ext4: move the jbd2 wrapper functions out of super.c

Move the jbd2 wrapper functions which start and stop handles out of
super.c, where they don't really logically belong, and into
ext4_jbd2.c.

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

1 files changed, 101 insertions, 0 deletions

diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index b4323ba846b5..6f6114525535 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -6,6 +6,107 @@
 
 #include <trace/events/ext4.h>
 
+/* Just increment the non-pointer handle value */
+static handle_t *ext4_get_nojournal(void)
+{
+        handle_t *handle = current->journal_info;
+        unsigned long ref_cnt = (unsigned long)handle;
+
+        BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
+
+        ref_cnt++;
+        handle = (handle_t *)ref_cnt;
+
+        current->journal_info = handle;
+        return handle;
+}
+
+
+/* Decrement the non-pointer handle value */
+static void ext4_put_nojournal(handle_t *handle)
+{
+        unsigned long ref_cnt = (unsigned long)handle;
+
+        BUG_ON(ref_cnt == 0);
+
+        ref_cnt--;
+        handle = (handle_t *)ref_cnt;
+
+        current->journal_info = handle;
+}
+
+/*
+ * Wrappers for jbd2_journal_start/end.
+ */
+handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
+{
+        journal_t *journal;
+
+        trace_ext4_journal_start(sb, nblocks, _RET_IP_);
+        if (sb->s_flags & MS_RDONLY)
+                return ERR_PTR(-EROFS);
+
+        WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
+        journal = EXT4_SB(sb)->s_journal;
+        if (!journal)
+                return ext4_get_nojournal();
+        /*
+         * Special case here: if the journal has aborted behind our
+         * backs (eg. EIO in the commit thread), then we still need to
+         * take the FS itself readonly cleanly.
+         */
+        if (is_journal_aborted(journal)) {
+                ext4_abort(sb, "Detected aborted journal");
+                return ERR_PTR(-EROFS);
+        }
+        return jbd2_journal_start(journal, nblocks);
+}
+
+int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
+{
+        struct super_block *sb;
+        int err;
+        int rc;
+
+        if (!ext4_handle_valid(handle)) {
+                ext4_put_nojournal(handle);
+                return 0;
+        }
+        sb = handle->h_transaction->t_journal->j_private;
+        err = handle->h_err;
+        rc = jbd2_journal_stop(handle);
+
+        if (!err)
+                err = rc;
+        if (err)
+                __ext4_std_error(sb, where, line, err);
+        return err;
+}
+
+void ext4_journal_abort_handle(const char *caller, unsigned int line,
+                               const char *err_fn, struct buffer_head *bh,
+                               handle_t *handle, int err)
+{
+        char nbuf[16];
+        const char *errstr = ext4_decode_error(NULL, err, nbuf);
+
+        BUG_ON(!ext4_handle_valid(handle));
+
+        if (bh)
+                BUFFER_TRACE(bh, "abort");
+
+        if (!handle->h_err)
+                handle->h_err = err;
+
+        if (is_handle_aborted(handle))
+                return;
+
+        printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
+               caller, line, errstr, err_fn);
+
+        jbd2_journal_abort_handle(handle);
+}
+
 int __ext4_journal_get_write_access(const char *where, unsigned int line,
                                     handle_t *handle, struct buffer_head *bh)
 {