From: Hongzhen Luo <[email protected]> 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 <[email protected]> Signed-off-by: Hongbo Li <[email protected]> --- fs/erofs/ishare.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/erofs/ishare.c b/fs/erofs/ishare.c index 634b7ea63738..f4ca35a07072 100644 --- a/fs/erofs/ishare.c +++ b/fs/erofs/ishare.c @@ -153,6 +153,13 @@ 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, @@ -161,6 +168,7 @@ 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
