[PATCH v2 32/35] omfs: Use kmemdup rather than duplicating its implementation

[PATCH v2 32/35] omfs: Use kmemdup rather than duplicating its implementation

[Fuqian Huang]

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
---
Changes in v2:
  - Fix a typo in commit message (memset -> memcpy)

 fs/omfs/inode.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c
index 08226a835ec3..1aa0c0a224b1 100644
--- a/fs/omfs/inode.c
+++ b/fs/omfs/inode.c
@@ -363,12 +363,11 @@ static int omfs_get_imap(struct super_block *sb)
 		bh = sb_bread(sb, block++);
 		if (!bh)
 			goto nomem_free;
-		*ptr = kmalloc(sb->s_blocksize, GFP_KERNEL);
+		*ptr = kmemdup(bh->b_data, sb->s_blocksize, GFP_KERNEL);
 		if (!*ptr) {
 			brelse(bh);
 			goto nomem_free;
 		}
-		memcpy(*ptr, bh->b_data, sb->s_blocksize);
 		if (count < sb->s_blocksize)
 			memset((void *)*ptr + count, 0xff,
 				sb->s_blocksize - count);
-- 
2.11.0

Re: [PATCH v2 32/35] omfs: Use kmemdup rather than duplicating its implementation

[Bob Copeland]

On Thu, Jul 04, 2019 at 12:31:58AM +0800, Fuqian Huang wrote:
> kmemdup is introduced to duplicate a region of memory in a neat way.
> Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
> write the size twice (sometimes lead to mistakes), kmemdup improves
> readability, leads to smaller code and also reduce the chances of mistakes.
> Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Acked-by: Bob Copeland <me@bobcopeland.com>

-- 
Bob Copeland %% https://bobcopeland.com/