diff options
| author | Kemeng Shi <shikemeng@huaweicloud.com> | 2023-01-17 04:50:57 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-01-29 20:03:01 -0700 |
| commit | 08470a98a7d7e32c787b23b87353f13b03c23195 (patch) | |
| tree | 3c99054c6beb4d36b8923318a24976a81383f38a /lib | |
| parent | 903e86f3a64d9573352bbab2f211fdbbaa5772b7 (diff) | |
sbitmap: rewrite sbitmap_find_bit_in_index to reduce repeat code
Rewrite sbitmap_find_bit_in_index as following:
1. Rename sbitmap_find_bit_in_index to sbitmap_find_bit_in_word
2. Accept "struct sbitmap_word *" directly instead of accepting
"struct sbitmap *" and "int index" to get "struct sbitmap_word *".
3. Accept depth/shallow_depth and wrap for __sbitmap_get_word from caller
to support need of both __sbitmap_get_shallow and __sbitmap_get.
With helper function sbitmap_find_bit_in_word, we can remove repeat
code in __sbitmap_get_shallow to find bit considring deferred clear.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://lore.kernel.org/r/20230116205059.3821738-4-shikemeng@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/sbitmap.c | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/lib/sbitmap.c b/lib/sbitmap.c index eb45a2d7916e..27cfcc35956e 100644 --- a/lib/sbitmap.c +++ b/lib/sbitmap.c @@ -167,15 +167,16 @@ static int __sbitmap_get_word(unsigned long *word, unsigned long depth, return nr; } -static int sbitmap_find_bit_in_index(struct sbitmap *sb, int index, - unsigned int alloc_hint) +static int sbitmap_find_bit_in_word(struct sbitmap_word *map, + unsigned int depth, + unsigned int alloc_hint, + bool wrap) { - struct sbitmap_word *map = &sb->map[index]; int nr; do { - nr = __sbitmap_get_word(&map->word, __map_depth(sb, index), - alloc_hint, !sb->round_robin); + nr = __sbitmap_get_word(&map->word, depth, + alloc_hint, wrap); if (nr != -1) break; if (!sbitmap_deferred_clear(map)) @@ -203,7 +204,9 @@ static int __sbitmap_get(struct sbitmap *sb, unsigned int alloc_hint) alloc_hint = 0; for (i = 0; i < sb->map_nr; i++) { - nr = sbitmap_find_bit_in_index(sb, index, alloc_hint); + nr = sbitmap_find_bit_in_word(&sb->map[index], + __map_depth(sb, index), + alloc_hint, !sb->round_robin); if (nr != -1) { nr += index << sb->shift; break; @@ -246,20 +249,17 @@ static int __sbitmap_get_shallow(struct sbitmap *sb, alloc_hint = SB_NR_TO_BIT(sb, alloc_hint); for (i = 0; i < sb->map_nr; i++) { -again: - nr = __sbitmap_get_word(&sb->map[index].word, - min_t(unsigned int, - __map_depth(sb, index), - shallow_depth), - alloc_hint, true); + nr = sbitmap_find_bit_in_word(&sb->map[index], + min_t(unsigned int, + __map_depth(sb, index), + shallow_depth), + alloc_hint, true); + if (nr != -1) { nr += index << sb->shift; break; } - if (sbitmap_deferred_clear(&sb->map[index])) - goto again; - /* Jump to next index. */ alloc_hint = 0; if (++index >= sb->map_nr) |