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dosfs: Simplify msdos_creat_node()

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Update #2929.
This commit is contained in:
Sebastian Huber
2017-03-14 08:13:07 +01:00
parent c38f1fcf8f
commit 201f3797b3
1 changed files with 14 additions and 21 deletions
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35
cpukit/libfs/src/dosfs/msdos_create.c
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@@ -179,6 +179,8 @@ msdos_creat_node(const rtems_filesystem_location_info_t *parent_loc,
*/
if (type == FAT_DIRECTORY)
{
uint32_t unused;
/* open new directory as fat-file */
rc = fat_file_open(&fs_info->fat, &dir_pos, &fat_fd);
if (rc != RC_OK)
@@ -188,11 +190,19 @@ msdos_creat_node(const rtems_filesystem_location_info_t *parent_loc,
* we opened fat-file for node we just created, so initialize fat-file
* descritor
*/
fat_fd->fat_file_size = 0;
fat_fd->fat_file_type = FAT_DIRECTORY;
fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT;
fat_file_set_ctime_mtime(fat_fd, now);
/* extend it to contain exactly one cluster */
rc = fat_file_extend(&fs_info->fat,
fat_fd,
true,
fs_info->fat.vol.bpc,
&unused);
if (rc != RC_OK)
goto err;
/*
* dot and dotdot entries are identical to new node except the
* names
@@ -226,33 +236,16 @@ msdos_creat_node(const rtems_filesystem_location_info_t *parent_loc,
CT_LE_W((uint16_t )(((parent_fat_fd->cln) & 0xFFFF0000)>>16));
}
/*
* write dot and dotdot entries to new fat-file: currently fat-file
* correspondes to a new node is zero length, so it will be extended
* by one cluster and entries will be written
*/
ret = fat_file_write(&fs_info->fat, fat_fd, 0,
MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2,
(uint8_t *)dot_dotdot);
if (ret < 0)
{
rc = -1;
goto error;
}
/* increment fat-file size by cluster size */
fat_fd->fat_file_size += fs_info->fat.vol.bpc;
/* set up cluster num for dot entry */
*MSDOS_DIR_FIRST_CLUSTER_LOW(DOT_NODE_P(dot_dotdot)) =
CT_LE_W((uint16_t )((fat_fd->cln) & 0x0000FFFF));
*MSDOS_DIR_FIRST_CLUSTER_HI(DOT_NODE_P(dot_dotdot)) =
CT_LE_W((uint16_t )(((fat_fd->cln) & 0xFFFF0000) >> 16));
/* rewrite dot entry */
/* write dot and dotdot entries */
ret = fat_file_write(&fs_info->fat, fat_fd, 0,
MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE,
(uint8_t *)DOT_NODE_P(dot_dotdot));
MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2,
(uint8_t *)dot_dotdot);
if (ret < 0)
{
rc = -1;