d152c682f0
Replace the magic lookup through the kobject tree with an explicit
backpointer, given that the device model links are set up and torn
down at times when I/O is still possible, leading to potential
NULL or invalid pointer dereferences.
Fixes: edb0872f44 ("block: move the bdi from the request_queue to the gendisk")
Reported-by: syzbot <syzbot+aa0801b6b32dca9dda82@syzkaller.appspotmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Sven Schnelle <svens@linux.ibm.com>
Link: https://lore.kernel.org/r/20210816134624.GA24234@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM kyber
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#if !defined(_TRACE_KYBER_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_KYBER_H
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#include <linux/blkdev.h>
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#include <linux/tracepoint.h>
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#define DOMAIN_LEN 16
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#define LATENCY_TYPE_LEN 8
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TRACE_EVENT(kyber_latency,
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TP_PROTO(struct request_queue *q, const char *domain, const char *type,
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unsigned int percentile, unsigned int numerator,
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unsigned int denominator, unsigned int samples),
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TP_ARGS(q, domain, type, percentile, numerator, denominator, samples),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__array( char, domain, DOMAIN_LEN )
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__array( char, type, LATENCY_TYPE_LEN )
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__field( u8, percentile )
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__field( u8, numerator )
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__field( u8, denominator )
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__field( unsigned int, samples )
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),
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TP_fast_assign(
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__entry->dev = disk_devt(q->disk);
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strlcpy(__entry->domain, domain, sizeof(__entry->domain));
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strlcpy(__entry->type, type, sizeof(__entry->type));
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__entry->percentile = percentile;
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__entry->numerator = numerator;
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__entry->denominator = denominator;
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__entry->samples = samples;
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),
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TP_printk("%d,%d %s %s p%u %u/%u samples=%u",
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MAJOR(__entry->dev), MINOR(__entry->dev), __entry->domain,
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__entry->type, __entry->percentile, __entry->numerator,
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__entry->denominator, __entry->samples)
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);
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TRACE_EVENT(kyber_adjust,
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TP_PROTO(struct request_queue *q, const char *domain,
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unsigned int depth),
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TP_ARGS(q, domain, depth),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__array( char, domain, DOMAIN_LEN )
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__field( unsigned int, depth )
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),
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TP_fast_assign(
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__entry->dev = disk_devt(q->disk);
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strlcpy(__entry->domain, domain, sizeof(__entry->domain));
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__entry->depth = depth;
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),
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TP_printk("%d,%d %s %u",
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MAJOR(__entry->dev), MINOR(__entry->dev), __entry->domain,
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__entry->depth)
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);
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TRACE_EVENT(kyber_throttled,
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TP_PROTO(struct request_queue *q, const char *domain),
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TP_ARGS(q, domain),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__array( char, domain, DOMAIN_LEN )
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),
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TP_fast_assign(
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__entry->dev = disk_devt(q->disk);
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strlcpy(__entry->domain, domain, sizeof(__entry->domain));
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),
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TP_printk("%d,%d %s", MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->domain)
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);
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#define _TRACE_KYBER_H
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#endif /* _TRACE_KYBER_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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