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