This patch implements functionality for following ioctl:
BTRFS_IOC_DEFAULT_SUBVOL - Setting a default subvolume
Set a default subvolume for a btrfs filesystem. The third
ioctl's argument is a '__u64' (unsigned long long) which
represents the id of a subvolume that is to be set as
the default.
BTRFS_IOC_GET_SUBVOL_ROOTREF - Getting tree and directory id of subvolumes
Read tree and directory id of subvolumes from a btrfs
filesystem. The tree and directory id's are returned in the
ioctl's third argument which represents a pointer to a
following type:
struct btrfs_ioctl_get_subvol_rootref_args {
/* in/out, minimum id of rootref's treeid to be searched */
__u64 min_treeid;
/* out */
struct {
__u64 treeid;
__u64 dirid;
} rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM];
/* out, number of found items */
__u8 num_items;
__u8 align[7];
};
Before calling this ioctl, 'min_treeid' field should be filled
with value that represent the minimum value for the tree id.
Implementation notes:
Ioctl BTRFS_IOC_GET_SUBVOL_ROOTREF uses the above mentioned structure
type as third argument. That is the reason why a aproppriate thunk
structure definition is added in file 'syscall_types.h'.
Signed-off-by: Filip Bozuta <filip.boz...@syrmia.com>
---
linux-user/ioctls.h | 7 +++++++
linux-user/syscall_defs.h | 4 ++++
linux-user/syscall_types.h | 11 +++++++++++
3 files changed, 22 insertions(+)
diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index a7f5664487..2c553103e6 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -206,6 +206,9 @@
IOCTL(BTRFS_IOC_INO_LOOKUP, IOC_RW,
MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_args)))
#endif
+#ifdef BTRFS_IOC_DEFAULT_SUBVOL
+ IOCTL(BTRFS_IOC_DEFAULT_SUBVOL, IOC_W, MK_PTR(TYPE_ULONGLONG))
+#endif
#ifdef BTRFS_IOC_SUBVOL_GETFLAGS
IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG))
#endif
@@ -248,6 +251,10 @@
IOCTL(BTRFS_IOC_GET_SUBVOL_INFO, IOC_R,
MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_info_args)))
#endif
+#ifdef BTRFS_IOC_GET_SUBVOL_ROOTREF
+ IOCTL(BTRFS_IOC_GET_SUBVOL_ROOTREF, IOC_RW,
+ MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_rootref_args)))
+#endif
#ifdef BTRFS_IOC_INO_LOOKUP_USER
IOCTL(BTRFS_IOC_INO_LOOKUP_USER, IOC_RW,
MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_user_args)))
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 7bb105428b..f4b4fc4a20 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -984,6 +984,8 @@ struct target_rtc_pll_info {
15, struct btrfs_ioctl_vol_args)
#define TARGET_BTRFS_IOC_INO_LOOKUP TARGET_IOWR(BTRFS_IOCTL_MAGIC,\
18, struct btrfs_ioctl_ino_lookup_args)
+#define TARGET_BTRFS_IOC_DEFAULT_SUBVOL TARGET_IOW(BTRFS_IOCTL_MAGIC, \
+ 19, abi_ullong)
#define TARGET_BTRFS_IOC_SUBVOL_GETFLAGS TARGET_IOR(BTRFS_IOCTL_MAGIC, \
25, abi_ullong)
#define TARGET_BTRFS_IOC_SUBVOL_SETFLAGS TARGET_IOW(BTRFS_IOCTL_MAGIC, \
@@ -1006,6 +1008,8 @@ struct target_rtc_pll_info {
59, struct btrfs_ioctl_logical_ino_args)
#define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IOR(BTRFS_IOCTL_MAGIC, \
60, struct btrfs_ioctl_get_subvol_info_args)
+#define TARGET_BTRFS_IOC_GET_SUBVOL_ROOTREF TARGET_IOWR(BTRFS_IOCTL_MAGIC,\
+ 61, struct btrfs_ioctl_get_subvol_rootref_args)
#define TARGET_BTRFS_IOC_INO_LOOKUP_USER TARGET_IOWR(BTRFS_IOCTL_MAGIC,\
62, struct btrfs_ioctl_ino_lookup_user_args)
diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index 980c29000a..d2f1b30ff3 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -381,6 +381,17 @@ STRUCT(btrfs_ioctl_dev_info_args,
MK_ARRAY(TYPE_ULONGLONG, 379), /* unused */
MK_ARRAY(TYPE_CHAR, BTRFS_DEVICE_PATH_NAME_MAX)) /* path */
+STRUCT(rootref,
+ TYPE_ULONGLONG, /* treeid */
+ TYPE_ULONGLONG) /* dirid */
+
+STRUCT(btrfs_ioctl_get_subvol_rootref_args,
+ TYPE_ULONGLONG, /* min_treeid */
+ MK_ARRAY(MK_STRUCT(STRUCT_rootref),
+ BTRFS_MAX_ROOTREF_BUFFER_NUM), /* rootref */
+ TYPE_CHAR, /* num_items */
+ MK_ARRAY(TYPE_CHAR, 7)) /* align */
+
STRUCT(btrfs_ioctl_get_dev_stats,
TYPE_ULONGLONG, /* devid */
TYPE_ULONGLONG, /* nr_items */
--
2.25.1
