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dm log: update dm io interface

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This patch ports dm-log.c to the new dm-io interface in order to make it
scalable to have a large number of persistent dirty logs active in parallel.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Cc: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Heinz Mauelshagen 2007-05-09 02:33:03 -07:00 committed by Linus Torvalds
parent 6cca1e7af5
commit 5d234d1e03
1 changed files with 24 additions and 7 deletions
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31
drivers/md/dm-log.c
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@ -149,6 +149,8 @@ struct log_c {
FORCESYNC, /* Force a sync to happen */
} sync;
struct dm_io_request io_req;
/*
* Disk log fields
*/
@ -200,13 +202,20 @@ static void header_from_disk(struct log_header *core, struct log_header *disk)
core->nr_regions = le64_to_cpu(disk->nr_regions);
}
static int rw_header(struct log_c *lc, int rw)
{
lc->io_req.bi_rw = rw;
lc->io_req.mem.ptr.vma = lc->disk_header;
lc->io_req.notify.fn = NULL;
return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
}
static int read_header(struct log_c *log)
{
int r;
unsigned long ebits;
r = dm_io_sync_vm(1, &log->header_location, READ,
log->disk_header, &ebits);
r = rw_header(log, READ);
if (r)
return r;
@ -234,11 +243,8 @@ static int read_header(struct log_c *log)
static inline int write_header(struct log_c *log)
{
unsigned long ebits;
header_to_disk(&log->header, log->disk_header);
return dm_io_sync_vm(1, &log->header_location, WRITE,
log->disk_header, &ebits);
return rw_header(log, WRITE);
}
/*----------------------------------------------------------------
@ -257,6 +263,7 @@ static int create_log_context(struct dirty_log *log, struct dm_target *ti,
uint32_t region_size;
unsigned int region_count;
size_t bitset_size, buf_size;
int r;
if (argc < 1 || argc > 2) {
DMWARN("wrong number of arguments to mirror log");
@ -326,6 +333,15 @@ static int create_log_context(struct dirty_log *log, struct dm_target *ti,
buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
bitset_size, ti->limits.hardsect_size);
lc->header_location.count = buf_size >> SECTOR_SHIFT;
lc->io_req.mem.type = DM_IO_VMA;
lc->io_req.client = dm_io_client_create(dm_div_up(buf_size,
PAGE_SIZE));
if (IS_ERR(lc->io_req.client)) {
r = PTR_ERR(lc->io_req.client);
DMWARN("couldn't allocate disk io client");
kfree(lc);
return -ENOMEM;
}
lc->disk_header = vmalloc(buf_size);
if (!lc->disk_header) {
@ -426,6 +442,7 @@ static void disk_dtr(struct dirty_log *log)
dm_put_device(lc->ti, lc->log_dev);
vfree(lc->disk_header);
dm_io_client_destroy(lc->io_req.client);
destroy_log_context(lc);
}