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> |
Al Viro | 918377b | 2010-06-06 23:56:02 -0400 | [diff] [blame] | 18 | #include <linux/pid_namespace.h> |
Al Viro | d6b722a | 2011-07-27 22:21:58 -0400 | [diff] [blame] | 19 | #include <linux/namei.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/uaccess.h> |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 21 | #include <os.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 23 | static struct inode *get_inode(struct super_block *, struct dentry *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | struct hppfs_data { |
| 26 | struct list_head list; |
| 27 | char contents[PAGE_SIZE - sizeof(struct list_head)]; |
| 28 | }; |
| 29 | |
| 30 | struct hppfs_private { |
| 31 | struct file *proc_file; |
| 32 | int host_fd; |
| 33 | loff_t len; |
| 34 | struct hppfs_data *contents; |
| 35 | }; |
| 36 | |
| 37 | struct hppfs_inode_info { |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 38 | struct dentry *proc_dentry; |
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; |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 57 | if (dentry->d_parent != sb->s_root) |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 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; |
Kees Cook | 096a8aa | 2013-07-03 15:04:55 -0700 | [diff] [blame] | 72 | int len, seg_len, root_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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"; |
Kees Cook | 096a8aa | 2013-07-03 15:04:55 -0700 | [diff] [blame] | 84 | root_len = strlen(root); |
| 85 | len += root_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | name = kmalloc(len + extra + 1, GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 87 | if (name == NULL) |
| 88 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | name[len] = '\0'; |
| 91 | parent = dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 92 | while (parent->d_parent != parent) { |
| 93 | if (is_pid(parent)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | seg_name = "pid"; |
Kees Cook | 096a8aa | 2013-07-03 15:04:55 -0700 | [diff] [blame] | 95 | seg_len = strlen(seg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | else { |
| 98 | seg_name = parent->d_name.name; |
| 99 | seg_len = parent->d_name.len; |
| 100 | } |
| 101 | |
| 102 | len -= seg_len + 1; |
| 103 | name[len] = '/'; |
Kees Cook | 096a8aa | 2013-07-03 15:04:55 -0700 | [diff] [blame] | 104 | memcpy(&name[len + 1], seg_name, seg_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | parent = parent->d_parent; |
| 106 | } |
Kees Cook | 096a8aa | 2013-07-03 15:04:55 -0700 | [diff] [blame] | 107 | memcpy(name, root, root_len); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 108 | return name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | static int file_removed(struct dentry *dentry, const char *file) |
| 112 | { |
| 113 | char *host_file; |
| 114 | int extra, fd; |
| 115 | |
| 116 | extra = 0; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 117 | if (file != NULL) |
| 118 | extra += strlen(file) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | host_file = dentry_name(dentry, extra + strlen("/remove")); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 121 | if (host_file == NULL) { |
| 122 | printk(KERN_ERR "file_removed : allocation failed\n"); |
| 123 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | } |
| 125 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 126 | if (file != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | strcat(host_file, "/"); |
| 128 | strcat(host_file, file); |
| 129 | } |
| 130 | strcat(host_file, "/remove"); |
| 131 | |
| 132 | fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); |
| 133 | kfree(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 134 | if (fd > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | os_close_file(fd); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 136 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 138 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 142 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
Al Viro | 0916a5e | 2011-07-17 22:27:22 -0400 | [diff] [blame] | 144 | struct dentry *proc_dentry, *parent; |
| 145 | struct qstr *name = &dentry->d_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | struct inode *inode; |
| 147 | int err, deleted; |
| 148 | |
| 149 | deleted = file_removed(dentry, NULL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 150 | if (deleted < 0) |
| 151 | return ERR_PTR(deleted); |
| 152 | else if (deleted) |
| 153 | return ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | parent = HPPFS_I(ino)->proc_dentry; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 156 | mutex_lock(&parent->d_inode->i_mutex); |
Al Viro | 0916a5e | 2011-07-17 22:27:22 -0400 | [diff] [blame] | 157 | proc_dentry = lookup_one_len(name->name, parent, name->len); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 158 | mutex_unlock(&parent->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 160 | if (IS_ERR(proc_dentry)) |
| 161 | return proc_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 163 | err = -ENOMEM; |
| 164 | inode = get_inode(ino->i_sb, proc_dentry); |
| 165 | if (!inode) |
Al Viro | 3cc0658 | 2011-07-17 22:24:15 -0400 | [diff] [blame] | 166 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
| 168 | d_add(dentry, inode); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 169 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | out: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 172 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 175 | static const struct inode_operations hppfs_file_iops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | }; |
| 177 | |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 178 | 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] | 179 | loff_t *ppos, int is_user) |
| 180 | { |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 181 | ssize_t (*read)(struct file *, char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | ssize_t n; |
| 183 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 184 | read = file_inode(file)->i_fop->read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 186 | if (!is_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | set_fs(KERNEL_DS); |
| 188 | |
| 189 | n = (*read)(file, buf, count, &file->f_pos); |
| 190 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 191 | if (!is_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | set_fs(USER_DS); |
| 193 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 194 | if (ppos) |
| 195 | *ppos = file->f_pos; |
Paolo 'Blaisorblade' Giarrusso | 8e0a218 | 2005-07-14 00:33:41 -0700 | [diff] [blame] | 196 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 199 | 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] | 200 | { |
| 201 | ssize_t n; |
| 202 | int cur, err; |
| 203 | char *new_buf; |
| 204 | |
| 205 | n = -ENOMEM; |
| 206 | new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 207 | if (new_buf == NULL) { |
| 208 | printk(KERN_ERR "hppfs_read_file : kmalloc failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | goto out; |
| 210 | } |
| 211 | n = 0; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 212 | while (count > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | cur = min_t(ssize_t, count, PAGE_SIZE); |
| 214 | err = os_read_file(fd, new_buf, cur); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 215 | if (err < 0) { |
| 216 | printk(KERN_ERR "hppfs_read : read failed, " |
| 217 | "errno = %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | n = err; |
| 219 | goto out_free; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 220 | } else if (err == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | break; |
| 222 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 223 | if (copy_to_user(buf, new_buf, err)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | n = -EFAULT; |
| 225 | goto out_free; |
| 226 | } |
| 227 | n += err; |
| 228 | count -= err; |
| 229 | } |
| 230 | out_free: |
| 231 | kfree(new_buf); |
| 232 | out: |
Paolo 'Blaisorblade' Giarrusso | 8e0a218 | 2005-07-14 00:33:41 -0700 | [diff] [blame] | 233 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | } |
| 235 | |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 236 | 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] | 237 | loff_t *ppos) |
| 238 | { |
| 239 | struct hppfs_private *hppfs = file->private_data; |
| 240 | struct hppfs_data *data; |
| 241 | loff_t off; |
| 242 | int err; |
| 243 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 244 | if (hppfs->contents != NULL) { |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 245 | int rem; |
| 246 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 247 | if (*ppos >= hppfs->len) |
| 248 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | data = hppfs->contents; |
| 251 | off = *ppos; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 252 | while (off >= sizeof(data->contents)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | data = list_entry(data->list.next, struct hppfs_data, |
| 254 | list); |
| 255 | off -= sizeof(data->contents); |
| 256 | } |
| 257 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 258 | if (off + count > hppfs->len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | count = hppfs->len - off; |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 260 | rem = copy_to_user(buf, &data->contents[off], count); |
| 261 | *ppos += count - rem; |
| 262 | if (rem > 0) |
| 263 | return -EFAULT; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 264 | } else if (hppfs->host_fd != -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | err = os_seek_file(hppfs->host_fd, *ppos); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 266 | if (err) { |
| 267 | printk(KERN_ERR "hppfs_read : seek failed, " |
| 268 | "errno = %d\n", err); |
| 269 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | } |
Roel Kluin | 880fe76 | 2009-04-02 16:57:18 -0700 | [diff] [blame] | 271 | err = hppfs_read_file(hppfs->host_fd, buf, count); |
| 272 | if (err < 0) { |
| 273 | printk(KERN_ERR "hppfs_read: read failed: %d\n", err); |
| 274 | return err; |
| 275 | } |
| 276 | count = err; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 277 | if (count > 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | *ppos += count; |
| 279 | } |
| 280 | else count = read_proc(hppfs->proc_file, buf, count, ppos, 1); |
| 281 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 282 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | } |
| 284 | |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 285 | static ssize_t hppfs_write(struct file *file, const char __user *buf, |
| 286 | size_t len, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | { |
| 288 | struct hppfs_private *data = file->private_data; |
| 289 | struct file *proc_file = data->proc_file; |
Al Viro | 347f217 | 2006-03-31 02:30:16 -0800 | [diff] [blame] | 290 | ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 292 | write = file_inode(proc_file)->i_fop->write; |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 293 | return (*write)(proc_file, buf, len, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | static int open_host_sock(char *host_file, int *filter_out) |
| 297 | { |
| 298 | char *end; |
| 299 | int fd; |
| 300 | |
| 301 | end = &host_file[strlen(host_file)]; |
| 302 | strcpy(end, "/rw"); |
| 303 | *filter_out = 1; |
| 304 | fd = os_connect_socket(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 305 | if (fd > 0) |
| 306 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
| 308 | strcpy(end, "/r"); |
| 309 | *filter_out = 0; |
| 310 | fd = os_connect_socket(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 311 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | static void free_contents(struct hppfs_data *head) |
| 315 | { |
| 316 | struct hppfs_data *data; |
| 317 | struct list_head *ele, *next; |
| 318 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 319 | if (head == NULL) |
| 320 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 322 | list_for_each_safe(ele, next, &head->list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | data = list_entry(ele, struct hppfs_data, list); |
| 324 | kfree(data); |
| 325 | } |
| 326 | kfree(head); |
| 327 | } |
| 328 | |
| 329 | static struct hppfs_data *hppfs_get_data(int fd, int filter, |
| 330 | struct file *proc_file, |
| 331 | struct file *hppfs_file, |
| 332 | loff_t *size_out) |
| 333 | { |
| 334 | struct hppfs_data *data, *new, *head; |
| 335 | int n, err; |
| 336 | |
| 337 | err = -ENOMEM; |
| 338 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 339 | if (data == NULL) { |
| 340 | printk(KERN_ERR "hppfs_get_data : head allocation failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | goto failed; |
| 342 | } |
| 343 | |
| 344 | INIT_LIST_HEAD(&data->list); |
| 345 | |
| 346 | head = data; |
| 347 | *size_out = 0; |
| 348 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 349 | if (filter) { |
| 350 | while ((n = read_proc(proc_file, data->contents, |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 351 | sizeof(data->contents), NULL, 0)) > 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | os_write_file(fd, data->contents, n); |
| 353 | err = os_shutdown_socket(fd, 0, 1); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 354 | if (err) { |
| 355 | printk(KERN_ERR "hppfs_get_data : failed to shut down " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | "socket\n"); |
| 357 | goto failed_free; |
| 358 | } |
| 359 | } |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 360 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | n = os_read_file(fd, data->contents, sizeof(data->contents)); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 362 | if (n < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | err = n; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 364 | printk(KERN_ERR "hppfs_get_data : read failed, " |
| 365 | "errno = %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | goto failed_free; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 367 | } else if (n == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | break; |
| 369 | |
| 370 | *size_out += n; |
| 371 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 372 | if (n < sizeof(data->contents)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | break; |
| 374 | |
| 375 | new = kmalloc(sizeof(*data), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 376 | if (new == 0) { |
| 377 | printk(KERN_ERR "hppfs_get_data : data allocation " |
| 378 | "failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | err = -ENOMEM; |
| 380 | goto failed_free; |
| 381 | } |
| 382 | |
| 383 | INIT_LIST_HEAD(&new->list); |
| 384 | list_add(&new->list, &data->list); |
| 385 | data = new; |
| 386 | } |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 387 | return head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
| 389 | failed_free: |
| 390 | free_contents(head); |
| 391 | failed: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 392 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | |
| 395 | static struct hppfs_private *hppfs_data(void) |
| 396 | { |
| 397 | struct hppfs_private *data; |
| 398 | |
| 399 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 400 | if (data == NULL) |
| 401 | return data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
| 403 | *data = ((struct hppfs_private ) { .host_fd = -1, |
| 404 | .len = -1, |
| 405 | .contents = NULL } ); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 406 | return data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | static int file_mode(int fmode) |
| 410 | { |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 411 | if (fmode == (FMODE_READ | FMODE_WRITE)) |
| 412 | return O_RDWR; |
| 413 | if (fmode == FMODE_READ) |
| 414 | return O_RDONLY; |
| 415 | if (fmode == FMODE_WRITE) |
| 416 | return O_WRONLY; |
| 417 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | |
| 420 | static int hppfs_open(struct inode *inode, struct file *file) |
| 421 | { |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 422 | const struct cred *cred = file->f_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | struct hppfs_private *data; |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 424 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | char *host_file; |
| 426 | int err, fd, type, filter; |
| 427 | |
| 428 | err = -ENOMEM; |
| 429 | data = hppfs_data(); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 430 | if (data == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | goto out; |
| 432 | |
Josef Sipek | 471b17e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 433 | host_file = dentry_name(file->f_path.dentry, strlen("/rw")); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 434 | if (host_file == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | goto out_free2; |
| 436 | |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 437 | path.mnt = inode->i_sb->s_fs_info; |
| 438 | path.dentry = HPPFS_I(inode)->proc_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 440 | data->proc_file = dentry_open(&path, file_mode(file->f_mode), cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | err = PTR_ERR(data->proc_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 442 | if (IS_ERR(data->proc_file)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | goto out_free1; |
| 444 | |
| 445 | type = os_file_type(host_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 446 | if (type == OS_TYPE_FILE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 448 | if (fd >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | data->host_fd = fd; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 450 | else |
| 451 | printk(KERN_ERR "hppfs_open : failed to open '%s', " |
| 452 | "errno = %d\n", host_file, -fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
| 454 | data->contents = NULL; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 455 | } else if (type == OS_TYPE_DIR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | fd = open_host_sock(host_file, &filter); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 457 | if (fd > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | data->contents = hppfs_get_data(fd, filter, |
Paolo 'Blaisorblade' Giarrusso | 3f58047 | 2005-07-07 17:56:51 -0700 | [diff] [blame] | 459 | data->proc_file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | file, &data->len); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 461 | if (!IS_ERR(data->contents)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | data->host_fd = fd; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 463 | } else |
| 464 | printk(KERN_ERR "hppfs_open : failed to open a socket " |
| 465 | "in '%s', errno = %d\n", host_file, -fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
| 467 | kfree(host_file); |
| 468 | |
| 469 | file->private_data = data; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 470 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | out_free1: |
| 473 | kfree(host_file); |
| 474 | out_free2: |
| 475 | free_contents(data->contents); |
| 476 | kfree(data); |
| 477 | out: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 478 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | static int hppfs_dir_open(struct inode *inode, struct file *file) |
| 482 | { |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 483 | const struct cred *cred = file->f_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | struct hppfs_private *data; |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 485 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | int err; |
| 487 | |
| 488 | err = -ENOMEM; |
| 489 | data = hppfs_data(); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 490 | if (data == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | goto out; |
| 492 | |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 493 | path.mnt = inode->i_sb->s_fs_info; |
| 494 | path.dentry = HPPFS_I(inode)->proc_dentry; |
| 495 | data->proc_file = dentry_open(&path, file_mode(file->f_mode), cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | err = PTR_ERR(data->proc_file); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 497 | if (IS_ERR(data->proc_file)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | goto out_free; |
| 499 | |
| 500 | file->private_data = data; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 501 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
| 503 | out_free: |
| 504 | kfree(data); |
| 505 | out: |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 506 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | static loff_t hppfs_llseek(struct file *file, loff_t off, int where) |
| 510 | { |
| 511 | struct hppfs_private *data = file->private_data; |
Paolo 'Blaisorblade' Giarrusso | 3f58047 | 2005-07-07 17:56:51 -0700 | [diff] [blame] | 512 | struct file *proc_file = data->proc_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | loff_t (*llseek)(struct file *, loff_t, int); |
| 514 | loff_t ret; |
| 515 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 516 | llseek = file_inode(proc_file)->i_fop->llseek; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 517 | if (llseek != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | ret = (*llseek)(proc_file, off, where); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 519 | if (ret < 0) |
| 520 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | } |
| 522 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 523 | return default_llseek(file, off, where); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
| 525 | |
Al Viro | b5edfd2 | 2013-04-14 15:34:01 -0400 | [diff] [blame] | 526 | static int hppfs_release(struct inode *inode, struct file *file) |
| 527 | { |
| 528 | struct hppfs_private *data = file->private_data; |
| 529 | struct file *proc_file = data->proc_file; |
| 530 | if (proc_file) |
| 531 | fput(proc_file); |
| 532 | kfree(data); |
| 533 | return 0; |
| 534 | } |
| 535 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 536 | static const struct file_operations hppfs_file_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | .owner = NULL, |
| 538 | .llseek = hppfs_llseek, |
| 539 | .read = hppfs_read, |
| 540 | .write = hppfs_write, |
| 541 | .open = hppfs_open, |
Al Viro | b5edfd2 | 2013-04-14 15:34:01 -0400 | [diff] [blame] | 542 | .release = hppfs_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | }; |
| 544 | |
| 545 | struct hppfs_dirent { |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 546 | struct dir_context ctx; |
| 547 | struct dir_context *caller; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | struct dentry *dentry; |
| 549 | }; |
| 550 | |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 551 | static int hppfs_filldir(struct dir_context *ctx, const char *name, int size, |
Al Viro | c8adf94 | 2006-10-09 20:26:58 +0100 | [diff] [blame] | 552 | loff_t offset, u64 inode, unsigned int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | { |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 554 | struct hppfs_dirent *dirent = |
| 555 | container_of(ctx, struct hppfs_dirent, ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 557 | if (file_removed(dirent->dentry, name)) |
| 558 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 560 | dirent->caller->pos = dirent->ctx.pos; |
| 561 | return !dir_emit(dirent->caller, name, size, inode, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | } |
| 563 | |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 564 | static int hppfs_readdir(struct file *file, struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | { |
| 566 | struct hppfs_private *data = file->private_data; |
Paolo 'Blaisorblade' Giarrusso | 3f58047 | 2005-07-07 17:56:51 -0700 | [diff] [blame] | 567 | struct file *proc_file = data->proc_file; |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 568 | struct hppfs_dirent d = { |
| 569 | .ctx.actor = hppfs_filldir, |
| 570 | .caller = ctx, |
| 571 | .dentry = file->f_path.dentry |
| 572 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | int err; |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 574 | proc_file->f_pos = ctx->pos; |
| 575 | err = iterate_dir(proc_file, &d.ctx); |
| 576 | ctx->pos = d.ctx.pos; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 577 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 580 | static const struct file_operations hppfs_dir_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | .owner = NULL, |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 582 | .iterate = hppfs_readdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | .open = hppfs_dir_open, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 584 | .llseek = default_llseek, |
Al Viro | b5edfd2 | 2013-04-14 15:34:01 -0400 | [diff] [blame] | 585 | .release = hppfs_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | }; |
| 587 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 588 | static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
| 590 | sf->f_blocks = 0; |
| 591 | sf->f_bfree = 0; |
| 592 | sf->f_bavail = 0; |
| 593 | sf->f_files = 0; |
| 594 | sf->f_ffree = 0; |
| 595 | sf->f_type = HPPFS_SUPER_MAGIC; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 596 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | static struct inode *hppfs_alloc_inode(struct super_block *sb) |
| 600 | { |
| 601 | struct hppfs_inode_info *hi; |
| 602 | |
| 603 | hi = kmalloc(sizeof(*hi), GFP_KERNEL); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 604 | if (!hi) |
| 605 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 607 | hi->proc_dentry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | inode_init_once(&hi->vfs_inode); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 609 | return &hi->vfs_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
| 611 | |
Al Viro | 33b0daa | 2010-06-07 00:12:50 -0400 | [diff] [blame] | 612 | void hppfs_evict_inode(struct inode *ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 614 | clear_inode(ino); |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 615 | dput(HPPFS_I(ino)->proc_dentry); |
| 616 | mntput(ino->i_sb->s_fs_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 619 | static void hppfs_i_callback(struct rcu_head *head) |
| 620 | { |
| 621 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 622 | kfree(HPPFS_I(inode)); |
| 623 | } |
| 624 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | static void hppfs_destroy_inode(struct inode *inode) |
| 626 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 627 | call_rcu(&inode->i_rcu, hppfs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | } |
| 629 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 630 | static const struct super_operations hppfs_sbops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | .alloc_inode = hppfs_alloc_inode, |
| 632 | .destroy_inode = hppfs_destroy_inode, |
Al Viro | 33b0daa | 2010-06-07 00:12:50 -0400 | [diff] [blame] | 633 | .evict_inode = hppfs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | .statfs = hppfs_statfs, |
| 635 | }; |
| 636 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 637 | static int hppfs_readlink(struct dentry *dentry, char __user *buffer, |
| 638 | int buflen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | { |
Al Viro | 7b264fc | 2009-12-23 00:43:50 -0500 | [diff] [blame] | 640 | struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 641 | return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, |
| 642 | buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
| 644 | |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 645 | static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | { |
Al Viro | 7b264fc | 2009-12-23 00:43:50 -0500 | [diff] [blame] | 647 | struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 648 | |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 649 | return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd); |
| 650 | } |
Paolo 'Blaisorblade' Giarrusso | d7a60d5 | 2005-08-26 16:57:44 +0200 | [diff] [blame] | 651 | |
Al Viro | 7b264fc | 2009-12-23 00:43:50 -0500 | [diff] [blame] | 652 | static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd, |
| 653 | void *cookie) |
| 654 | { |
| 655 | struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; |
| 656 | |
| 657 | if (proc_dentry->d_inode->i_op->put_link) |
| 658 | proc_dentry->d_inode->i_op->put_link(proc_dentry, nd, cookie); |
| 659 | } |
| 660 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 661 | static const struct inode_operations hppfs_dir_iops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | .lookup = hppfs_lookup, |
| 663 | }; |
| 664 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 665 | static const struct inode_operations hppfs_link_iops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | .readlink = hppfs_readlink, |
| 667 | .follow_link = hppfs_follow_link, |
Al Viro | 7b264fc | 2009-12-23 00:43:50 -0500 | [diff] [blame] | 668 | .put_link = hppfs_put_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | }; |
| 670 | |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 671 | static struct inode *get_inode(struct super_block *sb, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 673 | struct inode *proc_ino = dentry->d_inode; |
| 674 | struct inode *inode = new_inode(sb); |
| 675 | |
Al Viro | 3cc0658 | 2011-07-17 22:24:15 -0400 | [diff] [blame] | 676 | if (!inode) { |
| 677 | dput(dentry); |
Wei Yongjun | 91312c5 | 2012-09-21 12:55:02 +0800 | [diff] [blame] | 678 | return NULL; |
Al Viro | 3cc0658 | 2011-07-17 22:24:15 -0400 | [diff] [blame] | 679 | } |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 680 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 681 | if (S_ISDIR(dentry->d_inode->i_mode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | inode->i_op = &hppfs_dir_iops; |
| 683 | inode->i_fop = &hppfs_dir_fops; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 684 | } else if (S_ISLNK(dentry->d_inode->i_mode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | inode->i_op = &hppfs_link_iops; |
| 686 | inode->i_fop = &hppfs_file_fops; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 687 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | inode->i_op = &hppfs_file_iops; |
| 689 | inode->i_fop = &hppfs_file_fops; |
| 690 | } |
| 691 | |
Al Viro | 3cc0658 | 2011-07-17 22:24:15 -0400 | [diff] [blame] | 692 | HPPFS_I(inode)->proc_dentry = dentry; |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 693 | |
| 694 | inode->i_uid = proc_ino->i_uid; |
| 695 | inode->i_gid = proc_ino->i_gid; |
| 696 | inode->i_atime = proc_ino->i_atime; |
| 697 | inode->i_mtime = proc_ino->i_mtime; |
| 698 | inode->i_ctime = proc_ino->i_ctime; |
| 699 | inode->i_ino = proc_ino->i_ino; |
| 700 | inode->i_mode = proc_ino->i_mode; |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 701 | set_nlink(inode, proc_ino->i_nlink); |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 702 | inode->i_size = proc_ino->i_size; |
| 703 | inode->i_blocks = proc_ino->i_blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Jeff Dike | a0612b1 | 2008-05-12 14:01:49 -0700 | [diff] [blame] | 705 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | static int hppfs_fill_super(struct super_block *sb, void *d, int silent) |
| 709 | { |
| 710 | struct inode *root_inode; |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 711 | struct vfsmount *proc_mnt; |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 712 | int err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
Eric W. Biederman | 17cf22c | 2010-03-02 14:51:53 -0800 | [diff] [blame] | 714 | proc_mnt = mntget(task_active_pid_ns(current)->proc_mnt); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 715 | if (IS_ERR(proc_mnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | goto out; |
| 717 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | sb->s_blocksize = 1024; |
| 719 | sb->s_blocksize_bits = 10; |
| 720 | sb->s_magic = HPPFS_SUPER_MAGIC; |
| 721 | sb->s_op = &hppfs_sbops; |
Al Viro | f382d6e | 2008-02-23 04:53:53 -0500 | [diff] [blame] | 722 | sb->s_fs_info = proc_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | err = -ENOMEM; |
Al Viro | 4c1d5a6 | 2011-12-07 18:21:57 -0500 | [diff] [blame] | 725 | root_inode = get_inode(sb, dget(proc_mnt->mnt_root)); |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 726 | sb->s_root = d_make_root(root_inode); |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 727 | if (!sb->s_root) |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 728 | goto out_mntput; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 730 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 732 | out_mntput: |
| 733 | mntput(proc_mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | out: |
| 735 | return(err); |
| 736 | } |
| 737 | |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 738 | static struct dentry *hppfs_read_super(struct file_system_type *type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 739 | int flags, const char *dev_name, |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 740 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 742 | return mount_nodev(type, flags, data, hppfs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | static struct file_system_type hppfs_type = { |
| 746 | .owner = THIS_MODULE, |
| 747 | .name = "hppfs", |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 748 | .mount = hppfs_read_super, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | .kill_sb = kill_anon_super, |
| 750 | .fs_flags = 0, |
| 751 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 752 | MODULE_ALIAS_FS("hppfs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
| 754 | static int __init init_hppfs(void) |
| 755 | { |
Dave Hansen | 1dd0dd1 | 2008-02-15 18:37:00 -0500 | [diff] [blame] | 756 | return register_filesystem(&hppfs_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | static void __exit exit_hppfs(void) |
| 760 | { |
| 761 | unregister_filesystem(&hppfs_type); |
| 762 | } |
| 763 | |
| 764 | module_init(init_hppfs) |
| 765 | module_exit(exit_hppfs) |
| 766 | MODULE_LICENSE("GPL"); |