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block: Enable qemu_open/close to work with fd sets

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When qemu_open is passed a filename of the "/dev/fdset/nnn"
format (where nnn is the fdset ID), an fd with matching access
mode flags will be searched for within the specified monitor
fd set.  If the fd is found, a dup of the fd will be returned
from qemu_open.

Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Corey Bryant 2012-08-14 16:43:47 -04:00 • committed by Kevin Wolf
parent 2e1e79dae7
commit adb696f3d8
9 changed files with 251 additions and 5 deletions
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86
monitor.c
View file

@ -154,6 +154,7 @@ typedef struct MonFdset MonFdset;
struct MonFdset {
int64_t id;
QLIST_HEAD(, MonFdsetFd) fds;
QLIST_HEAD(, MonFdsetFd) dup_fds;
QLIST_ENTRY(MonFdset) next;
};
@ -2398,7 +2399,7 @@ static void monitor_fdset_cleanup(MonFdset *mon_fdset)
}
}
if (QLIST_EMPTY(&mon_fdset->fds)) {
if (QLIST_EMPTY(&mon_fdset->fds) && QLIST_EMPTY(&mon_fdset->dup_fds)) {
QLIST_REMOVE(mon_fdset, next);
g_free(mon_fdset);
}
@ -2555,6 +2556,89 @@ FdsetInfoList *qmp_query_fdsets(Error **errp)
return fdset_list;
}
int monitor_fdset_get_fd(int64_t fdset_id, int flags)
{
MonFdset *mon_fdset;
MonFdsetFd *mon_fdset_fd;
int mon_fd_flags;
#ifndef _WIN32
QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
if (mon_fdset->id != fdset_id) {
continue;
}
QLIST_FOREACH(mon_fdset_fd, &mon_fdset->fds, next) {
mon_fd_flags = fcntl(mon_fdset_fd->fd, F_GETFL);
if (mon_fd_flags == -1) {
return -1;
}
if ((flags & O_ACCMODE) == (mon_fd_flags & O_ACCMODE)) {
return mon_fdset_fd->fd;
}
}
errno = EACCES;
return -1;
}
#endif
errno = ENOENT;
return -1;
}
int monitor_fdset_dup_fd_add(int64_t fdset_id, int dup_fd)
{
MonFdset *mon_fdset;
MonFdsetFd *mon_fdset_fd_dup;
QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
if (mon_fdset->id != fdset_id) {
continue;
}
QLIST_FOREACH(mon_fdset_fd_dup, &mon_fdset->dup_fds, next) {
if (mon_fdset_fd_dup->fd == dup_fd) {
return -1;
}
}
mon_fdset_fd_dup = g_malloc0(sizeof(*mon_fdset_fd_dup));
mon_fdset_fd_dup->fd = dup_fd;
QLIST_INSERT_HEAD(&mon_fdset->dup_fds, mon_fdset_fd_dup, next);
return 0;
}
return -1;
}
static int monitor_fdset_dup_fd_find_remove(int dup_fd, bool remove)
{
MonFdset *mon_fdset;
MonFdsetFd *mon_fdset_fd_dup;
QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
QLIST_FOREACH(mon_fdset_fd_dup, &mon_fdset->dup_fds, next) {
if (mon_fdset_fd_dup->fd == dup_fd) {
if (remove) {
QLIST_REMOVE(mon_fdset_fd_dup, next);
if (QLIST_EMPTY(&mon_fdset->dup_fds)) {
monitor_fdset_cleanup(mon_fdset);
}
}
return mon_fdset->id;
}
}
}
return -1;
}
int monitor_fdset_dup_fd_find(int dup_fd)
{
return monitor_fdset_dup_fd_find_remove(dup_fd, false);
}
int monitor_fdset_dup_fd_remove(int dup_fd)
{
return monitor_fdset_dup_fd_find_remove(dup_fd, true);
}
/* mon_cmds and info_cmds would be sorted at runtime */
static mon_cmd_t mon_cmds[] = {
#include "hmp-commands.h"