Re: [PATCH] remove superfluous inode superblock check from shmem_mmap

From: Hugh Dickins (
Date: Sun Jun 15 2003 - 12:44:26 EST

On Mon, 16 Jun 2003, James Morris wrote:
> This patch against current 2.5 bk removes a (now) unecessary check for an
> inode superblock in shmem_mmap(). In the current kernel, all inodes must
> be associated with a superblock.

Thanks, looks good to me. I don't believe an inode with NULL i_sb
could ever have got to shmem_mmap - it's just a check copied over
from an old generic_file_mmap.

Andrew, please apply: thank you.

diff -purN -X dontdiff bk.pending/mm/shmem.c bk.w1/mm/shmem.c
--- bk.pending/mm/shmem.c 2003-06-16 00:56:13.000000000 +1000
+++ bk.w1/mm/shmem.c 2003-06-16 02:06:55.142303751 +1000
@@ -1010,7 +1010,7 @@ static int shmem_mmap(struct file *file,
         struct inode *inode = file->f_dentry->d_inode;
         ops = &shmem_vm_ops;
- if (!inode->i_sb || !S_ISREG(inode->i_mode))
+ if (!S_ISREG(inode->i_mode))
                 return -EACCES;
         vma->vm_ops = ops;

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