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authorPatrick Caulfield <pcaulfie@redhat.com>2006-02-01 03:04:51 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 08:53:10 -0800
commita4fc4717fc55a3bcd3cfdafa285b7af164b83051 (patch)
treebce42a0cc5a6675ab50fb6b525e4418b66863fdf /drivers
parentaa14edeb994f8f7e223d02ad14780bf2fa719f6d (diff)
[PATCH] device-mapper log bitset: fix endian
Clean up the code responsible for the on-disk mirror logs by using the set_le_bit test_le_bit functions of ext2. That makes the BE machines keep the bitmap internally in LE order - it does mean you can't use any other type of operations on the bitmap words but that looks to be OK in this instance. The efficiency tradeoff is very minimal as you would expect for something that ext2 uses. This allows us to remove bits_to_core(), bits_to_disk() and log->disk_bits. Also increment the mirror log disk version transparently to avoid sharing with older kernels that suffered from the 64-bit BE bug. Signed-off-by: Patrick Caulfield <pcaulfie@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-log.c45
1 files changed, 11 insertions, 34 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index efe4adf7853..74039db846b 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -112,7 +112,7 @@ void dm_destroy_dirty_log(struct dirty_log *log)
/*
* The on-disk version of the metadata.
*/
-#define MIRROR_DISK_VERSION 1
+#define MIRROR_DISK_VERSION 2
#define LOG_OFFSET 2
struct log_header {
@@ -157,7 +157,6 @@ struct log_c {
struct log_header *disk_header;
struct io_region bits_location;
- uint32_t *disk_bits;
};
/*
@@ -166,20 +165,20 @@ struct log_c {
*/
static inline int log_test_bit(uint32_t *bs, unsigned bit)
{
- return test_bit(bit, (unsigned long *) bs) ? 1 : 0;
+ return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0;
}
static inline void log_set_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
- set_bit(bit, (unsigned long *) bs);
+ ext2_set_bit(bit, (unsigned long *) bs);
l->touched = 1;
}
static inline void log_clear_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
- clear_bit(bit, (unsigned long *) bs);
+ ext2_clear_bit(bit, (unsigned long *) bs);
l->touched = 1;
}
@@ -219,6 +218,11 @@ static int read_header(struct log_c *log)
log->header.nr_regions = 0;
}
+#ifdef __LITTLE_ENDIAN
+ if (log->header.version == 1)
+ log->header.version = 2;
+#endif
+
if (log->header.version != MIRROR_DISK_VERSION) {
DMWARN("incompatible disk log version");
return -EINVAL;
@@ -239,45 +243,24 @@ static inline int write_header(struct log_c *log)
/*----------------------------------------------------------------
* Bits IO
*--------------------------------------------------------------*/
-static inline void bits_to_core(uint32_t *core, uint32_t *disk, unsigned count)
-{
- unsigned i;
-
- for (i = 0; i < count; i++)
- core[i] = le32_to_cpu(disk[i]);
-}
-
-static inline void bits_to_disk(uint32_t *core, uint32_t *disk, unsigned count)
-{
- unsigned i;
-
- /* copy across the clean/dirty bitset */
- for (i = 0; i < count; i++)
- disk[i] = cpu_to_le32(core[i]);
-}
-
static int read_bits(struct log_c *log)
{
int r;
unsigned long ebits;
r = dm_io_sync_vm(1, &log->bits_location, READ,
- log->disk_bits, &ebits);
+ log->clean_bits, &ebits);
if (r)
return r;
- bits_to_core(log->clean_bits, log->disk_bits,
- log->bitset_uint32_count);
return 0;
}
static int write_bits(struct log_c *log)
{
unsigned long ebits;
- bits_to_disk(log->clean_bits, log->disk_bits,
- log->bitset_uint32_count);
return dm_io_sync_vm(1, &log->bits_location, WRITE,
- log->disk_bits, &ebits);
+ log->clean_bits, &ebits);
}
/*----------------------------------------------------------------
@@ -433,11 +416,6 @@ static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
size = dm_round_up(lc->bitset_uint32_count * sizeof(uint32_t),
1 << SECTOR_SHIFT);
lc->bits_location.count = size >> SECTOR_SHIFT;
- lc->disk_bits = vmalloc(size);
- if (!lc->disk_bits) {
- vfree(lc->disk_header);
- goto bad;
- }
return 0;
bad:
@@ -451,7 +429,6 @@ 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);
- vfree(lc->disk_bits);
core_dtr(log);
}