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Message-Id: <20180815194811.9423-1-krisman@collabora.co.uk>
Date: Wed, 15 Aug 2018 15:47:46 -0400
From: Gabriel Krisman Bertazi <krisman@...labora.co.uk>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org, kernel@...labora.com,
Gabriel Krisman Bertazi <krisman@...labora.co.uk>
Subject: [PATCH v2 00/25] Ext4 Encoding and Case-insensitive support
Hi Ted,
This patchset implements encoding support as a superblock feature, valid
for the entire disk, and Case-insensitive lookups support as a
per-directory feature, configured as an inode flag. Alongside the
addition of the casefolding patch, which was not part of v1, I fixed
some bugs and addressed the concerns raised regarding invalid sequences
and what normalization we use.
My approach to solve the two problems above is to make things more
flexible. An encoding flags field in the superblock registers what kind
of normalization is used by the filesystem. Right now, the only
encoding supported for utf8 is NFKD, for instance, but if we want to
support a different normalization function in the future, we can be
backward compatible. Likewise, superblock flags also define the
behavior when dealing with invalid sequences. The default behavior is
to just treat invalid sequences as opaque byte sequences, falling back
to the original behavior. Alternatively if the strict flag is enabled,
the kernel will reject invalid sequences as soon as they are detected.
All these flags, can only be set at mkfs time, using the encoding_flags
parameter.
Each encoding has its default flags, when creating the filesystem in
mkfs, regarding normalization/casefold functions and how to deal with
opaque sequences.
The NLS patches implement generic casefold and normalization operation
(defined as tolower() and identity(), respectively), allowing us to use
any NLS charset in the kernel. We store the NLS charset as a magic
number in the superblock, and for that only a few charsets are defined.
If you want to force a different charset, the encoding and
encoding_flags mount options are also provided.
This patchset also includes the NLS changes that I am proposing,
including the entire utf8 normalization implementation. Differently
from the previous version, I merged utf8 and utf8n, allowing the user to
request a specific normalization (or no normalization at all) using the
flags. As usual, I did not include the source ucd files because they
would bounce in the list, but a completely functional implementation can
be found at:
https://gitlab.collabora.com/krisman/linux.git -b ext4-ci-directory
I am also not supporting encoding with encrypted directories, given the
cost of searching encrypted directories where the diggested name is not
normalized. This means that we need to decrypt each filename beforehand,
so I decided to simply skip this for now. If the user tries to mount
with encoding a directory that has the encryption feature, we simply
bail out saying it is not supported.
The patchset survives without failures the smoke tests of xfstests, with
the obvious exception of generic/453. This test, which verifies that
multiple files having similar names (which would match in utf8
normalization) are not the same file, doesn't really make sense with
this patchset, since it verifies the fs is *not* encoding aware.
We also developed encoding and casefolding tests for xfstests, allowing
us to quickly verify the implementation. I will be sumitting them
upstream too, but for now they are available at:
https://gitlab.collabora.com/krisman/xfstests.git -b encoding
These tests validate the usage on inline dirs, on dx directories, when
dealing with dcache and more. I am happy with the coverage we have now,
but if you have specific concerns I can add more tests.
A modified version of e2fsprogs is necessary to run the tests, and to
enable the feature. Support for mkfs, fsck, lsattr, chattr is
available. I also hacked tune2fs to prevent it from setting the
encryption flag when encoding is enabled. This tune2fs change is
temporary until we are able to support these two features together.
https://gitlab.collabora.com/krisman/e2fsprogs.git -b encoding-feature
Gabriel Krisman Bertazi (21):
nls: Wrap uni2char/char2uni callers
nls: Wrap charset field access
nls: Wrap charset hooks in ops structure
nls: Split default charset from NLS core
nls: Split struct nls_charset from struct nls_table
nls: Add support for multiple versions of an encoding
nls: Implement NLS_STRICT_MODE flag
nls: Let charsets define the behavior of tolower/toupper
nls: Add new interface for string comparisons
nls: Add optional normalization and casefold hooks
nls: ascii: Support validation and normalization operations
nls: utf8: Move nls-utf8{,-core}.c
nls: utf8: Integrate utf8 normalization code with utf8 charset
nls: utf8: Introduce test module for normalized utf8 implementation
vfs: Handle case-exact lookup in d_add_ci
ext4: Include encoding information in the superblock
ext4: Add encoding mount options
ext4: Support encoding-aware file name lookups
ext4: Implement encoding-aware dcache hooks
ext4: Implement EXT4_CASEFOLD_FL flag
docs: ext4.txt: Document encoding and case-insensitive lookups
Olaf Weber (4):
nls: utf8n: Add unicode character database files
scripts: add trie generator for UTF-8
nls: utf8: Introduce code for UTF-8 normalization
nls: utf8n: reduce the size of utf8data[]
Documentation/filesystems/ext4.txt | 37 +
fs/befs/linuxvfs.c | 8 +-
fs/cifs/cifs_unicode.c | 15 +-
fs/cifs/cifsfs.c | 2 +-
fs/cifs/connect.c | 2 +-
fs/cifs/dir.c | 7 +-
fs/dcache.c | 33 +-
fs/ext4/dir.c | 58 +
fs/ext4/ext4.h | 33 +-
fs/ext4/hash.c | 37 +-
fs/ext4/ialloc.c | 2 +-
fs/ext4/inline.c | 2 +-
fs/ext4/inode.c | 4 +-
fs/ext4/ioctl.c | 18 +
fs/ext4/namei.c | 99 +-
fs/ext4/super.c | 170 ++
fs/fat/dir.c | 13 +-
fs/fat/inode.c | 6 +-
fs/fat/namei_vfat.c | 6 +-
fs/hfs/super.c | 6 +-
fs/hfs/trans.c | 9 +-
fs/hfsplus/options.c | 2 +-
fs/hfsplus/unicode.c | 6 +-
fs/isofs/inode.c | 5 +-
fs/isofs/joliet.c | 3 +-
fs/jfs/jfs_unicode.c | 9 +-
fs/jfs/super.c | 3 +-
fs/nls/Kconfig | 15 +
fs/nls/Makefile | 20 +
fs/nls/mac-celtic.c | 34 +-
fs/nls/mac-centeuro.c | 34 +-
fs/nls/mac-croatian.c | 34 +-
fs/nls/mac-cyrillic.c | 34 +-
fs/nls/mac-gaelic.c | 34 +-
fs/nls/mac-greek.c | 34 +-
fs/nls/mac-iceland.c | 34 +-
fs/nls/mac-inuit.c | 34 +-
fs/nls/mac-roman.c | 34 +-
fs/nls/mac-romanian.c | 34 +-
fs/nls/mac-turkish.c | 34 +-
fs/nls/nls_ascii.c | 84 +-
fs/nls/nls_core.c | 163 ++
fs/nls/nls_cp1250.c | 34 +-
fs/nls/nls_cp1251.c | 34 +-
fs/nls/nls_cp1255.c | 36 +-
fs/nls/nls_cp437.c | 34 +-
fs/nls/nls_cp737.c | 34 +-
fs/nls/nls_cp775.c | 34 +-
fs/nls/nls_cp850.c | 34 +-
fs/nls/nls_cp852.c | 34 +-
fs/nls/nls_cp855.c | 34 +-
fs/nls/nls_cp857.c | 34 +-
fs/nls/nls_cp860.c | 34 +-
fs/nls/nls_cp861.c | 34 +-
fs/nls/nls_cp862.c | 34 +-
fs/nls/nls_cp863.c | 34 +-
fs/nls/nls_cp864.c | 34 +-
fs/nls/nls_cp865.c | 34 +-
fs/nls/nls_cp866.c | 34 +-
fs/nls/nls_cp869.c | 34 +-
fs/nls/nls_cp874.c | 36 +-
fs/nls/nls_cp932.c | 36 +-
fs/nls/nls_cp936.c | 36 +-
fs/nls/nls_cp949.c | 36 +-
fs/nls/nls_cp950.c | 36 +-
fs/nls/{nls_base.c => nls_default.c} | 124 +-
fs/nls/nls_euc-jp.c | 29 +-
fs/nls/nls_iso8859-1.c | 34 +-
fs/nls/nls_iso8859-13.c | 34 +-
fs/nls/nls_iso8859-14.c | 34 +-
fs/nls/nls_iso8859-15.c | 34 +-
fs/nls/nls_iso8859-2.c | 34 +-
fs/nls/nls_iso8859-3.c | 34 +-
fs/nls/nls_iso8859-4.c | 34 +-
fs/nls/nls_iso8859-5.c | 34 +-
fs/nls/nls_iso8859-6.c | 34 +-
fs/nls/nls_iso8859-7.c | 34 +-
fs/nls/nls_iso8859-9.c | 34 +-
fs/nls/nls_koi8-r.c | 34 +-
fs/nls/nls_koi8-ru.c | 30 +-
fs/nls/nls_koi8-u.c | 34 +-
fs/nls/nls_utf8-core.c | 333 +++
fs/nls/nls_utf8-norm.c | 797 ++++++
fs/nls/nls_utf8-selftest.c | 307 +++
fs/nls/nls_utf8.c | 67 -
fs/nls/ucd/README | 33 +
fs/nls/utf8n.h | 117 +
fs/ntfs/inode.c | 2 +-
fs/ntfs/super.c | 6 +-
fs/ntfs/unistr.c | 13 +-
fs/udf/super.c | 3 +-
fs/udf/unicode.c | 4 +-
include/linux/fs.h | 2 +
include/linux/nls.h | 293 ++-
scripts/Makefile | 1 +
scripts/mkutf8data.c | 3464 ++++++++++++++++++++++++++
96 files changed, 7479 insertions(+), 633 deletions(-)
create mode 100644 fs/nls/nls_core.c
rename fs/nls/{nls_base.c => nls_default.c} (89%)
create mode 100644 fs/nls/nls_utf8-core.c
create mode 100644 fs/nls/nls_utf8-norm.c
create mode 100644 fs/nls/nls_utf8-selftest.c
delete mode 100644 fs/nls/nls_utf8.c
create mode 100644 fs/nls/ucd/README
create mode 100644 fs/nls/utf8n.h
create mode 100644 scripts/mkutf8data.c
--
2.18.0
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