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ceph: switch back to testing for NULL folio->private in ceph_dirty_folio

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Willy requested that we change this back to warning on folio->private
being non-NULl. He's trying to kill off the PG_private flag, and so we'd
like to catch where it's non-NULL.

Add a VM_WARN_ON_FOLIO (since it doesn't exist yet) and change over to
using that instead of VM_BUG_ON_FOLIO along with testing the ->private
pointer.

[ xiubli: define VM_WARN_ON_FOLIO macro in case DEBUG_VM is disabled
  reported by kernel test robot <lkp@intel.com> ]

Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2022-06-10 11:40:13 -04:00 committed by Ilya Dryomov
parent 7467b04418
commit 020bc44a9f
2 changed files with 11 additions and 1 deletions
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2
fs/ceph/addr.c
View File

@ -122,7 +122,7 @@ static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
* Reference snap context in folio->private. Also set
* PagePrivate so that we get invalidate_folio callback.
*/
VM_BUG_ON_FOLIO(folio_test_private(folio), folio);
VM_WARN_ON_FOLIO(folio->private, folio);
folio_attach_private(folio, snapc);
return ceph_fscache_dirty_folio(mapping, folio);

10
include/linux/mmdebug.h
View File

@ -54,6 +54,15 @@ void dump_mm(const struct mm_struct *mm);
} \
unlikely(__ret_warn_once); \
})
#define VM_WARN_ON_FOLIO(cond, folio) ({ \
int __ret_warn = !!(cond); \
\
if (unlikely(__ret_warn)) { \
dump_page(&folio->page, "VM_WARN_ON_FOLIO(" __stringify(cond)")");\
WARN_ON(1); \
} \
unlikely(__ret_warn); \
})
#define VM_WARN_ON_ONCE_FOLIO(cond, folio) ({ \
static bool __section(".data.once") __warned; \
int __ret_warn_once = !!(cond); \
@ -79,6 +88,7 @@ void dump_mm(const struct mm_struct *mm);
#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_FOLIO(cond, folio) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE_FOLIO(cond, folio) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)