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Date: Mon, 14 Jun 2021 11:45:15 +0200
From: Jan Kara <jack@...e.cz>
To: Christoph Hellwig <hch@....de>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
Al Viro <viro@...iv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] fs: move ramfs_aops to libfs
On Mon 14-06-21 08:15:11, Christoph Hellwig wrote:
> Move the ramfs aops to libfs and reuse them for kernfs and configfs.
> Thosw two did not wire up ->set_page_dirty before and now get
> __set_page_dirty_no_writeback, which is the right one for no-writeback
> address_space usage.
>
> Drop the now unused exports of the libfs helpers only used for
> ramfs-style pagecache usage.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
Looks good. Feel free to add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/configfs/inode.c | 8 +-------
> fs/kernfs/inode.c | 8 +-------
> fs/libfs.c | 17 +++++++++++++----
> fs/ramfs/inode.c | 9 +--------
> include/linux/fs.h | 5 +----
> 5 files changed, 17 insertions(+), 30 deletions(-)
>
> diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
> index eb5ec3e46283..b601610e9907 100644
> --- a/fs/configfs/inode.c
> +++ b/fs/configfs/inode.c
> @@ -28,12 +28,6 @@
> static struct lock_class_key default_group_class[MAX_LOCK_DEPTH];
> #endif
>
> -static const struct address_space_operations configfs_aops = {
> - .readpage = simple_readpage,
> - .write_begin = simple_write_begin,
> - .write_end = simple_write_end,
> -};
> -
> static const struct inode_operations configfs_inode_operations ={
> .setattr = configfs_setattr,
> };
> @@ -114,7 +108,7 @@ struct inode *configfs_new_inode(umode_t mode, struct configfs_dirent *sd,
> struct inode * inode = new_inode(s);
> if (inode) {
> inode->i_ino = get_next_ino();
> - inode->i_mapping->a_ops = &configfs_aops;
> + inode->i_mapping->a_ops = &ram_aops;
> inode->i_op = &configfs_inode_operations;
>
> if (sd->s_iattr) {
> diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
> index d73950fc3d57..26f2aa3586f9 100644
> --- a/fs/kernfs/inode.c
> +++ b/fs/kernfs/inode.c
> @@ -17,12 +17,6 @@
>
> #include "kernfs-internal.h"
>
> -static const struct address_space_operations kernfs_aops = {
> - .readpage = simple_readpage,
> - .write_begin = simple_write_begin,
> - .write_end = simple_write_end,
> -};
> -
> static const struct inode_operations kernfs_iops = {
> .permission = kernfs_iop_permission,
> .setattr = kernfs_iop_setattr,
> @@ -203,7 +197,7 @@ static void kernfs_init_inode(struct kernfs_node *kn, struct inode *inode)
> {
> kernfs_get(kn);
> inode->i_private = kn;
> - inode->i_mapping->a_ops = &kernfs_aops;
> + inode->i_mapping->a_ops = &ram_aops;
> inode->i_op = &kernfs_iops;
> inode->i_generation = kernfs_gen(kn);
>
> diff --git a/fs/libfs.c b/fs/libfs.c
> index e9b29c6ffccb..2d7f086b93d6 100644
> --- a/fs/libfs.c
> +++ b/fs/libfs.c
> @@ -512,7 +512,7 @@ int simple_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
> }
> EXPORT_SYMBOL(simple_setattr);
>
> -int simple_readpage(struct file *file, struct page *page)
> +static int simple_readpage(struct file *file, struct page *page)
> {
> clear_highpage(page);
> flush_dcache_page(page);
> @@ -520,7 +520,6 @@ int simple_readpage(struct file *file, struct page *page)
> unlock_page(page);
> return 0;
> }
> -EXPORT_SYMBOL(simple_readpage);
>
> int simple_write_begin(struct file *file, struct address_space *mapping,
> loff_t pos, unsigned len, unsigned flags,
> @@ -568,7 +567,7 @@ EXPORT_SYMBOL(simple_write_begin);
> *
> * Use *ONLY* with simple_readpage()
> */
> -int simple_write_end(struct file *file, struct address_space *mapping,
> +static int simple_write_end(struct file *file, struct address_space *mapping,
> loff_t pos, unsigned len, unsigned copied,
> struct page *page, void *fsdata)
> {
> @@ -597,7 +596,17 @@ int simple_write_end(struct file *file, struct address_space *mapping,
>
> return copied;
> }
> -EXPORT_SYMBOL(simple_write_end);
> +
> +/*
> + * Provides ramfs-style behavior: data in the pagecache, but no writeback.
> + */
> +const struct address_space_operations ram_aops = {
> + .readpage = simple_readpage,
> + .write_begin = simple_write_begin,
> + .write_end = simple_write_end,
> + .set_page_dirty = __set_page_dirty_no_writeback,
> +};
> +EXPORT_SYMBOL(ram_aops);
>
> /*
> * the inodes created here are not hashed. If you use iunique to generate
> diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
> index 9ebd17d7befb..65e7e56005b8 100644
> --- a/fs/ramfs/inode.c
> +++ b/fs/ramfs/inode.c
> @@ -53,13 +53,6 @@ struct ramfs_fs_info {
> static const struct super_operations ramfs_ops;
> static const struct inode_operations ramfs_dir_inode_operations;
>
> -static const struct address_space_operations ramfs_aops = {
> - .readpage = simple_readpage,
> - .write_begin = simple_write_begin,
> - .write_end = simple_write_end,
> - .set_page_dirty = __set_page_dirty_no_writeback,
> -};
> -
> struct inode *ramfs_get_inode(struct super_block *sb,
> const struct inode *dir, umode_t mode, dev_t dev)
> {
> @@ -68,7 +61,7 @@ struct inode *ramfs_get_inode(struct super_block *sb,
> if (inode) {
> inode->i_ino = get_next_ino();
> inode_init_owner(&init_user_ns, inode, dir, mode);
> - inode->i_mapping->a_ops = &ramfs_aops;
> + inode->i_mapping->a_ops = &ram_aops;
> mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
> mapping_set_unevictable(inode->i_mapping);
> inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index c3c88fdb9b2a..869909345420 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -3422,13 +3422,10 @@ extern void noop_invalidatepage(struct page *page, unsigned int offset,
> unsigned int length);
> extern ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
> extern int simple_empty(struct dentry *);
> -extern int simple_readpage(struct file *file, struct page *page);
> extern int simple_write_begin(struct file *file, struct address_space *mapping,
> loff_t pos, unsigned len, unsigned flags,
> struct page **pagep, void **fsdata);
> -extern int simple_write_end(struct file *file, struct address_space *mapping,
> - loff_t pos, unsigned len, unsigned copied,
> - struct page *page, void *fsdata);
> +extern const struct address_space_operations ram_aops;
> extern int always_delete_dentry(const struct dentry *);
> extern struct inode *alloc_anon_inode(struct super_block *);
> extern int simple_nosetlease(struct file *, long, struct file_lock **, void **);
> --
> 2.30.2
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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