gfs2: Fix freeze consistency check in gfs2_trans_add_meta

Function gfs2_trans_add_meta() checks for the SDF_FROZEN flag to make
sure that no buffers are added to a transaction while the filesystem is
frozen.  With the recent freeze/thaw rework, the SDF_FROZEN flag is
cleared after thaw_super() is called, which is sufficient for
serializing freeze/thaw.

However, other filesystem operations started after thaw_super() may now
be calling gfs2_trans_add_meta() before the SDF_FROZEN flag is cleared,
which will trigger the SDF_FROZEN check in gfs2_trans_add_meta().  Fix
that by checking the s_writers.frozen state instead.

In addition, make sure not to call gfs2_assert_withdraw() with the
sd_log_lock spin lock held.  Check for a withdrawn filesystem before
checking for a frozen filesystem, and don't pin/add buffers to the
current transaction in case of a failure in either case.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index ec16312..7e835be 100644 (file)
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -230,9 +230,11 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 {
 
        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+       struct super_block *sb = sdp->sd_vfs;
        struct gfs2_bufdata *bd;
        struct gfs2_meta_header *mh;
        struct gfs2_trans *tr = current->journal_info;
+       bool withdraw = false;
 
        lock_buffer(bh);
        if (buffer_pinned(bh)) {
@@ -266,13 +268,15 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
                       (unsigned long long)bd->bd_bh->b_blocknr);
                BUG();
        }
-       if (unlikely(test_bit(SDF_FROZEN, &sdp->sd_flags))) {
-               fs_info(sdp, "GFS2:adding buf while frozen\n");
-               gfs2_assert_withdraw(sdp, 0);
-       }
        if (unlikely(gfs2_withdrawn(sdp))) {
                fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n",
                        (unsigned long long)bd->bd_bh->b_blocknr);
+               goto out_unlock;
+       }
+       if (unlikely(sb->s_writers.frozen == SB_FREEZE_COMPLETE)) {
+               fs_info(sdp, "GFS2:adding buf while frozen\n");
+               withdraw = true;
+               goto out_unlock;
        }
        gfs2_pin(sdp, bd->bd_bh);
        mh->__pad0 = cpu_to_be64(0);
@@ -281,6 +285,8 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
        tr->tr_num_buf_new++;
 out_unlock:
        gfs2_log_unlock(sdp);
+       if (withdraw)
+               gfs2_assert_withdraw(sdp, 0);
 out:
        unlock_buffer(bh);
 }