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vfs: leave handling of VOP_LOCK and VOP_UNLOCK to each filesystem

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Matheus
2024-08-26 18:45:17 -03:00
parent 6066dc86ab
commit da150523ba
6 changed files with 133 additions and 55 deletions
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kernel-src/fs/sockfs.c
+22 -6
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@@ -12,6 +12,9 @@
static scache_t *nodecache;
static uintmax_t currentinode;
#define INTERNAL_LOCK(v) MUTEX_ACQUIRE(&(v)->lock, false)
#define INTERNAL_UNLOCK(v) MUTEX_RELEASE(&(v)->lock)
int sockfs_open(vnode_t **node, int flags, cred_t *cred) {
return ENOSYS; // not needed
}
@@ -38,17 +41,17 @@ int sockfs_poll(vnode_t *node, polldata_t *data, int events) {
int sockfs_getattr(vnode_t *node, vattr_t *attr, cred_t *cred) {
socketnode_t *socketnode = (socketnode_t *)node;
VOP_LOCK(node);
INTERNAL_LOCK(node);
*attr = socketnode->attr;
attr->type = node->type;
VOP_UNLOCK(node);
INTERNAL_UNLOCK(node);
return 0;
}
int sockfs_setattr(vnode_t *node, vattr_t *attr, int which, cred_t *cred) {
socketnode_t *socketnode = (socketnode_t *)node;
VOP_LOCK(node);
INTERNAL_LOCK(node);
if (which & V_ATTR_GID)
socketnode->attr.gid = attr->gid;
@@ -63,7 +66,7 @@ int sockfs_setattr(vnode_t *node, vattr_t *attr, int which, cred_t *cred) {
if (which & V_ATTR_CTIME)
socketnode->attr.ctime = attr->ctime;
VOP_UNLOCK(node);
INTERNAL_UNLOCK(node);
return 0;
}
@@ -167,12 +170,23 @@ int sockfs_ioctl(vnode_t *node, unsigned long request, void *arg, int *result) {
int sockfs_inactive(vnode_t *node) {
socket_t *socket = SOCKFS_SOCKET_FROM_NODE(node);
VOP_LOCK(node);
INTERNAL_LOCK(node);
socket->ops->destroy(socket);
slab_free(nodecache, node);
return 0;
}
// the mutex vnode is handled internally
// (as we can sleep when waiting for data/space, and the handling happens in the socket layer)
// this does mean that operations are not atomic between a INTERNAL_LOCK and INTERNAL_UNLOCK
static int sockfs_lock(vnode_t *) {
return 0;
}
static int sockfs_unlock(vnode_t *) {
return 0;
}
static int sockfs_enodev() {
return ENODEV;
}
@@ -201,7 +215,9 @@ static vops_t vnops = {
.ioctl = sockfs_ioctl,
.putpage = sockfs_enodev,
.getpage = sockfs_enodev,
.sync = sockfs_enodev
.sync = sockfs_enodev,
.lock = sockfs_lock,
.unlock = sockfs_unlock
};
static void ctor(scache_t *cache, void *obj) {