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https://github.com/versity/scoutfs-go.git
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query by metaseq and dataseq interface
This commit is contained in:
Ben McClelland
218
scoutfsdefs.go
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218
scoutfsdefs.go
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@@ -0,0 +1,218 @@
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// Copyright (c) 2018 Versity Software, Inc.
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//
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// Use of this source code is governed by a BSD-3-Clause license
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// that can be found in the LICENSE file in the root of the source
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// tree.
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package scoutfs
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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)
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const (
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//IOCQUERYINODES scoutfs ioctl
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IOCQUERYINODES = 0x40357301
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//IOCINOPATH scoutfs ioctl
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IOCINOPATH = 0x401c7302
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//IOCDATAVERSION scoutfs ioctl
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IOCDATAVERSION = 0x40087304
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//IOCRELEASE scoutfs ioctl
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IOCRELEASE = 0x40187305
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//IOCSTAGE scoutfs ioctl
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IOCSTAGE = 0x401c7306
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//IOCSTATMORE scoutfs ioctl
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IOCSTATMORE = 0x40207307
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//QUERYINODESMETASEQ find inodes by metadata sequence
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QUERYINODESMETASEQ = '\u0000'
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//QUERYINODESDATASEQ find inodes by data sequence
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QUERYINODESDATASEQ = '\u0001'
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)
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/* pahole for scoutfs_ioctl_walk_inodes_entry
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struct scoutfs_ioctl_walk_inodes_entry {
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__u64 major; // 0 8
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__u32 minor; // 8 4
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__u64 ino; // 12 8
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// size: 20, cachelines: 1, members: 3
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// last cacheline: 20 bytes
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};
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*/
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//InodesEntry is scoutfs entry for inode iteration
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type InodesEntry struct {
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Major uint64
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Minor uint32
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Ino uint64
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}
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/* pahole for scoutfs_ioctl_walk_inodes
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struct scoutfs_ioctl_walk_inodes {
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struct scoutfs_ioctl_walk_inodes_entry first; // 0 20
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struct scoutfs_ioctl_walk_inodes_entry last; // 20 20
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__u64 entries_ptr; // 40 8
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__u32 nr_entries; // 48 4
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__u8 index; // 52 1
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// size: 53, cachelines: 1, members: 5
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// last cacheline: 53 bytes
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};
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*/
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//queryInodes is scoutfs request structure for IOCQUERYINODES
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type queryInodes struct {
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first InodesEntry
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last InodesEntry
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entries uintptr
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count uint32
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index uint8
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}
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//packed scoutfs_ioctl_walk_inodes requires packing queryInodes byhand
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//the 53 size comes from pahole output above
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func (q queryInodes) pack() ([53]byte, error) {
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var pack [53]byte
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var pbuf = bytes.NewBuffer(make([]byte, 0, len(pack)))
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if err := binary.Write(pbuf, binary.LittleEndian, q.first.Major); err != nil {
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return [53]byte{}, fmt.Errorf("pack first.Major: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, q.first.Minor); err != nil {
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return [53]byte{}, fmt.Errorf("pack first.Minor: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, q.first.Ino); err != nil {
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return [53]byte{}, fmt.Errorf("pack first.Ino: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, q.last.Major); err != nil {
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return [53]byte{}, fmt.Errorf("pack last.Major: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, q.last.Minor); err != nil {
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return [53]byte{}, fmt.Errorf("pack last.Minor: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, q.last.Ino); err != nil {
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return [53]byte{}, fmt.Errorf("pack last.Ino: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, uint64(q.entries)); err != nil {
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return [53]byte{}, fmt.Errorf("pack entries: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, q.count); err != nil {
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return [53]byte{}, fmt.Errorf("pack count: %v", err)
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}
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if err := binary.Write(pbuf, binary.LittleEndian, q.index); err != nil {
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return [53]byte{}, fmt.Errorf("pack index: %v", err)
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}
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if err := binary.Read(pbuf, binary.LittleEndian, &pack); err != nil {
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return [53]byte{}, fmt.Errorf("read packed: %v", err)
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}
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return pack, nil
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}
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/* pahole for scoutfs_ioctl_ino_path
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struct scoutfs_ioctl_ino_path {
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__u64 ino; // 0 8
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__u64 dir_ino; // 8 8
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__u64 dir_pos; // 16 8
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__u64 result_ptr; // 24 8
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__u16 result_bytes; // 32 2
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// size: 34, cachelines: 1, members: 5
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// last cacheline: 34 bytes
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};
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*/
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// InoPath ioctl struct
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type InoPath struct {
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Ino uint64
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DirIno uint64
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DirPos uint64
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ResultPtr uint64
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ResultBytes uint64
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}
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/* pahole for scoutfs_ioctl_ino_path_result
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struct scoutfs_ioctl_ino_path_result {
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__u64 dir_ino; // 0 8
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__u64 dir_pos; // 8 8
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__u16 path_bytes; // 16 2
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__u8 path[0]; // 18 0
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// size: 18, cachelines: 1, members: 4
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// last cacheline: 18 bytes
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};
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*/
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// InoPathResult ioctl struct
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type InoPathResult struct {
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DirIno uint64
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DirPos uint64
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PathBytes uint16
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ResultBytes uint64
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}
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/* pahole for scoutfs_ioctl_release
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struct scoutfs_ioctl_release {
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__u64 block; // 0 8
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__u64 count; // 8 8
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__u64 data_version; // 16 8
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// size: 24, cachelines: 1, members: 3
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// last cacheline: 24 bytes
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};
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*/
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// IocRelease ioctl struct
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type IocRelease struct {
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Block uint64
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Count uint64
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DataVersion uint64
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}
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/* pahole for scoutfs_ioctl_stage
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struct scoutfs_ioctl_stage {
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__u64 data_version; // 0 8
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__u64 buf_ptr; // 8 8
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__u64 offset; // 16 8
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__s32 count; // 24 4
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// size: 28, cachelines: 1, members: 4
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// last cacheline: 28 bytes
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};
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*/
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// IocStage ioctl struct
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type IocStage struct {
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DataVersion uint64
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BufPtr uint64
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Offset uint64
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count int32
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}
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/* pahole for scoutfs_ioctl_stat_more
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struct scoutfs_ioctl_stat_more {
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__u64 valid_bytes; // 0 8
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__u64 meta_seq; // 8 8
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__u64 data_seq; // 16 8
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__u64 data_version; // 24 8
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__u64 online_blocks; // 32 8
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__u64 offline_blocks; // 40 8
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// size: 48, cachelines: 1, members: 6
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// last cacheline: 48 bytes
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};
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*/
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//Stat holds scoutfs specific per file metadata
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type Stat struct {
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ValidBytes uint64
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MetaSeq uint64
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DataSeq uint64
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DataVersion uint64
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OnlineBlocks uint64
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OfflineBlocks uint64
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}
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