linux-kernel - Re: [PATCH v3 26/30] mm: shmem: use SHMEM_F_* flags instead of VM

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Message-ID: <20250811231107.GA2328988.vipinsh@google.com>
Date: Mon, 11 Aug 2025 16:11:07 -0700
From: Vipin Sharma <vipinsh@...gle.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [PATCH v3 26/30] mm: shmem: use SHMEM_F_* flags instead of VM_*
 flags

On 2025-08-07 01:44:32, Pasha Tatashin wrote:
> From: Pratyush Yadav <ptyadav@...zon.de>
> @@ -3123,7 +3123,9 @@ static struct inode *__shmem_get_inode(struct mnt_idmap *idmap,
>  	spin_lock_init(&info->lock);
>  	atomic_set(&info->stop_eviction, 0);
>  	info->seals = F_SEAL_SEAL;
> -	info->flags = flags & VM_NORESERVE;
> +	info->flags = 0;

This is not needed as the 'info' is being set to 0 just above
spin_lock_init.

> +	if (flags & VM_NORESERVE)
> +		info->flags |= SHMEM_F_NORESERVE;

As info->flags will be 0, this can be just direct assignment '='.

>  	info->i_crtime = inode_get_mtime(inode);
>  	info->fsflags = (dir == NULL) ? 0 :
>  		SHMEM_I(dir)->fsflags & SHMEM_FL_INHERITED;
> @@ -5862,8 +5864,10 @@ static inline struct inode *shmem_get_inode(struct mnt_idmap *idmap,
>  /* common code */
>  
>  static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name,
> -			loff_t size, unsigned long flags, unsigned int i_flags)
> +				       loff_t size, unsigned long vm_flags,
> +				       unsigned int i_flags)

Nit: Might be just my editor, but this alignment seems off.

>  {
> +	unsigned long flags = (vm_flags & VM_NORESERVE) ? SHMEM_F_NORESERVE : 0;
>  	struct inode *inode;
>  	struct file *res;
>  
> @@ -5880,7 +5884,7 @@ static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name,
>  		return ERR_PTR(-ENOMEM);
>  
>  	inode = shmem_get_inode(&nop_mnt_idmap, mnt->mnt_sb, NULL,
> -				S_IFREG | S_IRWXUGO, 0, flags);
> +				S_IFREG | S_IRWXUGO, 0, vm_flags);
>  	if (IS_ERR(inode)) {
>  		shmem_unacct_size(flags, size);
>  		return ERR_CAST(inode);
> -- 
> 2.50.1.565.gc32cd1483b-goog
>