| commit | e5465795cac48233c9b606a7a419f4190a91851e | [log] [tgz] |
|---|---|---|
| author | Eric Biggers <ebiggers@google.com> | Wed May 24 18:05:29 2017 -0400 |
| committer | Theodore Ts'o <tytso@mit.edu> | Wed May 24 18:05:29 2017 -0400 |
| tree | 94f07f19cf0f86b5586989863069468862873708 | |
| parent | 624327f8794704c5066b11a52f9da6a09dce7f9a [diff] |
ext4: fix off-by-one error when writing back pages before dio read
The 'lend' argument of filemap_write_and_wait_range() is inclusive, so
we need to subtract 1 from pos + count.
Note that 'count' is guaranteed to be nonzero since
ext4_file_read_iter() returns early when given a 0 count.
Fixes: 16c54688592c ("ext4: Allow parallel DIO reads")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>