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dax: account DAX entries as nrpages

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Simplify mapping_needs_writeback() by accounting DAX entries as pages
instead of exceptional entries.

Link: https://lkml.kernel.org/r/20201026151849.24232-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Vishal Verma <vishal.l.verma@intel.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-05-04 18:32:51 -07:00 committed by Linus Torvalds
parent 46be67b424
commit 7f0e07fb02
2 changed files with 3 additions and 6 deletions
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6
fs/dax.c
View file

@ -525,7 +525,7 @@ static void *grab_mapping_entry(struct xa_state *xas,
dax_disassociate_entry(entry, mapping, false);
xas_store(xas, NULL); /* undo the PMD join */
dax_wake_entry(xas, entry, true);
mapping->nrexceptional--;
mapping->nrpages -= PG_PMD_NR;
entry = NULL;
xas_set(xas, index);
}
@ -541,7 +541,7 @@ static void *grab_mapping_entry(struct xa_state *xas,
dax_lock_entry(xas, entry);
if (xas_error(xas))
goto out_unlock;
mapping->nrexceptional++;
mapping->nrpages += 1UL << order;
}
out_unlock:
@ -661,7 +661,7 @@ static int __dax_invalidate_entry(struct address_space *mapping,
goto out;
dax_disassociate_entry(entry, mapping, trunc);
xas_store(&xas, NULL);
mapping->nrexceptional--;
mapping->nrpages -= 1UL << dax_entry_order(entry);
ret = 1;
out:
put_unlocked_entry(&xas, entry);

3
mm/filemap.c
View file

@ -618,9 +618,6 @@ EXPORT_SYMBOL(filemap_fdatawait_keep_errors);
/* Returns true if writeback might be needed or already in progress. */
static bool mapping_needs_writeback(struct address_space *mapping)
{
if (dax_mapping(mapping))
return mapping->nrexceptional;
return mapping->nrpages;
}