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mm: migrate: provide buffer_migrate_page_norefs()

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Provide a variant of buffer_migrate_page() that also checks whether there
are no unexpected references to buffer heads.  This function will then be
safe to use for block device pages.

[akpm@linux-foundation.org: remove EXPORT_SYMBOL(buffer_migrate_page_norefs)]
Link: http://lkml.kernel.org/r/20181211172143.7358-5-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2018-12-28 00:39:12 -08:00 • committed by Linus Torvalds
parent 84ade7c15c
commit 89cb0888ca
2 changed files with 57 additions and 7 deletions
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4
include/linux/fs.h
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@ -3269,8 +3269,12 @@ extern int generic_check_addressable(unsigned, u64);
extern int buffer_migrate_page(struct address_space *,
struct page *, struct page *,
enum migrate_mode);
extern int buffer_migrate_page_norefs(struct address_space *,
struct page *, struct page *,
enum migrate_mode);
#else
#define buffer_migrate_page NULL
#define buffer_migrate_page_norefs NULL
#endif
extern int setattr_prepare(struct dentry *, struct iattr *);