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| author |   Jing Xia <j.xia@samsung.com> | 2024-09-03 13:40:12 +0800 |
|---|---|---|
| committer |   David Sterba <dsterba@suse.com> | 2025-01-13 14:53:21 +0100 |
| commit | 2fa07d7a0f0084d9777f076a154ad10e759ba731 (patch) | |
| tree | 724a6ad3e6b856a10b5255eebc4fe0eae9f1bd7c | |
| parent | btrfs: print read policy on module load (diff) | |
| download | linux-rng-2fa07d7a0f0084d9777f076a154ad10e759ba731.tar.xz linux-rng-2fa07d7a0f0084d9777f076a154ad10e759ba731.zip | |
btrfs: pass write-hint for buffered IO
Commit 449813515d3e ("block, fs: Restore the per-bio/request data
lifetime fields") restored write-hint support in btrfs. But that is
applicable only for direct IO. This patch supports passing
write-hint for buffered IO from btrfs file system to block layer
by filling bi_write_hint of struct bio in alloc_new_bio().
There's an ongoing discussion which devices can use that,
https://lore.kernel.org/all/20240910150200.6589-6-joshi.k@samsung.com,
in SCSI there's support using sd_group_number() and
sd_setup_rw32_cmnd().
The hint goes from the application directly to the block device so it's
up to the application to set up everything properly to utilize the
different hint classes.
Link: https://lore.kernel.org/all/20240910150200.6589-6-joshi.k@samsung.com
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jing Xia <j.xia@samsung.com>
[ Add more context and use case. ]
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/extent_io.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 9725ff7f274d..74f2775db51e 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -710,6 +710,7 @@ static void alloc_new_bio(struct btrfs_inode *inode, bbio = btrfs_bio_alloc(BIO_MAX_VECS, bio_ctrl->opf, fs_info, bio_ctrl->end_io_func, NULL); bbio->bio.bi_iter.bi_sector = disk_bytenr >> SECTOR_SHIFT; + bbio->bio.bi_write_hint = inode->vfs_inode.i_write_hint; bbio->inode = inode; bbio->file_offset = file_offset; bio_ctrl->bbio = bbio; |