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Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +05301/*
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#include <linux/module.h>
16#include <linux/fs.h>
17#include <linux/sched.h>
18#include <net/9p/9p.h>
19#include <net/9p/client.h>
20
21#include "fid.h"
22#include "xattr.h"
23
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053024ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
25 void *buffer, size_t buffer_size)
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053026{
27 ssize_t retval;
28 int msize, read_count;
29 u64 offset = 0, attr_size;
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053030 struct p9_fid *attr_fid;
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053031
32 attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
33 if (IS_ERR(attr_fid)) {
34 retval = PTR_ERR(attr_fid);
Joe Perches5d385152011-11-28 10:40:46 -080035 p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
36 retval);
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053037 attr_fid = NULL;
38 goto error;
39 }
40 if (!buffer_size) {
41 /* request to get the attr_size */
42 retval = attr_size;
43 goto error;
44 }
45 if (attr_size > buffer_size) {
46 retval = -ERANGE;
47 goto error;
48 }
49 msize = attr_fid->clnt->msize;
50 while (attr_size) {
51 if (attr_size > (msize - P9_IOHDRSZ))
52 read_count = msize - P9_IOHDRSZ;
53 else
54 read_count = attr_size;
55 read_count = p9_client_read(attr_fid, ((char *)buffer)+offset,
Eric Van Hensbergen327aec02010-08-02 11:36:18 -050056 NULL, offset, read_count);
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053057 if (read_count < 0) {
58 /* error in xattr read */
59 retval = read_count;
60 goto error;
61 }
62 offset += read_count;
63 attr_size -= read_count;
64 }
65 /* Total read xattr bytes */
66 retval = offset;
67error:
68 if (attr_fid)
69 p9_client_clunk(attr_fid);
70 return retval;
71
72}
73
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053074
75/*
76 * v9fs_xattr_get()
77 *
78 * Copy an extended attribute into the buffer
79 * provided, or compute the buffer size required.
80 * Buffer is NULL to compute the size of the buffer required.
81 *
82 * Returns a negative error number on failure, or the number of bytes
83 * used / required on success.
84 */
85ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
86 void *buffer, size_t buffer_size)
87{
88 struct p9_fid *fid;
89
Joe Perches5d385152011-11-28 10:40:46 -080090 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
91 name, buffer_size);
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053092 fid = v9fs_fid_lookup(dentry);
93 if (IS_ERR(fid))
94 return PTR_ERR(fid);
95
96 return v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
97}
98
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053099/*
100 * v9fs_xattr_set()
101 *
102 * Create, replace or remove an extended attribute for this inode. Buffer
103 * is NULL to remove an existing extended attribute, and non-NULL to
104 * either replace an existing extended attribute, or create a new extended
105 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
106 * specify that an extended attribute must exist and must not exist
107 * previous to the call, respectively.
108 *
109 * Returns 0, or a negative error number on failure.
110 */
111int v9fs_xattr_set(struct dentry *dentry, const char *name,
112 const void *value, size_t value_len, int flags)
113{
Al Viro38baba92013-01-31 12:34:58 -0500114 struct p9_fid *fid = v9fs_fid_lookup(dentry);
115 if (IS_ERR(fid))
116 return PTR_ERR(fid);
117 return v9fs_fid_xattr_set(fid, name, value, value_len, flags);
118}
119
120int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
121 const void *value, size_t value_len, int flags)
122{
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530123 u64 offset = 0;
124 int retval, msize, write_count;
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530125
Joe Perches5d385152011-11-28 10:40:46 -0800126 p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
127 name, value_len, flags);
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530128
Al Viro38baba92013-01-31 12:34:58 -0500129 /* Clone it */
130 fid = p9_client_walk(fid, 0, NULL, 1);
131 if (IS_ERR(fid))
132 return PTR_ERR(fid);
133
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530134 /*
135 * On success fid points to xattr
136 */
137 retval = p9_client_xattrcreate(fid, name, value_len, flags);
138 if (retval < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800139 p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
140 retval);
Al Viro38baba92013-01-31 12:34:58 -0500141 p9_client_clunk(fid);
142 return retval;
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530143 }
Joe Perches009ca382010-11-15 03:04:51 +0000144 msize = fid->clnt->msize;
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530145 while (value_len) {
146 if (value_len > (msize - P9_IOHDRSZ))
147 write_count = msize - P9_IOHDRSZ;
148 else
149 write_count = value_len;
150 write_count = p9_client_write(fid, ((char *)value)+offset,
Eric Van Hensbergen327aec02010-08-02 11:36:18 -0500151 NULL, offset, write_count);
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530152 if (write_count < 0) {
153 /* error in xattr write */
154 retval = write_count;
Al Viro38baba92013-01-31 12:34:58 -0500155 break;
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530156 }
157 offset += write_count;
158 value_len -= write_count;
159 }
Al Viro38baba92013-01-31 12:34:58 -0500160 return p9_client_clunk(fid);
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530161}
162
163ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
164{
165 return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
166}
167
168const struct xattr_handler *v9fs_xattr_handlers[] = {
169 &v9fs_xattr_user_handler,
Jim Garlickd9a73852013-05-29 12:09:39 -0700170 &v9fs_xattr_trusted_handler,
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530171#ifdef CONFIG_9P_FS_POSIX_ACL
172 &v9fs_xattr_acl_access_handler,
173 &v9fs_xattr_acl_default_handler,
174#endif
Jim Garlickd9a73852013-05-29 12:09:39 -0700175#ifdef CONFIG_9P_FS_SECURITY
176 &v9fs_xattr_security_handler,
177#endif
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +0530178 NULL
179};