| Message ID | cover.1656934419.git.fdmanana@suse.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | btrfs: a few direct IO fixes/improvements | expand |
On Mon, Jul 04, 2022 at 12:42:02PM +0100, fdmanana@kernel.org wrote: > From: Filipe Manana <fdmanana@suse.com> > > Several fixes and improvements regarding direct IO, with the first one being > recently reported by Dominique when using qemu with io_uring on images that > have a mix of compressed and non-compressed extents. That in particular > exposed a bug in qemu's handling of partial reads, fixed recently by > Dominique, but despite that we could avoid returning a partial read when > there's really no need to, not just for efficiency but also because many > applications don't take into consideration partial reads (MariaDB for > example didn't use to until recently) or are buggy dealing with them. > More details in the changelogs. > > Filipe Manana (3): > btrfs: return -EAGAIN for NOWAIT dio reads/writes on compressed and > inline extents > btrfs: don't fallback to buffered IO for NOWAIT direct IO writes > btrfs: fault in pages for dio reads/writes in a more controlled way The first patch was already in misc-next, I've compared the code and briefly the changelog and it looked exactly the same so I've kept the patch, 2 and 3 added to misc-next. Thanks.
From: Filipe Manana <fdmanana@suse.com> Several fixes and improvements regarding direct IO, with the first one being recently reported by Dominique when using qemu with io_uring on images that have a mix of compressed and non-compressed extents. That in particular exposed a bug in qemu's handling of partial reads, fixed recently by Dominique, but despite that we could avoid returning a partial read when there's really no need to, not just for efficiency but also because many applications don't take into consideration partial reads (MariaDB for example didn't use to until recently) or are buggy dealing with them. More details in the changelogs. Filipe Manana (3): btrfs: return -EAGAIN for NOWAIT dio reads/writes on compressed and inline extents btrfs: don't fallback to buffered IO for NOWAIT direct IO writes btrfs: fault in pages for dio reads/writes in a more controlled way fs/btrfs/file.c | 72 ++++++++++++++++++++++++++++++++++++------------ fs/btrfs/inode.c | 14 +++++++++- 2 files changed, 68 insertions(+), 18 deletions(-)