[Drbd-dev] [PATCH] drbd: deinline __drbd_chk_io_error_()
Denys Vlasenko
dvlasenk at redhat.com
Wed May 6 21:00:21 CEST 2015
The function compiles to 552 bytes of machine code.
On x86 allyesconfig build it has 8 callsites.
Deinlining it shrinks kernel by more than 1k:
text data bss dec hex filename
82433898 22255384 20627456 125316738 7782e82 vmlinux.before
82432426 22255384 20627456 125315266 77828c2 vmlinux
Signed-off-by: Denys Vlasenko <dvlasenk at redhat.com>
CC: Andreas Gruenbacher <agruen at linbit.com>
CC: Philipp Reisner <philipp.reisner at linbit.com>
CC: Lars Ellenberg <lars.ellenberg at linbit.com>
CC: Jens Axboe <axboe at fb.com>
CC: drbd-dev at lists.linbit.com
CC: linux-kernel at vger.kernel.org
---
drivers/block/drbd/drbd_int.h | 55 ++----------------------------------------
drivers/block/drbd/drbd_main.c | 55 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+), 53 deletions(-)
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index b905e98..74a7afd 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1727,60 +1727,9 @@ enum drbd_force_detach_flags {
};
#define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__)
-static inline void __drbd_chk_io_error_(struct drbd_device *device,
+void __drbd_chk_io_error_(struct drbd_device *device,
enum drbd_force_detach_flags df,
- const char *where)
-{
- enum drbd_io_error_p ep;
-
- rcu_read_lock();
- ep = rcu_dereference(device->ldev->disk_conf)->on_io_error;
- rcu_read_unlock();
- switch (ep) {
- case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */
- if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) {
- if (__ratelimit(&drbd_ratelimit_state))
- drbd_err(device, "Local IO failed in %s.\n", where);
- if (device->state.disk > D_INCONSISTENT)
- _drbd_set_state(_NS(device, disk, D_INCONSISTENT), CS_HARD, NULL);
- break;
- }
- /* NOTE fall through for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */
- case EP_DETACH:
- case EP_CALL_HELPER:
- /* Remember whether we saw a READ or WRITE error.
- *
- * Recovery of the affected area for WRITE failure is covered
- * by the activity log.
- * READ errors may fall outside that area though. Certain READ
- * errors can be "healed" by writing good data to the affected
- * blocks, which triggers block re-allocation in lower layers.
- *
- * If we can not write the bitmap after a READ error,
- * we may need to trigger a full sync (see w_go_diskless()).
- *
- * Force-detach is not really an IO error, but rather a
- * desperate measure to try to deal with a completely
- * unresponsive lower level IO stack.
- * Still it should be treated as a WRITE error.
- *
- * Meta IO error is always WRITE error:
- * we read meta data only once during attach,
- * which will fail in case of errors.
- */
- set_bit(WAS_IO_ERROR, &device->flags);
- if (df == DRBD_READ_ERROR)
- set_bit(WAS_READ_ERROR, &device->flags);
- if (df == DRBD_FORCE_DETACH)
- set_bit(FORCE_DETACH, &device->flags);
- if (device->state.disk > D_FAILED) {
- _drbd_set_state(_NS(device, disk, D_FAILED), CS_HARD, NULL);
- drbd_err(device,
- "Local IO failed in %s. Detaching...\n", where);
- }
- break;
- }
-}
+ const char *where);
/**
* drbd_chk_io_error: Handle the on_io_error setting, should be called from all io completion handlers
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 1fc8342..10f27e6 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -146,6 +146,61 @@ static const struct block_device_operations drbd_ops = {
.release = drbd_release,
};
+void __drbd_chk_io_error_(struct drbd_device *device,
+ enum drbd_force_detach_flags df,
+ const char *where)
+{
+ enum drbd_io_error_p ep;
+
+ rcu_read_lock();
+ ep = rcu_dereference(device->ldev->disk_conf)->on_io_error;
+ rcu_read_unlock();
+ switch (ep) {
+ case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */
+ if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) {
+ if (__ratelimit(&drbd_ratelimit_state))
+ drbd_err(device, "Local IO failed in %s.\n", where);
+ if (device->state.disk > D_INCONSISTENT)
+ _drbd_set_state(_NS(device, disk, D_INCONSISTENT), CS_HARD, NULL);
+ break;
+ }
+ /* NOTE fall through for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */
+ case EP_DETACH:
+ case EP_CALL_HELPER:
+ /* Remember whether we saw a READ or WRITE error.
+ *
+ * Recovery of the affected area for WRITE failure is covered
+ * by the activity log.
+ * READ errors may fall outside that area though. Certain READ
+ * errors can be "healed" by writing good data to the affected
+ * blocks, which triggers block re-allocation in lower layers.
+ *
+ * If we can not write the bitmap after a READ error,
+ * we may need to trigger a full sync (see w_go_diskless()).
+ *
+ * Force-detach is not really an IO error, but rather a
+ * desperate measure to try to deal with a completely
+ * unresponsive lower level IO stack.
+ * Still it should be treated as a WRITE error.
+ *
+ * Meta IO error is always WRITE error:
+ * we read meta data only once during attach,
+ * which will fail in case of errors.
+ */
+ set_bit(WAS_IO_ERROR, &device->flags);
+ if (df == DRBD_READ_ERROR)
+ set_bit(WAS_READ_ERROR, &device->flags);
+ if (df == DRBD_FORCE_DETACH)
+ set_bit(FORCE_DETACH, &device->flags);
+ if (device->state.disk > D_FAILED) {
+ _drbd_set_state(_NS(device, disk, D_FAILED), CS_HARD, NULL);
+ drbd_err(device,
+ "Local IO failed in %s. Detaching...\n", where);
+ }
+ break;
+ }
+}
+
struct bio *bio_alloc_drbd(gfp_t gfp_mask)
{
struct bio *bio;
--
1.8.1.4
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