Commit d86d7817 authored by Hongzhen Luo's avatar Hongzhen Luo Committed by Gao Xiang
Browse files

erofs: implement .fadvise for page cache share 



This patch implements the .fadvise interface for page cache share.
Similar to overlayfs, it drops those clean, unused pages through
vfs_fadvise().

Signed-off-by: default avatarHongzhen Luo <hongzhen@linux.alibaba.com>
Signed-off-by: default avatarHongbo Li <lihongbo22@huawei.com>
Reviewed-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
parent 9364b55a

fs/erofs/ishare.c

+7 −0
Original line number Diff line number Diff line
@@ -151,6 +151,12 @@ static int erofs_ishare_mmap(struct file *file, struct vm_area_struct *vma) 
	return generic_file_readonly_mmap(file, vma);

}



static int erofs_ishare_fadvise(struct file *file, loff_t offset,

				loff_t len, int advice)

{

	return vfs_fadvise(file->private_data, offset, len, advice);

}



const struct file_operations erofs_ishare_fops = {

	.open		= erofs_ishare_file_open,

	.llseek		= generic_file_llseek,
@@ -159,6 +165,7 @@ const struct file_operations erofs_ishare_fops = { 
	.release	= erofs_ishare_file_release,

	.get_unmapped_area = thp_get_unmapped_area,

	.splice_read	= filemap_splice_read,

	.fadvise	= erofs_ishare_fadvise,

};



struct inode *erofs_real_inode(struct inode *inode, bool *need_iput)