[Bug localedata/5033] locarchive does not provide fallback for mmap()

["junkmailnotread at yahoo dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=5033

junkmailnotread at yahoo dot com changed:

           What    |Removed                     |Added
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                 CC|                            |junkmailnotread at yahoo
                   |                            |dot com

--- Comment #1 from junkmailnotread at yahoo dot com 2012-02-21 14:42:33 UTC ---
This is a serious bug and still present in glibc-2.13. Why no progress?

To clarify, localedef *fails* if /usr/lib/locale/locale-archive is located on a
file system - such as JFFS2 - which does not support the mmap(2) MAP_SHARED
flag.

As far as I can tell, any Linux kernel file system whose mmap handler is:
generic_file_readonly_mmap()
does not support MAP_SHARED. Currently, as of linux-3.3, these include:

9p
afs
jffs2
logfs

The bug is easy to demonstrate. Here, the root file system is a JFFS2 file
system, and /var/tmp is a tmpfs file system:

# ls -l /usr/lib/locale
total 0
# df /usr/lib/locale
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root                78592     27816     50776  36% /
# localedef -f ISO-8859-1 -i en_GB en_GB.ISO-8859-1
cannot map archive header: Invalid argument
# rmdir /usr/lib/locale
# ln -s /var/tmp /usr/lib/locale
# df /usr/lib/locale
Filesystem           1K-blocks      Used Available Use% Mounted on
none                     30664        24     30640   1% /var
# localedef -f ISO-8859-1 -i en_GB en_GB.ISO-8859-1
# localedef --list
en_GB.iso88591
# 

I've just spent a day tracking this bug down, only to discover it was reported
over 4 years ago.

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