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writeback: prep helpers for dirty-limit and writeback accounting

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Add helper APIs needed by filesystems to avoid poking into writeback
internals.

Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kundan Kumar <kundan.kumar@samsung.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Link: https://patch.msgid.link/20260213054634.79785-2-kundan.kumar@samsung.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Kundan Kumar
2026-02-13 11:16:31 +05:30
committed by Christian Brauner
parent 9702969978
commit a235d3bcd2
1 changed files with 13 additions and 0 deletions
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13
include/linux/backing-dev.h
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@@ -136,6 +136,19 @@ static inline bool mapping_can_writeback(struct address_space *mapping)
return inode_to_bdi(mapping->host)->capabilities & BDI_CAP_WRITEBACK;
}
/* Must not be used by file systems that support cgroup writeback */
static inline int bdi_wb_dirty_exceeded(struct backing_dev_info *bdi)
{
return bdi->wb.dirty_exceeded;
}
/* Must not be used by file systems that support cgroup writeback */
static inline void bdi_wb_stat_mod(struct inode *inode, enum wb_stat_item item,
s64 amount)
{
wb_stat_mod(&inode_to_bdi(inode)->wb, item, amount);
}
#ifdef CONFIG_CGROUP_WRITEBACK
struct bdi_writeback *wb_get_lookup(struct backing_dev_info *bdi,