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Filename Latest commit message Latest commit date
Hyeongseok Kim 898b0ec688 exfat: improve performance of exfat_free_cluster when using dirsync mount option 
There are stressful update of cluster allocation bitmap when using
dirsync mount option which is doing sync buffer on every cluster bit
clearing. This could result in performance degradation when deleting
big size file.
Fix to update only when the bitmap buffer index is changed would make
less disk access, improving performance especially for truncate operation.

Testing with Samsung 256GB sdcard, mounted with dirsync option
(mount -t exfat /dev/block/mmcblk0p1 /temp/mount -o dirsync)

Remove 4GB file, blktrace result.
[Before] : 39 secs.
Total (blktrace):
 Reads Queued:      0,        0KiB   Writes Queued:      32775,    16387KiB
 Read Dispatches:   0,        0KiB   Write Dispatches:   32775,    16387KiB
 Reads Requeued:    0                Writes Requeued:        0
 Reads Completed:   0,        0KiB   Writes Completed:   32775,    16387KiB
 Read Merges:       0,        0KiB   Write Merges:           0,        0KiB
 IO unplugs:        2                Timer unplugs:          0

[After] : 1 sec.
Total (blktrace):
 Reads Queued:      0,        0KiB   Writes Queued:         13,        6KiB
 Read Dispatches:   0,        0KiB   Write Dispatches:      13,        6KiB
 Reads Requeued:    0                Writes Requeued:        0
 Reads Completed:   0,        0KiB   Writes Completed:      13,        6KiB
 Read Merges:       0,        0KiB   Write Merges:           0,        0KiB
 IO unplugs:        1                Timer unplugs:          0

Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com>
Acked-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2021-02-01 10:33:25 +09:00
.travis.yml
.travis_cmd_wrapper.pl
.travis_get_mainline_kernel
balloc.c exfat: improve performance of exfat_free_cluster when using dirsync mount option 2021-02-01 10:33:25 +09:00
cache.c exfat: fix use of uninitialized spinlock on error path 2020-10-12 22:56:52 +09:00
dir.c
exfat_fs.h exfat: improve performance of exfat_free_cluster when using dirsync mount option 2021-02-01 10:33:25 +09:00
exfat_raw.h
fatent.c exfat: improve performance of exfat_free_cluster when using dirsync mount option 2021-02-01 10:33:25 +09:00
file.c exfat: fix build error with i_blocksize 2020-12-08 12:25:44 +09:00
inode.c exfat: fix use of uninitialized spinlock on error path 2020-10-12 22:56:52 +09:00
Kconfig
Makefile
misc.c
namei.c exfat: remove useless check in exfat_move_file() 2020-10-12 23:02:49 +09:00
nls.c exfat: Avoid allocating upcase table using kcalloc() 2020-12-08 12:51:04 +09:00
README.md
super.c exfat: fix use of uninitialized spinlock on error path 2020-10-12 22:56:52 +09:00

README.md

exFAT filesystem

This is the exfat filesystem for support from the linux 4.1 kernel to the latest kernel.

Installing as a stand-alone module

Install prerequisite package for Fedora, RHEL:

	yum install kernel-devel-$(uname -r)

Build step:

	make
	sudo make install

To load the driver manually, run this as root:

	modprobe exfat

Installing as a part of the kernel

  1. Let's take [linux] as the path to your kernel source dir.
	cd [linux]
	cp -ar exfat [linux]/fs/
  1. edit [linux]/fs/Kconfig
	source "fs/fat/Kconfig"
	+source "fs/exfat/Kconfig"
	source "fs/ntfs/Kconfig"
  1. edit [linux]/fs/Makefile
	obj-$(CONFIG_FAT_FS)          += fat/
	+obj-$(CONFIG_EXFAT_FS)       += exfat/
	obj-$(CONFIG_BFS_FS)          += bfs/
  1. make menuconfig and set exfat
	File systems  --->
		DOS/FAT/NT Filesystems  --->
			<M> exFAT filesystem support
			(utf8) Default iocharset for exFAT

build your kernel