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![Ryusuke Konishi](/assets/img/avatar_default.png)
Remove the verbose license text from NILFS2 files and replace them with SPDX tags. This does not change the license of any of the code. Link: http://lkml.kernel.org/r/1535624528-5982-1-git-send-email-konishi.ryusuke@lab.ntt.co.jp Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
862 lines
24 KiB
C
862 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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* Originally written by Koji Sato.
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* Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
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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 <linux/slab.h>
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#include "mdt.h"
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#include "alloc.h"
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/**
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* nilfs_palloc_groups_per_desc_block - get the number of groups that a group
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* descriptor block can maintain
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* @inode: inode of metadata file using this allocator
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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 i_blocksize(inode) /
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sizeof(struct nilfs_palloc_group_desc);
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}
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/**
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* nilfs_palloc_groups_count - get maximum number of groups
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* @inode: inode of metadata file using this allocator
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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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* nilfs_palloc_init_blockgroup - initialize private variables for allocator
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* @inode: inode of metadata file using this allocator
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* @entry_size: size of the persistent object
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*/
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int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned int 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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/*
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* Number of blocks in a group including entry blocks
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* and a bitmap block
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*/
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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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/*
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* Number of blocks per descriptor including the
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* descriptor block
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*/
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return 0;
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}
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/**
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* nilfs_palloc_group - get group number and offset from an entry number
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* @inode: inode of metadata file using this allocator
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* @nr: serial number of the entry (e.g. inode number)
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* @offset: pointer to store offset number in the group
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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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/**
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* nilfs_palloc_desc_blkoff - get block offset of a group descriptor block
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* @inode: inode of metadata file using this allocator
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* @group: group number
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*
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* nilfs_palloc_desc_blkoff() returns block offset of the descriptor
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* block which contains a descriptor of the specified 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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/**
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* nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block
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* @inode: inode of metadata file using this allocator
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* @group: group number
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*
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* nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap
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* block used to allocate/deallocate entries in the specified group.
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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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* nilfs_palloc_group_desc_nfrees - get the number of free entries in a group
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* @desc: pointer to descriptor structure for the group
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* @lock: spin lock protecting @desc
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*/
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static unsigned long
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nilfs_palloc_group_desc_nfrees(const struct nilfs_palloc_group_desc *desc,
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spinlock_t *lock)
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{
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unsigned long nfree;
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spin_lock(lock);
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nfree = le32_to_cpu(desc->pg_nfrees);
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spin_unlock(lock);
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return nfree;
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}
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/**
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* nilfs_palloc_group_desc_add_entries - adjust count of free entries
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* @desc: pointer to descriptor structure for the group
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* @lock: spin lock protecting @desc
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* @n: delta to be added
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*/
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static u32
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nilfs_palloc_group_desc_add_entries(struct nilfs_palloc_group_desc *desc,
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spinlock_t *lock, u32 n)
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{
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u32 nfree;
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spin_lock(lock);
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le32_add_cpu(&desc->pg_nfrees, n);
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nfree = le32_to_cpu(desc->pg_nfrees);
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spin_unlock(lock);
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return nfree;
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}
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/**
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* nilfs_palloc_entry_blkoff - get block offset of an entry block
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* @inode: inode of metadata file using this allocator
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* @nr: serial number of the entry (e.g. inode number)
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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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/**
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* nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block
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* @inode: inode of metadata file
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* @bh: buffer head of the buffer to be initialized
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* @kaddr: kernel address mapped for the page including the buffer
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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_block(struct inode *inode, unsigned long blkoff,
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int create,
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void (*init_block)(struct inode *,
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struct buffer_head *,
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void *),
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struct buffer_head **bhp,
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struct nilfs_bh_assoc *prev,
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spinlock_t *lock)
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{
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int ret;
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spin_lock(lock);
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if (prev->bh && blkoff == prev->blkoff) {
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get_bh(prev->bh);
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*bhp = prev->bh;
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spin_unlock(lock);
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return 0;
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}
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spin_unlock(lock);
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ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
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if (!ret) {
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spin_lock(lock);
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/*
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* The following code must be safe for change of the
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* cache contents during the get block call.
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*/
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brelse(prev->bh);
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get_bh(*bhp);
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prev->bh = *bhp;
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prev->blkoff = blkoff;
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spin_unlock(lock);
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}
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return ret;
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}
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/**
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* nilfs_palloc_delete_block - delete a block on the persistent allocator file
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* @inode: inode of metadata file using this allocator
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* @blkoff: block offset
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* @prev: nilfs_bh_assoc struct of the last used buffer
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* @lock: spin lock protecting @prev
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*/
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static int nilfs_palloc_delete_block(struct inode *inode, unsigned long blkoff,
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struct nilfs_bh_assoc *prev,
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spinlock_t *lock)
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{
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spin_lock(lock);
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if (prev->bh && blkoff == prev->blkoff) {
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brelse(prev->bh);
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prev->bh = NULL;
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}
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spin_unlock(lock);
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return nilfs_mdt_delete_block(inode, blkoff);
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}
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/**
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* nilfs_palloc_get_desc_block - get buffer head of a group descriptor block
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* @inode: inode of metadata file using this allocator
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* @group: group number
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* @create: create flag
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* @bhp: pointer to store the resultant buffer head
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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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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_get_block(inode,
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nilfs_palloc_desc_blkoff(inode, group),
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create, nilfs_palloc_desc_block_init,
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bhp, &cache->prev_desc, &cache->lock);
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}
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/**
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* nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block
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* @inode: inode of metadata file using this allocator
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* @group: group number
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* @create: create flag
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* @bhp: pointer to store the resultant buffer head
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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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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_get_block(inode,
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nilfs_palloc_bitmap_blkoff(inode, group),
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create, NULL, bhp,
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&cache->prev_bitmap, &cache->lock);
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}
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/**
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* nilfs_palloc_delete_bitmap_block - delete a bitmap block
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* @inode: inode of metadata file using this allocator
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* @group: group number
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*/
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static int nilfs_palloc_delete_bitmap_block(struct inode *inode,
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unsigned long group)
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{
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_delete_block(inode,
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nilfs_palloc_bitmap_blkoff(inode,
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group),
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&cache->prev_bitmap, &cache->lock);
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}
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/**
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* nilfs_palloc_get_entry_block - get buffer head of an entry block
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* @inode: inode of metadata file using this allocator
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* @nr: serial number of the entry (e.g. inode number)
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* @create: create flag
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* @bhp: pointer to store the resultant buffer head
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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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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_get_block(inode,
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nilfs_palloc_entry_blkoff(inode, nr),
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create, NULL, bhp,
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&cache->prev_entry, &cache->lock);
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}
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/**
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* nilfs_palloc_delete_entry_block - delete an entry block
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* @inode: inode of metadata file using this allocator
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* @nr: serial number of the entry
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*/
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static int nilfs_palloc_delete_entry_block(struct inode *inode, __u64 nr)
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{
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_delete_block(inode,
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nilfs_palloc_entry_blkoff(inode, nr),
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&cache->prev_entry, &cache->lock);
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}
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/**
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* nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor
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* @inode: inode of metadata file using this allocator
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* @group: group number
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* @bh: buffer head of the buffer storing the group descriptor block
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* @kaddr: kernel address mapped for the page including the buffer
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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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* nilfs_palloc_block_get_entry - get kernel address of an entry
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* @inode: inode of metadata file using this allocator
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* @nr: serial number of the entry (e.g. inode number)
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* @bh: buffer head of the buffer storing the entry block
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* @kaddr: kernel address mapped for the page including the buffer
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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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/**
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* nilfs_palloc_find_available_slot - find available slot in a group
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* @bitmap: bitmap of the group
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* @target: offset number of an entry in the group (start point)
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* @bsize: size in bits
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* @lock: spin lock protecting @bitmap
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*/
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static int nilfs_palloc_find_available_slot(unsigned char *bitmap,
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unsigned long target,
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unsigned int bsize,
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spinlock_t *lock)
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{
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int pos, end = bsize;
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if (likely(target < bsize)) {
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pos = target;
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do {
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pos = nilfs_find_next_zero_bit(bitmap, end, pos);
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if (pos >= end)
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break;
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if (!nilfs_set_bit_atomic(lock, pos, bitmap))
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return pos;
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} while (++pos < end);
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end = target;
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}
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/* wrap around */
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for (pos = 0; pos < end; pos++) {
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pos = nilfs_find_next_zero_bit(bitmap, end, pos);
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if (pos >= end)
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break;
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if (!nilfs_set_bit_atomic(lock, pos, bitmap))
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return pos;
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}
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return -ENOSPC;
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}
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/**
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* nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups
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* in a group descriptor block
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* @inode: inode of metadata file using this allocator
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* @curr: current group number
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* @max: maximum number of groups
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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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* nilfs_palloc_count_desc_blocks - count descriptor blocks number
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* @inode: inode of metadata file using this allocator
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* @desc_blocks: descriptor blocks number [out]
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*/
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static int nilfs_palloc_count_desc_blocks(struct inode *inode,
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unsigned long *desc_blocks)
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{
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__u64 blknum;
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int ret;
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ret = nilfs_bmap_last_key(NILFS_I(inode)->i_bmap, &blknum);
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if (likely(!ret))
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*desc_blocks = DIV_ROUND_UP(
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(unsigned long)blknum,
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NILFS_MDT(inode)->mi_blocks_per_desc_block);
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return ret;
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}
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/**
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* nilfs_palloc_mdt_file_can_grow - check potential opportunity for
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* MDT file growing
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* @inode: inode of metadata file using this allocator
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* @desc_blocks: known current descriptor blocks count
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*/
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static inline bool nilfs_palloc_mdt_file_can_grow(struct inode *inode,
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unsigned long desc_blocks)
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{
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return (nilfs_palloc_groups_per_desc_block(inode) * desc_blocks) <
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nilfs_palloc_groups_count(inode);
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}
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/**
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* nilfs_palloc_count_max_entries - count max number of entries that can be
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* described by descriptor blocks count
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* @inode: inode of metadata file using this allocator
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* @nused: current number of used entries
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* @nmaxp: max number of entries [out]
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*/
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int nilfs_palloc_count_max_entries(struct inode *inode, u64 nused, u64 *nmaxp)
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{
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unsigned long desc_blocks = 0;
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u64 entries_per_desc_block, nmax;
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int err;
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err = nilfs_palloc_count_desc_blocks(inode, &desc_blocks);
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if (unlikely(err))
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return err;
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entries_per_desc_block = (u64)nilfs_palloc_entries_per_group(inode) *
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nilfs_palloc_groups_per_desc_block(inode);
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nmax = entries_per_desc_block * desc_blocks;
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if (nused == nmax &&
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nilfs_palloc_mdt_file_can_grow(inode, desc_blocks))
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nmax += entries_per_desc_block;
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if (nused > nmax)
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return -ERANGE;
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*nmaxp = nmax;
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|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object
|
|
* @inode: inode of metadata file using this allocator
|
|
* @req: nilfs_palloc_req structure exchanged for the allocation
|
|
*/
|
|
int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
struct buffer_head *desc_bh, *bitmap_bh;
|
|
struct nilfs_palloc_group_desc *desc;
|
|
unsigned char *bitmap;
|
|
void *desc_kaddr, *bitmap_kaddr;
|
|
unsigned long group, maxgroup, ngroups;
|
|
unsigned long group_offset, maxgroup_offset;
|
|
unsigned long n, entries_per_group;
|
|
unsigned long i, j;
|
|
spinlock_t *lock;
|
|
int pos, ret;
|
|
|
|
ngroups = nilfs_palloc_groups_count(inode);
|
|
maxgroup = ngroups - 1;
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
entries_per_group = nilfs_palloc_entries_per_group(inode);
|
|
|
|
for (i = 0; i < ngroups; i += n) {
|
|
if (group >= ngroups) {
|
|
/* wrap around */
|
|
group = 0;
|
|
maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,
|
|
&maxgroup_offset) - 1;
|
|
}
|
|
ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
desc_kaddr = kmap(desc_bh->b_page);
|
|
desc = nilfs_palloc_block_get_group_desc(
|
|
inode, group, desc_bh, desc_kaddr);
|
|
n = nilfs_palloc_rest_groups_in_desc_block(inode, group,
|
|
maxgroup);
|
|
for (j = 0; j < n; j++, desc++, group++) {
|
|
lock = nilfs_mdt_bgl_lock(inode, group);
|
|
if (nilfs_palloc_group_desc_nfrees(desc, lock) > 0) {
|
|
ret = nilfs_palloc_get_bitmap_block(
|
|
inode, group, 1, &bitmap_bh);
|
|
if (ret < 0)
|
|
goto out_desc;
|
|
bitmap_kaddr = kmap(bitmap_bh->b_page);
|
|
bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
|
|
pos = nilfs_palloc_find_available_slot(
|
|
bitmap, group_offset,
|
|
entries_per_group, lock);
|
|
if (pos >= 0) {
|
|
/* found a free entry */
|
|
nilfs_palloc_group_desc_add_entries(
|
|
desc, lock, -1);
|
|
req->pr_entry_nr =
|
|
entries_per_group * group + pos;
|
|
kunmap(desc_bh->b_page);
|
|
kunmap(bitmap_bh->b_page);
|
|
|
|
req->pr_desc_bh = desc_bh;
|
|
req->pr_bitmap_bh = bitmap_bh;
|
|
return 0;
|
|
}
|
|
kunmap(bitmap_bh->b_page);
|
|
brelse(bitmap_bh);
|
|
}
|
|
|
|
group_offset = 0;
|
|
}
|
|
|
|
kunmap(desc_bh->b_page);
|
|
brelse(desc_bh);
|
|
}
|
|
|
|
/* no entries left */
|
|
return -ENOSPC;
|
|
|
|
out_desc:
|
|
kunmap(desc_bh->b_page);
|
|
brelse(desc_bh);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object
|
|
* @inode: inode of metadata file using this allocator
|
|
* @req: nilfs_palloc_req structure exchanged for the allocation
|
|
*/
|
|
void nilfs_palloc_commit_alloc_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
mark_buffer_dirty(req->pr_bitmap_bh);
|
|
mark_buffer_dirty(req->pr_desc_bh);
|
|
nilfs_mdt_mark_dirty(inode);
|
|
|
|
brelse(req->pr_bitmap_bh);
|
|
brelse(req->pr_desc_bh);
|
|
}
|
|
|
|
/**
|
|
* nilfs_palloc_commit_free_entry - finish deallocating a persistent object
|
|
* @inode: inode of metadata file using this allocator
|
|
* @req: nilfs_palloc_req structure exchanged for the removal
|
|
*/
|
|
void nilfs_palloc_commit_free_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
struct nilfs_palloc_group_desc *desc;
|
|
unsigned long group, group_offset;
|
|
unsigned char *bitmap;
|
|
void *desc_kaddr, *bitmap_kaddr;
|
|
spinlock_t *lock;
|
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
desc_kaddr = kmap(req->pr_desc_bh->b_page);
|
|
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 = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
|
|
lock = nilfs_mdt_bgl_lock(inode, group);
|
|
|
|
if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap))
|
|
nilfs_msg(inode->i_sb, KERN_WARNING,
|
|
"%s (ino=%lu): entry number %llu already freed",
|
|
__func__, inode->i_ino,
|
|
(unsigned long long)req->pr_entry_nr);
|
|
else
|
|
nilfs_palloc_group_desc_add_entries(desc, lock, 1);
|
|
|
|
kunmap(req->pr_bitmap_bh->b_page);
|
|
kunmap(req->pr_desc_bh->b_page);
|
|
|
|
mark_buffer_dirty(req->pr_desc_bh);
|
|
mark_buffer_dirty(req->pr_bitmap_bh);
|
|
nilfs_mdt_mark_dirty(inode);
|
|
|
|
brelse(req->pr_bitmap_bh);
|
|
brelse(req->pr_desc_bh);
|
|
}
|
|
|
|
/**
|
|
* nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object
|
|
* @inode: inode of metadata file using this allocator
|
|
* @req: nilfs_palloc_req structure exchanged for the allocation
|
|
*/
|
|
void nilfs_palloc_abort_alloc_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
struct nilfs_palloc_group_desc *desc;
|
|
void *desc_kaddr, *bitmap_kaddr;
|
|
unsigned char *bitmap;
|
|
unsigned long group, group_offset;
|
|
spinlock_t *lock;
|
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
desc_kaddr = kmap(req->pr_desc_bh->b_page);
|
|
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 = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
|
|
lock = nilfs_mdt_bgl_lock(inode, group);
|
|
|
|
if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap))
|
|
nilfs_msg(inode->i_sb, KERN_WARNING,
|
|
"%s (ino=%lu): entry number %llu already freed",
|
|
__func__, inode->i_ino,
|
|
(unsigned long long)req->pr_entry_nr);
|
|
else
|
|
nilfs_palloc_group_desc_add_entries(desc, lock, 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;
|
|
}
|
|
|
|
/**
|
|
* nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object
|
|
* @inode: inode of metadata file using this allocator
|
|
* @req: nilfs_palloc_req structure exchanged for the removal
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* nilfs_palloc_abort_free_entry - cancel deallocating a persistent object
|
|
* @inode: inode of metadata file using this allocator
|
|
* @req: nilfs_palloc_req structure exchanged for the removal
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* nilfs_palloc_freev - deallocate a set of persistent objects
|
|
* @inode: inode of metadata file using this allocator
|
|
* @entry_nrs: array of entry numbers to be deallocated
|
|
* @nitems: number of entries stored in @entry_nrs
|
|
*/
|
|
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;
|
|
__u64 group_min_nr, last_nrs[8];
|
|
const unsigned long epg = nilfs_palloc_entries_per_group(inode);
|
|
const unsigned int epb = NILFS_MDT(inode)->mi_entries_per_block;
|
|
unsigned int entry_start, end, pos;
|
|
spinlock_t *lock;
|
|
int i, j, k, ret;
|
|
u32 nfree;
|
|
|
|
for (i = 0; i < nitems; i = j) {
|
|
int change_group = false;
|
|
int nempties = 0, n = 0;
|
|
|
|
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;
|
|
}
|
|
|
|
/* Get the first entry number of the group */
|
|
group_min_nr = (__u64)group * epg;
|
|
|
|
bitmap_kaddr = kmap(bitmap_bh->b_page);
|
|
bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
|
|
lock = nilfs_mdt_bgl_lock(inode, group);
|
|
|
|
j = i;
|
|
entry_start = rounddown(group_offset, epb);
|
|
do {
|
|
if (!nilfs_clear_bit_atomic(lock, group_offset,
|
|
bitmap)) {
|
|
nilfs_msg(inode->i_sb, KERN_WARNING,
|
|
"%s (ino=%lu): entry number %llu already freed",
|
|
__func__, inode->i_ino,
|
|
(unsigned long long)entry_nrs[j]);
|
|
} else {
|
|
n++;
|
|
}
|
|
|
|
j++;
|
|
if (j >= nitems || entry_nrs[j] < group_min_nr ||
|
|
entry_nrs[j] >= group_min_nr + epg) {
|
|
change_group = true;
|
|
} else {
|
|
group_offset = entry_nrs[j] - group_min_nr;
|
|
if (group_offset >= entry_start &&
|
|
group_offset < entry_start + epb) {
|
|
/* This entry is in the same block */
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Test if the entry block is empty or not */
|
|
end = entry_start + epb;
|
|
pos = nilfs_find_next_bit(bitmap, end, entry_start);
|
|
if (pos >= end) {
|
|
last_nrs[nempties++] = entry_nrs[j - 1];
|
|
if (nempties >= ARRAY_SIZE(last_nrs))
|
|
break;
|
|
}
|
|
|
|
if (change_group)
|
|
break;
|
|
|
|
/* Go on to the next entry block */
|
|
entry_start = rounddown(group_offset, epb);
|
|
} while (true);
|
|
|
|
kunmap(bitmap_bh->b_page);
|
|
mark_buffer_dirty(bitmap_bh);
|
|
brelse(bitmap_bh);
|
|
|
|
for (k = 0; k < nempties; k++) {
|
|
ret = nilfs_palloc_delete_entry_block(inode,
|
|
last_nrs[k]);
|
|
if (ret && ret != -ENOENT)
|
|
nilfs_msg(inode->i_sb, KERN_WARNING,
|
|
"error %d deleting block that object (entry=%llu, ino=%lu) belongs to",
|
|
ret, (unsigned long long)last_nrs[k],
|
|
inode->i_ino);
|
|
}
|
|
|
|
desc_kaddr = kmap_atomic(desc_bh->b_page);
|
|
desc = nilfs_palloc_block_get_group_desc(
|
|
inode, group, desc_bh, desc_kaddr);
|
|
nfree = nilfs_palloc_group_desc_add_entries(desc, lock, n);
|
|
kunmap_atomic(desc_kaddr);
|
|
mark_buffer_dirty(desc_bh);
|
|
nilfs_mdt_mark_dirty(inode);
|
|
brelse(desc_bh);
|
|
|
|
if (nfree == nilfs_palloc_entries_per_group(inode)) {
|
|
ret = nilfs_palloc_delete_bitmap_block(inode, group);
|
|
if (ret && ret != -ENOENT)
|
|
nilfs_msg(inode->i_sb, KERN_WARNING,
|
|
"error %d deleting bitmap block of group=%lu, ino=%lu",
|
|
ret, group, inode->i_ino);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void nilfs_palloc_setup_cache(struct inode *inode,
|
|
struct nilfs_palloc_cache *cache)
|
|
{
|
|
NILFS_MDT(inode)->mi_palloc_cache = cache;
|
|
spin_lock_init(&cache->lock);
|
|
}
|
|
|
|
void nilfs_palloc_clear_cache(struct inode *inode)
|
|
{
|
|
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
|
|
|
|
spin_lock(&cache->lock);
|
|
brelse(cache->prev_desc.bh);
|
|
brelse(cache->prev_bitmap.bh);
|
|
brelse(cache->prev_entry.bh);
|
|
cache->prev_desc.bh = NULL;
|
|
cache->prev_bitmap.bh = NULL;
|
|
cache->prev_entry.bh = NULL;
|
|
spin_unlock(&cache->lock);
|
|
}
|
|
|
|
void nilfs_palloc_destroy_cache(struct inode *inode)
|
|
{
|
|
nilfs_palloc_clear_cache(inode);
|
|
NILFS_MDT(inode)->mi_palloc_cache = NULL;
|
|
}
|