kernel/fs/hfs/attr.c

   1 /*
   2  *  linux/fs/hfs/attr.c
   3  *
   4  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   5  *
   6  * Export hfs data via xattr
   7  */
   8
   9
  10 #include <linux/fs.h>
  11 #include <linux/xattr.h>
  12
  13 #include "hfs_fs.h"
  14 #include "btree.h"
  15
  16 int hfs_setxattr(struct dentry *dentry, const char *name,
  17                  const void *value, size_t size, int flags)
  18 {
  19         struct inode *inode = d_inode(dentry);
  20         struct hfs_find_data fd;
  21         hfs_cat_rec rec;
  22         struct hfs_cat_file *file;
  23         int res;
  24
  25         if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
  26                 return -EOPNOTSUPP;
  27
  28         res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
  29         if (res)
  30                 return res;
  31         fd.search_key->cat = HFS_I(inode)->cat_key;
  32         res = hfs_brec_find(&fd);
  33         if (res)
  34                 goto out;
  35         hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
  36                         sizeof(struct hfs_cat_file));
  37         file = &rec.file;
  38
  39         if (!strcmp(name, "hfs.type")) {
  40                 if (size == 4)
  41                         memcpy(&file->UsrWds.fdType, value, 4);
  42                 else
  43                         res = -ERANGE;
  44         } else if (!strcmp(name, "hfs.creator")) {
  45                 if (size == 4)
  46                         memcpy(&file->UsrWds.fdCreator, value, 4);
  47                 else
  48                         res = -ERANGE;
  49         } else
  50                 res = -EOPNOTSUPP;
  51         if (!res)
  52                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
  53                                 sizeof(struct hfs_cat_file));
  54 out:
  55         hfs_find_exit(&fd);
  56         return res;
  57 }
  58
  59 ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
  60                          void *value, size_t size)
  61 {
  62         struct inode *inode = d_inode(dentry);
  63         struct hfs_find_data fd;
  64         hfs_cat_rec rec;
  65         struct hfs_cat_file *file;
  66         ssize_t res = 0;
  67
  68         if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
  69                 return -EOPNOTSUPP;
  70
  71         if (size) {
  72                 res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
  73                 if (res)
  74                         return res;
  75                 fd.search_key->cat = HFS_I(inode)->cat_key;
  76                 res = hfs_brec_find(&fd);
  77                 if (res)
  78                         goto out;
  79                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
  80                                 sizeof(struct hfs_cat_file));
  81         }
  82         file = &rec.file;
  83
  84         if (!strcmp(name, "hfs.type")) {
  85                 if (size >= 4) {
  86                         memcpy(value, &file->UsrWds.fdType, 4);
  87                         res = 4;
  88                 } else
  89                         res = size ? -ERANGE : 4;
  90         } else if (!strcmp(name, "hfs.creator")) {
  91                 if (size >= 4) {
  92                         memcpy(value, &file->UsrWds.fdCreator, 4);
  93                         res = 4;
  94                 } else
  95                         res = size ? -ERANGE : 4;
  96         } else
  97                 res = -ENODATA;
  98 out:
  99         if (size)
 100                 hfs_find_exit(&fd);
 101         return res;
 102 }
 103
 104 #define HFS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
 105
 106 ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
 107 {
 108         struct inode *inode = d_inode(dentry);
 109
 110         if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
 111                 return -EOPNOTSUPP;
 112
 113         if (!buffer || !size)
 114                 return HFS_ATTRLIST_SIZE;
 115         if (size < HFS_ATTRLIST_SIZE)
 116                 return -ERANGE;
 117         strcpy(buffer, "hfs.type");
 118         strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
 119
 120         return HFS_ATTRLIST_SIZE;
 121 }