linux-kernel - [PATCH v12 10/10] erofs: implement .fadvise for page cache share

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Message-ID: <20251231090118.541061-11-lihongbo22@huawei.com>
Date: Wed, 31 Dec 2025 09:01:18 +0000
From: Hongbo Li <lihongbo22@...wei.com>
To: <hsiangkao@...ux.alibaba.com>, <chao@...nel.org>, <brauner@...nel.org>
CC: <djwong@...nel.org>, <amir73il@...il.com>, <hch@....de>,
	<lihongbo22@...wei.com>, <linux-fsdevel@...r.kernel.org>,
	<linux-erofs@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v12 10/10] erofs: implement .fadvise for page cache share

From: Hongzhen Luo <hongzhen@...ux.alibaba.com>

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: Hongzhen Luo <hongzhen@...ux.alibaba.com>
Signed-off-by: Hongbo Li <lihongbo22@...wei.com>
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/ishare.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/erofs/ishare.c b/fs/erofs/ishare.c
index b91f0ce412c0..2b7660d7e9d4 100644
--- a/fs/erofs/ishare.c
+++ b/fs/erofs/ishare.c
@@ -152,6 +152,13 @@ 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((struct file *)file->private_data,
+			   offset, len, advice);
+}
+
 const struct file_operations erofs_ishare_fops = {
 	.open		= erofs_ishare_file_open,
 	.llseek		= generic_file_llseek,
@@ -160,6 +167,7 @@ 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)
-- 
2.22.0