ocfs2: use allocation reservations for directory data

Use the reservations system for unindexed dir tree allocations. We don't
bother with the indexed tree as reads from it are mostly random anyway.
Directory reservations are marked seperately, to allow the reservations code
a chance to optimize their window sizes. This patch allocates only 8 bits
for directory windows as they generally are not expected to grow as quickly
as file data. Future improvements to dir window sizing can trivially be
made.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>

5 files changed, 17 insertions, 3 deletions

diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 6d832487c187..8563f97c58af 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -2977,6 +2977,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
          * if we only get one now, that's enough to continue. The rest
          * will be claimed after the conversion to extents.
          */
+        data_ac->ac_resv = &oi->ip_la_data_resv;
         ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
         if (ret) {
                 mlog_errno(ret);
@@ -3347,6 +3348,8 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
                         goto bail;
                 }
 
+                data_ac->ac_resv = &OCFS2_I(dir)->ip_la_data_resv;
+
                 credits = ocfs2_calc_extend_credits(sb, el, 1);
         } else {
                 spin_unlock(&OCFS2_I(dir)->ip_lock);
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 62b4743fb6f1..9ee13f70da57 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -377,6 +377,10 @@ void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 
         OCFS2_I(inode)->ip_last_used_slot = 0;
         OCFS2_I(inode)->ip_last_used_group = 0;
+
+        if (S_ISDIR(inode->i_mode))
+                ocfs2_resv_set_type(&OCFS2_I(inode)->ip_la_data_resv,
+                                    OCFS2_RESV_FLAG_DIR);
         mlog_exit_void();
 }
 
diff --git a/fs/ocfs2/reservations.c b/fs/ocfs2/reservations.c
index 79642d608210..7fc6cfee95f1 100644
--- a/fs/ocfs2/reservations.c
+++ b/fs/ocfs2/reservations.c
@@ -44,6 +44,7 @@ DEFINE_SPINLOCK(resv_lock);
 
 #define OCFS2_MIN_RESV_WINDOW_BITS      8
 #define OCFS2_MAX_RESV_WINDOW_BITS      1024
+#define OCFS2_RESV_DIR_WINDOW_BITS      OCFS2_MIN_RESV_WINDOW_BITS
 
 static unsigned int ocfs2_resv_window_bits(struct ocfs2_reservation_map *resmap,
                                            struct ocfs2_alloc_reservation *resv)
@@ -51,8 +52,11 @@ static unsigned int ocfs2_resv_window_bits(struct ocfs2_reservation_map *resmap,
         struct ocfs2_super *osb = resmap->m_osb;
         unsigned int bits;
 
-        /* 8, 16, 32, 64, 128, 256, 512, 1024 */
-        bits = 4 << osb->osb_resv_level;
+        if (!(resv->r_flags & OCFS2_RESV_FLAG_DIR)) {
+                /* 8, 16, 32, 64, 128, 256, 512, 1024 */
+                bits = 4 << osb->osb_resv_level;
+        } else
+                bits = OCFS2_RESV_DIR_WINDOW_BITS;
 
         return bits;
 }
diff --git a/fs/ocfs2/reservations.h b/fs/ocfs2/reservations.h
index 8341cd0ef855..34bb308375c5 100644
--- a/fs/ocfs2/reservations.h
+++ b/fs/ocfs2/reservations.h
@@ -42,6 +42,8 @@ struct ocfs2_alloc_reservation {
 #define OCFS2_RESV_FLAG_INUSE   0x01    /* Set when r_node is part of a btree */
 #define OCFS2_RESV_FLAG_TMP     0x02    /* Temporary reservation, will be
                                          * destroyed immedately after use */
+#define OCFS2_RESV_FLAG_DIR     0x04    /* Reservation is for an unindexed
+                                         * directory btree */
 
 struct ocfs2_reservation_map {
         struct rb_root          m_reservations;
@@ -61,7 +63,7 @@ struct ocfs2_reservation_map {
 
 void ocfs2_resv_init_once(struct ocfs2_alloc_reservation *resv);
 
-#define OCFS2_RESV_TYPES        (OCFS2_RESV_FLAG_TMP)
+#define OCFS2_RESV_TYPES        (OCFS2_RESV_FLAG_TMP|OCFS2_RESV_FLAG_DIR)
 void ocfs2_resv_set_type(struct ocfs2_alloc_reservation *resv,
                          unsigned int flags);
 
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index d4babfba4f04..f20bcbf64ce0 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -130,6 +130,7 @@ void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
         }
         brelse(ac->ac_bh);
         ac->ac_bh = NULL;
+        ac->ac_resv = NULL;
 }
 
 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)