1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2017-2023 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <djwong@kernel.org>
5 */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_trans_resv.h"
11 #include "xfs_mount.h"
12 #include "xfs_log_format.h"
13 #include "xfs_inode.h"
14 #include "xfs_symlink.h"
15 #include "xfs_health.h"
16 #include "scrub/scrub.h"
17 #include "scrub/common.h"
18 #include "scrub/health.h"
19
20 /* Set us up to scrub a symbolic link. */
21 int
xchk_setup_symlink(struct xfs_scrub * sc)22 xchk_setup_symlink(
23 struct xfs_scrub *sc)
24 {
25 /* Allocate the buffer without the inode lock held. */
26 sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, XCHK_GFP_FLAGS);
27 if (!sc->buf)
28 return -ENOMEM;
29
30 return xchk_setup_inode_contents(sc, 0);
31 }
32
33 /* Symbolic links. */
34
35 int
xchk_symlink(struct xfs_scrub * sc)36 xchk_symlink(
37 struct xfs_scrub *sc)
38 {
39 struct xfs_inode *ip = sc->ip;
40 struct xfs_ifork *ifp;
41 loff_t len;
42 int error = 0;
43
44 if (!S_ISLNK(VFS_I(ip)->i_mode))
45 return -ENOENT;
46
47 if (xchk_file_looks_zapped(sc, XFS_SICK_INO_SYMLINK_ZAPPED)) {
48 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
49 return 0;
50 }
51
52 ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
53 len = ip->i_disk_size;
54
55 /* Plausible size? */
56 if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
57 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
58 return 0;
59 }
60
61 /* Inline symlink? */
62 if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
63 if (len > xfs_inode_data_fork_size(ip) ||
64 len > strnlen(ifp->if_data, xfs_inode_data_fork_size(ip)))
65 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
66 return 0;
67 }
68
69 /* Remote symlink; must read the contents. */
70 error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
71 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
72 return error;
73 if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
74 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
75
76 /* If a remote symlink is clean, it is clearly not zapped. */
77 xchk_mark_healthy_if_clean(sc, XFS_SICK_INO_SYMLINK_ZAPPED);
78 return 0;
79 }
80