Btrfs: Support for online FS resize (grow and shrink)
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
105
fs/btrfs/inode.c
105
fs/btrfs/inode.c
@ -2346,7 +2346,7 @@ fail_unlock:
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return ret;
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}
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static unsigned long force_ra(struct address_space *mapping,
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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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{
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@ -2372,6 +2372,8 @@ int btrfs_defrag_file(struct file *file) {
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unsigned long ra_index = 0;
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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 i;
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int ret;
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@ -2385,8 +2387,9 @@ int btrfs_defrag_file(struct file *file) {
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last_index = inode->i_size >> PAGE_CACHE_SHIFT;
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for (i = 0; i <= last_index; i++) {
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if (i == ra_index) {
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ra_index = force_ra(inode->i_mapping, &file->f_ra,
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file, ra_index, last_index);
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ra_index = btrfs_force_ra(inode->i_mapping,
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&file->f_ra,
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file, ra_index, last_index);
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}
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page = grab_cache_page(inode->i_mapping, i);
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if (!page)
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@ -2404,8 +2407,19 @@ int btrfs_defrag_file(struct file *file) {
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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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@ -2418,6 +2432,89 @@ out_unlock:
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return 0;
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}
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static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
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{
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u64 new_size;
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u64 old_size;
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struct btrfs_ioctl_vol_args *vol_args;
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struct btrfs_trans_handle *trans;
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char *sizestr;
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int ret = 0;
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int namelen;
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int mod = 0;
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vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
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if (!vol_args)
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return -ENOMEM;
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if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
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ret = -EFAULT;
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goto out;
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}
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namelen = strlen(vol_args->name);
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if (namelen > BTRFS_VOL_NAME_MAX) {
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ret = -EINVAL;
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goto out;
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}
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sizestr = vol_args->name;
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if (!strcmp(sizestr, "max"))
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new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
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else {
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if (sizestr[0] == '-') {
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mod = -1;
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sizestr++;
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} else if (sizestr[0] == '+') {
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mod = 1;
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sizestr++;
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}
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new_size = btrfs_parse_size(sizestr);
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if (new_size == 0) {
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ret = -EINVAL;
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goto out;
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}
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}
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mutex_lock(&root->fs_info->fs_mutex);
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old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
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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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}
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new_size = old_size - new_size;
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} else if (mod > 0) {
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new_size = old_size + new_size;
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}
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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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}
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if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
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ret = -EFBIG;
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goto out_unlock;
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}
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new_size = (new_size / root->sectorsize) * root->sectorsize;
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printk("new size is %Lu\n", new_size);
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if (new_size > old_size) {
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trans = btrfs_start_transaction(root, 1);
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ret = btrfs_grow_extent_tree(trans, root, new_size);
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btrfs_commit_transaction(trans, root);
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} else {
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ret = btrfs_shrink_extent_tree(root, new_size);
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}
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out_unlock:
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mutex_unlock(&root->fs_info->fs_mutex);
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out:
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kfree(vol_args);
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return ret;
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}
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static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
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{
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struct btrfs_ioctl_vol_args *vol_args;
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@ -2510,6 +2607,8 @@ long btrfs_ioctl(struct file *file, unsigned int
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return btrfs_ioctl_snap_create(root, (void __user *)arg);
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case BTRFS_IOC_DEFRAG:
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return btrfs_ioctl_defrag(file);
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case BTRFS_IOC_RESIZE:
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return btrfs_ioctl_resize(root, (void __user *)arg);
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}
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return -ENOTTY;
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