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