[PATCHv2] Add reflink copy over SMB3.11 with new FSCTL_DUPLICATE_EXTENTS
diff mbox

Message ID 1435544465-14133-1-git-send-email-steve.french@primarydata.com
State New
Headers show

Commit Message

Steve French June 29, 2015, 2:21 a.m. UTC
Update the patch to correct target file size.

 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>
---
 fs/cifs/cifsglob.h |  3 +++
 fs/cifs/cifspdu.h  |  2 ++
 fs/cifs/ioctl.c    | 16 +++++++++++++---
 fs/cifs/smb2ops.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 fs/cifs/smb2pdu.h  |  8 ++++++++
 fs/cifs/smbfsctl.h |  1 +
 6 files changed, 75 insertions(+), 3 deletions(-)

Comments

Darrick J. Wong June 29, 2015, 5:27 p.m. UTC | #1
On Sun, Jun 28, 2015 at 09:21:05PM -0500, Steve French wrote:
>  Update the patch to correct target file size.
> 
>  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>
> ---
>  fs/cifs/cifsglob.h |  3 +++
>  fs/cifs/cifspdu.h  |  2 ++
>  fs/cifs/ioctl.c    | 16 +++++++++++++---
>  fs/cifs/smb2ops.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
>  fs/cifs/smb2pdu.h  |  8 ++++++++
>  fs/cifs/smbfsctl.h |  1 +
>  6 files changed, 75 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> index a0212ec..81194e6 100644
> --- a/fs/cifs/cifsglob.h
> +++ b/fs/cifs/cifsglob.h
> @@ -390,6 +390,9 @@ struct smb_version_operations {
>  	int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
>  			struct cifsFileInfo *target_file, u64 src_off, u64 len,
>  			u64 dest_off);
> +	int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
> +			struct cifsFileInfo *target_file, u64 src_off, u64 len,
> +			u64 dest_off);
>  	int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
>  	ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
>  			const unsigned char *, const unsigned char *, char *,
> diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
> index 998a66f..47b030d 100644
> --- a/fs/cifs/cifspdu.h
> +++ b/fs/cifs/cifspdu.h
> @@ -2255,6 +2255,8 @@ typedef struct {
>  
>  
>  /* List of FileSystemAttributes - see 2.5.1 of MS-FSCC */
> +#define FILE_SUPPORTS_SPARSE_VDL	0x10000000 /* faster nonsparse extend */
> +#define FILE_SUPPORTS_BLOCK_REFCOUNTING	0x08000000 /* allow ioctl dup extents */
>  #define FILE_SUPPORT_INTEGRITY_STREAMS	0x04000000
>  #define FILE_SUPPORTS_USN_JOURNAL	0x02000000
>  #define FILE_SUPPORTS_OPEN_BY_FILE_ID	0x01000000
> diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
> index 8b7898b..7843b19 100644
> --- a/fs/cifs/ioctl.c
> +++ b/fs/cifs/ioctl.c
> @@ -31,12 +31,14 @@
>  #include "cifsproto.h"
>  #include "cifs_debug.h"
>  #include "cifsfs.h"
> +#include <linux/btrfs.h>
>  
>  #define CIFS_IOCTL_MAGIC	0xCF
>  #define CIFS_IOC_COPYCHUNK_FILE	_IOW(CIFS_IOCTL_MAGIC, 3, int)
>  
>  static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
> -			unsigned long srcfd, u64 off, u64 len, u64 destoff)
> +			unsigned long srcfd, u64 off, u64 len, u64 destoff,
> +			bool dup_extents)
>  {
>  	int rc;
>  	struct cifsFileInfo *smb_file_target = dst_file->private_data;
> @@ -109,9 +111,14 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
>  	truncate_inode_pages_range(&target_inode->i_data, destoff,
>  				   PAGE_CACHE_ALIGN(destoff + len)-1);
>  
> -	if (target_tcon->ses->server->ops->clone_range)
> +	if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
> +		rc = target_tcon->ses->server->ops->duplicate_extents(xid,
> +			smb_file_src, smb_file_target, off, len, destoff);
> +	else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
>  		rc = target_tcon->ses->server->ops->clone_range(xid,
>  			smb_file_src, smb_file_target, off, len, destoff);
> +	else
> +		rc = -EOPNOTSUPP;
>  
>  	/* force revalidate of size and timestamps of target file now
>  	   that target is updated on the server */
> @@ -205,7 +212,10 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
>  			}
>  			break;
>  		case CIFS_IOC_COPYCHUNK_FILE:
> -			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
> +			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
> +			break;
> +		case BTRFS_IOC_CLONE:
> +			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);

Any interest in supporting BTRFS_IOC_CLONE_RANGE or BTRFS_IOC_EXTENT_SAME?
It looks like you could easily support the former, and the latter would
enable things like duperemove.  I've been working on a pile of xfstests to
exercise these three ioctls, will post them later today, I hope.

--D

>  			break;
>  		default:
>  			cifs_dbg(FYI, "unsupported ioctl\n");
> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
> index c7d228c..b1e9c0f 100644
> --- a/fs/cifs/smb2ops.c
> +++ b/fs/cifs/smb2ops.c
> @@ -806,6 +806,53 @@ smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
>  			    cfile->fid.volatile_fid, cfile->pid, &eof, false);
>  }
>  
> +#ifdef CONFIG_CIFS_SMB311
> +static int
> +smb2_duplicate_extents(const unsigned int xid,
> +			struct cifsFileInfo *srcfile,
> +			struct cifsFileInfo *trgtfile, u64 src_off,
> +			u64 len, u64 dest_off)
> +{
> +	int rc;
> +	unsigned int ret_data_len;
> +	char *retbuf = NULL;
> +	struct duplicate_extents_to_file dup_ext_buf;
> +	struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
> +
> +	/* server fileays advertise duplicate extent support with this flag */
> +	if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
> +	     FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
> +		return -EOPNOTSUPP;
> +
> +	dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
> +	dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
> +	dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
> +	dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
> +	dup_ext_buf.ByteCount = cpu_to_le64(len);
> +	cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
> +		src_off, dest_off, len);
> +
> +	rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
> +	if (rc)
> +		goto duplicate_extents_out;
> +
> +	rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
> +			trgtfile->fid.volatile_fid,
> +			FSCTL_DUPLICATE_EXTENTS_TO_FILE,
> +			true /* is_fsctl */, (char *)&dup_ext_buf,
> +			sizeof(struct duplicate_extents_to_file),
> +			(char **)&retbuf,
> +			&ret_data_len);
> +
> +	if (ret_data_len > 0)
> +		cifs_dbg(FYI, "non-zero response length in duplicate extents");
> +
> +duplicate_extents_out:
> +	return rc;
> +}
> +#endif /* CONFIG_CIFS_SMB311 */
> +
> +
>  static int
>  smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
>  		   struct cifsFileInfo *cfile)
> @@ -1714,6 +1761,7 @@ struct smb_version_operations smb311_operations = {
>  	.create_lease_buf = smb3_create_lease_buf,
>  	.parse_lease_buf = smb3_parse_lease_buf,
>  	.clone_range = smb2_clone_range,
> +	.duplicate_extents = smb2_duplicate_extents,
>  /*	.validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
>  	.wp_retry_size = smb2_wp_retry_size,
>  	.dir_needs_close = smb2_dir_needs_close,
> diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
> index 725283a..8e7bbe5 100644
> --- a/fs/cifs/smb2pdu.h
> +++ b/fs/cifs/smb2pdu.h
> @@ -654,6 +654,14 @@ struct compress_ioctl {
>  	__le16 CompressionState; /* See cifspdu.h for possible flag values */
>  } __packed;
>  
> +struct duplicate_extents_to_file {
> +	__u64 PersistentFileHandle; /* source file handle, opaque endianness */
> +	__u64 VolatileFileHandle;
> +	__le64 SourceFileOffset;
> +	__le64 TargetFileOffset;
> +	__le64 ByteCount;  /* Bytes to be copied */
> +} __packed;
> +
>  struct smb2_ioctl_req {
>  	struct smb2_hdr hdr;
>  	__le16 StructureSize;	/* Must be 57 */
> diff --git a/fs/cifs/smbfsctl.h b/fs/cifs/smbfsctl.h
> index 83efa59..d098da6 100644
> --- a/fs/cifs/smbfsctl.h
> +++ b/fs/cifs/smbfsctl.h
> @@ -78,6 +78,7 @@
>  #define FSCTL_QUERY_ALLOCATED_RANGES 0x000940CF /* BB add struct */
>  #define FSCTL_SET_DEFECT_MANAGEMENT  0x00098134 /* BB add struct */
>  #define FSCTL_FILE_LEVEL_TRIM        0x00098208 /* BB add struct */
> +#define FSCTL_DUPLICATE_EXTENTS_TO_FILE 0x00098344
>  #define FSCTL_SIS_LINK_FILES         0x0009C104
>  #define FSCTL_PIPE_PEEK              0x0011400C /* BB add struct */
>  #define FSCTL_PIPE_TRANSCEIVE        0x0011C017 /* BB add struct */
> -- 
> 2.1.4
> 
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Steven French June 29, 2015, 7:33 p.m. UTC | #2
On Mon, Jun 29, 2015 at 12:27 PM, Darrick J. Wong
<darrick.wong@oracle.com> wrote:
>
> On Sun, Jun 28, 2015 at 09:21:05PM -0500, Steve French wrote:
> >  Update the patch to correct target file size.
> >
> >  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>
> > ---
> >  fs/cifs/cifsglob.h |  3 +++
> >  fs/cifs/cifspdu.h  |  2 ++
> >  fs/cifs/ioctl.c    | 16 +++++++++++++---
> >  fs/cifs/smb2ops.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> >  fs/cifs/smb2pdu.h  |  8 ++++++++
> >  fs/cifs/smbfsctl.h |  1 +
> >  6 files changed, 75 insertions(+), 3 deletions(-)
> >
> > diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> > index a0212ec..81194e6 100644
> > --- a/fs/cifs/cifsglob.h
> > +++ b/fs/cifs/cifsglob.h
> > @@ -390,6 +390,9 @@ struct smb_version_operations {
> >       int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
> >                       struct cifsFileInfo *target_file, u64 src_off, u64 len,
> >                       u64 dest_off);
> > +     int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
> > +                     struct cifsFileInfo *target_file, u64 src_off, u64 len,
> > +                     u64 dest_off);
> >       int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
> >       ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
> >                       const unsigned char *, const unsigned char *, char *,
> > diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
> > index 998a66f..47b030d 100644
> > --- a/fs/cifs/cifspdu.h
> > +++ b/fs/cifs/cifspdu.h
> > @@ -2255,6 +2255,8 @@ typedef struct {
> >
> >
> >  /* List of FileSystemAttributes - see 2.5.1 of MS-FSCC */
> > +#define FILE_SUPPORTS_SPARSE_VDL     0x10000000 /* faster nonsparse extend */
> > +#define FILE_SUPPORTS_BLOCK_REFCOUNTING      0x08000000 /* allow ioctl dup extents */
> >  #define FILE_SUPPORT_INTEGRITY_STREAMS       0x04000000
> >  #define FILE_SUPPORTS_USN_JOURNAL    0x02000000
> >  #define FILE_SUPPORTS_OPEN_BY_FILE_ID        0x01000000
> > diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
> > index 8b7898b..7843b19 100644
> > --- a/fs/cifs/ioctl.c
> > +++ b/fs/cifs/ioctl.c
> > @@ -31,12 +31,14 @@
> >  #include "cifsproto.h"
> >  #include "cifs_debug.h"
> >  #include "cifsfs.h"
> > +#include <linux/btrfs.h>
> >
> >  #define CIFS_IOCTL_MAGIC     0xCF
> >  #define CIFS_IOC_COPYCHUNK_FILE      _IOW(CIFS_IOCTL_MAGIC, 3, int)
> >
> >  static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
> > -                     unsigned long srcfd, u64 off, u64 len, u64 destoff)
> > +                     unsigned long srcfd, u64 off, u64 len, u64 destoff,
> > +                     bool dup_extents)
> >  {
> >       int rc;
> >       struct cifsFileInfo *smb_file_target = dst_file->private_data;
> > @@ -109,9 +111,14 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
> >       truncate_inode_pages_range(&target_inode->i_data, destoff,
> >                                  PAGE_CACHE_ALIGN(destoff + len)-1);
> >
> > -     if (target_tcon->ses->server->ops->clone_range)
> > +     if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
> > +             rc = target_tcon->ses->server->ops->duplicate_extents(xid,
> > +                     smb_file_src, smb_file_target, off, len, destoff);
> > +     else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
> >               rc = target_tcon->ses->server->ops->clone_range(xid,
> >                       smb_file_src, smb_file_target, off, len, destoff);
> > +     else
> > +             rc = -EOPNOTSUPP;
> >
> >       /* force revalidate of size and timestamps of target file now
> >          that target is updated on the server */
> > @@ -205,7 +212,10 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
> >                       }
> >                       break;
> >               case CIFS_IOC_COPYCHUNK_FILE:
> > -                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
> > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
> > +                     break;
> > +             case BTRFS_IOC_CLONE:
> > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
>
> Any interest in supporting BTRFS_IOC_CLONE_RANGE or BTRFS_IOC_EXTENT_SAME?
> It looks like you could easily support the former, and the latter would
> enable things like duperemove.  I've been working on a pile of xfstests to
> exercise these three ioctls, will post them later today, I hope.
>
> --D
>

So far Samba (server) only uses three btrfs ioctls, but that includes
clone range:

./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_CLONE_RANGE ...
./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_DESTROY ...
./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_CREATE_V2 ...

But btrfs clone range is only (optionally if present) used to handle
the "CopyChunk" API (SMB3 and CIFS network protocol requests), and
Samba server doesn't have code for the FSCTL_DUPLICATE_EXTENTS fsctl
(SMB3 network protocol request) yet.  It looks trivial to map that to
BTRFS_IOC_CLONE_RANGE in the Samba server.   Would need to add trivial
parsing in smbd/smb2_ioctl_network_fs.c and a new VFS entry point in
the Samba VFS and a small helper routine in
source3/modules/vfs_btrfs.c
Steven French June 29, 2015, 7:41 p.m. UTC | #3
On Mon, Jun 29, 2015 at 2:33 PM, Steve French
<steve.french@primarydata.com> wrote:
> On Mon, Jun 29, 2015 at 12:27 PM, Darrick J. Wong
> <darrick.wong@oracle.com> wrote:
>>
>> On Sun, Jun 28, 2015 at 09:21:05PM -0500, Steve French wrote:
>> >  Update the patch to correct target file size.
>> >
>> >  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>
>> > ---
>> >  fs/cifs/cifsglob.h |  3 +++
>> >  fs/cifs/cifspdu.h  |  2 ++
>> >  fs/cifs/ioctl.c    | 16 +++++++++++++---
>> >  fs/cifs/smb2ops.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
>> >  fs/cifs/smb2pdu.h  |  8 ++++++++
>> >  fs/cifs/smbfsctl.h |  1 +
>> >  6 files changed, 75 insertions(+), 3 deletions(-)
>> >
>> > diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
>> > index a0212ec..81194e6 100644
>> > --- a/fs/cifs/cifsglob.h
>> > +++ b/fs/cifs/cifsglob.h
>> > @@ -390,6 +390,9 @@ struct smb_version_operations {
>> >       int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
>> >                       struct cifsFileInfo *target_file, u64 src_off, u64 len,
>> >                       u64 dest_off);
>> > +     int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
>> > +                     struct cifsFileInfo *target_file, u64 src_off, u64 len,
>> > +                     u64 dest_off);
>> >       int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
>> >       ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
>> >                       const unsigned char *, const unsigned char *, char *,
>> > diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
>> > index 998a66f..47b030d 100644
>> > --- a/fs/cifs/cifspdu.h
>> > +++ b/fs/cifs/cifspdu.h
>> > @@ -2255,6 +2255,8 @@ typedef struct {
>> >
>> >
>> >  /* List of FileSystemAttributes - see 2.5.1 of MS-FSCC */
>> > +#define FILE_SUPPORTS_SPARSE_VDL     0x10000000 /* faster nonsparse extend */
>> > +#define FILE_SUPPORTS_BLOCK_REFCOUNTING      0x08000000 /* allow ioctl dup extents */
>> >  #define FILE_SUPPORT_INTEGRITY_STREAMS       0x04000000
>> >  #define FILE_SUPPORTS_USN_JOURNAL    0x02000000
>> >  #define FILE_SUPPORTS_OPEN_BY_FILE_ID        0x01000000
>> > diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
>> > index 8b7898b..7843b19 100644
>> > --- a/fs/cifs/ioctl.c
>> > +++ b/fs/cifs/ioctl.c
>> > @@ -31,12 +31,14 @@
>> >  #include "cifsproto.h"
>> >  #include "cifs_debug.h"
>> >  #include "cifsfs.h"
>> > +#include <linux/btrfs.h>
>> >
>> >  #define CIFS_IOCTL_MAGIC     0xCF
>> >  #define CIFS_IOC_COPYCHUNK_FILE      _IOW(CIFS_IOCTL_MAGIC, 3, int)
>> >
>> >  static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
>> > -                     unsigned long srcfd, u64 off, u64 len, u64 destoff)
>> > +                     unsigned long srcfd, u64 off, u64 len, u64 destoff,
>> > +                     bool dup_extents)
>> >  {
>> >       int rc;
>> >       struct cifsFileInfo *smb_file_target = dst_file->private_data;
>> > @@ -109,9 +111,14 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
>> >       truncate_inode_pages_range(&target_inode->i_data, destoff,
>> >                                  PAGE_CACHE_ALIGN(destoff + len)-1);
>> >
>> > -     if (target_tcon->ses->server->ops->clone_range)
>> > +     if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
>> > +             rc = target_tcon->ses->server->ops->duplicate_extents(xid,
>> > +                     smb_file_src, smb_file_target, off, len, destoff);
>> > +     else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
>> >               rc = target_tcon->ses->server->ops->clone_range(xid,
>> >                       smb_file_src, smb_file_target, off, len, destoff);
>> > +     else
>> > +             rc = -EOPNOTSUPP;
>> >
>> >       /* force revalidate of size and timestamps of target file now
>> >          that target is updated on the server */
>> > @@ -205,7 +212,10 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
>> >                       }
>> >                       break;
>> >               case CIFS_IOC_COPYCHUNK_FILE:
>> > -                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
>> > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
>> > +                     break;
>> > +             case BTRFS_IOC_CLONE:
>> > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
>>
>> Any interest in supporting BTRFS_IOC_CLONE_RANGE or BTRFS_IOC_EXTENT_SAME?
>> It looks like you could easily support the former, and the latter would
>> enable things like duperemove.  I've been working on a pile of xfstests to
>> exercise these three ioctls, will post them later today, I hope.
>>
>> --D
>>
>
> So far Samba (server) only uses three btrfs ioctls, but that includes
> clone range:
>
> ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_CLONE_RANGE ...
> ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_DESTROY ...
> ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_CREATE_V2 ...
>
> But btrfs clone range is only (optionally if present) used to handle
> the "CopyChunk" API (SMB3 and CIFS network protocol requests), and
> Samba server doesn't have code for the FSCTL_DUPLICATE_EXTENTS fsctl
> (SMB3 network protocol request) yet.  It looks trivial to map that to
> BTRFS_IOC_CLONE_RANGE in the Samba server.   Would need to add trivial
> parsing in smbd/smb2_ioctl_network_fs.c and a new VFS entry point in
> the Samba VFS and a small helper routine in
> source3/modules/vfs_btrfs.c

I should also mention that cifs.ko can already do fast(er) server side
copy today by using CopyChunk on SMB2/SMB3 but it is emulated in some
cases on the Samba server (e.g. when not running on btrfs or with
vfs_btrfs enabled) but "cp --reflink" semantics required that it
actually do the clone_range/duplicate_extents and Samba can't
guarantee that with CopyChunk (FSCTL_SRV_COPYCHUNK_WRITE)  - on the
other hand the new smb3 network protocol request (SMB3
FSCTL_DUPLICATE_EXTENTS) does guarantee that it is a reflink-like
copy.

We need an "smb3cp" utility (perhaps added to cifs-utils) that can try
the various types of server side copy and accept parms which allow the
user to specify the behavior they want (and the offsets they want) -
since few people know about the existing ioctl in cifs.ko which calls
CopyChunk (and FSCTL_SRV_COPYCHUNK_WRITE is not as fast as
FSCTL_DUPLICATE_EXTENTS)

I was also looking into using DUPLICATE_EXTENTS to enable the two new
fallocate features (insert range and collapse range) because it can be
called with source and target as the same file.
Darrick J. Wong June 29, 2015, 9:31 p.m. UTC | #4
On Mon, Jun 29, 2015 at 02:33:56PM -0500, Steve French wrote:
> On Mon, Jun 29, 2015 at 12:27 PM, Darrick J. Wong
> <darrick.wong@oracle.com> wrote:
> >
> > On Sun, Jun 28, 2015 at 09:21:05PM -0500, Steve French wrote:
> > >  Update the patch to correct target file size.
> > >
> > >  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>
> > > ---
> > >  fs/cifs/cifsglob.h |  3 +++
> > >  fs/cifs/cifspdu.h  |  2 ++
> > >  fs/cifs/ioctl.c    | 16 +++++++++++++---
> > >  fs/cifs/smb2ops.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> > >  fs/cifs/smb2pdu.h  |  8 ++++++++
> > >  fs/cifs/smbfsctl.h |  1 +
> > >  6 files changed, 75 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> > > index a0212ec..81194e6 100644
> > > --- a/fs/cifs/cifsglob.h
> > > +++ b/fs/cifs/cifsglob.h
> > > @@ -390,6 +390,9 @@ struct smb_version_operations {
> > >       int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
> > >                       struct cifsFileInfo *target_file, u64 src_off, u64 len,
> > >                       u64 dest_off);
> > > +     int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
> > > +                     struct cifsFileInfo *target_file, u64 src_off, u64 len,
> > > +                     u64 dest_off);
> > >       int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
> > >       ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
> > >                       const unsigned char *, const unsigned char *, char *,
> > > diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
> > > index 998a66f..47b030d 100644
> > > --- a/fs/cifs/cifspdu.h
> > > +++ b/fs/cifs/cifspdu.h
> > > @@ -2255,6 +2255,8 @@ typedef struct {
> > >
> > >
> > >  /* List of FileSystemAttributes - see 2.5.1 of MS-FSCC */
> > > +#define FILE_SUPPORTS_SPARSE_VDL     0x10000000 /* faster nonsparse extend */
> > > +#define FILE_SUPPORTS_BLOCK_REFCOUNTING      0x08000000 /* allow ioctl dup extents */
> > >  #define FILE_SUPPORT_INTEGRITY_STREAMS       0x04000000
> > >  #define FILE_SUPPORTS_USN_JOURNAL    0x02000000
> > >  #define FILE_SUPPORTS_OPEN_BY_FILE_ID        0x01000000
> > > diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
> > > index 8b7898b..7843b19 100644
> > > --- a/fs/cifs/ioctl.c
> > > +++ b/fs/cifs/ioctl.c
> > > @@ -31,12 +31,14 @@
> > >  #include "cifsproto.h"
> > >  #include "cifs_debug.h"
> > >  #include "cifsfs.h"
> > > +#include <linux/btrfs.h>
> > >
> > >  #define CIFS_IOCTL_MAGIC     0xCF
> > >  #define CIFS_IOC_COPYCHUNK_FILE      _IOW(CIFS_IOCTL_MAGIC, 3, int)
> > >
> > >  static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
> > > -                     unsigned long srcfd, u64 off, u64 len, u64 destoff)
> > > +                     unsigned long srcfd, u64 off, u64 len, u64 destoff,
> > > +                     bool dup_extents)
> > >  {
> > >       int rc;
> > >       struct cifsFileInfo *smb_file_target = dst_file->private_data;
> > > @@ -109,9 +111,14 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
> > >       truncate_inode_pages_range(&target_inode->i_data, destoff,
> > >                                  PAGE_CACHE_ALIGN(destoff + len)-1);
> > >
> > > -     if (target_tcon->ses->server->ops->clone_range)
> > > +     if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
> > > +             rc = target_tcon->ses->server->ops->duplicate_extents(xid,
> > > +                     smb_file_src, smb_file_target, off, len, destoff);
> > > +     else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
> > >               rc = target_tcon->ses->server->ops->clone_range(xid,
> > >                       smb_file_src, smb_file_target, off, len, destoff);
> > > +     else
> > > +             rc = -EOPNOTSUPP;
> > >
> > >       /* force revalidate of size and timestamps of target file now
> > >          that target is updated on the server */
> > > @@ -205,7 +212,10 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
> > >                       }
> > >                       break;
> > >               case CIFS_IOC_COPYCHUNK_FILE:
> > > -                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
> > > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
> > > +                     break;
> > > +             case BTRFS_IOC_CLONE:
> > > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
> >
> > Any interest in supporting BTRFS_IOC_CLONE_RANGE or BTRFS_IOC_EXTENT_SAME?
> > It looks like you could easily support the former, and the latter would
> > enable things like duperemove.  I've been working on a pile of xfstests to
> > exercise these three ioctls, will post them later today, I hope.
> >
> > --D
> >
> 
> So far Samba (server) only uses three btrfs ioctls, but that includes
> clone range:

Oh, my question was mostly about support for CLONE_RANGE within
cifs.ko so that clients could ask for a reflink, which would then be
sent off to the server as FSCTL_DUPLICATE_EXTENTS.  That doesn't seem
too hard, but I didn't see it in ioctl.c and wondered why. :)

> 
> ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_CLONE_RANGE ...
> ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_DESTROY ...
> ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_CREATE_V2 ...
> 
> But btrfs clone range is only (optionally if present) used to handle
> the "CopyChunk" API (SMB3 and CIFS network protocol requests), and
> Samba server doesn't have code for the FSCTL_DUPLICATE_EXTENTS fsctl
> (SMB3 network protocol request) yet.  It looks trivial to map that to
> BTRFS_IOC_CLONE_RANGE in the Samba server.   Would need to add trivial
> parsing in smbd/smb2_ioctl_network_fs.c and a new VFS entry point in
> the Samba VFS and a small helper routine in
> source3/modules/vfs_btrfs.c

Sounds fairly straightforward on the server side.  I'm working on adding
the three ioctls I mentioned (CLONE, CLONE_RANGE, EXTENT_SAME) to XFS and
others are working on it for ext4; do you think it would be difficult to
adapt Samba server to talk to these three btrfs APIs even with a non-btrfs
backend?

(Or, maybe someday we might refactor all this into a common syscall or
something.)

I guess BTRFS_IOC_EXTENT_SAME would be harder since you'd want to compare
file contents on the server, and I'm not sure if SMB can actually do that.

--D

> 
> 
> -- 
> 
> Steve French
> 
> Principal Systems Engineer: Protocols
> 
> W: 512-918-9276
> 
> C:  512-501-9669
> 
> www.primarydata.com
> --
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Steven French June 29, 2015, 9:50 p.m. UTC | #5
On Mon, Jun 29, 2015 at 4:31 PM, Darrick J. Wong
<darrick.wong@oracle.com> wrote:
>
> On Mon, Jun 29, 2015 at 02:33:56PM -0500, Steve French wrote:
> > On Mon, Jun 29, 2015 at 12:27 PM, Darrick J. Wong
> > <darrick.wong@oracle.com> wrote:
> > >
> > > On Sun, Jun 28, 2015 at 09:21:05PM -0500, Steve French wrote:
> > > >  Update the patch to correct target file size.
> > > >
> > > >  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>
> > > > ---
> > > >  fs/cifs/cifsglob.h |  3 +++
> > > >  fs/cifs/cifspdu.h  |  2 ++
> > > >  fs/cifs/ioctl.c    | 16 +++++++++++++---
> > > >  fs/cifs/smb2ops.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> > > >  fs/cifs/smb2pdu.h  |  8 ++++++++
> > > >  fs/cifs/smbfsctl.h |  1 +
> > > >  6 files changed, 75 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> > > > index a0212ec..81194e6 100644
> > > > --- a/fs/cifs/cifsglob.h
> > > > +++ b/fs/cifs/cifsglob.h
> > > > @@ -390,6 +390,9 @@ struct smb_version_operations {
> > > >       int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
> > > >                       struct cifsFileInfo *target_file, u64 src_off, u64 len,
> > > >                       u64 dest_off);
> > > > +     int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
> > > > +                     struct cifsFileInfo *target_file, u64 src_off, u64 len,
> > > > +                     u64 dest_off);
> > > >       int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
> > > >       ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
> > > >                       const unsigned char *, const unsigned char *, char *,
> > > > diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
> > > > index 998a66f..47b030d 100644
> > > > --- a/fs/cifs/cifspdu.h
> > > > +++ b/fs/cifs/cifspdu.h
> > > > @@ -2255,6 +2255,8 @@ typedef struct {
> > > >
> > > >
> > > >  /* List of FileSystemAttributes - see 2.5.1 of MS-FSCC */
> > > > +#define FILE_SUPPORTS_SPARSE_VDL     0x10000000 /* faster nonsparse extend */
> > > > +#define FILE_SUPPORTS_BLOCK_REFCOUNTING      0x08000000 /* allow ioctl dup extents */
> > > >  #define FILE_SUPPORT_INTEGRITY_STREAMS       0x04000000
> > > >  #define FILE_SUPPORTS_USN_JOURNAL    0x02000000
> > > >  #define FILE_SUPPORTS_OPEN_BY_FILE_ID        0x01000000
> > > > diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
> > > > index 8b7898b..7843b19 100644
> > > > --- a/fs/cifs/ioctl.c
> > > > +++ b/fs/cifs/ioctl.c
> > > > @@ -31,12 +31,14 @@
> > > >  #include "cifsproto.h"
> > > >  #include "cifs_debug.h"
> > > >  #include "cifsfs.h"
> > > > +#include <linux/btrfs.h>
> > > >
> > > >  #define CIFS_IOCTL_MAGIC     0xCF
> > > >  #define CIFS_IOC_COPYCHUNK_FILE      _IOW(CIFS_IOCTL_MAGIC, 3, int)
> > > >
> > > >  static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
> > > > -                     unsigned long srcfd, u64 off, u64 len, u64 destoff)
> > > > +                     unsigned long srcfd, u64 off, u64 len, u64 destoff,
> > > > +                     bool dup_extents)
> > > >  {
> > > >       int rc;
> > > >       struct cifsFileInfo *smb_file_target = dst_file->private_data;
> > > > @@ -109,9 +111,14 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
> > > >       truncate_inode_pages_range(&target_inode->i_data, destoff,
> > > >                                  PAGE_CACHE_ALIGN(destoff + len)-1);
> > > >
> > > > -     if (target_tcon->ses->server->ops->clone_range)
> > > > +     if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
> > > > +             rc = target_tcon->ses->server->ops->duplicate_extents(xid,
> > > > +                     smb_file_src, smb_file_target, off, len, destoff);
> > > > +     else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
> > > >               rc = target_tcon->ses->server->ops->clone_range(xid,
> > > >                       smb_file_src, smb_file_target, off, len, destoff);
> > > > +     else
> > > > +             rc = -EOPNOTSUPP;
> > > >
> > > >       /* force revalidate of size and timestamps of target file now
> > > >          that target is updated on the server */
> > > > @@ -205,7 +212,10 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
> > > >                       }
> > > >                       break;
> > > >               case CIFS_IOC_COPYCHUNK_FILE:
> > > > -                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
> > > > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
> > > > +                     break;
> > > > +             case BTRFS_IOC_CLONE:
> > > > +                     rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
> > >
> > > Any interest in supporting BTRFS_IOC_CLONE_RANGE or BTRFS_IOC_EXTENT_SAME?
> > > It looks like you could easily support the former, and the latter would
> > > enable things like duperemove.  I've been working on a pile of xfstests to
> > > exercise these three ioctls, will post them later today, I hope.
> > >
> > > --D
> > >
> >
> > So far Samba (server) only uses three btrfs ioctls, but that includes
> > clone range:
>
> Oh, my question was mostly about support for CLONE_RANGE within
> cifs.ko so that clients could ask for a reflink, which would then be
> sent off to the server as FSCTL_DUPLICATE_EXTENTS.  That doesn't seem
> too hard, but I didn't see it in ioctl.c and wondered why. :)
>
> >
> > ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_CLONE_RANGE ...
> > ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_DESTROY ...
> > ./source3/modules/vfs_btrfs.c:#define BTRFS_IOC_SNAP_CREATE_V2 ...
> >
> > But btrfs clone range is only (optionally if present) used to handle
> > the "CopyChunk" API (SMB3 and CIFS network protocol requests), and
> > Samba server doesn't have code for the FSCTL_DUPLICATE_EXTENTS fsctl
> > (SMB3 network protocol request) yet.  It looks trivial to map that to
> > BTRFS_IOC_CLONE_RANGE in the Samba server.   Would need to add trivial
> > parsing in smbd/smb2_ioctl_network_fs.c and a new VFS entry point in
> > the Samba VFS and a small helper routine in
> > source3/modules/vfs_btrfs.c
>
> Sounds fairly straightforward on the server side.  I'm working on adding
> the three ioctls I mentioned (CLONE, CLONE_RANGE, EXTENT_SAME) to XFS and
> others are working on it for ext4; do you think it would be difficult to
> adapt Samba server to talk to these three btrfs APIs even with a non-btrfs
> backend?
>
> (Or, maybe someday we might refactor all this into a common syscall or
> something.)
>
> I guess BTRFS_IOC_EXTENT_SAME would be harder since you'd want to compare
> file contents on the server, and I'm not sure if SMB can actually do that.
>


 cifs.ko with the recent patches, does support IOC_CLONE (ie
BTRFS_IOC_CLONE) but I didn't add BTRFS_CLONE_RANGE which would be
easy enough to add to cifs.ko (although would be a little better, and
perhaps less confusing, if there were a system ioctl definition that
was an exact equivalent of BTRFS_IOC_CLONE and BTRFS_IOC_CLONE_RANGE
but didn't use the name BTRFS, but last I checked the cp command it
only knows about BTRFS_IOC_CLONE so we are stuck using that ioctl
number).

If you call CIFS_IOC_COPYCHUNK_FILE ioctl today in cifs.ko (even
without the patches), for SMB3 mounts it will send a
FSCTL_SRV_COPYCHUNK_WRITE SMB3 request to the server which Samba will
either emulate in user space as a somewhat faster file copy, or pass
directly to btrfs if vfs_btrfs is loaded and the server will do a
BTRFS_IOC_CLONE_RANGE.

With the recent patch to cifs.ko it will be easier since for cifs
--reflink we will only issue DUPLICATE_EXTENTS IOCTL over the wire
(which Samba can convert to BRTFS_IOC_CLONE or BTRFS_IOC_CLONE_RANGE)
if the server advertises the file system support for the corresponding
attribute flag.

Patch
diff mbox

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index a0212ec..81194e6 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -390,6 +390,9 @@  struct smb_version_operations {
 	int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
 			struct cifsFileInfo *target_file, u64 src_off, u64 len,
 			u64 dest_off);
+	int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
+			struct cifsFileInfo *target_file, u64 src_off, u64 len,
+			u64 dest_off);
 	int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
 	ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
 			const unsigned char *, const unsigned char *, char *,
diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
index 998a66f..47b030d 100644
--- a/fs/cifs/cifspdu.h
+++ b/fs/cifs/cifspdu.h
@@ -2255,6 +2255,8 @@  typedef struct {
 
 
 /* List of FileSystemAttributes - see 2.5.1 of MS-FSCC */
+#define FILE_SUPPORTS_SPARSE_VDL	0x10000000 /* faster nonsparse extend */
+#define FILE_SUPPORTS_BLOCK_REFCOUNTING	0x08000000 /* allow ioctl dup extents */
 #define FILE_SUPPORT_INTEGRITY_STREAMS	0x04000000
 #define FILE_SUPPORTS_USN_JOURNAL	0x02000000
 #define FILE_SUPPORTS_OPEN_BY_FILE_ID	0x01000000
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 8b7898b..7843b19 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -31,12 +31,14 @@ 
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifsfs.h"
+#include <linux/btrfs.h>
 
 #define CIFS_IOCTL_MAGIC	0xCF
 #define CIFS_IOC_COPYCHUNK_FILE	_IOW(CIFS_IOCTL_MAGIC, 3, int)
 
 static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
-			unsigned long srcfd, u64 off, u64 len, u64 destoff)
+			unsigned long srcfd, u64 off, u64 len, u64 destoff,
+			bool dup_extents)
 {
 	int rc;
 	struct cifsFileInfo *smb_file_target = dst_file->private_data;
@@ -109,9 +111,14 @@  static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
 	truncate_inode_pages_range(&target_inode->i_data, destoff,
 				   PAGE_CACHE_ALIGN(destoff + len)-1);
 
-	if (target_tcon->ses->server->ops->clone_range)
+	if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
+		rc = target_tcon->ses->server->ops->duplicate_extents(xid,
+			smb_file_src, smb_file_target, off, len, destoff);
+	else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
 		rc = target_tcon->ses->server->ops->clone_range(xid,
 			smb_file_src, smb_file_target, off, len, destoff);
+	else
+		rc = -EOPNOTSUPP;
 
 	/* force revalidate of size and timestamps of target file now
 	   that target is updated on the server */
@@ -205,7 +212,10 @@  long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 			}
 			break;
 		case CIFS_IOC_COPYCHUNK_FILE:
-			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
+			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
+			break;
+		case BTRFS_IOC_CLONE:
+			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
 			break;
 		default:
 			cifs_dbg(FYI, "unsupported ioctl\n");
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index c7d228c..b1e9c0f 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -806,6 +806,53 @@  smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
 			    cfile->fid.volatile_fid, cfile->pid, &eof, false);
 }
 
+#ifdef CONFIG_CIFS_SMB311
+static int
+smb2_duplicate_extents(const unsigned int xid,
+			struct cifsFileInfo *srcfile,
+			struct cifsFileInfo *trgtfile, u64 src_off,
+			u64 len, u64 dest_off)
+{
+	int rc;
+	unsigned int ret_data_len;
+	char *retbuf = NULL;
+	struct duplicate_extents_to_file dup_ext_buf;
+	struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
+
+	/* server fileays advertise duplicate extent support with this flag */
+	if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
+	     FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
+		return -EOPNOTSUPP;
+
+	dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
+	dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
+	dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
+	dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
+	dup_ext_buf.ByteCount = cpu_to_le64(len);
+	cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
+		src_off, dest_off, len);
+
+	rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
+	if (rc)
+		goto duplicate_extents_out;
+
+	rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
+			trgtfile->fid.volatile_fid,
+			FSCTL_DUPLICATE_EXTENTS_TO_FILE,
+			true /* is_fsctl */, (char *)&dup_ext_buf,
+			sizeof(struct duplicate_extents_to_file),
+			(char **)&retbuf,
+			&ret_data_len);
+
+	if (ret_data_len > 0)
+		cifs_dbg(FYI, "non-zero response length in duplicate extents");
+
+duplicate_extents_out:
+	return rc;
+}
+#endif /* CONFIG_CIFS_SMB311 */
+
+
 static int
 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
 		   struct cifsFileInfo *cfile)
@@ -1714,6 +1761,7 @@  struct smb_version_operations smb311_operations = {
 	.create_lease_buf = smb3_create_lease_buf,
 	.parse_lease_buf = smb3_parse_lease_buf,
 	.clone_range = smb2_clone_range,
+	.duplicate_extents = smb2_duplicate_extents,
 /*	.validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
 	.wp_retry_size = smb2_wp_retry_size,
 	.dir_needs_close = smb2_dir_needs_close,
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 725283a..8e7bbe5 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -654,6 +654,14 @@  struct compress_ioctl {
 	__le16 CompressionState; /* See cifspdu.h for possible flag values */
 } __packed;
 
+struct duplicate_extents_to_file {
+	__u64 PersistentFileHandle; /* source file handle, opaque endianness */
+	__u64 VolatileFileHandle;
+	__le64 SourceFileOffset;
+	__le64 TargetFileOffset;
+	__le64 ByteCount;  /* Bytes to be copied */
+} __packed;
+
 struct smb2_ioctl_req {
 	struct smb2_hdr hdr;
 	__le16 StructureSize;	/* Must be 57 */
diff --git a/fs/cifs/smbfsctl.h b/fs/cifs/smbfsctl.h
index 83efa59..d098da6 100644
--- a/fs/cifs/smbfsctl.h
+++ b/fs/cifs/smbfsctl.h
@@ -78,6 +78,7 @@ 
 #define FSCTL_QUERY_ALLOCATED_RANGES 0x000940CF /* BB add struct */
 #define FSCTL_SET_DEFECT_MANAGEMENT  0x00098134 /* BB add struct */
 #define FSCTL_FILE_LEVEL_TRIM        0x00098208 /* BB add struct */
+#define FSCTL_DUPLICATE_EXTENTS_TO_FILE 0x00098344
 #define FSCTL_SIS_LINK_FILES         0x0009C104
 #define FSCTL_PIPE_PEEK              0x0011400C /* BB add struct */
 #define FSCTL_PIPE_TRANSCEIVE        0x0011C017 /* BB add struct */