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 <linux/mount.h>
  20 #include <asm/uaccess.h>
  21 #include "hfsplus_fs.h"
  22
  23 int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
  24                   unsigned long arg)
  25 {
  26         unsigned int flags;
  27
  28         switch (cmd) {
  29         case HFSPLUS_IOC_EXT2_GETFLAGS:
  30                 flags = 0;
  31                 if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_IMMUTABLE)
  32                         flags |= FS_IMMUTABLE_FL; /* EXT2_IMMUTABLE_FL */
  33                 if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_APPEND)
  34                         flags |= FS_APPEND_FL; /* EXT2_APPEND_FL */
  35                 if (HFSPLUS_I(inode).userflags & HFSPLUS_FLG_NODUMP)
  36                         flags |= FS_NODUMP_FL; /* EXT2_NODUMP_FL */
  37                 return put_user(flags, (int __user *)arg);
  38         case HFSPLUS_IOC_EXT2_SETFLAGS: {
  39                 if (IS_RDONLY(inode) ||
  40                         (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
  41                         return -EROFS;
  42
  43                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
  44                         return -EACCES;
  45
  46                 if (get_user(flags, (int __user *)arg))
  47                         return -EFAULT;
  48
  49                 if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) ||
  50                     HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) {
  51                         if (!capable(CAP_LINUX_IMMUTABLE))
  52                                 return -EPERM;
  53                 }
  54
  55                 /* don't silently ignore unsupported ext2 flags */
  56                 if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL))
  57                         return -EOPNOTSUPP;
  58
  59                 if (flags & FS_IMMUTABLE_FL) { /* EXT2_IMMUTABLE_FL */
  60                         inode->i_flags |= S_IMMUTABLE;
  61                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
  62                 } else {
  63                         inode->i_flags &= ~S_IMMUTABLE;
  64                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  65                 }
  66                 if (flags & FS_APPEND_FL) { /* EXT2_APPEND_FL */
  67                         inode->i_flags |= S_APPEND;
  68                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_APPEND;
  69                 } else {
  70                         inode->i_flags &= ~S_APPEND;
  71                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_APPEND;
  72                 }
  73                 if (flags & FS_NODUMP_FL) /* EXT2_NODUMP_FL */
  74                         HFSPLUS_I(inode).userflags |= HFSPLUS_FLG_NODUMP;
  75                 else
  76                         HFSPLUS_I(inode).userflags &= ~HFSPLUS_FLG_NODUMP;
  77
  78                 inode->i_ctime = CURRENT_TIME_SEC;
  79                 mark_inode_dirty(inode);
  80                 return 0;
  81         }
  82         default:
  83                 return -ENOTTY;
  84         }
  85 }
  86
  87 int hfsplus_setxattr(struct dentry *dentry, const char *name,
  88                      const void *value, size_t size, int flags)
  89 {
  90         struct inode *inode = dentry->d_inode;
  91         struct hfs_find_data fd;
  92         hfsplus_cat_entry entry;
  93         struct hfsplus_cat_file *file;
  94         int res;
  95
  96         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
  97                 return -EOPNOTSUPP;
  98
  99         res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
 100         if (res)
 101                 return res;
 102         res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 103         if (res)
 104                 goto out;
 105         hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 106                         sizeof(struct hfsplus_cat_file));
 107         file = &entry.file;
 108
 109         if (!strcmp(name, "hfs.type")) {
 110                 if (size == 4)
 111                         memcpy(&file->user_info.fdType, value, 4);
 112                 else
 113                         res = -ERANGE;
 114         } else if (!strcmp(name, "hfs.creator")) {
 115                 if (size == 4)
 116                         memcpy(&file->user_info.fdCreator, value, 4);
 117                 else
 118                         res = -ERANGE;
 119         } else
 120                 res = -EOPNOTSUPP;
 121         if (!res)
 122                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 123                                 sizeof(struct hfsplus_cat_file));
 124 out:
 125         hfs_find_exit(&fd);
 126         return res;
 127 }
 128
 129 ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
 130                          void *value, size_t size)
 131 {
 132         struct inode *inode = dentry->d_inode;
 133         struct hfs_find_data fd;
 134         hfsplus_cat_entry entry;
 135         struct hfsplus_cat_file *file;
 136         ssize_t res = 0;
 137
 138         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
 139                 return -EOPNOTSUPP;
 140
 141         if (size) {
 142                 res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
 143                 if (res)
 144                         return res;
 145                 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 146                 if (res)
 147                         goto out;
 148                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 149                                 sizeof(struct hfsplus_cat_file));
 150         }
 151         file = &entry.file;
 152
 153         if (!strcmp(name, "hfs.type")) {
 154                 if (size >= 4) {
 155                         memcpy(value, &file->user_info.fdType, 4);
 156                         res = 4;
 157                 } else
 158                         res = size ? -ERANGE : 4;
 159         } else if (!strcmp(name, "hfs.creator")) {
 160                 if (size >= 4) {
 161                         memcpy(value, &file->user_info.fdCreator, 4);
 162                         res = 4;
 163                 } else
 164                         res = size ? -ERANGE : 4;
 165         } else
 166                 res = -ENODATA;
 167 out:
 168         if (size)
 169                 hfs_find_exit(&fd);
 170         return res;
 171 }
 172
 173 #define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
 174
 175 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
 176 {
 177         struct inode *inode = dentry->d_inode;
 178
 179         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
 180                 return -EOPNOTSUPP;
 181
 182         if (!buffer || !size)
 183                 return HFSPLUS_ATTRLIST_SIZE;
 184         if (size < HFSPLUS_ATTRLIST_SIZE)
 185                 return -ERANGE;
 186         strcpy(buffer, "hfs.type");
 187         strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
 188
 189         return HFSPLUS_ATTRLIST_SIZE;
 190 }