Hello, Did my last message go through? Just wondering if it was lost ... thanks, Felipe Monteiro de Carvalho On Mon, Aug 12, 2013 at 5:38 PM, Felipe Monteiro de Carvalho <felipemonteiro.carvalho@xxxxxxxxx> wrote: > Hello, > > Thanks to the help here I have essentially finished my ext4 reader =) > At least it can read ext4 filesystems with these features, which is > what I found when using Ubuntu and Mageia LInux: > > EXT4_FEATURE_INCOMPAT_JOURNAL_DEV = $0008; // Journal device */ > EXT4_FEATURE_INCOMPAT_META_BG = $0010; > EXT4_FEATURE_INCOMPAT_EXTENTS = $0040; // extents support */ > EXT4_FEATURE_INCOMPAT_FLEX_BG = $0200; > EXT4_FEATURE_INCOMPAT_64BIT = $0080; > > Some features seam to not require any extra care for my reader: > > EXT4_FEATURE_INCOMPAT_COMPRESSION = $0001; > EXT4_FEATURE_INCOMPAT_FILETYPE = $0002; > EXT4_FEATURE_INCOMPAT_RECOVER = $0004; // Needs recovery */ > EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM= $2000; // use crc32c for bg */ > > But I now wonder about these features: > > EXT4_FEATURE_INCOMPAT_MMP = $0100; > EXT4_FEATURE_INCOMPAT_EA_INODE = $0400; // EA in inode */ > EXT4_FEATURE_INCOMPAT_DIRDATA = $1000; // data in dirent */ > EXT4_FEATURE_INCOMPAT_LARGEDIR = $4000; // >2GB or 3-lvl htree */ > EXT4_FEATURE_INCOMPAT_INLINEDATA = $8000; // data in inode */ > > Could anyone comment how common is the use of those features and if > they are already stable and in production usage (I read that they were > under development in 2011)? > > And also which ones require an active work for a reader application to > implement. As I already found out that FLEX_BG does not require active > work to be supported despite being in the INCOMPAT list... > > From the description I'm pretty sure that at least DIRDATA and > INLINEDATA would require adjustments in my software. But I wonder if > they are already being used and stable, etc, and if it is a good idea > to work on supporting them. > > thanks, =) > -- > Felipe Monteiro de Carvalho -- Felipe Monteiro de Carvalho -- 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
