505 lines
14 KiB
C
505 lines
14 KiB
C
/*
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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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#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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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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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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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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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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bgl_lock_init(mi->mi_bgl);
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nilfs_mdt_set_entry_size(inode, entry_size, 0);
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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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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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*offset = do_div(group, nilfs_palloc_entries_per_group(inode));
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return group;
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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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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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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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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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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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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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group = nilfs_palloc_group(inode, nr, &group_offset);
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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group_offset = 0;
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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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/* no entries left */
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return -ENOSPC;
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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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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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brelse(req->pr_bitmap_bh);
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brelse(req->pr_desc_bh);
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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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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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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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nilfs_palloc_group_desc_add_entries(inode, group, desc, 1);
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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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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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brelse(req->pr_bitmap_bh);
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brelse(req->pr_desc_bh);
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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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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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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 numer %llu already freed\n",
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__func__, (unsigned long long)req->pr_entry_nr);
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nilfs_palloc_group_desc_add_entries(inode, group, desc, 1);
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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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brelse(req->pr_bitmap_bh);
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brelse(req->pr_desc_bh);
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req->pr_entry_nr = 0;
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req->pr_bitmap_bh = NULL;
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req->pr_desc_bh = NULL;
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}
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int nilfs_palloc_prepare_free_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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unsigned long group, group_offset;
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int ret;
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group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
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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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ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh);
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if (ret < 0) {
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brelse(desc_bh);
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return ret;
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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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void nilfs_palloc_abort_free_entry(struct inode *inode,
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struct nilfs_palloc_req *req)
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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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req->pr_entry_nr = 0;
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req->pr_bitmap_bh = NULL;
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req->pr_desc_bh = NULL;
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}
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static int
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nilfs_palloc_group_is_in(struct inode *inode, unsigned long group, __u64 nr)
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{
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__u64 first, last;
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first = group * nilfs_palloc_entries_per_group(inode);
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last = first + nilfs_palloc_entries_per_group(inode) - 1;
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return (nr >= first) && (nr <= last);
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}
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int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
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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, group_offset;
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int i, j, n, ret;
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for (i = 0; i < nitems; i += n) {
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group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset);
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ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh);
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if (ret < 0)
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return ret;
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ret = nilfs_palloc_get_bitmap_block(inode, group, 0,
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&bitmap_bh);
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if (ret < 0) {
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brelse(desc_bh);
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return ret;
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}
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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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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);
|
|
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;
|
|
}
|