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![Linus Torvalds](/assets/img/avatar_default.png)
This is a pure automated search-and-replace of the internal kernel superblock flags. The s_flags are now called SB_*, with the names and the values for the moment mirroring the MS_* flags that they're equivalent to. Note how the MS_xyz flags are the ones passed to the mount system call, while the SB_xyz flags are what we then use in sb->s_flags. The script to do this was: # places to look in; re security/*: it generally should *not* be # touched (that stuff parses mount(2) arguments directly), but # there are two places where we really deal with superblock flags. FILES="drivers/mtd drivers/staging/lustre fs ipc mm \ include/linux/fs.h include/uapi/linux/bfs_fs.h \ security/apparmor/apparmorfs.c security/apparmor/include/lib.h" # the list of MS_... constants SYMS="RDONLY NOSUID NODEV NOEXEC SYNCHRONOUS REMOUNT MANDLOCK \ DIRSYNC NOATIME NODIRATIME BIND MOVE REC VERBOSE SILENT \ POSIXACL UNBINDABLE PRIVATE SLAVE SHARED RELATIME KERNMOUNT \ I_VERSION STRICTATIME LAZYTIME SUBMOUNT NOREMOTELOCK NOSEC BORN \ ACTIVE NOUSER" SED_PROG= for i in $SYMS; do SED_PROG="$SED_PROG -e s/MS_$i/SB_$i/g"; done # we want files that contain at least one of MS_..., # with fs/namespace.c and fs/pnode.c excluded. L=$(for i in $SYMS; do git grep -w -l MS_$i $FILES; done| sort|uniq|grep -v '^fs/namespace.c'|grep -v '^fs/pnode.c') for f in $L; do sed -i $f $SED_PROG; done Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
387 lines
9.5 KiB
C
387 lines
9.5 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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#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
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#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
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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, struct inode *inode,
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const char *name, const void *value,
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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_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, 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(inode)->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 & SB_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 & SB_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_attrib_get(struct dentry *dentry,
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struct inode *inode, void *value,
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size_t size)
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{
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ssize_t rc;
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__u32 *pattribute;
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rc = cifs_revalidate_dentry_attr(dentry);
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if (rc)
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return rc;
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if ((value == NULL) || (size == 0))
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return sizeof(__u32);
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else if (size < sizeof(__u32))
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return -ERANGE;
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/* return dos attributes as pseudo xattr */
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pattribute = (__u32 *)value;
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*pattribute = CIFS_I(inode)->cifsAttrs;
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return sizeof(__u32);
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}
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static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
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void *value, size_t size)
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{
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ssize_t rc;
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__u64 * pcreatetime;
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rc = cifs_revalidate_dentry_attr(dentry);
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if (rc)
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return rc;
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if ((value == NULL) || (size == 0))
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return sizeof(__u64);
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else if (size < sizeof(__u64))
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return -ERANGE;
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/* return dos attributes as pseudo xattr */
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pcreatetime = (__u64 *)value;
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*pcreatetime = CIFS_I(inode)->createtime;
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return sizeof(__u64);
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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 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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cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
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if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
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rc = cifs_attrib_get(dentry, inode, value, size);
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break;
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} else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
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rc = cifs_creation_time_get(dentry, inode, value, size);
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break;
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}
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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, 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 & SB_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 & SB_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, 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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