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allow to use CLASS() for struct filename * 

Not all users match that model, but most of them do.  By the end of
the series we'll be left with very few irregular ones...

Added:
CLASS(filename, name)(user_path) =>
	getname(user_path)
CLASS(filename_kernel, name)(string) =>
	getname_kernel(string)
CLASS(filename_flags, name)(user_path, flags) =>
	getname_flags(user_path, flags)
CLASS(filename_uflags, name)(user_path, flags) =>
	getname_uflags(user_path, flags)
CLASS(filename_maybe_null, name)(user_path, flags) =>
	getname_maybe_null(user_path, flags)
all with putname() as destructor.

"flags" in filename_flags is in LOOKUP_... space, only LOOKUP_EMPTY matters.
"flags" in filename_uflags and filename_maybe_null is in AT_...... space,
and only AT_EMPTY_PATH matters.

filename_flags conventions might be worth reconsidering later (it might or
might not be better off with boolean instead)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
master
Al Viro 2025-10-31 13:16:03 -04:00
parent 12b5bc2a0d
commit 24df85ffb9
1 changed files with 6 additions and 0 deletions
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6
include/linux/fs.h
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@ -2517,6 +2517,12 @@ static inline struct filename *refname(struct filename *name)
return name;
}
DEFINE_CLASS(filename, struct filename *, putname(_T), getname(p), const char __user *p)
EXTEND_CLASS(filename, _kernel, getname_kernel(p), const char *p)
EXTEND_CLASS(filename, _flags, getname_flags(p, f), const char __user *p, unsigned int f)
EXTEND_CLASS(filename, _uflags, getname_uflags(p, f), const char __user *p, unsigned int f)
EXTEND_CLASS(filename, _maybe_null, getname_maybe_null(p, f), const char __user *p, unsigned int f)
extern int finish_open(struct file *file, struct dentry *dentry,
int (*open)(struct inode *, struct file *));
extern int finish_no_open(struct file *file, struct dentry *dentry);