quota.c revision e0ed7404719a9ddd2ba427a80db5365c8bad18c0 
1/*
2 * quota.c --- code for handling ext4 quota inodes
3 *
4 */
5
6#ifdef HAVE_SYS_MOUNT_H
7#include <sys/param.h>
8#include <sys/mount.h>
9#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
10#endif
11#ifdef HAVE_SYS_STAT_H
12#include <sys/stat.h>
13#endif
14
15#include "e2fsck.h"
16#include "problem.h"
17#include "quota/mkquota.h"
18#include "quota/quotaio.h"
19
20static void move_quota_inode(ext2_filsys fs, ext2_ino_t from_ino,
21			     ext2_ino_t to_ino, int qtype)
22{
23	struct ext2_inode	inode;
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	if (ext2fs_read_inode(fs, from_ino, &inode))
31		return;
32
33	inode.i_links_count = 1;
34	inode.i_mode = LINUX_S_IFREG | 0600;
35	inode.i_flags = EXT2_IMMUTABLE_FL;
36	if (fs->super->s_feature_incompat &
37			EXT3_FEATURE_INCOMPAT_EXTENTS)
38		inode.i_flags |= EXT4_EXTENTS_FL;
39
40	ext2fs_write_new_inode(fs, to_ino, &inode);
41	/* unlink the old inode */
42	quota_get_qf_name(qtype, QFMT_VFS_V1, qf_name);
43	ext2fs_unlink(fs, EXT2_ROOT_INO, qf_name, from_ino, 0);
44	ext2fs_inode_alloc_stats(fs, from_ino, -1);
45	/* Clear out the original inode in the inode-table block. */
46	memset(&inode, 0, sizeof(struct ext2_inode));
47	ext2fs_write_inode(fs, from_ino, &inode);
48}
49
50void e2fsck_hide_quota(e2fsck_t ctx)
51{
52	struct ext2_super_block *sb = ctx->fs->super;
53	struct problem_context	pctx;
54	ext2_filsys		fs = ctx->fs;
55
56	clear_problem_context(&pctx);
57
58	if ((ctx->options & E2F_OPT_READONLY) ||
59	    !(sb->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_QUOTA))
60		return;
61
62	pctx.ino = sb->s_usr_quota_inum;
63	if (sb->s_usr_quota_inum &&
64	    (sb->s_usr_quota_inum != EXT4_USR_QUOTA_INO) &&
65	    fix_problem(ctx, PR_0_HIDE_QUOTA, &pctx)) {
66		move_quota_inode(fs, sb->s_usr_quota_inum, EXT4_USR_QUOTA_INO,
67				 USRQUOTA);
68		sb->s_usr_quota_inum = EXT4_USR_QUOTA_INO;
69	}
70
71	pctx.ino = sb->s_grp_quota_inum;
72	if (sb->s_grp_quota_inum &&
73	    (sb->s_grp_quota_inum != EXT4_GRP_QUOTA_INO) &&
74	    fix_problem(ctx, PR_0_HIDE_QUOTA, &pctx)) {
75		move_quota_inode(fs, sb->s_grp_quota_inum, EXT4_GRP_QUOTA_INO,
76				 GRPQUOTA);
77		sb->s_grp_quota_inum = EXT4_GRP_QUOTA_INO;
78	}
79
80	return;
81}
82