drivers/block/drbd/drbd_interval.h

Source file repositories/reference/linux-study-clean/drivers/block/drbd/drbd_interval.h

File Facts

System
Linux kernel
Corpus path
drivers/block/drbd/drbd_interval.h
Extension
.h
Size
1522 bytes
Lines
47
Domain
Driver Families
Bucket
drivers/block
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct drbd_interval {
	struct rb_node rb;
	sector_t sector;		/* start sector of the interval */
	sector_t end;			/* highest interval end in subtree */
	unsigned int size;		/* size in bytes */
	unsigned int local:1		/* local or remote request? */;
	unsigned int waiting:1;		/* someone is waiting for completion */
	unsigned int completed:1;	/* this has been completed already;
					 * ignore for conflict detection */

	/* to resume a partially successful drbd_al_begin_io_nonblock(); */
	unsigned int partially_in_al_next_enr;
};

static inline void drbd_clear_interval(struct drbd_interval *i)
{
	RB_CLEAR_NODE(&i->rb);
}

static inline bool drbd_interval_empty(struct drbd_interval *i)
{
	return RB_EMPTY_NODE(&i->rb);
}

extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
extern bool drbd_contains_interval(struct rb_root *, sector_t,
				   struct drbd_interval *);
extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
					unsigned int);
extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t,
					unsigned int);

#define drbd_for_each_overlap(i, root, sector, size)		\
	for (i = drbd_find_overlap(root, sector, size);		\
	     i;							\
	     i = drbd_next_overlap(i, sector, size))

#endif  /* __DRBD_INTERVAL_H */

Annotation

Implementation Notes