These patches are all on top of torvalds/master Ext4 and F2FS currently both support casefolding and encryption, but not at the same time. These patches aim to rectify that. I've left off the Ext4 patches that enable casefolding and ecryption from this revision since they still need some fixups, and I haven't gotten around to the fsck changes yet. I moved the identical casefolding dcache operations for ext4 and f2fs into fs/libfs.c, as all filesystems using casefolded names will want them. I've also adjust fscrypt to not set it's d_revalidate operation during it's prepare lookup, instead having the calling filesystem set it up. This is done to that the filesystem may have it's own dentry_operations. Also added a helper function in libfs.c that will work for filesystems supporting both casefolding and fscrypt. For Ext4, since the hash for encrypted casefolded directory names cannot be computed without the key, we need to store the hash on disk. We only do so for encrypted and casefolded directories to avoid on disk format changes. Previously encryption and casefolding could not be on the same filesystem, and we're relaxing that requirement. F2fs is a bit more straightforward since it already stores hashes on disk. I've updated the related tools with just enough to enable the feature. I still need to adjust ext4's fsck's, although without access to the keys, neither fsck will be able to verify the hashes of casefolded and encrypted names. v8 changes: Fixed issue with non-strict_mode fallback for hashing dentry op Fixed potential RCU/unicode issue in casefolding dentry_ops. Split "fscrypt: Have filesystems handle their d_ops" into a few smaller patches Switched ubifs change to also use the dentry op function added in libfs.c Added hash function in fs/unicode changed super_block s_encoding_flags to u16. Didn't make unsigned int since both filesystems using them use them as 16 bits, and want to avoid possible confusion. Wouldn't really be opposed to that change though Added kernel doc comments misc other small adjustments TODO: Investigate moving to a dentry flag to check for casefolding, or otherwise conditionally setting the casefolding dentry ops as needed, like fscrypt. Currently not done due to some issues with cached negative dentries and toggling casefolding on an empty directory. Ext4 fsck changes/debugging ext4 patches v7 changes: Moved dentry operations from unicode to libfs, added new iterator function to unicode to allow this. Added libfs function for setting dentries to remove code duplication between ext4 and f2fs. v6 changes: Went back to using dentry_operations for casefolding. Provided standard implementations in fs/unicode, avoiding extra allocation in d_hash op. Moved fscrypt d_ops setting to be filesystem's responsibility to maintain compatibility with casefolding and overlayfs if casefolding is not used fixes some f2fs error handling v4-5: patches submitted on fscrypt v3 changes: fscrypt patch only creates hash key if it will be needed. Rebased on top of fscrypt branch, reconstified match functions in ext4/f2fs v2 changes: fscrypt moved to separate thread to rebase on fscrypt dev branch addressed feedback, plus some minor fixes Daniel Rosenberg (8): unicode: Add utf8_casefold_hash fs: Add standard casefolding support f2fs: Use generic casefolding support ext4: Use generic casefolding support fscrypt: Export fscrypt_d_revalidate libfs: Add generic function for setting dentry_ops fscrypt: Have filesystems handle their d_ops f2fs: Handle casefolding with Encryption fs/crypto/fname.c | 7 +- fs/crypto/fscrypt_private.h | 1 - fs/crypto/hooks.c | 1 - fs/ext4/dir.c | 51 ----------- fs/ext4/ext4.h | 16 ---- fs/ext4/hash.c | 2 +- fs/ext4/namei.c | 21 ++--- fs/ext4/super.c | 15 ++-- fs/f2fs/dir.c | 127 +++++++++++----------------- fs/f2fs/f2fs.h | 18 +--- fs/f2fs/hash.c | 27 ++++-- fs/f2fs/inline.c | 9 +- fs/f2fs/namei.c | 1 + fs/f2fs/super.c | 17 ++-- fs/f2fs/sysfs.c | 10 ++- fs/libfs.c | 164 ++++++++++++++++++++++++++++++++++++ fs/ubifs/dir.c | 1 + fs/unicode/utf8-core.c | 23 ++++- include/linux/f2fs_fs.h | 3 - include/linux/fs.h | 24 ++++++ include/linux/fscrypt.h | 6 +- include/linux/unicode.h | 3 + 22 files changed, 321 insertions(+), 226 deletions(-) -- 2.25.1.481.gfbce0eb801-goog
