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/*
* 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_lstat(V9fsState *s, V9fsPath *path, struct stat *stbuf)
{
int err;
qemu_co_rwlock_rdlock(&s->rename_lock);
v9fs_co_run_in_worker(
{
err = s->ops->lstat(&s->ctx, path, stbuf);
if (err < 0) {
err = -errno;
}
});
qemu_co_rwlock_unlock(&s->rename_lock);
return err;
}
int v9fs_co_fstat(V9fsState *s, int fd, struct stat *stbuf)
{
int err;
v9fs_co_run_in_worker(
{
err = s->ops->fstat(&s->ctx, fd, stbuf);
if (err < 0) {
err = -errno;
}
});
return err;
}
int v9fs_co_open(V9fsState *s, V9fsFidState *fidp, int flags)
{
int err;
qemu_co_rwlock_rdlock(&s->rename_lock);
v9fs_co_run_in_worker(
{
fidp->fs.fd = s->ops->open(&s->ctx, &fidp->path, flags);
if (fidp->fs.fd == -1) {
err = -errno;
} else {
err = 0;
}
});
qemu_co_rwlock_unlock(&s->rename_lock);
if (!err) {
total_open_fd++;
if (total_open_fd > open_fd_hw) {
v9fs_reclaim_fd(s);
}
}
return err;
}
int v9fs_co_open2(V9fsState *s, V9fsFidState *fidp, V9fsString *name, gid_t gid,
int flags, int mode, struct stat *stbuf)
{
int err;
FsCred cred;
V9fsPath path;
cred_init(&cred);
cred.fc_mode = mode & 07777;
cred.fc_uid = fidp->uid;
cred.fc_gid = gid;
/*
* Hold the directory fid lock so that directory path name
* don't change. Read lock is fine because this fid cannot
* be used by any other operation.
*/
qemu_co_rwlock_rdlock(&s->rename_lock);
v9fs_co_run_in_worker(
{
fidp->fs.fd = s->ops->open2(&s->ctx, &fidp->path,
name->data, flags, &cred);
if (fidp->fs.fd == -1) {
err = -errno;
} else {
v9fs_path_init(&path);
err = v9fs_name_to_path(s, &fidp->path, name->data, &path);
if (!err) {
err = s->ops->lstat(&s->ctx, &path, stbuf);
if (err < 0) {
err = -errno;
s->ops->close(&s->ctx, fidp->fs.fd);
} else {
v9fs_path_copy(&fidp->path, &path);
}
} else {
s->ops->close(&s->ctx, fidp->fs.fd);
}
v9fs_path_free(&path);
}
});
qemu_co_rwlock_unlock(&s->rename_lock);
if (!err) {
total_open_fd++;
if (total_open_fd > open_fd_hw) {
v9fs_reclaim_fd(s);
}
}
return err;
}
int v9fs_co_close(V9fsState *s, int fd)
{
int err;
v9fs_co_run_in_worker(
{
err = s->ops->close(&s->ctx, fd);
if (err < 0) {
err = -errno;
}
});
if (!err) {
total_open_fd--;
}
return err;
}
int v9fs_co_fsync(V9fsState *s, V9fsFidState *fidp, int datasync)
{
int fd;
int err;
fd = fidp->fs.fd;
v9fs_co_run_in_worker(
{
err = s->ops->fsync(&s->ctx, fd, datasync);
if (err < 0) {
err = -errno;
}
});
return err;
}
int v9fs_co_link(V9fsState *s, V9fsFidState *oldfid,
V9fsFidState *newdirfid, V9fsString *name)
{
int err;
qemu_co_rwlock_rdlock(&s->rename_lock);
v9fs_co_run_in_worker(
{
err = s->ops->link(&s->ctx, &oldfid->path,
&newdirfid->path, name->data);
if (err < 0) {
err = -errno;
}
});
qemu_co_rwlock_unlock(&s->rename_lock);
return err;
}
int v9fs_co_pwritev(V9fsState *s, V9fsFidState *fidp,
struct iovec *iov, int iovcnt, int64_t offset)
{
int fd;
int err;
fd = fidp->fs.fd;
v9fs_co_run_in_worker(
{
err = s->ops->pwritev(&s->ctx, fd, iov, iovcnt, offset);
if (err < 0) {
err = -errno;
}
});
return err;
}
int v9fs_co_preadv(V9fsState *s, V9fsFidState *fidp,
struct iovec *iov, int iovcnt, int64_t offset)
{
int fd;
int err;
fd = fidp->fs.fd;
v9fs_co_run_in_worker(
{
err = s->ops->preadv(&s->ctx, fd, iov, iovcnt, offset);
if (err < 0) {
err = -errno;
}
});
return err;
}
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