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authorAnatolij Gustschin <agust@denx.de>2011-12-15 03:12:14 +0000
committerWolfgang Denk <wd@denx.de>2011-12-20 23:18:43 +0100
commit8506eb8d6abefa6d91468a8c350b60ce3321a53e (patch)
tree22df26ec9b13be6a746c3a26d53db59f1c7b8f00
parente27334212c919c1e9467408da36f2cd34a8a65be (diff)
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FAT: fix some issues in FAT write support code
Writing a file to the FAT partition didn't work while a test using a CF card. The test was done on mpc5200 based board (powerpc). There is a number of problems in FAT write code: Compiler warning: fat_write.c: In function 'file_fat_write': fat_write.c:326: warning: 'counter' may be used uninitialized in this function fat_write.c:326: note: 'counter' was declared here 'l_filename' string is not terminated, so a file name with garbage at the end is used as a file name as shown by debug code. Return value of set_contents() is not checked properly so actually a file won't be written at all (as checked using 'fatls' after a write attempt with 'fatwrite' command). do_fat_write() doesn't return the number of written bytes if no error happened. However the return value of this function is used to show the number of written bytes in do_fat_fswrite(). The patch adds some debug code and fixes above mentioned problems and also fixes a typo in error output. NOTE: after a successful write to the FAT partition (under U-Boot) the partition was checked under Linux using fsck. The partition needed fixing FATs: -bash-3.2# fsck -a /dev/sda1 fsck 1.39 (29-May-2006) dosfsck 2.11, 12 Mar 2005, FAT32, LFN FATs differ but appear to be intact. Using first FAT. Performing changes. Signed-off-by: Anatolij Gustschin <agust@denx.de> Cc: Donggeun Kim <dg77.kim@samsung.com> Cc: Aaron Williams <Aaron.Williams@cavium.com> Acked-by: Donggeun Kim <dg77.kim@samsung.com>
-rw-r--r--fs/fat/fat_write.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index 4f1772f..3542b0b 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -323,7 +323,7 @@ static void
fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name)
{
dir_slot *slotptr = (dir_slot *)get_vfatname_block;
- __u8 counter, checksum;
+ __u8 counter = 0, checksum;
int idx = 0, ret;
char s_name[16];
@@ -926,6 +926,7 @@ static int do_fat_write(const char *filename, void *buffer,
int cursect;
int root_cluster, ret = -1, name_len;
char l_filename[VFAT_MAXLEN_BYTES];
+ int write_size = size;
dir_curclust = 0;
@@ -985,7 +986,11 @@ static int do_fat_write(const char *filename, void *buffer,
dentptr = (dir_entry *) do_fat_read_block;
name_len = strlen(filename);
+ if (name_len >= VFAT_MAXLEN_BYTES)
+ name_len = VFAT_MAXLEN_BYTES - 1;
+
memcpy(l_filename, filename, name_len);
+ l_filename[name_len] = 0; /* terminate the string */
downcase(l_filename);
startsect = mydata->rootdir_sect;
@@ -1012,10 +1017,12 @@ static int do_fat_write(const char *filename, void *buffer,
}
ret = set_contents(mydata, retdent, buffer, size);
- if (ret) {
+ if (ret < 0) {
printf("Error: writing contents\n");
goto exit;
}
+ write_size = ret;
+ debug("attempt to write 0x%x bytes\n", write_size);
/* Flush fat buffer */
ret = flush_fat_buffer(mydata);
@@ -1029,7 +1036,7 @@ static int do_fat_write(const char *filename, void *buffer,
get_dentfromdir_block,
mydata->clust_size * mydata->sect_size);
if (ret) {
- printf("Error: wrinting directory entry\n");
+ printf("Error: writing directory entry\n");
goto exit;
}
} else {
@@ -1056,10 +1063,12 @@ static int do_fat_write(const char *filename, void *buffer,
start_cluster, size, 0x20);
ret = set_contents(mydata, empty_dentptr, buffer, size);
- if (ret) {
+ if (ret < 0) {
printf("Error: writing contents\n");
goto exit;
}
+ write_size = ret;
+ debug("attempt to write 0x%x bytes\n", write_size);
/* Flush fat buffer */
ret = flush_fat_buffer(mydata);
@@ -1080,7 +1089,7 @@ static int do_fat_write(const char *filename, void *buffer,
exit:
free(mydata->fatbuf);
- return ret;
+ return ret < 0 ? ret : write_size;
}
int file_fat_write(const char *filename, void *buffer, unsigned long maxsize)