On 7/20/23 16:04, Christoph Hellwig wrote:
Add a new config option that controls building the buffer_head code, and
select it from all file systems and stacking drivers that need it.
For the block device nodes and alternative iomap based buffered I/O path
is provided when buffer_head support is not enabled, and iomap needs a
little tweak to be able to compile out the buffer_head based code path.
Otherwise this is just Kconfig and ifdef changes.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/fops.c | 71 +++++++++++++++++++++++++++++++-----
drivers/md/Kconfig | 1 +
fs/Kconfig | 4 ++
fs/Makefile | 2 +-
fs/adfs/Kconfig | 1 +
fs/affs/Kconfig | 1 +
fs/befs/Kconfig | 1 +
fs/bfs/Kconfig | 1 +
fs/efs/Kconfig | 1 +
fs/exfat/Kconfig | 1 +
fs/ext2/Kconfig | 1 +
fs/ext4/Kconfig | 1 +
fs/f2fs/Kconfig | 1 +
fs/fat/Kconfig | 1 +
fs/freevxfs/Kconfig | 1 +
fs/gfs2/Kconfig | 1 +
fs/hfs/Kconfig | 1 +
fs/hfsplus/Kconfig | 1 +
fs/hpfs/Kconfig | 1 +
fs/iomap/buffered-io.c | 12 ++++--
fs/isofs/Kconfig | 1 +
fs/jfs/Kconfig | 1 +
fs/minix/Kconfig | 1 +
fs/nilfs2/Kconfig | 1 +
fs/ntfs/Kconfig | 1 +
fs/ntfs3/Kconfig | 1 +
fs/ocfs2/Kconfig | 1 +
fs/omfs/Kconfig | 1 +
fs/qnx4/Kconfig | 1 +
fs/qnx6/Kconfig | 1 +
fs/reiserfs/Kconfig | 1 +
fs/sysv/Kconfig | 1 +
fs/udf/Kconfig | 1 +
fs/ufs/Kconfig | 1 +
include/linux/buffer_head.h | 32 ++++++++--------
include/trace/events/block.h | 2 +
mm/migrate.c | 4 +-
37 files changed, 125 insertions(+), 32 deletions(-)
Hmm.
I actually have a patchset which _does_ allow for large I/O blocksizes
with buffer_heads. (And even ltp/fsx is happy on xfs...)
Can we modify this to not have a compile-time option but rather a
setting somewhere? EG kernel option or flag in struct address_space?
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
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