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New helper - simple_fsync()

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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: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-06-07 14:56:44 -04:00
parent 337eb00a2c
commit d5aacad548
2 changed files with 27 additions and 0 deletions
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25
fs/libfs.c
View File

@ -9,6 +9,8 @@
#include <linux/vfs.h> #include <linux/vfs.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/exportfs.h> #include <linux/exportfs.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <asm/uaccess.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); 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_close);
EXPORT_SYMBOL(dcache_dir_lseek); EXPORT_SYMBOL(dcache_dir_lseek);
EXPORT_SYMBOL(dcache_dir_open); EXPORT_SYMBOL(dcache_dir_open);

2
include/linux/fs.h
View File

@ -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, extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
loff_t *ppos, const void *from, size_t available); loff_t *ppos, const void *from, size_t available);
extern int simple_fsync(struct file *, struct dentry *, int);
#ifdef CONFIG_MIGRATION #ifdef CONFIG_MIGRATION
extern int buffer_migrate_page(struct address_space *, extern int buffer_migrate_page(struct address_space *,
struct page *, struct page *); struct page *, struct page *);