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authorM. Mohan Kumar <mohan@in.ibm.com>2011-10-25 12:10:39 +0530
committerAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-10-31 12:34:17 +0530
commit2c74c2cb4bedddbfa67628fbd5f9273b4e0e9903 (patch)
tree308232ce3bd97b8e9641c88b396ed3e9c5009d90 /hw/9pfs/virtio-9p.c
parentf02b77c9bfc5c3ac93a89026f8c1d320f61f02c9 (diff)
hw/9pfs: Read-only support for 9p export
A new fsdev parameter "readonly" is introduced to control accessing 9p export. "readonly" can be used to specify the access type. By default "rw" access is given to 9p export. Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'hw/9pfs/virtio-9p.c')
-rw-r--r--hw/9pfs/virtio-9p.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index 8b6813f8de..e7618d72ba 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -1271,6 +1271,11 @@ static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
dst->size++;
}
+static inline bool is_ro_export(FsContext *ctx)
+{
+ return ctx->export_flags & V9FS_RDONLY;
+}
+
static void v9fs_version(void *opaque)
{
V9fsPDU *pdu = opaque;
@@ -1690,6 +1695,14 @@ static void v9fs_open(void *opaque)
} else {
flags = omode_to_uflags(mode);
}
+ if (is_ro_export(&s->ctx)) {
+ if (mode & O_WRONLY || mode & O_RDWR ||
+ mode & O_APPEND || mode & O_TRUNC) {
+ err = -EROFS;
+ goto out;
+ }
+ flags |= O_NOATIME;
+ }
err = v9fs_co_open(pdu, fidp, flags);
if (err < 0) {
goto out;
@@ -3309,6 +3322,39 @@ static void v9fs_op_not_supp(void *opaque)
complete_pdu(pdu->s, pdu, -EOPNOTSUPP);
}
+static void v9fs_fs_ro(void *opaque)
+{
+ V9fsPDU *pdu = opaque;
+ complete_pdu(pdu->s, pdu, -EROFS);
+}
+
+static inline bool is_read_only_op(V9fsPDU *pdu)
+{
+ switch (pdu->id) {
+ case P9_TREADDIR:
+ case P9_TSTATFS:
+ case P9_TGETATTR:
+ case P9_TXATTRWALK:
+ case P9_TLOCK:
+ case P9_TGETLOCK:
+ case P9_TREADLINK:
+ case P9_TVERSION:
+ case P9_TLOPEN:
+ case P9_TATTACH:
+ case P9_TSTAT:
+ case P9_TWALK:
+ case P9_TCLUNK:
+ case P9_TFSYNC:
+ case P9_TOPEN:
+ case P9_TREAD:
+ case P9_TAUTH:
+ case P9_TFLUSH:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
{
Coroutine *co;
@@ -3320,6 +3366,10 @@ static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
} else {
handler = pdu_co_handlers[pdu->id];
}
+
+ if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) {
+ handler = v9fs_fs_ro;
+ }
co = qemu_coroutine_create(handler);
qemu_coroutine_enter(co, pdu);
}