+int ext4_mark_inode_used(struct super_block *sb, int ino)
+{
+ unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
+ struct buffer_head *inode_bitmap_bh = NULL, *group_desc_bh = NULL;
+ struct ext4_group_desc *gdp;
+ ext4_group_t group;
+ int bit;
+ int err = -EFSCORRUPTED;
+
+ if (ino < EXT4_FIRST_INO(sb) || ino > max_ino)
+ goto out;
+
+ group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
+ bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
+ inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
+ if (IS_ERR(inode_bitmap_bh))
+ return PTR_ERR(inode_bitmap_bh);
+
+ if (ext4_test_bit(bit, inode_bitmap_bh->b_data)) {
+ err = 0;
+ goto out;
+ }
+
+ gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
+ if (!gdp || !group_desc_bh) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ ext4_set_bit(bit, inode_bitmap_bh->b_data);
+
+ BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
+ err = ext4_handle_dirty_metadata(NULL, NULL, inode_bitmap_bh);
+ if (err) {
+ ext4_std_error(sb, err);
+ goto out;
+ }
+ err = sync_dirty_buffer(inode_bitmap_bh);
+ if (err) {
+ ext4_std_error(sb, err);
+ goto out;
+ }
+
+ /* We may have to initialize the block bitmap if it isn't already */
+ if (ext4_has_group_desc_csum(sb) &&
+ gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
+ struct buffer_head *block_bitmap_bh;
+
+ block_bitmap_bh = ext4_read_block_bitmap(sb, group);
+ if (IS_ERR(block_bitmap_bh)) {
+ err = PTR_ERR(block_bitmap_bh);
+ goto out;
+ }
+
+ BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap");
+ err = ext4_handle_dirty_metadata(NULL, NULL, block_bitmap_bh);
+ sync_dirty_buffer(block_bitmap_bh);
+
+ /* recheck and clear flag under lock if we still need to */
+ ext4_lock_group(sb, group);
+ if (ext4_has_group_desc_csum(sb) &&
+ (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
+ gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
+ ext4_free_group_clusters_set(sb, gdp,
+ ext4_free_clusters_after_init(sb, group, gdp));
+ ext4_block_bitmap_csum_set(sb, group, gdp,
+ block_bitmap_bh);
+ ext4_group_desc_csum_set(sb, group, gdp);
+ }
+ ext4_unlock_group(sb, group);
+ brelse(block_bitmap_bh);
+
+ if (err) {
+ ext4_std_error(sb, err);
+ goto out;
+ }
+ }
+
+ /* Update the relevant bg descriptor fields */
+ if (ext4_has_group_desc_csum(sb)) {
+ int free;
+
+ ext4_lock_group(sb, group); /* while we modify the bg desc */
+ free = EXT4_INODES_PER_GROUP(sb) -
+ ext4_itable_unused_count(sb, gdp);
+ if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
+ gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
+ free = 0;
+ }
+
+ /*
+ * Check the relative inode number against the last used
+ * relative inode number in this group. if it is greater
+ * we need to update the bg_itable_unused count
+ */
+ if (bit >= free)
+ ext4_itable_unused_set(sb, gdp,
+ (EXT4_INODES_PER_GROUP(sb) - bit - 1));
+ } else {
+ ext4_lock_group(sb, group);
+ }
+
+ ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
+ if (ext4_has_group_desc_csum(sb)) {
+ ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh,
+ EXT4_INODES_PER_GROUP(sb) / 8);
+ ext4_group_desc_csum_set(sb, group, gdp);
+ }
+
+ ext4_unlock_group(sb, group);
+ err = ext4_handle_dirty_metadata(NULL, NULL, group_desc_bh);
+ sync_dirty_buffer(group_desc_bh);
+out:
+ return err;
+}
+
+static int ext4_xattr_credits_for_new_inode(struct inode *dir, mode_t mode,
+ bool encrypt)
+{
+ struct super_block *sb = dir->i_sb;
+ int nblocks = 0;
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
+ struct posix_acl *p = get_acl(dir, ACL_TYPE_DEFAULT);
+
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+ if (p) {
+ int acl_size = p->a_count * sizeof(ext4_acl_entry);
+
+ nblocks += (S_ISDIR(mode) ? 2 : 1) *
+ __ext4_xattr_set_credits(sb, NULL /* inode */,
+ NULL /* block_bh */, acl_size,
+ true /* is_create */);
+ posix_acl_release(p);
+ }
+#endif
+
+#ifdef CONFIG_SECURITY
+ {
+ int num_security_xattrs = 1;
+
+#ifdef CONFIG_INTEGRITY
+ num_security_xattrs++;
+#endif
+ /*
+ * We assume that security xattrs are never more than 1k.
+ * In practice they are under 128 bytes.
+ */
+ nblocks += num_security_xattrs *
+ __ext4_xattr_set_credits(sb, NULL /* inode */,
+ NULL /* block_bh */, 1024,
+ true /* is_create */);
+ }
+#endif
+ if (encrypt)
+ nblocks += __ext4_xattr_set_credits(sb,
+ NULL /* inode */,
+ NULL /* block_bh */,
+ FSCRYPT_SET_CONTEXT_MAX_SIZE,
+ true /* is_create */);
+ return nblocks;
+}
+