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hw/9pfs: Read-only support for 9p export

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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>
This commit is contained in:
M. Mohan Kumar 2011-10-25 12:10:39 +05:30 • committed by Aneesh Kumar K.V
parent f02b77c9bf
commit 2c74c2cb4b
6 changed files with 78 additions and 6 deletions
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50
hw/9pfs/virtio-9p.c
View file

@ -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);
}