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Diffstat (limited to 'c_src/libbcachefs/chardev.c')
-rw-r--r--c_src/libbcachefs/chardev.c999
1 files changed, 999 insertions, 0 deletions
diff --git a/c_src/libbcachefs/chardev.c b/c_src/libbcachefs/chardev.c
new file mode 100644
index 00000000..226b39c1
--- /dev/null
+++ b/c_src/libbcachefs/chardev.c
@@ -0,0 +1,999 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef NO_BCACHEFS_CHARDEV
+
+#include "bcachefs.h"
+#include "bcachefs_ioctl.h"
+#include "buckets.h"
+#include "chardev.h"
+#include "journal.h"
+#include "move.h"
+#include "recovery.h"
+#include "replicas.h"
+#include "super.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>
+
+__must_check
+static int copy_to_user_errcode(void __user *to, const void *from, unsigned long n)
+{
+ return copy_to_user(to, from, n) ? -EFAULT : 0;
+}
+
+/* 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);
+
+ rcu_read_lock();
+ ca = rcu_dereference(c->devs[dev]);
+ if (ca)
+ percpu_ref_get(&ca->ref);
+ rcu_read_unlock();
+
+ 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
+
+struct fsck_thread {
+ struct thread_with_stdio thr;
+ struct bch_fs *c;
+ char **devs;
+ size_t nr_devs;
+ struct bch_opts opts;
+};
+
+static void bch2_fsck_thread_exit(struct thread_with_stdio *_thr)
+{
+ struct fsck_thread *thr = container_of(_thr, struct fsck_thread, thr);
+ if (thr->devs)
+ for (size_t i = 0; i < thr->nr_devs; i++)
+ kfree(thr->devs[i]);
+ kfree(thr->devs);
+ kfree(thr);
+}
+
+static int bch2_fsck_offline_thread_fn(void *arg)
+{
+ struct fsck_thread *thr = container_of(arg, struct fsck_thread, thr);
+ struct bch_fs *c = bch2_fs_open(thr->devs, thr->nr_devs, thr->opts);
+
+ thr->thr.thr.ret = PTR_ERR_OR_ZERO(c);
+ if (!thr->thr.thr.ret)
+ bch2_fs_stop(c);
+
+ thread_with_stdio_done(&thr->thr);
+ return 0;
+}
+
+static long bch2_ioctl_fsck_offline(struct bch_ioctl_fsck_offline __user *user_arg)
+{
+ struct bch_ioctl_fsck_offline arg;
+ struct fsck_thread *thr = NULL;
+ u64 *devs = NULL;
+ long ret = 0;
+
+ if (copy_from_user(&arg, user_arg, sizeof(arg)))
+ return -EFAULT;
+
+ if (arg.flags)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!(devs = kcalloc(arg.nr_devs, sizeof(*devs), GFP_KERNEL)) ||
+ !(thr = kzalloc(sizeof(*thr), GFP_KERNEL)) ||
+ !(thr->devs = kcalloc(arg.nr_devs, sizeof(*thr->devs), GFP_KERNEL))) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ thr->opts = bch2_opts_empty();
+ thr->nr_devs = arg.nr_devs;
+
+ if (copy_from_user(devs, &user_arg->devs[0],
+ array_size(sizeof(user_arg->devs[0]), arg.nr_devs))) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ for (size_t i = 0; i < arg.nr_devs; i++) {
+ thr->devs[i] = strndup_user((char __user *)(unsigned long) devs[i], PATH_MAX);
+ ret = PTR_ERR_OR_ZERO(thr->devs[i]);
+ if (ret)
+ goto err;
+ }
+
+ if (arg.opts) {
+ char *optstr = strndup_user((char __user *)(unsigned long) arg.opts, 1 << 16);
+
+ ret = PTR_ERR_OR_ZERO(optstr) ?:
+ bch2_parse_mount_opts(NULL, &thr->opts, optstr);
+ kfree(optstr);
+
+ if (ret)
+ goto err;
+ }
+
+ opt_set(thr->opts, stdio, (u64)(unsigned long)&thr->thr.stdio);
+
+ ret = bch2_run_thread_with_stdio(&thr->thr,
+ bch2_fsck_thread_exit,
+ bch2_fsck_offline_thread_fn);
+err:
+ if (ret < 0) {
+ if (thr)
+ bch2_fsck_thread_exit(&thr->thr);
+ pr_err("ret %s", bch2_err_str(ret));
+ }
+ kfree(devs);
+ return ret;
+}
+
+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);
+ 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);
+ percpu_ref_put(&ca->ref);
+ 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));
+
+ percpu_ref_put(&ca->ref);
+ 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);
+ ctx->stats.data_type = U8_MAX;
+ 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,
+ .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_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,
+ .llseek = no_llseek,
+};
+
+static long bch2_ioctl_data(struct bch_fs *c,
+ struct bch_ioctl_data arg)
+{
+ struct bch_data_ctx *ctx;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (arg.op >= BCH_DATA_OP_NR || arg.flags)
+ return -EINVAL;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->c = c;
+ ctx->arg = arg;
+
+ ret = bch2_run_thread_with_file(&ctx->thr,
+ &bcachefs_data_ops,
+ bch2_data_thread);
+ if (ret < 0)
+ kfree(ctx);
+ return ret;
+}
+
+static long bch2_ioctl_fs_usage(struct bch_fs *c,
+ struct bch_ioctl_fs_usage __user *user_arg)
+{
+ struct bch_ioctl_fs_usage *arg = NULL;
+ struct bch_replicas_usage *dst_e, *dst_end;
+ struct bch_fs_usage_online *src;
+ u32 replica_entries_bytes;
+ unsigned i;
+ 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;
+
+ arg = kzalloc(size_add(sizeof(*arg), replica_entries_bytes), GFP_KERNEL);
+ if (!arg)
+ return -ENOMEM;
+
+ src = bch2_fs_usage_read(c);
+ if (!src) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ arg->capacity = c->capacity;
+ arg->used = bch2_fs_sectors_used(c, src);
+ arg->online_reserved = src->online_reserved;
+
+ for (i = 0; i < BCH_REPLICAS_MAX; i++)
+ arg->persistent_reserved[i] = src->u.persistent_reserved[i];
+
+ dst_e = arg->replicas;
+ dst_end = (void *) arg->replicas + replica_entries_bytes;
+
+ for (i = 0; i < c->replicas.nr; i++) {
+ struct bch_replicas_entry_v1 *src_e =
+ cpu_replicas_entry(&c->replicas, i);
+
+ /* check that we have enough space for one replicas entry */
+ if (dst_e + 1 > dst_end) {
+ ret = -ERANGE;
+ break;
+ }
+
+ dst_e->sectors = src->u.replicas[i];
+ dst_e->r = *src_e;
+
+ /* recheck after setting nr_devs: */
+ if (replicas_usage_next(dst_e) > dst_end) {
+ ret = -ERANGE;
+ break;
+ }
+
+ memcpy(dst_e->r.devs, src_e->devs, src_e->nr_devs);
+
+ dst_e = replicas_usage_next(dst_e);
+ }
+
+ arg->replica_entries_bytes = (void *) dst_e - (void *) arg->replicas;
+
+ percpu_up_read(&c->mark_lock);
+ kfree(src);
+
+ if (ret)
+ goto err;
+
+ ret = copy_to_user_errcode(user_arg, arg,
+ sizeof(*arg) + arg->replica_entries_bytes);
+err:
+ kfree(arg);
+ return ret;
+}
+
+/* obsolete, didn't allow for new data types: */
+static 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 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_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 < BCH_DATA_NR; 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;
+ }
+
+ percpu_ref_put(&ca->ref);
+
+ 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 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_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:
+ percpu_ref_put(&ca->ref);
+ 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);
+
+ if (IS_ERR(ca)) {
+ ret = PTR_ERR(ca);
+ goto err;
+ }
+
+ 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:
+ if (!IS_ERR_OR_NULL(ca))
+ percpu_ref_put(&ca->ref);
+ 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;
+
+ for_each_online_member(c, ca)
+ if (ca->dev == dev) {
+ percpu_ref_put(&ca->io_ref);
+ return ca->dev_idx;
+ }
+
+ return -BCH_ERR_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);
+
+ percpu_ref_put(&ca->ref);
+ 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);
+
+ percpu_ref_put(&ca->ref);
+ return ret;
+}
+
+static int bch2_fsck_online_thread_fn(void *arg)
+{
+ struct fsck_thread *thr = container_of(arg, struct fsck_thread, thr);
+ struct bch_fs *c = thr->c;
+
+ c->stdio_filter = current;
+ c->stdio = &thr->thr.stdio;
+
+ /*
+ * XXX: can we figure out a way to do this without mucking with c->opts?
+ */
+ unsigned old_fix_errors = c->opts.fix_errors;
+ if (opt_defined(thr->opts, fix_errors))
+ c->opts.fix_errors = thr->opts.fix_errors;
+ else
+ c->opts.fix_errors = FSCK_FIX_ask;
+
+ c->opts.fsck = true;
+ set_bit(BCH_FS_fsck_running, &c->flags);
+
+ c->curr_recovery_pass = BCH_RECOVERY_PASS_check_alloc_info;
+ int ret = bch2_run_online_recovery_passes(c);
+
+ clear_bit(BCH_FS_fsck_running, &c->flags);
+ bch_err_fn(c, ret);
+
+ c->stdio = NULL;
+ c->stdio_filter = NULL;
+ c->opts.fix_errors = old_fix_errors;
+
+ thread_with_stdio_done(&thr->thr);
+
+ up(&c->online_fsck_mutex);
+ bch2_ro_ref_put(c);
+ return 0;
+}
+
+static long bch2_ioctl_fsck_online(struct bch_fs *c,
+ struct bch_ioctl_fsck_online arg)
+{
+ struct fsck_thread *thr = NULL;
+ long ret = 0;
+
+ if (arg.flags)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!bch2_ro_ref_tryget(c))
+ return -EROFS;
+
+ if (down_trylock(&c->online_fsck_mutex)) {
+ bch2_ro_ref_put(c);
+ return -EAGAIN;
+ }
+
+ thr = kzalloc(sizeof(*thr), GFP_KERNEL);
+ if (!thr) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ thr->c = c;
+ thr->opts = bch2_opts_empty();
+
+ if (arg.opts) {
+ char *optstr = strndup_user((char __user *)(unsigned long) arg.opts, 1 << 16);
+
+ ret = PTR_ERR_OR_ZERO(optstr) ?:
+ bch2_parse_mount_opts(c, &thr->opts, optstr);
+ kfree(optstr);
+
+ if (ret)
+ goto err;
+ }
+
+ ret = bch2_run_thread_with_stdio(&thr->thr,
+ bch2_fsck_thread_exit,
+ bch2_fsck_online_thread_fn);
+err:
+ if (ret < 0) {
+ bch_err_fn(c, ret);
+ if (thr)
+ bch2_fsck_thread_exit(&thr->thr);
+ up(&c->online_fsck_mutex);
+ bch2_ro_ref_put(c);
+ }
+ 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);
+ 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 struct class *bch_chardev_class;
+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)
+{
+ if (!IS_ERR_OR_NULL(bch_chardev_class))
+ device_destroy(bch_chardev_class,
+ MKDEV(bch_chardev_major, U8_MAX));
+ if (!IS_ERR_OR_NULL(bch_chardev_class))
+ class_destroy(bch_chardev_class);
+ if (bch_chardev_major > 0)
+ unregister_chrdev(bch_chardev_major, "bcachefs");
+}
+
+int __init bch2_chardev_init(void)
+{
+ bch_chardev_major = register_chrdev(0, "bcachefs-ctl", &bch_chardev_fops);
+ if (bch_chardev_major < 0)
+ return bch_chardev_major;
+
+ bch_chardev_class = class_create("bcachefs");
+ if (IS_ERR(bch_chardev_class))
+ return PTR_ERR(bch_chardev_class);
+
+ bch_chardev = device_create(bch_chardev_class, NULL,
+ MKDEV(bch_chardev_major, U8_MAX),
+ NULL, "bcachefs-ctl");
+ if (IS_ERR(bch_chardev))
+ return PTR_ERR(bch_chardev);
+
+ return 0;
+}
+
+#endif /* NO_BCACHEFS_CHARDEV */
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-28 21:01:06 +0000