151 lines
4 KiB
C
151 lines
4 KiB
C
/*
|
|
* Copyright IBM Corporation, 2010
|
|
* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of version 2.1 of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/uio.h>
|
|
#include <net/9p/9p.h>
|
|
#include <net/9p/client.h>
|
|
|
|
#include "fid.h"
|
|
#include "xattr.h"
|
|
|
|
ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
|
|
void *buffer, size_t buffer_size)
|
|
{
|
|
ssize_t retval;
|
|
u64 attr_size;
|
|
struct p9_fid *attr_fid;
|
|
struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
|
|
struct iov_iter to;
|
|
int err;
|
|
|
|
iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buffer_size);
|
|
|
|
attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
|
|
if (IS_ERR(attr_fid)) {
|
|
retval = PTR_ERR(attr_fid);
|
|
p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
|
|
retval);
|
|
return retval;
|
|
}
|
|
if (attr_size > buffer_size) {
|
|
if (!buffer_size) /* request to get the attr_size */
|
|
retval = attr_size;
|
|
else
|
|
retval = -ERANGE;
|
|
} else {
|
|
iov_iter_truncate(&to, attr_size);
|
|
retval = p9_client_read(attr_fid, 0, &to, &err);
|
|
if (err)
|
|
retval = err;
|
|
}
|
|
p9_client_clunk(attr_fid);
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* v9fs_xattr_get()
|
|
*
|
|
* Copy an extended attribute into the buffer
|
|
* provided, or compute the buffer size required.
|
|
* Buffer is NULL to compute the size of the buffer required.
|
|
*
|
|
* Returns a negative error number on failure, or the number of bytes
|
|
* used / required on success.
|
|
*/
|
|
ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
|
|
void *buffer, size_t buffer_size)
|
|
{
|
|
struct p9_fid *fid;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
|
|
name, buffer_size);
|
|
fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
return v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
|
|
}
|
|
|
|
/*
|
|
* v9fs_xattr_set()
|
|
*
|
|
* Create, replace or remove an extended attribute for this inode. Buffer
|
|
* is NULL to remove an existing extended attribute, and non-NULL to
|
|
* either replace an existing extended attribute, or create a new extended
|
|
* attribute. The flags XATTR_REPLACE and XATTR_CREATE
|
|
* specify that an extended attribute must exist and must not exist
|
|
* previous to the call, respectively.
|
|
*
|
|
* Returns 0, or a negative error number on failure.
|
|
*/
|
|
int v9fs_xattr_set(struct dentry *dentry, const char *name,
|
|
const void *value, size_t value_len, int flags)
|
|
{
|
|
struct p9_fid *fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
return v9fs_fid_xattr_set(fid, name, value, value_len, flags);
|
|
}
|
|
|
|
int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
|
|
const void *value, size_t value_len, int flags)
|
|
{
|
|
struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
|
|
struct iov_iter from;
|
|
int retval;
|
|
|
|
iov_iter_kvec(&from, WRITE | ITER_KVEC, &kvec, 1, value_len);
|
|
|
|
p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
|
|
name, value_len, flags);
|
|
|
|
/* Clone it */
|
|
fid = p9_client_walk(fid, 0, NULL, 1);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
/*
|
|
* On success fid points to xattr
|
|
*/
|
|
retval = p9_client_xattrcreate(fid, name, value_len, flags);
|
|
if (retval < 0)
|
|
p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
|
|
retval);
|
|
else
|
|
p9_client_write(fid, 0, &from, &retval);
|
|
p9_client_clunk(fid);
|
|
return retval;
|
|
}
|
|
|
|
ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
|
|
{
|
|
return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
|
|
}
|
|
|
|
const struct xattr_handler *v9fs_xattr_handlers[] = {
|
|
&v9fs_xattr_user_handler,
|
|
&v9fs_xattr_trusted_handler,
|
|
#ifdef CONFIG_9P_FS_POSIX_ACL
|
|
&v9fs_xattr_acl_access_handler,
|
|
&v9fs_xattr_acl_default_handler,
|
|
#endif
|
|
#ifdef CONFIG_9P_FS_SECURITY
|
|
&v9fs_xattr_security_handler,
|
|
#endif
|
|
NULL
|
|
};
|