示例#1
0
/**
 * reiser4_delete_object_common - delete_object of file_plugin
 * @inode: inode to be deleted
 *
 * This is common implementation of delete_object method of file_plugin. It
 * applies to object its deletion consists of removing two items - stat data
 * and safe-link.
 */
int reiser4_delete_object_common(struct inode *inode)
{
	int result;

	assert("nikita-1477", inode != NULL);
	/* FIXME: if file body deletion failed (i/o error, for instance),
	   inode->i_size can be != 0 here */
	assert("nikita-3420", inode->i_size == 0 || S_ISLNK(inode->i_mode));
	assert("nikita-3421", inode->i_nlink == 0);

	if (!reiser4_inode_get_flag(inode, REISER4_NO_SD)) {
		reiser4_block_nr reserve;

		/* grab space which is needed to remove 2 items from the tree:
		   stat data and safe-link */
		reserve = 2 *
		  estimate_one_item_removal(reiser4_tree_by_inode(inode));
		if (reiser4_grab_space_force(reserve,
					     BA_RESERVED | BA_CAN_COMMIT))
			return RETERR(-ENOSPC);
		result = common_object_delete_no_reserve(inode);
	} else
		result = 0;
	return result;
}
示例#2
0
/* this is common implementation of create_object method of file plugin
 */
int reiser4_create_object_common(struct inode *object, struct inode *parent,
				 reiser4_object_create_data * data)
{
	reiser4_block_nr reserve;
	assert("nikita-744", object != NULL);
	assert("nikita-745", parent != NULL);
	assert("nikita-747", data != NULL);
	assert("nikita-748", reiser4_inode_get_flag(object, REISER4_NO_SD));

	reserve = estimate_create_common(object);
	if (reiser4_grab_space(reserve, BA_CAN_COMMIT))
		return RETERR(-ENOSPC);
	return write_sd_by_inode_common(object);
}
示例#3
0
/* this is common implementation of write_sd_by_inode method of file plugin
   either insert stat data or update it
 */
int write_sd_by_inode_common(struct inode *inode/* object to save */)
{
	int result;

	assert("nikita-730", inode != NULL);

	if (reiser4_inode_get_flag(inode, REISER4_NO_SD))
		/* object doesn't have stat-data yet */
		result = insert_new_sd(inode);
	else
		result = update_sd(inode);
	if (result != 0 && result != -ENAMETOOLONG && result != -ENOMEM)
		/* Don't issue warnings about "name is too long" */
		warning("nikita-2221", "Failed to save sd for %llu: %i",
			(unsigned long long)get_inode_oid(inode), result);
	return result;
}
示例#4
0
 * @info:  parameters of new object
 *
 * Inserts stat data with symlink extension where into the tree.
 */
int reiser4_create_symlink(struct inode *symlink,
			   struct inode *dir UNUSED_ARG,
			   reiser4_object_create_data *data /* info passed to us
							     * this is filled by
							     * reiser4() syscall
							     * in particular */)
{
	int result;

	assert("nikita-680", symlink != NULL);
	assert("nikita-681", S_ISLNK(symlink->i_mode));
	assert("nikita-685", reiser4_inode_get_flag(symlink, REISER4_NO_SD));
	assert("nikita-682", dir != NULL);
	assert("nikita-684", data != NULL);
	assert("nikita-686", data->id == SYMLINK_FILE_PLUGIN_ID);

	/*
	 * stat data of symlink has symlink extension in which we store
	 * symlink content, that is, path symlink is pointing to.
	 */
	reiser4_inode_data(symlink)->extmask |= (1 << SYMLINK_STAT);

	assert("vs-838", symlink->i_private == NULL);
	symlink->i_private = (void *)data->name;

	assert("vs-843", symlink->i_size == 0);
	INODE_SET_FIELD(symlink, i_size, strlen(data->name));
/* for every page of file: read page, cut part of extent pointing to this page,
   put data of page tree by tail item */
int extent2tail(struct file * file, struct unix_file_info *uf_info)
{
	int result;
	struct inode *inode;
	struct page *page;
	unsigned long num_pages, i;
	unsigned long start_page;
	reiser4_key from;
	reiser4_key to;
	unsigned count;
	__u64 offset;

	assert("nikita-3362", ea_obtained(uf_info));
	inode = unix_file_info_to_inode(uf_info);
	assert("nikita-3412", !IS_RDONLY(inode));
	assert("vs-1649", uf_info->container != UF_CONTAINER_TAILS);
	assert("", !reiser4_inode_get_flag(inode, REISER4_PART_IN_CONV));

	offset = 0;
	if (reiser4_inode_get_flag(inode, REISER4_PART_MIXED)) {
		/*
		 * file is marked on disk as there was a conversion which did
		 * not complete due to either crash or some error. Find which
		 * offset tail conversion stopped at
		 */
		result = find_start(inode, EXTENT_POINTER_ID, &offset);
		if (result == -ENOENT) {
			/* no extent found, everything is converted */
			uf_info->container = UF_CONTAINER_TAILS;
			complete_conversion(inode);
			return 0;
		} else if (result != 0)
			/* some other error */
			return result;
	}

	reiser4_inode_set_flag(inode, REISER4_PART_IN_CONV);

	/* number of pages in the file */
	num_pages =
	    (inode->i_size + - offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
	start_page = offset >> PAGE_CACHE_SHIFT;

	inode_file_plugin(inode)->key_by_inode(inode, offset, &from);
	to = from;

	result = 0;
	for (i = 0; i < num_pages; i++) {
		__u64 start_byte;

		result = reserve_extent2tail_iteration(inode);
		if (result != 0)
			break;
		if (i == 0 && offset == 0) {
			reiser4_inode_set_flag(inode, REISER4_PART_MIXED);
			reiser4_update_sd(inode);
		}

		page = read_mapping_page(inode->i_mapping,
					 (unsigned)(i + start_page), NULL);
		if (IS_ERR(page)) {
			result = PTR_ERR(page);
			break;
		}

		wait_on_page_locked(page);

		if (!PageUptodate(page)) {
			page_cache_release(page);
			result = RETERR(-EIO);
			break;
		}

		/* cut part of file we have read */
		start_byte = (__u64) ((i + start_page) << PAGE_CACHE_SHIFT);
		set_key_offset(&from, start_byte);
		set_key_offset(&to, start_byte + PAGE_CACHE_SIZE - 1);
		/*
		 * reiser4_cut_tree_object() returns -E_REPEAT to allow atom
		 * commits during over-long truncates. But
		 * extent->tail conversion should be performed in one
		 * transaction.
		 */
		result = reiser4_cut_tree(reiser4_tree_by_inode(inode), &from,
					  &to, inode, 0);

		if (result) {
			page_cache_release(page);
			break;
		}

		/* put page data into tree via tail_write */
		count = PAGE_CACHE_SIZE;
		if ((i == (num_pages - 1)) &&
		    (inode->i_size & ~PAGE_CACHE_MASK))
			/* last page can be incompleted */
			count = (inode->i_size & ~PAGE_CACHE_MASK);
		while (count) {
			loff_t pos = start_byte;

			assert("edward-1537",
			       file != NULL && file->f_dentry != NULL);
			assert("edward-1538",
			       file->f_dentry->d_inode == inode);

			result = reiser4_write_tail(file, inode,
						    (char __user *)kmap(page),
						    count, &pos);
			reiser4_free_file_fsdata(file);
			if (result <= 0) {
				warning("", "reiser4_write_tail failed");
				page_cache_release(page);
				reiser4_inode_clr_flag(inode, REISER4_PART_IN_CONV);
				return result;
			}
			count -= result;
		}

		/* release page */
		lock_page(page);
		/* page is already detached from jnode and mapping. */
		assert("vs-1086", page->mapping == NULL);
		assert("nikita-2690",
		       (!PagePrivate(page) && jprivate(page) == 0));
		/* waiting for writeback completion with page lock held is
		 * perfectly valid. */
		wait_on_page_writeback(page);
		reiser4_drop_page(page);
		/* release reference taken by read_cache_page() above */
		page_cache_release(page);

		drop_exclusive_access(uf_info);
		/*
		 * throttle the conversion.
		 * FIXME-EDWARD: Calculate and pass the precise number
		 * of pages that was dirtied
		 */
		reiser4_throttle_write(inode, 1);
		get_exclusive_access(uf_info);
		/*
		 * nobody is allowed to complete conversion but a process which
		 * started it
		 */
		assert("", reiser4_inode_get_flag(inode, REISER4_PART_MIXED));
	}

	reiser4_inode_clr_flag(inode, REISER4_PART_IN_CONV);

	if (i == num_pages) {
		/* file is converted to formatted items */
		assert("vs-1698", reiser4_inode_get_flag(inode,
							 REISER4_PART_MIXED));
		assert("vs-1260",
		       inode_has_no_jnodes(reiser4_inode_data(inode)));

		uf_info->container = UF_CONTAINER_TAILS;
		complete_conversion(inode);
		return 0;
	}
	/*
	 * conversion is not complete. Inode was already marked as
	 * REISER4_PART_MIXED and stat-data were updated at the first
	 * iteration of the loop above.
	 */
	warning("nikita-2282",
		"Partial conversion of %llu: %lu of %lu: %i",
		(unsigned long long)get_inode_oid(inode), i,
		num_pages, result);

	/* this flag should be cleared, otherwise get_exclusive_access_careful()
	   will fall into infinite loop */
	assert("edward-1550", !reiser4_inode_get_flag(inode,
						      REISER4_PART_IN_CONV));
	return result;
}
/**
 * tail2extent
 * @uf_info:
 *
 *
 */
int tail2extent(struct unix_file_info *uf_info)
{
	int result;
	reiser4_key key;	/* key of next byte to be moved to page */
	char *p_data;		/* data of page */
	unsigned page_off = 0,	/* offset within the page where to copy data */
	    count;		/* number of bytes of item which can be
				 * copied to page */
	struct page *pages[TAIL2EXTENT_PAGE_NUM];
	struct page *page;
	int done;		/* set to 1 when all file is read */
	char *item;
	int i;
	struct inode *inode;
	int first_iteration;
	int bytes;
	__u64 offset;

	assert("nikita-3362", ea_obtained(uf_info));
	inode = unix_file_info_to_inode(uf_info);
	assert("nikita-3412", !IS_RDONLY(inode));
	assert("vs-1649", uf_info->container != UF_CONTAINER_EXTENTS);
	assert("", !reiser4_inode_get_flag(inode, REISER4_PART_IN_CONV));

	offset = 0;
	first_iteration = 1;
	result = 0;
	if (reiser4_inode_get_flag(inode, REISER4_PART_MIXED)) {
		/*
		 * file is marked on disk as there was a conversion which did
		 * not complete due to either crash or some error. Find which
		 * offset tail conversion stopped at
		 */
		result = find_start(inode, FORMATTING_ID, &offset);
		if (result == -ENOENT) {
			/* no tail items found, everything is converted */
			uf_info->container = UF_CONTAINER_EXTENTS;
			complete_conversion(inode);
			return 0;
		} else if (result != 0)
			/* some other error */
			return result;
		first_iteration = 0;
	}

	reiser4_inode_set_flag(inode, REISER4_PART_IN_CONV);

	/* get key of first byte of a file */
	inode_file_plugin(inode)->key_by_inode(inode, offset, &key);

	done = 0;
	while (done == 0) {
		memset(pages, 0, sizeof(pages));
		result = reserve_tail2extent_iteration(inode);
		if (result != 0) {
			reiser4_inode_clr_flag(inode, REISER4_PART_IN_CONV);
			goto out;
		}
		if (first_iteration) {
			reiser4_inode_set_flag(inode, REISER4_PART_MIXED);
			reiser4_update_sd(inode);
			first_iteration = 0;
		}
		bytes = 0;
		for (i = 0; i < sizeof_array(pages) && done == 0; i++) {
			assert("vs-598",
			       (get_key_offset(&key) & ~PAGE_CACHE_MASK) == 0);
			page = alloc_page(reiser4_ctx_gfp_mask_get());
			if (!page) {
				result = RETERR(-ENOMEM);
				goto error;
			}

			page->index =
			    (unsigned long)(get_key_offset(&key) >>
					    PAGE_CACHE_SHIFT);
			/*
			 * usually when one is going to longterm lock znode (as
			 * find_file_item does, for instance) he must not hold
			 * locked pages. However, there is an exception for
			 * case tail2extent. Pages appearing here are not
			 * reachable to everyone else, they are clean, they do
			 * not have jnodes attached so keeping them locked do
			 * not risk deadlock appearance
			 */
			assert("vs-983", !PagePrivate(page));
			reiser4_invalidate_pages(inode->i_mapping, page->index,
						 1, 0);

			for (page_off = 0; page_off < PAGE_CACHE_SIZE;) {
				coord_t coord;
				lock_handle lh;

				/* get next item */
				/* FIXME: we might want to readahead here */
				init_lh(&lh);
				result =
				    find_file_item_nohint(&coord, &lh, &key,
							  ZNODE_READ_LOCK,
							  inode);
				if (result != CBK_COORD_FOUND) {
					/*
					 * error happened of not items of file
					 * were found
					 */
					done_lh(&lh);
					page_cache_release(page);
					goto error;
				}

				if (coord.between == AFTER_UNIT) {
					/*
					 * end of file is reached. Padd page
					 * with zeros
					 */
					done_lh(&lh);
					done = 1;
					p_data = kmap_atomic(page, KM_USER0);
					memset(p_data + page_off, 0,
					       PAGE_CACHE_SIZE - page_off);
					kunmap_atomic(p_data, KM_USER0);
					break;
				}

				result = zload(coord.node);
				if (result) {
					page_cache_release(page);
					done_lh(&lh);
					goto error;
				}
				assert("vs-856", coord.between == AT_UNIT);
				item = ((char *)item_body_by_coord(&coord)) +
					coord.unit_pos;

				/* how many bytes to copy */
				count =
				    item_length_by_coord(&coord) -
				    coord.unit_pos;
				/* limit length of copy to end of page */
				if (count > PAGE_CACHE_SIZE - page_off)
					count = PAGE_CACHE_SIZE - page_off;

				/*
				 * copy item (as much as will fit starting from
				 * the beginning of the item) into the page
				 */
				p_data = kmap_atomic(page, KM_USER0);
				memcpy(p_data + page_off, item, count);
				kunmap_atomic(p_data, KM_USER0);

				page_off += count;
				bytes += count;
				set_key_offset(&key,
					       get_key_offset(&key) + count);

				zrelse(coord.node);
				done_lh(&lh);
			} /* end of loop which fills one page by content of
			   * formatting items */

			if (page_off) {
				/* something was copied into page */
				pages[i] = page;
			} else {
				page_cache_release(page);
				assert("vs-1648", done == 1);
				break;
			}
		} /* end of loop through pages of one conversion iteration */

		if (i > 0) {
			result = replace(inode, pages, i, bytes);
			release_all_pages(pages, sizeof_array(pages));
			if (result)
				goto error;
			/*
			 * We have to drop exclusive access to avoid deadlock
			 * which may happen because called by reiser4_writepages
			 * capture_unix_file requires to get non-exclusive
			 * access to a file. It is safe to drop EA in the middle
			 * of tail2extent conversion because write_unix_file,
			 * setattr_unix_file(truncate), mmap_unix_file,
			 * release_unix_file(extent2tail) checks if conversion
			 * is not in progress (see comments before
			 * get_exclusive_access_careful().
			 * Other processes that acquire non-exclusive access
			 * (read_unix_file, reiser4_writepages, etc) should work
			 * on partially converted files.
			 */
			drop_exclusive_access(uf_info);
			/* throttle the conversion
			   FIXME-EDWARD: Pass the precise number of pages
			   that was dirtied */
			reiser4_throttle_write(inode, 1);
			get_exclusive_access(uf_info);

			/*
			 * nobody is allowed to complete conversion but a
			 * process which started it
			 */
			assert("", reiser4_inode_get_flag(inode,
							  REISER4_PART_MIXED));
		}
	}
	if (result == 0) {
		/* file is converted to extent items */
		reiser4_inode_clr_flag(inode, REISER4_PART_IN_CONV);
		assert("vs-1697", reiser4_inode_get_flag(inode,
							 REISER4_PART_MIXED));

		uf_info->container = UF_CONTAINER_EXTENTS;
		complete_conversion(inode);
	} else {
		/*
		 * conversion is not complete. Inode was already marked as
		 * REISER4_PART_MIXED and stat-data were updated at the first
		 * iteration of the loop above.
		 */
	error:
		release_all_pages(pages, sizeof_array(pages));
		reiser4_inode_clr_flag(inode, REISER4_PART_IN_CONV);
		warning("edward-1548", "Partial conversion of %llu: %i",
			(unsigned long long)get_inode_oid(inode), result);
	}

 out:
	/* this flag should be cleared, otherwise get_exclusive_access_careful()
	   will fall into infinite loop */
	assert("edward-1549", !reiser4_inode_get_flag(inode,
						      REISER4_PART_IN_CONV));
	return result;
}