1 #ifndef _BCACHEFS_IOCTL_H
2 #define _BCACHEFS_IOCTL_H
4 #include <linux/uuid.h>
6 #include "bcachefs_format.h"
9 * Flags common to multiple ioctls:
11 #define BCH_FORCE_IF_DATA_LOST (1 << 0)
12 #define BCH_FORCE_IF_METADATA_LOST (1 << 1)
13 #define BCH_FORCE_IF_DATA_DEGRADED (1 << 2)
14 #define BCH_FORCE_IF_METADATA_DEGRADED (1 << 3)
16 #define BCH_FORCE_IF_DEGRADED \
17 (BCH_FORCE_IF_DATA_DEGRADED| \
18 BCH_FORCE_IF_METADATA_DEGRADED)
21 * If cleared, ioctl that refer to a device pass it as a pointer to a pathname
22 * (e.g. /dev/sda1); if set, the dev field is the device's index within the
25 #define BCH_BY_INDEX (1 << 4)
28 * For BCH_IOCTL_READ_SUPER: get superblock of a specific device, not filesystem
31 #define BCH_READ_DEV (1 << 5)
33 /* global control dev: */
35 /* These are currently broken, and probably unnecessary: */
37 #define BCH_IOCTL_ASSEMBLE _IOW(0xbc, 1, struct bch_ioctl_assemble)
38 #define BCH_IOCTL_INCREMENTAL _IOW(0xbc, 2, struct bch_ioctl_incremental)
40 struct bch_ioctl_assemble {
47 struct bch_ioctl_incremental {
54 /* filesystem ioctls: */
56 #define BCH_IOCTL_QUERY_UUID _IOR(0xbc, 1, struct bch_ioctl_query_uuid)
58 /* These only make sense when we also have incremental assembly */
60 #define BCH_IOCTL_START _IOW(0xbc, 2, struct bch_ioctl_start)
61 #define BCH_IOCTL_STOP _IO(0xbc, 3)
64 #define BCH_IOCTL_DISK_ADD _IOW(0xbc, 4, struct bch_ioctl_disk)
65 #define BCH_IOCTL_DISK_REMOVE _IOW(0xbc, 5, struct bch_ioctl_disk)
66 #define BCH_IOCTL_DISK_ONLINE _IOW(0xbc, 6, struct bch_ioctl_disk)
67 #define BCH_IOCTL_DISK_OFFLINE _IOW(0xbc, 7, struct bch_ioctl_disk)
68 #define BCH_IOCTL_DISK_SET_STATE _IOW(0xbc, 8, struct bch_ioctl_disk_set_state)
69 #define BCH_IOCTL_DATA _IOW(0xbc, 10, struct bch_ioctl_data)
70 #define BCH_IOCTL_USAGE _IOWR(0xbc, 11, struct bch_ioctl_usage)
71 #define BCH_IOCTL_READ_SUPER _IOW(0xbc, 12, struct bch_ioctl_read_super)
72 #define BCH_IOCTL_DISK_GET_IDX _IOW(0xbc, 13, struct bch_ioctl_disk_get_idx)
73 #define BCH_IOCTL_DISK_RESIZE _IOW(0xbc, 13, struct bch_ioctl_disk_resize)
76 * BCH_IOCTL_QUERY_UUID: get filesystem UUID
78 * Returns user visible UUID, not internal UUID (which may not ever be changed);
79 * the filesystem's sysfs directory may be found under /sys/fs/bcachefs with
82 struct bch_ioctl_query_uuid {
87 struct bch_ioctl_start {
94 * BCH_IOCTL_DISK_ADD: add a new device to an existing filesystem
96 * The specified device must not be open or in use. On success, the new device
97 * will be an online member of the filesystem just like any other member.
99 * The device must first be prepared by userspace by formatting with a bcachefs
100 * superblock, which is only used for passing in superblock options/parameters
101 * for that device (in struct bch_member). The new device's superblock should
102 * not claim to be a member of any existing filesystem - UUIDs on it will be
107 * BCH_IOCTL_DISK_REMOVE: permanently remove a member device from a filesystem
109 * Any data present on @dev will be permanently deleted, and @dev will be
110 * removed from its slot in the filesystem's list of member devices. The device
111 * may be either offline or offline.
113 * Will fail removing @dev would leave us with insufficient read write devices
114 * or degraded/unavailable data, unless the approprate BCH_FORCE_IF_* flags are
119 * BCH_IOCTL_DISK_ONLINE: given a disk that is already a member of a filesystem
120 * but is not open (e.g. because we started in degraded mode), bring it online
122 * all existing data on @dev will be available once the device is online,
123 * exactly as if @dev was present when the filesystem was first mounted
127 * BCH_IOCTL_DISK_OFFLINE: offline a disk, causing the kernel to close that
128 * block device, without removing it from the filesystem (so it can be brought
131 * Data present on @dev will be unavailable while @dev is offline (unless
132 * replicated), but will still be intact and untouched if @dev is brought back
135 * Will fail (similarly to BCH_IOCTL_DISK_SET_STATE) if offlining @dev would
136 * leave us with insufficient read write devices or degraded/unavailable data,
137 * unless the approprate BCH_FORCE_IF_* flags are set.
140 struct bch_ioctl_disk {
147 * BCH_IOCTL_DISK_SET_STATE: modify state of a member device of a filesystem
149 * @new_state - one of the bch_member_state states (rw, ro, failed,
152 * Will refuse to change member state if we would then have insufficient devices
153 * to write to, or if it would result in degraded data (when @new_state is
154 * failed or spare) unless the appropriate BCH_FORCE_IF_* flags are set.
156 struct bch_ioctl_disk_set_state {
164 BCH_DATA_OP_SCRUB = 0,
165 BCH_DATA_OP_REREPLICATE = 1,
166 BCH_DATA_OP_MIGRATE = 2,
171 * BCH_IOCTL_DATA: operations that walk and manipulate filesystem data (e.g.
172 * scrub, rereplicate, migrate).
174 * This ioctl kicks off a job in the background, and returns a file descriptor.
175 * Reading from the file descriptor returns a struct bch_ioctl_data_event,
176 * indicating current progress, and closing the file descriptor will stop the
177 * job. The file descriptor is O_CLOEXEC.
179 struct bch_ioctl_data {
195 } __attribute__((packed, aligned(8)));
197 enum bch_data_event {
198 BCH_DATA_EVENT_PROGRESS = 0,
199 /* XXX: add an event for reporting errors */
200 BCH_DATA_EVENT_NR = 1,
203 struct bch_ioctl_data_progress {
211 } __attribute__((packed, aligned(8)));
213 struct bch_ioctl_data_event {
217 struct bch_ioctl_data_progress p;
220 } __attribute__((packed, aligned(8)));
222 struct bch_ioctl_dev_usage {
231 __u64 buckets[BCH_DATA_NR];
232 __u64 sectors[BCH_DATA_NR];
235 struct bch_ioctl_fs_usage {
238 __u64 online_reserved;
239 __u64 persistent_reserved[BCH_REPLICAS_MAX];
240 __u64 sectors[BCH_DATA_NR][BCH_REPLICAS_MAX];
244 * BCH_IOCTL_USAGE: query filesystem disk space usage
246 * Returns disk space usage broken out by data type, number of replicas, and
247 * by component device
249 * @nr_devices - number of devices userspace allocated space for in @devs
251 * On success, @fs and @devs will be filled out appropriately and devs[i].alive
252 * will indicate if a device was present in that slot
254 * Returns -ERANGE if @nr_devices was too small
256 struct bch_ioctl_usage {
260 struct bch_ioctl_fs_usage fs;
261 struct bch_ioctl_dev_usage devs[0];
265 * BCH_IOCTL_READ_SUPER: read filesystem superblock
267 * Equivalent to reading the superblock directly from the block device, except
268 * avoids racing with the kernel writing the superblock or having to figure out
269 * which block device to read
271 * @sb - buffer to read into
272 * @size - size of userspace allocated buffer
273 * @dev - device to read superblock for, if BCH_READ_DEV flag is
276 * Returns -ERANGE if buffer provided is too small
278 struct bch_ioctl_read_super {
287 * BCH_IOCTL_DISK_GET_IDX: give a path to a block device, query filesystem to
288 * determine if disk is a (online) member - if so, returns device's index
290 * Returns -ENOENT if not found
292 struct bch_ioctl_disk_get_idx {
297 * BCH_IOCTL_DISK_RESIZE: resize filesystem on a device
299 * @dev - member to resize
300 * @nbuckets - new number of buckets
302 struct bch_ioctl_disk_resize {
309 #endif /* _BCACHEFS_IOCTL_H */