mirror of https://gitee.com/openkylin/linux.git
Btrfs: add basic restriper infrastructure
Add basic restriper infrastructure: extended balancing ioctl and all related ioctl data structures, add data structure for tracking restriper's state to fs_info, etc. The semantics of the old balancing ioctl are fully preserved. Explicitly disallow any volume operations when balance is in progress. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
parent
10ea00f55a
commit
c9e9f97bdf
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@ -934,6 +934,7 @@ struct btrfs_block_group_cache {
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struct reloc_control;
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struct btrfs_device;
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struct btrfs_fs_devices;
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struct btrfs_balance_control;
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struct btrfs_delayed_root;
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struct btrfs_fs_info {
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u8 fsid[BTRFS_FSID_SIZE];
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@ -1159,6 +1160,11 @@ struct btrfs_fs_info {
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u64 avail_metadata_alloc_bits;
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u64 avail_system_alloc_bits;
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/* restriper state */
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spinlock_t balance_lock;
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struct mutex balance_mutex;
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struct btrfs_balance_control *balance_ctl;
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unsigned data_chunk_allocations;
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unsigned metadata_ratio;
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@ -2002,6 +2002,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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init_rwsem(&fs_info->scrub_super_lock);
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fs_info->scrub_workers_refcnt = 0;
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spin_lock_init(&fs_info->balance_lock);
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mutex_init(&fs_info->balance_mutex);
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fs_info->balance_ctl = NULL;
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sb->s_blocksize = 4096;
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sb->s_blocksize_bits = blksize_bits(4096);
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sb->s_bdi = &fs_info->bdi;
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135
fs/btrfs/ioctl.c
135
fs/btrfs/ioctl.c
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@ -1203,13 +1203,21 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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mutex_lock(&root->fs_info->volume_mutex);
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if (root->fs_info->balance_ctl) {
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printk(KERN_INFO "btrfs: balance in progress\n");
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ret = -EINVAL;
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goto out;
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}
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vol_args = memdup_user(arg, sizeof(*vol_args));
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if (IS_ERR(vol_args))
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return PTR_ERR(vol_args);
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if (IS_ERR(vol_args)) {
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ret = PTR_ERR(vol_args);
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goto out;
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}
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vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
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mutex_lock(&root->fs_info->volume_mutex);
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sizestr = vol_args->name;
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devstr = strchr(sizestr, ':');
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if (devstr) {
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@ -1226,7 +1234,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
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printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
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(unsigned long long)devid);
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ret = -EINVAL;
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goto out_unlock;
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goto out_free;
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}
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if (!strcmp(sizestr, "max"))
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new_size = device->bdev->bd_inode->i_size;
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@ -1241,7 +1249,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
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new_size = memparse(sizestr, NULL);
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if (new_size == 0) {
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ret = -EINVAL;
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goto out_unlock;
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goto out_free;
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}
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}
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@ -1250,7 +1258,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
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if (mod < 0) {
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if (new_size > old_size) {
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ret = -EINVAL;
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goto out_unlock;
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goto out_free;
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}
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new_size = old_size - new_size;
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} else if (mod > 0) {
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@ -1259,11 +1267,11 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
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if (new_size < 256 * 1024 * 1024) {
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ret = -EINVAL;
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goto out_unlock;
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goto out_free;
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}
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if (new_size > device->bdev->bd_inode->i_size) {
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ret = -EFBIG;
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goto out_unlock;
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goto out_free;
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}
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do_div(new_size, root->sectorsize);
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@ -1276,7 +1284,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
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trans = btrfs_start_transaction(root, 0);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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goto out_unlock;
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goto out_free;
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}
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ret = btrfs_grow_device(trans, device, new_size);
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btrfs_commit_transaction(trans, root);
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@ -1284,9 +1292,10 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
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ret = btrfs_shrink_device(device, new_size);
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}
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out_unlock:
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mutex_unlock(&root->fs_info->volume_mutex);
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out_free:
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kfree(vol_args);
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out:
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mutex_unlock(&root->fs_info->volume_mutex);
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return ret;
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}
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@ -2052,14 +2061,25 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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mutex_lock(&root->fs_info->volume_mutex);
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if (root->fs_info->balance_ctl) {
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printk(KERN_INFO "btrfs: balance in progress\n");
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ret = -EINVAL;
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goto out;
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}
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vol_args = memdup_user(arg, sizeof(*vol_args));
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if (IS_ERR(vol_args))
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return PTR_ERR(vol_args);
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if (IS_ERR(vol_args)) {
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ret = PTR_ERR(vol_args);
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goto out;
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}
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vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
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ret = btrfs_init_new_device(root, vol_args->name);
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kfree(vol_args);
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out:
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mutex_unlock(&root->fs_info->volume_mutex);
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return ret;
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}
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@ -2074,14 +2094,25 @@ static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
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if (root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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mutex_lock(&root->fs_info->volume_mutex);
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if (root->fs_info->balance_ctl) {
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printk(KERN_INFO "btrfs: balance in progress\n");
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ret = -EINVAL;
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goto out;
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}
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vol_args = memdup_user(arg, sizeof(*vol_args));
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if (IS_ERR(vol_args))
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return PTR_ERR(vol_args);
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if (IS_ERR(vol_args)) {
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ret = PTR_ERR(vol_args);
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goto out;
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}
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vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
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ret = btrfs_rm_device(root, vol_args->name);
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kfree(vol_args);
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out:
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mutex_unlock(&root->fs_info->volume_mutex);
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return ret;
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}
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@ -3034,6 +3065,76 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
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return ret;
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}
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void update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
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struct btrfs_ioctl_balance_args *bargs)
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{
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struct btrfs_balance_control *bctl = fs_info->balance_ctl;
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bargs->flags = bctl->flags;
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memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
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memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
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memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
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}
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static long btrfs_ioctl_balance(struct btrfs_root *root, void __user *arg)
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{
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struct btrfs_fs_info *fs_info = root->fs_info;
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struct btrfs_ioctl_balance_args *bargs;
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struct btrfs_balance_control *bctl;
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int ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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mutex_lock(&fs_info->volume_mutex);
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mutex_lock(&fs_info->balance_mutex);
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if (arg) {
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bargs = memdup_user(arg, sizeof(*bargs));
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if (IS_ERR(bargs)) {
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ret = PTR_ERR(bargs);
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goto out;
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}
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} else {
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bargs = NULL;
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}
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bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
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if (!bctl) {
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ret = -ENOMEM;
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goto out_bargs;
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}
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bctl->fs_info = fs_info;
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if (arg) {
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memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
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memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
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memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
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bctl->flags = bargs->flags;
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}
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ret = btrfs_balance(bctl, bargs);
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/*
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* bctl is freed in __cancel_balance
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*/
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if (arg) {
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if (copy_to_user(arg, bargs, sizeof(*bargs)))
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ret = -EFAULT;
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}
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out_bargs:
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kfree(bargs);
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out:
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mutex_unlock(&fs_info->balance_mutex);
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mutex_unlock(&fs_info->volume_mutex);
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return ret;
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}
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long btrfs_ioctl(struct file *file, unsigned int
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cmd, unsigned long arg)
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{
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@ -3078,7 +3179,7 @@ long btrfs_ioctl(struct file *file, unsigned int
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case BTRFS_IOC_DEV_INFO:
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return btrfs_ioctl_dev_info(root, argp);
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case BTRFS_IOC_BALANCE:
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return btrfs_balance(root->fs_info->dev_root);
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return btrfs_ioctl_balance(root, NULL);
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case BTRFS_IOC_CLONE:
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return btrfs_ioctl_clone(file, arg, 0, 0, 0);
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case BTRFS_IOC_CLONE_RANGE:
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@ -3110,6 +3211,8 @@ long btrfs_ioctl(struct file *file, unsigned int
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return btrfs_ioctl_scrub_cancel(root, argp);
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case BTRFS_IOC_SCRUB_PROGRESS:
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return btrfs_ioctl_scrub_progress(root, argp);
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case BTRFS_IOC_BALANCE_V2:
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return btrfs_ioctl_balance(root, argp);
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}
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return -ENOTTY;
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@ -109,6 +109,47 @@ struct btrfs_ioctl_fs_info_args {
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__u64 reserved[124]; /* pad to 1k */
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};
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/*
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* this is packed, because it should be exactly the same as its disk
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* byte order counterpart (struct btrfs_disk_balance_args)
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*/
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struct btrfs_balance_args {
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__u64 profiles;
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__u64 usage;
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__u64 devid;
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__u64 pstart;
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__u64 pend;
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__u64 vstart;
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__u64 vend;
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__u64 target;
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__u64 flags;
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__u64 unused[8];
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} __attribute__ ((__packed__));
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/* report balance progress to userspace */
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struct btrfs_balance_progress {
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__u64 expected; /* estimated # of chunks that will be
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* relocated to fulfill the request */
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__u64 considered; /* # of chunks we have considered so far */
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__u64 completed; /* # of chunks relocated so far */
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};
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struct btrfs_ioctl_balance_args {
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__u64 flags; /* in/out */
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__u64 state; /* out */
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struct btrfs_balance_args data; /* in/out */
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struct btrfs_balance_args meta; /* in/out */
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struct btrfs_balance_args sys; /* in/out */
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struct btrfs_balance_progress stat; /* out */
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__u64 unused[72]; /* pad to 1k */
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};
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#define BTRFS_INO_LOOKUP_PATH_MAX 4080
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struct btrfs_ioctl_ino_lookup_args {
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__u64 treeid;
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@ -272,6 +313,8 @@ struct btrfs_ioctl_logical_ino_args {
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struct btrfs_ioctl_dev_info_args)
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#define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
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struct btrfs_ioctl_fs_info_args)
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#define BTRFS_IOC_BALANCE_V2 _IOWR(BTRFS_IOCTL_MAGIC, 32, \
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struct btrfs_ioctl_balance_args)
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#define BTRFS_IOC_INO_PATHS _IOWR(BTRFS_IOCTL_MAGIC, 35, \
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struct btrfs_ioctl_ino_path_args)
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#define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
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@ -1282,7 +1282,6 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
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bool clear_super = false;
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mutex_lock(&uuid_mutex);
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mutex_lock(&root->fs_info->volume_mutex);
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all_avail = root->fs_info->avail_data_alloc_bits |
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root->fs_info->avail_system_alloc_bits |
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@ -1452,7 +1451,6 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
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if (bdev)
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blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
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out:
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mutex_unlock(&root->fs_info->volume_mutex);
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mutex_unlock(&uuid_mutex);
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return ret;
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error_undo:
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@ -1629,7 +1627,6 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
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}
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filemap_write_and_wait(bdev->bd_inode->i_mapping);
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mutex_lock(&root->fs_info->volume_mutex);
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devices = &root->fs_info->fs_devices->devices;
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/*
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@ -1757,8 +1754,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
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ret = btrfs_relocate_sys_chunks(root);
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BUG_ON(ret);
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}
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out:
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mutex_unlock(&root->fs_info->volume_mutex);
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return ret;
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error:
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blkdev_put(bdev, FMODE_EXCL);
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@ -1766,7 +1762,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
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mutex_unlock(&uuid_mutex);
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up_write(&sb->s_umount);
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}
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goto out;
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return ret;
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}
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static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
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@ -2077,6 +2073,35 @@ static int btrfs_relocate_sys_chunks(struct btrfs_root *root)
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return ret;
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}
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/*
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* Should be called with both balance and volume mutexes held to
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* serialize other volume operations (add_dev/rm_dev/resize) with
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* restriper. Same goes for unset_balance_control.
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*/
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static void set_balance_control(struct btrfs_balance_control *bctl)
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{
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struct btrfs_fs_info *fs_info = bctl->fs_info;
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BUG_ON(fs_info->balance_ctl);
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spin_lock(&fs_info->balance_lock);
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fs_info->balance_ctl = bctl;
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spin_unlock(&fs_info->balance_lock);
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}
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static void unset_balance_control(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_balance_control *bctl = fs_info->balance_ctl;
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BUG_ON(!fs_info->balance_ctl);
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spin_lock(&fs_info->balance_lock);
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fs_info->balance_ctl = NULL;
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spin_unlock(&fs_info->balance_lock);
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kfree(bctl);
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}
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static u64 div_factor(u64 num, int factor)
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{
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if (factor == 10)
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@ -2086,29 +2111,23 @@ static u64 div_factor(u64 num, int factor)
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return num;
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}
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int btrfs_balance(struct btrfs_root *dev_root)
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static int __btrfs_balance(struct btrfs_fs_info *fs_info)
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{
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int ret;
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struct list_head *devices = &dev_root->fs_info->fs_devices->devices;
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struct btrfs_root *chunk_root = fs_info->chunk_root;
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struct btrfs_root *dev_root = fs_info->dev_root;
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struct list_head *devices;
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struct btrfs_device *device;
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u64 old_size;
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u64 size_to_free;
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root;
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struct btrfs_trans_handle *trans;
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struct btrfs_key found_key;
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if (dev_root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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|
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if (!capable(CAP_SYS_ADMIN))
|
||||
return -EPERM;
|
||||
|
||||
mutex_lock(&dev_root->fs_info->volume_mutex);
|
||||
dev_root = dev_root->fs_info->dev_root;
|
||||
struct btrfs_trans_handle *trans;
|
||||
int ret;
|
||||
int enospc_errors = 0;
|
||||
|
||||
/* step one make some room on all the devices */
|
||||
devices = &fs_info->fs_devices->devices;
|
||||
list_for_each_entry(device, devices, dev_list) {
|
||||
old_size = device->total_bytes;
|
||||
size_to_free = div_factor(old_size, 1);
|
||||
|
|
@ -2151,12 +2170,14 @@ int btrfs_balance(struct btrfs_root *dev_root)
|
|||
* failed
|
||||
*/
|
||||
if (ret == 0)
|
||||
break;
|
||||
BUG(); /* FIXME break ? */
|
||||
|
||||
ret = btrfs_previous_item(chunk_root, path, 0,
|
||||
BTRFS_CHUNK_ITEM_KEY);
|
||||
if (ret)
|
||||
if (ret) {
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
||||
path->slots[0]);
|
||||
|
|
@ -2174,12 +2195,63 @@ int btrfs_balance(struct btrfs_root *dev_root)
|
|||
found_key.offset);
|
||||
if (ret && ret != -ENOSPC)
|
||||
goto error;
|
||||
if (ret == -ENOSPC)
|
||||
enospc_errors++;
|
||||
key.offset = found_key.offset - 1;
|
||||
}
|
||||
ret = 0;
|
||||
|
||||
error:
|
||||
btrfs_free_path(path);
|
||||
mutex_unlock(&dev_root->fs_info->volume_mutex);
|
||||
if (enospc_errors) {
|
||||
printk(KERN_INFO "btrfs: %d enospc errors during balance\n",
|
||||
enospc_errors);
|
||||
if (!ret)
|
||||
ret = -ENOSPC;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __cancel_balance(struct btrfs_fs_info *fs_info)
|
||||
{
|
||||
unset_balance_control(fs_info);
|
||||
}
|
||||
|
||||
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
|
||||
struct btrfs_ioctl_balance_args *bargs);
|
||||
|
||||
/*
|
||||
* Should be called with both balance and volume mutexes held
|
||||
*/
|
||||
int btrfs_balance(struct btrfs_balance_control *bctl,
|
||||
struct btrfs_ioctl_balance_args *bargs)
|
||||
{
|
||||
struct btrfs_fs_info *fs_info = bctl->fs_info;
|
||||
int ret;
|
||||
|
||||
if (btrfs_fs_closing(fs_info)) {
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
set_balance_control(bctl);
|
||||
|
||||
mutex_unlock(&fs_info->balance_mutex);
|
||||
|
||||
ret = __btrfs_balance(fs_info);
|
||||
|
||||
mutex_lock(&fs_info->balance_mutex);
|
||||
|
||||
if (bargs) {
|
||||
memset(bargs, 0, sizeof(*bargs));
|
||||
update_ioctl_balance_args(fs_info, bargs);
|
||||
}
|
||||
|
||||
__cancel_balance(fs_info);
|
||||
|
||||
return ret;
|
||||
out:
|
||||
kfree(bctl);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -186,6 +186,17 @@ struct map_lookup {
|
|||
#define map_lookup_size(n) (sizeof(struct map_lookup) + \
|
||||
(sizeof(struct btrfs_bio_stripe) * (n)))
|
||||
|
||||
struct btrfs_balance_args;
|
||||
struct btrfs_balance_control {
|
||||
struct btrfs_fs_info *fs_info;
|
||||
|
||||
struct btrfs_balance_args data;
|
||||
struct btrfs_balance_args meta;
|
||||
struct btrfs_balance_args sys;
|
||||
|
||||
u64 flags;
|
||||
};
|
||||
|
||||
int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
|
||||
u64 end, u64 *length);
|
||||
|
||||
|
|
@ -228,7 +239,8 @@ struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
|
|||
u8 *uuid, u8 *fsid);
|
||||
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
|
||||
int btrfs_init_new_device(struct btrfs_root *root, char *path);
|
||||
int btrfs_balance(struct btrfs_root *dev_root);
|
||||
int btrfs_balance(struct btrfs_balance_control *bctl,
|
||||
struct btrfs_ioctl_balance_args *bargs);
|
||||
int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
|
||||
int find_free_dev_extent(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_device *device, u64 num_bytes,
|
||||
|
|
|
|||
Loading…
Reference in New Issue