mirror of
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104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
// Copyright 2019 the Go-FUSE Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fs
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import (
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"context"
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"sync"
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"syscall"
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"github.com/hanwen/go-fuse/v2/fuse"
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)
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// MemRegularFile is a filesystem node that holds a read-only data
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// slice in memory.
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type MemRegularFile struct {
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Inode
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mu sync.Mutex
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Data []byte
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Attr fuse.Attr
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}
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var _ = (NodeOpener)((*MemRegularFile)(nil))
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var _ = (NodeReader)((*MemRegularFile)(nil))
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var _ = (NodeWriter)((*MemRegularFile)(nil))
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var _ = (NodeSetattrer)((*MemRegularFile)(nil))
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var _ = (NodeFlusher)((*MemRegularFile)(nil))
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func (f *MemRegularFile) Open(ctx context.Context, flags uint32) (fh FileHandle, fuseFlags uint32, errno syscall.Errno) {
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return nil, fuse.FOPEN_KEEP_CACHE, OK
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}
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func (f *MemRegularFile) Write(ctx context.Context, fh FileHandle, data []byte, off int64) (uint32, syscall.Errno) {
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f.mu.Lock()
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defer f.mu.Unlock()
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end := int64(len(data)) + off
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if int64(len(f.Data)) < end {
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n := make([]byte, end)
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copy(n, f.Data)
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f.Data = n
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}
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copy(f.Data[off:off+int64(len(data))], data)
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return uint32(len(data)), 0
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}
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var _ = (NodeGetattrer)((*MemRegularFile)(nil))
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func (f *MemRegularFile) Getattr(ctx context.Context, fh FileHandle, out *fuse.AttrOut) syscall.Errno {
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f.mu.Lock()
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defer f.mu.Unlock()
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out.Attr = f.Attr
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out.Attr.Size = uint64(len(f.Data))
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return OK
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}
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func (f *MemRegularFile) Setattr(ctx context.Context, fh FileHandle, in *fuse.SetAttrIn, out *fuse.AttrOut) syscall.Errno {
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f.mu.Lock()
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defer f.mu.Unlock()
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if sz, ok := in.GetSize(); ok {
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f.Data = f.Data[:sz]
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}
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out.Attr = f.Attr
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out.Size = uint64(len(f.Data))
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return OK
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}
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func (f *MemRegularFile) Flush(ctx context.Context, fh FileHandle) syscall.Errno {
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return 0
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}
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func (f *MemRegularFile) Read(ctx context.Context, fh FileHandle, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
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f.mu.Lock()
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defer f.mu.Unlock()
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end := int(off) + len(dest)
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if end > len(f.Data) {
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end = len(f.Data)
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}
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return fuse.ReadResultData(f.Data[off:end]), OK
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}
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// MemSymlink is an inode holding a symlink in memory.
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type MemSymlink struct {
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Inode
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Attr fuse.Attr
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Data []byte
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}
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var _ = (NodeReadlinker)((*MemSymlink)(nil))
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func (l *MemSymlink) Readlink(ctx context.Context) ([]byte, syscall.Errno) {
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return l.Data, OK
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}
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var _ = (NodeGetattrer)((*MemSymlink)(nil))
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func (l *MemSymlink) Getattr(ctx context.Context, fh FileHandle, out *fuse.AttrOut) syscall.Errno {
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out.Attr = l.Attr
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return OK
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}
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