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-rw-r--r--fs/ufs/util.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/fs/ufs/util.c b/fs/ufs/util.c
index a2f13f4..337cf2c 100644
--- a/fs/ufs/util.c
+++ b/fs/ufs/util.c
@@ -233,3 +233,57 @@ ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev
else
ufsi->i_u1.i_data[0] = fs32;
}
+
+/**
+ * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
+ * read it from disk.
+ * @mapping: the address_space to search
+ * @index: the page index
+ *
+ * Locates the desired pagecache page, if not exist we'll read it,
+ * locks it, increments its reference
+ * count and returns its address.
+ *
+ */
+
+struct page *ufs_get_locked_page(struct address_space *mapping,
+ pgoff_t index)
+{
+ struct page *page;
+
+try_again:
+ page = find_lock_page(mapping, index);
+ if (!page) {
+ page = read_cache_page(mapping, index,
+ (filler_t*)mapping->a_ops->readpage,
+ NULL);
+ if (IS_ERR(page)) {
+ printk(KERN_ERR "ufs_change_blocknr: "
+ "read_cache_page error: ino %lu, index: %lu\n",
+ mapping->host->i_ino, index);
+ goto out;
+ }
+
+ lock_page(page);
+
+ if (!PageUptodate(page) || PageError(page)) {
+ unlock_page(page);
+ page_cache_release(page);
+
+ printk(KERN_ERR "ufs_change_blocknr: "
+ "can not read page: ino %lu, index: %lu\n",
+ mapping->host->i_ino, index);
+
+ page = ERR_PTR(-EIO);
+ goto out;
+ }
+ }
+
+ if (unlikely(!page->mapping || !page_has_buffers(page))) {
+ unlock_page(page);
+ page_cache_release(page);
+ goto try_again;/*we really need these buffers*/
+ }
+out:
+ return page;
+}
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