Refactor the code that creates the core and disk log contexts to avoid
the repeated allocation of clean_bits introduced by the last patch.
Signed-off-by: Alasdair G Kergon <[email protected]>
Index: linux-2.6.17/drivers/md/dm-log.c
===================================================================
--- linux-2.6.17.orig/drivers/md/dm-log.c 2006-06-21 17:17:49.000000000 +0100
+++ linux-2.6.17/drivers/md/dm-log.c 2006-06-21 17:17:55.000000000 +0100
@@ -244,15 +244,16 @@ static inline int write_header(struct lo
* argv contains region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
#define BYTE_SHIFT 3
-static int core_ctr(struct dirty_log *log, struct dm_target *ti,
- unsigned int argc, char **argv)
+static int create_log_context(struct dirty_log *log, struct dm_target *ti,
+ unsigned int argc, char **argv,
+ struct dm_dev *dev)
{
enum sync sync = DEFAULTSYNC;
struct log_c *lc;
uint32_t region_size;
unsigned int region_count;
- size_t bitset_size;
+ size_t bitset_size, buf_size;
if (argc < 1 || argc > 2) {
DMWARN("wrong number of arguments to mirror log");
@@ -298,18 +299,49 @@ static int core_ctr(struct dirty_log *lo
bitset_size >>= BYTE_SHIFT;
lc->bitset_uint32_count = bitset_size / 4;
- lc->clean_bits = vmalloc(bitset_size);
- if (!lc->clean_bits) {
- DMWARN("couldn't allocate clean bitset");
- kfree(lc);
- return -ENOMEM;
+
+ /*
+ * Disk log?
+ */
+ if (!dev) {
+ lc->clean_bits = vmalloc(bitset_size);
+ if (!lc->clean_bits) {
+ DMWARN("couldn't allocate clean bitset");
+ kfree(lc);
+ return -ENOMEM;
+ }
+ lc->disk_header = NULL;
+ } else {
+ lc->log_dev = dev;
+ lc->header_location.bdev = lc->log_dev->bdev;
+ lc->header_location.sector = 0;
+
+ /*
+ * Buffer holds both header and bitset.
+ */
+ buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
+ bitset_size, ti->limits.hardsect_size);
+ lc->header_location.count = buf_size >> SECTOR_SHIFT;
+
+ lc->disk_header = vmalloc(buf_size);
+ if (!lc->disk_header) {
+ DMWARN("couldn't allocate disk log buffer");
+ kfree(lc);
+ return -ENOMEM;
+ }
+
+ lc->clean_bits = (void *)lc->disk_header +
+ (LOG_OFFSET << SECTOR_SHIFT);
}
+
memset(lc->clean_bits, -1, bitset_size);
lc->sync_bits = vmalloc(bitset_size);
if (!lc->sync_bits) {
DMWARN("couldn't allocate sync bitset");
- vfree(lc->clean_bits);
+ if (!dev)
+ vfree(lc->clean_bits);
+ vfree(lc->disk_header);
kfree(lc);
return -ENOMEM;
}
@@ -320,25 +352,40 @@ static int core_ctr(struct dirty_log *lo
if (!lc->recovering_bits) {
DMWARN("couldn't allocate sync bitset");
vfree(lc->sync_bits);
- vfree(lc->clean_bits);
+ if (!dev)
+ vfree(lc->clean_bits);
+ vfree(lc->disk_header);
kfree(lc);
return -ENOMEM;
}
memset(lc->recovering_bits, 0, bitset_size);
lc->sync_search = 0;
log->context = lc;
+
return 0;
}
-static void core_dtr(struct dirty_log *log)
+static int core_ctr(struct dirty_log *log, struct dm_target *ti,
+ unsigned int argc, char **argv)
+{
+ return create_log_context(log, ti, argc, argv, NULL);
+}
+
+static void destroy_log_context(struct log_c *lc)
{
- struct log_c *lc = (struct log_c *) log->context;
- vfree(lc->clean_bits);
vfree(lc->sync_bits);
vfree(lc->recovering_bits);
kfree(lc);
}
+static void core_dtr(struct dirty_log *log)
+{
+ struct log_c *lc = (struct log_c *) log->context;
+
+ vfree(lc->clean_bits);
+ destroy_log_context(lc);
+}
+
/*----------------------------------------------------------------
* disk log constructor/destructor
*
@@ -348,10 +395,7 @@ static int disk_ctr(struct dirty_log *lo
unsigned int argc, char **argv)
{
int r;
- size_t size, bitset_size;
- struct log_c *lc;
struct dm_dev *dev;
- uint32_t *clean_bits;
if (argc < 2 || argc > 3) {
DMWARN("wrong number of arguments to disk mirror log");
@@ -363,53 +407,22 @@ static int disk_ctr(struct dirty_log *lo
if (r)
return r;
- r = core_ctr(log, ti, argc - 1, argv + 1);
+ r = create_log_context(log, ti, argc - 1, argv + 1, dev);
if (r) {
dm_put_device(ti, dev);
return r;
}
- lc = (struct log_c *) log->context;
- lc->log_dev = dev;
-
- /* setup the disk header fields */
- lc->header_location.bdev = lc->log_dev->bdev;
- lc->header_location.sector = 0;
-
- /* Include both the header and the bitset in one buffer. */
- bitset_size = lc->bitset_uint32_count * sizeof(uint32_t);
- size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size,
- ti->limits.hardsect_size);
- lc->header_location.count = size >> SECTOR_SHIFT;
-
- lc->disk_header = vmalloc(size);
- if (!lc->disk_header)
- goto bad;
-
- /*
- * Deallocate the clean_bits buffer that was allocated in core_ctr()
- * and point it at the appropriate place in the disk_header buffer.
- */
- clean_bits = lc->clean_bits;
- lc->clean_bits = (void *)lc->disk_header + (LOG_OFFSET << SECTOR_SHIFT);
- memcpy(lc->clean_bits, clean_bits, bitset_size);
- vfree(clean_bits);
-
return 0;
-
- bad:
- dm_put_device(ti, lc->log_dev);
- core_dtr(log);
- return -ENOMEM;
}
static void disk_dtr(struct dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
+
dm_put_device(lc->ti, lc->log_dev);
vfree(lc->disk_header);
- lc->clean_bits = NULL;
- core_dtr(log);
+ destroy_log_context(lc);
}
static int count_bits32(uint32_t *addr, unsigned size)
-
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