1 /* 2 * linux/fs/hfsplus/ioctl.c 3 * 4 * Copyright (C) 2003 5 * Ethan Benson <erbenson@alaska.net> 6 * partially derived from linux/fs/ext2/ioctl.c 7 * Copyright (C) 1993, 1994, 1995 8 * Remy Card (card@masi.ibp.fr) 9 * Laboratoire MASI - Institut Blaise Pascal 10 * Universite Pierre et Marie Curie (Paris VI) 11 * 12 * hfsplus ioctls 13 */ 14 15 #include <linux/capability.h> 16 #include <linux/fs.h> 17 #include <linux/mount.h> 18 #include <linux/sched.h> 19 #include <linux/xattr.h> 20 #include <asm/uaccess.h> 21 #include "hfsplus_fs.h" 22 23 /* 24 * "Blessing" an HFS+ filesystem writes metadata to the superblock informing 25 * the platform firmware which file to boot from 26 */ 27 static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags) 28 { 29 struct dentry *dentry = file->f_path.dentry; 30 struct inode *inode = dentry->d_inode; 31 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 32 struct hfsplus_vh *vh = sbi->s_vhdr; 33 struct hfsplus_vh *bvh = sbi->s_backup_vhdr; 34 u32 cnid = (unsigned long)dentry->d_fsdata; 35 36 if (!capable(CAP_SYS_ADMIN)) 37 return -EPERM; 38 39 mutex_lock(&sbi->vh_mutex); 40 41 /* Directory containing the bootable system */ 42 vh->finder_info[0] = bvh->finder_info[0] = 43 cpu_to_be32(parent_ino(dentry)); 44 45 /* 46 * Bootloader. Just using the inode here breaks in the case of 47 * hard links - the firmware wants the ID of the hard link file, 48 * but the inode points at the indirect inode 49 */ 50 vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid); 51 52 /* Per spec, the OS X system folder - same as finder_info[0] here */ 53 vh->finder_info[5] = bvh->finder_info[5] = 54 cpu_to_be32(parent_ino(dentry)); 55 56 mutex_unlock(&sbi->vh_mutex); 57 return 0; 58 } 59 60 static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) 61 { 62 struct inode *inode = file->f_path.dentry->d_inode; 63 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 64 unsigned int flags = 0; 65 66 if (inode->i_flags & S_IMMUTABLE) 67 flags |= FS_IMMUTABLE_FL; 68 if (inode->i_flags & S_APPEND) 69 flags |= FS_APPEND_FL; 70 if (hip->userflags & HFSPLUS_FLG_NODUMP) 71 flags |= FS_NODUMP_FL; 72 73 return put_user(flags, user_flags); 74 } 75 76 static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) 77 { 78 struct inode *inode = file->f_path.dentry->d_inode; 79 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 80 unsigned int flags; 81 int err = 0; 82 83 err = mnt_want_write_file(file); 84 if (err) 85 goto out; 86 87 if (!inode_owner_or_capable(inode)) { 88 err = -EACCES; 89 goto out_drop_write; 90 } 91 92 if (get_user(flags, user_flags)) { 93 err = -EFAULT; 94 goto out_drop_write; 95 } 96 97 mutex_lock(&inode->i_mutex); 98 99 if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) || 100 inode->i_flags & (S_IMMUTABLE|S_APPEND)) { 101 if (!capable(CAP_LINUX_IMMUTABLE)) { 102 err = -EPERM; 103 goto out_unlock_inode; 104 } 105 } 106 107 /* don't silently ignore unsupported ext2 flags */ 108 if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) { 109 err = -EOPNOTSUPP; 110 goto out_unlock_inode; 111 } 112 113 if (flags & FS_IMMUTABLE_FL) 114 inode->i_flags |= S_IMMUTABLE; 115 else 116 inode->i_flags &= ~S_IMMUTABLE; 117 118 if (flags & FS_APPEND_FL) 119 inode->i_flags |= S_APPEND; 120 else 121 inode->i_flags &= ~S_APPEND; 122 123 if (flags & FS_NODUMP_FL) 124 hip->userflags |= HFSPLUS_FLG_NODUMP; 125 else 126 hip->userflags &= ~HFSPLUS_FLG_NODUMP; 127 128 inode->i_ctime = CURRENT_TIME_SEC; 129 mark_inode_dirty(inode); 130 131 out_unlock_inode: 132 mutex_unlock(&inode->i_mutex); 133 out_drop_write: 134 mnt_drop_write_file(file); 135 out: 136 return err; 137 } 138 139 long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 140 { 141 void __user *argp = (void __user *)arg; 142 143 switch (cmd) { 144 case HFSPLUS_IOC_EXT2_GETFLAGS: 145 return hfsplus_ioctl_getflags(file, argp); 146 case HFSPLUS_IOC_EXT2_SETFLAGS: 147 return hfsplus_ioctl_setflags(file, argp); 148 case HFSPLUS_IOC_BLESS: 149 return hfsplus_ioctl_bless(file, argp); 150 default: 151 return -ENOTTY; 152 } 153 } 154 155 int hfsplus_setxattr(struct dentry *dentry, const char *name, 156 const void *value, size_t size, int flags) 157 { 158 struct inode *inode = dentry->d_inode; 159 struct hfs_find_data fd; 160 hfsplus_cat_entry entry; 161 struct hfsplus_cat_file *file; 162 int res; 163 164 if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode)) 165 return -EOPNOTSUPP; 166 167 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 168 if (res) 169 return res; 170 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 171 if (res) 172 goto out; 173 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 174 sizeof(struct hfsplus_cat_file)); 175 file = &entry.file; 176 177 if (!strcmp(name, "hfs.type")) { 178 if (size == 4) 179 memcpy(&file->user_info.fdType, value, 4); 180 else 181 res = -ERANGE; 182 } else if (!strcmp(name, "hfs.creator")) { 183 if (size == 4) 184 memcpy(&file->user_info.fdCreator, value, 4); 185 else 186 res = -ERANGE; 187 } else 188 res = -EOPNOTSUPP; 189 if (!res) { 190 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 191 sizeof(struct hfsplus_cat_file)); 192 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); 193 } 194 out: 195 hfs_find_exit(&fd); 196 return res; 197 } 198 199 ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name, 200 void *value, size_t size) 201 { 202 struct inode *inode = dentry->d_inode; 203 struct hfs_find_data fd; 204 hfsplus_cat_entry entry; 205 struct hfsplus_cat_file *file; 206 ssize_t res = 0; 207 208 if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode)) 209 return -EOPNOTSUPP; 210 211 if (size) { 212 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 213 if (res) 214 return res; 215 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 216 if (res) 217 goto out; 218 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 219 sizeof(struct hfsplus_cat_file)); 220 } 221 file = &entry.file; 222 223 if (!strcmp(name, "hfs.type")) { 224 if (size >= 4) { 225 memcpy(value, &file->user_info.fdType, 4); 226 res = 4; 227 } else 228 res = size ? -ERANGE : 4; 229 } else if (!strcmp(name, "hfs.creator")) { 230 if (size >= 4) { 231 memcpy(value, &file->user_info.fdCreator, 4); 232 res = 4; 233 } else 234 res = size ? -ERANGE : 4; 235 } else 236 res = -EOPNOTSUPP; 237 out: 238 if (size) 239 hfs_find_exit(&fd); 240 return res; 241 } 242 243 #define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type")) 244 245 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size) 246 { 247 struct inode *inode = dentry->d_inode; 248 249 if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode)) 250 return -EOPNOTSUPP; 251 252 if (!buffer || !size) 253 return HFSPLUS_ATTRLIST_SIZE; 254 if (size < HFSPLUS_ATTRLIST_SIZE) 255 return -ERANGE; 256 strcpy(buffer, "hfs.type"); 257 strcpy(buffer + sizeof("hfs.type"), "hfs.creator"); 258 259 return HFSPLUS_ATTRLIST_SIZE; 260 } 261