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ba0e3ada21
Boot files and tasks are now initialised together. Theads can ask for particular space and thread ids, if they're unused. This enables us to get predefined ids for known tasks such as the VFS task. Fixes to README Other minor fixes.
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
#ifndef __VFS_H__
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#define __VFS_H__
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#include <fs.h>
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#include <lib/malloc.h>
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#include <l4/lib/list.h>
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#include <memfs/memfs.h>
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/*
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* FIXME:
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* These ought to be strings and split/comparison functions should
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* always use strings because formats like UTF-8 wouldn't work.
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*/
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#define VFS_STR_SEP '/'
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#define VFS_STR_PARDIR ".."
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#define VFS_STR_CURDIR "."
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#define VFS_STR_XATDIR "...."
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/*
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* This is a temporary replacement for page cache support provided by mm0.
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* Normally mm0 tracks all vnode pages, but this is used to track pages in
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* directory vnodes, which are normally never mapped by tasks.
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*/
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extern struct memfs_superblock *memfs_superblock;
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static inline void *vfs_alloc_dirpage(void)
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{
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/*
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* Urgh, we allocate from the block cache of memfs to store generic vfs directory
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* pages. This is currently the quickest we can allocate page-aligned memory.
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*/
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return memfs_alloc_block(memfs_superblock);
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}
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static inline void vfs_free_dirpage(void *block)
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{
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memfs_free_block(memfs_superblock, block);
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}
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static inline struct dentry *vfs_alloc_dentry(void)
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{
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struct dentry *d = kzalloc(sizeof(struct dentry));
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INIT_LIST_HEAD(&d->child);
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INIT_LIST_HEAD(&d->children);
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INIT_LIST_HEAD(&d->vref);
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return d;
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}
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static inline void vfs_free_dentry(struct dentry *d)
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{
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return kfree(d);
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}
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static inline struct vnode *vfs_alloc_vnode(void)
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{
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struct vnode *v = kzalloc(sizeof(struct vnode));
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INIT_LIST_HEAD(&v->dentries);
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INIT_LIST_HEAD(&v->state_list);
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return v;
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}
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static inline void vfs_free_vnode(struct vnode *v)
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{
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kfree(v);
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}
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static inline struct superblock *vfs_alloc_superblock(void)
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{
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struct superblock *sb = kmalloc(sizeof(struct superblock));
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INIT_LIST_HEAD(&sb->list);
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return sb;
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}
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struct vfs_mountpoint {
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struct superblock *sb; /* The superblock of mounted filesystem */
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struct vnode *pivot; /* The dentry upon which we mount */
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};
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extern struct vfs_mountpoint vfs_root;
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int vfs_mount_root(struct superblock *sb);
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struct vnode *generic_vnode_lookup(struct vnode *thisnode, char *path);
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struct vnode *vfs_lookup(struct superblock *sb, char *path);
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#endif /* __VFS_H__ */
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