[PATCH] 64-bit jbd2 core

Here is the patch to JBD to handle 64 bit block numbers, originally from Zach
Brown.  This patch is useful only after adding support for 64-bit block
numbers in the filesystem.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 13 insertions, 4 deletions

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index b1a4eafc1541..44d68a113c73 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -271,6 +271,14 @@ write_out_data:
         journal_do_submit_data(wbuf, bufs);
 }
 
+static inline void write_tag_block(int tag_bytes, journal_block_tag_t *tag,
+                                   sector_t block)
+{
+        tag->t_blocknr = cpu_to_be32(block & (u32)~0);
+        if (tag_bytes > JBD_TAG_SIZE32)
+                tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1);
+}
+
 /*
  * jbd2_journal_commit_transaction
  *
@@ -293,6 +301,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         int first_tag = 0;
         int tag_flag;
         int i;
+        int tag_bytes = journal_tag_bytes(journal);
 
         /*
          * First job: lock down the current transaction and wait for
@@ -597,10 +606,10 @@ void jbd2_journal_commit_transaction(journal_t *journal)
                         tag_flag |= JBD2_FLAG_SAME_UUID;
 
                 tag = (journal_block_tag_t *) tagp;
-                tag->t_blocknr = cpu_to_be32(jh2bh(jh)->b_blocknr);
+                write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr);
                 tag->t_flags = cpu_to_be32(tag_flag);
-                tagp += sizeof(journal_block_tag_t);
-                space_left -= sizeof(journal_block_tag_t);
+                tagp += tag_bytes;
+                space_left -= tag_bytes;
 
                 if (first_tag) {
                         memcpy (tagp, journal->j_uuid, 16);
@@ -614,7 +623,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
 
                 if (bufs == journal->j_wbufsize ||
                     commit_transaction->t_buffers == NULL ||
-                    space_left < sizeof(journal_block_tag_t) + 16) {
+                    space_left < tag_bytes + 16) {
 
                         jbd_debug(4, "JBD: Submit %d IOs\n", bufs);