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[#970] fstree: Move write functions to a separate file

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Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
This commit is contained in:
Evgenii Stratonikov 2024-02-01 10:28:31 +03:00 committed by Evgenii Stratonikov
parent 9a622a750d
commit ff488b53a1
2 changed files with 74 additions and 63 deletions
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63
pkg/local_object_storage/blobstor/fstree/fstree.go
View file

@ -360,69 +360,6 @@ func (t *FSTree) Put(ctx context.Context, prm common.PutPrm) (common.PutRes, err
return common.PutRes{StorageID: []byte{}}, t.writeData(p, prm.RawData)
}
func (t *FSTree) writeData(p string, data []byte) error {
tmpPath := p + "#" + strconv.FormatUint(t.suffix.Add(1), 10)
return t.writeAndRename(tmpPath, p, data)
}
// writeAndRename opens tmpPath exclusively, writes data to it and renames it to p.
func (t *FSTree) writeAndRename(tmpPath, p string, data []byte) error {
if t.fileCounterEnabled {
t.fileGuard.Lock(p)
defer t.fileGuard.Unlock(p)
}
err := t.writeFile(tmpPath, data)
if err != nil {
var pe *fs.PathError
if errors.As(err, &pe) {
switch pe.Err {
case syscall.ENOSPC:
err = common.ErrNoSpace
_ = os.RemoveAll(tmpPath)
}
}
return err
}
if t.fileCounterEnabled {
t.fileCounter.Inc()
var targetFileExists bool
if _, e := os.Stat(p); e == nil {
targetFileExists = true
}
err = os.Rename(tmpPath, p)
if err == nil && targetFileExists {
t.fileCounter.Dec()
}
} else {
err = os.Rename(tmpPath, p)
}
return err
}
func (t *FSTree) writeFlags() int {
flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC | os.O_EXCL
if t.noSync {
return flags
}
return flags | os.O_SYNC
}
// writeFile writes data to a file with path p.
// The code is copied from `os.WriteFile` with minor corrections for flags.
func (t *FSTree) writeFile(p string, data []byte) error {
f, err := os.OpenFile(p, t.writeFlags(), t.Permissions)
if err != nil {
return err
}
_, err = f.Write(data)
if err1 := f.Close(); err1 != nil && err == nil {
err = err1
}
return err
}
// Get returns an object from the storage by address.
func (t *FSTree) Get(ctx context.Context, prm common.GetPrm) (common.GetRes, error) {
var (

74
pkg/local_object_storage/blobstor/fstree/fstree_write_generic.go Normal file
View file

@ -0,0 +1,74 @@
package fstree
import (
"errors"
"io/fs"
"os"
"strconv"
"syscall"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
)
func (t *FSTree) writeData(p string, data []byte) error {
tmpPath := p + "#" + strconv.FormatUint(t.suffix.Add(1), 10)
return t.writeAndRename(tmpPath, p, data)
}
// writeAndRename opens tmpPath exclusively, writes data to it and renames it to p.
func (t *FSTree) writeAndRename(tmpPath, p string, data []byte) error {
if t.fileCounterEnabled {
t.fileGuard.Lock(p)
defer t.fileGuard.Unlock(p)
}
err := t.writeFile(tmpPath, data)
if err != nil {
var pe *fs.PathError
if errors.As(err, &pe) {
switch pe.Err {
case syscall.ENOSPC:
err = common.ErrNoSpace
_ = os.RemoveAll(tmpPath)
}
}
return err
}
if t.fileCounterEnabled {
t.fileCounter.Inc()
var targetFileExists bool
if _, e := os.Stat(p); e == nil {
targetFileExists = true
}
err = os.Rename(tmpPath, p)
if err == nil && targetFileExists {
t.fileCounter.Dec()
}
} else {
err = os.Rename(tmpPath, p)
}
return err
}
func (t *FSTree) writeFlags() int {
flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC | os.O_EXCL
if t.noSync {
return flags
}
return flags | os.O_SYNC
}
// writeFile writes data to a file with path p.
// The code is copied from `os.WriteFile` with minor corrections for flags.
func (t *FSTree) writeFile(p string, data []byte) error {
f, err := os.OpenFile(p, t.writeFlags(), t.Permissions)
if err != nil {
return err
}
_, err = f.Write(data)
if err1 := f.Close(); err1 != nil && err == nil {
err = err1
}
return err
}