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Diffstat (limited to 'src/shared/btrfs-util.c')
-rw-r--r--src/shared/btrfs-util.c180
1 files changed, 157 insertions, 23 deletions
diff --git a/src/shared/btrfs-util.c b/src/shared/btrfs-util.c
index 9b47330a6f..164ac9f337 100644
--- a/src/shared/btrfs-util.c
+++ b/src/shared/btrfs-util.c
@@ -341,7 +341,7 @@ int btrfs_subvol_get_id_fd(int fd, uint64_t *ret) {
int btrfs_subvol_get_info_fd(int fd, BtrfsSubvolInfo *ret) {
struct btrfs_ioctl_search_args args = {
/* Tree of tree roots */
- .key.tree_id = 1,
+ .key.tree_id = BTRFS_ROOT_TREE_OBJECTID,
/* Look precisely for the subvolume items */
.key.min_type = BTRFS_ROOT_ITEM_KEY,
@@ -352,14 +352,10 @@ int btrfs_subvol_get_info_fd(int fd, BtrfsSubvolInfo *ret) {
.key.max_offset = (uint64_t) -1,
.key.min_transid = 0,
.key.max_transid = (uint64_t) -1,
-
- /* Some large value */
- .key.nr_items = 2,
};
- struct btrfs_ioctl_search_header *sh;
- struct btrfs_root_item *ri;
uint64_t subvol_id;
+ bool found = false;
int r;
assert(fd >= 0);
@@ -370,30 +366,168 @@ int btrfs_subvol_get_info_fd(int fd, BtrfsSubvolInfo *ret) {
return r;
args.key.min_objectid = args.key.max_objectid = subvol_id;
- if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
- return -errno;
- if (args.key.nr_items != 1)
- return -EIO;
+ for (;;) {
+ const struct btrfs_ioctl_search_header *sh;
+ unsigned i;
+
+ args.key.nr_items = 256;
+ if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
+ return -errno;
+
+ if (args.key.nr_items <= 0)
+ break;
- sh = (struct btrfs_ioctl_search_header*) args.buf;
- assert(sh->type == BTRFS_ROOT_ITEM_KEY);
- assert(sh->objectid == subvol_id);
+ for (i = 0,
+ sh = (const struct btrfs_ioctl_search_header*) args.buf;
+ i < args.key.nr_items;
+ i++,
+ args.key.min_type = sh->type,
+ args.key.min_offset = sh->offset,
+ args.key.min_objectid = sh->objectid,
+ sh = (const struct btrfs_ioctl_search_header*) ((uint8_t*) sh + sizeof(struct btrfs_ioctl_search_header) + sh->len)) {
- if (sh->len < offsetof(struct btrfs_root_item, otime) + sizeof(struct btrfs_timespec))
- return -ENOTSUP;
+ const struct btrfs_root_item *ri;
+
+ if (sh->objectid != subvol_id)
+ continue;
+ if (sh->type != BTRFS_ROOT_ITEM_KEY)
+ continue;
+ if (sh->len < offsetof(struct btrfs_root_item, otime) + sizeof(struct btrfs_timespec))
+ continue;
- ri = (struct btrfs_root_item *)(args.buf + sizeof(struct btrfs_ioctl_search_header));
+ ri = (const struct btrfs_root_item *)(args.buf + sizeof(struct btrfs_ioctl_search_header));
- ret->otime = (usec_t) le64toh(ri->otime.sec) * USEC_PER_SEC +
- (usec_t) le32toh(ri->otime.nsec) / NSEC_PER_USEC;
+ ret->otime = (usec_t) le64toh(ri->otime.sec) * USEC_PER_SEC +
+ (usec_t) le32toh(ri->otime.nsec) / NSEC_PER_USEC;
- ret->subvol_id = subvol_id;
- ret->read_only = !!(le64toh(ri->flags) & BTRFS_ROOT_SUBVOL_RDONLY);
+ ret->subvol_id = subvol_id;
+ ret->read_only = !!(le64toh(ri->flags) & BTRFS_ROOT_SUBVOL_RDONLY);
- assert_cc(sizeof(ri->uuid) == sizeof(ret->uuid));
- memcpy(&ret->uuid, ri->uuid, sizeof(ret->uuid));
- memcpy(&ret->parent_uuid, ri->parent_uuid, sizeof(ret->parent_uuid));
+ assert_cc(sizeof(ri->uuid) == sizeof(ret->uuid));
+ memcpy(&ret->uuid, ri->uuid, sizeof(ret->uuid));
+ memcpy(&ret->parent_uuid, ri->parent_uuid, sizeof(ret->parent_uuid));
+
+ found = true;
+ goto finish;
+ }
+
+ args.key.min_offset++;
+ if (!args.key.min_offset) /* overflow */
+ break;
+ }
+
+finish:
+ if (!found)
+ return -ENODATA;
+
+ return 0;
+}
+
+int btrfs_subvol_get_quota_fd(int fd, BtrfsQuotaInfo *ret) {
+
+ struct btrfs_ioctl_search_args args = {
+ /* Tree of quota items */
+ .key.tree_id = BTRFS_QUOTA_TREE_OBJECTID,
+
+ /* Look precisely for the quota items */
+ .key.min_type = BTRFS_QGROUP_STATUS_KEY,
+ .key.max_type = BTRFS_QGROUP_LIMIT_KEY,
+
+ .key.min_objectid = 0,
+ .key.max_objectid = 0,
+
+ /* No restrictions on the other components */
+ .key.min_transid = 0,
+ .key.max_transid = (uint64_t) -1,
+ };
+
+ uint64_t subvol_id;
+ bool found_info = false, found_limit = false;
+ int r;
+
+ assert(fd >= 0);
+ assert(ret);
+
+ r = btrfs_subvol_get_id_fd(fd, &subvol_id);
+ if (r < 0)
+ return r;
+
+ args.key.min_offset = args.key.max_offset = subvol_id;
+
+ for (;;) {
+ const struct btrfs_ioctl_search_header *sh;
+ unsigned i;
+
+ args.key.nr_items = 256;
+ if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
+ return -errno;
+
+ if (args.key.nr_items <= 0)
+ break;
+
+ for (i = 0,
+ sh = (const struct btrfs_ioctl_search_header*) args.buf;
+ i < args.key.nr_items;
+ i++,
+ args.key.min_type = sh->type,
+ args.key.min_offset = sh->offset,
+ args.key.min_objectid = sh->objectid,
+ sh = (const struct btrfs_ioctl_search_header*) ((uint8_t*) sh + sizeof(struct btrfs_ioctl_search_header) + sh->len)) {
+
+ const void *body;
+
+ if (sh->objectid != 0)
+ continue;
+ if (sh->offset != subvol_id)
+ continue;
+
+ body = (uint8_t*) sh + sizeof(struct btrfs_ioctl_search_header);
+
+ if (sh->type == BTRFS_QGROUP_INFO_KEY) {
+ const struct btrfs_qgroup_info_item *qii = body;
+
+ ret->referred = le64toh(qii->rfer);
+ ret->exclusive = le64toh(qii->excl);
+
+ found_info = true;
+
+ } else if (sh->type == BTRFS_QGROUP_LIMIT_KEY) {
+ const struct btrfs_qgroup_limit_item *qli = body;
+
+ ret->referred_max = le64toh(qli->max_rfer);
+ ret->exclusive_max = le64toh(qli->max_excl);
+
+ if (ret->referred_max == 0)
+ ret->referred_max = (uint64_t) -1;
+ if (ret->exclusive_max == 0)
+ ret->exclusive_max = (uint64_t) -1;
+
+ found_limit = true;
+ }
+
+ if (found_info && found_limit)
+ goto finish;
+ }
+
+ args.key.min_offset++;
+ if (!args.key.min_offset)
+ break;
+ }
+
+finish:
+ if (!found_limit && !found_info)
+ return -ENODATA;
+
+ if (!found_info) {
+ ret->referred = (uint64_t) -1;
+ ret->exclusive = (uint64_t) -1;
+ }
+
+ if (!found_limit) {
+ ret->referred_max = (uint64_t) -1;
+ ret->exclusive_max = (uint64_t) -1;
+ }
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-30 12:27:43 +0000