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bcachefs: improve/clarify ptr_disk_sectors()

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2018-12-06 11:52:58 -05:00 committed by Kent Overstreet
parent 57cb2142ed
commit 641ab73643
3 changed files with 37 additions and 32 deletions
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47
fs/bcachefs/buckets.c
View file

@ -558,36 +558,25 @@ void bch2_mark_metadata_bucket(struct bch_fs *c, struct bch_dev *ca,
preempt_enable();
}
static int __disk_sectors(struct bch_extent_crc_unpacked crc, unsigned sectors)
static s64 ptr_disk_sectors_delta(struct extent_ptr_decoded p,
s64 delta)
{
if (!sectors)
return 0;
if (delta > 0) {
/*
* marking a new extent, which _will have size_ @delta
*
* in the bch2_mark_update -> BCH_EXTENT_OVERLAP_MIDDLE
* case, we haven't actually created the key we'll be inserting
* yet (for the split) - so we don't want to be using
* k->size/crc.live_size here:
*/
return __ptr_disk_sectors(p, delta);
} else {
BUG_ON(-delta > p.crc.live_size);
return max(1U, DIV_ROUND_UP(sectors * crc.compressed_size,
crc.uncompressed_size));
}
static s64 ptr_disk_sectors(const struct bkey *k,
struct extent_ptr_decoded p,
s64 sectors)
{
if (p.crc.compression_type) {
unsigned old_sectors, new_sectors;
if (sectors > 0) {
old_sectors = 0;
new_sectors = sectors;
} else {
old_sectors = k->size;
new_sectors = k->size + sectors;
}
sectors = -__disk_sectors(p.crc, old_sectors)
+__disk_sectors(p.crc, new_sectors);
return (s64) __ptr_disk_sectors(p, p.crc.live_size + delta) -
(s64) ptr_disk_sectors(p);
}
return sectors;
}
/*
@ -722,7 +711,9 @@ static int bch2_mark_extent(struct bch_fs *c, struct bkey_s_c k,
BUG_ON(!sectors);
bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
s64 disk_sectors = ptr_disk_sectors(k.k, p, sectors);
s64 disk_sectors = data_type == BCH_DATA_BTREE
? sectors
: ptr_disk_sectors_delta(p, sectors);
s64 adjusted_disk_sectors = disk_sectors;
bch2_mark_pointer(c, p, disk_sectors, data_type,

14
fs/bcachefs/buckets.h
View file

@ -136,6 +136,20 @@ static inline u8 ptr_stale(struct bch_dev *ca,
return gen_after(ptr_bucket_mark(ca, ptr).gen, ptr->gen);
}
static inline unsigned __ptr_disk_sectors(struct extent_ptr_decoded p,
unsigned live_size)
{
return live_size && p.crc.compression_type
? max(1U, DIV_ROUND_UP(live_size * p.crc.compressed_size,
p.crc.uncompressed_size))
: live_size;
}
static inline unsigned ptr_disk_sectors(struct extent_ptr_decoded p)
{
return __ptr_disk_sectors(p, p.crc.live_size);
}
/* bucket gc marks */
static inline unsigned bucket_sectors_used(struct bucket_mark mark)

8
fs/bcachefs/extents_types.h
View file

@ -5,14 +5,14 @@
#include "bcachefs_format.h"
struct bch_extent_crc_unpacked {
u32 compressed_size;
u32 uncompressed_size;
u32 live_size;
u8 csum_type;
u8 compression_type;
u16 compressed_size;
u16 uncompressed_size;
u16 offset;
u16 live_size;
u16 nonce;