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devfs: ability to remove devices

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Matheus
2024-04-25 21:21:17 -03:00
parent b61ffafc0c
commit 14b641f1bf
1 changed files with 39 additions and 4 deletions
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kernel-src/fs/devfs.c
+39 -4
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@@ -217,6 +217,10 @@ int devfs_inactive(vnode_t *node) {
VOP_RELEASE(devnode->physical);
if (devnode->master)
VOP_RELEASE(master);
if (devnode->devops && devnode->devops->inactive)
devnode->devops->inactive(devnode->attr.rdevminor);
slab_free(nodecache, node);
return 0;
}
@@ -338,12 +342,12 @@ static vfsops_t vfsops = {
};
static vops_t vnops = {
.create = devfs_create, // this
.create = devfs_create,
.open = devfs_open,
.close = devfs_close,
.getattr = devfs_getattr,
.setattr = devfs_setattr,
.lookup = devfs_lookup, // this
.lookup = devfs_lookup,
.poll = devfs_poll,
.read = devfs_read,
.write = devfs_write,
@@ -352,10 +356,10 @@ static vops_t vnops = {
.link = devfs_enodev,
.symlink = devfs_enodev,
.readlink = devfs_enodev,
.inactive = devfs_enodev, // this
.inactive = devfs_enodev,
.mmap = devfs_mmap,
.munmap = devfs_munmap,
.getdents = devfs_getdents, // this
.getdents = devfs_getdents,
.isatty = devfs_isatty,
.ioctl = devfs_ioctl,
.maxseek = devfs_maxseek,
@@ -458,3 +462,34 @@ int devfs_getnode(vnode_t *physical, int major, int minor, vnode_t **node) {
*node = &newnode->vnode;
return 0;
}
void devfs_remove(char *name, int major, int minor) {
int key[2] = {major, minor};
// remove devtable reference
MUTEX_ACQUIRE(&tablelock, false);
__assert(hashtable_remove(&devtable, key, sizeof(key)) == 0);
MUTEX_RELEASE(&tablelock);
// get parent
vnode_t *parent;
char namebuff[100];
__assert(vfs_lookup(&parent, (vnode_t *)devfsroot, name, namebuff, VFS_LOOKUP_PARENT) == 0);
devnode_t *parentdevnode = (devnode_t *)parent;
VOP_LOCK(parent);
// get device vnode
void *tmp;
__assert(hashtable_get(&parentdevnode->children, &tmp, namebuff, strlen(namebuff)) == 0);
vnode_t *vnode = tmp;
devnode_t *node = tmp;
__assert(node->attr.rdevmajor == major && node->attr.rdevminor == minor);
__assert(hashtable_remove(&parentdevnode->children, namebuff, strlen(namebuff)) == 0);
VOP_UNLOCK(parent);
// release all the references to the removed node:
VOP_RELEASE(vnode);
VOP_RELEASE(vnode);
}