Add 2 definitions of new unprivileged ioctl (BTRFS_IOC_GET_SUBVOL_INFO
and BTRFS_IOC_INO_LOOKUP_USER). They will be used to implement
user version of "btrfs subvolume list" etc.
Signed-off-by: Tomohiro Misono <misono.tomoh...@jp.fujitsu.com>
---
ioctl.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/ioctl.h b/ioctl.h
index 709e996f..c5181dd9 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -320,6 +320,21 @@ struct btrfs_ioctl_ino_lookup_args {
};
BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_lookup_args) == 4096);
+#define BTRFS_INO_LOOKUP_USER_PATH_MAX (4072-BTRFS_VOL_NAME_MAX)
+struct btrfs_ioctl_ino_lookup_user_args {
+ /* in */
+ __u64 treeid;
+ /* in, 'dirid' is the same as objectid in btrfs_ioctl_ino_lookup_args */
+ __u64 dirid;
+ /* in, subvolume id */
+ __u64 subid;
+ /* out, name of the subvolume whose objectid is 'subid' */
+ char name[BTRFS_VOL_NAME_MAX];
+ /* out, 'path' is the same as 'name' in btrfs_ioctl_ino_lookup_args */
+ char path[BTRFS_INO_LOOKUP_USER_PATH_MAX];
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_lookup_user_args) == 4096);
+
struct btrfs_ioctl_search_key {
/* which root are we searching. 0 is the tree of tree roots */
__u64 tree_id;
@@ -828,6 +843,10 @@ static inline char *btrfs_err_str(enum btrfs_err_code
err_code)
struct btrfs_ioctl_feature_flags[3])
#define BTRFS_IOC_RM_DEV_V2 _IOW(BTRFS_IOCTL_MAGIC, 58, \
struct btrfs_ioctl_vol_args_v2)
+#define BTRFS_IOC_GET_SUBVOL_INFO _IOWR(BTRFS_IOCTL_MAGIC, 60, \
+ struct btrfs_ioctl_search_args)
+#define BTRFS_IOC_INO_LOOKUP_USER _IOWR(BTRFS_IOCTL_MAGIC, 61, \
+ struct btrfs_ioctl_ino_lookup_args)
#ifdef __cplusplus
}
#endif
--
2.14.3
--
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