mirror of https://gitee.com/openkylin/linux.git
Btrfs: Support for online FS resize (grow and shrink)
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
parent
5d4fb734b4
commit
edbd8d4efe
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@ -508,6 +508,8 @@ BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
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used, 64);
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BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
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used, 64);
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BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
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flags, 8);
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/* struct btrfs_inode_ref */
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BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
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@ -960,6 +962,9 @@ struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
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int level,
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u64 hint,
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u64 empty_size);
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int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 new_size);
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int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
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int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 bytenr,
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@ -1117,6 +1122,9 @@ int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct btrfs_path *path,
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u64 isize);
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/* inode.c */
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unsigned long btrfs_force_ra(struct address_space *mapping,
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struct file_ra_state *ra, struct file *file,
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pgoff_t offset, pgoff_t last_index);
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int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
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int for_del);
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int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
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@ -1162,4 +1170,6 @@ void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
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ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
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int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct inode *inode);
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/* super.c */
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u64 btrfs_parse_size(char *str);
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#endif
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@ -471,13 +471,17 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
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return root;
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}
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struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location,
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const char *name, int namelen)
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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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{
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struct btrfs_root *root;
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int ret;
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if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
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return fs_info->tree_root;
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if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
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return fs_info->extent_root;
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root = radix_tree_lookup(&fs_info->fs_roots_radix,
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(unsigned long)location->objectid);
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if (root)
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@ -494,6 +498,23 @@ struct btrfs_root *btrfs_read_fs_root(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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return root;
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}
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struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location,
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const char *name, int namelen)
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{
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struct btrfs_root *root;
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int ret;
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root = btrfs_read_fs_root_no_name(fs_info, location);
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if (!root)
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return NULL;
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ret = btrfs_set_root_name(root, name, namelen);
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if (ret) {
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@ -509,11 +530,6 @@ struct btrfs_root *btrfs_read_fs_root(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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return root;
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}
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#if 0
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@ -39,6 +39,8 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
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const char *name, int namelen);
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struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
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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_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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@ -18,6 +18,7 @@
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#include <linux/sched.h>
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#include <linux/crc32c.h>
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#include <linux/pagemap.h>
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#include "hash.h"
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#include "ctree.h"
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#include "disk-io.h"
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@ -1622,6 +1623,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
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int pending_ret;
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u64 super_used, root_used;
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u64 search_start = 0;
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u64 new_hint;
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struct btrfs_fs_info *info = root->fs_info;
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struct btrfs_root *extent_root = info->extent_root;
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struct btrfs_extent_item extent_item;
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@ -1629,6 +1631,10 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
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btrfs_set_stack_extent_refs(&extent_item, 1);
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new_hint = max(hint_byte, 16ULL * 1024 * 1024 * 1024);
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if (new_hint < btrfs_super_total_bytes(&info->super_copy))
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hint_byte = new_hint;
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WARN_ON(num_bytes < root->sectorsize);
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ret = find_free_extent(trans, root, num_bytes, empty_size,
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search_start, search_end, hint_byte, ins,
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@ -2100,6 +2106,480 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
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return 0;
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}
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static int relocate_inode_pages(struct inode *inode, u64 start, u64 len)
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{
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u64 page_start;
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u64 page_end;
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u64 delalloc_start;
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u64 existing_delalloc;
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unsigned long last_index;
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unsigned long first_index;
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unsigned long i;
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struct page *page;
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
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struct file_ra_state ra;
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mutex_lock(&inode->i_mutex);
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first_index = start >> PAGE_CACHE_SHIFT;
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last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
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memset(&ra, 0, sizeof(ra));
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file_ra_state_init(&ra, inode->i_mapping);
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btrfs_force_ra(inode->i_mapping, &ra, NULL, first_index, last_index);
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for (i = first_index; i <= last_index; i++) {
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page = grab_cache_page(inode->i_mapping, i);
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if (!page)
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goto out_unlock;
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if (!PageUptodate(page)) {
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btrfs_readpage(NULL, page);
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lock_page(page);
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if (!PageUptodate(page)) {
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unlock_page(page);
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page_cache_release(page);
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goto out_unlock;
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}
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}
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page_start = (u64)page->index << PAGE_CACHE_SHIFT;
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page_end = page_start + PAGE_CACHE_SIZE - 1;
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lock_extent(em_tree, page_start, page_end, GFP_NOFS);
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delalloc_start = page_start;
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existing_delalloc =
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count_range_bits(&BTRFS_I(inode)->extent_tree,
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&delalloc_start, page_end,
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PAGE_CACHE_SIZE, EXTENT_DELALLOC);
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set_extent_delalloc(em_tree, page_start,
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page_end, GFP_NOFS);
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spin_lock(&root->fs_info->delalloc_lock);
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root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
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existing_delalloc;
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spin_unlock(&root->fs_info->delalloc_lock);
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unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
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set_page_dirty(page);
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unlock_page(page);
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page_cache_release(page);
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}
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out_unlock:
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mutex_unlock(&inode->i_mutex);
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return 0;
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}
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static int relocate_one_reference(struct btrfs_root *extent_root,
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struct btrfs_path *path,
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struct btrfs_key *extent_key,
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u64 ref_root, u64 ref_gen, u64 ref_objectid,
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u64 ref_offset)
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{
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struct inode *inode;
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struct btrfs_root *found_root;
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struct btrfs_key root_location;
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int ret;
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root_location.objectid = ref_root;
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if (ref_gen == 0)
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root_location.offset = 0;
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else
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root_location.offset = (u64)-1;
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root_location.type = BTRFS_ROOT_ITEM_KEY;
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found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
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&root_location);
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BUG_ON(!found_root);
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if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
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mutex_unlock(&extent_root->fs_info->fs_mutex);
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inode = btrfs_iget_locked(extent_root->fs_info->sb,
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ref_objectid, found_root);
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if (inode->i_state & I_NEW) {
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/* the inode and parent dir are two different roots */
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BTRFS_I(inode)->root = found_root;
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BTRFS_I(inode)->location.objectid = ref_objectid;
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BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
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BTRFS_I(inode)->location.offset = 0;
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btrfs_read_locked_inode(inode);
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unlock_new_inode(inode);
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}
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/* this can happen if the reference is not against
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* the latest version of the tree root
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*/
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if (is_bad_inode(inode)) {
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mutex_lock(&extent_root->fs_info->fs_mutex);
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goto out;
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}
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relocate_inode_pages(inode, ref_offset, extent_key->offset);
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/* FIXME, data=ordered will help get rid of this */
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filemap_fdatawrite(inode->i_mapping);
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iput(inode);
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mutex_lock(&extent_root->fs_info->fs_mutex);
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} else {
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struct btrfs_trans_handle *trans;
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struct btrfs_key found_key;
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struct extent_buffer *eb;
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int level;
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int i;
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trans = btrfs_start_transaction(found_root, 1);
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eb = read_tree_block(found_root, extent_key->objectid,
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extent_key->offset);
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level = btrfs_header_level(eb);
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if (level == 0)
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btrfs_item_key_to_cpu(eb, &found_key, 0);
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else
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btrfs_node_key_to_cpu(eb, &found_key, 0);
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free_extent_buffer(eb);
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path->lowest_level = level;
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path->reada = 0;
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ret = btrfs_search_slot(trans, found_root, &found_key, path,
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0, 1);
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path->lowest_level = 0;
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for (i = level; i < BTRFS_MAX_LEVEL; i++) {
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if (!path->nodes[i])
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break;
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free_extent_buffer(path->nodes[i]);
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path->nodes[i] = NULL;
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}
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btrfs_release_path(found_root, path);
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btrfs_end_transaction(trans, found_root);
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}
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out:
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return 0;
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}
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static int relocate_one_extent(struct btrfs_root *extent_root,
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struct btrfs_path *path,
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struct btrfs_key *extent_key)
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{
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struct btrfs_key key;
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struct btrfs_key found_key;
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struct btrfs_extent_ref *ref;
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struct extent_buffer *leaf;
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u64 ref_root;
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u64 ref_gen;
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u64 ref_objectid;
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u64 ref_offset;
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u32 nritems;
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u32 item_size;
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int ret = 0;
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key.objectid = extent_key->objectid;
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key.type = BTRFS_EXTENT_REF_KEY;
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key.offset = 0;
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while(1) {
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ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
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BUG_ON(ret == 0);
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if (ret < 0)
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goto out;
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ret = 0;
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leaf = path->nodes[0];
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nritems = btrfs_header_nritems(leaf);
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if (path->slots[0] == nritems)
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goto out;
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btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
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if (found_key.objectid != extent_key->objectid)
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break;
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if (found_key.type != BTRFS_EXTENT_REF_KEY)
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break;
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key.offset = found_key.offset + 1;
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item_size = btrfs_item_size_nr(leaf, path->slots[0]);
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ref = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_extent_ref);
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ref_root = btrfs_ref_root(leaf, ref);
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ref_gen = btrfs_ref_generation(leaf, ref);
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ref_objectid = btrfs_ref_objectid(leaf, ref);
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ref_offset = btrfs_ref_offset(leaf, ref);
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btrfs_release_path(extent_root, path);
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ret = relocate_one_reference(extent_root, path,
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extent_key, ref_root, ref_gen,
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ref_objectid, ref_offset);
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if (ret)
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goto out;
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}
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ret = 0;
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out:
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btrfs_release_path(extent_root, path);
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return ret;
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}
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static int find_overlapping_extent(struct btrfs_root *root,
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struct btrfs_path *path, u64 new_size)
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{
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struct btrfs_key found_key;
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struct extent_buffer *leaf;
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int ret;
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while(1) {
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if (path->slots[0] == 0) {
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ret = btrfs_prev_leaf(root, path);
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if (ret == 1) {
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return 1;
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}
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if (ret < 0)
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return ret;
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} else {
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path->slots[0]--;
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}
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leaf = path->nodes[0];
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btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
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if (found_key.type == BTRFS_EXTENT_ITEM_KEY) {
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if (found_key.objectid + found_key.offset > new_size)
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return 0;
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else
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return 1;
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}
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}
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return 1;
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}
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int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *tree_root = root->fs_info->tree_root;
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struct btrfs_path *path;
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u64 cur_byte;
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u64 total_found;
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u64 ptr;
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struct btrfs_fs_info *info = root->fs_info;
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struct extent_map_tree *block_group_cache;
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struct btrfs_key key;
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struct btrfs_key found_key = { 0, 0, 0 };
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struct extent_buffer *leaf;
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u32 nritems;
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int ret;
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int slot;
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btrfs_set_super_total_bytes(&info->super_copy, new_size);
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block_group_cache = &info->block_group_cache;
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path = btrfs_alloc_path();
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root = root->fs_info->extent_root;
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again:
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total_found = 0;
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key.objectid = new_size;
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cur_byte = key.objectid;
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key.offset = 0;
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key.type = 0;
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while(1) {
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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goto out;
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next:
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leaf = path->nodes[0];
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if (key.objectid == new_size - 1) {
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ret = find_overlapping_extent(root, path, new_size);
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if (ret != 0) {
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btrfs_release_path(root, path);
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ret = btrfs_search_slot(NULL, root, &key,
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path, 0, 0);
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if (ret < 0)
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goto out;
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}
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}
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nritems = btrfs_header_nritems(leaf);
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ret = 0;
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slot = path->slots[0];
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if (slot < nritems)
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btrfs_item_key_to_cpu(leaf, &found_key, slot);
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if (slot == nritems ||
|
||||
btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY) {
|
||||
path->slots[0]++;
|
||||
if (path->slots[0] >= nritems) {
|
||||
ret = btrfs_next_leaf(root, path);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
if (ret == 1) {
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
goto next;
|
||||
}
|
||||
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
||||
if (found_key.objectid + found_key.offset <= cur_byte)
|
||||
continue;
|
||||
total_found++;
|
||||
cur_byte = found_key.objectid + found_key.offset;
|
||||
key.objectid = cur_byte;
|
||||
btrfs_release_path(root, path);
|
||||
ret = relocate_one_extent(root, path, &found_key);
|
||||
}
|
||||
|
||||
btrfs_release_path(root, path);
|
||||
|
||||
if (total_found > 0) {
|
||||
trans = btrfs_start_transaction(tree_root, 1);
|
||||
btrfs_commit_transaction(trans, tree_root);
|
||||
|
||||
mutex_unlock(&root->fs_info->fs_mutex);
|
||||
btrfs_clean_old_snapshots(tree_root);
|
||||
mutex_lock(&root->fs_info->fs_mutex);
|
||||
|
||||
trans = btrfs_start_transaction(tree_root, 1);
|
||||
btrfs_commit_transaction(trans, tree_root);
|
||||
goto again;
|
||||
}
|
||||
|
||||
trans = btrfs_start_transaction(root, 1);
|
||||
key.objectid = new_size;
|
||||
key.offset = 0;
|
||||
key.type = 0;
|
||||
while(1) {
|
||||
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
bg_next:
|
||||
leaf = path->nodes[0];
|
||||
nritems = btrfs_header_nritems(leaf);
|
||||
ret = 0;
|
||||
slot = path->slots[0];
|
||||
if (slot < nritems)
|
||||
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
||||
if (slot == nritems ||
|
||||
btrfs_key_type(&found_key) != BTRFS_BLOCK_GROUP_ITEM_KEY) {
|
||||
if (slot < nritems) {
|
||||
printk("shrinker found key %Lu %u %Lu\n",
|
||||
found_key.objectid, found_key.type,
|
||||
found_key.offset);
|
||||
path->slots[0]++;
|
||||
}
|
||||
if (path->slots[0] >= nritems) {
|
||||
ret = btrfs_next_leaf(root, path);
|
||||
if (ret < 0)
|
||||
break;
|
||||
if (ret == 1) {
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
goto bg_next;
|
||||
}
|
||||
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
||||
ret = get_state_private(&info->block_group_cache,
|
||||
found_key.objectid, &ptr);
|
||||
if (!ret)
|
||||
kfree((void *)(unsigned long)ptr);
|
||||
|
||||
clear_extent_bits(&info->block_group_cache, found_key.objectid,
|
||||
found_key.objectid + found_key.offset - 1,
|
||||
(unsigned int)-1, GFP_NOFS);
|
||||
|
||||
key.objectid = found_key.objectid + 1;
|
||||
btrfs_del_item(trans, root, path);
|
||||
btrfs_release_path(root, path);
|
||||
}
|
||||
clear_extent_dirty(&info->free_space_cache, new_size, (u64)-1,
|
||||
GFP_NOFS);
|
||||
btrfs_commit_transaction(trans, root);
|
||||
out:
|
||||
btrfs_free_path(path);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_root *root, u64 new_size)
|
||||
{
|
||||
struct btrfs_path *path;
|
||||
u64 nr = 0;
|
||||
u64 cur_byte;
|
||||
u64 old_size;
|
||||
struct btrfs_block_group_cache *cache;
|
||||
struct btrfs_block_group_item *item;
|
||||
struct btrfs_fs_info *info = root->fs_info;
|
||||
struct extent_map_tree *block_group_cache;
|
||||
struct btrfs_key key;
|
||||
struct extent_buffer *leaf;
|
||||
int ret;
|
||||
int bit;
|
||||
|
||||
old_size = btrfs_super_total_bytes(&info->super_copy);
|
||||
block_group_cache = &info->block_group_cache;
|
||||
|
||||
root = info->extent_root;
|
||||
|
||||
cache = btrfs_lookup_block_group(root->fs_info, old_size - 1);
|
||||
|
||||
cur_byte = cache->key.objectid + cache->key.offset;
|
||||
if (cur_byte >= new_size)
|
||||
goto set_size;
|
||||
|
||||
key.offset = BTRFS_BLOCK_GROUP_SIZE;
|
||||
btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
|
||||
|
||||
path = btrfs_alloc_path();
|
||||
if (!path)
|
||||
return -ENOMEM;
|
||||
|
||||
while(cur_byte < new_size) {
|
||||
key.objectid = cur_byte;
|
||||
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
||||
sizeof(struct btrfs_block_group_item));
|
||||
BUG_ON(ret);
|
||||
leaf = path->nodes[0];
|
||||
item = btrfs_item_ptr(leaf, path->slots[0],
|
||||
struct btrfs_block_group_item);
|
||||
|
||||
btrfs_set_disk_block_group_used(leaf, item, 0);
|
||||
if (nr % 3) {
|
||||
btrfs_set_disk_block_group_flags(leaf, item,
|
||||
BTRFS_BLOCK_GROUP_DATA);
|
||||
} else {
|
||||
btrfs_set_disk_block_group_flags(leaf, item, 0);
|
||||
}
|
||||
nr++;
|
||||
|
||||
cache = kmalloc(sizeof(*cache), GFP_NOFS);
|
||||
BUG_ON(!cache);
|
||||
|
||||
read_extent_buffer(leaf, &cache->item, (unsigned long)item,
|
||||
sizeof(cache->item));
|
||||
|
||||
memcpy(&cache->key, &key, sizeof(key));
|
||||
cache->cached = 0;
|
||||
cache->pinned = 0;
|
||||
cur_byte = key.objectid + key.offset;
|
||||
btrfs_release_path(root, path);
|
||||
|
||||
if (cache->item.flags & BTRFS_BLOCK_GROUP_DATA) {
|
||||
bit = BLOCK_GROUP_DATA;
|
||||
cache->data = BTRFS_BLOCK_GROUP_DATA;
|
||||
} else {
|
||||
bit = BLOCK_GROUP_METADATA;
|
||||
cache->data = 0;
|
||||
}
|
||||
|
||||
/* use EXTENT_LOCKED to prevent merging */
|
||||
set_extent_bits(block_group_cache, key.objectid,
|
||||
key.objectid + key.offset - 1,
|
||||
bit | EXTENT_LOCKED, GFP_NOFS);
|
||||
set_state_private(block_group_cache, key.objectid,
|
||||
(unsigned long)cache);
|
||||
}
|
||||
btrfs_free_path(path);
|
||||
set_size:
|
||||
btrfs_set_super_total_bytes(&info->super_copy, new_size);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int btrfs_read_block_groups(struct btrfs_root *root)
|
||||
{
|
||||
struct btrfs_path *path;
|
||||
|
|
|
|||
105
fs/btrfs/inode.c
105
fs/btrfs/inode.c
|
|
@ -2346,7 +2346,7 @@ static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static unsigned long force_ra(struct address_space *mapping,
|
||||
unsigned long btrfs_force_ra(struct address_space *mapping,
|
||||
struct file_ra_state *ra, struct file *file,
|
||||
pgoff_t offset, pgoff_t last_index)
|
||||
{
|
||||
|
|
@ -2372,6 +2372,8 @@ int btrfs_defrag_file(struct file *file) {
|
|||
unsigned long ra_index = 0;
|
||||
u64 page_start;
|
||||
u64 page_end;
|
||||
u64 delalloc_start;
|
||||
u64 existing_delalloc;
|
||||
unsigned long i;
|
||||
int ret;
|
||||
|
||||
|
|
@ -2385,8 +2387,9 @@ int btrfs_defrag_file(struct file *file) {
|
|||
last_index = inode->i_size >> PAGE_CACHE_SHIFT;
|
||||
for (i = 0; i <= last_index; i++) {
|
||||
if (i == ra_index) {
|
||||
ra_index = force_ra(inode->i_mapping, &file->f_ra,
|
||||
file, ra_index, last_index);
|
||||
ra_index = btrfs_force_ra(inode->i_mapping,
|
||||
&file->f_ra,
|
||||
file, ra_index, last_index);
|
||||
}
|
||||
page = grab_cache_page(inode->i_mapping, i);
|
||||
if (!page)
|
||||
|
|
@ -2404,8 +2407,19 @@ int btrfs_defrag_file(struct file *file) {
|
|||
page_end = page_start + PAGE_CACHE_SIZE - 1;
|
||||
|
||||
lock_extent(em_tree, page_start, page_end, GFP_NOFS);
|
||||
delalloc_start = page_start;
|
||||
existing_delalloc =
|
||||
count_range_bits(&BTRFS_I(inode)->extent_tree,
|
||||
&delalloc_start, page_end,
|
||||
PAGE_CACHE_SIZE, EXTENT_DELALLOC);
|
||||
set_extent_delalloc(em_tree, page_start,
|
||||
page_end, GFP_NOFS);
|
||||
|
||||
spin_lock(&root->fs_info->delalloc_lock);
|
||||
root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE -
|
||||
existing_delalloc;
|
||||
spin_unlock(&root->fs_info->delalloc_lock);
|
||||
|
||||
unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
|
||||
set_page_dirty(page);
|
||||
unlock_page(page);
|
||||
|
|
@ -2418,6 +2432,89 @@ int btrfs_defrag_file(struct file *file) {
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
|
||||
{
|
||||
u64 new_size;
|
||||
u64 old_size;
|
||||
struct btrfs_ioctl_vol_args *vol_args;
|
||||
struct btrfs_trans_handle *trans;
|
||||
char *sizestr;
|
||||
int ret = 0;
|
||||
int namelen;
|
||||
int mod = 0;
|
||||
|
||||
vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
|
||||
|
||||
if (!vol_args)
|
||||
return -ENOMEM;
|
||||
|
||||
if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
|
||||
ret = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
namelen = strlen(vol_args->name);
|
||||
if (namelen > BTRFS_VOL_NAME_MAX) {
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
sizestr = vol_args->name;
|
||||
if (!strcmp(sizestr, "max"))
|
||||
new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
|
||||
else {
|
||||
if (sizestr[0] == '-') {
|
||||
mod = -1;
|
||||
sizestr++;
|
||||
} else if (sizestr[0] == '+') {
|
||||
mod = 1;
|
||||
sizestr++;
|
||||
}
|
||||
new_size = btrfs_parse_size(sizestr);
|
||||
if (new_size == 0) {
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
mutex_lock(&root->fs_info->fs_mutex);
|
||||
old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
|
||||
|
||||
if (mod < 0) {
|
||||
if (new_size > old_size) {
|
||||
ret = -EINVAL;
|
||||
goto out_unlock;
|
||||
}
|
||||
new_size = old_size - new_size;
|
||||
} else if (mod > 0) {
|
||||
new_size = old_size + new_size;
|
||||
}
|
||||
|
||||
if (new_size < 256 * 1024 * 1024) {
|
||||
ret = -EINVAL;
|
||||
goto out_unlock;
|
||||
}
|
||||
if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
|
||||
ret = -EFBIG;
|
||||
goto out_unlock;
|
||||
}
|
||||
new_size = (new_size / root->sectorsize) * root->sectorsize;
|
||||
|
||||
printk("new size is %Lu\n", new_size);
|
||||
if (new_size > old_size) {
|
||||
trans = btrfs_start_transaction(root, 1);
|
||||
ret = btrfs_grow_extent_tree(trans, root, new_size);
|
||||
btrfs_commit_transaction(trans, root);
|
||||
} else {
|
||||
ret = btrfs_shrink_extent_tree(root, new_size);
|
||||
}
|
||||
|
||||
out_unlock:
|
||||
mutex_unlock(&root->fs_info->fs_mutex);
|
||||
out:
|
||||
kfree(vol_args);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
|
||||
{
|
||||
struct btrfs_ioctl_vol_args *vol_args;
|
||||
|
|
@ -2510,6 +2607,8 @@ long btrfs_ioctl(struct file *file, unsigned int
|
|||
return btrfs_ioctl_snap_create(root, (void __user *)arg);
|
||||
case BTRFS_IOC_DEFRAG:
|
||||
return btrfs_ioctl_defrag(file);
|
||||
case BTRFS_IOC_RESIZE:
|
||||
return btrfs_ioctl_resize(root, (void __user *)arg);
|
||||
}
|
||||
|
||||
return -ENOTTY;
|
||||
|
|
|
|||
|
|
@ -30,4 +30,6 @@ struct btrfs_ioctl_vol_args {
|
|||
struct btrfs_ioctl_vol_args)
|
||||
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
|
||||
struct btrfs_ioctl_vol_args)
|
||||
#define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
|
||||
struct btrfs_ioctl_vol_args)
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -179,6 +179,11 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|||
ret = btrfs_search_slot(trans, root, key, path, -1, 1);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
if (ret) {
|
||||
btrfs_print_leaf(root, path->nodes[0]);
|
||||
printk("failed to del %Lu %u %Lu\n", key->objectid, key->type, key->offset);
|
||||
|
||||
}
|
||||
BUG_ON(ret != 0);
|
||||
leaf = path->nodes[0];
|
||||
ri = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_item);
|
||||
|
|
|
|||
|
|
@ -74,9 +74,9 @@ static match_table_t tokens = {
|
|||
{Opt_err, NULL}
|
||||
};
|
||||
|
||||
static unsigned long parse_size(char *str)
|
||||
u64 btrfs_parse_size(char *str)
|
||||
{
|
||||
unsigned long res;
|
||||
u64 res;
|
||||
int mult = 1;
|
||||
char *end;
|
||||
char last;
|
||||
|
|
@ -150,7 +150,8 @@ static int parse_options (char * options,
|
|||
if (info) {
|
||||
char *num = match_strdup(&args[0]);
|
||||
if (num) {
|
||||
info->max_extent = parse_size(num);
|
||||
info->max_extent =
|
||||
btrfs_parse_size(num);
|
||||
kfree(num);
|
||||
|
||||
info->max_extent = max_t(u64,
|
||||
|
|
|
|||
Loading…
Reference in New Issue