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bcachefs: filemap_get_contig_folios_d()

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Add a new helper for getting a range of contiguous folios and returning
them in a darray.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2023-03-23 12:51:47 -04:00
parent a1774a0564
commit 40022c0115
1 changed files with 44 additions and 28 deletions
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72
fs/bcachefs/fs-io.c
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@@ -55,6 +55,41 @@ static inline loff_t folio_end_sector(struct folio *folio)
return folio_end_pos(folio) >> 9;
}
typedef DARRAY(struct folio *) folios;
static int filemap_get_contig_folios_d(struct address_space *mapping,
loff_t start, loff_t end,
int fgp_flags, gfp_t gfp,
folios *folios)
{
struct folio *f;
loff_t pos = start;
int ret = 0;
while (pos < end) {
if ((u64) pos >= (u64) start + (1ULL << 20))
fgp_flags &= ~FGP_CREAT;
ret = darray_make_room_gfp(folios, 1, gfp & GFP_KERNEL);
if (ret)
break;
f = __filemap_get_folio(mapping, pos >> PAGE_SHIFT, fgp_flags, gfp);
if (!f)
break;
BUG_ON(folios->nr && folio_pos(f) != pos);
pos = folio_end_pos(f);
darray_push(folios, f);
}
if (!folios->nr && !ret && (fgp_flags & FGP_CREAT))
ret = -ENOMEM;
return folios->nr ? 0 : ret;
}
struct nocow_flush {
struct closure *cl;
struct bch_dev *ca;
@@ -1754,8 +1789,6 @@ int bch2_write_end(struct file *file, struct address_space *mapping,
return copied;
}
typedef DARRAY(struct folio *) folios;
static noinline void folios_trunc(folios *folios, struct folio **fi)
{
while (folios->data + folios->nr > fi) {
@@ -1784,33 +1817,16 @@ static int __bch2_buffered_write(struct bch_inode_info *inode,
bch2_folio_reservation_init(c, inode, &res);
darray_init(&folios);
f_pos = pos;
while (f_pos < end) {
unsigned fgp_flags = FGP_LOCK|FGP_WRITE|FGP_STABLE;
if ((u64) f_pos < (u64) pos + (1U << 20))
fgp_flags |= FGP_CREAT;
if (darray_make_room_gfp(&folios, 1,
mapping_gfp_mask(mapping) & GFP_KERNEL))
break;
f = __filemap_get_folio(mapping, f_pos >> PAGE_SHIFT,
fgp_flags, mapping_gfp_mask(mapping));
if (!f)
break;
BUG_ON(folios.nr && folio_pos(f) != f_pos);
f_pos = folio_end_pos(f);
darray_push(&folios, f);
}
end = min(end, f_pos);
if (end == pos) {
ret = -ENOMEM;
ret = filemap_get_contig_folios_d(mapping, pos, end,
FGP_LOCK|FGP_WRITE|FGP_STABLE|FGP_CREAT,
mapping_gfp_mask(mapping),
&folios);
if (ret)
goto out;
}
BUG_ON(!folios.nr);
end = min(end, folio_end_pos(darray_last(folios)));
f = darray_first(folios);
if (pos != folio_pos(f) && !folio_test_uptodate(f)) {