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Linux/fs/ext2/xattr_user.c

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  1 /*
  2  * linux/fs/ext2/xattr_user.c
  3  * Handler for extended user attributes.
  4  *
  5  * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
  6  */
  7 
  8 #include <linux/init.h>
  9 #include <linux/string.h>
 10 #include "ext2.h"
 11 #include "xattr.h"
 12 
 13 static size_t
 14 ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
 15                 const char *name, size_t name_len, int type)
 16 {
 17         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
 18         const size_t total_len = prefix_len + name_len + 1;
 19 
 20         if (!test_opt(dentry->d_sb, XATTR_USER))
 21                 return 0;
 22 
 23         if (list && total_len <= list_size) {
 24                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
 25                 memcpy(list+prefix_len, name, name_len);
 26                 list[prefix_len + name_len] = '\0';
 27         }
 28         return total_len;
 29 }
 30 
 31 static int
 32 ext2_xattr_user_get(struct dentry *dentry, const char *name,
 33                 void *buffer, size_t size, int type)
 34 {
 35         if (strcmp(name, "") == 0)
 36                 return -EINVAL;
 37         if (!test_opt(dentry->d_sb, XATTR_USER))
 38                 return -EOPNOTSUPP;
 39         return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
 40                               name, buffer, size);
 41 }
 42 
 43 static int
 44 ext2_xattr_user_set(struct dentry *dentry, const char *name,
 45                 const void *value, size_t size, int flags, int type)
 46 {
 47         if (strcmp(name, "") == 0)
 48                 return -EINVAL;
 49         if (!test_opt(dentry->d_sb, XATTR_USER))
 50                 return -EOPNOTSUPP;
 51 
 52         return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
 53                               name, value, size, flags);
 54 }
 55 
 56 const struct xattr_handler ext2_xattr_user_handler = {
 57         .prefix = XATTR_USER_PREFIX,
 58         .list   = ext2_xattr_user_list,
 59         .get    = ext2_xattr_user_get,
 60         .set    = ext2_xattr_user_set,
 61 };
 62 

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