super.c

linux 内核源代码

	ei->vfs_inode.i_version = 1;
	return &ei->vfs_inode;
}

static void ext3_destroy_inode(struct inode *inode)
{
	if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
		printk("EXT3 Inode %p: orphan list check failed!\n",
			EXT3_I(inode));
		print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
				EXT3_I(inode), sizeof(struct ext3_inode_info),
				false);
		dump_stack();
	}
	kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
}

static void init_once(struct kmem_cache * cachep, void *foo)
{
	struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;

	INIT_LIST_HEAD(&ei->i_orphan);
#ifdef CONFIG_EXT3_FS_XATTR
	init_rwsem(&ei->xattr_sem);
#endif
	mutex_init(&ei->truncate_mutex);
	inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
	ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
					     sizeof(struct ext3_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					     init_once);
	if (ext3_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	kmem_cache_destroy(ext3_inode_cachep);
}

static void ext3_clear_inode(struct inode *inode)
{
	struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
#ifdef CONFIG_EXT3_FS_POSIX_ACL
	if (EXT3_I(inode)->i_acl &&
			EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
		posix_acl_release(EXT3_I(inode)->i_acl);
		EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
	}
	if (EXT3_I(inode)->i_default_acl &&
			EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
		posix_acl_release(EXT3_I(inode)->i_default_acl);
		EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
	}
#endif
	ext3_discard_reservation(inode);
	EXT3_I(inode)->i_block_alloc_info = NULL;
	if (unlikely(rsv))
		kfree(rsv);
}

static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
{
#if defined(CONFIG_QUOTA)
	struct ext3_sb_info *sbi = EXT3_SB(sb);

	if (sbi->s_jquota_fmt)
		seq_printf(seq, ",jqfmt=%s",
		(sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");

	if (sbi->s_qf_names[USRQUOTA])
		seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);

	if (sbi->s_qf_names[GRPQUOTA])
		seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);

	if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
		seq_puts(seq, ",usrquota");

	if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
		seq_puts(seq, ",grpquota");
#endif
}

/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
	struct super_block *sb = vfs->mnt_sb;
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	struct ext3_super_block *es = sbi->s_es;
	unsigned long def_mount_opts;

	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);

	if (sbi->s_sb_block != 1)
		seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
	if (test_opt(sb, MINIX_DF))
		seq_puts(seq, ",minixdf");
	if (test_opt(sb, GRPID))
		seq_puts(seq, ",grpid");
	if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
		seq_puts(seq, ",nogrpid");
	if (sbi->s_resuid != EXT3_DEF_RESUID ||
	    le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
		seq_printf(seq, ",resuid=%u", sbi->s_resuid);
	}
	if (sbi->s_resgid != EXT3_DEF_RESGID ||
	    le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
		seq_printf(seq, ",resgid=%u", sbi->s_resgid);
	}
	if (test_opt(sb, ERRORS_CONT)) {
		int def_errors = le16_to_cpu(es->s_errors);

		if (def_errors == EXT3_ERRORS_PANIC ||
		    def_errors == EXT3_ERRORS_RO) {
			seq_puts(seq, ",errors=continue");
		}
	}
	if (test_opt(sb, ERRORS_RO))
		seq_puts(seq, ",errors=remount-ro");
	if (test_opt(sb, ERRORS_PANIC))
		seq_puts(seq, ",errors=panic");
	if (test_opt(sb, NO_UID32))
		seq_puts(seq, ",nouid32");
	if (test_opt(sb, DEBUG))
		seq_puts(seq, ",debug");
	if (test_opt(sb, OLDALLOC))
		seq_puts(seq, ",oldalloc");
#ifdef CONFIG_EXT3_FS_XATTR
	if (test_opt(sb, XATTR_USER))
		seq_puts(seq, ",user_xattr");
	if (!test_opt(sb, XATTR_USER) &&
	    (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
		seq_puts(seq, ",nouser_xattr");
	}
#endif
#ifdef CONFIG_EXT3_FS_POSIX_ACL
	if (test_opt(sb, POSIX_ACL))
		seq_puts(seq, ",acl");
	if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
		seq_puts(seq, ",noacl");
#endif
	if (!test_opt(sb, RESERVATION))
		seq_puts(seq, ",noreservation");
	if (sbi->s_commit_interval) {
		seq_printf(seq, ",commit=%u",
			   (unsigned) (sbi->s_commit_interval / HZ));
	}
	if (test_opt(sb, BARRIER))
		seq_puts(seq, ",barrier=1");
	if (test_opt(sb, NOBH))
		seq_puts(seq, ",nobh");

	if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
		seq_puts(seq, ",data=journal");
	else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
		seq_puts(seq, ",data=ordered");
	else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
		seq_puts(seq, ",data=writeback");

	ext3_show_quota_options(seq, sb);

	return 0;
}


static struct inode *ext3_nfs_get_inode(struct super_block *sb,
		u64 ino, u32 generation)
{
	struct inode *inode;

	if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
		return ERR_PTR(-ESTALE);
	if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
	 * ext3_read_inode will return a bad_inode if the inode had been
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
	inode = iget(sb, ino);
	if (inode == NULL)
		return ERR_PTR(-ENOMEM);
	if (is_bad_inode(inode) ||
	    (generation && inode->i_generation != generation)) {
		iput(inode);
		return ERR_PTR(-ESTALE);
	}

	return inode;
}

static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    ext3_nfs_get_inode);
}

static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext3_nfs_get_inode);
}

#ifdef CONFIG_QUOTA
#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))

static int ext3_dquot_initialize(struct inode *inode, int type);
static int ext3_dquot_drop(struct inode *inode);
static int ext3_write_dquot(struct dquot *dquot);
static int ext3_acquire_dquot(struct dquot *dquot);
static int ext3_release_dquot(struct dquot *dquot);
static int ext3_mark_dquot_dirty(struct dquot *dquot);
static int ext3_write_info(struct super_block *sb, int type);
static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
static int ext3_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
			       size_t len, loff_t off);
static ssize_t ext3_quota_write(struct super_block *sb, int type,
				const char *data, size_t len, loff_t off);

static struct dquot_operations ext3_quota_operations = {
	.initialize	= ext3_dquot_initialize,
	.drop		= ext3_dquot_drop,
	.alloc_space	= dquot_alloc_space,
	.alloc_inode	= dquot_alloc_inode,
	.free_space	= dquot_free_space,
	.free_inode	= dquot_free_inode,
	.transfer	= dquot_transfer,
	.write_dquot	= ext3_write_dquot,
	.acquire_dquot	= ext3_acquire_dquot,
	.release_dquot	= ext3_release_dquot,
	.mark_dirty	= ext3_mark_dquot_dirty,
	.write_info	= ext3_write_info
};

static struct quotactl_ops ext3_qctl_operations = {
	.quota_on	= ext3_quota_on,
	.quota_off	= vfs_quota_off,
	.quota_sync	= vfs_quota_sync,
	.get_info	= vfs_get_dqinfo,
	.set_info	= vfs_set_dqinfo,
	.get_dqblk	= vfs_get_dqblk,
	.set_dqblk	= vfs_set_dqblk
};
#endif

static const struct super_operations ext3_sops = {
	.alloc_inode	= ext3_alloc_inode,
	.destroy_inode	= ext3_destroy_inode,
	.read_inode	= ext3_read_inode,
	.write_inode	= ext3_write_inode,
	.dirty_inode	= ext3_dirty_inode,
	.delete_inode	= ext3_delete_inode,
	.put_super	= ext3_put_super,
	.write_super	= ext3_write_super,
	.sync_fs	= ext3_sync_fs,
	.write_super_lockfs = ext3_write_super_lockfs,
	.unlockfs	= ext3_unlockfs,
	.statfs		= ext3_statfs,
	.remount_fs	= ext3_remount,
	.clear_inode	= ext3_clear_inode,
	.show_options	= ext3_show_options,
#ifdef CONFIG_QUOTA
	.quota_read	= ext3_quota_read,
	.quota_write	= ext3_quota_write,
#endif
};

static const struct export_operations ext3_export_ops = {
	.fh_to_dentry = ext3_fh_to_dentry,
	.fh_to_parent = ext3_fh_to_parent,
	.get_parent = ext3_get_parent,
};

enum {
	Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
	Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
	Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
	Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
	Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
	Opt_grpquota
};

static match_table_t tokens = {
	{Opt_bsd_df, "bsddf"},
	{Opt_minix_df, "minixdf"},
	{Opt_grpid, "grpid"},
	{Opt_grpid, "bsdgroups"},
	{Opt_nogrpid, "nogrpid"},
	{Opt_nogrpid, "sysvgroups"},
	{Opt_resgid, "resgid=%u"},
	{Opt_resuid, "resuid=%u"},
	{Opt_sb, "sb=%u"},
	{Opt_err_cont, "errors=continue"},
	{Opt_err_panic, "errors=panic"},
	{Opt_err_ro, "errors=remount-ro"},
	{Opt_nouid32, "nouid32"},
	{Opt_nocheck, "nocheck"},
	{Opt_nocheck, "check=none"},
	{Opt_debug, "debug"},
	{Opt_oldalloc, "oldalloc"},
	{Opt_orlov, "orlov"},
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
	{Opt_reservation, "reservation"},
	{Opt_noreservation, "noreservation"},
	{Opt_noload, "noload"},
	{Opt_nobh, "nobh"},
	{Opt_bh, "bh"},
	{Opt_commit, "commit=%u"},
	{Opt_journal_update, "journal=update"},
	{Opt_journal_inum, "journal=%u"},
	{Opt_journal_dev, "journal_dev=%u"},
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
	{Opt_offusrjquota, "usrjquota="},
	{Opt_usrjquota, "usrjquota=%s"},
	{Opt_offgrpjquota, "grpjquota="},
	{Opt_grpjquota, "grpjquota=%s"},
	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
	{Opt_err, NULL},
	{Opt_resize, "resize"},
};

static ext3_fsblk_t get_sb_block(void **data)
{
	ext3_fsblk_t	sb_block;
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
	options += 3;
	/*todo: use simple_strtoll with >32bit ext3 */
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
		printk("EXT3-fs: Invalid sb specification: %s\n",
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
	return sb_block;
}

static int parse_options (char *options, struct super_block *sb,
			  unsigned int *inum, unsigned long *journal_devnum,
			  ext3_fsblk_t *n_blocks_count, int is_remount)
{
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	char * p;
	substring_t args[MAX_OPT_ARGS];
	int data_opt = 0;
	int option;
#ifdef CONFIG_QUOTA
	int qtype;
	char *qname;
#endif

	if (!options)
		return 1;

	while ((p = strsep (&options, ",")) != NULL) {
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_bsd_df:
			clear_opt (sbi->s_mount_opt, MINIX_DF);
			break;
		case Opt_minix_df:
			set_opt (sbi->s_mount_opt, MINIX_DF);
			break;
		case Opt_grpid:
			set_opt (sbi->s_mount_opt, GRPID);
			break;
		case Opt_nogrpid:
			clear_opt (sbi->s_mount_opt, GRPID);
			break;
		case Opt_resuid:
			if (match_int(&args[0], &option))
				return 0;
			sbi->s_resuid = option;
			break;
		case Opt_resgid:
			if (match_int(&args[0], &option))
				return 0;
			sbi->s_resgid = option;
			break;
		case Opt_sb:
			/* handled by get_sb_block() instead of here */
			/* *sb_block = match_int(&args[0]); */
			break;
		case Opt_err_panic:
			clear_opt (sbi->s_mount_opt, ERRORS_CONT);
			clear_opt (sbi->s_mount_opt, ERRORS_RO);
			set_opt (sbi->s_mount_opt, ERRORS_PANIC);
			break;
		case Opt_err_ro:
			clear_opt (sbi->s_mount_opt, ERRORS_CONT);
			clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
			set_opt (sbi->s_mount_opt, ERRORS_RO);
			break;
		case Opt_err_cont:
			clear_opt (sbi->s_mount_opt, ERRORS_RO);
			clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
			set_opt (sbi->s_mount_opt, ERRORS_CONT);
			break;
		case Opt_nouid32:
			set_opt (sbi->s_mount_opt, NO_UID32);
			break;
		case Opt_nocheck:
			clear_opt (sbi->s_mount_opt, CHECK);
			break;
		case Opt_debug:
			set_opt (sbi->s_mount_opt, DEBUG);
			break;
		case Opt_oldalloc:
			set_opt (sbi->s_mount_opt, OLDALLOC);
			break;
		case Opt_orlov:
			clear_opt (sbi->s_mount_opt, OLDALLOC);