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fs:ext4:write: Add lldiv and do_div to perform 64-32 bits division 

The ext4write code has been using direct calls to 64-32 division
(/ and %).

Officially supported u-boot toolchains (eldk-5.[12].x) generate calls
to __aeabi_uldivmod(), which is niether defined in the toolchain libs
nor u-boot source tree.

Due to that, when the ext4write command has been executed, "undefined
instruction" execption was generated (since the __aeabi_uldivmod()
is not provided).

To fix this error, lldiv() for division and do_div() for modulo have
been used.

Those two functions are recommended for performing 64-32 bit number
division in u-boot.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Łukasz Majewski 2012-12-05 08:06:37 +00:00 committed by Tom Rini
parent 3fdf7596df
commit 32fc16d7e7
1 changed files with 3 additions and 2 deletions
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5
fs/ext4/ext4fs.c
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@ -40,6 +40,7 @@
#include <linux/stat.h>
#include <linux/time.h>
#include <asm/byteorder.h>
#include <div64.h>
#include "ext4_common.h"
int ext4fs_symlinknest;
@ -1051,8 +1052,8 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
}
/* calucalate how many blocks required */
bytes_reqd_for_file = sizebytes;
blks_reqd_for_file = bytes_reqd_for_file / fs->blksz;
if (bytes_reqd_for_file % fs->blksz != 0) {
blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz);
if (do_div(bytes_reqd_for_file, fs->blksz) != 0) {
blks_reqd_for_file++;
debug("total bytes for a file %u\n", blks_reqd_for_file);
}