[libvirt] [PATCH RFC 36/48] fdstream: Track formatted message
Michal Privoznik
mprivozn at redhat.com
Wed Jun 22 14:43:53 UTC 2016
When using iohelper and sparse streams at once, we need a
protocol between iohelper and daemon to tell the other side to
represent received data in some fashion (e.g. whether it is raw
data, or a size of hole). In this patch, virFDStreamDrv tracks
whether the assumption from the first line stands.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/fdstream.c | 32 +++++++++++++++++++++-----------
src/fdstream.h | 3 ++-
src/storage/storage_backend.c | 6 ++++--
3 files changed, 27 insertions(+), 14 deletions(-)
diff --git a/src/fdstream.c b/src/fdstream.c
index be94325..911fac0 100644
--- a/src/fdstream.c
+++ b/src/fdstream.c
@@ -60,6 +60,7 @@ struct virFDStreamData {
virCommandPtr cmd;
unsigned long long offset;
unsigned long long length;
+ bool formatted; /* True if formatted messages are read from/written to @fd. */
int watch;
int events; /* events the stream callback is subscribed for */
@@ -566,7 +567,8 @@ static int virFDStreamOpenInternal(virStreamPtr st,
int fd,
virCommandPtr cmd,
int errfd,
- unsigned long long length)
+ unsigned long long length,
+ bool formatted)
{
virFDStreamDataPtr fdst;
@@ -589,6 +591,7 @@ static int virFDStreamOpenInternal(virStreamPtr st,
fdst->cmd = cmd;
fdst->errfd = errfd;
fdst->length = length;
+ fdst->formatted = formatted;
st->driver = &virFDStreamDrv;
st->privateData = fdst;
@@ -600,7 +603,7 @@ static int virFDStreamOpenInternal(virStreamPtr st,
int virFDStreamOpen(virStreamPtr st,
int fd)
{
- return virFDStreamOpenInternal(st, fd, NULL, -1, 0);
+ return virFDStreamOpenInternal(st, fd, NULL, -1, 0, false);
}
@@ -646,7 +649,7 @@ int virFDStreamConnectUNIX(virStreamPtr st,
goto error;
}
- if (virFDStreamOpenInternal(st, fd, NULL, -1, 0) < 0)
+ if (virFDStreamOpenInternal(st, fd, NULL, -1, 0, false) < 0)
goto error;
return 0;
@@ -672,7 +675,8 @@ virFDStreamOpenFileInternal(virStreamPtr st,
unsigned long long length,
int oflags,
int mode,
- bool forceIOHelper)
+ bool forceIOHelper,
+ bool sparse)
{
int fd = -1;
int childfd = -1;
@@ -680,6 +684,7 @@ virFDStreamOpenFileInternal(virStreamPtr st,
virCommandPtr cmd = NULL;
int errfd = -1;
char *iohelper_path = NULL;
+ bool formatted = false;
VIR_DEBUG("st=%p path=%s oflags=%x offset=%llu length=%llu mode=%o",
st, path, oflags, offset, length, mode);
@@ -750,6 +755,10 @@ virFDStreamOpenFileInternal(virStreamPtr st,
virCommandPassFD(cmd, fd,
VIR_COMMAND_PASS_FD_CLOSE_PARENT);
virCommandAddArgFormat(cmd, "%d", fd);
+ if (sparse) {
+ virCommandAddArg(cmd, "sparse");
+ formatted = true;
+ }
if ((oflags & O_ACCMODE) == O_RDONLY) {
childfd = fds[1];
@@ -768,7 +777,7 @@ virFDStreamOpenFileInternal(virStreamPtr st,
VIR_FORCE_CLOSE(childfd);
}
- if (virFDStreamOpenInternal(st, fd, cmd, errfd, length) < 0)
+ if (virFDStreamOpenInternal(st, fd, cmd, errfd, length, formatted) < 0)
goto error;
return 0;
@@ -798,7 +807,7 @@ int virFDStreamOpenFile(virStreamPtr st,
}
return virFDStreamOpenFileInternal(st, path,
offset, length,
- oflags, 0, false);
+ oflags, 0, false, false);
}
int virFDStreamCreateFile(virStreamPtr st,
@@ -811,7 +820,7 @@ int virFDStreamCreateFile(virStreamPtr st,
return virFDStreamOpenFileInternal(st, path,
offset, length,
oflags | O_CREAT, mode,
- false);
+ false, false);
}
#ifdef HAVE_CFMAKERAW
@@ -827,7 +836,7 @@ int virFDStreamOpenPTY(virStreamPtr st,
if (virFDStreamOpenFileInternal(st, path,
offset, length,
oflags | O_CREAT, 0,
- false) < 0)
+ false, false) < 0)
return -1;
fdst = st->privateData;
@@ -864,7 +873,7 @@ int virFDStreamOpenPTY(virStreamPtr st,
return virFDStreamOpenFileInternal(st, path,
offset, length,
oflags | O_CREAT, 0,
- false);
+ false, false);
}
#endif /* !HAVE_CFMAKERAW */
@@ -872,11 +881,12 @@ int virFDStreamOpenBlockDevice(virStreamPtr st,
const char *path,
unsigned long long offset,
unsigned long long length,
- int oflags)
+ int oflags,
+ bool sparse)
{
return virFDStreamOpenFileInternal(st, path,
offset, length,
- oflags, 0, true);
+ oflags, 0, true, sparse);
}
int virFDStreamSetInternalCloseCb(virStreamPtr st,
diff --git a/src/fdstream.h b/src/fdstream.h
index 2c913ea..bfdebc2 100644
--- a/src/fdstream.h
+++ b/src/fdstream.h
@@ -60,7 +60,8 @@ int virFDStreamOpenBlockDevice(virStreamPtr st,
const char *path,
unsigned long long offset,
unsigned long long length,
- int oflags);
+ int oflags,
+ bool sparse);
int virFDStreamSetInternalCloseCb(virStreamPtr st,
virFDStreamInternalCloseCb cb,
diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index 19d5cd5..fac5b64 100644
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -2029,6 +2029,7 @@ virStorageBackendVolUploadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
char *target_path = vol->target.path;
int ret = -1;
int has_snap = 0;
+ bool sparse = flags & VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM;
virCheckFlags(VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM, -1);
@@ -2056,7 +2057,7 @@ virStorageBackendVolUploadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
/* Not using O_CREAT because the file is required to already exist at
* this point */
ret = virFDStreamOpenBlockDevice(stream, target_path,
- offset, len, O_WRONLY);
+ offset, len, O_WRONLY, sparse);
cleanup:
VIR_FREE(path);
@@ -2076,6 +2077,7 @@ virStorageBackendVolDownloadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
char *target_path = vol->target.path;
int ret = -1;
int has_snap = 0;
+ bool sparse = flags & VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM;
virCheckFlags(VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM, -1);
@@ -2095,7 +2097,7 @@ virStorageBackendVolDownloadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
}
ret = virFDStreamOpenBlockDevice(stream, target_path,
- offset, len, O_RDONLY);
+ offset, len, O_RDONLY, sparse);
cleanup:
VIR_FREE(path);
--
2.8.4
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