On Monday 07 May 2007, Roland Kuhn wrote: > Hi! > > On 7 May 2007, at 20:27, OGAWA Hirofumi wrote: > > Roland Kuhn <[email protected]> writes: > >> PATH_MAX specifically counts _bytes_ not characters, so UTF-8 does > >> not matter. ISTR that PATH_MAX was 256 at some point, but I just > >> quickly grepped /usr/include and found various mention of 4096, so > >> where's the central repository for this configuration item? A hard- > >> coded value of 256 somewhere inside the kernel smells like a bug. > > > > There is a nasty issue here. FAT is limited by 255 unicode chars or > > so. > > So, we would need to count number of unicode chars of filename. > > No, we don't. At least not when looking at the POSIX spec, which > explicitly mentions _bytes_ and _not_ unicode characters. So, to be > on the safe side, FAT filesystems would need to support a NAME_MAX of > roughly 6*255+3=1533 bytes (not to mention the hassles of forbidden > sequences, etc.; do we need to count zero-width characters?) How is this issue related to character *width* at all? > and > report it through pathconf() to userspace, then userspace could do > with that whatever it liked. > > What happened to: "file names are just sequences of octets, excluding > '/' and NUL"? Adding unicode parsing to the kernel is completely > useless _and_ a big trouble maker. > Who speaks about unicode parsing? UCS2 - UTF-8 transformation does and requires no parsing; this is simply conversion between on-disk and in-kernel representation (like endian conversion). Anyway we are doing it now already; how support for larger name length limit changes it? -andrey
Attachment:
pgphDRKaKA6VP.pgp
Description: PGP signature
- References:
- Long file names in VFAT broken with iocharset=utf8
- From: Andrey Borzenkov <[email protected]>
- Re: Long file names in VFAT broken with iocharset=utf8
- From: OGAWA Hirofumi <[email protected]>
- Re: Long file names in VFAT broken with iocharset=utf8
- From: Roland Kuhn <[email protected]>
- Long file names in VFAT broken with iocharset=utf8
- Prev by Date: Re: D-Link DFE-580TX 4 port NIC problems
- Next by Date: Re: [GIT PATCHES] V4L/DVB updates
- Previous by thread: Re: Long file names in VFAT broken with iocharset=utf8
- Next by thread: Re: Long file names in VFAT broken with iocharset=utf8
- Index(es):
 |