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path: root/hw/usb/dev-mtp.c
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Diffstat (limited to 'hw/usb/dev-mtp.c')
-rw-r--r--hw/usb/dev-mtp.c229
1 files changed, 229 insertions, 0 deletions
diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
index 5b71691753..def2f5ef3b 100644
--- a/hw/usb/dev-mtp.c
+++ b/hw/usb/dev-mtp.c
@@ -15,6 +15,10 @@
#include <sys/stat.h>
#include <sys/statvfs.h>
+#ifdef __linux__
+#include <sys/inotify.h>
+#include "qemu/main-loop.h"
+#endif
#include "qemu-common.h"
#include "qemu/iov.h"
@@ -62,6 +66,11 @@ enum mtp_code {
/* format codes */
FMT_UNDEFINED_OBJECT = 0x3000,
FMT_ASSOCIATION = 0x3001,
+
+ /* event codes */
+ EVT_OBJ_ADDED = 0x4002,
+ EVT_OBJ_REMOVED = 0x4003,
+ EVT_OBJ_INFO_CHANGED = 0x4007,
};
typedef struct {
@@ -84,6 +93,17 @@ enum {
EP_EVENT,
};
+#ifdef __linux__
+typedef struct MTPMonEntry MTPMonEntry;
+
+struct MTPMonEntry {
+ uint32_t event;
+ uint32_t handle;
+
+ QTAILQ_ENTRY(MTPMonEntry) next;
+};
+#endif
+
struct MTPControl {
uint16_t code;
uint32_t trans;
@@ -108,6 +128,10 @@ struct MTPObject {
char *name;
char *path;
struct stat stat;
+#ifdef __linux__
+ /* inotify watch cookie */
+ int watchfd;
+#endif
MTPObject *parent;
uint32_t nchildren;
QLIST_HEAD(, MTPObject) children;
@@ -129,6 +153,11 @@ struct MTPState {
uint32_t next_handle;
QTAILQ_HEAD(, MTPObject) objects;
+#ifdef __linux__
+ /* inotify descriptor */
+ int inotifyfd;
+ QTAILQ_HEAD(events, MTPMonEntry) events;
+#endif
};
#define TYPE_USB_MTP "usb-mtp"
@@ -372,6 +401,185 @@ static MTPObject *usb_mtp_add_child(MTPState *s, MTPObject *o,
return child;
}
+#ifdef __linux__
+static MTPObject *usb_mtp_object_lookup_name(MTPObject *parent,
+ char *name, int len)
+{
+ MTPObject *iter;
+
+ QLIST_FOREACH(iter, &parent->children, list) {
+ if (strncmp(iter->name, name, len) == 0) {
+ return iter;
+ }
+ }
+
+ return NULL;
+}
+
+static MTPObject *usb_mtp_object_lookup_wd(MTPState *s, int wd)
+{
+ MTPObject *iter;
+
+ QTAILQ_FOREACH(iter, &s->objects, next) {
+ if (iter->watchfd == wd) {
+ return iter;
+ }
+ }
+
+ return NULL;
+}
+
+static void inotify_watchfn(void *arg)
+{
+ MTPState *s = arg;
+ ssize_t bytes;
+ /* From the man page: atleast one event can be read */
+ int len = sizeof(struct inotify_event) + NAME_MAX + 1;
+ int pos;
+ char buf[len];
+
+ for (;;) {
+ bytes = read(s->inotifyfd, buf, len);
+ pos = 0;
+
+ if (bytes <= 0) {
+ /* Better luck next time */
+ return;
+ }
+
+ /*
+ * TODO: Ignore initiator initiated events.
+ * For now we are good because the store is RO
+ */
+ while (bytes > 0) {
+ char *p = buf + pos;
+ struct inotify_event *event = (struct inotify_event *)p;
+ int watchfd = 0;
+ uint32_t mask = event->mask & (IN_CREATE | IN_DELETE |
+ IN_MODIFY | IN_IGNORED);
+ MTPObject *parent = usb_mtp_object_lookup_wd(s, event->wd);
+ MTPMonEntry *entry = NULL;
+ MTPObject *o;
+
+ pos = pos + sizeof(struct inotify_event) + event->len;
+ bytes = bytes - pos;
+
+ if (!parent) {
+ continue;
+ }
+
+ switch (mask) {
+ case IN_CREATE:
+ if (usb_mtp_object_lookup_name
+ (parent, event->name, event->len)) {
+ /* Duplicate create event */
+ continue;
+ }
+ entry = g_new0(MTPMonEntry, 1);
+ entry->handle = s->next_handle;
+ entry->event = EVT_OBJ_ADDED;
+ o = usb_mtp_add_child(s, parent, event->name);
+ if (!o) {
+ g_free(entry);
+ continue;
+ }
+ o->watchfd = watchfd;
+ trace_usb_mtp_inotify_event(s->dev.addr, event->name,
+ event->mask, "Obj Added");
+ break;
+
+ case IN_DELETE:
+ /*
+ * The kernel issues a IN_IGNORED event
+ * when a dir containing a watchpoint is
+ * deleted, so we don't have to delete the
+ * watchpoint
+ */
+ o = usb_mtp_object_lookup_name(parent, event->name, event->len);
+ if (!o) {
+ continue;
+ }
+ entry = g_new0(MTPMonEntry, 1);
+ entry->handle = o->handle;
+ entry->event = EVT_OBJ_REMOVED;
+ usb_mtp_object_free(s, o);
+ trace_usb_mtp_inotify_event(s->dev.addr, o->path,
+ event->mask, "Obj Deleted");
+ break;
+
+ case IN_MODIFY:
+ o = usb_mtp_object_lookup_name(parent, event->name, event->len);
+ if (!o) {
+ continue;
+ }
+ entry = g_new0(MTPMonEntry, 1);
+ entry->handle = o->handle;
+ entry->event = EVT_OBJ_INFO_CHANGED;
+ trace_usb_mtp_inotify_event(s->dev.addr, o->path,
+ event->mask, "Obj Modified");
+ break;
+
+ case IN_IGNORED:
+ o = usb_mtp_object_lookup_name(parent, event->name, event->len);
+ trace_usb_mtp_inotify_event(s->dev.addr, o->path,
+ event->mask, "Obj ignored");
+ break;
+
+ default:
+ fprintf(stderr, "usb-mtp: failed to parse inotify event\n");
+ continue;
+ }
+
+ if (entry) {
+ QTAILQ_INSERT_HEAD(&s->events, entry, next);
+ }
+ }
+ }
+}
+
+static int usb_mtp_inotify_init(MTPState *s)
+{
+ int fd;
+
+ fd = inotify_init1(IN_NONBLOCK);
+ if (fd == -1) {
+ return 1;
+ }
+
+ QTAILQ_INIT(&s->events);
+ s->inotifyfd = fd;
+
+ qemu_set_fd_handler(fd, inotify_watchfn, NULL, s);
+
+ return 0;
+}
+
+static void usb_mtp_inotify_cleanup(MTPState *s)
+{
+ MTPMonEntry *e;
+
+ if (!s->inotifyfd) {
+ return;
+ }
+
+ qemu_set_fd_handler(s->inotifyfd, NULL, NULL, s);
+ close(s->inotifyfd);
+
+ QTAILQ_FOREACH(e, &s->events, next) {
+ QTAILQ_REMOVE(&s->events, e, next);
+ g_free(e);
+ }
+}
+
+static int usb_mtp_add_watch(int inotifyfd, char *path)
+{
+ uint32_t mask = IN_CREATE | IN_DELETE | IN_MODIFY |
+ IN_ISDIR;
+
+ return inotify_add_watch(inotifyfd, path, mask);
+}
+#endif
+
static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
{
struct dirent *entry;
@@ -386,6 +594,16 @@ static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
if (!dir) {
return;
}
+#ifdef __linux__
+ int watchfd = usb_mtp_add_watch(s->inotifyfd, o->path);
+ if (watchfd == -1) {
+ fprintf(stderr, "usb-mtp: failed to add watch for %s\n", o->path);
+ } else {
+ trace_usb_mtp_inotify_event(s->dev.addr, o->path,
+ 0, "Watch Added");
+ o->watchfd = watchfd;
+ }
+#endif
while ((entry = readdir(dir)) != NULL) {
usb_mtp_add_child(s, o, entry->d_name);
}
@@ -778,11 +996,19 @@ static void usb_mtp_command(MTPState *s, MTPControl *c)
trace_usb_mtp_op_open_session(s->dev.addr);
s->session = c->argv[0];
usb_mtp_object_alloc(s, s->next_handle++, NULL, s->root);
+#ifdef __linux__
+ if (usb_mtp_inotify_init(s)) {
+ fprintf(stderr, "usb-mtp: file monitoring init failed\n");
+ }
+#endif
break;
case CMD_CLOSE_SESSION:
trace_usb_mtp_op_close_session(s->dev.addr);
s->session = 0;
s->next_handle = 0;
+#ifdef __linux__
+ usb_mtp_inotify_cleanup(s);
+#endif
usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
assert(QTAILQ_EMPTY(&s->objects));
break;
@@ -908,6 +1134,9 @@ static void usb_mtp_handle_reset(USBDevice *dev)
trace_usb_mtp_reset(s->dev.addr);
+#ifdef __linux__
+ usb_mtp_inotify_cleanup(s);
+#endif
usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
s->session = 0;
usb_mtp_data_free(s->data_in);
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-28 18:07:23 +0000