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 |= EXT2_FLAG_IMMUTABLE; /* EXT2_IMMUTABLE_FL */
  33                 if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_APPEND)
  34                         flags |= EXT2_FLAG_APPEND; /* EXT2_APPEND_FL */
  35                 if (HFSPLUS_I(inode).userflags & HFSPLUS_FLG_NODUMP)
  36                         flags |= EXT2_FLAG_NODUMP; /* 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 & (EXT2_FLAG_IMMUTABLE|EXT2_FLAG_APPEND) ||
  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 & ~(EXT2_FLAG_IMMUTABLE|EXT2_FLAG_APPEND|
  57                               EXT2_FLAG_NODUMP))
  58                         return -EOPNOTSUPP;
  59
  60                 if (flags & EXT2_FLAG_IMMUTABLE) { /* EXT2_IMMUTABLE_FL */
  61                         inode->i_flags |= S_IMMUTABLE;
  62                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
  63                 } else {
  64                         inode->i_flags &= ~S_IMMUTABLE;
  65                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  66                 }
  67                 if (flags & EXT2_FLAG_APPEND) { /* EXT2_APPEND_FL */
  68                         inode->i_flags |= S_APPEND;
  69                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_APPEND;
  70                 } else {
  71                         inode->i_flags &= ~S_APPEND;
  72                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_APPEND;
  73                 }
  74                 if (flags & EXT2_FLAG_NODUMP) /* EXT2_NODUMP_FL */
  75                         HFSPLUS_I(inode).userflags |= HFSPLUS_FLG_NODUMP;
  76                 else
  77                         HFSPLUS_I(inode).userflags &= ~HFSPLUS_FLG_NODUMP;
  78
  79                 inode->i_ctime = CURRENT_TIME_SEC;
  80                 mark_inode_dirty(inode);
  81                 return 0;
  82         }
  83         default:
  84                 return -ENOTTY;
  85         }
  86 }
  87
  88 int hfsplus_setxattr(struct dentry *dentry, const char *name,
  89                      const void *value, size_t size, int flags)
  90 {
  91         struct inode *inode = dentry->d_inode;
  92         struct hfs_find_data fd;
  93         hfsplus_cat_entry entry;
  94         struct hfsplus_cat_file *file;
  95         int res;
  96
  97         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
  98                 return -EOPNOTSUPP;
  99
 100         res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
 101         if (res)
 102                 return res;
 103         res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 104         if (res)
 105                 goto out;
 106         hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 107                         sizeof(struct hfsplus_cat_file));
 108         file = &entry.file;
 109
 110         if (!strcmp(name, "hfs.type")) {
 111                 if (size == 4)
 112                         memcpy(&file->user_info.fdType, value, 4);
 113                 else
 114                         res = -ERANGE;
 115         } else if (!strcmp(name, "hfs.creator")) {
 116                 if (size == 4)
 117                         memcpy(&file->user_info.fdCreator, value, 4);
 118                 else
 119                         res = -ERANGE;
 120         } else
 121                 res = -EOPNOTSUPP;
 122         if (!res)
 123                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 124                                 sizeof(struct hfsplus_cat_file));
 125 out:
 126         hfs_find_exit(&fd);
 127         return res;
 128 }
 129
 130 ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
 131                          void *value, size_t size)
 132 {
 133         struct inode *inode = dentry->d_inode;
 134         struct hfs_find_data fd;
 135         hfsplus_cat_entry entry;
 136         struct hfsplus_cat_file *file;
 137         ssize_t res = 0;
 138
 139         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
 140                 return -EOPNOTSUPP;
 141
 142         if (size) {
 143                 res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
 144                 if (res)
 145                         return res;
 146                 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 147                 if (res)
 148                         goto out;
 149                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 150                                 sizeof(struct hfsplus_cat_file));
 151         }
 152         file = &entry.file;
 153
 154         if (!strcmp(name, "hfs.type")) {
 155                 if (size >= 4) {
 156                         memcpy(value, &file->user_info.fdType, 4);
 157                         res = 4;
 158                 } else
 159                         res = size ? -ERANGE : 4;
 160         } else if (!strcmp(name, "hfs.creator")) {
 161                 if (size >= 4) {
 162                         memcpy(value, &file->user_info.fdCreator, 4);
 163                         res = 4;
 164                 } else
 165                         res = size ? -ERANGE : 4;
 166         } else
 167                 res = -ENODATA;
 168 out:
 169         if (size)
 170                 hfs_find_exit(&fd);
 171         return res;
 172 }
 173
 174 #define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
 175
 176 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
 177 {
 178         struct inode *inode = dentry->d_inode;
 179
 180         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
 181                 return -EOPNOTSUPP;
 182
 183         if (!buffer || !size)
 184                 return HFSPLUS_ATTRLIST_SIZE;
 185         if (size < HFSPLUS_ATTRLIST_SIZE)
 186                 return -ERANGE;
 187         strcpy(buffer, "hfs.type");
 188         strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
 189
 190         return HFSPLUS_ATTRLIST_SIZE;
 191 }