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6d1349c769
Get rid of boilerplate in most of ->statfs() instances... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1474 lines
35 KiB
C
1474 lines
35 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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* Written by Ryusuke Konishi.
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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/crc32.h>
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#include <linux/vfs.h>
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#include <linux/writeback.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include "nilfs.h"
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#include "export.h"
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#include "mdt.h"
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#include "alloc.h"
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#include "btree.h"
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#include "btnode.h"
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#include "page.h"
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#include "cpfile.h"
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#include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */
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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 struct kmem_cache *nilfs_inode_cachep;
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struct kmem_cache *nilfs_transaction_cachep;
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struct kmem_cache *nilfs_segbuf_cachep;
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struct kmem_cache *nilfs_btree_path_cache;
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static int nilfs_setup_super(struct super_block *sb, int is_mount);
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static int nilfs_remount(struct super_block *sb, int *flags, char *data);
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void __nilfs_msg(struct super_block *sb, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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int level;
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va_start(args, fmt);
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level = printk_get_level(fmt);
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vaf.fmt = printk_skip_level(fmt);
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vaf.va = &args;
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if (sb)
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printk("%c%cNILFS (%s): %pV\n",
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KERN_SOH_ASCII, level, sb->s_id, &vaf);
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else
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printk("%c%cNILFS: %pV\n",
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KERN_SOH_ASCII, level, &vaf);
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va_end(args);
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}
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static void nilfs_set_error(struct super_block *sb)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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struct nilfs_super_block **sbp;
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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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sbp = nilfs_prepare_super(sb, 0);
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if (likely(sbp)) {
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sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
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if (sbp[1])
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sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
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nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
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}
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}
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up_write(&nilfs->ns_sem);
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}
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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. This function should be called when
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* NILFS detects incoherences or defects of meta data on disk.
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*
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* This implements the body of nilfs_error() macro. Normally,
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* nilfs_error() should be used. As for sustainable errors such as a
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* single-shot I/O error, nilfs_err() should be used instead.
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*
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* Callers should not add a trailing newline since this will do it.
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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 the_nilfs *nilfs = sb->s_fs_info;
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n",
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sb->s_id, function, &vaf);
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va_end(args);
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if (!sb_rdonly(sb)) {
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nilfs_set_error(sb);
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if (nilfs_test_opt(nilfs, ERRORS_RO)) {
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printk(KERN_CRIT "Remounting filesystem read-only\n");
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sb->s_flags |= SB_RDONLY;
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}
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}
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if (nilfs_test_opt(nilfs, 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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struct inode *nilfs_alloc_inode(struct super_block *sb)
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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->i_cno = 0;
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nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode);
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return &ii->vfs_inode;
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}
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static void nilfs_free_inode(struct inode *inode)
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{
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if (nilfs_is_metadata_file_inode(inode))
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nilfs_mdt_destroy(inode);
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kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
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}
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static int nilfs_sync_super(struct super_block *sb, int flag)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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int err;
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retry:
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set_buffer_dirty(nilfs->ns_sbh[0]);
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if (nilfs_test_opt(nilfs, BARRIER)) {
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err = __sync_dirty_buffer(nilfs->ns_sbh[0],
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REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
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} else {
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err = sync_dirty_buffer(nilfs->ns_sbh[0]);
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}
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if (unlikely(err)) {
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nilfs_err(sb, "unable to write superblock: err=%d", err);
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if (err == -EIO && nilfs->ns_sbh[1]) {
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/*
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* sbp[0] points to newer log than sbp[1],
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* so copy sbp[0] to sbp[1] to take over sbp[0].
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*/
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memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0],
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nilfs->ns_sbsize);
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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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nilfs->ns_sbwcount++;
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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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if (flag == NILFS_SB_COMMIT_ALL) {
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set_buffer_dirty(nilfs->ns_sbh[1]);
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if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0)
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goto out;
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}
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if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) <
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le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno))
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sbp = nilfs->ns_sbp[1];
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}
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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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out:
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return err;
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}
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void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
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struct the_nilfs *nilfs)
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{
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sector_t nfreeblocks;
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/* nilfs->ns_sem must be locked by the caller. */
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nilfs_count_free_blocks(nilfs, &nfreeblocks);
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sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
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spin_lock(&nilfs->ns_last_segment_lock);
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sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
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sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
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sbp->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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}
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struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
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int flip)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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/* nilfs->ns_sem must be locked by the caller. */
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if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
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if (sbp[1] &&
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sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
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memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
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} else {
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nilfs_crit(sb, "superblock broke");
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return NULL;
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}
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} else if (sbp[1] &&
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sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
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memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
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}
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if (flip && sbp[1])
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nilfs_swap_super_block(nilfs);
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return sbp;
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}
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int nilfs_commit_super(struct super_block *sb, int flag)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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time64_t t;
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/* nilfs->ns_sem must be locked by the caller. */
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t = ktime_get_real_seconds();
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nilfs->ns_sbwtime = t;
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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 (flag == NILFS_SB_COMMIT_ALL && sbp[1]) {
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sbp[1]->s_wtime = sbp[0]->s_wtime;
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sbp[1]->s_sum = 0;
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sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
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(unsigned char *)sbp[1],
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nilfs->ns_sbsize));
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}
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clear_nilfs_sb_dirty(nilfs);
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nilfs->ns_flushed_device = 1;
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/* make sure store to ns_flushed_device cannot be reordered */
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smp_wmb();
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return nilfs_sync_super(sb, flag);
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}
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/**
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* nilfs_cleanup_super() - write filesystem state for cleanup
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* @sb: super block instance to be unmounted or degraded to read-only
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*
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* This function restores state flags in the on-disk super block.
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* This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
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* filesystem was not clean previously.
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*/
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int nilfs_cleanup_super(struct super_block *sb)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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struct nilfs_super_block **sbp;
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int flag = NILFS_SB_COMMIT;
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int ret = -EIO;
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sbp = nilfs_prepare_super(sb, 0);
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if (sbp) {
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sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
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nilfs_set_log_cursor(sbp[0], nilfs);
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if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) {
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/*
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* make the "clean" flag also to the opposite
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* super block if both super blocks point to
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* the same checkpoint.
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*/
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sbp[1]->s_state = sbp[0]->s_state;
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flag = NILFS_SB_COMMIT_ALL;
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}
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ret = nilfs_commit_super(sb, flag);
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}
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return ret;
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}
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/**
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* nilfs_move_2nd_super - relocate secondary super block
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* @sb: super block instance
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* @sb2off: new offset of the secondary super block (in bytes)
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*/
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static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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struct buffer_head *nsbh;
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struct nilfs_super_block *nsbp;
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sector_t blocknr, newblocknr;
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unsigned long offset;
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int sb2i; /* array index of the secondary superblock */
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int ret = 0;
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/* nilfs->ns_sem must be locked by the caller. */
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if (nilfs->ns_sbh[1] &&
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nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) {
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sb2i = 1;
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blocknr = nilfs->ns_sbh[1]->b_blocknr;
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} else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) {
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sb2i = 0;
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blocknr = nilfs->ns_sbh[0]->b_blocknr;
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} else {
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sb2i = -1;
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blocknr = 0;
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}
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if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off)
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goto out; /* super block location is unchanged */
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/* Get new super block buffer */
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newblocknr = sb2off >> nilfs->ns_blocksize_bits;
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offset = sb2off & (nilfs->ns_blocksize - 1);
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nsbh = sb_getblk(sb, newblocknr);
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if (!nsbh) {
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nilfs_warn(sb,
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"unable to move secondary superblock to block %llu",
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(unsigned long long)newblocknr);
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ret = -EIO;
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goto out;
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}
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nsbp = (void *)nsbh->b_data + offset;
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memset(nsbp, 0, nilfs->ns_blocksize);
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if (sb2i >= 0) {
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memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
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brelse(nilfs->ns_sbh[sb2i]);
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nilfs->ns_sbh[sb2i] = nsbh;
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nilfs->ns_sbp[sb2i] = nsbp;
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} else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) {
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/* secondary super block will be restored to index 1 */
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nilfs->ns_sbh[1] = nsbh;
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nilfs->ns_sbp[1] = nsbp;
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} else {
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brelse(nsbh);
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}
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out:
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return ret;
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}
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/**
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* nilfs_resize_fs - resize the filesystem
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* @sb: super block instance
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* @newsize: new size of the filesystem (in bytes)
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*/
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int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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struct nilfs_super_block **sbp;
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__u64 devsize, newnsegs;
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loff_t sb2off;
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int ret;
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ret = -ERANGE;
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devsize = i_size_read(sb->s_bdev->bd_inode);
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if (newsize > devsize)
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goto out;
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/*
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* Write lock is required to protect some functions depending
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* on the number of segments, the number of reserved segments,
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* and so forth.
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*/
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down_write(&nilfs->ns_segctor_sem);
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sb2off = NILFS_SB2_OFFSET_BYTES(newsize);
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newnsegs = sb2off >> nilfs->ns_blocksize_bits;
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do_div(newnsegs, nilfs->ns_blocks_per_segment);
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ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs);
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up_write(&nilfs->ns_segctor_sem);
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if (ret < 0)
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goto out;
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ret = nilfs_construct_segment(sb);
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if (ret < 0)
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goto out;
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down_write(&nilfs->ns_sem);
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nilfs_move_2nd_super(sb, sb2off);
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ret = -EIO;
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sbp = nilfs_prepare_super(sb, 0);
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if (likely(sbp)) {
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nilfs_set_log_cursor(sbp[0], nilfs);
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/*
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* Drop NILFS_RESIZE_FS flag for compatibility with
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* mount-time resize which may be implemented in a
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* future release.
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*/
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sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) &
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~NILFS_RESIZE_FS);
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sbp[0]->s_dev_size = cpu_to_le64(newsize);
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sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments);
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if (sbp[1])
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memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
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ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
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}
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up_write(&nilfs->ns_sem);
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/*
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* Reset the range of allocatable segments last. This order
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* is important in the case of expansion because the secondary
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* superblock must be protected from log write until migration
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* completes.
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*/
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if (!ret)
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nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1);
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out:
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return ret;
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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 the_nilfs *nilfs = sb->s_fs_info;
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|
nilfs_detach_log_writer(sb);
|
|
|
|
if (!sb_rdonly(sb)) {
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs_cleanup_super(sb);
|
|
up_write(&nilfs->ns_sem);
|
|
}
|
|
|
|
iput(nilfs->ns_sufile);
|
|
iput(nilfs->ns_cpfile);
|
|
iput(nilfs->ns_dat);
|
|
|
|
destroy_nilfs(nilfs);
|
|
sb->s_fs_info = NULL;
|
|
}
|
|
|
|
static int nilfs_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
struct nilfs_super_block **sbp;
|
|
int err = 0;
|
|
|
|
/* This function is called when super block should be written back */
|
|
if (wait)
|
|
err = nilfs_construct_segment(sb);
|
|
|
|
down_write(&nilfs->ns_sem);
|
|
if (nilfs_sb_dirty(nilfs)) {
|
|
sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs));
|
|
if (likely(sbp)) {
|
|
nilfs_set_log_cursor(sbp[0], nilfs);
|
|
nilfs_commit_super(sb, NILFS_SB_COMMIT);
|
|
}
|
|
}
|
|
up_write(&nilfs->ns_sem);
|
|
|
|
if (!err)
|
|
err = nilfs_flush_device(nilfs);
|
|
|
|
return err;
|
|
}
|
|
|
|
int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
|
|
struct nilfs_root **rootp)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
struct nilfs_root *root;
|
|
struct nilfs_checkpoint *raw_cp;
|
|
struct buffer_head *bh_cp;
|
|
int err = -ENOMEM;
|
|
|
|
root = nilfs_find_or_create_root(
|
|
nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
|
|
if (!root)
|
|
return err;
|
|
|
|
if (root->ifile)
|
|
goto reuse; /* already attached checkpoint */
|
|
|
|
down_read(&nilfs->ns_segctor_sem);
|
|
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
|
|
&bh_cp);
|
|
up_read(&nilfs->ns_segctor_sem);
|
|
if (unlikely(err)) {
|
|
if (err == -ENOENT || err == -EINVAL) {
|
|
nilfs_err(sb,
|
|
"Invalid checkpoint (checkpoint number=%llu)",
|
|
(unsigned long long)cno);
|
|
err = -EINVAL;
|
|
}
|
|
goto failed;
|
|
}
|
|
|
|
err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
|
|
&raw_cp->cp_ifile_inode, &root->ifile);
|
|
if (err)
|
|
goto failed_bh;
|
|
|
|
atomic64_set(&root->inodes_count,
|
|
le64_to_cpu(raw_cp->cp_inodes_count));
|
|
atomic64_set(&root->blocks_count,
|
|
le64_to_cpu(raw_cp->cp_blocks_count));
|
|
|
|
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
|
|
|
|
reuse:
|
|
*rootp = root;
|
|
return 0;
|
|
|
|
failed_bh:
|
|
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
|
|
failed:
|
|
nilfs_put_root(root);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_freeze(struct super_block *sb)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
int err;
|
|
|
|
if (sb_rdonly(sb))
|
|
return 0;
|
|
|
|
/* Mark super block clean */
|
|
down_write(&nilfs->ns_sem);
|
|
err = nilfs_cleanup_super(sb);
|
|
up_write(&nilfs->ns_sem);
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_unfreeze(struct super_block *sb)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
|
|
if (sb_rdonly(sb))
|
|
return 0;
|
|
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs_setup_super(sb, false);
|
|
up_write(&nilfs->ns_sem);
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
|
|
struct the_nilfs *nilfs = root->nilfs;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
unsigned long long blocks;
|
|
unsigned long overhead;
|
|
unsigned long nrsvblocks;
|
|
sector_t nfreeblocks;
|
|
u64 nmaxinodes, nfreeinodes;
|
|
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 segment structure,
|
|
* We must count them as the overhead.
|
|
*/
|
|
overhead = 0;
|
|
|
|
err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
err = nilfs_ifile_count_free_inodes(root->ifile,
|
|
&nmaxinodes, &nfreeinodes);
|
|
if (unlikely(err)) {
|
|
nilfs_warn(sb, "failed to count free inodes: err=%d", err);
|
|
if (err == -ERANGE) {
|
|
/*
|
|
* If nilfs_palloc_count_max_entries() returns
|
|
* -ERANGE error code then we simply treat
|
|
* curent inodes count as maximum possible and
|
|
* zero as free inodes value.
|
|
*/
|
|
nmaxinodes = atomic64_read(&root->inodes_count);
|
|
nfreeinodes = 0;
|
|
err = 0;
|
|
} else
|
|
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 = nmaxinodes;
|
|
buf->f_ffree = nfreeinodes;
|
|
buf->f_namelen = NILFS_NAME_LEN;
|
|
buf->f_fsid = u64_to_fsid(id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
|
|
|
|
if (!nilfs_test_opt(nilfs, BARRIER))
|
|
seq_puts(seq, ",nobarrier");
|
|
if (root->cno != NILFS_CPTREE_CURRENT_CNO)
|
|
seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
|
|
if (nilfs_test_opt(nilfs, ERRORS_PANIC))
|
|
seq_puts(seq, ",errors=panic");
|
|
if (nilfs_test_opt(nilfs, ERRORS_CONT))
|
|
seq_puts(seq, ",errors=continue");
|
|
if (nilfs_test_opt(nilfs, STRICT_ORDER))
|
|
seq_puts(seq, ",order=strict");
|
|
if (nilfs_test_opt(nilfs, NORECOVERY))
|
|
seq_puts(seq, ",norecovery");
|
|
if (nilfs_test_opt(nilfs, DISCARD))
|
|
seq_puts(seq, ",discard");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct super_operations nilfs_sops = {
|
|
.alloc_inode = nilfs_alloc_inode,
|
|
.free_inode = nilfs_free_inode,
|
|
.dirty_inode = nilfs_dirty_inode,
|
|
.evict_inode = nilfs_evict_inode,
|
|
.put_super = nilfs_put_super,
|
|
.sync_fs = nilfs_sync_fs,
|
|
.freeze_fs = nilfs_freeze,
|
|
.unfreeze_fs = nilfs_unfreeze,
|
|
.statfs = nilfs_statfs,
|
|
.remount_fs = nilfs_remount,
|
|
.show_options = nilfs_show_options
|
|
};
|
|
|
|
enum {
|
|
Opt_err_cont, Opt_err_panic, Opt_err_ro,
|
|
Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
|
|
Opt_discard, Opt_nodiscard, 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"},
|
|
{Opt_nobarrier, "nobarrier"},
|
|
{Opt_snapshot, "cp=%u"},
|
|
{Opt_order, "order=%s"},
|
|
{Opt_norecovery, "norecovery"},
|
|
{Opt_discard, "discard"},
|
|
{Opt_nodiscard, "nodiscard"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static int parse_options(char *options, struct super_block *sb, int is_remount)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
|
|
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:
|
|
nilfs_set_opt(nilfs, BARRIER);
|
|
break;
|
|
case Opt_nobarrier:
|
|
nilfs_clear_opt(nilfs, BARRIER);
|
|
break;
|
|
case Opt_order:
|
|
if (strcmp(args[0].from, "relaxed") == 0)
|
|
/* Ordered data semantics */
|
|
nilfs_clear_opt(nilfs, STRICT_ORDER);
|
|
else if (strcmp(args[0].from, "strict") == 0)
|
|
/* Strict in-order semantics */
|
|
nilfs_set_opt(nilfs, STRICT_ORDER);
|
|
else
|
|
return 0;
|
|
break;
|
|
case Opt_err_panic:
|
|
nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
|
|
break;
|
|
case Opt_err_ro:
|
|
nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
|
|
break;
|
|
case Opt_err_cont:
|
|
nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
|
|
break;
|
|
case Opt_snapshot:
|
|
if (is_remount) {
|
|
nilfs_err(sb,
|
|
"\"%s\" option is invalid for remount",
|
|
p);
|
|
return 0;
|
|
}
|
|
break;
|
|
case Opt_norecovery:
|
|
nilfs_set_opt(nilfs, NORECOVERY);
|
|
break;
|
|
case Opt_discard:
|
|
nilfs_set_opt(nilfs, DISCARD);
|
|
break;
|
|
case Opt_nodiscard:
|
|
nilfs_clear_opt(nilfs, DISCARD);
|
|
break;
|
|
default:
|
|
nilfs_err(sb, "unrecognized mount option \"%s\"", p);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static inline void
|
|
nilfs_set_default_options(struct super_block *sb,
|
|
struct nilfs_super_block *sbp)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
|
|
nilfs->ns_mount_opt =
|
|
NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
|
|
}
|
|
|
|
static int nilfs_setup_super(struct super_block *sb, int is_mount)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
struct nilfs_super_block **sbp;
|
|
int max_mnt_count;
|
|
int mnt_count;
|
|
|
|
/* nilfs->ns_sem must be locked by the caller. */
|
|
sbp = nilfs_prepare_super(sb, 0);
|
|
if (!sbp)
|
|
return -EIO;
|
|
|
|
if (!is_mount)
|
|
goto skip_mount_setup;
|
|
|
|
max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
|
|
mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
|
|
|
|
if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
|
|
nilfs_warn(sb, "mounting fs with errors");
|
|
#if 0
|
|
} else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
|
|
nilfs_warn(sb, "maximal mount count reached");
|
|
#endif
|
|
}
|
|
if (!max_mnt_count)
|
|
sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
|
|
|
|
sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
|
|
sbp[0]->s_mtime = cpu_to_le64(ktime_get_real_seconds());
|
|
|
|
skip_mount_setup:
|
|
sbp[0]->s_state =
|
|
cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
|
|
/* synchronize sbp[1] with sbp[0] */
|
|
if (sbp[1])
|
|
memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
|
|
return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
|
|
}
|
|
|
|
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 the_nilfs *nilfs = sb->s_fs_info;
|
|
|
|
sb->s_magic = le16_to_cpu(sbp->s_magic);
|
|
|
|
/* FS independent flags */
|
|
#ifdef NILFS_ATIME_DISABLE
|
|
sb->s_flags |= SB_NOATIME;
|
|
#endif
|
|
|
|
nilfs_set_default_options(sb, sbp);
|
|
|
|
nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
|
|
nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
|
|
nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
|
|
nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
|
|
|
|
return !parse_options(data, sb, 0) ? -EINVAL : 0;
|
|
}
|
|
|
|
int nilfs_check_feature_compatibility(struct super_block *sb,
|
|
struct nilfs_super_block *sbp)
|
|
{
|
|
__u64 features;
|
|
|
|
features = le64_to_cpu(sbp->s_feature_incompat) &
|
|
~NILFS_FEATURE_INCOMPAT_SUPP;
|
|
if (features) {
|
|
nilfs_err(sb,
|
|
"couldn't mount because of unsupported optional features (%llx)",
|
|
(unsigned long long)features);
|
|
return -EINVAL;
|
|
}
|
|
features = le64_to_cpu(sbp->s_feature_compat_ro) &
|
|
~NILFS_FEATURE_COMPAT_RO_SUPP;
|
|
if (!sb_rdonly(sb) && features) {
|
|
nilfs_err(sb,
|
|
"couldn't mount RDWR because of unsupported optional features (%llx)",
|
|
(unsigned long long)features);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_get_root_dentry(struct super_block *sb,
|
|
struct nilfs_root *root,
|
|
struct dentry **root_dentry)
|
|
{
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
int ret = 0;
|
|
|
|
inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
nilfs_err(sb, "error %d getting root inode", ret);
|
|
goto out;
|
|
}
|
|
if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
|
|
iput(inode);
|
|
nilfs_err(sb, "corrupt root inode");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
|
|
dentry = d_find_alias(inode);
|
|
if (!dentry) {
|
|
dentry = d_make_root(inode);
|
|
if (!dentry) {
|
|
ret = -ENOMEM;
|
|
goto failed_dentry;
|
|
}
|
|
} else {
|
|
iput(inode);
|
|
}
|
|
} else {
|
|
dentry = d_obtain_root(inode);
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
goto failed_dentry;
|
|
}
|
|
}
|
|
*root_dentry = dentry;
|
|
out:
|
|
return ret;
|
|
|
|
failed_dentry:
|
|
nilfs_err(sb, "error %d getting root dentry", ret);
|
|
goto out;
|
|
}
|
|
|
|
static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
|
|
struct dentry **root_dentry)
|
|
{
|
|
struct the_nilfs *nilfs = s->s_fs_info;
|
|
struct nilfs_root *root;
|
|
int ret;
|
|
|
|
mutex_lock(&nilfs->ns_snapshot_mount_mutex);
|
|
|
|
down_read(&nilfs->ns_segctor_sem);
|
|
ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
|
|
up_read(&nilfs->ns_segctor_sem);
|
|
if (ret < 0) {
|
|
ret = (ret == -ENOENT) ? -EINVAL : ret;
|
|
goto out;
|
|
} else if (!ret) {
|
|
nilfs_err(s,
|
|
"The specified checkpoint is not a snapshot (checkpoint number=%llu)",
|
|
(unsigned long long)cno);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = nilfs_attach_checkpoint(s, cno, false, &root);
|
|
if (ret) {
|
|
nilfs_err(s,
|
|
"error %d while loading snapshot (checkpoint number=%llu)",
|
|
ret, (unsigned long long)cno);
|
|
goto out;
|
|
}
|
|
ret = nilfs_get_root_dentry(s, root, root_dentry);
|
|
nilfs_put_root(root);
|
|
out:
|
|
mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nilfs_tree_is_busy() - try to shrink dentries of a checkpoint
|
|
* @root_dentry: root dentry of the tree to be shrunk
|
|
*
|
|
* This function returns true if the tree was in-use.
|
|
*/
|
|
static bool nilfs_tree_is_busy(struct dentry *root_dentry)
|
|
{
|
|
shrink_dcache_parent(root_dentry);
|
|
return d_count(root_dentry) > 1;
|
|
}
|
|
|
|
int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
struct nilfs_root *root;
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
int ret;
|
|
|
|
if (cno > nilfs->ns_cno)
|
|
return false;
|
|
|
|
if (cno >= nilfs_last_cno(nilfs))
|
|
return true; /* protect recent checkpoints */
|
|
|
|
ret = false;
|
|
root = nilfs_lookup_root(nilfs, cno);
|
|
if (root) {
|
|
inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
|
|
if (inode) {
|
|
dentry = d_find_alias(inode);
|
|
if (dentry) {
|
|
ret = nilfs_tree_is_busy(dentry);
|
|
dput(dentry);
|
|
}
|
|
iput(inode);
|
|
}
|
|
nilfs_put_root(root);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nilfs_fill_super() - initialize a super block instance
|
|
* @sb: super_block
|
|
* @data: mount options
|
|
* @silent: silent mode flag
|
|
*
|
|
* 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_root *fsroot;
|
|
__u64 cno;
|
|
int err;
|
|
|
|
nilfs = alloc_nilfs(sb);
|
|
if (!nilfs)
|
|
return -ENOMEM;
|
|
|
|
sb->s_fs_info = nilfs;
|
|
|
|
err = init_nilfs(nilfs, sb, (char *)data);
|
|
if (err)
|
|
goto failed_nilfs;
|
|
|
|
sb->s_op = &nilfs_sops;
|
|
sb->s_export_op = &nilfs_export_ops;
|
|
sb->s_root = NULL;
|
|
sb->s_time_gran = 1;
|
|
sb->s_max_links = NILFS_LINK_MAX;
|
|
|
|
sb->s_bdi = bdi_get(sb->s_bdev->bd_bdi);
|
|
|
|
err = load_nilfs(nilfs, sb);
|
|
if (err)
|
|
goto failed_nilfs;
|
|
|
|
cno = nilfs_last_cno(nilfs);
|
|
err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
|
|
if (err) {
|
|
nilfs_err(sb,
|
|
"error %d while loading last checkpoint (checkpoint number=%llu)",
|
|
err, (unsigned long long)cno);
|
|
goto failed_unload;
|
|
}
|
|
|
|
if (!sb_rdonly(sb)) {
|
|
err = nilfs_attach_log_writer(sb, fsroot);
|
|
if (err)
|
|
goto failed_checkpoint;
|
|
}
|
|
|
|
err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
|
|
if (err)
|
|
goto failed_segctor;
|
|
|
|
nilfs_put_root(fsroot);
|
|
|
|
if (!sb_rdonly(sb)) {
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs_setup_super(sb, true);
|
|
up_write(&nilfs->ns_sem);
|
|
}
|
|
|
|
return 0;
|
|
|
|
failed_segctor:
|
|
nilfs_detach_log_writer(sb);
|
|
|
|
failed_checkpoint:
|
|
nilfs_put_root(fsroot);
|
|
|
|
failed_unload:
|
|
iput(nilfs->ns_sufile);
|
|
iput(nilfs->ns_cpfile);
|
|
iput(nilfs->ns_dat);
|
|
|
|
failed_nilfs:
|
|
destroy_nilfs(nilfs);
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
unsigned long old_sb_flags;
|
|
unsigned long old_mount_opt;
|
|
int err;
|
|
|
|
sync_filesystem(sb);
|
|
old_sb_flags = sb->s_flags;
|
|
old_mount_opt = nilfs->ns_mount_opt;
|
|
|
|
if (!parse_options(data, sb, 1)) {
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
sb->s_flags = (sb->s_flags & ~SB_POSIXACL);
|
|
|
|
err = -EINVAL;
|
|
|
|
if (!nilfs_valid_fs(nilfs)) {
|
|
nilfs_warn(sb,
|
|
"couldn't remount because the filesystem is in an incomplete recovery state");
|
|
goto restore_opts;
|
|
}
|
|
|
|
if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
|
|
goto out;
|
|
if (*flags & SB_RDONLY) {
|
|
/* Shutting down log writer */
|
|
nilfs_detach_log_writer(sb);
|
|
sb->s_flags |= SB_RDONLY;
|
|
|
|
/*
|
|
* Remounting a valid RW partition RDONLY, so set
|
|
* the RDONLY flag and then mark the partition as valid again.
|
|
*/
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs_cleanup_super(sb);
|
|
up_write(&nilfs->ns_sem);
|
|
} else {
|
|
__u64 features;
|
|
struct nilfs_root *root;
|
|
|
|
/*
|
|
* 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.)
|
|
*/
|
|
down_read(&nilfs->ns_sem);
|
|
features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
|
|
~NILFS_FEATURE_COMPAT_RO_SUPP;
|
|
up_read(&nilfs->ns_sem);
|
|
if (features) {
|
|
nilfs_warn(sb,
|
|
"couldn't remount RDWR because of unsupported optional features (%llx)",
|
|
(unsigned long long)features);
|
|
err = -EROFS;
|
|
goto restore_opts;
|
|
}
|
|
|
|
sb->s_flags &= ~SB_RDONLY;
|
|
|
|
root = NILFS_I(d_inode(sb->s_root))->i_root;
|
|
err = nilfs_attach_log_writer(sb, root);
|
|
if (err)
|
|
goto restore_opts;
|
|
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs_setup_super(sb, true);
|
|
up_write(&nilfs->ns_sem);
|
|
}
|
|
out:
|
|
return 0;
|
|
|
|
restore_opts:
|
|
sb->s_flags = old_sb_flags;
|
|
nilfs->ns_mount_opt = old_mount_opt;
|
|
return err;
|
|
}
|
|
|
|
struct nilfs_super_data {
|
|
struct block_device *bdev;
|
|
__u64 cno;
|
|
int flags;
|
|
};
|
|
|
|
static int nilfs_parse_snapshot_option(const char *option,
|
|
const substring_t *arg,
|
|
struct nilfs_super_data *sd)
|
|
{
|
|
unsigned long long val;
|
|
const char *msg = NULL;
|
|
int err;
|
|
|
|
if (!(sd->flags & SB_RDONLY)) {
|
|
msg = "read-only option is not specified";
|
|
goto parse_error;
|
|
}
|
|
|
|
err = kstrtoull(arg->from, 0, &val);
|
|
if (err) {
|
|
if (err == -ERANGE)
|
|
msg = "too large checkpoint number";
|
|
else
|
|
msg = "malformed argument";
|
|
goto parse_error;
|
|
} else if (val == 0) {
|
|
msg = "invalid checkpoint number 0";
|
|
goto parse_error;
|
|
}
|
|
sd->cno = val;
|
|
return 0;
|
|
|
|
parse_error:
|
|
nilfs_err(NULL, "invalid option \"%s\": %s", option, msg);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* 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 token;
|
|
int ret = 0;
|
|
|
|
do {
|
|
p = strsep(&options, ",");
|
|
if (p != NULL && *p) {
|
|
token = match_token(p, tokens, args);
|
|
if (token == Opt_snapshot)
|
|
ret = nilfs_parse_snapshot_option(p, &args[0],
|
|
sd);
|
|
}
|
|
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)
|
|
{
|
|
s->s_bdev = data;
|
|
s->s_dev = s->s_bdev->bd_dev;
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_test_bdev_super(struct super_block *s, void *data)
|
|
{
|
|
return (void *)s->s_bdev == data;
|
|
}
|
|
|
|
static struct dentry *
|
|
nilfs_mount(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data)
|
|
{
|
|
struct nilfs_super_data sd;
|
|
struct super_block *s;
|
|
fmode_t mode = FMODE_READ | FMODE_EXCL;
|
|
struct dentry *root_dentry;
|
|
int err, s_new = false;
|
|
|
|
if (!(flags & SB_RDONLY))
|
|
mode |= FMODE_WRITE;
|
|
|
|
sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
|
|
if (IS_ERR(sd.bdev))
|
|
return ERR_CAST(sd.bdev);
|
|
|
|
sd.cno = 0;
|
|
sd.flags = flags;
|
|
if (nilfs_identify((char *)data, &sd)) {
|
|
err = -EINVAL;
|
|
goto failed;
|
|
}
|
|
|
|
/*
|
|
* once the super is inserted into the list by sget, s_umount
|
|
* will protect the lockfs code from trying to start a snapshot
|
|
* while we are mounting
|
|
*/
|
|
mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
|
|
if (sd.bdev->bd_fsfreeze_count > 0) {
|
|
mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
|
|
err = -EBUSY;
|
|
goto failed;
|
|
}
|
|
s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags,
|
|
sd.bdev);
|
|
mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
|
|
if (IS_ERR(s)) {
|
|
err = PTR_ERR(s);
|
|
goto failed;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
s_new = true;
|
|
|
|
/* New superblock instance created */
|
|
s->s_mode = mode;
|
|
snprintf(s->s_id, sizeof(s->s_id), "%pg", sd.bdev);
|
|
sb_set_blocksize(s, block_size(sd.bdev));
|
|
|
|
err = nilfs_fill_super(s, data, flags & SB_SILENT ? 1 : 0);
|
|
if (err)
|
|
goto failed_super;
|
|
|
|
s->s_flags |= SB_ACTIVE;
|
|
} else if (!sd.cno) {
|
|
if (nilfs_tree_is_busy(s->s_root)) {
|
|
if ((flags ^ s->s_flags) & SB_RDONLY) {
|
|
nilfs_err(s,
|
|
"the device already has a %s mount.",
|
|
sb_rdonly(s) ? "read-only" : "read/write");
|
|
err = -EBUSY;
|
|
goto failed_super;
|
|
}
|
|
} else {
|
|
/*
|
|
* Try remount to setup mount states if the current
|
|
* tree is not mounted and only snapshots use this sb.
|
|
*/
|
|
err = nilfs_remount(s, &flags, data);
|
|
if (err)
|
|
goto failed_super;
|
|
}
|
|
}
|
|
|
|
if (sd.cno) {
|
|
err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
|
|
if (err)
|
|
goto failed_super;
|
|
} else {
|
|
root_dentry = dget(s->s_root);
|
|
}
|
|
|
|
if (!s_new)
|
|
blkdev_put(sd.bdev, mode);
|
|
|
|
return root_dentry;
|
|
|
|
failed_super:
|
|
deactivate_locked_super(s);
|
|
|
|
failed:
|
|
if (!s_new)
|
|
blkdev_put(sd.bdev, mode);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
struct file_system_type nilfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "nilfs2",
|
|
.mount = nilfs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("nilfs2");
|
|
|
|
static void nilfs_inode_init_once(void *obj)
|
|
{
|
|
struct nilfs_inode_info *ii = obj;
|
|
|
|
INIT_LIST_HEAD(&ii->i_dirty);
|
|
#ifdef CONFIG_NILFS_XATTR
|
|
init_rwsem(&ii->xattr_sem);
|
|
#endif
|
|
address_space_init_once(&ii->i_btnode_cache);
|
|
ii->i_bmap = &ii->i_bmap_data;
|
|
inode_init_once(&ii->vfs_inode);
|
|
}
|
|
|
|
static void nilfs_segbuf_init_once(void *obj)
|
|
{
|
|
memset(obj, 0, sizeof(struct nilfs_segment_buffer));
|
|
}
|
|
|
|
static void nilfs_destroy_cachep(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
|
|
kmem_cache_destroy(nilfs_inode_cachep);
|
|
kmem_cache_destroy(nilfs_transaction_cachep);
|
|
kmem_cache_destroy(nilfs_segbuf_cachep);
|
|
kmem_cache_destroy(nilfs_btree_path_cache);
|
|
}
|
|
|
|
static int __init nilfs_init_cachep(void)
|
|
{
|
|
nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
|
|
sizeof(struct nilfs_inode_info), 0,
|
|
SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
|
|
nilfs_inode_init_once);
|
|
if (!nilfs_inode_cachep)
|
|
goto fail;
|
|
|
|
nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
|
|
sizeof(struct nilfs_transaction_info), 0,
|
|
SLAB_RECLAIM_ACCOUNT, NULL);
|
|
if (!nilfs_transaction_cachep)
|
|
goto fail;
|
|
|
|
nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
|
|
sizeof(struct nilfs_segment_buffer), 0,
|
|
SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
|
|
if (!nilfs_segbuf_cachep)
|
|
goto fail;
|
|
|
|
nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
|
|
sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
|
|
0, 0, NULL);
|
|
if (!nilfs_btree_path_cache)
|
|
goto fail;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
nilfs_destroy_cachep();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int __init init_nilfs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
err = nilfs_init_cachep();
|
|
if (err)
|
|
goto fail;
|
|
|
|
err = nilfs_sysfs_init();
|
|
if (err)
|
|
goto free_cachep;
|
|
|
|
err = register_filesystem(&nilfs_fs_type);
|
|
if (err)
|
|
goto deinit_sysfs_entry;
|
|
|
|
printk(KERN_INFO "NILFS version 2 loaded\n");
|
|
return 0;
|
|
|
|
deinit_sysfs_entry:
|
|
nilfs_sysfs_exit();
|
|
free_cachep:
|
|
nilfs_destroy_cachep();
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_nilfs_fs(void)
|
|
{
|
|
nilfs_destroy_cachep();
|
|
nilfs_sysfs_exit();
|
|
unregister_filesystem(&nilfs_fs_type);
|
|
}
|
|
|
|
module_init(init_nilfs_fs)
|
|
module_exit(exit_nilfs_fs)
|