On 10/17/22 9:55 AM, Dawei Li wrote:
> s_inodes is superblock-specific resource, which should be
> protected by sb's specific lock s_inode_list_lock.
>
> v2: update the locking mechanisim to protect mutual-exclusive access
> both for s_inode_list_lock & erofs_fscache_domain_init_cookie(), as the
> reviewing comments from Jia Zhu.
>
> v1:
> https://lore.kernel.org/all/tycp286mb23237a9993e0ffcfe5c2bdbeca...@tycp286mb2323.jpnp286.prod.outlook.com/
>
> base-commit: 8436c4a57bd147b0bd2943ab499bb8368981b9e1
>
> Signed-off-by: Dawei Li <[email protected]>
Fixes: 7d41963759fe ("erofs: Support sharing cookies in the same domain")
LGTM.
Reviewed-by: Jingbo Xu <[email protected]>
> ---
> fs/erofs/fscache.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
> index 998cd26a1b3b..fe05bc51f9f2 100644
> --- a/fs/erofs/fscache.c
> +++ b/fs/erofs/fscache.c
> @@ -590,14 +590,17 @@ struct erofs_fscache
> *erofs_domain_register_cookie(struct super_block *sb,
> struct super_block *psb = erofs_pseudo_mnt->mnt_sb;
>
> mutex_lock(&erofs_domain_cookies_lock);
> + spin_lock(&psb->s_inode_list_lock);
> list_for_each_entry(inode, &psb->s_inodes, i_sb_list) {
> ctx = inode->i_private;
> if (!ctx || ctx->domain != domain || strcmp(ctx->name, name))
> continue;
> igrab(inode);
> + spin_unlock(&psb->s_inode_list_lock);
> mutex_unlock(&erofs_domain_cookies_lock);
> return ctx;
> }
> + spin_unlock(&psb->s_inode_list_lock);
> ctx = erofs_fscache_domain_init_cookie(sb, name, need_inode);
> mutex_unlock(&erofs_domain_cookies_lock);
> return ctx;
--
Thanks,
Jingbo
