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

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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>
This commit is contained in:
Aneesh Kumar K.V 2011-10-12 19:11:23 +05:30
parent 5745e38afe
commit d3ab98e691
10 changed files with 91 additions and 17 deletions
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12
vl.c
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@ -2785,6 +2785,7 @@ int main(int argc, char **argv, char **envp)
case QEMU_OPTION_virtfs: {
QemuOpts *fsdev;
QemuOpts *device;
const char *writeout;
olist = qemu_find_opts("virtfs");
if (!olist) {
@ -2814,6 +2815,17 @@ int main(int argc, char **argv, char **envp)
qemu_opt_get(opts, "mount_tag"));
exit(1);
}
writeout = qemu_opt_get(opts, "writeout");
if (writeout) {
#ifdef CONFIG_SYNC_FILE_RANGE
qemu_opt_set(fsdev, "writeout", writeout);
#else
fprintf(stderr, "writeout=immediate not supported on "
"this platform\n");
exit(1);
#endif
}
qemu_opt_set(fsdev, "fstype", qemu_opt_get(opts, "fstype"));
qemu_opt_set(fsdev, "path", qemu_opt_get(opts, "path"));
qemu_opt_set(fsdev, "security_model",