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* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* 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
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/selinux.h>
#define DEBUG_SUBSYSTEM S_LLITE
#include "../include/obd_support.h"
#include "../include/lustre_dlm.h"
#include "../include/lustre_ver.h"
#include "../include/lustre_eacl.h"
#include "llite_internal.h"
static
int get_xattr_type(const char *name)
{
if (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS))
return XATTR_ACL_ACCESS_T;
if (!strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT))
return XATTR_ACL_DEFAULT_T;
if (!strncmp(name, XATTR_USER_PREFIX,
sizeof(XATTR_USER_PREFIX) - 1))
return XATTR_USER_T;
if (!strncmp(name, XATTR_TRUSTED_PREFIX,
sizeof(XATTR_TRUSTED_PREFIX) - 1))
return XATTR_TRUSTED_T;
if (!strncmp(name, XATTR_SECURITY_PREFIX,
sizeof(XATTR_SECURITY_PREFIX) - 1))
return XATTR_SECURITY_T;
if (!strncmp(name, XATTR_LUSTRE_PREFIX,
sizeof(XATTR_LUSTRE_PREFIX) - 1))
return XATTR_LUSTRE_T;
return XATTR_OTHER_T;
}
static
int xattr_type_filter(struct ll_sb_info *sbi, int xattr_type)
{
if ((xattr_type == XATTR_ACL_ACCESS_T ||
xattr_type == XATTR_ACL_DEFAULT_T) &&
!(sbi->ll_flags & LL_SBI_ACL))
return -EOPNOTSUPP;
if (xattr_type == XATTR_USER_T && !(sbi->ll_flags & LL_SBI_USER_XATTR))
return -EOPNOTSUPP;
if (xattr_type == XATTR_TRUSTED_T && !capable(CFS_CAP_SYS_ADMIN))
return -EPERM;
if (xattr_type == XATTR_OTHER_T)
return -EOPNOTSUPP;
return 0;
}
static int
ll_xattr_set_common(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, const void *value, size_t size,
int flags)
{
char fullname[strlen(handler->prefix) + strlen(name) + 1];
struct ll_sb_info *sbi = ll_i2sbi(inode);
struct ptlrpc_request *req = NULL;
const char *pv = value;
__u64 valid;
int rc;
/* When setxattr() is called with a size of 0 the value is
* unconditionally replaced by "". When removexattr() is
* called we get a NULL value and XATTR_REPLACE for flags.
*/
if (!value && flags == XATTR_REPLACE) {
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
valid = OBD_MD_FLXATTRRM;
} else {
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);
valid = OBD_MD_FLXATTR;
}
rc = xattr_type_filter(sbi, handler->flags);
if (rc)
return rc;
if ((handler->flags == XATTR_ACL_ACCESS_T ||
handler->flags == XATTR_ACL_DEFAULT_T) &&
!inode_owner_or_capable(inode))
return -EPERM;
/* b10667: ignore lustre special xattr for now */
if ((handler->flags == XATTR_TRUSTED_T && !strcmp(name, "lov")) ||
(handler->flags == XATTR_LUSTRE_T && !strcmp(name, "lov")))
return 0;
/* b15587: ignore security.capability xattr for now */
if ((handler->flags == XATTR_SECURITY_T &&
!strcmp(name, "capability")))
return 0;
/* LU-549: Disable security.selinux when selinux is disabled */
if (handler->flags == XATTR_SECURITY_T && !selinux_is_enabled() &&
strcmp(name, "selinux") == 0)
return -EOPNOTSUPP;
sprintf(fullname, "%s%s\n", handler->prefix, name);
rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode),
valid, fullname, pv, size, 0, flags,
ll_i2suppgid(inode), &req);
if (rc) {
if (rc == -EOPNOTSUPP && handler->flags == XATTR_USER_T) {
LCONSOLE_INFO("Disabling user_xattr feature because it is not supported on the server\n");
sbi->ll_flags &= ~LL_SBI_USER_XATTR;
}
return rc;
}
ptlrpc_req_finished(req);
return 0;
}
static int ll_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, const void *value, size_t size,
int flags)
{
LASSERT(inode);
LASSERT(name);
CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), xattr %s\n",
PFID(ll_inode2fid(inode)), inode, name);
if (!strcmp(name, "lov")) {
struct lov_user_md *lump = (struct lov_user_md *)value;
int op_type = flags == XATTR_REPLACE ? LPROC_LL_REMOVEXATTR :
LPROC_LL_SETXATTR;
int rc = 0;
ll_stats_ops_tally(ll_i2sbi(inode), op_type, 1);
if (size != 0 && size < sizeof(struct lov_user_md))
return -EINVAL;
/*
* It is possible to set an xattr to a "" value of zero size.
* For this case we are going to treat it as a removal.
*/
if (!size && lump)
lump = NULL;
/* Attributes that are saved via getxattr will always have
* the stripe_offset as 0. Instead, the MDS should be
* allowed to pick the starting OST index. b=17846
*/
if (lump && lump->lmm_stripe_offset == 0)
lump->lmm_stripe_offset = -1;
if (lump && S_ISREG(inode->i_mode)) {
__u64 it_flags = FMODE_WRITE;
int lum_size;
lum_size = ll_lov_user_md_size(lump);
if (lum_size < 0 || size < lum_size)
return 0; /* b=10667: ignore error */
rc = ll_lov_setstripe_ea_info(inode, dentry, it_flags,
lump, lum_size);
/* b=10667: rc always be 0 here for now */
rc = 0;
} else if (S_ISDIR(inode->i_mode)) {
rc = ll_dir_setstripe(inode, lump, 0);
}
return rc;
} else if (!strcmp(name, "lma") || !strcmp(name, "link")) {
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);
return 0;
}
return ll_xattr_set_common(handler, dentry, inode, name, value, size,
flags);
}
int
ll_xattr_list(struct inode *inode, const char *name, int type, void *buffer,
size_t size, __u64 valid)
{
struct ll_inode_info *lli = ll_i2info(inode);
struct ll_sb_info *sbi = ll_i2sbi(inode);
struct ptlrpc_request *req = NULL;
struct mdt_body *body;
void *xdata;
int rc;
if (sbi->ll_xattr_cache_enabled && type != XATTR_ACL_ACCESS_T) {
rc = ll_xattr_cache_get(inode, name, buffer, size, valid);
if (rc == -EAGAIN)
goto getxattr_nocache;
if (rc < 0)
goto out_xattr;
/* Add "system.posix_acl_access" to the list */
if (lli->lli_posix_acl && valid & OBD_MD_FLXATTRLS) {
if (size == 0) {
rc += sizeof(XATTR_NAME_ACL_ACCESS);
} else if (size - rc >= sizeof(XATTR_NAME_ACL_ACCESS)) {
memcpy(buffer + rc, XATTR_NAME_ACL_ACCESS,
sizeof(XATTR_NAME_ACL_ACCESS));
rc += sizeof(XATTR_NAME_ACL_ACCESS);
} else {
rc = -ERANGE;
goto out_xattr;
}
}
} else {
getxattr_nocache:
rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode),
valid, name, NULL, 0, size, 0, &req);
if (rc < 0)
goto out_xattr;
body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
LASSERT(body);
/* only detect the xattr size */
if (size == 0) {
rc = body->mbo_eadatasize;
goto out;
}
if (size < body->mbo_eadatasize) {
CERROR("server bug: replied size %u > %u\n",
body->mbo_eadatasize, (int)size);
rc = -ERANGE;
goto out;
}
if (body->mbo_eadatasize == 0) {
rc = -ENODATA;
goto out;
}
/* do not need swab xattr data */
xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
body->mbo_eadatasize);
if (!xdata) {
rc = -EFAULT;
goto out;
}
memcpy(buffer, xdata, body->mbo_eadatasize);
rc = body->mbo_eadatasize;
}
out_xattr:
if (rc == -EOPNOTSUPP && type == XATTR_USER_T) {
LCONSOLE_INFO(
"%s: disabling user_xattr feature because it is not supported on the server: rc = %d\n",
ll_get_fsname(inode->i_sb, NULL, 0), rc);
sbi->ll_flags &= ~LL_SBI_USER_XATTR;
}
out:
ptlrpc_req_finished(req);
return rc;
}
static int ll_xattr_get_common(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *buffer, size_t size)
{
char fullname[strlen(handler->prefix) + strlen(name) + 1];
struct ll_sb_info *sbi = ll_i2sbi(inode);
#ifdef CONFIG_FS_POSIX_ACL
struct ll_inode_info *lli = ll_i2info(inode);
#endif
int rc;
CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
PFID(ll_inode2fid(inode)), inode);
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);
rc = xattr_type_filter(sbi, handler->flags);
if (rc)
return rc;
/* b15587: ignore security.capability xattr for now */
if ((handler->flags == XATTR_SECURITY_T && !strcmp(name, "capability")))
return -ENODATA;
/* LU-549: Disable security.selinux when selinux is disabled */
if (handler->flags == XATTR_SECURITY_T && !selinux_is_enabled() &&
!strcmp(name, "selinux"))
return -EOPNOTSUPP;
#ifdef CONFIG_FS_POSIX_ACL
/* posix acl is under protection of LOOKUP lock. when calling to this,
* we just have path resolution to the target inode, so we have great
* chance that cached ACL is uptodate.
*/
if (handler->flags == XATTR_ACL_ACCESS_T) {
struct posix_acl *acl;
spin_lock(&lli->lli_lock);
acl = posix_acl_dup(lli->lli_posix_acl);
spin_unlock(&lli->lli_lock);
if (!acl)
return -ENODATA;
rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
posix_acl_release(acl);
return rc;
}
if (handler->flags == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode))
return -ENODATA;
#endif
sprintf(fullname, "%s%s\n", handler->prefix, name);
return ll_xattr_list(inode, fullname, handler->flags, buffer, size,
OBD_MD_FLXATTR);
}
static int ll_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *buffer, size_t size)
{
LASSERT(inode);
LASSERT(name);
CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), xattr %s\n",
PFID(ll_inode2fid(inode)), inode, name);
if (!strcmp(name, "lov")) {
struct lov_stripe_md *lsm;
struct lov_user_md *lump;
struct lov_mds_md *lmm = NULL;
struct ptlrpc_request *request = NULL;
int rc = 0, lmmsize = 0;
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
return -ENODATA;
lsm = ccc_inode_lsm_get(inode);
if (!lsm) {
if (S_ISDIR(inode->i_mode)) {
rc = ll_dir_getstripe(inode, (void **)&lmm,
&lmmsize, &request, 0);
} else {
rc = -ENODATA;
}
} else {
/* LSM is present already after lookup/getattr call.
* we need to grab layout lock once it is implemented
*/
rc = obd_packmd(ll_i2dtexp(inode), &lmm, lsm);
lmmsize = rc;
}
ccc_inode_lsm_put(inode, lsm);
if (rc < 0)
goto out;
if (size == 0) {
/* used to call ll_get_max_mdsize() forward to get
* the maximum buffer size, while some apps (such as
* rsync 3.0.x) care much about the exact xattr value
* size
*/
rc = lmmsize;
goto out;
}
if (size < lmmsize) {
CERROR("server bug: replied size %d > %d for %pd (%s)\n",
lmmsize, (int)size, dentry, name);
rc = -ERANGE;
goto out;
}
lump = buffer;
memcpy(lump, lmm, lmmsize);
/* do not return layout gen for getxattr otherwise it would
* confuse tar --xattr by recognizing layout gen as stripe
* offset when the file is restored. See LU-2809.
*/
lump->lmm_layout_gen = 0;
rc = lmmsize;
out:
if (request)
ptlrpc_req_finished(request);
else if (lmm)
obd_free_diskmd(ll_i2dtexp(inode), &lmm);
return rc;
}
return ll_xattr_get_common(handler, dentry, inode, name, buffer, size);
}
ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
struct inode *inode = d_inode(dentry);
int rc = 0, rc2 = 0;
struct lov_mds_md *lmm = NULL;
struct ptlrpc_request *request = NULL;
int lmmsize;
LASSERT(inode);
CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
PFID(ll_inode2fid(inode)), inode);
ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LISTXATTR, 1);
rc = ll_xattr_list(inode, NULL, XATTR_OTHER_T, buffer, size,
OBD_MD_FLXATTRLS);
if (rc < 0)
goto out;
if (buffer) {
struct ll_sb_info *sbi = ll_i2sbi(inode);
char *xattr_name = buffer;
int xlen, rem = rc;
while (rem > 0) {
xlen = strnlen(xattr_name, rem - 1) + 1;
rem -= xlen;
if (xattr_type_filter(sbi,
get_xattr_type(xattr_name)) == 0) {
/* skip OK xattr type
* leave it in buffer
*/
xattr_name += xlen;
continue;
}
/* move up remaining xattrs in buffer
* removing the xattr that is not OK
*/
memmove(xattr_name, xattr_name + xlen, rem);
rc -= xlen;
}
}
if (S_ISREG(inode->i_mode)) {
if (!ll_i2info(inode)->lli_has_smd)
rc2 = -1;
} else if (S_ISDIR(inode->i_mode)) {
rc2 = ll_dir_getstripe(inode, (void **)&lmm, &lmmsize,
&request, 0);
}
if (rc2 < 0) {
rc2 = 0;
goto out;
} else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) {
const int prefix_len = sizeof(XATTR_LUSTRE_PREFIX) - 1;
const size_t name_len = sizeof("lov") - 1;
const size_t total_len = prefix_len + name_len + 1;
if (((rc + total_len) > size) && buffer) {
ptlrpc_req_finished(request);
return -ERANGE;
}
if (buffer) {
buffer += rc;
memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len);
memcpy(buffer + prefix_len, "lov", name_len);
buffer[prefix_len + name_len] = '\0';
}
rc2 = total_len;
}
out:
ptlrpc_req_finished(request);
rc = rc + rc2;
return rc;
}
static const struct xattr_handler ll_user_xattr_handler = {
.prefix = XATTR_USER_PREFIX,
.flags = XATTR_USER_T,
.get = ll_xattr_get_common,
.set = ll_xattr_set_common,
};
static const struct xattr_handler ll_trusted_xattr_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.flags = XATTR_TRUSTED_T,
.get = ll_xattr_get,
.set = ll_xattr_set,
};
static const struct xattr_handler ll_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.flags = XATTR_SECURITY_T,
.get = ll_xattr_get_common,
.set = ll_xattr_set_common,
};
static const struct xattr_handler ll_acl_access_xattr_handler = {
.prefix = XATTR_NAME_POSIX_ACL_ACCESS,
.flags = XATTR_ACL_ACCESS_T,
.get = ll_xattr_get_common,
.set = ll_xattr_set_common,
};
static const struct xattr_handler ll_acl_default_xattr_handler = {
.prefix = XATTR_NAME_POSIX_ACL_DEFAULT,
.flags = XATTR_ACL_DEFAULT_T,
.get = ll_xattr_get_common,
.set = ll_xattr_set_common,
};
static const struct xattr_handler ll_lustre_xattr_handler = {
.prefix = XATTR_LUSTRE_PREFIX,
.flags = XATTR_LUSTRE_T,
.get = ll_xattr_get,
.set = ll_xattr_set,
};
const struct xattr_handler *ll_xattr_handlers[] = {
&ll_user_xattr_handler,
&ll_trusted_xattr_handler,
&ll_security_xattr_handler,
#ifdef CONFIG_FS_POSIX_ACL
&ll_acl_access_xattr_handler,
&ll_acl_default_xattr_handler,
#endif
&ll_lustre_xattr_handler,
NULL,
};
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