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author | Jonathan Brassow <jbrassow@redhat.com> | 2009-04-02 19:55:34 +0100 |
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committer | Alasdair G Kergon <agk@redhat.com> | 2009-04-02 19:55:34 +0100 |
commit | ccc45ea8aeffec49fa5985efc3649aa67bb4fcb7 (patch) | |
tree | 69a72e1a1599d3495224dcd425f0bb230a48108e /drivers/md/dm-snap.c | |
parent | 71fab00a6bef7fb53119271a8abdbaf40970d28a (diff) | |
download | kernel_samsung_tuna-ccc45ea8aeffec49fa5985efc3649aa67bb4fcb7.zip kernel_samsung_tuna-ccc45ea8aeffec49fa5985efc3649aa67bb4fcb7.tar.gz kernel_samsung_tuna-ccc45ea8aeffec49fa5985efc3649aa67bb4fcb7.tar.bz2 |
dm snapshot: remove dm_snap header
Move some of the last bits from dm-snap.h into dm-snap.c where they
belong and remove dm-snap.h.
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r-- | drivers/md/dm-snap.c | 72 |
1 files changed, 71 insertions, 1 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 467c586..bb28f97 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -20,9 +20,9 @@ #include <linux/vmalloc.h> #include <linux/log2.h> #include <linux/dm-kcopyd.h> +#include <linux/workqueue.h> #include "dm-exception-store.h" -#include "dm-snap.h" #include "dm-bio-list.h" #define DM_MSG_PREFIX "snapshots" @@ -47,9 +47,79 @@ */ #define MIN_IOS 256 +#define DM_TRACKED_CHUNK_HASH_SIZE 16 +#define DM_TRACKED_CHUNK_HASH(x) ((unsigned long)(x) & \ + (DM_TRACKED_CHUNK_HASH_SIZE - 1)) + +struct exception_table { + uint32_t hash_mask; + unsigned hash_shift; + struct list_head *table; +}; + +struct dm_snapshot { + struct rw_semaphore lock; + + struct dm_dev *origin; + + /* List of snapshots per Origin */ + struct list_head list; + + /* You can't use a snapshot if this is 0 (e.g. if full) */ + int valid; + + /* Origin writes don't trigger exceptions until this is set */ + int active; + + /* Used for display of table */ + char type; + + mempool_t *pending_pool; + + atomic_t pending_exceptions_count; + + struct exception_table pending; + struct exception_table complete; + + /* + * pe_lock protects all pending_exception operations and access + * as well as the snapshot_bios list. + */ + spinlock_t pe_lock; + + /* The on disk metadata handler */ + struct dm_exception_store *store; + + struct dm_kcopyd_client *kcopyd_client; + + /* Queue of snapshot writes for ksnapd to flush */ + struct bio_list queued_bios; + struct work_struct queued_bios_work; + + /* Chunks with outstanding reads */ + mempool_t *tracked_chunk_pool; + spinlock_t tracked_chunk_lock; + struct hlist_head tracked_chunk_hash[DM_TRACKED_CHUNK_HASH_SIZE]; +}; + static struct workqueue_struct *ksnapd; static void flush_queued_bios(struct work_struct *work); +static sector_t chunk_to_sector(struct dm_exception_store *store, + chunk_t chunk) +{ + return chunk << store->chunk_shift; +} + +static int bdev_equal(struct block_device *lhs, struct block_device *rhs) +{ + /* + * There is only ever one instance of a particular block + * device so we can compare pointers safely. + */ + return lhs == rhs; +} + struct dm_snap_pending_exception { struct dm_snap_exception e; |