77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
#include <kernel/fs/vfs.h>
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#include <kernel/memory.h>
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#include <kernel/util.h>
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#include <kernel/fs/stat.h>
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struct dentry *vfs_dentry_find_first_child(struct dentry *dentry)
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{
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// Check file type
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if (dentry == NULL || (dentry->mode & __S_IFDIR) == 0)
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return (NULL);
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// Try to find next sibling into the VFS cache
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if (dentry->child != NULL)
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return (dentry->child);
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// Check internal primitives
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if (dentry->dentry_op.inode_op == NULL ||
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dentry->dentry_op.inode_op->find_first_child == NULL ||
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dentry->dentry_op.inode_op->get_mode == NULL ||
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dentry->dentry_op.inode_op->get_name == NULL)
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return (NULL);
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// Try to get first child inode
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int mounted = 0;
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void *inode = dentry->dentry_op.inode_op->find_first_child(dentry->inode);
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if (inode == NULL)
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{
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// Check mnt point
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if (dentry->mnt.inode == NULL ||
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dentry->mnt.inode_op == NULL ||
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dentry->mnt.inode_op->find_first_child == NULL ||
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dentry->mnt.inode_op->get_mode == NULL ||
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dentry->mnt.inode_op->get_name == NULL)
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return (NULL);
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// Try to get mounted child
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inode = dentry->mnt.inode_op->find_first_child(dentry->mnt.inode);
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if (inode == NULL)
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return (NULL);
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// Indicate mounted point
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mounted = 1;
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}
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// Try to create new dentry
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struct dentry *new_dentry = pm_alloc(sizeof(struct dentry));
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if (new_dentry == NULL)
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return (NULL);
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// Initialize new dentry
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if (mounted == 0)
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{
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dentry->dentry_op.inode_op->get_name(inode, new_dentry->name, VFS_DENTRY_NAME_LENGHT);
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new_dentry->mode = dentry->dentry_op.inode_op->get_mode(inode);
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new_dentry->dentry_op.inode_op = dentry->dentry_op.inode_op;
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new_dentry->dentry_op.file_op = dentry->dentry_op.file_op;
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} else {
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dentry->mnt.inode_op->get_name(inode, new_dentry->name, VFS_DENTRY_NAME_LENGHT);
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new_dentry->mode = dentry->mnt.inode_op->get_mode(inode);
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new_dentry->dentry_op.inode_op = dentry->mnt.inode_op;
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new_dentry->dentry_op.file_op = dentry->mnt.file_op;
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}
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// Common init
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new_dentry->inode = inode;
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new_dentry->parent = dentry;
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new_dentry->child = NULL;
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new_dentry->next = dentry->child;
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new_dentry->mnt.inode = NULL;
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new_dentry->mnt.file_op = NULL;
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new_dentry->mnt.inode_op = NULL;
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// Update VFS cache en return
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dentry->child = new_dentry;
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return (new_dentry);
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}
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