blob: c516e200ff1a2c5523ccd25481b6371322f6c735 [file] [log] [blame]
/*
* vim:noexpandtab:shiftwidth=8:tabstop=8:
*
* Copyright CEA/DAM/DIF (2011)
* contributeur : Philippe DENIEL philippe.deniel@cea.fr
* Thomas LEIBOVICI thomas.leibovici@cea.fr
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* ---------------------------------------
*/
/**
* \file 9p_xattrcreate.c
* \brief 9P version
*
* 9p_xattrcreate.c : _9P_interpretor, request XATTRCREATE
*
*
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/xattr.h>
#include "nfs_core.h"
#include "nfs_exports.h"
#include "log.h"
#include "fsal.h"
#include "9p.h"
int _9p_xattrcreate(struct _9p_request_data *req9p, u32 *plenout, char *preply)
{
char *cursor = req9p->_9pmsg + _9P_HDR_SIZE + _9P_TYPE_SIZE;
int create;
u16 *msgtag = NULL;
u32 *fid = NULL;
u64 *size;
u32 *flag;
u16 *name_len;
char *name_str;
struct _9p_fid *pfid = NULL;
fsal_status_t fsal_status;
char name[MAXNAMLEN+1];
/* Get data */
_9p_getptr(cursor, msgtag, u16);
_9p_getptr(cursor, fid, u32);
_9p_getstr(cursor, name_len, name_str);
_9p_getptr(cursor, size, u64);
_9p_getptr(cursor, flag, u32);
LogDebug(COMPONENT_9P,
"TXATTRCREATE: tag=%u fid=%u name=%.*s size=%llu flag=%u",
(u32) *msgtag, *fid, *name_len, name_str,
(unsigned long long)*size, *flag);
if (*fid >= _9P_FID_PER_CONN)
return _9p_rerror(req9p, msgtag, ERANGE, plenout, preply);
pfid = req9p->pconn->fids[*fid];
/* Check that it is a valid fid */
if (pfid == NULL || pfid->pentry == NULL) {
LogDebug(COMPONENT_9P, "request on invalid fid=%u", *fid);
return _9p_rerror(req9p, msgtag, EIO, plenout, preply);
}
/* set op_ctx, it will be useful if FSAL is later called */
_9p_init_opctx(pfid, req9p);
if ((op_ctx->export_perms->options &
EXPORT_OPTION_WRITE_ACCESS) == 0)
return _9p_rerror(req9p, msgtag, EROFS, plenout, preply);
if (*name_len >= sizeof(name)) {
LogDebug(COMPONENT_9P, "request with name too long (%u)",
*name_len);
return _9p_rerror(req9p, msgtag, ENAMETOOLONG, plenout,
preply);
}
snprintf(name, sizeof(name), "%.*s", *name_len, name_str);
if (*size == 0LL) {
/* Size == 0 : this is in fact a call to removexattr */
LogDebug(COMPONENT_9P,
"TXATTRCREATE: tag=%u fid=%u : will remove xattr %s",
(u32) *msgtag, *fid, name);
fsal_status =
pfid->pentry->obj_ops.remove_extattr_by_name(pfid->pentry,
name);
if (FSAL_IS_ERROR(fsal_status))
return _9p_rerror(req9p, msgtag,
_9p_tools_errno(fsal_status), plenout,
preply);
} else if (!strncmp(name, "system.posix_acl_access", MAXNAMLEN)) {
/* /!\ POSIX_ACL RELATED HOOK
* Setting a POSIX ACL (using setfacl for example) means
* settings a xattr named system.posix_acl_access BUT this
* attribute is to be used and should not be created
* (it exists already since acl feature is on) */
fsal_status.major = ERR_FSAL_NO_ERROR;
fsal_status.minor = 0;
/* Create the xattr at the FSAL level and cache result */
pfid->specdata.xattr.xattr_content =
gsh_malloc(XATTR_BUFFERSIZE);
/* Special Value */
pfid->specdata.xattr.xattr_id = ACL_ACCESS_XATTR_ID;
} else {
/* Size != 0 , this is a creation/replacement of xattr */
/* Create the xattr at the FSAL level and cache result */
pfid->specdata.xattr.xattr_content =
gsh_malloc(XATTR_BUFFERSIZE);
/* try to create if flag doesn't have REPLACE bit */
if ((*flag & XATTR_REPLACE) == 0)
create = true;
else
create = false;
fsal_status =
pfid->pentry->obj_ops.setextattr_value(pfid->pentry, name,
pfid->specdata.xattr.xattr_content,
*size, create);
/* Try again with create = false if flag was set to 0
* and create failed because attribute already exists */
if (FSAL_IS_ERROR(fsal_status)
&& fsal_status.major == ERR_FSAL_EXIST && (*flag == 0)) {
fsal_status =
pfid->pentry->obj_ops.setextattr_value(pfid->pentry,
name,
pfid->specdata.xattr.xattr_content,
*size, false);
}
if (FSAL_IS_ERROR(fsal_status))
return _9p_rerror(req9p, msgtag,
_9p_tools_errno(fsal_status), plenout,
preply);
fsal_status =
pfid->pentry->obj_ops.getextattr_id_by_name(pfid->pentry,
name,
&pfid->specdata.xattr.xattr_id);
if (FSAL_IS_ERROR(fsal_status))
return _9p_rerror(req9p, msgtag,
_9p_tools_errno(fsal_status), plenout,
preply);
}
/* Remember the size of the xattr to be written,
* in order to check at TCLUNK */
pfid->specdata.xattr.xattr_size = *size;
pfid->specdata.xattr.xattr_offset = 0LL;
/* Build the reply */
_9p_setinitptr(cursor, preply, _9P_RXATTRCREATE);
_9p_setptr(cursor, msgtag, u16);
_9p_setendptr(cursor, preply);
_9p_checkbound(cursor, preply, plenout);
LogDebug(COMPONENT_9P,
"RXATTRCREATE: tag=%u fid=%u name=%.*s size=%llu flag=%u",
(u32) *msgtag, *fid, *name_len, name_str,
(unsigned long long)*size, *flag);
return 1;
} /* _9p_xattrcreate */