From afb0675c54fa0c2407845257b5b46e35e7311818 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 8 Jun 2017 18:15:18 -0400 Subject: [PATCH] fix ufs_isblockset() commit 414cf7186dbec29bd946c138d6b5c09da5955a08 upstream. Signed-off-by: Al Viro Signed-off-by: Ben Hutchings --- fs/ufs/util.h | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/ufs/util.h b/fs/ufs/util.h index 954175928240..3f9463f8cf2f 100644 --- a/fs/ufs/util.h +++ b/fs/ufs/util.h @@ -473,15 +473,19 @@ static inline unsigned _ubh_find_last_zero_bit_( static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, unsigned begin, unsigned block) { + u8 mask; switch (uspi->s_fpb) { case 8: return (*ubh_get_addr (ubh, begin + block) == 0xff); case 4: - return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2))); + mask = 0x0f << ((block & 0x01) << 2); + return (*ubh_get_addr (ubh, begin + (block >> 1)) & mask) == mask; case 2: - return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1))); + mask = 0x03 << ((block & 0x03) << 1); + return (*ubh_get_addr (ubh, begin + (block >> 2)) & mask) == mask; case 1: - return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07))); + mask = 0x01 << (block & 0x07); + return (*ubh_get_addr (ubh, begin + (block >> 3)) & mask) == mask; } return 0; } -- 2.39.2