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@@ -0,0 +1,504 @@
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+/*
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+ * alloc.c - NILFS dat/inode allocator
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+ *
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+ * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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+ *
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+ * Original code was written by Koji Sato <koji@osrg.net>.
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+ * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>,
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+ * Amagai Yoshiji <amagai@osrg.net>.
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+ */
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+
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+#include <linux/types.h>
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+#include <linux/buffer_head.h>
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+#include <linux/fs.h>
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+#include <linux/bitops.h>
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+#include "mdt.h"
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+#include "alloc.h"
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+
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+
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+static inline unsigned long
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+nilfs_palloc_groups_per_desc_block(const struct inode *inode)
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+{
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+ return (1UL << inode->i_blkbits) /
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+ sizeof(struct nilfs_palloc_group_desc);
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+}
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+
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+static inline unsigned long
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+nilfs_palloc_groups_count(const struct inode *inode)
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+{
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+ return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */));
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+}
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+
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+int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned entry_size)
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+{
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+ struct nilfs_mdt_info *mi = NILFS_MDT(inode);
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+
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+ mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);
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+ if (!mi->mi_bgl)
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+ return -ENOMEM;
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+
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+ bgl_lock_init(mi->mi_bgl);
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+
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+ nilfs_mdt_set_entry_size(inode, entry_size, 0);
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+
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+ mi->mi_blocks_per_group =
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+ DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode),
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+ mi->mi_entries_per_block) + 1;
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+ /* Number of blocks in a group including entry blocks and
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+ a bitmap block */
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+ mi->mi_blocks_per_desc_block =
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+ nilfs_palloc_groups_per_desc_block(inode) *
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+ mi->mi_blocks_per_group + 1;
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+ /* Number of blocks per descriptor including the
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+ descriptor block */
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+ return 0;
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+}
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+
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+static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr,
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+ unsigned long *offset)
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+{
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+ __u64 group = nr;
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+
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+ *offset = do_div(group, nilfs_palloc_entries_per_group(inode));
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+ return group;
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+}
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+
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+static unsigned long
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+nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group)
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+{
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+ unsigned long desc_block =
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+ group / nilfs_palloc_groups_per_desc_block(inode);
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+ return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block;
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+}
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+
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+static unsigned long
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+nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group)
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+{
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+ unsigned long desc_offset =
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+ group % nilfs_palloc_groups_per_desc_block(inode);
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+ return nilfs_palloc_desc_blkoff(inode, group) + 1 +
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+ desc_offset * NILFS_MDT(inode)->mi_blocks_per_group;
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+}
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+
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+static unsigned long
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+nilfs_palloc_group_desc_nfrees(struct inode *inode, unsigned long group,
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+ const struct nilfs_palloc_group_desc *desc)
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+{
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+ unsigned long nfree;
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+
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+ spin_lock(nilfs_mdt_bgl_lock(inode, group));
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+ nfree = le32_to_cpu(desc->pg_nfrees);
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+ spin_unlock(nilfs_mdt_bgl_lock(inode, group));
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+ return nfree;
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+}
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+
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+static void
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+nilfs_palloc_group_desc_add_entries(struct inode *inode,
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+ unsigned long group,
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+ struct nilfs_palloc_group_desc *desc,
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+ u32 n)
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+{
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+ spin_lock(nilfs_mdt_bgl_lock(inode, group));
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+ le32_add_cpu(&desc->pg_nfrees, n);
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+ spin_unlock(nilfs_mdt_bgl_lock(inode, group));
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+}
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+
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+static unsigned long
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+nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr)
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+{
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+ unsigned long group, group_offset;
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+
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+ group = nilfs_palloc_group(inode, nr, &group_offset);
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+
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+ return nilfs_palloc_bitmap_blkoff(inode, group) + 1 +
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+ group_offset / NILFS_MDT(inode)->mi_entries_per_block;
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+}
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+
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+static void nilfs_palloc_desc_block_init(struct inode *inode,
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+ struct buffer_head *bh, void *kaddr)
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+{
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+ struct nilfs_palloc_group_desc *desc = kaddr + bh_offset(bh);
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+ unsigned long n = nilfs_palloc_groups_per_desc_block(inode);
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+ __le32 nfrees;
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+
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+ nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode));
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+ while (n-- > 0) {
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+ desc->pg_nfrees = nfrees;
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+ desc++;
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+ }
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+}
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+
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+static int nilfs_palloc_get_desc_block(struct inode *inode,
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+ unsigned long group,
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+ int create, struct buffer_head **bhp)
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+{
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+ return nilfs_mdt_get_block(inode,
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+ nilfs_palloc_desc_blkoff(inode, group),
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+ create, nilfs_palloc_desc_block_init, bhp);
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+}
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+
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+static int nilfs_palloc_get_bitmap_block(struct inode *inode,
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+ unsigned long group,
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+ int create, struct buffer_head **bhp)
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+{
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+ return nilfs_mdt_get_block(inode,
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+ nilfs_palloc_bitmap_blkoff(inode, group),
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+ create, NULL, bhp);
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+}
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+
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+int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr,
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+ int create, struct buffer_head **bhp)
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+{
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+ return nilfs_mdt_get_block(inode, nilfs_palloc_entry_blkoff(inode, nr),
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+ create, NULL, bhp);
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+}
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+
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+static struct nilfs_palloc_group_desc *
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+nilfs_palloc_block_get_group_desc(const struct inode *inode,
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+ unsigned long group,
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+ const struct buffer_head *bh, void *kaddr)
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+{
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+ return (struct nilfs_palloc_group_desc *)(kaddr + bh_offset(bh)) +
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+ group % nilfs_palloc_groups_per_desc_block(inode);
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+}
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+
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+static unsigned char *
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+nilfs_palloc_block_get_bitmap(const struct inode *inode,
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+ const struct buffer_head *bh, void *kaddr)
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+{
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+ return (unsigned char *)(kaddr + bh_offset(bh));
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+}
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+
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+void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr,
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+ const struct buffer_head *bh, void *kaddr)
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+{
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+ unsigned long entry_offset, group_offset;
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+
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+ nilfs_palloc_group(inode, nr, &group_offset);
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+ entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block;
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+
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+ return kaddr + bh_offset(bh) +
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+ entry_offset * NILFS_MDT(inode)->mi_entry_size;
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+}
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+
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+static int nilfs_palloc_find_available_slot(struct inode *inode,
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+ unsigned long group,
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+ unsigned long target,
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+ unsigned char *bitmap,
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+ int bsize) /* size in bits */
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+{
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+ int curr, pos, end, i;
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+
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+ if (target > 0) {
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+ end = (target + BITS_PER_LONG - 1) & ~(BITS_PER_LONG - 1);
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+ if (end > bsize)
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+ end = bsize;
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+ pos = nilfs_find_next_zero_bit(bitmap, end, target);
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+ if (pos < end &&
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+ !nilfs_set_bit_atomic(
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+ nilfs_mdt_bgl_lock(inode, group), pos, bitmap))
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+ return pos;
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+ } else
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+ end = 0;
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+
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+ for (i = 0, curr = end;
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+ i < bsize;
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+ i += BITS_PER_LONG, curr += BITS_PER_LONG) {
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+ /* wrap around */
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+ if (curr >= bsize)
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+ curr = 0;
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+ while (*((unsigned long *)bitmap + curr / BITS_PER_LONG)
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+ != ~0UL) {
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+ end = curr + BITS_PER_LONG;
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+ if (end > bsize)
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+ end = bsize;
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+ pos = nilfs_find_next_zero_bit(bitmap, end, curr);
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+ if ((pos < end) &&
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+ !nilfs_set_bit_atomic(
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+ nilfs_mdt_bgl_lock(inode, group), pos,
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+ bitmap))
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+ return pos;
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+ }
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+ }
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+ return -ENOSPC;
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+}
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+
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+static unsigned long
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+nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode,
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+ unsigned long curr, unsigned long max)
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+{
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+ return min_t(unsigned long,
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+ nilfs_palloc_groups_per_desc_block(inode) -
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+ curr % nilfs_palloc_groups_per_desc_block(inode),
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+ max - curr + 1);
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+}
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+
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+int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
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+ struct nilfs_palloc_req *req)
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+{
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+ struct buffer_head *desc_bh, *bitmap_bh;
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+ struct nilfs_palloc_group_desc *desc;
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+ unsigned char *bitmap;
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+ void *desc_kaddr, *bitmap_kaddr;
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+ unsigned long group, maxgroup, ngroups;
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+ unsigned long group_offset, maxgroup_offset;
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+ unsigned long n, entries_per_group, groups_per_desc_block;
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+ unsigned long i, j;
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+ int pos, ret;
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+
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+ ngroups = nilfs_palloc_groups_count(inode);
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+ maxgroup = ngroups - 1;
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+ group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
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+ entries_per_group = nilfs_palloc_entries_per_group(inode);
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+ groups_per_desc_block = nilfs_palloc_groups_per_desc_block(inode);
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+
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+ for (i = 0; i < ngroups; i += n) {
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+ if (group >= ngroups) {
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+ /* wrap around */
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+ group = 0;
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+ maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,
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+ &maxgroup_offset) - 1;
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+ }
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+ ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
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+ if (ret < 0)
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+ return ret;
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+ desc_kaddr = kmap(desc_bh->b_page);
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+ desc = nilfs_palloc_block_get_group_desc(
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+ inode, group, desc_bh, desc_kaddr);
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+ n = nilfs_palloc_rest_groups_in_desc_block(inode, group,
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+ maxgroup);
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+ for (j = 0; j < n; j++, desc++, group++) {
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+ if (nilfs_palloc_group_desc_nfrees(inode, group, desc)
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+ > 0) {
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+ ret = nilfs_palloc_get_bitmap_block(
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+ inode, group, 1, &bitmap_bh);
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+ if (ret < 0)
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+ goto out_desc;
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+ bitmap_kaddr = kmap(bitmap_bh->b_page);
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+ bitmap = nilfs_palloc_block_get_bitmap(
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+ inode, bitmap_bh, bitmap_kaddr);
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+ pos = nilfs_palloc_find_available_slot(
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+ inode, group, group_offset, bitmap,
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+ entries_per_group);
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+ if (pos >= 0) {
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+ /* found a free entry */
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+ nilfs_palloc_group_desc_add_entries(
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+ inode, group, desc, -1);
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+ req->pr_entry_nr =
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+ entries_per_group * group + pos;
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+ kunmap(desc_bh->b_page);
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+ kunmap(bitmap_bh->b_page);
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+
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+ req->pr_desc_bh = desc_bh;
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+ req->pr_bitmap_bh = bitmap_bh;
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+ return 0;
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+ }
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+ kunmap(bitmap_bh->b_page);
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+ brelse(bitmap_bh);
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+ }
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+
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+ group_offset = 0;
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+ }
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+
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+ kunmap(desc_bh->b_page);
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+ brelse(desc_bh);
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+ }
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+
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+ /* no entries left */
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+ return -ENOSPC;
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+
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+ out_desc:
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+ kunmap(desc_bh->b_page);
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+ brelse(desc_bh);
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+ return ret;
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+}
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+
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+void nilfs_palloc_commit_alloc_entry(struct inode *inode,
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+ struct nilfs_palloc_req *req)
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+{
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+ nilfs_mdt_mark_buffer_dirty(req->pr_bitmap_bh);
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+ nilfs_mdt_mark_buffer_dirty(req->pr_desc_bh);
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+ nilfs_mdt_mark_dirty(inode);
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+
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+ brelse(req->pr_bitmap_bh);
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+ brelse(req->pr_desc_bh);
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+}
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+
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+void nilfs_palloc_commit_free_entry(struct inode *inode,
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+ struct nilfs_palloc_req *req)
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+{
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+ struct nilfs_palloc_group_desc *desc;
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+ unsigned long group, group_offset;
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+ unsigned char *bitmap;
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+ void *desc_kaddr, *bitmap_kaddr;
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+
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+ group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
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+ desc_kaddr = kmap(req->pr_desc_bh->b_page);
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+ desc = nilfs_palloc_block_get_group_desc(inode, group,
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+ req->pr_desc_bh, desc_kaddr);
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+ bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
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+ bitmap = nilfs_palloc_block_get_bitmap(inode, req->pr_bitmap_bh,
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+ bitmap_kaddr);
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+
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+ if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
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+ group_offset, bitmap))
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+ printk(KERN_WARNING "%s: entry number %llu already freed\n",
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+ __func__, (unsigned long long)req->pr_entry_nr);
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+
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+ nilfs_palloc_group_desc_add_entries(inode, group, desc, 1);
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+
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+ kunmap(req->pr_bitmap_bh->b_page);
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+ kunmap(req->pr_desc_bh->b_page);
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+
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+ nilfs_mdt_mark_buffer_dirty(req->pr_desc_bh);
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+ nilfs_mdt_mark_buffer_dirty(req->pr_bitmap_bh);
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+ nilfs_mdt_mark_dirty(inode);
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+
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+ brelse(req->pr_bitmap_bh);
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+ brelse(req->pr_desc_bh);
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+}
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+
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+void nilfs_palloc_abort_alloc_entry(struct inode *inode,
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+ struct nilfs_palloc_req *req)
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+{
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+ struct nilfs_palloc_group_desc *desc;
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+ void *desc_kaddr, *bitmap_kaddr;
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+ unsigned char *bitmap;
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+ unsigned long group, group_offset;
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+
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+ group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
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+ desc_kaddr = kmap(req->pr_desc_bh->b_page);
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+ desc = nilfs_palloc_block_get_group_desc(inode, group,
|
|
|
+ req->pr_desc_bh, desc_kaddr);
|
|
|
+ bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
|
|
|
+ bitmap = nilfs_palloc_block_get_bitmap(inode, req->pr_bitmap_bh,
|
|
|
+ bitmap_kaddr);
|
|
|
+ if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
|
|
|
+ group_offset, bitmap))
|
|
|
+ printk(KERN_WARNING "%s: entry numer %llu already freed\n",
|
|
|
+ __func__, (unsigned long long)req->pr_entry_nr);
|
|
|
+
|
|
|
+ nilfs_palloc_group_desc_add_entries(inode, group, desc, 1);
|
|
|
+
|
|
|
+ kunmap(req->pr_bitmap_bh->b_page);
|
|
|
+ kunmap(req->pr_desc_bh->b_page);
|
|
|
+
|
|
|
+ brelse(req->pr_bitmap_bh);
|
|
|
+ brelse(req->pr_desc_bh);
|
|
|
+
|
|
|
+ req->pr_entry_nr = 0;
|
|
|
+ req->pr_bitmap_bh = NULL;
|
|
|
+ req->pr_desc_bh = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+int nilfs_palloc_prepare_free_entry(struct inode *inode,
|
|
|
+ struct nilfs_palloc_req *req)
|
|
|
+{
|
|
|
+ struct buffer_head *desc_bh, *bitmap_bh;
|
|
|
+ unsigned long group, group_offset;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
|
+ ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+ ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh);
|
|
|
+ if (ret < 0) {
|
|
|
+ brelse(desc_bh);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ req->pr_desc_bh = desc_bh;
|
|
|
+ req->pr_bitmap_bh = bitmap_bh;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+void nilfs_palloc_abort_free_entry(struct inode *inode,
|
|
|
+ struct nilfs_palloc_req *req)
|
|
|
+{
|
|
|
+ brelse(req->pr_bitmap_bh);
|
|
|
+ brelse(req->pr_desc_bh);
|
|
|
+
|
|
|
+ req->pr_entry_nr = 0;
|
|
|
+ req->pr_bitmap_bh = NULL;
|
|
|
+ req->pr_desc_bh = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+nilfs_palloc_group_is_in(struct inode *inode, unsigned long group, __u64 nr)
|
|
|
+{
|
|
|
+ __u64 first, last;
|
|
|
+
|
|
|
+ first = group * nilfs_palloc_entries_per_group(inode);
|
|
|
+ last = first + nilfs_palloc_entries_per_group(inode) - 1;
|
|
|
+ return (nr >= first) && (nr <= last);
|
|
|
+}
|
|
|
+
|
|
|
+int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
|
|
|
+{
|
|
|
+ struct buffer_head *desc_bh, *bitmap_bh;
|
|
|
+ struct nilfs_palloc_group_desc *desc;
|
|
|
+ unsigned char *bitmap;
|
|
|
+ void *desc_kaddr, *bitmap_kaddr;
|
|
|
+ unsigned long group, group_offset;
|
|
|
+ int i, j, n, ret;
|
|
|
+
|
|
|
+ for (i = 0; i < nitems; i += n) {
|
|
|
+ group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset);
|
|
|
+ ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+ ret = nilfs_palloc_get_bitmap_block(inode, group, 0,
|
|
|
+ &bitmap_bh);
|
|
|
+ if (ret < 0) {
|
|
|
+ brelse(desc_bh);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+ desc_kaddr = kmap(desc_bh->b_page);
|
|
|
+ desc = nilfs_palloc_block_get_group_desc(
|
|
|
+ inode, group, desc_bh, desc_kaddr);
|
|
|
+ bitmap_kaddr = kmap(bitmap_bh->b_page);
|
|
|
+ bitmap = nilfs_palloc_block_get_bitmap(
|
|
|
+ inode, bitmap_bh, bitmap_kaddr);
|
|
|
+ for (j = i, n = 0;
|
|
|
+ (j < nitems) && nilfs_palloc_group_is_in(inode, group,
|
|
|
+ entry_nrs[j]);
|
|
|
+ j++, n++) {
|
|
|
+ nilfs_palloc_group(inode, entry_nrs[j], &group_offset);
|
|
|
+ if (!nilfs_clear_bit_atomic(
|
|
|
+ nilfs_mdt_bgl_lock(inode, group),
|
|
|
+ group_offset, bitmap)) {
|
|
|
+ printk(KERN_WARNING
|
|
|
+ "%s: entry number %llu already freed\n",
|
|
|
+ __func__,
|
|
|
+ (unsigned long long)entry_nrs[j]);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ nilfs_palloc_group_desc_add_entries(inode, group, desc, n);
|
|
|
+
|
|
|
+ kunmap(bitmap_bh->b_page);
|
|
|
+ kunmap(desc_bh->b_page);
|
|
|
+
|
|
|
+ nilfs_mdt_mark_buffer_dirty(desc_bh);
|
|
|
+ nilfs_mdt_mark_buffer_dirty(bitmap_bh);
|
|
|
+ nilfs_mdt_mark_dirty(inode);
|
|
|
+
|
|
|
+ brelse(bitmap_bh);
|
|
|
+ brelse(desc_bh);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|