From 9bbd60e7f7c17bca78df2dfc2f1d6786db429328 Mon Sep 17 00:00:00 2001 From: Filip Bozuta Date: Sun, 23 Aug 2020 21:50:09 +0200 Subject: [PATCH] linux-user: Add support for btrfs ioctls used to manipulate with devices MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch implements functionality for following ioctls: BTRFS_IOC_SCAN_DEV - Scanning device for a btrfs filesystem Scan a device for a btrfs filesystem. The device that is to be scanned is passed in the ioctl's third argument which represents a pointer to a 'struct ioc_vol_args' (which was mentioned in a previous patch). Before calling this ioctl, the name field of this structure should be filled with the aproppriate name value which represents a path for the device. If the device contains a btrfs filesystem, the ioctl returns 0, otherwise a negative value is returned. BTRFS_IOC_ADD_DEV - Adding a device to a btrfs filesystem Add a device to a btrfs filesystem. The device that is to be added is passed in the ioctl's third argument which represents a pointer to a 'struct ioc_vol_args' (which was mentioned in a previous patch). Before calling this ioctl, the name field of this structure should be filled with the aproppriate name value which represents a path for the device. BTRFS_IOC_RM_DEV - Removing a device from a btrfs filesystem Remove a device from a btrfs filesystem. The device that is to be removed is passed in the ioctl's third argument which represents a pointer to a 'struct ioc_vol_args' (which was mentioned in a previous patch). Before calling this ioctl, the name field of this structure should be filled with the aproppriate name value which represents a path for the device. BTRFS_IOC_DEV_INFO - Getting information about a device Obtain information for device in a btrfs filesystem. The information is gathered in the ioctl's third argument which represents a pointer to a following structure type: struct btrfs_ioctl_dev_info_args { __u64 devid; /* in/out */ __u8 uuid[BTRFS_UUID_SIZE]; /* in/out */ __u64 bytes_used; /* out */ __u64 total_bytes; /* out */ __u64 unused[379]; /* pad to 4k */ __u8 path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */ }; Before calling this ioctl, field "devid" should be set with the id value for the device for which the information is to be obtained. If this field is not aproppriately set, the errno ENODEV ("No such device") is returned. BTRFS_IOC_GET_DEV_STATS - Getting device statistics Obtain stats informatin for device in a btrfs filesystem. The information is gathered in the ioctl's third argument which represents a pointer to a following structure type: struct btrfs_ioctl_get_dev_stats { __u64 devid; /* in */ __u64 nr_items; /* in/out */ __u64 flags; /* in/out */ /* out values: */ __u64 values[BTRFS_DEV_STAT_VALUES_MAX]; /* * This pads the struct to 1032 bytes. It was originally meant to pad to * 1024 bytes, but when adding the flags field, the padding calculation * was not adjusted. */ __u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; }; Before calling this ioctl, field "devid" should be set with the id value for the device for which the information is to be obtained. If this field is not aproppriately set, the errno ENODEV ("No such device") is returned. BTRFS_IOC_FORGET_DEV - Remove unmounted devices Search and remove all stale devices (devices which are not mounted). The third ioctl argument is a pointer to a 'struct btrfs_ioctl_vol_args'. The ioctl call will release all unmounted devices which match the path which is specified in the "name" field of the structure. If an empty path ("") is specified, all unmounted devices will be released. Implementation notes: Ioctls BTRFS_IOC_DEV_INFO and BTRFS_IOC_GET_DEV_STATS use types 'struct btrfs_ioctl_dev_info_args' and ' struct btrfs_ioctl_get_dev_stats' as third argument types. That is the reason why corresponding structure definitions were added in file 'linux-user/syscall_types.h'. Since the thunk type for 'struct ioc_vol_args' was already added in a previous patch, the rest of the implementation was straightforward. Signed-off-by: Filip Bozuta Tested-by: Daniel P. Berrangé Message-Id: <20200823195014.116226-4-Filip.Bozuta@syrmia.com> Signed-off-by: Laurent Vivier --- linux-user/ioctls.h | 24 ++++++++++++++++++++++++ linux-user/syscall_defs.h | 6 ++++++ linux-user/syscall_types.h | 24 +++++++++++++++++++++++- 3 files changed, 53 insertions(+), 1 deletion(-) diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h index bddeaca9e7..74d73994f6 100644 --- a/linux-user/ioctls.h +++ b/linux-user/ioctls.h @@ -178,6 +178,22 @@ IOCTL(BTRFS_IOC_SNAP_CREATE, IOC_W, MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args))) #endif +#ifdef BTRFS_IOC_SCAN_DEV + IOCTL(BTRFS_IOC_SCAN_DEV, IOC_W, + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args))) +#endif +#ifdef BTRFS_IOC_FORGET_DEV + IOCTL(BTRFS_IOC_FORGET_DEV, IOC_W, + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args))) +#endif +#ifdef BTRFS_IOC_ADD_DEV + IOCTL(BTRFS_IOC_ADD_DEV, IOC_W, + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args))) +#endif +#ifdef BTRFS_IOC_RM_DEV + IOCTL(BTRFS_IOC_RM_DEV, IOC_W, + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args))) +#endif #ifdef BTRFS_IOC_SUBVOL_CREATE IOCTL(BTRFS_IOC_SUBVOL_CREATE, IOC_W, MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args))) @@ -192,6 +208,14 @@ #ifdef BTRFS_IOC_SUBVOL_SETFLAGS IOCTL(BTRFS_IOC_SUBVOL_SETFLAGS, IOC_W, MK_PTR(TYPE_ULONGLONG)) #endif +#ifdef BTRFS_IOC_DEV_INFO + IOCTL(BTRFS_IOC_DEV_INFO, IOC_RW, + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_dev_info_args))) +#endif +#ifdef BTRFS_IOC_GET_DEV_STATS + IOCTL(BTRFS_IOC_GET_DEV_STATS, IOC_RW, + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_dev_stats))) +#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 1519de7a55..d11279b78b 100644 --- a/linux-user/syscall_defs.h +++ b/linux-user/syscall_defs.h @@ -1007,12 +1007,18 @@ struct target_rtc_pll_info { /* btrfs ioctls */ #define TARGET_BTRFS_IOC_SNAP_CREATE TARGET_IOWU(BTRFS_IOCTL_MAGIC, 1) +#define TARGET_BTRFS_IOC_SCAN_DEV TARGET_IOWU(BTRFS_IOCTL_MAGIC, 4) +#define TARGET_BTRFS_IOC_FORGET_DEV TARGET_IOWU(BTRFS_IOCTL_MAGIC, 5) +#define TARGET_BTRFS_IOC_ADD_DEV TARGET_IOWU(BTRFS_IOCTL_MAGIC, 10) +#define TARGET_BTRFS_IOC_RM_DEV TARGET_IOWU(BTRFS_IOCTL_MAGIC, 11) #define TARGET_BTRFS_IOC_SUBVOL_CREATE TARGET_IOWU(BTRFS_IOCTL_MAGIC, 14) #define TARGET_BTRFS_IOC_SNAP_DESTROY TARGET_IOWU(BTRFS_IOCTL_MAGIC, 15) #define TARGET_BTRFS_IOC_SUBVOL_GETFLAGS TARGET_IOR(BTRFS_IOCTL_MAGIC, 25,\ abi_ullong) #define TARGET_BTRFS_IOC_SUBVOL_SETFLAGS TARGET_IOW(BTRFS_IOCTL_MAGIC, 26,\ 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_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 853b91d212..7e52b7aec5 100644 --- a/linux-user/syscall_types.h +++ b/linux-user/syscall_types.h @@ -359,7 +359,9 @@ STRUCT(blkpg_partition, MK_ARRAY(TYPE_CHAR, BLKPG_VOLNAMELTH)) /* volname */ #if defined(BTRFS_IOC_SUBVOL_CREATE) || defined(BTRFS_IOC_SNAP_CREATE) || \ - defined(BTRFS_IOC_SNAP_DESTROY) + defined(BTRFS_IOC_SNAP_DESTROY) || defined(BTRFS_IOC_SCAN_DEV) || \ + defined(BTRFS_IOC_FORGET_DEV) || defined(BTRFS_IOC_ADD_DEV) || \ + defined(BTRFS_IOC_RM_DEV) || defined(BTRFS_IOC_DEV_INFO) STRUCT(btrfs_ioctl_vol_args, TYPE_LONGLONG, /* fd */ MK_ARRAY(TYPE_CHAR, BTRFS_PATH_NAME_MAX + 1)) /* name */ @@ -391,6 +393,26 @@ STRUCT(btrfs_ioctl_get_subvol_info_args, MK_ARRAY(TYPE_ULONGLONG, 8)) /* reserved */ #endif +#ifdef BTRFS_IOC_DEV_INFO +STRUCT(btrfs_ioctl_dev_info_args, + TYPE_ULONGLONG, /* devid */ + MK_ARRAY(TYPE_CHAR, BTRFS_UUID_SIZE), /* uuid */ + TYPE_ULONGLONG, /* bytes_used */ + TYPE_ULONGLONG, /* total_bytes */ + MK_ARRAY(TYPE_ULONGLONG, 379), /* unused */ + MK_ARRAY(TYPE_CHAR, BTRFS_DEVICE_PATH_NAME_MAX)) /* path */ +#endif + +#ifdef BTRFS_IOC_GET_DEV_STATS +STRUCT(btrfs_ioctl_get_dev_stats, + TYPE_ULONGLONG, /* devid */ + TYPE_ULONGLONG, /* nr_items */ + TYPE_ULONGLONG, /* flags */ + MK_ARRAY(TYPE_ULONGLONG, BTRFS_DEV_STAT_VALUES_MAX), /* values */ + MK_ARRAY(TYPE_ULONGLONG, + 128 - 2 - BTRFS_DEV_STAT_VALUES_MAX)) /* unused */ +#endif + STRUCT(rtc_time, TYPE_INT, /* tm_sec */ TYPE_INT, /* tm_min */