commit d3ab98e6919e9491f8ed7ffe37af73d35a55e1ca
author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Wed Oct 12 19:11:23 2011 +0530
committer Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Wed Oct 12 19:11:23 2011 +0530
tree 0e805d6c9a58229dbc51f92b3ff3ee9d430e1c02
parent 5745e38afeaa15153c2209674fe37e1cbdd65707

hw/9pfs: Add new virtfs option writeout=immediate skip host page cache

writeout=immediate implies the after pwritev we do a sync_file_range.

Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

fsdev/file-op-9p.h

diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
index 8de8abf..af3ecbe 100644
--- a/fsdev/file-op-9p.h
+++ b/fsdev/file-op-9p.h
@@ -53,12 +53,16 @@
 /* FsContext flag values */
 #define PATHNAME_FSCONTEXT 0x1
 
+/* export flags */
+#define V9FS_IMMEDIATE_WRITEOUT 0x1
+
 typedef struct FsContext
 {
     int flags;
     char *fs_root;
     SecModel fs_sm;
     uid_t uid;
+    int export_flags;
     struct xattr_operations **xops;
     /* fs driver specific data */
     void *private;

fsdev/qemu-fsdev.c

diff --git a/fsdev/qemu-fsdev.c b/fsdev/qemu-fsdev.c
index 768819f..946bad7 100644
--- a/fsdev/qemu-fsdev.c
+++ b/fsdev/qemu-fsdev.c
@@ -34,6 +34,8 @@
     const char *fstype = qemu_opt_get(opts, "fstype");
     const char *path = qemu_opt_get(opts, "path");
     const char *sec_model = qemu_opt_get(opts, "security_model");
+    const char *writeout = qemu_opt_get(opts, "writeout");
+
 
     if (!fsdev_id) {
         fprintf(stderr, "fsdev: No id specified\n");
@@ -72,10 +74,14 @@
     fsle->fse.path = g_strdup(path);
     fsle->fse.security_model = g_strdup(sec_model);
     fsle->fse.ops = FsTypes[i].ops;
-
+    fsle->fse.export_flags = 0;
+    if (writeout) {
+        if (!strcmp(writeout, "immediate")) {
+            fsle->fse.export_flags = V9FS_IMMEDIATE_WRITEOUT;
+        }
+    }
     QTAILQ_INSERT_TAIL(&fstype_entries, fsle, next);
     return 0;
-
 }
 
 FsTypeEntry *get_fsdev_fsentry(char *id)

fsdev/qemu-fsdev.h

diff --git a/fsdev/qemu-fsdev.h b/fsdev/qemu-fsdev.h
index e04931a..3b2feb4 100644
--- a/fsdev/qemu-fsdev.h
+++ b/fsdev/qemu-fsdev.h
@@ -41,6 +41,7 @@
     char *fsdev_id;
     char *path;
     char *security_model;
+    int export_flags;
     FileOperations *ops;
 } FsTypeEntry;