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a9ae008f40
Use xattr handlers for resolving attribute names. The amount of setup code required on cifs is nontrivial, so use the same get and set functions for all handlers, with switch statements for the different types of attributes in them. The set_EA handler can handle NULL values, so we don't need a separate removexattr function anymore. Remove the cifs_dbg statements related to xattr name resolution; they don't add much. Don't build xattr.o when CONFIG_CIFS_XATTR is not defined. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
333 lines
8.3 KiB
C
333 lines
8.3 KiB
C
/*
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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_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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enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
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static int cifs_xattr_set(const struct xattr_handler *handler,
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struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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int rc = -EOPNOTSUPP;
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unsigned int xid;
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struct super_block *sb = dentry->d_sb;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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char *full_path;
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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(dentry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto out;
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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 (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 out;
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}
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switch (handler->flags) {
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case XATTR_USER:
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto out;
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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, name, value, (__u16)size,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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break;
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case XATTR_CIFS_ACL: {
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#ifdef CONFIG_CIFS_ACL
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struct cifs_ntsd *pacl;
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if (!value)
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goto out;
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pacl = kmalloc(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, value, size);
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if (value &&
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pTcon->ses->server->ops->set_acl)
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rc = pTcon->ses->server->ops->set_acl(pacl,
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size, d_inode(dentry),
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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(d_inode(dentry))->time = 0;
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kfree(pacl);
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}
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#endif /* CONFIG_CIFS_ACL */
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break;
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}
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case XATTR_ACL_ACCESS:
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#ifdef CONFIG_CIFS_POSIX
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if (!value)
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goto out;
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
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value, (const int)size,
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ACL_TYPE_ACCESS, cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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#endif /* CONFIG_CIFS_POSIX */
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break;
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case XATTR_ACL_DEFAULT:
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#ifdef CONFIG_CIFS_POSIX
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if (!value)
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goto out;
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if (sb->s_flags & MS_POSIXACL)
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rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
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value, (const int)size,
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ACL_TYPE_DEFAULT, cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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#endif /* CONFIG_CIFS_POSIX */
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break;
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}
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out:
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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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return rc;
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}
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static int cifs_xattr_get(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *name, void *value, size_t size)
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{
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ssize_t rc = -EOPNOTSUPP;
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unsigned int xid;
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struct super_block *sb = dentry->d_sb;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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char *full_path;
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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(dentry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto out;
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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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switch (handler->flags) {
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case XATTR_USER:
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
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goto out;
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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, name, value, size,
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cifs_sb->local_nls, cifs_remap(cifs_sb));
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break;
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case XATTR_CIFS_ACL: {
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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 out; /* rc already EOPNOTSUPP */
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pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
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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 (value) {
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if (acllen > size)
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acllen = -ERANGE;
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else
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memcpy(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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#endif /* CONFIG_CIFS_ACL */
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break;
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}
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case XATTR_ACL_ACCESS:
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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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value, size, ACL_TYPE_ACCESS,
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cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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#endif /* CONFIG_CIFS_POSIX */
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break;
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case XATTR_ACL_DEFAULT:
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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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value, size, ACL_TYPE_DEFAULT,
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cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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#endif /* CONFIG_CIFS_POSIX */
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break;
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}
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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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out:
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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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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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unsigned int xid;
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struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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char *full_path;
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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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return rc;
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}
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static const struct xattr_handler cifs_user_xattr_handler = {
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.prefix = XATTR_USER_PREFIX,
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.flags = XATTR_USER,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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/* os2.* attributes are treated like user.* attributes */
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static const struct xattr_handler cifs_os2_xattr_handler = {
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.prefix = XATTR_OS2_PREFIX,
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.flags = XATTR_USER,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
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.name = CIFS_XATTR_CIFS_ACL,
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.flags = XATTR_CIFS_ACL,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
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.name = XATTR_NAME_POSIX_ACL_ACCESS,
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.flags = XATTR_ACL_ACCESS,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
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.name = XATTR_NAME_POSIX_ACL_DEFAULT,
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.flags = XATTR_ACL_DEFAULT,
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.get = cifs_xattr_get,
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.set = cifs_xattr_set,
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};
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const struct xattr_handler *cifs_xattr_handlers[] = {
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&cifs_user_xattr_handler,
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&cifs_os2_xattr_handler,
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&cifs_cifs_acl_xattr_handler,
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&cifs_posix_acl_access_xattr_handler,
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&cifs_posix_acl_default_xattr_handler,
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NULL
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};
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