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Message-Id: <20210614061512.3966143-3-hch@lst.de>
Date: Mon, 14 Jun 2021 08:15:11 +0200
From: Christoph Hellwig <hch@....de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: 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: [PATCH 2/3] fs: move ramfs_aops to libfs
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>
---
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
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