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hw/9pfs: Add yeild support for readlink

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Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2011-08-08 23:33:48 +05:30 committed by Aneesh Kumar K.V
parent ff06030f66
commit 86e42d7482
3 changed files with 46 additions and 1 deletions
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2
Makefile.objs
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@ -305,7 +305,7 @@ hw-obj-$(CONFIG_SOUND) += $(sound-obj-y)
9pfs-nested-$(CONFIG_VIRTFS) = virtio-9p.o virtio-9p-debug.o
9pfs-nested-$(CONFIG_VIRTFS) += virtio-9p-local.o virtio-9p-xattr.o
9pfs-nested-$(CONFIG_VIRTFS) += virtio-9p-xattr-user.o virtio-9p-posix-acl.o
9pfs-nested-$(CONFIG_VIRTFS) += virtio-9p-coth.o
9pfs-nested-$(CONFIG_VIRTFS) += virtio-9p-coth.o cofs.o
hw-obj-$(CONFIG_REALLY_VIRTFS) += $(addprefix 9pfs/, $(9pfs-nested-y))
$(addprefix 9pfs/, $(9pfs-nested-y)): QEMU_CFLAGS+=$(GLIB_CFLAGS)

44
hw/9pfs/cofs.c Normal file
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@ -0,0 +1,44 @@
/*
* Virtio 9p backend
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "fsdev/qemu-fsdev.h"
#include "qemu-thread.h"
#include "qemu-coroutine.h"
#include "virtio-9p-coth.h"
int v9fs_co_readlink(V9fsState *s, V9fsString *path, V9fsString *buf)
{
int err;
ssize_t len;
buf->data = qemu_malloc(PATH_MAX);
v9fs_co_run_in_worker(
{
len = s->ops->readlink(&s->ctx, path->data,
buf->data, PATH_MAX - 1);
if (len > -1) {
buf->size = len;
buf->data[len] = 0;
err = 0;
} else {
err = -errno;
}
});
if (err) {
qemu_free(buf->data);
buf->data = NULL;
buf->size = 0;
}
return err;
}

1
hw/9pfs/virtio-9p-coth.h
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@ -56,4 +56,5 @@ typedef struct V9fsThPool {
extern void co_run_in_worker_bh(void *);
extern int v9fs_init_worker_threads(void);
extern int v9fs_co_readlink(V9fsState *, V9fsString *, V9fsString *);
#endif