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staging: erofs: avoid magic constants when initializing clusterbits

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Currently erofs only supports clustersize == blocksize.
and clustersize == 2^n * blocksize will be supported in the future.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2018-09-18 22:27:26 +08:00 committed by Greg Kroah-Hartman
parent 1e05ff36e6
commit 6bec52047f
1 changed files with 3 additions and 2 deletions
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5
drivers/staging/erofs/super.c
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@ -116,9 +116,10 @@ static int superblock_read(struct super_block *sb)
#endif
sbi->islotbits = ffs(sizeof(struct erofs_inode_v1)) - 1;
#ifdef CONFIG_EROFS_FS_ZIP
sbi->clusterbits = 12;
/* TODO: clusterbits should be related to inode */
sbi->clusterbits = blkszbits;
if (1 << (sbi->clusterbits - 12) > Z_EROFS_CLUSTER_MAX_PAGES)
if (1 << (sbi->clusterbits - PAGE_SHIFT) > Z_EROFS_CLUSTER_MAX_PAGES)
errln("clusterbits %u is not supported on this kernel",
sbi->clusterbits);
#endif