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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2024-04-12 01:07:29 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2024-05-02 19:50:11 -0400 |
| commit | 1116b9fa15c09748ae05d2365a305fa22671eb1e (patch) | |
| tree | 0d380782b6d3aadc770d758ef956887f028423fa /include/linux/blk_types.h | |
| parent | wrapper for access to ->bd_partno (diff) | |
| download | wireguard-linux-1116b9fa15c09748ae05d2365a305fa22671eb1e.tar.xz wireguard-linux-1116b9fa15c09748ae05d2365a305fa22671eb1e.zip | |
bdev: infrastructure for flags
Replace bd_partno with a 32bit field (__bd_flags). The lower 8 bits
contain the partition number, the upper 24 are for flags.
Helpers: bdev_{test,set,clear}_flag(bdev, flag), with atomic_or()
and atomic_andnot() used to set/clear.
NOTE: this commit does not actually move any flags over there - they
are still bool fields. As the result, it shifts the fields wrt
cacheline boundaries; that's going to be restored once the first
3 flags are dealt with.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/blk_types.h')
| -rw-r--r-- | include/linux/blk_types.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index cb1526ec44b5..04f92737ab08 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -45,8 +45,9 @@ struct block_device { struct request_queue * bd_queue; struct disk_stats __percpu *bd_stats; unsigned long bd_stamp; + atomic_t __bd_flags; // partition number + flags +#define BD_PARTNO 255 // lower 8 bits; assign-once bool bd_read_only; /* read-only policy */ - u8 bd_partno; bool bd_write_holder; bool bd_has_submit_bio; dev_t bd_dev; |