| From: |
| Chi Zhiling <chizhiling-AT-163.com> |
| To: |
| Namjae Jeon <linkinjeon-AT-kernel.org>, Sungjong Seo <sj1557.seo-AT-samsung.com>, Yuezhang Mo <yuezhang.mo-AT-sony.com> |
| Subject: |
| [PATCH v1 0/6] exfat: unify FAT chain walking helpers |
| Date: |
| Tue, 31 Mar 2026 17:11:07 +0800 |
| Message-ID: |
| <20260331091113.20882-1-chizhiling@163.com> |
| Cc: |
| linux-fsdevel-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, Chi Zhiling <chizhiling-AT-kylinos.cn> |
| Archive-link: |
| Article |
From: Chi Zhiling <chizhiling@kylinos.cn>
This series introduces and uses two new helpers to simplify FAT chain
walking logic across the exfat driver:
1. exfat_fat_walk - walks FAT chain by a given step, handling both
ALLOC_NO_FAT_CHAIN and ALLOC_FAT_CHAIN modes
2. exfat_chain_advance - walks an exfat_chain structure by a given step,
updating both ->dir and ->size fields atomically with proper boundary
checking
These helpers replace open-coded cluster walking logic in dir.c, namei.c
and inode.c, improving code readability and ensuring consistent error
handling for corrupted FAT chains.
Also includes a fix for incorrect directory checksum when renaming a
file to a shorter name.
The base commit is exfat/dev without iomap changes
Chi Zhiling (6):
exfat: fix incorrect directory checksum after rename to shorter name
exfat: introduce exfat_fat_walk helper
exfat: use exfat_fat_walk helper to simplify fat entry walking
exfat: remove NULL cache pointer case in exfat_ent_get
exfat: introduce exfat_chain_advance helper
exfat: use exfat_chain_advance helper
fs/exfat/dir.c | 111 +++++++++-----------------------------------
fs/exfat/exfat_fs.h | 49 ++++++++++++++++++-
fs/exfat/fatent.c | 23 ++++-----
fs/exfat/inode.c | 11 +----
fs/exfat/namei.c | 29 +++---------
5 files changed, 88 insertions(+), 135 deletions(-)
--
2.43.0
