[PATCH v7 00/13] add the latest exfat driver

Namjae Jeon
2019-12-13T05:54:36Z

This adds the latest Samsung exfat driver to fs/exfat. This is an
implementation of the Microsoft exFAT specification. Previous versions
of this shipped with millions of Android phones, and a random previous
snaphot has been merged in drivers/staging/.

Compared to the sdfat driver shipped on the phones the following changes
have been made:

- the support for vfat has been removed as that is already supported
by fs/fat
- driver has been renamed to exfat
- the code has been refactored and clean up to fully integrate into
the upstream Linux version and follow the Linux coding style
- metadata operations like create, lookup and readdir have been further
optimized
- various major and minor bugs have been fixed

We plan to treat this version as the future upstream for the code base
once merged, and all new features and bug fixes will go upstream first.

v7:
- Add the helpers macros for bitmap and fat entry to improve readability.
- Rename exfat_test_bitmap to exfat_find_free_bitmap.
- Merge exfat_get_num_entries into exfat_calc_num_entries.
- Add EXFAT_DATA_CLUSTERS and EXFAT_RESERVED_CLUSTERS macro.
- Add the macros for EXFAT BIOS block(JUMP_BOOT_LEN, OEM_NAME_LEN,
MUST_BE_ZERO_LEN).
- Add the macros for EXFAT entry type (IS_EXFAT_CRITICAL_PRI,
IS_EXFAT_BENIGN_PRI, IS_EXFAT_CRITICAL_SEC).
- Add EXFAT_FILE_NAME_LEN macro.
- Change the data type of is_dir with bool in __exfat_write_inode().
- Change the data type of sync with bool in exfat_set_vol_flags().
- Merge __exfat_set_vol_flags into exfat_set_vol_flags.
- Fix wrong statfs-f_namelen.

v6:
- Fix always false comparison due to limited range of allow_utime's data
type.
- Move bh into loop in exfat_find_dir_entry().
- Move entry_uniname and unichar variables into
an if "entry_type == TYPE_EXTEND" branch.

v5:
- Remove a blank line between the message and the error code in
exfat_load_upcase_table.
- Move brelse to the end of the while loop and rename release_bh label
to free_table in exfat_load_upcase_table.
- Move an error code assignment after a failed function call.
- Rename labels and directly return instead of goto.
- Improve the exception handling in exfat_get_dentry_set().
- Remove ->d_time leftover.
- fix boolreturn.cocci warnings.

v4:
- Declare ALLOC_FAT_CHAIN and ALLOC_NO_FAT_CHAIN macros.
- Rename labels with proper name.
- Remove blank lines.
- Remove pointer check for bh.
- Move ep into loop in exfat_load_bitmap().
- Replace READ/WRITE_ONCE() with test_and_clear_bit() and set_bit().
- Change exfat_allow_set_time return type with bool.

v3:
- fix wrong sbi->s_dirt set.

v2:
- Check the bitmap count up to the total clusters.
- Rename goto labels in several places.
- Change time mode type with enumeration.
- Directly return error instead of goto at first error check.
- Combine seq_printf calls into a single one.

Namjae Jeon (13):
exfat: add in-memory and on-disk structures and headers
exfat: add super block operations
exfat: add inode operations
exfat: add directory operations
exfat: add file operations
exfat: add exfat entry operations
exfat: add bitmap operations
exfat: add exfat cache
exfat: add misc operations
exfat: add nls operations
exfat: add Kconfig and Makefile
exfat: add exfat in fs/Kconfig and fs/Makefile
MAINTAINERS: add exfat filesystem

MAINTAINERS | 7 +
fs/Kconfig | 3 +-
fs/Makefile | 1 +
fs/exfat/Kconfig | 21 +
fs/exfat/Makefile | 8 +
fs/exfat/balloc.c | 282 ++++++++
fs/exfat/cache.c | 325 ++++++++++
fs/exfat/dir.c | 1295 +++++++++++++++++++++++++++++++++++++
fs/exfat/exfat_fs.h | 568 ++++++++++++++++
fs/exfat/exfat_raw.h | 202 ++++++
fs/exfat/fatent.c | 472 ++++++++++++++
fs/exfat/file.c | 343 ++++++++++
fs/exfat/inode.c | 694 ++++++++++++++++++++
fs/exfat/misc.c | 240 +++++++
fs/exfat/namei.c | 1459 ++++++++++++++++++++++++++++++++++++++++++
fs/exfat/nls.c | 808 +++++++++++++++++++++++
fs/exfat/super.c | 732 +++++++++++++++++++++
17 files changed, 7459 insertions(+), 1 deletion(-)
create mode 100644 fs/exfat/Kconfig
create mode 100644 fs/exfat/Makefile
create mode 100644 fs/exfat/balloc.c
create mode 100644 fs/exfat/cache.c
create mode 100644 fs/exfat/dir.c
create mode 100644 fs/exfat/exfat_fs.h
create mode 100644 fs/exfat/exfat_raw.h
create mode 100644 fs/exfat/fatent.c
create mode 100644 fs/exfat/file.c
create mode 100644 fs/exfat/inode.c
create mode 100644 fs/exfat/misc.c
create mode 100644 fs/exfat/namei.c
create mode 100644 fs/exfat/nls.c
create mode 100644 fs/exfat/super.c

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2.17.1