diff options
author | M. Mohan Kumar <mohan@in.ibm.com> | 2011-10-25 12:10:39 +0530 |
---|---|---|
committer | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2011-10-31 12:34:17 +0530 |
commit | 2c74c2cb4bedddbfa67628fbd5f9273b4e0e9903 (patch) | |
tree | 308232ce3bd97b8e9641c88b396ed3e9c5009d90 /hw/9pfs/virtio-9p.c | |
parent | f02b77c9bfc5c3ac93a89026f8c1d320f61f02c9 (diff) | |
download | qemu-2c74c2cb4bedddbfa67628fbd5f9273b4e0e9903.zip qemu-2c74c2cb4bedddbfa67628fbd5f9273b4e0e9903.tar.gz qemu-2c74c2cb4bedddbfa67628fbd5f9273b4e0e9903.tar.bz2 |
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.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c index 8b6813f..e7618d7 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); } |