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c308e096da
Instead of passing lazy_itable_init=1 and lazy_journal_init=1 to mkfs.ext4, pass assume_storage_prezeroed=1 which is stronger and allows the filesystem to skip inode table zeroing completely instead of simply doing it lazily. The support for this flag is checked by trying to format a fake temporary image with mkfs.ext4 and checking its STDERR. Closes: #4948 Signed-off-by: Niraj Yadav <niryadav@redhat.com>
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
/*
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Copyright 2024 The Ceph-CSI Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package file
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import (
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"fmt"
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"os"
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)
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// CreateTempFile create a temporary file with the given string
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// content and returns the reference to the file.
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// The caller is responsible for disposing the file.
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func CreateTempFile(prefix, contents string) (*os.File, error) {
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// Create a temp file
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file, err := os.CreateTemp("", prefix)
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if err != nil {
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return nil, fmt.Errorf("failed to create temporary file: %w", err)
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}
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// In case of error, remove the file if it was created
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defer func() {
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if err != nil {
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_ = os.Remove(file.Name())
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}
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}()
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// Write the contents
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var c int
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c, err = file.WriteString(contents)
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if err != nil || c != len(contents) {
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return nil, fmt.Errorf("failed to write temporary file: %w", err)
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}
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// Close the handle
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if err = file.Close(); err != nil {
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return nil, fmt.Errorf("failed to close temporary file: %w", err)
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}
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return file, nil
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}
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// CreateSpareFile makes `file` a sparse file of size `sizeMB`.
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func CreateSparseFile(file *os.File, sizeMB int64) error {
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sizeBytes := sizeMB * 1024 * 1024
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// seek to the end of the file.
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if _, err := file.Seek(sizeBytes-1, 0); err != nil {
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return fmt.Errorf("failed to seek to the end of the file: %w", err)
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}
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// write a single byte, effectively making it a sparse file.
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if _, err := file.Write([]byte{0}); err != nil {
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return fmt.Errorf("failed to write to the end of the file: %w", err)
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}
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return nil
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}
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