filesystems

问题 Assume that a btrfs subvol named "child-subvol" is within a another subvol say, "root-subvol" and if we take snapshot of "root-subvol" then, the "child-subvol" should also be taken a snapshot. Since recursive snapshot support is not yet there in btrfs file system, how can this be achieved alternatively ? 回答1: Step 1: Get all the residing btrfs sub-volumes. Preferably in the sorted order as achieved by the command below. $ btrfs subvolume list --sort=-path < top_subvol > Step 2: In the order

问题 Assume that a btrfs subvol named "child-subvol" is within a another subvol say, "root-subvol" and if we take snapshot of "root-subvol" then, the "child-subvol" should also be taken a snapshot. Since recursive snapshot support is not yet there in btrfs file system, how can this be achieved alternatively ? 回答1: Step 1: Get all the residing btrfs sub-volumes. Preferably in the sorted order as achieved by the command below. $ btrfs subvolume list --sort=-path < top_subvol > Step 2: In the order

问题 Assume that a btrfs subvol named "child-subvol" is within a another subvol say, "root-subvol" and if we take snapshot of "root-subvol" then, the "child-subvol" should also be taken a snapshot. Since recursive snapshot support is not yet there in btrfs file system, how can this be achieved alternatively ? 回答1: Step 1: Get all the residing btrfs sub-volumes. Preferably in the sorted order as achieved by the command below. $ btrfs subvolume list --sort=-path < top_subvol > Step 2: In the order

问题 Is it possible to check if a file has been deleted or recreated in python? For example, if you did a open("file") in the script, and then while that file is still open, you do rm file; touch file; , then the script will still hold a reference to the old file even though it's already been deleted. 回答1: Yes. Use the os.stat() function to check the file length. If the length is zero (or the function returns the error "File not found"), then someone deleted the file. Alternatively, you can open

问题 I have a bash script where I want to trigger a method every time the filesystem is changed: #!/bin/bash function run { echo Do some magic // Do some magic } run fswatch . src | 'run' In this case I am watching the src folder. When I trigger the script via ./automater.sh the script executes the run function the first time correctly and when I then change some file, the script simply exits... 回答1: BUT then it runs in a loop.... , I also hit this, because after your ./automater.sh execution,

问题 what i'm trying to do is save (2GB +-) of data for offline use. i do this using Dexie( wrapper for indexeddb) for my Progressive web app. My problem is that i use all of my laptops/android/IOS device's memory(RAM). Is there a way for a progressive web app to save a lor of data without using up all the memory? -localstorage has limits i think and also relies on memory or am i wrong ? -Filesystem API is it possible ? -LargeLocalStorage is it possible ? (https://github.com/tantaman

问题 I am working with some tables that represent a file system, and I need to select the full path of each folder as a flattened string. The first table lists the details of each folder: CREATE TABLE Folders( FolderID int IDENTITY(1,1) NOT NULL, [Name] nvarchar(255) NOT NULL) The second table lists transitive closures of folder relationships: CREATE TABLE FolderClosures( FolderClosuresID int IDENTITY(1,1) NOT NULL, AncestorFolderID int NOT NULL, --Foreign key to Folders.FolderID

问题 We have application on android market, our users getting a lot from this error: java.io.IOException: No space left on device From what I found out so far, I know that they got enough space left on they external storage, and it's only happen on Android 2.x . I had a small research in Linux file system, and I found out that beyond the space limitation there are limitation on number of files in each directory and the total number of files under root directory. But it looks like our app is not

问题 We have application on android market, our users getting a lot from this error: java.io.IOException: No space left on device From what I found out so far, I know that they got enough space left on they external storage, and it's only happen on Android 2.x . I had a small research in Linux file system, and I found out that beyond the space limitation there are limitation on number of files in each directory and the total number of files under root directory. But it looks like our app is not

问题 It is easy to implement a file browser by using QFileSystemModel. But the listview UI is not pretty. So I want to implement a file browser using QML. the QML has model/view support. But how to display the filesystem tree in QML? Any clue would be appreciated. 回答1: Since Qt5.5 we have TreeView QML component available, main.qml : import QtQuick.Controls 1.4 TreeView { anchors.fill: parent TableViewColumn { title: "Name" role: "fileName" width: 300 } model: my_model } main.cpp : QFileSystemModel