Btrfs: don't use highmem for free space cache pages

In order to create the free space cache concurrently with FS modifications,
we need to take a few block group locks.

The cache code also does kmap, which would schedule with the locks held.
Instead of going through kmap_atomic, lets just use lowmem for the cache
pages.

Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 6886ae0..83532a2 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -85,7 +85,8 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
        }
 
        mapping_set_gfp_mask(inode->i_mapping,
-                       mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
+                       mapping_gfp_mask(inode->i_mapping) &
+                       ~(GFP_NOFS & ~__GFP_HIGHMEM));
 
        return inode;
 }
@@ -310,7 +311,6 @@ static void io_ctl_free(struct btrfs_io_ctl *io_ctl)
 static void io_ctl_unmap_page(struct btrfs_io_ctl *io_ctl)
 {
        if (io_ctl->cur) {
-               kunmap(io_ctl->page);
                io_ctl->cur = NULL;
                io_ctl->orig = NULL;
        }
@@ -320,7 +320,7 @@ static void io_ctl_map_page(struct btrfs_io_ctl *io_ctl, int clear)
 {
        ASSERT(io_ctl->index < io_ctl->num_pages);
        io_ctl->page = io_ctl->pages[io_ctl->index++];
-       io_ctl->cur = kmap(io_ctl->page);
+       io_ctl->cur = page_address(io_ctl->page);
        io_ctl->orig = io_ctl->cur;
        io_ctl->size = PAGE_CACHE_SIZE;
        if (clear)
@@ -446,10 +446,9 @@ static void io_ctl_set_crc(struct btrfs_io_ctl *io_ctl, int index)
                              PAGE_CACHE_SIZE - offset);
        btrfs_csum_final(crc, (char *)&crc);
        io_ctl_unmap_page(io_ctl);
-       tmp = kmap(io_ctl->pages[0]);
+       tmp = page_address(io_ctl->pages[0]);
        tmp += index;
        *tmp = crc;
-       kunmap(io_ctl->pages[0]);
 }
 
 static int io_ctl_check_crc(struct btrfs_io_ctl *io_ctl, int index)
@@ -466,10 +465,9 @@ static int io_ctl_check_crc(struct btrfs_io_ctl *io_ctl, int index)
        if (index == 0)
                offset = sizeof(u32) * io_ctl->num_pages;
 
-       tmp = kmap(io_ctl->pages[0]);
+       tmp = page_address(io_ctl->pages[0]);
        tmp += index;
        val = *tmp;
-       kunmap(io_ctl->pages[0]);
 
        io_ctl_map_page(io_ctl, 0);
        crc = btrfs_csum_data(io_ctl->orig + offset, crc,