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From e0eab99255d34c9dbaac7b73a1a2a79f823a7da9 Mon Sep 17 00:00:00 2001
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From: Filip Bozuta <Filip.Bozuta@syrmia.com>
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Date: Thu, 3 Sep 2020 01:26:54 +0200
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Subject: [PATCH 2/9] linux-user: Add support for a group of btrfs ioctls used
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 for subvolumes
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This patch implements functionality of following ioctls:
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BTRFS_IOC_SUBVOL_CREATE - Creating a btrfs subvolume
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    Create a btrfs subvolume. The subvolume is created using the ioctl's
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    third argument which represents a pointer to a following structure
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    type:
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    struct btrfs_ioctl_vol_args {
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	__s64 fd;
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	char name[BTRFS_PATH_NAME_MAX + 1];
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    };
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    Before calling this ioctl, the fields of this structure should be filled
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    with aproppriate values. The fd field represents the file descriptor
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    value of the subvolume and the name field represents the subvolume
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    path.
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BTRFS_IOC_SUBVOL_GETFLAGS - Getting subvolume flags
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    Read the flags of the btrfs subvolume. The flags are read using
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    the ioctl's third argument that is a pointer of __u64 (unsigned long).
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    The third argument represents a bit mask that can be composed of following
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    values:
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    BTRFS_SUBVOL_RDONLY           (1ULL << 1)
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    BTRFS_SUBVOL_QGROUP_INHERIT   (1ULL << 2)
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    BTRFS_DEVICE_SPEC_BY_ID       (1ULL << 3)
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    BTRFS_SUBVOL_SPEC_BY_ID       (1ULL << 4)
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BTRFS_IOC_SUBVOL_SETFLAGS - Setting subvolume flags
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    Set the flags of the btrfs subvolume. The flags are set using the
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    ioctl's third argument that is a pointer of __u64 (unsigned long).
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    The third argument represents a bit mask that can be composed of same
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    values as in the case of previous ioctl (BTRFS_IOC_SUBVOL_GETFLAGS).
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BTRFS_IOC_SUBVOL_GETINFO - Getting subvolume information
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    Read information about the subvolume. The subvolume information is
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    returned in the ioctl's third argument which represents a pointer to
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    a following structure type:
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    struct btrfs_ioctl_get_subvol_info_args {
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	/* Id of this subvolume */
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	__u64 treeid;
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	/* Name of this subvolume, used to get the real name at mount point */
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	char name[BTRFS_VOL_NAME_MAX + 1];
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	/*
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	 * Id of the subvolume which contains this subvolume.
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	 * Zero for top-level subvolume or a deleted subvolume.
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	 */
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	__u64 parent_id;
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	/*
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	 * Inode number of the directory which contains this subvolume.
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	 * Zero for top-level subvolume or a deleted subvolume
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	 */
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	__u64 dirid;
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	/* Latest transaction id of this subvolume */
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	__u64 generation;
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	/* Flags of this subvolume */
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	__u64 flags;
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	/* UUID of this subvolume */
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	__u8 uuid[BTRFS_UUID_SIZE];
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	/*
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	 * UUID of the subvolume of which this subvolume is a snapshot.
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	 * All zero for a non-snapshot subvolume.
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	 */
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	__u8 parent_uuid[BTRFS_UUID_SIZE];
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	/*
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	 * UUID of the subvolume from which this subvolume was received.
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	 * All zero for non-received subvolume.
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	 */
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	__u8 received_uuid[BTRFS_UUID_SIZE];
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	/* Transaction id indicating when change/create/send/receive happened */
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	__u64 ctransid;
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	__u64 otransid;
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	__u64 stransid;
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	__u64 rtransid;
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	/* Time corresponding to c/o/s/rtransid */
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	struct btrfs_ioctl_timespec ctime;
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	struct btrfs_ioctl_timespec otime;
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	struct btrfs_ioctl_timespec stime;
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	struct btrfs_ioctl_timespec rtime;
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	/* Must be zero */
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	__u64 reserved[8];
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     };
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     All of the fields of this structure are filled after the ioctl call.
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Implementation notes:
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    Ioctls BTRFS_IOC_SUBVOL_CREATE and BTRFS_IOC_SUBVOL_GETINFO have structure
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    types as third arguments. That is the reason why a corresponding definition
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    are added in file 'linux-user/syscall_types.h'.
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    The line '#include <linux/btrfs.h>' is added in file 'linux-user/syscall.c' to
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    recognise preprocessor definitions for these ioctls. Since the file "linux/btrfs.h"
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    was added in the kernel version 3.9, it is enwrapped in an #ifdef statement
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    with parameter CONFIG_BTRFS which is defined in 'configure' if the
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    header file is present.
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Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
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Tested-by: Daniel P. Berrangé <berrange@redhat.com>
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Message-Id: <20200823195014.116226-2-Filip.Bozuta@syrmia.com>
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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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---
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 configure                  |  9 +++++++++
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 linux-user/ioctls.h        | 15 +++++++++++++++
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 linux-user/syscall.c       |  3 +++
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 linux-user/syscall_defs.h  |  8 ++++++++
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 linux-user/syscall_types.h | 32 ++++++++++++++++++++++++++++++++
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 5 files changed, 67 insertions(+)
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diff --git a/configure b/configure
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index 2acc4d1465..1cba4e0b80 100755
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--- a/configure
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+++ b/configure
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@@ -5079,6 +5079,12 @@ if check_include sys/kcov.h ; then
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     kcov=yes
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 fi
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+# check for btrfs filesystem support (kernel must be 3.9+)
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+btrfs=no
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+if check_include linux/btrfs.h ; then
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+    btrfs=yes
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+fi
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+
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 # If we're making warnings fatal, apply this to Sphinx runs as well
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 sphinx_werror=""
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 if test "$werror" = "yes"; then
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@@ -7330,6 +7336,9 @@ fi
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 if test "$kcov" = "yes" ; then
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   echo "CONFIG_KCOV=y" >> $config_host_mak
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 fi
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+if test "$btrfs" = "yes" ; then
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+  echo "CONFIG_BTRFS=y" >> $config_host_mak
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+fi
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 if test "$inotify" = "yes" ; then
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   echo "CONFIG_INOTIFY=y" >> $config_host_mak
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 fi
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diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
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index 0713ae1311..12d1444224 100644
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--- a/linux-user/ioctls.h
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+++ b/linux-user/ioctls.h
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@@ -174,6 +174,21 @@
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      IOCTL(FS_IOC32_GETVERSION, IOC_R, MK_PTR(TYPE_INT))
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      IOCTL(FS_IOC32_SETVERSION, IOC_W, MK_PTR(TYPE_INT))
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+#ifdef BTRFS_IOC_SUBVOL_CREATE
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+     IOCTL(BTRFS_IOC_SUBVOL_CREATE, IOC_W,
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+           MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args)))
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+#endif
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+#ifdef BTRFS_IOC_SUBVOL_GETFLAGS
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+     IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG))
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+#endif
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+#ifdef BTRFS_IOC_SUBVOL_SETFLAGS
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+     IOCTL(BTRFS_IOC_SUBVOL_SETFLAGS, IOC_W, MK_PTR(TYPE_ULONGLONG))
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+#endif
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+#ifdef BTRFS_IOC_GET_SUBVOL_INFO
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+     IOCTL(BTRFS_IOC_GET_SUBVOL_INFO, IOC_R,
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+           MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_info_args)))
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+#endif
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+
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 #ifdef CONFIG_USBFS
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   /* USB ioctls */
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   IOCTL(USBDEVFS_CONTROL, IOC_RW,
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diff --git a/linux-user/syscall.c b/linux-user/syscall.c
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index 945fc25279..36777c91b0 100644
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--- a/linux-user/syscall.c
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+++ b/linux-user/syscall.c
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@@ -112,6 +112,9 @@
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 #include <linux/if_alg.h>
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 #include <linux/rtc.h>
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 #include <sound/asound.h>
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+#ifdef CONFIG_BTRFS
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+#include <linux/btrfs.h>
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+#endif
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 #ifdef HAVE_DRM_H
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 #include <libdrm/drm.h>
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 #endif
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diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
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index 3c261cff0e..2757956dfa 100644
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--- a/linux-user/syscall_defs.h
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+++ b/linux-user/syscall_defs.h
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@@ -967,6 +967,14 @@ struct target_rtc_pll_info {
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 #define TARGET_FS_IOC32_GETVERSION TARGET_IOR('v', 1, int)
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 #define TARGET_FS_IOC32_SETVERSION TARGET_IOW('v', 2, int)
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+/* btrfs ioctls */
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+#define TARGET_BTRFS_IOC_SUBVOL_CREATE          TARGET_IOWU(BTRFS_IOCTL_MAGIC, 14)
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+#define TARGET_BTRFS_IOC_SUBVOL_GETFLAGS        TARGET_IOR(BTRFS_IOCTL_MAGIC, 25,\
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+                                                           abi_ullong)
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+#define TARGET_BTRFS_IOC_SUBVOL_SETFLAGS        TARGET_IOW(BTRFS_IOCTL_MAGIC, 26,\
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+                                                           abi_ullong)
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+#define TARGET_BTRFS_IOC_GET_SUBVOL_INFO        TARGET_IORU(BTRFS_IOCTL_MAGIC, 60)
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+
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 /* usb ioctls */
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 #define TARGET_USBDEVFS_CONTROL TARGET_IOWRU('U', 0)
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 #define TARGET_USBDEVFS_BULK TARGET_IOWRU('U', 2)
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diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
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index 3f1f033464..db61dbc1b3 100644
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--- a/linux-user/syscall_types.h
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+++ b/linux-user/syscall_types.h
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@@ -354,6 +354,38 @@ STRUCT(blkpg_partition,
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        MK_ARRAY(TYPE_CHAR, BLKPG_DEVNAMELTH), /* devname */
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        MK_ARRAY(TYPE_CHAR, BLKPG_VOLNAMELTH)) /* volname */
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+#ifdef BTRFS_IOC_SUBVOL_CREATE
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+STRUCT(btrfs_ioctl_vol_args,
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+       TYPE_LONGLONG, /* fd */
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+       MK_ARRAY(TYPE_CHAR, BTRFS_PATH_NAME_MAX + 1)) /* name */
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+#endif
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+
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+#ifdef BTRFS_IOC_GET_SUBVOL_INFO
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+STRUCT(btrfs_ioctl_timespec,
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+       TYPE_ULONGLONG, /* sec */
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+       TYPE_INT) /* nsec */
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+
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+STRUCT(btrfs_ioctl_get_subvol_info_args,
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+       TYPE_ULONGLONG, /* treeid */
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+       MK_ARRAY(TYPE_CHAR, BTRFS_VOL_NAME_MAX + 1),
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+       TYPE_ULONGLONG, /* parentid */
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+       TYPE_ULONGLONG, /* dirid */
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+       TYPE_ULONGLONG, /* generation */
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+       TYPE_ULONGLONG, /* flags */
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+       MK_ARRAY(TYPE_CHAR, BTRFS_UUID_SIZE), /* uuid */
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+       MK_ARRAY(TYPE_CHAR, BTRFS_UUID_SIZE), /* parent_uuid */
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+       MK_ARRAY(TYPE_CHAR, BTRFS_UUID_SIZE), /* received_uuid */
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+       TYPE_ULONGLONG, /* ctransid */
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+       TYPE_ULONGLONG, /* otransid */
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+       TYPE_ULONGLONG, /* stransid */
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+       TYPE_ULONGLONG, /* rtransid */
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+       MK_STRUCT(STRUCT_btrfs_ioctl_timespec), /* ctime */
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+       MK_STRUCT(STRUCT_btrfs_ioctl_timespec), /* otime */
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+       MK_STRUCT(STRUCT_btrfs_ioctl_timespec), /* stime */
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+       MK_STRUCT(STRUCT_btrfs_ioctl_timespec), /* rtime */
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+       MK_ARRAY(TYPE_ULONGLONG, 8)) /* reserved */
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+#endif
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+
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 STRUCT(rtc_time,
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        TYPE_INT, /* tm_sec */
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        TYPE_INT, /* tm_min */
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-- 
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2.26.2
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