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Diffstat (limited to 'pkg/sentry/fs/ext/ext.go')
-rw-r--r-- | pkg/sentry/fs/ext/ext.go | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/pkg/sentry/fs/ext/ext.go b/pkg/sentry/fs/ext/ext.go deleted file mode 100644 index 7602e2bf0..000000000 --- a/pkg/sentry/fs/ext/ext.go +++ /dev/null @@ -1,49 +0,0 @@ -// Copyright 2019 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Package ext implements readonly ext(2/3/4) filesystems. -package ext - -import ( - "io" - "sync" - - "gvisor.dev/gvisor/pkg/sentry/fs/ext/disklayout" -) - -// Filesystem implements vfs.FilesystemImpl. -type Filesystem struct { - // dev is the ReadSeeker for the underlying fs device and is protected by mu. - dev io.ReadSeeker - - // mu synchronizes the usage of dev. The ext filesystems take locality into - // condsideration, i.e. data blocks of a file will tend to be placed close - // together. On a spinning disk, locality reduces the amount of movement of - // the head hence speeding up IO operations. On an SSD there are no moving - // parts but locality increases the size of each transer request. Hence, - // having mutual exclusion on the read seeker while reading a file *should* - // help in achieving the intended performance gains. - // - // Note: This synchronization was not coupled with the ReadSeeker itself - // because we want to synchronize across read/seek operations for the - // performance gains mentioned above. Helps enforcing one-file-at-a-time IO. - mu sync.Mutex - - // sb represents the filesystem superblock. Immutable after initialization. - sb disklayout.SuperBlock - - // bgs represents all the block group descriptors for the filesystem. - // Immutable after initialization. - bgs []disklayout.BlockGroup -} |