From f23918016238a67b98740bdcb2509e290715977a Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Wed, 24 Jan 2018 12:48:59 -0800 Subject: [PATCH] libbtrfsutil: add btrfs_util_deleted_subvolumes() Signed-off-by: Omar Sandoval Signed-off-by: David Sterba --- libbtrfsutil/btrfsutil.h | 21 +++++++ libbtrfsutil/python/btrfsutilpy.h | 3 + libbtrfsutil/python/module.c | 30 ++++++++++ libbtrfsutil/python/qgroup.c | 17 +----- libbtrfsutil/python/subvolume.c | 30 ++++++++++ libbtrfsutil/python/tests/test_subvolume.py | 8 +++ libbtrfsutil/subvolume.c | 89 +++++++++++++++++++++++++++++ 7 files changed, 183 insertions(+), 15 deletions(-) diff --git a/libbtrfsutil/btrfsutil.h b/libbtrfsutil/btrfsutil.h index 6717b65..6d655f4 100644 --- a/libbtrfsutil/btrfsutil.h +++ b/libbtrfsutil/btrfsutil.h @@ -581,6 +581,27 @@ enum btrfs_util_error btrfs_util_subvolume_iterator_next_info(struct btrfs_util_ struct btrfs_util_subvolume_info *subvol); /** + * btrfs_util_deleted_subvolumes() - Get a list of subvolume which have been + * deleted but not yet cleaned up. + * @path: Path on a Btrfs filesystem. + * @ids: Returned array of subvolume IDs. + * @n: Returned number of IDs in the @ids array. + * + * This requires appropriate privilege (CAP_SYS_ADMIN). + * + * Return: %BTRFS_UTIL_OK on success, non-zero error code on failure. + */ +enum btrfs_util_error btrfs_util_deleted_subvolumes(const char *path, + uint64_t **ids, + size_t *n); + +/** + * btrfs_util_deleted_subvolumes_fd() - See btrfs_util_deleted_subvolumes(). + */ +enum btrfs_util_error btrfs_util_deleted_subvolumes_fd(int fd, uint64_t **ids, + size_t *n); + +/** * btrfs_util_create_qgroup_inherit() - Create a qgroup inheritance specifier * for btrfs_util_create_subvolume() or btrfs_util_create_snapshot(). * @flags: Must be zero. diff --git a/libbtrfsutil/python/btrfsutilpy.h b/libbtrfsutil/python/btrfsutilpy.h index 0ee6afa..af3a6ed 100644 --- a/libbtrfsutil/python/btrfsutilpy.h +++ b/libbtrfsutil/python/btrfsutilpy.h @@ -54,6 +54,8 @@ struct path_arg { int path_converter(PyObject *o, void *p); void path_cleanup(struct path_arg *path); +PyObject *list_from_uint64_array(const uint64_t *arr, size_t n); + void SetFromBtrfsUtilError(enum btrfs_util_error err); void SetFromBtrfsUtilErrorWithPath(enum btrfs_util_error err, struct path_arg *path); @@ -75,6 +77,7 @@ PyObject *set_default_subvolume(PyObject *self, PyObject *args, PyObject *kwds); PyObject *create_subvolume(PyObject *self, PyObject *args, PyObject *kwds); PyObject *create_snapshot(PyObject *self, PyObject *args, PyObject *kwds); PyObject *delete_subvolume(PyObject *self, PyObject *args, PyObject *kwds); +PyObject *deleted_subvolumes(PyObject *self, PyObject *args, PyObject *kwds); void add_module_constants(PyObject *m); diff --git a/libbtrfsutil/python/module.c b/libbtrfsutil/python/module.c index fe25f4b..2dbdc7b 100644 --- a/libbtrfsutil/python/module.c +++ b/libbtrfsutil/python/module.c @@ -125,6 +125,29 @@ err: return 0; } +PyObject *list_from_uint64_array(const uint64_t *arr, size_t n) +{ + PyObject *ret; + size_t i; + + ret = PyList_New(n); + if (!ret) + return NULL; + + for (i = 0; i < n; i++) { + PyObject *tmp; + + tmp = PyLong_FromUnsignedLongLong(arr[i]); + if (!tmp) { + Py_DECREF(ret); + return NULL; + } + PyList_SET_ITEM(ret, i, tmp); + } + + return ret; +} + void path_cleanup(struct path_arg *path) { Py_CLEAR(path->object); @@ -235,6 +258,13 @@ static PyMethodDef btrfsutil_methods[] = { "path -- string, bytes, or path-like object\n" "recursive -- if the given subvolume has child subvolumes, delete\n" "them instead of failing"}, + {"deleted_subvolumes", (PyCFunction)deleted_subvolumes, + METH_VARARGS | METH_KEYWORDS, + "deleted_subvolumes(path)\n\n" + "Get the list of subvolume IDs which have been deleted but not yet\n" + "cleaned up\n\n" + "Arguments:\n" + "path -- string, bytes, path-like object, or open file descriptor"}, {}, }; diff --git a/libbtrfsutil/python/qgroup.c b/libbtrfsutil/python/qgroup.c index 69716d9..44ac5eb 100644 --- a/libbtrfsutil/python/qgroup.c +++ b/libbtrfsutil/python/qgroup.c @@ -55,25 +55,12 @@ static PyObject *QgroupInherit_getattro(QgroupInherit *self, PyObject *nameobj) } if (strcmp(name, "groups") == 0) { - PyObject *ret, *tmp; const uint64_t *arr; - size_t n, i; + size_t n; btrfs_util_qgroup_inherit_get_groups(self->inherit, &arr, &n); - ret = PyList_New(n); - if (!ret) - return NULL; - - for (i = 0; i < n; i++) { - tmp = PyLong_FromUnsignedLongLong(arr[i]); - if (!tmp) { - Py_DECREF(ret); - return NULL; - } - PyList_SET_ITEM(ret, i, tmp); - } - return ret; + return list_from_uint64_array(arr, n); } else { return PyObject_GenericGetAttr((PyObject *)self, nameobj); } diff --git a/libbtrfsutil/python/subvolume.c b/libbtrfsutil/python/subvolume.c index eb3f6e2..069e606 100644 --- a/libbtrfsutil/python/subvolume.c +++ b/libbtrfsutil/python/subvolume.c @@ -425,6 +425,36 @@ PyObject *delete_subvolume(PyObject *self, PyObject *args, PyObject *kwds) Py_RETURN_NONE; } +PyObject *deleted_subvolumes(PyObject *self, PyObject *args, PyObject *kwds) +{ + static char *keywords[] = {"path", NULL}; + struct path_arg path = {.allow_fd = true}; + PyObject *ret; + uint64_t *ids; + size_t n; + enum btrfs_util_error err; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&:deleted_subvolumes", + keywords, &path_converter, &path)) + return NULL; + + if (path.path) + err = btrfs_util_deleted_subvolumes(path.path, &ids, &n); + else + err = btrfs_util_deleted_subvolumes_fd(path.fd, &ids, &n); + if (err) { + SetFromBtrfsUtilErrorWithPath(err, &path); + path_cleanup(&path); + return NULL; + } + + path_cleanup(&path); + + ret = list_from_uint64_array(ids, n); + free(ids); + return ret; +} + typedef struct { PyObject_HEAD struct btrfs_util_subvolume_iterator *iter; diff --git a/libbtrfsutil/python/tests/test_subvolume.py b/libbtrfsutil/python/tests/test_subvolume.py index 08083ab..a46d4a3 100644 --- a/libbtrfsutil/python/tests/test_subvolume.py +++ b/libbtrfsutil/python/tests/test_subvolume.py @@ -318,6 +318,14 @@ class TestSubvolume(BtrfsTestCase): btrfsutil.delete_subvolume(subvol + '5', recursive=True) self.assertFalse(os.path.exists(subvol + '5')) + def test_deleted_subvolumes(self): + subvol = os.path.join(self.mountpoint, 'subvol') + btrfsutil.create_subvolume(subvol + '1') + btrfsutil.delete_subvolume(subvol + '1') + for arg in self.path_or_fd(self.mountpoint): + with self.subTest(type=type(arg)): + self.assertEqual(btrfsutil.deleted_subvolumes(arg), [256]) + def test_subvolume_iterator(self): pwd = os.getcwd() try: diff --git a/libbtrfsutil/subvolume.c b/libbtrfsutil/subvolume.c index 56cd2c6..d972828 100644 --- a/libbtrfsutil/subvolume.c +++ b/libbtrfsutil/subvolume.c @@ -1279,3 +1279,92 @@ PUBLIC enum btrfs_util_error btrfs_util_subvolume_iterator_next_info(struct btrf return btrfs_util_subvolume_info_fd(iter->fd, id, subvol); } + +PUBLIC enum btrfs_util_error btrfs_util_deleted_subvolumes(const char *path, + uint64_t **ids, + size_t *n) +{ + enum btrfs_util_error err; + int fd; + + fd = open(path, O_RDONLY); + if (fd == -1) + return BTRFS_UTIL_ERROR_OPEN_FAILED; + + err = btrfs_util_deleted_subvolumes_fd(fd, ids, n); + SAVE_ERRNO_AND_CLOSE(fd); + return err; +} + +PUBLIC enum btrfs_util_error btrfs_util_deleted_subvolumes_fd(int fd, + uint64_t **ids, + size_t *n) +{ + size_t capacity = 0; + struct btrfs_ioctl_search_args search = { + .key = { + .tree_id = BTRFS_ROOT_TREE_OBJECTID, + .min_objectid = BTRFS_ORPHAN_OBJECTID, + .max_objectid = BTRFS_ORPHAN_OBJECTID, + .min_type = BTRFS_ORPHAN_ITEM_KEY, + .max_type = BTRFS_ORPHAN_ITEM_KEY, + .min_offset = 0, + .max_offset = UINT64_MAX, + .min_transid = 0, + .max_transid = UINT64_MAX, + .nr_items = 0, + }, + }; + enum btrfs_util_error err; + size_t items_pos = 0, buf_off = 0; + int ret; + + *ids = NULL; + *n = 0; + for (;;) { + const struct btrfs_ioctl_search_header *header; + + if (items_pos >= search.key.nr_items) { + search.key.nr_items = 4096; + ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search); + if (ret == -1) { + err = BTRFS_UTIL_ERROR_SEARCH_FAILED; + goto out; + } + items_pos = 0; + buf_off = 0; + + if (search.key.nr_items == 0) + break; + } + + header = (struct btrfs_ioctl_search_header *)(search.buf + buf_off); + if (*n >= capacity) { + size_t new_capacity = capacity ? capacity * 2 : 1; + uint64_t *new_ids; + + new_ids = reallocarray(*ids, new_capacity, + sizeof(**ids)); + if (!new_ids) + return BTRFS_UTIL_ERROR_NO_MEMORY; + + *ids = new_ids; + capacity = new_capacity; + } + + (*ids)[(*n)++] = header->offset; + + items_pos++; + buf_off += sizeof(*header) + header->len; + search.key.min_offset = header->offset + 1; + } + + err = BTRFS_UTIL_OK; +out: + if (err) { + free(*ids); + *ids = NULL; + *n = 0; + } + return err; +} -- 2.7.4