diff options
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 147 |
1 files changed, 95 insertions, 52 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 5c8018977efa..09a840264d6f 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -158,7 +158,6 @@ enum rq_flag_bits { struct request { struct list_head queuelist; struct call_single_data csd; - int cpu; struct request_queue *q; @@ -166,9 +165,11 @@ struct request { enum rq_cmd_type_bits cmd_type; unsigned long atomic_flags; + int cpu; + /* the following two fields are internal, NEVER access directly */ - sector_t __sector; /* sector cursor */ unsigned int __data_len; /* total data len */ + sector_t __sector; /* sector cursor */ struct bio *bio; struct bio *biotail; @@ -185,15 +186,19 @@ struct request { }; /* - * two pointers are available for the IO schedulers, if they need + * Three pointers are available for the IO schedulers, if they need * more they have to dynamically allocate it. */ void *elevator_private; void *elevator_private2; + void *elevator_private3; struct gendisk *rq_disk; unsigned long start_time; - +#ifdef CONFIG_BLK_CGROUP + unsigned long long start_time_ns; + unsigned long long io_start_time_ns; /* when passed to hardware */ +#endif /* Number of scatter-gather DMA addr+len pairs after * physical address coalescing is performed. */ @@ -201,20 +206,20 @@ struct request { unsigned short ioprio; + int ref_count; + void *special; /* opaque pointer available for LLD use */ char *buffer; /* kaddr of the current segment if available */ int tag; int errors; - int ref_count; - /* * when request is used as a packet command carrier */ - unsigned short cmd_len; unsigned char __cmd[BLK_MAX_CDB]; unsigned char *cmd; + unsigned short cmd_len; unsigned int extra_len; /* length of alignment and padding */ unsigned int sense_len; @@ -316,8 +321,7 @@ struct queue_limits { unsigned int discard_alignment; unsigned short logical_block_size; - unsigned short max_hw_segments; - unsigned short max_phys_segments; + unsigned short max_segments; unsigned char misaligned; unsigned char discard_misaligned; @@ -461,8 +465,8 @@ struct request_queue #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ -#define QUEUE_FLAG_CQ 16 /* hardware does queuing */ -#define QUEUE_FLAG_DISCARD 17 /* supports DISCARD */ +#define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ +#define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_CLUSTER) | \ @@ -586,9 +590,10 @@ enum { #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) -#define blk_queue_queuing(q) test_bit(QUEUE_FLAG_CQ, &(q)->queue_flags) #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) +#define blk_queue_noxmerges(q) \ + test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) #define blk_queue_flushing(q) ((q)->ordseq) @@ -916,14 +921,17 @@ extern void blk_abort_queue(struct request_queue *); */ extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id); +extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, + request_fn_proc *, + spinlock_t *, int node_id); extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); +extern struct request_queue *blk_init_allocated_queue(struct request_queue *, + request_fn_proc *, spinlock_t *); extern void blk_cleanup_queue(struct request_queue *); extern void blk_queue_make_request(struct request_queue *, make_request_fn *); extern void blk_queue_bounce_limit(struct request_queue *, u64); -extern void blk_queue_max_sectors(struct request_queue *, unsigned int); extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); -extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); -extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); +extern void blk_queue_max_segments(struct request_queue *, unsigned short); extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); extern void blk_queue_max_discard_sectors(struct request_queue *q, unsigned int max_discard_sectors); @@ -995,32 +1003,36 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, return NULL; return bqt->tag_index[tag]; } - -extern int blkdev_issue_flush(struct block_device *, sector_t *); -#define DISCARD_FL_WAIT 0x01 /* wait for completion */ -#define DISCARD_FL_BARRIER 0x02 /* issue DISCARD_BARRIER request */ -extern int blkdev_issue_discard(struct block_device *, sector_t sector, - sector_t nr_sects, gfp_t, int flags); - +enum{ + BLKDEV_WAIT, /* wait for completion */ + BLKDEV_BARRIER, /*issue request with barrier */ +}; +#define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT) +#define BLKDEV_IFL_BARRIER (1 << BLKDEV_BARRIER) +extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *, + unsigned long); +extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, + sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); +extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, + sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); static inline int sb_issue_discard(struct super_block *sb, sector_t block, sector_t nr_blocks) { block <<= (sb->s_blocksize_bits - 9); nr_blocks <<= (sb->s_blocksize_bits - 9); return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL, - DISCARD_FL_BARRIER); + BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); } extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); -#define MAX_PHYS_SEGMENTS 128 -#define MAX_HW_SEGMENTS 128 -#define SAFE_MAX_SECTORS 255 -#define BLK_DEF_MAX_SECTORS 1024 - -#define MAX_SEGMENT_SIZE 65536 - -#define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL +enum blk_default_limits { + BLK_MAX_SEGMENTS = 128, + BLK_SAFE_MAX_SECTORS = 255, + BLK_DEF_MAX_SECTORS = 1024, + BLK_MAX_SEGMENT_SIZE = 65536, + BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, +}; #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) @@ -1044,14 +1056,9 @@ static inline unsigned int queue_max_hw_sectors(struct request_queue *q) return q->limits.max_hw_sectors; } -static inline unsigned short queue_max_hw_segments(struct request_queue *q) -{ - return q->limits.max_hw_segments; -} - -static inline unsigned short queue_max_phys_segments(struct request_queue *q) +static inline unsigned short queue_max_segments(struct request_queue *q) { - return q->limits.max_phys_segments; + return q->limits.max_segments; } static inline unsigned int queue_max_segment_size(struct request_queue *q) @@ -1112,18 +1119,13 @@ static inline int queue_alignment_offset(struct request_queue *q) return q->limits.alignment_offset; } -static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t offset) +static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) { unsigned int granularity = max(lim->physical_block_size, lim->io_min); + unsigned int alignment = (sector << 9) & (granularity - 1); - offset &= granularity - 1; - return (granularity + lim->alignment_offset - offset) & (granularity - 1); -} - -static inline int queue_sector_alignment_offset(struct request_queue *q, - sector_t sector) -{ - return queue_limit_alignment_offset(&q->limits, sector << 9); + return (granularity + lim->alignment_offset - alignment) + & (granularity - 1); } static inline int bdev_alignment_offset(struct block_device *bdev) @@ -1147,10 +1149,8 @@ static inline int queue_discard_alignment(struct request_queue *q) return q->limits.discard_alignment; } -static inline int queue_sector_discard_alignment(struct request_queue *q, - sector_t sector) +static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) { - struct queue_limits *lim = &q->limits; unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); return (lim->discard_granularity + lim->discard_alignment - alignment) @@ -1210,6 +1210,48 @@ static inline void put_dev_sector(Sector p) struct work_struct; int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); +#ifdef CONFIG_BLK_CGROUP +/* + * This should not be using sched_clock(). A real patch is in progress + * to fix this up, until that is in place we need to disable preemption + * around sched_clock() in this function and set_io_start_time_ns(). + */ +static inline void set_start_time_ns(struct request *req) +{ + preempt_disable(); + req->start_time_ns = sched_clock(); + preempt_enable(); +} + +static inline void set_io_start_time_ns(struct request *req) +{ + preempt_disable(); + req->io_start_time_ns = sched_clock(); + preempt_enable(); +} + +static inline uint64_t rq_start_time_ns(struct request *req) +{ + return req->start_time_ns; +} + +static inline uint64_t rq_io_start_time_ns(struct request *req) +{ + return req->io_start_time_ns; +} +#else +static inline void set_start_time_ns(struct request *req) {} +static inline void set_io_start_time_ns(struct request *req) {} +static inline uint64_t rq_start_time_ns(struct request *req) +{ + return 0; +} +static inline uint64_t rq_io_start_time_ns(struct request *req) +{ + return 0; +} +#endif + #define MODULE_ALIAS_BLOCKDEV(major,minor) \ MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ @@ -1297,10 +1339,11 @@ struct block_device_operations { int (*direct_access) (struct block_device *, sector_t, void **, unsigned long *); int (*media_changed) (struct gendisk *); - unsigned long long (*set_capacity) (struct gendisk *, - unsigned long long); + void (*unlock_native_capacity) (struct gendisk *); int (*revalidate_disk) (struct gendisk *); int (*getgeo)(struct block_device *, struct hd_geometry *); + /* this callback is with swap_lock and sometimes page table lock held */ + void (*swap_slot_free_notify) (struct block_device *, unsigned long); struct module *owner; }; |