Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 275 insertions, 0 deletions

diff --git a/qemu/hw/9pfs/cofile.c b/qemu/hw/9pfs/cofile.c
new file mode 100644
index 000000000..2efebf357
--- /dev/null
+++ b/qemu/hw/9pfs/cofile.c
@@ -0,0 +1,275 @@
+
+/*
+ * 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;
+}