Hi Ted, These are the modifications to e2fsprogs in order to support encoding awareness and case folding. This patch series is divided in 3 parts: Patch 1 & 2 work on reserving superblock fields. Patch 1 is actually unrelated, just updating the super_block to resynchronize with the kernel. Patch 2 reserves the feature bit and superblock fields for this feature. Patch 3 through 5 implements the changes the changes to mke2fs and chattr/lsattr to enable the encoding feature at mkfs time and flipping the casefold flag on demand for specific directories. Patch 6 through 9 is where things get a bit ugly. fsck needs to become encoding aware, in order to calculate directory hashes correctly and verify/fix inconsistencies. This requires a tiny bit of plumbing to pass the encoding information up to the point where we calculate the hash, as well as implementing a simple nls-like interface in e2fsprogs to do normalization/casefolding. You'll see that in this series I've actually dropped the utf8 part because that patch is huge and I'd rather discuss it separately. I did it in a hacky way now, where we import the utf8n code from linux. I thought about using libunistring but it doesn't seem to support versioning and we risk being incompatible with the kernel hashes. I think we could follow the kernel approach and make ucd files available in e2fsprogs and generate the data at compilation. What do you think? If you want to see a full utf8 capable version of this series, please clone from: https://gitlab.collabora.com/krisman/e2fsprogs -b encoding-feature-merge If you don't object to patch 1 & 2, can we get them merged before the rest of the series is ready, so I can reserve the bits in the super block for this feature (patch 2) and avoid more rebasing on my side? Thanks, Gabriel Krisman Bertazi (9): e2fsprogs: Add timestamp extension bits to superblock e2fsprogs: Reserve feature bit and SB field bit for filename encoding libe2p: Helpers for configuring the encoding superblock fields mke2fs: Configure encoding during superblock initialization chattr/lsattr: Support casefold attribute lib/ext2fs: Implement NLS support lib/ext2fs: Support encoding when calculating dx hashes debugfs/htree: Support encoding when printing the file hash tune2fs: Prevent enabling encryption flag on encoding-aware fs debugfs/htree.c | 27 +++++++++++---- e2fsck/dx_dirinfo.c | 4 ++- e2fsck/e2fsck.h | 4 ++- e2fsck/pass1.c | 11 ++++-- e2fsck/pass2.c | 7 +++- e2fsck/rehash.c | 12 ++++--- lib/e2p/Makefile.in | 8 +++-- lib/e2p/e2p.h | 4 +++ lib/e2p/encoding.c | 76 +++++++++++++++++++++++++++++++++++++++++ lib/e2p/feature.c | 2 ++ lib/e2p/pf.c | 1 + lib/ext2fs/Makefile.in | 10 ++++-- lib/ext2fs/dirhash.c | 49 +++++++++++++++++++++++--- lib/ext2fs/ext2_fs.h | 31 +++++++++++++++-- lib/ext2fs/ext2fs.h | 6 +++- lib/ext2fs/initialize.c | 4 +++ lib/ext2fs/nls.h | 65 +++++++++++++++++++++++++++++++++++ lib/ext2fs/nls_ascii.c | 48 ++++++++++++++++++++++++++ misc/chattr.c | 3 +- misc/mke2fs.c | 43 +++++++++++++++++++++++ misc/tune2fs.c | 6 ++++ 21 files changed, 393 insertions(+), 28 deletions(-) create mode 100644 lib/e2p/encoding.c create mode 100644 lib/ext2fs/nls.h create mode 100644 lib/ext2fs/nls_ascii.c -- 2.19.1
