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bcachefs: folio pos to bch_folio_sector index helper

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Create a small helper to translate from file offset to the
associated bch_folio_sector index in the underlying bch_folio. The
helper assumes the file offset is covered by the passed folio.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Brian Foster 2023-04-03 08:17:26 -04:00 committed by Kent Overstreet
parent e3dc75eb55
commit bf98ee10d4
1 changed files with 17 additions and 11 deletions
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28
fs/bcachefs/fs-io.c
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@ -528,6 +528,14 @@ static inline void folio_sector_set(struct folio *folio,
s->s[i].state = n;
}
/* file offset (to folio offset) to bch_folio_sector index */
static inline int folio_pos_to_s(struct folio *folio, loff_t pos)
{
u64 f_offset = pos - folio_pos(folio);
BUG_ON(pos < folio_pos(folio) || pos >= folio_end_pos(folio));
return f_offset >> SECTOR_SHIFT;
}
static inline struct bch_folio *__bch2_folio(struct folio *folio)
{
return folio_has_private(folio)
@ -2902,7 +2910,7 @@ static int __bch2_truncate_folio(struct bch_inode_info *inode,
end_pos = folio_end_pos(folio);
if (inode->v.i_size > folio_pos(folio))
end_pos = min_t(u64, inode->v.i_size, end_pos);
ret = s->s[(end_pos - folio_pos(folio) - 1) >> 9].state >= SECTOR_dirty;
ret = s->s[folio_pos_to_s(folio, end_pos - 1)].state >= SECTOR_dirty;
folio_zero_segment(folio, start_offset, end_offset);
@ -3653,15 +3661,15 @@ err:
/* fseek: */
static int folio_data_offset(struct folio *folio, unsigned offset)
static int folio_data_offset(struct folio *folio, loff_t pos)
{
struct bch_folio *s = bch2_folio(folio);
unsigned i, sectors = folio_sectors(folio);
if (s)
for (i = offset >> 9; i < sectors; i++)
for (i = folio_pos_to_s(folio, pos); i < sectors; i++)
if (s->s[i].state >= SECTOR_dirty)
return i << 9;
return i << SECTOR_SHIFT;
return -1;
}
@ -3687,8 +3695,7 @@ static loff_t bch2_seek_pagecache_data(struct inode *vinode,
folio_lock(folio);
offset = folio_data_offset(folio,
max(folio_pos(folio), start_offset) -
folio_pos(folio));
max(folio_pos(folio), start_offset));
if (offset >= 0) {
ret = clamp(folio_pos(folio) + offset,
start_offset, end_offset);
@ -3762,7 +3769,7 @@ static bool folio_hole_offset(struct address_space *mapping, loff_t *offset)
{
struct folio *folio;
struct bch_folio *s;
unsigned i, sectors, f_offset;
unsigned i, sectors;
bool ret = true;
folio = filemap_lock_folio(mapping, *offset >> PAGE_SHIFT);
@ -3774,11 +3781,10 @@ static bool folio_hole_offset(struct address_space *mapping, loff_t *offset)
goto unlock;
sectors = folio_sectors(folio);
f_offset = *offset - folio_pos(folio);
for (i = f_offset >> 9; i < sectors; i++)
for (i = folio_pos_to_s(folio, *offset); i < sectors; i++)
if (s->s[i].state < SECTOR_dirty) {
*offset = max(*offset, folio_pos(folio) + (i << 9));
*offset = max(*offset,
folio_pos(folio) + (i << SECTOR_SHIFT));
goto unlock;
}