Commit d5aacad5 authored by Al Viro's avatar Al Viro
Browse files

New helper - simple_fsync() 



writes associated buffers, then does sync_inode() to write
the inode itself (and to make it clean).  Depends on
->write_inode() honouring the second argument.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 337eb00a

fs/libfs.c

+25 −0
Original line number Diff line number Diff line
@@ -9,6 +9,8 @@ 
#include <linux/vfs.h>

#include <linux/mutex.h>

#include <linux/exportfs.h>

#include <linux/writeback.h>

#include <linux/buffer_head.h>



#include <asm/uaccess.h>
@@ -807,6 +809,29 @@ struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid, 
}

EXPORT_SYMBOL_GPL(generic_fh_to_parent);



int simple_fsync(struct file *file, struct dentry *dentry, int datasync)

{

	struct writeback_control wbc = {

		.sync_mode = WB_SYNC_ALL,

		.nr_to_write = 0, /* metadata-only; caller takes care of data */

	};

	struct inode *inode = dentry->d_inode;

	int err;

	int ret;



	ret = sync_mapping_buffers(inode->i_mapping);

	if (!(inode->i_state & I_DIRTY))

		return ret;

	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))

		return ret;



	err = sync_inode(inode, &wbc);

	if (ret == 0)

		ret = err;

	return ret;

}

EXPORT_SYMBOL(simple_fsync);



EXPORT_SYMBOL(dcache_dir_close);

EXPORT_SYMBOL(dcache_dir_lseek);

EXPORT_SYMBOL(dcache_dir_open);

include/linux/fs.h

+2 −0
Original line number Diff line number Diff line
@@ -2345,6 +2345,8 @@ extern void simple_release_fs(struct vfsmount **mount, int *count); 
extern ssize_t simple_read_from_buffer(void __user *to, size_t count,

			loff_t *ppos, const void *from, size_t available);



extern int simple_fsync(struct file *, struct dentry *, int);



#ifdef CONFIG_MIGRATION

extern int buffer_migrate_page(struct address_space *,

				struct page *, struct page *);