From: Ojaswin Mujoo Date: Wed, 1 Nov 2023 16:38:10 +0000 (+0530) Subject: ext4: treat end of range as exclusive in ext4_zero_range() X-Git-Tag: ceph-for-6.8-rc2~142^2~11 X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=92573369144f40397e8514440afdf59f24905b40;p=ceph-client.git ext4: treat end of range as exclusive in ext4_zero_range() The call to filemap_write_and_wait_range() assumes the range passed to be inclusive, so fix the call to make sure we follow that. Signed-off-by: Ojaswin Mujoo Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/e503107a7c73a2b68dec645c5ad798c437717c45.1698856309.git.ojaswin@linux.ibm.com Signed-off-by: Theodore Ts'o --- diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index d5efe076d3d3f..01299b55a567a 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4523,7 +4523,8 @@ static long ext4_zero_range(struct file *file, loff_t offset, * Round up offset. This is not fallocate, we need to zero out * blocks, so convert interior block aligned part of the range to * unwritten and possibly manually zero out unaligned parts of the - * range. + * range. Here, start and partial_begin are inclusive, end and + * partial_end are exclusive. */ start = round_up(offset, 1 << blkbits); end = round_down((offset + len), 1 << blkbits); @@ -4609,7 +4610,8 @@ static long ext4_zero_range(struct file *file, loff_t offset, * disk in case of crash before zeroing trans is committed. */ if (ext4_should_journal_data(inode)) { - ret = filemap_write_and_wait_range(mapping, start, end); + ret = filemap_write_and_wait_range(mapping, start, + end - 1); if (ret) { filemap_invalidate_unlock(mapping); goto out_mutex;