seaweedfs/weed/filesys/xattr.go
2020-01-15 19:08:54 -08:00

141 lines
2.7 KiB
Go

package filesys
import (
"context"
"path/filepath"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/fuse"
)
func getxattr(entry *filer_pb.Entry, req *fuse.GetxattrRequest, resp *fuse.GetxattrResponse) error {
if entry == nil {
return fuse.ErrNoXattr
}
if entry.Extended == nil {
return fuse.ErrNoXattr
}
data, found := entry.Extended[req.Name]
if !found {
return fuse.ErrNoXattr
}
if req.Position < uint32(len(data)) {
size := req.Size
if req.Position+size >= uint32(len(data)) {
size = uint32(len(data)) - req.Position
}
if size == 0 {
resp.Xattr = data[req.Position:]
} else {
resp.Xattr = data[req.Position : req.Position+size]
}
}
return nil
}
func setxattr(entry *filer_pb.Entry, req *fuse.SetxattrRequest) error {
if entry == nil {
return fuse.EIO
}
if entry.Extended == nil {
entry.Extended = make(map[string][]byte)
}
data, _ := entry.Extended[req.Name]
newData := make([]byte, int(req.Position)+len(req.Xattr))
copy(newData, data)
copy(newData[int(req.Position):], req.Xattr)
entry.Extended[req.Name] = newData
return nil
}
func removexattr(entry *filer_pb.Entry, req *fuse.RemovexattrRequest) error {
if entry == nil {
return fuse.ErrNoXattr
}
if entry.Extended == nil {
return fuse.ErrNoXattr
}
_, found := entry.Extended[req.Name]
if !found {
return fuse.ErrNoXattr
}
delete(entry.Extended, req.Name)
return nil
}
func listxattr(entry *filer_pb.Entry, req *fuse.ListxattrRequest, resp *fuse.ListxattrResponse) error {
if entry == nil {
return fuse.EIO
}
for k := range entry.Extended {
resp.Append(k)
}
size := req.Size
if req.Position+size >= uint32(len(resp.Xattr)) {
size = uint32(len(resp.Xattr)) - req.Position
}
if size == 0 {
resp.Xattr = resp.Xattr[req.Position:]
} else {
resp.Xattr = resp.Xattr[req.Position : req.Position+size]
}
return nil
}
func (wfs *WFS) maybeLoadEntry(ctx context.Context, dir, name string) (entry *filer_pb.Entry, err error) {
fullpath := filepath.Join(dir, name)
item := wfs.listDirectoryEntriesCache.Get(fullpath)
if item != nil && !item.Expired() {
entry = item.Value().(*filer_pb.Entry)
return
}
glog.V(3).Infof("read entry cache miss %s", fullpath)
err = wfs.WithFilerClient(ctx, func(client filer_pb.SeaweedFilerClient) error {
request := &filer_pb.LookupDirectoryEntryRequest{
Name: name,
Directory: dir,
}
resp, err := client.LookupDirectoryEntry(ctx, request)
if err != nil || resp == nil || resp.Entry == nil {
glog.V(3).Infof("file attr read file %v: %v", request, err)
return fuse.ENOENT
}
entry = resp.Entry
wfs.listDirectoryEntriesCache.Set(fullpath, entry, wfs.option.EntryCacheTtl)
return nil
})
return
}