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devfs: support directories inside it

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Matheus
2024-04-25 20:56:47 -03:00
parent 7974373cbb
commit b61ffafc0c
2 changed files with 50 additions and 32 deletions
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kernel-src/fs/devfs.c
+48 -32
View File
@@ -11,7 +11,6 @@ static devnode_t *devfsroot;
static mutex_t tablelock;
static hashtable_t devtable;
static hashtable_t nametable;
static scache_t *nodecache;
static uintmax_t currentinode;
@@ -89,13 +88,14 @@ int devfs_write(vnode_t *node, void *buffer, size_t size, uintmax_t offset, int
}
int devfs_lookup(vnode_t *node, char *name, vnode_t **result, cred_t *cred) {
if (node != (vnode_t *)devfsroot)
return EINVAL;
devnode_t *devnode = (devnode_t *)node;
if (node->type != V_TYPE_DIR)
return ENOTDIR;
void *v;
VOP_LOCK(node);
MUTEX_ACQUIRE(&tablelock, false);
int error = hashtable_get(&nametable, &v, name, strlen(name));
int error = hashtable_get(&devnode->children, &v, name, strlen(name));
MUTEX_RELEASE(&tablelock);
if (error) {
VOP_UNLOCK(node);
@@ -115,7 +115,7 @@ int devfs_getattr(vnode_t *node, vattr_t *attr, cred_t *cred) {
if (devnode->physical && devnode->physical != node) {
VOP_LOCK(devnode->physical);
int err = VOP_SETATTR(devnode->physical, attr, cred);
int err = VOP_GETATTR(devnode->physical, attr, cred);
VOP_UNLOCK(devnode->physical);
return err;
}
@@ -132,7 +132,7 @@ int devfs_setattr(vnode_t *node, vattr_t *attr, cred_t *cred) {
devnode_t *devnode = (devnode_t *)node;
if (devnode->physical && devnode->physical != node) {
int err = VOP_GETATTR(devnode->physical, attr, cred);
int err = VOP_SETATTR(devnode->physical, attr, cred);
return err;
}
@@ -222,13 +222,15 @@ int devfs_inactive(vnode_t *node) {
}
int devfs_create(vnode_t *parent, char *name, vattr_t *attr, int type, vnode_t **result, cred_t *cred) {
if (parent != (vnode_t *)devfsroot || (type != V_TYPE_CHDEV && type != V_TYPE_BLKDEV))
if (type != V_TYPE_CHDEV && type != V_TYPE_BLKDEV && type != V_TYPE_DIR)
return EINVAL;
devnode_t *parentdevnode = (devnode_t *)parent;
size_t namelen = strlen(name);
void *v;
VOP_LOCK(parent);
if (hashtable_get(&nametable, &v, name, namelen) == 0) {
if (hashtable_get(&parentdevnode->children, &v, name, namelen) == 0) {
VOP_UNLOCK(parent);
return EEXIST;
}
@@ -253,13 +255,34 @@ int devfs_create(vnode_t *parent, char *name, vattr_t *attr, int type, vnode_t *
node->vnode.vfs = parent->vfs;
node->vnode.type = type;
int error = hashtable_set(&nametable, node, name, namelen, true);
if (type == V_TYPE_DIR) {
int error = hashtable_init(&node->children, 100);
if (error) {
slab_free(nodecache, node);
VOP_UNLOCK(parent);
return error;
}
if (hashtable_set(&node->children, node, ".", 1, true) || hashtable_set(&node->children, parent, "..", 2, true)) {
hashtable_destroy(&node->children);
slab_free(nodecache, node);
VOP_UNLOCK(parent);
return error;
}
}
int error = hashtable_set(&parentdevnode->children, node, name, namelen, true);
if (error) {
if (type == V_TYPE_DIR)
hashtable_destroy(&node->children);
VOP_UNLOCK(parent);
slab_free(nodecache, node);
return error;
}
// held here to reduce cleanup
if (type == V_TYPE_DIR)
VOP_HOLD(parent);
VOP_HOLD(&node->vnode);
VOP_UNLOCK(parent);
*result = &node->vnode;
@@ -268,8 +291,8 @@ int devfs_create(vnode_t *parent, char *name, vattr_t *attr, int type, vnode_t *
}
static int devfs_getdents(vnode_t *node, dent_t *buffer, size_t count, uintmax_t offset, size_t *readcount) {
if (node != (vnode_t *)devfsroot)
return EINVAL;
if (node->type != V_TYPE_DIR)
return ENOTDIR;
VOP_LOCK(node);
@@ -278,7 +301,7 @@ static int devfs_getdents(vnode_t *node, dent_t *buffer, size_t count, uintmax_t
*readcount = 0;
size_t current = 0;
HASHTABLE_FOREACH(&nametable) {
HASHTABLE_FOREACH(&devnode->children) {
if (current < offset) {
++current;
continue;
@@ -287,12 +310,14 @@ static int devfs_getdents(vnode_t *node, dent_t *buffer, size_t count, uintmax_t
if (*readcount == count)
break;
devnode_t *currnode = entry->value;
dent_t *ent = &buffer[*readcount];
ent->d_ino = devnode->attr.inode;
ent->d_ino = currnode->attr.inode;
ent->d_off = offset;
ent->d_reclen = sizeof(dent_t);
ent->d_type = vfs_getposixtype(node->type);
ent->d_type = vfs_getposixtype(currnode->vnode.type);
strcpy(ent->d_name, entry->key);
*readcount += 1;
@@ -313,12 +338,12 @@ static vfsops_t vfsops = {
};
static vops_t vnops = {
.create = devfs_create,
.create = devfs_create, // this
.open = devfs_open,
.close = devfs_close,
.getattr = devfs_getattr,
.setattr = devfs_setattr,
.lookup = devfs_lookup,
.lookup = devfs_lookup, // this
.poll = devfs_poll,
.read = devfs_read,
.write = devfs_write,
@@ -327,11 +352,11 @@ static vops_t vnops = {
.link = devfs_enodev,
.symlink = devfs_enodev,
.readlink = devfs_enodev,
.inactive = devfs_enodev,
.inactive = devfs_enodev, // this
.mmap = devfs_mmap,
.munmap = devfs_munmap,
.getdents = devfs_getdents,
.isatty = devfs_isatty,
.getdents = devfs_getdents, // this
.isatty = devfs_isatty,
.ioctl = devfs_ioctl,
.maxseek = devfs_maxseek,
.resize = devfs_enodev,
@@ -347,7 +372,6 @@ static void ctor(scache_t *cache, void *obj) {
void devfs_init() {
__assert(hashtable_init(&devtable, 50) == 0);
__assert(hashtable_init(&nametable, 50) == 0);
nodecache = slab_newcache(sizeof(devnode_t), 0, ctor, ctor);
MUTEX_INIT(&tablelock);
__assert(nodecache);
@@ -356,25 +380,17 @@ void devfs_init() {
__assert(devfsroot);
devfsroot->vnode.type = V_TYPE_DIR;
devfsroot->vnode.flags = V_FLAGS_ROOT;
__assert(hashtable_init(&devfsroot->children, 100) == 0);
__assert(vfs_register(&vfsops, "devfs") == 0);
__assert(hashtable_set(&nametable, devfsroot, ".", 1, true) == 0);
__assert(hashtable_set(&devfsroot->children, devfsroot, ".", 1, true) == 0);
}
int devfs_getbyname(char *name, vnode_t **ret) {
void *v;
MUTEX_ACQUIRE(&tablelock, false);
int error = hashtable_get(&nametable, &v, name, strlen(name));
int error = vfs_lookup(ret, (vnode_t *)devfsroot, name, NULL, 0);
if (error)
goto cleanup;
vnode_t *node = v;
VOP_HOLD(node);
*ret = node;
cleanup:
MUTEX_RELEASE(&tablelock);
return error;
}
// register new device
@@ -403,6 +419,7 @@ int devfs_register(devops_t *devops, char *name, int type, int major, int minor,
vnode_t *newvnode = NULL;
// the devfs node will have a reference from both the devtable and from the fs link
error = vfs_create((vnode_t *)devfsroot, name, &attr, type, &newvnode);
if (error) {
MUTEX_ACQUIRE(&tablelock, false);
@@ -415,7 +432,6 @@ int devfs_register(devops_t *devops, char *name, int type, int major, int minor,
devnode_t *newdevnode = (devnode_t *)newvnode;
master->attr = newdevnode->attr;
newdevnode->master = master;
VOP_RELEASE(newvnode);
return 0;
}
kernel-src/include/kernel/devfs.h
+2
View File
@@ -4,6 +4,7 @@
#include <kernel/vfs.h>
#include <kernel/poll.h>
#include <hashtable.h>
#define DEV_MAJOR_NULL 1
#define DEV_MAJOR_FULL 2
@@ -36,6 +37,7 @@ typedef struct devnode_t {
devops_t *devops;
vnode_t *physical;
struct devnode_t *master;
hashtable_t children;
} devnode_t;
void devfs_init();