@@ -1095,6 +1095,8 @@ extern int ext4_chunk_trans_blocks(struc
extern int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from);
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
+extern int ext4_release_metadata(void *client, struct page *page,
+ gfp_t wait);
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
@@ -3002,6 +3002,28 @@ static int ext4_releasepage(struct page
}
/*
+ * ext4_release_metadata: try to release own page.
+ * The mapping of this page is block device's. Therefore try_to_free_buffers()
+ * cannot release it. As a result, a function which releases own page is
+ * required.
+ */
+int ext4_release_metadata(void *client, struct page *page, gfp_t wait)
+{
+ struct super_block *sb = (struct super_block*)client;
+ journal_t *journal;
+
+ WARN_ON(PageChecked(page));
+ if (!page_has_buffers(page))
+ return 0;
+ BUG_ON(EXT4_SB(sb) == NULL);
+ journal = EXT4_SB(sb)->s_journal;
+ if (journal != NULL)
+ return jbd2_journal_try_to_free_buffers(journal, page, wait);
+ else
+ return try_to_free_buffers(page);
+}
+
+/*
* If the O_DIRECT write will extend the file then add this inode to the
* orphan list. So recovery will truncate it back to the original size
* if the machine crashes during the write.
@@ -3543,6 +3543,8 @@ static struct file_system_type ext4_fs_t
.name = "ext4",
.get_sb = ext4_get_sb,
.kill_sb = kill_block_super,
+ .release_metadata
+ = ext4_release_metadata,
.fs_flags = FS_REQUIRES_DEV,
};
@@ -3562,6 +3564,8 @@ static struct file_system_type ext4dev_f
.name = "ext4dev",
.get_sb = ext4dev_get_sb,
.kill_sb = kill_block_super,
+ .release_metadata
+ = ext4_release_metadata,
.fs_flags = FS_REQUIRES_DEV,
};
MODULE_ALIAS("ext4dev");