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-rw-r--r--hw/virtio-9p.c96
-rw-r--r--hw/virtio-9p.h9
2 files changed, 86 insertions, 19 deletions
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 78387b8193..f6eb0f3075 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -253,6 +253,11 @@ static int v9fs_do_fsync(V9fsState *s, int fd)
return s->ops->fsync(&s->ctx, fd);
}
+static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf)
+{
+ return s->ops->statfs(&s->ctx, path->data, stbuf);
+}
+
static void v9fs_string_init(V9fsString *str)
{
str->data = NULL;
@@ -1019,11 +1024,10 @@ static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
{
- int32_t msize;
V9fsString version;
size_t offset = 7;
- pdu_unmarshal(pdu, offset, "ds", &msize, &version);
+ pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
if (!strcmp(version.data, "9P2000.u")) {
s->proto_version = V9FS_PROTO_2000U;
@@ -1033,7 +1037,7 @@ static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
v9fs_string_sprintf(&version, "unknown");
}
- offset += pdu_marshal(pdu, offset, "ds", msize, &version);
+ offset += pdu_marshal(pdu, offset, "ds", s->msize, &version);
complete_pdu(s, pdu, offset);
v9fs_string_free(&version);
@@ -1288,6 +1292,26 @@ out:
v9fs_walk_complete(s, vs, err);
}
+static int32_t get_iounit(V9fsState *s, V9fsString *name)
+{
+ struct statfs stbuf;
+ int32_t iounit = 0;
+
+ /*
+ * iounit should be multiples of f_bsize (host filesystem block size
+ * and as well as less than (client msize - P9_IOHDRSZ))
+ */
+ if (!v9fs_do_statfs(s, name, &stbuf)) {
+ iounit = stbuf.f_bsize;
+ iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
+ }
+
+ if (!iounit) {
+ iounit = s->msize - P9_IOHDRSZ;
+ }
+ return iounit;
+}
+
static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err)
{
if (vs->fidp->dir == NULL) {
@@ -1303,6 +1327,15 @@ out:
}
+static void v9fs_open_post_getiounit(V9fsState *s, V9fsOpenState *vs)
+{
+ int err;
+ vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
+ err = vs->offset;
+ complete_pdu(s, vs->pdu, err);
+ qemu_free(vs);
+}
+
static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err)
{
if (vs->fidp->fd == -1) {
@@ -1310,8 +1343,9 @@ static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err)
goto out;
}
- vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
- err = vs->offset;
+ vs->iounit = get_iounit(s, &vs->fidp->path);
+ v9fs_open_post_getiounit(s, vs);
+ return;
out:
complete_pdu(s, vs->pdu, err);
qemu_free(vs);
@@ -1794,15 +1828,28 @@ out:
qemu_free(vs);
}
-static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
+static void v9fs_create_post_getiounit(V9fsState *s, V9fsCreateState *vs)
{
- if (err == 0) {
- v9fs_string_copy(&vs->fidp->path, &vs->fullname);
- stat_to_qid(&vs->stbuf, &vs->qid);
+ int err;
+ v9fs_string_copy(&vs->fidp->path, &vs->fullname);
+ stat_to_qid(&vs->stbuf, &vs->qid);
- vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
+ vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
+ err = vs->offset;
- err = vs->offset;
+ complete_pdu(s, vs->pdu, err);
+ v9fs_string_free(&vs->name);
+ v9fs_string_free(&vs->extension);
+ v9fs_string_free(&vs->fullname);
+ qemu_free(vs);
+}
+
+static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
+{
+ if (err == 0) {
+ vs->iounit = get_iounit(s, &vs->fidp->path);
+ v9fs_create_post_getiounit(s, vs);
+ return;
}
complete_pdu(s, vs->pdu, err);
@@ -2266,23 +2313,34 @@ out:
qemu_free(vs);
}
-static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf)
-{
- return s->ops->statfs(&s->ctx, path->data, stbuf);
-}
-
static void v9fs_statfs_post_statfs(V9fsState *s, V9fsStatfsState *vs, int err)
{
+ int32_t bsize_factor;
+
if (err) {
err = -errno;
goto out;
}
+ /*
+ * compute bsize factor based on host file system block size
+ * and client msize
+ */
+ bsize_factor = (s->msize - P9_IOHDRSZ)/vs->stbuf.f_bsize;
+ if (!bsize_factor) {
+ bsize_factor = 1;
+ }
vs->v9statfs.f_type = vs->stbuf.f_type;
vs->v9statfs.f_bsize = vs->stbuf.f_bsize;
- vs->v9statfs.f_blocks = vs->stbuf.f_blocks;
- vs->v9statfs.f_bfree = vs->stbuf.f_bfree;
- vs->v9statfs.f_bavail = vs->stbuf.f_bavail;
+ vs->v9statfs.f_bsize *= bsize_factor;
+ /*
+ * f_bsize is adjusted(multiplied) by bsize factor, so we need to
+ * adjust(divide) the number of blocks, free blocks and available
+ * blocks by bsize factor
+ */
+ vs->v9statfs.f_blocks = vs->stbuf.f_blocks/bsize_factor;
+ vs->v9statfs.f_bfree = vs->stbuf.f_bfree/bsize_factor;
+ vs->v9statfs.f_bavail = vs->stbuf.f_bavail/bsize_factor;
vs->v9statfs.f_files = vs->stbuf.f_files;
vs->v9statfs.f_ffree = vs->stbuf.f_ffree;
vs->v9statfs.fsid_val = (unsigned int) vs->stbuf.f_fsid.__val[0] |
diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h
index 9773659bb0..4ee38302b7 100644
--- a/hw/virtio-9p.h
+++ b/hw/virtio-9p.h
@@ -70,6 +70,12 @@ enum p9_proto_version {
#define P9_NOFID (u32)(~0)
#define P9_MAXWELEM 16
+/*
+ * ample room for Twrite/Rread header
+ * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
+ */
+#define P9_IOHDRSZ 24
+
typedef struct V9fsPDU V9fsPDU;
struct V9fsPDU
@@ -154,6 +160,7 @@ typedef struct V9fsState
uint8_t *tag;
size_t config_size;
enum p9_proto_version proto_version;
+ int32_t msize;
} V9fsState;
typedef struct V9fsCreateState {
@@ -167,6 +174,7 @@ typedef struct V9fsCreateState {
V9fsString name;
V9fsString extension;
V9fsString fullname;
+ int iounit;
} V9fsCreateState;
typedef struct V9fsStatState {
@@ -197,6 +205,7 @@ typedef struct V9fsOpenState {
V9fsFidState *fidp;
V9fsQID qid;
struct stat stbuf;
+ int iounit;
} V9fsOpenState;
typedef struct V9fsReadState {
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-30 14:29:19 +0000