mirror of https://github.com/schoebel/mars
213 lines
5.9 KiB
C
213 lines
5.9 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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#ifndef MARS_H
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#define MARS_H
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#include <linux/list.h>
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#include <asm/spinlock.h>
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#include <asm/atomic.h>
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#define MARS_FATAL "MARS_FATAL " __BASE_FILE__ ": "
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#define MARS_ERROR "MARS_ERROR " __BASE_FILE__ ": "
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#define MARS_INFO "MARS_INFO " __BASE_FILE__ ": "
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#define MARS_DEBUG "MARS_DEBUG " __BASE_FILE__ ": "
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#define MARS_FAT(fmt, args...) printk(MARS_FATAL "%s(): " fmt, __FUNCTION__, ##args)
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#define MARS_ERR(fmt, args...) printk(MARS_ERROR "%s(): " fmt, __FUNCTION__, ##args)
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#define MARS_INF(fmt, args...) printk(MARS_INFO "%s(): " fmt, __FUNCTION__, ##args)
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#ifdef MARS_DEBUGGING
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#define MARS_DBG(fmt, args...) printk(MARS_DEBUG "%s(): " fmt, __FUNCTION__, ##args)
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#else
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#define MARS_DBG(args...) /**/
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#endif
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#define BRICK_OBJ_MARS_REF 0
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#define BRICK_OBJ_NR 1
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#define GFP_MARS GFP_NOIO
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#include "brick.h"
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/////////////////////////////////////////////////////////////////////////
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// MARS-specific definitions
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// object stuff
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/* mars_ref */
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#define MARS_REF_UPTODATE 1
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#define MARS_REF_READING 2
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#define MARS_REF_WRITING 4
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extern const struct generic_object_type mars_ref_type;
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struct mars_ref_aspect {
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GENERIC_ASPECT(mars_ref);
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};
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struct mars_ref_aspect_layout {
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GENERIC_ASPECT_LAYOUT(mars_ref);
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};
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struct mars_ref_object_layout {
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GENERIC_OBJECT_LAYOUT(mars_ref);
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};
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#define MARS_REF_OBJECT(PREFIX) \
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GENERIC_OBJECT(PREFIX); \
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/* supplied by caller */ \
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loff_t ref_pos; \
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int ref_len; \
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int ref_may_write; \
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/* maintained by the ref implementation, readable for callers */ \
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struct bio *orig_bio; \
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void *ref_data; \
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int ref_flags; \
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int ref_rw; \
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/* maintained by the ref implementation, incrementable for \
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* callers (but not decrementable! use ref_put()) */ \
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atomic_t ref_count; \
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/* callback part */ \
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int cb_error; \
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void *cb_private; \
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void (*cb_ref_endio)(struct mars_ref_object *mref); \
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struct mars_ref_object {
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MARS_REF_OBJECT(mars_ref);
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};
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// internal helper structs
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struct mars_info {
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loff_t current_size;
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struct file *backing_file;
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};
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// brick stuff
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#define MARS_BRICK(PREFIX) \
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GENERIC_BRICK(PREFIX); \
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struct mars_brick {
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MARS_BRICK(mars);
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};
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#define MARS_INPUT(PREFIX) \
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GENERIC_INPUT(PREFIX); \
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struct mars_input {
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MARS_INPUT(mars);
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};
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#define MARS_OUTPUT(PREFIX) \
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GENERIC_OUTPUT(PREFIX); \
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struct mars_output {
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MARS_OUTPUT(mars);
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};
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#define MARS_BRICK_OPS(PREFIX) \
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GENERIC_BRICK_OPS(PREFIX); \
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int (*mars_dummy_op)(int); \
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#define MARS_OUTPUT_OPS(PREFIX) \
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GENERIC_OUTPUT_OPS(PREFIX); \
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int (*mars_get_info)(struct PREFIX##_output *output, struct mars_info *info); \
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/* mars_ref */ \
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int (*mars_ref_get)(struct PREFIX##_output *output, struct mars_ref_object *mref); \
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void (*mars_ref_io)(struct PREFIX##_output *output, struct mars_ref_object *mref, int rw); \
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void (*mars_ref_put)(struct PREFIX##_output *output, struct mars_ref_object *mref); \
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// all non-extendable types
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#define _MARS_TYPES(BRICK) \
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\
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struct BRICK##_brick_ops { \
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MARS_BRICK_OPS(BRICK); \
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}; \
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\
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struct BRICK##_output_ops { \
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MARS_OUTPUT_OPS(BRICK); \
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}; \
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\
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struct BRICK##_brick_type { \
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GENERIC_BRICK_TYPE(BRICK); \
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}; \
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\
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struct BRICK##_input_type { \
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GENERIC_INPUT_TYPE(BRICK); \
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}; \
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\
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struct BRICK##_output_type { \
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GENERIC_OUTPUT_TYPE(BRICK); \
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}; \
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\
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GENERIC_MAKE_FUNCTIONS(BRICK); \
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GENERIC_MAKE_CONNECT(BRICK,BRICK); \
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#define MARS_TYPES(BRICK) \
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\
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_MARS_TYPES(BRICK) \
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\
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struct BRICK##_object_layout; \
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\
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GENERIC_MAKE_CONNECT(generic,BRICK); \
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GENERIC_OBJECT_LAYOUT_FUNCTIONS(BRICK); \
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GENERIC_ASPECT_LAYOUT_FUNCTIONS(BRICK,mars_ref); \
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GENERIC_ASPECT_FUNCTIONS(BRICK,mars_ref); \
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// instantiate all mars-specific functions
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GENERIC_OBJECT_FUNCTIONS(mars_ref);
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/////////////////////////////////////////////////////////////////////////
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// MARS-specific helper functions
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#define MARS_MAKE_STATICS(BRICK) \
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\
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int BRICK##_brick_nr = -EEXIST; \
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EXPORT_SYMBOL_GPL(BRICK##_brick_nr); \
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\
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static const struct generic_aspect_type BRICK##_mars_ref_aspect_type = { \
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.aspect_type_name = #BRICK "_mars_ref_aspect_type", \
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.object_type = &mars_ref_type, \
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.aspect_size = sizeof(struct BRICK##_mars_ref_aspect), \
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.init_fn = BRICK##_mars_ref_aspect_init_fn, \
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}; \
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\
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static const struct generic_aspect_type *BRICK##_aspect_types[BRICK_OBJ_NR] = { \
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[BRICK_OBJ_MARS_REF] = &BRICK##_mars_ref_aspect_type, \
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}; \
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#define _CHECK_SPIN(spinlock,OP,minval) \
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do { \
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int test = atomic_read(spinlock); \
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if (test OP (minval)) { \
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atomic_set(spinlock, minval); \
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MARS_ERR("line %d spinlock " #spinlock " " #OP " " #minval "\n", __LINE__); \
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} \
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} while (0)
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#define CHECK_SPIN(spinlock,minval) \
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_CHECK_SPIN(spinlock, <, minval)
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static inline void mars_ref_attach_bio(struct mars_ref_object *mref, struct bio *bio)
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{
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int test;
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if (unlikely(mref->orig_bio)) {
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MARS_ERR("attaching a bio twice!\n");
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}
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test = atomic_read(&mref->ref_count);
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if (unlikely(test != 0)) {
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MARS_ERR("bad ref_count %d\n", test);
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}
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mref->orig_bio = bio;
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mref->ref_pos = -1;
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atomic_set(&mref->ref_count, 1);
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}
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#endif
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