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mount: Tree walking functions

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Two walkers -- in forward and reverse directions -- are required
for correct (u)mounting of subtrees. Implement them using a helper
macro which walks the tree in both directions.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2012-06-27 20:57:37 +04:00
parent 95964f1b13
commit f0c68e7361
1 changed files with 28 additions and 4 deletions
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32
mount.c
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@ -282,18 +282,42 @@ int dump_mnt_ns(int ns_pid, struct cr_fdset *fdset)
return 0;
}
#define MNT_TREE_WALK(_mi, _el, _fn_f, _fn_r) do { \
while (1) { \
if (_fn_f(_mi)) \
return -1; \
if (!list_empty(&_mi->children)) { \
_mi = list_entry(_mi->children._el, \
struct mount_info, siblings); \
continue; \
} \
up: \
if (_fn_r(_mi)) \
return -1; \
if (_mi->parent == NULL) \
return 0; \
if (_mi->siblings._el == &_mi->parent->children) { \
_mi = _mi->parent; \
goto up; \
} \
_mi = list_entry(_mi->siblings._el, \
struct mount_info, siblings); \
} \
} while (0)
#define MNT_WALK_NONE 0 &&
static int mnt_tree_for_each(struct mount_info *m,
int (*fn)(struct mount_info *))
{
pr_err("NOT IMPLEMENTED\n");
return -1;
MNT_TREE_WALK(m, next, fn, MNT_WALK_NONE);
}
static int mnt_tree_for_each_reverse(struct mount_info *m,
int (*fn)(struct mount_info *))
{
pr_err("NOT IMPLEMENTED\n");
return -1;
MNT_TREE_WALK(m, prev, MNT_WALK_NONE, fn);
}
static int do_mount_one(struct mount_info *mi)