[03/12] nbd: support NBD_SET_FLAGS ioctl

Submitted by Paolo Bonzini on Sept. 8, 2011, 3:24 p.m.

Details

Message ID 1315495505-28906-4-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini Sept. 8, 2011, 3:24 p.m.
The nbd kernel module cannot enable DISCARD requests unless it is
informed about it.  The flags field in the header is used for this,
and this patch adds support for it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 nbd.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

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diff --git a/nbd.c b/nbd.c
index 9ed2239..30cd78f 100644
--- a/nbd.c
+++ b/nbd.c
@@ -377,6 +377,14 @@  int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize)
         }
     }
 
+    if (ioctl(fd, NBD_SET_FLAGS, flags) < 0
+        && errno != ENOTTY) {
+        int serrno = errno;
+        LOG("Failed setting flags");
+        errno = serrno;
+        return -1;
+    }
+
     TRACE("Clearing NBD socket");
 
     if (ioctl(fd, NBD_CLEAR_SOCK) == -1) {