| 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 | static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) |
| 24 | { |
| 25 | struct inode *inode = file->f_path.dentry->d_inode; |
| 26 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
| 27 | unsigned int flags = 0; |
| 28 | |
| 29 | if (inode->i_flags & S_IMMUTABLE) |
| 30 | flags |= FS_IMMUTABLE_FL; |
| 31 | if (inode->i_flags & S_APPEND) |
| 32 | flags |= FS_APPEND_FL; |
| 33 | if (hip->userflags & HFSPLUS_FLG_NODUMP) |
| 34 | flags |= FS_NODUMP_FL; |
| 35 | |
| 36 | return put_user(flags, user_flags); |
| 37 | } |
| 38 | |
| 39 | static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) |
| 40 | { |
| 41 | struct inode *inode = file->f_path.dentry->d_inode; |
| 42 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
| 43 | unsigned int flags; |
| 44 | int err = 0; |
| 45 | |
| 46 | err = mnt_want_write(file->f_path.mnt); |
| 47 | if (err) |
| 48 | goto out; |
| 49 | |
| 50 | if (!inode_owner_or_capable(inode)) { |
| 51 | err = -EACCES; |
| 52 | goto out_drop_write; |
| 53 | } |
| 54 | |
| 55 | if (get_user(flags, user_flags)) { |
| 56 | err = -EFAULT; |
| 57 | goto out_drop_write; |
| 58 | } |
| 59 | |
| 60 | mutex_lock(&inode->i_mutex); |
| 61 | |
| 62 | if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) || |
| 63 | inode->i_flags & (S_IMMUTABLE|S_APPEND)) { |
| 64 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
| 65 | err = -EPERM; |
| 66 | goto out_unlock_inode; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /* don't silently ignore unsupported ext2 flags */ |
| 71 | if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) { |
| 72 | err = -EOPNOTSUPP; |
| 73 | goto out_unlock_inode; |
| 74 | } |
| 75 | |
| 76 | if (flags & FS_IMMUTABLE_FL) |
| 77 | inode->i_flags |= S_IMMUTABLE; |
| 78 | else |
| 79 | inode->i_flags &= ~S_IMMUTABLE; |
| 80 | |
| 81 | if (flags & FS_APPEND_FL) |
| 82 | inode->i_flags |= S_APPEND; |
| 83 | else |
| 84 | inode->i_flags &= ~S_APPEND; |
| 85 | |
| 86 | if (flags & FS_NODUMP_FL) |
| 87 | hip->userflags |= HFSPLUS_FLG_NODUMP; |
| 88 | else |
| 89 | hip->userflags &= ~HFSPLUS_FLG_NODUMP; |
| 90 | |
| 91 | inode->i_ctime = CURRENT_TIME_SEC; |
| 92 | mark_inode_dirty(inode); |
| 93 | |
| 94 | out_unlock_inode: |
| 95 | mutex_unlock(&inode->i_mutex); |
| 96 | out_drop_write: |
| 97 | mnt_drop_write(file->f_path.mnt); |
| 98 | out: |
| 99 | return err; |
| 100 | } |
| 101 | |
| 102 | long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 103 | { |
| 104 | void __user *argp = (void __user *)arg; |
| 105 | |
| 106 | switch (cmd) { |
| 107 | case HFSPLUS_IOC_EXT2_GETFLAGS: |
| 108 | return hfsplus_ioctl_getflags(file, argp); |
| 109 | case HFSPLUS_IOC_EXT2_SETFLAGS: |
| 110 | return hfsplus_ioctl_setflags(file, argp); |
| 111 | default: |
| 112 | return -ENOTTY; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | int hfsplus_setxattr(struct dentry *dentry, const char *name, |
| 117 | const void *value, size_t size, int flags) |
| 118 | { |
| 119 | struct inode *inode = dentry->d_inode; |
| 120 | struct hfs_find_data fd; |
| 121 | hfsplus_cat_entry entry; |
| 122 | struct hfsplus_cat_file *file; |
| 123 | int res; |
| 124 | |
| 125 | if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode)) |
| 126 | return -EOPNOTSUPP; |
| 127 | |
| 128 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); |
| 129 | if (res) |
| 130 | return res; |
| 131 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); |
| 132 | if (res) |
| 133 | goto out; |
| 134 | hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, |
| 135 | sizeof(struct hfsplus_cat_file)); |
| 136 | file = &entry.file; |
| 137 | |
| 138 | if (!strcmp(name, "hfs.type")) { |
| 139 | if (size == 4) |
| 140 | memcpy(&file->user_info.fdType, value, 4); |
| 141 | else |
| 142 | res = -ERANGE; |
| 143 | } else if (!strcmp(name, "hfs.creator")) { |
| 144 | if (size == 4) |
| 145 | memcpy(&file->user_info.fdCreator, value, 4); |
| 146 | else |
| 147 | res = -ERANGE; |
| 148 | } else |
| 149 | res = -EOPNOTSUPP; |
| 150 | if (!res) { |
| 151 | hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, |
| 152 | sizeof(struct hfsplus_cat_file)); |
| 153 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); |
| 154 | } |
| 155 | out: |
| 156 | hfs_find_exit(&fd); |
| 157 | return res; |
| 158 | } |
| 159 | |
| 160 | ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name, |
| 161 | void *value, size_t size) |
| 162 | { |
| 163 | struct inode *inode = dentry->d_inode; |
| 164 | struct hfs_find_data fd; |
| 165 | hfsplus_cat_entry entry; |
| 166 | struct hfsplus_cat_file *file; |
| 167 | ssize_t res = 0; |
| 168 | |
| 169 | if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode)) |
| 170 | return -EOPNOTSUPP; |
| 171 | |
| 172 | if (size) { |
| 173 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); |
| 174 | if (res) |
| 175 | return res; |
| 176 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); |
| 177 | if (res) |
| 178 | goto out; |
| 179 | hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, |
| 180 | sizeof(struct hfsplus_cat_file)); |
| 181 | } |
| 182 | file = &entry.file; |
| 183 | |
| 184 | if (!strcmp(name, "hfs.type")) { |
| 185 | if (size >= 4) { |
| 186 | memcpy(value, &file->user_info.fdType, 4); |
| 187 | res = 4; |
| 188 | } else |
| 189 | res = size ? -ERANGE : 4; |
| 190 | } else if (!strcmp(name, "hfs.creator")) { |
| 191 | if (size >= 4) { |
| 192 | memcpy(value, &file->user_info.fdCreator, 4); |
| 193 | res = 4; |
| 194 | } else |
| 195 | res = size ? -ERANGE : 4; |
| 196 | } else |
| 197 | res = -EOPNOTSUPP; |
| 198 | out: |
| 199 | if (size) |
| 200 | hfs_find_exit(&fd); |
| 201 | return res; |
| 202 | } |
| 203 | |
| 204 | #define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type")) |
| 205 | |
| 206 | ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size) |
| 207 | { |
| 208 | struct inode *inode = dentry->d_inode; |
| 209 | |
| 210 | if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode)) |
| 211 | return -EOPNOTSUPP; |
| 212 | |
| 213 | if (!buffer || !size) |
| 214 | return HFSPLUS_ATTRLIST_SIZE; |
| 215 | if (size < HFSPLUS_ATTRLIST_SIZE) |
| 216 | return -ERANGE; |
| 217 | strcpy(buffer, "hfs.type"); |
| 218 | strcpy(buffer + sizeof("hfs.type"), "hfs.creator"); |
| 219 | |
| 220 | return HFSPLUS_ATTRLIST_SIZE; |
| 221 | } |