Package: linux-image-4.6.0-1-amd64 Version: 4.6.4-1 Hello,
The Debian kernel currently has CONFIG_FAT_DEFAULT_IOCHARSET="utf8" enabled. This is not recommended [1]: | config FAT_DEFAULT_IOCHARSET | string "Default iocharset for FAT" | depends on VFAT_FS | default "iso8859-1" | help | Set this to the default input/output character set you'd | like FAT to use. It should probably match the character set | that most of your FAT filesystems use, and can be overridden | with the "iocharset" mount option for FAT filesystems. | Note that "utf8" is not recommended for FAT filesystems. | If unsure, you shouldn't set "utf8" here - select the next option | instead if you would like to use UTF-8 encoded file names by default. | See <file:Documentation/filesystems/vfat.txt> for more information. This leads to irritating bugs [2][3] and misleading stat()/open()/mkdir() as it seems that a file or dir simultaneously exists and not exists: $ mkdir FOO $ test -e Foo && echo yes || echo no no $ mkdir -p Foo mkdir: cannot create directory ‘Foo’: File exists This is on a VFAT partition with the default mount options: (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=utf8,shortname=mixed,errors=remount-ro) This can be worked around by always using all uppercase file names, but this is not very obvious and prone to get wrong. It behaves much better with mount -o utf8,iocharset=ascii: $ test -e Foo && echo yes || echo no yes yes $ mkdir -p Foo # succeeds $ With the first try and the default mount options I created a file "Hällé€". This still appears correctly with utf8,iocharset=ascii. So I suggest to set CONFIG_FAT_DEFAULT_IOCHARSET="ascii" FAT_DEFAULT_UTF8=y instead. Thanks for considering, Martin [1] https://github.com/torvalds/linux/blob/38739380683795354b3f0f1a1e80614e311b8617/fs/fat/Kconfig#L86 [2] https://bugs.debian.org/745280 [3] https://github.com/systemd/systemd/issues/3740 -- Martin Pitt | http://www.piware.de Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
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