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[Qemu-devel] [PATCH 2/3] qemu-nbd: Extend read-only option to nbd device
From: |
Ryota Ozaki |
Subject: |
[Qemu-devel] [PATCH 2/3] qemu-nbd: Extend read-only option to nbd device file |
Date: |
Mon, 29 Mar 2010 02:07:11 +0900 |
This patch allows to operate on nbd device file
without write permission for the file if read-only
option is specified.
Signed-off-by: Ryota Ozaki <address@hidden>
---
qemu-nbd.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 00b8896..7ef409f 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -162,7 +162,7 @@ static int find_partition(BlockDriverState *bs, int
partition,
return -1;
}
-static void show_parts(const char *device)
+static void show_parts(const char *device, bool readonly)
{
if (fork() == 0) {
int nbd;
@@ -172,7 +172,7 @@ static void show_parts(const char *device)
* but remember to load the module with max_part != 0 :
* modprobe nbd max_part=63
*/
- nbd = open(device, O_RDWR);
+ nbd = open(device, readonly ? O_RDONLY : O_RDWR);
if (nbd != -1) {
close(nbd);
}
@@ -322,7 +322,7 @@ int main(int argc, char **argv)
}
if (disconnect) {
- fd = open(argv[optind], O_RDWR);
+ fd = open(argv[optind], readonly ? O_RDONLY : O_RDWR);
if (fd == -1) {
errx(EXIT_FAILURE, "Cannot open %s", argv[optind]);
}
@@ -392,7 +392,7 @@ int main(int argc, char **argv)
}
} while (sock == -1);
- fd = open(device, O_RDWR);
+ fd = open(device, readonly ? O_RDONLY : O_RDWR);
if (fd == -1) {
ret = 1;
goto out;
@@ -415,7 +415,7 @@ int main(int argc, char **argv)
/* update partition table */
- show_parts(device);
+ show_parts(device, readonly);
nbd_client(fd, sock);
close(fd);
--
1.6.5.2