tree: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git vectorized-scrub
head: 1fcd9cea011a657d62ee332d161966c1ec92ffd5
commit: 75be7c3d8d488788289ec6e343e138db5a2b2440 [150/401] xfs: teach repair to fix file nlinks
config: microblaze-randconfig-m031-20220601 (https://download.01.org/0day-ci/archive/20220602/[email protected]/config)
compiler: microblaze-linux-gcc (GCC) 11.3.0
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
New smatch warnings:
fs/xfs/scrub/nlinks_repair.c:80 xrep_nlinks_repair_inode() warn: missing error code 'error'
vim +/error +80 fs/xfs/scrub/nlinks_repair.c
75be7c3d8d4887 Darrick J. Wong 2022-01-06 42 STATIC int
75be7c3d8d4887 Darrick J. Wong 2022-01-06 43 xrep_nlinks_repair_inode(
75be7c3d8d4887 Darrick J. Wong 2022-01-06 44 struct xchk_nlink_ctrs *xnc)
75be7c3d8d4887 Darrick J. Wong 2022-01-06 45 {
75be7c3d8d4887 Darrick J. Wong 2022-01-06 46 struct xchk_nlink obs;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 47 struct xfs_scrub *sc = xnc->sc;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 48 struct xfs_mount *mp = sc->mp;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 49 struct xfs_inode *ip = sc->ip;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 50 uint64_t total_links;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 51 unsigned int actual_nlink;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 52 int error;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 53
75be7c3d8d4887 Darrick J. Wong 2022-01-06 54 xfs_ilock(ip, XFS_IOLOCK_EXCL);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 55
75be7c3d8d4887 Darrick J. Wong 2022-01-06 56 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0, &sc->tp);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 57 if (error)
75be7c3d8d4887 Darrick J. Wong 2022-01-06 58 goto out_iolock;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 59
75be7c3d8d4887 Darrick J. Wong 2022-01-06 60 xfs_ilock(ip, XFS_ILOCK_EXCL);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 61 xfs_trans_ijoin(sc->tp, ip, 0);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 62
75be7c3d8d4887 Darrick J. Wong 2022-01-06 63 mutex_lock(&xnc->lock);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 64
75be7c3d8d4887 Darrick J. Wong 2022-01-06 65 if (xchk_iscan_aborted(&xnc->collect_iscan)) {
75be7c3d8d4887 Darrick J. Wong 2022-01-06 66 error = -ECANCELED;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 67 goto out_scanlock;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 68 }
75be7c3d8d4887 Darrick J. Wong 2022-01-06 69
75be7c3d8d4887 Darrick J. Wong 2022-01-06 70 error = xfarray_load_sparse(xnc->nlinks, ip->i_ino, &obs);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 71 if (error)
75be7c3d8d4887 Darrick J. Wong 2022-01-06 72 goto out_scanlock;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 73
75be7c3d8d4887 Darrick J. Wong 2022-01-06 74 total_links = xchk_nlink_total(&obs);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 75 actual_nlink = VFS_I(ip)->i_nlink;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 76
75be7c3d8d4887 Darrick J. Wong 2022-01-06 77 /* Cannot set more than the maxiumum possible link count. */
75be7c3d8d4887 Darrick J. Wong 2022-01-06 78 if (total_links > U32_MAX) {
75be7c3d8d4887 Darrick J. Wong 2022-01-06 79 trace_xrep_nlinks_unfixable_inode(mp, ip, &obs);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 @80 goto out_scanlock;
Needs error code
75be7c3d8d4887 Darrick J. Wong 2022-01-06 81 }
75be7c3d8d4887 Darrick J. Wong 2022-01-06 82
75be7c3d8d4887 Darrick J. Wong 2022-01-06 83 /*
75be7c3d8d4887 Darrick J. Wong 2022-01-06 84 * Linked directories should have at least one "child" (the dot entry)
75be7c3d8d4887 Darrick J. Wong 2022-01-06 85 * pointing up to them.
75be7c3d8d4887 Darrick J. Wong 2022-01-06 86 */
75be7c3d8d4887 Darrick J. Wong 2022-01-06 87 if (S_ISDIR(VFS_I(ip)->i_mode) && actual_nlink > 0 &&
75be7c3d8d4887 Darrick J. Wong 2022-01-06 88 obs.children == 0) {
75be7c3d8d4887 Darrick J. Wong 2022-01-06 89 trace_xrep_nlinks_unfixable_inode(mp, ip, &obs);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 90 goto out_scanlock;
Here too
75be7c3d8d4887 Darrick J. Wong 2022-01-06 91 }
75be7c3d8d4887 Darrick J. Wong 2022-01-06 92
75be7c3d8d4887 Darrick J. Wong 2022-01-06 93 /* Non-directories cannot have directories pointing up to them. */
75be7c3d8d4887 Darrick J. Wong 2022-01-06 94 if (!S_ISDIR(VFS_I(ip)->i_mode) && obs.children != 0) {
75be7c3d8d4887 Darrick J. Wong 2022-01-06 95 trace_xrep_nlinks_unfixable_inode(mp, ip, &obs);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 96 goto out_scanlock;
Here
75be7c3d8d4887 Darrick J. Wong 2022-01-06 97 }
75be7c3d8d4887 Darrick J. Wong 2022-01-06 98
75be7c3d8d4887 Darrick J. Wong 2022-01-06 99 /*
75be7c3d8d4887 Darrick J. Wong 2022-01-06 100 * We did not find any links to this inode. If the inode agrees, we
75be7c3d8d4887 Darrick J. Wong 2022-01-06 101 * have nothing further to do. If not, the inode has a nonzero link
75be7c3d8d4887 Darrick J. Wong 2022-01-06 102 * count and we don't have anywhere to graft the child onto. Dropping
75be7c3d8d4887 Darrick J. Wong 2022-01-06 103 * a live inode's link count to zero can cause unexpected shutdowns in
75be7c3d8d4887 Darrick J. Wong 2022-01-06 104 * inactivation, so leave it alone.
75be7c3d8d4887 Darrick J. Wong 2022-01-06 105 */
75be7c3d8d4887 Darrick J. Wong 2022-01-06 106 if (total_links == 0) {
75be7c3d8d4887 Darrick J. Wong 2022-01-06 107 if (actual_nlink != 0)
75be7c3d8d4887 Darrick J. Wong 2022-01-06 108 trace_xrep_nlinks_unfixable_inode(mp, ip, &obs);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 109 goto out_scanlock;
These looks like a success path
75be7c3d8d4887 Darrick J. Wong 2022-01-06 110 }
75be7c3d8d4887 Darrick J. Wong 2022-01-06 111
75be7c3d8d4887 Darrick J. Wong 2022-01-06 112 /* Perfect match means we're done. */
75be7c3d8d4887 Darrick J. Wong 2022-01-06 113 if (total_links == actual_nlink)
75be7c3d8d4887 Darrick J. Wong 2022-01-06 114 goto out_scanlock;
Success path
75be7c3d8d4887 Darrick J. Wong 2022-01-06 115 mutex_unlock(&xnc->lock);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 116
75be7c3d8d4887 Darrick J. Wong 2022-01-06 117 /* Commit the new link count. */
75be7c3d8d4887 Darrick J. Wong 2022-01-06 118 trace_xrep_nlinks_update_inode(mp, ip, &obs);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 119
75be7c3d8d4887 Darrick J. Wong 2022-01-06 120 set_nlink(VFS_I(ip), total_links);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 121 xfs_trans_log_inode(sc->tp, ip, XFS_ILOG_CORE);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 122 error = xfs_trans_commit(sc->tp);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 123 sc->tp = NULL;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 124 if (error)
75be7c3d8d4887 Darrick J. Wong 2022-01-06 125 goto out_ilock;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 126
75be7c3d8d4887 Darrick J. Wong 2022-01-06 127 xfs_iunlock(ip, XFS_ILOCK_EXCL);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 128 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 129 return 0;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 130
75be7c3d8d4887 Darrick J. Wong 2022-01-06 131 out_scanlock:
75be7c3d8d4887 Darrick J. Wong 2022-01-06 132 mutex_unlock(&xnc->lock);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 133 xchk_trans_cancel(sc);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 134 out_ilock:
75be7c3d8d4887 Darrick J. Wong 2022-01-06 135 xfs_iunlock(ip, XFS_ILOCK_EXCL);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 136 out_iolock:
75be7c3d8d4887 Darrick J. Wong 2022-01-06 137 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
75be7c3d8d4887 Darrick J. Wong 2022-01-06 138 return error;
75be7c3d8d4887 Darrick J. Wong 2022-01-06 139 }
--
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