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authorKemeng Shi <shikemeng@huaweicloud.com>2023-01-16 23:50:57 +0300
committerJens Axboe <axboe@kernel.dk>2023-01-30 06:03:01 +0300
commit08470a98a7d7e32c787b23b87353f13b03c23195 (patch)
tree3c99054c6beb4d36b8923318a24976a81383f38a /lib/sbitmap.c
parent903e86f3a64d9573352bbab2f211fdbbaa5772b7 (diff)
downloadlinux-08470a98a7d7e32c787b23b87353f13b03c23195.tar.xz
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/sbitmap.c')
-rw-r--r--lib/sbitmap.c30
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)