Btrfs: mount ro and remount support
This patch adds mount ro and remount support. The main changes in patch are: adding btrfs_remount and related helper function; splitting the transaction related code out of close_ctree into btrfs_commit_super; updating allocator to properly handle read only block group. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng
Chris Mason
parent
f3465ca44e
commit
c146afad2c
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@ -541,6 +541,7 @@ struct btrfs_space_info {
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u64 bytes_used;
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u64 bytes_pinned;
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u64 bytes_reserved;
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u64 bytes_readonly;
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int full;
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int force_alloc;
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struct list_head list;
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@ -1075,10 +1075,12 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
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kfree(root);
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return ERR_PTR(ret);
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}
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ret = btrfs_find_dead_roots(fs_info->tree_root,
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root->root_key.objectid, root);
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BUG_ON(ret);
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if (!(fs_info->sb->s_flags & MS_RDONLY)) {
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ret = btrfs_find_dead_roots(fs_info->tree_root,
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root->root_key.objectid, root);
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BUG_ON(ret);
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btrfs_orphan_cleanup(root);
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}
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return root;
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}
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@ -1700,7 +1702,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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btrfs_read_block_groups(extent_root);
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fs_info->generation = btrfs_super_generation(disk_super) + 1;
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fs_info->generation = generation + 1;
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fs_info->last_trans_committed = generation;
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fs_info->data_alloc_profile = (u64)-1;
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fs_info->metadata_alloc_profile = (u64)-1;
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fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
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@ -1715,6 +1718,9 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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if (!fs_info->transaction_kthread)
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goto fail_cleaner;
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if (sb->s_flags & MS_RDONLY)
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return tree_root;
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if (btrfs_super_log_root(disk_super) != 0) {
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u32 blocksize;
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u64 bytenr = btrfs_super_log_root(disk_super);
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@ -1735,7 +1741,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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ret = btrfs_recover_log_trees(log_tree_root);
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BUG_ON(ret);
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}
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fs_info->last_trans_committed = btrfs_super_generation(disk_super);
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ret = btrfs_cleanup_reloc_trees(tree_root);
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BUG_ON(ret);
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@ -1955,11 +1960,56 @@ static int del_fs_roots(struct btrfs_fs_info *fs_info)
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return 0;
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}
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int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
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{
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u64 root_objectid = 0;
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struct btrfs_root *gang[8];
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int i;
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int ret;
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while (1) {
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ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
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(void **)gang, root_objectid,
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ARRAY_SIZE(gang));
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if (!ret)
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break;
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for (i = 0; i < ret; i++) {
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root_objectid = gang[i]->root_key.objectid;
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ret = btrfs_find_dead_roots(fs_info->tree_root,
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root_objectid, gang[i]);
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BUG_ON(ret);
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btrfs_orphan_cleanup(gang[i]);
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}
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root_objectid++;
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}
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return 0;
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}
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int btrfs_commit_super(struct btrfs_root *root)
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{
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struct btrfs_trans_handle *trans;
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int ret;
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mutex_lock(&root->fs_info->cleaner_mutex);
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btrfs_clean_old_snapshots(root);
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mutex_unlock(&root->fs_info->cleaner_mutex);
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trans = btrfs_start_transaction(root, 1);
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ret = btrfs_commit_transaction(trans, root);
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BUG_ON(ret);
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/* run commit again to drop the original snapshot */
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trans = btrfs_start_transaction(root, 1);
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btrfs_commit_transaction(trans, root);
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ret = btrfs_write_and_wait_transaction(NULL, root);
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BUG_ON(ret);
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ret = write_ctree_super(NULL, root);
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return ret;
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}
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int close_ctree(struct btrfs_root *root)
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{
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int ret;
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struct btrfs_trans_handle *trans;
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struct btrfs_fs_info *fs_info = root->fs_info;
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int ret;
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fs_info->closing = 1;
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smp_mb();
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@ -1967,16 +2017,12 @@ int close_ctree(struct btrfs_root *root)
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kthread_stop(root->fs_info->transaction_kthread);
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kthread_stop(root->fs_info->cleaner_kthread);
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btrfs_clean_old_snapshots(root);
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trans = btrfs_start_transaction(root, 1);
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ret = btrfs_commit_transaction(trans, root);
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/* run commit again to drop the original snapshot */
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trans = btrfs_start_transaction(root, 1);
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btrfs_commit_transaction(trans, root);
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ret = btrfs_write_and_wait_transaction(NULL, root);
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BUG_ON(ret);
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write_ctree_super(NULL, root);
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if (!(fs_info->sb->s_flags & MS_RDONLY)) {
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ret = btrfs_commit_super(root);
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if (ret) {
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printk("btrfs: commit super returns %d\n", ret);
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}
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}
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if (fs_info->delalloc_bytes) {
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printk("btrfs: at unmount delalloc count %Lu\n",
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@ -2000,12 +2046,10 @@ int close_ctree(struct btrfs_root *root)
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free_extent_buffer(root->fs_info->dev_root->node);
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btrfs_free_block_groups(root->fs_info);
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fs_info->closing = 2;
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del_fs_roots(fs_info);
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filemap_write_and_wait(fs_info->btree_inode->i_mapping);
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truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
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iput(fs_info->btree_inode);
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btrfs_stop_workers(&fs_info->fixup_workers);
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btrfs_stop_workers(&fs_info->delalloc_workers);
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@ -2014,7 +2058,6 @@ int close_ctree(struct btrfs_root *root)
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btrfs_stop_workers(&fs_info->endio_write_workers);
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btrfs_stop_workers(&fs_info->submit_workers);
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iput(fs_info->btree_inode);
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#if 0
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while(!list_empty(&fs_info->hashers)) {
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struct btrfs_hasher *hasher;
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@ -38,6 +38,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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int close_ctree(struct btrfs_root *root);
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int write_ctree_super(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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int btrfs_commit_super(struct btrfs_root *root);
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struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
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u64 bytenr, u32 blocksize);
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struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
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@ -49,6 +50,7 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
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struct btrfs_key *location);
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struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location);
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int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
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int btrfs_insert_dev_radix(struct btrfs_root *root,
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struct block_device *bdev,
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u64 device_id,
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@ -1794,7 +1794,7 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
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*space_info = found;
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return 0;
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}
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found = kmalloc(sizeof(*found), GFP_NOFS);
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found = kzalloc(sizeof(*found), GFP_NOFS);
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if (!found)
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return -ENOMEM;
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@ -1807,6 +1807,7 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
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found->bytes_used = bytes_used;
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found->bytes_pinned = 0;
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found->bytes_reserved = 0;
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found->bytes_readonly = 0;
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found->full = 0;
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found->force_alloc = 0;
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*space_info = found;
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@ -1829,6 +1830,19 @@ static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
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}
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}
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static void set_block_group_readonly(struct btrfs_block_group_cache *cache)
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{
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spin_lock(&cache->space_info->lock);
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spin_lock(&cache->lock);
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if (!cache->ro) {
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cache->space_info->bytes_readonly += cache->key.offset -
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btrfs_block_group_used(&cache->item);
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cache->ro = 1;
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}
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spin_unlock(&cache->lock);
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spin_unlock(&cache->space_info->lock);
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}
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static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags)
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{
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u64 num_devices = root->fs_info->fs_devices->num_devices;
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@ -1865,7 +1879,9 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
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u64 thresh;
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u64 start;
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u64 num_bytes;
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int ret = 0, waited = 0;
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int ret = 0;
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mutex_lock(&extent_root->fs_info->chunk_mutex);
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flags = reduce_alloc_profile(extent_root, flags);
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@ -1887,46 +1903,28 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
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goto out;
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}
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thresh = div_factor(space_info->total_bytes, 6);
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thresh = space_info->total_bytes - space_info->bytes_readonly;
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thresh = div_factor(thresh, 6);
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if (!force &&
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(space_info->bytes_used + space_info->bytes_pinned +
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space_info->bytes_reserved + alloc_bytes) < thresh) {
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spin_unlock(&space_info->lock);
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goto out;
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}
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spin_unlock(&space_info->lock);
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ret = mutex_trylock(&extent_root->fs_info->chunk_mutex);
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if (!ret && !force) {
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goto out;
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} else if (!ret) {
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mutex_lock(&extent_root->fs_info->chunk_mutex);
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waited = 1;
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}
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if (waited) {
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spin_lock(&space_info->lock);
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if (space_info->full) {
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spin_unlock(&space_info->lock);
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goto out_unlock;
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}
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spin_unlock(&space_info->lock);
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}
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ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags);
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if (ret) {
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printk("space info full %Lu\n", flags);
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space_info->full = 1;
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goto out_unlock;
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goto out;
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}
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ret = btrfs_make_block_group(trans, extent_root, 0, flags,
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BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes);
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BUG_ON(ret);
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out_unlock:
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mutex_unlock(&extent_root->fs_info->chunk_mutex);
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out:
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mutex_unlock(&extent_root->fs_info->chunk_mutex);
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return ret;
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}
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@ -1956,12 +1954,18 @@ static int update_block_group(struct btrfs_trans_handle *trans,
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if (alloc) {
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old_val += num_bytes;
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cache->space_info->bytes_used += num_bytes;
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if (cache->ro) {
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cache->space_info->bytes_readonly -= num_bytes;
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WARN_ON(1);
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}
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btrfs_set_block_group_used(&cache->item, old_val);
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spin_unlock(&cache->lock);
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spin_unlock(&cache->space_info->lock);
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} else {
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old_val -= num_bytes;
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cache->space_info->bytes_used -= num_bytes;
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if (cache->ro)
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cache->space_info->bytes_readonly += num_bytes;
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btrfs_set_block_group_used(&cache->item, old_val);
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spin_unlock(&cache->lock);
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spin_unlock(&cache->space_info->lock);
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@ -5560,8 +5564,7 @@ int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start)
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BUG_ON(IS_ERR(reloc_inode));
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__alloc_chunk_for_shrink(root, block_group, 1);
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block_group->ro = 1;
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block_group->space_info->total_bytes -= block_group->key.offset;
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set_block_group_readonly(block_group);
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btrfs_start_delalloc_inodes(info->tree_root);
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btrfs_wait_ordered_extents(info->tree_root, 0);
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@ -5868,6 +5871,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
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block_group = btrfs_lookup_block_group(root->fs_info, group_start);
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BUG_ON(!block_group);
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BUG_ON(!block_group->ro);
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memcpy(&key, &block_group->key, sizeof(key));
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@ -5881,6 +5885,11 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
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list_del(&block_group->list);
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up_write(&block_group->space_info->groups_sem);
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spin_lock(&block_group->space_info->lock);
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block_group->space_info->total_bytes -= block_group->key.offset;
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block_group->space_info->bytes_readonly -= block_group->key.offset;
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spin_unlock(&block_group->space_info->lock);
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/*
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memset(shrink_block_group, 0, sizeof(*shrink_block_group));
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kfree(shrink_block_group);
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@ -1808,10 +1808,6 @@ void btrfs_orphan_cleanup(struct btrfs_root *root)
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struct inode *inode;
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int ret = 0, nr_unlink = 0, nr_truncate = 0;
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/* don't do orphan cleanup if the fs is readonly. */
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if (root->fs_info->sb->s_flags & MS_RDONLY)
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return;
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path = btrfs_alloc_path();
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if (!path)
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return;
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@ -3050,7 +3046,7 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
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struct btrfs_root *root = bi->root;
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struct btrfs_root *sub_root = root;
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struct btrfs_key location;
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int ret, new, do_orphan = 0;
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int ret, new;
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if (dentry->d_name.len > BTRFS_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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@ -3076,13 +3072,9 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
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if (new && root != sub_root) {
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igrab(inode);
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sub_root->inode = inode;
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do_orphan = 1;
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}
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}
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if (unlikely(do_orphan))
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btrfs_orphan_cleanup(sub_root);
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return d_splice_alias(inode, dentry);
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}
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@ -3237,7 +3229,7 @@ int btrfs_write_inode(struct inode *inode, int wait)
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struct btrfs_trans_handle *trans;
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int ret = 0;
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if (root->fs_info->closing > 1)
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if (root->fs_info->btree_inode == inode)
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return 0;
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if (wait) {
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@ -4625,6 +4617,9 @@ int btrfs_start_delalloc_inodes(struct btrfs_root *root)
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struct inode *inode;
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unsigned long flags;
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if (root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
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while(!list_empty(head)) {
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binode = list_entry(head->next, struct btrfs_inode,
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@ -378,6 +378,9 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
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int namelen;
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int mod = 0;
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if (root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
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if (!vol_args)
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@ -478,6 +481,9 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
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int namelen;
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int ret;
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if (root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
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if (!vol_args)
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@ -534,6 +540,11 @@ static int btrfs_ioctl_defrag(struct file *file)
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{
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struct inode *inode = fdentry(file)->d_inode;
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struct btrfs_root *root = BTRFS_I(inode)->root;
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int ret;
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ret = mnt_want_write(file->f_path.mnt);
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if (ret)
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return ret;
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switch (inode->i_mode & S_IFMT) {
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case S_IFDIR:
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@ -575,6 +586,9 @@ long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
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struct btrfs_ioctl_vol_args *vol_args;
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int ret;
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|
||||
if (root->fs_info->sb->s_flags & MS_RDONLY)
|
||||
return -EROFS;
|
||||
|
||||
vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
|
||||
|
||||
if (!vol_args)
|
||||
|
|
@ -621,6 +635,10 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off,
|
|||
* they don't overlap)?
|
||||
*/
|
||||
|
||||
ret = mnt_want_write(file->f_path.mnt);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
src_file = fget(srcfd);
|
||||
if (!src_file)
|
||||
return -EBADF;
|
||||
|
|
@ -958,6 +976,10 @@ long btrfs_ioctl_trans_start(struct file *file)
|
|||
goto out;
|
||||
}
|
||||
|
||||
ret = mnt_want_write(file->f_path.mnt);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
mutex_lock(&root->fs_info->trans_mutex);
|
||||
root->fs_info->open_ioctl_trans++;
|
||||
mutex_unlock(&root->fs_info->trans_mutex);
|
||||
|
|
|
|||
|
|
@ -370,6 +370,9 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
|
|||
int ret;
|
||||
root = btrfs_sb(sb);
|
||||
|
||||
if (sb->s_flags & MS_RDONLY)
|
||||
return 0;
|
||||
|
||||
sb->s_dirt = 0;
|
||||
if (!wait) {
|
||||
filemap_flush(root->fs_info->btree_inode->i_mapping);
|
||||
|
|
@ -438,7 +441,7 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
|
|||
up_write(&s->s_umount);
|
||||
deactivate_super(s);
|
||||
error = -EBUSY;
|
||||
goto error_bdev;
|
||||
goto error_close_devices;
|
||||
}
|
||||
|
||||
} else {
|
||||
|
|
@ -487,7 +490,7 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
|
|||
|
||||
error_s:
|
||||
error = PTR_ERR(s);
|
||||
error_bdev:
|
||||
error_close_devices:
|
||||
btrfs_close_devices(fs_devices);
|
||||
error_free_subvol_name:
|
||||
kfree(subvol_name);
|
||||
|
|
@ -495,6 +498,35 @@ error:
|
|||
return error;
|
||||
}
|
||||
|
||||
static int btrfs_remount(struct super_block *sb, int *flags, char *data)
|
||||
{
|
||||
struct btrfs_root *root = btrfs_sb(sb);
|
||||
int ret;
|
||||
|
||||
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
|
||||
return 0;
|
||||
|
||||
if (*flags & MS_RDONLY) {
|
||||
sb->s_flags |= MS_RDONLY;
|
||||
|
||||
ret = btrfs_commit_super(root);
|
||||
WARN_ON(ret);
|
||||
} else {
|
||||
if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
|
||||
return -EINVAL;
|
||||
|
||||
ret = btrfs_cleanup_reloc_trees(root);
|
||||
WARN_ON(ret);
|
||||
|
||||
ret = btrfs_cleanup_fs_roots(root->fs_info);
|
||||
WARN_ON(ret);
|
||||
|
||||
sb->s_flags &= ~MS_RDONLY;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
||||
{
|
||||
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
|
||||
|
|
@ -582,6 +614,7 @@ static struct super_operations btrfs_super_ops = {
|
|||
.alloc_inode = btrfs_alloc_inode,
|
||||
.destroy_inode = btrfs_destroy_inode,
|
||||
.statfs = btrfs_statfs,
|
||||
.remount_fs = btrfs_remount,
|
||||
.write_super_lockfs = btrfs_write_super_lockfs,
|
||||
.unlockfs = btrfs_unlockfs,
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue