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bcachefs: bch2_seek_pagecache_hole() folio conversion

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This converts bch2_seek_pagecache_hole() to handle large folios.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-03-19 19:06:42 -04:00
parent ff9c301f28
commit e8d28c3e47
1 changed files with 27 additions and 35 deletions
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62
fs/bcachefs/fs-io.c
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@ -3592,37 +3592,34 @@ static loff_t bch2_seek_data(struct file *file, u64 offset)
return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
}
static int __folio_hole_offset(struct folio *folio, unsigned offset)
static bool folio_hole_offset(struct address_space *mapping, loff_t *offset)
{
struct bch_folio *s = bch2_folio(folio);
unsigned i;
if (!s)
return 0;
for (i = offset >> 9; i < PAGE_SECTORS; i++)
if (s->s[i].state < SECTOR_DIRTY)
return i << 9;
return -1;
}
static loff_t folio_hole_offset(struct address_space *mapping, loff_t offset)
{
pgoff_t index = offset >> PAGE_SHIFT;
struct folio *folio;
int folio_offset;
loff_t ret = -1;
struct bch_folio *s;
unsigned i, sectors, f_offset;
bool ret = true;
folio = filemap_lock_folio(mapping, index);
folio = filemap_lock_folio(mapping, *offset >> PAGE_SHIFT);
if (!folio)
return offset;
return true;
folio_offset = __folio_hole_offset(folio, offset & (folio_size(folio) - 1));
if (folio_offset >= 0)
ret = folio_pos(folio) + folio_offset;
s = bch2_folio(folio);
if (!s)
goto unlock;
sectors = folio_sectors(folio);
f_offset = *offset - folio_pos(folio);
for (i = f_offset >> 9; i < sectors; i++)
if (s->s[i].state < SECTOR_DIRTY) {
*offset = max(*offset, folio_pos(folio) + (i << 9));
goto unlock;
}
*offset = folio_end_pos(folio);
ret = false;
unlock:
folio_unlock(folio);
return ret;
}
@ -3631,18 +3628,13 @@ static loff_t bch2_seek_pagecache_hole(struct inode *vinode,
loff_t end_offset)
{
struct address_space *mapping = vinode->i_mapping;
loff_t offset = start_offset, hole;
loff_t offset = start_offset;
while (offset < end_offset) {
hole = folio_hole_offset(mapping, offset);
if (hole >= 0 && hole <= end_offset)
return max(start_offset, hole);
while (offset < end_offset &&
!folio_hole_offset(mapping, &offset))
;
offset += PAGE_SIZE;
offset &= PAGE_MASK;
}
return end_offset;
return min(offset, end_offset);
}
static loff_t bch2_seek_hole(struct file *file, u64 offset)