[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, 30 insertions, 13 deletions

diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index b2012d112432..2486843adda0 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -178,19 +178,20 @@ static int jread(struct buffer_head **bhp, journal_t *journal,
  * Count the number of in-use tags in a journal descriptor block.
  */
 
-static int count_tags(struct buffer_head *bh, int size)
+static int count_tags(journal_t *journal, struct buffer_head *bh)
 {
         char *                  tagp;
         journal_block_tag_t *   tag;
-        int                     nr = 0;
+        int                     nr = 0, size = journal->j_blocksize;
+        int                     tag_bytes = journal_tag_bytes(journal);
 
         tagp = &bh->b_data[sizeof(journal_header_t)];
 
-        while ((tagp - bh->b_data + sizeof(journal_block_tag_t)) <= size) {
+        while ((tagp - bh->b_data + tag_bytes) <= size) {
                 tag = (journal_block_tag_t *) tagp;
 
                 nr++;
-                tagp += sizeof(journal_block_tag_t);
+                tagp += tag_bytes;
                 if (!(tag->t_flags & cpu_to_be32(JBD2_FLAG_SAME_UUID)))
                         tagp += 16;
 
@@ -307,6 +308,14 @@ int jbd2_journal_skip_recovery(journal_t *journal)
         return err;
 }
 
+static inline sector_t read_tag_block(int tag_bytes, journal_block_tag_t *tag)
+{
+        sector_t block = be32_to_cpu(tag->t_blocknr);
+        if (tag_bytes > JBD_TAG_SIZE32)
+                block |= (u64)be32_to_cpu(tag->t_blocknr_high) << 32;
+        return block;
+}
+
 static int do_one_pass(journal_t *journal,
                         struct recovery_info *info, enum passtype pass)
 {
@@ -318,11 +327,12 @@ static int do_one_pass(journal_t *journal,
         struct buffer_head *    bh;
         unsigned int            sequence;
         int                     blocktype;
+        int                     tag_bytes = journal_tag_bytes(journal);
 
         /* Precompute the maximum metadata descriptors in a descriptor block */
         int                     MAX_BLOCKS_PER_DESC;
         MAX_BLOCKS_PER_DESC = ((journal->j_blocksize-sizeof(journal_header_t))
-                               / sizeof(journal_block_tag_t));
+                               / tag_bytes);
 
         /*
          * First thing is to establish what we expect to find in the log
@@ -412,8 +422,7 @@ static int do_one_pass(journal_t *journal,
                          * in pass REPLAY; otherwise, just skip over the
                          * blocks it describes. */
                         if (pass != PASS_REPLAY) {
-                                next_log_block +=
-                                        count_tags(bh, journal->j_blocksize);
+                                next_log_block += count_tags(journal, bh);
                                 wrap(journal, next_log_block);
                                 brelse(bh);
                                 continue;
@@ -424,7 +433,7 @@ static int do_one_pass(journal_t *journal,
                          * getting done here! */
 
                         tagp = &bh->b_data[sizeof(journal_header_t)];
-                        while ((tagp - bh->b_data +sizeof(journal_block_tag_t))
+                        while ((tagp - bh->b_data + tag_bytes)
                                <= journal->j_blocksize) {
                                 unsigned long io_block;
 
@@ -446,7 +455,8 @@ static int do_one_pass(journal_t *journal,
                                         unsigned long blocknr;
 
                                         J_ASSERT(obh != NULL);
-                                        blocknr = be32_to_cpu(tag->t_blocknr);
+                                        blocknr = read_tag_block(tag_bytes,
+                                                                 tag);
 
                                         /* If the block has been
                                          * revoked, then we're all done
@@ -494,7 +504,7 @@ static int do_one_pass(journal_t *journal,
                                 }
 
                         skip_write:
-                                tagp += sizeof(journal_block_tag_t);
+                                tagp += tag_bytes;
                                 if (!(flags & JBD2_FLAG_SAME_UUID))
                                         tagp += 16;
 
@@ -572,17 +582,24 @@ static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
 {
         jbd2_journal_revoke_header_t *header;
         int offset, max;
+        int record_len = 4;
 
         header = (jbd2_journal_revoke_header_t *) bh->b_data;
         offset = sizeof(jbd2_journal_revoke_header_t);
         max = be32_to_cpu(header->r_count);
 
-        while (offset < max) {
+        if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT))
+                record_len = 8;
+
+        while (offset + record_len <= max) {
                 unsigned long blocknr;
                 int err;
 
-                blocknr = be32_to_cpu(* ((__be32 *) (bh->b_data+offset)));
-                offset += 4;
+                if (record_len == 4)
+                        blocknr = be32_to_cpu(* ((__be32 *) (bh->b_data+offset)));
+                else
+                        blocknr = be64_to_cpu(* ((__be64 *) (bh->b_data+offset)));
+                offset += record_len;
                 err = jbd2_journal_set_revoke(journal, blocknr, sequence);
                 if (err)
                         return err;