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9pfs: split out fs driver core of v9fs_co_readdir() 

The implementation of v9fs_co_readdir() has two parts: the outer
part is executed by main I/O thread, whereas the inner part is
executed by fs driver on a background I/O thread.

Move the inner part to its own new, private function do_readdir(),
so it can be shared by another upcoming new function.

This is just a preparatory patch for the subsequent patch, with the
purpose to avoid the next patch to clutter the overall diff.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <a426ee06e77584fa2d8253ce5d8bea519eb3ffd4.1596012787.git.qemu_oss@crudebyte.com>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
This commit is contained in:
Christian Schoenebeck 2020-07-29 10:11:54 +02:00
parent 29c9d2ca80
commit dd8151f4fe
1 changed files with 24 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
hw/9pfs/codir.c
View File

@ -18,28 +18,38 @@
#include "qemu/main-loop.h"
#include "coth.h"
/*
* Intended to be called from bottom-half (e.g. background I/O thread)
* context.
*/
static int do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, struct dirent **dent)
{
int err = 0;
V9fsState *s = pdu->s;
struct dirent *entry;
errno = 0;
entry = s->ops->readdir(&s->ctx, &fidp->fs);
if (!entry && errno) {
*dent = NULL;
err = -errno;
} else {
*dent = entry;
}
return err;
}
int coroutine_fn v9fs_co_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
struct dirent **dent)
{
int err;
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
v9fs_co_run_in_worker(
{
struct dirent *entry;
errno = 0;
entry = s->ops->readdir(&s->ctx, &fidp->fs);
if (!entry && errno) {
err = -errno;
} else {
*dent = entry;
err = 0;
}
});
v9fs_co_run_in_worker({
err = do_readdir(pdu, fidp, dent);
});
return err;
}