gfs2: add a helper function to get_log_header that can be used elsewhere

Move and re-order the error checks and hash/crc computations into another
function __get_log_header() so it can be used in scenarios where buffer_heads
are not being used for the log header.

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

diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index b0717a0..2dac430 100644 (file)
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -120,6 +120,35 @@ void gfs2_revoke_clean(struct gfs2_jdesc *jd)
        }
 }
 
+int __get_log_header(struct gfs2_sbd *sdp, const struct gfs2_log_header *lh,
+                    unsigned int blkno, struct gfs2_log_header_host *head)
+{
+       u32 hash, crc;
+
+       if (lh->lh_header.mh_magic != cpu_to_be32(GFS2_MAGIC) ||
+           lh->lh_header.mh_type != cpu_to_be32(GFS2_METATYPE_LH) ||
+           (blkno && be32_to_cpu(lh->lh_blkno) != blkno))
+               return 1;
+
+       hash = crc32(~0, lh, LH_V1_SIZE - 4);
+       hash = ~crc32_le_shift(hash, 4); /* assume lh_hash is zero */
+
+       if (be32_to_cpu(lh->lh_hash) != hash)
+               return 1;
+
+       crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
+                    sdp->sd_sb.sb_bsize - LH_V1_SIZE - 4);
+
+       if ((lh->lh_crc != 0 && be32_to_cpu(lh->lh_crc) != crc))
+               return 1;
+
+       head->lh_sequence = be64_to_cpu(lh->lh_sequence);
+       head->lh_flags = be32_to_cpu(lh->lh_flags);
+       head->lh_tail = be32_to_cpu(lh->lh_tail);
+       head->lh_blkno = be32_to_cpu(lh->lh_blkno);
+
+       return 0;
+}
 /**
  * get_log_header - read the log header for a given segment
  * @jd: the journal
@@ -137,36 +166,18 @@ void gfs2_revoke_clean(struct gfs2_jdesc *jd)
 static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
                          struct gfs2_log_header_host *head)
 {
-       struct gfs2_log_header *lh;
+       struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
        struct buffer_head *bh;
-       u32 hash, crc;
        int error;
 
        error = gfs2_replay_read_block(jd, blk, &bh);
        if (error)
                return error;
-       lh = (void *)bh->b_data;
-
-       hash = crc32(~0, lh, LH_V1_SIZE - 4);
-       hash = ~crc32_le_shift(hash, 4);  /* assume lh_hash is zero */
-
-       crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
-                    bh->b_size - LH_V1_SIZE - 4);
-
-       error = lh->lh_header.mh_magic != cpu_to_be32(GFS2_MAGIC) ||
-               lh->lh_header.mh_type != cpu_to_be32(GFS2_METATYPE_LH) ||
-               be32_to_cpu(lh->lh_blkno) != blk ||
-               be32_to_cpu(lh->lh_hash) != hash ||
-               (lh->lh_crc != 0 && be32_to_cpu(lh->lh_crc) != crc);
 
+       error = __get_log_header(sdp, (const struct gfs2_log_header *)bh->b_data,
+                                blk, head);
        brelse(bh);
 
-       if (!error) {
-               head->lh_sequence = be64_to_cpu(lh->lh_sequence);
-               head->lh_flags = be32_to_cpu(lh->lh_flags);
-               head->lh_tail = be32_to_cpu(lh->lh_tail);
-               head->lh_blkno = be32_to_cpu(lh->lh_blkno);
-       }
        return error;
 }
 

diff --git a/fs/gfs2/recovery.h b/fs/gfs2/recovery.h
index 11fdfab..11d8124 100644 (file)
--- a/fs/gfs2/recovery.h
+++ b/fs/gfs2/recovery.h
@@ -31,6 +31,9 @@ extern int gfs2_find_jhead(struct gfs2_jdesc *jd,
                    struct gfs2_log_header_host *head);
 extern int gfs2_recover_journal(struct gfs2_jdesc *gfs2_jd, bool wait);
 extern void gfs2_recover_func(struct work_struct *work);
+extern int __get_log_header(struct gfs2_sbd *sdp,
+                           const struct gfs2_log_header *lh, unsigned int blkno,
+                           struct gfs2_log_header_host *head);
 
 #endif /* __RECOVERY_DOT_H__ */