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64a5cfa6db
Allow cifs/smb2/smb3 to return whether or not a file is compressed
via lsattr, and allow SMB2/SMB3 to set the per-file compression
flag ("chattr +c filename" on an smb3 mount).
Windows users often set the compressed flag (it can be
done from the desktop and file manager). David Disseldorp
has patches to Samba server to support this (at least on btrfs)
which are complementary to this
Signed-off-by: Steve French <smfrench@gmail.com>
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/*
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* fs/cifs/ioctl.c
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*
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* vfs operations that deal with io control
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*
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* Copyright (C) International Business Machines Corp., 2005,2013
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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 "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 "cifsfs.h"
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long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
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{
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struct inode *inode = file_inode(filep);
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int rc = -ENOTTY; /* strange error - but the precedent */
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unsigned int xid;
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struct cifs_sb_info *cifs_sb;
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struct cifsFileInfo *pSMBFile = filep->private_data;
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struct cifs_tcon *tcon;
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__u64 ExtAttrBits = 0;
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__u64 ExtAttrMask = 0;
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__u64 caps;
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xid = get_xid();
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cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
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cifs_sb = CIFS_SB(inode->i_sb);
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switch (command) {
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case FS_IOC_GETFLAGS:
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if (pSMBFile == NULL)
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break;
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tcon = tlink_tcon(pSMBFile->tlink);
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caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
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#ifdef CONFIG_CIFS_POSIX
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if (CIFS_UNIX_EXTATTR_CAP & caps) {
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rc = CIFSGetExtAttr(xid, tcon,
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pSMBFile->fid.netfid,
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&ExtAttrBits, &ExtAttrMask);
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if (rc == 0)
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rc = put_user(ExtAttrBits &
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FS_FL_USER_VISIBLE,
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(int __user *)arg);
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if (rc != EOPNOTSUPP)
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break;
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}
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#endif /* CONFIG_CIFS_POSIX */
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rc = 0;
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if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
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/* add in the compressed bit */
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ExtAttrBits = FS_COMPR_FL;
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rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
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(int __user *)arg);
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}
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break;
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case FS_IOC_SETFLAGS:
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if (pSMBFile == NULL)
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break;
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tcon = tlink_tcon(pSMBFile->tlink);
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caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
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if (get_user(ExtAttrBits, (int __user *)arg)) {
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rc = -EFAULT;
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break;
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}
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/*
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* if (CIFS_UNIX_EXTATTR_CAP & caps)
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* rc = CIFSSetExtAttr(xid, tcon,
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* pSMBFile->fid.netfid,
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* extAttrBits,
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* &ExtAttrMask);
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* if (rc != EOPNOTSUPP)
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* break;
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*/
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/* Currently only flag we can set is compressed flag */
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if ((ExtAttrBits & FS_COMPR_FL) == 0)
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break;
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/* Try to set compress flag */
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if (tcon->ses->server->ops->set_compression) {
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rc = tcon->ses->server->ops->set_compression(
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xid, tcon, pSMBFile);
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cifs_dbg(FYI, "set compress flag rc %d\n", rc);
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}
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break;
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default:
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cifs_dbg(FYI, "unsupported ioctl\n");
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break;
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}
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free_xid(xid);
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return rc;
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}
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