fs/smb/client/dfs.h

Source file repositories/reference/linux-study-clean/fs/smb/client/dfs.h

File Facts

System
Linux kernel
Corpus path
fs/smb/client/dfs.h
Extension
.h
Size
4895 bytes
Lines
200
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dfs_ref {
	char *path;
	char *full_path;
	struct cifs_ses *ses;
	struct dfs_cache_tgt_list tl;
	struct dfs_cache_tgt_iterator *tit;
};

struct dfs_ref_walk {
	struct cifs_mount_ctx	*mnt_ctx;
	struct dfs_ref		*ref;
	struct dfs_ref		refs[MAX_NESTED_LINKS];
};

#define ref_walk_start(w)	((w)->refs)
#define ref_walk_end(w)	(&(w)->refs[ARRAY_SIZE((w)->refs) - 1])
#define ref_walk_cur(w)	((w)->ref)
#define ref_walk_descend(w)	(--ref_walk_cur(w) >= ref_walk_start(w))

#define ref_walk_tit(w)	(ref_walk_cur(w)->tit)
#define ref_walk_path(w)	(ref_walk_cur(w)->path)
#define ref_walk_fpath(w)	(ref_walk_cur(w)->full_path)
#define ref_walk_tl(w)		(&ref_walk_cur(w)->tl)
#define ref_walk_ses(w)	(ref_walk_cur(w)->ses)

static inline struct dfs_ref_walk *ref_walk_alloc(void)
{
	struct dfs_ref_walk *rw;

	rw = kmalloc_obj(*rw);
	if (!rw)
		return ERR_PTR(-ENOMEM);
	return rw;
}

static inline void ref_walk_init(struct dfs_ref_walk *rw,
				 struct cifs_mount_ctx *mnt_ctx)
{
	memset(rw, 0, sizeof(*rw));
	rw->mnt_ctx = mnt_ctx;
	ref_walk_cur(rw) = ref_walk_start(rw);
}

static inline void __ref_walk_free(struct dfs_ref *ref)
{
	kfree(ref->path);
	kfree(ref->full_path);
	dfs_cache_free_tgts(&ref->tl);
	if (ref->ses)
		cifs_put_smb_ses(ref->ses);
	memset(ref, 0, sizeof(*ref));
}

static inline void ref_walk_free(struct dfs_ref_walk *rw)
{
	struct dfs_ref *ref;

	if (!rw)
		return;

	for (ref = ref_walk_start(rw); ref <= ref_walk_end(rw); ref++)
		__ref_walk_free(ref);
	kfree(rw);
}

static inline int ref_walk_advance(struct dfs_ref_walk *rw)
{
	struct dfs_ref *ref = ref_walk_cur(rw) + 1;

	if (ref > ref_walk_end(rw))
		return -ELOOP;
	__ref_walk_free(ref);
	ref_walk_cur(rw) = ref;
	return 0;
}

static inline struct dfs_cache_tgt_iterator *
ref_walk_next_tgt(struct dfs_ref_walk *rw)
{
	struct dfs_ref *ref = ref_walk_cur(rw);
	struct dfs_cache_tgt_iterator *tit;

	if (IS_ERR(ref->tit))
		return NULL;

	if (!ref->tit)
		tit = dfs_cache_get_tgt_iterator(&ref->tl);
	else
		tit = dfs_cache_get_next_tgt(&ref->tl, ref->tit);

Annotation

Implementation Notes