btrfs: convert latest_bdev type to btrfs_device and rename

Commit d24fa5c1da08026be9959baca309fa0adf8708bf upstream.

In preparation to fix a bug in btrfs_show_devname().

Convert fs_devices::latest_bdev type from struct block_device to struct
btrfs_device and, rename the member to fs_devices::latest_dev.
So that btrfs_show_devname() can use fs_devices::latest_dev::name.

Tested-by: Su Yue <l@damenly.su>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c37239c..6a804e9 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3229,12 +3229,12 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
        mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
        btrfs_init_btree_inode(fs_info);
 
-       invalidate_bdev(fs_devices->latest_bdev);
+       invalidate_bdev(fs_devices->latest_dev->bdev);
 
        /*
         * Read super block and check the signature bytes only
         */
-       disk_super = btrfs_read_dev_super(fs_devices->latest_bdev);
+       disk_super = btrfs_read_dev_super(fs_devices->latest_dev->bdev);
        if (IS_ERR(disk_super)) {
                err = PTR_ERR(disk_super);
                goto fail_alloc;
@@ -3466,7 +3466,7 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
         * below in btrfs_init_dev_replace().
         */
        btrfs_free_extra_devids(fs_devices);
-       if (!fs_devices->latest_bdev) {
+       if (!fs_devices->latest_dev->bdev) {
                btrfs_err(fs_info, "failed to read devices");
                goto fail_tree_roots;
        }

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index beac825..17f7757 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3327,7 +3327,7 @@ static int alloc_new_bio(struct btrfs_inode *inode,
        if (wbc) {
                struct block_device *bdev;
 
-               bdev = fs_info->fs_devices->latest_bdev;
+               bdev = fs_info->fs_devices->latest_dev->bdev;
                bio_set_dev(bio, bdev);
                wbc_init_bio(wbc, bio);
        }

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 61b4651..4af74b6 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7967,7 +7967,7 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
                iomap->type = IOMAP_MAPPED;
        }
        iomap->offset = start;
-       iomap->bdev = fs_info->fs_devices->latest_bdev;
+       iomap->bdev = fs_info->fs_devices->latest_dev->bdev;
        iomap->length = len;
 
        if (write && btrfs_use_zone_append(BTRFS_I(inode), em->block_start))

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 537d90b..e4963da 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1705,7 +1705,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
                goto error_close_devices;
        }
 
-       bdev = fs_devices->latest_bdev;
+       bdev = fs_devices->latest_dev->bdev;
        s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC,
                 fs_info);
        if (IS_ERR(s)) {

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 7bf09ca..3cf4fe4 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1092,7 +1092,7 @@ void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices)
        list_for_each_entry(seed_dev, &fs_devices->seed_list, seed_list)
                __btrfs_free_extra_devids(seed_dev, &latest_dev);
 
-       fs_devices->latest_bdev = latest_dev->bdev;
+       fs_devices->latest_dev = latest_dev;
 
        mutex_unlock(&uuid_mutex);
 }
@@ -1225,7 +1225,7 @@ static int open_fs_devices(struct btrfs_fs_devices *fs_devices,
                return -EINVAL;
 
        fs_devices->opened = 1;
-       fs_devices->latest_bdev = latest_dev->bdev;
+       fs_devices->latest_dev = latest_dev;
        fs_devices->total_rw_bytes = 0;
        fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_REGULAR;
        fs_devices->read_policy = BTRFS_READ_POLICY_PID;
@@ -1993,7 +1993,7 @@ static struct btrfs_device * btrfs_find_next_active_device(
 }
 
 /*
- * Helper function to check if the given device is part of s_bdev / latest_bdev
+ * Helper function to check if the given device is part of s_bdev / latest_dev
  * and replace it with the provided or the next active device, in the context
  * where this function called, there should be always be another device (or
  * this_dev) which is active.
@@ -2012,8 +2012,8 @@ void __cold btrfs_assign_next_active_device(struct btrfs_device *device,
                        (fs_info->sb->s_bdev == device->bdev))
                fs_info->sb->s_bdev = next_device->bdev;
 
-       if (fs_info->fs_devices->latest_bdev == device->bdev)
-               fs_info->fs_devices->latest_bdev = next_device->bdev;
+       if (fs_info->fs_devices->latest_dev->bdev == device->bdev)
+               fs_info->fs_devices->latest_dev = next_device;
 }
 
 /*

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 2183361..4db10d0 100644 (file)
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -246,7 +246,11 @@ struct btrfs_fs_devices {
        /* Highest generation number of seen devices */
        u64 latest_generation;
 
-       struct block_device *latest_bdev;
+       /*
+        * The mount device or a device with highest generation after removal
+        * or replace.
+        */
+       struct btrfs_device *latest_dev;
 
        /* all of the devices in the FS, protected by a mutex
         * so we can safely walk it to write out the supers without