Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 2 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/ctype.h> |
| 7 | #include <linux/dcache.h> |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 8 | #include <linux/file.h> |
| 9 | #include <linux/fs.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/list.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/mount.h> |
| 15 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/statfs.h> |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 17 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include "os.h" |
| 20 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 21 | static int init_inode(struct inode *inode, struct dentry *dentry, |
| 22 | struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | struct hppfs_data { |
| 25 | struct list_head list; |
| 26 | char contents[PAGE_SIZE - sizeof(struct list_head)]; |
| 27 | }; |
| 28 | |
| 29 | struct hppfs_private { |
| 30 | struct file *proc_file; |
| 31 | int host_fd; |
| 32 | loff_t len; |
| 33 | struct hppfs_data *contents; |
| 34 | }; |
| 35 | |
| 36 | struct hppfs_inode_info { |
| 37 | struct dentry *proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 38 | struct vfsmount *proc_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | struct inode vfs_inode; |
| 40 | }; |
| 41 | |
| 42 | static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode) |
| 43 | { |
Paolo 'Blaisorblade' Giarrusso | fd589e0 | 2005-08-26 16:57:53 +0200 | [diff] [blame] | 44 | return container_of(inode, struct hppfs_inode_info, vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | } |
| 46 | |
| 47 | #define HPPFS_SUPER_MAGIC 0xb00000ee |
| 48 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 49 | static const struct super_operations hppfs_sbops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | static int is_pid(struct dentry *dentry) |
| 52 | { |
| 53 | struct super_block *sb; |
| 54 | int i; |
| 55 | |
| 56 | sb = dentry->d_sb; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 57 | if ((sb->s_op != &hppfs_sbops) || (dentry->d_parent != sb->s_root)) |
| 58 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 60 | for (i = 0; i < dentry->d_name.len; i++) { |
| 61 | if (!isdigit(dentry->d_name.name[i])) |
| 62 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 64 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | static char *dentry_name(struct dentry *dentry, int extra) |
| 68 | { |
| 69 | struct dentry *parent; |
| 70 | char *root, *name; |
| 71 | const char *seg_name; |
| 72 | int len, seg_len; |
| 73 | |
| 74 | len = 0; |
| 75 | parent = dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 76 | while (parent->d_parent != parent) { |
| 77 | if (is_pid(parent)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | len += strlen("pid") + 1; |
| 79 | else len += parent->d_name.len + 1; |
| 80 | parent = parent->d_parent; |
| 81 | } |
| 82 | |
| 83 | root = "proc"; |
| 84 | len += strlen(root); |
| 85 | name = kmalloc(len + extra + 1, GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 86 | if (name == NULL) |
| 87 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | name[len] = '\0'; |
| 90 | parent = dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 91 | while (parent->d_parent != parent) { |
| 92 | if (is_pid(parent)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | seg_name = "pid"; |
| 94 | seg_len = strlen("pid"); |
| 95 | } |
| 96 | else { |
| 97 | seg_name = parent->d_name.name; |
| 98 | seg_len = parent->d_name.len; |
| 99 | } |
| 100 | |
| 101 | len -= seg_len + 1; |
| 102 | name[len] = '/'; |
| 103 | strncpy(&name[len + 1], seg_name, seg_len); |
| 104 | parent = parent->d_parent; |
| 105 | } |
| 106 | strncpy(name, root, strlen(root)); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 107 | return name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | static int file_removed(struct dentry *dentry, const char *file) |
| 111 | { |
| 112 | char *host_file; |
| 113 | int extra, fd; |
| 114 | |
| 115 | extra = 0; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 116 | if (file != NULL) |
| 117 | extra += strlen(file) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | host_file = dentry_name(dentry, extra + strlen("/remove")); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 120 | if (host_file == NULL) { |
| 121 | printk(KERN_ERR "file_removed : allocation failed\n"); |
| 122 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 125 | if (file != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | strcat(host_file, "/"); |
| 127 | strcat(host_file, file); |
| 128 | } |
| 129 | strcat(host_file, "/remove"); |
| 130 | |
| 131 | fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); |
| 132 | kfree(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 133 | if (fd > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | os_close_file(fd); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 135 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 137 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static void hppfs_read_inode(struct inode *ino) |
| 141 | { |
| 142 | struct inode *proc_ino; |
| 143 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 144 | if (HPPFS_I(ino)->proc_dentry == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | return; |
| 146 | |
| 147 | proc_ino = HPPFS_I(ino)->proc_dentry->d_inode; |
| 148 | ino->i_uid = proc_ino->i_uid; |
| 149 | ino->i_gid = proc_ino->i_gid; |
| 150 | ino->i_atime = proc_ino->i_atime; |
| 151 | ino->i_mtime = proc_ino->i_mtime; |
| 152 | ino->i_ctime = proc_ino->i_ctime; |
| 153 | ino->i_ino = proc_ino->i_ino; |
| 154 | ino->i_mode = proc_ino->i_mode; |
| 155 | ino->i_nlink = proc_ino->i_nlink; |
| 156 | ino->i_size = proc_ino->i_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | ino->i_blocks = proc_ino->i_blocks; |
| 158 | } |
| 159 | |
David Howells | 755aedc | 2008-02-07 00:15:51 -0800 | [diff] [blame] | 160 | static struct inode *hppfs_iget(struct super_block *sb) |
| 161 | { |
| 162 | struct inode *inode; |
| 163 | |
| 164 | inode = iget_locked(sb, 0); |
| 165 | if (!inode) |
| 166 | return ERR_PTR(-ENOMEM); |
| 167 | if (inode->i_state & I_NEW) { |
| 168 | hppfs_read_inode(inode); |
| 169 | unlock_new_inode(inode); |
| 170 | } |
| 171 | return inode; |
| 172 | } |
| 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry, |
| 175 | struct nameidata *nd) |
| 176 | { |
| 177 | struct dentry *proc_dentry, *new, *parent; |
| 178 | struct inode *inode; |
| 179 | int err, deleted; |
| 180 | |
| 181 | deleted = file_removed(dentry, NULL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 182 | if (deleted < 0) |
| 183 | return ERR_PTR(deleted); |
| 184 | else if (deleted) |
| 185 | return ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
| 187 | err = -ENOMEM; |
| 188 | parent = HPPFS_I(ino)->proc_dentry; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 189 | mutex_lock(&parent->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | proc_dentry = d_lookup(parent, &dentry->d_name); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 191 | if (proc_dentry == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | proc_dentry = d_alloc(parent, &dentry->d_name); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 193 | if (proc_dentry == NULL) { |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 194 | mutex_unlock(&parent->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | goto out; |
| 196 | } |
| 197 | new = (*parent->d_inode->i_op->lookup)(parent->d_inode, |
| 198 | proc_dentry, NULL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 199 | if (new) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | dput(proc_dentry); |
| 201 | proc_dentry = new; |
| 202 | } |
| 203 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 204 | mutex_unlock(&parent->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 206 | if (IS_ERR(proc_dentry)) |
| 207 | return proc_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
David Howells | 755aedc | 2008-02-07 00:15:51 -0800 | [diff] [blame] | 209 | inode = hppfs_iget(ino->i_sb); |
| 210 | if (IS_ERR(inode)) { |
| 211 | err = PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | goto out_dput; |
David Howells | 755aedc | 2008-02-07 00:15:51 -0800 | [diff] [blame] | 213 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 215 | err = init_inode(inode, proc_dentry, HPPFS_I(ino)->proc_mnt); |
| 216 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | goto out_put; |
| 218 | |
| 219 | hppfs_read_inode(inode); |
| 220 | |
| 221 | d_add(dentry, inode); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 222 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | out_put: |
| 225 | iput(inode); |
| 226 | out_dput: |
| 227 | dput(proc_dentry); |
| 228 | out: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 229 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 232 | static const struct inode_operations hppfs_file_iops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | }; |
| 234 | |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 235 | static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | loff_t *ppos, int is_user) |
| 237 | { |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 238 | ssize_t (*read)(struct file *, char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | ssize_t n; |
| 240 | |
Josef Sipek | 471b17e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 241 | read = file->f_path.dentry->d_inode->i_fop->read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 243 | if (!is_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | set_fs(KERNEL_DS); |
| 245 | |
| 246 | n = (*read)(file, buf, count, &file->f_pos); |
| 247 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 248 | if (!is_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | set_fs(USER_DS); |
| 250 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 251 | if (ppos) |
| 252 | *ppos = file->f_pos; |
Paolo 'Blaisorblade' Giarrusso | 8e0a218 | 2005-07-14 00:33:41 -0700 | [diff] [blame] | 253 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 256 | static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
| 258 | ssize_t n; |
| 259 | int cur, err; |
| 260 | char *new_buf; |
| 261 | |
| 262 | n = -ENOMEM; |
| 263 | new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 264 | if (new_buf == NULL) { |
| 265 | printk(KERN_ERR "hppfs_read_file : kmalloc failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | goto out; |
| 267 | } |
| 268 | n = 0; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 269 | while (count > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | cur = min_t(ssize_t, count, PAGE_SIZE); |
| 271 | err = os_read_file(fd, new_buf, cur); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 272 | if (err < 0) { |
| 273 | printk(KERN_ERR "hppfs_read : read failed, " |
| 274 | "errno = %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | n = err; |
| 276 | goto out_free; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 277 | } else if (err == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | break; |
| 279 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 280 | if (copy_to_user(buf, new_buf, err)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | n = -EFAULT; |
| 282 | goto out_free; |
| 283 | } |
| 284 | n += err; |
| 285 | count -= err; |
| 286 | } |
| 287 | out_free: |
| 288 | kfree(new_buf); |
| 289 | out: |
Paolo 'Blaisorblade' Giarrusso | 8e0a218 | 2005-07-14 00:33:41 -0700 | [diff] [blame] | 290 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | } |
| 292 | |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 293 | static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | loff_t *ppos) |
| 295 | { |
| 296 | struct hppfs_private *hppfs = file->private_data; |
| 297 | struct hppfs_data *data; |
| 298 | loff_t off; |
| 299 | int err; |
| 300 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 301 | if (hppfs->contents != NULL) { |
| 302 | if (*ppos >= hppfs->len) |
| 303 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | data = hppfs->contents; |
| 306 | off = *ppos; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 307 | while (off >= sizeof(data->contents)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | data = list_entry(data->list.next, struct hppfs_data, |
| 309 | list); |
| 310 | off -= sizeof(data->contents); |
| 311 | } |
| 312 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 313 | if (off + count > hppfs->len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | count = hppfs->len - off; |
| 315 | copy_to_user(buf, &data->contents[off], count); |
| 316 | *ppos += count; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 317 | } else if (hppfs->host_fd != -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | err = os_seek_file(hppfs->host_fd, *ppos); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 319 | if (err) { |
| 320 | printk(KERN_ERR "hppfs_read : seek failed, " |
| 321 | "errno = %d\n", err); |
| 322 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | count = hppfs_read_file(hppfs->host_fd, buf, count); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 325 | if (count > 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | *ppos += count; |
| 327 | } |
| 328 | else count = read_proc(hppfs->proc_file, buf, count, ppos, 1); |
| 329 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 330 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
| 332 | |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 333 | static ssize_t hppfs_write(struct file *file, const char __user *buf, size_t len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | loff_t *ppos) |
| 335 | { |
| 336 | struct hppfs_private *data = file->private_data; |
| 337 | struct file *proc_file = data->proc_file; |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 338 | ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | int err; |
| 340 | |
Josef Sipek | 471b17e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 341 | write = proc_file->f_path.dentry->d_inode->i_fop->write; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | proc_file->f_pos = file->f_pos; |
| 344 | err = (*write)(proc_file, buf, len, &proc_file->f_pos); |
| 345 | file->f_pos = proc_file->f_pos; |
| 346 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 347 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | static int open_host_sock(char *host_file, int *filter_out) |
| 351 | { |
| 352 | char *end; |
| 353 | int fd; |
| 354 | |
| 355 | end = &host_file[strlen(host_file)]; |
| 356 | strcpy(end, "/rw"); |
| 357 | *filter_out = 1; |
| 358 | fd = os_connect_socket(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 359 | if (fd > 0) |
| 360 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | strcpy(end, "/r"); |
| 363 | *filter_out = 0; |
| 364 | fd = os_connect_socket(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 365 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | static void free_contents(struct hppfs_data *head) |
| 369 | { |
| 370 | struct hppfs_data *data; |
| 371 | struct list_head *ele, *next; |
| 372 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 373 | if (head == NULL) |
| 374 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 376 | list_for_each_safe(ele, next, &head->list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | data = list_entry(ele, struct hppfs_data, list); |
| 378 | kfree(data); |
| 379 | } |
| 380 | kfree(head); |
| 381 | } |
| 382 | |
| 383 | static struct hppfs_data *hppfs_get_data(int fd, int filter, |
| 384 | struct file *proc_file, |
| 385 | struct file *hppfs_file, |
| 386 | loff_t *size_out) |
| 387 | { |
| 388 | struct hppfs_data *data, *new, *head; |
| 389 | int n, err; |
| 390 | |
| 391 | err = -ENOMEM; |
| 392 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 393 | if (data == NULL) { |
| 394 | printk(KERN_ERR "hppfs_get_data : head allocation failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | goto failed; |
| 396 | } |
| 397 | |
| 398 | INIT_LIST_HEAD(&data->list); |
| 399 | |
| 400 | head = data; |
| 401 | *size_out = 0; |
| 402 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 403 | if (filter) { |
| 404 | while ((n = read_proc(proc_file, data->contents, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | sizeof(data->contents), NULL, 0)) > 0) |
| 406 | os_write_file(fd, data->contents, n); |
| 407 | err = os_shutdown_socket(fd, 0, 1); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 408 | if (err) { |
| 409 | printk(KERN_ERR "hppfs_get_data : failed to shut down " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | "socket\n"); |
| 411 | goto failed_free; |
| 412 | } |
| 413 | } |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 414 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | n = os_read_file(fd, data->contents, sizeof(data->contents)); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 416 | if (n < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | err = n; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 418 | printk(KERN_ERR "hppfs_get_data : read failed, " |
| 419 | "errno = %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | goto failed_free; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 421 | } else if (n == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | break; |
| 423 | |
| 424 | *size_out += n; |
| 425 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 426 | if (n < sizeof(data->contents)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | break; |
| 428 | |
| 429 | new = kmalloc(sizeof(*data), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 430 | if (new == 0) { |
| 431 | printk(KERN_ERR "hppfs_get_data : data allocation " |
| 432 | "failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | err = -ENOMEM; |
| 434 | goto failed_free; |
| 435 | } |
| 436 | |
| 437 | INIT_LIST_HEAD(&new->list); |
| 438 | list_add(&new->list, &data->list); |
| 439 | data = new; |
| 440 | } |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 441 | return head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
| 443 | failed_free: |
| 444 | free_contents(head); |
| 445 | failed: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 446 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | static struct hppfs_private *hppfs_data(void) |
| 450 | { |
| 451 | struct hppfs_private *data; |
| 452 | |
| 453 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 454 | if (data == NULL) |
| 455 | return data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
| 457 | *data = ((struct hppfs_private ) { .host_fd = -1, |
| 458 | .len = -1, |
| 459 | .contents = NULL } ); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 460 | return data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | static int file_mode(int fmode) |
| 464 | { |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 465 | if (fmode == (FMODE_READ | FMODE_WRITE)) |
| 466 | return O_RDWR; |
| 467 | if (fmode == FMODE_READ) |
| 468 | return O_RDONLY; |
| 469 | if (fmode == FMODE_WRITE) |
| 470 | return O_WRONLY; |
| 471 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | static int hppfs_open(struct inode *inode, struct file *file) |
| 475 | { |
| 476 | struct hppfs_private *data; |
| 477 | struct dentry *proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 478 | struct vfsmount *proc_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | char *host_file; |
| 480 | int err, fd, type, filter; |
| 481 | |
| 482 | err = -ENOMEM; |
| 483 | data = hppfs_data(); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 484 | if (data == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | goto out; |
| 486 | |
Josef Sipek | 471b17e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 487 | host_file = dentry_name(file->f_path.dentry, strlen("/rw")); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 488 | if (host_file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | goto out_free2; |
| 490 | |
| 491 | proc_dentry = HPPFS_I(inode)->proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 492 | proc_mnt = HPPFS_I(inode)->proc_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | /* XXX This isn't closed anywhere */ |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 495 | data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | file_mode(file->f_mode)); |
| 497 | err = PTR_ERR(data->proc_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 498 | if (IS_ERR(data->proc_file)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | goto out_free1; |
| 500 | |
| 501 | type = os_file_type(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 502 | if (type == OS_TYPE_FILE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 504 | if (fd >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | data->host_fd = fd; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 506 | else |
| 507 | printk(KERN_ERR "hppfs_open : failed to open '%s', " |
| 508 | "errno = %d\n", host_file, -fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
| 510 | data->contents = NULL; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 511 | } else if (type == OS_TYPE_DIR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | fd = open_host_sock(host_file, &filter); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 513 | if (fd > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | data->contents = hppfs_get_data(fd, filter, |
Paolo 'Blaisorblade' Giarrusso | 3f58047 | 2005-07-07 17:56:51 -0700 | [diff] [blame] | 515 | data->proc_file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | file, &data->len); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 517 | if (!IS_ERR(data->contents)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | data->host_fd = fd; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 519 | } else |
| 520 | printk(KERN_ERR "hppfs_open : failed to open a socket " |
| 521 | "in '%s', errno = %d\n", host_file, -fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | kfree(host_file); |
| 524 | |
| 525 | file->private_data = data; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 526 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
| 528 | out_free1: |
| 529 | kfree(host_file); |
| 530 | out_free2: |
| 531 | free_contents(data->contents); |
| 532 | kfree(data); |
| 533 | out: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 534 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | |
| 537 | static int hppfs_dir_open(struct inode *inode, struct file *file) |
| 538 | { |
| 539 | struct hppfs_private *data; |
| 540 | struct dentry *proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 541 | struct vfsmount *proc_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | int err; |
| 543 | |
| 544 | err = -ENOMEM; |
| 545 | data = hppfs_data(); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 546 | if (data == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | goto out; |
| 548 | |
| 549 | proc_dentry = HPPFS_I(inode)->proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 550 | proc_mnt = HPPFS_I(inode)->proc_mnt; |
| 551 | data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | file_mode(file->f_mode)); |
| 553 | err = PTR_ERR(data->proc_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 554 | if (IS_ERR(data->proc_file)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | goto out_free; |
| 556 | |
| 557 | file->private_data = data; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 558 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
| 560 | out_free: |
| 561 | kfree(data); |
| 562 | out: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 563 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | static loff_t hppfs_llseek(struct file *file, loff_t off, int where) |
| 567 | { |
| 568 | struct hppfs_private *data = file->private_data; |
Paolo 'Blaisorblade' Giarrusso | 3f58047 | 2005-07-07 17:56:51 -0700 | [diff] [blame] | 569 | struct file *proc_file = data->proc_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | loff_t (*llseek)(struct file *, loff_t, int); |
| 571 | loff_t ret; |
| 572 | |
Josef Sipek | 471b17e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 573 | llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 574 | if (llseek != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | ret = (*llseek)(proc_file, off, where); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 576 | if (ret < 0) |
| 577 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 580 | return default_llseek(file, off, where); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
| 582 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 583 | static const struct file_operations hppfs_file_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | .owner = NULL, |
| 585 | .llseek = hppfs_llseek, |
| 586 | .read = hppfs_read, |
| 587 | .write = hppfs_write, |
| 588 | .open = hppfs_open, |
| 589 | }; |
| 590 | |
| 591 | struct hppfs_dirent { |
| 592 | void *vfs_dirent; |
| 593 | filldir_t filldir; |
| 594 | struct dentry *dentry; |
| 595 | }; |
| 596 | |
| 597 | static int hppfs_filldir(void *d, const char *name, int size, |
Al Viro | c8adf94 | 2006-10-09 20:26:58 +0100 | [diff] [blame] | 598 | loff_t offset, u64 inode, unsigned int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | { |
| 600 | struct hppfs_dirent *dirent = d; |
| 601 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 602 | if (file_removed(dirent->dentry, name)) |
| 603 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 605 | return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset, |
| 606 | inode, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | |
| 609 | static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir) |
| 610 | { |
| 611 | struct hppfs_private *data = file->private_data; |
Paolo 'Blaisorblade' Giarrusso | 3f58047 | 2005-07-07 17:56:51 -0700 | [diff] [blame] | 612 | struct file *proc_file = data->proc_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | int (*readdir)(struct file *, void *, filldir_t); |
| 614 | struct hppfs_dirent dirent = ((struct hppfs_dirent) |
| 615 | { .vfs_dirent = ent, |
| 616 | .filldir = filldir, |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 617 | .dentry = file->f_path.dentry |
| 618 | }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | int err; |
| 620 | |
Josef Sipek | 471b17e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 621 | readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
| 623 | proc_file->f_pos = file->f_pos; |
| 624 | err = (*readdir)(proc_file, &dirent, hppfs_filldir); |
| 625 | file->f_pos = proc_file->f_pos; |
| 626 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 627 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync) |
| 631 | { |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 632 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 635 | static const struct file_operations hppfs_dir_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | .owner = NULL, |
| 637 | .readdir = hppfs_readdir, |
| 638 | .open = hppfs_dir_open, |
| 639 | .fsync = hppfs_fsync, |
| 640 | }; |
| 641 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 642 | static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
| 644 | sf->f_blocks = 0; |
| 645 | sf->f_bfree = 0; |
| 646 | sf->f_bavail = 0; |
| 647 | sf->f_files = 0; |
| 648 | sf->f_ffree = 0; |
| 649 | sf->f_type = HPPFS_SUPER_MAGIC; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 650 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | static struct inode *hppfs_alloc_inode(struct super_block *sb) |
| 654 | { |
| 655 | struct hppfs_inode_info *hi; |
| 656 | |
| 657 | hi = kmalloc(sizeof(*hi), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 658 | if (!hi) |
| 659 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 661 | hi->proc_dentry = NULL; |
| 662 | hi->proc_mnt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | inode_init_once(&hi->vfs_inode); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 664 | return &hi->vfs_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | void hppfs_delete_inode(struct inode *ino) |
| 668 | { |
| 669 | clear_inode(ino); |
| 670 | } |
| 671 | |
| 672 | static void hppfs_destroy_inode(struct inode *inode) |
| 673 | { |
| 674 | kfree(HPPFS_I(inode)); |
| 675 | } |
| 676 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 677 | static void hppfs_put_super(struct super_block *sb) |
| 678 | { |
| 679 | mntput(HPPFS_I(sb->s_root->d_inode)->proc_mnt); |
| 680 | } |
| 681 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 682 | static const struct super_operations hppfs_sbops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | .alloc_inode = hppfs_alloc_inode, |
| 684 | .destroy_inode = hppfs_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | .delete_inode = hppfs_delete_inode, |
| 686 | .statfs = hppfs_statfs, |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 687 | .put_super = hppfs_put_super, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | }; |
| 689 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 690 | static int hppfs_readlink(struct dentry *dentry, char __user *buffer, |
| 691 | int buflen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | { |
| 693 | struct file *proc_file; |
| 694 | struct dentry *proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 695 | struct vfsmount *proc_mnt; |
Paolo 'Blaisorblade' Giarrusso | fd589e0 | 2005-08-26 16:57:53 +0200 | [diff] [blame] | 696 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
| 698 | proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 699 | proc_mnt = HPPFS_I(dentry->d_inode)->proc_mnt; |
| 700 | |
| 701 | proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), O_RDONLY); |
Paolo 'Blaisorblade' Giarrusso | fd589e0 | 2005-08-26 16:57:53 +0200 | [diff] [blame] | 702 | if (IS_ERR(proc_file)) |
| 703 | return PTR_ERR(proc_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Paolo 'Blaisorblade' Giarrusso | fd589e0 | 2005-08-26 16:57:53 +0200 | [diff] [blame] | 705 | ret = proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | fput(proc_file); |
| 708 | |
Paolo 'Blaisorblade' Giarrusso | fd589e0 | 2005-08-26 16:57:53 +0200 | [diff] [blame] | 709 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | } |
| 711 | |
Paolo 'Blaisorblade' Giarrusso | d7a60d5 | 2005-08-26 16:57:44 +0200 | [diff] [blame] | 712 | static void* hppfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | { |
| 714 | struct file *proc_file; |
| 715 | struct dentry *proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 716 | struct vfsmount *proc_mnt; |
Paolo 'Blaisorblade' Giarrusso | d7a60d5 | 2005-08-26 16:57:44 +0200 | [diff] [blame] | 717 | void *ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | |
| 719 | proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 720 | proc_mnt = HPPFS_I(dentry->d_inode)->proc_mnt; |
| 721 | |
| 722 | proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), O_RDONLY); |
Paolo 'Blaisorblade' Giarrusso | fd589e0 | 2005-08-26 16:57:53 +0200 | [diff] [blame] | 723 | if (IS_ERR(proc_file)) |
| 724 | return proc_file; |
Paolo 'Blaisorblade' Giarrusso | d7a60d5 | 2005-08-26 16:57:44 +0200 | [diff] [blame] | 725 | |
Paolo 'Blaisorblade' Giarrusso | fd589e0 | 2005-08-26 16:57:53 +0200 | [diff] [blame] | 726 | ret = proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
| 728 | fput(proc_file); |
| 729 | |
Paolo 'Blaisorblade' Giarrusso | d7a60d5 | 2005-08-26 16:57:44 +0200 | [diff] [blame] | 730 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | } |
| 732 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 733 | static const struct inode_operations hppfs_dir_iops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | .lookup = hppfs_lookup, |
| 735 | }; |
| 736 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 737 | static const struct inode_operations hppfs_link_iops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | .readlink = hppfs_readlink, |
| 739 | .follow_link = hppfs_follow_link, |
| 740 | }; |
| 741 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 742 | static int init_inode(struct inode *inode, struct dentry *dentry, |
| 743 | struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | { |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 745 | if (S_ISDIR(dentry->d_inode->i_mode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | inode->i_op = &hppfs_dir_iops; |
| 747 | inode->i_fop = &hppfs_dir_fops; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 748 | } else if (S_ISLNK(dentry->d_inode->i_mode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | inode->i_op = &hppfs_link_iops; |
| 750 | inode->i_fop = &hppfs_file_fops; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 751 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | inode->i_op = &hppfs_file_iops; |
| 753 | inode->i_fop = &hppfs_file_fops; |
| 754 | } |
| 755 | |
| 756 | HPPFS_I(inode)->proc_dentry = dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 757 | HPPFS_I(inode)->proc_mnt = mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 759 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | static int hppfs_fill_super(struct super_block *sb, void *d, int silent) |
| 763 | { |
| 764 | struct inode *root_inode; |
| 765 | struct file_system_type *procfs; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 766 | struct vfsmount *proc_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | int err; |
| 768 | |
| 769 | err = -ENOENT; |
| 770 | procfs = get_fs_type("proc"); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 771 | if (!procfs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | goto out; |
| 773 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 774 | proc_mnt = vfs_kern_mount(procfs, 0, procfs->name, NULL); |
| 775 | put_filesystem(procfs); |
| 776 | if (IS_ERR(proc_mnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | goto out; |
| 778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | sb->s_blocksize = 1024; |
| 780 | sb->s_blocksize_bits = 10; |
| 781 | sb->s_magic = HPPFS_SUPER_MAGIC; |
| 782 | sb->s_op = &hppfs_sbops; |
| 783 | |
David Howells | 755aedc | 2008-02-07 00:15:51 -0800 | [diff] [blame] | 784 | root_inode = hppfs_iget(sb); |
| 785 | if (IS_ERR(root_inode)) { |
| 786 | err = PTR_ERR(root_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | goto out; |
David Howells | 755aedc | 2008-02-07 00:15:51 -0800 | [diff] [blame] | 788 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 790 | err = init_inode(root_inode, proc_mnt->mnt_sb->s_root, proc_mnt); |
| 791 | if (err) |
| 792 | goto out_iput; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | err = -ENOMEM; |
| 795 | sb->s_root = d_alloc_root(root_inode); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 796 | if (!sb->s_root) |
| 797 | goto out_iput; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
| 799 | hppfs_read_inode(root_inode); |
| 800 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 801 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 803 | out_iput: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | iput(root_inode); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 805 | out_mntput: |
| 806 | mntput(proc_mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | out: |
| 808 | return(err); |
| 809 | } |
| 810 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 811 | static int hppfs_read_super(struct file_system_type *type, |
| 812 | int flags, const char *dev_name, |
| 813 | void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 815 | return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | } |
| 817 | |
| 818 | static struct file_system_type hppfs_type = { |
| 819 | .owner = THIS_MODULE, |
| 820 | .name = "hppfs", |
| 821 | .get_sb = hppfs_read_super, |
| 822 | .kill_sb = kill_anon_super, |
| 823 | .fs_flags = 0, |
| 824 | }; |
| 825 | |
| 826 | static int __init init_hppfs(void) |
| 827 | { |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame^] | 828 | return register_filesystem(&hppfs_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | static void __exit exit_hppfs(void) |
| 832 | { |
| 833 | unregister_filesystem(&hppfs_type); |
| 834 | } |
| 835 | |
| 836 | module_init(init_hppfs) |
| 837 | module_exit(exit_hppfs) |
| 838 | MODULE_LICENSE("GPL"); |