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Diffstat (limited to 'fs/xfs/scrub/symlink.c')
-rw-r--r--fs/xfs/scrub/symlink.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/fs/xfs/scrub/symlink.c b/fs/xfs/scrub/symlink.c
new file mode 100644
index 000000000000..3aa3d60f7c16
--- /dev/null
+++ b/fs/xfs/scrub/symlink.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#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_defer.h"
+#include "xfs_btree.h"
+#include "xfs_bit.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_inode.h"
+#include "xfs_inode_fork.h"
+#include "xfs_symlink.h"
+#include "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/trace.h"
+
+/* Set us up to scrub a symbolic link. */
+int
+xfs_scrub_setup_symlink(
+ struct xfs_scrub_context *sc,
+ struct xfs_inode *ip)
+{
+ /* Allocate the buffer without the inode lock held. */
+ sc->buf = kmem_zalloc_large(XFS_SYMLINK_MAXLEN + 1, KM_SLEEP);
+ if (!sc->buf)
+ return -ENOMEM;
+
+ return xfs_scrub_setup_inode_contents(sc, ip, 0);
+}
+
+/* Symbolic links. */
+
+int
+xfs_scrub_symlink(
+ struct xfs_scrub_context *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_d.di_size;
+
+ /* Plausible size? */
+ if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
+ xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+ goto out;
+ }
+
+ /* Inline symlink? */
+ if (ifp->if_flags & XFS_IFINLINE) {
+ if (len > XFS_IFORK_DSIZE(ip) ||
+ len > strnlen(ifp->if_u1.if_data, XFS_IFORK_DSIZE(ip)))
+ xfs_scrub_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 (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
+ goto out;
+ if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
+ xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+out:
+ return error;
+}