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| author | Yuezhang Mo <Yuezhang.Mo@sony.com> | 2022-08-16 11:55:06 +0300 |
|---|---|---|
| committer | Namjae Jeon <linkinjeon@kernel.org> | 2022-12-12 05:02:50 +0300 |
| commit | 088f1343d9108c16fca064951d85e6de9f5cab42 (patch) | |
| tree | e389ed08eea7514f261cbb47d2c498f102113552 /fs/exfat | |
| parent | f3fe3954c09f97d8227d9d2edc807796a8b228ab (diff) | |
| download | linux-088f1343d9108c16fca064951d85e6de9f5cab42.tar.xz | |
exfat: remove call ilog2() from exfat_readdir()
There is no need to call ilog2() for the conversions between
cluster and dentry in exfat_readdir(), because these conversions
can be replaced with EXFAT_DEN_TO_CLU()/EXFAT_CLU_TO_DEN().
Code refinement, no functional changes.
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Andy Wu <Andy.Wu@sony.com>
Reviewed-by: Aoyama Wataru <wataru.aoyama@sony.com>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Diffstat (limited to 'fs/exfat')
| -rw-r--r-- | fs/exfat/dir.c | 9 | ||||
| -rw-r--r-- | fs/exfat/exfat_fs.h | 10 |
2 files changed, 12 insertions, 7 deletions
diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c index c05493fc9124..397ea2d98848 100644 --- a/fs/exfat/dir.c +++ b/fs/exfat/dir.c @@ -61,7 +61,7 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb, /* read a directory entry from the opened directory */ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry) { - int i, dentries_per_clu, dentries_per_clu_bits = 0, num_ext; + int i, dentries_per_clu, num_ext; unsigned int type, clu_offset, max_dentries; struct exfat_chain dir, clu; struct exfat_uni_name uni_name; @@ -83,11 +83,10 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); dentries_per_clu = sbi->dentries_per_clu; - dentries_per_clu_bits = ilog2(dentries_per_clu); max_dentries = (unsigned int)min_t(u64, MAX_EXFAT_DENTRIES, - (u64)sbi->num_clusters << dentries_per_clu_bits); + (u64)EXFAT_CLU_TO_DEN(sbi->num_clusters, sbi)); - clu_offset = dentry >> dentries_per_clu_bits; + clu_offset = EXFAT_DEN_TO_CLU(dentry, sbi); exfat_chain_dup(&clu, &dir); if (clu.flags == ALLOC_NO_FAT_CHAIN) { @@ -162,7 +161,7 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent dir_entry->entry = dentry; brelse(bh); - ei->hint_bmap.off = dentry >> dentries_per_clu_bits; + ei->hint_bmap.off = EXFAT_DEN_TO_CLU(dentry, sbi); ei->hint_bmap.clu = clu.dir; *cpos = EXFAT_DEN_TO_B(dentry + 1 + num_ext); diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h index 324acc57d029..37e8af8042aa 100644 --- a/fs/exfat/exfat_fs.h +++ b/fs/exfat/exfat_fs.h @@ -101,12 +101,18 @@ enum { /* * helpers for block size to dentry size conversion. */ -#define EXFAT_B_TO_DEN_IDX(b, sbi) \ - ((b) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) #define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS) #define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS) /* + * helpers for cluster size to dentry size conversion. + */ +#define EXFAT_CLU_TO_DEN(clu, sbi) \ + ((clu) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) +#define EXFAT_DEN_TO_CLU(dentry, sbi) \ + ((dentry) >> ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) + +/* * helpers for fat entry. */ #define FAT_ENT_SIZE (4) |