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btrfs: convert latest_bdev type to btrfs_device and rename

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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>
This commit is contained in:
Anand Jain 2021-08-24 13:05:19 +08:00 committed by David Sterba
parent 7ae9bd1803
commit d24fa5c1da
6 changed files with 16 additions and 12 deletions
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6
fs/btrfs/disk-io.c
View File

@ -3231,12 +3231,12 @@ 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;
@ -3473,7 +3473,7 @@ 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;
}

2
fs/btrfs/extent_io.c
View File

@ -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);
}

2
fs/btrfs/inode.c
View File

@ -7965,7 +7965,7 @@ 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))

2
fs/btrfs/super.c
View File

@ -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)) {

10
fs/btrfs/volumes.c
View File

@ -1091,7 +1091,7 @@ 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);
}
@ -1222,7 +1222,7 @@ 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;
@ -1986,7 +1986,7 @@ 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.
@ -2005,8 +2005,8 @@ 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;
}
/*

6
fs/btrfs/volumes.h
View File

@ -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