jbd2: sparse pointer use of zero as null

Get rid of sparse related warnings from places that use integer as NULL
pointer.  (Ported from upstream ext3/jbd changes.)

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 0c8adaba0c0b5d83c353b81b7851226bd5dd9236..b9b0b6f899b91b2000cc4f34e72c97931670fe53 100644 (file)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1182,7 +1182,7 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
        }
 
        /* That test should have eliminated the following case: */
-       J_ASSERT_JH(jh, jh->b_frozen_data == 0);
+       J_ASSERT_JH(jh, jh->b_frozen_data == NULL);
 
        JBUFFER_TRACE(jh, "file as BJ_Metadata");
        spin_lock(&journal->j_list_lock);
@@ -1532,7 +1532,7 @@ void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh)
 
        J_ASSERT_JH(jh, jh->b_jlist < BJ_Types);
        if (jh->b_jlist != BJ_None)
-               J_ASSERT_JH(jh, transaction != 0);
+               J_ASSERT_JH(jh, transaction != NULL);
 
        switch (jh->b_jlist) {
        case BJ_None:
@@ -1601,11 +1601,11 @@ __journal_try_to_free_buffer(journal_t *journal, struct buffer_head *bh)
        if (buffer_locked(bh) || buffer_dirty(bh))
                goto out;
 
-       if (jh->b_next_transaction != 0)
+       if (jh->b_next_transaction != NULL)
                goto out;
 
        spin_lock(&journal->j_list_lock);
-       if (jh->b_transaction != 0 && jh->b_cp_transaction == 0) {
+       if (jh->b_transaction != NULL && jh->b_cp_transaction == NULL) {
                if (jh->b_jlist == BJ_SyncData || jh->b_jlist == BJ_Locked) {
                        /* A written-back ordered data buffer */
                        JBUFFER_TRACE(jh, "release data");
@@ -1613,7 +1613,7 @@ __journal_try_to_free_buffer(journal_t *journal, struct buffer_head *bh)
                        jbd2_journal_remove_journal_head(bh);
                        __brelse(bh);
                }
-       } else if (jh->b_cp_transaction != 0 && jh->b_transaction == 0) {
+       } else if (jh->b_cp_transaction != NULL && jh->b_transaction == NULL) {
                /* written-back checkpointed metadata buffer */
                if (jh->b_jlist == BJ_None) {
                        JBUFFER_TRACE(jh, "remove from checkpoint list");
@@ -1973,7 +1973,7 @@ void __jbd2_journal_file_buffer(struct journal_head *jh,
 
        J_ASSERT_JH(jh, jh->b_jlist < BJ_Types);
        J_ASSERT_JH(jh, jh->b_transaction == transaction ||
-                               jh->b_transaction == 0);
+                               jh->b_transaction == NULL);
 
        if (jh->b_transaction && jh->b_jlist == jlist)
                return;