gfs2: move check_journal_clean to util.c for future use

[linux-2.6-microblaze.git] / fs / gfs2 / util.c

diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 47cd40d..86965e6 100644 (file)
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -16,7 +16,10 @@
 #include "gfs2.h"
 #include "incore.h"
 #include "glock.h"
+#include "lops.h"
+#include "recovery.h"
 #include "rgrp.h"
+#include "super.h"
 #include "util.h"
 
 struct kmem_cache *gfs2_glock_cachep __read_mostly;
@@ -33,6 +36,48 @@ void gfs2_assert_i(struct gfs2_sbd *sdp)
        fs_emerg(sdp, "fatal assertion failed\n");
 }
 
+/**
+ * check_journal_clean - Make sure a journal is clean for a spectator mount
+ * @sdp: The GFS2 superblock
+ * @jd: The journal descriptor
+ *
+ * Returns: 0 if the journal is clean or locked, else an error
+ */
+int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
+{
+       int error;
+       struct gfs2_holder j_gh;
+       struct gfs2_log_header_host head;
+       struct gfs2_inode *ip;
+
+       ip = GFS2_I(jd->jd_inode);
+       error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
+                                  GL_EXACT | GL_NOCACHE, &j_gh);
+       if (error) {
+               fs_err(sdp, "Error locking journal for spectator mount.\n");
+               return -EPERM;
+       }
+       error = gfs2_jdesc_check(jd);
+       if (error) {
+               fs_err(sdp, "Error checking journal for spectator mount.\n");
+               goto out_unlock;
+       }
+       error = gfs2_find_jhead(jd, &head, false);
+       if (error) {
+               fs_err(sdp, "Error parsing journal for spectator mount.\n");
+               goto out_unlock;
+       }
+       if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
+               error = -EPERM;
+               fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
+                      "must not be a spectator.\n", jd->jd_jid);
+       }
+
+out_unlock:
+       gfs2_glock_dq_uninit(&j_gh);
+       return error;
+}
+
 void gfs2_lm(struct gfs2_sbd *sdp, const char *fmt, ...)
 {
        struct va_format vaf;