ext4: move ext4_forget() to ext4_jbd2.c

The ext4_forget() function better belongs in ext4_jbd2.c.  This will
allow us to do some cleanup of the ext4_journal_revoke() and
ext4_journal_forget() functions, as well as giving us better error
reporting since we can report the caller of ext4_forget() when things
go wrong.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 56 insertions, 0 deletions

diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index 6a9409920dee..913f85715433 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -4,6 +4,8 @@
 
 #include "ext4_jbd2.h"
 
+#include <trace/events/ext4.h>
+
 int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
                                 struct buffer_head *bh)
 {
@@ -64,6 +66,60 @@ int __ext4_journal_revoke(const char *where, handle_t *handle,
         return err;
 }
 
+/*
+ * The ext4 forget function must perform a revoke if we are freeing data
+ * which has been journaled.  Metadata (eg. indirect blocks) must be
+ * revoked in all cases.
+ *
+ * "bh" may be NULL: a metadata block may have been freed from memory
+ * but there may still be a record of it in the journal, and that record
+ * still needs to be revoked.
+ *
+ * If the handle isn't valid we're not journaling, but we still need to
+ * call into ext4_journal_revoke() to put the buffer head.
+ */
+int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
+                  struct inode *inode, struct buffer_head *bh,
+                  ext4_fsblk_t blocknr)
+{
+        int err;
+
+        might_sleep();
+
+        trace_ext4_forget(inode, is_metadata, blocknr);
+        BUFFER_TRACE(bh, "enter");
+
+        jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
+                  "data mode %x\n",
+                  bh, is_metadata, inode->i_mode,
+                  test_opt(inode->i_sb, DATA_FLAGS));
+
+        /* Never use the revoke function if we are doing full data
+         * journaling: there is no need to, and a V1 superblock won't
+         * support it.  Otherwise, only skip the revoke on un-journaled
+         * data blocks. */
+
+        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
+            (!is_metadata && !ext4_should_journal_data(inode))) {
+                if (bh) {
+                        BUFFER_TRACE(bh, "call jbd2_journal_forget");
+                        return __ext4_journal_forget(where, handle, bh);
+                }
+                return 0;
+        }
+
+        /*
+         * data!=journal && (is_metadata || should_journal_data(inode))
+         */
+        BUFFER_TRACE(bh, "call ext4_journal_revoke");
+        err = __ext4_journal_revoke(where, handle, blocknr, bh);
+        if (err)
+                ext4_abort(inode->i_sb, __func__,
+                           "error %d when attempting revoke", err);
+        BUFFER_TRACE(bh, "exit");
+        return err;
+}
+
 int __ext4_journal_get_create_access(const char *where,
                                 handle_t *handle, struct buffer_head *bh)
 {