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 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 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