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fs: add scoped_with_init_fs()

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Similar to scoped_with_kernel_creds() allow a temporary override of
current->fs to serve the few places where lookup is performed from
kthread context or needs init's filesytem state.

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-3-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-06-01 15:56:36 +02:00
parent d114eb8577
commit 67c54d1d73
1 changed files with 31 additions and 0 deletions
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31
include/linux/fs_struct.h
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@@ -6,6 +6,7 @@
#include <linux/path.h>
#include <linux/spinlock.h>
#include <linux/seqlock.h>
#include <linux/vfsdebug.h>
struct fs_struct {
int users;
@@ -49,4 +50,34 @@ static inline int current_umask(void)
return current->fs->umask;
}
/*
* Temporarily use userspace_init_fs for path resolution in kthreads.
* Callers should use scoped_with_init_fs() which automatically
* restores the original fs_struct at scope exit.
*/
static inline struct fs_struct *__override_init_fs(void)
{
struct fs_struct *fs;
fs = current->fs;
WRITE_ONCE(current->fs, fs);
return fs;
}
static inline void __revert_init_fs(struct fs_struct *revert_fs)
{
VFS_WARN_ON_ONCE(current->fs != revert_fs);
WRITE_ONCE(current->fs, revert_fs);
}
DEFINE_CLASS(__override_init_fs,
struct fs_struct *,
__revert_init_fs(_T),
__override_init_fs(), void)
#define scoped_with_init_fs() \
scoped_class(__override_init_fs, __UNIQUE_ID(label))
void __init init_userspace_fs(void);
#endif /* _LINUX_FS_STRUCT_H */