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[PATCH 02/12] repair: allocate and free inode records individually

To: xfs@xxxxxxxxxxx
Subject: [PATCH 02/12] repair: allocate and free inode records individually
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 02 Dec 2011 12:46:21 -0500
References: <20111202174619.179530033@xxxxxxxxxxxxxxxxxxxxxx>
User-agent: quilt/0.48-1
Instead of allocating inode records in chunks and keeping a freelist of them
which never gets released to the system memory allocator use plain malloc
and free for them.  The freelist just means adding a global lock instead
of relying on malloc and free which could be implemented lockless, and the
freelist is almost completely worthless as we are done allocating new
inode records once we start freeing them in major quantities.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: xfsprogs-dev/repair/incore_ino.c
===================================================================
--- xfsprogs-dev.orig/repair/incore_ino.c       2011-11-09 18:52:15.041861085 
+0000
+++ xfsprogs-dev/repair/incore_ino.c    2011-11-09 19:36:39.389806408 +0000
@@ -25,7 +25,6 @@
 #include "threads.h"
 #include "err_protos.h"
 
-static pthread_mutex_t ino_flist_lock;
 extern avlnode_t       *avl_firstino(avlnode_t *root);
 
 /*
@@ -38,18 +37,6 @@
  */
 static avltree_desc_t  **inode_uncertain_tree_ptrs;
 
-#define ALLOC_NUM_INOS         100
-
-/* free lists -- inode nodes and extent nodes */
-
-typedef struct ino_flist_s  {
-       ino_tree_node_t         *list;
-       ino_tree_node_t         *last;
-       long long               cnt;
-} ino_flist_t;
-
-static ino_flist_t ino_flist;  /* free list must be initialized before use */
-
 /* memory optimised nlink counting for all inodes */
 
 static void nlink_grow_8_to_16(ino_tree_node_t *irec);
@@ -238,102 +225,63 @@
 }
 
 /*
- * next is the uncertain inode list -- a sorted (in ascending order)
+ * Next is the uncertain inode list -- a sorted (in ascending order)
  * list of inode records sorted on the starting inode number.  There
  * is one list per ag.
  */
 
 /*
- * common code for creating inode records for use by trees and lists.
+ * Common code for creating inode records for use by trees and lists.
  * called only from add_inodes and add_inodes_uncertain
  *
  * IMPORTANT:  all inodes (inode records) start off as free and
  *             unconfirmed.
  */
-/* ARGSUSED */
-static ino_tree_node_t *
-mk_ino_tree_nodes(
+static struct ino_tree_node *
+alloc_ino_node(
        xfs_agino_t             starting_ino)
 {
-       int                     i;
-       ino_tree_node_t         *ino_rec;
-       avlnode_t               *node;
-
-       pthread_mutex_lock(&ino_flist_lock);
-       if (ino_flist.cnt == 0)  {
-               ASSERT(ino_flist.list == NULL);
-
-               if ((ino_rec = malloc(sizeof(ino_tree_node_t[ALLOC_NUM_INOS])))
-                                       == NULL)
-                       do_error(_("inode map malloc failed\n"));
-
-               for (i = 0; i < ALLOC_NUM_INOS; i++)  {
-                       ino_rec->avl_node.avl_nextino =
-                               (avlnode_t *) ino_flist.list;
-                       ino_flist.list = ino_rec;
-                       ino_flist.cnt++;
-                       ino_rec++;
-               }
-       }
+       struct ino_tree_node    *irec;
 
-       ASSERT(ino_flist.list != NULL);
-
-       ino_rec = ino_flist.list;
-       ino_flist.list = (ino_tree_node_t *) ino_rec->avl_node.avl_nextino;
-       ino_flist.cnt--;
-       node = &ino_rec->avl_node;
-       node->avl_nextino = node->avl_forw = node->avl_back = NULL;
-       pthread_mutex_unlock(&ino_flist_lock);
-
-       /* initialize node */
-
-       ino_rec->ino_startnum = 0;
-       ino_rec->ino_confirmed = 0;
-       ino_rec->ino_isa_dir = 0;
-       ino_rec->ir_free = (xfs_inofree_t) - 1;
-       ino_rec->ino_un.ex_data = NULL;
-       ino_rec->nlinkops = &nlinkops[0];
-       ino_rec->disk_nlinks = calloc(1, nlinkops[0].nlink_size);
-       if (ino_rec->disk_nlinks == NULL)
+       irec = malloc(sizeof(*irec));
+       if (!irec)
+               do_error(_("inode map malloc failed\n"));
+
+       irec->avl_node.avl_nextino = NULL;
+       irec->avl_node.avl_forw = NULL;
+       irec->avl_node.avl_back = NULL;
+
+       irec->ino_startnum = starting_ino;
+       irec->ino_confirmed = 0;
+       irec->ino_isa_dir = 0;
+       irec->ir_free = (xfs_inofree_t) - 1;
+       irec->ino_un.ex_data = NULL;
+       irec->nlinkops = &nlinkops[0];
+       irec->disk_nlinks = calloc(1, nlinkops[0].nlink_size);
+       if (!irec->disk_nlinks)
                do_error(_("could not allocate nlink array\n"));
-
-       return(ino_rec);
+       return irec;
 }
 
-/*
- * return inode record to free list, will be initialized when
- * it gets pulled off list
- */
 static void
-free_ino_tree_node(ino_tree_node_t *ino_rec)
+free_ino_tree_node(
+       struct ino_tree_node    *irec)
 {
-       ino_rec->avl_node.avl_nextino = NULL;
-       ino_rec->avl_node.avl_forw = NULL;
-       ino_rec->avl_node.avl_back = NULL;
-
-       pthread_mutex_lock(&ino_flist_lock);
-       if (ino_flist.list != NULL)  {
-               ASSERT(ino_flist.cnt > 0);
-               ino_rec->avl_node.avl_nextino = (avlnode_t *) ino_flist.list;
-       } else  {
-               ASSERT(ino_flist.cnt == 0);
-               ino_rec->avl_node.avl_nextino = NULL;
-       }
+       irec->avl_node.avl_nextino = NULL;
+       irec->avl_node.avl_forw = NULL;
+       irec->avl_node.avl_back = NULL;
 
-       ino_flist.list = ino_rec;
-       ino_flist.cnt++;
-
-       free(ino_rec->disk_nlinks);
-
-       if (ino_rec->ino_un.ex_data != NULL)  {
+       free(irec->disk_nlinks);
+       if (irec->ino_un.ex_data != NULL)  {
                if (full_ino_ex_data) {
-                       free(ino_rec->ino_un.ex_data->parents);
-                       free(ino_rec->ino_un.ex_data->counted_nlinks);
+                       free(irec->ino_un.ex_data->parents);
+                       free(irec->ino_un.ex_data->counted_nlinks);
                }
-               free(ino_rec->ino_un.ex_data);
+               free(irec->ino_un.ex_data);
 
        }
-       pthread_mutex_unlock(&ino_flist_lock);
+
+       free(irec);
 }
 
 /*
@@ -379,17 +327,15 @@
         * check to see if record containing inode is already in the tree.
         * if not, add it
         */
-       if ((ino_rec = (ino_tree_node_t *)
-                       avl_findrange(inode_uncertain_tree_ptrs[agno],
-                               s_ino)) == NULL)  {
-               ino_rec = mk_ino_tree_nodes(s_ino);
-               ino_rec->ino_startnum = s_ino;
-
-               if (avl_insert(inode_uncertain_tree_ptrs[agno],
-                               (avlnode_t *) ino_rec) == NULL)  {
-                       do_error(_("add_aginode_uncertain - "
-                                  "duplicate inode range\n"));
-               }
+       ino_rec = (ino_tree_node_t *)
+               avl_findrange(inode_uncertain_tree_ptrs[agno], s_ino);
+       if (!ino_rec) {
+               ino_rec = alloc_ino_node(s_ino);
+
+               if (!avl_insert(inode_uncertain_tree_ptrs[agno],
+                               &ino_rec->avl_node))
+                       do_error(
+       _("add_aginode_uncertain - duplicate inode range\n"));
        }
 
        if (free)
@@ -454,43 +400,38 @@
 
 
 /*
- * next comes the inode trees.  One per ag.  AVL trees
- * of inode records, each inode record tracking 64 inodes
+ * Next comes the inode trees.  One per AG,  AVL trees of inode records, each
+ * inode record tracking 64 inodes
  */
+
 /*
- * set up an inode tree record for a group of inodes that will
- * include the requested inode.
- *
- * does NOT error-check for duplicate records.  Caller is
- * responsible for checking that.
+ * Set up an inode tree record for a group of inodes that will include the
+ * requested inode.
  *
- * ino must be the start of an XFS_INODES_PER_CHUNK (64) inode chunk
+ * This does NOT do error-check for duplicate records.  The caller is
+ * responsible for checking that. Ino must be the start of an
+ * XFS_INODES_PER_CHUNK (64) inode chunk
  *
- * Each inode resides in a 64-inode chunk which can be part
- * one or more chunks (MAX(64, inodes-per-block).  The fs allocates
- * in chunks (as opposed to 1 chunk) when a block can hold more than
- * one chunk (inodes per block > 64).  Allocating in one chunk pieces
- * causes us problems when it takes more than one fs block to contain
- * an inode chunk because the chunks can start on *any* block boundary.
- * So we assume that the caller has a clue because at this level, we
- * don't.
- */
-static ino_tree_node_t *
-add_inode(struct xfs_mount *mp, xfs_agnumber_t agno, xfs_agino_t ino)
+ * Each inode resides in a 64-inode chunk which can be part one or more chunks
+ * (MAX(64, inodes-per-block).  The fs allocates in chunks (as opposed to 1
+ * chunk) when a block can hold more than one chunk (inodes per block > 64).
+ * Allocating in one chunk pieces causes us problems when it takes more than
+ * one fs block to contain an inode chunk because the chunks can start on
+ * *any* block boundary. So we assume that the caller has a clue because at
+ * this level, we don't.
+ */
+static struct ino_tree_node *
+add_inode(
+       struct xfs_mount        *mp,
+       xfs_agnumber_t          agno,
+       xfs_agino_t             agino)
 {
-       ino_tree_node_t *ino_rec;
-
-       /* no record exists, make some and put them into the tree */
-
-       ino_rec = mk_ino_tree_nodes(ino);
-       ino_rec->ino_startnum = ino;
+       struct ino_tree_node    *irec;
 
-       if (avl_insert(inode_tree_ptrs[agno],
-                       (avlnode_t *) ino_rec) == NULL)  {
+       irec = alloc_ino_node(agino);
+       if (!avl_insert(inode_tree_ptrs[agno],  &irec->avl_node))
                do_warn(_("add_inode - duplicate inode range\n"));
-       }
-
-       return(ino_rec);
+       return irec;
 }
 
 /*
@@ -816,7 +757,6 @@
        int i;
        int agcount = mp->m_sb.sb_agcount;
 
-       pthread_mutex_init(&ino_flist_lock, NULL);
        if ((inode_tree_ptrs = malloc(agcount *
                                        sizeof(avltree_desc_t *))) == NULL)
                do_error(_("couldn't malloc inode tree descriptor table\n"));
@@ -839,9 +779,6 @@
                avl_init_tree(inode_uncertain_tree_ptrs[i], &avl_ino_tree_ops);
        }
 
-       ino_flist.cnt = 0;
-       ino_flist.list = NULL;
-
        if ((last_rec = malloc(sizeof(ino_tree_node_t *) * agcount)) == NULL)
                do_error(_("couldn't malloc uncertain inode cache area\n"));
 

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