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iomap: turn iomap_want_unshare_iter into an inline function

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iomap_want_unshare_iter currently sits in fs/iomap/buffered-io.c, which
depends on CONFIG_BLOCK.  It is also in used in fs/dax.c whіch has no
such dependency.  Given that it is a trivial check turn it into an inline
in include/linux/iomap.h to fix the DAX && !BLOCK build.

Fixes: 6ef6a0e821 ("iomap: share iomap_unshare_iter predicate code with fsdax")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241015041350.118403-1-hch@lst.de
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-10-15 06:13:50 +02:00 committed by Christian Brauner
parent dad1b6c805
commit 6db388585e
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 19 additions and 18 deletions
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17
fs/iomap/buffered-io.c
View File

@ -1309,23 +1309,6 @@ void iomap_file_buffered_write_punch_delalloc(struct inode *inode,
}
EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc);
bool iomap_want_unshare_iter(const struct iomap_iter *iter)
{
/*
* Don't bother with blocks that are not shared to start with; or
* mappings that cannot be shared, such as inline data, delalloc
* reservations, holes or unwritten extents.
*
* Note that we use srcmap directly instead of iomap_iter_srcmap as
* unsharing requires providing a separate source map, and the presence
* of one is a good indicator that unsharing is needed, unlike
* IOMAP_F_SHARED which can be set for any data that goes into the COW
* fork for XFS.
*/
return (iter->iomap.flags & IOMAP_F_SHARED) &&
iter->srcmap.type == IOMAP_MAPPED;
}
static loff_t iomap_unshare_iter(struct iomap_iter *iter)
{
struct iomap *iomap = &iter->iomap;

20
include/linux/iomap.h
View File

@ -256,6 +256,25 @@ static inline const struct iomap *iomap_iter_srcmap(const struct iomap_iter *i)
return &i->iomap;
}
/*
* Check if the range needs to be unshared for a FALLOC_FL_UNSHARE_RANGE
* operation.
*
* Don't bother with blocks that are not shared to start with; or mappings that
* cannot be shared, such as inline data, delalloc reservations, holes or
* unwritten extents.
*
* Note that we use srcmap directly instead of iomap_iter_srcmap as unsharing
* requires providing a separate source map, and the presence of one is a good
* indicator that unsharing is needed, unlike IOMAP_F_SHARED which can be set
* for any data that goes into the COW fork for XFS.
*/
static inline bool iomap_want_unshare_iter(const struct iomap_iter *iter)
{
return (iter->iomap.flags & IOMAP_F_SHARED) &&
iter->srcmap.type == IOMAP_MAPPED;
}
ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
const struct iomap_ops *ops, void *private);
int iomap_read_folio(struct folio *folio, const struct iomap_ops *ops);
@ -267,7 +286,6 @@ void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len);
bool iomap_dirty_folio(struct address_space *mapping, struct folio *folio);
int iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
const struct iomap_ops *ops);
bool iomap_want_unshare_iter(const struct iomap_iter *iter);
int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
bool *did_zero, const struct iomap_ops *ops);
int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,