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