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mm: Convert page-writeback to XArray

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Includes moving mapping_tagged() to fs.h as a static inline, and
changing it to return bool.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2017-11-22 11:41:23 -05:00
parent 8fa8e538e4
commit ff9c745b81
2 changed files with 37 additions and 54 deletions
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19
include/linux/fs.h
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@ -483,15 +483,18 @@ struct block_device {
struct mutex bd_fsfreeze_mutex;
} __randomize_layout;
/*
* Radix-tree tags, for tagging dirty and writeback pages within the pagecache
* radix trees
*/
#define PAGECACHE_TAG_DIRTY 0
#define PAGECACHE_TAG_WRITEBACK 1
#define PAGECACHE_TAG_TOWRITE 2
/* XArray tags, for tagging dirty and writeback pages in the pagecache. */
#define PAGECACHE_TAG_DIRTY XA_MARK_0
#define PAGECACHE_TAG_WRITEBACK XA_MARK_1
#define PAGECACHE_TAG_TOWRITE XA_MARK_2
int mapping_tagged(struct address_space *mapping, int tag);
/*
* Returns true if any of the pages in the mapping are marked with the tag.
*/
static inline bool mapping_tagged(struct address_space *mapping, xa_mark_t tag)
{
return xa_marked(&mapping->i_pages, tag);
}
static inline void i_mmap_lock_write(struct address_space *mapping)
{