On 07/20/2018 04:57 AM, AKASHI Takahiro wrote:
> In this patch, mkdir support is added to FAT file system.
> A newly created directory contains only "." and ".." entries.
>
> Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
The patch does set the creation date of the directory according to the
real time clock but to 1980-01-01T00:00:00Z.
$ ls /mnt/dir1/ -la --full-time
drwxr-xr-x 2 root root 2048 1980-01-01 01:00:00.000000000 +0100 dir3
Please, set the time correctly if the real time clock is available.
Best regards
Heinrich
> ---
> fs/fat/fat_write.c | 138 +++++++++++++++++++++++++++++++++++++++++++++
> fs/fs.c | 3 +-
> include/fat.h | 1 +
> 3 files changed, 141 insertions(+), 1 deletion(-)
>
> diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
> index cc45a33876..781883c9f4 100644
> --- a/fs/fat/fat_write.c
> +++ b/fs/fat/fat_write.c
> @@ -1185,3 +1185,141 @@ int file_fat_write(const char *filename, void
> *buffer, loff_t offset,
> {
> return file_fat_write_at(filename, offset, buffer, maxsize, actwrite);
> }
> +
> +int fat_mkdir(const char *new_dirname)
> +{
> + dir_entry *retdent;
> + fsdata datablock = { .fatbuf = NULL, };
> + fsdata *mydata = &datablock;
> + fat_itr *itr = NULL;
> + char *dirname_copy, *parent, *dirname;
> + char l_dirname[VFAT_MAXLEN_BYTES];
> + int ret = -1;
> + loff_t actwrite;
> + unsigned int bytesperclust;
> + dir_entry *dotdent = NULL;
> +
> + dirname_copy = strdup(new_dirname);
> + if (!dirname_copy)
> + goto exit;
> +
> + split_filename(dirname_copy, &parent, &dirname);
> + if (!strlen(dirname)) {
> + ret = -EINVAL;
> + goto exit;
> + }
> +
> + if (normalize_longname(l_dirname, dirname)) {
> + printf("FAT: illegal filename (%s)\n", dirname);
> + ret = -EINVAL;
> + goto exit;
> + }
> +
> + itr = malloc_cache_aligned(sizeof(fat_itr));
> + if (!itr) {
> + ret = -ENOMEM;
> + goto exit;
> + }
> +
> + ret = fat_itr_root(itr, &datablock);
> + if (ret)
> + goto exit;
> +
> + total_sector = datablock.bs_total_sect;
> + if (total_sector == 0)
> + total_sector = (int)cur_part_info.size; /* cast of lbaint_t */
> +
> + ret = fat_itr_resolve(itr, parent, TYPE_DIR);
> + if (ret) {
> + printf("%s: doesn't exist (%d)\n", parent, ret);
> + goto exit;
> + }
> +
> + retdent = find_directory_entry(itr, l_dirname);
> +
> + if (retdent) {
> + printf("%s: already exists\n", l_dirname);
> + ret = -EEXIST;
> + goto exit;
> + } else {
> + if (itr->is_root) {
> + /* root dir cannot have "." or ".." */
> + if (!strcmp(l_dirname, ".") ||
> + !strcmp(l_dirname, "..")) {
> + ret = -EINVAL;
> + goto exit;
> + }
> + }
> +
> + if (!itr->dent) {
> + printf("Error: allocating new dir entry\n");
> + ret = -EIO;
> + goto exit;
> + }
> +
> + memset(itr->dent, 0, sizeof(*itr->dent));
> +
> + /* Set short name to set alias checksum field in dir_slot */
> + set_name(itr->dent, dirname);
> + fill_dir_slot(itr, dirname);
> +
> + /* Set attribute as archieve for regular file */
> + fill_dentry(itr->fsdata, itr->dent, dirname, 0, 0,
> + ATTR_DIR | ATTR_ARCH);
> +
> + retdent = itr->dent;
> + }
> +
> + /* Default entries */
> + bytesperclust = mydata->clust_size * mydata->sect_size;
> + dotdent = malloc_cache_aligned(bytesperclust);
> + if (!dotdent) {
> + ret = -ENOMEM;
> + goto exit;
> + }
> + memset(dotdent, 0, bytesperclust);
> +
> + memcpy(dotdent[0].name, ". ", 8);
> + memcpy(dotdent[0].ext, " ", 3);
> + dotdent[0].attr = ATTR_DIR | ATTR_ARCH;
> +
> + memcpy(dotdent[1].name, ".. ", 8);
> + memcpy(dotdent[1].ext, " ", 3);
> + dotdent[1].attr = ATTR_DIR | ATTR_ARCH;
> + set_start_cluster(mydata, &dotdent[1], itr->start_clust);
> +
> + ret = set_contents(mydata, retdent, 0, (__u8 *)dotdent, bytesperclust,
> + &actwrite);
> + if (ret < 0) {
> + printf("Error: writing contents\n");
> + goto exit;
> + }
> + /* Write twice for "." */
> + set_start_cluster(mydata, &dotdent[0], START(retdent));
> + ret = set_contents(mydata, retdent, 0, (__u8 *)dotdent, bytesperclust,
> + &actwrite);
> + if (ret < 0) {
> + printf("Error: writing contents\n");
> + goto exit;
> + }
> +
> + /* Flush fat buffer */
> + ret = flush_dirty_fat_buffer(mydata);
> + if (ret) {
> + printf("Error: flush fat buffer\n");
> + goto exit;
> + }
> +
> + /* Write directory table to device */
> + ret = set_cluster(mydata, itr->clust, itr->block,
> + mydata->clust_size * mydata->sect_size);
> + if (ret)
> + printf("Error: writing directory entry\n");
> +
> +exit:
> + free(dirname_copy);
> + free(mydata->fatbuf);
> + free(itr);
> + free(dotdent);
> + return ret;
> +}
> diff --git a/fs/fs.c b/fs/fs.c
> index 3cb6b21fe9..a92e060296 100644
> --- a/fs/fs.c
> +++ b/fs/fs.c
> @@ -164,14 +164,15 @@ static struct fstype_info fstypes[] = {
> .read = fat_read_file,
> #ifdef CONFIG_FAT_WRITE
> .write = file_fat_write,
> + .mkdir = fat_mkdir,
> #else
> .write = fs_write_unsupported,
> + .mkdir = fs_mkdir_unsupported,
> #endif
> .uuid = fs_uuid_unsupported,
> .opendir = fat_opendir,
> .readdir = fat_readdir,
> .closedir = fat_closedir,
> - .mkdir = fs_mkdir_unsupported,
> },
> #endif
> #ifdef CONFIG_FS_EXT4
> diff --git a/include/fat.h b/include/fat.h
> index 295da0f243..039b6e03de 100644
> --- a/include/fat.h
> +++ b/include/fat.h
> @@ -237,5 +237,6 @@ int fat_read_file(const char *filename, void *buf, loff_t
> offset, loff_t len,
> int fat_opendir(const char *filename, struct fs_dir_stream **dirsp);
> int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp);
> void fat_closedir(struct fs_dir_stream *dirs);
> +int fat_mkdir(const char *dirname);
> void fat_close(void);
> #endif /* _FAT_H_ */
>
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