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Aivazian" , David Sterba , OGAWA Hirofumi , Muchun Song , Oscar Salvador , David Hildenbrand , linux-mm@kvack.org, linux-aio@kvack.org, Benjamin LaHaise , Jan Kara Subject: [PATCH 18/32] fs: Provide operation for fetching mapping_metadata_bhs Date: Tue, 3 Mar 2026 11:34:07 +0100 Message-ID: <20260303103406.4355-50-jack@suse.cz> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260303101717.27224-1-jack@suse.cz> References: <20260303101717.27224-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4099; i=jack@suse.cz; h=from:subject; bh=B8ZzDQ9fbRZLJZF8E2c6y+7UuxwL5O2XEv5hv9QeeYs=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBpprkt8oRjrNW6Mstokzx9e88TZxMQExL4YrLsU 0p7NbpL1lKJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCaaa5LQAKCRCcnaoHP2RA 2fpiCAC/Cyr1/g1WcjrqVOY1eyJVU9N21shLEK5PL6oHJcDd4EbB2dbTyICrINur7AQIJbVbhKL 6uvymE/zjF+cDiCNrx2rRy7zz+TnSWSfzTvo+430/I+nkN/5UsRKGRflBFEPItTcE9188XUlC3U fv9qefNBvocLUJJz4Dq+DR/UESRjZLCg1dT2QSmiQLhwvW86xwMPw27YDk4t/TIxve2l7z5DT57 f2LVhAbHvrsuPIfToabtCEJH6AbZI4ArlLrrr8ZZ82Ed5bDOPBgZhvhikL89CkVcdkiW8RlfQxu JCh0fP1EjfPvT0hO66Z/NArYeRSbtxuJyD3ZVSj6A57R+ZP0 X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Content-Transfer-Encoding: 8bit X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Action: no action X-Rspamd-Queue-Id: 32D091C0014 X-Rspamd-Server: rspam07 X-Stat-Signature: iweu6t9bawsmc7kbgn1381r3wpr81pep X-Rspam-User: X-HE-Tag: 1772534149-315468 X-HE-Meta: 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 IES916x2 fsYpVGT9xCTczzcLqMqNKcL4quRmQwXwBNcRe72qzc+uO1Wn5dKpiTDXP/FE0sOzv4EYTJVPSkJcrQGQaur9mV+NQz5nBvXdjRNOSdeEvSr6deD/ELi8ea603PNejr6BptkJefPaHqmR1S2utToZUGZN6eHvPkLZOglBJegqCUg0Dr/9rgjhxlVNSLsTuZ0ANB2Xmr9KT0SWzTArth3hGLo/5u5RFAniWIO7mXY7X6hsvgek= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When we move mapping_metadata_bhs to fs-private part of an inode the generic code will need a way to get to this struct from general struct inode. Add inode operation for this similarly to operation for grabbing offset_ctx. Signed-off-by: Jan Kara --- fs/buffer.c | 35 +++++++++++++++++++++++++---------- include/linux/buffer_head.h | 1 + include/linux/fs.h | 1 + 3 files changed, 27 insertions(+), 10 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index d39ae6581c26..d7a1d72302da 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -492,6 +492,20 @@ EXPORT_SYMBOL(mark_buffer_async_write); * b_inode back. */ +void mmb_init(struct mapping_metadata_bhs *mmb) +{ + spin_lock_init(&mmb->lock); + INIT_LIST_HEAD(&mmb->list); +} +EXPORT_SYMBOL(mmb_init); + +static struct mapping_metadata_bhs *inode_get_metadata_bhs(struct inode *inode) +{ + if (inode->i_op->get_metadata_bhs) + return inode->i_op->get_metadata_bhs(inode); + return &inode->i_mapping->i_metadata_bhs; +} + static void __remove_assoc_queue(struct mapping_metadata_bhs *mmb, struct buffer_head *bh) { @@ -518,7 +532,7 @@ static void remove_assoc_queue(struct buffer_head *bh) rcu_read_lock(); mapping = READ_ONCE(bh->b_assoc_map); if (mapping) { - mmb = &mapping->i_metadata_bhs; + mmb = inode_get_metadata_bhs(mapping->host); spin_lock(&mmb->lock); if (bh->b_assoc_map == mapping) __remove_assoc_queue(mmb, bh); @@ -557,7 +571,8 @@ EXPORT_SYMBOL_GPL(inode_has_buffers); */ int sync_mapping_buffers(struct address_space *mapping) { - struct mapping_metadata_bhs *mmb = &mapping->i_metadata_bhs; + struct mapping_metadata_bhs *mmb = + inode_get_metadata_bhs(mapping->host); struct buffer_head *bh; int err = 0; struct blk_plug plug; @@ -721,15 +736,15 @@ void write_boundary_block(struct block_device *bdev, void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode) { - struct address_space *mapping = inode->i_mapping; - mark_buffer_dirty(bh); if (!bh->b_assoc_map) { - spin_lock(&mapping->i_metadata_bhs.lock); - list_move_tail(&bh->b_assoc_buffers, - &mapping->i_metadata_bhs.list); - bh->b_assoc_map = mapping; - spin_unlock(&mapping->i_metadata_bhs.lock); + struct mapping_metadata_bhs *mmb; + + mmb = inode_get_metadata_bhs(inode); + spin_lock(&mmb->lock); + list_move_tail(&bh->b_assoc_buffers, &mmb->list); + bh->b_assoc_map = inode->i_mapping; + spin_unlock(&mmb->lock); } } EXPORT_SYMBOL(mark_buffer_dirty_inode); @@ -806,7 +821,7 @@ EXPORT_SYMBOL(block_dirty_folio); void invalidate_inode_buffers(struct inode *inode) { if (inode_has_buffers(inode)) { - struct mapping_metadata_bhs *mmb = &inode->i_data.i_metadata_bhs; + struct mapping_metadata_bhs *mmb = inode_get_metadata_bhs(inode); spin_lock(&mmb->lock); while (!list_empty(&mmb->list)) diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 631bf971efc0..623ee66d41a8 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -515,6 +515,7 @@ bool block_dirty_folio(struct address_space *mapping, struct folio *folio); void buffer_init(void); bool try_to_free_buffers(struct folio *folio); +void mmb_init(struct mapping_metadata_bhs *mmb); int inode_has_buffers(struct inode *inode); void invalidate_inode_buffers(struct inode *inode); int sync_mapping_buffers(struct address_space *mapping); diff --git a/include/linux/fs.h b/include/linux/fs.h index 64771a55adc5..b4d9be1fefa4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2046,6 +2046,7 @@ struct inode_operations { struct dentry *dentry, struct file_kattr *fa); int (*fileattr_get)(struct dentry *dentry, struct file_kattr *fa); struct offset_ctx *(*get_offset_ctx)(struct inode *inode); + struct mapping_metadata_bhs *(*get_metadata_bhs)(struct inode *inode); } ____cacheline_aligned; /* Did the driver provide valid mmap hook configuration? */ -- 2.51.0