shmem: Comment fixups

}

/*

 * Remove range of pages and swap entries from radix tree, and free them.

 * Remove range of pages and swap entries from page cache, and free them.

 * If !unfalloc, truncate or punch hole; if unfalloc, undo failed fallocate.

 */

static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,

		 * We needed to drop mutex to make that restrictive page

		 * allocation, but the inode might have been freed while we

		 * dropped it: although a racing shmem_evict_inode() cannot

		 * complete without emptying the radix_tree, our page lock

		 * complete without emptying the page cache, our page lock

		 * on this swapcache page is not enough to prevent that -

		 * free_swap_and_cache() of our swap entry will only

		 * trylock_page(), removing swap from radix_tree whatever.

		 * trylock_page(), removing swap from page cache whatever.

		 *

		 * We must not proceed to shmem_add_to_page_cache() if the

		 * inode has been freed, but of course we cannot rely on

					    &memcg, false);

	if (error)

		goto out;

	/* No radix_tree_preload: swap entry keeps a place for page in tree */

	/* No memory allocation: swap entry occupies the slot for the page */

	error = -EAGAIN;

	mutex_lock(&shmem_swaplist_mutex);

		spin_unlock_irq(&info->lock);

		goto repeat;

	}

	if (error == -EEXIST)	/* from above or from radix_tree_insert */

	if (error == -EEXIST)

		goto repeat;

	return error;

}

}

/*

 * llseek SEEK_DATA or SEEK_HOLE through the radix_tree.

 * llseek SEEK_DATA or SEEK_HOLE through the page cache.

 */

static pgoff_t shmem_seek_hole_data(struct address_space *mapping,

				    pgoff_t index, pgoff_t end, int whence)