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Commit 2c458045 authored Jul 16, 2015 by Zhao Lei Committed by Chris Mason Aug 31, 2015

btrfs: Cleanup for btrfs_calc_num_tolerated_disk_barrier_failures



1: Use ARRAY_SIZE(types) to replace a static-value variant:
   int num_types = 4;

2: Use 'continue' on condition to reduce one level tab
   if (!XXX) {
       code;
       ...
   }
   ->
   if (XXX)
       continue;
   code;
   ...

3: Put setting 'num_tolerated_disk_barrier_failures = 2' to
   (num_tolerated_disk_barrier_failures > 2) condition to make
   make logic neat.
   if (num_tolerated_disk_barrier_failures > 0 && XXX)
       num_tolerated_disk_barrier_failures = 0;
   else if (num_tolerated_disk_barrier_failures > 1) {
       if (XXX)
           num_tolerated_disk_barrier_failures = 1;
       else if (XXX)
           num_tolerated_disk_barrier_failures = 2;
   ->
   if (num_tolerated_disk_barrier_failures > 0 && XXX)
       num_tolerated_disk_barrier_failures = 0;
   if (num_tolerated_disk_barrier_failures > 1 && XXX)
       num_tolerated_disk_barrier_failures = ;
   if (num_tolerated_disk_barrier_failures > 2 && XXX)
       num_tolerated_disk_barrier_failures = 2;

4: Remove comment of:
   num_mirrors - 1: if RAID1 or RAID10 is configured and more
   than 2 mirrors are used.
   which is not fit with code.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

parent 8c204c96

fs/btrfs/disk-io.c

+33 −40

Original line number	Diff line number	Diff line
		@@ -3449,13 +3449,12 @@ int btrfs_calc_num_tolerated_disk_barrier_failures(
		BTRFS_BLOCK_GROUP_SYSTEM,
		BTRFS_BLOCK_GROUP_METADATA,
		BTRFS_BLOCK_GROUP_DATA \| BTRFS_BLOCK_GROUP_METADATA};
		int num_types = 4;
		int i;
		int c;
		int num_tolerated_disk_barrier_failures =
		(int)fs_info->fs_devices->num_devices;

		for (i = 0; i < num_types; i++) {
		for (i = 0; i < ARRAY_SIZE(types); i++) {
		struct btrfs_space_info *tmp;

		sinfo = NULL;
		@@ -3473,13 +3472,14 @@ int btrfs_calc_num_tolerated_disk_barrier_failures(

		down_read(&sinfo->groups_sem);
		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
		if (!list_empty(&sinfo->block_groups[c])) {
		u64 flags;

		btrfs_get_block_group_info(
		&sinfo->block_groups[c], &space);
		if (space.total_bytes == 0 \|\|
		space.used_bytes == 0)
		if (list_empty(&sinfo->block_groups[c]))
		continue;

		btrfs_get_block_group_info(&sinfo->block_groups[c],
		&space);
		if (space.total_bytes == 0 \|\| space.used_bytes == 0)
		continue;
		flags = space.flags;
		/*
		@@ -3489,29 +3489,22 @@ int btrfs_calc_num_tolerated_disk_barrier_failures(
		* 1: if RAID5 is configured, or if RAID1 or
		* RAID10 is configured and only two mirrors
		* are used, else
		* 2: if RAID6 is configured, else
		* num_mirrors - 1: if RAID1 or RAID10 is
		* configured and more than
		* 2 mirrors are used.
		* 2: if RAID6 is configured
		*/
		if (num_tolerated_disk_barrier_failures > 0 &&
		((flags & (BTRFS_BLOCK_GROUP_DUP \|
		BTRFS_BLOCK_GROUP_RAID0)) \|\|
		((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK)
		== 0)))
		((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)))
		num_tolerated_disk_barrier_failures = 0;
		else if (num_tolerated_disk_barrier_failures > 1) {
		if (flags & (BTRFS_BLOCK_GROUP_RAID1 \|
		else if (num_tolerated_disk_barrier_failures > 1 &&
		(flags & (BTRFS_BLOCK_GROUP_RAID1 \|
		BTRFS_BLOCK_GROUP_RAID5 \|
		BTRFS_BLOCK_GROUP_RAID10)) {
		BTRFS_BLOCK_GROUP_RAID10)))
		num_tolerated_disk_barrier_failures = 1;
		} else if (flags &
		BTRFS_BLOCK_GROUP_RAID6) {
		else if (num_tolerated_disk_barrier_failures > 2 &&
		(flags & BTRFS_BLOCK_GROUP_RAID6))
		num_tolerated_disk_barrier_failures = 2;
		}
		}
		}
		}
		up_read(&sinfo->groups_sem);
		}

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