afs: Improve dir check failure reports

Improve the content of directory check failure reports from:

	kAFS: afs_dir_check_page(6d57): bad magic 1/2 is 0000

to dump more information about the individual blocks in a directory page.

Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 8a2562e3a3163378deb576daeb6129ffa03cfafe..378a96a1116eb4d633585ce18091d00d0200a5f4 100644 (file)
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -159,6 +159,38 @@ error:
        return false;
 }
 
+/*
+ * Check the contents of a directory that we've just read.
+ */
+static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
+{
+       struct afs_xdr_dir_page *dbuf;
+       unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
+
+       for (i = 0; i < req->nr_pages; i++)
+               if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
+                       goto bad;
+       return true;
+
+bad:
+       pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
+               dvnode->fid.vid, dvnode->fid.vnode,
+               req->file_size, req->len, req->actual_len, req->remain);
+       pr_warn("DIR %llx %x %x %x\n",
+               req->pos, req->index, req->nr_pages, req->offset);
+
+       for (i = 0; i < req->nr_pages; i++) {
+               dbuf = kmap(req->pages[i]);
+               for (j = 0; j < qty; j++) {
+                       union afs_xdr_dir_block *block = &dbuf->blocks[j];
+
+                       pr_warn("[%02x] %32phN\n", i * qty + j, block);
+               }
+               kunmap(req->pages[i]);
+       }
+       return false;
+}
+
 /*
  * open an AFS directory file
  */
@@ -288,10 +320,8 @@ retry:
 
                /* Validate the data we just read. */
                ret = -EIO;
-               for (i = 0; i < req->nr_pages; i++)
-                       if (!afs_dir_check_page(dvnode, req->pages[i],
-                                               req->actual_len))
-                               goto error_unlock;
+               if (!afs_dir_check_pages(dvnode, req))
+                       goto error_unlock;
 
                // TODO: Trim excess pages