On Fri, Aug 12, 2011 at 06:42:57PM +0200, Lukas Czerner wrote: > If e2fsprogs tools (mke2fs, e2fsck) is run on regular file instead of > on block device, we can use punch hole instead of regular discard > command which would not work on regular file anyway. This gives us > several advantages. First of all when e2fsck is run with '-E discard' > parameter it will punch out all ununsed space from the image, hence > trimming down the file system image. And secondly, when creating an > file system on regular file (with '-E discard' which is default), we > can use punch hole to clear the file content, hence we can skip inode > table initialization, because reads from sparse area returns zeros. This > will result in faster file system creation (without the need to specify > lazy_itable_init) and smaller images. > > This commit also fixes some tests that would fail due to mke2fs showing > discard progress, hence the output would differ. > > Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx> Applied to the next branch, thanks. (I combined the following patch which added the configure.in test for linux/falloc.h, since it's needed by this patch.) - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
