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1473 lines
35 KiB
1473 lines
35 KiB
// 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 ([email protected]) |
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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 ([email protected]), 1995 |
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*/ |
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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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|
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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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|
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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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|
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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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|
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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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|
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va_start(args, fmt); |
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|
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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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|
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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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|
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va_end(args); |
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} |
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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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|
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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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/** |
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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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|
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va_start(args, fmt); |
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|
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vaf.fmt = fmt; |
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vaf.va = &args; |
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|
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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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|
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va_end(args); |
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|
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if (!sb_rdonly(sb)) { |
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nilfs_set_error(sb); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
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} |
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (flip && sbp[1]) |
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nilfs_swap_super_block(nilfs); |
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|
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return sbp; |
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} |
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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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|
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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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/** |
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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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|
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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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ret = nilfs_commit_super(sb, flag); |
|
} |
|
return ret; |
|
} |
|
|
|
/** |
|
* nilfs_move_2nd_super - relocate secondary super block |
|
* @sb: super block instance |
|
* @sb2off: new offset of the secondary super block (in bytes) |
|
*/ |
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static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) |
|
{ |
|
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; |
|
unsigned long offset; |
|
int sb2i; /* array index of the secondary superblock */ |
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int ret = 0; |
|
|
|
/* nilfs->ns_sem must be locked by the caller. */ |
|
if (nilfs->ns_sbh[1] && |
|
nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { |
|
sb2i = 1; |
|
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; |
|
} else { |
|
sb2i = -1; |
|
blocknr = 0; |
|
} |
|
if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) |
|
goto out; /* super block location is unchanged */ |
|
|
|
/* Get new super block buffer */ |
|
newblocknr = sb2off >> nilfs->ns_blocksize_bits; |
|
offset = sb2off & (nilfs->ns_blocksize - 1); |
|
nsbh = sb_getblk(sb, newblocknr); |
|
if (!nsbh) { |
|
nilfs_warn(sb, |
|
"unable to move secondary superblock to block %llu", |
|
(unsigned long long)newblocknr); |
|
ret = -EIO; |
|
goto out; |
|
} |
|
nsbp = (void *)nsbh->b_data + offset; |
|
memset(nsbp, 0, nilfs->ns_blocksize); |
|
|
|
if (sb2i >= 0) { |
|
memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); |
|
brelse(nilfs->ns_sbh[sb2i]); |
|
nilfs->ns_sbh[sb2i] = nsbh; |
|
nilfs->ns_sbp[sb2i] = nsbp; |
|
} else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { |
|
/* secondary super block will be restored to index 1 */ |
|
nilfs->ns_sbh[1] = nsbh; |
|
nilfs->ns_sbp[1] = nsbp; |
|
} else { |
|
brelse(nsbh); |
|
} |
|
out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* nilfs_resize_fs - resize the filesystem |
|
* @sb: super block instance |
|
* @newsize: new size of the filesystem (in bytes) |
|
*/ |
|
int nilfs_resize_fs(struct super_block *sb, __u64 newsize) |
|
{ |
|
struct the_nilfs *nilfs = sb->s_fs_info; |
|
struct nilfs_super_block **sbp; |
|
__u64 devsize, newnsegs; |
|
loff_t sb2off; |
|
int ret; |
|
|
|
ret = -ERANGE; |
|
devsize = i_size_read(sb->s_bdev->bd_inode); |
|
if (newsize > devsize) |
|
goto out; |
|
|
|
/* |
|
* Write lock is required to protect some functions depending |
|
* on the number of segments, the number of reserved segments, |
|
* and so forth. |
|
*/ |
|
down_write(&nilfs->ns_segctor_sem); |
|
|
|
sb2off = NILFS_SB2_OFFSET_BYTES(newsize); |
|
newnsegs = sb2off >> nilfs->ns_blocksize_bits; |
|
do_div(newnsegs, nilfs->ns_blocks_per_segment); |
|
|
|
ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); |
|
up_write(&nilfs->ns_segctor_sem); |
|
if (ret < 0) |
|
goto out; |
|
|
|
ret = nilfs_construct_segment(sb); |
|
if (ret < 0) |
|
goto out; |
|
|
|
down_write(&nilfs->ns_sem); |
|
nilfs_move_2nd_super(sb, sb2off); |
|
ret = -EIO; |
|
sbp = nilfs_prepare_super(sb, 0); |
|
if (likely(sbp)) { |
|
nilfs_set_log_cursor(sbp[0], nilfs); |
|
/* |
|
* Drop NILFS_RESIZE_FS flag for compatibility with |
|
* mount-time resize which may be implemented in a |
|
* future release. |
|
*/ |
|
sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & |
|
~NILFS_RESIZE_FS); |
|
sbp[0]->s_dev_size = cpu_to_le64(newsize); |
|
sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); |
|
if (sbp[1]) |
|
memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
|
ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
|
} |
|
up_write(&nilfs->ns_sem); |
|
|
|
/* |
|
* Reset the range of allocatable segments last. This order |
|
* is important in the case of expansion because the secondary |
|
* superblock must be protected from log write until migration |
|
* completes. |
|
*/ |
|
if (!ret) |
|
nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); |
|
out: |
|
return ret; |
|
} |
|
|
|
static void nilfs_put_super(struct super_block *sb) |
|
{ |
|
struct the_nilfs *nilfs = sb->s_fs_info; |
|
|
|
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)
|
|
|