Unverified Commit bac0a9e5 authored by Christian Brauner's avatar Christian Brauner
Browse files

file: add alloc_file_pseudo_noaccount() 

When we open block devices as files we want to make sure to not charge
them against the open file limit of the caller as that can cause
spurious failures.

Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-1-adbd023e19cc@kernel.org


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 0873add0

fs/file_table.c

+24 −0
Original line number Diff line number Diff line
@@ -357,6 +357,30 @@ struct file *alloc_file_pseudo(struct inode *inode, struct vfsmount *mnt, 
}

EXPORT_SYMBOL(alloc_file_pseudo);



struct file *alloc_file_pseudo_noaccount(struct inode *inode,

					 struct vfsmount *mnt, const char *name,

					 int flags,

					 const struct file_operations *fops)

{

	int ret;

	struct path path;

	struct file *file;



	ret = alloc_path_pseudo(name, inode, mnt, &path);

	if (ret)

		return ERR_PTR(ret);



	file = alloc_empty_file_noaccount(flags, current_cred());

	if (IS_ERR(file)) {

		ihold(inode);

		path_put(&path);

		return file;

	}

	file_init_path(file, &path, fops);

	return file;

}

EXPORT_SYMBOL_GPL(alloc_file_pseudo_noaccount);



struct file *alloc_file_clone(struct file *base, int flags,

				const struct file_operations *fops)

{

include/linux/file.h

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,8 @@ struct inode; 
struct path;

extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *,

	const char *, int flags, const struct file_operations *);

extern struct file *alloc_file_pseudo_noaccount(struct inode *, struct vfsmount *,

	const char *, int flags, const struct file_operations *);

extern struct file *alloc_file_clone(struct file *, int flags,

	const struct file_operations *);