forked from ccfos/huatuo
102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
// Copyright 2025 The HuaTuo Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"bytes"
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"encoding/binary"
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"io"
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"os"
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"huatuo-bamai/internal/log"
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)
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// xfs_util maps superblocks of XFS devices to retrieve
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// essential information from superblock.
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const (
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XFS_SB_MAGIC = 0x58465342
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XFSLABEL_MAX = 12
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)
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// Construct the XFS superblock, hiding unused variables
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type xfsSuperBlock struct {
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SbMagicnum uint32
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SbBlocksize uint32
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_ [16]byte
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_ [7]uint64
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_ [4]uint32
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SbLogblocks uint32
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_ [6]uint16
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_ [XFSLABEL_MAX]byte
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_ [12]uint8
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_ [8]uint64
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_ [12]uint32
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_ [16]byte
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}
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func fileLineCounter(filePath string) (int, error) {
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count := 0
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buf := make([]byte, 8*20*4096)
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file, err := os.Open(filePath)
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if err != nil {
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return count, err
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}
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defer file.Close()
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r := io.Reader(file)
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for {
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c, err := r.Read(buf)
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count += bytes.Count(buf[:c], []byte("\n"))
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if err == io.EOF {
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break
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}
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if err != nil {
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return count, err
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}
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}
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return count, nil
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}
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// Calculate the Xlog size from superblock
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func xfsLogSize(path string) (float64, error) {
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file, err := os.Open(path)
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if err != nil {
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log.Infof("open failed: %v", err)
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return -1, err
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}
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defer file.Close()
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var sb xfsSuperBlock
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err = binary.Read(file, binary.BigEndian, &sb)
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if err != nil {
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log.Infof("read superblock failed: err%v", err)
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return -1, err
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}
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// Check Magic Number of Super Block
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if sb.SbMagicnum != XFS_SB_MAGIC {
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log.Infof("Not a valid XFS superblock (Magic: 0x%x)", sb.SbMagicnum)
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return -1, err
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}
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xlogBytes := float64(sb.SbLogblocks * sb.SbBlocksize)
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return xlogBytes, nil
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}
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