mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-05 03:29:03 +08:00
188 lines
5.1 KiB
Go
188 lines
5.1 KiB
Go
package mount
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import (
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"context"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/hanwen/go-fuse/v2/fuse"
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"syscall"
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"time"
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)
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/**
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* Flush method
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*
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* This is called on each close() of the opened file.
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*
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* Since file descriptors can be duplicated (dup, dup2, fork), for
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* one open call there may be many flush calls.
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*
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* Filesystems shouldn't assume that flush will always be called
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* after some writes, or that if will be called at all.
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*
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* fi->fh will contain the value set by the open method, or will
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* be undefined if the open method didn't set any value.
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*
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* NOTE: the name of the method is misleading, since (unlike
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* fsync) the filesystem is not forced to flush pending writes.
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* One reason to flush data is if the filesystem wants to return
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* write errors during close. However, such use is non-portable
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* because POSIX does not require [close] to wait for delayed I/O to
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* complete.
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*
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* If the filesystem supports file locking operations (setlk,
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* getlk) it should remove all locks belonging to 'fi->owner'.
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*
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* If this request is answered with an error code of ENOSYS,
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* this is treated as success and future calls to flush() will
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* succeed automatically without being send to the filesystem
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* process.
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*
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* Valid replies:
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* fuse_reply_err
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*
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* @param req request handle
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* @param ino the inode number
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* @param fi file information
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*
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* [close]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html
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*/
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func (wfs *WFS) Flush(cancel <-chan struct{}, in *fuse.FlushIn) fuse.Status {
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fh := wfs.GetHandle(FileHandleId(in.Fh))
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if fh == nil {
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return fuse.ENOENT
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}
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fh.Lock()
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defer fh.Unlock()
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return wfs.doFlush(fh, in.Uid, in.Gid)
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}
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/**
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* Synchronize file contents
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*
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* If the datasync parameter is non-zero, then only the user data
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* should be flushed, not the meta data.
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*
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* If this request is answered with an error code of ENOSYS,
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* this is treated as success and future calls to fsync() will
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* succeed automatically without being send to the filesystem
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* process.
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*
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* Valid replies:
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* fuse_reply_err
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*
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* @param req request handle
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* @param ino the inode number
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* @param datasync flag indicating if only data should be flushed
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* @param fi file information
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*/
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func (wfs *WFS) Fsync(cancel <-chan struct{}, in *fuse.FsyncIn) (code fuse.Status) {
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fh := wfs.GetHandle(FileHandleId(in.Fh))
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if fh == nil {
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return fuse.ENOENT
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}
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fh.Lock()
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defer fh.Unlock()
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return wfs.doFlush(fh, in.Uid, in.Gid)
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}
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func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
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// flush works at fh level
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fileFullPath := fh.FullPath()
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dir, name := fileFullPath.DirAndName()
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// send the data to the OS
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glog.V(4).Infof("doFlush %s fh %d", fileFullPath, fh.handle)
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if !wfs.IsOverQuota {
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if err := fh.dirtyPages.FlushData(); err != nil {
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glog.Errorf("%v doFlush: %v", fileFullPath, err)
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return fuse.EIO
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}
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}
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if !fh.dirtyMetadata {
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return fuse.OK
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}
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if wfs.IsOverQuota {
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return fuse.Status(syscall.ENOSPC)
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}
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err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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entry := fh.entry
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if entry == nil {
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return nil
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}
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entry.Name = name // this flush may be just after a rename operation
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if entry.Attributes != nil {
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entry.Attributes.Mime = fh.contentType
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if entry.Attributes.Uid == 0 {
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entry.Attributes.Uid = uid
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}
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if entry.Attributes.Gid == 0 {
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entry.Attributes.Gid = gid
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}
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if entry.Attributes.Crtime == 0 {
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entry.Attributes.Crtime = time.Now().Unix()
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}
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entry.Attributes.Mtime = time.Now().Unix()
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entry.Attributes.Collection, entry.Attributes.Replication = fh.dirtyPages.GetStorageOptions()
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}
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request := &filer_pb.CreateEntryRequest{
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Directory: string(dir),
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Entry: entry,
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Signatures: []int32{wfs.signature},
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SkipCheckParentDirectory: true,
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}
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glog.V(4).Infof("%s set chunks: %v", fileFullPath, len(entry.Chunks))
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for i, chunk := range entry.Chunks {
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glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fileFullPath, i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
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}
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manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(entry.Chunks)
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chunks, _ := filer.CompactFileChunks(wfs.LookupFn(), nonManifestChunks)
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chunks, manifestErr := filer.MaybeManifestize(wfs.saveDataAsChunk(fileFullPath), chunks)
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if manifestErr != nil {
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// not good, but should be ok
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glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
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}
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entry.Chunks = append(chunks, manifestChunks...)
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wfs.mapPbIdFromLocalToFiler(request.Entry)
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defer wfs.mapPbIdFromFilerToLocal(request.Entry)
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if err := filer_pb.CreateEntry(client, request); err != nil {
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glog.Errorf("fh flush create %s: %v", fileFullPath, err)
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return fmt.Errorf("fh flush create %s: %v", fileFullPath, err)
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}
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wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
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return nil
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})
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if err == nil {
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fh.dirtyMetadata = false
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}
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if err != nil {
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glog.Errorf("%v fh %d flush: %v", fileFullPath, fh.handle, err)
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return fuse.EIO
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}
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return fuse.OK
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}
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