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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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10
fsdev/qemu-fsdev.c
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@ -34,6 +34,8 @@ int qemu_fsdev_add(QemuOpts *opts)
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 @@ int qemu_fsdev_add(QemuOpts *opts)
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)