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424 lines
12 KiB
424 lines
12 KiB
/*
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* fs/cifs/xattr.c
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*
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* Copyright (c) International Business Machines Corp., 2003, 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "cifs_unicode.h"
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#define MAX_EA_VALUE_SIZE 65535
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#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
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#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
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/* BB need to add server (Samba e.g) support for security and trusted prefix */
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int cifs_removexattr(struct dentry *direntry, const char *ea_name)
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{
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int rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path = NULL;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto remove_ea_exit;
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}
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if (ea_name == NULL) {
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cifs_dbg(FYI, "Null xattr names not supported\n");
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} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
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&& (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
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cifs_dbg(FYI,
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"illegal xattr request %s (only user namespace supported)\n",
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ea_name);
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/* BB what if no namespace prefix? */
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/* Should we just pass them to server, except for
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system and perhaps security prefixes? */
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} else {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto remove_ea_exit;
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ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
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if (pTcon->ses->server->ops->set_EA)
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rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
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full_path, ea_name, NULL, (__u16)0,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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}
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remove_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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int cifs_setxattr(struct dentry *direntry, const char *ea_name,
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const void *ea_value, size_t value_size, int flags)
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{
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int rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto set_ea_exit;
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}
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/* return dos attributes as pseudo xattr */
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/* return alt name if available as pseudo attr */
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/* if proc/fs/cifs/streamstoxattr is set then
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search server for EAs or streams to
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returns as xattrs */
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if (value_size > MAX_EA_VALUE_SIZE) {
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cifs_dbg(FYI, "size of EA value too large\n");
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rc = -EOPNOTSUPP;
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goto set_ea_exit;
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}
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if (ea_name == NULL) {
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cifs_dbg(FYI, "Null xattr names not supported\n");
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} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
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== 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto set_ea_exit;
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if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
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cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
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ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
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if (pTcon->ses->server->ops->set_EA)
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rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
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full_path, ea_name, ea_value, (__u16)value_size,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
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== 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto set_ea_exit;
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ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
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if (pTcon->ses->server->ops->set_EA)
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rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
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full_path, ea_name, ea_value, (__u16)value_size,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
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strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
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#ifdef CONFIG_CIFS_ACL
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struct cifs_ntsd *pacl;
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pacl = kmalloc(value_size, GFP_KERNEL);
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if (!pacl) {
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rc = -ENOMEM;
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} else {
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memcpy(pacl, ea_value, value_size);
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if (pTcon->ses->server->ops->set_acl)
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rc = pTcon->ses->server->ops->set_acl(pacl,
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value_size, direntry->d_inode,
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full_path, CIFS_ACL_DACL);
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else
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rc = -EOPNOTSUPP;
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if (rc == 0) /* force revalidate of the inode */
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CIFS_I(direntry->d_inode)->time = 0;
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kfree(pacl);
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}
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#else
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cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
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#endif /* CONFIG_CIFS_ACL */
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} else {
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int temp;
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temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
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strlen(POSIX_ACL_XATTR_ACCESS));
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if (temp == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
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ea_value, (const int)value_size,
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ACL_TYPE_ACCESS, cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
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#else
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cifs_dbg(FYI, "set POSIX ACL not supported\n");
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#endif
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} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
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strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
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ea_value, (const int)value_size,
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ACL_TYPE_DEFAULT, cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
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#else
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cifs_dbg(FYI, "set default POSIX ACL not supported\n");
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#endif
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} else {
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cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
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ea_name);
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/* BB what if no namespace prefix? */
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/* Should we just pass them to server, except for
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system and perhaps security prefixes? */
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}
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}
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set_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
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void *ea_value, size_t buf_size)
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{
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ssize_t rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto get_ea_exit;
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}
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/* return dos attributes as pseudo xattr */
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/* return alt name if available as pseudo attr */
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if (ea_name == NULL) {
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cifs_dbg(FYI, "Null xattr names not supported\n");
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} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
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== 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto get_ea_exit;
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if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
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cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
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/* revalidate/getattr then populate from inode */
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} /* BB add else when above is implemented */
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ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
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if (pTcon->ses->server->ops->query_all_EAs)
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rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
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full_path, ea_name, ea_value, buf_size,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto get_ea_exit;
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ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
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if (pTcon->ses->server->ops->query_all_EAs)
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rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
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full_path, ea_name, ea_value, buf_size,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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} else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
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strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
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ea_value, buf_size, ACL_TYPE_ACCESS,
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cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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#else
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cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
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#endif /* CONFIG_CIFS_POSIX */
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} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
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strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
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#ifdef CONFIG_CIFS_POSIX
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
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ea_value, buf_size, ACL_TYPE_DEFAULT,
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cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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#else
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cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
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#endif /* CONFIG_CIFS_POSIX */
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} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
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strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
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#ifdef CONFIG_CIFS_ACL
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u32 acllen;
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struct cifs_ntsd *pacl;
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if (pTcon->ses->server->ops->get_acl == NULL)
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goto get_ea_exit; /* rc already EOPNOTSUPP */
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pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
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direntry->d_inode, full_path, &acllen);
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if (IS_ERR(pacl)) {
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rc = PTR_ERR(pacl);
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cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
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__func__, rc);
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} else {
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if (ea_value) {
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if (acllen > buf_size)
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acllen = -ERANGE;
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else
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memcpy(ea_value, pacl, acllen);
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}
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rc = acllen;
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kfree(pacl);
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}
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#else
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cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
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#endif /* CONFIG_CIFS_ACL */
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} else if (strncmp(ea_name,
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XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
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cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
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} else if (strncmp(ea_name,
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XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
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cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
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} else
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cifs_dbg(FYI,
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"illegal xattr request %s (only user namespace supported)\n",
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ea_name);
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/* We could add an additional check for streams ie
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if proc/fs/cifs/streamstoxattr is set then
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search server for EAs or streams to
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returns as xattrs */
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if (rc == -EINVAL)
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rc = -EOPNOTSUPP;
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get_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
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{
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ssize_t rc = -EOPNOTSUPP;
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#ifdef CONFIG_CIFS_XATTR
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct super_block *sb;
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char *full_path;
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if (direntry == NULL)
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return -EIO;
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if (direntry->d_inode == NULL)
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return -EIO;
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sb = direntry->d_inode->i_sb;
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if (sb == NULL)
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return -EIO;
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cifs_sb = CIFS_SB(sb);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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return -EOPNOTSUPP;
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = get_xid();
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto list_ea_exit;
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}
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/* return dos attributes as pseudo xattr */
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/* return alt name if available as pseudo attr */
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/* if proc/fs/cifs/streamstoxattr is set then
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search server for EAs or streams to
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returns as xattrs */
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if (pTcon->ses->server->ops->query_all_EAs)
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rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
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full_path, NULL, data, buf_size,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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list_ea_exit:
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kfree(full_path);
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free_xid(xid);
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cifs_put_tlink(tlink);
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#endif
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return rc;
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}
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