[linux-2.6-block.git] / drivers / staging / lustre / lustre / llite / xattr.c

/*
 * 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_lite.h"
#include "../include/lustre_dlm.h"
#include "../include/lustre_ver.h"
#include "../include/lustre_eacl.h"

#include "llite_internal.h"

#define XATTR_USER_T	    (1)
#define XATTR_TRUSTED_T	 (2)
#define XATTR_SECURITY_T	(3)
#define XATTR_ACL_ACCESS_T      (4)
#define XATTR_ACL_DEFAULT_T     (5)
#define XATTR_LUSTRE_T	  (6)
#define XATTR_OTHER_T	   (7)

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_setxattr_common(struct inode *inode, const char *name,
		       const void *value, size_t size,
		       int flags, __u64 valid)
{
	struct ll_sb_info *sbi = ll_i2sbi(inode);
	struct ptlrpc_request *req = NULL;
	int xattr_type, rc;
	const char *pv = value;

	xattr_type = get_xattr_type(name);
	rc = xattr_type_filter(sbi, xattr_type);
	if (rc)
		return rc;

	if ((xattr_type == XATTR_ACL_ACCESS_T ||
	     xattr_type == XATTR_ACL_DEFAULT_T) &&
	    !inode_owner_or_capable(inode))
		return -EPERM;

	/* b10667: ignore lustre special xattr for now */
	if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) ||
	    (xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0))
		return 0;

	/* b15587: ignore security.capability xattr for now */
	if ((xattr_type == XATTR_SECURITY_T &&
	     strcmp(name, "security.capability") == 0))
		return 0;

	/* LU-549:  Disable security.selinux when selinux is disabled */
	if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
	    strcmp(name, "security.selinux") == 0)
		return -EOPNOTSUPP;

	rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode),
			 valid, name, pv, size, 0, flags,
			 ll_i2suppgid(inode), &req);
	if (rc) {
		if (rc == -EOPNOTSUPP && xattr_type == 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;
}

int ll_setxattr(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);

	ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);

	if ((strncmp(name, XATTR_TRUSTED_PREFIX,
		     sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
	     strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
	    (strncmp(name, XATTR_LUSTRE_PREFIX,
		     sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
	     strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
		struct lov_user_md *lump = (struct lov_user_md *)value;
		int rc = 0;

		if (size != 0 && size < sizeof(struct lov_user_md))
			return -EINVAL;

		/* 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 = (lump->lmm_magic == LOV_USER_MAGIC_V1) ?
				sizeof(*lump) : sizeof(struct lov_user_md_v3);

			rc = ll_lov_setstripe_ea_info(inode, dentry, it_flags,
						      lump, lum_size);
			/* b10667: 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, XATTR_NAME_LMA) == 0 ||
		   strcmp(name, XATTR_NAME_LINK) == 0)
		return 0;

	return ll_setxattr_common(inode, name, value, size, flags,
				  OBD_MD_FLXATTR);
}

int ll_removexattr(struct dentry *dentry, const char *name)
{
	struct inode *inode = d_inode(dentry);

	LASSERT(inode);
	LASSERT(name);

	CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), xattr %s\n",
	       PFID(ll_inode2fid(inode)), inode, name);

	ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
	return ll_setxattr_common(inode, name, NULL, 0, 0,
				  OBD_MD_FLXATTRRM);
}

static
int ll_getxattr_common(struct inode *inode, const char *name,
		       void *buffer, size_t size, __u64 valid)
{
	struct ll_sb_info *sbi = ll_i2sbi(inode);
	struct ptlrpc_request *req = NULL;
	struct mdt_body *body;
	int xattr_type, rc;
	void *xdata;
	struct ll_inode_info *lli = ll_i2info(inode);

	CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
	       PFID(ll_inode2fid(inode)), inode);

	/* listxattr have slightly different behavior from of ext3:
	 * without 'user_xattr' ext3 will list all xattr names but
	 * filtered out "^user..*"; we list them all for simplicity.
	 */
	if (!name) {
		xattr_type = XATTR_OTHER_T;
		goto do_getxattr;
	}

	xattr_type = get_xattr_type(name);
	rc = xattr_type_filter(sbi, xattr_type);
	if (rc)
		return rc;

	/* b15587: ignore security.capability xattr for now */
	if ((xattr_type == XATTR_SECURITY_T &&
	     strcmp(name, "security.capability") == 0))
		return -ENODATA;

	/* LU-549:  Disable security.selinux when selinux is disabled */
	if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
	    strcmp(name, "security.selinux") == 0)
		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 (xattr_type == 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 (xattr_type == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode))
		return -ENODATA;
#endif

do_getxattr:
	if (sbi->ll_xattr_cache_enabled && xattr_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->eadatasize;
			goto out;
		}

		if (size < body->eadatasize) {
			CERROR("server bug: replied size %u > %u\n",
			       body->eadatasize, (int)size);
			rc = -ERANGE;
			goto out;
		}

		if (body->eadatasize == 0) {
			rc = -ENODATA;
			goto out;
		}

		/* do not need swab xattr data */
		xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
						     body->eadatasize);
		if (!xdata) {
			rc = -EFAULT;
			goto out;
		}

		memcpy(buffer, xdata, body->eadatasize);
		rc = body->eadatasize;
	}

out_xattr:
	if (rc == -EOPNOTSUPP && xattr_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;
}

ssize_t ll_getxattr(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);

	ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);

	if ((strncmp(name, XATTR_TRUSTED_PREFIX,
		     sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
	     strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
	    (strncmp(name, XATTR_LUSTRE_PREFIX,
		     sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
	     strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
		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;

		if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
			return -ENODATA;

		if (size == 0 && S_ISDIR(inode->i_mode)) {
			/* XXX directory EA is fix for now, optimize to save
			 * RPC transfer
			 */
			rc = sizeof(struct lov_user_md);
			goto out;
		}

		lsm = ccc_inode_lsm_get(inode);
		if (!lsm) {
			if (S_ISDIR(inode->i_mode)) {
				rc = ll_dir_getstripe(inode, &lmm,
						      &lmmsize, &request);
			} 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_getxattr_common(inode, name, buffer, size, OBD_MD_FLXATTR);
}

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_getxattr_common(inode, NULL, 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, &lmm, &lmmsize, &request);
	}

	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;
}
Commit	Line	Data
d7e09d03 PT	1	/*
	2	* GPL HEADER START
	3	*
	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 only,
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License version 2 for more details (a copy is included
	14	* in the LICENSE file that accompanied this code).
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* version 2 along with this program; If not, see
6a5b99a4	18	* http://www.gnu.org/licenses/gpl-2.0.html
d7e09d03	19	*
d7e09d03 PT	20	* GPL HEADER END
	21	*/
	22	/*
	23	* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
	24	* Use is subject to license terms.
	25	*
1dc563a6	26	* Copyright (c) 2011, 2015, Intel Corporation.
d7e09d03 PT	27	*/
	28	/*
	29	* This file is part of Lustre, http://www.lustre.org/
	30	* Lustre is a trademark of Sun Microsystems, Inc.
	31	*/
	32
	33	#include <linux/fs.h>
	34	#include <linux/sched.h>
	35	#include <linux/mm.h>
	36	#include <linux/selinux.h>
	37
	38	#define DEBUG_SUBSYSTEM S_LLITE
	39
67a235f5 GKH	40	#include "../include/obd_support.h"
	41	#include "../include/lustre_lite.h"
	42	#include "../include/lustre_dlm.h"
	43	#include "../include/lustre_ver.h"
	44	#include "../include/lustre_eacl.h"
d7e09d03 PT	45
	46	#include "llite_internal.h"
	47
	48	#define XATTR_USER_T (1)
	49	#define XATTR_TRUSTED_T (2)
	50	#define XATTR_SECURITY_T (3)
	51	#define XATTR_ACL_ACCESS_T (4)
	52	#define XATTR_ACL_DEFAULT_T (5)
	53	#define XATTR_LUSTRE_T (6)
	54	#define XATTR_OTHER_T (7)
	55
	56	static
	57	int get_xattr_type(const char *name)
	58	{
97d79299	59	if (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS))
d7e09d03 PT	60	return XATTR_ACL_ACCESS_T;
d7e09d03 PT	61
97d79299	62	if (!strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT))
d7e09d03 PT	63	return XATTR_ACL_DEFAULT_T;
	64
	65	if (!strncmp(name, XATTR_USER_PREFIX,
	66	sizeof(XATTR_USER_PREFIX) - 1))
	67	return XATTR_USER_T;
	68
	69	if (!strncmp(name, XATTR_TRUSTED_PREFIX,
	70	sizeof(XATTR_TRUSTED_PREFIX) - 1))
	71	return XATTR_TRUSTED_T;
	72
	73	if (!strncmp(name, XATTR_SECURITY_PREFIX,
	74	sizeof(XATTR_SECURITY_PREFIX) - 1))
	75	return XATTR_SECURITY_T;
	76
	77	if (!strncmp(name, XATTR_LUSTRE_PREFIX,
	78	sizeof(XATTR_LUSTRE_PREFIX) - 1))
	79	return XATTR_LUSTRE_T;
	80
	81	return XATTR_OTHER_T;
	82	}
	83
	84	static
	85	int xattr_type_filter(struct ll_sb_info *sbi, int xattr_type)
	86	{
	87	if ((xattr_type == XATTR_ACL_ACCESS_T \|\|
	88	xattr_type == XATTR_ACL_DEFAULT_T) &&
	89	!(sbi->ll_flags & LL_SBI_ACL))
	90	return -EOPNOTSUPP;
	91
	92	if (xattr_type == XATTR_USER_T && !(sbi->ll_flags & LL_SBI_USER_XATTR))
	93	return -EOPNOTSUPP;
2eb90a75	94	if (xattr_type == XATTR_TRUSTED_T && !capable(CFS_CAP_SYS_ADMIN))
d7e09d03 PT	95	return -EPERM;
	96	if (xattr_type == XATTR_OTHER_T)
	97	return -EOPNOTSUPP;
	98
	99	return 0;
	100	}
	101
	102	static
	103	int ll_setxattr_common(struct inode inode, const char name,
	104	const void *value, size_t size,
	105	int flags, __u64 valid)
	106	{
	107	struct ll_sb_info *sbi = ll_i2sbi(inode);
7fc1f831	108	struct ptlrpc_request *req = NULL;
d7e09d03	109	int xattr_type, rc;
d7e09d03	110	const char *pv = value;
d7e09d03 PT	111
	112	xattr_type = get_xattr_type(name);
	113	rc = xattr_type_filter(sbi, xattr_type);
	114	if (rc)
0a3bdb00	115	return rc;
d7e09d03	116
0667dfff LX	117	if ((xattr_type == XATTR_ACL_ACCESS_T \|\|
	118	xattr_type == XATTR_ACL_DEFAULT_T) &&
	119	!inode_owner_or_capable(inode))
	120	return -EPERM;
	121
d7e09d03 PT	122	/* b10667: ignore lustre special xattr for now */
	123	if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) \|\|
	124	(xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0))
0a3bdb00	125	return 0;
d7e09d03 PT	126
	127	/* b15587: ignore security.capability xattr for now */
	128	if ((xattr_type == XATTR_SECURITY_T &&
e15ba45d	129	strcmp(name, "security.capability") == 0))
0a3bdb00	130	return 0;
d7e09d03 PT	131
	132	/* LU-549: Disable security.selinux when selinux is disabled */
	133	if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
	134	strcmp(name, "security.selinux") == 0)
0a3bdb00	135	return -EOPNOTSUPP;
d7e09d03	136
ef2e0f55	137	rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode),
a612b007 OD	138	valid, name, pv, size, 0, flags,
a612b007 OD	139	ll_i2suppgid(inode), &req);
d7e09d03 PT	140	if (rc) {
d7e09d03 PT	141	if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
2d00bd17	142	LCONSOLE_INFO("Disabling user_xattr feature because it is not supported on the server\n");
d7e09d03 PT	143	sbi->ll_flags &= ~LL_SBI_USER_XATTR;
d7e09d03 PT	144	}
0a3bdb00	145	return rc;
d7e09d03 PT	146	}
	147
	148	ptlrpc_req_finished(req);
0a3bdb00	149	return 0;
d7e09d03 PT	150	}
d7e09d03 PT	151
3767e255 AV	152	int ll_setxattr(struct dentry dentry, struct inode inode,
3767e255 AV	153	const char name, const void value, size_t size, int flags)
d7e09d03	154	{
d7e09d03 PT	155	LASSERT(inode);
	156	LASSERT(name);
	157
97a075cd JN	158	CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), xattr %s\n",
97a075cd JN	159	PFID(ll_inode2fid(inode)), inode, name);
d7e09d03 PT	160
	161	ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);
	162
	163	if ((strncmp(name, XATTR_TRUSTED_PREFIX,
	164	sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
	165	strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) \|\|
	166	(strncmp(name, XATTR_LUSTRE_PREFIX,
	167	sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
	168	strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
	169	struct lov_user_md lump = (struct lov_user_md )value;
	170	int rc = 0;
	171
87ebccf9 DC	172	if (size != 0 && size < sizeof(struct lov_user_md))
	173	return -EINVAL;
	174
d7e09d03 PT	175	/* Attributes that are saved via getxattr will always have
d7e09d03 PT	176	* the stripe_offset as 0. Instead, the MDS should be
c0894c6c OD	177	* allowed to pick the starting OST index. b=17846
c0894c6c OD	178	*/
6e16818b	179	if (lump && lump->lmm_stripe_offset == 0)
d7e09d03 PT	180	lump->lmm_stripe_offset = -1;
d7e09d03 PT	181
6e16818b	182	if (lump && S_ISREG(inode->i_mode)) {
d467220e	183	__u64 it_flags = FMODE_WRITE;
d7e09d03 PT	184	int lum_size = (lump->lmm_magic == LOV_USER_MAGIC_V1) ?
	185	sizeof(*lump) : sizeof(struct lov_user_md_v3);
	186
d467220e NY	187	rc = ll_lov_setstripe_ea_info(inode, dentry, it_flags,
d467220e NY	188	lump, lum_size);
d7e09d03 PT	189	/* b10667: rc always be 0 here for now */
	190	rc = 0;
	191	} else if (S_ISDIR(inode->i_mode)) {
	192	rc = ll_dir_setstripe(inode, lump, 0);
	193	}
	194
	195	return rc;
	196
	197	} else if (strcmp(name, XATTR_NAME_LMA) == 0 \|\|
	198	strcmp(name, XATTR_NAME_LINK) == 0)
	199	return 0;
	200
	201	return ll_setxattr_common(inode, name, value, size, flags,
	202	OBD_MD_FLXATTR);
	203	}
	204
	205	int ll_removexattr(struct dentry dentry, const char name)
	206	{
2b0143b5	207	struct inode *inode = d_inode(dentry);
d7e09d03 PT	208
	209	LASSERT(inode);
	210	LASSERT(name);
	211
97a075cd JN	212	CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), xattr %s\n",
97a075cd JN	213	PFID(ll_inode2fid(inode)), inode, name);
d7e09d03 PT	214
	215	ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
	216	return ll_setxattr_common(inode, name, NULL, 0, 0,
	217	OBD_MD_FLXATTRRM);
	218	}
	219
	220	static
	221	int ll_getxattr_common(struct inode inode, const char name,
	222	void *buffer, size_t size, __u64 valid)
	223	{
	224	struct ll_sb_info *sbi = ll_i2sbi(inode);
	225	struct ptlrpc_request *req = NULL;
	226	struct mdt_body *body;
	227	int xattr_type, rc;
	228	void *xdata;
e93a3082	229	struct ll_inode_info *lli = ll_i2info(inode);
d7e09d03	230
97a075cd JN	231	CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
97a075cd JN	232	PFID(ll_inode2fid(inode)), inode);
d7e09d03 PT	233
	234	/* listxattr have slightly different behavior from of ext3:
	235	* without 'user_xattr' ext3 will list all xattr names but
	236	* filtered out "^user..*"; we list them all for simplicity.
	237	*/
	238	if (!name) {
	239	xattr_type = XATTR_OTHER_T;
	240	goto do_getxattr;
	241	}
	242
	243	xattr_type = get_xattr_type(name);
	244	rc = xattr_type_filter(sbi, xattr_type);
	245	if (rc)
0a3bdb00	246	return rc;
d7e09d03 PT	247
	248	/* b15587: ignore security.capability xattr for now */
	249	if ((xattr_type == XATTR_SECURITY_T &&
e15ba45d	250	strcmp(name, "security.capability") == 0))
0a3bdb00	251	return -ENODATA;
d7e09d03 PT	252
	253	/* LU-549: Disable security.selinux when selinux is disabled */
	254	if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
	255	strcmp(name, "security.selinux") == 0)
0a3bdb00	256	return -EOPNOTSUPP;
d7e09d03 PT	257
d7e09d03 PT	258	#ifdef CONFIG_FS_POSIX_ACL
d7e09d03 PT	259	/* posix acl is under protection of LOOKUP lock. when calling to this,
	260	* we just have path resolution to the target inode, so we have great
	261	* chance that cached ACL is uptodate.
	262	*/
341f1f0a	263	if (xattr_type == XATTR_ACL_ACCESS_T) {
d7e09d03 PT	264	struct posix_acl *acl;
	265
	266	spin_lock(&lli->lli_lock);
	267	acl = posix_acl_dup(lli->lli_posix_acl);
	268	spin_unlock(&lli->lli_lock);
	269
	270	if (!acl)
0a3bdb00	271	return -ENODATA;
d7e09d03 PT	272
	273	rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
	274	posix_acl_release(acl);
0a3bdb00	275	return rc;
d7e09d03 PT	276	}
d7e09d03 PT	277	if (xattr_type == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode))
0a3bdb00	278	return -ENODATA;
d7e09d03 PT	279	#endif
	280
	281	do_getxattr:
e93a3082	282	if (sbi->ll_xattr_cache_enabled && xattr_type != XATTR_ACL_ACCESS_T) {
7fc1f831	283	rc = ll_xattr_cache_get(inode, name, buffer, size, valid);
e93a3082 AP	284	if (rc == -EAGAIN)
e93a3082 AP	285	goto getxattr_nocache;
7fc1f831	286	if (rc < 0)
34e1f2bb	287	goto out_xattr;
e93a3082 AP	288
e93a3082 AP	289	/* Add "system.posix_acl_access" to the list */
6e16818b	290	if (lli->lli_posix_acl && valid & OBD_MD_FLXATTRLS) {
e93a3082 AP	291	if (size == 0) {
	292	rc += sizeof(XATTR_NAME_ACL_ACCESS);
	293	} else if (size - rc >= sizeof(XATTR_NAME_ACL_ACCESS)) {
	294	memcpy(buffer + rc, XATTR_NAME_ACL_ACCESS,
	295	sizeof(XATTR_NAME_ACL_ACCESS));
	296	rc += sizeof(XATTR_NAME_ACL_ACCESS);
	297	} else {
34e1f2bb JL	298	rc = -ERANGE;
34e1f2bb JL	299	goto out_xattr;
e93a3082 AP	300	}
e93a3082 AP	301	}
7fc1f831	302	} else {
e93a3082	303	getxattr_nocache:
ef2e0f55	304	rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode),
341f1f0a	305	valid, name, NULL, 0, size, 0, &req);
7fc1f831	306	if (rc < 0)
34e1f2bb	307	goto out_xattr;
7fc1f831 AP	308
	309	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
	310	LASSERT(body);
	311
	312	/* only detect the xattr size */
34e1f2bb JL	313	if (size == 0) {
	314	rc = body->eadatasize;
	315	goto out;
	316	}
7fc1f831 AP	317
	318	if (size < body->eadatasize) {
	319	CERROR("server bug: replied size %u > %u\n",
e15ba45d	320	body->eadatasize, (int)size);
34e1f2bb JL	321	rc = -ERANGE;
34e1f2bb JL	322	goto out;
d7e09d03	323	}
d7e09d03	324
34e1f2bb JL	325	if (body->eadatasize == 0) {
	326	rc = -ENODATA;
	327	goto out;
	328	}
d7e09d03	329
7fc1f831 AP	330	/* do not need swab xattr data */
7fc1f831 AP	331	xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
e15ba45d	332	body->eadatasize);
34e1f2bb JL	333	if (!xdata) {
	334	rc = -EFAULT;
	335	goto out;
	336	}
d7e09d03	337
7fc1f831 AP	338	memcpy(buffer, xdata, body->eadatasize);
7fc1f831 AP	339	rc = body->eadatasize;
d7e09d03 PT	340	}
d7e09d03 PT	341
7fc1f831 AP	342	out_xattr:
	343	if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
	344	LCONSOLE_INFO(
	345	"%s: disabling user_xattr feature because it is not supported on the server: rc = %d\n",
	346	ll_get_fsname(inode->i_sb, NULL, 0), rc);
	347	sbi->ll_flags &= ~LL_SBI_USER_XATTR;
d7e09d03	348	}
d7e09d03 PT	349	out:
	350	ptlrpc_req_finished(req);
	351	return rc;
	352	}
	353
ce23e640 AV	354	ssize_t ll_getxattr(struct dentry dentry, struct inode inode,
ce23e640 AV	355	const char name, void buffer, size_t size)
d7e09d03	356	{
d7e09d03 PT	357	LASSERT(inode);
	358	LASSERT(name);
	359
97a075cd JN	360	CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), xattr %s\n",
97a075cd JN	361	PFID(ll_inode2fid(inode)), inode, name);
d7e09d03 PT	362
	363	ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);
	364
	365	if ((strncmp(name, XATTR_TRUSTED_PREFIX,
	366	sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
	367	strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) \|\|
	368	(strncmp(name, XATTR_LUSTRE_PREFIX,
	369	sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
	370	strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
	371	struct lov_stripe_md *lsm;
	372	struct lov_user_md *lump;
	373	struct lov_mds_md *lmm = NULL;
	374	struct ptlrpc_request *request = NULL;
	375	int rc = 0, lmmsize = 0;
	376
	377	if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
	378	return -ENODATA;
	379
	380	if (size == 0 && S_ISDIR(inode->i_mode)) {
	381	/* XXX directory EA is fix for now, optimize to save
c0894c6c OD	382	* RPC transfer
c0894c6c OD	383	*/
34e1f2bb JL	384	rc = sizeof(struct lov_user_md);
34e1f2bb JL	385	goto out;
d7e09d03 PT	386	}
	387
	388	lsm = ccc_inode_lsm_get(inode);
6e16818b	389	if (!lsm) {
d7e09d03 PT	390	if (S_ISDIR(inode->i_mode)) {
	391	rc = ll_dir_getstripe(inode, &lmm,
	392	&lmmsize, &request);
	393	} else {
	394	rc = -ENODATA;
	395	}
	396	} else {
	397	/* LSM is present already after lookup/getattr call.
c0894c6c OD	398	* we need to grab layout lock once it is implemented
c0894c6c OD	399	*/
d7e09d03 PT	400	rc = obd_packmd(ll_i2dtexp(inode), &lmm, lsm);
	401	lmmsize = rc;
	402	}
	403	ccc_inode_lsm_put(inode, lsm);
	404
	405	if (rc < 0)
34e1f2bb	406	goto out;
d7e09d03 PT	407
	408	if (size == 0) {
	409	/* used to call ll_get_max_mdsize() forward to get
	410	* the maximum buffer size, while some apps (such as
	411	* rsync 3.0.x) care much about the exact xattr value
c0894c6c OD	412	* size
c0894c6c OD	413	*/
d7e09d03	414	rc = lmmsize;
34e1f2bb	415	goto out;
d7e09d03 PT	416	}
	417
	418	if (size < lmmsize) {
09561a53 AV	419	CERROR("server bug: replied size %d > %d for %pd (%s)\n",
09561a53 AV	420	lmmsize, (int)size, dentry, name);
34e1f2bb JL	421	rc = -ERANGE;
34e1f2bb JL	422	goto out;
d7e09d03 PT	423	}
d7e09d03 PT	424
634ffdd9	425	lump = buffer;
d7e09d03 PT	426	memcpy(lump, lmm, lmmsize);
	427	/* do not return layout gen for getxattr otherwise it would
	428	* confuse tar --xattr by recognizing layout gen as stripe
c0894c6c OD	429	* offset when the file is restored. See LU-2809.
c0894c6c OD	430	*/
d7e09d03 PT	431	lump->lmm_layout_gen = 0;
	432
	433	rc = lmmsize;
	434	out:
	435	if (request)
	436	ptlrpc_req_finished(request);
	437	else if (lmm)
	438	obd_free_diskmd(ll_i2dtexp(inode), &lmm);
fbe7c6c7	439	return rc;
d7e09d03 PT	440	}
	441
	442	return ll_getxattr_common(inode, name, buffer, size, OBD_MD_FLXATTR);
	443	}
	444
	445	ssize_t ll_listxattr(struct dentry dentry, char buffer, size_t size)
	446	{
2b0143b5	447	struct inode *inode = d_inode(dentry);
d7e09d03 PT	448	int rc = 0, rc2 = 0;
	449	struct lov_mds_md *lmm = NULL;
	450	struct ptlrpc_request *request = NULL;
	451	int lmmsize;
	452
	453	LASSERT(inode);
	454
97a075cd JN	455	CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
97a075cd JN	456	PFID(ll_inode2fid(inode)), inode);
d7e09d03 PT	457
	458	ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LISTXATTR, 1);
	459
	460	rc = ll_getxattr_common(inode, NULL, buffer, size, OBD_MD_FLXATTRLS);
	461	if (rc < 0)
34e1f2bb	462	goto out;
d7e09d03	463
6e16818b	464	if (buffer) {
d7e09d03 PT	465	struct ll_sb_info *sbi = ll_i2sbi(inode);
	466	char *xattr_name = buffer;
	467	int xlen, rem = rc;
	468
	469	while (rem > 0) {
	470	xlen = strnlen(xattr_name, rem - 1) + 1;
	471	rem -= xlen;
	472	if (xattr_type_filter(sbi,
	473	get_xattr_type(xattr_name)) == 0) {
	474	/* skip OK xattr type
	475	* leave it in buffer
	476	*/
	477	xattr_name += xlen;
	478	continue;
	479	}
	480	/* move up remaining xattrs in buffer
	481	* removing the xattr that is not OK
	482	*/
	483	memmove(xattr_name, xattr_name + xlen, rem);
	484	rc -= xlen;
	485	}
	486	}
	487	if (S_ISREG(inode->i_mode)) {
	488	if (!ll_i2info(inode)->lli_has_smd)
	489	rc2 = -1;
	490	} else if (S_ISDIR(inode->i_mode)) {
	491	rc2 = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
	492	}
	493
	494	if (rc2 < 0) {
34e1f2bb JL	495	rc2 = 0;
34e1f2bb JL	496	goto out;
d7e09d03 PT	497	} else if (S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode)) {
	498	const int prefix_len = sizeof(XATTR_LUSTRE_PREFIX) - 1;
	499	const size_t name_len = sizeof("lov") - 1;
	500	const size_t total_len = prefix_len + name_len + 1;
	501
6e16818b	502	if (((rc + total_len) > size) && buffer) {
cb6a2db6 KM	503	ptlrpc_req_finished(request);
	504	return -ERANGE;
	505	}
	506
6e16818b	507	if (buffer) {
d7e09d03 PT	508	buffer += rc;
	509	memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len);
	510	memcpy(buffer + prefix_len, "lov", name_len);
	511	buffer[prefix_len + name_len] = '\0';
	512	}
	513	rc2 = total_len;
	514	}
	515	out:
	516	ptlrpc_req_finished(request);
	517	rc = rc + rc2;
	518
	519	return rc;
	520	}