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ext: Add ext2 and ext3 tiny images. 

PiperOrigin-RevId: 259657917
This commit is contained in:
Ayush Ranjan 2019-07-23 18:59:55 -07:00 committed by gVisor bot
parent bd7708956f
commit d7bb79b6f1
4 changed files with 18 additions and 9 deletions
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24
pkg/sentry/fs/ext/assets/README.md
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@ -1,19 +1,21 @@
### Tiny Ext4 Image
### Tiny Ext(2/3/4) Images
The image is of size 64Kb which supports 64 1k blocks and 16 inodes. This is the
smallest size mkfs.ext4 works with.
The images are of size 64Kb which supports 64 1k blocks and 16 inodes. This is
the smallest size mkfs.ext(2/3/4) works with.
This image was generated using the following commands.
These images were generated using the following commands.
```bash
fallocate -l 64K tiny.ext4
mkfs.ext4 -j tiny.ext4
fallocate -l 64K tiny.ext$VERSION
mkfs.ext$VERSION -j tiny.ext$VERSION
```
where `VERSION` is `2`, `3` or `4`.
You can mount it using:
```bash
sudo mount -o loop tiny.ext4 $MOUNTPOINT
sudo mount -o loop tiny.ext$VERSION $MOUNTPOINT
```
`file.txt`, `bigfile.txt` and `symlink.txt` were added to this image by just
@ -21,8 +23,14 @@ mounting it and copying (while preserving links) those files to the mountpoint
directory using:
```bash
sudo cp -P {file.txt,symlink.txt,bigfile.txt} $MOUNTPOINT/
sudo cp -P {file.txt,symlink.txt,bigfile.txt} $MOUNTPOINT
```
The files in this directory mirror the contents and organisation of the files
stored in the image.
You can umount the filesystem using:
```bash
sudo umount $MOUNTPOINT
```

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3
pkg/sentry/fs/ext/extent_test.go
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@ -145,7 +145,8 @@ func TestExtentTree(t *testing.T) {
t.Fatalf("inode.buildExtTree failed: %v", err)
}
if diff := cmp.Diff(&mockInode.root, node0, cmpopts.IgnoreUnexported(disklayout.ExtentNode{})); diff != "" {
opt := cmpopts.IgnoreUnexported(disklayout.ExtentIdx{}, disklayout.ExtentHeader{})
if diff := cmp.Diff(&mockInode.root, node0, opt); diff != "" {
t.Errorf("extent tree mismatch (-want +got):\n%s", diff)
}
}