+++ /dev/null
-#ifndef NO_BCACHEFS_CHARDEV
-
-#include "bcachefs.h"
-#include "alloc.h"
-#include "bcachefs_ioctl.h"
-#include "buckets.h"
-#include "chardev.h"
-#include "move.h"
-#include "super.h"
-#include "super-io.h"
-
-#include <linux/anon_inodes.h>
-#include <linux/cdev.h>
-#include <linux/device.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/ioctl.h>
-#include <linux/kthread.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);
-
- 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 {
- struct block_device *bdev;
- char *path;
- unsigned i;
-
- path = strndup_user((const char __user *)
- (unsigned long) dev, PATH_MAX);
- if (IS_ERR(path))
- return ERR_CAST(path);
-
- bdev = lookup_bdev(path);
- kfree(path);
- if (IS_ERR(bdev))
- return ERR_CAST(bdev);
-
- for_each_member_device(ca, c, i)
- if (ca->disk_sb.bdev == bdev)
- goto found;
-
- ca = ERR_PTR(-ENOENT);
-found:
- bdput(bdev);
- }
-
- return ca;
-}
-
-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);
- if (!devs[i]) {
- ret = -ENOMEM;
- 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);
- if (!path)
- return -ENOMEM;
-
- err = bch2_fs_open_incremental(path);
- kfree(path);
-
- if (err) {
- pr_err("Could not register bcachefs devices: %s", err);
- return -EINVAL;
- }
-
- return 0;
-}
-
-static long bch2_global_ioctl(unsigned cmd, void __user *arg)
-{
- switch (cmd) {
- case BCH_IOCTL_ASSEMBLE:
- return bch2_ioctl_assemble(arg);
- case BCH_IOCTL_INCREMENTAL:
- return bch2_ioctl_incremental(arg);
- default:
- return -ENOTTY;
- }
-}
-
-static long bch2_ioctl_query_uuid(struct bch_fs *c,
- struct bch_ioctl_query_uuid __user *user_arg)
-{
- return copy_to_user(&user_arg->uuid,
- &c->sb.user_uuid,
- sizeof(c->sb.user_uuid));
-}
-
-static long bch2_ioctl_start(struct bch_fs *c, struct bch_ioctl_start arg)
-{
- if (arg.flags || arg.pad)
- return -EINVAL;
-
- return bch2_fs_start(c) ? -EIO : 0;
-}
-
-static long bch2_ioctl_stop(struct bch_fs *c)
-{
- bch2_fs_stop(c);
- return 0;
-}
-
-static long bch2_ioctl_disk_add(struct bch_fs *c, struct bch_ioctl_disk arg)
-{
- char *path;
- int ret;
-
- if (arg.flags || arg.pad)
- return -EINVAL;
-
- path = strndup_user((const char __user *)(unsigned long) arg.dev, PATH_MAX);
- if (!path)
- return -ENOMEM;
-
- 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 ((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 (arg.flags || arg.pad)
- return -EINVAL;
-
- path = strndup_user((const char __user *)(unsigned long) arg.dev, PATH_MAX);
- if (!path)
- return -ENOMEM;
-
- 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 ((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 ((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])
- 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);
-
- percpu_ref_put(&ca->ref);
- return ret;
-}
-
-struct bch_data_ctx {
- struct bch_fs *c;
- struct bch_ioctl_data arg;
- struct bch_move_stats stats;
-
- int ret;
-
- struct task_struct *thread;
-};
-
-static int bch2_data_thread(void *arg)
-{
- struct bch_data_ctx *ctx = arg;
-
- ctx->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 = file->private_data;
-
- kthread_stop(ctx->thread);
- put_task_struct(ctx->thread);
- 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 = file->private_data;
- struct bch_fs *c = ctx->c;
- struct bch_ioctl_data_progress p = {
- .data_type = ctx->stats.data_type,
- .btree_id = ctx->stats.iter.btree_id,
- .pos = ctx->stats.iter.pos,
- .sectors_done = atomic64_read(&ctx->stats.sectors_seen),
- .sectors_total = bch2_fs_sectors_used(c, bch2_fs_usage_read(c)),
- };
-
- if (len != sizeof(p))
- return -EINVAL;
-
- return copy_to_user(buf, &p, sizeof(p)) ?: sizeof(p);
-}
-
-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 = NULL;
- struct file *file = NULL;
- unsigned flags = O_RDONLY|O_CLOEXEC|O_NONBLOCK;
- int ret, fd = -1;
-
- 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;
-
- ctx->thread = kthread_create(bch2_data_thread, ctx, "[bcachefs]");
- if (IS_ERR(ctx->thread)) {
- ret = PTR_ERR(ctx->thread);
- goto err;
- }
-
- ret = get_unused_fd_flags(flags);
- if (ret < 0)
- goto err;
- fd = ret;
-
- file = anon_inode_getfile("[bcachefs]", &bcachefs_data_ops, ctx, flags);
- if (IS_ERR(file)) {
- ret = PTR_ERR(file);
- goto err;
- }
-
- fd_install(fd, file);
-
- get_task_struct(ctx->thread);
- wake_up_process(ctx->thread);
-
- return fd;
-err:
- if (fd >= 0)
- put_unused_fd(fd);
- if (!IS_ERR_OR_NULL(ctx->thread))
- kthread_stop(ctx->thread);
- kfree(ctx);
- return ret;
-}
-
-static long bch2_ioctl_usage(struct bch_fs *c,
- struct bch_ioctl_usage __user *user_arg)
-{
- struct bch_ioctl_usage arg;
- struct bch_dev *ca;
- unsigned i, j;
- int ret;
-
- if (copy_from_user(&arg, user_arg, sizeof(arg)))
- return -EFAULT;
-
- for (i = 0; i < arg.nr_devices; i++) {
- struct bch_ioctl_dev_usage dst = { .alive = 0 };
-
- ret = copy_to_user(&user_arg->devs[i], &dst, sizeof(dst));
- if (ret)
- return ret;
- }
-
- {
- struct bch_fs_usage src = bch2_fs_usage_read(c);
- struct bch_ioctl_fs_usage dst = {
- .capacity = c->capacity,
- .used = bch2_fs_sectors_used(c, src),
- .online_reserved = src.online_reserved,
- };
-
- for (i = 0; i < BCH_REPLICAS_MAX; i++) {
- dst.persistent_reserved[i] =
- src.s[i].persistent_reserved;
-
- for (j = 0; j < S_ALLOC_NR; j++)
- dst.sectors[s_alloc_to_data_type(j)][i] =
- src.s[i].data[j];
- }
-
- ret = copy_to_user(&user_arg->fs, &dst, sizeof(dst));
- if (ret)
- return ret;
- }
-
- for_each_member_device(ca, c, i) {
- struct bch_dev_usage src = bch2_dev_usage_read(c, ca);
- struct bch_ioctl_dev_usage dst = {
- .alive = 1,
- .state = ca->mi.state,
- .bucket_size = ca->mi.bucket_size,
- .nr_buckets = ca->mi.nbuckets - ca->mi.first_bucket,
- };
-
- if (ca->dev_idx >= arg.nr_devices) {
- percpu_ref_put(&ca->ref);
- return -ENOSPC;
- }
-
- if (percpu_ref_tryget(&ca->io_ref)) {
- dst.dev = huge_encode_dev(ca->disk_sb.bdev->bd_dev);
- percpu_ref_put(&ca->io_ref);
- }
-
- for (j = 0; j < BCH_DATA_NR; j++) {
- dst.buckets[j] = src.buckets[j];
- dst.sectors[j] = src.sectors[j];
- }
-
- ret = copy_to_user(&user_arg->devs[i], &dst, sizeof(dst));
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-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 ((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;
- }
-
- if (vstruct_bytes(sb) > arg.size) {
- ret = -ERANGE;
- goto err;
- }
-
- ret = copy_to_user((void __user *)(unsigned long)arg.sb,
- sb, vstruct_bytes(sb));
-err:
- if (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);
- struct bch_dev *ca;
- unsigned i;
-
- for_each_online_member(ca, c, i)
- if (ca->disk_sb.bdev->bd_dev == dev) {
- percpu_ref_put(&ca->io_ref);
- return i;
- }
-
- return -ENOENT;
-}
-
-static long bch2_ioctl_disk_resize(struct bch_fs *c,
- struct bch_ioctl_disk_resize arg)
-{
- struct bch_dev *ca;
- int ret;
-
- 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;
-}
-
-#define BCH_IOCTL(_name, _argtype) \
-do { \
- _argtype i; \
- \
- if (copy_from_user(&i, arg, sizeof(i))) \
- return -EFAULT; \
- return bch2_ioctl_##_name(c, i); \
-} while (0)
-
-long bch2_fs_ioctl(struct bch_fs *c, unsigned cmd, void __user *arg)
-{
- /* ioctls that don't require admin cap: */
- switch (cmd) {
- case BCH_IOCTL_QUERY_UUID:
- return bch2_ioctl_query_uuid(c, arg);
- case BCH_IOCTL_USAGE:
- return bch2_ioctl_usage(c, arg);
- }
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- /* ioctls that do require admin cap: */
- switch (cmd) {
- case BCH_IOCTL_START:
- BCH_IOCTL(start, struct bch_ioctl_start);
- case BCH_IOCTL_STOP:
- return bch2_ioctl_stop(c);
-
- 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_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);
- case BCH_IOCTL_DISK_RESIZE:
- BCH_IOCTL(disk_resize, struct bch_ioctl_disk_resize);
-
- default:
- return -ENOTTY;
- }
-}
-
-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(THIS_MODULE, "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 */
projects / bcachefs-tools-debian / blobdiff