[PATCH RFC PKS/PMEM 32/58] fs/hostfs: Utilize new kmap_thread()

[ira.weiny@xxxxxxxxx]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

The kmap() calls in this FS are localized to a single thread.  To avoid
the over head of global PKRS updates use the new kmap_thread() call.

Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 fs/hostfs/hostfs_kern.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index c070c0d8e3e9..608efd0f83cb 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -409,7 +409,7 @@ static int hostfs_writepage(struct page *page, struct 
writeback_control *wbc)
        if (page->index >= end_index)
                count = inode->i_size & (PAGE_SIZE-1);
 
-       buffer = kmap(page);
+       buffer = kmap_thread(page);
 
        err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
        if (err != count) {
@@ -425,7 +425,7 @@ static int hostfs_writepage(struct page *page, struct 
writeback_control *wbc)
        err = 0;
 
  out:
-       kunmap(page);
+       kunmap_thread(page);
 
        unlock_page(page);
        return err;
@@ -437,7 +437,7 @@ static int hostfs_readpage(struct file *file, struct page 
*page)
        loff_t start = page_offset(page);
        int bytes_read, ret = 0;
 
-       buffer = kmap(page);
+       buffer = kmap_thread(page);
        bytes_read = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
                        PAGE_SIZE);
        if (bytes_read < 0) {
@@ -454,7 +454,7 @@ static int hostfs_readpage(struct file *file, struct page 
*page)
 
  out:
        flush_dcache_page(page);
-       kunmap(page);
+       kunmap_thread(page);
        unlock_page(page);
        return ret;
 }
@@ -480,9 +480,9 @@ static int hostfs_write_end(struct file *file, struct 
address_space *mapping,
        unsigned from = pos & (PAGE_SIZE - 1);
        int err;
 
-       buffer = kmap(page);
+       buffer = kmap_thread(page);
        err = write_file(FILE_HOSTFS_I(file)->fd, &pos, buffer + from, copied);
-       kunmap(page);
+       kunmap_thread(page);
 
        if (!PageUptodate(page) && err == PAGE_SIZE)
                SetPageUptodate(page);
-- 
2.28.0.rc0.12.gb6a658bd00c9