[PATCH v2 0/3] Add dirty range scoping to jbd2

[Ross Zwisler]

Changes from v1:
 - Relocated the code which resets dirty range upon transaction completion.
   (Jan)
 - Cc'd stable@xxxxxxxxxxxxxxx because we see this issue with v4.14 and
   v4.19 stable kernels in the field.

---

This patch series fixes the issue I described here:

https://www.spinics.net/lists/linux-block/msg38274.html

Essentially the issue is that journal_finish_inode_data_buffers() operates
on the entire address space of each of the inodes associated with a given
journal entry.  This means that if we have an inode where we are constantly
appending dirty pages we can end up waiting for an indefinite amount of
time in journal_finish_inode_data_buffers().

This series improves this situation in ext4 by scoping each of the inode
dirty ranges associated with a given transaction.  Other users of jbd2
which don't (yet?) take advantage of this scoping (ocfs2) will continue to
have the old behavior.

Ross Zwisler (3):
  mm: add filemap_fdatawait_range_keep_errors()
  jbd2: introduce jbd2_inode dirty range scoping
  ext4: use jbd2_inode dirty range scoping

 fs/ext4/ext4_jbd2.h   | 12 +++++------
 fs/ext4/inode.c       | 13 +++++++++---
 fs/ext4/move_extent.c |  3 ++-
 fs/jbd2/commit.c      | 23 ++++++++++++++------
 fs/jbd2/journal.c     |  2 ++
 fs/jbd2/transaction.c | 49 ++++++++++++++++++++++++-------------------
 include/linux/fs.h    |  2 ++
 include/linux/jbd2.h  | 22 +++++++++++++++++++
 mm/filemap.c          | 22 +++++++++++++++++++
 9 files changed, 111 insertions(+), 37 deletions(-)

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2.22.0.410.gd8fdbe21b5-goog