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-rw-r--r--fs/xfs/scrub/symlink.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/fs/xfs/scrub/symlink.c b/fs/xfs/scrub/symlink.c
new file mode 100644
index 000000000..75311f8da
--- /dev/null
+++ b/fs/xfs/scrub/symlink.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_log_format.h"
+#include "xfs_inode.h"
+#include "xfs_symlink.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+
+/* Set us up to scrub a symbolic link. */
+int
+xchk_setup_symlink(
+ struct xfs_scrub *sc)
+{
+ /* Allocate the buffer without the inode lock held. */
+ sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, GFP_KERNEL);
+ if (!sc->buf)
+ return -ENOMEM;
+
+ return xchk_setup_inode_contents(sc, 0);
+}
+
+/* Symbolic links. */
+
+int
+xchk_symlink(
+ struct xfs_scrub *sc)
+{
+ struct xfs_inode *ip = sc->ip;
+ struct xfs_ifork *ifp;
+ loff_t len;
+ int error = 0;
+
+ if (!S_ISLNK(VFS_I(ip)->i_mode))
+ return -ENOENT;
+ ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
+ len = ip->i_disk_size;
+
+ /* Plausible size? */
+ if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+ goto out;
+ }
+
+ /* Inline symlink? */
+ if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
+ if (len > xfs_inode_data_fork_size(ip) ||
+ len > strnlen(ifp->if_u1.if_data, xfs_inode_data_fork_size(ip)))
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+ goto out;
+ }
+
+ /* Remote symlink; must read the contents. */
+ error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
+ if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
+ goto out;
+ if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+out:
+ return error;
+}