Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 1 | /* |
Michael Holzheu | f19bfb2 | 2006-09-20 15:58:44 +0200 | [diff] [blame] | 2 | * arch/s390/hypfs/inode.c |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 3 | * Hypervisor filesystem for Linux on s390. |
| 4 | * |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 5 | * Copyright IBM Corp. 2006, 2008 |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 6 | * Author(s): Michael Holzheu <holzheu@de.ibm.com> |
| 7 | */ |
| 8 | |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 9 | #define KMSG_COMPONENT "hypfs" |
| 10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 11 | |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 12 | #include <linux/types.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/fs.h> |
| 15 | #include <linux/namei.h> |
| 16 | #include <linux/vfs.h> |
| 17 | #include <linux/pagemap.h> |
| 18 | #include <linux/gfp.h> |
| 19 | #include <linux/time.h> |
| 20 | #include <linux/parser.h> |
| 21 | #include <linux/sysfs.h> |
| 22 | #include <linux/module.h> |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/mount.h> |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 25 | #include <asm/ebcdic.h> |
| 26 | #include "hypfs.h" |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 27 | |
| 28 | #define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */ |
| 29 | #define TMP_SIZE 64 /* size of temporary buffers */ |
| 30 | |
| 31 | static struct dentry *hypfs_create_update_file(struct super_block *sb, |
| 32 | struct dentry *dir); |
| 33 | |
| 34 | struct 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 Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 42 | static const struct file_operations hypfs_file_ops; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 43 | static struct file_system_type hypfs_type; |
| 44 | static struct super_operations hypfs_s_ops; |
| 45 | |
| 46 | /* start of list of all dentries, which have to be deleted on update */ |
| 47 | static struct dentry *hypfs_last_dentry; |
| 48 | |
| 49 | static 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 | |
| 60 | static void hypfs_add_dentry(struct dentry *dentry) |
| 61 | { |
| 62 | dentry->d_fsdata = hypfs_last_dentry; |
| 63 | hypfs_last_dentry = dentry; |
| 64 | } |
| 65 | |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 66 | static inline int hypfs_positive(struct dentry *dentry) |
| 67 | { |
| 68 | return dentry->d_inode && !d_unhashed(dentry); |
| 69 | } |
| 70 | |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 71 | static void hypfs_remove(struct dentry *dentry) |
| 72 | { |
| 73 | struct dentry *parent; |
| 74 | |
| 75 | parent = dentry->d_parent; |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 76 | 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 Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 85 | d_delete(dentry); |
| 86 | dput(dentry); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 87 | mutex_unlock(&parent->d_inode->i_mutex); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static 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 | |
| 100 | static 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 Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 109 | 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 | |
| 118 | static void hypfs_drop_inode(struct inode *inode) |
| 119 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 120 | kfree(inode->i_private); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 121 | generic_delete_inode(inode); |
| 122 | } |
| 123 | |
| 124 | static int hypfs_open(struct inode *inode, struct file *filp) |
| 125 | { |
Josef Sipek | d20343e | 2006-12-08 02:37:35 -0800 | [diff] [blame] | 126 | char *data = filp->f_path.dentry->d_inode->i_private; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 127 | 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 | } |
| 148 | return 0; |
| 149 | } |
| 150 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 151 | static ssize_t hypfs_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 152 | unsigned long nr_segs, loff_t offset) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 153 | { |
| 154 | char *data; |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 155 | ssize_t ret; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 156 | struct file *filp = iocb->ki_filp; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 157 | /* XXX: temporary */ |
| 158 | char __user *buf = iov[0].iov_base; |
| 159 | size_t count = iov[0].iov_len; |
| 160 | |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 161 | if (nr_segs != 1) |
| 162 | return -EINVAL; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 163 | |
| 164 | data = filp->private_data; |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 165 | 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 Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 170 | file_accessed(filp); |
Akinobu Mita | a29591c | 2008-07-14 09:59:16 +0200 | [diff] [blame] | 171 | |
| 172 | return ret; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 173 | } |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 174 | static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 175 | unsigned long nr_segs, loff_t offset) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 176 | { |
| 177 | int rc; |
| 178 | struct super_block *sb; |
| 179 | struct hypfs_sb_info *fs_info; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 180 | size_t count = iov_length(iov, nr_segs); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 181 | |
Josef Sipek | d20343e | 2006-12-08 02:37:35 -0800 | [diff] [blame] | 182 | sb = iocb->ki_filp->f_path.dentry->d_inode->i_sb; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 183 | 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 Holzheu | 31cb4bd | 2007-02-05 21:18:29 +0100 | [diff] [blame] | 200 | 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 Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 204 | if (rc) { |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 205 | pr_err("Updating the hypfs tree failed\n"); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 206 | hypfs_delete_tree(sb->s_root); |
| 207 | goto out; |
| 208 | } |
| 209 | hypfs_update_update(sb); |
| 210 | rc = count; |
| 211 | out: |
| 212 | mutex_unlock(&fs_info->lock); |
| 213 | return rc; |
| 214 | } |
| 215 | |
| 216 | static int hypfs_release(struct inode *inode, struct file *filp) |
| 217 | { |
| 218 | kfree(filp->private_data); |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | enum { opt_uid, opt_gid, opt_err }; |
| 223 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 224 | static const match_table_t hypfs_tokens = { |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 225 | {opt_uid, "uid=%u"}, |
| 226 | {opt_gid, "gid=%u"}, |
| 227 | {opt_err, NULL} |
| 228 | }; |
| 229 | |
| 230 | static 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 Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 257 | pr_err("%s is not a valid mount option\n", str); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 258 | return -EINVAL; |
| 259 | } |
| 260 | } |
| 261 | return 0; |
| 262 | } |
| 263 | |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 264 | static 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 Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 273 | static 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 Howells | e542370 | 2008-11-14 10:38:39 +1100 | [diff] [blame] | 284 | sbi->uid = current_uid(); |
| 285 | sbi->gid = current_gid(); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 286 | 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; |
| 291 | if (hypfs_parse_options(data, sb)) { |
| 292 | rc = -EINVAL; |
| 293 | goto err_alloc; |
| 294 | } |
| 295 | root_inode = hypfs_make_inode(sb, S_IFDIR | 0755); |
| 296 | if (!root_inode) { |
| 297 | rc = -ENOMEM; |
| 298 | goto err_alloc; |
| 299 | } |
| 300 | root_inode->i_op = &simple_dir_inode_operations; |
| 301 | root_inode->i_fop = &simple_dir_operations; |
| 302 | root_dentry = d_alloc_root(root_inode); |
| 303 | if (!root_dentry) { |
| 304 | iput(root_inode); |
| 305 | rc = -ENOMEM; |
| 306 | goto err_alloc; |
| 307 | } |
Michael Holzheu | 31cb4bd | 2007-02-05 21:18:29 +0100 | [diff] [blame] | 308 | if (MACHINE_IS_VM) |
| 309 | rc = hypfs_vm_create_files(sb, root_dentry); |
| 310 | else |
| 311 | rc = hypfs_diag_create_files(sb, root_dentry); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 312 | if (rc) |
| 313 | goto err_tree; |
| 314 | sbi->update_file = hypfs_create_update_file(sb, root_dentry); |
| 315 | if (IS_ERR(sbi->update_file)) { |
| 316 | rc = PTR_ERR(sbi->update_file); |
| 317 | goto err_tree; |
| 318 | } |
| 319 | hypfs_update_update(sb); |
| 320 | sb->s_root = root_dentry; |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 321 | pr_info("Hypervisor filesystem mounted\n"); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 322 | return 0; |
| 323 | |
| 324 | err_tree: |
| 325 | hypfs_delete_tree(root_dentry); |
| 326 | d_genocide(root_dentry); |
| 327 | dput(root_dentry); |
| 328 | err_alloc: |
| 329 | kfree(sbi); |
| 330 | return rc; |
| 331 | } |
| 332 | |
Andrew Morton | a5cf4b9 | 2006-06-23 04:01:35 -0700 | [diff] [blame] | 333 | static int hypfs_get_super(struct file_system_type *fst, int flags, |
| 334 | const char *devname, void *data, struct vfsmount *mnt) |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 335 | { |
Andrew Morton | a5cf4b9 | 2006-06-23 04:01:35 -0700 | [diff] [blame] | 336 | return get_sb_single(fst, flags, data, hypfs_fill_super, mnt); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | static void hypfs_kill_super(struct super_block *sb) |
| 340 | { |
| 341 | struct hypfs_sb_info *sb_info = sb->s_fs_info; |
| 342 | |
Michael Holzheu | 388c571 | 2006-09-20 16:00:04 +0200 | [diff] [blame] | 343 | if (sb->s_root) { |
| 344 | hypfs_delete_tree(sb->s_root); |
| 345 | hypfs_remove(sb_info->update_file); |
| 346 | kfree(sb->s_fs_info); |
| 347 | sb->s_fs_info = NULL; |
| 348 | } |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 349 | kill_litter_super(sb); |
| 350 | } |
| 351 | |
| 352 | static struct dentry *hypfs_create_file(struct super_block *sb, |
| 353 | struct dentry *parent, const char *name, |
| 354 | char *data, mode_t mode) |
| 355 | { |
| 356 | struct dentry *dentry; |
| 357 | struct inode *inode; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 358 | |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 359 | mutex_lock(&parent->d_inode->i_mutex); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 360 | dentry = lookup_one_len(name, parent, strlen(name)); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 361 | if (IS_ERR(dentry)) { |
| 362 | dentry = ERR_PTR(-ENOMEM); |
| 363 | goto fail; |
| 364 | } |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 365 | inode = hypfs_make_inode(sb, mode); |
| 366 | if (!inode) { |
| 367 | dput(dentry); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 368 | dentry = ERR_PTR(-ENOMEM); |
| 369 | goto fail; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 370 | } |
| 371 | if (mode & S_IFREG) { |
| 372 | inode->i_fop = &hypfs_file_ops; |
| 373 | if (data) |
| 374 | inode->i_size = strlen(data); |
| 375 | else |
| 376 | inode->i_size = 0; |
| 377 | } else if (mode & S_IFDIR) { |
| 378 | inode->i_op = &simple_dir_inode_operations; |
| 379 | inode->i_fop = &simple_dir_operations; |
| 380 | parent->d_inode->i_nlink++; |
| 381 | } else |
| 382 | BUG(); |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 383 | inode->i_private = data; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 384 | d_instantiate(dentry, inode); |
| 385 | dget(dentry); |
Michael Holzheu | 9b5a03e | 2007-08-22 13:51:43 +0200 | [diff] [blame] | 386 | fail: |
| 387 | mutex_unlock(&parent->d_inode->i_mutex); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 388 | return dentry; |
| 389 | } |
| 390 | |
| 391 | struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent, |
| 392 | const char *name) |
| 393 | { |
| 394 | struct dentry *dentry; |
| 395 | |
| 396 | dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE); |
| 397 | if (IS_ERR(dentry)) |
| 398 | return dentry; |
| 399 | hypfs_add_dentry(dentry); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 400 | return dentry; |
| 401 | } |
| 402 | |
| 403 | static struct dentry *hypfs_create_update_file(struct super_block *sb, |
| 404 | struct dentry *dir) |
| 405 | { |
| 406 | struct dentry *dentry; |
| 407 | |
| 408 | dentry = hypfs_create_file(sb, dir, "update", NULL, |
| 409 | S_IFREG | UPDATE_FILE_MODE); |
| 410 | /* |
| 411 | * We do not put the update file on the 'delete' list with |
| 412 | * hypfs_add_dentry(), since it should not be removed when the tree |
| 413 | * is updated. |
| 414 | */ |
| 415 | return dentry; |
| 416 | } |
| 417 | |
| 418 | struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir, |
| 419 | const char *name, __u64 value) |
| 420 | { |
| 421 | char *buffer; |
| 422 | char tmp[TMP_SIZE]; |
| 423 | struct dentry *dentry; |
| 424 | |
Michael Holzheu | ad2a5d8 | 2009-09-11 10:28:54 +0200 | [diff] [blame] | 425 | snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 426 | buffer = kstrdup(tmp, GFP_KERNEL); |
| 427 | if (!buffer) |
| 428 | return ERR_PTR(-ENOMEM); |
| 429 | dentry = |
| 430 | hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); |
| 431 | if (IS_ERR(dentry)) { |
| 432 | kfree(buffer); |
| 433 | return ERR_PTR(-ENOMEM); |
| 434 | } |
| 435 | hypfs_add_dentry(dentry); |
| 436 | return dentry; |
| 437 | } |
| 438 | |
| 439 | struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir, |
| 440 | const char *name, char *string) |
| 441 | { |
| 442 | char *buffer; |
| 443 | struct dentry *dentry; |
| 444 | |
| 445 | buffer = kmalloc(strlen(string) + 2, GFP_KERNEL); |
| 446 | if (!buffer) |
| 447 | return ERR_PTR(-ENOMEM); |
| 448 | sprintf(buffer, "%s\n", string); |
| 449 | dentry = |
| 450 | hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE); |
| 451 | if (IS_ERR(dentry)) { |
| 452 | kfree(buffer); |
| 453 | return ERR_PTR(-ENOMEM); |
| 454 | } |
| 455 | hypfs_add_dentry(dentry); |
| 456 | return dentry; |
| 457 | } |
| 458 | |
Arjan van de Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 459 | static const struct file_operations hypfs_file_ops = { |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 460 | .open = hypfs_open, |
| 461 | .release = hypfs_release, |
| 462 | .read = do_sync_read, |
| 463 | .write = do_sync_write, |
| 464 | .aio_read = hypfs_aio_read, |
| 465 | .aio_write = hypfs_aio_write, |
| 466 | }; |
| 467 | |
| 468 | static struct file_system_type hypfs_type = { |
| 469 | .owner = THIS_MODULE, |
| 470 | .name = "s390_hypfs", |
| 471 | .get_sb = hypfs_get_super, |
| 472 | .kill_sb = hypfs_kill_super |
| 473 | }; |
| 474 | |
| 475 | static struct super_operations hypfs_s_ops = { |
| 476 | .statfs = simple_statfs, |
| 477 | .drop_inode = hypfs_drop_inode, |
Michael Holzheu | b01af5b | 2007-08-10 14:32:27 +0200 | [diff] [blame] | 478 | .show_options = hypfs_show_options, |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 479 | }; |
| 480 | |
Greg Kroah-Hartman | 9b47770 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 481 | static struct kobject *s390_kobj; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 482 | |
| 483 | static int __init hypfs_init(void) |
| 484 | { |
| 485 | int rc; |
| 486 | |
Michael Holzheu | 31cb4bd | 2007-02-05 21:18:29 +0100 | [diff] [blame] | 487 | if (MACHINE_IS_VM) { |
| 488 | if (hypfs_vm_init()) |
| 489 | /* no diag 2fc, just exit */ |
| 490 | return -ENODATA; |
| 491 | } else { |
| 492 | if (hypfs_diag_init()) { |
| 493 | rc = -ENODATA; |
| 494 | goto fail_diag; |
| 495 | } |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 496 | } |
Greg Kroah-Hartman | 9b47770 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 497 | s390_kobj = kobject_create_and_add("s390", hypervisor_kobj); |
| 498 | if (!s390_kobj) { |
| 499 | rc = -ENOMEM;; |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 500 | goto fail_sysfs; |
Greg Kroah-Hartman | 9b47770 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 501 | } |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 502 | rc = register_filesystem(&hypfs_type); |
| 503 | if (rc) |
| 504 | goto fail_filesystem; |
| 505 | return 0; |
| 506 | |
| 507 | fail_filesystem: |
Greg Kroah-Hartman | 38a382a | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 508 | kobject_put(s390_kobj); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 509 | fail_sysfs: |
Michael Holzheu | 31cb4bd | 2007-02-05 21:18:29 +0100 | [diff] [blame] | 510 | if (!MACHINE_IS_VM) |
| 511 | hypfs_diag_exit(); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 512 | fail_diag: |
Michael Holzheu | f55495b | 2008-12-25 13:39:39 +0100 | [diff] [blame] | 513 | pr_err("Initialization of hypfs failed with rc=%i\n", rc); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 514 | return rc; |
| 515 | } |
| 516 | |
| 517 | static void __exit hypfs_exit(void) |
| 518 | { |
Michael Holzheu | 31cb4bd | 2007-02-05 21:18:29 +0100 | [diff] [blame] | 519 | if (!MACHINE_IS_VM) |
| 520 | hypfs_diag_exit(); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 521 | unregister_filesystem(&hypfs_type); |
Greg Kroah-Hartman | 38a382a | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 522 | kobject_put(s390_kobj); |
Michael Holzheu | 24bbb1f | 2006-06-23 02:05:06 -0700 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | module_init(hypfs_init) |
| 526 | module_exit(hypfs_exit) |
| 527 | |
| 528 | MODULE_LICENSE("GPL"); |
| 529 | MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>"); |
| 530 | MODULE_DESCRIPTION("s390 Hypervisor Filesystem"); |