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mm/truncate: add folio_unmap_invalidate() helper

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Add a folio_unmap_invalidate() helper, which unmaps and invalidates a
given folio.  The caller must already have locked the folio.  Embed the
old invalidate_complete_folio2() helper in there as well, as nobody else
calls it.

Use this new helper in invalidate_inode_pages2_range(), rather than
duplicate the code there.

In preparation for using this elsewhere as well, have it take a gfp_t mask
rather than assume GFP_KERNEL is the right choice.  This bubbles back to
invalidate_complete_folio2() as well.

Link: https://lkml.kernel.org/r/20241220154831.1086649-7-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Cc: Brian Foster <bfoster@redhat.com>
Cc: Chris Mason <clm@meta.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jens Axboe 2024-12-20 08:47:44 -07:00 • committed by Andrew Morton
parent 77d075221a
commit 4a9e23159f
2 changed files with 30 additions and 25 deletions
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2
mm/internal.h
View file

@ -392,6 +392,8 @@ void unmap_page_range(struct mmu_gather *tlb,
struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
struct zap_details *details);
int folio_unmap_invalidate(struct address_space *mapping, struct folio *folio,
gfp_t gfp);
void page_cache_ra_order(struct readahead_control *, struct file_ra_state *,
unsigned int order);

53
mm/truncate.c
View file

@ -525,6 +525,15 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
}
EXPORT_SYMBOL(invalidate_mapping_pages);
static int folio_launder(struct address_space *mapping, struct folio *folio)
{
if (!folio_test_dirty(folio))
return 0;
if (folio->mapping != mapping || mapping->a_ops->launder_folio == NULL)
return 0;
return mapping->a_ops->launder_folio(folio);
}
/*
* This is like mapping_evict_folio(), except it ignores the folio's
* refcount. We do this because invalidate_inode_pages2() needs stronger
@ -532,14 +541,26 @@ EXPORT_SYMBOL(invalidate_mapping_pages);
* shrink_folio_list() has a temp ref on them, or because they're transiently
* sitting in the folio_add_lru() caches.
*/
static int invalidate_complete_folio2(struct address_space *mapping,
struct folio *folio)
int folio_unmap_invalidate(struct address_space *mapping, struct folio *folio,
gfp_t gfp)
{
if (folio->mapping != mapping)
return 0;
int ret;
if (!filemap_release_folio(folio, GFP_KERNEL))
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
if (folio_test_dirty(folio))
return 0;
if (folio_mapped(folio))
unmap_mapping_folio(folio);
BUG_ON(folio_mapped(folio));
ret = folio_launder(mapping, folio);
if (ret)
return ret;
if (folio->mapping != mapping)
return -EBUSY;
if (!filemap_release_folio(folio, gfp))
return -EBUSY;
spin_lock(&mapping->host->i_lock);
xa_lock_irq(&mapping->i_pages);
@ -558,16 +579,7 @@ static int invalidate_complete_folio2(struct address_space *mapping,
failed:
xa_unlock_irq(&mapping->i_pages);
spin_unlock(&mapping->host->i_lock);
return 0;
}
static int folio_launder(struct address_space *mapping, struct folio *folio)
{
if (!folio_test_dirty(folio))
return 0;
if (folio->mapping != mapping || mapping->a_ops->launder_folio == NULL)
return 0;
return mapping->a_ops->launder_folio(folio);
return -EBUSY;
}
/**
@ -631,16 +643,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
}
VM_BUG_ON_FOLIO(!folio_contains(folio, indices[i]), folio);
folio_wait_writeback(folio);
if (folio_mapped(folio))
unmap_mapping_folio(folio);
BUG_ON(folio_mapped(folio));
ret2 = folio_launder(mapping, folio);
if (ret2 == 0) {
if (!invalidate_complete_folio2(mapping, folio))
ret2 = -EBUSY;
}
ret2 = folio_unmap_invalidate(mapping, folio, GFP_KERNEL);
if (ret2 < 0)
ret = ret2;
folio_unlock(folio);