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Add support for multithread parity writing in sync

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This commit is contained in:
Andrea Mazzoleni 2016-01-04 11:28:34 +01:00
parent e69e8640ce
commit a3121c31c5
4 changed files with 412 additions and 64 deletions
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56
cmdline/io.h
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@ -151,6 +151,24 @@ struct snapraid_io {
*/
pthread_cond_t read_sched;
/**
* Condition for a new write is completed.
*
* The workers signal this condition when a new write is completed.
* The IO waits on this condition when it's waiting for
* a new write to be completed.
*/
pthread_cond_t write_done;
/**
* Condition for a new write scheduled.
*
* The workers wait on this condition when they are waiting for a new
* write to process.
* The IO signals this condition when new writes are scheduled.
*/
pthread_cond_t write_sched;
struct snapraid_state* state;
/**
@ -168,6 +186,7 @@ struct snapraid_io {
*/
void (*data_reader)(struct snapraid_worker*, struct snapraid_task*);
void (*parity_reader)(struct snapraid_worker*, struct snapraid_task*);
void (*parity_writer)(struct snapraid_worker*, struct snapraid_task*);
/**
* Blocks mapping.
@ -197,6 +216,8 @@ struct snapraid_io {
*/
unsigned reader_max; /**< Number of workers. */
struct snapraid_worker* reader_map; /**< Vector of workers. */
unsigned writer_max; /**< Number of workers. */
struct snapraid_worker* writer_map; /**< Vector of workers. */
/**
* List of not yet processed workers.
@ -209,6 +230,7 @@ struct snapraid_io {
* The end is when i == reader_max.
*/
unsigned char* reader_list;
unsigned char* writer_list;
/**
* Exit condition for all threads.
@ -225,6 +247,17 @@ struct snapraid_io {
* it's incremented, and a read_sched() signal is sent.
*/
unsigned reader_index;
/**
* The task currently used by the caller.
*
* It's a rolling counter, when reaching IO_MAX
* it goes again to 0.
*
* When the caller finish with the current index,
* it's incremented, and a write_sched() signal is sent.
*/
unsigned writer_index;
};
/**
@ -237,6 +270,7 @@ void io_init(struct snapraid_io* io, struct snapraid_state* state,
void (*data_reader)(struct snapraid_worker*, struct snapraid_task*),
struct snapraid_handle* handle_map, unsigned handle_max,
void (*parity_reader)(struct snapraid_worker*, struct snapraid_task*),
void (*parity_writer)(struct snapraid_worker*, struct snapraid_task*),
struct snapraid_parity_handle* parity_handle_map, unsigned parity_handle_max);
/**
@ -290,4 +324,26 @@ struct snapraid_task* io_data_read(struct snapraid_io* io, unsigned* diskcur);
*/
struct snapraid_task* io_parity_read(struct snapraid_io* io, unsigned* levcur);
/**
* Write of a parity block.
*
* It must be called exactly ::parity_handle_max times.
*
* \param io InputOutput context.
* \param pos The position of the parity block in the ::parity_handle_map vector.
*/
void io_parity_write(struct snapraid_io* io, unsigned* levcur);
/**
* Next write position.
*
* This call ends the write process.
* It must be called after io_parity_write().
*
* \param io InputOutput context.
* \param blockcur The parity position to write.
* \param skip Skip the writes, in case parity doesn't need to be updated.
*/
void io_write_next(struct snapraid_io* io, unsigned blockcur, int skip);
#endif