312bbc5946
Server side copy is one of the most important mechanisms smb2/smb3 supports and it was unintentionally disabled for most use cases. Renaming calls to reflect the underlying smb2 ioctl called. This is similar to the name duplicate_extents used for a similar ioctl which is also used to duplicate files by reusing fs blocks. The name change is to avoid confusion. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> CC: Stable <stable@vger.kernel.org> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
290 lines
8.1 KiB
C
290 lines
8.1 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 "cifs_ioctl.h"
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#include <linux/btrfs.h>
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static int cifs_file_copychunk_range(unsigned int xid, struct file *src_file,
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struct file *dst_file)
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{
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struct inode *src_inode = file_inode(src_file);
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struct inode *target_inode = file_inode(dst_file);
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struct cifsFileInfo *smb_file_src;
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struct cifsFileInfo *smb_file_target;
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struct cifs_tcon *src_tcon;
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struct cifs_tcon *target_tcon;
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int rc;
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cifs_dbg(FYI, "ioctl copychunk range\n");
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if (!src_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;
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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->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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if (src_tcon->ses != target_tcon->ses) {
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cifs_dbg(VFS, "source and target of copy not on same server\n");
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goto out;
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}
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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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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(&target_inode->i_data, 0);
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if (target_tcon->ses->server->ops->copychunk_range)
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rc = target_tcon->ses->server->ops->copychunk_range(xid,
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smb_file_src, smb_file_target, 0, src_inode->i_size, 0);
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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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/* 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:
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return rc;
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}
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static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
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unsigned long srcfd)
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{
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int rc;
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struct fd src_file;
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struct inode *src_inode;
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cifs_dbg(FYI, "ioctl copychunk 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->f_op->unlocked_ioctl != cifs_ioctl) {
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rc = -EBADF;
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cifs_dbg(VFS, "src file seems to be from a different filesystem type\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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rc = cifs_file_copychunk_range(xid, src_file.file, dst_file);
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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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static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
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void __user *arg)
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{
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int rc = 0;
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struct smb_mnt_fs_info *fsinf;
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fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
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if (fsinf == NULL)
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return -ENOMEM;
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fsinf->version = 1;
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fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
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fsinf->device_characteristics =
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le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
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fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
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fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
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fsinf->max_path_component =
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le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
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#ifdef CONFIG_CIFS_SMB2
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fsinf->vol_serial_number = tcon->vol_serial_number;
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fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
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fsinf->share_flags = tcon->share_flags;
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fsinf->share_caps = le32_to_cpu(tcon->capabilities);
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fsinf->sector_flags = tcon->ss_flags;
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fsinf->optimal_sector_size = tcon->perf_sector_size;
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fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
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fsinf->maximal_access = tcon->maximal_access;
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#endif /* SMB2 */
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fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
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if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
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rc = -EFAULT;
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kfree(fsinf);
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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_sb = CIFS_SB(inode->i_sb);
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cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
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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_copychunk(xid, filep, arg);
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break;
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case CIFS_IOC_SET_INTEGRITY:
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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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if (tcon->ses->server->ops->set_integrity)
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rc = tcon->ses->server->ops->set_integrity(xid,
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tcon, pSMBFile);
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else
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rc = -EOPNOTSUPP;
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break;
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case CIFS_IOC_GET_MNT_INFO:
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tcon = tlink_tcon(pSMBFile->tlink);
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rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
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break;
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case CIFS_ENUMERATE_SNAPSHOTS:
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if (arg == 0) {
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rc = -EINVAL;
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goto cifs_ioc_exit;
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}
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tcon = tlink_tcon(pSMBFile->tlink);
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if (tcon->ses->server->ops->enum_snapshots)
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rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
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pSMBFile, (void __user *)arg);
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else
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rc = -EOPNOTSUPP;
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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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cifs_ioc_exit:
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free_xid(xid);
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return rc;
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}
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