ext4: create function to read journal inode
Factor out the code used in ext4_get_journal() to read a valid journal
inode from storage, enabling its reuse in other functions.
Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 50912cc..056ca1b 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -78,6 +78,8 @@
static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
static void ext4_clear_request_list(void);
+static struct inode *ext4_get_journal_inode(struct super_block *sb,
+ unsigned int journal_inum);
/*
* Lock ordering
@@ -4237,18 +4239,16 @@
write_unlock(&journal->j_state_lock);
}
-static journal_t *ext4_get_journal(struct super_block *sb,
- unsigned int journal_inum)
+static struct inode *ext4_get_journal_inode(struct super_block *sb,
+ unsigned int journal_inum)
{
struct inode *journal_inode;
- journal_t *journal;
- BUG_ON(!ext4_has_feature_journal(sb));
-
- /* First, test for the existence of a valid inode on disk. Bad
- * things happen if we iget() an unused inode, as the subsequent
- * iput() will try to delete it. */
-
+ /*
+ * Test for the existence of a valid inode on disk. Bad things
+ * happen if we iget() an unused inode, as the subsequent iput()
+ * will try to delete it.
+ */
journal_inode = ext4_iget(sb, journal_inum);
if (IS_ERR(journal_inode)) {
ext4_msg(sb, KERN_ERR, "no journal found");
@@ -4268,6 +4268,20 @@
iput(journal_inode);
return NULL;
}
+ return journal_inode;
+}
+
+static journal_t *ext4_get_journal(struct super_block *sb,
+ unsigned int journal_inum)
+{
+ struct inode *journal_inode;
+ journal_t *journal;
+
+ BUG_ON(!ext4_has_feature_journal(sb));
+
+ journal_inode = ext4_get_journal_inode(sb, journal_inum);
+ if (!journal_inode)
+ return NULL;
journal = jbd2_journal_init_inode(journal_inode);
if (!journal) {