[PATCH] ext4: Rename pa_linear to pa_type

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

Impact: code cleanup

This patch rename pa_linear to pa_type and add MB_INODE_PA
and MB_GROUP_PA to indicate inode and group prealloc space.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

---
 fs/ext4/mballoc.c |   14 +++++++-------
 fs/ext4/mballoc.h |    7 +++++--
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 4415bee..72331ce 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3696,7 +3696,7 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
 	INIT_LIST_HEAD(&pa->pa_inode_list);
 	INIT_LIST_HEAD(&pa->pa_group_list);
 	pa->pa_deleted = 0;
-	pa->pa_linear = 0;
+	pa->pa_type = MB_INODE_PA;
 
 	mb_debug("new inode pa %p: %llu/%u for %u\n", pa,
 			pa->pa_pstart, pa->pa_len, pa->pa_lstart);
@@ -3759,7 +3759,7 @@ ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
 	INIT_LIST_HEAD(&pa->pa_inode_list);
 	INIT_LIST_HEAD(&pa->pa_group_list);
 	pa->pa_deleted = 0;
-	pa->pa_linear = 1;
+	pa->pa_type = MB_GROUP_PA;
 
 	mb_debug("new group pa %p: %llu/%u for %u\n", pa,
 		 pa->pa_pstart, pa->pa_len, pa->pa_lstart);
@@ -4013,7 +4013,7 @@ repeat:
 		list_del_rcu(&pa->pa_inode_list);
 		spin_unlock(pa->pa_obj_lock);
 
-		if (pa->pa_linear)
+		if (pa->pa_type == MB_GROUP_PA)
 			ext4_mb_release_group_pa(&e4b, pa, ac);
 		else
 			ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa, ac);
@@ -4113,7 +4113,7 @@ repeat:
 	spin_unlock(&ei->i_prealloc_lock);
 
 	list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) {
-		BUG_ON(pa->pa_linear != 0);
+		BUG_ON(pa->pa_type != MB_INODE_PA);
 		ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, NULL);
 
 		err = ext4_mb_load_buddy(sb, group, &e4b);
@@ -4365,7 +4365,7 @@ ext4_mb_discard_lg_preallocations(struct super_block *sb,
 			continue;
 		}
 		/* only lg prealloc space */
-		BUG_ON(!pa->pa_linear);
+		BUG_ON(pa->pa_type != MB_GROUP_PA);
 
 		/* seems this one can be freed ... */
 		pa->pa_deleted = 1;
@@ -4471,7 +4471,7 @@ static int ext4_mb_release_context(struct ext4_allocation_context *ac)
 {
 	struct ext4_prealloc_space *pa = ac->ac_pa;
 	if (pa) {
-		if (pa->pa_linear) {
+		if (pa->pa_type == MB_GROUP_PA) {
 			/* see comment in ext4_mb_use_group_pa() */
 			spin_lock(&pa->pa_lock);
 			pa->pa_pstart += ac->ac_b_ex.fe_len;
@@ -4491,7 +4491,7 @@ static int ext4_mb_release_context(struct ext4_allocation_context *ac)
 		 * doesn't grow big.  We need to release
 		 * alloc_semp before calling ext4_mb_add_n_trim()
 		 */
-		if (pa->pa_linear && likely(pa->pa_free)) {
+		if ((pa->pa_type == MB_GROUP_PA) && likely(pa->pa_free)) {
 			spin_lock(pa->pa_obj_lock);
 			list_del_rcu(&pa->pa_inode_list);
 			spin_unlock(pa->pa_obj_lock);
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index 10a2921..340cc4b 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -132,12 +132,15 @@ struct ext4_prealloc_space {
 	ext4_lblk_t		pa_lstart;	/* log. block */
 	unsigned short		pa_len;		/* len of preallocated chunk */
 	unsigned short		pa_free;	/* how many blocks are free */
-	unsigned short		pa_linear;	/* consumed in one direction
-						 * strictly, for grp prealloc */
+	unsigned short		pa_type;	/* pa type. inode or group */
 	spinlock_t		*pa_obj_lock;
 	struct inode		*pa_inode;	/* hack, for history only */
 };
 
+enum {
+	MB_INODE_PA = 0,
+	MB_GROUP_PA = 1
+};
 
 struct ext4_free_extent {
 	ext4_lblk_t fe_logical;
-- 
tg: (5bee17f..) pa_linear_rename (depends on: master)