seaweedfs/weed/mount/weedfs_file_sync.go
2022-12-04 23:33:05 -08:00

187 lines
5.2 KiB
Go

package mount
import (
"context"
"fmt"
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/seaweedfs/seaweedfs/weed/filer"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"syscall"
"time"
)
/**
* Flush method
*
* This is called on each close() of the opened file.
*
* Since file descriptors can be duplicated (dup, dup2, fork), for
* one open call there may be many flush calls.
*
* Filesystems shouldn't assume that flush will always be called
* after some writes, or that if will be called at all.
*
* fi->fh will contain the value set by the open method, or will
* be undefined if the open method didn't set any value.
*
* NOTE: the name of the method is misleading, since (unlike
* fsync) the filesystem is not forced to flush pending writes.
* One reason to flush data is if the filesystem wants to return
* write errors during close. However, such use is non-portable
* because POSIX does not require [close] to wait for delayed I/O to
* complete.
*
* If the filesystem supports file locking operations (setlk,
* getlk) it should remove all locks belonging to 'fi->owner'.
*
* If this request is answered with an error code of ENOSYS,
* this is treated as success and future calls to flush() will
* succeed automatically without being send to the filesystem
* process.
*
* Valid replies:
* fuse_reply_err
*
* @param req request handle
* @param ino the inode number
* @param fi file information
*
* [close]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html
*/
func (wfs *WFS) Flush(cancel <-chan struct{}, in *fuse.FlushIn) fuse.Status {
fh := wfs.GetHandle(FileHandleId(in.Fh))
if fh == nil {
return fuse.ENOENT
}
fh.orderedMutex.Acquire(context.Background(), 1)
defer fh.orderedMutex.Release(1)
return wfs.doFlush(fh, in.Uid, in.Gid)
}
/**
* Synchronize file contents
*
* If the datasync parameter is non-zero, then only the user data
* should be flushed, not the meta data.
*
* If this request is answered with an error code of ENOSYS,
* this is treated as success and future calls to fsync() will
* succeed automatically without being send to the filesystem
* process.
*
* Valid replies:
* fuse_reply_err
*
* @param req request handle
* @param ino the inode number
* @param datasync flag indicating if only data should be flushed
* @param fi file information
*/
func (wfs *WFS) Fsync(cancel <-chan struct{}, in *fuse.FsyncIn) (code fuse.Status) {
fh := wfs.GetHandle(FileHandleId(in.Fh))
if fh == nil {
return fuse.ENOENT
}
fh.orderedMutex.Acquire(context.Background(), 1)
defer fh.orderedMutex.Release(1)
return wfs.doFlush(fh, in.Uid, in.Gid)
}
func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
// flush works at fh level
fileFullPath := fh.FullPath()
dir, name := fileFullPath.DirAndName()
// send the data to the OS
glog.V(4).Infof("doFlush %s fh %d", fileFullPath, fh.handle)
if !wfs.IsOverQuota {
if err := fh.dirtyPages.FlushData(); err != nil {
glog.Errorf("%v doFlush: %v", fileFullPath, err)
return fuse.EIO
}
}
if !fh.dirtyMetadata {
return fuse.OK
}
if wfs.IsOverQuota {
return fuse.Status(syscall.ENOSPC)
}
err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
entry := fh.GetEntry()
if entry == nil {
return nil
}
entry.Name = name // this flush may be just after a rename operation
if entry.Attributes != nil {
entry.Attributes.Mime = fh.contentType
if entry.Attributes.Uid == 0 {
entry.Attributes.Uid = uid
}
if entry.Attributes.Gid == 0 {
entry.Attributes.Gid = gid
}
if entry.Attributes.Crtime == 0 {
entry.Attributes.Crtime = time.Now().Unix()
}
entry.Attributes.Mtime = time.Now().Unix()
}
request := &filer_pb.CreateEntryRequest{
Directory: string(dir),
Entry: entry,
Signatures: []int32{wfs.signature},
SkipCheckParentDirectory: true,
}
glog.V(4).Infof("%s set chunks: %v", fileFullPath, len(entry.GetChunks()))
for i, chunk := range entry.GetChunks() {
glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fileFullPath, i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
}
manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(entry.GetChunks())
chunks, _ := filer.CompactFileChunks(wfs.LookupFn(), nonManifestChunks)
chunks, manifestErr := filer.MaybeManifestize(wfs.saveDataAsChunk(fileFullPath), chunks)
if manifestErr != nil {
// not good, but should be ok
glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
}
entry.Chunks = append(chunks, manifestChunks...)
wfs.mapPbIdFromLocalToFiler(request.Entry)
defer wfs.mapPbIdFromFilerToLocal(request.Entry)
if err := filer_pb.CreateEntry(client, request); err != nil {
glog.Errorf("fh flush create %s: %v", fileFullPath, err)
return fmt.Errorf("fh flush create %s: %v", fileFullPath, err)
}
wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
return nil
})
if err == nil {
fh.dirtyMetadata = false
}
if err != nil {
glog.Errorf("%v fh %d flush: %v", fileFullPath, fh.handle, err)
return fuse.EIO
}
return fuse.OK
}