| Aneesh Kumar K.V | ebf4626 | 2010-05-31 13:22:56 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright IBM Corporation, 2010 |
| 3 | * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of version 2.1 of the GNU Lesser General Public License |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it would be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include "xattr.h" |
| 21 | |
| 22 | static int v9fs_xattr_user_get(struct dentry *dentry, const char *name, |
| 23 | void *buffer, size_t size, int type) |
| 24 | { |
| 25 | int retval; |
| 26 | char *full_name; |
| 27 | size_t name_len; |
| 28 | size_t prefix_len = XATTR_USER_PREFIX_LEN; |
| 29 | |
| 30 | if (name == NULL) |
| 31 | return -EINVAL; |
| 32 | |
| 33 | if (strcmp(name, "") == 0) |
| 34 | return -EINVAL; |
| 35 | |
| 36 | name_len = strlen(name); |
| 37 | full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL); |
| 38 | if (!full_name) |
| 39 | return -ENOMEM; |
| 40 | memcpy(full_name, XATTR_USER_PREFIX, prefix_len); |
| 41 | memcpy(full_name+prefix_len, name, name_len); |
| 42 | full_name[prefix_len + name_len] = '\0'; |
| 43 | |
| 44 | retval = v9fs_xattr_get(dentry, full_name, buffer, size); |
| 45 | kfree(full_name); |
| 46 | return retval; |
| 47 | } |
| 48 | |
| 49 | static int v9fs_xattr_user_set(struct dentry *dentry, const char *name, |
| 50 | const void *value, size_t size, int flags, int type) |
| 51 | { |
| 52 | int retval; |
| 53 | char *full_name; |
| 54 | size_t name_len; |
| 55 | size_t prefix_len = XATTR_USER_PREFIX_LEN; |
| 56 | |
| 57 | if (name == NULL) |
| 58 | return -EINVAL; |
| 59 | |
| 60 | if (strcmp(name, "") == 0) |
| 61 | return -EINVAL; |
| 62 | |
| 63 | name_len = strlen(name); |
| 64 | full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL); |
| 65 | if (!full_name) |
| 66 | return -ENOMEM; |
| 67 | memcpy(full_name, XATTR_USER_PREFIX, prefix_len); |
| 68 | memcpy(full_name + prefix_len, name, name_len); |
| 69 | full_name[prefix_len + name_len] = '\0'; |
| 70 | |
| 71 | retval = v9fs_xattr_set(dentry, full_name, value, size, flags); |
| 72 | kfree(full_name); |
| 73 | return retval; |
| 74 | } |
| 75 | |
| 76 | struct xattr_handler v9fs_xattr_user_handler = { |
| 77 | .prefix = XATTR_USER_PREFIX, |
| 78 | .get = v9fs_xattr_user_get, |
| 79 | .set = v9fs_xattr_user_set, |
| 80 | }; |