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      1 /*
      2  * quota.c --- code for handling ext4 quota inodes
      3  *
      4  */
      5 
      6 #include "config.h"
      7 #ifdef HAVE_SYS_MOUNT_H
      8 #include <sys/param.h>
      9 #include <sys/mount.h>
     10 #define MNT_FL (MS_MGC_VAL | MS_RDONLY)
     11 #endif
     12 #ifdef HAVE_SYS_STAT_H
     13 #include <sys/stat.h>
     14 #endif
     15 
     16 #include "e2fsck.h"
     17 #include "problem.h"
     18 
     19 static void move_quota_inode(ext2_filsys fs, ext2_ino_t from_ino,
     20 			     ext2_ino_t to_ino, enum quota_type qtype)
     21 {
     22 	struct ext2_inode	inode;
     23 	errcode_t		retval;
     24 	char			qf_name[QUOTA_NAME_LEN];
     25 
     26 	/* We need the inode bitmap to be loaded */
     27 	if (ext2fs_read_bitmaps(fs))
     28 		return;
     29 
     30 	retval = ext2fs_read_inode(fs, from_ino, &inode);
     31 	if (retval) {
     32 		com_err("ext2fs_read_inode", retval, "%s",
     33 			_("in move_quota_inode"));
     34 		return;
     35 	}
     36 
     37 	inode.i_links_count = 1;
     38 	inode.i_mode = LINUX_S_IFREG | 0600;
     39 	inode.i_flags = EXT2_IMMUTABLE_FL;
     40 	if (ext2fs_has_feature_extents(fs->super))
     41 		inode.i_flags |= EXT4_EXTENTS_FL;
     42 
     43 	retval = ext2fs_write_new_inode(fs, to_ino, &inode);
     44 	if (retval) {
     45 		com_err("ext2fs_write_new_inode", retval, "%s",
     46 			_("in move_quota_inode"));
     47 		return;
     48 	}
     49 
     50 	/* unlink the old inode */
     51 	quota_get_qf_name(qtype, QFMT_VFS_V1, qf_name);
     52 	ext2fs_unlink(fs, EXT2_ROOT_INO, qf_name, from_ino, 0);
     53 	ext2fs_inode_alloc_stats(fs, from_ino, -1);
     54 	/* Clear out the original inode in the inode-table block. */
     55 	memset(&inode, 0, sizeof(struct ext2_inode));
     56 	ext2fs_write_inode(fs, from_ino, &inode);
     57 }
     58 
     59 void e2fsck_hide_quota(e2fsck_t ctx)
     60 {
     61 	struct ext2_super_block *sb = ctx->fs->super;
     62 	struct problem_context	pctx;
     63 	ext2_filsys		fs = ctx->fs;
     64 	enum quota_type qtype;
     65 	ext2_ino_t quota_ino;
     66 
     67 	clear_problem_context(&pctx);
     68 
     69 	if ((ctx->options & E2F_OPT_READONLY) ||
     70 	    !ext2fs_has_feature_quota(sb))
     71 		return;
     72 
     73 	for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
     74 		pctx.ino = *quota_sb_inump(sb, qtype);
     75 		quota_ino = quota_type2inum(qtype, fs->super);
     76 		if (pctx.ino && (pctx.ino != quota_ino) &&
     77 		    fix_problem(ctx, PR_0_HIDE_QUOTA, &pctx)) {
     78 			move_quota_inode(fs, pctx.ino, quota_ino, qtype);
     79 			*quota_sb_inump(sb, qtype) = quota_ino;
     80 		}
     81 	}
     82 
     83 	return;
     84 }
     85