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_trans.h"
14 #include "xfs_inode.h"
15 #include "xfs_symlink.h"
16 #include "xfs_health.h"
17 #include "xfs_symlink_remote.h"
18 #include "scrub/scrub.h"
19 #include "scrub/common.h"
20 #include "scrub/health.h"
21 #include "scrub/repair.h"
22
23 /* Set us up to scrub a symbolic link. */
24 int
25 xchk_setup_symlink(
26 struct xfs_scrub *sc)
27 {
28 unsigned int resblks = 0;
29 int error;
30
31 /* Allocate the buffer without the inode lock held. */
32 sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, XCHK_GFP_FLAGS);
33 if (!sc->buf)
34 return -ENOMEM;
35
36 if (xchk_could_repair(sc)) {
37 error = xrep_setup_symlink(sc, &resblks);
38 if (error)
39 return error;
40 }
41
42 return xchk_setup_inode_contents(sc, resblks);
43 }
44
45 /* Symbolic links. */
46
47 int
48 xchk_symlink(
49 struct xfs_scrub *sc)
50 {
51 struct xfs_inode *ip = sc->ip;
52 struct xfs_ifork *ifp;
53 loff_t len;
54 int error = 0;
55
56 if (!S_ISLNK(VFS_I(ip)->i_mode))
57 return -ENOENT;
58
59 if (xchk_file_looks_zapped(sc, XFS_SICK_INO_SYMLINK_ZAPPED)) {
60 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
61 return 0;
62 }
63
64 ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
65 len = ip->i_disk_size;
66
67 /* Plausible size? */
68 if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
69 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
70 return 0;
71 }
72
73 /* Inline symlink? */
74 if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
75 if (len > xfs_inode_data_fork_size(ip) ||
76 len > strnlen(ifp->if_data, xfs_inode_data_fork_size(ip)))
77 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
78 return 0;
79 }
80
81 /* Remote symlink; must read the contents. */
82 error = xfs_symlink_remote_read(sc->ip, sc->buf);
83 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
84 return error;
85 if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
86 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
87
88 /* If a remote symlink is clean, it is clearly not zapped. */
89 xchk_mark_healthy_if_clean(sc, XFS_SICK_INO_SYMLINK_ZAPPED);
90 return 0;
91 }
92
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.