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View File libmount-add-special-MNT_ERR-codes.patch of Package util-linux (Project Base:System)

From 47dea49b4cb4a4a98a6c518cc17f6d2c92be9528 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Tue, 24 Apr 2012 11:57:32 +0200
Subject: [PATCH] libmount: add special MNT_ERR_ codes

... to detect some situations where standard -errno is too generic.

Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Petr Uzel <petr.uzel@suse.cz>
---
 libmount/src/context.c     |   20 ++++++++++----------
 libmount/src/libmount.h.in |   12 ++++++++++++
 2 files changed, 22 insertions(+), 10 deletions(-)

Index: util-linux-2.21.2/libmount/src/context.c
===================================================================
--- util-linux-2.21.2.orig/libmount/src/context.c
+++ util-linux-2.21.2/libmount/src/context.c
@@ -1186,7 +1186,7 @@ int mnt_context_prepare_srcpath(struct l
 		if (cache)
 			path = mnt_resolve_tag(t, v, cache);
 
-		rc = path ? mnt_fs_set_source(cxt->fs, path) : -EINVAL;
+		rc = path ? mnt_fs_set_source(cxt->fs, path) : -MNT_ERR_NOSOURCE;
 
 	} else if (cache && !mnt_fs_is_pseudofs(cxt->fs)) {
 		/*
@@ -1247,7 +1247,7 @@ int mnt_context_prepare_target(struct li
 	cache = mnt_context_get_cache(cxt);
 	if (cache) {
 		char *path = mnt_resolve_path(tgt, cache);
-		if (strcmp(path, tgt))
+		if (path && strcmp(path, tgt) != 0)
 			rc = mnt_fs_set_target(cxt->fs, path);
 	}
 
@@ -1543,7 +1543,7 @@ static int apply_table(struct libmnt_con
 	}
 
 	if (!fs)
-		return -EINVAL;
+		return -MNT_ERR_NOFSTAB;	/* not found */
 
 	DBG(CXT, mnt_debug_h(cxt, "apply entry:"));
 	DBG(CXT, mnt_fs_print_debug(fs, stderr));
Index: util-linux-2.21.2/libmount/src/libmount.h.in
===================================================================
--- util-linux-2.21.2.orig/libmount/src/libmount.h.in
+++ util-linux-2.21.2/libmount/src/libmount.h.in
@@ -115,6 +115,18 @@ enum {
 	MNT_ACT_UMOUNT
 };
 
+/*
+ * Errors -- by default libmount returns -errno for generic errors (ENOMEM,
+ * EINVAL, ...) and for mount(2) errors, but for some specific operations it
+ * returns private error codes. Note that maximum system errno value should be
+ * 4095 on UNIXes.
+ *
+ * See also mnt_context_get_syscall_errno() and mnt_context_get_helper_status().
+ */
+#define MNT_ERR_NOFSTAB      5000	/* not found required entry in fstab */
+#define MNT_ERR_NOFSTYPE     5001	/* failed to detect filesystem type */
+#define MNT_ERR_NOSOURCE     5002	/* required mount source undefined */
+
 /* init.c */
 extern void mnt_init_debug(int mask);