From 5793eb73d4d6d37293c6ca95ed85414fcccb9662 Mon Sep 17 00:00:00 2001
From: Filip Bozuta <Filip.Bozuta@syrmia.com>
Date: Thu, 3 Sep 2020 01:26:57 +0200
Subject: [PATCH 5/9] linux-user: Add support for btrfs ioctls used to get/set
features
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This patch implements functionality for following ioctls:
BTRFS_IOC_GET_FEATURES - Getting feature flags
Read feature flags for a btrfs filesystem. The feature flags
are returned inside the ioctl's third argument which represents
a pointer to a following structure type:
struct btrfs_ioctl_feature_flags {
__u64 compat_flags;
__u64 compat_ro_flags;
__u64 incompat_flags;
};
All of the structure field represent bit masks that can be composed
of values which can be found on:
https://elixir.bootlin.com/linux/latest/source/fs/btrfs/ctree.h#L282
BTRFS_IOC_SET_FEATURES - Setting feature flags
Set and clear feature flags for a btrfs filesystem. The feature flags
are set using the ioctl's third argument which represents a
'struct btrfs_ioctl_feature_flags[2]' array. The first element of the
array represent flags which are to be cleared and the second element of
the array represent flags which are to be set. The second element has the
priority over the first, which means that if there are matching flags
in the elements, they will be set in the filesystem. If the flag values
in the third argument aren't correctly set to be composed of the available
predefined flag values, errno ENOPERM ("Operation not permitted") is returned.
BTRFS_IOC_GET_SUPPORTED_FEATURES - Getting supported feature flags
Read supported feature flags for a btrfs filesystem. The supported
feature flags are read using the ioctl's third argument which represents
a 'struct btrfs_ioctl_feature_flags[3]' array. The first element of this
array represents all of the supported flags in the btrfs filesystem.
The second element represents flags that can be safely set and third element
represent flags that can be safely clearead.
Implementation notes:
All of the implemented ioctls use 'struct btrfs_ioctl_feature_flags' as
third argument. That is the reason why a corresponding defintion was added
in file 'linux-user/syscall_types.h'.
Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Tested-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200823195014.116226-5-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/ioctls.h | 12 ++++++++++++
linux-user/syscall_defs.h | 3 +++
linux-user/syscall_types.h | 5 +++++
3 files changed, 20 insertions(+)
diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 55a6cbeca5..50fae1e33b 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -216,6 +216,18 @@
IOCTL(BTRFS_IOC_GET_DEV_STATS, IOC_RW,
MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_dev_stats)))
#endif
+#ifdef BTRFS_IOC_GET_FEATURES
+ IOCTL(BTRFS_IOC_GET_FEATURES, IOC_R,
+ MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_feature_flags)))
+#endif
+#ifdef BTRFS_IOC_SET_FEATURES
+ IOCTL(BTRFS_IOC_SET_FEATURES, IOC_W,
+ MK_PTR(MK_ARRAY(MK_STRUCT(STRUCT_btrfs_ioctl_feature_flags), 2)))
+#endif
+#ifdef BTRFS_IOC_GET_SUPPORTED_FEATURES
+ IOCTL(BTRFS_IOC_GET_SUPPORTED_FEATURES, IOC_R,
+ MK_PTR(MK_ARRAY(MK_STRUCT(STRUCT_btrfs_ioctl_feature_flags), 3)))
+#endif
#ifdef BTRFS_IOC_GET_SUBVOL_INFO
IOCTL(BTRFS_IOC_GET_SUBVOL_INFO, IOC_R,
MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_info_args)))
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 4c7bfa0391..44811fdcbb 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -981,6 +981,9 @@ struct target_rtc_pll_info {
abi_ullong)
#define TARGET_BTRFS_IOC_DEV_INFO TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 30)
#define TARGET_BTRFS_IOC_GET_DEV_STATS TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 52)
+#define TARGET_BTRFS_IOC_GET_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC, 57)
+#define TARGET_BTRFS_IOC_SET_FEATURES TARGET_IOWU(BTRFS_IOCTL_MAGIC, 57)
+#define TARGET_BTRFS_IOC_GET_SUPPORTED_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC, 57)
#define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IORU(BTRFS_IOCTL_MAGIC, 60)
/* usb ioctls */
diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index ea6898979b..925054cfd4 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -409,6 +409,11 @@ STRUCT(btrfs_ioctl_get_dev_stats,
128 - 2 - BTRFS_DEV_STAT_VALUES_MAX)) /* unused */
#endif
+STRUCT(btrfs_ioctl_feature_flags,
+ TYPE_ULONGLONG, /* compat_flags */
+ TYPE_ULONGLONG, /* compat_ro_flags */
+ TYPE_ULONGLONG) /* incompat_flags */
+
STRUCT(rtc_time,
TYPE_INT, /* tm_sec */
TYPE_INT, /* tm_min */
--
2.26.2