On 2011-04-09, at 3:50 PM, Santiago Garcia Mantinan <manty@xxxxxxxxx> wrote: > I had converted an ext3 filesystem to ext4 long ago but comparing it's > features with the ones found on a newly formatted ext4 filesystem I found > that I had these features missing: > flex_bg huge_file dir_nlink extra_isize > Current doc at ext4.wiki.kernel.org says: "There are additional ext4 > features, such as flex_bg and > 16TB filesystem support that can only > be enabled at format time via mke2fs." > > I did activate all these 4 without any problem (2.6.38 with 1.41.12 > e2fsprogs) is the doc old and doesn't reflect that this is now possible? > > Or have I done something I'll regret? Technically, flex_bg can be activated after the filesystem is formatted, but it doesn't actually provide the benefit as if enabled at format time. The dir_nlink and huge_file features can safely be enabled on an existing filesystem, allowing > 64000 subdirs and > 2 TB files, respectively. The extra_isize feature will not itself do anything if the filesystem wasn't formatted with large inodes (>128 bytes), though it is possible this was done even for ext3, depending on the version of e2fsprogs used. > So far the filesystem seems ok (e2fsck doesn't detect any problems) and > files seem ok as well. -- 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
