dm snapshot: remove dm_snap header use

Move useful functions out of dm-snap.h and stop using dm-snap.h.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

5 files changed, 54 insertions, 57 deletions

diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 4dbf3577408e..835f402d9470 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -97,8 +97,6 @@ struct dm_exception_store {
         struct dm_exception_store_type *type;
         struct dm_target *ti;
 
-        struct dm_snapshot *snap;
-
         struct dm_dev *cow;
 
         /* Size of data blocks saved - must be a power of 2 */
@@ -152,6 +150,20 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_snap_exception *e)
 
 #  endif
 
+/*
+ * Return the number of sectors in the device.
+ */
+static inline sector_t get_dev_size(struct block_device *bdev)
+{
+        return bdev->bd_inode->i_size >> SECTOR_SHIFT;
+}
+
+static inline chunk_t sector_to_chunk(struct dm_exception_store *store,
+                                      sector_t sector)
+{
+        return (sector & ~store->chunk_mask) >> store->chunk_shift;
+}
+
 int dm_exception_store_type_register(struct dm_exception_store_type *type);
 int dm_exception_store_type_unregister(struct dm_exception_store_type *type);
 
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 505afac9976f..3907c4ce2ae5 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -6,7 +6,6 @@
  */
 
 #include "dm-exception-store.h"
-#include "dm-snap.h"
 
 #include <linux/mm.h>
 #include <linux/pagemap.h>
@@ -89,7 +88,7 @@ struct commit_callback {
  * The top level structure for a persistent exception store.
  */
 struct pstore {
-        struct dm_snapshot *snap;       /* up pointer to my snapshot */
+        struct dm_exception_store *store;
         int version;
         int valid;
         uint32_t exceptions_per_area;
@@ -141,7 +140,7 @@ static int alloc_area(struct pstore *ps)
         int r = -ENOMEM;
         size_t len;
 
-        len = ps->snap->store->chunk_size << SECTOR_SHIFT;
+        len = ps->store->chunk_size << SECTOR_SHIFT;
 
         /*
          * Allocate the chunk_size block of memory that will hold
@@ -189,9 +188,9 @@ static void do_metadata(struct work_struct *work)
 static int chunk_io(struct pstore *ps, chunk_t chunk, int rw, int metadata)
 {
         struct dm_io_region where = {
-                .bdev = ps->snap->store->cow->bdev,
-                .sector = ps->snap->store->chunk_size * chunk,
-                .count = ps->snap->store->chunk_size,
+                .bdev = ps->store->cow->bdev,
+                .sector = ps->store->chunk_size * chunk,
+                .count = ps->store->chunk_size,
         };
         struct dm_io_request io_req = {
                 .bi_rw = rw,
@@ -247,15 +246,15 @@ static int area_io(struct pstore *ps, int rw)
 
 static void zero_memory_area(struct pstore *ps)
 {
-        memset(ps->area, 0, ps->snap->store->chunk_size << SECTOR_SHIFT);
+        memset(ps->area, 0, ps->store->chunk_size << SECTOR_SHIFT);
 }
 
 static int zero_disk_area(struct pstore *ps, chunk_t area)
 {
         struct dm_io_region where = {
-                .bdev = ps->snap->store->cow->bdev,
-                .sector = ps->snap->store->chunk_size * area_location(ps, area),
-                .count = ps->snap->store->chunk_size,
+                .bdev = ps->store->cow->bdev,
+                .sector = ps->store->chunk_size * area_location(ps, area),
+                .count = ps->store->chunk_size,
         };
         struct dm_io_request io_req = {
                 .bi_rw = WRITE,
@@ -278,17 +277,16 @@ static int read_header(struct pstore *ps, int *new_snapshot)
         /*
          * Use default chunk size (or hardsect_size, if larger) if none supplied
          */
-        if (!ps->snap->store->chunk_size) {
-                ps->snap->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
-                    bdev_hardsect_size(ps->snap->store->cow->bdev) >> 9);
-                ps->snap->store->chunk_mask = ps->snap->store->chunk_size - 1;
-                ps->snap->store->chunk_shift = ffs(ps->snap->store->chunk_size)
-                                               - 1;
+        if (!ps->store->chunk_size) {
+                ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
+                    bdev_hardsect_size(ps->store->cow->bdev) >> 9);
+                ps->store->chunk_mask = ps->store->chunk_size - 1;
+                ps->store->chunk_shift = ffs(ps->store->chunk_size) - 1;
                 chunk_size_supplied = 0;
         }
 
-        ps->io_client = dm_io_client_create(sectors_to_pages(ps->snap->
-                                                            store->chunk_size));
+        ps->io_client = dm_io_client_create(sectors_to_pages(ps->store->
+                                                             chunk_size));
         if (IS_ERR(ps->io_client))
                 return PTR_ERR(ps->io_client);
 
@@ -318,22 +316,22 @@ static int read_header(struct pstore *ps, int *new_snapshot)
         ps->version = le32_to_cpu(dh->version);
         chunk_size = le32_to_cpu(dh->chunk_size);
 
-        if (!chunk_size_supplied || ps->snap->store->chunk_size == chunk_size)
+        if (!chunk_size_supplied || ps->store->chunk_size == chunk_size)
                 return 0;
 
         DMWARN("chunk size %llu in device metadata overrides "
                "table chunk size of %llu.",
                (unsigned long long)chunk_size,
-               (unsigned long long)ps->snap->store->chunk_size);
+               (unsigned long long)ps->store->chunk_size);
 
         /* We had a bogus chunk_size. Fix stuff up. */
         free_area(ps);
 
-        ps->snap->store->chunk_size = chunk_size;
-        ps->snap->store->chunk_mask = chunk_size - 1;
-        ps->snap->store->chunk_shift = ffs(chunk_size) - 1;
+        ps->store->chunk_size = chunk_size;
+        ps->store->chunk_mask = chunk_size - 1;
+        ps->store->chunk_shift = ffs(chunk_size) - 1;
 
-        r = dm_io_client_resize(sectors_to_pages(ps->snap->store->chunk_size),
+        r = dm_io_client_resize(sectors_to_pages(ps->store->chunk_size),
                                 ps->io_client);
         if (r)
                 return r;
@@ -350,13 +348,13 @@ static int write_header(struct pstore *ps)
 {
         struct disk_header *dh;
 
-        memset(ps->area, 0, ps->snap->store->chunk_size << SECTOR_SHIFT);
+        memset(ps->area, 0, ps->store->chunk_size << SECTOR_SHIFT);
 
         dh = (struct disk_header *) ps->area;
         dh->magic = cpu_to_le32(SNAP_MAGIC);
         dh->valid = cpu_to_le32(ps->valid);
         dh->version = cpu_to_le32(ps->version);
-        dh->chunk_size = cpu_to_le32(ps->snap->store->chunk_size);
+        dh->chunk_size = cpu_to_le32(ps->store->chunk_size);
 
         return chunk_io(ps, 0, WRITE, 1);
 }
@@ -508,8 +506,8 @@ static int persistent_read_metadata(struct dm_exception_store *store,
         /*
          * Now we know correct chunk_size, complete the initialisation.
          */
-        ps->exceptions_per_area = (ps->snap->store->chunk_size << SECTOR_SHIFT)
-                                  / sizeof(struct disk_exception);
+        ps->exceptions_per_area = (ps->store->chunk_size << SECTOR_SHIFT) /
+                                  sizeof(struct disk_exception);
         ps->callbacks = dm_vcalloc(ps->exceptions_per_area,
                         sizeof(*ps->callbacks));
         if (!ps->callbacks)
@@ -667,7 +665,7 @@ static int persistent_ctr(struct dm_exception_store *store,
         if (!ps)
                 return -ENOMEM;
 
-        ps->snap = store->snap;
+        ps->store = store;
         ps->valid = 1;
         ps->version = SNAPSHOT_DISK_VERSION;
         ps->area = NULL;
diff --git a/drivers/md/dm-snap-transient.c b/drivers/md/dm-snap-transient.c
index 77f58be080c4..a883d6e658be 100644
--- a/drivers/md/dm-snap-transient.c
+++ b/drivers/md/dm-snap-transient.c
@@ -6,7 +6,6 @@
  */
 
 #include "dm-exception-store.h"
-#include "dm-snap.h"
 
 #include <linux/mm.h>
 #include <linux/pagemap.h>
@@ -45,7 +44,7 @@ static int transient_prepare_exception(struct dm_exception_store *store,
         if (size < (tc->next_free + store->chunk_size))
                 return -1;
 
-        e->new_chunk = sector_to_chunk(store->snap, tc->next_free);
+        e->new_chunk = sector_to_chunk(store, tc->next_free);
         tc->next_free += store->chunk_size;
 
         return 0;
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 5c067efc665f..467c586e2439 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -637,8 +637,6 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                 goto bad4;
         }
 
-        s->store->snap = s;
-
         r = dm_kcopyd_client_create(SNAPSHOT_PAGES, &s->kcopyd_client);
         if (r) {
                 ti->error = "Could not create kcopyd client";
@@ -962,11 +960,11 @@ static void start_copy(struct dm_snap_pending_exception *pe)
         dev_size = get_dev_size(bdev);
 
         src.bdev = bdev;
-        src.sector = chunk_to_sector(s, pe->e.old_chunk);
+        src.sector = chunk_to_sector(s->store, pe->e.old_chunk);
         src.count = min(s->store->chunk_size, dev_size - src.sector);
 
         dest.bdev = s->store->cow->bdev;
-        dest.sector = chunk_to_sector(s, pe->e.new_chunk);
+        dest.sector = chunk_to_sector(s->store, pe->e.new_chunk);
         dest.count = src.count;
 
         /* Hand over to kcopyd */
@@ -1027,9 +1025,11 @@ static void remap_exception(struct dm_snapshot *s, struct dm_snap_exception *e,
                             struct bio *bio, chunk_t chunk)
 {
         bio->bi_bdev = s->store->cow->bdev;
-        bio->bi_sector = chunk_to_sector(s, dm_chunk_number(e->new_chunk) +
-                         (chunk - e->old_chunk)) +
-                         (bio->bi_sector & s->store->chunk_mask);
+        bio->bi_sector = chunk_to_sector(s->store,
+                                         dm_chunk_number(e->new_chunk) +
+                                         (chunk - e->old_chunk)) +
+                                         (bio->bi_sector &
+                                          s->store->chunk_mask);
 }
 
 static int snapshot_map(struct dm_target *ti, struct bio *bio,
@@ -1041,7 +1041,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
         chunk_t chunk;
         struct dm_snap_pending_exception *pe = NULL;
 
-        chunk = sector_to_chunk(s, bio->bi_sector);
+        chunk = sector_to_chunk(s->store, bio->bi_sector);
 
         /* Full snapshots are not usable */
         /* To get here the table must be live so s->active is always set. */
@@ -1210,7 +1210,7 @@ static int __origin_write(struct list_head *snapshots, struct bio *bio)
                  * Remember, different snapshots can have
                  * different chunk sizes.
                  */
-                chunk = sector_to_chunk(snap, bio->bi_sector);
+                chunk = sector_to_chunk(snap->store, bio->bi_sector);
 
                 /*
                  * Check exception table to see if block
diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h
index c8a486e0ea2c..4f61bc4c14f6 100644
--- a/drivers/md/dm-snap.h
+++ b/drivers/md/dm-snap.h
@@ -68,22 +68,10 @@ struct dm_snapshot {
         struct hlist_head tracked_chunk_hash[DM_TRACKED_CHUNK_HASH_SIZE];
 };
 
-/*
- * Return the number of sectors in the device.
- */
-static inline sector_t get_dev_size(struct block_device *bdev)
-{
-        return bdev->bd_inode->i_size >> SECTOR_SHIFT;
-}
-
-static inline chunk_t sector_to_chunk(struct dm_snapshot *s, sector_t sector)
-{
-        return (sector & ~s->store->chunk_mask) >> s->store->chunk_shift;
-}
-
-static inline sector_t chunk_to_sector(struct dm_snapshot *s, chunk_t chunk)
+static inline sector_t chunk_to_sector(struct dm_exception_store *store,
+                                      chunk_t chunk)
 {
-        return chunk << s->store->chunk_shift;
+        return chunk << store->chunk_shift;
 }
 
 static inline int bdev_equal(struct block_device *lhs, struct block_device *rhs)