linux.git/fs/unicode/utf8-core.c, branch v5.8

unicode: make array 'token' static const, makes object smaller

2019-09-17T15:48:24+00:00

Don't populate the array 'token' on the stack but instead make it
static const. Makes the object code smaller by 234 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
   5371	    272	      0	   5643	   160b	fs/unicode/utf8-core.o

After:
   text	   data	    bss	    dec	    hex	filename
   5041	    368	      0	   5409	   1521	fs/unicode/utf8-core.o

(gcc version 9.2.1, amd64)

Signed-off-by: Colin Ian King 
Reviewed-by: Theodore Ts'o 
Signed-off-by: Gabriel Krisman Bertazi

ext4: optimize case-insensitive lookups

2019-06-20T03:45:09+00:00

Temporarily cache a casefolded version of the file name under lookup in
ext4_filename, to avoid repeatedly casefolding it.  I got up to 30%
speedup on lookups of large directories (>100k entries), depending on
the length of the string under lookup.

Signed-off-by: Gabriel Krisman Bertazi 
Signed-off-by: Theodore Ts'o

unicode: implement higher level API for string handling

2019-04-25T17:51:22+00:00

This patch integrates the utf8n patches with some higher level API to
perform UTF-8 string comparison, normalization and casefolding
operations.  Implemented is a variation of NFD, and casefold is
performed by doing full casefold on top of NFD.  These algorithms are
based on the core implemented by Olaf Weber from SGI.

Signed-off-by: Gabriel Krisman Bertazi 
Signed-off-by: Theodore Ts'o