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Watch IDs are allocated from incrementing a int counter against the QFileMonitor object. In very long life QEMU processes with a huge amount of USB MTP activity creating & deleting directories it is just about conceivable that the int counter can wrap around. This would result in incorrect behaviour of the file monitor watch APIs due to clashing watch IDs. Instead of trying to detect this situation, this patch changes the way watch IDs are allocated. It is turned into an int64_t variable where the high 32 bits are set from the underlying inotify "int" ID. This gives an ID that is guaranteed unique for the directory as a whole, and we can rely on the kernel to enforce this. QFileMonitor then sets the low 32 bits from a per-directory counter. The USB MTP device only sets watches on the directory as a whole, not files within, so there is no risk of guest triggered wrap around on the low 32 bits. Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
81 lines
5.1 KiB
Plaintext
81 lines
5.1 KiB
Plaintext
# See docs/devel/tracing.txt for syntax documentation.
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# aio-posix.c
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run_poll_handlers_begin(void *ctx, int64_t max_ns, int64_t timeout) "ctx %p max_ns %"PRId64 " timeout %"PRId64
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run_poll_handlers_end(void *ctx, bool progress, int64_t timeout) "ctx %p progress %d new timeout %"PRId64
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poll_shrink(void *ctx, int64_t old, int64_t new) "ctx %p old %"PRId64" new %"PRId64
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poll_grow(void *ctx, int64_t old, int64_t new) "ctx %p old %"PRId64" new %"PRId64
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# async.c
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aio_co_schedule(void *ctx, void *co) "ctx %p co %p"
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aio_co_schedule_bh_cb(void *ctx, void *co) "ctx %p co %p"
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# thread-pool.c
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thread_pool_submit(void *pool, void *req, void *opaque) "pool %p req %p opaque %p"
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thread_pool_complete(void *pool, void *req, void *opaque, int ret) "pool %p req %p opaque %p ret %d"
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thread_pool_cancel(void *req, void *opaque) "req %p opaque %p"
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# buffer.c
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buffer_resize(const char *buf, size_t olen, size_t len) "%s: old %zd, new %zd"
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buffer_move_empty(const char *buf, size_t len, const char *from) "%s: %zd bytes from %s"
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buffer_move(const char *buf, size_t len, const char *from) "%s: %zd bytes from %s"
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buffer_free(const char *buf, size_t len) "%s: capacity %zd"
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# filemonitor-inotify.c
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qemu_file_monitor_add_watch(void *mon, const char *dirpath, const char *filename, void *cb, void *opaque, int64_t id) "File monitor %p add watch dir='%s' file='%s' cb=%p opaque=%p id=%" PRId64
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qemu_file_monitor_remove_watch(void *mon, const char *dirpath, int64_t id) "File monitor %p remove watch dir='%s' id=%" PRId64
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qemu_file_monitor_new(void *mon, int fd) "File monitor %p created fd=%d"
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qemu_file_monitor_enable_watch(void *mon, const char *dirpath, int id) "File monitor %p enable watch dir='%s' id=%u"
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qemu_file_monitor_disable_watch(void *mon, const char *dirpath, int id) "Fle monitor %p disable watch dir='%s' id=%u"
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qemu_file_monitor_event(void *mon, const char *dirpath, const char *filename, int mask, unsigned int id) "File monitor %p event dir='%s' file='%s' mask=0x%x id=%u"
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qemu_file_monitor_dispatch(void *mon, const char *dirpath, const char *filename, int ev, void *cb, void *opaque, int64_t id) "File monitor %p dispatch dir='%s' file='%s' ev=%d cb=%p opaque=%p id=%" PRId64
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# qemu-coroutine.c
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qemu_aio_coroutine_enter(void *ctx, void *from, void *to, void *opaque) "ctx %p from %p to %p opaque %p"
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qemu_coroutine_yield(void *from, void *to) "from %p to %p"
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qemu_coroutine_terminate(void *co) "self %p"
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# qemu-coroutine-lock.c
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qemu_co_mutex_lock_uncontended(void *mutex, void *self) "mutex %p self %p"
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qemu_co_mutex_lock_entry(void *mutex, void *self) "mutex %p self %p"
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qemu_co_mutex_lock_return(void *mutex, void *self) "mutex %p self %p"
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qemu_co_mutex_unlock_entry(void *mutex, void *self) "mutex %p self %p"
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qemu_co_mutex_unlock_return(void *mutex, void *self) "mutex %p self %p"
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# oslib-win32.c
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# oslib-posix.c
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qemu_memalign(size_t alignment, size_t size, void *ptr) "alignment %zu size %zu ptr %p"
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qemu_anon_ram_alloc(size_t size, void *ptr) "size %zu ptr %p"
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qemu_vfree(void *ptr) "ptr %p"
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qemu_anon_ram_free(void *ptr, size_t size) "ptr %p size %zu"
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# hbitmap.c
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hbitmap_iter_skip_words(const void *hb, void *hbi, uint64_t pos, unsigned long cur) "hb %p hbi %p pos %"PRId64" cur 0x%lx"
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hbitmap_reset(void *hb, uint64_t start, uint64_t count, uint64_t sbit, uint64_t ebit) "hb %p items %"PRIu64",%"PRIu64" bits %"PRIu64"..%"PRIu64
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hbitmap_set(void *hb, uint64_t start, uint64_t count, uint64_t sbit, uint64_t ebit) "hb %p items %"PRIu64",%"PRIu64" bits %"PRIu64"..%"PRIu64
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# lockcnt.c
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lockcnt_fast_path_attempt(const void *lockcnt, int expected, int new) "lockcnt %p fast path %d->%d"
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lockcnt_fast_path_success(const void *lockcnt, int expected, int new) "lockcnt %p fast path %d->%d succeeded"
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lockcnt_unlock_attempt(const void *lockcnt, int expected, int new) "lockcnt %p unlock %d->%d"
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lockcnt_unlock_success(const void *lockcnt, int expected, int new) "lockcnt %p unlock %d->%d succeeded"
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lockcnt_futex_wait_prepare(const void *lockcnt, int expected, int new) "lockcnt %p preparing slow path %d->%d"
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lockcnt_futex_wait(const void *lockcnt, int val) "lockcnt %p waiting on %d"
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lockcnt_futex_wait_resume(const void *lockcnt, int new) "lockcnt %p after wait: %d"
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lockcnt_futex_wake(const void *lockcnt) "lockcnt %p waking up one waiter"
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# qemu-thread-common.h
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qemu_mutex_lock(void *mutex, const char *file, const int line) "waiting on mutex %p (%s:%d)"
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qemu_mutex_locked(void *mutex, const char *file, const int line) "taken mutex %p (%s:%d)"
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qemu_mutex_unlock(void *mutex, const char *file, const int line) "released mutex %p (%s:%d)"
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# vfio-helpers.c
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qemu_vfio_dma_reset_temporary(void *s) "s %p"
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qemu_vfio_ram_block_added(void *s, void *p, size_t size) "s %p host %p size 0x%zx"
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qemu_vfio_ram_block_removed(void *s, void *p, size_t size) "s %p host %p size 0x%zx"
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qemu_vfio_find_mapping(void *s, void *p) "s %p host %p"
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qemu_vfio_new_mapping(void *s, void *host, size_t size, int index, uint64_t iova) "s %p host %p size %zu index %d iova 0x%"PRIx64
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qemu_vfio_do_mapping(void *s, void *host, size_t size, uint64_t iova) "s %p host %p size %zu iova 0x%"PRIx64
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qemu_vfio_dma_map(void *s, void *host, size_t size, bool temporary, uint64_t *iova) "s %p host %p size %zu temporary %d iova %p"
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qemu_vfio_dma_unmap(void *s, void *host) "s %p host %p"
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