示例#1
0
static int ext4_update_inline_dir(handle_t *handle, struct dentry *dentry,
				  struct inode *dir,
				  struct ext4_iloc *iloc)
{
	int ret, reclen = EXT4_DIR_REC_LEN(dentry->d_name.len);
	int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;

	ret = ext4_update_inline_data(handle, dir,
				EXT4_I(dir)->i_inline_size + reclen);
	if (ret)
		return ret;

	ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
			     EXT4_I(dir)->i_inline_size -
						EXT4_MIN_INLINE_DATA_SIZE);
	dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
	return 0;
}
/*
 * Add a new entry into a inline dir.
 * It will return -ENOSPC if no space is available, and -EIO
 * and -EEXIST if directory entry already exists.
 */
static int ext4_add_dirent_to_inline(handle_t *handle,
				     struct dentry *dentry,
				     struct inode *inode,
				     struct ext4_iloc *iloc,
				     void *inline_start, int inline_size)
{
	struct inode	*dir = dentry->d_parent->d_inode;
	const char	*name = dentry->d_name.name;
	int		namelen = dentry->d_name.len;
	unsigned short	reclen;
	int		err;
	struct ext4_dir_entry_2 *de;

	reclen = EXT4_DIR_REC_LEN(namelen);
	err = ext4_find_dest_de(dir, inode, iloc->bh,
				inline_start, inline_size,
				name, namelen, &de);
	if (err)
		return err;

	err = ext4_journal_get_write_access(handle, iloc->bh);
	if (err)
		return err;
	ext4_insert_dentry(inode, de, inline_size, name, namelen);

	ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);

	/*
	 * XXX shouldn't update any times until successful
	 * completion of syscall, but too many callers depend
	 * on this.
	 *
	 * XXX similarly, too many callers depend on
	 * ext4_new_inode() setting the times, but error
	 * recovery deletes the inode, so the worst that can
	 * happen is that the times are slightly out of date
	 * and/or different from the directory change time.
	 */
	dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
	ext4_update_dx_flag(dir);
	dir->i_version++;
	ext4_mark_inode_dirty(handle, dir);
	return 1;
}
示例#3
0
static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
				  struct ext4_iloc *iloc)
{
	int ret;
	int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
	int new_size = get_max_inline_xattr_value_size(dir, iloc);

	if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
		return -ENOSPC;

	ret = ext4_update_inline_data(handle, dir,
				      new_size + EXT4_MIN_INLINE_DATA_SIZE);
	if (ret)
		return ret;

	ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
			     EXT4_I(dir)->i_inline_size -
						EXT4_MIN_INLINE_DATA_SIZE);
	dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
	return 0;
}
示例#4
0
/*
 * So this function is called when the volume is mkfsed with
 * dir_index disabled. In order to keep f_pos persistent
 * after we convert from an inlined dir to a blocked based,
 * we just pretend that we are a normal dir and return the
 * offset as if '.' and '..' really take place.
 *
 */
int ext4_read_inline_dir(struct file *file,
			 struct dir_context *ctx,
			 int *has_inline_data)
{
	unsigned int offset, parent_ino;
	int i;
	struct ext4_dir_entry_2 *de;
	struct super_block *sb;
	struct inode *inode = file_inode(file);
	int ret, inline_size = 0;
	struct ext4_iloc iloc;
	void *dir_buf = NULL;
	int dotdot_offset, dotdot_size, extra_offset, extra_size;

	ret = ext4_get_inode_loc(inode, &iloc);
	if (ret)
		return ret;

	down_read(&EXT4_I(inode)->xattr_sem);
	if (!ext4_has_inline_data(inode)) {
		up_read(&EXT4_I(inode)->xattr_sem);
		*has_inline_data = 0;
		goto out;
	}

	inline_size = ext4_get_inline_size(inode);
	dir_buf = kmalloc(inline_size, GFP_NOFS);
	if (!dir_buf) {
		ret = -ENOMEM;
		up_read(&EXT4_I(inode)->xattr_sem);
		goto out;
	}

	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
	up_read(&EXT4_I(inode)->xattr_sem);
	if (ret < 0)
		goto out;

	ret = 0;
	sb = inode->i_sb;
	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
	offset = ctx->pos;

	/*
	 * dotdot_offset and dotdot_size is the real offset and
	 * size for ".." and "." if the dir is block based while
	 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
	 * So we will use extra_offset and extra_size to indicate them
	 * during the inline dir iteration.
	 */
	dotdot_offset = EXT4_DIR_REC_LEN(1);
	dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
	extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
	extra_size = extra_offset + inline_size;

	/*
	 * If the version has changed since the last call to
	 * readdir(2), then we might be pointing to an invalid
	 * dirent right now.  Scan from the start of the inline
	 * dir to make sure.
	 */
	if (file->f_version != inode->i_version) {
		for (i = 0; i < extra_size && i < offset;) {
			/*
			 * "." is with offset 0 and
			 * ".." is dotdot_offset.
			 */
			if (!i) {
				i = dotdot_offset;
				continue;
			} else if (i == dotdot_offset) {
				i = dotdot_size;
				continue;
			}
			/* for other entry, the real offset in
			 * the buf has to be tuned accordingly.
			 */
			de = (struct ext4_dir_entry_2 *)
				(dir_buf + i - extra_offset);
			/* It's too expensive to do a full
			 * dirent test each time round this
			 * loop, but we do have to test at
			 * least that it is non-zero.  A
			 * failure will be detected in the
			 * dirent test below. */
			if (ext4_rec_len_from_disk(de->rec_len, extra_size)
				< EXT4_DIR_REC_LEN(1))
				break;
			i += ext4_rec_len_from_disk(de->rec_len,
						    extra_size);
		}
		offset = i;
		ctx->pos = offset;
		file->f_version = inode->i_version;
	}

	while (ctx->pos < extra_size) {
		if (ctx->pos == 0) {
			if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
				goto out;
			ctx->pos = dotdot_offset;
			continue;
		}

		if (ctx->pos == dotdot_offset) {
			if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
				goto out;
			ctx->pos = dotdot_size;
			continue;
		}

		de = (struct ext4_dir_entry_2 *)
			(dir_buf + ctx->pos - extra_offset);
		if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
					 extra_size, ctx->pos))
			goto out;
		if (le32_to_cpu(de->inode)) {
			if (!dir_emit(ctx, de->name, de->name_len,
				      le32_to_cpu(de->inode),
				      get_dtype(sb, de->file_type)))
				goto out;
		}
		ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
	}
out:
	kfree(dir_buf);
	brelse(iloc.bh);
	return ret;
}
示例#5
0
/*
 * This function fills a red-black tree with information from an
 * inlined dir.  It returns the number directory entries loaded
 * into the tree.  If there is an error it is returned in err.
 */
int htree_inlinedir_to_tree(struct file *dir_file,
			    struct inode *dir, ext4_lblk_t block,
			    struct dx_hash_info *hinfo,
			    __u32 start_hash, __u32 start_minor_hash,
			    int *has_inline_data)
{
	int err = 0, count = 0;
	unsigned int parent_ino;
	int pos;
	struct ext4_dir_entry_2 *de;
	struct inode *inode = file_inode(dir_file);
	int ret, inline_size = 0;
	struct ext4_iloc iloc;
	void *dir_buf = NULL;
	struct ext4_dir_entry_2 fake;
	struct ext4_str tmp_str;

	ret = ext4_get_inode_loc(inode, &iloc);
	if (ret)
		return ret;

	down_read(&EXT4_I(inode)->xattr_sem);
	if (!ext4_has_inline_data(inode)) {
		up_read(&EXT4_I(inode)->xattr_sem);
		*has_inline_data = 0;
		goto out;
	}

	inline_size = ext4_get_inline_size(inode);
	dir_buf = kmalloc(inline_size, GFP_NOFS);
	if (!dir_buf) {
		ret = -ENOMEM;
		up_read(&EXT4_I(inode)->xattr_sem);
		goto out;
	}

	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
	up_read(&EXT4_I(inode)->xattr_sem);
	if (ret < 0)
		goto out;

	pos = 0;
	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
	while (pos < inline_size) {
		/*
		 * As inlined dir doesn't store any information about '.' and
		 * only the inode number of '..' is stored, we have to handle
		 * them differently.
		 */
		if (pos == 0) {
			fake.inode = cpu_to_le32(inode->i_ino);
			fake.name_len = 1;
			strcpy(fake.name, ".");
			fake.rec_len = ext4_rec_len_to_disk(
						EXT4_DIR_REC_LEN(fake.name_len),
						inline_size);
			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
			de = &fake;
			pos = EXT4_INLINE_DOTDOT_OFFSET;
		} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
			fake.inode = cpu_to_le32(parent_ino);
			fake.name_len = 2;
			strcpy(fake.name, "..");
			fake.rec_len = ext4_rec_len_to_disk(
						EXT4_DIR_REC_LEN(fake.name_len),
						inline_size);
			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
			de = &fake;
			pos = EXT4_INLINE_DOTDOT_SIZE;
		} else {
			de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
			pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
			if (ext4_check_dir_entry(inode, dir_file, de,
					 iloc.bh, dir_buf,
					 inline_size, pos)) {
				ret = count;
				goto out;
			}
		}

		ext4fs_dirhash(de->name, de->name_len, hinfo);
		if ((hinfo->hash < start_hash) ||
		    ((hinfo->hash == start_hash) &&
		     (hinfo->minor_hash < start_minor_hash)))
			continue;
		if (de->inode == 0)
			continue;
		tmp_str.name = de->name;
		tmp_str.len = de->name_len;
		err = ext4_htree_store_dirent(dir_file, hinfo->hash,
					      hinfo->minor_hash, de, &tmp_str);
		if (err) {
			count = err;
			goto out;
		}
		count++;
	}
	ret = count;
out:
	kfree(dir_buf);
	brelse(iloc.bh);
	return ret;
}
示例#6
0
int ext4_read_inline_dir(struct file *filp,
			 void *dirent, filldir_t filldir,
			 int *has_inline_data)
{
	int error = 0;
	unsigned int offset, parent_ino;
	int i, stored;
	struct ext4_dir_entry_2 *de;
	struct super_block *sb;
	struct inode *inode = filp->f_path.dentry->d_inode;
	int ret, inline_size = 0;
	struct ext4_iloc iloc;
	void *dir_buf = NULL;

	ret = ext4_get_inode_loc(inode, &iloc);
	if (ret)
		return ret;

	down_read(&EXT4_I(inode)->xattr_sem);
	if (!ext4_has_inline_data(inode)) {
		up_read(&EXT4_I(inode)->xattr_sem);
		*has_inline_data = 0;
		goto out;
	}

	inline_size = ext4_get_inline_size(inode);
	dir_buf = kmalloc(inline_size, GFP_NOFS);
	if (!dir_buf) {
		ret = -ENOMEM;
		up_read(&EXT4_I(inode)->xattr_sem);
		goto out;
	}

	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
	up_read(&EXT4_I(inode)->xattr_sem);
	if (ret < 0)
		goto out;

	sb = inode->i_sb;
	stored = 0;
	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);

	while (!error && !stored && filp->f_pos < inode->i_size) {
revalidate:
		/*
		 * If the version has changed since the last call to
		 * readdir(2), then we might be pointing to an invalid
		 * dirent right now.  Scan from the start of the inline
		 * dir to make sure.
		 */
		if (filp->f_version != inode->i_version) {
			for (i = 0;
			     i < inode->i_size && i < offset;) {
				if (!i) {
					/* skip "." and ".." if needed. */
					i += EXT4_INLINE_DOTDOT_SIZE;
					continue;
				}
				de = (struct ext4_dir_entry_2 *)
					(dir_buf + i);
				/* It's too expensive to do a full
				 * dirent test each time round this
				 * loop, but we do have to test at
				 * least that it is non-zero.  A
				 * failure will be detected in the
				 * dirent test below. */
				if (ext4_rec_len_from_disk(de->rec_len,
					inline_size) < EXT4_DIR_REC_LEN(1))
					break;
				i += ext4_rec_len_from_disk(de->rec_len,
							    inline_size);
			}
			offset = i;
			filp->f_pos = offset;
			filp->f_version = inode->i_version;
		}

		while (!error && filp->f_pos < inode->i_size) {
			if (filp->f_pos == 0) {
				error = filldir(dirent, ".", 1, 0, inode->i_ino,
						DT_DIR);
				if (error)
					break;
				stored++;

				error = filldir(dirent, "..", 2, 0, parent_ino,
						DT_DIR);
				if (error)
					break;
				stored++;

				filp->f_pos = offset = EXT4_INLINE_DOTDOT_SIZE;
				continue;
			}

			de = (struct ext4_dir_entry_2 *)(dir_buf + offset);
			if (ext4_check_dir_entry(inode, filp, de,
						 iloc.bh, dir_buf,
						 inline_size, offset)) {
				ret = stored;
				goto out;
			}
			offset += ext4_rec_len_from_disk(de->rec_len,
							 inline_size);
			if (le32_to_cpu(de->inode)) {
				/* We might block in the next section
				 * if the data destination is
				 * currently swapped out.  So, use a
				 * version stamp to detect whether or
				 * not the directory has been modified
				 * during the copy operation.
				 */
				u64 version = filp->f_version;

				error = filldir(dirent, de->name,
						de->name_len,
						filp->f_pos,
						le32_to_cpu(de->inode),
						get_dtype(sb, de->file_type));
				if (error)
					break;
				if (version != filp->f_version)
					goto revalidate;
				stored++;
			}
			filp->f_pos += ext4_rec_len_from_disk(de->rec_len,
							      inline_size);
		}
		offset = 0;
	}
out:
	kfree(dir_buf);
	brelse(iloc.bh);
	return ret;
}
示例#7
0
int ext4_read_inline_dir(struct file *filp,
			 void *dirent, filldir_t filldir)
{
	int error = 0;
	unsigned int offset;
	int i, stored;
	void *inline_pos;
	struct ext4_dir_entry_2 *de;
	struct super_block *sb;
	struct inode *inode = filp->f_path.dentry->d_inode;
	int ret, inline_size = 0;
	struct ext4_iloc iloc;

	ret = ext4_get_inode_loc(inode, &iloc);
	if (ret)
		return ret;

	down_read(&EXT4_I(inode)->xattr_sem);
	if (!ext4_has_inline_data(inode))
		goto out;

	sb = inode->i_sb;
	stored = 0;
	offset = filp->f_pos & (sb->s_blocksize - 1);

	while (!error && !stored && filp->f_pos < inode->i_size) {
revalidate:
		/* If the version has changed since the last call to
		 * readdir(2), then we might be pointing to an invalid
		 * dirent right now.  Scan from the start of the block
		 * to make sure. */
		if (filp->f_version != inode->i_version) {
			for (i = 0; i < inode->i_size && i < offset; ) {
				de = ext4_get_inline_entry(inode, &iloc, i,
							   NULL, &inline_size);
				/* It's too expensive to do a full
				 * dirent test each time round this
				 * loop, but we do have to test at
				 * least that it is non-zero.  A
				 * failure will be detected in the
				 * dirent test below. */
				if (ext4_rec_len_from_disk(de->rec_len,
					inline_size) < EXT4_DIR_REC_LEN(1))
					break;
				i += ext4_rec_len_from_disk(de->rec_len,
							    inline_size);
			}
			offset = i;
			filp->f_pos = offset;
			filp->f_version = inode->i_version;
		}

		while (!error && filp->f_pos < inode->i_size) {
			de = ext4_get_inline_entry(inode, &iloc, offset,
						   &inline_pos, &inline_size);
			if (ext4_check_dir_entry(__func__, inode, de,
						 iloc.bh, inline_pos,
						 inline_size, offset)) {
				ret = stored;
				goto out;
			}
			offset += ext4_rec_len_from_disk(de->rec_len,
							 inline_size);
			if (le32_to_cpu(de->inode)) {
				/* We might block in the next section
				 * if the data destination is
				 * currently swapped out.  So, use a
				 * version stamp to detect whether or
				 * not the directory has been modified
				 * during the copy operation.
				 */
				u64 version = filp->f_version;

				error = filldir(dirent, de->name,
						de->name_len,
						filp->f_pos,
						le32_to_cpu(de->inode),
						get_dtype(sb, de->file_type));
				if (error)
					break;
				if (version != filp->f_version)
					goto revalidate;
				stored++;
			}
			filp->f_pos += ext4_rec_len_from_disk(de->rec_len,
							      inline_size);
		}
		offset = 0;
	}
out:
	up_read(&EXT4_I(inode)->xattr_sem);
	brelse(iloc.bh);
	return ret;
}