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| 1 | /* |
| 2 | * linux/fs/ext3/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/module.h> |
| 9 | #include <linux/string.h> |
| 10 | #include <linux/fs.h> |
| 11 | #include <linux/ext3_jbd.h> |
| 12 | #include <linux/ext3_fs.h> |
| 13 | #include "xattr.h" |
| 14 | |
| 15 | static size_t |
| 16 | ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size, |
| 17 | const char *name, size_t name_len, int type) |
| 18 | { |
| 19 | const size_t prefix_len = XATTR_USER_PREFIX_LEN; |
| 20 | const size_t total_len = prefix_len + name_len + 1; |
| 21 | |
| 22 | if (!test_opt(dentry->d_sb, XATTR_USER)) |
| 23 | return 0; |
| 24 | |
| 25 | if (list && total_len <= list_size) { |
| 26 | memcpy(list, XATTR_USER_PREFIX, prefix_len); |
| 27 | memcpy(list+prefix_len, name, name_len); |
| 28 | list[prefix_len + name_len] = '\0'; |
| 29 | } |
| 30 | return total_len; |
| 31 | } |
| 32 | |
| 33 | static int |
| 34 | ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer, |
| 35 | size_t size, int type) |
| 36 | { |
| 37 | if (strcmp(name, "") == 0) |
| 38 | return -EINVAL; |
| 39 | if (!test_opt(dentry->d_sb, XATTR_USER)) |
| 40 | return -EOPNOTSUPP; |
| 41 | return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_USER, |
| 42 | name, buffer, size); |
| 43 | } |
| 44 | |
| 45 | static int |
| 46 | ext3_xattr_user_set(struct dentry *dentry, const char *name, |
| 47 | const void *value, size_t size, int flags, int type) |
| 48 | { |
| 49 | if (strcmp(name, "") == 0) |
| 50 | return -EINVAL; |
| 51 | if (!test_opt(dentry->d_sb, XATTR_USER)) |
| 52 | return -EOPNOTSUPP; |
| 53 | return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_USER, |
| 54 | name, value, size, flags); |
| 55 | } |
| 56 | |
| 57 | const struct xattr_handler ext3_xattr_user_handler = { |
| 58 | .prefix = XATTR_USER_PREFIX, |
| 59 | .list = ext3_xattr_user_list, |
| 60 | .get = ext3_xattr_user_get, |
| 61 | .set = ext3_xattr_user_set, |
| 62 | }; |
| 63 |
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