JezK
Edit File: blktrace_api.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef BLKTRACE_H #define BLKTRACE_H #include <linux/types.h> /* * Trace categories */ enum blktrace_cat { BLK_TC_READ = 1 << 0, /* reads */ BLK_TC_WRITE = 1 << 1, /* writes */ BLK_TC_FLUSH = 1 << 2, /* flush */ BLK_TC_SYNC = 1 << 3, /* sync IO */ BLK_TC_SYNCIO = BLK_TC_SYNC, BLK_TC_QUEUE = 1 << 4, /* queueing/merging */ BLK_TC_REQUEUE = 1 << 5, /* requeueing */ BLK_TC_ISSUE = 1 << 6, /* issue */ BLK_TC_COMPLETE = 1 << 7, /* completions */ BLK_TC_FS = 1 << 8, /* fs requests */ BLK_TC_PC = 1 << 9, /* pc requests */ BLK_TC_NOTIFY = 1 << 10, /* special message */ BLK_TC_AHEAD = 1 << 11, /* readahead */ BLK_TC_META = 1 << 12, /* metadata */ BLK_TC_DISCARD = 1 << 13, /* discard requests */ BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */ BLK_TC_FUA = 1 << 15, /* fua requests */ BLK_TC_END = 1 << 15, /* we've run out of bits! */ }; #define BLK_TC_SHIFT (16) #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) /* * Basic trace actions */ enum blktrace_act { __BLK_TA_QUEUE = 1, /* queued */ __BLK_TA_BACKMERGE, /* back merged to existing rq */ __BLK_TA_FRONTMERGE, /* front merge to existing rq */ __BLK_TA_GETRQ, /* allocated new request */ __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ __BLK_TA_REQUEUE, /* request requeued */ __BLK_TA_ISSUE, /* sent to driver */ __BLK_TA_COMPLETE, /* completed by driver */ __BLK_TA_PLUG, /* queue was plugged */ __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */ __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */ __BLK_TA_INSERT, /* insert request */ __BLK_TA_SPLIT, /* bio was split */ __BLK_TA_BOUNCE, /* bio was bounced */ __BLK_TA_REMAP, /* bio was remapped */ __BLK_TA_ABORT, /* request aborted */ __BLK_TA_DRV_DATA, /* driver-specific binary data */ __BLK_TA_CGROUP = 1 << 8, /* from a cgroup*/ }; /* * Notify events. */ enum blktrace_notify { __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ __BLK_TN_TIMESTAMP, /* include system clock */ __BLK_TN_MESSAGE, /* Character string message */ __BLK_TN_CGROUP = __BLK_TA_CGROUP, /* from a cgroup */ }; /* * Trace actions in full. Additionally, read or write is masked */ #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) #define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_SPLIT (__BLK_TA_SPLIT) #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE)) #define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA)) #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) #define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY)) #define BLK_IO_TRACE_MAGIC 0x65617400 #define BLK_IO_TRACE_VERSION 0x07 /* * The trace itself */ struct blk_io_trace { __u32 magic; /* MAGIC << 8 | version */ __u32 sequence; /* event number */ __u64 time; /* in nanoseconds */ __u64 sector; /* disk offset */ __u32 bytes; /* transfer length */ __u32 action; /* what happened */ __u32 pid; /* who did it */ __u32 device; /* device number */ __u32 cpu; /* on what cpu did it happen */ __u16 error; /* completion error */ __u16 pdu_len; /* length of data after this trace */ /* cgroup id will be stored here if exists */ }; /* * The remap event */ struct blk_io_trace_remap { __be32 device_from; __be32 device_to; __be64 sector_from; }; enum { Blktrace_setup = 1, Blktrace_running, Blktrace_stopped, }; #define BLKTRACE_BDEV_SIZE 32 /* * User setup structure passed with BLKTRACESETUP */ struct blk_user_trace_setup { char name[BLKTRACE_BDEV_SIZE]; /* output */ __u16 act_mask; /* input */ __u32 buf_size; /* input */ __u32 buf_nr; /* input */ __u64 start_lba; __u64 end_lba; __u32 pid; }; #endif /* BLKTRACE_H */