linux-stable/fs/iomap
Ritesh Harjani (IBM) a01b8f2252 iomap: Allocate ifs in ->write_begin() early
We dont need to allocate an ifs in ->write_begin() for writes where the
position and length completely overlap with the given folio.
Therefore, such cases are skipped.

Currently when the folio is uptodate, we only allocate ifs at writeback
time (in iomap_writepage_map()). This is ok until now, but when we are
going to add support for per-block dirty state bitmap in ifs, this
could cause some performance degradation. The reason is that if we don't
allocate ifs during ->write_begin(), then we will never mark the
necessary dirty bits in ->write_end() call. And we will have to mark all
the bits as dirty at the writeback time, that could cause the same write
amplification and performance problems as it is now.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2023-07-25 10:55:56 +05:30
..
buffered-io.c iomap: Allocate ifs in ->write_begin() early 2023-07-25 10:55:56 +05:30
direct-io.c - Yosry Ahmed brought back some cgroup v1 stats in OOM logs. 2023-06-28 10:28:11 -07:00
fiemap.c fs: Move many prototypes to pagemap.h 2022-03-21 12:59:02 -04:00
iter.c iomap: write iomap validity checks 2022-11-29 09:09:17 +11:00
Makefile iomap: build the block based code conditionally 2021-12-04 08:58:54 -08:00
seek.c iomap: switch iomap_seek_data to use iomap_iter 2021-08-16 21:26:33 -07:00
swapfile.c mm/swap: consider max pages in iomap_swapfile_add_extent 2021-08-18 12:47:52 -07:00
trace.c iomap: Add DIO tracepoints 2023-04-21 08:54:47 -07:00
trace.h iomap: Add DIO tracepoints 2023-04-21 08:54:47 -07:00