Directory entry structure. More...

#include <dentry.h>

Public Member Functions
	_Atomic (dentry_flags_t) flags

Data Fields
ref_t	ref

dentry_id_t	id

char	name [MAX_NAME]

inode_t *	inode

dentry_t *	parent

list_entry_t	siblingEntry

list_t	children

mutex_t	childrenMutex

superblock_t *	superblock

const dentry_ops_t *	ops

void *	private

map_entry_t	mapEntry

atomic_uint64_t	mountCount

Detailed Description

Directory entry structure.

Definition at line 82 of file dentry.h.

Member Function Documentation

◆ _Atomic()

dentry_t::_Atomic ( dentry_flags_t )

Field Documentation

◆ children

list_t dentry_t::children

Definition at line 90 of file dentry.h.

Referenced by dentry_free(), dentry_generic_getdents(), dentry_make_positive(), dentry_new(), getdents_recursive_traversal(), and ramfs_remove().

◆ childrenMutex

mutex_t dentry_t::childrenMutex

Definition at line 91 of file dentry.h.

Referenced by dentry_free(), dentry_generic_getdents(), dentry_make_positive(), dentry_new(), and getdents_recursive_traversal().

◆ id

dentry_id_t dentry_t::id

Definition at line 85 of file dentry.h.

Referenced by dentry_new(), namespace_bind(), namespace_mount(), namespace_traverse_mount(), vfs_add_dentry(), vfs_get_dentry(), vfs_get_or_lookup_dentry(), and vfs_remove_dentry().

◆ inode

inode_t* dentry_t::inode

Definition at line 87 of file dentry.h.

Referenced by acpi_table_read(), dentry_free(), dentry_generic_getdents(), dentry_make_positive(), dentry_new(), fb_buffer_mmap(), fb_info_read(), file_free(), file_generic_seek(), file_new(), getdents_recursive_traversal(), kbd_events_poll(), kbd_events_read(), kbd_name_read(), mouse_events_poll(), mouse_events_read(), mouse_name_read(), process_file_get_process(), ramfs_link(), ramfs_read(), ramfs_remove(), ramfs_remove_file(), ramfs_write(), socket_accept_open(), socket_ctl_bind(), socket_ctl_connect(), socket_ctl_listen(), socket_data_open(), socket_factory_open(), vfs_create(), vfs_ctx_set_cwd(), vfs_get_or_lookup_dentry(), vfs_getdents(), vfs_ioctl(), vfs_link(), vfs_mmap(), vfs_open(), vfs_open2(), vfs_open_lookup(), vfs_poll(), vfs_read(), vfs_remove(), vfs_stat(), and vfs_write().

◆ mapEntry

map_entry_t dentry_t::mapEntry

Definition at line 95 of file dentry.h.

Referenced by dentry_new(), and vfs_add_dentry().

◆ mountCount

atomic_uint64_t dentry_t::mountCount

The number of mounts on this dentry.

If greater then 0 and a mountpoint mounted here is in a accessible namespace, we can traverse from this dentry to the root dentry of the mounted filesystem.

The difference between a mountpoint dentry and a root dentry can be a bit confusing, so here is a quick explanation. When a filesystem is mounted the dentry that it gets mounted to becomes a mountpoint, any data that was there before becomes hidden and when we traverse to that dentry we "jump" over to the root dentry of the mounted filesystem. The root dentry of the mounted filesystem is simply the root directory of that filesystem.

This means that the mountpoint does not "become" the root of the mounted filesystem, it simply points to it.

Finally, note that just becouse a dentry is a mountpoint does not mean that it can be traversed by the current process, a process can only traverse a mountpoint if it is visible in its namespace, if its not visible the dentry acts exactly like a normal dentry.

Definition at line 114 of file dentry.h.

Referenced by dentry_dec_mount_count(), dentry_inc_mount_count(), dentry_new(), path_walk(), and path_walk_single_step().