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Redesign VFS around handles

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This commit is contained in:
Kamil Kowalczyk
2026-02-22 13:57:41 +01:00
parent b571e2dbd3
commit 85872b856b
10 changed files with 210 additions and 196 deletions
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165
kernel/fs/vfs.c
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@@ -46,7 +46,6 @@ int vfs_create_mountpoint (const char* key, int fs_type, struct device* back_dev
memcpy (mountpoint->key, key, strlen_null (key));
mountpoint->fs_type = fs_type;
mountpoint->lock = SPIN_LOCK_INIT;
mountpoint->back_device = back_device;
switch (mountpoint->fs_type) {
@@ -81,111 +80,137 @@ int vfs_create_mountpoint (const char* key, int fs_type, struct device* back_dev
}
int vfs_open (struct procgroup* procgroup, const char* mountpoint, const char* path) {
(void)path;
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
if (vmp == NULL)
return -ST_NOT_FOUND;
spin_lock (&vmp->lock);
struct vfs_handle* handle = malloc (sizeof (*handle));
vmp->ownerpg = procgroup;
vmp->locked = true;
if (handle == NULL)
return -ST_OOM_ERROR;
spin_unlock (&vmp->lock);
memset (handle, 0, sizeof (*handle));
handle->mountpoint = vmp;
handle->ownerpg = procgroup;
strncpy (handle->path, path, sizeof (handle->path));
spin_lock (&procgroup->lock);
int id = handle->id = procgroup->sys_vfs_handles++;
rbtree_insert (struct vfs_handle, &procgroup->vfs_handle_tree, &handle->handle_tree_link,
handle_tree_link, id);
spin_unlock (&procgroup->lock);
return id;
}
int vfs_close (struct procgroup* procgroup, int id) {
struct vfs_handle* handle = NULL;
spin_lock (&procgroup->lock);
rbtree_find (struct vfs_handle, &procgroup->vfs_handle_tree, id, handle, handle_tree_link, id);
if (handle == NULL) {
spin_unlock (&procgroup->lock);
return -ST_NOT_FOUND;
}
rbtree_delete (&procgroup->vfs_handle_tree, &handle->handle_tree_link);
spin_unlock (&procgroup->lock);
free (handle);
return ST_OK;
}
int vfs_close (struct procgroup* procgroup, const char* mountpoint, const char* path) {
(void)path;
int vfs_describe (struct procgroup* procgroup, int id, struct desc* desc) {
struct vfs_handle* handle = NULL;
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
spin_lock (&procgroup->lock);
if (vmp == NULL)
rbtree_find (struct vfs_handle, &procgroup->vfs_handle_tree, id, handle, handle_tree_link, id);
if (handle == NULL) {
spin_unlock (&procgroup->lock);
return -ST_NOT_FOUND;
spin_lock (&vmp->lock);
if (procgroup != NULL && vmp->ownerpg != procgroup) {
spin_unlock (&vmp->lock);
return -ST_PERMISSION_ERROR;
}
vmp->locked = false;
vmp->ownerpg = NULL;
spin_unlock (&procgroup->lock);
spin_unlock (&vmp->lock);
return ST_OK;
}
int vfs_describe (struct procgroup* procgroup, const char* mountpoint, const char* path,
struct desc* desc) {
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
if (vmp == NULL)
return -ST_NOT_FOUND;
spin_lock (&vmp->lock);
if ((procgroup != NULL && vmp->ownerpg != procgroup) && vmp->locked) {
spin_unlock (&vmp->lock);
return -ST_PERMISSION_ERROR;
}
int ret = vmp->driver_ops.describe (vmp, path, desc);
spin_unlock (&vmp->lock);
spin_lock (&handle->lock);
int ret = handle->mountpoint->driver_ops.describe (handle->mountpoint, handle->path, desc);
spin_unlock (&handle->lock);
return ret;
}
int vfs_read (struct procgroup* procgroup, const char* mountpoint, const char* path,
uint8_t* buffer, size_t off, size_t size) {
int vfs_read (struct procgroup* procgroup, int id, uint8_t* buffer, size_t off, size_t size) {
struct vfs_handle* handle = NULL;
spin_lock (&procgroup->lock);
rbtree_find (struct vfs_handle, &procgroup->vfs_handle_tree, id, handle, handle_tree_link, id);
if (handle == NULL) {
spin_unlock (&procgroup->lock);
return -ST_NOT_FOUND;
}
spin_unlock (&procgroup->lock);
spin_lock (&handle->lock);
int ret =
handle->mountpoint->driver_ops.read (handle->mountpoint, handle->path, buffer, off, size);
spin_unlock (&handle->lock);
return ret;
}
int vfs_kernel_read (const char* mountpoint, const char* path, uint8_t* buffer, size_t off,
size_t size) {
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
if (vmp == NULL)
return -ST_NOT_FOUND;
spin_lock (&vmp->lock);
return vmp->driver_ops.read (vmp, path, buffer, off, size);
}
if ((procgroup != NULL && vmp->ownerpg != procgroup) && vmp->locked) {
spin_unlock (&vmp->lock);
return -ST_PERMISSION_ERROR;
}
int vfs_kernel_describe (const char* mountpoint, const char* path, struct desc* desc) {
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
int ret = vmp->driver_ops.read (vmp, path, buffer, off, size);
if (vmp == NULL)
return -ST_NOT_FOUND;
spin_unlock (&vmp->lock);
return ret;
return vmp->driver_ops.describe (vmp, path, desc);
}
void vfs_procgroup_cleanup (struct procgroup* procgroup) {
spin_lock (&mount_table.lock);
struct list_node_link* handle_cleanup_list = NULL;
struct vfs_handle* handle;
for (size_t i = 0; i < lengthof (mount_table.mountpoint_buckets); i++) {
struct hash_node_link* link = mount_table.mountpoint_buckets[i];
struct rb_node_link* node;
rbtree_first (&procgroup->vfs_handle_tree, node);
while (link != NULL) {
struct vfs_mountpoint* vmp = hash_entry (link, struct vfs_mountpoint, mount_table_link);
spin_lock (&vmp->lock);
if (vmp->ownerpg == procgroup) {
vmp->locked = false;
vmp->ownerpg = NULL;
}
spin_unlock (&vmp->lock);
link = link->next;
}
while (node != NULL) {
struct rb_node_link* next;
rbtree_next (node, next);
handle = rbtree_entry (node, struct vfs_handle, handle_tree_link);
node = next;
list_append (handle_cleanup_list, &handle->handle_cleanup_link);
}
spin_unlock (&mount_table.lock);
struct list_node_link *cleanup_link, *cleanup_tmp_link;
list_foreach (handle_cleanup_list, cleanup_link, cleanup_tmp_link) {
handle = list_entry (cleanup_link, struct vfs_handle, handle_cleanup_link);
list_remove (handle_cleanup_list, &handle->handle_cleanup_link);
free (handle);
}
}
void vfs_init (void) {