43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
#include <kernel/fs/smemfs.h>
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#include <kernel/util/atomic.h>
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/* smemfs_find_first_child() - Find the fist file in the (folder) inode (sync) */
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void *smemfs_USB2_find_first_child(void *inode)
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{
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extern struct smemfs_USB2_superblock smemfs_USB2_superblock;
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uint16_t folder_id;
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void *child_inode;
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// Check error.
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if (inode == NULL)
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return (NULL);
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// Start atomic operation
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atomic_start();
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// Check root inode
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if (inode == smemfs_USB2_superblock.sector_table)
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{
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folder_id = CASIO_SMEM_ROOT_ID;
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} else {
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// Check inode validity
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if (((struct casio_smem_header_s *)inode)->info != CASIO_SMEM_HEADER_INFO_EXIST ||
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((struct casio_smem_header_s *)inode)->type != CASIO_SMEM_HEADER_TYPE_DIRECTORY)
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{
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atomic_stop();
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return (NULL);
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}
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// Get directory ID
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folder_id = ((struct casio_smem_header_s *)inode)->id;
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}
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// Return the first child of the file.
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child_inode = smemfs_USB2_walk(inode, smemfs_USB2_superblock.inode_table,
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folder_id, WALK_FLAG_ID_CHECK_PARENT);
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// Stop atomic operation
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atomic_stop();
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return (child_inode);
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}
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