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drbd: use the cached meta_dev_idx 

Now we have the cached meta_dev_idx member,
we can get rid of a few rcu_read_lock() sections and rcu_dereference().

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Lars Ellenberg 2013-03-19 18:16:45 +01:00 committed by Jens Axboe
parent 3a4d4eb3cb
commit 68e41a43f1
2 changed files with 6 additions and 33 deletions
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32
drivers/block/drbd/drbd_int.h
View File

@ -1777,9 +1777,9 @@ static inline void drbd_chk_io_error_(struct drbd_conf *mdev,
* BTW, for internal meta data, this happens to be the maximum capacity
* we could agree upon with our peer node.
*/
static inline sector_t _drbd_md_first_sector(int meta_dev_idx, struct drbd_backing_dev *bdev)
static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev)
{
switch (meta_dev_idx) {
switch (bdev->md.meta_dev_idx) {
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
return bdev->md.md_offset + bdev->md.bm_offset;
@ -1789,30 +1789,13 @@ static inline sector_t _drbd_md_first_sector(int meta_dev_idx, struct drbd_backi
}
}
static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev)
{
int meta_dev_idx;
rcu_read_lock();
meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
rcu_read_unlock();
return _drbd_md_first_sector(meta_dev_idx, bdev);
}
/**
* drbd_md_last_sector() - Return the last sector number of the meta data area
* @bdev: Meta data block device.
*/
static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev)
{
int meta_dev_idx;
rcu_read_lock();
meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
rcu_read_unlock();
switch (meta_dev_idx) {
switch (bdev->md.meta_dev_idx) {
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
return bdev->md.md_offset + MD_4kB_SECT -1;
@ -1840,18 +1823,13 @@ static inline sector_t drbd_get_capacity(struct block_device *bdev)
static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev)
{
sector_t s;
int meta_dev_idx;
rcu_read_lock();
meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
rcu_read_unlock();
switch (meta_dev_idx) {
switch (bdev->md.meta_dev_idx) {
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
s = drbd_get_capacity(bdev->backing_bdev)
? min_t(sector_t, DRBD_MAX_SECTORS_FLEX,
_drbd_md_first_sector(meta_dev_idx, bdev))
drbd_md_first_sector(bdev))
: 0;
break;
case DRBD_MD_INDEX_FLEX_EXT:

7
drivers/block/drbd/drbd_nl.c
View File

@ -722,14 +722,10 @@ static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
{
sector_t md_size_sect = 0;
unsigned int al_size_sect = MD_32kB_SECT;
int meta_dev_idx;
rcu_read_lock();
meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
bdev->md.md_offset = drbd_md_ss(bdev);
switch (meta_dev_idx) {
switch (bdev->md.meta_dev_idx) {
default:
/* v07 style fixed size indexed meta data */
bdev->md.md_size_sect = MD_128MB_SECT;
@ -761,7 +757,6 @@ static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
bdev->md.bm_offset = -md_size_sect + MD_4kB_SECT;
break;
}
rcu_read_unlock();
}
/* input size is expected to be in KB */