1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_IOCTL_H
3 #define _BCACHEFS_IOCTL_H
5 #include <linux/uuid.h>
7 #include "bcachefs_format.h"
10 * Flags common to multiple ioctls:
12 #define BCH_FORCE_IF_DATA_LOST (1 << 0)
13 #define BCH_FORCE_IF_METADATA_LOST (1 << 1)
14 #define BCH_FORCE_IF_DATA_DEGRADED (1 << 2)
15 #define BCH_FORCE_IF_METADATA_DEGRADED (1 << 3)
17 #define BCH_FORCE_IF_LOST \
18 (BCH_FORCE_IF_DATA_LOST| \
19 BCH_FORCE_IF_METADATA_LOST)
20 #define BCH_FORCE_IF_DEGRADED \
21 (BCH_FORCE_IF_DATA_DEGRADED| \
22 BCH_FORCE_IF_METADATA_DEGRADED)
25 * If cleared, ioctl that refer to a device pass it as a pointer to a pathname
26 * (e.g. /dev/sda1); if set, the dev field is the device's index within the
29 #define BCH_BY_INDEX (1 << 4)
32 * For BCH_IOCTL_READ_SUPER: get superblock of a specific device, not filesystem
35 #define BCH_READ_DEV (1 << 5)
37 /* global control dev: */
39 /* These are currently broken, and probably unnecessary: */
41 #define BCH_IOCTL_ASSEMBLE _IOW(0xbc, 1, struct bch_ioctl_assemble)
42 #define BCH_IOCTL_INCREMENTAL _IOW(0xbc, 2, struct bch_ioctl_incremental)
44 struct bch_ioctl_assemble {
51 struct bch_ioctl_incremental {
58 /* filesystem ioctls: */
60 #define BCH_IOCTL_QUERY_UUID _IOR(0xbc, 1, struct bch_ioctl_query_uuid)
62 /* These only make sense when we also have incremental assembly */
64 #define BCH_IOCTL_START _IOW(0xbc, 2, struct bch_ioctl_start)
65 #define BCH_IOCTL_STOP _IO(0xbc, 3)
68 #define BCH_IOCTL_DISK_ADD _IOW(0xbc, 4, struct bch_ioctl_disk)
69 #define BCH_IOCTL_DISK_REMOVE _IOW(0xbc, 5, struct bch_ioctl_disk)
70 #define BCH_IOCTL_DISK_ONLINE _IOW(0xbc, 6, struct bch_ioctl_disk)
71 #define BCH_IOCTL_DISK_OFFLINE _IOW(0xbc, 7, struct bch_ioctl_disk)
72 #define BCH_IOCTL_DISK_SET_STATE _IOW(0xbc, 8, struct bch_ioctl_disk_set_state)
73 #define BCH_IOCTL_DATA _IOW(0xbc, 10, struct bch_ioctl_data)
74 #define BCH_IOCTL_FS_USAGE _IOWR(0xbc, 11, struct bch_ioctl_fs_usage)
75 #define BCH_IOCTL_DEV_USAGE _IOWR(0xbc, 11, struct bch_ioctl_dev_usage)
76 #define BCH_IOCTL_READ_SUPER _IOW(0xbc, 12, struct bch_ioctl_read_super)
77 #define BCH_IOCTL_DISK_GET_IDX _IOW(0xbc, 13, struct bch_ioctl_disk_get_idx)
78 #define BCH_IOCTL_DISK_RESIZE _IOW(0xbc, 14, struct bch_ioctl_disk_resize)
79 #define BCH_IOCTL_DISK_RESIZE_JOURNAL _IOW(0xbc,15, struct bch_ioctl_disk_resize_journal)
81 #define BCH_IOCTL_SUBVOLUME_CREATE _IOW(0xbc, 16, struct bch_ioctl_subvolume)
82 #define BCH_IOCTL_SUBVOLUME_DESTROY _IOW(0xbc, 17, struct bch_ioctl_subvolume)
84 #define BCH_IOCTL_DEV_USAGE_V2 _IOWR(0xbc, 18, struct bch_ioctl_dev_usage_v2)
86 #define BCH_IOCTL_FSCK_OFFLINE _IOW(0xbc, 19, struct bch_ioctl_fsck_offline)
88 #define BCH_IOCTL_FSCK_ONLINE _IOW(0xbc, 20, struct bch_ioctl_fsck_online)
90 /* ioctl below act on a particular file, not the filesystem as a whole: */
92 #define BCHFS_IOC_REINHERIT_ATTRS _IOR(0xbc, 64, const char __user *)
95 * BCH_IOCTL_QUERY_UUID: get filesystem UUID
97 * Returns user visible UUID, not internal UUID (which may not ever be changed);
98 * the filesystem's sysfs directory may be found under /sys/fs/bcachefs with
101 struct bch_ioctl_query_uuid {
106 struct bch_ioctl_start {
113 * BCH_IOCTL_DISK_ADD: add a new device to an existing filesystem
115 * The specified device must not be open or in use. On success, the new device
116 * will be an online member of the filesystem just like any other member.
118 * The device must first be prepared by userspace by formatting with a bcachefs
119 * superblock, which is only used for passing in superblock options/parameters
120 * for that device (in struct bch_member). The new device's superblock should
121 * not claim to be a member of any existing filesystem - UUIDs on it will be
126 * BCH_IOCTL_DISK_REMOVE: permanently remove a member device from a filesystem
128 * Any data present on @dev will be permanently deleted, and @dev will be
129 * removed from its slot in the filesystem's list of member devices. The device
130 * may be either offline or offline.
132 * Will fail removing @dev would leave us with insufficient read write devices
133 * or degraded/unavailable data, unless the approprate BCH_FORCE_IF_* flags are
138 * BCH_IOCTL_DISK_ONLINE: given a disk that is already a member of a filesystem
139 * but is not open (e.g. because we started in degraded mode), bring it online
141 * all existing data on @dev will be available once the device is online,
142 * exactly as if @dev was present when the filesystem was first mounted
146 * BCH_IOCTL_DISK_OFFLINE: offline a disk, causing the kernel to close that
147 * block device, without removing it from the filesystem (so it can be brought
150 * Data present on @dev will be unavailable while @dev is offline (unless
151 * replicated), but will still be intact and untouched if @dev is brought back
154 * Will fail (similarly to BCH_IOCTL_DISK_SET_STATE) if offlining @dev would
155 * leave us with insufficient read write devices or degraded/unavailable data,
156 * unless the approprate BCH_FORCE_IF_* flags are set.
159 struct bch_ioctl_disk {
166 * BCH_IOCTL_DISK_SET_STATE: modify state of a member device of a filesystem
168 * @new_state - one of the bch_member_state states (rw, ro, failed,
171 * Will refuse to change member state if we would then have insufficient devices
172 * to write to, or if it would result in degraded data (when @new_state is
173 * failed or spare) unless the appropriate BCH_FORCE_IF_* flags are set.
175 struct bch_ioctl_disk_set_state {
182 #define BCH_DATA_OPS() \
186 x(rewrite_old_nodes, 3) \
187 x(drop_extra_replicas, 4)
190 #define x(t, n) BCH_DATA_OP_##t = n,
197 * BCH_IOCTL_DATA: operations that walk and manipulate filesystem data (e.g.
198 * scrub, rereplicate, migrate).
200 * This ioctl kicks off a job in the background, and returns a file descriptor.
201 * Reading from the file descriptor returns a struct bch_ioctl_data_event,
202 * indicating current progress, and closing the file descriptor will stop the
203 * job. The file descriptor is O_CLOEXEC.
205 struct bch_ioctl_data {
211 struct bpos start_pos;
223 } __packed __aligned(8);
225 enum bch_data_event {
226 BCH_DATA_EVENT_PROGRESS = 0,
227 /* XXX: add an event for reporting errors */
228 BCH_DATA_EVENT_NR = 1,
231 struct bch_ioctl_data_progress {
239 } __packed __aligned(8);
241 struct bch_ioctl_data_event {
245 struct bch_ioctl_data_progress p;
248 } __packed __aligned(8);
250 struct bch_replicas_usage {
252 struct bch_replicas_entry_v1 r;
255 static inline struct bch_replicas_usage *
256 replicas_usage_next(struct bch_replicas_usage *u)
258 return (void *) u + replicas_entry_bytes(&u->r) + 8;
262 * BCH_IOCTL_FS_USAGE: query filesystem disk space usage
264 * Returns disk space usage broken out by data type, number of replicas, and
265 * by component device
267 * @replica_entries_bytes - size, in bytes, allocated for replica usage entries
269 * On success, @replica_entries_bytes will be changed to indicate the number of
270 * bytes actually used.
272 * Returns -ERANGE if @replica_entries_bytes was too small
274 struct bch_ioctl_fs_usage {
277 __u64 online_reserved;
278 __u64 persistent_reserved[BCH_REPLICAS_MAX];
280 __u32 replica_entries_bytes;
283 struct bch_replicas_usage replicas[];
287 * BCH_IOCTL_DEV_USAGE: query device disk space usage
289 * Returns disk space usage broken out by data type - both by buckets and
292 struct bch_ioctl_dev_usage {
303 struct bch_ioctl_dev_usage_type {
310 struct bch_ioctl_dev_usage_v2 {
320 struct bch_ioctl_dev_usage_type d[];
324 * BCH_IOCTL_READ_SUPER: read filesystem superblock
326 * Equivalent to reading the superblock directly from the block device, except
327 * avoids racing with the kernel writing the superblock or having to figure out
328 * which block device to read
330 * @sb - buffer to read into
331 * @size - size of userspace allocated buffer
332 * @dev - device to read superblock for, if BCH_READ_DEV flag is
335 * Returns -ERANGE if buffer provided is too small
337 struct bch_ioctl_read_super {
346 * BCH_IOCTL_DISK_GET_IDX: give a path to a block device, query filesystem to
347 * determine if disk is a (online) member - if so, returns device's index
349 * Returns -ENOENT if not found
351 struct bch_ioctl_disk_get_idx {
356 * BCH_IOCTL_DISK_RESIZE: resize filesystem on a device
358 * @dev - member to resize
359 * @nbuckets - new number of buckets
361 struct bch_ioctl_disk_resize {
369 * BCH_IOCTL_DISK_RESIZE_JOURNAL: resize journal on a device
371 * @dev - member to resize
372 * @nbuckets - new number of buckets
374 struct bch_ioctl_disk_resize_journal {
381 struct bch_ioctl_subvolume {
390 #define BCH_SUBVOL_SNAPSHOT_CREATE (1U << 0)
391 #define BCH_SUBVOL_SNAPSHOT_RO (1U << 1)
394 * BCH_IOCTL_FSCK_OFFLINE: run fsck from the 'bcachefs fsck' userspace command,
395 * but with the kernel's implementation of fsck:
397 struct bch_ioctl_fsck_offline {
399 __u64 opts; /* string */
405 * BCH_IOCTL_FSCK_ONLINE: run fsck from the 'bcachefs fsck' userspace command,
406 * but with the kernel's implementation of fsck:
408 struct bch_ioctl_fsck_online {
410 __u64 opts; /* string */
413 #endif /* _BCACHEFS_IOCTL_H */