From 0f4ab474fe8b773249bcf090640e730ef725fa59 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Wed, 2 Nov 2016 02:10:52 +0100 Subject: btrfs-progs: add dev stats on-disk structure Signed-off-by: David Sterba --- ctree.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'ctree.h') diff --git a/ctree.h b/ctree.h index a5917655..7f25d1e8 100644 --- a/ctree.h +++ b/ctree.h @@ -919,6 +919,14 @@ struct btrfs_file_extent_item { } __attribute__ ((__packed__)); +struct btrfs_dev_stats_item { + /* + * grow this item struct at the end for future enhancements and keep + * the existing values unchanged + */ + __le64 values[BTRFS_DEV_STAT_VALUES_MAX]; +} __attribute__ ((__packed__)); + struct btrfs_csum_item { u8 csum; } __attribute__ ((__packed__)); @@ -2333,6 +2341,19 @@ static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys( return &p->sys; } +/* + * btrfs_dev_stats_item helper, returns pointer to the raw array, do the + * endiannes conversion, @dsi is offset to eb data + */ +static inline __le64* btrfs_dev_stats_values(struct extent_buffer *eb, + struct btrfs_dev_stats_item *dsi) +{ + unsigned long offset = (unsigned long)dsi; + struct btrfs_dev_stats_item *p; + p = (struct btrfs_dev_stats_item *)(eb->data + offset); + return p->values; +} + /* * this returns the number of bytes used by the item on disk, minus the * size of any extent headers. If a file is compressed on disk, this is -- cgit v1.2.3