From 784c08c8c4c069c8d7136ef39ef37b5ab33da97c Mon Sep 17 00:00:00 2001 From: Filip Bozuta Date: Sun, 23 Aug 2020 21:50:12 +0200 Subject: linux-user: Add support for two btrfs ioctls used for subvolume 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 Tested-by: Daniel P. Berrangé Message-Id: <20200823195014.116226-7-Filip.Bozuta@syrmia.com> Signed-off-by: Laurent Vivier --- linux-user/ioctls.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'linux-user/ioctls.h') diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h index 23807513ee..dc2f3d2413 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))) -- cgit v1.2.3-55-g7522