117 lines
4.8 KiB
Diff
117 lines
4.8 KiB
Diff
From: Filip Bozuta <Filip.Bozuta@syrmia.com>
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Date: Thu, 3 Sep 2020 01:26:57 +0200
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Subject: [PATCH] linux-user: Add support for btrfs ioctls used to get/set
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features
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MIME-Version: 1.0
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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 for following ioctls:
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BTRFS_IOC_GET_FEATURES - Getting feature flags
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Read feature flags for a btrfs filesystem. The feature flags
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are returned inside the ioctl's third argument which represents
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a pointer to a following structure type:
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struct btrfs_ioctl_feature_flags {
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__u64 compat_flags;
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__u64 compat_ro_flags;
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__u64 incompat_flags;
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};
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All of the structure field represent bit masks that can be composed
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of values which can be found on:
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https://elixir.bootlin.com/linux/latest/source/fs/btrfs/ctree.h#L282
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BTRFS_IOC_SET_FEATURES - Setting feature flags
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Set and clear feature flags for a btrfs filesystem. The feature flags
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are set using the ioctl's third argument which represents a
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'struct btrfs_ioctl_feature_flags[2]' array. The first element of the
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array represent flags which are to be cleared and the second element of
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the array represent flags which are to be set. The second element has the
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priority over the first, which means that if there are matching flags
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in the elements, they will be set in the filesystem. If the flag values
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in the third argument aren't correctly set to be composed of the available
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predefined flag values, errno ENOPERM ("Operation not permitted") is returned.
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BTRFS_IOC_GET_SUPPORTED_FEATURES - Getting supported feature flags
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Read supported feature flags for a btrfs filesystem. The supported
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feature flags are read using the ioctl's third argument which represents
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a 'struct btrfs_ioctl_feature_flags[3]' array. The first element of this
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array represents all of the supported flags in the btrfs filesystem.
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The second element represents flags that can be safely set and third element
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represent flags that can be safely clearead.
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Implementation notes:
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All of the implemented ioctls use 'struct btrfs_ioctl_feature_flags' as
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third argument. That is the reason why a corresponding defintion was added
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in file 'linux-user/syscall_types.h'.
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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: <20200823195014.116226-5-Filip.Bozuta@syrmia.com>
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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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---
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linux-user/ioctls.h | 12 ++++++++++++
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linux-user/syscall_defs.h | 3 +++
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linux-user/syscall_types.h | 5 +++++
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3 files changed, 20 insertions(+)
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diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
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index 55a6cbeca5..50fae1e33b 100644
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--- a/linux-user/ioctls.h
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+++ b/linux-user/ioctls.h
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@@ -216,6 +216,18 @@
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IOCTL(BTRFS_IOC_GET_DEV_STATS, IOC_RW,
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MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_dev_stats)))
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#endif
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+#ifdef BTRFS_IOC_GET_FEATURES
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+ IOCTL(BTRFS_IOC_GET_FEATURES, IOC_R,
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+ MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_feature_flags)))
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+#endif
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+#ifdef BTRFS_IOC_SET_FEATURES
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+ IOCTL(BTRFS_IOC_SET_FEATURES, IOC_W,
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+ MK_PTR(MK_ARRAY(MK_STRUCT(STRUCT_btrfs_ioctl_feature_flags), 2)))
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+#endif
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+#ifdef BTRFS_IOC_GET_SUPPORTED_FEATURES
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+ IOCTL(BTRFS_IOC_GET_SUPPORTED_FEATURES, IOC_R,
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+ MK_PTR(MK_ARRAY(MK_STRUCT(STRUCT_btrfs_ioctl_feature_flags), 3)))
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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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diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
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index 4c7bfa0391..44811fdcbb 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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@@ -981,6 +981,9 @@ struct target_rtc_pll_info {
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abi_ullong)
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#define TARGET_BTRFS_IOC_DEV_INFO TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 30)
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#define TARGET_BTRFS_IOC_GET_DEV_STATS TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 52)
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+#define TARGET_BTRFS_IOC_GET_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC, 57)
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+#define TARGET_BTRFS_IOC_SET_FEATURES TARGET_IOWU(BTRFS_IOCTL_MAGIC, 57)
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+#define TARGET_BTRFS_IOC_GET_SUPPORTED_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC, 57)
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#define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IORU(BTRFS_IOCTL_MAGIC, 60)
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/* usb ioctls */
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diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
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index ea6898979b..925054cfd4 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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@@ -409,6 +409,11 @@ STRUCT(btrfs_ioctl_get_dev_stats,
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128 - 2 - BTRFS_DEV_STAT_VALUES_MAX)) /* unused */
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#endif
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+STRUCT(btrfs_ioctl_feature_flags,
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+ TYPE_ULONGLONG, /* compat_flags */
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+ TYPE_ULONGLONG, /* compat_ro_flags */
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+ TYPE_ULONGLONG) /* incompat_flags */
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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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