![Steve French](/assets/img/avatar_default.png)
This first patch adds the ability for us to do a server side copy (ie fast copy offloaded to the server to perform, aka refcopy) "cp --reflink" of one file to another located on the same server. This is much faster than traditional copy (which requires reading and writing over the network and extra memcpys). This first version is not going to be copy files larger than about 1MB (to Samba) until I add support for multiple chunks and for autoconfiguring the chunksize. It includes: 1) processing of the ioctl 2) marshalling and sending the SMB2/SMB3 fsctl over the network 3) simple parsing of the response It does not include yet (these will be in followon patches to come soon): 1) support for multiple chunks 2) support for autoconfiguring and remembering the chunksize 3) Support for the older style copychunk which Samba 4.1 server supports (because this requires write permission on the target file, which cp does not give you, apparently per-posix). This may require a distinct tool (other than cp) and other ioctl to implement. Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
227 lines
6.4 KiB
C
227 lines
6.4 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 <linux/file.h>
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#include <linux/mount.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/btrfs.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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static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
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unsigned long srcfd, u64 off, u64 len, u64 destoff)
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{
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int rc;
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struct cifsFileInfo *smb_file_target = dst_file->private_data;
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struct inode *target_inode = file_inode(dst_file);
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struct cifs_tcon *target_tcon;
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struct fd src_file;
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struct cifsFileInfo *smb_file_src;
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struct inode *src_inode;
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struct cifs_tcon *src_tcon;
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cifs_dbg(FYI, "ioctl clone range\n");
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/* the destination must be opened for writing */
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if (!(dst_file->f_mode & FMODE_WRITE)) {
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cifs_dbg(FYI, "file target not open for write\n");
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return -EINVAL;
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}
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/* check if target volume is readonly and take reference */
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rc = mnt_want_write_file(dst_file);
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if (rc) {
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cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
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return rc;
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}
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src_file = fdget(srcfd);
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if (!src_file.file) {
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rc = -EBADF;
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goto out_drop_write;
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}
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if ((!src_file.file->private_data) || (!dst_file->private_data)) {
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rc = -EBADF;
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cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
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goto out_fput;
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}
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rc = -EXDEV;
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smb_file_target = dst_file->private_data;
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smb_file_src = src_file.file->private_data;
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src_tcon = tlink_tcon(smb_file_src->tlink);
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target_tcon = tlink_tcon(smb_file_target->tlink);
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/* check if source and target are on same tree connection */
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if (src_tcon != target_tcon) {
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cifs_dbg(VFS, "file copy src and target on different volume\n");
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goto out_fput;
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}
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src_inode = src_file.file->f_dentry->d_inode;
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/*
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* Note: cifs case is easier than btrfs since server responsible for
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* checks for proper open modes and file type and if it wants
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* server could even support copy of range where source = target
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*/
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/* so we do not deadlock racing two ioctls on same files */
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if (target_inode < src_inode) {
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mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_PARENT);
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mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
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} else {
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mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
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mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_CHILD);
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}
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/* determine range to clone */
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rc = -EINVAL;
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if (off + len > src_inode->i_size || off + len < off)
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goto out_unlock;
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if (len == 0)
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len = src_inode->i_size - off;
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cifs_dbg(FYI, "about to flush pages\n");
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/* should we flush first and last page first */
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truncate_inode_pages_range(&target_inode->i_data, destoff,
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PAGE_CACHE_ALIGN(destoff + len)-1);
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if (target_tcon->ses->server->ops->clone_range)
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rc = target_tcon->ses->server->ops->clone_range(xid,
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smb_file_src, smb_file_target, off, len, destoff);
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/* force revalidate of size and timestamps of target file now
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that target is updated on the server */
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CIFS_I(target_inode)->time = 0;
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out_unlock:
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/* although unlocking in the reverse order from locking is not
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strictly necessary here it is a little cleaner to be consistent */
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if (target_inode < src_inode) {
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mutex_unlock(&src_inode->i_mutex);
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mutex_unlock(&target_inode->i_mutex);
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} else {
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mutex_unlock(&target_inode->i_mutex);
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mutex_unlock(&src_inode->i_mutex);
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}
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out_fput:
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fdput(src_file);
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out_drop_write:
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mnt_drop_write_file(dst_file);
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return rc;
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}
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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 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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__u64 ExtAttrMask = 0;
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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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case BTRFS_IOC_CLONE:
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rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
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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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