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xen/xenbus: Add 'will_handle' callback support in xenbus_watch_path()

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commit 2e85d32b1c865bec703ce0c962221a5e955c52c2 upstream.

Some code does not directly make 'xenbus_watch' object and call
'register_xenbus_watch()' but use 'xenbus_watch_path()' instead.  This
commit adds support of 'will_handle' callback in the
'xenbus_watch_path()' and it's wrapper, 'xenbus_watch_pathfmt()'.

This is part of XSA-349

Cc: [email protected]
Signed-off-by: SeongJae Park <[email protected]>
Reported-by: Michael Kurth <[email protected]>
Reported-by: Pawel Wieczorkiewicz <[email protected]>
Reviewed-by: Juergen Gross <[email protected]>
Signed-off-by: Juergen Gross <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
SeongJae Park 2020-12-14 10:04:18 +01:00 • committed by Greg Kroah-Hartman
commit 7da6db982e
6 changed files with 17 additions and 7 deletions
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6
include/xen/xenbus.h
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@ -199,10 +199,14 @@ void xenbus_probe(struct work_struct *);
int xenbus_watch_path(struct xenbus_device *dev, const char *path,
struct xenbus_watch *watch,
bool (*will_handle)(struct xenbus_watch *,
const char *, const char *),
void (*callback)(struct xenbus_watch *,
const char *, const char *));
__printf(4, 5)
__printf(5, 6)
int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch,
bool (*will_handle)(struct xenbus_watch *,
const char *, const char *),
void (*callback)(struct xenbus_watch *,
const char *, const char *),
const char *pathfmt, ...);