Commit 97535cd8 authored by Kent Overstreet's avatar Kent Overstreet
Browse files

bcachefs: Fix data corruption on -ENOSPC in buffered write path 



Found by generic/299: When we have to truncate a write due to -ENOSPC,
we may have to read in the folio we're writing to if we're now no longer
doing a complete write to a !uptodate folio.

Signed-off-by: default avatarKent Overstreet <kent.overstreet@linux.dev>
parent 335d318e

fs/bcachefs/fs-io-buffered.c

+6 −0
Original line number Diff line number Diff line
@@ -856,6 +856,12 @@ static int __bch2_buffered_write(struct bch_inode_info *inode, 
				folios_trunc(&fs, fi);

				end = min(end, folio_end_pos(darray_last(fs)));

			} else {

				if (!folio_test_uptodate(f)) {

					ret = bch2_read_single_folio(f, mapping);

					if (ret)

						goto out;

				}



				folios_trunc(&fs, fi + 1);

				end = f_pos + f_reserved;

			}