e2fsprogs/e2fsck/quota.c

/*
 * quota.c --- code for handling ext4 quota inodes
 *
 */

#ifdef HAVE_SYS_MOUNT_H
#include <sys/param.h>
#include <sys/mount.h>
#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#include "e2fsck.h"
#include "problem.h"
#include "quota/mkquota.h"
#include "quota/quotaio.h"

static void move_quota_inode(ext2_filsys fs, ext2_ino_t from_ino,
			     ext2_ino_t to_ino, int qtype)
{
	struct ext2_inode	inode;
	char			qf_name[QUOTA_NAME_LEN];

	/* We need the inode bitmap to be loaded */
	if (ext2fs_read_bitmaps(fs))
		return;

	if (ext2fs_read_inode(fs, from_ino, &inode))
		return;

	inode.i_links_count = 1;
	inode.i_mode = LINUX_S_IFREG | 0600;
	inode.i_flags = EXT2_IMMUTABLE_FL;
	if (fs->super->s_feature_incompat &
			EXT3_FEATURE_INCOMPAT_EXTENTS)
		inode.i_flags |= EXT4_EXTENTS_FL;

	ext2fs_write_new_inode(fs, to_ino, &inode);
	/* unlink the old inode */
	quota_get_qf_name(qtype, QFMT_VFS_V1, qf_name);
	ext2fs_unlink(fs, EXT2_ROOT_INO, qf_name, from_ino, 0);
	ext2fs_inode_alloc_stats(fs, from_ino, -1);
	/* Clear out the original inode in the inode-table block. */
	memset(&inode, 0, sizeof(struct ext2_inode));
	ext2fs_write_inode(fs, from_ino, &inode);
}

void e2fsck_hide_quota(e2fsck_t ctx)
{
	struct ext2_super_block *sb = ctx->fs->super;
	struct problem_context	pctx;
	ext2_filsys		fs = ctx->fs;

	clear_problem_context(&pctx);

	if ((ctx->options & E2F_OPT_READONLY) ||
	    !(sb->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_QUOTA))
		return;

	pctx.ino = sb->s_usr_quota_inum;
	if (sb->s_usr_quota_inum &&
	    (sb->s_usr_quota_inum != EXT4_USR_QUOTA_INO) &&
	    fix_problem(ctx, PR_0_HIDE_QUOTA, &pctx)) {
		move_quota_inode(fs, sb->s_usr_quota_inum, EXT4_USR_QUOTA_INO,
				 USRQUOTA);
		sb->s_usr_quota_inum = EXT4_USR_QUOTA_INO;
	}

	pctx.ino = sb->s_grp_quota_inum;
	if (sb->s_grp_quota_inum &&
	    (sb->s_grp_quota_inum != EXT4_GRP_QUOTA_INO) &&
	    fix_problem(ctx, PR_0_HIDE_QUOTA, &pctx)) {
		move_quota_inode(fs, sb->s_grp_quota_inum, EXT4_GRP_QUOTA_INO,
				 GRPQUOTA);
		sb->s_grp_quota_inum = EXT4_GRP_QUOTA_INO;
	}

	return;
}