dm log: avoid reinitialising io_req on every operation
rw_header function updates three members of io_req data every time when I/O is processed. bi_rw and notify.fn are never modified once they get initialized, and so they can be set in advance. header_to_disk() can also be pulled out of write_header() since only one caller needs it and write_header() can be replaced by rw_header() directly. Signed-off-by: Takahiro Yasui <tyasui@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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@ -326,8 +326,6 @@ static void header_from_disk(struct log_header *core, struct log_header *disk)
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static int rw_header(struct log_c *lc, int rw)
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{
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lc->io_req.bi_rw = rw;
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lc->io_req.mem.ptr.vma = lc->disk_header;
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lc->io_req.notify.fn = NULL;
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return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
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}
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@ -362,12 +360,6 @@ static int read_header(struct log_c *log)
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return 0;
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}
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static inline int write_header(struct log_c *log)
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{
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header_to_disk(&log->header, log->disk_header);
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return rw_header(log, WRITE);
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}
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/*----------------------------------------------------------------
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* core log constructor/destructor
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*
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@ -454,7 +446,9 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
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buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
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bitset_size, ti->limits.hardsect_size);
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lc->header_location.count = buf_size >> SECTOR_SHIFT;
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lc->io_req.mem.type = DM_IO_VMA;
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lc->io_req.notify.fn = NULL;
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lc->io_req.client = dm_io_client_create(dm_div_up(buf_size,
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PAGE_SIZE));
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if (IS_ERR(lc->io_req.client)) {
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@ -472,6 +466,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
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return -ENOMEM;
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}
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lc->io_req.mem.ptr.vma = lc->disk_header;
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lc->clean_bits = (void *)lc->disk_header +
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(LOG_OFFSET << SECTOR_SHIFT);
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}
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@ -636,8 +631,10 @@ static int disk_resume(struct dm_dirty_log *log)
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/* set the correct number of regions in the header */
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lc->header.nr_regions = lc->region_count;
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header_to_disk(&lc->header, lc->disk_header);
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/* write the new header */
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r = write_header(lc);
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r = rw_header(lc, WRITE);
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if (r) {
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DMWARN("%s: Failed to write header on dirty region log device",
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lc->log_dev->name);
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@ -687,7 +684,7 @@ static int disk_flush(struct dm_dirty_log *log)
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if (!lc->touched)
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return 0;
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r = write_header(lc);
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r = rw_header(lc, WRITE);
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if (r)
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fail_log_device(lc);
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else
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