basic modification from way back

[powerpc.git] / fs / bio.c

diff --git a/fs/bio.c b/fs/bio.c
index d91cfbf..093345f 100644 (file)
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -28,9 +28,9 @@
 #include <linux/blktrace_api.h>
 #include <scsi/sg.h>           /* for struct sg_iovec */
 
-#define BIO_POOL_SIZE 256
+#define BIO_POOL_SIZE 2
 
-static kmem_cache_t *bio_slab __read_mostly;
+static struct kmem_cache *bio_slab __read_mostly;
 
 #define BIOVEC_NR_POOLS 6
 
@@ -38,13 +38,13 @@ static kmem_cache_t *bio_slab __read_mostly;
  * a small number of entries is fine, not going to be performance critical.
  * basically we just need to survive
  */
-#define BIO_SPLIT_ENTRIES 8    
+#define BIO_SPLIT_ENTRIES 2
 mempool_t *bio_split_pool __read_mostly;
 
 struct biovec_slab {
        int nr_vecs;
        char *name; 
-       kmem_cache_t *slab;
+       struct kmem_cache *slab;
 };
 
 /*
@@ -560,10 +560,8 @@ struct bio *bio_copy_user(request_queue_t *q, unsigned long uaddr,
                        break;
                }
 
-               if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes) {
-                       ret = -EINVAL;
+               if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes)
                        break;
-               }
 
                len -= bytes;
        }
@@ -750,7 +748,6 @@ struct bio *bio_map_user_iov(request_queue_t *q, struct block_device *bdev,
                             int write_to_vm)
 {
        struct bio *bio;
-       int len = 0, i;
 
        bio = __bio_map_user_iov(q, bdev, iov, iov_count, write_to_vm);
 
@@ -765,18 +762,7 @@ struct bio *bio_map_user_iov(request_queue_t *q, struct block_device *bdev,
         */
        bio_get(bio);
 
-       for (i = 0; i < iov_count; i++)
-               len += iov[i].iov_len;
-
-       if (bio->bi_size == len)
-               return bio;
-
-       /*
-        * don't support partial mappings
-        */
-       bio_endio(bio, bio->bi_size, 0);
-       bio_unmap_user(bio);
-       return ERR_PTR(-EINVAL);
+       return bio;
 }
 
 static void __bio_unmap_user(struct bio *bio)
@@ -930,7 +916,7 @@ void bio_set_pages_dirty(struct bio *bio)
        }
 }
 
-static void bio_release_pages(struct bio *bio)
+void bio_release_pages(struct bio *bio)
 {
        struct bio_vec *bvec = bio->bi_io_vec;
        int i;
@@ -954,16 +940,16 @@ static void bio_release_pages(struct bio *bio)
  * run one bio_put() against the BIO.
  */
 
-static void bio_dirty_fn(void *data);
+static void bio_dirty_fn(struct work_struct *work);
 
-static DECLARE_WORK(bio_dirty_work, bio_dirty_fn, NULL);
+static DECLARE_WORK(bio_dirty_work, bio_dirty_fn);
 static DEFINE_SPINLOCK(bio_dirty_lock);
 static struct bio *bio_dirty_list;
 
 /*
  * This runs in process context
  */
-static void bio_dirty_fn(void *data)
+static void bio_dirty_fn(struct work_struct *work)
 {
        unsigned long flags;
        struct bio *bio;
@@ -1134,7 +1120,7 @@ struct bio_pair *bio_split(struct bio *bi, mempool_t *pool, int first_sectors)
  * create memory pools for biovec's in a bio_set.
  * use the global biovec slabs created for general use.
  */
-static int biovec_create_pools(struct bio_set *bs, int pool_entries, int scale)
+static int biovec_create_pools(struct bio_set *bs, int pool_entries)
 {
        int i;
 
@@ -1142,9 +1128,6 @@ static int biovec_create_pools(struct bio_set *bs, int pool_entries, int scale)
                struct biovec_slab *bp = bvec_slabs + i;
                mempool_t **bvp = bs->bvec_pools + i;
 
-               if (pool_entries > 1 && i >= scale)
-                       pool_entries >>= 1;
-
                *bvp = mempool_create_slab_pool(pool_entries, bp->slab);
                if (!*bvp)
                        return -ENOMEM;
@@ -1175,7 +1158,7 @@ void bioset_free(struct bio_set *bs)
        kfree(bs);
 }
 
-struct bio_set *bioset_create(int bio_pool_size, int bvec_pool_size, int scale)
+struct bio_set *bioset_create(int bio_pool_size, int bvec_pool_size)
 {
        struct bio_set *bs = kzalloc(sizeof(*bs), GFP_KERNEL);
 
@@ -1186,7 +1169,7 @@ struct bio_set *bioset_create(int bio_pool_size, int bvec_pool_size, int scale)
        if (!bs->bio_pool)
                goto bad;
 
-       if (!biovec_create_pools(bs, bvec_pool_size, scale))
+       if (!biovec_create_pools(bs, bvec_pool_size))
                return bs;
 
 bad:
@@ -1210,38 +1193,11 @@ static void __init biovec_init_slabs(void)
 
 static int __init init_bio(void)
 {
-       int megabytes, bvec_pool_entries;
-       int scale = BIOVEC_NR_POOLS;
-
-       bio_slab = kmem_cache_create("bio", sizeof(struct bio), 0,
-                               SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+       bio_slab = KMEM_CACHE(bio, SLAB_HWCACHE_ALIGN|SLAB_PANIC);
 
        biovec_init_slabs();
 
-       megabytes = nr_free_pages() >> (20 - PAGE_SHIFT);
-
-       /*
-        * find out where to start scaling
-        */
-       if (megabytes <= 16)
-               scale = 0;
-       else if (megabytes <= 32)
-               scale = 1;
-       else if (megabytes <= 64)
-               scale = 2;
-       else if (megabytes <= 96)
-               scale = 3;
-       else if (megabytes <= 128)
-               scale = 4;
-
-       /*
-        * Limit number of entries reserved -- mempools are only used when
-        * the system is completely unable to allocate memory, so we only
-        * need enough to make progress.
-        */
-       bvec_pool_entries = 1 + scale;
-
-       fs_bio_set = bioset_create(BIO_POOL_SIZE, bvec_pool_entries, scale);
+       fs_bio_set = bioset_create(BIO_POOL_SIZE, 2);
        if (!fs_bio_set)
                panic("bio: can't allocate bios\n");