UBIFS: introduce more I/O helpers
Introduce the following I/O helper functions: 'ubifs_leb_read()',
'ubifs_leb_write()', 'ubifs_leb_change()', 'ubifs_leb_unmap()',
'ubifs_leb_map()', 'ubifs_is_mapped().
The idea is to wrap all UBI I/O functions in order to encapsulate various
assertions and error path handling (error message, stack dump, switching to R/O
mode). And there are some other benefits of this which will be used in the
following patches.
This patch does not switch whole UBIFS to use these functions yet.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index 48e1680..239899d 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -90,6 +90,123 @@
}
}
+/*
+ * Below are simple wrappers over UBI I/O functions which include some
+ * additional checks and UBIFS debugging stuff. See corresponding UBI function
+ * for more information.
+ */
+
+int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs,
+ int len, int even_ebadmsg)
+{
+ int err;
+
+ err = ubi_read(c->ubi, lnum, buf, offs, len);
+ /*
+ * In case of %-EBADMSG print the error message only if the
+ * @even_ebadmsg is true.
+ */
+ if (err && (err != -EBADMSG || even_ebadmsg)) {
+ ubifs_err("reading %d bytes from LEB %d:%d failed, error %d",
+ len, lnum, offs, err);
+ dbg_dump_stack();
+ }
+ return err;
+}
+
+int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
+ int len, int dtype)
+{
+ int err;
+
+ ubifs_assert(!c->ro_media && !c->ro_mount);
+ if (c->ro_error)
+ return -EROFS;
+ if (!dbg_is_tst_rcvry(c))
+ err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
+ else
+ err = dbg_leb_write(c->ubi, lnum, buf, offs, len, dtype);
+ if (err) {
+ ubifs_err("writing %d bytes to LEB %d:%d failed, error %d",
+ len, lnum, offs, err);
+ ubifs_ro_mode(c, err);
+ dbg_dump_stack();
+ }
+ return err;
+}
+
+int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len,
+ int dtype)
+{
+ int err;
+
+ ubifs_assert(!c->ro_media && !c->ro_mount);
+ if (c->ro_error)
+ return -EROFS;
+ if (!dbg_is_tst_rcvry(c))
+ err = ubi_leb_change(c->ubi, lnum, buf, len, dtype);
+ else
+ err = dbg_leb_change(c->ubi, lnum, buf, len, dtype);
+ if (err) {
+ ubifs_err("changing %d bytes in LEB %d failed, error %d",
+ len, lnum, err);
+ ubifs_ro_mode(c, err);
+ dbg_dump_stack();
+ }
+ return err;
+}
+
+int ubifs_leb_unmap(struct ubifs_info *c, int lnum)
+{
+ int err;
+
+ ubifs_assert(!c->ro_media && !c->ro_mount);
+ if (c->ro_error)
+ return -EROFS;
+ if (!dbg_is_tst_rcvry(c))
+ err = ubi_leb_unmap(c->ubi, lnum);
+ else
+ err = dbg_leb_unmap(c->ubi, lnum);
+ if (err) {
+ ubifs_err("unmap LEB %d failed, error %d", lnum, err);
+ ubifs_ro_mode(c, err);
+ dbg_dump_stack();
+ }
+ return err;
+}
+
+int ubifs_leb_map(struct ubifs_info *c, int lnum, int dtype)
+{
+ int err;
+
+ ubifs_assert(!c->ro_media && !c->ro_mount);
+ if (c->ro_error)
+ return -EROFS;
+ if (!dbg_is_tst_rcvry(c))
+ err = ubi_leb_map(c->ubi, lnum, dtype);
+ else
+ err = dbg_leb_map(c->ubi, lnum, dtype);
+ if (err) {
+ ubifs_err("mapping LEB %d failed, error %d", lnum, err);
+ ubifs_ro_mode(c, err);
+ dbg_dump_stack();
+ }
+ return err;
+}
+
+int ubifs_is_mapped(const struct ubifs_info *c, int lnum)
+{
+ int err;
+
+ err = ubi_is_mapped(c->ubi, lnum);
+ if (err < 0) {
+ ubifs_err("ubi_is_mapped failed for LEB %d, error %d",
+ lnum, err);
+ dbg_dump_stack();
+ }
+ return err;
+}
+
/**
* ubifs_check_node - check node.
* @c: UBIFS file-system description object