EINVAL; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 161 | |
| 162 | data = filp->private_data; |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 163 | 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 Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 168 | file_accessed(filp); |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 169 | |
| 170 | return ret; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 171 | } |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 172 | static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 173 | unsigned long nr_segs, loff_t offset) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 174 | { |
| 175 | int rc; |
| 176 | struct super_block *sb; |
| 177 | struct hypfs_sb_info *fs_info; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 178 | size_t count = iov_length(iov, nr_segs); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 179 | |
Josef Sipek | d20343e | 2006-12-08 02:37:35 -0800 | [diff] [blame] | 180 | sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 181 | 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 Holzheu | 31cb4bd | 2007-02-05 21:18:29 +0100 | [diff] [blame] | 198 | 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 Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 202 | if (rc) { |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 203 | pr_err("Updating the hypfs tree failed\n"); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 204 | hypfs_delete_tree(sb->s_root); |
| 205 | goto out; |
| 206 | } |
| 207 | hypfs_update_update(sb); |
| 208 | rc = count; |
| 209 | out: |
| 210 | mutex_unlock(&fs_info->lock); |
| 211 | return rc; |
| 212 | } |
| 213 | |
| 214 | static int hypfs_release(struct inode *inode, struct file *filp) |
| 215 | { |
| 216 | kfree(filp->private_data); |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | enum { opt_uid, opt_gid, opt_err }; |
| 221 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 222 | static const match_table_t hypfs_tokens = { |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 223 | {opt_uid, "uid=%u"}, |
| 224 | {opt_gid, "gid=%u"}, |
| 225 | {opt_err, NULL} |
| 226 | }; |
| 227 | |
| 228 | static int hypfs_parse_options(char *options, struct super_block *sb) |
| 229 | { |
| 230 | char *str; |
| 231 | substring_t args[MAX_OPT_ARGS]; |
Eric W. Biederman | 6a62a21 | 2012-08-07 03:47:41 -0700 | [diff] [blame^] | 232 | kuid_t uid; |
| 233 | kgid_t gid; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 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; |
Eric W. Biederman | 6a62a21 | 2012-08-07 03:47:41 -0700 | [diff] [blame^] | 248 | uid = make_kuid(current_user_ns(), option); |
| 249 | if (!uid_valid(uid)) |
| 250 | return -EINVAL; |
| 251 | hypfs_info->uid = uid; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 252 | break; |
| 253 | case opt_gid: |
| 254 | if (match_int(&args[0], &option)) |
| 255 | return -EINVAL; |
Eric W. Biederman | 6a62a21 | 2012-08-07 03:47:41 -0700 | [diff] [blame^] | 256 | gid = make_kgid(current_user_ns(), option); |
| 257 | if (!gid_valid(gid)) |
| 258 | return -EINVAL; |
| 259 | hypfs_info->gid = gid; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 260 | break; |
| 261 | case opt_err: |
| 262 | default: |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 263 | pr_err("%s is not a valid mount option\n", str); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 264 | return -EINVAL; |
| 265 | } |
| 266 | } |
| 267 | return 0; |
| 268 | } |
| 269 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 270 | static int hypfs_show_options(struct seq_file *s, struct dentry *root) |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 271 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 272 | struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info; |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 273 | |
Eric W. Biederman | 6a62a21 | 2012-08-07 03:47:41 -0700 | [diff] [blame^] | 274 | seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid)); |
| 275 | seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid)); |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 276 | return 0; |
| 277 | } |
| 278 | |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 279 | static int hypfs_fill_super(struct super_block *sb, void *data, int silent) |
| 280 | { |
| 281 | struct inode *root_inode; |
| 282 | struct dentry *root_dentry; |
| 283 | int rc = 0; |
| 284 | struct hypfs_sb_info *sbi; |
| 285 | |
| 286 | sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL); |
| 287 | if (!sbi) |
| 288 | return -ENOMEM; |
| 289 | mutex_init(&sbi->lock); |
David Howells | e542370 | 2008-11-14 10:38:39 +1100 | [diff] [blame] | 290 | sbi->uid = current_uid(); |
| 291 | sbi->gid = current_gid(); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 292 | sb->s_fs_info = sbi; |
| 293 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 294 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 295 | sb->s_magic = HYPFS_MAGIC; |
| 296 | sb->s_op = &hypfs_s_ops; |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 297 | if (hypfs_parse_options(data, sb)) |
| 298 | return -EINVAL; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 299 | root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 300 | if (!root_inode) |
| 301 | return -ENOMEM; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 302 | root_inode->i_op = &simple_dir_inode_operations; |
| 303 | root_inode->i_fop = &simple_dir_operations; |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 304 | sb->s_root = root_dentry = d_make_root(root_inode); |
| 305 | if (!root_dentry) |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 306 | return -ENOMEM; |
Michael Holzheu | 31cb4bd | 2007-02-05 21:18:29 +0100 | [diff] [blame] | 307 | if (MACHINE_IS_VM) |
| 308 | rc = hypfs_vm_create_files(sb, root_dentry); |
| 309 | else |
| 310 | rc = hypfs_diag_create_files(sb, root_dentry); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 311 | if (rc) |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 312 | return rc; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 313 | sbi->update_file = hypfs_create_update_file(sb, root_dentry); |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 314 | if (IS_ERR(sbi->update_file)) |
| 315 | return PTR_ERR(sbi->update_file); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 316 | hypfs_update_update(sb); |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 317 | pr_info("Hypervisor filesystem mounted\n"); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 318 | return 0; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 319 | } |
| 320 | |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 321 | static struct dentry *hypfs_mount(struct file_system_type *fst, int flags, |
| 322 | const char *devname, void *data) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 323 | { |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 324 | return mount_single(fst, flags, data, hypfs_fill_super); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | static void hypfs_kill_super(struct super_block *sb) |
| 328 | { |
| 329 | struct hypfs_sb_info *sb_info = sb->s_fs_info; |
| 330 | |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 331 | if (sb->s_root) |
Michael Holzheu | 388c571 | 2006-09-20 16:00:04 +0200 | [diff] [blame] | 332 | hypfs_delete_tree(sb->s_root); |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 333 | if (sb_info->update_file) |
Michael Holzheu | 388c571 | 2006-09-20 16:00:04 +0200 | [diff] [blame] | 334 | hypfs_remove(sb_info->update_file); |
Al Viro | f1771ff | 2010-01-25 18:36:07 -0500 | [diff] [blame] | 335 | kfree(sb->s_fs_info); |
| 336 | sb->s_fs_info = NULL; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 337 | kill_litter_super(sb); |
| 338 | } |
| 339 | |
| 340 | static struct dentry *hypfs_create_file(struct super_block *sb, |
| 341 | struct dentry *parent, const char *name, |
Al Viro | fec0eba | 2011-07-24 23:30:19 -0400 | [diff] [blame] | 342 | char *data, umode_t mode) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 343 | { |
| 344 | struct dentry *dentry; |
| 345 | struct inode *inode; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 346 | |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 347 | mutex_lock(&parent->d_inode->i_mutex); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 348 | dentry = lookup_one_len(name, parent, strlen(name)); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 349 | if (IS_ERR(dentry)) { |
| 350 | dentry = ERR_PTR(-ENOMEM); |
| 351 | goto fail; |
| 352 | } |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 353 | inode = hypfs_make_inode(sb, mode); |
| 354 | if (!inode) { |
| 355 | dput(dentry); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 356 | dentry = ERR_PTR(-ENOMEM); |
| 357 | goto fail; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 358 | } |
Al Viro | fec0eba | 2011-07-24 23:30:19 -0400 | [diff] [blame] | 359 | if (S_ISREG(mode)) { |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 360 | inode->i_fop = &hypfs_file_ops; |
| 361 | if (data) |
| 362 | inode->i_size = strlen(data); |
| 363 | else |
| 364 | inode->i_size = 0; |
Al Viro | fec0eba | 2011-07-24 23:30:19 -0400 | [diff] [blame] | 365 | } else if (S_ISDIR(mode)) { |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 366 | inode->i_op = &simple_dir_inode_operations; |
| 367 | inode->i_fop = &simple_dir_operations; |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 368 | inc_nlink(parent->d_inode); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 369 | } else |
| 370 | BUG(); |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 371 | inode->i_private = data; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 372 | d_instantiate(dentry, inode); |
| 373 | dget(dentry); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 374 | fail: |
| 375 | mutex_unlock(&parent->d_inode->i_mutex); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 376 | return dentry; |
| 377 | } |
| 378 | |
| 379 | struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, |
| 380 | const char *name) |
| 381 | { |
| 382 | struct dentry *dentry; |
| 383 | |
| 384 | dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); |
| 385 | if (IS_ERR(dentry)) |
| 386 | return dentry; |
| 387 | hypfs_add_dentry(dentry); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 388 | return dentry; |
| 389 | } |
| 390 | |
| 391 | static struct dentry *hypfs_create_update_file(struct super_block *sb, |
| 392 | struct dentry *dir) |
| 393 | { |
| 394 | struct dentry *dentry; |
| 395 | |
| 396 | dentry = hypfs_create_file(sb, dir, "update", NULL, |
| 397 | S_IFREG | UPDATE_FILE_MODE); |
| 398 | /* |
| 399 | * We do not put the update file on the 'delete' list with |
| 400 | * hypfs_add_dentry(), since it should not be removed when the tree |
| 401 | * is updated. |
| 402 | */ |
| 403 | return dentry; |
| 404 | } |
| 405 | |
| 406 | struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, |
| 407 | const char *name, __u64 value) |
| 408 | { |
| 409 | char *buffer; |
| 410 | char tmp[TMP_SIZE]; |
| 411 | struct dentry *dentry; |
| 412 | |
Michael Holzheu | ad2a5d8 | 2009-09-11 10:28:54 +0200 | [diff] [blame] | 413 | snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 414 | buffer = kstrdup(tmp, GFP_KERNEL); |
| 415 | if (!buffer) |
| 416 | return ERR_PTR(-ENOMEM); |
| 417 | dentry = |
| 418 | hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); |
| 419 | if (IS_ERR(dentry)) { |
| 420 | kfree(buffer); |
| 421 | return ERR_PTR(-ENOMEM); |
| 422 | } |
| 423 | hypfs_add_dentry(dentry); |
| 424 | return dentry; |
| 425 | } |
| 426 | |
| 427 | struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, |
| 428 | const char *name, char *string) |
| 429 | { |
| 430 | char *buffer; |
| 431 | struct dentry *dentry; |
| 432 | |
| 433 | buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); |
| 434 | if (!buffer) |
| 435 | return ERR_PTR(-ENOMEM); |
| 436 | sprintf(buffer, "%s\n", string); |
| 437 | dentry = |
| 438 | hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); |
| 439 | if (IS_ERR(dentry)) { |
| 440 | kfree(buffer); |
| 441 | return ERR_PTR(-ENOMEM); |
| 442 | } |
| 443 | hypfs_add_dentry(dentry); |
| 444 | return dentry; |
| 445 | } |
| 446 | |
Arjan van de Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 447 | static const struct file_operations hypfs_file_ops = { |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 448 | .open = hypfs_open, |
| 449 | .release = hypfs_release, |
| 450 | .read = do_sync_read, |
| 451 | .write = do_sync_write, |
| 452 | .aio_read = hypfs_aio_read, |
| 453 | .aio_write = hypfs_aio_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 454 | .llseek = no_llseek, |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 455 | }; |
| 456 | |
| 457 | static struct file_system_type hypfs_type = { |
| 458 | .owner = THIS_MODULE, |
| 459 | .name = "s390_hypfs", |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 460 | .mount = hypfs_mount, |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 461 | .kill_sb = hypfs_kill_super |
| 462 | }; |
| 463 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 464 | static const struct super_operations hypfs_s_ops = { |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 465 | .statfs = simple_statfs, |
Al Viro | b69257f | 2010-06-04 21:02:59 -0400 | [diff] [blame] | 466 | .evict_inode = hypfs_evict_inode, |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 467 | .show_options = hypfs_show_options, |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 468 | }; |
| 469 | |
Greg Kroah-Hartman | 9b47770 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 470 | static struct kobject *s390_kobj; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 471 | |
| 472 | static int __init hypfs_init(void) |
| 473 | { |
| 474 | int rc; |
| 475 | |
Michael Holzheu | 2fcb368 | 2011-01-05 12:47:43 +0100 | [diff] [blame] | 476 | rc = hypfs_dbfs_init(); |
| 477 | if (rc) |
| 478 | return rc; |
Michael Holzheu | 57b28f6 | 2010-05-17 10:00:20 +0200 | [diff] [blame] | 479 | if (hypfs_diag_init()) { |
| 480 | rc = -ENODATA; |
Michael Holzheu | 2fcb368 | 2011-01-05 12:47:43 +0100 | [diff] [blame] | 481 | goto fail_dbfs_exit; |
Michael Holzheu | 57b28f6 | 2010-05-17 10:00:20 +0200 | [diff] [blame] | 482 | } |
| 483 | if (hypfs_vm_init()) { |
| 484 | rc = -ENODATA; |
| 485 | goto fail_hypfs_diag_exit; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 486 | } |
Greg Kroah-Hartman | 9b47770 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 487 | s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); |
| 488 | if (!s390_kobj) { |
Joe Perches | a419aef | 2009-08-18 11:18:35 -0700 | [diff] [blame] | 489 | rc = -ENOMEM; |
Michael Holzheu | 57b28f6 | 2010-05-17 10:00:20 +0200 | [diff] [blame] | 490 | goto fail_hypfs_vm_exit; |
Greg Kroah-Hartman | 9b47770 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 491 | } |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 492 | rc = register_filesystem(&hypfs_type); |
| 493 | if (rc) |
| 494 | goto fail_filesystem; |
| 495 | return 0; |
| 496 | |
| 497 | fail_filesystem: |
Greg Kroah-Hartman | 38a382a | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 498 | kobject_put(s390_kobj); |
Michael Holzheu | 57b28f6 | 2010-05-17 10:00:20 +0200 | [diff] [blame] | 499 | fail_hypfs_vm_exit: |
| 500 | hypfs_vm_exit(); |
| 501 | fail_hypfs_diag_exit: |
| 502 | hypfs_diag_exit(); |
Michael Holzheu | 2fcb368 | 2011-01-05 12:47:43 +0100 | [diff] [blame] | 503 | fail_dbfs_exit: |
| 504 | hypfs_dbfs_exit(); |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 505 | pr_err("Initialization of hypfs failed with rc=%i\n", rc); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 506 | return rc; |
| 507 | } |
| 508 | |
| 509 | static void __exit hypfs_exit(void) |
| 510 | { |
Michael Holzheu | 57b28f6 | 2010-05-17 10:00:20 +0200 | [diff] [blame] | 511 | hypfs_diag_exit(); |
| 512 | hypfs_vm_exit(); |
Michael Holzheu | 2fcb368 | 2011-01-05 12:47:43 +0100 | [diff] [blame] | 513 | hypfs_dbfs_exit(); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 514 | unregister_filesystem(&hypfs_type); |
Greg Kroah-Hartman | 38a382a | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 515 | kobject_put(s390_kobj); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | module_init(hypfs_init) |
| 519 | module_exit(hypfs_exit) |
| 520 | |
| 521 | MODULE_LICENSE("GPL"); |
| 522 | MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); |
| 523 | MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); |