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Filename Latest commit message Latest commit date
Eric Sandeen 3f985aa6d5 exfat: use iter_file_splice_write 
Doing copy_file_range() on exfat with a file opened for direct IO leads
to an -EFAULT:

# xfs_io -f -d -c "truncate 32768" \
       -c "copy_range -d 16384 -l 16384 -f 0" /mnt/test/junk
copy_range: Bad address

and the reason seems to be that we go through:

default_file_splice_write
 splice_from_pipe
  __splice_from_pipe
   write_pipe_buf
    __kernel_write
     new_sync_write
      generic_file_write_iter
       generic_file_direct_write
        exfat_direct_IO
         do_blockdev_direct_IO
          iov_iter_get_pages

and land in iterate_all_kinds(), which does "return -EFAULT" for our kvec
iter.

Setting exfat's splice_write to iter_file_splice_write fixes this and lets
fsx (which originally detected the problem) run to success from the xfstests
harness.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
2020-05-03 23:26:10 +09:00
.travis.yml exfat: add create file and directory test 2020-04-07 15:09:18 +09:00
.travis_cmd_wrapper.pl exfat: add travis-CI build and test support 2020-02-03 22:43:47 +09:00
.travis_get_mainline_kernel exfat: add travis-CI build and test support 2020-02-03 22:43:47 +09:00
balloc.c exfat: Unify access to the boot sector 2020-04-06 14:11:45 +09:00
cache.c exfat: initial commit 2020-02-03 21:47:19 +09:00
dir.c exfat: replace 'time_ms' with 'time_cs' 2020-05-03 23:11:32 +09:00
exfat_fs.h exfat: replace 'time_ms' with 'time_cs' 2020-05-03 23:11:32 +09:00
exfat_raw.h exfat: replace 'time_ms' with 'time_cs' 2020-05-03 23:11:32 +09:00
fatent.c exfat: Use a more common logging style 2020-04-06 12:50:48 +09:00
file.c exfat: use iter_file_splice_write 2020-05-03 23:26:10 +09:00
inode.c exfat: replace 'time_ms' with 'time_cs' 2020-05-03 23:11:32 +09:00
Kconfig exfat: initial commit 2020-02-03 21:47:19 +09:00
Makefile exfat: linux 4.16 kernel build support 2020-02-04 09:18:10 +09:00
misc.c exfat: replace 'time_ms' with 'time_cs' 2020-05-03 23:11:32 +09:00
namei.c exfat: replace 'time_ms' with 'time_cs' 2020-05-03 23:11:32 +09:00
nls.c exfat: Remove unused functions exfat_high_surrogate() and exfat_low_surrogate() 2020-04-16 09:46:18 +09:00
README.md exfat: fix typo 2020-02-10 21:35:58 +09:00
super.c exfat: truncate atimes to 2s granularity 2020-04-21 10:17:24 +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