[GFS2] Fix bmap to map extents properly

This fix means that bmap will map extents of the length requested
by the VFS rather than guessing at it, or just mapping one block
at a time. The other callers of gfs2_block_map are audited to ensure
they send the correct max extent lengths (i.e. set bh->b_size correctly).

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index c69b94a55588..a3deae7416c9 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -251,7 +251,7 @@ static int bh_get(struct gfs2_quota_data *qd)
         unsigned int block, offset;
         struct buffer_head *bh;
         int error;
-        struct buffer_head bh_map;
+        struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 
         mutex_lock(&sdp->sd_quota_mutex);
 
@@ -263,7 +263,8 @@ static int bh_get(struct gfs2_quota_data *qd)
         block = qd->qd_slot / sdp->sd_qc_per_block;
         offset = qd->qd_slot % sdp->sd_qc_per_block;;
 
-        error = gfs2_block_map(&ip->i_inode, block, 0, &bh_map, 1);
+        bh_map.b_size = 1 << ip->i_inode.i_blkbits;
+        error = gfs2_block_map(&ip->i_inode, block, 0, &bh_map);
         if (error)
                 goto fail;
         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);