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_DEGRADED \
18 (BCH_FORCE_IF_DATA_DEGRADED| \
19 BCH_FORCE_IF_METADATA_DEGRADED)
22 * If cleared, ioctl that refer to a device pass it as a pointer to a pathname
23 * (e.g. /dev/sda1); if set, the dev field is the device's index within the
26 #define BCH_BY_INDEX (1 << 4)
29 * For BCH_IOCTL_READ_SUPER: get superblock of a specific device, not filesystem
32 #define BCH_READ_DEV (1 << 5)
34 /* global control dev: */
36 /* These are currently broken, and probably unnecessary: */
38 #define BCH_IOCTL_ASSEMBLE _IOW(0xbc, 1, struct bch_ioctl_assemble)
39 #define BCH_IOCTL_INCREMENTAL _IOW(0xbc, 2, struct bch_ioctl_incremental)
41 struct bch_ioctl_assemble {
48 struct bch_ioctl_incremental {
55 /* filesystem ioctls: */
57 #define BCH_IOCTL_QUERY_UUID _IOR(0xbc, 1, struct bch_ioctl_query_uuid)
59 /* These only make sense when we also have incremental assembly */
61 #define BCH_IOCTL_START _IOW(0xbc, 2, struct bch_ioctl_start)
62 #define BCH_IOCTL_STOP _IO(0xbc, 3)
65 #define BCH_IOCTL_DISK_ADD _IOW(0xbc, 4, struct bch_ioctl_disk)
66 #define BCH_IOCTL_DISK_REMOVE _IOW(0xbc, 5, struct bch_ioctl_disk)
67 #define BCH_IOCTL_DISK_ONLINE _IOW(0xbc, 6, struct bch_ioctl_disk)
68 #define BCH_IOCTL_DISK_OFFLINE _IOW(0xbc, 7, struct bch_ioctl_disk)
69 #define BCH_IOCTL_DISK_SET_STATE _IOW(0xbc, 8, struct bch_ioctl_disk_set_state)
70 #define BCH_IOCTL_DATA _IOW(0xbc, 10, struct bch_ioctl_data)
71 #define BCH_IOCTL_FS_USAGE _IOWR(0xbc, 11, struct bch_ioctl_fs_usage)
72 #define BCH_IOCTL_DEV_USAGE _IOWR(0xbc, 11, struct bch_ioctl_dev_usage)
73 #define BCH_IOCTL_READ_SUPER _IOW(0xbc, 12, struct bch_ioctl_read_super)
74 #define BCH_IOCTL_DISK_GET_IDX _IOW(0xbc, 13, struct bch_ioctl_disk_get_idx)
75 #define BCH_IOCTL_DISK_RESIZE _IOW(0xbc, 14, struct bch_ioctl_disk_resize)
77 /* ioctl below act on a particular file, not the filesystem as a whole: */
79 #define BCHFS_IOC_REINHERIT_ATTRS _IOR(0xbc, 64, const char __user *)
82 * BCH_IOCTL_QUERY_UUID: get filesystem UUID
84 * Returns user visible UUID, not internal UUID (which may not ever be changed);
85 * the filesystem's sysfs directory may be found under /sys/fs/bcachefs with
88 struct bch_ioctl_query_uuid {
93 struct bch_ioctl_start {
100 * BCH_IOCTL_DISK_ADD: add a new device to an existing filesystem
102 * The specified device must not be open or in use. On success, the new device
103 * will be an online member of the filesystem just like any other member.
105 * The device must first be prepared by userspace by formatting with a bcachefs
106 * superblock, which is only used for passing in superblock options/parameters
107 * for that device (in struct bch_member). The new device's superblock should
108 * not claim to be a member of any existing filesystem - UUIDs on it will be
113 * BCH_IOCTL_DISK_REMOVE: permanently remove a member device from a filesystem
115 * Any data present on @dev will be permanently deleted, and @dev will be
116 * removed from its slot in the filesystem's list of member devices. The device
117 * may be either offline or offline.
119 * Will fail removing @dev would leave us with insufficient read write devices
120 * or degraded/unavailable data, unless the approprate BCH_FORCE_IF_* flags are
125 * BCH_IOCTL_DISK_ONLINE: given a disk that is already a member of a filesystem
126 * but is not open (e.g. because we started in degraded mode), bring it online
128 * all existing data on @dev will be available once the device is online,
129 * exactly as if @dev was present when the filesystem was first mounted
133 * BCH_IOCTL_DISK_OFFLINE: offline a disk, causing the kernel to close that
134 * block device, without removing it from the filesystem (so it can be brought
137 * Data present on @dev will be unavailable while @dev is offline (unless
138 * replicated), but will still be intact and untouched if @dev is brought back
141 * Will fail (similarly to BCH_IOCTL_DISK_SET_STATE) if offlining @dev would
142 * leave us with insufficient read write devices or degraded/unavailable data,
143 * unless the approprate BCH_FORCE_IF_* flags are set.
146 struct bch_ioctl_disk {
153 * BCH_IOCTL_DISK_SET_STATE: modify state of a member device of a filesystem
155 * @new_state - one of the bch_member_state states (rw, ro, failed,
158 * Will refuse to change member state if we would then have insufficient devices
159 * to write to, or if it would result in degraded data (when @new_state is
160 * failed or spare) unless the appropriate BCH_FORCE_IF_* flags are set.
162 struct bch_ioctl_disk_set_state {
170 BCH_DATA_OP_SCRUB = 0,
171 BCH_DATA_OP_REREPLICATE = 1,
172 BCH_DATA_OP_MIGRATE = 2,
177 * BCH_IOCTL_DATA: operations that walk and manipulate filesystem data (e.g.
178 * scrub, rereplicate, migrate).
180 * This ioctl kicks off a job in the background, and returns a file descriptor.
181 * Reading from the file descriptor returns a struct bch_ioctl_data_event,
182 * indicating current progress, and closing the file descriptor will stop the
183 * job. The file descriptor is O_CLOEXEC.
185 struct bch_ioctl_data {
201 } __attribute__((packed, aligned(8)));
203 enum bch_data_event {
204 BCH_DATA_EVENT_PROGRESS = 0,
205 /* XXX: add an event for reporting errors */
206 BCH_DATA_EVENT_NR = 1,
209 struct bch_ioctl_data_progress {
217 } __attribute__((packed, aligned(8)));
219 struct bch_ioctl_data_event {
223 struct bch_ioctl_data_progress p;
226 } __attribute__((packed, aligned(8)));
228 struct bch_replicas_usage {
230 struct bch_replicas_entry r;
231 } __attribute__((packed));
233 static inline struct bch_replicas_usage *
234 replicas_usage_next(struct bch_replicas_usage *u)
236 return (void *) u + replicas_entry_bytes(&u->r) + 8;
240 * BCH_IOCTL_FS_USAGE: query filesystem disk space usage
242 * Returns disk space usage broken out by data type, number of replicas, and
243 * by component device
245 * @replica_entries_bytes - size, in bytes, allocated for replica usage entries
247 * On success, @replica_entries_bytes will be changed to indicate the number of
248 * bytes actually used.
250 * Returns -ERANGE if @replica_entries_bytes was too small
252 struct bch_ioctl_fs_usage {
255 __u64 online_reserved;
256 __u64 persistent_reserved[BCH_REPLICAS_MAX];
258 __u32 replica_entries_bytes;
261 struct bch_replicas_usage replicas[0];
265 * BCH_IOCTL_DEV_USAGE: query device disk space usage
267 * Returns disk space usage broken out by data type - both by buckets and
270 struct bch_ioctl_dev_usage {
278 __u64 available_buckets;
280 __u64 buckets[BCH_DATA_NR];
281 __u64 sectors[BCH_DATA_NR];
288 * BCH_IOCTL_READ_SUPER: read filesystem superblock
290 * Equivalent to reading the superblock directly from the block device, except
291 * avoids racing with the kernel writing the superblock or having to figure out
292 * which block device to read
294 * @sb - buffer to read into
295 * @size - size of userspace allocated buffer
296 * @dev - device to read superblock for, if BCH_READ_DEV flag is
299 * Returns -ERANGE if buffer provided is too small
301 struct bch_ioctl_read_super {
310 * BCH_IOCTL_DISK_GET_IDX: give a path to a block device, query filesystem to
311 * determine if disk is a (online) member - if so, returns device's index
313 * Returns -ENOENT if not found
315 struct bch_ioctl_disk_get_idx {
320 * BCH_IOCTL_DISK_RESIZE: resize filesystem on a device
322 * @dev - member to resize
323 * @nbuckets - new number of buckets
325 struct bch_ioctl_disk_resize {
332 #endif /* _BCACHEFS_IOCTL_H */