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[PULL 6/8] linux-user: Add support for two btrfs ioctls used for subvolu
From: |
Laurent Vivier |
Subject: |
[PULL 6/8] linux-user: Add support for two btrfs ioctls used for subvolume |
Date: |
Mon, 31 Aug 2020 13:07:14 +0200 |
From: Filip Bozuta <Filip.Bozuta@syrmia.com>
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.Bozuta@syrmia.com>
Tested-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200823195014.116226-7-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/ioctls.h | 7 +++++++
linux-user/syscall_defs.h | 3 +++
linux-user/syscall_types.h | 13 +++++++++++++
3 files changed, 23 insertions(+)
diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 23807513eed1..dc2f3d2413ed 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 4929121956c6..bb60c728d81a 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -1014,6 +1014,8 @@ struct target_rtc_pll_info {
#define TARGET_BTRFS_IOC_SUBVOL_CREATE TARGET_IOWU(BTRFS_IOCTL_MAGIC,
14)
#define TARGET_BTRFS_IOC_SNAP_DESTROY TARGET_IOWU(BTRFS_IOCTL_MAGIC,
15)
#define TARGET_BTRFS_IOC_INO_LOOKUP
TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 18)
+#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,
26,\
@@ -1027,6 +1029,7 @@ struct target_rtc_pll_info {
#define TARGET_BTRFS_IOC_GET_SUPPORTED_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC,
57)
#define TARGET_BTRFS_IOC_LOGICAL_INO_V2
TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 59)
#define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IORU(BTRFS_IOCTL_MAGIC,
60)
+#define TARGET_BTRFS_IOC_GET_SUBVOL_ROOTREF
TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 61)
#define TARGET_BTRFS_IOC_INO_LOOKUP_USER
TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 62)
/* usb ioctls */
diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index dab2c16bcac7..73e36620cedc 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -435,6 +435,19 @@ STRUCT(btrfs_ioctl_dev_info_args,
MK_ARRAY(TYPE_CHAR, BTRFS_DEVICE_PATH_NAME_MAX)) /* path */
#endif
+#ifdef BTRFS_IOC_GET_SUBVOL_ROOTREF
+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 */
+#endif
+
#ifdef BTRFS_IOC_GET_DEV_STATS
STRUCT(btrfs_ioctl_get_dev_stats,
TYPE_ULONGLONG, /* devid */
--
2.26.2
- [PULL 0/8] Linux user for 5.2 patches, Laurent Vivier, 2020/08/31
- [PULL 1/8] linux-user: Add support for a group of btrfs ioctls used for subvolumes, Laurent Vivier, 2020/08/31
- [PULL 2/8] linux-user: Add support for a group of btrfs ioctls used for snapshots, Laurent Vivier, 2020/08/31
- [PULL 3/8] linux-user: Add support for btrfs ioctls used to manipulate with devices, Laurent Vivier, 2020/08/31
- [PULL 5/8] linux-user: Add support for a group of btrfs inode ioctls, Laurent Vivier, 2020/08/31
- [PULL 4/8] linux-user: Add support for btrfs ioctls used to get/set features, Laurent Vivier, 2020/08/31
- [PULL 6/8] linux-user: Add support for two btrfs ioctls used for subvolume,
Laurent Vivier <=
- [PULL 7/8] linux-user: Add support for btrfs ioctls used to manage quota, Laurent Vivier, 2020/08/31
- [PULL 8/8] linux-user: Add support for btrfs ioctls used to scrub a filesystem, Laurent Vivier, 2020/08/31