![Zhang Qiang](/assets/img/avatar_default.png)
'ns_cno' of structure 'the_nilfs' must be protected from segment writer, in other words, the caller of nilfs_get_checkpoint should hold read lock for nilfs->ns_segctor_sem. This patch adds the lock/unlock operations in nilfs_attach_checkpoint() when calling nilfs_cpfile_get_checkpoint(). Signed-off-by: Zhang Qiang <zhangqiang.buaa@gmail.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
1254 lines
31 KiB
C
1254 lines
31 KiB
C
/*
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* super.c - NILFS module and super block management.
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Ryusuke Konishi <ryusuke@osrg.net>
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*/
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/*
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* linux/fs/ext2/super.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/parser.h>
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#include <linux/random.h>
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#include <linux/crc32.h>
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#include <linux/smp_lock.h>
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#include <linux/vfs.h>
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#include <linux/writeback.h>
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#include <linux/kobject.h>
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#include <linux/exportfs.h>
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#include "nilfs.h"
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#include "mdt.h"
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#include "alloc.h"
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#include "page.h"
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#include "cpfile.h"
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#include "ifile.h"
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#include "dat.h"
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#include "segment.h"
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#include "segbuf.h"
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MODULE_AUTHOR("NTT Corp.");
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MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
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"(NILFS)");
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MODULE_LICENSE("GPL");
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static void nilfs_write_super(struct super_block *sb);
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static int nilfs_remount(struct super_block *sb, int *flags, char *data);
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/**
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* nilfs_error() - report failure condition on a filesystem
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*
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* nilfs_error() sets an ERROR_FS flag on the superblock as well as
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* reporting an error message. It should be called when NILFS detects
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* incoherences or defects of meta data on disk. As for sustainable
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* errors such as a single-shot I/O error, nilfs_warning() or the printk()
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* function should be used instead.
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*
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* The segment constructor must not call this function because it can
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* kill itself.
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*/
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void nilfs_error(struct super_block *sb, const char *function,
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const char *fmt, ...)
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{
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struct nilfs_sb_info *sbi = NILFS_SB(sb);
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va_list args;
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va_start(args, fmt);
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printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function);
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vprintk(fmt, args);
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printk("\n");
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va_end(args);
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if (!(sb->s_flags & MS_RDONLY)) {
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struct the_nilfs *nilfs = sbi->s_nilfs;
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if (!nilfs_test_opt(sbi, ERRORS_CONT))
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nilfs_detach_segment_constructor(sbi);
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down_write(&nilfs->ns_sem);
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if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
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nilfs->ns_mount_state |= NILFS_ERROR_FS;
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nilfs->ns_sbp[0]->s_state |=
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cpu_to_le16(NILFS_ERROR_FS);
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nilfs_commit_super(sbi, 1);
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}
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up_write(&nilfs->ns_sem);
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if (nilfs_test_opt(sbi, ERRORS_RO)) {
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printk(KERN_CRIT "Remounting filesystem read-only\n");
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sb->s_flags |= MS_RDONLY;
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}
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}
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if (nilfs_test_opt(sbi, ERRORS_PANIC))
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panic("NILFS (device %s): panic forced after error\n",
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sb->s_id);
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}
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void nilfs_warning(struct super_block *sb, const char *function,
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const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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printk(KERN_WARNING "NILFS warning (device %s): %s: ",
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sb->s_id, function);
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vprintk(fmt, args);
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printk("\n");
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va_end(args);
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}
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static struct kmem_cache *nilfs_inode_cachep;
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struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
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{
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struct nilfs_inode_info *ii;
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ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
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if (!ii)
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return NULL;
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ii->i_bh = NULL;
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ii->i_state = 0;
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ii->vfs_inode.i_version = 1;
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nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi);
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return &ii->vfs_inode;
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}
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struct inode *nilfs_alloc_inode(struct super_block *sb)
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{
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return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs);
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}
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void nilfs_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
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}
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static void init_once(void *obj)
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{
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struct nilfs_inode_info *ii = obj;
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INIT_LIST_HEAD(&ii->i_dirty);
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#ifdef CONFIG_NILFS_XATTR
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init_rwsem(&ii->xattr_sem);
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#endif
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nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
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ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union;
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inode_init_once(&ii->vfs_inode);
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}
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static int nilfs_init_inode_cache(void)
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{
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nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
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sizeof(struct nilfs_inode_info),
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0, SLAB_RECLAIM_ACCOUNT,
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init_once);
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return (nilfs_inode_cachep == NULL) ? -ENOMEM : 0;
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}
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static inline void nilfs_destroy_inode_cache(void)
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{
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kmem_cache_destroy(nilfs_inode_cachep);
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}
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static void nilfs_clear_inode(struct inode *inode)
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{
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struct nilfs_inode_info *ii = NILFS_I(inode);
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/*
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* Free resources allocated in nilfs_read_inode(), here.
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*/
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BUG_ON(!list_empty(&ii->i_dirty));
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brelse(ii->i_bh);
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ii->i_bh = NULL;
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if (test_bit(NILFS_I_BMAP, &ii->i_state))
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nilfs_bmap_clear(ii->i_bmap);
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nilfs_btnode_cache_clear(&ii->i_btnode_cache);
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}
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static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb)
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{
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struct the_nilfs *nilfs = sbi->s_nilfs;
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int err;
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int barrier_done = 0;
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if (nilfs_test_opt(sbi, BARRIER)) {
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set_buffer_ordered(nilfs->ns_sbh[0]);
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barrier_done = 1;
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}
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retry:
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set_buffer_dirty(nilfs->ns_sbh[0]);
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err = sync_dirty_buffer(nilfs->ns_sbh[0]);
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if (err == -EOPNOTSUPP && barrier_done) {
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nilfs_warning(sbi->s_super, __func__,
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"barrier-based sync failed. "
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"disabling barriers\n");
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nilfs_clear_opt(sbi, BARRIER);
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barrier_done = 0;
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clear_buffer_ordered(nilfs->ns_sbh[0]);
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goto retry;
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}
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if (unlikely(err)) {
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printk(KERN_ERR
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"NILFS: unable to write superblock (err=%d)\n", err);
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if (err == -EIO && nilfs->ns_sbh[1]) {
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nilfs_fall_back_super_block(nilfs);
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goto retry;
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}
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} else {
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struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
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/*
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* The latest segment becomes trailable from the position
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* written in superblock.
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*/
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clear_nilfs_discontinued(nilfs);
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/* update GC protection for recent segments */
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if (nilfs->ns_sbh[1]) {
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sbp = NULL;
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if (dupsb) {
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set_buffer_dirty(nilfs->ns_sbh[1]);
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if (!sync_dirty_buffer(nilfs->ns_sbh[1]))
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sbp = nilfs->ns_sbp[1];
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}
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}
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if (sbp) {
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spin_lock(&nilfs->ns_last_segment_lock);
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nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
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spin_unlock(&nilfs->ns_last_segment_lock);
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}
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}
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return err;
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}
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int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb)
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{
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struct the_nilfs *nilfs = sbi->s_nilfs;
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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sector_t nfreeblocks;
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time_t t;
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int err;
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/* nilfs->sem must be locked by the caller. */
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if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) {
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if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC)
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nilfs_swap_super_block(nilfs);
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else {
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printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
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sbi->s_super->s_id);
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return -EIO;
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}
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}
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err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
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if (unlikely(err)) {
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printk(KERN_ERR "NILFS: failed to count free blocks\n");
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return err;
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}
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spin_lock(&nilfs->ns_last_segment_lock);
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sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
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sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
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sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
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spin_unlock(&nilfs->ns_last_segment_lock);
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t = get_seconds();
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nilfs->ns_sbwtime[0] = t;
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sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks);
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sbp[0]->s_wtime = cpu_to_le64(t);
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sbp[0]->s_sum = 0;
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sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
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(unsigned char *)sbp[0],
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nilfs->ns_sbsize));
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if (dupsb && sbp[1]) {
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memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
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nilfs->ns_sbwtime[1] = t;
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}
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sbi->s_super->s_dirt = 0;
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return nilfs_sync_super(sbi, dupsb);
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}
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static void nilfs_put_super(struct super_block *sb)
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{
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struct nilfs_sb_info *sbi = NILFS_SB(sb);
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struct the_nilfs *nilfs = sbi->s_nilfs;
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lock_kernel();
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if (sb->s_dirt)
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nilfs_write_super(sb);
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nilfs_detach_segment_constructor(sbi);
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if (!(sb->s_flags & MS_RDONLY)) {
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down_write(&nilfs->ns_sem);
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nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
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nilfs_commit_super(sbi, 1);
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up_write(&nilfs->ns_sem);
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}
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down_write(&nilfs->ns_super_sem);
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if (nilfs->ns_current == sbi)
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nilfs->ns_current = NULL;
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up_write(&nilfs->ns_super_sem);
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nilfs_detach_checkpoint(sbi);
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put_nilfs(sbi->s_nilfs);
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sbi->s_super = NULL;
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sb->s_fs_info = NULL;
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nilfs_put_sbinfo(sbi);
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unlock_kernel();
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}
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/**
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* nilfs_write_super - write super block(s) of NILFS
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* @sb: super_block
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*
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* nilfs_write_super() gets a fs-dependent lock, writes super block(s), and
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* clears s_dirt. This function is called in the section protected by
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* lock_super().
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*
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* The s_dirt flag is managed by each filesystem and we protect it by ns_sem
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* of the struct the_nilfs. Lock order must be as follows:
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*
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* 1. lock_super()
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* 2. down_write(&nilfs->ns_sem)
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*
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* Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer
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* of the super block (nilfs->ns_sbp[]).
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*
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* In most cases, VFS functions call lock_super() before calling these
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* methods. So we must be careful not to bring on deadlocks when using
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* lock_super(); see generic_shutdown_super(), write_super(), and so on.
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*
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* Note that order of lock_kernel() and lock_super() depends on contexts
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* of VFS. We should also note that lock_kernel() can be used in its
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* protective section and only the outermost one has an effect.
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*/
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static void nilfs_write_super(struct super_block *sb)
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{
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struct nilfs_sb_info *sbi = NILFS_SB(sb);
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struct the_nilfs *nilfs = sbi->s_nilfs;
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down_write(&nilfs->ns_sem);
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if (!(sb->s_flags & MS_RDONLY)) {
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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u64 t = get_seconds();
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int dupsb;
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if (!nilfs_discontinued(nilfs) && t >= nilfs->ns_sbwtime[0] &&
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t < nilfs->ns_sbwtime[0] + NILFS_SB_FREQ) {
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up_write(&nilfs->ns_sem);
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return;
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}
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dupsb = sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ;
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nilfs_commit_super(sbi, dupsb);
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}
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sb->s_dirt = 0;
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up_write(&nilfs->ns_sem);
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}
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static int nilfs_sync_fs(struct super_block *sb, int wait)
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{
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int err = 0;
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nilfs_write_super(sb);
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/* This function is called when super block should be written back */
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if (wait)
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err = nilfs_construct_segment(sb);
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return err;
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}
|
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|
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int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
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{
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struct the_nilfs *nilfs = sbi->s_nilfs;
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struct nilfs_checkpoint *raw_cp;
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struct buffer_head *bh_cp;
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int err;
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down_write(&nilfs->ns_super_sem);
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list_add(&sbi->s_list, &nilfs->ns_supers);
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up_write(&nilfs->ns_super_sem);
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sbi->s_ifile = nilfs_mdt_new(
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nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP);
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if (!sbi->s_ifile)
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return -ENOMEM;
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|
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err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size);
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if (unlikely(err))
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goto failed;
|
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|
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down_read(&nilfs->ns_segctor_sem);
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err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
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&bh_cp);
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up_read(&nilfs->ns_segctor_sem);
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if (unlikely(err)) {
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if (err == -ENOENT || err == -EINVAL) {
|
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printk(KERN_ERR
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"NILFS: Invalid checkpoint "
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"(checkpoint number=%llu)\n",
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(unsigned long long)cno);
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err = -EINVAL;
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}
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goto failed;
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}
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err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode);
|
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if (unlikely(err))
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goto failed_bh;
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atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
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atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
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|
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nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
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return 0;
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|
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failed_bh:
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nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
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failed:
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nilfs_mdt_destroy(sbi->s_ifile);
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sbi->s_ifile = NULL;
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down_write(&nilfs->ns_super_sem);
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list_del_init(&sbi->s_list);
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up_write(&nilfs->ns_super_sem);
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|
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return err;
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}
|
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|
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void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi)
|
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{
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struct the_nilfs *nilfs = sbi->s_nilfs;
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|
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nilfs_mdt_clear(sbi->s_ifile);
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nilfs_mdt_destroy(sbi->s_ifile);
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sbi->s_ifile = NULL;
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down_write(&nilfs->ns_super_sem);
|
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list_del_init(&sbi->s_list);
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up_write(&nilfs->ns_super_sem);
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}
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|
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static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi)
|
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{
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
int err = 0;
|
|
|
|
down_write(&nilfs->ns_sem);
|
|
if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
|
|
nilfs->ns_mount_state |= NILFS_VALID_FS;
|
|
err = nilfs_commit_super(sbi, 1);
|
|
if (likely(!err))
|
|
printk(KERN_INFO "NILFS: recovery complete.\n");
|
|
}
|
|
up_write(&nilfs->ns_sem);
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
unsigned long long blocks;
|
|
unsigned long overhead;
|
|
unsigned long nrsvblocks;
|
|
sector_t nfreeblocks;
|
|
int err;
|
|
|
|
/*
|
|
* Compute all of the segment blocks
|
|
*
|
|
* The blocks before first segment and after last segment
|
|
* are excluded.
|
|
*/
|
|
blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
|
|
- nilfs->ns_first_data_block;
|
|
nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
|
|
|
|
/*
|
|
* Compute the overhead
|
|
*
|
|
* When distributing meta data blocks outside semgent structure,
|
|
* We must count them as the overhead.
|
|
*/
|
|
overhead = 0;
|
|
|
|
err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
buf->f_type = NILFS_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = blocks - overhead;
|
|
buf->f_bfree = nfreeblocks;
|
|
buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
|
|
(buf->f_bfree - nrsvblocks) : 0;
|
|
buf->f_files = atomic_read(&sbi->s_inodes_count);
|
|
buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
|
|
buf->f_namelen = NILFS_NAME_LEN;
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct super_operations nilfs_sops = {
|
|
.alloc_inode = nilfs_alloc_inode,
|
|
.destroy_inode = nilfs_destroy_inode,
|
|
.dirty_inode = nilfs_dirty_inode,
|
|
/* .write_inode = nilfs_write_inode, */
|
|
/* .put_inode = nilfs_put_inode, */
|
|
/* .drop_inode = nilfs_drop_inode, */
|
|
.delete_inode = nilfs_delete_inode,
|
|
.put_super = nilfs_put_super,
|
|
.write_super = nilfs_write_super,
|
|
.sync_fs = nilfs_sync_fs,
|
|
/* .write_super_lockfs */
|
|
/* .unlockfs */
|
|
.statfs = nilfs_statfs,
|
|
.remount_fs = nilfs_remount,
|
|
.clear_inode = nilfs_clear_inode,
|
|
/* .umount_begin */
|
|
/* .show_options */
|
|
};
|
|
|
|
static struct inode *
|
|
nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
|
|
{
|
|
struct inode *inode;
|
|
|
|
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
|
|
ino != NILFS_SKETCH_INO)
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
inode = nilfs_iget(sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
if (generation && inode->i_generation != generation) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
static struct dentry *
|
|
nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
|
|
int fh_type)
|
|
{
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
|
nilfs_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *
|
|
nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len,
|
|
int fh_type)
|
|
{
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
|
nilfs_nfs_get_inode);
|
|
}
|
|
|
|
static struct export_operations nilfs_export_ops = {
|
|
.fh_to_dentry = nilfs_fh_to_dentry,
|
|
.fh_to_parent = nilfs_fh_to_parent,
|
|
.get_parent = nilfs_get_parent,
|
|
};
|
|
|
|
enum {
|
|
Opt_err_cont, Opt_err_panic, Opt_err_ro,
|
|
Opt_barrier, Opt_snapshot, Opt_order,
|
|
Opt_err,
|
|
};
|
|
|
|
static match_table_t tokens = {
|
|
{Opt_err_cont, "errors=continue"},
|
|
{Opt_err_panic, "errors=panic"},
|
|
{Opt_err_ro, "errors=remount-ro"},
|
|
{Opt_barrier, "barrier=%s"},
|
|
{Opt_snapshot, "cp=%u"},
|
|
{Opt_order, "order=%s"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static int match_bool(substring_t *s, int *result)
|
|
{
|
|
int len = s->to - s->from;
|
|
|
|
if (strncmp(s->from, "on", len) == 0)
|
|
*result = 1;
|
|
else if (strncmp(s->from, "off", len) == 0)
|
|
*result = 0;
|
|
else
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int parse_options(char *options, struct super_block *sb)
|
|
{
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
|
|
if (!options)
|
|
return 1;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case Opt_barrier:
|
|
if (match_bool(&args[0], &option))
|
|
return 0;
|
|
if (option)
|
|
nilfs_set_opt(sbi, BARRIER);
|
|
else
|
|
nilfs_clear_opt(sbi, BARRIER);
|
|
break;
|
|
case Opt_order:
|
|
if (strcmp(args[0].from, "relaxed") == 0)
|
|
/* Ordered data semantics */
|
|
nilfs_clear_opt(sbi, STRICT_ORDER);
|
|
else if (strcmp(args[0].from, "strict") == 0)
|
|
/* Strict in-order semantics */
|
|
nilfs_set_opt(sbi, STRICT_ORDER);
|
|
else
|
|
return 0;
|
|
break;
|
|
case Opt_err_panic:
|
|
nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC);
|
|
break;
|
|
case Opt_err_ro:
|
|
nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO);
|
|
break;
|
|
case Opt_err_cont:
|
|
nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT);
|
|
break;
|
|
case Opt_snapshot:
|
|
if (match_int(&args[0], &option) || option <= 0)
|
|
return 0;
|
|
if (!(sb->s_flags & MS_RDONLY))
|
|
return 0;
|
|
sbi->s_snapshot_cno = option;
|
|
nilfs_set_opt(sbi, SNAPSHOT);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR
|
|
"NILFS: Unrecognized mount option \"%s\"\n", p);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static inline void
|
|
nilfs_set_default_options(struct nilfs_sb_info *sbi,
|
|
struct nilfs_super_block *sbp)
|
|
{
|
|
sbi->s_mount_opt =
|
|
NILFS_MOUNT_ERRORS_CONT | NILFS_MOUNT_BARRIER;
|
|
}
|
|
|
|
static int nilfs_setup_super(struct nilfs_sb_info *sbi)
|
|
{
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
|
|
int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count);
|
|
int mnt_count = le16_to_cpu(sbp->s_mnt_count);
|
|
|
|
/* nilfs->sem must be locked by the caller. */
|
|
if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
|
|
printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n");
|
|
} else if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
|
|
printk(KERN_WARNING
|
|
"NILFS warning: mounting fs with errors\n");
|
|
#if 0
|
|
} else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
|
|
printk(KERN_WARNING
|
|
"NILFS warning: maximal mount count reached\n");
|
|
#endif
|
|
}
|
|
if (!max_mnt_count)
|
|
sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
|
|
|
|
sbp->s_mnt_count = cpu_to_le16(mnt_count + 1);
|
|
sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS);
|
|
sbp->s_mtime = cpu_to_le64(get_seconds());
|
|
return nilfs_commit_super(sbi, 1);
|
|
}
|
|
|
|
struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
|
|
u64 pos, int blocksize,
|
|
struct buffer_head **pbh)
|
|
{
|
|
unsigned long long sb_index = pos;
|
|
unsigned long offset;
|
|
|
|
offset = do_div(sb_index, blocksize);
|
|
*pbh = sb_bread(sb, sb_index);
|
|
if (!*pbh)
|
|
return NULL;
|
|
return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
|
|
}
|
|
|
|
int nilfs_store_magic_and_option(struct super_block *sb,
|
|
struct nilfs_super_block *sbp,
|
|
char *data)
|
|
{
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
|
|
sb->s_magic = le16_to_cpu(sbp->s_magic);
|
|
|
|
/* FS independent flags */
|
|
#ifdef NILFS_ATIME_DISABLE
|
|
sb->s_flags |= MS_NOATIME;
|
|
#endif
|
|
|
|
nilfs_set_default_options(sbi, sbp);
|
|
|
|
sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid);
|
|
sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid);
|
|
sbi->s_interval = le32_to_cpu(sbp->s_c_interval);
|
|
sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max);
|
|
|
|
return !parse_options(data, sb) ? -EINVAL : 0 ;
|
|
}
|
|
|
|
/**
|
|
* nilfs_fill_super() - initialize a super block instance
|
|
* @sb: super_block
|
|
* @data: mount options
|
|
* @silent: silent mode flag
|
|
* @nilfs: the_nilfs struct
|
|
*
|
|
* This function is called exclusively by nilfs->ns_mount_mutex.
|
|
* So, the recovery process is protected from other simultaneous mounts.
|
|
*/
|
|
static int
|
|
nilfs_fill_super(struct super_block *sb, void *data, int silent,
|
|
struct the_nilfs *nilfs)
|
|
{
|
|
struct nilfs_sb_info *sbi;
|
|
struct inode *root;
|
|
__u64 cno;
|
|
int err;
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
sb->s_fs_info = sbi;
|
|
|
|
get_nilfs(nilfs);
|
|
sbi->s_nilfs = nilfs;
|
|
sbi->s_super = sb;
|
|
atomic_set(&sbi->s_count, 1);
|
|
|
|
err = init_nilfs(nilfs, sbi, (char *)data);
|
|
if (err)
|
|
goto failed_sbi;
|
|
|
|
spin_lock_init(&sbi->s_inode_lock);
|
|
INIT_LIST_HEAD(&sbi->s_dirty_files);
|
|
INIT_LIST_HEAD(&sbi->s_list);
|
|
|
|
/*
|
|
* Following initialization is overlapped because
|
|
* nilfs_sb_info structure has been cleared at the beginning.
|
|
* But we reserve them to keep our interest and make ready
|
|
* for the future change.
|
|
*/
|
|
get_random_bytes(&sbi->s_next_generation,
|
|
sizeof(sbi->s_next_generation));
|
|
spin_lock_init(&sbi->s_next_gen_lock);
|
|
|
|
sb->s_op = &nilfs_sops;
|
|
sb->s_export_op = &nilfs_export_ops;
|
|
sb->s_root = NULL;
|
|
sb->s_time_gran = 1;
|
|
|
|
if (!nilfs_loaded(nilfs)) {
|
|
err = load_nilfs(nilfs, sbi);
|
|
if (err)
|
|
goto failed_sbi;
|
|
}
|
|
cno = nilfs_last_cno(nilfs);
|
|
|
|
if (sb->s_flags & MS_RDONLY) {
|
|
if (nilfs_test_opt(sbi, SNAPSHOT)) {
|
|
err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
|
|
sbi->s_snapshot_cno);
|
|
if (err < 0)
|
|
goto failed_sbi;
|
|
if (!err) {
|
|
printk(KERN_ERR
|
|
"NILFS: The specified checkpoint is "
|
|
"not a snapshot "
|
|
"(checkpoint number=%llu).\n",
|
|
(unsigned long long)sbi->s_snapshot_cno);
|
|
err = -EINVAL;
|
|
goto failed_sbi;
|
|
}
|
|
cno = sbi->s_snapshot_cno;
|
|
} else
|
|
/* Read-only mount */
|
|
sbi->s_snapshot_cno = cno;
|
|
}
|
|
|
|
err = nilfs_attach_checkpoint(sbi, cno);
|
|
if (err) {
|
|
printk(KERN_ERR "NILFS: error loading a checkpoint"
|
|
" (checkpoint number=%llu).\n", (unsigned long long)cno);
|
|
goto failed_sbi;
|
|
}
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
err = nilfs_attach_segment_constructor(sbi);
|
|
if (err)
|
|
goto failed_checkpoint;
|
|
}
|
|
|
|
root = nilfs_iget(sb, NILFS_ROOT_INO);
|
|
if (IS_ERR(root)) {
|
|
printk(KERN_ERR "NILFS: get root inode failed\n");
|
|
err = PTR_ERR(root);
|
|
goto failed_segctor;
|
|
}
|
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
|
|
iput(root);
|
|
printk(KERN_ERR "NILFS: corrupt root inode.\n");
|
|
err = -EINVAL;
|
|
goto failed_segctor;
|
|
}
|
|
sb->s_root = d_alloc_root(root);
|
|
if (!sb->s_root) {
|
|
iput(root);
|
|
printk(KERN_ERR "NILFS: get root dentry failed\n");
|
|
err = -ENOMEM;
|
|
goto failed_segctor;
|
|
}
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs_setup_super(sbi);
|
|
up_write(&nilfs->ns_sem);
|
|
}
|
|
|
|
err = nilfs_mark_recovery_complete(sbi);
|
|
if (unlikely(err)) {
|
|
printk(KERN_ERR "NILFS: recovery failed.\n");
|
|
goto failed_root;
|
|
}
|
|
|
|
down_write(&nilfs->ns_super_sem);
|
|
if (!nilfs_test_opt(sbi, SNAPSHOT))
|
|
nilfs->ns_current = sbi;
|
|
up_write(&nilfs->ns_super_sem);
|
|
|
|
return 0;
|
|
|
|
failed_root:
|
|
dput(sb->s_root);
|
|
sb->s_root = NULL;
|
|
|
|
failed_segctor:
|
|
nilfs_detach_segment_constructor(sbi);
|
|
|
|
failed_checkpoint:
|
|
nilfs_detach_checkpoint(sbi);
|
|
|
|
failed_sbi:
|
|
put_nilfs(nilfs);
|
|
sb->s_fs_info = NULL;
|
|
nilfs_put_sbinfo(sbi);
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
struct nilfs_super_block *sbp;
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
unsigned long old_sb_flags;
|
|
struct nilfs_mount_options old_opts;
|
|
int err;
|
|
|
|
lock_kernel();
|
|
|
|
down_write(&nilfs->ns_super_sem);
|
|
old_sb_flags = sb->s_flags;
|
|
old_opts.mount_opt = sbi->s_mount_opt;
|
|
old_opts.snapshot_cno = sbi->s_snapshot_cno;
|
|
|
|
if (!parse_options(data, sb)) {
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
|
|
|
|
if ((*flags & MS_RDONLY) &&
|
|
sbi->s_snapshot_cno != old_opts.snapshot_cno) {
|
|
printk(KERN_WARNING "NILFS (device %s): couldn't "
|
|
"remount to a different snapshot. \n",
|
|
sb->s_id);
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
|
|
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
|
|
goto out;
|
|
if (*flags & MS_RDONLY) {
|
|
/* Shutting down the segment constructor */
|
|
nilfs_detach_segment_constructor(sbi);
|
|
sb->s_flags |= MS_RDONLY;
|
|
|
|
sbi->s_snapshot_cno = nilfs_last_cno(nilfs);
|
|
/* nilfs_set_opt(sbi, SNAPSHOT); */
|
|
|
|
/*
|
|
* Remounting a valid RW partition RDONLY, so set
|
|
* the RDONLY flag and then mark the partition as valid again.
|
|
*/
|
|
down_write(&nilfs->ns_sem);
|
|
sbp = nilfs->ns_sbp[0];
|
|
if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) &&
|
|
(nilfs->ns_mount_state & NILFS_VALID_FS))
|
|
sbp->s_state = cpu_to_le16(nilfs->ns_mount_state);
|
|
sbp->s_mtime = cpu_to_le64(get_seconds());
|
|
nilfs_commit_super(sbi, 1);
|
|
up_write(&nilfs->ns_sem);
|
|
} else {
|
|
/*
|
|
* Mounting a RDONLY partition read-write, so reread and
|
|
* store the current valid flag. (It may have been changed
|
|
* by fsck since we originally mounted the partition.)
|
|
*/
|
|
if (nilfs->ns_current && nilfs->ns_current != sbi) {
|
|
printk(KERN_WARNING "NILFS (device %s): couldn't "
|
|
"remount because an RW-mount exists.\n",
|
|
sb->s_id);
|
|
err = -EBUSY;
|
|
goto restore_opts;
|
|
}
|
|
if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) {
|
|
printk(KERN_WARNING "NILFS (device %s): couldn't "
|
|
"remount because the current RO-mount is not "
|
|
"the latest one.\n",
|
|
sb->s_id);
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
sb->s_flags &= ~MS_RDONLY;
|
|
nilfs_clear_opt(sbi, SNAPSHOT);
|
|
sbi->s_snapshot_cno = 0;
|
|
|
|
err = nilfs_attach_segment_constructor(sbi);
|
|
if (err)
|
|
goto restore_opts;
|
|
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs_setup_super(sbi);
|
|
up_write(&nilfs->ns_sem);
|
|
|
|
nilfs->ns_current = sbi;
|
|
}
|
|
out:
|
|
up_write(&nilfs->ns_super_sem);
|
|
unlock_kernel();
|
|
return 0;
|
|
|
|
restore_opts:
|
|
sb->s_flags = old_sb_flags;
|
|
sbi->s_mount_opt = old_opts.mount_opt;
|
|
sbi->s_snapshot_cno = old_opts.snapshot_cno;
|
|
up_write(&nilfs->ns_super_sem);
|
|
unlock_kernel();
|
|
return err;
|
|
}
|
|
|
|
struct nilfs_super_data {
|
|
struct block_device *bdev;
|
|
struct nilfs_sb_info *sbi;
|
|
__u64 cno;
|
|
int flags;
|
|
};
|
|
|
|
/**
|
|
* nilfs_identify - pre-read mount options needed to identify mount instance
|
|
* @data: mount options
|
|
* @sd: nilfs_super_data
|
|
*/
|
|
static int nilfs_identify(char *data, struct nilfs_super_data *sd)
|
|
{
|
|
char *p, *options = data;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option, token;
|
|
int ret = 0;
|
|
|
|
do {
|
|
p = strsep(&options, ",");
|
|
if (p != NULL && *p) {
|
|
token = match_token(p, tokens, args);
|
|
if (token == Opt_snapshot) {
|
|
if (!(sd->flags & MS_RDONLY))
|
|
ret++;
|
|
else {
|
|
ret = match_int(&args[0], &option);
|
|
if (!ret) {
|
|
if (option > 0)
|
|
sd->cno = option;
|
|
else
|
|
ret++;
|
|
}
|
|
}
|
|
}
|
|
if (ret)
|
|
printk(KERN_ERR
|
|
"NILFS: invalid mount option: %s\n", p);
|
|
}
|
|
if (!options)
|
|
break;
|
|
BUG_ON(options == data);
|
|
*(options - 1) = ',';
|
|
} while (!ret);
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_set_bdev_super(struct super_block *s, void *data)
|
|
{
|
|
struct nilfs_super_data *sd = data;
|
|
|
|
s->s_bdev = sd->bdev;
|
|
s->s_dev = s->s_bdev->bd_dev;
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_test_bdev_super(struct super_block *s, void *data)
|
|
{
|
|
struct nilfs_super_data *sd = data;
|
|
|
|
return sd->sbi && s->s_fs_info == (void *)sd->sbi;
|
|
}
|
|
|
|
static int
|
|
nilfs_get_sb(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
struct nilfs_super_data sd;
|
|
struct super_block *s;
|
|
struct the_nilfs *nilfs;
|
|
int err, need_to_close = 1;
|
|
|
|
sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type);
|
|
if (IS_ERR(sd.bdev))
|
|
return PTR_ERR(sd.bdev);
|
|
|
|
/*
|
|
* To get mount instance using sget() vfs-routine, NILFS needs
|
|
* much more information than normal filesystems to identify mount
|
|
* instance. For snapshot mounts, not only a mount type (ro-mount
|
|
* or rw-mount) but also a checkpoint number is required.
|
|
*/
|
|
sd.cno = 0;
|
|
sd.flags = flags;
|
|
if (nilfs_identify((char *)data, &sd)) {
|
|
err = -EINVAL;
|
|
goto failed;
|
|
}
|
|
|
|
nilfs = find_or_create_nilfs(sd.bdev);
|
|
if (!nilfs) {
|
|
err = -ENOMEM;
|
|
goto failed;
|
|
}
|
|
|
|
mutex_lock(&nilfs->ns_mount_mutex);
|
|
|
|
if (!sd.cno) {
|
|
/*
|
|
* Check if an exclusive mount exists or not.
|
|
* Snapshot mounts coexist with a current mount
|
|
* (i.e. rw-mount or ro-mount), whereas rw-mount and
|
|
* ro-mount are mutually exclusive.
|
|
*/
|
|
down_read(&nilfs->ns_super_sem);
|
|
if (nilfs->ns_current &&
|
|
((nilfs->ns_current->s_super->s_flags ^ flags)
|
|
& MS_RDONLY)) {
|
|
up_read(&nilfs->ns_super_sem);
|
|
err = -EBUSY;
|
|
goto failed_unlock;
|
|
}
|
|
up_read(&nilfs->ns_super_sem);
|
|
}
|
|
|
|
/*
|
|
* Find existing nilfs_sb_info struct
|
|
*/
|
|
sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno);
|
|
|
|
if (!sd.cno)
|
|
/* trying to get the latest checkpoint. */
|
|
sd.cno = nilfs_last_cno(nilfs);
|
|
|
|
/*
|
|
* Get super block instance holding the nilfs_sb_info struct.
|
|
* A new instance is allocated if no existing mount is present or
|
|
* existing instance has been unmounted.
|
|
*/
|
|
s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd);
|
|
if (sd.sbi)
|
|
nilfs_put_sbinfo(sd.sbi);
|
|
|
|
if (IS_ERR(s)) {
|
|
err = PTR_ERR(s);
|
|
goto failed_unlock;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
/* New superblock instance created */
|
|
s->s_flags = flags;
|
|
strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
|
|
sb_set_blocksize(s, block_size(sd.bdev));
|
|
|
|
err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs);
|
|
if (err)
|
|
goto cancel_new;
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
need_to_close = 0;
|
|
}
|
|
|
|
mutex_unlock(&nilfs->ns_mount_mutex);
|
|
put_nilfs(nilfs);
|
|
if (need_to_close)
|
|
close_bdev_exclusive(sd.bdev, flags);
|
|
simple_set_mnt(mnt, s);
|
|
return 0;
|
|
|
|
failed_unlock:
|
|
mutex_unlock(&nilfs->ns_mount_mutex);
|
|
put_nilfs(nilfs);
|
|
failed:
|
|
close_bdev_exclusive(sd.bdev, flags);
|
|
|
|
return err;
|
|
|
|
cancel_new:
|
|
/* Abandoning the newly allocated superblock */
|
|
mutex_unlock(&nilfs->ns_mount_mutex);
|
|
put_nilfs(nilfs);
|
|
up_write(&s->s_umount);
|
|
deactivate_super(s);
|
|
/*
|
|
* deactivate_super() invokes close_bdev_exclusive().
|
|
* We must finish all post-cleaning before this call;
|
|
* put_nilfs() needs the block device.
|
|
*/
|
|
return err;
|
|
}
|
|
|
|
struct file_system_type nilfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "nilfs2",
|
|
.get_sb = nilfs_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_nilfs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
err = nilfs_init_inode_cache();
|
|
if (err)
|
|
goto failed;
|
|
|
|
err = nilfs_init_transaction_cache();
|
|
if (err)
|
|
goto failed_inode_cache;
|
|
|
|
err = nilfs_init_segbuf_cache();
|
|
if (err)
|
|
goto failed_transaction_cache;
|
|
|
|
err = nilfs_btree_path_cache_init();
|
|
if (err)
|
|
goto failed_segbuf_cache;
|
|
|
|
err = register_filesystem(&nilfs_fs_type);
|
|
if (err)
|
|
goto failed_btree_path_cache;
|
|
|
|
return 0;
|
|
|
|
failed_btree_path_cache:
|
|
nilfs_btree_path_cache_destroy();
|
|
|
|
failed_segbuf_cache:
|
|
nilfs_destroy_segbuf_cache();
|
|
|
|
failed_transaction_cache:
|
|
nilfs_destroy_transaction_cache();
|
|
|
|
failed_inode_cache:
|
|
nilfs_destroy_inode_cache();
|
|
|
|
failed:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_nilfs_fs(void)
|
|
{
|
|
nilfs_destroy_segbuf_cache();
|
|
nilfs_destroy_transaction_cache();
|
|
nilfs_destroy_inode_cache();
|
|
nilfs_btree_path_cache_destroy();
|
|
unregister_filesystem(&nilfs_fs_type);
|
|
}
|
|
|
|
module_init(init_nilfs_fs)
|
|
module_exit(exit_nilfs_fs)
|