Persistent ghosts - leakage of storage files.

Hi people,

I worked through a somewhat worrisome question lately: If you QFile.remove () a file that MediaPlayer plays or MediaPlayer.pause () or more recently MediaPlayer.stop () would be the file is deleted, but the disk taken up by the file storage to become available - never.

The first time I came across this, I was perplexed: the total file storage to SD card used and free storage space don't add to the capacity of the card and there is no way to recover the lost space other than formatting the drive.

I have also confirmed that it is not a thing of file system, but can also occur on the QNX6 file on the storage of the phone system. What happens when the phone storage is filled with ghosts files? You must do a security wipe!

There seems to be two issues here:

1. There is an easy way to remove the placeholder for the file in the file system that is not giving up the space used. (which can lead to the need to reformat your phone/card) I guess it can be considered a storage leak.

2. There is no obvious way deleting a file that has been recently buffered in the MediaPlayer.

Here is the output of command line I captured when the file _wasn't_ play:

$ ls-l
Total 105107
-rw-rw-rw-1 devuser 1000_shared 53814712 Feb 08 19:23 sn0441.mp3
$ df - kP.
1024 - filesystem blocks used available capacity mounted on
/ dev/EMMC/user0 13826032 9625376 4200656 70%.
$ df - kP.
1024 - filesystem blocks used available capacity mounted on
/ dev/EMMC/user0 13826032 9572792 4253240 70%.

You can see that 9625376-9572792 = 52584 k, is about the size of the file.

If I do the same thing with a file that is at stake:

$ df - kP.
1024 - filesystem blocks used available capacity mounted on
/ dev/EMMC/user0 13826032 9625408 4200624 70%.

$ ls-l
Total 222732
-rw-rw-rw-1 devuser 1000_shared 60223698 Feb 08 19:17 sn0438.mp3
-rw-rw-rw-1 devuser 1000_shared 53814712 Feb 08 19:23 sn0441.mp3

> File is deleted the app here.

$ ls-l
Total 105107
-rw-rw-rw-1 devuser 1000_shared 53814712 Feb 08 19:23 sn0441.mp3
$ df - kP.
1024 - filesystem blocks used available capacity mounted on
/ dev/EMMC/user0 13826032 9625376 4200656 70%.

9625408 - 9625376 is 32 k. ot anywhere near 96 MB.

I can also confirm that this issue has been observed on the 10.0 and 10.1, 10.2.1.

Has anyone else seen anything like this? I'd certainly appreciate advice on how to remove a file that has been recently used by the MediaPlayer.

See you soon,.

Eric

Here's the response of the people of file system.  Hope this helps clear things upwards!

By POSIX behavior, content of the file must not be released until all open in the file handles are released.  If we cannot free up space (stop for example), we will reclaim the space during startup for QNX6 file system.
 
In the FAT formats, it's different because the file system has no concepts such as the names and the POSIX inode.  Emulate us the behavior in our implementation, but the lack of security features power means that it is possible to lose this space if the media is removed or system power off with the open file handles.  You can use the mass storage mode or place the card in a BONE to fill a control and correction of the host system.

Tags: BlackBerry Developers

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