This patch set contains three (independent) bug fixes relating to write operations to root directory. See each commit message for more details.
Without those fixes, you may lose files that you created under root directory or will see the file system corrupted. This will happen particularly when you create (or even delete) many files repeatedly under root directory. (Non-root directory won't be affected.)
I only tested my patches on limited number of file system instances, and hope that other people will also try them.
-Takahiro Akashi
AKASHI Takahiro (4): fs: fat: write to non-cluster-aligned root directory fs: fat: flush a directory cluster properly fs: fat: allocate a new cluster for root directory of fat32 test/py: test_fs: add tests for creating/deleting many files
fs/fat/fat.c | 15 ++-- fs/fat/fat_write.c | 117 +++++++++++++++++++----------- test/py/tests/test_fs/test_ext.py | 84 +++++++++++++++++++++ 3 files changed, 165 insertions(+), 51 deletions(-)