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 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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/syscall_types.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'linux-user/syscall_types.h') diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h index dab2c16bca..73e36620ce 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 */ -- cgit 1.4.1