Luis Chamberlain ab2d90e58a blktrace: ensure our debugfs dir exists ... [ Upstream commit b431ef837e ] We make an assumption that a debugfs directory exists, but since this can fail ensure it exists before allowing blktrace setup to complete. Otherwise we end up stuffing blktrace files on the debugfs root directory. In the worst case scenario this *in theory* can create an eventual panic *iff* in the future a similarly named file is created prior on the debugfs root directory. This theoretical crash can happen due to a recursive removal followed by a specific dentry removal. This doesn't fix any known crash, however I have seen the files go into the main debugfs root directory in cases where the debugfs directory was not created due to other internal bugs with blktrace now fixed. blktrace is also completely useless without this directory, so this ensures to userspace we only setup blktrace if the kernel can stuff files where they are supposed to go into. debugfs directory creations typically aren't checked for, and we have maintainers doing sweep removals of these checks, but since we need this check to ensure proper userspace blktrace functionality we make sure to annotate the justification for the check. Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-09-03 11:26:42 +02:00
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Kconfig	Stop the ad-hoc games with -Wno-maybe-initialized	2020-05-20 08:20:28 +02:00
Makefile	…
blktrace.c	blktrace: ensure our debugfs dir exists	2020-09-03 11:26:42 +02:00
bpf_trace.c	…
fgraph.c	…
ftrace.c	tracing: Use trace_sched_process_free() instead of exit() for pid tracing	2020-08-21 13:05:27 +02:00
ftrace_internal.h	…
power-traces.c	…
preemptirq_delay_test.c	…
ring_buffer.c	ring-buffer: Zero out time extend if it is nested and not absolute	2020-06-30 15:37:10 -04:00
ring_buffer_benchmark.c	…
rpm-traces.c	…
trace.c	tracing: Move pipe reference to trace array instead of current_tracer	2020-08-21 13:05:27 +02:00
trace.h	tracing: Move pipe reference to trace array instead of current_tracer	2020-08-21 13:05:27 +02:00
trace_benchmark.c	…
trace_benchmark.h	…
trace_branch.c	…
trace_clock.c	…
trace_dynevent.c	…
trace_dynevent.h	…
trace_entries.h	…
trace_event_perf.c	…
trace_events.c	tracing: Use trace_sched_process_free() instead of exit() for pid tracing	2020-08-21 13:05:27 +02:00
trace_events_filter.c	…
trace_events_filter_test.h	…
trace_events_hist.c	…
trace_events_trigger.c	tracing: Fix event trigger to accept redundant spaces	2020-06-30 15:37:10 -04:00
trace_export.c	…
trace_functions.c	…
trace_functions_graph.c	…
trace_hwlat.c	tracing/hwlat: Honor the tracing_cpumask	2020-08-21 13:05:27 +02:00
trace_irqsoff.c	…
trace_kdb.c	…
trace_kprobe.c	tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes	2020-06-24 17:50:43 +02:00
trace_kprobe_selftest.c	…
trace_kprobe_selftest.h	…
trace_mmiotrace.c	…
trace_nop.c	…
trace_output.c	…
trace_output.h	…
trace_preemptirq.c	…
trace_printk.c	…
trace_probe.c	tracing/probe: Fix memleak in fetch_op_data operations	2020-06-24 17:50:51 +02:00
trace_probe.h	…
trace_probe_tmpl.h	…
trace_sched_switch.c	…
trace_sched_wakeup.c	…
trace_selftest.c	…
trace_selftest_dynamic.c	…
trace_seq.c	…
trace_stack.c	…
trace_stat.c	…
trace_stat.h	…
trace_syscalls.c	…
trace_uprobe.c	tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes	2020-06-24 17:50:43 +02:00
tracing_map.c	…
tracing_map.h	…