9pfs: enable 9pfs on Windows and Macos for 2.8

I modify the maru defined codes of 9pfs for applying qemu 2.8 upgrade.

Change-Id: I6746a73de8f66b6ca1940c09a001d6ee6c21562a
Signed-off-by: Sooyoung Ha <yoosah.ha@samsung.com>

3 files changed, 191 insertions, 130 deletions

diff --git a/configure b/configure
index 0357b1f5bd..ef57ee9b3e 100755
--- a/configure
+++ b/configure
@@ -1916,7 +1916,6 @@ fi
 # avx2 optimization requirement check
 
 cat > $TMPC << EOF
-#ifndef __clang__
 #pragma GCC push_options
 #pragma GCC target("avx2")
 #include <cpuid.h>
@@ -1926,7 +1925,6 @@ static int bar(void *a) {
     return _mm256_testz_si256(x, x);
 }
 int main(int argc, char *argv[]) { return bar(argv[0]); }
-#endif //__clang__
 EOF
 if compile_object "" ; then
   avx2_opt="yes"
diff --git a/hw/9pfs/9p-local-maru.c b/hw/9pfs/9p-local-maru.c
index 7605f1dd13..cac8784dda 100644
--- a/hw/9pfs/9p-local-maru.c
+++ b/hw/9pfs/9p-local-maru.c
@@ -587,6 +587,7 @@ again:
         }
         entry->d_type = DT_UNKNOWN;
     }
+
 #else
     if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
         if (!strcmp(entry->d_name, VIRTFS_META_DIR)) {
@@ -1558,20 +1559,16 @@ static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
     LOG_TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     if (dir_path) {
 #ifndef CONFIG_WIN32
-        v9fs_string_sprintf((V9fsString *)target, "%s/%s",
-                            dir_path->data, name);
+        v9fs_path_sprintf(target, "%s/%s", dir_path->data, name);
 #else
-        v9fs_string_sprintf((V9fsString *)target, "%s\\%s",
-                            dir_path->data, name);
+        v9fs_path_sprintf(target, "%s\\%s", dir_path->data, name);
     while((target->data)[strlen(target->data)-1] == '\\'){
         (target->data)[strlen(target->data)-1] = '\0';
     }
 #endif
     } else {
-        v9fs_string_sprintf((V9fsString *)target, "%s", name);
+        v9fs_path_sprintf(target, "%s", name);
     }
-    /* Bump the size for including terminating NULL */
-    target->size++;
     return 0;
 }
 
diff --git a/hw/9pfs/9p-maru.c b/hw/9pfs/9p-maru.c
index ebe4987d73..20d0d07a46 100644
--- a/hw/9pfs/9p-maru.c
+++ b/hw/9pfs/9p-maru.c
@@ -29,6 +29,7 @@
  */
 
 #include "qemu/osdep.h"
+#include <glib/gprintf.h>
 #include "hw/virtio/virtio.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
@@ -58,6 +59,9 @@ extern uint64_t hostBytesPerSector;
 #ifdef CONFIG_DARWIN
 #define O_DIRECT 040000 /* Direct disk access */
 #define O_NOATIME 01000000 /* Do not set atime */
+#ifndef XATTR_SIZE_MAX
+#define XATTR_SIZE_MAX 65536
+#endif
 #endif
 
 #include "../../tizen/src/debug_ch.h"
@@ -218,6 +222,20 @@ void v9fs_path_free(V9fsPath *path)
     path->size = 0;
 }
 
+
+void GCC_FMT_ATTR(2, 3)
+v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...)
+{
+    va_list ap;
+
+    v9fs_path_free(path);
+
+    va_start(ap, fmt);
+    /* Bump the size for including terminating NULL */
+    path->size = g_vasprintf(&path->data, fmt, ap) + 1;
+    va_end(ap);
+}
+
 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs)
 {
     v9fs_path_free(lhs);
@@ -265,7 +283,7 @@ static size_t v9fs_string_size(V9fsString *str)
 
 /*
  * returns 0 if fid got re-opened, 1 if not, < 0 on error */
-static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
+static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int err = 1;
@@ -285,7 +303,7 @@ static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
     return err;
 }
 
-static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid)
+static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int err;
@@ -355,12 +373,12 @@ static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
 }
 
 #ifndef CONFIG_WIN32
-static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
+static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int retval = 0;
 
-    if (fidp->fs.xattr.copied_len == -1) {
+    if (fidp->fs.xattr.xattrwalk_fid) {
         /* getxattr/listxattr fid */
         goto free_value;
     }
@@ -389,7 +407,7 @@ free_value:
 }
 #endif
 
-static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
+static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int retval = 0;
@@ -415,7 +433,7 @@ static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
     return retval;
 }
 
-static int put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
+static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
 {
     BUG_ON(!fidp->ref);
     fidp->ref--;
@@ -459,7 +477,7 @@ static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid)
     return fidp;
 }
 
-void v9fs_reclaim_fd(V9fsPDU *pdu)
+void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu)
 {
     int reclaim_count = 0;
     V9fsState *s = pdu->s;
@@ -540,7 +558,7 @@ void v9fs_reclaim_fd(V9fsPDU *pdu)
     }
 }
 
-static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
+static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
 {
     TRACE("[%d][ >> %s]\n", __LINE__, __func__);
     int err;
@@ -574,11 +592,11 @@ static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
     return 0;
 }
 
-static void virtfs_reset(V9fsPDU *pdu)
+static void coroutine_fn virtfs_reset(V9fsPDU *pdu)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     V9fsState *s = pdu->s;
-    V9fsFidState *fidp = NULL;
+    V9fsFidState *fidp;
 
     /* Free all fids */
     while (s->fid_list) {
@@ -591,11 +609,6 @@ static void virtfs_reset(V9fsPDU *pdu)
             free_fid(pdu, fidp);
         }
     }
-    if (fidp) {
-        /* One or more unclunked fids found... */
-        error_report("9pfs:%s: One or more uncluncked fids "
-                     "found during reset", __func__);
-    }
 }
 
 #define P9_QID_TYPE_DIR         0x80
@@ -645,7 +658,8 @@ static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
     }
 }
 
-static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp)
+static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp,
+                                   V9fsQID *qidp)
 {
     TRACE("[%d][ >> %s]\n", __LINE__, __func__);
     struct stat stbuf;
@@ -673,17 +687,11 @@ V9fsPDU *pdu_alloc(V9fsState *s)
 
 void pdu_free(V9fsPDU *pdu)
 {
-    if (pdu) {
-        V9fsState *s = pdu->s;
-        /*
-         * Cancelled pdu are added back to the freelist
-         * by flush request .
-         */
-        if (!pdu->cancelled) {
-            QLIST_REMOVE(pdu, next);
-            QLIST_INSERT_HEAD(&s->free_list, pdu, next);
-        }
-    }
+    V9fsState *s = pdu->s;
+
+    g_assert(!pdu->cancelled);
+    QLIST_REMOVE(pdu, next);
+    QLIST_INSERT_HEAD(&s->free_list, pdu, next);
 }
 
 /*
@@ -691,7 +699,7 @@ void pdu_free(V9fsPDU *pdu)
  * because we always expect to have enough space to encode
  * error details
  */
-static void pdu_complete(V9fsPDU *pdu, ssize_t len)
+static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len)
 {
     int8_t id = pdu->id + 1; /* Response */
     V9fsState *s = pdu->s;
@@ -729,9 +737,9 @@ static void pdu_complete(V9fsPDU *pdu, ssize_t len)
     pdu_push_and_notify(pdu);
 
     /* Now wakeup anybody waiting in flush for this request */
-    qemu_co_queue_next(&pdu->complete);
-
-    pdu_free(pdu);
+    if (!qemu_co_queue_next(&pdu->complete)) {
+        pdu_free(pdu);
+    }
 }
 
 #ifndef CONFIG_WIN32
@@ -863,9 +871,9 @@ static uint32_t stat_to_v9mode(const struct stat *stbuf)
     return mode;
 }
 
-static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
-                            const struct stat *stbuf,
-                            V9fsStat *v9stat)
+static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
+                                       const struct stat *stbuf,
+                                       V9fsStat *v9stat)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int err;
@@ -879,15 +887,15 @@ static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
     v9stat->mtime = stbuf->st_mtime;
     v9stat->length = stbuf->st_size;
 
-    v9fs_string_null(&v9stat->uid);
-    v9fs_string_null(&v9stat->gid);
-    v9fs_string_null(&v9stat->muid);
+    v9fs_string_free(&v9stat->uid);
+    v9fs_string_free(&v9stat->gid);
+    v9fs_string_free(&v9stat->muid);
 
     v9stat->n_uid = stbuf->st_uid;
     v9stat->n_gid = stbuf->st_gid;
     v9stat->n_muid = 0;
 
-    v9fs_string_null(&v9stat->extension);
+    v9fs_string_free(&v9stat->extension);
 
     if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
         err = v9fs_co_readlink(pdu, name, &v9stat->extension);
@@ -1011,10 +1019,8 @@ static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
     V9fsPath str;
     v9fs_path_init(&str);
     v9fs_path_copy(&str, dst);
-    v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len);
+    v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len);
     v9fs_path_free(&str);
-    /* +1 to include terminating NULL */
-    dst->size++;
 }
 
 static inline bool is_ro_export(FsContext *ctx)
@@ -1022,7 +1028,7 @@ static inline bool is_ro_export(FsContext *ctx)
     return ctx->export_flags & V9FS_RDONLY;
 }
 
-static void v9fs_version(void *opaque)
+static void coroutine_fn v9fs_version(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     ssize_t err;
@@ -1061,7 +1067,7 @@ out:
     v9fs_string_free(&version);
 }
 
-static void v9fs_attach(void *opaque)
+static void coroutine_fn v9fs_attach(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     V9fsPDU *pdu = opaque;
@@ -1132,7 +1138,7 @@ out_nofid:
     v9fs_string_free(&aname);
 }
 
-static void v9fs_stat(void *opaque)
+static void coroutine_fn v9fs_stat(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -1177,7 +1183,7 @@ out_nofid:
     pdu_complete(pdu, err);
 }
 
-static void v9fs_getattr(void *opaque)
+static void coroutine_fn v9fs_getattr(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -1254,7 +1260,7 @@ out_nofid:
 
 #define P9_ATTR_MASK    127
 
-static void v9fs_setattr(void *opaque)
+static void coroutine_fn v9fs_setattr(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int err = 0;
@@ -1387,7 +1393,7 @@ static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2)
         qid1->path != qid2->path;
 }
 
-static void v9fs_walk(void *opaque)
+static void coroutine_fn v9fs_walk(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int name_idx;
@@ -1442,13 +1448,14 @@ static void v9fs_walk(void *opaque)
         goto out_nofid;
     }
 
+    v9fs_path_init(&dpath);
+    v9fs_path_init(&path);
+
     err = fid_to_qid(pdu, fidp, &qid);
     if (err < 0) {
         goto out;
     }
 
-    v9fs_path_init(&dpath);
-    v9fs_path_init(&path);
     /*
      * Both dpath and path initially poin to fidp.
      * Needed to handle request with nwnames == 0
@@ -1475,7 +1482,10 @@ static void v9fs_walk(void *opaque)
         memcpy(&qids[name_idx], &qid, sizeof(qid));
     }
     if (fid == newfid) {
-        BUG_ON(fidp->fid_type != P9_FID_NONE);
+        if (fidp->fid_type != P9_FID_NONE) {
+            err = -EINVAL;
+            goto out;
+        }
         WARN("[%d][ >> %s]\n", __LINE__, __func__);
         v9fs_path_copy(&fidp->path, &path);
     } else {
@@ -1508,7 +1518,7 @@ out_nofid:
     }
 }
 
-static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
+static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path)
 {
     struct statfs stbuf;
     int32_t iounit = 0;
@@ -1528,7 +1538,7 @@ static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
     return iounit;
 }
 
-static void v9fs_open(void *opaque)
+static void coroutine_fn v9fs_open(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int flags;
@@ -1562,7 +1572,11 @@ static void v9fs_open(void *opaque)
         err = -ENOENT;
         goto out_nofid;
     }
-    BUG_ON(fidp->fid_type != P9_FID_NONE);
+    if (fidp->fid_type != P9_FID_NONE) {
+        ERR("[%d][ >> %s]\n", __LINE__, __func__);
+        err = -EINVAL;
+        goto out;
+    }
 
     err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
     if (err < 0) {
@@ -1627,7 +1641,7 @@ out_nofid:
     pdu_complete(pdu, err);
 }
 
-static void v9fs_lcreate(void *opaque)
+static void coroutine_fn v9fs_lcreate(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t dfid, flags, mode;
@@ -1732,7 +1746,7 @@ out_nofid:
     pdu_complete(pdu, err);
 }
 
-static void v9fs_clunk(void *opaque)
+static void coroutine_fn v9fs_clunk(void *opaque)
 {
     int err;
     int32_t fid;
@@ -1771,20 +1785,17 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
 {
     ssize_t err;
     size_t offset = 7;
-    int read_count;
-    int64_t xattr_len;
+    uint64_t read_count;
     V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
     VirtQueueElement *elem = v->elems[pdu->idx];
 
-    xattr_len = fidp->fs.xattr.len;
-    read_count = xattr_len - off;
+    if (fidp->fs.xattr.len < off) {
+        read_count = 0;
+    } else {
+        read_count = fidp->fs.xattr.len - off;
+    }
     if (read_count > max_count) {
         read_count = max_count;
-    } else if (read_count < 0) {
-        /*
-         * read beyond XATTR value
-         */
-        read_count = 0;
     }
     err = pdu_marshal(pdu, offset, "d", read_count);
     if (err < 0) {
@@ -1803,8 +1814,9 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
 }
 #endif
 
-static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
-                                     V9fsFidState *fidp, uint32_t max_count)
+static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu,
+                                                  V9fsFidState *fidp,
+                                                  uint32_t max_count)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     V9fsPath path;
@@ -1903,7 +1915,7 @@ static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
     qemu_iovec_concat(qiov, &elem, skip, size);
 }
 
-static void v9fs_read(void *opaque)
+static void coroutine_fn v9fs_read(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -1973,15 +1985,16 @@ static void v9fs_read(void *opaque)
                 /* IO error return the error */
                 ERR("[%d][ >> %s]\n", __LINE__, __func__);
                 err = len;
-                goto out;
+                goto out_free_iovec;
             }
         } while (count < max_count && len > 0);
         err = pdu_marshal(pdu, offset, "d", count);
         if (err < 0) {
             ERR("[%d][ >> %s]\n", __LINE__, __func__);
-            goto out;
+            goto out_free_iovec;
         }
         err += offset + count;
+out_free_iovec:
         qemu_iovec_destroy(&qiov);
         qemu_iovec_destroy(&qiov_full);
 #ifndef CONFIG_WIN32
@@ -2008,8 +2021,8 @@ static size_t v9fs_readdir_data_size(V9fsString *name)
     return 24 + v9fs_string_size(name);
 }
 
-static int v9fs_do_readdir(V9fsPDU *pdu,
-                           V9fsFidState *fidp, int32_t max_count)
+static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
+                                        int32_t max_count)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     size_t size;
@@ -2034,7 +2047,6 @@ static int v9fs_do_readdir(V9fsPDU *pdu,
 
         err = v9fs_co_readdir(pdu, fidp, &dent);
         if (err || !dent) {
-            ERR("[%d][ >> %s]\n", __LINE__, __func__);
             break;
         }
         v9fs_string_init(&name);
@@ -2100,7 +2112,7 @@ static int v9fs_do_readdir(V9fsPDU *pdu,
     return count;
 }
 
-static void v9fs_readdir(void *opaque)
+static void coroutine_fn v9fs_readdir(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -2162,23 +2174,18 @@ static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
 {
     int i, to_copy;
     ssize_t err = 0;
-    int write_count;
-    int64_t xattr_len;
+    uint64_t write_count;
     size_t offset = 7;
 
 
-    xattr_len = fidp->fs.xattr.len;
-    write_count = xattr_len - off;
-    if (write_count > count) {
-        write_count = count;
-    } else if (write_count < 0) {
-        /*
-         * write beyond XATTR value len specified in
-         * xattrcreate
-         */
+    if (fidp->fs.xattr.len < off) {
         err = -ENOSPC;
         goto out;
     }
+    write_count = fidp->fs.xattr.len - off;
+    if (write_count > count) {
+        write_count = count;
+    }
     err = pdu_marshal(pdu, offset, "d", write_count);
     if (err < 0) {
         return err;
@@ -2204,7 +2211,7 @@ out:
 }
 #endif
 
-static void v9fs_write(void *opaque)
+static void coroutine_fn v9fs_write(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     ssize_t err;
@@ -2285,7 +2292,7 @@ static void v9fs_write(void *opaque)
     err = pdu_marshal(pdu, offset, "d", total);
     if (err < 0) {
         ERR("[%d][ >> %s]\n", __LINE__, __func__);
-        goto out;
+        goto out_qiov;
     }
     err += offset;
     trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
@@ -2298,7 +2305,7 @@ out_nofid:
     pdu_complete(pdu, err);
 }
 
-static void v9fs_create(void *opaque)
+static void coroutine_fn v9fs_create(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -2501,7 +2508,7 @@ out_nofid:
    v9fs_path_free(&path);
 }
 
-static void v9fs_symlink(void *opaque)
+static void coroutine_fn v9fs_symlink(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     V9fsPDU *pdu = opaque;
@@ -2596,7 +2603,7 @@ static void v9fs_flush(void *opaque)
     pdu_complete(pdu, 7);
 }
 
-static void v9fs_link(void *opaque)
+static void coroutine_fn v9fs_link(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     V9fsPDU *pdu = opaque;
@@ -2638,6 +2645,7 @@ static void v9fs_link(void *opaque)
     if (!err) {
         err = offset;
     }
+    put_fid(pdu, oldfidp);
 out:
     put_fid(pdu, dfidp);
 out_nofid:
@@ -2646,7 +2654,7 @@ out_nofid:
 }
 
 /* Only works with path name based fid */
-static void v9fs_remove(void *opaque)
+static void coroutine_fn v9fs_remove(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -2691,7 +2699,7 @@ out_nofid:
     pdu_complete(pdu, err);
 }
 
-static void v9fs_unlinkat(void *opaque)
+static void coroutine_fn v9fs_unlinkat(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int err = 0;
@@ -2753,9 +2761,11 @@ out_nofid:
     v9fs_string_free(&name);
 }
 
+
 /* Only works with path name based fid */
-static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
-                                int32_t newdirfid, V9fsString *name)
+static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
+                                             int32_t newdirfid,
+                                             V9fsString *name)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     char *end;
@@ -2773,7 +2783,10 @@ static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
             err = -ENOENT;
             goto out_nofid;
         }
-        BUG_ON(dirfidp->fid_type != P9_FID_NONE);
+        if (fidp->fid_type != P9_FID_NONE) {
+            err = -EINVAL;
+            goto out;
+        }
         v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
     } else {
         old_name = fidp->path.data;
@@ -2813,7 +2826,7 @@ out_nofid:
 }
 
 /* Only works with path name based fid */
-static void v9fs_rename(void *opaque)
+static void coroutine_fn v9fs_rename(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -2846,7 +2859,10 @@ static void v9fs_rename(void *opaque)
         err = -ENOENT;
         goto out_nofid;
     }
-    BUG_ON(fidp->fid_type != P9_FID_NONE);
+    if (fidp->fid_type != P9_FID_NONE) {
+        err = -EINVAL;
+        goto out;
+    }
     /* if fs driver is not path based, return EOPNOTSUPP */
     if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
         err = -EOPNOTSUPP;
@@ -2865,9 +2881,10 @@ out_nofid:
     v9fs_string_free(&name);
 }
 
-static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
-                               V9fsString *old_name, V9fsPath *newdir,
-                               V9fsString *new_name)
+static void coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
+                                            V9fsString *old_name,
+                                            V9fsPath *newdir,
+                                            V9fsString *new_name)
 {
     V9fsFidState *tfidp;
     V9fsPath oldpath, newpath;
@@ -2893,9 +2910,10 @@ static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
     v9fs_path_free(&newpath);
 }
 
-static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
-                                  V9fsString *old_name, int32_t newdirfid,
-                                  V9fsString *new_name)
+static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
+                                               V9fsString *old_name,
+                                               int32_t newdirfid,
+                                               V9fsString *new_name)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int err = 0;
@@ -2937,7 +2955,7 @@ out:
     return err;
 }
 
-static void v9fs_renameat(void *opaque)
+static void coroutine_fn v9fs_renameat(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     ssize_t err = 0;
@@ -2980,7 +2998,7 @@ out_err:
     v9fs_string_free(&new_name);
 }
 
-static void v9fs_wstat(void *opaque)
+static void coroutine_fn v9fs_wstat(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -3134,7 +3152,7 @@ static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf)
                        fsid_val, f_namelen);
 }
 
-static void v9fs_statfs(void *opaque)
+static void coroutine_fn v9fs_statfs(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int32_t fid;
@@ -3169,7 +3187,7 @@ out_nofid:
     pdu_complete(pdu, retval);
 }
 
-static void v9fs_mknod(void *opaque)
+static void coroutine_fn v9fs_mknod(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
 
@@ -3240,7 +3258,7 @@ out_nofid:
  * do any thing in * qemu 9p server side lock code path.
  * So when a TLOCK request comes, always return success
  */
-static void v9fs_lock(void *opaque)
+static void coroutine_fn v9fs_lock(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     int8_t status;
@@ -3294,7 +3312,7 @@ out_nofid:
  * When a TGETLOCK request comes, always return success because all lock
  * handling is done by client's VFS layer.
  */
-static void v9fs_getlock(void *opaque)
+static void coroutine_fn v9fs_getlock(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     size_t offset = 7;
@@ -3340,7 +3358,7 @@ out_nofid:
     v9fs_string_free(&glock.client_id);
 }
 
-static void v9fs_mkdir(void *opaque)
+static void coroutine_fn v9fs_mkdir(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     V9fsPDU *pdu = opaque;
@@ -3396,7 +3414,7 @@ out_nofid:
 }
 
 #ifndef CONFIG_WIN32
-static void v9fs_xattrwalk(void *opaque)
+static void coroutine_fn v9fs_xattrwalk(void *opaque)
 {
     int64_t size;
     V9fsString name;
@@ -3426,7 +3444,7 @@ static void v9fs_xattrwalk(void *opaque)
         goto out;
     }
     v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
-    if (name.data == NULL) {
+    if (!v9fs_string_size(&name)) {
         /*
          * listxattr request. Get the size first
          */
@@ -3441,7 +3459,7 @@ static void v9fs_xattrwalk(void *opaque)
          */
         xattr_fidp->fs.xattr.len = size;
         xattr_fidp->fid_type = P9_FID_XATTR;
-        xattr_fidp->fs.xattr.copied_len = -1;
+        xattr_fidp->fs.xattr.xattrwalk_fid = true;
         if (size) {
             xattr_fidp->fs.xattr.value = g_malloc(size);
             err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
@@ -3474,7 +3492,7 @@ static void v9fs_xattrwalk(void *opaque)
          */
         xattr_fidp->fs.xattr.len = size;
         xattr_fidp->fid_type = P9_FID_XATTR;
-        xattr_fidp->fs.xattr.copied_len = -1;
+        xattr_fidp->fs.xattr.xattrwalk_fid = true;
         if (size) {
             xattr_fidp->fs.xattr.value = g_malloc(size);
             err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
@@ -3502,11 +3520,11 @@ out_nofid:
     v9fs_string_free(&name);
 }
 
-static void v9fs_xattrcreate(void *opaque)
+static void coroutine_fn v9fs_xattrcreate(void *opaque)
 {
     int flags;
     int32_t fid;
-    int64_t size;
+    uint64_t size;
     ssize_t err = 0;
     V9fsString name;
     size_t offset = 7;
@@ -3521,21 +3539,33 @@ static void v9fs_xattrcreate(void *opaque)
     }
     trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
 
+    if (size > XATTR_SIZE_MAX) {
+        err = -E2BIG;
+        goto out_nofid;
+    }
+
     file_fidp = get_fid(pdu, fid);
     if (file_fidp == NULL) {
         err = -EINVAL;
         goto out_nofid;
     }
+    if (file_fidp->fid_type != P9_FID_NONE) {
+        err = -EINVAL;
+        goto out_put_fid;
+    }
+
     /* Make the file fid point to xattr */
     xattr_fidp = file_fidp;
     xattr_fidp->fid_type = P9_FID_XATTR;
     xattr_fidp->fs.xattr.copied_len = 0;
+    xattr_fidp->fs.xattr.xattrwalk_fid = false;
     xattr_fidp->fs.xattr.len = size;
     xattr_fidp->fs.xattr.flags = flags;
     v9fs_string_init(&xattr_fidp->fs.xattr.name);
     v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
-    xattr_fidp->fs.xattr.value = g_malloc(size);
+    xattr_fidp->fs.xattr.value = g_malloc0(size);
     err = offset;
+out_put_fid:
     put_fid(pdu, file_fidp);
 out_nofid:
     pdu_complete(pdu, err);
@@ -3543,7 +3573,7 @@ out_nofid:
 }
 #endif
 
-static void v9fs_readlink(void *opaque)
+static void coroutine_fn v9fs_readlink(void *opaque)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
     V9fsPDU *pdu = opaque;
@@ -3622,14 +3652,14 @@ static CoroutineEntry *pdu_co_handlers[] = {
     [P9_TREMOVE] = v9fs_remove,
 };
 
-static void v9fs_op_not_supp(void *opaque)
+static void coroutine_fn v9fs_op_not_supp(void *opaque)
 {
     WARN("[%d][%s] >> This operation is not supported.\n", __LINE__, __func__);
     V9fsPDU *pdu = opaque;
     pdu_complete(pdu, -EOPNOTSUPP);
 }
 
-static void v9fs_fs_ro(void *opaque)
+static void coroutine_fn v9fs_fs_ro(void *opaque)
 {
     WARN("[%d][%s] >> This is the read-only operation.\n", __LINE__, __func__);
     V9fsPDU *pdu = opaque;
@@ -3772,8 +3802,11 @@ int v9fs_device_realize_common(V9fsState *s, Error **errp)
     rc = 0;
 out:
     if (rc) {
-        g_free(s->ctx.fs_root);
+        if (s->ops->cleanup && s->ctx.private) {
+            s->ops->cleanup(&s->ctx);
+        }
         g_free(s->tag);
+        g_free(s->ctx.fs_root);
         v9fs_path_free(&path);
     }
     return rc;
@@ -3782,8 +3815,41 @@ out:
 void v9fs_device_unrealize_common(V9fsState *s, Error **errp)
 {
     TRACE("[%d][ Enter >> %s]\n", __LINE__, __func__);
-    g_free(s->ctx.fs_root);
+    if (s->ops->cleanup) {
+        s->ops->cleanup(&s->ctx);
+    }
     g_free(s->tag);
+    g_free(s->ctx.fs_root);
+}
+
+typedef struct VirtfsCoResetData {
+    V9fsPDU pdu;
+    bool done;
+} VirtfsCoResetData;
+
+static void coroutine_fn virtfs_co_reset(void *opaque)
+{
+    VirtfsCoResetData *data = opaque;
+
+    virtfs_reset(&data->pdu);
+    data->done = true;
+}
+
+void v9fs_reset(V9fsState *s)
+{
+    VirtfsCoResetData data = { .pdu = { .s = s }, .done = false };
+    Coroutine *co;
+
+    while (!QLIST_EMPTY(&s->active_list)) {
+        aio_poll(qemu_get_aio_context(), true);
+    }
+
+    co = qemu_coroutine_create(virtfs_co_reset, &data);
+    qemu_coroutine_enter(co);
+
+    while (!data.done) {
+        aio_poll(qemu_get_aio_context(), true);
+    }
 }
 
 static void __attribute__((__constructor__)) v9fs_set_fd_limit(void)