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r14926: change the inotify backend to implement the rather unusual semantics

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for rename. The cookies in inotify tell us (indirectly!) if its a
rename between directories or not
This commit is contained in:
Andrew Tridgell
2006-04-05 08:52:55 +00:00
committed by Gerald (Jerry) Carter
parent 2ac248edf0
commit 13574a8d0c
1 changed files with 28 additions and 4 deletions
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32
source/ntvfs/sysdep/inotify.c
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@@ -90,8 +90,13 @@ static int inotify_destructor(void *ptr)
/*
dispatch one inotify event
the cookies are used to correctly handle renames
*/
static void inotify_dispatch(struct inotify_private *in, struct inotify_event *e)
static void inotify_dispatch(struct inotify_private *in,
struct inotify_event *e,
uint32_t prev_cookie,
uint32_t next_cookie)
{
struct watch_context *w;
struct notify_event ne;
@@ -101,11 +106,24 @@ static void inotify_dispatch(struct inotify_private *in, struct inotify_event *e
return;
}
/* map the inotify mask to a action */
/* map the inotify mask to a action. This gets complicated for
renames */
if (e->mask & IN_CREATE) {
ne.action = NOTIFY_ACTION_ADDED;
} else if (e->mask & IN_DELETE) {
ne.action = NOTIFY_ACTION_REMOVED;
} else if (e->mask & IN_MOVED_FROM) {
if (e->cookie == next_cookie) {
ne.action = NOTIFY_ACTION_OLD_NAME;
} else {
ne.action = NOTIFY_ACTION_REMOVED;
}
} else if (e->mask & IN_MOVED_TO) {
if (e->cookie == prev_cookie) {
ne.action = NOTIFY_ACTION_NEW_NAME;
} else {
ne.action = NOTIFY_ACTION_ADDED;
}
} else {
ne.action = NOTIFY_ACTION_MODIFIED;
}
@@ -129,6 +147,7 @@ static void inotify_handler(struct event_context *ev, struct fd_event *fde,
struct inotify_private *in = talloc_get_type(private, struct inotify_private);
int bufsize = 0;
struct inotify_event *e0, *e;
uint32_t prev_cookie=0;
/*
we must use FIONREAD as we cannot predict the length of the
@@ -152,9 +171,14 @@ static void inotify_handler(struct event_context *ev, struct fd_event *fde,
/* we can get more than one event in the buffer */
while (bufsize >= sizeof(*e)) {
inotify_dispatch(in, e);
struct inotify_event *e2 = NULL;
bufsize -= e->len + sizeof(*e);
e = (struct inotify_event *)(e->len + sizeof(*e) + (char *)e);
if (bufsize >= sizeof(*e)) {
e2 = (struct inotify_event *)(e->len + sizeof(*e) + (char *)e);
}
inotify_dispatch(in, e, prev_cookie, e2?e2->cookie:0);
prev_cookie = e->cookie;
e = e2;
}
talloc_free(e0);