It would be good that FAT write function return error code instead of just returning -1 as fat_read_file() does. This patch attempts to address this issue although it is 'best effort (or estimate)' for now.
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- fs/fat/fat_write.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c index 6c715a70f4..1e4f5af910 100644 --- a/fs/fat/fat_write.c +++ b/fs/fat/fat_write.c @@ -956,7 +956,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { debug("error: reading boot sector\n"); - return -1; + return -EIO; }
total_sector = bs.total_sect; @@ -997,7 +997,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE); if (mydata->fatbuf == NULL) { debug("Error: allocating memory\n"); - return -1; + return -ENOMEM; }
if (disk_read(cursect, @@ -1005,6 +1005,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, (mydata->clust_size) : PREFETCH_BLOCKS, do_fat_read_at_block) < 0) { debug("Error: reading rootdir block\n"); + ret = -EIO; goto exit; } dentptr = (dir_entry *) do_fat_read_at_block; @@ -1029,6 +1030,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, size); if (ret) { printf("Error: %llu overflow\n", size); + ret = -ENOSPC; goto exit; } } @@ -1036,6 +1038,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, ret = clear_fatent(mydata, start_cluster); if (ret) { printf("Error: clearing FAT entries\n"); + ret = -EIO; goto exit; }
@@ -1045,12 +1048,14 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, ret = start_cluster = find_empty_cluster(mydata); if (ret < 0) { printf("Error: finding empty cluster\n"); + ret = -ENOSPC; goto exit; }
ret = check_overflow(mydata, start_cluster, size); if (ret) { printf("Error: %llu overflow\n", size); + ret = -ENOSPC; goto exit; }
@@ -1065,12 +1070,14 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, ret = start_cluster = find_empty_cluster(mydata); if (ret < 0) { printf("Error: finding empty cluster\n"); + ret = -ENOSPC; goto exit; }
ret = check_overflow(mydata, start_cluster, size); if (ret) { printf("Error: %llu overflow\n", size); + ret = -ENOSPC; goto exit; } } else { @@ -1087,6 +1094,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, ret = set_contents(mydata, retdent, buffer, size, actwrite); if (ret < 0) { printf("Error: writing contents\n"); + ret = -EIO; goto exit; } debug("attempt to write 0x%llx bytes\n", *actwrite); @@ -1095,14 +1103,17 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size, ret = flush_dirty_fat_buffer(mydata); if (ret) { printf("Error: flush fat buffer\n"); + ret = -EIO; goto exit; }
/* Write directory table to device */ ret = set_cluster(mydata, dir_curclust, get_dentfromdir_block, mydata->clust_size * mydata->sect_size); - if (ret) + if (ret) { printf("Error: writing directory entry\n"); + ret = -EIO; + }
exit: free(mydata->fatbuf); @@ -1114,7 +1125,7 @@ int file_fat_write(const char *filename, void *buffer, loff_t offset, { if (offset != 0) { printf("Error: non zero offset is currently not supported.\n"); - return -1; + return -EINVAL; }
printf("writing %s\n", filename);