diff options
Diffstat (limited to 'fs/bcachefs/chardev.c')
| -rw-r--r-- | fs/bcachefs/chardev.c | 843 |
1 files changed, 0 insertions, 843 deletions
diff --git a/fs/bcachefs/chardev.c b/fs/bcachefs/chardev.c deleted file mode 100644 index 5ea89aa2b0c4..000000000000 --- a/fs/bcachefs/chardev.c +++ /dev/null @@ -1,843 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#ifndef NO_BCACHEFS_CHARDEV - -#include "bcachefs.h" -#include "bcachefs_ioctl.h" -#include "buckets.h" -#include "chardev.h" -#include "disk_accounting.h" -#include "fsck.h" -#include "journal.h" -#include "move.h" -#include "recovery_passes.h" -#include "replicas.h" -#include "sb-counters.h" -#include "super-io.h" -#include "thread_with_file.h" - -#include <linux/cdev.h> -#include <linux/device.h> -#include <linux/fs.h> -#include <linux/ioctl.h> -#include <linux/major.h> -#include <linux/sched/task.h> -#include <linux/slab.h> -#include <linux/uaccess.h> - -/* returns with ref on ca->ref */ -static struct bch_dev *bch2_device_lookup(struct bch_fs *c, u64 dev, - unsigned flags) -{ - struct bch_dev *ca; - - if (flags & BCH_BY_INDEX) { - if (dev >= c->sb.nr_devices) - return ERR_PTR(-EINVAL); - - ca = bch2_dev_tryget_noerror(c, dev); - if (!ca) - return ERR_PTR(-EINVAL); - } else { - char *path; - - path = strndup_user((const char __user *) - (unsigned long) dev, PATH_MAX); - if (IS_ERR(path)) - return ERR_CAST(path); - - ca = bch2_dev_lookup(c, path); - kfree(path); - } - - return ca; -} - -#if 0 -static long bch2_ioctl_assemble(struct bch_ioctl_assemble __user *user_arg) -{ - struct bch_ioctl_assemble arg; - struct bch_fs *c; - u64 *user_devs = NULL; - char **devs = NULL; - unsigned i; - int ret = -EFAULT; - - if (copy_from_user(&arg, user_arg, sizeof(arg))) - return -EFAULT; - - if (arg.flags || arg.pad) - return -EINVAL; - - user_devs = kmalloc_array(arg.nr_devs, sizeof(u64), GFP_KERNEL); - if (!user_devs) - return -ENOMEM; - - devs = kcalloc(arg.nr_devs, sizeof(char *), GFP_KERNEL); - - if (copy_from_user(user_devs, user_arg->devs, - sizeof(u64) * arg.nr_devs)) - goto err; - - for (i = 0; i < arg.nr_devs; i++) { - devs[i] = strndup_user((const char __user *)(unsigned long) - user_devs[i], - PATH_MAX); - ret= PTR_ERR_OR_ZERO(devs[i]); - if (ret) - goto err; - } - - c = bch2_fs_open(devs, arg.nr_devs, bch2_opts_empty()); - ret = PTR_ERR_OR_ZERO(c); - if (!ret) - closure_put(&c->cl); -err: - if (devs) - for (i = 0; i < arg.nr_devs; i++) - kfree(devs[i]); - kfree(devs); - return ret; -} - -static long bch2_ioctl_incremental(struct bch_ioctl_incremental __user *user_arg) -{ - struct bch_ioctl_incremental arg; - const char *err; - char *path; - - if (copy_from_user(&arg, user_arg, sizeof(arg))) - return -EFAULT; - - if (arg.flags || arg.pad) - return -EINVAL; - - path = strndup_user((const char __user *)(unsigned long) arg.dev, PATH_MAX); - ret = PTR_ERR_OR_ZERO(path); - if (ret) - return ret; - - err = bch2_fs_open_incremental(path); - kfree(path); - - if (err) { - pr_err("Could not register bcachefs devices: %s", err); - return -EINVAL; - } - - return 0; -} -#endif - -static long bch2_global_ioctl(unsigned cmd, void __user *arg) -{ - long ret; - - switch (cmd) { -#if 0 - case BCH_IOCTL_ASSEMBLE: - return bch2_ioctl_assemble(arg); - case BCH_IOCTL_INCREMENTAL: - return bch2_ioctl_incremental(arg); -#endif - case BCH_IOCTL_FSCK_OFFLINE: { - ret = bch2_ioctl_fsck_offline(arg); - break; - } - default: - ret = -ENOTTY; - break; - } - - if (ret < 0) - ret = bch2_err_class(ret); - return ret; -} - -static long bch2_ioctl_query_uuid(struct bch_fs *c, - struct bch_ioctl_query_uuid __user *user_arg) -{ - return copy_to_user_errcode(&user_arg->uuid, &c->sb.user_uuid, - sizeof(c->sb.user_uuid)); -} - -#if 0 -static long bch2_ioctl_start(struct bch_fs *c, struct bch_ioctl_start arg) -{ - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if (arg.flags || arg.pad) - return -EINVAL; - - return bch2_fs_start(c); -} - -static long bch2_ioctl_stop(struct bch_fs *c) -{ - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - bch2_fs_stop(c); - return 0; -} -#endif - -static long bch2_ioctl_disk_add(struct bch_fs *c, struct bch_ioctl_disk arg) -{ - char *path; - int ret; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if (arg.flags || arg.pad) - return -EINVAL; - - path = strndup_user((const char __user *)(unsigned long) arg.dev, PATH_MAX); - ret = PTR_ERR_OR_ZERO(path); - if (ret) - return ret; - - ret = bch2_dev_add(c, path); - if (!IS_ERR(path)) - kfree(path); - - return ret; -} - -static long bch2_ioctl_disk_remove(struct bch_fs *c, struct bch_ioctl_disk arg) -{ - struct bch_dev *ca; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if ((arg.flags & ~(BCH_FORCE_IF_DATA_LOST| - BCH_FORCE_IF_METADATA_LOST| - BCH_FORCE_IF_DEGRADED| - BCH_BY_INDEX)) || - arg.pad) - return -EINVAL; - - ca = bch2_device_lookup(c, arg.dev, arg.flags); - if (IS_ERR(ca)) - return PTR_ERR(ca); - - return bch2_dev_remove(c, ca, arg.flags); -} - -static long bch2_ioctl_disk_online(struct bch_fs *c, struct bch_ioctl_disk arg) -{ - char *path; - int ret; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if (arg.flags || arg.pad) - return -EINVAL; - - path = strndup_user((const char __user *)(unsigned long) arg.dev, PATH_MAX); - ret = PTR_ERR_OR_ZERO(path); - if (ret) - return ret; - - ret = bch2_dev_online(c, path); - kfree(path); - return ret; -} - -static long bch2_ioctl_disk_offline(struct bch_fs *c, struct bch_ioctl_disk arg) -{ - struct bch_dev *ca; - int ret; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if ((arg.flags & ~(BCH_FORCE_IF_DATA_LOST| - BCH_FORCE_IF_METADATA_LOST| - BCH_FORCE_IF_DEGRADED| - BCH_BY_INDEX)) || - arg.pad) - return -EINVAL; - - ca = bch2_device_lookup(c, arg.dev, arg.flags); - if (IS_ERR(ca)) - return PTR_ERR(ca); - - ret = bch2_dev_offline(c, ca, arg.flags); - bch2_dev_put(ca); - return ret; -} - -static long bch2_ioctl_disk_set_state(struct bch_fs *c, - struct bch_ioctl_disk_set_state arg) -{ - struct bch_dev *ca; - int ret; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if ((arg.flags & ~(BCH_FORCE_IF_DATA_LOST| - BCH_FORCE_IF_METADATA_LOST| - BCH_FORCE_IF_DEGRADED| - BCH_BY_INDEX)) || - arg.pad[0] || arg.pad[1] || arg.pad[2] || - arg.new_state >= BCH_MEMBER_STATE_NR) - return -EINVAL; - - ca = bch2_device_lookup(c, arg.dev, arg.flags); - if (IS_ERR(ca)) - return PTR_ERR(ca); - - ret = bch2_dev_set_state(c, ca, arg.new_state, arg.flags); - if (ret) - bch_err(c, "Error setting device state: %s", bch2_err_str(ret)); - - bch2_dev_put(ca); - return ret; -} - -struct bch_data_ctx { - struct thread_with_file thr; - - struct bch_fs *c; - struct bch_ioctl_data arg; - struct bch_move_stats stats; -}; - -static int bch2_data_thread(void *arg) -{ - struct bch_data_ctx *ctx = container_of(arg, struct bch_data_ctx, thr); - - ctx->thr.ret = bch2_data_job(ctx->c, &ctx->stats, ctx->arg); - if (ctx->thr.ret == -BCH_ERR_device_offline) - ctx->stats.ret = BCH_IOCTL_DATA_EVENT_RET_device_offline; - else { - ctx->stats.ret = BCH_IOCTL_DATA_EVENT_RET_done; - ctx->stats.data_type = (int) DATA_PROGRESS_DATA_TYPE_done; - } - enumerated_ref_put(&ctx->c->writes, BCH_WRITE_REF_ioctl_data); - return 0; -} - -static int bch2_data_job_release(struct inode *inode, struct file *file) -{ - struct bch_data_ctx *ctx = container_of(file->private_data, struct bch_data_ctx, thr); - - bch2_thread_with_file_exit(&ctx->thr); - kfree(ctx); - return 0; -} - -static ssize_t bch2_data_job_read(struct file *file, char __user *buf, - size_t len, loff_t *ppos) -{ - struct bch_data_ctx *ctx = container_of(file->private_data, struct bch_data_ctx, thr); - struct bch_fs *c = ctx->c; - struct bch_ioctl_data_event e = { - .type = BCH_DATA_EVENT_PROGRESS, - .ret = ctx->stats.ret, - .p.data_type = ctx->stats.data_type, - .p.btree_id = ctx->stats.pos.btree, - .p.pos = ctx->stats.pos.pos, - .p.sectors_done = atomic64_read(&ctx->stats.sectors_seen), - .p.sectors_error_corrected = atomic64_read(&ctx->stats.sectors_error_corrected), - .p.sectors_error_uncorrected = atomic64_read(&ctx->stats.sectors_error_uncorrected), - }; - - if (ctx->arg.op == BCH_DATA_OP_scrub) { - struct bch_dev *ca = bch2_dev_tryget(c, ctx->arg.scrub.dev); - if (ca) { - struct bch_dev_usage_full u; - bch2_dev_usage_full_read_fast(ca, &u); - for (unsigned i = BCH_DATA_btree; i < ARRAY_SIZE(u.d); i++) - if (ctx->arg.scrub.data_types & BIT(i)) - e.p.sectors_total += u.d[i].sectors; - bch2_dev_put(ca); - } - } else { - e.p.sectors_total = bch2_fs_usage_read_short(c).used; - } - - if (len < sizeof(e)) - return -EINVAL; - - return copy_to_user_errcode(buf, &e, sizeof(e)) ?: sizeof(e); -} - -static const struct file_operations bcachefs_data_ops = { - .release = bch2_data_job_release, - .read = bch2_data_job_read, -}; - -static long bch2_ioctl_data(struct bch_fs *c, - struct bch_ioctl_data arg) -{ - struct bch_data_ctx *ctx; - int ret; - - if (!enumerated_ref_tryget(&c->writes, BCH_WRITE_REF_ioctl_data)) - return -EROFS; - - if (!capable(CAP_SYS_ADMIN)) { - ret = -EPERM; - goto put_ref; - } - - if (arg.op >= BCH_DATA_OP_NR || arg.flags) { - ret = -EINVAL; - goto put_ref; - } - - ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); - if (!ctx) { - ret = -ENOMEM; - goto put_ref; - } - - ctx->c = c; - ctx->arg = arg; - - ret = bch2_run_thread_with_file(&ctx->thr, - &bcachefs_data_ops, - bch2_data_thread); - if (ret < 0) - goto cleanup; - return ret; -cleanup: - kfree(ctx); -put_ref: - enumerated_ref_put(&c->writes, BCH_WRITE_REF_ioctl_data); - return ret; -} - -static noinline_for_stack long bch2_ioctl_fs_usage(struct bch_fs *c, - struct bch_ioctl_fs_usage __user *user_arg) -{ - struct bch_ioctl_fs_usage arg = {}; - darray_char replicas = {}; - u32 replica_entries_bytes; - int ret = 0; - - if (!test_bit(BCH_FS_started, &c->flags)) - return -EINVAL; - - if (get_user(replica_entries_bytes, &user_arg->replica_entries_bytes)) - return -EFAULT; - - ret = bch2_fs_replicas_usage_read(c, &replicas) ?: - (replica_entries_bytes < replicas.nr ? -ERANGE : 0) ?: - copy_to_user_errcode(&user_arg->replicas, replicas.data, replicas.nr); - if (ret) - goto err; - - struct bch_fs_usage_short u = bch2_fs_usage_read_short(c); - arg.capacity = c->capacity; - arg.used = u.used; - arg.online_reserved = percpu_u64_get(c->online_reserved); - arg.replica_entries_bytes = replicas.nr; - - for (unsigned i = 0; i < BCH_REPLICAS_MAX; i++) { - struct disk_accounting_pos k; - disk_accounting_key_init(k, persistent_reserved, .nr_replicas = i); - - bch2_accounting_mem_read(c, - disk_accounting_pos_to_bpos(&k), - &arg.persistent_reserved[i], 1); - } - - ret = copy_to_user_errcode(user_arg, &arg, sizeof(arg)); -err: - darray_exit(&replicas); - return ret; -} - -static long bch2_ioctl_query_accounting(struct bch_fs *c, - struct bch_ioctl_query_accounting __user *user_arg) -{ - struct bch_ioctl_query_accounting arg; - darray_char accounting = {}; - int ret = 0; - - if (!test_bit(BCH_FS_started, &c->flags)) - return -EINVAL; - - ret = copy_from_user_errcode(&arg, user_arg, sizeof(arg)) ?: - bch2_fs_accounting_read(c, &accounting, arg.accounting_types_mask) ?: - (arg.accounting_u64s * sizeof(u64) < accounting.nr ? -ERANGE : 0) ?: - copy_to_user_errcode(&user_arg->accounting, accounting.data, accounting.nr); - if (ret) - goto err; - - arg.capacity = c->capacity; - arg.used = bch2_fs_usage_read_short(c).used; - arg.online_reserved = percpu_u64_get(c->online_reserved); - arg.accounting_u64s = accounting.nr / sizeof(u64); - - ret = copy_to_user_errcode(user_arg, &arg, sizeof(arg)); -err: - darray_exit(&accounting); - return ret; -} - -/* obsolete, didn't allow for new data types: */ -static noinline_for_stack long bch2_ioctl_dev_usage(struct bch_fs *c, - struct bch_ioctl_dev_usage __user *user_arg) -{ - struct bch_ioctl_dev_usage arg; - struct bch_dev_usage_full src; - struct bch_dev *ca; - unsigned i; - - if (!test_bit(BCH_FS_started, &c->flags)) - return -EINVAL; - - if (copy_from_user(&arg, user_arg, sizeof(arg))) - return -EFAULT; - - if ((arg.flags & ~BCH_BY_INDEX) || - arg.pad[0] || - arg.pad[1] || - arg.pad[2]) - return -EINVAL; - - ca = bch2_device_lookup(c, arg.dev, arg.flags); - if (IS_ERR(ca)) - return PTR_ERR(ca); - - src = bch2_dev_usage_full_read(ca); - - arg.state = ca->mi.state; - arg.bucket_size = ca->mi.bucket_size; - arg.nr_buckets = ca->mi.nbuckets - ca->mi.first_bucket; - - for (i = 0; i < ARRAY_SIZE(arg.d); i++) { - arg.d[i].buckets = src.d[i].buckets; - arg.d[i].sectors = src.d[i].sectors; - arg.d[i].fragmented = src.d[i].fragmented; - } - - bch2_dev_put(ca); - - return copy_to_user_errcode(user_arg, &arg, sizeof(arg)); -} - -static long bch2_ioctl_dev_usage_v2(struct bch_fs *c, - struct bch_ioctl_dev_usage_v2 __user *user_arg) -{ - struct bch_ioctl_dev_usage_v2 arg; - struct bch_dev_usage_full src; - struct bch_dev *ca; - int ret = 0; - - if (!test_bit(BCH_FS_started, &c->flags)) - return -EINVAL; - - if (copy_from_user(&arg, user_arg, sizeof(arg))) - return -EFAULT; - - if ((arg.flags & ~BCH_BY_INDEX) || - arg.pad[0] || - arg.pad[1] || - arg.pad[2]) - return -EINVAL; - - ca = bch2_device_lookup(c, arg.dev, arg.flags); - if (IS_ERR(ca)) - return PTR_ERR(ca); - - src = bch2_dev_usage_full_read(ca); - - arg.state = ca->mi.state; - arg.bucket_size = ca->mi.bucket_size; - arg.nr_data_types = min(arg.nr_data_types, BCH_DATA_NR); - arg.nr_buckets = ca->mi.nbuckets - ca->mi.first_bucket; - - ret = copy_to_user_errcode(user_arg, &arg, sizeof(arg)); - if (ret) - goto err; - - for (unsigned i = 0; i < arg.nr_data_types; i++) { - struct bch_ioctl_dev_usage_type t = { - .buckets = src.d[i].buckets, - .sectors = src.d[i].sectors, - .fragmented = src.d[i].fragmented, - }; - - ret = copy_to_user_errcode(&user_arg->d[i], &t, sizeof(t)); - if (ret) - goto err; - } -err: - bch2_dev_put(ca); - return ret; -} - -static long bch2_ioctl_read_super(struct bch_fs *c, - struct bch_ioctl_read_super arg) -{ - struct bch_dev *ca = NULL; - struct bch_sb *sb; - int ret = 0; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if ((arg.flags & ~(BCH_BY_INDEX|BCH_READ_DEV)) || - arg.pad) - return -EINVAL; - - mutex_lock(&c->sb_lock); - - if (arg.flags & BCH_READ_DEV) { - ca = bch2_device_lookup(c, arg.dev, arg.flags); - ret = PTR_ERR_OR_ZERO(ca); - if (ret) - goto err_unlock; - - sb = ca->disk_sb.sb; - } else { - sb = c->disk_sb.sb; - } - - if (vstruct_bytes(sb) > arg.size) { - ret = -ERANGE; - goto err; - } - - ret = copy_to_user_errcode((void __user *)(unsigned long)arg.sb, sb, - vstruct_bytes(sb)); -err: - bch2_dev_put(ca); -err_unlock: - mutex_unlock(&c->sb_lock); - return ret; -} - -static long bch2_ioctl_disk_get_idx(struct bch_fs *c, - struct bch_ioctl_disk_get_idx arg) -{ - dev_t dev = huge_decode_dev(arg.dev); - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if (!dev) - return -EINVAL; - - guard(rcu)(); - for_each_online_member_rcu(c, ca) - if (ca->dev == dev) - return ca->dev_idx; - - return bch_err_throw(c, ENOENT_dev_idx_not_found); -} - -static long bch2_ioctl_disk_resize(struct bch_fs *c, - struct bch_ioctl_disk_resize arg) -{ - struct bch_dev *ca; - int ret; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if ((arg.flags & ~BCH_BY_INDEX) || - arg.pad) - return -EINVAL; - - ca = bch2_device_lookup(c, arg.dev, arg.flags); - if (IS_ERR(ca)) - return PTR_ERR(ca); - - ret = bch2_dev_resize(c, ca, arg.nbuckets); - - bch2_dev_put(ca); - return ret; -} - -static long bch2_ioctl_disk_resize_journal(struct bch_fs *c, - struct bch_ioctl_disk_resize_journal arg) -{ - struct bch_dev *ca; - int ret; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if ((arg.flags & ~BCH_BY_INDEX) || - arg.pad) - return -EINVAL; - - if (arg.nbuckets > U32_MAX) - return -EINVAL; - - ca = bch2_device_lookup(c, arg.dev, arg.flags); - if (IS_ERR(ca)) - return PTR_ERR(ca); - - ret = bch2_set_nr_journal_buckets(c, ca, arg.nbuckets); - - bch2_dev_put(ca); - return ret; -} - -#define BCH_IOCTL(_name, _argtype) \ -do { \ - _argtype i; \ - \ - if (copy_from_user(&i, arg, sizeof(i))) \ - return -EFAULT; \ - ret = bch2_ioctl_##_name(c, i); \ - goto out; \ -} while (0) - -long bch2_fs_ioctl(struct bch_fs *c, unsigned cmd, void __user *arg) -{ - long ret; - - switch (cmd) { - case BCH_IOCTL_QUERY_UUID: - return bch2_ioctl_query_uuid(c, arg); - case BCH_IOCTL_FS_USAGE: - return bch2_ioctl_fs_usage(c, arg); - case BCH_IOCTL_DEV_USAGE: - return bch2_ioctl_dev_usage(c, arg); - case BCH_IOCTL_DEV_USAGE_V2: - return bch2_ioctl_dev_usage_v2(c, arg); -#if 0 - case BCH_IOCTL_START: - BCH_IOCTL(start, struct bch_ioctl_start); - case BCH_IOCTL_STOP: - return bch2_ioctl_stop(c); -#endif - case BCH_IOCTL_READ_SUPER: - BCH_IOCTL(read_super, struct bch_ioctl_read_super); - case BCH_IOCTL_DISK_GET_IDX: - BCH_IOCTL(disk_get_idx, struct bch_ioctl_disk_get_idx); - } - - if (!test_bit(BCH_FS_started, &c->flags)) - return -EINVAL; - - switch (cmd) { - case BCH_IOCTL_DISK_ADD: - BCH_IOCTL(disk_add, struct bch_ioctl_disk); - case BCH_IOCTL_DISK_REMOVE: - BCH_IOCTL(disk_remove, struct bch_ioctl_disk); - case BCH_IOCTL_DISK_ONLINE: - BCH_IOCTL(disk_online, struct bch_ioctl_disk); - case BCH_IOCTL_DISK_OFFLINE: - BCH_IOCTL(disk_offline, struct bch_ioctl_disk); - case BCH_IOCTL_DISK_SET_STATE: - BCH_IOCTL(disk_set_state, struct bch_ioctl_disk_set_state); - case BCH_IOCTL_DATA: - BCH_IOCTL(data, struct bch_ioctl_data); - case BCH_IOCTL_DISK_RESIZE: - BCH_IOCTL(disk_resize, struct bch_ioctl_disk_resize); - case BCH_IOCTL_DISK_RESIZE_JOURNAL: - BCH_IOCTL(disk_resize_journal, struct bch_ioctl_disk_resize_journal); - case BCH_IOCTL_FSCK_ONLINE: - BCH_IOCTL(fsck_online, struct bch_ioctl_fsck_online); - case BCH_IOCTL_QUERY_ACCOUNTING: - return bch2_ioctl_query_accounting(c, arg); - case BCH_IOCTL_QUERY_COUNTERS: - return bch2_ioctl_query_counters(c, arg); - default: - return -ENOTTY; - } -out: - if (ret < 0) - ret = bch2_err_class(ret); - return ret; -} - -static DEFINE_IDR(bch_chardev_minor); - -static long bch2_chardev_ioctl(struct file *filp, unsigned cmd, unsigned long v) -{ - unsigned minor = iminor(file_inode(filp)); - struct bch_fs *c = minor < U8_MAX ? idr_find(&bch_chardev_minor, minor) : NULL; - void __user *arg = (void __user *) v; - - return c - ? bch2_fs_ioctl(c, cmd, arg) - : bch2_global_ioctl(cmd, arg); -} - -static const struct file_operations bch_chardev_fops = { - .owner = THIS_MODULE, - .unlocked_ioctl = bch2_chardev_ioctl, - .open = nonseekable_open, -}; - -static int bch_chardev_major; -static const struct class bch_chardev_class = { - .name = "bcachefs", -}; -static struct device *bch_chardev; - -void bch2_fs_chardev_exit(struct bch_fs *c) -{ - if (!IS_ERR_OR_NULL(c->chardev)) - device_unregister(c->chardev); - if (c->minor >= 0) - idr_remove(&bch_chardev_minor, c->minor); -} - -int bch2_fs_chardev_init(struct bch_fs *c) -{ - c->minor = idr_alloc(&bch_chardev_minor, c, 0, 0, GFP_KERNEL); - if (c->minor < 0) - return c->minor; - - c->chardev = device_create(&bch_chardev_class, NULL, - MKDEV(bch_chardev_major, c->minor), c, - "bcachefs%u-ctl", c->minor); - if (IS_ERR(c->chardev)) - return PTR_ERR(c->chardev); - - return 0; -} - -void bch2_chardev_exit(void) -{ - device_destroy(&bch_chardev_class, MKDEV(bch_chardev_major, U8_MAX)); - class_unregister(&bch_chardev_class); - if (bch_chardev_major > 0) - unregister_chrdev(bch_chardev_major, "bcachefs"); -} - -int __init bch2_chardev_init(void) -{ - int ret; - - bch_chardev_major = register_chrdev(0, "bcachefs-ctl", &bch_chardev_fops); - if (bch_chardev_major < 0) - return bch_chardev_major; - - ret = class_register(&bch_chardev_class); - if (ret) - goto major_out; - - bch_chardev = device_create(&bch_chardev_class, NULL, - MKDEV(bch_chardev_major, U8_MAX), - NULL, "bcachefs-ctl"); - if (IS_ERR(bch_chardev)) { - ret = PTR_ERR(bch_chardev); - goto class_out; - } - - return 0; - -class_out: - class_unregister(&bch_chardev_class); -major_out: - unregister_chrdev(bch_chardev_major, "bcachefs-ctl"); - return ret; -} - -#endif /* NO_BCACHEFS_CHARDEV */ |