File util-linux-mount-reuse-loop-1.patch of Package python-libmount.2661

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File util-linux-mount-reuse-loop-1.patch of Package python-libmount.2661

From 6e258026754ff7db97d6ac390e26ad1cc2e866e0 Mon Sep 17 00:00:00 2001
From: Stanislav Brabec <sbrabec@suse.cz>
Date: Tue, 12 Apr 2016 20:22:36 +0200
Subject: [PATCH 1/4] libmount: Re-organize is_mounted_same_loopfile()

First parse options, then initialize context.
No change in function.
The change is needed for loop device reuse.

Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>
---
 libmount/src/context_loopdev.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

Index: util-linux-2.25/libmount/src/context_loopdev.c
===================================================================
--- util-linux-2.25.orig/libmount/src/context_loopdev.c
+++ util-linux-2.25/libmount/src/context_loopdev.c
@@ -137,7 +137,7 @@ is_mounted_same_loopfile(struct libmnt_c
 int mnt_context_setup_loopdev(struct libmnt_context *cxt)
 {
 	const char *backing_file, *optstr, *loopdev = NULL;
-	char *val = NULL;
+	char *val = NULL, *loopval = NULL;
 	size_t len;
 	struct loopdev_cxt lc;
 	int rc = 0, lo_flags = 0;
@@ -161,10 +161,6 @@ int mnt_context_setup_loopdev(struct lib
 		lo_flags |= LO_FLAGS_READ_ONLY;
 	}
 
-	rc = loopcxt_init(&lc, 0);
-	if (rc)
-		return rc;
-
 	ON_DBG(CXT, loopcxt_enable_debug(&lc, 1));
 
 	optstr = mnt_fs_get_user_options(cxt->fs);
@@ -174,13 +170,8 @@ int mnt_context_setup_loopdev(struct lib
 	 */
 	if (rc == 0 && (cxt->user_mountflags & MNT_MS_LOOP) &&
 	    mnt_optstr_get_option(optstr, "loop", &val, &len) == 0 && val) {
-
-		val = strndup(val, len);
-		rc = val ? loopcxt_set_device(&lc, val) : -ENOMEM;
-		free(val);
-
-		if (rc == 0)
-			loopdev = loopcxt_get_device(&lc);
+		loopval = strndup(val, len);
+		rc = loopval ? 0 : -ENOMEM;
 	}
 
 	/*
@@ -225,6 +216,15 @@ int mnt_context_setup_loopdev(struct lib
 		rc = -EBUSY;
 
 	if (rc)
+		goto done_no_deinit;
+
+	rc = loopcxt_init(&lc, 0);
+	if (rc == 0 && loopval) {
+		rc = loopcxt_set_device(&lc, loopval);
+		if (rc == 0)
+			loopdev = loopcxt_get_device(&lc);
+	}
+	if (rc)
 		goto done;
 
 	/* since 2.6.37 we don't have to store backing filename to mtab
@@ -308,6 +308,8 @@ int mnt_context_setup_loopdev(struct lib
 	}
 done:
 	loopcxt_deinit(&lc);
+done_no_deinit:
+	free(loopval);
 	return rc;
 }

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File util-linux-mount-reuse-loop-1.patch of Package python-libmount.2661

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