02b1666544
Getting fantastic copy performance with cp --reflink over SMB3.11
using the new FSCTL_DUPLICATE_EXTENTS.
This FSCTL was added in the SMB3.11 dialect (testing was
against REFS file system) so have put it as a 3.11 protocol
specific operation ("vers=3.1.1" on the mount). Tested at
the SMB3 plugfest in Redmond.
It depends on the new FS Attribute (BLOCK_REFCOUNTING) which
is used to advertise support for the ability to do this ioctl
(if you can support multiple files pointing to the same block
than this refcounting ability or equivalent is needed to
support the new reflink-like duplicate extent SMB3 ioctl.
Signed-off-by: Steve French <steve.french@primarydata.com>
228 lines
6.5 KiB
C
228 lines
6.5 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 "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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#include <linux/btrfs.h>
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#define CIFS_IOCTL_MAGIC 0xCF
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#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
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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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bool dup_extents)
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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 = file_inode(src_file.file);
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rc = -EINVAL;
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if (S_ISDIR(src_inode->i_mode))
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goto out_fput;
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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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lock_two_nondirectories(target_inode, src_inode);
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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 (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
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rc = target_tcon->ses->server->ops->duplicate_extents(xid,
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smb_file_src, smb_file_target, off, len, destoff);
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else if (!dup_extents && 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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else
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rc = -EOPNOTSUPP;
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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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unlock_two_nondirectories(src_inode, target_inode);
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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 CIFS_IOC_COPYCHUNK_FILE:
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rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
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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, true);
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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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