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dm snapshot: extend exception store functions

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Supply dm_add_exception as a callback to the read_metadata function.
Add a status function ready for a later patch and name the functions
consistently.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Jonathan Brassow
2009-01-06 03:05:19 +00:00
committed by Alasdair G Kergon
parent 4db6bfe02b
commit a159c1ac5f
6 changed files with 55 additions and 37 deletions
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drivers/md/dm-snap-persistent.c
+26 -16
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@@ -395,7 +395,11 @@ static void write_exception(struct pstore *ps,
* 'full' is filled in to indicate if the area has been
* filled.
*/
static int insert_exceptions(struct pstore *ps, int *full)
static int insert_exceptions(struct pstore *ps,
int (*callback)(void *callback_context,
chunk_t old, chunk_t new),
void *callback_context,
int *full)
{
int r;
unsigned int i;
@@ -428,7 +432,7 @@ static int insert_exceptions(struct pstore *ps, int *full)
/*
* Otherwise we add the exception to the snapshot.
*/
r = dm_add_exception(ps->snap, de.old_chunk, de.new_chunk);
r = callback(callback_context, de.old_chunk, de.new_chunk);
if (r)
return r;
}
@@ -436,7 +440,10 @@ static int insert_exceptions(struct pstore *ps, int *full)
return 0;
}
static int read_exceptions(struct pstore *ps)
static int read_exceptions(struct pstore *ps,
int (*callback)(void *callback_context, chunk_t old,
chunk_t new),
void *callback_context)
{
int r, full = 1;
@@ -449,7 +456,7 @@ static int read_exceptions(struct pstore *ps)
if (r)
return r;
r = insert_exceptions(ps, &full);
r = insert_exceptions(ps, callback, callback_context, &full);
if (r)
return r;
}
@@ -482,7 +489,10 @@ static void persistent_destroy(struct dm_exception_store *store)
kfree(ps);
}
static int persistent_read_metadata(struct dm_exception_store *store)
static int persistent_read_metadata(struct dm_exception_store *store,
int (*callback)(void *callback_context,
chunk_t old, chunk_t new),
void *callback_context)
{
int r, uninitialized_var(new_snapshot);
struct pstore *ps = get_info(store);
@@ -540,7 +550,7 @@ static int persistent_read_metadata(struct dm_exception_store *store)
/*
* Read the metadata.
*/
r = read_exceptions(ps);
r = read_exceptions(ps, callback, callback_context);
if (r)
return r;
}
@@ -548,8 +558,8 @@ static int persistent_read_metadata(struct dm_exception_store *store)
return 0;
}
static int persistent_prepare(struct dm_exception_store *store,
struct dm_snap_exception *e)
static int persistent_prepare_exception(struct dm_exception_store *store,
struct dm_snap_exception *e)
{
struct pstore *ps = get_info(store);
uint32_t stride;
@@ -575,10 +585,10 @@ static int persistent_prepare(struct dm_exception_store *store,
return 0;
}
static void persistent_commit(struct dm_exception_store *store,
struct dm_snap_exception *e,
void (*callback) (void *, int success),
void *callback_context)
static void persistent_commit_exception(struct dm_exception_store *store,
struct dm_snap_exception *e,
void (*callback) (void *, int success),
void *callback_context)
{
unsigned int i;
struct pstore *ps = get_info(store);
@@ -637,7 +647,7 @@ static void persistent_commit(struct dm_exception_store *store,
ps->callback_count = 0;
}
static void persistent_drop(struct dm_exception_store *store)
static void persistent_drop_snapshot(struct dm_exception_store *store)
{
struct pstore *ps = get_info(store);
@@ -675,9 +685,9 @@ int dm_create_persistent(struct dm_exception_store *store)
store->destroy = persistent_destroy;
store->read_metadata = persistent_read_metadata;
store->prepare_exception = persistent_prepare;
store->commit_exception = persistent_commit;
store->drop_snapshot = persistent_drop;
store->prepare_exception = persistent_prepare_exception;
store->commit_exception = persistent_commit_exception;
store->drop_snapshot = persistent_drop_snapshot;
store->fraction_full = persistent_fraction_full;
store->context = ps;