add read xattr totals

c_defs_linux.go

@@ -1,4 +1,4 @@
-// +build ignore
+//go:build ignore
 
 // Copyright (c) 2018 Versity Software, Inc.
 //
@@ -51,6 +51,8 @@ package scoutfs
 // typedef struct scoutfs_ioctl_search_xattrs scoutfs_ioctl_search_xattrs_t;
 // typedef struct scoutfs_ioctl_statfs_more scoutfs_ioctl_statfs_more_t;
 // typedef struct scoutfs_ioctl_alloc_detail scoutfs_ioctl_alloc_detail_t;
+// typedef struct scoutfs_ioctl_read_xattr_totals scoutfs_ioctl_read_xattr_totals_t;
+// typedef struct scoutfs_ioctl_xattr_total scoutfs_ioctl_xattr_total_t;
 //
 // // Go doesnt handle bitfields in structs, so we need to override the scoutfs
 // // struct definition here
@@ -78,6 +80,7 @@ const IOCSTATFSMORE = C.SCOUTFS_IOC_STATFS_MORE
 const IOCDATAWAITERR = C.SCOUTFS_IOC_DATA_WAIT_ERR
 const IOCALLOCDETAIL = C.SCOUTFS_IOC_ALLOC_DETAIL
 const IOCMOVEBLOCKS = C.SCOUTFS_IOC_MOVE_BLOCKS
+const IOCREADXATTRTOTALS = C.SCOUTFS_IOC_READ_XATTR_TOTALS
 
 const QUERYINODESMETASEQ = C.SCOUTFS_IOC_WALK_INODES_META_SEQ
 const QUERYINODESDATASEQ = C.SCOUTFS_IOC_WALK_INODES_DATA_SEQ
@@ -106,5 +109,8 @@ type statfsMore C.scoutfs_ioctl_statfs_more_t
 type allocDetail C.scoutfs_ioctl_alloc_detail_t
 type allocDetailEntry C.scoutfs_ioctl_alloc_detail_entry_t
 type moveBlocks C.scoutfs_ioctl_move_blocks_t
+type readXattrTotals C.scoutfs_ioctl_read_xattr_totals_t
+type xattrTotal C.scoutfs_ioctl_xattr_total_t
 
 const sizeofstatfsMore = C.sizeof_scoutfs_ioctl_statfs_more_t
+const sizeofxattrTotal = C.sizeof_scoutfs_ioctl_xattr_total_t

examples/gettotl/main.go

@@ -0,0 +1,50 @@
+// Copyright (c) 2021 Versity Software, Inc.
+//
+// Use of this source code is governed by a BSD-3-Clause license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+
+	scoutfs "github.com/versity/scoutfs-go"
+)
+
+func main() {
+	if len(os.Args) != 5 || os.Args[1] == "-h" {
+		fmt.Fprintln(os.Stderr, "usage:", os.Args[0], "<scoutfs mount point> <id1> <id2> <id3>")
+		os.Exit(1)
+	}
+
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatalln("error open mount:", err)
+	}
+	defer f.Close()
+
+	u1, err := strconv.ParseUint(os.Args[2], 10, 64)
+	if err != nil {
+		log.Fatalln("error parsing id1:", err)
+	}
+	u2, err := strconv.ParseUint(os.Args[3], 10, 64)
+	if err != nil {
+		log.Fatalln("error parsing id2:", err)
+	}
+	u3, err := strconv.ParseUint(os.Args[4], 10, 64)
+	if err != nil {
+		log.Fatalln("error parsing id3:", err)
+	}
+
+	t, err := scoutfs.ReadXattrTotals(f, u1, u2, u3)
+	if err != nil {
+		log.Fatalln("error read totals:", err)
+	}
+
+	fmt.Println("xattrs match: ", t.Count)
+	fmt.Println("total value : ", t.Total)
+}

scoutfs.go

@@ -10,6 +10,7 @@ import (
 	"bufio"
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -863,3 +864,41 @@ func StageMoveAt(from, to *os.File, len, fromOffset, toOffset, version uint64) e
 
 	return nil
 }
+
+// XattrTotal has the total values matching id triple
+type XattrTotal struct {
+	// Total is sum of all xattr values matching ids
+	Total uint64
+	// Count is number of xattrs matching ids
+	Count uint64
+}
+
+var (
+	// ErrNoTotal is a special error case indicating that there were
+	// no xattrs matching the totl ids
+	ErrNoTotal = errors.New("no totl found")
+)
+
+// ReadXattrTotals returns the XattrTotal for the given id
+func ReadXattrTotals(f *os.File, id1, id2, id3 uint64) (XattrTotal, error) {
+	totls := make([]xattrTotal, 1)
+
+	query := readXattrTotals{
+		Pos_name:     [3]uint64{id1, id2, id3},
+		Totals_ptr:   uint64(uintptr(unsafe.Pointer(&totls[0]))),
+		Totals_bytes: sizeofxattrTotal,
+	}
+
+	n, err := scoutfsctl(f, IOCREADXATTRTOTALS, unsafe.Pointer(&query))
+	if err != nil {
+		return XattrTotal{}, err
+	}
+	if n == 0 {
+		return XattrTotal{}, ErrNoTotal
+	}
+
+	return XattrTotal{
+		Total: totls[0].Total,
+		Count: totls[0].Count,
+	}, nil
+}

scoutfsdefs.go

@@ -16,6 +16,7 @@ const IOCSTATFSMORE = 0x8038730a
 const IOCDATAWAITERR = 0x8030730b
 const IOCALLOCDETAIL = 0x8010730c
 const IOCMOVEBLOCKS = 0x8030730d
+const IOCREADXATTRTOTALS = 0x8028730f
 
 const QUERYINODESMETASEQ = 0x0
 const QUERYINODESDATASEQ = 0x1
@@ -148,5 +149,16 @@ type moveBlocks struct {
 	Data_version	uint64
 	Flags		uint64
 }
+type readXattrTotals struct {
+	Pos_name	[3]uint64
+	Totals_ptr	uint64
+	Totals_bytes	uint64
+}
+type xattrTotal struct {
+	Name	[3]uint64
+	Total	uint64
+	Count	uint64
+}
 
 const sizeofstatfsMore = 0x38
+const sizeofxattrTotal = 0x28