[virtio-9p] Introduce server side TFSYNC/RFSYNC for dotl
SYNOPSIS size[4] Tfsync tag[2] fid[4] size[4] Rfsync tag[2] DESCRIPTION The Tfsync transaction transfers ("flushes") all modified in-core data of file identified by fid to the disk device (or other permanent storage device) where that file resides. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
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@ -535,6 +535,13 @@ void pprint_pdu(V9fsPDU *pdu)
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case P9_RCLUNK:
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fprintf(llogfile, "RCLUNK: (");
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break;
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case P9_TFSYNC:
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fprintf(llogfile, "TFSYNC: (");
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pprint_int32(pdu, 0, &offset, "fid");
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break;
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case P9_RFSYNC:
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fprintf(llogfile, "RFSYNC: (");
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break;
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case P9_TLINK:
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fprintf(llogfile, "TLINK: (");
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pprint_int32(pdu, 0, &offset, "fid");
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@ -1837,6 +1837,32 @@ out:
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qemu_free(vs);
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}
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static void v9fs_post_do_fsync(V9fsState *s, V9fsPDU *pdu, int err)
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{
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if (err == -1) {
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err = -errno;
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}
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complete_pdu(s, pdu, err);
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}
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static void v9fs_fsync(V9fsState *s, V9fsPDU *pdu)
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{
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int32_t fid;
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size_t offset = 7;
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V9fsFidState *fidp;
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int err;
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pdu_unmarshal(pdu, offset, "d", &fid);
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fidp = lookup_fid(s, fid);
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if (fidp == NULL) {
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err = -ENOENT;
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v9fs_post_do_fsync(s, pdu, err);
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return;
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}
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err = v9fs_do_fsync(s, fidp->fs.fd);
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v9fs_post_do_fsync(s, pdu, err);
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}
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static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu)
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{
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int32_t fid;
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@ -3514,6 +3540,7 @@ static pdu_handler_t *pdu_handlers[] = {
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[P9_TSTAT] = v9fs_stat,
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[P9_TWALK] = v9fs_walk,
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[P9_TCLUNK] = v9fs_clunk,
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[P9_TFSYNC] = v9fs_fsync,
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[P9_TOPEN] = v9fs_open,
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[P9_TREAD] = v9fs_read,
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#if 0
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@ -37,6 +37,8 @@ enum {
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P9_RXATTRCREATE,
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P9_TREADDIR = 40,
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P9_RREADDIR,
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P9_TFSYNC = 50,
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P9_RFSYNC,
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P9_TLOCK = 52,
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P9_RLOCK,
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P9_TGETLOCK = 54,
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