Luis Chamberlain b431ef837e blktrace: ensure our debugfs dir exists ... 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>		2020-06-24 09:15:58 -06:00
..
blktrace.c	blktrace: ensure our debugfs dir exists	2020-06-24 09:15:58 -06:00
bpf_trace.c	maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault	2020-06-17 10:57:41 -07:00
fgraph.c	tracing: Define MCOUNT_INSN_SIZE when not defined without direct calls	2020-01-02 21:56:44 -05:00
ftrace_internal.h	x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up	2020-05-12 18:24:34 -04:00
ftrace.c	ftrace: Fix maybe-uninitialized compiler warning	2020-06-17 17:13:18 -04:00
Kconfig	Tracing updates for 5.8:	2020-06-09 10:06:18 -07:00
kprobe_event_gen_test.c	tracing: Add kprobe event command generation test module	2020-01-30 09:46:28 -05:00
Makefile	Rebase locking/kcsan to locking/urgent	2020-06-11 20:02:46 +02:00
power-traces.c
preemptirq_delay_test.c	tracing: Wait for preempt irq delay thread to execute	2020-05-11 17:00:34 -04:00
ring_buffer_benchmark.c	tracing: Make struct ring_buffer less ambiguous	2020-01-13 13:19:38 -05:00
ring_buffer.c	ring-buffer: Remove all BUG() calls	2020-05-14 08:51:02 -04:00
rpm-traces.c
synth_event_gen_test.c	tracing: Have synthetic event test use raw_smp_processor_id()	2020-02-20 17:43:41 -05:00
trace_benchmark.c	trace: Use pr_warn instead of pr_warning	2019-10-18 15:01:57 +02:00
trace_benchmark.h
trace_boot.c	tracing/boottime: Fix kprobe event API usage	2020-05-06 09:04:11 -04:00
trace_branch.c	tracing: Make struct ring_buffer less ambiguous	2020-01-13 13:19:38 -05:00
trace_clock.c
trace_dynevent.c	tracing: Use seq_buf for building dynevent_cmd string	2020-02-01 13:10:15 -05:00
trace_dynevent.h	tracing: Remove check_arg() callbacks from dynevent args	2020-02-01 13:09:23 -05:00
trace_entries.h	tracing: Make ftrace packed events have align of 1	2020-06-16 21:21:02 -04:00
trace_event_perf.c	Merge branch 'perf/urgent' into perf/core, to pick up fixes	2019-10-28 12:38:26 +01:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Avoid memory leak in process_system_preds()	2019-12-19 18:24:17 -05:00
trace_events_hist.c	tracing: Move synthetic events to a separate file	2020-06-01 08:23:22 -04:00
trace_events_inject.c	tracing: Initialize val to zero in parse_entry of inject code	2020-01-02 19:04:57 -05:00
trace_events_synth.c	tracing: Move synthetic events to a separate file	2020-06-01 08:23:22 -04:00
trace_events_trigger.c	tracing: Fix the race between registering 'snapshot' event trigger and triggering 'snapshot' operation	2020-04-14 22:02:10 -04:00
trace_events.c	tracing: Add hist_debug trace event files for histogram debugging	2020-06-01 08:22:30 -04:00
trace_export.c	tracing: Make ftrace packed events have align of 1	2020-06-16 21:21:02 -04:00
trace_functions_graph.c	ring-buffer: Rename ring_buffer_read() to read_buffer_iter_advance()	2020-03-19 19:11:19 -04:00
trace_functions.c	trace: Fix typo in allocate_ftrace_ops()'s comment	2020-06-16 21:21:02 -04:00
trace_hwlat.c	tracing: Have hwlat ts be first instance and record count of instances	2020-03-03 17:33:43 -05:00
trace_irqsoff.c	tracing: Rename trace_buffer to array_buffer	2020-01-13 13:19:38 -05:00
trace_kdb.c	tracing: Rename trace_buffer to array_buffer	2020-01-13 13:19:38 -05:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault	2020-06-17 10:57:41 -07:00
trace_mmiotrace.c	tracing: Make struct ring_buffer less ambiguous	2020-01-13 13:19:38 -05:00
trace_nop.c
trace_output.c	mmap locking API: use coccinelle to convert mmap_sem rwsem call sites	2020-06-09 09:39:14 -07:00
trace_output.h
trace_preemptirq.c	x86/entry: Rename trace_hardirqs_off_prepare()	2020-06-11 15:15:24 +02:00
trace_printk.c	tracing: Add locked_down checks to the open calls of files created for tracefs	2019-10-12 20:48:06 -04:00
trace_probe_tmpl.h	tracing/probe: Support user-space dereference	2019-05-25 23:04:42 -04:00
trace_probe.c	tracing/probe: Fix memleak in fetch_op_data operations	2020-06-16 21:21:02 -04:00
trace_probe.h	tracing/probe: Replace zero-length array with flexible-array	2020-06-15 23:08:32 -05:00
trace_sched_switch.c	tracing: Fix sched switch start/stop refcount racy updates	2020-01-30 09:46:10 -05:00
trace_sched_wakeup.c	tracing: Make struct ring_buffer less ambiguous	2020-01-13 13:19:38 -05:00
trace_selftest_dynamic.c
trace_selftest.c	tracing: Rename trace_buffer to array_buffer	2020-01-13 13:19:38 -05:00
trace_seq.c	tracing: Remove unused TRACE_SEQ_BUF_USED	2020-01-21 18:39:54 -05:00
trace_stack.c	trace: fix an incorrect __user annotation on stack_trace_sysctl	2020-06-08 10:13:56 -04:00
trace_stat.c	tracing: Fix tracing_stat return values in error handling paths	2020-01-24 18:06:48 -05:00
trace_stat.h	tracing: Use generic type for comparator function	2019-11-14 13:15:11 -05:00
trace_synth.h	tracing: Move synthetic events to a separate file	2020-06-01 08:23:22 -04:00
trace_syscalls.c	Tracing updates:	2020-02-06 07:12:11 +00:00
trace_uprobe.c	tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes	2020-06-09 11:10:12 -07:00
trace.c	tracing: Remove unused event variable in tracing_iter_reset	2020-06-16 21:21:03 -04:00
trace.h	tracing: Make ftrace packed events have align of 1	2020-06-16 21:21:02 -04:00
tracing_map.c	tracing: Convert local functions in tracing_map.c to static	2020-04-22 22:07:26 -04:00
tracing_map.h