File 0125-btrfs-progs-Add-the-ability-to-use-the-earliest-supe.patch of Package btrfsprogs
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.
Signed-off-by: David Marcin <djmarcin@google.com>
---
convert.c | 6 +++---
disk-io.c | 21 ++++++++++++++-------
disk-io.h | 2 +-
volumes.c | 9 ++++++++-
volumes.h | 6 +++++-
5 files changed, 31 insertions(+), 13 deletions(-)
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
