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adc2c8d0b3
Fixes Coccinelle/coccicheck warnings reported by do_div.cocci. Compared to do_div(), div64_ul() does not implicitly cast the divisor and does not unnecessarily calculate the remainder. Link: https://lkml.kernel.org/r/20240229210456.63234-2-thorsten.blum@toblux.com Link: https://lkml.kernel.org/r/20240306142547.4612-1-konishi.ryusuke@gmail.com Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
914 lines
23 KiB
C
914 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* the_nilfs shared structure.
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* Written by Ryusuke Konishi.
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*
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*/
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#include <linux/buffer_head.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/random.h>
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#include <linux/log2.h>
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#include <linux/crc32.h>
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#include "nilfs.h"
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#include "segment.h"
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#include "alloc.h"
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#include "cpfile.h"
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#include "sufile.h"
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#include "dat.h"
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#include "segbuf.h"
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static int nilfs_valid_sb(struct nilfs_super_block *sbp);
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void nilfs_set_last_segment(struct the_nilfs *nilfs,
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sector_t start_blocknr, u64 seq, __u64 cno)
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{
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spin_lock(&nilfs->ns_last_segment_lock);
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nilfs->ns_last_pseg = start_blocknr;
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nilfs->ns_last_seq = seq;
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nilfs->ns_last_cno = cno;
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if (!nilfs_sb_dirty(nilfs)) {
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if (nilfs->ns_prev_seq == nilfs->ns_last_seq)
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goto stay_cursor;
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set_nilfs_sb_dirty(nilfs);
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}
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nilfs->ns_prev_seq = nilfs->ns_last_seq;
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stay_cursor:
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spin_unlock(&nilfs->ns_last_segment_lock);
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}
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/**
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* alloc_nilfs - allocate a nilfs object
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* @sb: super block instance
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*
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* Return Value: On success, pointer to the_nilfs is returned.
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* On error, NULL is returned.
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*/
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struct the_nilfs *alloc_nilfs(struct super_block *sb)
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{
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struct the_nilfs *nilfs;
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nilfs = kzalloc(sizeof(*nilfs), GFP_KERNEL);
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if (!nilfs)
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return NULL;
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nilfs->ns_sb = sb;
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nilfs->ns_bdev = sb->s_bdev;
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atomic_set(&nilfs->ns_ndirtyblks, 0);
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init_rwsem(&nilfs->ns_sem);
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mutex_init(&nilfs->ns_snapshot_mount_mutex);
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INIT_LIST_HEAD(&nilfs->ns_dirty_files);
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INIT_LIST_HEAD(&nilfs->ns_gc_inodes);
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spin_lock_init(&nilfs->ns_inode_lock);
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spin_lock_init(&nilfs->ns_next_gen_lock);
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spin_lock_init(&nilfs->ns_last_segment_lock);
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nilfs->ns_cptree = RB_ROOT;
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spin_lock_init(&nilfs->ns_cptree_lock);
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init_rwsem(&nilfs->ns_segctor_sem);
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nilfs->ns_sb_update_freq = NILFS_SB_FREQ;
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return nilfs;
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}
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/**
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* destroy_nilfs - destroy nilfs object
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* @nilfs: nilfs object to be released
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*/
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void destroy_nilfs(struct the_nilfs *nilfs)
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{
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might_sleep();
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if (nilfs_init(nilfs)) {
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brelse(nilfs->ns_sbh[0]);
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brelse(nilfs->ns_sbh[1]);
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}
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kfree(nilfs);
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}
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static int nilfs_load_super_root(struct the_nilfs *nilfs,
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struct super_block *sb, sector_t sr_block)
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{
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struct buffer_head *bh_sr;
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struct nilfs_super_root *raw_sr;
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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struct nilfs_inode *rawi;
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unsigned int dat_entry_size, segment_usage_size, checkpoint_size;
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unsigned int inode_size;
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int err;
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err = nilfs_read_super_root_block(nilfs, sr_block, &bh_sr, 1);
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if (unlikely(err))
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return err;
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down_read(&nilfs->ns_sem);
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dat_entry_size = le16_to_cpu(sbp[0]->s_dat_entry_size);
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checkpoint_size = le16_to_cpu(sbp[0]->s_checkpoint_size);
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segment_usage_size = le16_to_cpu(sbp[0]->s_segment_usage_size);
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up_read(&nilfs->ns_sem);
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inode_size = nilfs->ns_inode_size;
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rawi = (void *)bh_sr->b_data + NILFS_SR_DAT_OFFSET(inode_size);
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err = nilfs_dat_read(sb, dat_entry_size, rawi, &nilfs->ns_dat);
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if (err)
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goto failed;
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rawi = (void *)bh_sr->b_data + NILFS_SR_CPFILE_OFFSET(inode_size);
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err = nilfs_cpfile_read(sb, checkpoint_size, rawi, &nilfs->ns_cpfile);
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if (err)
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goto failed_dat;
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rawi = (void *)bh_sr->b_data + NILFS_SR_SUFILE_OFFSET(inode_size);
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err = nilfs_sufile_read(sb, segment_usage_size, rawi,
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&nilfs->ns_sufile);
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if (err)
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goto failed_cpfile;
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raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
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nilfs->ns_nongc_ctime = le64_to_cpu(raw_sr->sr_nongc_ctime);
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failed:
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brelse(bh_sr);
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return err;
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failed_cpfile:
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iput(nilfs->ns_cpfile);
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failed_dat:
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iput(nilfs->ns_dat);
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goto failed;
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}
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static void nilfs_init_recovery_info(struct nilfs_recovery_info *ri)
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{
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memset(ri, 0, sizeof(*ri));
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INIT_LIST_HEAD(&ri->ri_used_segments);
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}
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static void nilfs_clear_recovery_info(struct nilfs_recovery_info *ri)
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{
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nilfs_dispose_segment_list(&ri->ri_used_segments);
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}
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/**
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* nilfs_store_log_cursor - load log cursor from a super block
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* @nilfs: nilfs object
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* @sbp: buffer storing super block to be read
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*
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* nilfs_store_log_cursor() reads the last position of the log
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* containing a super root from a given super block, and initializes
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* relevant information on the nilfs object preparatory for log
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* scanning and recovery.
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*/
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static int nilfs_store_log_cursor(struct the_nilfs *nilfs,
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struct nilfs_super_block *sbp)
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{
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int ret = 0;
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nilfs->ns_last_pseg = le64_to_cpu(sbp->s_last_pseg);
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nilfs->ns_last_cno = le64_to_cpu(sbp->s_last_cno);
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nilfs->ns_last_seq = le64_to_cpu(sbp->s_last_seq);
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nilfs->ns_prev_seq = nilfs->ns_last_seq;
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nilfs->ns_seg_seq = nilfs->ns_last_seq;
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nilfs->ns_segnum =
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nilfs_get_segnum_of_block(nilfs, nilfs->ns_last_pseg);
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nilfs->ns_cno = nilfs->ns_last_cno + 1;
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if (nilfs->ns_segnum >= nilfs->ns_nsegments) {
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nilfs_err(nilfs->ns_sb,
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"pointed segment number is out of range: segnum=%llu, nsegments=%lu",
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(unsigned long long)nilfs->ns_segnum,
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nilfs->ns_nsegments);
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ret = -EINVAL;
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}
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return ret;
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}
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/**
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* nilfs_get_blocksize - get block size from raw superblock data
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* @sb: super block instance
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* @sbp: superblock raw data buffer
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* @blocksize: place to store block size
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*
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* nilfs_get_blocksize() calculates the block size from the block size
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* exponent information written in @sbp and stores it in @blocksize,
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* or aborts with an error message if it's too large.
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*
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* Return Value: On success, 0 is returned. If the block size is too
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* large, -EINVAL is returned.
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*/
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static int nilfs_get_blocksize(struct super_block *sb,
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struct nilfs_super_block *sbp, int *blocksize)
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{
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unsigned int shift_bits = le32_to_cpu(sbp->s_log_block_size);
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if (unlikely(shift_bits >
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ilog2(NILFS_MAX_BLOCK_SIZE) - BLOCK_SIZE_BITS)) {
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nilfs_err(sb, "too large filesystem blocksize: 2 ^ %u KiB",
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shift_bits);
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return -EINVAL;
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}
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*blocksize = BLOCK_SIZE << shift_bits;
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return 0;
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}
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/**
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* load_nilfs - load and recover the nilfs
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* @nilfs: the_nilfs structure to be released
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* @sb: super block instance used to recover past segment
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*
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* load_nilfs() searches and load the latest super root,
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* attaches the last segment, and does recovery if needed.
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* The caller must call this exclusively for simultaneous mounts.
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*/
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int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb)
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{
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struct nilfs_recovery_info ri;
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unsigned int s_flags = sb->s_flags;
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int really_read_only = bdev_read_only(nilfs->ns_bdev);
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int valid_fs = nilfs_valid_fs(nilfs);
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int err;
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if (!valid_fs) {
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nilfs_warn(sb, "mounting unchecked fs");
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if (s_flags & SB_RDONLY) {
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nilfs_info(sb,
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"recovery required for readonly filesystem");
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nilfs_info(sb,
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"write access will be enabled during recovery");
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}
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}
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nilfs_init_recovery_info(&ri);
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err = nilfs_search_super_root(nilfs, &ri);
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if (unlikely(err)) {
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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int blocksize;
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if (err != -EINVAL)
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goto scan_error;
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if (!nilfs_valid_sb(sbp[1])) {
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nilfs_warn(sb,
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"unable to fall back to spare super block");
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goto scan_error;
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}
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nilfs_info(sb, "trying rollback from an earlier position");
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/*
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* restore super block with its spare and reconfigure
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* relevant states of the nilfs object.
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*/
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memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
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nilfs->ns_crc_seed = le32_to_cpu(sbp[0]->s_crc_seed);
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nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime);
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/* verify consistency between two super blocks */
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err = nilfs_get_blocksize(sb, sbp[0], &blocksize);
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if (err)
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goto scan_error;
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if (blocksize != nilfs->ns_blocksize) {
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nilfs_warn(sb,
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"blocksize differs between two super blocks (%d != %d)",
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blocksize, nilfs->ns_blocksize);
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err = -EINVAL;
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goto scan_error;
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}
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err = nilfs_store_log_cursor(nilfs, sbp[0]);
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if (err)
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goto scan_error;
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/* drop clean flag to allow roll-forward and recovery */
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nilfs->ns_mount_state &= ~NILFS_VALID_FS;
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valid_fs = 0;
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err = nilfs_search_super_root(nilfs, &ri);
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if (err)
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goto scan_error;
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}
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err = nilfs_load_super_root(nilfs, sb, ri.ri_super_root);
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if (unlikely(err)) {
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nilfs_err(sb, "error %d while loading super root", err);
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goto failed;
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}
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err = nilfs_sysfs_create_device_group(sb);
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if (unlikely(err))
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goto sysfs_error;
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if (valid_fs)
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goto skip_recovery;
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if (s_flags & SB_RDONLY) {
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__u64 features;
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if (nilfs_test_opt(nilfs, NORECOVERY)) {
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nilfs_info(sb,
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"norecovery option specified, skipping roll-forward recovery");
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goto skip_recovery;
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}
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features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
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~NILFS_FEATURE_COMPAT_RO_SUPP;
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if (features) {
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nilfs_err(sb,
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"couldn't proceed with recovery because of unsupported optional features (%llx)",
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(unsigned long long)features);
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err = -EROFS;
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goto failed_unload;
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}
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if (really_read_only) {
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nilfs_err(sb,
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"write access unavailable, cannot proceed");
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err = -EROFS;
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goto failed_unload;
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}
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sb->s_flags &= ~SB_RDONLY;
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} else if (nilfs_test_opt(nilfs, NORECOVERY)) {
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nilfs_err(sb,
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"recovery cancelled because norecovery option was specified for a read/write mount");
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err = -EINVAL;
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goto failed_unload;
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}
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err = nilfs_salvage_orphan_logs(nilfs, sb, &ri);
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if (err)
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goto failed_unload;
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down_write(&nilfs->ns_sem);
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nilfs->ns_mount_state |= NILFS_VALID_FS; /* set "clean" flag */
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err = nilfs_cleanup_super(sb);
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up_write(&nilfs->ns_sem);
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if (err) {
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nilfs_err(sb,
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"error %d updating super block. recovery unfinished.",
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err);
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goto failed_unload;
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}
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nilfs_info(sb, "recovery complete");
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skip_recovery:
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nilfs_clear_recovery_info(&ri);
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sb->s_flags = s_flags;
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return 0;
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scan_error:
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nilfs_err(sb, "error %d while searching super root", err);
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goto failed;
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failed_unload:
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nilfs_sysfs_delete_device_group(nilfs);
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sysfs_error:
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iput(nilfs->ns_cpfile);
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iput(nilfs->ns_sufile);
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iput(nilfs->ns_dat);
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failed:
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nilfs_clear_recovery_info(&ri);
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sb->s_flags = s_flags;
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return err;
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}
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static unsigned long long nilfs_max_size(unsigned int blkbits)
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{
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unsigned int max_bits;
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unsigned long long res = MAX_LFS_FILESIZE; /* page cache limit */
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max_bits = blkbits + NILFS_BMAP_KEY_BIT; /* bmap size limit */
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if (max_bits < 64)
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res = min_t(unsigned long long, res, (1ULL << max_bits) - 1);
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return res;
|
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}
|
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|
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/**
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* nilfs_nrsvsegs - calculate the number of reserved segments
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* @nilfs: nilfs object
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* @nsegs: total number of segments
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*/
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unsigned long nilfs_nrsvsegs(struct the_nilfs *nilfs, unsigned long nsegs)
|
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{
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return max_t(unsigned long, NILFS_MIN_NRSVSEGS,
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DIV_ROUND_UP(nsegs * nilfs->ns_r_segments_percentage,
|
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100));
|
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}
|
|
|
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/**
|
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* nilfs_max_segment_count - calculate the maximum number of segments
|
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* @nilfs: nilfs object
|
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*/
|
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static u64 nilfs_max_segment_count(struct the_nilfs *nilfs)
|
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{
|
|
u64 max_count = U64_MAX;
|
|
|
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max_count = div64_ul(max_count, nilfs->ns_blocks_per_segment);
|
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return min_t(u64, max_count, ULONG_MAX);
|
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}
|
|
|
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void nilfs_set_nsegments(struct the_nilfs *nilfs, unsigned long nsegs)
|
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{
|
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nilfs->ns_nsegments = nsegs;
|
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nilfs->ns_nrsvsegs = nilfs_nrsvsegs(nilfs, nsegs);
|
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}
|
|
|
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static int nilfs_store_disk_layout(struct the_nilfs *nilfs,
|
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struct nilfs_super_block *sbp)
|
|
{
|
|
u64 nsegments, nblocks;
|
|
|
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if (le32_to_cpu(sbp->s_rev_level) < NILFS_MIN_SUPP_REV) {
|
|
nilfs_err(nilfs->ns_sb,
|
|
"unsupported revision (superblock rev.=%d.%d, current rev.=%d.%d). Please check the version of mkfs.nilfs(2).",
|
|
le32_to_cpu(sbp->s_rev_level),
|
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le16_to_cpu(sbp->s_minor_rev_level),
|
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NILFS_CURRENT_REV, NILFS_MINOR_REV);
|
|
return -EINVAL;
|
|
}
|
|
nilfs->ns_sbsize = le16_to_cpu(sbp->s_bytes);
|
|
if (nilfs->ns_sbsize > BLOCK_SIZE)
|
|
return -EINVAL;
|
|
|
|
nilfs->ns_inode_size = le16_to_cpu(sbp->s_inode_size);
|
|
if (nilfs->ns_inode_size > nilfs->ns_blocksize) {
|
|
nilfs_err(nilfs->ns_sb, "too large inode size: %d bytes",
|
|
nilfs->ns_inode_size);
|
|
return -EINVAL;
|
|
} else if (nilfs->ns_inode_size < NILFS_MIN_INODE_SIZE) {
|
|
nilfs_err(nilfs->ns_sb, "too small inode size: %d bytes",
|
|
nilfs->ns_inode_size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
nilfs->ns_first_ino = le32_to_cpu(sbp->s_first_ino);
|
|
|
|
nilfs->ns_blocks_per_segment = le32_to_cpu(sbp->s_blocks_per_segment);
|
|
if (nilfs->ns_blocks_per_segment < NILFS_SEG_MIN_BLOCKS) {
|
|
nilfs_err(nilfs->ns_sb, "too short segment: %lu blocks",
|
|
nilfs->ns_blocks_per_segment);
|
|
return -EINVAL;
|
|
}
|
|
|
|
nilfs->ns_first_data_block = le64_to_cpu(sbp->s_first_data_block);
|
|
nilfs->ns_r_segments_percentage =
|
|
le32_to_cpu(sbp->s_r_segments_percentage);
|
|
if (nilfs->ns_r_segments_percentage < 1 ||
|
|
nilfs->ns_r_segments_percentage > 99) {
|
|
nilfs_err(nilfs->ns_sb,
|
|
"invalid reserved segments percentage: %lu",
|
|
nilfs->ns_r_segments_percentage);
|
|
return -EINVAL;
|
|
}
|
|
|
|
nsegments = le64_to_cpu(sbp->s_nsegments);
|
|
if (nsegments > nilfs_max_segment_count(nilfs)) {
|
|
nilfs_err(nilfs->ns_sb,
|
|
"segment count %llu exceeds upper limit (%llu segments)",
|
|
(unsigned long long)nsegments,
|
|
(unsigned long long)nilfs_max_segment_count(nilfs));
|
|
return -EINVAL;
|
|
}
|
|
|
|
nblocks = sb_bdev_nr_blocks(nilfs->ns_sb);
|
|
if (nblocks) {
|
|
u64 min_block_count = nsegments * nilfs->ns_blocks_per_segment;
|
|
/*
|
|
* To avoid failing to mount early device images without a
|
|
* second superblock, exclude that block count from the
|
|
* "min_block_count" calculation.
|
|
*/
|
|
|
|
if (nblocks < min_block_count) {
|
|
nilfs_err(nilfs->ns_sb,
|
|
"total number of segment blocks %llu exceeds device size (%llu blocks)",
|
|
(unsigned long long)min_block_count,
|
|
(unsigned long long)nblocks);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
nilfs_set_nsegments(nilfs, nsegments);
|
|
nilfs->ns_crc_seed = le32_to_cpu(sbp->s_crc_seed);
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_valid_sb(struct nilfs_super_block *sbp)
|
|
{
|
|
static unsigned char sum[4];
|
|
const int sumoff = offsetof(struct nilfs_super_block, s_sum);
|
|
size_t bytes;
|
|
u32 crc;
|
|
|
|
if (!sbp || le16_to_cpu(sbp->s_magic) != NILFS_SUPER_MAGIC)
|
|
return 0;
|
|
bytes = le16_to_cpu(sbp->s_bytes);
|
|
if (bytes < sumoff + 4 || bytes > BLOCK_SIZE)
|
|
return 0;
|
|
crc = crc32_le(le32_to_cpu(sbp->s_crc_seed), (unsigned char *)sbp,
|
|
sumoff);
|
|
crc = crc32_le(crc, sum, 4);
|
|
crc = crc32_le(crc, (unsigned char *)sbp + sumoff + 4,
|
|
bytes - sumoff - 4);
|
|
return crc == le32_to_cpu(sbp->s_sum);
|
|
}
|
|
|
|
/**
|
|
* nilfs_sb2_bad_offset - check the location of the second superblock
|
|
* @sbp: superblock raw data buffer
|
|
* @offset: byte offset of second superblock calculated from device size
|
|
*
|
|
* nilfs_sb2_bad_offset() checks if the position on the second
|
|
* superblock is valid or not based on the filesystem parameters
|
|
* stored in @sbp. If @offset points to a location within the segment
|
|
* area, or if the parameters themselves are not normal, it is
|
|
* determined to be invalid.
|
|
*
|
|
* Return Value: true if invalid, false if valid.
|
|
*/
|
|
static bool nilfs_sb2_bad_offset(struct nilfs_super_block *sbp, u64 offset)
|
|
{
|
|
unsigned int shift_bits = le32_to_cpu(sbp->s_log_block_size);
|
|
u32 blocks_per_segment = le32_to_cpu(sbp->s_blocks_per_segment);
|
|
u64 nsegments = le64_to_cpu(sbp->s_nsegments);
|
|
u64 index;
|
|
|
|
if (blocks_per_segment < NILFS_SEG_MIN_BLOCKS ||
|
|
shift_bits > ilog2(NILFS_MAX_BLOCK_SIZE) - BLOCK_SIZE_BITS)
|
|
return true;
|
|
|
|
index = offset >> (shift_bits + BLOCK_SIZE_BITS);
|
|
do_div(index, blocks_per_segment);
|
|
return index < nsegments;
|
|
}
|
|
|
|
static void nilfs_release_super_block(struct the_nilfs *nilfs)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
if (nilfs->ns_sbp[i]) {
|
|
brelse(nilfs->ns_sbh[i]);
|
|
nilfs->ns_sbh[i] = NULL;
|
|
nilfs->ns_sbp[i] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
void nilfs_fall_back_super_block(struct the_nilfs *nilfs)
|
|
{
|
|
brelse(nilfs->ns_sbh[0]);
|
|
nilfs->ns_sbh[0] = nilfs->ns_sbh[1];
|
|
nilfs->ns_sbp[0] = nilfs->ns_sbp[1];
|
|
nilfs->ns_sbh[1] = NULL;
|
|
nilfs->ns_sbp[1] = NULL;
|
|
}
|
|
|
|
void nilfs_swap_super_block(struct the_nilfs *nilfs)
|
|
{
|
|
struct buffer_head *tsbh = nilfs->ns_sbh[0];
|
|
struct nilfs_super_block *tsbp = nilfs->ns_sbp[0];
|
|
|
|
nilfs->ns_sbh[0] = nilfs->ns_sbh[1];
|
|
nilfs->ns_sbp[0] = nilfs->ns_sbp[1];
|
|
nilfs->ns_sbh[1] = tsbh;
|
|
nilfs->ns_sbp[1] = tsbp;
|
|
}
|
|
|
|
static int nilfs_load_super_block(struct the_nilfs *nilfs,
|
|
struct super_block *sb, int blocksize,
|
|
struct nilfs_super_block **sbpp)
|
|
{
|
|
struct nilfs_super_block **sbp = nilfs->ns_sbp;
|
|
struct buffer_head **sbh = nilfs->ns_sbh;
|
|
u64 sb2off, devsize = bdev_nr_bytes(nilfs->ns_bdev);
|
|
int valid[2], swp = 0;
|
|
|
|
if (devsize < NILFS_SEG_MIN_BLOCKS * NILFS_MIN_BLOCK_SIZE + 4096) {
|
|
nilfs_err(sb, "device size too small");
|
|
return -EINVAL;
|
|
}
|
|
sb2off = NILFS_SB2_OFFSET_BYTES(devsize);
|
|
|
|
sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize,
|
|
&sbh[0]);
|
|
sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]);
|
|
|
|
if (!sbp[0]) {
|
|
if (!sbp[1]) {
|
|
nilfs_err(sb, "unable to read superblock");
|
|
return -EIO;
|
|
}
|
|
nilfs_warn(sb,
|
|
"unable to read primary superblock (blocksize = %d)",
|
|
blocksize);
|
|
} else if (!sbp[1]) {
|
|
nilfs_warn(sb,
|
|
"unable to read secondary superblock (blocksize = %d)",
|
|
blocksize);
|
|
}
|
|
|
|
/*
|
|
* Compare two super blocks and set 1 in swp if the secondary
|
|
* super block is valid and newer. Otherwise, set 0 in swp.
|
|
*/
|
|
valid[0] = nilfs_valid_sb(sbp[0]);
|
|
valid[1] = nilfs_valid_sb(sbp[1]);
|
|
swp = valid[1] && (!valid[0] ||
|
|
le64_to_cpu(sbp[1]->s_last_cno) >
|
|
le64_to_cpu(sbp[0]->s_last_cno));
|
|
|
|
if (valid[swp] && nilfs_sb2_bad_offset(sbp[swp], sb2off)) {
|
|
brelse(sbh[1]);
|
|
sbh[1] = NULL;
|
|
sbp[1] = NULL;
|
|
valid[1] = 0;
|
|
swp = 0;
|
|
}
|
|
if (!valid[swp]) {
|
|
nilfs_release_super_block(nilfs);
|
|
nilfs_err(sb, "couldn't find nilfs on the device");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!valid[!swp])
|
|
nilfs_warn(sb,
|
|
"broken superblock, retrying with spare superblock (blocksize = %d)",
|
|
blocksize);
|
|
if (swp)
|
|
nilfs_swap_super_block(nilfs);
|
|
|
|
nilfs->ns_sbwcount = 0;
|
|
nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime);
|
|
nilfs->ns_prot_seq = le64_to_cpu(sbp[valid[1] & !swp]->s_last_seq);
|
|
*sbpp = sbp[0];
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* init_nilfs - initialize a NILFS instance.
|
|
* @nilfs: the_nilfs structure
|
|
* @sb: super block
|
|
* @data: mount options
|
|
*
|
|
* init_nilfs() performs common initialization per block device (e.g.
|
|
* reading the super block, getting disk layout information, initializing
|
|
* shared fields in the_nilfs).
|
|
*
|
|
* Return Value: On success, 0 is returned. On error, a negative error
|
|
* code is returned.
|
|
*/
|
|
int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data)
|
|
{
|
|
struct nilfs_super_block *sbp;
|
|
int blocksize;
|
|
int err;
|
|
|
|
down_write(&nilfs->ns_sem);
|
|
|
|
blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE);
|
|
if (!blocksize) {
|
|
nilfs_err(sb, "unable to set blocksize");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = nilfs_store_magic_and_option(sb, sbp, data);
|
|
if (err)
|
|
goto failed_sbh;
|
|
|
|
err = nilfs_check_feature_compatibility(sb, sbp);
|
|
if (err)
|
|
goto failed_sbh;
|
|
|
|
err = nilfs_get_blocksize(sb, sbp, &blocksize);
|
|
if (err)
|
|
goto failed_sbh;
|
|
|
|
if (blocksize < NILFS_MIN_BLOCK_SIZE) {
|
|
nilfs_err(sb,
|
|
"couldn't mount because of unsupported filesystem blocksize %d",
|
|
blocksize);
|
|
err = -EINVAL;
|
|
goto failed_sbh;
|
|
}
|
|
if (sb->s_blocksize != blocksize) {
|
|
int hw_blocksize = bdev_logical_block_size(sb->s_bdev);
|
|
|
|
if (blocksize < hw_blocksize) {
|
|
nilfs_err(sb,
|
|
"blocksize %d too small for device (sector-size = %d)",
|
|
blocksize, hw_blocksize);
|
|
err = -EINVAL;
|
|
goto failed_sbh;
|
|
}
|
|
nilfs_release_super_block(nilfs);
|
|
if (!sb_set_blocksize(sb, blocksize)) {
|
|
nilfs_err(sb, "bad blocksize %d", blocksize);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp);
|
|
if (err)
|
|
goto out;
|
|
/*
|
|
* Not to failed_sbh; sbh is released automatically
|
|
* when reloading fails.
|
|
*/
|
|
}
|
|
nilfs->ns_blocksize_bits = sb->s_blocksize_bits;
|
|
nilfs->ns_blocksize = blocksize;
|
|
|
|
get_random_bytes(&nilfs->ns_next_generation,
|
|
sizeof(nilfs->ns_next_generation));
|
|
|
|
err = nilfs_store_disk_layout(nilfs, sbp);
|
|
if (err)
|
|
goto failed_sbh;
|
|
|
|
sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits);
|
|
|
|
nilfs->ns_mount_state = le16_to_cpu(sbp->s_state);
|
|
|
|
err = nilfs_store_log_cursor(nilfs, sbp);
|
|
if (err)
|
|
goto failed_sbh;
|
|
|
|
set_nilfs_init(nilfs);
|
|
err = 0;
|
|
out:
|
|
up_write(&nilfs->ns_sem);
|
|
return err;
|
|
|
|
failed_sbh:
|
|
nilfs_release_super_block(nilfs);
|
|
goto out;
|
|
}
|
|
|
|
int nilfs_discard_segments(struct the_nilfs *nilfs, __u64 *segnump,
|
|
size_t nsegs)
|
|
{
|
|
sector_t seg_start, seg_end;
|
|
sector_t start = 0, nblocks = 0;
|
|
unsigned int sects_per_block;
|
|
__u64 *sn;
|
|
int ret = 0;
|
|
|
|
sects_per_block = (1 << nilfs->ns_blocksize_bits) /
|
|
bdev_logical_block_size(nilfs->ns_bdev);
|
|
for (sn = segnump; sn < segnump + nsegs; sn++) {
|
|
nilfs_get_segment_range(nilfs, *sn, &seg_start, &seg_end);
|
|
|
|
if (!nblocks) {
|
|
start = seg_start;
|
|
nblocks = seg_end - seg_start + 1;
|
|
} else if (start + nblocks == seg_start) {
|
|
nblocks += seg_end - seg_start + 1;
|
|
} else {
|
|
ret = blkdev_issue_discard(nilfs->ns_bdev,
|
|
start * sects_per_block,
|
|
nblocks * sects_per_block,
|
|
GFP_NOFS);
|
|
if (ret < 0)
|
|
return ret;
|
|
nblocks = 0;
|
|
}
|
|
}
|
|
if (nblocks)
|
|
ret = blkdev_issue_discard(nilfs->ns_bdev,
|
|
start * sects_per_block,
|
|
nblocks * sects_per_block,
|
|
GFP_NOFS);
|
|
return ret;
|
|
}
|
|
|
|
int nilfs_count_free_blocks(struct the_nilfs *nilfs, sector_t *nblocks)
|
|
{
|
|
unsigned long ncleansegs;
|
|
|
|
ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
|
|
*nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment;
|
|
return 0;
|
|
}
|
|
|
|
int nilfs_near_disk_full(struct the_nilfs *nilfs)
|
|
{
|
|
unsigned long ncleansegs, nincsegs;
|
|
|
|
ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
|
|
nincsegs = atomic_read(&nilfs->ns_ndirtyblks) /
|
|
nilfs->ns_blocks_per_segment + 1;
|
|
|
|
return ncleansegs <= nilfs->ns_nrsvsegs + nincsegs;
|
|
}
|
|
|
|
struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno)
|
|
{
|
|
struct rb_node *n;
|
|
struct nilfs_root *root;
|
|
|
|
spin_lock(&nilfs->ns_cptree_lock);
|
|
n = nilfs->ns_cptree.rb_node;
|
|
while (n) {
|
|
root = rb_entry(n, struct nilfs_root, rb_node);
|
|
|
|
if (cno < root->cno) {
|
|
n = n->rb_left;
|
|
} else if (cno > root->cno) {
|
|
n = n->rb_right;
|
|
} else {
|
|
refcount_inc(&root->count);
|
|
spin_unlock(&nilfs->ns_cptree_lock);
|
|
return root;
|
|
}
|
|
}
|
|
spin_unlock(&nilfs->ns_cptree_lock);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct nilfs_root *
|
|
nilfs_find_or_create_root(struct the_nilfs *nilfs, __u64 cno)
|
|
{
|
|
struct rb_node **p, *parent;
|
|
struct nilfs_root *root, *new;
|
|
int err;
|
|
|
|
root = nilfs_lookup_root(nilfs, cno);
|
|
if (root)
|
|
return root;
|
|
|
|
new = kzalloc(sizeof(*root), GFP_KERNEL);
|
|
if (!new)
|
|
return NULL;
|
|
|
|
spin_lock(&nilfs->ns_cptree_lock);
|
|
|
|
p = &nilfs->ns_cptree.rb_node;
|
|
parent = NULL;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
root = rb_entry(parent, struct nilfs_root, rb_node);
|
|
|
|
if (cno < root->cno) {
|
|
p = &(*p)->rb_left;
|
|
} else if (cno > root->cno) {
|
|
p = &(*p)->rb_right;
|
|
} else {
|
|
refcount_inc(&root->count);
|
|
spin_unlock(&nilfs->ns_cptree_lock);
|
|
kfree(new);
|
|
return root;
|
|
}
|
|
}
|
|
|
|
new->cno = cno;
|
|
new->ifile = NULL;
|
|
new->nilfs = nilfs;
|
|
refcount_set(&new->count, 1);
|
|
atomic64_set(&new->inodes_count, 0);
|
|
atomic64_set(&new->blocks_count, 0);
|
|
|
|
rb_link_node(&new->rb_node, parent, p);
|
|
rb_insert_color(&new->rb_node, &nilfs->ns_cptree);
|
|
|
|
spin_unlock(&nilfs->ns_cptree_lock);
|
|
|
|
err = nilfs_sysfs_create_snapshot_group(new);
|
|
if (err) {
|
|
kfree(new);
|
|
new = NULL;
|
|
}
|
|
|
|
return new;
|
|
}
|
|
|
|
void nilfs_put_root(struct nilfs_root *root)
|
|
{
|
|
struct the_nilfs *nilfs = root->nilfs;
|
|
|
|
if (refcount_dec_and_lock(&root->count, &nilfs->ns_cptree_lock)) {
|
|
rb_erase(&root->rb_node, &nilfs->ns_cptree);
|
|
spin_unlock(&nilfs->ns_cptree_lock);
|
|
|
|
nilfs_sysfs_delete_snapshot_group(root);
|
|
iput(root->ifile);
|
|
|
|
kfree(root);
|
|
}
|
|
}
|