dm: use kmem_cache macro
Use new KMEM_CACHE() macro and make the newly-exposed structure names more
meaningful. Also remove some superfluous casts and inlines (let a modern
compiler be the judge).
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 0821a2b..1da4122 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -42,8 +42,8 @@
static struct workqueue_struct *ksnapd;
static void flush_queued_bios(struct work_struct *work);
-struct pending_exception {
- struct exception e;
+struct dm_snap_pending_exception {
+ struct dm_snap_exception e;
/*
* Origin buffers waiting for this to complete are held
@@ -63,7 +63,7 @@
* group of pending_exceptions. It is always last to get freed.
* These fields get set up when writing to the origin.
*/
- struct pending_exception *primary_pe;
+ struct dm_snap_pending_exception *primary_pe;
/*
* Number of pending_exceptions processing this chunk.
@@ -137,7 +137,7 @@
kfree(_origins);
}
-static inline unsigned int origin_hash(struct block_device *bdev)
+static unsigned origin_hash(struct block_device *bdev)
{
return bdev->bd_dev & ORIGIN_MASK;
}
@@ -231,7 +231,7 @@
static void exit_exception_table(struct exception_table *et, struct kmem_cache *mem)
{
struct list_head *slot;
- struct exception *ex, *next;
+ struct dm_snap_exception *ex, *next;
int i, size;
size = et->hash_mask + 1;
@@ -245,18 +245,19 @@
vfree(et->table);
}
-static inline uint32_t exception_hash(struct exception_table *et, chunk_t chunk)
+static uint32_t exception_hash(struct exception_table *et, chunk_t chunk)
{
return chunk & et->hash_mask;
}
-static void insert_exception(struct exception_table *eh, struct exception *e)
+static void insert_exception(struct exception_table *eh,
+ struct dm_snap_exception *e)
{
struct list_head *l = &eh->table[exception_hash(eh, e->old_chunk)];
list_add(&e->hash_list, l);
}
-static inline void remove_exception(struct exception *e)
+static void remove_exception(struct dm_snap_exception *e)
{
list_del(&e->hash_list);
}
@@ -265,11 +266,11 @@
* Return the exception data for a sector, or NULL if not
* remapped.
*/
-static struct exception *lookup_exception(struct exception_table *et,
- chunk_t chunk)
+static struct dm_snap_exception *lookup_exception(struct exception_table *et,
+ chunk_t chunk)
{
struct list_head *slot;
- struct exception *e;
+ struct dm_snap_exception *e;
slot = &et->table[exception_hash(et, chunk)];
list_for_each_entry (e, slot, hash_list)
@@ -279,9 +280,9 @@
return NULL;
}
-static inline struct exception *alloc_exception(void)
+static struct dm_snap_exception *alloc_exception(void)
{
- struct exception *e;
+ struct dm_snap_exception *e;
e = kmem_cache_alloc(exception_cache, GFP_NOIO);
if (!e)
@@ -290,24 +291,24 @@
return e;
}
-static inline void free_exception(struct exception *e)
+static void free_exception(struct dm_snap_exception *e)
{
kmem_cache_free(exception_cache, e);
}
-static inline struct pending_exception *alloc_pending_exception(void)
+static struct dm_snap_pending_exception *alloc_pending_exception(void)
{
return mempool_alloc(pending_pool, GFP_NOIO);
}
-static inline void free_pending_exception(struct pending_exception *pe)
+static void free_pending_exception(struct dm_snap_pending_exception *pe)
{
mempool_free(pe, pending_pool);
}
int dm_add_exception(struct dm_snapshot *s, chunk_t old, chunk_t new)
{
- struct exception *e;
+ struct dm_snap_exception *e;
e = alloc_exception();
if (!e)
@@ -334,7 +335,7 @@
/*
* Rounds a number down to a power of 2.
*/
-static inline uint32_t round_down(uint32_t n)
+static uint32_t round_down(uint32_t n)
{
while (n & (n - 1))
n &= (n - 1);
@@ -384,7 +385,7 @@
* Round a number up to the nearest 'size' boundary. size must
* be a power of 2.
*/
-static inline ulong round_up(ulong n, ulong size)
+static ulong round_up(ulong n, ulong size)
{
size--;
return (n + size) & ~size;
@@ -577,7 +578,7 @@
static void snapshot_dtr(struct dm_target *ti)
{
- struct dm_snapshot *s = (struct dm_snapshot *) ti->private;
+ struct dm_snapshot *s = ti->private;
flush_workqueue(ksnapd);
@@ -655,14 +656,14 @@
dm_table_event(s->table);
}
-static void get_pending_exception(struct pending_exception *pe)
+static void get_pending_exception(struct dm_snap_pending_exception *pe)
{
atomic_inc(&pe->ref_count);
}
-static struct bio *put_pending_exception(struct pending_exception *pe)
+static struct bio *put_pending_exception(struct dm_snap_pending_exception *pe)
{
- struct pending_exception *primary_pe;
+ struct dm_snap_pending_exception *primary_pe;
struct bio *origin_bios = NULL;
primary_pe = pe->primary_pe;
@@ -692,9 +693,9 @@
return origin_bios;
}
-static void pending_complete(struct pending_exception *pe, int success)
+static void pending_complete(struct dm_snap_pending_exception *pe, int success)
{
- struct exception *e;
+ struct dm_snap_exception *e;
struct dm_snapshot *s = pe->snap;
struct bio *origin_bios = NULL;
struct bio *snapshot_bios = NULL;
@@ -748,7 +749,8 @@
static void commit_callback(void *context, int success)
{
- struct pending_exception *pe = (struct pending_exception *) context;
+ struct dm_snap_pending_exception *pe = context;
+
pending_complete(pe, success);
}
@@ -758,7 +760,7 @@
*/
static void copy_callback(int read_err, unsigned int write_err, void *context)
{
- struct pending_exception *pe = (struct pending_exception *) context;
+ struct dm_snap_pending_exception *pe = context;
struct dm_snapshot *s = pe->snap;
if (read_err || write_err)
@@ -773,7 +775,7 @@
/*
* Dispatches the copy operation to kcopyd.
*/
-static void start_copy(struct pending_exception *pe)
+static void start_copy(struct dm_snap_pending_exception *pe)
{
struct dm_snapshot *s = pe->snap;
struct io_region src, dest;
@@ -803,11 +805,11 @@
* NOTE: a write lock must be held on snap->lock before calling
* this.
*/
-static struct pending_exception *
+static struct dm_snap_pending_exception *
__find_pending_exception(struct dm_snapshot *s, struct bio *bio)
{
- struct exception *e;
- struct pending_exception *pe;
+ struct dm_snap_exception *e;
+ struct dm_snap_pending_exception *pe;
chunk_t chunk = sector_to_chunk(s, bio->bi_sector);
/*
@@ -816,7 +818,7 @@
e = lookup_exception(&s->pending, chunk);
if (e) {
/* cast the exception to a pending exception */
- pe = container_of(e, struct pending_exception, e);
+ pe = container_of(e, struct dm_snap_pending_exception, e);
goto out;
}
@@ -836,7 +838,7 @@
e = lookup_exception(&s->pending, chunk);
if (e) {
free_pending_exception(pe);
- pe = container_of(e, struct pending_exception, e);
+ pe = container_of(e, struct dm_snap_pending_exception, e);
goto out;
}
@@ -860,8 +862,8 @@
return pe;
}
-static inline void remap_exception(struct dm_snapshot *s, struct exception *e,
- struct bio *bio)
+static void remap_exception(struct dm_snapshot *s, struct dm_snap_exception *e,
+ struct bio *bio)
{
bio->bi_bdev = s->cow->bdev;
bio->bi_sector = chunk_to_sector(s, e->new_chunk) +
@@ -871,11 +873,11 @@
static int snapshot_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
- struct exception *e;
- struct dm_snapshot *s = (struct dm_snapshot *) ti->private;
+ struct dm_snap_exception *e;
+ struct dm_snapshot *s = ti->private;
int r = DM_MAPIO_REMAPPED;
chunk_t chunk;
- struct pending_exception *pe = NULL;
+ struct dm_snap_pending_exception *pe = NULL;
chunk = sector_to_chunk(s, bio->bi_sector);
@@ -945,7 +947,7 @@
static void snapshot_resume(struct dm_target *ti)
{
- struct dm_snapshot *s = (struct dm_snapshot *) ti->private;
+ struct dm_snapshot *s = ti->private;
down_write(&s->lock);
s->active = 1;
@@ -955,7 +957,7 @@
static int snapshot_status(struct dm_target *ti, status_type_t type,
char *result, unsigned int maxlen)
{
- struct dm_snapshot *snap = (struct dm_snapshot *) ti->private;
+ struct dm_snapshot *snap = ti->private;
switch (type) {
case STATUSTYPE_INFO:
@@ -999,8 +1001,8 @@
{
int r = DM_MAPIO_REMAPPED, first = 0;
struct dm_snapshot *snap;
- struct exception *e;
- struct pending_exception *pe, *next_pe, *primary_pe = NULL;
+ struct dm_snap_exception *e;
+ struct dm_snap_pending_exception *pe, *next_pe, *primary_pe = NULL;
chunk_t chunk;
LIST_HEAD(pe_queue);
@@ -1147,14 +1149,14 @@
static void origin_dtr(struct dm_target *ti)
{
- struct dm_dev *dev = (struct dm_dev *) ti->private;
+ struct dm_dev *dev = ti->private;
dm_put_device(ti, dev);
}
static int origin_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
- struct dm_dev *dev = (struct dm_dev *) ti->private;
+ struct dm_dev *dev = ti->private;
bio->bi_bdev = dev->bdev;
if (unlikely(bio_barrier(bio)))
@@ -1172,7 +1174,7 @@
*/
static void origin_resume(struct dm_target *ti)
{
- struct dm_dev *dev = (struct dm_dev *) ti->private;
+ struct dm_dev *dev = ti->private;
struct dm_snapshot *snap;
struct origin *o;
chunk_t chunk_size = 0;
@@ -1190,7 +1192,7 @@
static int origin_status(struct dm_target *ti, status_type_t type, char *result,
unsigned int maxlen)
{
- struct dm_dev *dev = (struct dm_dev *) ti->private;
+ struct dm_dev *dev = ti->private;
switch (type) {
case STATUSTYPE_INFO:
@@ -1249,21 +1251,14 @@
goto bad2;
}
- exception_cache = kmem_cache_create("dm-snapshot-ex",
- sizeof(struct exception),
- __alignof__(struct exception),
- 0, NULL, NULL);
+ exception_cache = KMEM_CACHE(dm_snap_exception, 0);
if (!exception_cache) {
DMERR("Couldn't create exception cache.");
r = -ENOMEM;
goto bad3;
}
- pending_cache =
- kmem_cache_create("dm-snapshot-in",
- sizeof(struct pending_exception),
- __alignof__(struct pending_exception),
- 0, NULL, NULL);
+ pending_cache = KMEM_CACHE(dm_snap_pending_exception, 0);
if (!pending_cache) {
DMERR("Couldn't create pending cache.");
r = -ENOMEM;