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btrfs-progs: add dev stats on-disk structure 

Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2016-11-02 02:10:52 +01:00
parent b74dbb86c0
commit 0f4ab474fe
1 changed files with 21 additions and 0 deletions
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21
ctree.h
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@ -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