fs/hfsplus/ioctl.c

   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/sched.h>
  18 #include <linux/xattr.h>
  19 #include <asm/uaccess.h>
  20 #include "hfsplus_fs.h"
  21
  22 int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
  23                   unsigned long arg)
  24 {
  25         unsigned int flags;
  26
  27         switch (cmd) {
  28         case HFSPLUS_IOC_EXT2_GETFLAGS:
  29                 flags = 0;
  30                 if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_IMMUTABLE)
  31                         flags |= FS_IMMUTABLE_FL; /* EXT2_IMMUTABLE_FL */
  32                 if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_APPEND)
  33                         flags |= FS_APPEND_FL; /* EXT2_APPEND_FL */
  34                 if (HFSPLUS_I(inode).userflags & HFSPLUS_FLG_NODUMP)
  35                         flags |= FS_NODUMP_FL; /* EXT2_NODUMP_FL */
  36                 return put_user(flags, (int __user *)arg);
  37         case HFSPLUS_IOC_EXT2_SETFLAGS: {
  38                 if (IS_RDONLY(inode))
  39                         return -EROFS;
  40
  41                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
  42                         return -EACCES;
  43
  44                 if (get_user(flags, (int __user *)arg))
  45                         return -EFAULT;
  46
  47                 if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) ||
  48                     HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) {
  49                         if (!capable(CAP_LINUX_IMMUTABLE))
  50                                 return -EPERM;
  51                 }
  52
  53                 /* don't silently ignore unsupported ext2 flags */
  54                 if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL))
  55                         return -EOPNOTSUPP;
  56
  57                 if (flags & FS_IMMUTABLE_FL) { /* EXT2_IMMUTABLE_FL */
  58                         inode->i_flags |= S_IMMUTABLE;
  59                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
  60                 } else {
  61                         inode->i_flags &= ~S_IMMUTABLE;
  62                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  63                 }
  64                 if (flags & FS_APPEND_FL) { /* EXT2_APPEND_FL */
  65                         inode->i_flags |= S_APPEND;
  66                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_APPEND;
  67                 } else {
  68                         inode->i_flags &= ~S_APPEND;
  69                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_APPEND;
  70                 }
  71                 if (flags & FS_NODUMP_FL) /* EXT2_NODUMP_FL */
  72                         HFSPLUS_I(inode).userflags |= HFSPLUS_FLG_NODUMP;
  73                 else
  74                         HFSPLUS_I(inode).userflags &= ~HFSPLUS_FLG_NODUMP;
  75
  76                 inode->i_ctime = CURRENT_TIME_SEC;
  77                 mark_inode_dirty(inode);
  78                 return 0;
  79         }
  80         default:
  81                 return -ENOTTY;
  82         }
  83 }
  84
  85 int hfsplus_setxattr(struct dentry *dentry, const char *name,
  86                      const void *value, size_t size, int flags)
  87 {
  88         struct inode *inode = dentry->d_inode;
  89         struct hfs_find_data fd;
  90         hfsplus_cat_entry entry;
  91         struct hfsplus_cat_file *file;
  92         int res;
  93
  94         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
  95                 return -EOPNOTSUPP;
  96
  97         res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
  98         if (res)
  99                 return res;
 100         res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 101         if (res)
 102                 goto out;
 103         hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 104                         sizeof(struct hfsplus_cat_file));
 105         file = &entry.file;
 106
 107         if (!strcmp(name, "hfs.type")) {
 108                 if (size == 4)
 109                         memcpy(&file->user_info.fdType, value, 4);
 110                 else
 111                         res = -ERANGE;
 112         } else if (!strcmp(name, "hfs.creator")) {
 113                 if (size == 4)
 114                         memcpy(&file->user_info.fdCreator, value, 4);
 115                 else
 116                         res = -ERANGE;
 117         } else
 118                 res = -EOPNOTSUPP;
 119         if (!res)
 120                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 121                                 sizeof(struct hfsplus_cat_file));
 122 out:
 123         hfs_find_exit(&fd);
 124         return res;
 125 }
 126
 127 ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
 128                          void *value, size_t size)
 129 {
 130         struct inode *inode = dentry->d_inode;
 131         struct hfs_find_data fd;
 132         hfsplus_cat_entry entry;
 133         struct hfsplus_cat_file *file;
 134         ssize_t res = 0;
 135
 136         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
 137                 return -EOPNOTSUPP;
 138
 139         if (size) {
 140                 res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
 141                 if (res)
 142                         return res;
 143                 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 144                 if (res)
 145                         goto out;
 146                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 147                                 sizeof(struct hfsplus_cat_file));
 148         }
 149         file = &entry.file;
 150
 151         if (!strcmp(name, "hfs.type")) {
 152                 if (size >= 4) {
 153                         memcpy(value, &file->user_info.fdType, 4);
 154                         res = 4;
 155                 } else
 156                         res = size ? -ERANGE : 4;
 157         } else if (!strcmp(name, "hfs.creator")) {
 158                 if (size >= 4) {
 159                         memcpy(value, &file->user_info.fdCreator, 4);
 160                         res = 4;
 161                 } else
 162                         res = size ? -ERANGE : 4;
 163         } else
 164                 res = -ENODATA;
 165 out:
 166         if (size)
 167                 hfs_find_exit(&fd);
 168         return res;
 169 }
 170
 171 #define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
 172
 173 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
 174 {
 175         struct inode *inode = dentry->d_inode;
 176
 177         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
 178                 return -EOPNOTSUPP;
 179
 180         if (!buffer || !size)
 181                 return HFSPLUS_ATTRLIST_SIZE;
 182         if (size < HFSPLUS_ATTRLIST_SIZE)
 183                 return -ERANGE;
 184         strcpy(buffer, "hfs.type");
 185         strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
 186
 187         return HFSPLUS_ATTRLIST_SIZE;
 188 }