69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
// vfs.h
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// Author: Josh Holtrop
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// Date: 08/22/04
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// Modified: 12/21/04
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#ifndef __HOS_VFS_H__
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#define __HOS_VFS_H__ __HOS_VFS_H__
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#include "hos_defines.h"
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#include "fs/devices.h"
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#define FS_EXT2 1
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#define VFS_MAX_FS 10
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/* Structure to hold information about a mount point */
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typedef struct
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{
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int refs;
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void *super;
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major_t major;
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minor_t minor;
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} vfs_mount_t;
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/* Every filesystem must provide pointers to its respective functions in a structure like this */
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typedef struct
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{
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void *(*mount_super)(major_t major, minor_t minor);
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int (*mkfs)(major_t major, minor_t minor);
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} vfs_fs_t;
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/* This structure represents a node of the "VFS Mount Tree" */
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struct vfs_node_s
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{
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char chr; // the character we are at
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vfs_mount_t *mount; // is there a mount at this character?
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struct vfs_node_s *up; // the parent
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struct vfs_node_s *next; // the next sibling
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struct vfs_node_s *down; // subtree for submounts
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};
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typedef struct vfs_node_s vfs_node_t;
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/* This structure is generated when a path is matched. For example, if /dev is mounted on
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device (4,2) and '/dev/yoda' is looked up, the structure returned would be
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{4, 2, 4} and then the lookup could continue on device (4,2) with 4 characters stripped
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off the front of the initial path (ex '/yoda') */
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typedef struct
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{
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vfs_mount_t *mount;
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int length;
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} vfs_mount_match_t;
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int vfs_init();
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int vfs_mount(major_t maj, minor_t min, int fsType, char *mountPoint);
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int vfs_register_fs(int fsn, vfs_fs_t *fs);
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int vfs_add_mount(vfs_mount_t *mnt, char *mountPoint);
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vfs_mount_t *vfs_find_mount(char *mountPoint);
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vfs_mount_match_t vfs_get_rel_path(char *path);
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int vfs_umount(char *mountPoint);
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int vfs_retire_node(vfs_node_t *node);
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void vfs_dump_tree();
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void vfs_dump_node(vfs_node_t *node, int level);
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#endif
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