[PATCH v3 1/9] raid5-cache: move declarations to separate header

[Artur Paszkiewicz <artur.paszkiewicz@intel.com>]

Next patches will be reusing raid5-cache structures and functions, so
put them in their own header.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
---
 drivers/md/raid5-cache.c | 133 +------------------------------------
 drivers/md/raid5-cache.h | 166 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/md/raid5.c       |   1 +
 drivers/md/raid5.h       |  30 ---------
 4 files changed, 168 insertions(+), 162 deletions(-)
 create mode 100644 drivers/md/raid5-cache.h

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 76c0e5063f1b..394d87b62efa 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -24,6 +24,7 @@
 #include "md.h"
 #include "raid5.h"
 #include "bitmap.h"
+#include "raid5-cache.h"
 
 /*
  * metadata/data stored in disk with 4k size unit (a block) regardless
@@ -53,16 +54,6 @@
  */
 #define R5L_POOL_SIZE	4
 
-/*
- * r5c journal modes of the array: write-back or write-through.
- * write-through mode has identical behavior as existing log only
- * implementation.
- */
-enum r5c_journal_mode {
-	R5C_JOURNAL_MODE_WRITE_THROUGH = 0,
-	R5C_JOURNAL_MODE_WRITE_BACK = 1,
-};
-
 static char *r5c_journal_mode_str[] = {"write-through",
 				       "write-back"};
 /*
@@ -96,81 +87,6 @@ static char *r5c_journal_mode_str[] = {"write-through",
  *	- return IO for pending writes
  */
 
-struct r5l_log {
-	struct md_rdev *rdev;
-
-	u32 uuid_checksum;
-
-	sector_t device_size;		/* log device size, round to
-					 * BLOCK_SECTORS */
-	sector_t max_free_space;	/* reclaim run if free space is at
-					 * this size */
-
-	sector_t last_checkpoint;	/* log tail. where recovery scan
-					 * starts from */
-	u64 last_cp_seq;		/* log tail sequence */
-
-	sector_t log_start;		/* log head. where new data appends */
-	u64 seq;			/* log head sequence */
-
-	sector_t next_checkpoint;
-
-	struct mutex io_mutex;
-	struct r5l_io_unit *current_io;	/* current io_unit accepting new data */
-
-	spinlock_t io_list_lock;
-	struct list_head running_ios;	/* io_units which are still running,
-					 * and have not yet been completely
-					 * written to the log */
-	struct list_head io_end_ios;	/* io_units which have been completely
-					 * written to the log but not yet written
-					 * to the RAID */
-	struct list_head flushing_ios;	/* io_units which are waiting for log
-					 * cache flush */
-	struct list_head finished_ios;	/* io_units which settle down in log disk */
-	struct bio flush_bio;
-
-	struct list_head no_mem_stripes;   /* pending stripes, -ENOMEM */
-
-	struct kmem_cache *io_kc;
-	mempool_t *io_pool;
-	struct bio_set *bs;
-	mempool_t *meta_pool;
-
-	struct md_thread *reclaim_thread;
-	unsigned long reclaim_target;	/* number of space that need to be
-					 * reclaimed.  if it's 0, reclaim spaces
-					 * used by io_units which are in
-					 * IO_UNIT_STRIPE_END state (eg, reclaim
-					 * dones't wait for specific io_unit
-					 * switching to IO_UNIT_STRIPE_END
-					 * state) */
-	wait_queue_head_t iounit_wait;
-
-	struct list_head no_space_stripes; /* pending stripes, log has no space */
-	spinlock_t no_space_stripes_lock;
-
-	bool need_cache_flush;
-
-	/* for r5c_cache */
-	enum r5c_journal_mode r5c_journal_mode;
-
-	/* all stripes in r5cache, in the order of seq at sh->log_start */
-	struct list_head stripe_in_journal_list;
-
-	spinlock_t stripe_in_journal_lock;
-	atomic_t stripe_in_journal_count;
-
-	/* to submit async io_units, to fulfill ordering of flush */
-	struct work_struct deferred_io_work;
-	/* to disable write back during in degraded mode */
-	struct work_struct disable_writeback_work;
-
-	/* to for chunk_aligned_read in writeback mode, details below */
-	spinlock_t tree_lock;
-	struct radix_tree_root big_stripe_tree;
-};
-
 /*
  * Enable chunk_aligned_read() with write back cache.
  *
@@ -218,53 +134,6 @@ static inline sector_t r5c_tree_index(struct r5conf *conf,
 	return sect;
 }
 
-/*
- * an IO range starts from a meta data block and end at the next meta data
- * block. The io unit's the meta data block tracks data/parity followed it. io
- * unit is written to log disk with normal write, as we always flush log disk
- * first and then start move data to raid disks, there is no requirement to
- * write io unit with FLUSH/FUA
- */
-struct r5l_io_unit {
-	struct r5l_log *log;
-
-	struct page *meta_page;	/* store meta block */
-	int meta_offset;	/* current offset in meta_page */
-
-	struct bio *current_bio;/* current_bio accepting new data */
-
-	atomic_t pending_stripe;/* how many stripes not flushed to raid */
-	u64 seq;		/* seq number of the metablock */
-	sector_t log_start;	/* where the io_unit starts */
-	sector_t log_end;	/* where the io_unit ends */
-	struct list_head log_sibling; /* log->running_ios */
-	struct list_head stripe_list; /* stripes added to the io_unit */
-
-	int state;
-	bool need_split_bio;
-	struct bio *split_bio;
-
-	unsigned int has_flush:1;      /* include flush request */
-	unsigned int has_fua:1;        /* include fua request */
-	unsigned int has_null_flush:1; /* include empty flush request */
-	/*
-	 * io isn't sent yet, flush/fua request can only be submitted till it's
-	 * the first IO in running_ios list
-	 */
-	unsigned int io_deferred:1;
-
-	struct bio_list flush_barriers;   /* size == 0 flush bios */
-};
-
-/* r5l_io_unit state */
-enum r5l_io_unit_state {
-	IO_UNIT_RUNNING = 0,	/* accepting new IO */
-	IO_UNIT_IO_START = 1,	/* io_unit bio start writing to log,
-				 * don't accepting new bio */
-	IO_UNIT_IO_END = 2,	/* io_unit bio finish writing to log */
-	IO_UNIT_STRIPE_END = 3,	/* stripes data finished writing to raid */
-};
-
 bool r5c_is_writeback(struct r5l_log *log)
 {
 	return (log != NULL &&
diff --git a/drivers/md/raid5-cache.h b/drivers/md/raid5-cache.h
new file mode 100644
index 000000000000..96dc95d4a36c
--- /dev/null
+++ b/drivers/md/raid5-cache.h
@@ -0,0 +1,166 @@
+#ifndef _RAID5_CACHE_H
+#define _RAID5_CACHE_H
+
+/*
+ * r5c journal modes of the array: write-back or write-through.
+ * write-through mode has identical behavior as existing log only
+ * implementation.
+ */
+enum r5c_journal_mode {
+	R5C_JOURNAL_MODE_WRITE_THROUGH = 0,
+	R5C_JOURNAL_MODE_WRITE_BACK = 1,
+};
+
+struct r5l_log {
+	struct md_rdev *rdev;
+
+	u32 uuid_checksum;
+
+	sector_t device_size;		/* log device size, round to
+					 * BLOCK_SECTORS */
+	sector_t max_free_space;	/* reclaim run if free space is at
+					 * this size */
+
+	sector_t last_checkpoint;	/* log tail. where recovery scan
+					 * starts from */
+	u64 last_cp_seq;		/* log tail sequence */
+
+	sector_t log_start;		/* log head. where new data appends */
+	u64 seq;			/* log head sequence */
+
+	sector_t next_checkpoint;
+
+	struct mutex io_mutex;
+	struct r5l_io_unit *current_io;	/* current io_unit accepting new data */
+
+	spinlock_t io_list_lock;
+	struct list_head running_ios;	/* io_units which are still running,
+					 * and have not yet been completely
+					 * written to the log */
+	struct list_head io_end_ios;	/* io_units which have been completely
+					 * written to the log but not yet written
+					 * to the RAID */
+	struct list_head flushing_ios;	/* io_units which are waiting for log
+					 * cache flush */
+	struct list_head finished_ios;	/* io_units which settle down in log disk */
+	struct bio flush_bio;
+
+	struct list_head no_mem_stripes;   /* pending stripes, -ENOMEM */
+
+	struct kmem_cache *io_kc;
+	mempool_t *io_pool;
+	struct bio_set *bs;
+	mempool_t *meta_pool;
+
+	struct md_thread *reclaim_thread;
+	unsigned long reclaim_target;	/* number of space that need to be
+					 * reclaimed.  if it's 0, reclaim spaces
+					 * used by io_units which are in
+					 * IO_UNIT_STRIPE_END state (eg, reclaim
+					 * dones't wait for specific io_unit
+					 * switching to IO_UNIT_STRIPE_END
+					 * state) */
+	wait_queue_head_t iounit_wait;
+
+	struct list_head no_space_stripes; /* pending stripes, log has no space */
+	spinlock_t no_space_stripes_lock;
+
+	bool need_cache_flush;
+
+	/* for r5c_cache */
+	enum r5c_journal_mode r5c_journal_mode;
+
+	/* all stripes in r5cache, in the order of seq at sh->log_start */
+	struct list_head stripe_in_journal_list;
+
+	spinlock_t stripe_in_journal_lock;
+	atomic_t stripe_in_journal_count;
+
+	/* to submit async io_units, to fulfill ordering of flush */
+	struct work_struct deferred_io_work;
+	/* to disable write back during in degraded mode */
+	struct work_struct disable_writeback_work;
+
+	/* to for chunk_aligned_read in writeback mode, details below */
+	spinlock_t tree_lock;
+	struct radix_tree_root big_stripe_tree;
+};
+
+/*
+ * an IO range starts from a meta data block and end at the next meta data
+ * block. The io unit's the meta data block tracks data/parity followed it. io
+ * unit is written to log disk with normal write, as we always flush log disk
+ * first and then start move data to raid disks, there is no requirement to
+ * write io unit with FLUSH/FUA
+ */
+struct r5l_io_unit {
+	struct r5l_log *log;
+
+	struct page *meta_page;	/* store meta block */
+	int meta_offset;	/* current offset in meta_page */
+
+	struct bio *current_bio;/* current_bio accepting new data */
+
+	atomic_t pending_stripe;/* how many stripes not flushed to raid */
+	u64 seq;		/* seq number of the metablock */
+	sector_t log_start;	/* where the io_unit starts */
+	sector_t log_end;	/* where the io_unit ends */
+	struct list_head log_sibling; /* log->running_ios */
+	struct list_head stripe_list; /* stripes added to the io_unit */
+
+	int state;
+	bool need_split_bio;
+	struct bio *split_bio;
+
+	unsigned int has_flush:1;      /* include flush request */
+	unsigned int has_fua:1;        /* include fua request */
+	unsigned int has_null_flush:1; /* include empty flush request */
+	/*
+	 * io isn't sent yet, flush/fua request can only be submitted till it's
+	 * the first IO in running_ios list
+	 */
+	unsigned int io_deferred:1;
+
+	struct bio_list flush_barriers;   /* size == 0 flush bios */
+};
+
+/* r5l_io_unit state */
+enum r5l_io_unit_state {
+	IO_UNIT_RUNNING = 0,	/* accepting new IO */
+	IO_UNIT_IO_START = 1,	/* io_unit bio start writing to log,
+				 * don't accepting new bio */
+	IO_UNIT_IO_END = 2,	/* io_unit bio finish writing to log */
+	IO_UNIT_STRIPE_END = 3,	/* stripes data finished writing to raid */
+};
+
+extern int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev);
+extern void r5l_exit_log(struct r5l_log *log);
+extern int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh);
+extern void r5l_write_stripe_run(struct r5l_log *log);
+extern void r5l_flush_stripe_to_raid(struct r5l_log *log);
+extern void r5l_stripe_write_finished(struct stripe_head *sh);
+extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
+extern void r5l_quiesce(struct r5l_log *log, int state);
+extern bool r5l_log_disk_error(struct r5conf *conf);
+extern bool r5c_is_writeback(struct r5l_log *log);
+extern int
+r5c_try_caching_write(struct r5conf *conf, struct stripe_head *sh,
+		      struct stripe_head_state *s, int disks);
+extern void
+r5c_finish_stripe_write_out(struct r5conf *conf, struct stripe_head *sh,
+			    struct stripe_head_state *s);
+extern void r5c_release_extra_page(struct stripe_head *sh);
+extern void r5c_use_extra_page(struct stripe_head *sh);
+extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
+extern void r5c_handle_cached_data_endio(struct r5conf *conf,
+	struct stripe_head *sh, int disks, struct bio_list *return_bi);
+extern int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh,
+			  struct stripe_head_state *s);
+extern void r5c_make_stripe_write_out(struct stripe_head *sh);
+extern void r5c_flush_cache(struct r5conf *conf, int num);
+extern void r5c_check_stripe_cache_usage(struct r5conf *conf);
+extern void r5c_check_cached_full_stripe(struct r5conf *conf);
+extern struct md_sysfs_entry r5c_journal_mode;
+extern void r5c_update_on_rdev_error(struct mddev *mddev);
+extern bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect);
+#endif /* _RAID5_CACHE_H */
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b62f671a93ab..d1cba941951e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -61,6 +61,7 @@
 #include "raid5.h"
 #include "raid0.h"
 #include "bitmap.h"
+#include "raid5-cache.h"
 
 #define UNSUPPORTED_MDDEV_FLAGS	(1L << MD_FAILFAST_SUPPORTED)
 
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index c0687df5ba06..0f64a58873de 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -763,34 +763,4 @@ extern struct stripe_head *
 raid5_get_active_stripe(struct r5conf *conf, sector_t sector,
 			int previous, int noblock, int noquiesce);
 extern int raid5_calc_degraded(struct r5conf *conf);
-extern int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev);
-extern void r5l_exit_log(struct r5l_log *log);
-extern int r5l_write_stripe(struct r5l_log *log, struct stripe_head *head_sh);
-extern void r5l_write_stripe_run(struct r5l_log *log);
-extern void r5l_flush_stripe_to_raid(struct r5l_log *log);
-extern void r5l_stripe_write_finished(struct stripe_head *sh);
-extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
-extern void r5l_quiesce(struct r5l_log *log, int state);
-extern bool r5l_log_disk_error(struct r5conf *conf);
-extern bool r5c_is_writeback(struct r5l_log *log);
-extern int
-r5c_try_caching_write(struct r5conf *conf, struct stripe_head *sh,
-		      struct stripe_head_state *s, int disks);
-extern void
-r5c_finish_stripe_write_out(struct r5conf *conf, struct stripe_head *sh,
-			    struct stripe_head_state *s);
-extern void r5c_release_extra_page(struct stripe_head *sh);
-extern void r5c_use_extra_page(struct stripe_head *sh);
-extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
-extern void r5c_handle_cached_data_endio(struct r5conf *conf,
-	struct stripe_head *sh, int disks, struct bio_list *return_bi);
-extern int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh,
-			  struct stripe_head_state *s);
-extern void r5c_make_stripe_write_out(struct stripe_head *sh);
-extern void r5c_flush_cache(struct r5conf *conf, int num);
-extern void r5c_check_stripe_cache_usage(struct r5conf *conf);
-extern void r5c_check_cached_full_stripe(struct r5conf *conf);
-extern struct md_sysfs_entry r5c_journal_mode;
-extern void r5c_update_on_rdev_error(struct mddev *mddev);
-extern bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect);
 #endif
-- 
2.11.0