[GFS2] Clean up gfs2_trans_add_revoke()
The following alters gfs2_trans_add_revoke() to take a struct
gfs2_bufdata as an argument. This eliminates the memory allocation which
was previously required by making use of the already existing struct
gfs2_bufdata. It makes some sanity checks to ensure that the
gfs2_bufdata has been removed from all the lists before its recycled as
a revoke structure. This saves one memory allocation and one free per
revoke structure.
Also as a result, and to simplify the locking, since there is no longer
any blocking code in gfs2_trans_add_revoke() we must hold the log lock
whenever this function is called. This reduces the amount of times we
take and unlock the log lock.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index d762e4f7..19097bc7 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -313,42 +313,31 @@
while (blen) {
bh = getbuf(ip->i_gl, bstart, NO_CREATE);
if (bh) {
- struct gfs2_bufdata *bd = bh->b_private;
+ struct gfs2_bufdata *bd;
+ lock_buffer(bh);
+ gfs2_log_lock(sdp);
+ bd = bh->b_private;
if (test_clear_buffer_pinned(bh)) {
struct gfs2_trans *tr = current->journal_info;
- struct gfs2_inode *bh_ip =
- GFS2_I(bh->b_page->mapping->host);
-
- gfs2_log_lock(sdp);
list_del_init(&bd->bd_le.le_list);
gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
sdp->sd_log_num_buf--;
- gfs2_log_unlock(sdp);
- if (bh_ip->i_inode.i_private != NULL)
- tr->tr_num_databuf_rm++;
- else
- tr->tr_num_buf_rm++;
+ tr->tr_num_buf_rm++;
brelse(bh);
}
if (bd) {
- gfs2_log_lock(sdp);
if (bd->bd_ail) {
- u64 blkno = bh->b_blocknr;
- bd->bd_ail = NULL;
- list_del(&bd->bd_ail_st_list);
- list_del(&bd->bd_ail_gl_list);
- atomic_dec(&bd->bd_gl->gl_ail_count);
- brelse(bh);
- gfs2_log_unlock(sdp);
- gfs2_trans_add_revoke(sdp, blkno);
- } else
- gfs2_log_unlock(sdp);
+ gfs2_remove_from_ail(NULL, bd);
+ bh->b_private = NULL;
+ bd->bd_bh = NULL;
+ bd->bd_blkno = bh->b_blocknr;
+ gfs2_trans_add_revoke(sdp, bd);
+ }
}
-
- lock_buffer(bh);
clear_buffer_dirty(bh);
clear_buffer_uptodate(bh);
+ gfs2_log_unlock(sdp);
unlock_buffer(bh);
brelse(bh);