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take anon inode allocation to libfs.c

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-10-02 22:35:11 -04:00
parent 22a8cb8248
commit 6987843ff7
3 changed files with 46 additions and 48 deletions
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50
fs/anon_inodes.c
View file

@ -24,7 +24,6 @@
static struct vfsmount *anon_inode_mnt __read_mostly;
static struct inode *anon_inode_inode;
static const struct file_operations anon_inode_fops;
/*
* anon_inodefs_dname() is called from d_path().
@ -39,51 +38,6 @@ static const struct dentry_operations anon_inodefs_dentry_operations = {
.d_dname = anon_inodefs_dname,
};
/*
* nop .set_page_dirty method so that people can use .page_mkwrite on
* anon inodes.
*/
static int anon_set_page_dirty(struct page *page)
{
return 0;
};
static const struct address_space_operations anon_aops = {
.set_page_dirty = anon_set_page_dirty,
};
/*
* A single inode exists for all anon_inode files. Contrary to pipes,
* anon_inode inodes have no associated per-instance data, so we need
* only allocate one of them.
*/
static struct inode *anon_inode_mkinode(struct super_block *s)
{
struct inode *inode = new_inode_pseudo(s);
if (!inode)
return ERR_PTR(-ENOMEM);
inode->i_ino = get_next_ino();
inode->i_fop = &anon_inode_fops;
inode->i_mapping->a_ops = &anon_aops;
/*
* Mark the inode dirty from the very beginning,
* that way it will never be moved to the dirty
* list because mark_inode_dirty() will think
* that it already _is_ on the dirty list.
*/
inode->i_state = I_DIRTY;
inode->i_mode = S_IRUSR | S_IWUSR;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
inode->i_flags |= S_PRIVATE;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
return inode;
}
static struct dentry *anon_inodefs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
@ -92,7 +46,7 @@ static struct dentry *anon_inodefs_mount(struct file_system_type *fs_type,
&anon_inodefs_dentry_operations, ANON_INODE_FS_MAGIC);
if (!IS_ERR(root)) {
struct super_block *s = root->d_sb;
anon_inode_inode = anon_inode_mkinode(s);
anon_inode_inode = alloc_anon_inode(s);
if (IS_ERR(anon_inode_inode)) {
dput(root);
deactivate_locked_super(s);
@ -134,7 +88,7 @@ struct file *anon_inode_getfile_private(const char *name,
if (fops->owner && !try_module_get(fops->owner))
return ERR_PTR(-ENOENT);
inode = anon_inode_mkinode(anon_inode_mnt->mnt_sb);
inode = alloc_anon_inode(anon_inode_mnt->mnt_sb);
if (IS_ERR(inode)) {
file = ERR_PTR(-ENOMEM);
goto err_module;

43
fs/libfs.c
View file

@ -1002,3 +1002,46 @@ void kfree_put_link(struct dentry *dentry, struct nameidata *nd,
kfree(s);
}
EXPORT_SYMBOL(kfree_put_link);
/*
* nop .set_page_dirty method so that people can use .page_mkwrite on
* anon inodes.
*/
static int anon_set_page_dirty(struct page *page)
{
return 0;
};
/*
* A single inode exists for all anon_inode files. Contrary to pipes,
* anon_inode inodes have no associated per-instance data, so we need
* only allocate one of them.
*/
struct inode *alloc_anon_inode(struct super_block *s)
{
static const struct address_space_operations anon_aops = {
.set_page_dirty = anon_set_page_dirty,
};
struct inode *inode = new_inode_pseudo(s);
if (!inode)
return ERR_PTR(-ENOMEM);
inode->i_ino = get_next_ino();
inode->i_mapping->a_ops = &anon_aops;
/*
* Mark the inode dirty from the very beginning,
* that way it will never be moved to the dirty
* list because mark_inode_dirty() will think
* that it already _is_ on the dirty list.
*/
inode->i_state = I_DIRTY;
inode->i_mode = S_IRUSR | S_IWUSR;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
inode->i_flags |= S_PRIVATE;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
return inode;
}
EXPORT_SYMBOL(alloc_anon_inode);

1
include/linux/fs.h
View file

@ -2562,6 +2562,7 @@ extern int simple_write_begin(struct file *file, struct address_space *mapping,
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 struct inode *alloc_anon_inode(struct super_block *);
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);