btrfs: add helper to describe block group flags (f89e09cf) · Commits · 戴 / test

fs/btrfs/relocation.c

+3 −27

Original line number	Diff line number	Diff line
		@@ -4185,37 +4185,13 @@ static struct reloc_control *alloc_reloc_control(void)
		static void describe_relocation(struct btrfs_fs_info *fs_info,
		struct btrfs_block_group_cache *block_group)
		{
		char buf[128]; /* prefixed by a '\|' that'll be dropped */
		u64 flags = block_group->flags;
		char buf[128] = {'\0'};

		/* Shouldn't happen */
		if (!flags) {
		strcpy(buf, "\|NONE");
		} else {
		char *bp = buf;

		#define DESCRIBE_FLAG(f, d) \
		if (flags & BTRFS_BLOCK_GROUP_##f) { \
		bp += snprintf(bp, buf - bp + sizeof(buf), "\|%s", d); \
		flags &= ~BTRFS_BLOCK_GROUP_##f; \
		}
		DESCRIBE_FLAG(DATA, "data");
		DESCRIBE_FLAG(SYSTEM, "system");
		DESCRIBE_FLAG(METADATA, "metadata");
		DESCRIBE_FLAG(RAID0, "raid0");
		DESCRIBE_FLAG(RAID1, "raid1");
		DESCRIBE_FLAG(DUP, "dup");
		DESCRIBE_FLAG(RAID10, "raid10");
		DESCRIBE_FLAG(RAID5, "raid5");
		DESCRIBE_FLAG(RAID6, "raid6");
		if (flags)
		snprintf(bp, buf - bp + sizeof(buf), "\|0x%llx", flags);
		#undef DESCRIBE_FLAG
		}
		btrfs_describe_block_groups(block_group->flags, buf, sizeof(buf));

		btrfs_info(fs_info,
		"relocating block group %llu flags %s",
		block_group->key.objectid, buf + 1);
		block_group->key.objectid, buf);
		}

		/*

+54 −0

Original line number	Diff line number	Diff line
		@@ -130,6 +130,60 @@ const char *get_raid_name(enum btrfs_raid_types type)
		return btrfs_raid_array[type].raid_name;
		}

		/*
		* Fill @buf with textual description of @bg_flags, no more than @size_buf
		* bytes including terminating null byte.
		*/
		void btrfs_describe_block_groups(u64 bg_flags, char *buf, u32 size_buf)
		{
		int i;
		int ret;
		char *bp = buf;
		u64 flags = bg_flags;
		u32 size_bp = size_buf;

		if (!flags) {
		strcpy(bp, "NONE");
		return;
		}

		#define DESCRIBE_FLAG(flag, desc) \
		do { \
		if (flags & (flag)) { \
		ret = snprintf(bp, size_bp, "%s\|", (desc)); \
		if (ret < 0 \|\| ret >= size_bp) \
		goto out_overflow; \
		size_bp -= ret; \
		bp += ret; \
		flags &= ~(flag); \
		} \
		} while (0)

		DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_DATA, "data");
		DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_SYSTEM, "system");
		DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_METADATA, "metadata");

		DESCRIBE_FLAG(BTRFS_AVAIL_ALLOC_BIT_SINGLE, "single");
		for (i = 0; i < BTRFS_NR_RAID_TYPES; i++)
		DESCRIBE_FLAG(btrfs_raid_array[i].bg_flag,
		btrfs_raid_array[i].raid_name);
		#undef DESCRIBE_FLAG

		if (flags) {
		ret = snprintf(bp, size_bp, "0x%llx\|", flags);
		size_bp -= ret;
		}

		if (size_bp < size_buf)
		buf[size_buf - size_bp - 1] = '\0'; /* remove last \| */

		/*
		* The text is trimmed, it's up to the caller to provide sufficiently
		* large buffer
		*/
		out_overflow:;
		}

		static int init_first_rw_device(struct btrfs_trans_handle *trans,
		struct btrfs_fs_info *fs_info);
		static int btrfs_relocate_sys_chunks(struct btrfs_fs_info *fs_info);

+1 −0

Original line number	Diff line number	Diff line
		@@ -438,6 +438,7 @@ int btrfs_init_new_device(struct btrfs_fs_info fs_info, const char path);
		int btrfs_balance(struct btrfs_fs_info *fs_info,
		struct btrfs_balance_control *bctl,
		struct btrfs_ioctl_balance_args *bargs);
		void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
		int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
		int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
		int btrfs_pause_balance(struct btrfs_fs_info *fs_info);