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cifs: convert case-insensitive dentry ops to use new case conversion routines

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Have the case-insensitive d_compare and d_hash routines convert each
character in the filenames to wchar_t's and then use the new
cifs_toupper routine to convert those into uppercase.

With this scheme we should more closely emulate the case conversion that
the servers will do.

Reported-and-Tested-by: Jan-Marek Glogowski <glogow@fbihome.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton 2013-09-05 08:38:11 -04:00 committed by Steve French
parent c2ccf53dd0
commit ec71e0e159
1 changed files with 50 additions and 8 deletions
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56
fs/cifs/dir.c
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@ -32,6 +32,7 @@
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
static void
renew_parental_timestamps(struct dentry *direntry)
@ -834,12 +835,17 @@ static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
{
struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
unsigned long hash;
int i;
wchar_t c;
int i, charlen;
hash = init_name_hash();
for (i = 0; i < q->len; i++)
hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
hash);
for (i = 0; i < q->len; i += charlen) {
charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
/* error out if we can't convert the character */
if (unlikely(charlen < 0))
return charlen;
hash = partial_name_hash(cifs_toupper(c), hash);
}
q->hash = end_name_hash(hash);
return 0;
@ -849,11 +855,47 @@ static int cifs_ci_compare(const struct dentry *parent, const struct dentry *den
unsigned int len, const char *str, const struct qstr *name)
{
struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls;
wchar_t c1, c2;
int i, l1, l2;
if ((name->len == len) &&
(nls_strnicmp(codepage, name->name, str, len) == 0))
return 0;
/*
* We make the assumption here that uppercase characters in the local
* codepage are always the same length as their lowercase counterparts.
*
* If that's ever not the case, then this will fail to match it.
*/
if (name->len != len)
return 1;
for (i = 0; i < len; i += l1) {
/* Convert characters in both strings to UTF-16. */
l1 = codepage->char2uni(&str[i], len - i, &c1);
l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
/*
* If we can't convert either character, just declare it to
* be 1 byte long and compare the original byte.
*/
if (unlikely(l1 < 0 && l2 < 0)) {
if (str[i] != name->name[i])
return 1;
l1 = 1;
continue;
}
/*
* Here, we again ass|u|me that upper/lowercase versions of
* a character are the same length in the local NLS.
*/
if (l1 != l2)
return 1;
/* Now compare uppercase versions of these characters */
if (cifs_toupper(c1) != cifs_toupper(c2))
return 1;
}
return 0;
}
const struct dentry_operations cifs_ci_dentry_ops = {