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pipefs: prepare pipefs_open for named pipe support

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Matheus
2024-08-11 12:25:17 -03:00
parent ca2ad66dc6
commit f02a63473f
3 changed files with 62 additions and 18 deletions
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kernel-src/fs/pipefs.c
+59 -17
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@@ -17,23 +17,6 @@ static uintmax_t currentinode;
static vops_t vnops;
int pipefs_open(vnode_t **node, int flags, cred_t *cred) {
VOP_LOCK(*node);
pipenode_t *pipenode = (pipenode_t *)(*node);
if (flags & V_FFLAGS_READ) {
++pipenode->readers;
}
if (flags & V_FFLAGS_WRITE) {
++pipenode->writers;
}
VOP_UNLOCK(*node);
return 0;
}
int pipefs_close(vnode_t *node, int flags, cred_t *cred) {
VOP_LOCK(node);
pipenode_t *pipenode = (pipenode_t *)node;
@@ -56,6 +39,64 @@ int pipefs_close(vnode_t *node, int flags, cred_t *cred) {
return 0;
}
int pipefs_open(vnode_t **node, int flags, cred_t *cred) {
if ((flags & (V_FFLAGS_WRITE | V_FFLAGS_READ)) == 0)
return EINVAL;
VOP_LOCK(*node);
pipenode_t *pipenode = (pipenode_t *)(*node);
if (flags & V_FFLAGS_READ) {
++pipenode->readers;
}
if (flags & V_FFLAGS_WRITE) {
++pipenode->writers;
}
int error = 0;
if (pipenode->writers > 0 && pipenode->readers > 0)
goto leave;
if (flags & V_FFLAGS_NONBLOCKING) {
if (flags & V_FFLAGS_READ) {
goto leave;
} else if (flags & V_FFLAGS_WRITE) {
error = ENXIO;
goto leave;
}
}
// from this point on, flags has only one of V_FFLAGS_READ or V_FFLAGS_WRITE
// and there are either no writers or no readers.
eventlistener_t listener;
EVENT_INITLISTENER(&listener);
EVENT_ATTACH(&listener, &pipenode->openevent);
while (1) {
VOP_UNLOCK(*node);
error = EVENT_WAIT(&listener, 0);
VOP_LOCK(*node);
if (error || (pipenode->writers > 0 && pipenode->readers > 0))
break;
}
EVENT_DETACHALL(&listener);
leave:
if (error) {
VOP_UNLOCK(*node);
pipefs_close(*node, flags, cred);
} else {
EVENT_SIGNAL(&pipenode->openevent);
VOP_UNLOCK(*node);
}
return error;
}
// TODO for pipefs_read and pipefs_write, the return actually depends on how much data is in the pipe
static int internalpoll(vnode_t *node, polldata_t *data, int events) {
pipenode_t *pipenode = (pipenode_t *)node;
@@ -333,6 +374,7 @@ static void ctor(scache_t *cache, void *obj) {
VOP_INIT(&node->vnode, &vnops, 0, V_TYPE_FIFO, NULL);
node->attr.inode = ++currentinode;
POLL_INITHEADER(&node->pollheader);
EVENT_INITHEADER(&node->openevent);
}
void pipefs_init() {