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bcachefs: Refactor __bch2_cut_front()

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Minor cleanup - prep work for new key types for reflink

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2019-07-18 17:21:21 -04:00 committed by Kent Overstreet
parent b17657d0cf
commit b1c9358a25
2 changed files with 30 additions and 26 deletions
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50
fs/bcachefs/extents.c
View File

@ -707,44 +707,47 @@ void bch2_btree_ptr_to_text(struct printbuf *out, struct bch_fs *c,
/* Extents */
bool __bch2_cut_front(struct bpos where, struct bkey_s k)
void __bch2_cut_front(struct bpos where, struct bkey_s k)
{
u64 len = 0;
u64 sub;
if (bkey_cmp(where, bkey_start_pos(k.k)) <= 0)
return false;
return;
EBUG_ON(bkey_cmp(where, k.k->p) > 0);
len = k.k->p.offset - where.offset;
sub = where.offset - bkey_start_offset(k.k);
BUG_ON(len > k.k->size);
k.k->size -= sub;
/*
* Don't readjust offset if the key size is now 0, because that could
* cause offset to point to the next bucket:
*/
if (!len)
if (!k.k->size)
k.k->type = KEY_TYPE_deleted;
else if (bkey_extent_is_data(k.k)) {
struct bkey_s_extent e = bkey_s_to_extent(k);
switch (k.k->type) {
case KEY_TYPE_deleted:
case KEY_TYPE_discard:
case KEY_TYPE_error:
case KEY_TYPE_cookie:
break;
case KEY_TYPE_extent: {
struct bkey_ptrs ptrs = bch2_bkey_ptrs(k);
union bch_extent_entry *entry;
bool seen_crc = false;
extent_for_each_entry(e, entry) {
bkey_extent_entry_for_each(ptrs, entry) {
switch (extent_entry_type(entry)) {
case BCH_EXTENT_ENTRY_ptr:
if (!seen_crc)
entry->ptr.offset += e.k->size - len;
entry->ptr.offset += sub;
break;
case BCH_EXTENT_ENTRY_crc32:
entry->crc32.offset += e.k->size - len;
entry->crc32.offset += sub;
break;
case BCH_EXTENT_ENTRY_crc64:
entry->crc64.offset += e.k->size - len;
entry->crc64.offset += sub;
break;
case BCH_EXTENT_ENTRY_crc128:
entry->crc128.offset += e.k->size - len;
entry->crc128.offset += sub;
break;
case BCH_EXTENT_ENTRY_stripe_ptr:
break;
@ -753,11 +756,14 @@ bool __bch2_cut_front(struct bpos where, struct bkey_s k)
if (extent_entry_is_crc(entry))
seen_crc = true;
}
break;
}
case KEY_TYPE_reservation:
break;
default:
BUG();
}
k.k->size = len;
return true;
}
bool bch2_cut_back(struct bpos where, struct bkey *k)
@ -771,8 +777,6 @@ bool bch2_cut_back(struct bpos where, struct bkey *k)
len = where.offset - bkey_start_offset(k);
BUG_ON(len > k->size);
k->p = where;
k->size = len;

6
fs/bcachefs/extents.h
View File

@ -540,11 +540,11 @@ do { \
} \
} while (0)
bool __bch2_cut_front(struct bpos, struct bkey_s);
void __bch2_cut_front(struct bpos, struct bkey_s);
static inline bool bch2_cut_front(struct bpos where, struct bkey_i *k)
static inline void bch2_cut_front(struct bpos where, struct bkey_i *k)
{
return __bch2_cut_front(where, bkey_i_to_s(k));
__bch2_cut_front(where, bkey_i_to_s(k));
}
bool bch2_cut_back(struct bpos, struct bkey *);