File 0125-btrfs-progs-Add-the-ability-to-use-the-ear... of Package btrfsprogs

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File 0125-btrfs-progs-Add-the-ability-to-use-the-earliest-supe.patch of Package btrfsprogs (Revision fad05b87f11e2d3b079c581a72bba7b5)

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From 6330d8d3b70c0ad35ce8048ccf69b3e96718ed53 Mon Sep 17 00:00:00 2001
From: David Marcin <djmarcin@google.com>
Date: Mon, 21 Nov 2011 20:31:01 -0600
Subject: [PATCH 26/35] btrfs-progs: Add the ability to use the earliest super
 found when opening the ctree.

diff --git a/convert.c b/convert.c
index 291dc27..c036f46 100644
--- a/convert.c
+++ b/convert.c
@@ -2386,7 +2386,7 @@ int do_convert(const char *devname, int datacsum, int packing, int noxattr)
 		fprintf(stderr, "unable to update system chunk\n");
 		goto fail;
 	}
-	root = open_ctree_fd(fd, devname, super_bytenr, O_RDWR);
+	root = open_ctree_fd(fd, devname, super_bytenr, O_RDWR, 0);
 	if (!root) {
 		fprintf(stderr, "unable to open ctree\n");
 		goto fail;
@@ -2447,7 +2447,7 @@ int do_convert(const char *devname, int datacsum, int packing, int noxattr)
 		goto fail;
 	}
 
-	root = open_ctree_fd(fd, devname, 0, O_RDWR);
+	root = open_ctree_fd(fd, devname, 0, O_RDWR, 0);
 	if (!root) {
 		fprintf(stderr, "unable to open ctree\n");
 		goto fail;
@@ -2546,7 +2546,7 @@ int do_rollback(const char *devname, int force)
 		fprintf(stderr, "unable to open %s\n", devname);
 		goto fail;
 	}
-	root = open_ctree_fd(fd, devname, 0, O_RDWR);
+	root = open_ctree_fd(fd, devname, 0, O_RDWR, 0);
 	if (!root) {
 		fprintf(stderr, "unable to open ctree\n");
 		goto fail;
diff --git a/disk-io.c b/disk-io.c
index 408b2d5..a161f15 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -580,7 +580,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 		return fs_info->dev_root;
 	if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 		return fs_info->csum_root;
-	
+
 	BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 	       location->offset != (u64)-1);
 
@@ -602,7 +602,8 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 }
 
 struct btrfs_root *__open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
-				   u64 root_tree_bytenr, int writes)
+				   u64 root_tree_bytenr, int writes,
+				   int use_earliest_bdev)
 {
 	u32 sectorsize;
 	u32 nodesize;
@@ -677,8 +678,14 @@ struct btrfs_root *__open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
 
 	fs_info->super_bytenr = sb_bytenr;
 	disk_super = &fs_info->super_copy;
-	ret = btrfs_read_dev_super(fs_devices->latest_bdev,
-				   disk_super, sb_bytenr);
+	if (use_earliest_bdev) {
+		ret = btrfs_read_dev_super(fs_devices->earliest_bdev,
+					   disk_super, sb_bytenr);
+	} else {
+		ret = btrfs_read_dev_super(fs_devices->latest_bdev,
+					   disk_super, sb_bytenr);
+	}
+
 	if (ret) {
 		printk("No valid btrfs found\n");
 		goto out_devices;
@@ -847,7 +854,7 @@ struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
 		fprintf (stderr, "Could not open %s\n", filename);
 		return NULL;
 	}
-	root = __open_ctree_fd(fp, filename, sb_bytenr, 0, writes);
+	root = __open_ctree_fd(fp, filename, sb_bytenr, 0, writes, 0);
 	close(fp);
 
 	return root;
@@ -871,9 +878,9 @@ struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
 }
 
 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
-				 int writes)
+				 int writes, int use_earliest_bdev)
 {
-	return __open_ctree_fd(fp, path, sb_bytenr, 0, writes);
+	return __open_ctree_fd(fp, path, sb_bytenr, 0, writes, use_earliest_bdev);
 }
 
 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
diff --git a/disk-io.h b/disk-io.h
index 2048fcf..8fdcd91 100644
--- a/disk-io.h
+++ b/disk-io.h
@@ -45,7 +45,7 @@ int clean_tree_block(struct btrfs_trans_handle *trans,
 		     struct btrfs_root *root, struct extent_buffer *buf);
 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes);
 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
-				 int writes);
+				 int writes, int use_earliest_bdev);
 struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
 				       u64 root_tree_bytenr);
 int close_ctree(struct btrfs_root *root);
diff --git a/volumes.c b/volumes.c
index 03bfb8c..cde20ad 100644
--- a/volumes.c
+++ b/volumes.c
@@ -99,6 +99,8 @@ static int device_list_add(const char *path,
 		memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
 		fs_devices->latest_devid = devid;
 		fs_devices->latest_trans = found_transid;
+		fs_devices->earliest_devid = devid;
+		fs_devices->earliest_trans = found_transid;
 		fs_devices->lowest_devid = (u64)-1;
 		device = NULL;
 	} else {
@@ -133,8 +135,11 @@ static int device_list_add(const char *path,
 	if (found_transid > fs_devices->latest_trans) {
 		fs_devices->latest_devid = devid;
 		fs_devices->latest_trans = found_transid;
+	} else if (found_transid < fs_devices->earliest_trans) {
+		fs_devices->earliest_devid = devid;
+		fs_devices->earliest_trans = found_transid;
 	}
-	if (fs_devices->lowest_devid > devid) {
+	if (devid < fs_devices->lowest_devid) {
 		fs_devices->lowest_devid = devid;
 	}
 	*fs_devices_ret = fs_devices;
@@ -183,6 +188,8 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, int flags)
 
 		if (device->devid == fs_devices->latest_devid)
 			fs_devices->latest_bdev = fd;
+		if (device->devid == fs_devices->earliest_devid)
+			fs_devices->earliest_bdev = fd;
 		if (device->devid == fs_devices->lowest_devid)
 			fs_devices->lowest_bdev = fd;
 		device->fd = fd;
diff --git a/volumes.h b/volumes.h
index 7104d36..08c53e4 100644
--- a/volumes.h
+++ b/volumes.h
@@ -64,11 +64,15 @@ struct btrfs_device {
 struct btrfs_fs_devices {
 	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 
-	/* the device with this id has the most recent coyp of the super */
+	/* the device with this id has the most recent copy of the super */
 	u64 latest_devid;
 	u64 latest_trans;
+	/* the device with this id has the least recent copy of the super */
+	u64 earliest_devid;
+	u64 earliest_trans;
 	u64 lowest_devid;
 	int latest_bdev;
+	int earliest_bdev;
 	int lowest_bdev;
 	struct list_head devices;
 	struct list_head list;
-- 
1.7.6.233.gd79bc

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File 0125-btrfs-progs-Add-the-ability-to-use-the-earliest-supe.patch of Package btrfsprogs (Revision fad05b87f11e2d3b079c581a72bba7b5)

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