linux/fs/hfs/attr.c
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   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
  16int hfs_setxattr(struct dentry *dentry, const char *name,
  17                 const void *value, size_t size, int flags)
  18{
  19        struct inode *inode = dentry->d_inode;
  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));
  54out:
  55        hfs_find_exit(&fd);
  56        return res;
  57}
  58
  59ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
  60                         void *value, size_t size)
  61{
  62        struct inode *inode = dentry->d_inode;
  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;
  98out:
  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
 106ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
 107{
 108        struct inode *inode = dentry->d_inode;
 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}
 122
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