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bcachefs: Fix swallowing of data in buffered write path

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In __bch2_buffered_write, if we fail to write to an entire !uptodate
folio, we have to back out the write, bail out and retry.

But we were missing an iov_iter_revert() call, so the data written to
the folio was lost and the rest of the write shifted to the wrong
offset.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-08-14 22:29:41 -04:00
parent 8c9b0f7bdc
commit 62898dd12b
1 changed files with 1 additions and 0 deletions
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fs/bcachefs/fs-io-buffered.c
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@ -909,6 +909,7 @@ static int __bch2_buffered_write(struct bch_inode_info *inode,
if (!folio_test_uptodate(f) &&
f_copied != folio_size(f) &&
pos + copied + f_copied < inode->v.i_size) {
iov_iter_revert(iter, f_copied);
folio_zero_range(f, 0, folio_size(f));
folios_trunc(&folios, fi);
break;