| Message ID | 20240826170606.255718-2-joshi.k@samsung.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v4,1/5] fs, block: refactor enum rw_hint | expand |
On 8/26/24 10:06 AM, Kanchan Joshi wrote: > Change i_write_hint (in inode), bi_write_hint (in bio) and write_hint > (in request) to use u8 data-type rather than this enum. That sounds fishy to me. Why to increase the size of this enum? Why to reduce the ability of the compiler to perform type checking? I think this needs to be motivated clearly in the patch description. Bart.
On 8/26/2024 11:14 PM, Bart Van Assche wrote: > On 8/26/24 10:06 AM, Kanchan Joshi wrote: >> Change i_write_hint (in inode), bi_write_hint (in bio) and write_hint >> (in request) to use u8 data-type rather than this enum. > > That sounds fishy to me. Why to increase the size of this enum? Why to > reduce the ability of the compiler to perform type checking? I think > this needs to be motivated clearly in the patch description. Since inode/bio/request stopped using this, the __packed annotation did not seem to serve much purpose. But sure, I can retain the size/checks on the renamed enum (rw_life_hint) too. Motivation for keeping u8 in inode/bio/request is to represent another hint type. This is similar to ioprio where multiple io priority classes/values are expressed within an int type.
On 8/26/24 1:06 PM, Kanchan Joshi wrote: > /* Block storage write lifetime hint values. */ > -enum rw_hint { > +enum rw_life_hint { The name "rw_life_hint" seems confusing to me. I think that the name "rw_lifetime_hint" would be a better name. Thanks, Bart.
On 8/30/2024 5:47 PM, Bart Van Assche wrote: > On 8/26/24 1:06 PM, Kanchan Joshi wrote: >> /* Block storage write lifetime hint values. */ >> -enum rw_hint { >> +enum rw_life_hint { > > The name "rw_life_hint" seems confusing to me. I think that the > name "rw_lifetime_hint" would be a better name. > I can change to that in next iteration. This change needs to be consistent in all the places. But more important in patch #3 (as we expose TYPE_RW_LIFE_HINT to userspace). Do you have comments on the other parts?
diff --git a/fs/buffer.c b/fs/buffer.c index e55ad471c530..0c6bc9b7d4ad 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -55,7 +55,7 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list); static void submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh, - enum rw_hint hint, struct writeback_control *wbc); + u8 hint, struct writeback_control *wbc); #define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers) @@ -2778,7 +2778,7 @@ static void end_bio_bh_io_sync(struct bio *bio) } static void submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh, - enum rw_hint write_hint, + u8 write_hint, struct writeback_control *wbc) { const enum req_op op = opf & REQ_OP_MASK; diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index ac19c61f0c3e..b3022dc94a1f 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -3756,8 +3756,8 @@ int f2fs_build_segment_manager(struct f2fs_sb_info *sbi); void f2fs_destroy_segment_manager(struct f2fs_sb_info *sbi); int __init f2fs_create_segment_manager_caches(void); void f2fs_destroy_segment_manager_caches(void); -int f2fs_rw_hint_to_seg_type(struct f2fs_sb_info *sbi, enum rw_hint hint); -enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi, +int f2fs_rw_hint_to_seg_type(struct f2fs_sb_info *sbi, enum rw_life_hint hint); +enum rw_life_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi, enum page_type type, enum temp_type temp); unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi, unsigned int segno); diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 78c3198a6308..794050f4cdbf 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -3381,7 +3381,7 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range) return err; } -int f2fs_rw_hint_to_seg_type(struct f2fs_sb_info *sbi, enum rw_hint hint) +int f2fs_rw_hint_to_seg_type(struct f2fs_sb_info *sbi, enum rw_life_hint hint) { if (F2FS_OPTION(sbi).active_logs == 2) return CURSEG_HOT_DATA; @@ -3425,7 +3425,7 @@ int f2fs_rw_hint_to_seg_type(struct f2fs_sb_info *sbi, enum rw_hint hint) * WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM * WRITE_LIFE_LONG " WRITE_LIFE_LONG */ -enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi, +enum rw_life_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi, enum page_type type, enum temp_type temp) { switch (type) { diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 8d304b1d16b1..1e5ce84ccf0a 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -159,7 +159,7 @@ struct request { struct blk_crypto_keyslot *crypt_keyslot; #endif - enum rw_hint write_hint; + u8 write_hint; unsigned short ioprio; enum mq_rq_state state; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 36ed96133217..446c847bb3b3 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -216,7 +216,7 @@ struct bio { */ unsigned short bi_flags; /* BIO_* below */ unsigned short bi_ioprio; - enum rw_hint bi_write_hint; + u8 bi_write_hint; blk_status_t bi_status; atomic_t __bi_remaining; diff --git a/include/linux/fs.h b/include/linux/fs.h index fb0426f349fc..f9a7a2a80661 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -674,7 +674,7 @@ struct inode { spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ unsigned short i_bytes; u8 i_blkbits; - enum rw_hint i_write_hint; + u8 i_write_hint; blkcnt_t i_blocks; #ifdef __NEED_I_SIZE_ORDERED diff --git a/include/linux/rw_hint.h b/include/linux/rw_hint.h index 309ca72f2dfb..e17fd9fa65d4 100644 --- a/include/linux/rw_hint.h +++ b/include/linux/rw_hint.h @@ -7,18 +7,13 @@ #include <uapi/linux/fcntl.h> /* Block storage write lifetime hint values. */ -enum rw_hint { +enum rw_life_hint { WRITE_LIFE_NOT_SET = RWH_WRITE_LIFE_NOT_SET, WRITE_LIFE_NONE = RWH_WRITE_LIFE_NONE, WRITE_LIFE_SHORT = RWH_WRITE_LIFE_SHORT, WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM, WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG, WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, -} __packed; - -/* Sparse ignores __packed annotations on enums, hence the #ifndef below. */ -#ifndef __CHECKER__ -static_assert(sizeof(enum rw_hint) == 1); -#endif +}; #endif /* _LINUX_RW_HINT_H */
Rename enum rw_hint to rw_life_hint. Change i_write_hint (in inode), bi_write_hint (in bio) and write_hint (in request) to use u8 data-type rather than this enum. This is in preparation to introduce a new write hint type. Signed-off-by: Kanchan Joshi <joshi.k@samsung.com> --- fs/buffer.c | 4 ++-- fs/f2fs/f2fs.h | 4 ++-- fs/f2fs/segment.c | 4 ++-- include/linux/blk-mq.h | 2 +- include/linux/blk_types.h | 2 +- include/linux/fs.h | 2 +- include/linux/rw_hint.h | 9 ++------- 7 files changed, 11 insertions(+), 16 deletions(-)