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erofs: implement .fadvise for page cache share

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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@linux.alibaba.com>
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Hongzhen Luo 2026-01-23 01:31:32 +00:00 committed by Gao Xiang
parent 9364b55a4d
commit d86d7817c0
1 changed files with 7 additions and 0 deletions
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7
fs/erofs/ishare.c
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@ -151,6 +151,12 @@ static int erofs_ishare_mmap(struct file *file, struct vm_area_struct *vma)
return generic_file_readonly_mmap(file, 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 = { const struct file_operations erofs_ishare_fops = {
.open = erofs_ishare_file_open, .open = erofs_ishare_file_open,
.llseek = generic_file_llseek, .llseek = generic_file_llseek,
@ -159,6 +165,7 @@ const struct file_operations erofs_ishare_fops = {
.release = erofs_ishare_file_release, .release = erofs_ishare_file_release,
.get_unmapped_area = thp_get_unmapped_area, .get_unmapped_area = thp_get_unmapped_area,
.splice_read = filemap_splice_read, .splice_read = filemap_splice_read,
.fadvise = erofs_ishare_fadvise,
}; };
struct inode *erofs_real_inode(struct inode *inode, bool *need_iput) struct inode *erofs_real_inode(struct inode *inode, bool *need_iput)