Added a buffer field.
parent
ca4f55538f
commit
b8110bf8a7
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@ -16,16 +16,34 @@ package buffer
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import (
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import (
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"errors"
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"errors"
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"fmt"
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"io"
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"io"
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"syscall"
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"unsafe"
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"unsafe"
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"github.com/jacobsa/fuse/internal/fusekernel"
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"github.com/jacobsa/fuse/internal/fusekernel"
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)
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)
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// All requests read from the kernel, without data, are shorter than
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// this.
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const pageSize = 4096
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func init() {
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// Confirm the page size.
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if syscall.Getpagesize() != pageSize {
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panic(fmt.Sprintf("Page size is unexpectedly %d", syscall.Getpagesize()))
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}
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}
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// We size the buffer to have enough room for a fuse request plus data
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// associated with a write request.
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const bufSize = pageSize + MaxWriteSize
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// An incoming message from the kernel, including leading fusekernel.InHeader
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// An incoming message from the kernel, including leading fusekernel.InHeader
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// struct. Provides storage for messages and convenient access to their
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// struct. Provides storage for messages and convenient access to their
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// contents.
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// contents.
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type InMessage struct {
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type InMessage struct {
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buf [bufSize]byte
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}
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}
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// Initialize with the data read by a single call to r.Read. The first call to
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// Initialize with the data read by a single call to r.Read. The first call to
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@ -0,0 +1,20 @@
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package buffer
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// The maximum fuse write request size that InMessage can acommodate.
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//
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// Experimentally, OS X appears to cap the size of writes to 1 MiB.
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const MaxWriteSize = 1 << 20
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