Re: [PATCHv2] [CIFS] Allow setting per-file compression via CIFS protocol

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On Sun, 13 Oct 2013 22:33:07 -0500
Steve French <smfrench@xxxxxxxxx> wrote:

> (PATCHv2 updated to address build problem with SMB2 disabled in .config)
> 
> An earlier patch allowed setting the per-file compression flag
> 
> "chattr +c filename"
> 
> on an smb2 or smb3 mount, and also allowed lsattr to return
> whether a file on a cifs, or smb2/smb3 mount was compressed.
> 
> This patch extends the ability to set the per-file
> compression flag to the cifs protocol, which uses a somewhat
> different IOCTL mechanism than SMB2, although the payload
> (the flags stored in the compression_state) are the same.
> 
> Signed-off-by: Steve French <smfrench@xxxxxxxxx>
> ---
>  fs/cifs/cifspdu.h   | 29 +++++++++++++++++++++++++++++
>  fs/cifs/cifsproto.h |  2 ++
>  fs/cifs/cifssmb.c   | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>  fs/cifs/smb1ops.c   |  8 ++++++++
>  fs/cifs/smb2pdu.h   |  9 ++++++---
>  5 files changed, 98 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
> index d40bd77..f9bb497 100644
> --- a/fs/cifs/cifspdu.h
> +++ b/fs/cifs/cifspdu.h
> @@ -1352,6 +1352,35 @@ typedef struct smb_com_transaction_ioctl_req {
>      __u8 Data[1];
>  } __attribute__((packed)) TRANSACT_IOCTL_REQ;
> 
> +typedef struct smb_com_transaction_compr_ioctl_req {
> +    struct smb_hdr hdr;    /* wct = 23 */
> +    __u8 MaxSetupCount;
> +    __u16 Reserved;
> +    __le32 TotalParameterCount;
> +    __le32 TotalDataCount;
> +    __le32 MaxParameterCount;
> +    __le32 MaxDataCount;
> +    __le32 ParameterCount;
> +    __le32 ParameterOffset;
> +    __le32 DataCount;
> +    __le32 DataOffset;
> +    __u8 SetupCount; /* four setup words follow subcommand */
> +    /* SNIA spec incorrectly included spurious pad here */
> +    __le16 SubCommand; /* 2 = IOCTL/FSCTL */
> +    __le32 FunctionCode;
> +    __u16 Fid;
> +    __u8 IsFsctl;  /* 1 = File System Control 0 = device control (IOCTL) */
> +    __u8 IsRootFlag; /* 1 = apply command to root of share (must be DFS) */
> +    __le16 ByteCount;
> +    __u8 Pad[3];
> +    __le16 compression_state;  /* See below for valid flags */
> +} __attribute__((packed)) TRANSACT_COMPR_IOCTL_REQ;
> +
> +/* compression state flags */
> +#define COMPRESSION_FORMAT_NONE        0x0000
> +#define COMPRESSION_FORMAT_DEFAULT    0x0001
> +#define COMPRESSION_FORMAT_LZNT1    0x0002
> +
>  typedef struct smb_com_transaction_ioctl_rsp {
>      struct smb_hdr hdr;    /* wct = 19 */
>      __u8 Reserved[3];
> diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
> index b5ec2a2..aa33976 100644
> --- a/fs/cifs/cifsproto.h
> +++ b/fs/cifs/cifsproto.h
> @@ -360,6 +360,8 @@ extern int CIFSSMBUnixQuerySymLink(const unsigned int xid,
>  extern int CIFSSMBQuerySymLink(const unsigned int xid, struct cifs_tcon *tcon,
>                     __u16 fid, char **symlinkinfo,
>                     const struct nls_table *nls_codepage);
> +extern int CIFSSMB_set_compression(const unsigned int xid,
> +                   struct cifs_tcon *tcon, __u16 fid);
>  extern int CIFSSMBOpen(const unsigned int xid, struct cifs_tcon *tcon,
>              const char *fileName, const int disposition,
>              const int access_flags, const int omode,
> diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
> index ccd31ab..ec57dde 100644
> --- a/fs/cifs/cifssmb.c
> +++ b/fs/cifs/cifssmb.c
> @@ -3199,6 +3199,59 @@ qreparse_out:
>      return rc;
>  }
> 
> +int
> +CIFSSMB_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
> +            __u16 fid)
> +{
> +    int rc = 0;
> +    int bytes_returned;
> +    struct smb_com_transaction_compr_ioctl_req *pSMB;
> +    struct smb_com_transaction_ioctl_rsp *pSMBr;
> +
> +    cifs_dbg(FYI, "Set compression for %u\n", fid);
> +    rc = smb_init(SMB_COM_NT_TRANSACT, 23, tcon, (void **) &pSMB,
> +              (void **) &pSMBr);
> +    if (rc)
> +        return rc;
> +
> +    pSMB->compression_state = cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
> +
> +    pSMB->TotalParameterCount = 0;
> +    pSMB->TotalDataCount = cpu_to_le32(2);

Most of these sorts of calls where you're plugging in hardcoded values
can be "__constant_cpu_to_le32(...)".

> +    pSMB->MaxParameterCount = 0;
> +    pSMB->MaxDataCount = 0;
> +    pSMB->MaxSetupCount = 4;
> +    pSMB->Reserved = 0;
> +    pSMB->ParameterOffset = 0;
> +    pSMB->DataCount = cpu_to_le32(2);
> +    pSMB->DataOffset =
> +        cpu_to_le32(offsetof(struct smb_com_transaction_compr_ioctl_req,
> +                compression_state) - 4);  /* 84 */
> +    pSMB->SetupCount = 4;
> +    pSMB->SubCommand = cpu_to_le16(NT_TRANSACT_IOCTL);
> +    pSMB->ParameterCount = 0;
> +    pSMB->FunctionCode = cpu_to_le32(FSCTL_SET_COMPRESSION);
> +    pSMB->IsFsctl = 1; /* FSCTL */
> +    pSMB->IsRootFlag = 0;
> +    pSMB->Fid = fid; /* file handle always le */
> +    pSMB->ByteCount = cpu_to_le16(5); /* 3 byte pad 2 byte compress state */
> +    inc_rfc1001_len(pSMB, 5);
> +
> +    rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
> +             (struct smb_hdr *) pSMBr, &bytes_returned, 0);
> +    if (rc)
> +        cifs_dbg(FYI, "Send error in SetCompression = %d\n", rc);
> +
> +    cifs_buf_release(pSMB);
> +
> +    /*
> +     * Note: On -EAGAIN error only caller can retry on handle based calls
> +     * since file handle passed in no longer valid.
> +     */
> +    return rc;
> +}
> +
> +
>  #ifdef CONFIG_CIFS_POSIX
> 
>  /*Convert an Access Control Entry from wire format to local POSIX
> xattr format*/
> diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
> index 8233b17..ea99efe 100644
> --- a/fs/cifs/smb1ops.c
> +++ b/fs/cifs/smb1ops.c
> @@ -807,6 +807,13 @@ out:
>  }
> 
>  static int
> +cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
> +           struct cifsFileInfo *cfile)
> +{
> +    return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
> +}
> +
> +static int
>  cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
>               const char *path, struct cifs_sb_info *cifs_sb,
>               struct cifs_fid *fid, __u16 search_flags,
> @@ -956,6 +963,7 @@ struct smb_version_operations smb1_operations = {
>      .set_path_size = CIFSSMBSetEOF,
>      .set_file_size = CIFSSMBSetFileSize,
>      .set_file_info = smb_set_file_info,
> +    .set_compression = cifs_set_compression,
>      .echo = CIFSSMBEcho,
>      .mkdir = CIFSSMBMkDir,
>      .mkdir_setinfo = cifs_mkdir_setinfo,
> diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
> index 7e44f18..2a72ef2 100644
> --- a/fs/cifs/smb2pdu.h
> +++ b/fs/cifs/smb2pdu.h
> @@ -573,9 +573,12 @@ struct compress_ioctl {
>      __le16 CompressionState;
>  } __packed;
> 
> -#define COMPRESSION_FORMAT_NONE        0x0000
> -#define COMPRESSION_FORMAT_DEFAULT    0x0001
> -#define COMPRESSION_FORMAT_LZNT1    0x0002
> +/*
> + * These defines have been moved to cifspdu.h
> + * #define COMPRESSION_FORMAT_NONE    0x0000
> + * #define COMPRESSION_FORMAT_DEFAULT    0x0001
> + * #define COMPRESSION_FORMAT_LZNT1    0x0002
> + */

Just remove these instead of commenting them out, please.

>  struct smb2_ioctl_req {
>      struct smb2_hdr hdr;
>      __le16 StructureSize;    /* Must be 57 */


Looks good otherwise...

Acked-by: Jeff Layton <jlayton@xxxxxxxxxx>
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