fat: use same logic in fat_search_long() and __fat_readdir()
This uses uses stack for shortname, and uses __getname() for longname in
fat_search_long() and __fat_readdir(). By this, it removes unneeded
__getname() for shortname.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index a441074..96a1cad 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -325,6 +325,19 @@
}
/*
+ * Maximum buffer size of short name.
+ * [(MSDOS_NAME + '.') * max one char + nul]
+ * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul]
+ */
+#define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1)
+/*
+ * Maximum buffer size of unicode chars from slots.
+ * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)]
+ */
+#define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1)
+#define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t))
+
+/*
* Return values: negative -> error, 0 -> not found, positive -> found,
* value is the total amount of slots, including the shortname entry.
*/
@@ -340,15 +353,11 @@
wchar_t bufuname[14];
wchar_t *unicode = NULL;
unsigned char work[MSDOS_NAME];
- unsigned char *bufname = NULL;
+ unsigned char bufname[FAT_MAX_SHORT_SIZE];
unsigned short opt_shortname = sbi->options.shortname;
loff_t cpos = 0;
int chl, i, j, last_u, err, len;
- bufname = __getname();
- if (!bufname)
- return -ENOMEM;
-
err = -ENOENT;
while (1) {
if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
@@ -414,14 +423,17 @@
/* Compare shortname */
bufuname[last_u] = 0x0000;
- len = fat_uni_to_x8(sbi, bufuname, bufname, PATH_MAX);
+ len = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname));
if (fat_name_match(sbi, name, name_len, bufname, len))
goto found;
if (nr_slots) {
+ void *longname = unicode + FAT_MAX_UNI_CHARS;
+ int size = PATH_MAX - FAT_MAX_UNI_SIZE;
+
/* Compare longname */
- len = fat_uni_to_x8(sbi, unicode, bufname, PATH_MAX);
- if (fat_name_match(sbi, name, name_len, bufname, len))
+ len = fat_uni_to_x8(sbi, unicode, longname, size);
+ if (fat_name_match(sbi, name, name_len, longname, len))
goto found;
}
}
@@ -435,8 +447,6 @@
sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
err = 0;
end_of_dir:
- if (bufname)
- __putname(bufname);
if (unicode)
__putname(unicode);
@@ -466,7 +476,8 @@
unsigned char nr_slots;
wchar_t bufuname[14];
wchar_t *unicode = NULL;
- unsigned char c, work[MSDOS_NAME], bufname[56], *ptname = bufname;
+ unsigned char c, work[MSDOS_NAME];
+ unsigned char bufname[FAT_MAX_SHORT_SIZE], *ptname = bufname;
unsigned short opt_shortname = sbi->options.shortname;
int isvfat = sbi->options.isvfat;
int nocase = sbi->options.nocase;
@@ -620,11 +631,10 @@
fill_name = bufname;
fill_len = i;
if (!short_only && nr_slots) {
- /* convert the unicode long name. 261 is maximum size
- * of unicode buffer. (13 * slots + nul) */
- void *longname = unicode + 261;
- int buf_size = PATH_MAX - (261 * sizeof(unicode[0]));
- int long_len = fat_uni_to_x8(sbi, unicode, longname, buf_size);
+ void *longname = unicode + FAT_MAX_UNI_CHARS;
+ int long_len, size = PATH_MAX - FAT_MAX_UNI_SIZE;
+
+ long_len = fat_uni_to_x8(sbi, unicode, longname, size);
if (!both) {
fill_name = longname;