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porting: document block device freeze and thaw changes 

Link: https://lore.kernel.org/r/20230927-vfs-super-freeze-v1-7-ecc36d9ab4d9@kernel.org
Link: https://lore.kernel.org/r/20231024-vfs-super-freeze-v2-9-599c19f4faac@kernel.org
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2023-10-24 15:01:15 +02:00
parent 97cbed04e7
commit 01bc8e9ae2
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Documentation/filesystems/porting.rst
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@ -1061,3 +1061,15 @@ export_operations ->encode_fh() no longer has a default implementation to
encode FILEID_INO32_GEN* file handles.
Filesystems that used the default implementation may use the generic helper
generic_encode_ino32_fh() explicitly.
---
**recommended**
Block device freezing and thawing have been moved to holder operations.
Before this change, get_active_super() would only be able to find the
superblock of the main block device, i.e., the one stored in sb->s_bdev. Block
device freezing now works for any block device owned by a given superblock, not
just the main block device. The get_active_super() helper and bd_fsfreeze_sb
pointer are gone.