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[Qemu-devel] [PATCH -V4 08/21] virtio-9p: Add sg helper functions
From: |
Aneesh Kumar K.V |
Subject: |
[Qemu-devel] [PATCH -V4 08/21] virtio-9p: Add sg helper functions |
Date: |
Fri, 9 Apr 2010 17:13:11 +0530 |
From: Anthony Liguori <address@hidden>
Add scatter-gather helper functions.
Signed-off-by: Anthony Liguori <address@hidden>
Signed-off-by: Aneesh Kumar K.V <address@hidden>
---
hw/virtio-9p.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 4b3ce2f..5dab1d3 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -764,6 +764,56 @@ static int stat_to_v9stat(V9fsState *s, V9fsString *name,
return 0;
}
+static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
+{
+ while (len && *iovcnt) {
+ if (len < sg->iov_len) {
+ sg->iov_len -= len;
+ sg->iov_base += len;
+ len = 0;
+ } else {
+ len -= sg->iov_len;
+ sg++;
+ *iovcnt -= 1;
+ }
+ }
+
+ return sg;
+}
+
+static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
+{
+ int i;
+ int total = 0;
+
+ for (i = 0; i < *cnt; i++) {
+ if ((total + sg[i].iov_len) > cap) {
+ sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
+ i++;
+ break;
+ }
+ total += sg[i].iov_len;
+ }
+
+ *cnt = i;
+
+ return sg;
+}
+
+static void print_sg(struct iovec *sg, int cnt)
+{
+ int i;
+
+ printf("sg[%d]: {", cnt);
+ for (i = 0; i < cnt; i++) {
+ if (i) {
+ printf(", ");
+ }
+ printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
+ }
+ printf("}\n");
+}
+
static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
{
/* Note: The following have been added to prevent GCC from complaining
@@ -788,6 +838,9 @@ static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
(void) donttouch_stat;
(void) v9fs_stat_free;
(void) stat_to_v9stat;
+ (void) adjust_sg;
+ (void) cap_sg;
+ (void) print_sg;
}
static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
--
1.7.0.4.360.g11766c
- [Qemu-devel] [PATCH -V4 00/21] virtio-9p: paravirtual file system passthrough, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 05/21] virtio-9p: Add minimal set of FileOperations, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 01/21] virtio-9p: Create a commandline option -fsdev, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 03/21] virtio-9p: pdu processing support., Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 02/21] virtio-9p: Add a virtio 9p device to qemu, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 04/21] virtio-9p: Add string manipulation support., Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 10/21] virtio-9p: Add P9_TATTACH support., Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 07/21] virtio-9p: Add stat and mode related helper functions., Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 06/21] virtio-9p: Add fid and qid management support., Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 11/21] virtio-9p: Add P9_TSTAT support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 08/21] virtio-9p: Add sg helper functions,
Aneesh Kumar K.V <=
- [Qemu-devel] [PATCH -V4 09/21] virtio-9p: Add P9_TVERSION support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 14/21] virtio-9p: Add P9_TREAD support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 12/21] virtio-9p: Add P9_TWALK support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 15/21] virtio-9p: Add P9_TCLUNK support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 17/21] virtio-9p: Add P9_TCREATE support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 16/21] virtio-9p: Add P9_TWRITE support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 19/21] virtio-9p: Add P9_TREMOVE support., Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 20/21] virtio-9p: Add P9_TFLUSH support, Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 13/21] virtio-9p: Add P9_TOPEN support., Aneesh Kumar K.V, 2010/04/09
- [Qemu-devel] [PATCH -V4 21/21] virtio-9p: Create a syntactic shortcut for the file-system pass-thru, Aneesh Kumar K.V, 2010/04/09