C++ (Cpp) sysaufs_si_init示例

示例#1

文件： sbinfo.c 项目： chrmorais/miniemc2

int au_si_alloc(struct super_block *sb)
{
	int err;
	struct au_sbinfo *sbinfo;

	err = -ENOMEM;
	sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS);
	if (unlikely(!sbinfo))
		goto out;

	/* will be reallocated separately */
	sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
	if (unlikely(!sbinfo->si_branch))
		goto out_sbinfo;

	err = sysaufs_si_init(sbinfo);
	if (unlikely(err))
		goto out_br;

	au_nwt_init(&sbinfo->si_nowait);
	au_rw_init_wlock(&sbinfo->si_rwsem);
	sbinfo->si_bend = -1;

	sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
	sbinfo->si_wbr_create = AuWbrCreate_Def;
	sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup;
	sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create;

	sbinfo->si_mntflags = AuOpt_Def;

	mutex_init(&sbinfo->si_xib_mtx);
	sbinfo->si_xino_brid = -1;
	/* leave si_xib_last_pindex and si_xib_next_bit */

	sbinfo->si_rdcache = AUFS_RDCACHE_DEF * HZ;
	sbinfo->si_rdblk = AUFS_RDBLK_DEF;
	sbinfo->si_rdhash = AUFS_RDHASH_DEF;
	sbinfo->si_dirwh = AUFS_DIRWH_DEF;

	au_spl_init(&sbinfo->si_plink);
	init_waitqueue_head(&sbinfo->si_plink_wq);
	spin_lock_init(&sbinfo->si_plink_maint_lock);

	/* leave other members for sysaufs and si_mnt. */
	sbinfo->si_sb = sb;
	sb->s_fs_info = sbinfo;
	au_debug_sbinfo_init(sbinfo);
	return 0; /* success */

 out_br:
	kfree(sbinfo->si_branch);
 out_sbinfo:
	kfree(sbinfo);
 out:
	return err;
}

示例#2

int au_si_alloc(struct super_block *sb)
{
	int err;
	struct au_sbinfo *sbinfo;
	static struct lock_class_key aufs_si;

	err = -ENOMEM;
	sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS);
	if (unlikely(!sbinfo))
		goto out;

	BUILD_BUG_ON(sizeof(unsigned long) !=
		     sizeof(*sbinfo->au_si_pid.bitmap));
	sbinfo->au_si_pid.bitmap = kcalloc(BITS_TO_LONGS(PID_MAX_DEFAULT),
					sizeof(*sbinfo->au_si_pid.bitmap),
					GFP_NOFS);
	if (unlikely(!sbinfo->au_si_pid.bitmap))
		goto out_sbinfo;

	/* will be reallocated separately */
	sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
	if (unlikely(!sbinfo->si_branch))
		goto out_pidmap;

	err = sysaufs_si_init(sbinfo);
	if (unlikely(err))
		goto out_br;

	au_nwt_init(&sbinfo->si_nowait);
	au_rw_init_wlock(&sbinfo->si_rwsem);
	au_rw_class(&sbinfo->si_rwsem, &aufs_si);
	spin_lock_init(&sbinfo->au_si_pid.tree_lock);
	INIT_RADIX_TREE(&sbinfo->au_si_pid.tree, GFP_ATOMIC | __GFP_NOFAIL);

	atomic_long_set(&sbinfo->si_ninodes, 0);
	atomic_long_set(&sbinfo->si_nfiles, 0);

	sbinfo->si_bend = -1;

	sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
	sbinfo->si_wbr_create = AuWbrCreate_Def;
	sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup;
	sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create;

	sbinfo->si_mntflags = au_opts_plink(AuOpt_Def);

	mutex_init(&sbinfo->si_xib_mtx);
	sbinfo->si_xino_brid = -1;
	/* leave si_xib_last_pindex and si_xib_next_bit */

	sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC);
	sbinfo->si_rdblk = AUFS_RDBLK_DEF;
	sbinfo->si_rdhash = AUFS_RDHASH_DEF;
	sbinfo->si_dirwh = AUFS_DIRWH_DEF;

	au_spl_init(&sbinfo->si_plink);
	init_waitqueue_head(&sbinfo->si_plink_wq);
	spin_lock_init(&sbinfo->si_plink_maint_lock);

	/* leave other members for sysaufs and si_mnt. */
	sbinfo->si_sb = sb;
	sb->s_fs_info = sbinfo;
	si_pid_set(sb);
	au_debug_sbinfo_init(sbinfo);
	return 0; /* success */

out_br:
	kfree(sbinfo->si_branch);
out_pidmap:
	kfree(sbinfo->au_si_pid.bitmap);
out_sbinfo:
	kfree(sbinfo);
out:
	return err;
}