[PATCH 5.15 030/177] btrfs: convert latest_bdev type to btrfs_device and rename

Greg Kroah-Hartman
2021-12-20T15:11:52Z

From: Anand Jain <anand.jain@oracle.com>

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>
---
fs/btrfs/disk-io.c | 6 +++---
fs/btrfs/extent_io.c | 2 +-
fs/btrfs/inode.c | 2 +-
fs/btrfs/super.c | 2 +-
fs/btrfs/volumes.c | 10 +++++-----
fs/btrfs/volumes.h | 6 +++++-
6 files changed, 16 insertions(+), 12 deletions(-)

--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3229,12 +3229,12 @@ int __cold open_ctree(struct super_block
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
* 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;
}
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3327,7 +3327,7 @@ static int alloc_new_bio(struct btrfs_in
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);
}
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7967,7 +7967,7 @@ static int btrfs_dio_iomap_begin(struct
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))
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1705,7 +1705,7 @@ static struct dentry *btrfs_mount_root(s
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)) {
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1092,7 +1092,7 @@ void btrfs_free_extra_devids(struct btrf
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_
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_
}

/*
- * 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_dev
(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;
}

/*
--- 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