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hw/9pfs: Reset server state during TVERSION

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As per the 9p rfc, during TVERSION its necessary to clean all the active
fids, so that we start the session from a clean state. Its also needed in
scenarios where the guest is booting off 9p, and boot fails, and client
restarts, without any knowledge of the past, it will issue a TVERSION again
so this ensures that we always start from a clean state.

Signed-off-by: Deepak C Shetty <deepakcs@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Deepak C Shetty 2011-12-04 22:35:28 +05:30 committed by Aneesh Kumar K.V
parent e9a0152ba1
commit b41e2992b2
1 changed files with 26 additions and 0 deletions
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26
hw/9pfs/virtio-9p.c
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@ -523,6 +523,30 @@ static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
return 0;
}
static void virtfs_reset(V9fsPDU *pdu)
{
V9fsState *s = pdu->s;
V9fsFidState *fidp = NULL;
/* Free all fids */
while (s->fid_list) {
fidp = s->fid_list;
s->fid_list = fidp->next;
if (fidp->ref) {
fidp->clunked = 1;
} else {
free_fid(pdu, fidp);
}
}
if (fidp) {
/* One or more unclunked fids found... */
error_report("9pfs:%s: One or more uncluncked fids "
"found during reset", __func__);
}
return;
}
#define P9_QID_TYPE_DIR 0x80
#define P9_QID_TYPE_SYMLINK 0x02
@ -1196,6 +1220,8 @@ static void v9fs_version(void *opaque)
pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data);
virtfs_reset(pdu);
if (!strcmp(version.data, "9P2000.u")) {
s->proto_version = V9FS_PROTO_2000U;
} else if (!strcmp(version.data, "9P2000.L")) {