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.

Link: https://lkml.kernel.org/r/20210614061512.3966143-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index eb5ec3e..b601610 100644 (file)
--- 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 d73950f..26f2aa3 100644 (file)
--- 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 e9b29c6..2d7f086 100644 (file)
--- 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 9ebd17d..65e7e56 100644 (file)
--- 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 c3c88fd..8699093 100644 (file)
--- 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 **);