Allow setting per-file compression via CIFS protocol
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.
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index ccd31ab..93b2947 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3199,6 +3199,60 @@
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 = __constant_cpu_to_le32(2);
+ pSMB->MaxParameterCount = 0;
+ pSMB->MaxDataCount = 0;
+ pSMB->MaxSetupCount = 4;
+ pSMB->Reserved = 0;
+ pSMB->ParameterOffset = 0;
+ pSMB->DataCount = __constant_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 = __constant_cpu_to_le16(NT_TRANSACT_IOCTL);
+ pSMB->ParameterCount = 0;
+ pSMB->FunctionCode = __constant_cpu_to_le32(FSCTL_SET_COMPRESSION);
+ pSMB->IsFsctl = 1; /* FSCTL */
+ pSMB->IsRootFlag = 0;
+ pSMB->Fid = fid; /* file handle always le */
+ /* 3 byte pad, followed by 2 byte compress state */
+ pSMB->ByteCount = __constant_cpu_to_le16(5);
+ 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+ * since file handle passed in no longer valid.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*/