util linux patches

Signed-off-by: basebuilder_pel7ppc64bebuilder0 <basebuilder@powerel.org>
7 years ago · 9b72b46e08
1 changed files with 175 additions and 0 deletions
--- a/SOURCES/0085-libblkid-store-only-canonical-devnames-to-the-cache.patch
+++ b/SOURCES/0085-libblkid-store-only-canonical-devnames-to-the-cache.patch
@ -0,0 +1,175 @@
				@@ -0,0 +1,175 @@
+From 75b6c0e045abb7e07773b924237c562ab9920c60 Mon Sep 17 00:00:00 2001
+From: Karel Zak <kzak@redhat.com>
+Date: Thu, 26 May 2016 12:02:12 +0200
+Subject: [PATCH 85/86] libblkid: store only canonical devnames to the cache
+
+Let's try to use symlink:
+
+ # ls -la /dev/block/8\:1
+ # lrwxrwxrwx 1 root root 7 May 25 16:42 /dev/block/8:1 -> ../sda1
+
+ # blkid /dev/block/8:1
+ /dev/block/8:3: LABEL="HOME" UUID="196972ad-3b13-4bba-ac54-4cb3f7b409a4" TYPE="ext4" PARTUUID="6073277f-87bc-43ff-bcfd-724c4484a63a"
+
+unfortunately the symlink is stored to the cache:
+
+ <device DEVNO="0x0803" TIME="1464253300.715279" LABEL="HOME" UUID="196972ad-3b13-4bba-ac54-4cb3f7b409a4" TYPE="ext4" PARTUUID="6073277f-87bc-43ff-bcfd-724c4484a63a">/dev/block/8:3</device>
+
+next time if you ask for LABEL=HOME the answer will be /dev/block/8:3
+rather than /dev/sda3.
+
+It seems better to canonicalize the paths we store to the cache.
+
+Unfortunately if you ask for /dev/block/8:3 then you probably expect
+that blkid_dev_devname() returns the same path. This patch introduces
+dev->bid_xname, this is the path used by application (and never stored
+in the cache).
+
+Upstream: http://github.com/karelzak/util-linux/commit/924c93d9df118338fd54cd73b4a45ccddc4ac103
+Addresses: http://bugzilla.redhat.com/show_bug.cgi?id=1007734
+Signed-off-by: Karel Zak <kzak@redhat.com>
+---
+ libblkid/src/blkidP.h  |  4 +++-
+ libblkid/src/dev.c     | 11 +++++++++--
+ libblkid/src/devname.c | 43 +++++++++++++++++++++++++++++++++++++------
+ 3 files changed, 49 insertions(+), 9 deletions(-)
+
+diff --git a/libblkid/src/blkidP.h b/libblkid/src/blkidP.h
+index 7de84b4..8183c12 100644
+--- a/libblkid/src/blkidP.h
+++ b/libblkid/src/blkidP.h
+@@ -44,7 +44,7 @@ struct blkid_struct_dev
+	struct list_head	bid_devs;	/* All devices in the cache */
+	struct list_head	bid_tags;	/* All tags for this device */
+	blkid_cache		bid_cache;	/* Dev belongs to this cache */
+-	char			*bid_name;	/* Device inode pathname */
+	char			*bid_name;	/* Device real pathn (as used in cache) */
+	char			*bid_type;	/* Preferred device TYPE */
+	int			bid_pri;	/* Device priority */
+	dev_t			bid_devno;	/* Device major/minor number */
+@@ -53,6 +53,8 @@ struct blkid_struct_dev
+	unsigned int		bid_flags;	/* Device status bitflags */
+	char			*bid_label;	/* Shortcut to device LABEL */
+	char			*bid_uuid;	/* Shortcut to binary UUID */
+
+	char			*bid_xname;	/* Device path as used by application (maybe symlink..) */
+ };
+
+ #define BLKID_BID_FL_VERIFIED	0x0001	/* Device data validated from disk */
+diff --git a/libblkid/src/dev.c b/libblkid/src/dev.c
+index a4b2aea..d2fd3f4 100644
+--- a/libblkid/src/dev.c
+++ b/libblkid/src/dev.c
+@@ -60,16 +60,23 @@ void blkid_free_dev(blkid_dev dev)
+					   bit_tags);
+		blkid_free_tag(tag);
+	}
+	free(dev->bid_xname);
+	free(dev->bid_name);
+	free(dev);
+ }
+
+ /*
+- * Given a blkid device, return its name
+ * Given a blkid device, return its name. The function returns the name
+ * previously used for blkid_get_dev(). This name does not have to be canonical
+ * (real path) name, but for example symlink.
+  */
+ const char *blkid_dev_devname(blkid_dev dev)
+ {
+-	return dev ? dev->bid_name : NULL;
+	if (!dev)
+		return NULL;
+	if (dev->bid_xname)
+		return dev->bid_xname;
+	return dev->bid_name;
+ }
+
+ #ifdef CONFIG_BLKID_DEBUG
+diff --git a/libblkid/src/devname.c b/libblkid/src/devname.c
+index 497deaf..55b9594 100644
+--- a/libblkid/src/devname.c
+++ b/libblkid/src/devname.c
+@@ -51,28 +51,55 @@ blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
+ {
+	blkid_dev dev = NULL, tmp;
+	struct list_head *p, *pnext;
+	char *cn = NULL;
+
+	if (!cache || !devname)
+		return NULL;
+
+	/* search by name */
+	list_for_each(p, &cache->bic_devs) {
+		tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
+		if (strcmp(tmp->bid_name, devname))
+			continue;
+-
+-		DBG(DEVNAME, blkid_debug("found devname %s in cache", tmp->bid_name));
+		dev = tmp;
+		break;
+	}
+
+	/* try canonicalize the name */
+	if (!dev && (cn = canonicalize_path(devname))) {
+		if (strcmp(cn, devname) != 0) {
+			DBG(DEVNAME, blkid_debug("search cannonical %s", cn));
+			list_for_each(p, &cache->bic_devs) {
+				tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
+				if (strcmp(tmp->bid_name, cn))
+					continue;
+				dev = tmp;
+
+				/* update name returned by blkid_dev_devname() */
+				free(dev->bid_xname);
+				dev->bid_xname = strdup(devname);
+				break;
+			}
+		} else {
+			free(cn);
+			cn = NULL;
+		}
+	}
+
+	if (!dev && (flags & BLKID_DEV_CREATE)) {
+		if (access(devname, F_OK) < 0)
+-			return NULL;
+			goto done;
+		dev = blkid_new_dev();
+		if (!dev)
+-			return NULL;
+			goto done;
+		dev->bid_time = INT_MIN;
+-		dev->bid_name = strdup(devname);
+		if (cn) {
+			dev->bid_name = cn;
+			dev->bid_xname = strdup(devname);
+			cn = NULL;	/* see free() below */
+		} else
+			dev->bid_name = strdup(devname);
+
+		dev->bid_cache = cache;
+		list_add_tail(&dev->bid_devs, &cache->bic_devs);
+		cache->bic_flags |= BLKID_BIC_FL_CHANGED;
+@@ -81,7 +108,7 @@ blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
+	if (flags & BLKID_DEV_VERIFY) {
+		dev = blkid_verify(cache, dev);
+		if (!dev || !(dev->bid_flags & BLKID_BID_FL_VERIFIED))
+-			return dev;
+			goto done;
+		/*
+		 * If the device is verified, then search the blkid
+		 * cache for any entries that match on the type, uuid,
+@@ -112,6 +139,10 @@ blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
+				blkid_free_dev(dev2);
+		}
+	}
+done:
+	if (dev)
+		DBG(DEVNAME, blkid_debug("%s requested, found %s in cache", devname, dev->bid_name));
+	free(cn);
+	return dev;
+ }
+
+--
+2.7.4