dm io: flush cpu cache with vmapped io

[pandora-kernel.git] / drivers / md / dm-io.c

diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 2067288..ad2eba4 100644 (file)
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -38,6 +38,8 @@ struct io {
        struct dm_io_client *client;
        io_notify_fn callback;
        void *context;
+       void *vma_invalidate_address;
+       unsigned long vma_invalidate_size;
 } __attribute__((aligned(DM_IO_MAX_REGIONS)));
 
 static struct kmem_cache *_dm_io_cache;
@@ -116,6 +118,10 @@ static void dec_count(struct io *io, unsigned int region, int error)
                set_bit(region, &io->error_bits);
 
        if (atomic_dec_and_test(&io->count)) {
+               if (io->vma_invalidate_size)
+                       invalidate_kernel_vmap_range(io->vma_invalidate_address,
+                                                    io->vma_invalidate_size);
+
                if (io->sleeper)
                        wake_up_process(io->sleeper);
 
@@ -159,6 +165,9 @@ struct dpages {
 
        unsigned context_u;
        void *context_ptr;
+
+       void *vma_invalidate_address;
+       unsigned long vma_invalidate_size;
 };
 
 /*
@@ -377,6 +386,9 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
        io->sleeper = current;
        io->client = client;
 
+       io->vma_invalidate_address = dp->vma_invalidate_address;
+       io->vma_invalidate_size = dp->vma_invalidate_size;
+
        dispatch_io(rw, num_regions, where, dp, io, 1);
 
        while (1) {
@@ -415,13 +427,21 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
        io->callback = fn;
        io->context = context;
 
+       io->vma_invalidate_address = dp->vma_invalidate_address;
+       io->vma_invalidate_size = dp->vma_invalidate_size;
+
        dispatch_io(rw, num_regions, where, dp, io, 0);
        return 0;
 }
 
-static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
+static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
+                  unsigned long size)
 {
        /* Set up dpages based on memory type */
+
+       dp->vma_invalidate_address = NULL;
+       dp->vma_invalidate_size = 0;
+
        switch (io_req->mem.type) {
        case DM_IO_PAGE_LIST:
                list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);
@@ -432,6 +452,11 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
                break;
 
        case DM_IO_VMA:
+               flush_kernel_vmap_range(io_req->mem.ptr.vma, size);
+               if ((io_req->bi_rw & RW_MASK) == READ) {
+                       dp->vma_invalidate_address = io_req->mem.ptr.vma;
+                       dp->vma_invalidate_size = size;
+               }
                vm_dp_init(dp, io_req->mem.ptr.vma);
                break;
 
@@ -460,7 +485,7 @@ int dm_io(struct dm_io_request *io_req, unsigned num_regions,
        int r;
        struct dpages dp;
 
-       r = dp_init(io_req, &dp);
+       r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT);
        if (r)
                return r;