Add 3 definitions of new unprivileged ioctl (BTRFS_IOC_GET_SUBVOL_INFO,
BTRFS_IOC_GET_SUBVOL_ROOTREF 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 | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
diff --git a/ioctl.h b/ioctl.h
index 709e996f..c6624352 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -320,6 +320,22 @@ struct btrfs_ioctl_ino_lookup_args {
};
BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_lookup_args) == 4096);
+#define BTRFS_INO_LOOKUP_USER_PATH_MAX (4080-BTRFS_VOL_NAME_MAX-1)
+struct btrfs_ioctl_ino_lookup_user_args {
+ /* in, inode number containing the subvolume of 'subvolid' */
+ __u64 dirid;
+ /* in */
+ __u64 subvolid;
+ /* out, name of the subvolume of 'subvolid' */
+ char name[BTRFS_VOL_NAME_MAX + 1];
+ /*
+ * out, constructed path from the directory with which
+ * the ioctl is called to dirid
+ */
+ 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;
@@ -672,6 +688,70 @@ BUILD_ASSERT(sizeof(struct btrfs_ioctl_send_args_64) ==
72);
#define BTRFS_IOC_SEND_64_COMPAT_DEFINED 1
+struct btrfs_ioctl_get_subvol_info_args {
+ /* All filed is out */
+ /* Id of this subvolume */
+ __u64 id;
+ /* Name of this subvolume, used to get the real name at mount point */
+ char name[BTRFS_VOL_NAME_MAX + 1];
+ /*
+ * Id of the subvolume which contains this subvolume.
+ * Zero for top-level subvolume or deleted subvolume
+ */
+ __u64 parent_id;
+ /*
+ * Inode number of the directory which contains this subvolume.
+ * Zero for top-level subvolume or deleted subvolume
+ */
+ __u64 dirid;
+
+ /* Latest transaction id of this subvolume */
+ __u64 generation;
+ /* Flags of this subvolume */
+ __u64 flags;
+
+ /* uuid of this subvolume */
+ __u8 uuid[BTRFS_UUID_SIZE];
+ /*
+ * uuid of the subvolume of which this subvolume is a snapshot.
+ * All zero for non-snapshot subvolume
+ */
+ __u8 parent_uuid[BTRFS_UUID_SIZE];
+ /*
+ * uuid of the subvolume from which this subvolume is received.
+ * All zero for non-received subvolume
+ */
+ __u8 received_uuid[BTRFS_UUID_SIZE];
+
+ /* Transaction id indicates when change/create/send/receive happens */
+ __u64 ctransid;
+ __u64 otransid;
+ __u64 stransid;
+ __u64 rtransid;
+ /* Time corresponds to c/o/s/rtransid */
+ struct btrfs_ioctl_timespec ctime;
+ struct btrfs_ioctl_timespec otime;
+ struct btrfs_ioctl_timespec stime;
+ struct btrfs_ioctl_timespec rtime;
+
+ __u64 reserved[8];
+};
+
+#define BTRFS_MAX_ROOTREF_BUFFER_NUM 255
+struct btrfs_ioctl_get_subvol_rootref_args {
+ /* in/out, min id of rootref's subvolid to be searched */
+ __u64 min_id;
+ /* out */
+ struct {
+ __u64 subvolid;
+ __u64 dirid;
+ } rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM];
+ /* out, number of found items */
+ __u8 num_items;
+ __u8 align[7];
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_get_subvol_rootref_args) == 4096);
+
/* Error codes as returned by the kernel */
enum btrfs_err_code {
notused,
@@ -828,6 +908,12 @@ 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 _IOR(BTRFS_IOCTL_MAGIC, 60, \
+ struct btrfs_ioctl_get_subvol_info_args)
+#define BTRFS_IOC_GET_SUBVOL_ROOTREF _IOWR(BTRFS_IOCTL_MAGIC, 61, \
+ struct btrfs_ioctl_get_subvol_rootref_args)
+#define BTRFS_IOC_INO_LOOKUP_USER _IOWR(BTRFS_IOCTL_MAGIC, 62, \
+ struct btrfs_ioctl_ino_lookup_user_args)
#ifdef __cplusplus
}
#endif
--
2.14.3
--
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