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writeback: wbc_attach_fdatawrite_inode out of line

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This allows exporting this high-level interface only while keeping
wbc_attach_and_unlock_inode private in fs-writeback.c and unexporting
__inode_attach_wb.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241112054403.1470586-3-hch@lst.de
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-11-12 06:43:55 +01:00 committed by Christian Brauner
parent 4d7485cff5
commit 8182a8b39a
No known key found for this signature in database
GPG key ID: 91C61BC06578DCA2
2 changed files with 29 additions and 30 deletions
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29
fs/fs-writeback.c
View file

@ -290,7 +290,6 @@ void __inode_attach_wb(struct inode *inode, struct folio *folio)
if (unlikely(cmpxchg(&inode->i_wb, NULL, wb))) if (unlikely(cmpxchg(&inode->i_wb, NULL, wb)))
wb_put(wb); wb_put(wb);
} }
EXPORT_SYMBOL_GPL(__inode_attach_wb);
/** /**
* inode_cgwb_move_to_attached - put the inode onto wb->b_attached list * inode_cgwb_move_to_attached - put the inode onto wb->b_attached list
@ -731,7 +730,7 @@ bool cleanup_offline_cgwb(struct bdi_writeback *wb)
* writeback completion, wbc_detach_inode() should be called. This is used * writeback completion, wbc_detach_inode() should be called. This is used
* to track the cgroup writeback context. * to track the cgroup writeback context.
*/ */
void wbc_attach_and_unlock_inode(struct writeback_control *wbc, static void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
struct inode *inode) struct inode *inode)
__releases(&inode->i_lock) __releases(&inode->i_lock)
{ {
@ -763,7 +762,24 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
if (unlikely(wb_dying(wbc->wb) && !css_is_dying(wbc->wb->memcg_css))) if (unlikely(wb_dying(wbc->wb) && !css_is_dying(wbc->wb->memcg_css)))
inode_switch_wbs(inode, wbc->wb_id); inode_switch_wbs(inode, wbc->wb_id);
} }
EXPORT_SYMBOL_GPL(wbc_attach_and_unlock_inode);
/**
* wbc_attach_fdatawrite_inode - associate wbc and inode for fdatawrite
* @wbc: writeback_control of interest
* @inode: target inode
*
* This function is to be used by __filemap_fdatawrite_range(), which is an
* alternative entry point into writeback code, and first ensures @inode is
* associated with a bdi_writeback and attaches it to @wbc.
*/
void wbc_attach_fdatawrite_inode(struct writeback_control *wbc,
struct inode *inode)
{
spin_lock(&inode->i_lock);
inode_attach_wb(inode, NULL);
wbc_attach_and_unlock_inode(wbc, inode);
}
EXPORT_SYMBOL_GPL(wbc_attach_fdatawrite_inode);
/** /**
* wbc_detach_inode - disassociate wbc from inode and perform foreign detection * wbc_detach_inode - disassociate wbc from inode and perform foreign detection
@ -1228,6 +1244,13 @@ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi,
} }
} }
static inline void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
struct inode *inode)
__releases(&inode->i_lock)
{
spin_unlock(&inode->i_lock);
}
#endif /* CONFIG_CGROUP_WRITEBACK */ #endif /* CONFIG_CGROUP_WRITEBACK */
/* /*

28
include/linux/writeback.h
View file

@ -213,9 +213,6 @@ static inline void wait_on_inode(struct inode *inode)
#include <linux/bio.h> #include <linux/bio.h>
void __inode_attach_wb(struct inode *inode, struct folio *folio); void __inode_attach_wb(struct inode *inode, struct folio *folio);
void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
struct inode *inode)
__releases(&inode->i_lock);
void wbc_detach_inode(struct writeback_control *wbc); void wbc_detach_inode(struct writeback_control *wbc);
void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page, void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
size_t bytes); size_t bytes);
@ -254,22 +251,8 @@ static inline void inode_detach_wb(struct inode *inode)
} }
} }
/** void wbc_attach_fdatawrite_inode(struct writeback_control *wbc,
* wbc_attach_fdatawrite_inode - associate wbc and inode for fdatawrite struct inode *inode);
* @wbc: writeback_control of interest
* @inode: target inode
*
* This function is to be used by __filemap_fdatawrite_range(), which is an
* alternative entry point into writeback code, and first ensures @inode is
* associated with a bdi_writeback and attaches it to @wbc.
*/
static inline void wbc_attach_fdatawrite_inode(struct writeback_control *wbc,
struct inode *inode)
{
spin_lock(&inode->i_lock);
inode_attach_wb(inode, NULL);
wbc_attach_and_unlock_inode(wbc, inode);
}
/** /**
* wbc_init_bio - writeback specific initializtion of bio * wbc_init_bio - writeback specific initializtion of bio
@ -303,13 +286,6 @@ static inline void inode_detach_wb(struct inode *inode)
{ {
} }
static inline void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
struct inode *inode)
__releases(&inode->i_lock)
{
spin_unlock(&inode->i_lock);
}
static inline void wbc_attach_fdatawrite_inode(struct writeback_control *wbc, static inline void wbc_attach_fdatawrite_inode(struct writeback_control *wbc,
struct inode *inode) struct inode *inode)
{ {