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path: root/drivers/md/dm-snap.c
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Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r--drivers/md/dm-snap.c116
1 files changed, 54 insertions, 62 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 0821a2b68a7..83ddbfe6b8a 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 @@ struct pending_exception {
* 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 @@ static void exit_origin_hash(void)
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 int init_exception_table(struct exception_table *et, uint32_t size)
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 @@ static void exit_exception_table(struct exception_table *et, struct kmem_cache *
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 @@ static inline void remove_exception(struct exception *e)
* 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 @@ static struct exception *lookup_exception(struct exception_table *et,
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 @@ static inline struct exception *alloc_exception(void)
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 @@ static int calc_max_buckets(void)
/*
* 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 @@ static int init_hash_tables(struct dm_snapshot *s)
* 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;
@@ -522,9 +523,12 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
/* Metadata must only be loaded into one table at once */
r = s->store.read_metadata(&s->store);
- if (r) {
+ if (r < 0) {
ti->error = "Failed to read snapshot metadata";
goto bad6;
+ } else if (r > 0) {
+ s->valid = 0;
+ DMWARN("Snapshot is marked invalid.");
}
bio_list_init(&s->queued_bios);
@@ -577,7 +581,7 @@ static void __free_exceptions(struct dm_snapshot *s)
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 +659,14 @@ static void __invalidate_snapshot(struct dm_snapshot *s, int err)
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 +696,9 @@ static struct bio *put_pending_exception(struct pending_exception *pe)
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 +752,8 @@ static void pending_complete(struct pending_exception *pe, int success)
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 +763,7 @@ static void commit_callback(void *context, int success)
*/
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 +778,7 @@ static void copy_callback(int read_err, unsigned int write_err, void *context)
/*
* 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 +808,11 @@ static void start_copy(struct pending_exception *pe)
* 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 +821,7 @@ __find_pending_exception(struct dm_snapshot *s, struct bio *bio)
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 +841,7 @@ __find_pending_exception(struct dm_snapshot *s, struct bio *bio)
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 +865,8 @@ __find_pending_exception(struct dm_snapshot *s, struct bio *bio)
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 +876,11 @@ static inline void remap_exception(struct dm_snapshot *s, struct exception *e,
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);
@@ -884,9 +889,6 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
if (!s->valid)
return -EIO;
- if (unlikely(bio_barrier(bio)))
- return -EOPNOTSUPP;
-
/* FIXME: should only take write lock if we need
* to copy an exception */
down_write(&s->lock);
@@ -945,7 +947,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
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 void snapshot_resume(struct dm_target *ti)
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 @@ static int __origin_write(struct list_head *snapshots, struct bio *bio)
{
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);
@@ -1147,19 +1149,16 @@ static int origin_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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)))
- return -EOPNOTSUPP;
-
/* Only tell snapshots if this is a write */
return (bio_rw(bio) == WRITE) ? do_origin(dev, bio) : DM_MAPIO_REMAPPED;
}
@@ -1172,7 +1171,7 @@ static int origin_map(struct dm_target *ti, struct bio *bio,
*/
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 +1189,7 @@ static void origin_resume(struct dm_target *ti)
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 +1248,14 @@ static int __init dm_snapshot_init(void)
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;