fs/ocfs2/super.c

Source file repositories/reference/linux-study-clean/fs/ocfs2/super.c

File Facts

System
Linux kernel
Corpus path
fs/ocfs2/super.c
Extension
.c
Size
69583 bytes
Lines
2575
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct file_operations ocfs2_osb_debug_fops = {
	.open =		ocfs2_osb_debug_open,
	.release =	ocfs2_debug_release,
	.read =		ocfs2_debug_read,
	.llseek =	generic_file_llseek,
};

static int ocfs2_sync_fs(struct super_block *sb, int wait)
{
	int status;
	tid_t target;
	struct ocfs2_super *osb = OCFS2_SB(sb);

	if (ocfs2_is_hard_readonly(osb))
		return -EROFS;

	if (wait) {
		status = ocfs2_flush_truncate_log(osb);
		if (status < 0)
			mlog_errno(status);
	} else {
		ocfs2_schedule_truncate_log_flush(osb, 0);
	}

	if (jbd2_journal_start_commit(osb->journal->j_journal,
				      &target)) {
		if (wait)
			jbd2_log_wait_commit(osb->journal->j_journal,
					     target);
	}
	return 0;
}

static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
{
	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
	    && (ino == USER_QUOTA_SYSTEM_INODE
		|| ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
		return 0;
	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
	    && (ino == GROUP_QUOTA_SYSTEM_INODE
		|| ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
		return 0;
	return 1;
}

static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
{
	struct inode *new = NULL;
	int status = 0;
	int i;

	new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
	if (IS_ERR(new)) {
		status = PTR_ERR(new);
		mlog_errno(status);
		goto bail;
	}
	osb->root_inode = new;

	new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
	if (IS_ERR(new)) {
		status = PTR_ERR(new);
		mlog_errno(status);
		goto bail;
	}
	osb->sys_root_inode = new;

	for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
	     i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
		if (!ocfs2_need_system_inode(osb, i))
			continue;
		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
		if (!new) {
			ocfs2_release_system_inodes(osb);
			status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
			mlog_errno(status);
			mlog(ML_ERROR, "Unable to load system inode %d, "
			     "possibly corrupt fs?", i);
			goto bail;
		}
		// the array now has one ref, so drop this one
		iput(new);
	}

bail:
	if (status)
		mlog_errno(status);
	return status;
}

Annotation

Implementation Notes