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![Joseph Qi](/assets/img/avatar_default.png)
commit6f1b228529
introduces a regression which can deadlock as follows: Task1: Task2: jbd2_journal_commit_transaction ocfs2_test_bg_bit_allocatable spin_lock(&jh->b_state_lock) jbd_lock_bh_journal_head __jbd2_journal_remove_checkpoint spin_lock(&jh->b_state_lock) jbd2_journal_put_journal_head jbd_lock_bh_journal_head Task1 and Task2 lock bh->b_state and jh->b_state_lock in different order, which finally result in a deadlock. So use jbd2_journal_[grab|put]_journal_head instead in ocfs2_test_bg_bit_allocatable() to fix it. Link: https://lkml.kernel.org/r/20220121071205.100648-3-joseph.qi@linux.alibaba.com Fixes:6f1b228529
("ocfs2: fix race between searching chunks and release journal_head from buffer_head") Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com> Reported-by: Gautham Ananthakrishna <gautham.ananthakrishna@oracle.com> Tested-by: Gautham Ananthakrishna <gautham.ananthakrishna@oracle.com> Reported-by: Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Changwei Ge <gechangwei@live.cn> Cc: Gang He <ghe@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Jun Piao <piaojun@huawei.com> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2866 lines
75 KiB
C
2866 lines
75 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* suballoc.c
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*
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* metadata alloc and free
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* Inspired by ext3 block groups.
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "blockcheck.h"
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#include "dlmglue.h"
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#include "inode.h"
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#include "journal.h"
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#include "localalloc.h"
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#include "suballoc.h"
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#include "super.h"
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#include "sysfile.h"
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#include "uptodate.h"
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#include "ocfs2_trace.h"
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#include "buffer_head_io.h"
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#define NOT_ALLOC_NEW_GROUP 0
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#define ALLOC_NEW_GROUP 0x1
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#define ALLOC_GROUPS_FROM_GLOBAL 0x2
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#define OCFS2_MAX_TO_STEAL 1024
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struct ocfs2_suballoc_result {
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u64 sr_bg_blkno; /* The bg we allocated from. Set
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to 0 when a block group is
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contiguous. */
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u64 sr_bg_stable_blkno; /*
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* Doesn't change, always
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* set to target block
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* group descriptor
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* block.
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*/
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u64 sr_blkno; /* The first allocated block */
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unsigned int sr_bit_offset; /* The bit in the bg */
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unsigned int sr_bits; /* How many bits we claimed */
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};
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static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
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{
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if (res->sr_blkno == 0)
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return 0;
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if (res->sr_bg_blkno)
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return res->sr_bg_blkno;
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return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
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}
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static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
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static int ocfs2_block_group_fill(handle_t *handle,
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struct inode *alloc_inode,
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struct buffer_head *bg_bh,
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u64 group_blkno,
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unsigned int group_clusters,
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u16 my_chain,
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struct ocfs2_chain_list *cl);
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static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
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struct inode *alloc_inode,
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struct buffer_head *bh,
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u64 max_block,
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u64 *last_alloc_group,
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int flags);
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static int ocfs2_cluster_group_search(struct inode *inode,
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struct buffer_head *group_bh,
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u32 bits_wanted, u32 min_bits,
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u64 max_block,
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struct ocfs2_suballoc_result *res);
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static int ocfs2_block_group_search(struct inode *inode,
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struct buffer_head *group_bh,
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u32 bits_wanted, u32 min_bits,
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u64 max_block,
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struct ocfs2_suballoc_result *res);
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static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
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handle_t *handle,
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u32 bits_wanted,
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u32 min_bits,
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struct ocfs2_suballoc_result *res);
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static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
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int nr);
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static int ocfs2_relink_block_group(handle_t *handle,
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struct inode *alloc_inode,
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struct buffer_head *fe_bh,
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struct buffer_head *bg_bh,
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struct buffer_head *prev_bg_bh,
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u16 chain);
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static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
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u32 wanted);
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static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
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u64 bg_blkno,
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u16 bg_bit_off);
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static inline void ocfs2_block_to_cluster_group(struct inode *inode,
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u64 data_blkno,
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u64 *bg_blkno,
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u16 *bg_bit_off);
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static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
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u32 bits_wanted, u64 max_block,
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int flags,
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struct ocfs2_alloc_context **ac);
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void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
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{
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struct inode *inode = ac->ac_inode;
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if (inode) {
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if (ac->ac_which != OCFS2_AC_USE_LOCAL)
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ocfs2_inode_unlock(inode, 1);
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inode_unlock(inode);
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iput(inode);
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ac->ac_inode = NULL;
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}
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brelse(ac->ac_bh);
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ac->ac_bh = NULL;
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ac->ac_resv = NULL;
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kfree(ac->ac_find_loc_priv);
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ac->ac_find_loc_priv = NULL;
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}
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void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
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{
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ocfs2_free_ac_resource(ac);
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kfree(ac);
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}
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static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
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{
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return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
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}
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#define do_error(fmt, ...) \
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do { \
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if (resize) \
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mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
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else \
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return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
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} while (0)
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static int ocfs2_validate_gd_self(struct super_block *sb,
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struct buffer_head *bh,
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int resize)
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{
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struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
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if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
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do_error("Group descriptor #%llu has bad signature %.*s\n",
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(unsigned long long)bh->b_blocknr, 7,
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gd->bg_signature);
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}
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if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
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do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n",
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(unsigned long long)bh->b_blocknr,
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(unsigned long long)le64_to_cpu(gd->bg_blkno));
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}
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if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
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do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n",
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(unsigned long long)bh->b_blocknr,
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le32_to_cpu(gd->bg_generation));
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}
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if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
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do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n",
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(unsigned long long)bh->b_blocknr,
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le16_to_cpu(gd->bg_bits),
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le16_to_cpu(gd->bg_free_bits_count));
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}
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if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
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do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n",
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(unsigned long long)bh->b_blocknr,
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le16_to_cpu(gd->bg_bits),
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8 * le16_to_cpu(gd->bg_size));
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}
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return 0;
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}
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static int ocfs2_validate_gd_parent(struct super_block *sb,
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struct ocfs2_dinode *di,
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struct buffer_head *bh,
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int resize)
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{
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unsigned int max_bits;
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struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
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if (di->i_blkno != gd->bg_parent_dinode) {
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do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n",
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(unsigned long long)bh->b_blocknr,
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(unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
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(unsigned long long)le64_to_cpu(di->i_blkno));
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}
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max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
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if (le16_to_cpu(gd->bg_bits) > max_bits) {
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do_error("Group descriptor #%llu has bit count of %u\n",
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(unsigned long long)bh->b_blocknr,
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le16_to_cpu(gd->bg_bits));
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}
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/* In resize, we may meet the case bg_chain == cl_next_free_rec. */
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if ((le16_to_cpu(gd->bg_chain) >
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le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
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((le16_to_cpu(gd->bg_chain) ==
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le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
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do_error("Group descriptor #%llu has bad chain %u\n",
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(unsigned long long)bh->b_blocknr,
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le16_to_cpu(gd->bg_chain));
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}
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return 0;
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}
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#undef do_error
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/*
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* This version only prints errors. It does not fail the filesystem, and
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* exists only for resize.
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*/
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int ocfs2_check_group_descriptor(struct super_block *sb,
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struct ocfs2_dinode *di,
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struct buffer_head *bh)
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{
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int rc;
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struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
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BUG_ON(!buffer_uptodate(bh));
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/*
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* If the ecc fails, we return the error but otherwise
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* leave the filesystem running. We know any error is
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* local to this block.
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*/
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rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
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if (rc) {
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mlog(ML_ERROR,
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"Checksum failed for group descriptor %llu\n",
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(unsigned long long)bh->b_blocknr);
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} else
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rc = ocfs2_validate_gd_self(sb, bh, 1);
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if (!rc)
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rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
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return rc;
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}
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static int ocfs2_validate_group_descriptor(struct super_block *sb,
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struct buffer_head *bh)
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{
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int rc;
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struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
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trace_ocfs2_validate_group_descriptor(
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(unsigned long long)bh->b_blocknr);
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BUG_ON(!buffer_uptodate(bh));
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/*
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* If the ecc fails, we return the error but otherwise
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* leave the filesystem running. We know any error is
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* local to this block.
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*/
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rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
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if (rc)
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return rc;
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/*
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* Errors after here are fatal.
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*/
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return ocfs2_validate_gd_self(sb, bh, 0);
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}
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int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
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u64 gd_blkno, struct buffer_head **bh)
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{
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int rc;
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struct buffer_head *tmp = *bh;
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rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
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ocfs2_validate_group_descriptor);
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if (rc)
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goto out;
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rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
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if (rc) {
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brelse(tmp);
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goto out;
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}
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/* If ocfs2_read_block() got us a new bh, pass it up. */
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if (!*bh)
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*bh = tmp;
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out:
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return rc;
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}
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static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
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struct ocfs2_group_desc *bg,
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struct ocfs2_chain_list *cl,
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u64 p_blkno, unsigned int clusters)
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{
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struct ocfs2_extent_list *el = &bg->bg_list;
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struct ocfs2_extent_rec *rec;
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BUG_ON(!ocfs2_supports_discontig_bg(osb));
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if (!el->l_next_free_rec)
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el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
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rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
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rec->e_blkno = cpu_to_le64(p_blkno);
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rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
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le16_to_cpu(cl->cl_bpc));
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rec->e_leaf_clusters = cpu_to_le16(clusters);
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le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
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le16_add_cpu(&bg->bg_free_bits_count,
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clusters * le16_to_cpu(cl->cl_bpc));
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le16_add_cpu(&el->l_next_free_rec, 1);
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}
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static int ocfs2_block_group_fill(handle_t *handle,
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struct inode *alloc_inode,
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struct buffer_head *bg_bh,
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u64 group_blkno,
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unsigned int group_clusters,
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u16 my_chain,
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struct ocfs2_chain_list *cl)
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{
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int status = 0;
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struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
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struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
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struct super_block * sb = alloc_inode->i_sb;
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if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
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status = ocfs2_error(alloc_inode->i_sb,
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"group block (%llu) != b_blocknr (%llu)\n",
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(unsigned long long)group_blkno,
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(unsigned long long) bg_bh->b_blocknr);
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goto bail;
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}
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status = ocfs2_journal_access_gd(handle,
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INODE_CACHE(alloc_inode),
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bg_bh,
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OCFS2_JOURNAL_ACCESS_CREATE);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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memset(bg, 0, sb->s_blocksize);
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strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
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bg->bg_generation = cpu_to_le32(osb->fs_generation);
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bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
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osb->s_feature_incompat));
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bg->bg_chain = cpu_to_le16(my_chain);
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bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
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bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
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bg->bg_blkno = cpu_to_le64(group_blkno);
|
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if (group_clusters == le16_to_cpu(cl->cl_cpg))
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bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
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else
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ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
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group_clusters);
|
|
|
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/* set the 1st bit in the bitmap to account for the descriptor block */
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ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
|
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bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
|
|
|
|
ocfs2_journal_dirty(handle, bg_bh);
|
|
|
|
/* There is no need to zero out or otherwise initialize the
|
|
* other blocks in a group - All valid FS metadata in a block
|
|
* group stores the superblock fs_generation value at
|
|
* allocation time. */
|
|
|
|
bail:
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
|
|
{
|
|
u16 curr, best;
|
|
|
|
best = curr = 0;
|
|
while (curr < le16_to_cpu(cl->cl_count)) {
|
|
if (le32_to_cpu(cl->cl_recs[best].c_total) >
|
|
le32_to_cpu(cl->cl_recs[curr].c_total))
|
|
best = curr;
|
|
curr++;
|
|
}
|
|
return best;
|
|
}
|
|
|
|
static struct buffer_head *
|
|
ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct ocfs2_alloc_context *ac,
|
|
struct ocfs2_chain_list *cl)
|
|
{
|
|
int status;
|
|
u32 bit_off, num_bits;
|
|
u64 bg_blkno;
|
|
struct buffer_head *bg_bh;
|
|
unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
|
|
|
|
status = ocfs2_claim_clusters(handle, ac,
|
|
le16_to_cpu(cl->cl_cpg), &bit_off,
|
|
&num_bits);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* setup the group */
|
|
bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
|
|
trace_ocfs2_block_group_alloc_contig(
|
|
(unsigned long long)bg_blkno, alloc_rec);
|
|
|
|
bg_bh = sb_getblk(osb->sb, bg_blkno);
|
|
if (!bg_bh) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
|
|
|
|
status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
|
|
bg_blkno, num_bits, alloc_rec, cl);
|
|
if (status < 0) {
|
|
brelse(bg_bh);
|
|
mlog_errno(status);
|
|
}
|
|
|
|
bail:
|
|
return status ? ERR_PTR(status) : bg_bh;
|
|
}
|
|
|
|
static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct ocfs2_alloc_context *ac,
|
|
unsigned int min_bits,
|
|
u32 *bit_off, u32 *num_bits)
|
|
{
|
|
int status = 0;
|
|
|
|
while (min_bits) {
|
|
status = ocfs2_claim_clusters(handle, ac, min_bits,
|
|
bit_off, num_bits);
|
|
if (status != -ENOSPC)
|
|
break;
|
|
|
|
min_bits >>= 1;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_block_group_grow_discontig(handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct buffer_head *bg_bh,
|
|
struct ocfs2_alloc_context *ac,
|
|
struct ocfs2_chain_list *cl,
|
|
unsigned int min_bits)
|
|
{
|
|
int status;
|
|
struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
|
|
struct ocfs2_group_desc *bg =
|
|
(struct ocfs2_group_desc *)bg_bh->b_data;
|
|
unsigned int needed = le16_to_cpu(cl->cl_cpg) -
|
|
le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
|
|
u32 p_cpos, clusters;
|
|
u64 p_blkno;
|
|
struct ocfs2_extent_list *el = &bg->bg_list;
|
|
|
|
status = ocfs2_journal_access_gd(handle,
|
|
INODE_CACHE(alloc_inode),
|
|
bg_bh,
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
|
|
le16_to_cpu(el->l_count))) {
|
|
if (min_bits > needed)
|
|
min_bits = needed;
|
|
status = ocfs2_block_group_claim_bits(osb, handle, ac,
|
|
min_bits, &p_cpos,
|
|
&clusters);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
|
|
ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
|
|
clusters);
|
|
|
|
min_bits = clusters;
|
|
needed = le16_to_cpu(cl->cl_cpg) -
|
|
le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
|
|
}
|
|
|
|
if (needed > 0) {
|
|
/*
|
|
* We have used up all the extent rec but can't fill up
|
|
* the cpg. So bail out.
|
|
*/
|
|
status = -ENOSPC;
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_journal_dirty(handle, bg_bh);
|
|
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
static void ocfs2_bg_alloc_cleanup(handle_t *handle,
|
|
struct ocfs2_alloc_context *cluster_ac,
|
|
struct inode *alloc_inode,
|
|
struct buffer_head *bg_bh)
|
|
{
|
|
int i, ret;
|
|
struct ocfs2_group_desc *bg;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
if (!bg_bh)
|
|
return;
|
|
|
|
bg = (struct ocfs2_group_desc *)bg_bh->b_data;
|
|
el = &bg->bg_list;
|
|
for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
|
|
rec = &el->l_recs[i];
|
|
ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
|
|
cluster_ac->ac_bh,
|
|
le64_to_cpu(rec->e_blkno),
|
|
le16_to_cpu(rec->e_leaf_clusters));
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
/* Try all the clusters to free */
|
|
}
|
|
|
|
ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
|
|
brelse(bg_bh);
|
|
}
|
|
|
|
static struct buffer_head *
|
|
ocfs2_block_group_alloc_discontig(handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct ocfs2_alloc_context *ac,
|
|
struct ocfs2_chain_list *cl)
|
|
{
|
|
int status;
|
|
u32 bit_off, num_bits;
|
|
u64 bg_blkno;
|
|
unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
|
|
struct buffer_head *bg_bh = NULL;
|
|
unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
|
|
struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
|
|
|
|
if (!ocfs2_supports_discontig_bg(osb)) {
|
|
status = -ENOSPC;
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_extend_trans(handle,
|
|
ocfs2_calc_bg_discontig_credits(osb->sb));
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* We're going to be grabbing from multiple cluster groups.
|
|
* We don't have enough credits to relink them all, and the
|
|
* cluster groups will be staying in cache for the duration of
|
|
* this operation.
|
|
*/
|
|
ac->ac_disable_chain_relink = 1;
|
|
|
|
/* Claim the first region */
|
|
status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
|
|
&bit_off, &num_bits);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
min_bits = num_bits;
|
|
|
|
/* setup the group */
|
|
bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
|
|
trace_ocfs2_block_group_alloc_discontig(
|
|
(unsigned long long)bg_blkno, alloc_rec);
|
|
|
|
bg_bh = sb_getblk(osb->sb, bg_blkno);
|
|
if (!bg_bh) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
|
|
|
|
status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
|
|
bg_blkno, num_bits, alloc_rec, cl);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
|
|
bg_bh, ac, cl, min_bits);
|
|
if (status)
|
|
mlog_errno(status);
|
|
|
|
bail:
|
|
if (status)
|
|
ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
|
|
return status ? ERR_PTR(status) : bg_bh;
|
|
}
|
|
|
|
/*
|
|
* We expect the block group allocator to already be locked.
|
|
*/
|
|
static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
|
|
struct inode *alloc_inode,
|
|
struct buffer_head *bh,
|
|
u64 max_block,
|
|
u64 *last_alloc_group,
|
|
int flags)
|
|
{
|
|
int status, credits;
|
|
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
|
|
struct ocfs2_chain_list *cl;
|
|
struct ocfs2_alloc_context *ac = NULL;
|
|
handle_t *handle = NULL;
|
|
u16 alloc_rec;
|
|
struct buffer_head *bg_bh = NULL;
|
|
struct ocfs2_group_desc *bg;
|
|
|
|
BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
|
|
|
|
cl = &fe->id2.i_chain;
|
|
status = ocfs2_reserve_clusters_with_limit(osb,
|
|
le16_to_cpu(cl->cl_cpg),
|
|
max_block, flags, &ac);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
credits = ocfs2_calc_group_alloc_credits(osb->sb,
|
|
le16_to_cpu(cl->cl_cpg));
|
|
handle = ocfs2_start_trans(osb, credits);
|
|
if (IS_ERR(handle)) {
|
|
status = PTR_ERR(handle);
|
|
handle = NULL;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (last_alloc_group && *last_alloc_group != 0) {
|
|
trace_ocfs2_block_group_alloc(
|
|
(unsigned long long)*last_alloc_group);
|
|
ac->ac_last_group = *last_alloc_group;
|
|
}
|
|
|
|
bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
|
|
ac, cl);
|
|
if (PTR_ERR(bg_bh) == -ENOSPC)
|
|
bg_bh = ocfs2_block_group_alloc_discontig(handle,
|
|
alloc_inode,
|
|
ac, cl);
|
|
if (IS_ERR(bg_bh)) {
|
|
status = PTR_ERR(bg_bh);
|
|
bg_bh = NULL;
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
bg = (struct ocfs2_group_desc *) bg_bh->b_data;
|
|
|
|
status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
|
|
bh, OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
alloc_rec = le16_to_cpu(bg->bg_chain);
|
|
le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
|
|
le16_to_cpu(bg->bg_free_bits_count));
|
|
le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
|
|
le16_to_cpu(bg->bg_bits));
|
|
cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
|
|
if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
|
|
le16_add_cpu(&cl->cl_next_free_rec, 1);
|
|
|
|
le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
|
|
le16_to_cpu(bg->bg_free_bits_count));
|
|
le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
|
|
le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
|
|
|
|
ocfs2_journal_dirty(handle, bh);
|
|
|
|
spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
|
|
OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
|
|
fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
|
|
le32_to_cpu(fe->i_clusters)));
|
|
spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
|
|
i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
|
|
alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
|
|
ocfs2_update_inode_fsync_trans(handle, alloc_inode, 0);
|
|
|
|
status = 0;
|
|
|
|
/* save the new last alloc group so that the caller can cache it. */
|
|
if (last_alloc_group)
|
|
*last_alloc_group = ac->ac_last_group;
|
|
|
|
bail:
|
|
if (handle)
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
if (ac)
|
|
ocfs2_free_alloc_context(ac);
|
|
|
|
brelse(bg_bh);
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
|
|
struct ocfs2_alloc_context *ac,
|
|
int type,
|
|
u32 slot,
|
|
u64 *last_alloc_group,
|
|
int flags)
|
|
{
|
|
int status;
|
|
u32 bits_wanted = ac->ac_bits_wanted;
|
|
struct inode *alloc_inode;
|
|
struct buffer_head *bh = NULL;
|
|
struct ocfs2_dinode *fe;
|
|
u32 free_bits;
|
|
|
|
alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
|
|
if (!alloc_inode) {
|
|
mlog_errno(-EINVAL);
|
|
return -EINVAL;
|
|
}
|
|
|
|
inode_lock(alloc_inode);
|
|
|
|
status = ocfs2_inode_lock(alloc_inode, &bh, 1);
|
|
if (status < 0) {
|
|
inode_unlock(alloc_inode);
|
|
iput(alloc_inode);
|
|
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
ac->ac_inode = alloc_inode;
|
|
ac->ac_alloc_slot = slot;
|
|
|
|
fe = (struct ocfs2_dinode *) bh->b_data;
|
|
|
|
/* The bh was validated by the inode read inside
|
|
* ocfs2_inode_lock(). Any corruption is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
|
|
|
|
if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
|
|
status = ocfs2_error(alloc_inode->i_sb,
|
|
"Invalid chain allocator %llu\n",
|
|
(unsigned long long)le64_to_cpu(fe->i_blkno));
|
|
goto bail;
|
|
}
|
|
|
|
free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
|
|
le32_to_cpu(fe->id1.bitmap1.i_used);
|
|
|
|
if (bits_wanted > free_bits) {
|
|
/* cluster bitmap never grows */
|
|
if (ocfs2_is_cluster_bitmap(alloc_inode)) {
|
|
trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
|
|
free_bits);
|
|
status = -ENOSPC;
|
|
goto bail;
|
|
}
|
|
|
|
if (!(flags & ALLOC_NEW_GROUP)) {
|
|
trace_ocfs2_reserve_suballoc_bits_no_new_group(
|
|
slot, bits_wanted, free_bits);
|
|
status = -ENOSPC;
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
|
|
ac->ac_max_block,
|
|
last_alloc_group, flags);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
atomic_inc(&osb->alloc_stats.bg_extends);
|
|
|
|
/* You should never ask for this much metadata */
|
|
BUG_ON(bits_wanted >
|
|
(le32_to_cpu(fe->id1.bitmap1.i_total)
|
|
- le32_to_cpu(fe->id1.bitmap1.i_used)));
|
|
}
|
|
|
|
get_bh(bh);
|
|
ac->ac_bh = bh;
|
|
bail:
|
|
brelse(bh);
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
|
|
{
|
|
spin_lock(&osb->osb_lock);
|
|
osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
|
|
spin_unlock(&osb->osb_lock);
|
|
atomic_set(&osb->s_num_inodes_stolen, 0);
|
|
}
|
|
|
|
static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
|
|
{
|
|
spin_lock(&osb->osb_lock);
|
|
osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
|
|
spin_unlock(&osb->osb_lock);
|
|
atomic_set(&osb->s_num_meta_stolen, 0);
|
|
}
|
|
|
|
void ocfs2_init_steal_slots(struct ocfs2_super *osb)
|
|
{
|
|
ocfs2_init_inode_steal_slot(osb);
|
|
ocfs2_init_meta_steal_slot(osb);
|
|
}
|
|
|
|
static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
|
|
{
|
|
spin_lock(&osb->osb_lock);
|
|
if (type == INODE_ALLOC_SYSTEM_INODE)
|
|
osb->s_inode_steal_slot = (u16)slot;
|
|
else if (type == EXTENT_ALLOC_SYSTEM_INODE)
|
|
osb->s_meta_steal_slot = (u16)slot;
|
|
spin_unlock(&osb->osb_lock);
|
|
}
|
|
|
|
static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
|
|
{
|
|
int slot = OCFS2_INVALID_SLOT;
|
|
|
|
spin_lock(&osb->osb_lock);
|
|
if (type == INODE_ALLOC_SYSTEM_INODE)
|
|
slot = osb->s_inode_steal_slot;
|
|
else if (type == EXTENT_ALLOC_SYSTEM_INODE)
|
|
slot = osb->s_meta_steal_slot;
|
|
spin_unlock(&osb->osb_lock);
|
|
|
|
return slot;
|
|
}
|
|
|
|
static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
|
|
{
|
|
return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
|
|
}
|
|
|
|
static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
|
|
{
|
|
return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
|
|
}
|
|
|
|
static int ocfs2_steal_resource(struct ocfs2_super *osb,
|
|
struct ocfs2_alloc_context *ac,
|
|
int type)
|
|
{
|
|
int i, status = -ENOSPC;
|
|
int slot = __ocfs2_get_steal_slot(osb, type);
|
|
|
|
/* Start to steal resource from the first slot after ours. */
|
|
if (slot == OCFS2_INVALID_SLOT)
|
|
slot = osb->slot_num + 1;
|
|
|
|
for (i = 0; i < osb->max_slots; i++, slot++) {
|
|
if (slot == osb->max_slots)
|
|
slot = 0;
|
|
|
|
if (slot == osb->slot_num)
|
|
continue;
|
|
|
|
status = ocfs2_reserve_suballoc_bits(osb, ac,
|
|
type,
|
|
(u32)slot, NULL,
|
|
NOT_ALLOC_NEW_GROUP);
|
|
if (status >= 0) {
|
|
__ocfs2_set_steal_slot(osb, slot, type);
|
|
break;
|
|
}
|
|
|
|
ocfs2_free_ac_resource(ac);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_steal_inode(struct ocfs2_super *osb,
|
|
struct ocfs2_alloc_context *ac)
|
|
{
|
|
return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
|
|
}
|
|
|
|
static int ocfs2_steal_meta(struct ocfs2_super *osb,
|
|
struct ocfs2_alloc_context *ac)
|
|
{
|
|
return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
|
|
}
|
|
|
|
int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
|
|
int blocks,
|
|
struct ocfs2_alloc_context **ac)
|
|
{
|
|
int status;
|
|
int slot = ocfs2_get_meta_steal_slot(osb);
|
|
|
|
*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
|
|
if (!(*ac)) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
(*ac)->ac_bits_wanted = blocks;
|
|
(*ac)->ac_which = OCFS2_AC_USE_META;
|
|
(*ac)->ac_group_search = ocfs2_block_group_search;
|
|
|
|
if (slot != OCFS2_INVALID_SLOT &&
|
|
atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
|
|
goto extent_steal;
|
|
|
|
atomic_set(&osb->s_num_meta_stolen, 0);
|
|
status = ocfs2_reserve_suballoc_bits(osb, (*ac),
|
|
EXTENT_ALLOC_SYSTEM_INODE,
|
|
(u32)osb->slot_num, NULL,
|
|
ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
|
|
|
|
|
|
if (status >= 0) {
|
|
status = 0;
|
|
if (slot != OCFS2_INVALID_SLOT)
|
|
ocfs2_init_meta_steal_slot(osb);
|
|
goto bail;
|
|
} else if (status < 0 && status != -ENOSPC) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_free_ac_resource(*ac);
|
|
|
|
extent_steal:
|
|
status = ocfs2_steal_meta(osb, *ac);
|
|
atomic_inc(&osb->s_num_meta_stolen);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = 0;
|
|
bail:
|
|
if ((status < 0) && *ac) {
|
|
ocfs2_free_alloc_context(*ac);
|
|
*ac = NULL;
|
|
}
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
|
|
struct ocfs2_extent_list *root_el,
|
|
struct ocfs2_alloc_context **ac)
|
|
{
|
|
return ocfs2_reserve_new_metadata_blocks(osb,
|
|
ocfs2_extend_meta_needed(root_el),
|
|
ac);
|
|
}
|
|
|
|
int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
|
|
struct ocfs2_alloc_context **ac)
|
|
{
|
|
int status;
|
|
int slot = ocfs2_get_inode_steal_slot(osb);
|
|
u64 alloc_group;
|
|
|
|
*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
|
|
if (!(*ac)) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
(*ac)->ac_bits_wanted = 1;
|
|
(*ac)->ac_which = OCFS2_AC_USE_INODE;
|
|
|
|
(*ac)->ac_group_search = ocfs2_block_group_search;
|
|
|
|
/*
|
|
* stat(2) can't handle i_ino > 32bits, so we tell the
|
|
* lower levels not to allocate us a block group past that
|
|
* limit. The 'inode64' mount option avoids this behavior.
|
|
*/
|
|
if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
|
|
(*ac)->ac_max_block = (u32)~0U;
|
|
|
|
/*
|
|
* slot is set when we successfully steal inode from other nodes.
|
|
* It is reset in 3 places:
|
|
* 1. when we flush the truncate log
|
|
* 2. when we complete local alloc recovery.
|
|
* 3. when we successfully allocate from our own slot.
|
|
* After it is set, we will go on stealing inodes until we find the
|
|
* need to check our slots to see whether there is some space for us.
|
|
*/
|
|
if (slot != OCFS2_INVALID_SLOT &&
|
|
atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
|
|
goto inode_steal;
|
|
|
|
atomic_set(&osb->s_num_inodes_stolen, 0);
|
|
alloc_group = osb->osb_inode_alloc_group;
|
|
status = ocfs2_reserve_suballoc_bits(osb, *ac,
|
|
INODE_ALLOC_SYSTEM_INODE,
|
|
(u32)osb->slot_num,
|
|
&alloc_group,
|
|
ALLOC_NEW_GROUP |
|
|
ALLOC_GROUPS_FROM_GLOBAL);
|
|
if (status >= 0) {
|
|
status = 0;
|
|
|
|
spin_lock(&osb->osb_lock);
|
|
osb->osb_inode_alloc_group = alloc_group;
|
|
spin_unlock(&osb->osb_lock);
|
|
trace_ocfs2_reserve_new_inode_new_group(
|
|
(unsigned long long)alloc_group);
|
|
|
|
/*
|
|
* Some inodes must be freed by us, so try to allocate
|
|
* from our own next time.
|
|
*/
|
|
if (slot != OCFS2_INVALID_SLOT)
|
|
ocfs2_init_inode_steal_slot(osb);
|
|
goto bail;
|
|
} else if (status < 0 && status != -ENOSPC) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_free_ac_resource(*ac);
|
|
|
|
inode_steal:
|
|
status = ocfs2_steal_inode(osb, *ac);
|
|
atomic_inc(&osb->s_num_inodes_stolen);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = 0;
|
|
bail:
|
|
if ((status < 0) && *ac) {
|
|
ocfs2_free_alloc_context(*ac);
|
|
*ac = NULL;
|
|
}
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
/* local alloc code has to do the same thing, so rather than do this
|
|
* twice.. */
|
|
int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
|
|
struct ocfs2_alloc_context *ac)
|
|
{
|
|
int status;
|
|
|
|
ac->ac_which = OCFS2_AC_USE_MAIN;
|
|
ac->ac_group_search = ocfs2_cluster_group_search;
|
|
|
|
status = ocfs2_reserve_suballoc_bits(osb, ac,
|
|
GLOBAL_BITMAP_SYSTEM_INODE,
|
|
OCFS2_INVALID_SLOT, NULL,
|
|
ALLOC_NEW_GROUP);
|
|
if (status < 0 && status != -ENOSPC)
|
|
mlog_errno(status);
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Callers don't need to care which bitmap (local alloc or main) to
|
|
* use so we figure it out for them, but unfortunately this clutters
|
|
* things a bit. */
|
|
static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
|
|
u32 bits_wanted, u64 max_block,
|
|
int flags,
|
|
struct ocfs2_alloc_context **ac)
|
|
{
|
|
int status, ret = 0;
|
|
int retried = 0;
|
|
|
|
*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
|
|
if (!(*ac)) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
(*ac)->ac_bits_wanted = bits_wanted;
|
|
(*ac)->ac_max_block = max_block;
|
|
|
|
status = -ENOSPC;
|
|
if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
|
|
ocfs2_alloc_should_use_local(osb, bits_wanted)) {
|
|
status = ocfs2_reserve_local_alloc_bits(osb,
|
|
bits_wanted,
|
|
*ac);
|
|
if ((status < 0) && (status != -ENOSPC)) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
if (status == -ENOSPC) {
|
|
retry:
|
|
status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
|
|
/* Retry if there is sufficient space cached in truncate log */
|
|
if (status == -ENOSPC && !retried) {
|
|
retried = 1;
|
|
ocfs2_inode_unlock((*ac)->ac_inode, 1);
|
|
inode_unlock((*ac)->ac_inode);
|
|
|
|
ret = ocfs2_try_to_free_truncate_log(osb, bits_wanted);
|
|
if (ret == 1) {
|
|
iput((*ac)->ac_inode);
|
|
(*ac)->ac_inode = NULL;
|
|
goto retry;
|
|
}
|
|
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
|
|
inode_lock((*ac)->ac_inode);
|
|
ret = ocfs2_inode_lock((*ac)->ac_inode, NULL, 1);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
inode_unlock((*ac)->ac_inode);
|
|
iput((*ac)->ac_inode);
|
|
(*ac)->ac_inode = NULL;
|
|
goto bail;
|
|
}
|
|
}
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
status = 0;
|
|
bail:
|
|
if ((status < 0) && *ac) {
|
|
ocfs2_free_alloc_context(*ac);
|
|
*ac = NULL;
|
|
}
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_reserve_clusters(struct ocfs2_super *osb,
|
|
u32 bits_wanted,
|
|
struct ocfs2_alloc_context **ac)
|
|
{
|
|
return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
|
|
ALLOC_NEW_GROUP, ac);
|
|
}
|
|
|
|
/*
|
|
* More or less lifted from ext3. I'll leave their description below:
|
|
*
|
|
* "For ext3 allocations, we must not reuse any blocks which are
|
|
* allocated in the bitmap buffer's "last committed data" copy. This
|
|
* prevents deletes from freeing up the page for reuse until we have
|
|
* committed the delete transaction.
|
|
*
|
|
* If we didn't do this, then deleting something and reallocating it as
|
|
* data would allow the old block to be overwritten before the
|
|
* transaction committed (because we force data to disk before commit).
|
|
* This would lead to corruption if we crashed between overwriting the
|
|
* data and committing the delete.
|
|
*
|
|
* @@@ We may want to make this allocation behaviour conditional on
|
|
* data-writes at some point, and disable it for metadata allocations or
|
|
* sync-data inodes."
|
|
*
|
|
* Note: OCFS2 already does this differently for metadata vs data
|
|
* allocations, as those bitmaps are separate and undo access is never
|
|
* called on a metadata group descriptor.
|
|
*/
|
|
static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
|
|
int nr)
|
|
{
|
|
struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
|
|
struct journal_head *jh;
|
|
int ret;
|
|
|
|
if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
|
|
return 0;
|
|
|
|
jh = jbd2_journal_grab_journal_head(bg_bh);
|
|
if (!jh)
|
|
return 1;
|
|
|
|
spin_lock(&jh->b_state_lock);
|
|
bg = (struct ocfs2_group_desc *) jh->b_committed_data;
|
|
if (bg)
|
|
ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
|
|
else
|
|
ret = 1;
|
|
spin_unlock(&jh->b_state_lock);
|
|
jbd2_journal_put_journal_head(jh);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
|
|
struct buffer_head *bg_bh,
|
|
unsigned int bits_wanted,
|
|
unsigned int total_bits,
|
|
struct ocfs2_suballoc_result *res)
|
|
{
|
|
void *bitmap;
|
|
u16 best_offset, best_size;
|
|
int offset, start, found, status = 0;
|
|
struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
|
|
|
|
/* Callers got this descriptor from
|
|
* ocfs2_read_group_descriptor(). Any corruption is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
|
|
|
|
found = start = best_offset = best_size = 0;
|
|
bitmap = bg->bg_bitmap;
|
|
|
|
while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
|
|
if (offset == total_bits)
|
|
break;
|
|
|
|
if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
|
|
/* We found a zero, but we can't use it as it
|
|
* hasn't been put to disk yet! */
|
|
found = 0;
|
|
start = offset + 1;
|
|
} else if (offset == start) {
|
|
/* we found a zero */
|
|
found++;
|
|
/* move start to the next bit to test */
|
|
start++;
|
|
} else {
|
|
/* got a zero after some ones */
|
|
found = 1;
|
|
start = offset + 1;
|
|
}
|
|
if (found > best_size) {
|
|
best_size = found;
|
|
best_offset = start - found;
|
|
}
|
|
/* we got everything we needed */
|
|
if (found == bits_wanted) {
|
|
/* mlog(0, "Found it all!\n"); */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (best_size) {
|
|
res->sr_bit_offset = best_offset;
|
|
res->sr_bits = best_size;
|
|
} else {
|
|
status = -ENOSPC;
|
|
/* No error log here -- see the comment above
|
|
* ocfs2_test_bg_bit_allocatable */
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_block_group_set_bits(handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct ocfs2_group_desc *bg,
|
|
struct buffer_head *group_bh,
|
|
unsigned int bit_off,
|
|
unsigned int num_bits)
|
|
{
|
|
int status;
|
|
void *bitmap = bg->bg_bitmap;
|
|
int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
|
|
|
|
/* All callers get the descriptor via
|
|
* ocfs2_read_group_descriptor(). Any corruption is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
|
|
BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
|
|
|
|
trace_ocfs2_block_group_set_bits(bit_off, num_bits);
|
|
|
|
if (ocfs2_is_cluster_bitmap(alloc_inode))
|
|
journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
|
|
|
|
status = ocfs2_journal_access_gd(handle,
|
|
INODE_CACHE(alloc_inode),
|
|
group_bh,
|
|
journal_type);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
|
|
if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
|
|
return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
|
|
(unsigned long long)le64_to_cpu(bg->bg_blkno),
|
|
le16_to_cpu(bg->bg_bits),
|
|
le16_to_cpu(bg->bg_free_bits_count),
|
|
num_bits);
|
|
}
|
|
while(num_bits--)
|
|
ocfs2_set_bit(bit_off++, bitmap);
|
|
|
|
ocfs2_journal_dirty(handle, group_bh);
|
|
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
/* find the one with the most empty bits */
|
|
static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
|
|
{
|
|
u16 curr, best;
|
|
|
|
BUG_ON(!cl->cl_next_free_rec);
|
|
|
|
best = curr = 0;
|
|
while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
|
|
if (le32_to_cpu(cl->cl_recs[curr].c_free) >
|
|
le32_to_cpu(cl->cl_recs[best].c_free))
|
|
best = curr;
|
|
curr++;
|
|
}
|
|
|
|
BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
|
|
return best;
|
|
}
|
|
|
|
static int ocfs2_relink_block_group(handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct buffer_head *fe_bh,
|
|
struct buffer_head *bg_bh,
|
|
struct buffer_head *prev_bg_bh,
|
|
u16 chain)
|
|
{
|
|
int status;
|
|
/* there is a really tiny chance the journal calls could fail,
|
|
* but we wouldn't want inconsistent blocks in *any* case. */
|
|
u64 bg_ptr, prev_bg_ptr;
|
|
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
|
|
struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
|
|
struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
|
|
|
|
/* The caller got these descriptors from
|
|
* ocfs2_read_group_descriptor(). Any corruption is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
|
|
BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
|
|
|
|
trace_ocfs2_relink_block_group(
|
|
(unsigned long long)le64_to_cpu(fe->i_blkno), chain,
|
|
(unsigned long long)le64_to_cpu(bg->bg_blkno),
|
|
(unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
|
|
|
|
bg_ptr = le64_to_cpu(bg->bg_next_group);
|
|
prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
|
|
|
|
status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
|
|
prev_bg_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0)
|
|
goto out;
|
|
|
|
prev_bg->bg_next_group = bg->bg_next_group;
|
|
ocfs2_journal_dirty(handle, prev_bg_bh);
|
|
|
|
status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
|
|
bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0)
|
|
goto out_rollback_prev_bg;
|
|
|
|
bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
|
|
ocfs2_journal_dirty(handle, bg_bh);
|
|
|
|
status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
|
|
fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0)
|
|
goto out_rollback_bg;
|
|
|
|
fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
|
|
ocfs2_journal_dirty(handle, fe_bh);
|
|
|
|
out:
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
return status;
|
|
|
|
out_rollback_bg:
|
|
bg->bg_next_group = cpu_to_le64(bg_ptr);
|
|
out_rollback_prev_bg:
|
|
prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
|
|
goto out;
|
|
}
|
|
|
|
static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
|
|
u32 wanted)
|
|
{
|
|
return le16_to_cpu(bg->bg_free_bits_count) > wanted;
|
|
}
|
|
|
|
/* return 0 on success, -ENOSPC to keep searching and any other < 0
|
|
* value on error. */
|
|
static int ocfs2_cluster_group_search(struct inode *inode,
|
|
struct buffer_head *group_bh,
|
|
u32 bits_wanted, u32 min_bits,
|
|
u64 max_block,
|
|
struct ocfs2_suballoc_result *res)
|
|
{
|
|
int search = -ENOSPC;
|
|
int ret;
|
|
u64 blkoff;
|
|
struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
unsigned int max_bits, gd_cluster_off;
|
|
|
|
BUG_ON(!ocfs2_is_cluster_bitmap(inode));
|
|
|
|
if (gd->bg_free_bits_count) {
|
|
max_bits = le16_to_cpu(gd->bg_bits);
|
|
|
|
/* Tail groups in cluster bitmaps which aren't cpg
|
|
* aligned are prone to partial extension by a failed
|
|
* fs resize. If the file system resize never got to
|
|
* update the dinode cluster count, then we don't want
|
|
* to trust any clusters past it, regardless of what
|
|
* the group descriptor says. */
|
|
gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
|
|
le64_to_cpu(gd->bg_blkno));
|
|
if ((gd_cluster_off + max_bits) >
|
|
OCFS2_I(inode)->ip_clusters) {
|
|
max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
|
|
trace_ocfs2_cluster_group_search_wrong_max_bits(
|
|
(unsigned long long)le64_to_cpu(gd->bg_blkno),
|
|
le16_to_cpu(gd->bg_bits),
|
|
OCFS2_I(inode)->ip_clusters, max_bits);
|
|
}
|
|
|
|
ret = ocfs2_block_group_find_clear_bits(osb,
|
|
group_bh, bits_wanted,
|
|
max_bits, res);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (max_block) {
|
|
blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
|
|
gd_cluster_off +
|
|
res->sr_bit_offset +
|
|
res->sr_bits);
|
|
trace_ocfs2_cluster_group_search_max_block(
|
|
(unsigned long long)blkoff,
|
|
(unsigned long long)max_block);
|
|
if (blkoff > max_block)
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/* ocfs2_block_group_find_clear_bits() might
|
|
* return success, but we still want to return
|
|
* -ENOSPC unless it found the minimum number
|
|
* of bits. */
|
|
if (min_bits <= res->sr_bits)
|
|
search = 0; /* success */
|
|
else if (res->sr_bits) {
|
|
/*
|
|
* Don't show bits which we'll be returning
|
|
* for allocation to the local alloc bitmap.
|
|
*/
|
|
ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
|
|
}
|
|
}
|
|
|
|
return search;
|
|
}
|
|
|
|
static int ocfs2_block_group_search(struct inode *inode,
|
|
struct buffer_head *group_bh,
|
|
u32 bits_wanted, u32 min_bits,
|
|
u64 max_block,
|
|
struct ocfs2_suballoc_result *res)
|
|
{
|
|
int ret = -ENOSPC;
|
|
u64 blkoff;
|
|
struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
|
|
|
|
BUG_ON(min_bits != 1);
|
|
BUG_ON(ocfs2_is_cluster_bitmap(inode));
|
|
|
|
if (bg->bg_free_bits_count) {
|
|
ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
|
|
group_bh, bits_wanted,
|
|
le16_to_cpu(bg->bg_bits),
|
|
res);
|
|
if (!ret && max_block) {
|
|
blkoff = le64_to_cpu(bg->bg_blkno) +
|
|
res->sr_bit_offset + res->sr_bits;
|
|
trace_ocfs2_block_group_search_max_block(
|
|
(unsigned long long)blkoff,
|
|
(unsigned long long)max_block);
|
|
if (blkoff > max_block)
|
|
ret = -ENOSPC;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_alloc_dinode_update_counts(struct inode *inode,
|
|
handle_t *handle,
|
|
struct buffer_head *di_bh,
|
|
u32 num_bits,
|
|
u16 chain)
|
|
{
|
|
int ret;
|
|
u32 tmp_used;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
|
|
struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
|
|
|
|
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
|
|
di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
|
|
le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
|
|
ocfs2_journal_dirty(handle, di_bh);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
|
|
struct buffer_head *di_bh,
|
|
u32 num_bits,
|
|
u16 chain)
|
|
{
|
|
u32 tmp_used;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
|
|
struct ocfs2_chain_list *cl;
|
|
|
|
cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
|
|
tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
|
|
di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
|
|
le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
|
|
}
|
|
|
|
static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
|
|
struct ocfs2_extent_rec *rec,
|
|
struct ocfs2_chain_list *cl)
|
|
{
|
|
unsigned int bpc = le16_to_cpu(cl->cl_bpc);
|
|
unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
|
|
unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc;
|
|
|
|
if (res->sr_bit_offset < bitoff)
|
|
return 0;
|
|
if (res->sr_bit_offset >= (bitoff + bitcount))
|
|
return 0;
|
|
res->sr_blkno = le64_to_cpu(rec->e_blkno) +
|
|
(res->sr_bit_offset - bitoff);
|
|
if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
|
|
res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
|
|
return 1;
|
|
}
|
|
|
|
static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
|
|
struct ocfs2_group_desc *bg,
|
|
struct ocfs2_suballoc_result *res)
|
|
{
|
|
int i;
|
|
u64 bg_blkno = res->sr_bg_blkno; /* Save off */
|
|
struct ocfs2_extent_rec *rec;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
|
|
struct ocfs2_chain_list *cl = &di->id2.i_chain;
|
|
|
|
if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
|
|
res->sr_blkno = 0;
|
|
return;
|
|
}
|
|
|
|
res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
|
|
res->sr_bg_blkno = 0; /* Clear it for contig block groups */
|
|
if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
|
|
!bg->bg_list.l_next_free_rec)
|
|
return;
|
|
|
|
for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
|
|
rec = &bg->bg_list.l_recs[i];
|
|
if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
|
|
res->sr_bg_blkno = bg_blkno; /* Restore */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
|
|
handle_t *handle,
|
|
u32 bits_wanted,
|
|
u32 min_bits,
|
|
struct ocfs2_suballoc_result *res,
|
|
u16 *bits_left)
|
|
{
|
|
int ret;
|
|
struct buffer_head *group_bh = NULL;
|
|
struct ocfs2_group_desc *gd;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
|
|
struct inode *alloc_inode = ac->ac_inode;
|
|
|
|
ret = ocfs2_read_group_descriptor(alloc_inode, di,
|
|
res->sr_bg_blkno, &group_bh);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
return ret;
|
|
}
|
|
|
|
gd = (struct ocfs2_group_desc *) group_bh->b_data;
|
|
ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
|
|
ac->ac_max_block, res);
|
|
if (ret < 0) {
|
|
if (ret != -ENOSPC)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (!ret)
|
|
ocfs2_bg_discontig_fix_result(ac, gd, res);
|
|
|
|
/*
|
|
* sr_bg_blkno might have been changed by
|
|
* ocfs2_bg_discontig_fix_result
|
|
*/
|
|
res->sr_bg_stable_blkno = group_bh->b_blocknr;
|
|
|
|
if (ac->ac_find_loc_only)
|
|
goto out_loc_only;
|
|
|
|
ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
|
|
res->sr_bits,
|
|
le16_to_cpu(gd->bg_chain));
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
|
|
res->sr_bit_offset, res->sr_bits);
|
|
if (ret < 0) {
|
|
ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
|
|
res->sr_bits,
|
|
le16_to_cpu(gd->bg_chain));
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
out_loc_only:
|
|
*bits_left = le16_to_cpu(gd->bg_free_bits_count);
|
|
|
|
out:
|
|
brelse(group_bh);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
|
|
handle_t *handle,
|
|
u32 bits_wanted,
|
|
u32 min_bits,
|
|
struct ocfs2_suballoc_result *res,
|
|
u16 *bits_left)
|
|
{
|
|
int status;
|
|
u16 chain;
|
|
u64 next_group;
|
|
struct inode *alloc_inode = ac->ac_inode;
|
|
struct buffer_head *group_bh = NULL;
|
|
struct buffer_head *prev_group_bh = NULL;
|
|
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
|
|
struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
|
|
struct ocfs2_group_desc *bg;
|
|
|
|
chain = ac->ac_chain;
|
|
trace_ocfs2_search_chain_begin(
|
|
(unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
|
|
bits_wanted, chain);
|
|
|
|
status = ocfs2_read_group_descriptor(alloc_inode, fe,
|
|
le64_to_cpu(cl->cl_recs[chain].c_blkno),
|
|
&group_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
bg = (struct ocfs2_group_desc *) group_bh->b_data;
|
|
|
|
status = -ENOSPC;
|
|
/* for now, the chain search is a bit simplistic. We just use
|
|
* the 1st group with any empty bits. */
|
|
while ((status = ac->ac_group_search(alloc_inode, group_bh,
|
|
bits_wanted, min_bits,
|
|
ac->ac_max_block,
|
|
res)) == -ENOSPC) {
|
|
if (!bg->bg_next_group)
|
|
break;
|
|
|
|
brelse(prev_group_bh);
|
|
prev_group_bh = NULL;
|
|
|
|
next_group = le64_to_cpu(bg->bg_next_group);
|
|
prev_group_bh = group_bh;
|
|
group_bh = NULL;
|
|
status = ocfs2_read_group_descriptor(alloc_inode, fe,
|
|
next_group, &group_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
bg = (struct ocfs2_group_desc *) group_bh->b_data;
|
|
}
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
trace_ocfs2_search_chain_succ(
|
|
(unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
|
|
|
|
res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
|
|
|
|
BUG_ON(res->sr_bits == 0);
|
|
if (!status)
|
|
ocfs2_bg_discontig_fix_result(ac, bg, res);
|
|
|
|
/*
|
|
* sr_bg_blkno might have been changed by
|
|
* ocfs2_bg_discontig_fix_result
|
|
*/
|
|
res->sr_bg_stable_blkno = group_bh->b_blocknr;
|
|
|
|
/*
|
|
* Keep track of previous block descriptor read. When
|
|
* we find a target, if we have read more than X
|
|
* number of descriptors, and the target is reasonably
|
|
* empty, relink him to top of his chain.
|
|
*
|
|
* We've read 0 extra blocks and only send one more to
|
|
* the transaction, yet the next guy to search has a
|
|
* much easier time.
|
|
*
|
|
* Do this *after* figuring out how many bits we're taking out
|
|
* of our target group.
|
|
*/
|
|
if (!ac->ac_disable_chain_relink &&
|
|
(prev_group_bh) &&
|
|
(ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
|
|
status = ocfs2_relink_block_group(handle, alloc_inode,
|
|
ac->ac_bh, group_bh,
|
|
prev_group_bh, chain);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
if (ac->ac_find_loc_only)
|
|
goto out_loc_only;
|
|
|
|
status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
|
|
ac->ac_bh, res->sr_bits,
|
|
chain);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_block_group_set_bits(handle,
|
|
alloc_inode,
|
|
bg,
|
|
group_bh,
|
|
res->sr_bit_offset,
|
|
res->sr_bits);
|
|
if (status < 0) {
|
|
ocfs2_rollback_alloc_dinode_counts(alloc_inode,
|
|
ac->ac_bh, res->sr_bits, chain);
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
trace_ocfs2_search_chain_end(
|
|
(unsigned long long)le64_to_cpu(fe->i_blkno),
|
|
res->sr_bits);
|
|
|
|
out_loc_only:
|
|
*bits_left = le16_to_cpu(bg->bg_free_bits_count);
|
|
bail:
|
|
brelse(group_bh);
|
|
brelse(prev_group_bh);
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
/* will give out up to bits_wanted contiguous bits. */
|
|
static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
|
|
handle_t *handle,
|
|
u32 bits_wanted,
|
|
u32 min_bits,
|
|
struct ocfs2_suballoc_result *res)
|
|
{
|
|
int status;
|
|
u16 victim, i;
|
|
u16 bits_left = 0;
|
|
u64 hint = ac->ac_last_group;
|
|
struct ocfs2_chain_list *cl;
|
|
struct ocfs2_dinode *fe;
|
|
|
|
BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
|
|
BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
|
|
BUG_ON(!ac->ac_bh);
|
|
|
|
fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
|
|
|
|
/* The bh was validated by the inode read during
|
|
* ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
|
|
|
|
if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
|
|
le32_to_cpu(fe->id1.bitmap1.i_total)) {
|
|
status = ocfs2_error(ac->ac_inode->i_sb,
|
|
"Chain allocator dinode %llu has %u used bits but only %u total\n",
|
|
(unsigned long long)le64_to_cpu(fe->i_blkno),
|
|
le32_to_cpu(fe->id1.bitmap1.i_used),
|
|
le32_to_cpu(fe->id1.bitmap1.i_total));
|
|
goto bail;
|
|
}
|
|
|
|
res->sr_bg_blkno = hint;
|
|
if (res->sr_bg_blkno) {
|
|
/* Attempt to short-circuit the usual search mechanism
|
|
* by jumping straight to the most recently used
|
|
* allocation group. This helps us maintain some
|
|
* contiguousness across allocations. */
|
|
status = ocfs2_search_one_group(ac, handle, bits_wanted,
|
|
min_bits, res, &bits_left);
|
|
if (!status)
|
|
goto set_hint;
|
|
if (status < 0 && status != -ENOSPC) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
|
|
|
|
victim = ocfs2_find_victim_chain(cl);
|
|
ac->ac_chain = victim;
|
|
|
|
status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
|
|
res, &bits_left);
|
|
if (!status) {
|
|
if (ocfs2_is_cluster_bitmap(ac->ac_inode))
|
|
hint = res->sr_bg_blkno;
|
|
else
|
|
hint = ocfs2_group_from_res(res);
|
|
goto set_hint;
|
|
}
|
|
if (status < 0 && status != -ENOSPC) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
trace_ocfs2_claim_suballoc_bits(victim);
|
|
|
|
/* If we didn't pick a good victim, then just default to
|
|
* searching each chain in order. Don't allow chain relinking
|
|
* because we only calculate enough journal credits for one
|
|
* relink per alloc. */
|
|
ac->ac_disable_chain_relink = 1;
|
|
for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
|
|
if (i == victim)
|
|
continue;
|
|
if (!cl->cl_recs[i].c_free)
|
|
continue;
|
|
|
|
ac->ac_chain = i;
|
|
status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
|
|
res, &bits_left);
|
|
if (!status) {
|
|
hint = ocfs2_group_from_res(res);
|
|
break;
|
|
}
|
|
if (status < 0 && status != -ENOSPC) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
set_hint:
|
|
if (status != -ENOSPC) {
|
|
/* If the next search of this group is not likely to
|
|
* yield a suitable extent, then we reset the last
|
|
* group hint so as to not waste a disk read */
|
|
if (bits_left < min_bits)
|
|
ac->ac_last_group = 0;
|
|
else
|
|
ac->ac_last_group = hint;
|
|
}
|
|
|
|
bail:
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_claim_metadata(handle_t *handle,
|
|
struct ocfs2_alloc_context *ac,
|
|
u32 bits_wanted,
|
|
u64 *suballoc_loc,
|
|
u16 *suballoc_bit_start,
|
|
unsigned int *num_bits,
|
|
u64 *blkno_start)
|
|
{
|
|
int status;
|
|
struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
|
|
|
|
BUG_ON(!ac);
|
|
BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
|
|
BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
|
|
|
|
status = ocfs2_claim_suballoc_bits(ac,
|
|
handle,
|
|
bits_wanted,
|
|
1,
|
|
&res);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
|
|
|
|
*suballoc_loc = res.sr_bg_blkno;
|
|
*suballoc_bit_start = res.sr_bit_offset;
|
|
*blkno_start = res.sr_blkno;
|
|
ac->ac_bits_given += res.sr_bits;
|
|
*num_bits = res.sr_bits;
|
|
status = 0;
|
|
bail:
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
static void ocfs2_init_inode_ac_group(struct inode *dir,
|
|
struct buffer_head *parent_di_bh,
|
|
struct ocfs2_alloc_context *ac)
|
|
{
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
|
|
/*
|
|
* Try to allocate inodes from some specific group.
|
|
*
|
|
* If the parent dir has recorded the last group used in allocation,
|
|
* cool, use it. Otherwise if we try to allocate new inode from the
|
|
* same slot the parent dir belongs to, use the same chunk.
|
|
*
|
|
* We are very careful here to avoid the mistake of setting
|
|
* ac_last_group to a group descriptor from a different (unlocked) slot.
|
|
*/
|
|
if (OCFS2_I(dir)->ip_last_used_group &&
|
|
OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
|
|
ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
|
|
else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
|
|
if (di->i_suballoc_loc)
|
|
ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
|
|
else
|
|
ac->ac_last_group = ocfs2_which_suballoc_group(
|
|
le64_to_cpu(di->i_blkno),
|
|
le16_to_cpu(di->i_suballoc_bit));
|
|
}
|
|
}
|
|
|
|
static inline void ocfs2_save_inode_ac_group(struct inode *dir,
|
|
struct ocfs2_alloc_context *ac)
|
|
{
|
|
OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
|
|
OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
|
|
}
|
|
|
|
int ocfs2_find_new_inode_loc(struct inode *dir,
|
|
struct buffer_head *parent_fe_bh,
|
|
struct ocfs2_alloc_context *ac,
|
|
u64 *fe_blkno)
|
|
{
|
|
int ret;
|
|
handle_t *handle = NULL;
|
|
struct ocfs2_suballoc_result *res;
|
|
|
|
BUG_ON(!ac);
|
|
BUG_ON(ac->ac_bits_given != 0);
|
|
BUG_ON(ac->ac_bits_wanted != 1);
|
|
BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
|
|
|
|
res = kzalloc(sizeof(*res), GFP_NOFS);
|
|
if (res == NULL) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
|
|
|
|
/*
|
|
* The handle started here is for chain relink. Alternatively,
|
|
* we could just disable relink for these calls.
|
|
*/
|
|
handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
handle = NULL;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* This will instruct ocfs2_claim_suballoc_bits and
|
|
* ocfs2_search_one_group to search but save actual allocation
|
|
* for later.
|
|
*/
|
|
ac->ac_find_loc_only = 1;
|
|
|
|
ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ac->ac_find_loc_priv = res;
|
|
*fe_blkno = res->sr_blkno;
|
|
ocfs2_update_inode_fsync_trans(handle, dir, 0);
|
|
out:
|
|
if (handle)
|
|
ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
|
|
|
|
if (ret)
|
|
kfree(res);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_claim_new_inode_at_loc(handle_t *handle,
|
|
struct inode *dir,
|
|
struct ocfs2_alloc_context *ac,
|
|
u64 *suballoc_loc,
|
|
u16 *suballoc_bit,
|
|
u64 di_blkno)
|
|
{
|
|
int ret;
|
|
u16 chain;
|
|
struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
|
|
struct buffer_head *bg_bh = NULL;
|
|
struct ocfs2_group_desc *bg;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
|
|
|
|
/*
|
|
* Since di_blkno is being passed back in, we check for any
|
|
* inconsistencies which may have happened between
|
|
* calls. These are code bugs as di_blkno is not expected to
|
|
* change once returned from ocfs2_find_new_inode_loc()
|
|
*/
|
|
BUG_ON(res->sr_blkno != di_blkno);
|
|
|
|
ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
|
|
res->sr_bg_stable_blkno, &bg_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
bg = (struct ocfs2_group_desc *) bg_bh->b_data;
|
|
chain = le16_to_cpu(bg->bg_chain);
|
|
|
|
ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
|
|
ac->ac_bh, res->sr_bits,
|
|
chain);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_block_group_set_bits(handle,
|
|
ac->ac_inode,
|
|
bg,
|
|
bg_bh,
|
|
res->sr_bit_offset,
|
|
res->sr_bits);
|
|
if (ret < 0) {
|
|
ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
|
|
ac->ac_bh, res->sr_bits, chain);
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
|
|
res->sr_bits);
|
|
|
|
atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
|
|
|
|
BUG_ON(res->sr_bits != 1);
|
|
|
|
*suballoc_loc = res->sr_bg_blkno;
|
|
*suballoc_bit = res->sr_bit_offset;
|
|
ac->ac_bits_given++;
|
|
ocfs2_save_inode_ac_group(dir, ac);
|
|
|
|
out:
|
|
brelse(bg_bh);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_claim_new_inode(handle_t *handle,
|
|
struct inode *dir,
|
|
struct buffer_head *parent_fe_bh,
|
|
struct ocfs2_alloc_context *ac,
|
|
u64 *suballoc_loc,
|
|
u16 *suballoc_bit,
|
|
u64 *fe_blkno)
|
|
{
|
|
int status;
|
|
struct ocfs2_suballoc_result res;
|
|
|
|
BUG_ON(!ac);
|
|
BUG_ON(ac->ac_bits_given != 0);
|
|
BUG_ON(ac->ac_bits_wanted != 1);
|
|
BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
|
|
|
|
ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
|
|
|
|
status = ocfs2_claim_suballoc_bits(ac,
|
|
handle,
|
|
1,
|
|
1,
|
|
&res);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
|
|
|
|
BUG_ON(res.sr_bits != 1);
|
|
|
|
*suballoc_loc = res.sr_bg_blkno;
|
|
*suballoc_bit = res.sr_bit_offset;
|
|
*fe_blkno = res.sr_blkno;
|
|
ac->ac_bits_given++;
|
|
ocfs2_save_inode_ac_group(dir, ac);
|
|
status = 0;
|
|
bail:
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
/* translate a group desc. blkno and it's bitmap offset into
|
|
* disk cluster offset. */
|
|
static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
|
|
u64 bg_blkno,
|
|
u16 bg_bit_off)
|
|
{
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
u32 cluster = 0;
|
|
|
|
BUG_ON(!ocfs2_is_cluster_bitmap(inode));
|
|
|
|
if (bg_blkno != osb->first_cluster_group_blkno)
|
|
cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
|
|
cluster += (u32) bg_bit_off;
|
|
return cluster;
|
|
}
|
|
|
|
/* given a cluster offset, calculate which block group it belongs to
|
|
* and return that block offset. */
|
|
u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
|
|
{
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
u32 group_no;
|
|
|
|
BUG_ON(!ocfs2_is_cluster_bitmap(inode));
|
|
|
|
group_no = cluster / osb->bitmap_cpg;
|
|
if (!group_no)
|
|
return osb->first_cluster_group_blkno;
|
|
return ocfs2_clusters_to_blocks(inode->i_sb,
|
|
group_no * osb->bitmap_cpg);
|
|
}
|
|
|
|
/* given the block number of a cluster start, calculate which cluster
|
|
* group and descriptor bitmap offset that corresponds to. */
|
|
static inline void ocfs2_block_to_cluster_group(struct inode *inode,
|
|
u64 data_blkno,
|
|
u64 *bg_blkno,
|
|
u16 *bg_bit_off)
|
|
{
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
|
|
|
|
BUG_ON(!ocfs2_is_cluster_bitmap(inode));
|
|
|
|
*bg_blkno = ocfs2_which_cluster_group(inode,
|
|
data_cluster);
|
|
|
|
if (*bg_blkno == osb->first_cluster_group_blkno)
|
|
*bg_bit_off = (u16) data_cluster;
|
|
else
|
|
*bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
|
|
data_blkno - *bg_blkno);
|
|
}
|
|
|
|
/*
|
|
* min_bits - minimum contiguous chunk from this total allocation we
|
|
* can handle. set to what we asked for originally for a full
|
|
* contig. allocation, set to '1' to indicate we can deal with extents
|
|
* of any size.
|
|
*/
|
|
int __ocfs2_claim_clusters(handle_t *handle,
|
|
struct ocfs2_alloc_context *ac,
|
|
u32 min_clusters,
|
|
u32 max_clusters,
|
|
u32 *cluster_start,
|
|
u32 *num_clusters)
|
|
{
|
|
int status;
|
|
unsigned int bits_wanted = max_clusters;
|
|
struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
|
|
struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
|
|
|
|
BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
|
|
|
|
BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
|
|
&& ac->ac_which != OCFS2_AC_USE_MAIN);
|
|
|
|
if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
|
|
WARN_ON(min_clusters > 1);
|
|
|
|
status = ocfs2_claim_local_alloc_bits(osb,
|
|
handle,
|
|
ac,
|
|
bits_wanted,
|
|
cluster_start,
|
|
num_clusters);
|
|
if (!status)
|
|
atomic_inc(&osb->alloc_stats.local_data);
|
|
} else {
|
|
if (min_clusters > (osb->bitmap_cpg - 1)) {
|
|
/* The only paths asking for contiguousness
|
|
* should know about this already. */
|
|
mlog(ML_ERROR, "minimum allocation requested %u exceeds "
|
|
"group bitmap size %u!\n", min_clusters,
|
|
osb->bitmap_cpg);
|
|
status = -ENOSPC;
|
|
goto bail;
|
|
}
|
|
/* clamp the current request down to a realistic size. */
|
|
if (bits_wanted > (osb->bitmap_cpg - 1))
|
|
bits_wanted = osb->bitmap_cpg - 1;
|
|
|
|
status = ocfs2_claim_suballoc_bits(ac,
|
|
handle,
|
|
bits_wanted,
|
|
min_clusters,
|
|
&res);
|
|
if (!status) {
|
|
BUG_ON(res.sr_blkno); /* cluster alloc can't set */
|
|
*cluster_start =
|
|
ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
|
|
res.sr_bg_blkno,
|
|
res.sr_bit_offset);
|
|
atomic_inc(&osb->alloc_stats.bitmap_data);
|
|
*num_clusters = res.sr_bits;
|
|
}
|
|
}
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ac->ac_bits_given += *num_clusters;
|
|
|
|
bail:
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_claim_clusters(handle_t *handle,
|
|
struct ocfs2_alloc_context *ac,
|
|
u32 min_clusters,
|
|
u32 *cluster_start,
|
|
u32 *num_clusters)
|
|
{
|
|
unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
|
|
|
|
return __ocfs2_claim_clusters(handle, ac, min_clusters,
|
|
bits_wanted, cluster_start, num_clusters);
|
|
}
|
|
|
|
static int ocfs2_block_group_clear_bits(handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct ocfs2_group_desc *bg,
|
|
struct buffer_head *group_bh,
|
|
unsigned int bit_off,
|
|
unsigned int num_bits,
|
|
void (*undo_fn)(unsigned int bit,
|
|
unsigned long *bmap))
|
|
{
|
|
int status;
|
|
unsigned int tmp;
|
|
struct ocfs2_group_desc *undo_bg = NULL;
|
|
struct journal_head *jh;
|
|
|
|
/* The caller got this descriptor from
|
|
* ocfs2_read_group_descriptor(). Any corruption is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
|
|
|
|
trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
|
|
|
|
BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
|
|
status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
|
|
group_bh,
|
|
undo_fn ?
|
|
OCFS2_JOURNAL_ACCESS_UNDO :
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
jh = bh2jh(group_bh);
|
|
if (undo_fn) {
|
|
spin_lock(&jh->b_state_lock);
|
|
undo_bg = (struct ocfs2_group_desc *) jh->b_committed_data;
|
|
BUG_ON(!undo_bg);
|
|
}
|
|
|
|
tmp = num_bits;
|
|
while(tmp--) {
|
|
ocfs2_clear_bit((bit_off + tmp),
|
|
(unsigned long *) bg->bg_bitmap);
|
|
if (undo_fn)
|
|
undo_fn(bit_off + tmp,
|
|
(unsigned long *) undo_bg->bg_bitmap);
|
|
}
|
|
le16_add_cpu(&bg->bg_free_bits_count, num_bits);
|
|
if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
|
|
if (undo_fn)
|
|
spin_unlock(&jh->b_state_lock);
|
|
return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
|
|
(unsigned long long)le64_to_cpu(bg->bg_blkno),
|
|
le16_to_cpu(bg->bg_bits),
|
|
le16_to_cpu(bg->bg_free_bits_count),
|
|
num_bits);
|
|
}
|
|
|
|
if (undo_fn)
|
|
spin_unlock(&jh->b_state_lock);
|
|
|
|
ocfs2_journal_dirty(handle, group_bh);
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* expects the suballoc inode to already be locked.
|
|
*/
|
|
static int _ocfs2_free_suballoc_bits(handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct buffer_head *alloc_bh,
|
|
unsigned int start_bit,
|
|
u64 bg_blkno,
|
|
unsigned int count,
|
|
void (*undo_fn)(unsigned int bit,
|
|
unsigned long *bitmap))
|
|
{
|
|
int status = 0;
|
|
u32 tmp_used;
|
|
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
|
|
struct ocfs2_chain_list *cl = &fe->id2.i_chain;
|
|
struct buffer_head *group_bh = NULL;
|
|
struct ocfs2_group_desc *group;
|
|
|
|
/* The alloc_bh comes from ocfs2_free_dinode() or
|
|
* ocfs2_free_clusters(). The callers have all locked the
|
|
* allocator and gotten alloc_bh from the lock call. This
|
|
* validates the dinode buffer. Any corruption that has happened
|
|
* is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
|
|
BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
|
|
|
|
trace_ocfs2_free_suballoc_bits(
|
|
(unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
|
|
(unsigned long long)bg_blkno,
|
|
start_bit, count);
|
|
|
|
status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
|
|
&group_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
group = (struct ocfs2_group_desc *) group_bh->b_data;
|
|
|
|
BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
|
|
|
|
status = ocfs2_block_group_clear_bits(handle, alloc_inode,
|
|
group, group_bh,
|
|
start_bit, count, undo_fn);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
|
|
alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
|
|
start_bit, count);
|
|
goto bail;
|
|
}
|
|
|
|
le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
|
|
count);
|
|
tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
|
|
fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
|
|
ocfs2_journal_dirty(handle, alloc_bh);
|
|
|
|
bail:
|
|
brelse(group_bh);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_free_suballoc_bits(handle_t *handle,
|
|
struct inode *alloc_inode,
|
|
struct buffer_head *alloc_bh,
|
|
unsigned int start_bit,
|
|
u64 bg_blkno,
|
|
unsigned int count)
|
|
{
|
|
return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
|
|
start_bit, bg_blkno, count, NULL);
|
|
}
|
|
|
|
int ocfs2_free_dinode(handle_t *handle,
|
|
struct inode *inode_alloc_inode,
|
|
struct buffer_head *inode_alloc_bh,
|
|
struct ocfs2_dinode *di)
|
|
{
|
|
u64 blk = le64_to_cpu(di->i_blkno);
|
|
u16 bit = le16_to_cpu(di->i_suballoc_bit);
|
|
u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
|
|
|
|
if (di->i_suballoc_loc)
|
|
bg_blkno = le64_to_cpu(di->i_suballoc_loc);
|
|
return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
|
|
inode_alloc_bh, bit, bg_blkno, 1);
|
|
}
|
|
|
|
static int _ocfs2_free_clusters(handle_t *handle,
|
|
struct inode *bitmap_inode,
|
|
struct buffer_head *bitmap_bh,
|
|
u64 start_blk,
|
|
unsigned int num_clusters,
|
|
void (*undo_fn)(unsigned int bit,
|
|
unsigned long *bitmap))
|
|
{
|
|
int status;
|
|
u16 bg_start_bit;
|
|
u64 bg_blkno;
|
|
|
|
/* You can't ever have a contiguous set of clusters
|
|
* bigger than a block group bitmap so we never have to worry
|
|
* about looping on them.
|
|
* This is expensive. We can safely remove once this stuff has
|
|
* gotten tested really well. */
|
|
BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb,
|
|
ocfs2_blocks_to_clusters(bitmap_inode->i_sb,
|
|
start_blk)));
|
|
|
|
|
|
ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
|
|
&bg_start_bit);
|
|
|
|
trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
|
|
(unsigned long long)start_blk,
|
|
bg_start_bit, num_clusters);
|
|
|
|
status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
|
|
bg_start_bit, bg_blkno,
|
|
num_clusters, undo_fn);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
|
|
num_clusters);
|
|
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_free_clusters(handle_t *handle,
|
|
struct inode *bitmap_inode,
|
|
struct buffer_head *bitmap_bh,
|
|
u64 start_blk,
|
|
unsigned int num_clusters)
|
|
{
|
|
return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
|
|
start_blk, num_clusters,
|
|
_ocfs2_set_bit);
|
|
}
|
|
|
|
/*
|
|
* Give never-used clusters back to the global bitmap. We don't need
|
|
* to protect these bits in the undo buffer.
|
|
*/
|
|
int ocfs2_release_clusters(handle_t *handle,
|
|
struct inode *bitmap_inode,
|
|
struct buffer_head *bitmap_bh,
|
|
u64 start_blk,
|
|
unsigned int num_clusters)
|
|
{
|
|
return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
|
|
start_blk, num_clusters,
|
|
_ocfs2_clear_bit);
|
|
}
|
|
|
|
/*
|
|
* For a given allocation, determine which allocators will need to be
|
|
* accessed, and lock them, reserving the appropriate number of bits.
|
|
*
|
|
* Sparse file systems call this from ocfs2_write_begin_nolock()
|
|
* and ocfs2_allocate_unwritten_extents().
|
|
*
|
|
* File systems which don't support holes call this from
|
|
* ocfs2_extend_allocation().
|
|
*/
|
|
int ocfs2_lock_allocators(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
u32 clusters_to_add, u32 extents_to_split,
|
|
struct ocfs2_alloc_context **data_ac,
|
|
struct ocfs2_alloc_context **meta_ac)
|
|
{
|
|
int ret = 0, num_free_extents;
|
|
unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
*meta_ac = NULL;
|
|
if (data_ac)
|
|
*data_ac = NULL;
|
|
|
|
BUG_ON(clusters_to_add != 0 && data_ac == NULL);
|
|
|
|
num_free_extents = ocfs2_num_free_extents(et);
|
|
if (num_free_extents < 0) {
|
|
ret = num_free_extents;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Sparse allocation file systems need to be more conservative
|
|
* with reserving room for expansion - the actual allocation
|
|
* happens while we've got a journal handle open so re-taking
|
|
* a cluster lock (because we ran out of room for another
|
|
* extent) will violate ordering rules.
|
|
*
|
|
* Most of the time we'll only be seeing this 1 cluster at a time
|
|
* anyway.
|
|
*
|
|
* Always lock for any unwritten extents - we might want to
|
|
* add blocks during a split.
|
|
*/
|
|
if (!num_free_extents ||
|
|
(ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
|
|
ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
|
|
if (ret < 0) {
|
|
if (ret != -ENOSPC)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (clusters_to_add == 0)
|
|
goto out;
|
|
|
|
ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
|
|
if (ret < 0) {
|
|
if (ret != -ENOSPC)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (ret) {
|
|
if (*meta_ac) {
|
|
ocfs2_free_alloc_context(*meta_ac);
|
|
*meta_ac = NULL;
|
|
}
|
|
|
|
/*
|
|
* We cannot have an error and a non null *data_ac.
|
|
*/
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read the inode specified by blkno to get suballoc_slot and
|
|
* suballoc_bit.
|
|
*/
|
|
static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
|
|
u16 *suballoc_slot, u64 *group_blkno,
|
|
u16 *suballoc_bit)
|
|
{
|
|
int status;
|
|
struct buffer_head *inode_bh = NULL;
|
|
struct ocfs2_dinode *inode_fe;
|
|
|
|
trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
|
|
|
|
/* dirty read disk */
|
|
status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
|
|
if (status < 0) {
|
|
mlog(ML_ERROR, "read block %llu failed %d\n",
|
|
(unsigned long long)blkno, status);
|
|
goto bail;
|
|
}
|
|
|
|
inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
|
|
if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
|
|
mlog(ML_ERROR, "invalid inode %llu requested\n",
|
|
(unsigned long long)blkno);
|
|
status = -EINVAL;
|
|
goto bail;
|
|
}
|
|
|
|
if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
|
|
(u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
|
|
mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
|
|
(unsigned long long)blkno,
|
|
(u32)le16_to_cpu(inode_fe->i_suballoc_slot));
|
|
status = -EINVAL;
|
|
goto bail;
|
|
}
|
|
|
|
if (suballoc_slot)
|
|
*suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
|
|
if (suballoc_bit)
|
|
*suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
|
|
if (group_blkno)
|
|
*group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
|
|
|
|
bail:
|
|
brelse(inode_bh);
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* test whether bit is SET in allocator bitmap or not. on success, 0
|
|
* is returned and *res is 1 for SET; 0 otherwise. when fails, errno
|
|
* is returned and *res is meaningless. Call this after you have
|
|
* cluster locked against suballoc, or you may get a result based on
|
|
* non-up2date contents
|
|
*/
|
|
static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
|
|
struct inode *suballoc,
|
|
struct buffer_head *alloc_bh,
|
|
u64 group_blkno, u64 blkno,
|
|
u16 bit, int *res)
|
|
{
|
|
struct ocfs2_dinode *alloc_di;
|
|
struct ocfs2_group_desc *group;
|
|
struct buffer_head *group_bh = NULL;
|
|
u64 bg_blkno;
|
|
int status;
|
|
|
|
trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
|
|
(unsigned int)bit);
|
|
|
|
alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
|
|
if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
|
|
mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
|
|
(unsigned int)bit,
|
|
ocfs2_bits_per_group(&alloc_di->id2.i_chain));
|
|
status = -EINVAL;
|
|
goto bail;
|
|
}
|
|
|
|
bg_blkno = group_blkno ? group_blkno :
|
|
ocfs2_which_suballoc_group(blkno, bit);
|
|
status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
|
|
&group_bh);
|
|
if (status < 0) {
|
|
mlog(ML_ERROR, "read group %llu failed %d\n",
|
|
(unsigned long long)bg_blkno, status);
|
|
goto bail;
|
|
}
|
|
|
|
group = (struct ocfs2_group_desc *) group_bh->b_data;
|
|
*res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
|
|
|
|
bail:
|
|
brelse(group_bh);
|
|
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Test if the bit representing this inode (blkno) is set in the
|
|
* suballocator.
|
|
*
|
|
* On success, 0 is returned and *res is 1 for SET; 0 otherwise.
|
|
*
|
|
* In the event of failure, a negative value is returned and *res is
|
|
* meaningless.
|
|
*
|
|
* Callers must make sure to hold nfs_sync_lock to prevent
|
|
* ocfs2_delete_inode() on another node from accessing the same
|
|
* suballocator concurrently.
|
|
*/
|
|
int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
|
|
{
|
|
int status;
|
|
u64 group_blkno = 0;
|
|
u16 suballoc_bit = 0, suballoc_slot = 0;
|
|
struct inode *inode_alloc_inode;
|
|
struct buffer_head *alloc_bh = NULL;
|
|
|
|
trace_ocfs2_test_inode_bit((unsigned long long)blkno);
|
|
|
|
status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
|
|
&group_blkno, &suballoc_bit);
|
|
if (status < 0) {
|
|
mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
|
|
goto bail;
|
|
}
|
|
|
|
if (suballoc_slot == (u16)OCFS2_INVALID_SLOT)
|
|
inode_alloc_inode = ocfs2_get_system_file_inode(osb,
|
|
GLOBAL_INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
|
|
else
|
|
inode_alloc_inode = ocfs2_get_system_file_inode(osb,
|
|
INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
|
|
if (!inode_alloc_inode) {
|
|
/* the error code could be inaccurate, but we are not able to
|
|
* get the correct one. */
|
|
status = -EINVAL;
|
|
mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
|
|
(u32)suballoc_slot);
|
|
goto bail;
|
|
}
|
|
|
|
inode_lock(inode_alloc_inode);
|
|
status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
|
|
if (status < 0) {
|
|
inode_unlock(inode_alloc_inode);
|
|
iput(inode_alloc_inode);
|
|
mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
|
|
(u32)suballoc_slot, status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
|
|
group_blkno, blkno, suballoc_bit, res);
|
|
if (status < 0)
|
|
mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
|
|
|
|
ocfs2_inode_unlock(inode_alloc_inode, 0);
|
|
inode_unlock(inode_alloc_inode);
|
|
|
|
iput(inode_alloc_inode);
|
|
brelse(alloc_bh);
|
|
bail:
|
|
if (status)
|
|
mlog_errno(status);
|
|
return status;
|
|
}
|