43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
#include <kernel/fs/smemfs.h>
|
|
#include <kernel/util/atomic.h>
|
|
|
|
/* smemfs_find_first_child() - Find the fist file in the (folder) inode (sync) */
|
|
void *smemfs_find_first_child(void *inode)
|
|
{
|
|
extern struct smemfs_superblock_s smemfs_superblock;
|
|
uint16_t folder_id;
|
|
void *child_inode;
|
|
|
|
// Check error.
|
|
if (inode == NULL)
|
|
return (NULL);
|
|
|
|
// Start atomic operation
|
|
atomic_start();
|
|
|
|
// Check root inode
|
|
if (inode == smemfs_superblock.sector_table)
|
|
{
|
|
folder_id = CASIO_SMEM_ROOT_ID;
|
|
} else {
|
|
// Check inode validity
|
|
if (((struct casio_smem_header_s *)inode)->info != CASIO_SMEM_HEADER_INFO_EXIST ||
|
|
((struct casio_smem_header_s *)inode)->type != CASIO_SMEM_HEADER_TYPE_DIRECTORY)
|
|
{
|
|
atomic_stop();
|
|
return (NULL);
|
|
}
|
|
|
|
// Get directory ID
|
|
folder_id = ((struct casio_smem_header_s *)inode)->id;
|
|
}
|
|
|
|
// Return the first child of the file.
|
|
child_inode = smemfs_walk(inode, smemfs_superblock.inode_table,
|
|
folder_id, WALK_FLAG_ID_CHECK_PARENT);
|
|
|
|
// Stop atomic operation
|
|
atomic_stop();
|
|
return (child_inode);
|
|
}
|