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This commit is contained in:
Simon Gardling
2024-09-10 13:03:02 -04:00
parent 53c617d779
commit d66450e427
381 changed files with 28864 additions and 34170 deletions
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176
kern/vfs/vnode.c
View File

@@ -40,50 +40,43 @@
/*
* Initialize an abstract vnode.
*/
int
vnode_init(struct vnode *vn, const struct vnode_ops *ops,
struct fs *fs, void *fsdata)
{
KASSERT(vn != NULL);
KASSERT(ops != NULL);
int vnode_init(struct vnode *vn, const struct vnode_ops *ops, struct fs *fs,
void *fsdata) {
KASSERT(vn != NULL);
KASSERT(ops != NULL);
vn->vn_ops = ops;
vn->vn_refcount = 1;
spinlock_init(&vn->vn_countlock);
vn->vn_fs = fs;
vn->vn_data = fsdata;
return 0;
vn->vn_ops = ops;
vn->vn_refcount = 1;
spinlock_init(&vn->vn_countlock);
vn->vn_fs = fs;
vn->vn_data = fsdata;
return 0;
}
/*
* Destroy an abstract vnode.
*/
void
vnode_cleanup(struct vnode *vn)
{
KASSERT(vn->vn_refcount == 1);
void vnode_cleanup(struct vnode *vn) {
KASSERT(vn->vn_refcount == 1);
spinlock_cleanup(&vn->vn_countlock);
spinlock_cleanup(&vn->vn_countlock);
vn->vn_ops = NULL;
vn->vn_refcount = 0;
vn->vn_fs = NULL;
vn->vn_data = NULL;
vn->vn_ops = NULL;
vn->vn_refcount = 0;
vn->vn_fs = NULL;
vn->vn_data = NULL;
}
/*
* Increment refcount.
* Called by VOP_INCREF.
*/
void
vnode_incref(struct vnode *vn)
{
KASSERT(vn != NULL);
void vnode_incref(struct vnode *vn) {
KASSERT(vn != NULL);
spinlock_acquire(&vn->vn_countlock);
vn->vn_refcount++;
spinlock_release(&vn->vn_countlock);
spinlock_acquire(&vn->vn_countlock);
vn->vn_refcount++;
spinlock_release(&vn->vn_countlock);
}
/*
@@ -91,88 +84,79 @@ vnode_incref(struct vnode *vn)
* Called by VOP_DECREF.
* Calls VOP_RECLAIM if the refcount hits zero.
*/
void
vnode_decref(struct vnode *vn)
{
bool destroy;
int result;
void vnode_decref(struct vnode *vn) {
bool destroy;
int result;
KASSERT(vn != NULL);
KASSERT(vn != NULL);
spinlock_acquire(&vn->vn_countlock);
spinlock_acquire(&vn->vn_countlock);
KASSERT(vn->vn_refcount > 0);
if (vn->vn_refcount > 1) {
vn->vn_refcount--;
destroy = false;
}
else {
/* Don't decrement; pass the reference to VOP_RECLAIM. */
destroy = true;
}
spinlock_release(&vn->vn_countlock);
KASSERT(vn->vn_refcount > 0);
if (vn->vn_refcount > 1) {
vn->vn_refcount--;
destroy = false;
} else {
/* Don't decrement; pass the reference to VOP_RECLAIM. */
destroy = true;
}
spinlock_release(&vn->vn_countlock);
if (destroy) {
result = VOP_RECLAIM(vn);
if (result != 0 && result != EBUSY) {
// XXX: lame.
kprintf("vfs: Warning: VOP_RECLAIM: %s\n",
strerror(result));
}
}
if (destroy) {
result = VOP_RECLAIM(vn);
if (result != 0 && result != EBUSY) {
// XXX: lame.
kprintf("vfs: Warning: VOP_RECLAIM: %s\n", strerror(result));
}
}
}
/*
* Check for various things being valid.
* Called before all VOP_* calls.
*/
void
vnode_check(struct vnode *v, const char *opstr)
{
/* not safe, and not really needed to check constant fields */
/*vfs_biglock_acquire();*/
void vnode_check(struct vnode *v, const char *opstr) {
/* not safe, and not really needed to check constant fields */
/*vfs_biglock_acquire();*/
if (v == NULL) {
panic("vnode_check: vop_%s: null vnode\n", opstr);
}
if (v == (void *)0xdeadbeef) {
panic("vnode_check: vop_%s: deadbeef vnode\n", opstr);
}
if (v == NULL) {
panic("vnode_check: vop_%s: null vnode\n", opstr);
}
if (v == (void *)0xdeadbeef) {
panic("vnode_check: vop_%s: deadbeef vnode\n", opstr);
}
if (v->vn_ops == NULL) {
panic("vnode_check: vop_%s: null ops pointer\n", opstr);
}
if (v->vn_ops == (void *)0xdeadbeef) {
panic("vnode_check: vop_%s: deadbeef ops pointer\n", opstr);
}
if (v->vn_ops == NULL) {
panic("vnode_check: vop_%s: null ops pointer\n", opstr);
}
if (v->vn_ops == (void *)0xdeadbeef) {
panic("vnode_check: vop_%s: deadbeef ops pointer\n", opstr);
}
if (v->vn_ops->vop_magic != VOP_MAGIC) {
panic("vnode_check: vop_%s: ops with bad magic number %lx\n",
opstr, v->vn_ops->vop_magic);
}
if (v->vn_ops->vop_magic != VOP_MAGIC) {
panic("vnode_check: vop_%s: ops with bad magic number %lx\n", opstr,
v->vn_ops->vop_magic);
}
// Device vnodes have null fs pointers.
//if (v->vn_fs == NULL) {
// panic("vnode_check: vop_%s: null fs pointer\n", opstr);
//}
if (v->vn_fs == (void *)0xdeadbeef) {
panic("vnode_check: vop_%s: deadbeef fs pointer\n", opstr);
}
// Device vnodes have null fs pointers.
// if (v->vn_fs == NULL) {
// panic("vnode_check: vop_%s: null fs pointer\n", opstr);
//}
if (v->vn_fs == (void *)0xdeadbeef) {
panic("vnode_check: vop_%s: deadbeef fs pointer\n", opstr);
}
spinlock_acquire(&v->vn_countlock);
spinlock_acquire(&v->vn_countlock);
if (v->vn_refcount < 0) {
panic("vnode_check: vop_%s: negative refcount %d\n", opstr,
v->vn_refcount);
}
else if (v->vn_refcount == 0) {
panic("vnode_check: vop_%s: zero refcount\n", opstr);
}
else if (v->vn_refcount > 0x100000) {
kprintf("vnode_check: vop_%s: warning: large refcount %d\n",
opstr, v->vn_refcount);
}
if (v->vn_refcount < 0) {
panic("vnode_check: vop_%s: negative refcount %d\n", opstr, v->vn_refcount);
} else if (v->vn_refcount == 0) {
panic("vnode_check: vop_%s: zero refcount\n", opstr);
} else if (v->vn_refcount > 0x100000) {
kprintf("vnode_check: vop_%s: warning: large refcount %d\n", opstr,
v->vn_refcount);
}
spinlock_release(&v->vn_countlock);
/*vfs_biglock_release();*/
spinlock_release(&v->vn_countlock);
/*vfs_biglock_release();*/
}