diff options
author | Anatolij Gustschin <agust@denx.de> | 2011-12-15 03:12:14 +0000 |
---|---|---|
committer | Wolfgang Denk <wd@denx.de> | 2011-12-20 23:18:43 +0100 |
commit | 8506eb8d6abefa6d91468a8c350b60ce3321a53e (patch) | |
tree | 22df26ec9b13be6a746c3a26d53db59f1c7b8f00 /fs/fat | |
parent | e27334212c919c1e9467408da36f2cd34a8a65be (diff) |
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>
Diffstat (limited to 'fs/fat')
-rw-r--r-- | fs/fat/fat_write.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c index 4f1772f29a..3542b0bcbd 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) |