Pavel Volkov posted on Mon, 06 Apr 2015 10:40:03 +0300 as excerpted: > On Sunday, April 5, 2015 1:04:17 PM MSK, Hugo Mills wrote: >> That's these, I think: >> >> #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5) >> #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6) >> >> so it's definitely -O^extref. I don't see where big_metadata comes >> from, though. That's not a -O option. Try with -O^extref and see where >> that gets you. (Also, don't mount the FS on a newer kernel -- it may be >> setting big metadata automatically, although it probably shouldn't do). > > By the way, is there any way to see which options are enabled on a local > filesystem without having to try mounting it with old kernel and > checking dmesg?
btrfs-show-super shows what flags are enabled, both numerically and symbolically. At least for btrfs-progs 3.19.1, which I have installed. I'm not sure how far that goes back, but I don't believe it's new functionality, so I'd guess 3.14 at least, but likely not back all the way to 0.19, as that was a very long time ago in btrfs terms. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
