From ac5cebeed61351c0a60c65bd20c70120469c46ff Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 15 Apr 2024 14:54:12 -0700 Subject: [PATCH] xfs: refactor non-power-of-two alignment checks Create a helper function that can compute if a 64-bit number is an integer multiple of a 32-bit number, where the 32-bit number is not required to be an even power of two. This is needed for some new code for the realtime device, where we can set 37k allocation units and then have to remap them. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_file.c | 12 +++--------- fs/xfs/xfs_linux.h | 5 +++++ 2 files changed, 8 insertions(+), 9 deletions(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 64278f8acaee..d1d4158441bd 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -47,15 +47,9 @@ xfs_is_falloc_aligned( { unsigned int alloc_unit = xfs_inode_alloc_unitsize(ip); - if (!is_power_of_2(alloc_unit)) { - u32 mod; - - div_u64_rem(pos, alloc_unit, &mod); - if (mod) - return false; - div_u64_rem(len, alloc_unit, &mod); - return mod == 0; - } + if (!is_power_of_2(alloc_unit)) + return isaligned_64(pos, alloc_unit) && + isaligned_64(len, alloc_unit); return !((pos | len) & (alloc_unit - 1)); } diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h index 8f07c9f6157f..ac355328121a 100644 --- a/fs/xfs/xfs_linux.h +++ b/fs/xfs/xfs_linux.h @@ -198,6 +198,11 @@ static inline uint64_t howmany_64(uint64_t x, uint32_t y) return x; } +static inline bool isaligned_64(uint64_t x, uint32_t y) +{ + return do_div(x, y) == 0; +} + /* If @b is a power of 2, return log2(b). Else return -1. */ static inline int8_t log2_if_power2(unsigned long b) {