From: Shreeya Patel <shreeya.patel@collabora.com>
To: tytso@mit.edu, adilger.kernel@dilger.ca, jaegeuk@kernel.org,
chao@kernel.org, krisman@collabora.com, ebiggers@google.com,
drosen@google.com, ebiggers@kernel.org, yuchao0@huawei.com
Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net,
linux-fsdevel@vger.kernel.org, kernel@collabora.com,
andre.almeida@collabora.com
Subject: [PATCH v5 0/4] Make UTF-8 encoding loadable
Date: Tue, 30 Mar 2021 02:12:36 +0530 [thread overview]
Message-ID: <20210329204240.359184-1-shreeya.patel@collabora.com> (raw)
utf8data.h_shipped has a large database table which is an auto-generated
decodification trie for the unicode normalization functions and it is not
necessary to carry this large table in the kernel.
Goal is to make UTF-8 encoding loadable by converting it into a module
and adding a layer between the filesystems and the utf8 module which will
load the module whenever any filesystem that needs unicode is mounted.
1st patch in the series resolves the warning reported by kernel test
robot by using strscpy instead of strncpy.
Unicode is the subsystem and utf8 is a charachter encoding for the
subsystem, hence 2nd and 3rd patches in the series are renaming functions
and file name to unicode for better understanding the difference between
UTF-8 module and unicode layer.
Last patch in the series adds the layer and utf8 module and also uses
static calls which gives performance benefit when compared to indirect
calls using function pointers.
---
Changes in v5
- Remove patch which adds NULL check in ext4/super.c and f2fs/super.c
before calling unicode_unload().
- Rename global variables and default static call functions for better
understanding
- Make only config UNICODE_UTF8 visible and config UNICODE to be always
enabled provided UNICODE_UTF8 is enabled.
- Improve the documentation for Kconfig
- Improve the commit message.
Changes in v4
- Return error from the static calls instead of doing nothing and
succeeding even without loading the module.
- Remove the complete usage of utf8_ops and use static calls at all
places.
- Restore the static calls to default values when module is unloaded.
- Decrement the reference of module after calling the unload function.
- Remove spinlock as there will be no race conditions after removing
utf8_ops.
Changes in v3
- Add a patch which checks if utf8 is loaded before calling utf8_unload()
in ext4 and f2fs filesystems
- Return error if strscpy() returns value < 0
- Correct the conditions to prevent NULL pointer dereference while
accessing functions via utf8_ops variable.
- Add spinlock to avoid race conditions.
- Use static_call() for preventing speculative execution attacks.
Changes in v2
- Remove the duplicate file from the last patch.
- Make the wrapper functions inline.
- Remove msleep and use try_module_get() and module_put()
for ensuring that module is loaded correctly and also
doesn't get unloaded while in use.
- Resolve the warning reported by kernel test robot.
- Resolve all the checkpatch.pl warnings.
Shreeya Patel (4):
fs: unicode: Use strscpy() instead of strncpy()
fs: unicode: Rename function names from utf8 to unicode
fs: unicode: Rename utf8-core file to unicode-core
fs: unicode: Add utf8 module and a unicode layer
fs/ext4/hash.c | 2 +-
fs/ext4/namei.c | 12 +-
fs/ext4/super.c | 6 +-
fs/f2fs/dir.c | 12 +-
fs/f2fs/super.c | 6 +-
fs/libfs.c | 6 +-
fs/unicode/Kconfig | 17 ++-
fs/unicode/Makefile | 5 +-
fs/unicode/unicode-core.c | 80 +++++++++++++
fs/unicode/{utf8-core.c => unicode-utf8.c} | 90 +++++++++------
fs/unicode/utf8-selftest.c | 8 +-
include/linux/unicode.h | 127 ++++++++++++++++++---
12 files changed, 291 insertions(+), 80 deletions(-)
create mode 100644 fs/unicode/unicode-core.c
rename fs/unicode/{utf8-core.c => unicode-utf8.c} (59%)
--
2.30.1
next reply other threads:[~2021-03-29 20:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-29 20:42 Shreeya Patel [this message]
2021-03-29 20:42 ` [PATCH v5 1/4] fs: unicode: Use strscpy() instead of strncpy() Shreeya Patel
2021-03-29 20:42 ` [PATCH v5 2/4] fs: unicode: Rename function names from utf8 to unicode Shreeya Patel
2021-03-30 1:53 ` Eric Biggers
2021-03-30 9:49 ` Shreeya Patel
2021-03-29 20:42 ` [PATCH v5 3/4] fs: unicode: Rename utf8-core file to unicode-core Shreeya Patel
2021-03-29 20:42 ` [PATCH v5 4/4] fs: unicode: Add utf8 module and a unicode layer Shreeya Patel
2021-03-29 21:20 ` Gabriel Krisman Bertazi
2021-03-29 22:38 ` Shreeya Patel
2021-03-29 23:10 ` Gabriel Krisman Bertazi
2021-03-30 2:01 ` Eric Biggers
2021-03-30 2:16 ` Gabriel Krisman Bertazi
2021-03-30 5:47 ` Eric Biggers
2021-03-30 16:00 ` Theodore Ts'o
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