From 521bea7cec8a79684402d555caab408ed43171d5 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 26 Mar 2026 10:54:24 +0100 Subject: fs: Move metadata bhs tracking to a separate struct Instead of tracking metadata bhs for a mapping using i_private_list and i_private_lock create a dedicated mapping_metadata_bhs struct for it. So far this struct is embedded in address_space but that will be switched for per-fs private inode parts later in the series. This also changes the locking from bdev mapping's i_private_lock to a new lock embedded in mapping_metadata_bhs to untangle the i_private_lock locking for maintaining lists of metadata bhs and the locking for looking up / reclaiming bdev's buffer heads. The locking in remove_assoc_map() gets more complex due to this but overall this looks like a reasonable tradeoff. Reviewed-by: Christoph Hellwig Signed-off-by: Jan Kara Link: https://patch.msgid.link/20260326095354.16340-72-jack@suse.cz Signed-off-by: Christian Brauner --- include/linux/fs.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include') diff --git a/include/linux/fs.h b/include/linux/fs.h index d488459396f4..76360b0040e0 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -445,6 +445,12 @@ struct address_space_operations { extern const struct address_space_operations empty_aops; +/* Structure for tracking metadata buffer heads associated with the mapping */ +struct mapping_metadata_bhs { + spinlock_t lock; /* Lock protecting bh list */ + struct list_head list; /* The list of bhs (b_assoc_buffers) */ +}; + /** * struct address_space - Contents of a cacheable, mappable object. * @host: Owner, either the inode or the block_device. @@ -484,6 +490,7 @@ struct address_space { errseq_t wb_err; spinlock_t i_private_lock; struct list_head i_private_list; + struct mapping_metadata_bhs i_metadata_bhs; struct rw_semaphore i_mmap_rwsem; } __attribute__((aligned(sizeof(long)))) __randomize_layout; /* -- cgit v1.2.3