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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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ef295ecf09
Now that we don't need the common flags to overflow outside the range of a 32-bit type we can encode them the same way for both the bio and request fields. This in addition allows us to place the operation first (and make some room for more ops while we're at it) and to stop having to shift around the operation values. In addition this allows passing around only one value in the block layer instead of two (and eventuall also in the file systems, but we can do that later) and thus clean up a lot of code. Last but not least this allows decreasing the size of the cmd_flags field in struct request to 32-bits. Various functions passing this value could also be updated, but I'd like to avoid the churn for now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
#ifndef BLKTRACE_H
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#define BLKTRACE_H
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#include <linux/blkdev.h>
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#include <linux/relay.h>
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#include <linux/compat.h>
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#include <uapi/linux/blktrace_api.h>
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#include <linux/list.h>
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#if defined(CONFIG_BLK_DEV_IO_TRACE)
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#include <linux/sysfs.h>
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struct blk_trace {
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int trace_state;
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struct rchan *rchan;
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unsigned long __percpu *sequence;
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unsigned char __percpu *msg_data;
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u16 act_mask;
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u64 start_lba;
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u64 end_lba;
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u32 pid;
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u32 dev;
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struct dentry *dir;
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struct dentry *dropped_file;
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struct dentry *msg_file;
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struct list_head running_list;
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atomic_t dropped;
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};
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extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
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extern void blk_trace_shutdown(struct request_queue *);
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extern int do_blk_trace_setup(struct request_queue *q, char *name,
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dev_t dev, struct block_device *bdev,
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struct blk_user_trace_setup *buts);
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extern __printf(2, 3)
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void __trace_note_message(struct blk_trace *, const char *fmt, ...);
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/**
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* blk_add_trace_msg - Add a (simple) message to the blktrace stream
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* @q: queue the io is for
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* @fmt: format to print message in
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* args... Variable argument list for format
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*
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* Description:
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* Records a (simple) message onto the blktrace stream.
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*
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* NOTE: BLK_TN_MAX_MSG characters are output at most.
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* NOTE: Can not use 'static inline' due to presence of var args...
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*
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**/
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#define blk_add_trace_msg(q, fmt, ...) \
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do { \
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struct blk_trace *bt = (q)->blk_trace; \
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if (unlikely(bt)) \
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__trace_note_message(bt, fmt, ##__VA_ARGS__); \
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} while (0)
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#define BLK_TN_MAX_MSG 128
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static inline bool blk_trace_note_message_enabled(struct request_queue *q)
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{
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struct blk_trace *bt = q->blk_trace;
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if (likely(!bt))
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return false;
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return bt->act_mask & BLK_TC_NOTIFY;
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}
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extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
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void *data, size_t len);
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extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
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struct block_device *bdev,
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char __user *arg);
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extern int blk_trace_startstop(struct request_queue *q, int start);
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extern int blk_trace_remove(struct request_queue *q);
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extern void blk_trace_remove_sysfs(struct device *dev);
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extern int blk_trace_init_sysfs(struct device *dev);
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extern struct attribute_group blk_trace_attr_group;
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#else /* !CONFIG_BLK_DEV_IO_TRACE */
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# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
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# define blk_trace_shutdown(q) do { } while (0)
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# define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY)
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# define blk_add_driver_data(q, rq, data, len) do {} while (0)
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# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
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# define blk_trace_startstop(q, start) (-ENOTTY)
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# define blk_trace_remove(q) (-ENOTTY)
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# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
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# define blk_trace_remove_sysfs(dev) do { } while (0)
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# define blk_trace_note_message_enabled(q) (false)
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static inline int blk_trace_init_sysfs(struct device *dev)
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{
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return 0;
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}
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#endif /* CONFIG_BLK_DEV_IO_TRACE */
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#ifdef CONFIG_COMPAT
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struct compat_blk_user_trace_setup {
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char name[BLKTRACE_BDEV_SIZE];
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u16 act_mask;
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u32 buf_size;
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u32 buf_nr;
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compat_u64 start_lba;
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compat_u64 end_lba;
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u32 pid;
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};
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#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
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#endif
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#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
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static inline int blk_cmd_buf_len(struct request *rq)
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{
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return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
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}
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extern void blk_dump_cmd(char *buf, struct request *rq);
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extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes);
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#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
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#endif
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