--- /dev/null
+
+/*
+ * 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 "block/coroutine.h"
+#include "virtio-9p-coth.h"
+
+int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t st_mode,
+ V9fsStatDotl *v9stat)
+{
+ int err = 0;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ if (s->ctx.exops.get_st_gen) {
+ v9fs_path_read_lock(s);
+ v9fs_co_run_in_worker(
+ {
+ err = s->ctx.exops.get_st_gen(&s->ctx, path, st_mode,
+ &v9stat->st_gen);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ v9fs_path_unlock(s);
+ }
+ return err;
+}
+
+int v9fs_co_lstat(V9fsPDU *pdu, V9fsPath *path, struct stat *stbuf)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_path_read_lock(s);
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->lstat(&s->ctx, path, stbuf);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ v9fs_path_unlock(s);
+ return err;
+}
+
+int v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, struct stat *stbuf)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->fstat(&s->ctx, fidp->fid_type, &fidp->fs, stbuf);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ /*
+ * Some FS driver (local:mapped-file) can't support fetching attributes
+ * using file descriptor. Use Path name in that case.
+ */
+ if (err == -EOPNOTSUPP) {
+ err = v9fs_co_lstat(pdu, &fidp->path, stbuf);
+ if (err == -ENOENT) {
+ /*
+ * fstat on an unlinked file. Work with partial results
+ * returned from s->ops->fstat
+ */
+ err = 0;
+ }
+ }
+ return err;
+}
+
+int v9fs_co_open(V9fsPDU *pdu, V9fsFidState *fidp, int flags)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_path_read_lock(s);
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->open(&s->ctx, &fidp->path, flags, &fidp->fs);
+ if (err == -1) {
+ err = -errno;
+ } else {
+ err = 0;
+ }
+ });
+ v9fs_path_unlock(s);
+ if (!err) {
+ total_open_fd++;
+ if (total_open_fd > open_fd_hw) {
+ v9fs_reclaim_fd(pdu);
+ }
+ }
+ return err;
+}
+
+int v9fs_co_open2(V9fsPDU *pdu, V9fsFidState *fidp, V9fsString *name, gid_t gid,
+ int flags, int mode, struct stat *stbuf)
+{
+ int err;
+ FsCred cred;
+ V9fsPath path;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ 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.
+ */
+ v9fs_path_read_lock(s);
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->open2(&s->ctx, &fidp->path,
+ name->data, flags, &cred, &fidp->fs);
+ if (err < 0) {
+ 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);
+ } else {
+ v9fs_path_copy(&fidp->path, &path);
+ }
+ } else {
+ s->ops->close(&s->ctx, &fidp->fs);
+ }
+ v9fs_path_free(&path);
+ }
+ });
+ v9fs_path_unlock(s);
+ if (!err) {
+ total_open_fd++;
+ if (total_open_fd > open_fd_hw) {
+ v9fs_reclaim_fd(pdu);
+ }
+ }
+ return err;
+}
+
+int v9fs_co_close(V9fsPDU *pdu, V9fsFidOpenState *fs)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->close(&s->ctx, fs);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ if (!err) {
+ total_open_fd--;
+ }
+ return err;
+}
+
+int v9fs_co_fsync(V9fsPDU *pdu, V9fsFidState *fidp, int datasync)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->fsync(&s->ctx, fidp->fid_type, &fidp->fs, datasync);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ return err;
+}
+
+int v9fs_co_link(V9fsPDU *pdu, V9fsFidState *oldfid,
+ V9fsFidState *newdirfid, V9fsString *name)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_path_read_lock(s);
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->link(&s->ctx, &oldfid->path,
+ &newdirfid->path, name->data);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ v9fs_path_unlock(s);
+ return err;
+}
+
+int v9fs_co_pwritev(V9fsPDU *pdu, V9fsFidState *fidp,
+ struct iovec *iov, int iovcnt, int64_t offset)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->pwritev(&s->ctx, &fidp->fs, iov, iovcnt, offset);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ return err;
+}
+
+int v9fs_co_preadv(V9fsPDU *pdu, V9fsFidState *fidp,
+ struct iovec *iov, int iovcnt, int64_t offset)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->preadv(&s->ctx, &fidp->fs, iov, iovcnt, offset);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ return err;
+}
Code Review / kvmfornfv.git / blobdiff