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[GFS2] Clean up gfs2_trans_add_revoke()

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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>
This commit is contained in:
Steven Whitehouse
2007-09-03 11:01:33 +01:00
parent 0820ab517e
commit 1ad38c437f
6 changed files with 25 additions and 43 deletions
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10
fs/gfs2/trans.c
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@@ -142,12 +142,12 @@ void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
lops_add(sdp, &bd->bd_le);
}
void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, u64 blkno)
void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
struct gfs2_bufdata *bd = kmem_cache_alloc(gfs2_bufdata_cachep,
GFP_NOFS | __GFP_NOFAIL);
BUG_ON(!list_empty(&bd->bd_le.le_list));
BUG_ON(!list_empty(&bd->bd_ail_st_list));
BUG_ON(!list_empty(&bd->bd_ail_gl_list));
lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
bd->bd_blkno = blkno;
lops_add(sdp, &bd->bd_le);
}
@@ -160,7 +160,7 @@ void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno)
list_for_each_entry(bd, &sdp->sd_log_le_revoke, bd_le.le_list) {
if (bd->bd_blkno == blkno) {
list_del(&bd->bd_le.le_list);
list_del_init(&bd->bd_le.le_list);
gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
sdp->sd_log_num_revoke--;
found = 1;