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iomap: remove pos+len BUG_ON() to after folio lookup 

The bug checks at the top of iomap_write_begin() assume the pos/len
reflect exactly the next range to process. This may no longer be the
case once the get folio path is able to process a folio batch from
the filesystem. On top of that, len is already trimmed to within the
iomap/srcmap by iomap_length(), so these checks aren't terribly
useful. Remove the unnecessary BUG_ON() checks.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Brian Foster 2025-10-03 09:46:36 -04:00 committed by Christian Brauner
parent f8d98072fe
commit 49590716be
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 1 additions and 4 deletions
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5
fs/iomap/buffered-io.c
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@ -826,15 +826,12 @@ static int iomap_write_begin(struct iomap_iter *iter,
size_t *poffset, u64 *plen)
{
const struct iomap *srcmap = iomap_iter_srcmap(iter);
loff_t pos = iter->pos;
loff_t pos;
u64 len = min_t(u64, SIZE_MAX, iomap_length(iter));
struct folio *folio;
int status = 0;
len = min_not_zero(len, *plen);
BUG_ON(pos + len > iter->iomap.offset + iter->iomap.length);
if (srcmap != &iter->iomap)
BUG_ON(pos + len > srcmap->offset + srcmap->length);
if (fatal_signal_pending(current))
return -EINTR;