thermal: re-document thermal units
[linux-2.6.git] / fs / direct-io.c
index d9d0833..9e81add 100644 (file)
@@ -163,7 +163,7 @@ static int dio_refill_pages(struct dio *dio)
        up_read(&current->mm->mmap_sem);
 
        if (ret < 0 && dio->blocks_available && (dio->rw & WRITE)) {
-               struct page *page = ZERO_PAGE(dio->curr_user_address);
+               struct page *page = ZERO_PAGE(0);
                /*
                 * A memory fault, but the filesystem has some outstanding
                 * mapped blocks.  We need to use those blocks up to avoid
@@ -264,15 +264,12 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio);
 /*
  * Asynchronous IO callback. 
  */
-static int dio_bio_end_aio(struct bio *bio, unsigned int bytes_done, int error)
+static void dio_bio_end_aio(struct bio *bio, int error)
 {
        struct dio *dio = bio->bi_private;
        unsigned long remaining;
        unsigned long flags;
 
-       if (bio->bi_size)
-               return 1;
-
        /* cleanup the bio */
        dio_bio_complete(dio, bio);
 
@@ -287,8 +284,6 @@ static int dio_bio_end_aio(struct bio *bio, unsigned int bytes_done, int error)
                aio_complete(dio->iocb, ret, 0);
                kfree(dio);
        }
-
-       return 0;
 }
 
 /*
@@ -298,21 +293,17 @@ static int dio_bio_end_aio(struct bio *bio, unsigned int bytes_done, int error)
  * During I/O bi_private points at the dio.  After I/O, bi_private is used to
  * implement a singly-linked list of completed BIOs, at dio->bio_list.
  */
-static int dio_bio_end_io(struct bio *bio, unsigned int bytes_done, int error)
+static void dio_bio_end_io(struct bio *bio, int error)
 {
        struct dio *dio = bio->bi_private;
        unsigned long flags;
 
-       if (bio->bi_size)
-               return 1;
-
        spin_lock_irqsave(&dio->bio_lock, flags);
        bio->bi_private = dio->bio_list;
        dio->bio_list = bio;
        if (--dio->refcount == 1 && dio->waiter)
                wake_up_process(dio->waiter);
        spin_unlock_irqrestore(&dio->bio_lock, flags);
-       return 0;
 }
 
 static int
@@ -439,7 +430,7 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio)
  * Wait on and process all in-flight BIOs.  This must only be called once
  * all bios have been issued so that the refcount can only decrease.
  * This just waits for all bios to make it through dio_bio_complete.  IO
- * errors are propogated through dio->io_error and should be propogated via
+ * errors are propagated through dio->io_error and should be propagated via
  * dio_complete().
  */
 static void dio_await_completion(struct dio *dio)
@@ -772,7 +763,7 @@ static void dio_zero_block(struct dio *dio, int end)
 
        this_chunk_bytes = this_chunk_blocks << dio->blkbits;
 
-       page = ZERO_PAGE(dio->curr_user_address);
+       page = ZERO_PAGE(0);
        if (submit_page_section(dio, page, 0, this_chunk_bytes, 
                                dio->next_block_for_io))
                return;
@@ -867,7 +858,6 @@ static int do_direct_IO(struct dio *dio)
 do_holes:
                        /* Handle holes */
                        if (!buffer_mapped(map_bh)) {
-                               char *kaddr;
                                loff_t i_size_aligned;
 
                                /* AKPM: eargh, -ENOTBLK is a hack */
@@ -888,11 +878,8 @@ do_holes:
                                        page_cache_release(page);
                                        goto out;
                                }
-                               kaddr = kmap_atomic(page, KM_USER0);
-                               memset(kaddr + (block_in_page << blkbits),
-                                               0, 1 << blkbits);
-                               flush_dcache_page(page);
-                               kunmap_atomic(kaddr, KM_USER0);
+                               zero_user(page, block_in_page << blkbits,
+                                               1 << blkbits);
                                dio->block_in_file++;
                                block_in_page++;
                                goto next_block;
@@ -962,35 +949,22 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
        ssize_t ret2;
        size_t bytes;
 
-       dio->bio = NULL;
        dio->inode = inode;
        dio->rw = rw;
        dio->blkbits = blkbits;
        dio->blkfactor = inode->i_blkbits - blkbits;
-       dio->start_zero_done = 0;
-       dio->size = 0;
        dio->block_in_file = offset >> blkbits;
-       dio->blocks_available = 0;
-       dio->cur_page = NULL;
 
-       dio->boundary = 0;
-       dio->reap_counter = 0;
        dio->get_block = get_block;
        dio->end_io = end_io;
-       dio->map_bh.b_private = NULL;
        dio->final_block_in_bio = -1;
        dio->next_block_for_io = -1;
 
-       dio->page_errors = 0;
-       dio->io_error = 0;
-       dio->result = 0;
        dio->iocb = iocb;
        dio->i_size = i_size_read(inode);
 
        spin_lock_init(&dio->bio_lock);
        dio->refcount = 1;
-       dio->bio_list = NULL;
-       dio->waiter = NULL;
 
        /*
         * In case of non-aligned buffers, we may need 2 more
@@ -998,8 +972,6 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
         */
        if (unlikely(dio->blkfactor))
                dio->pages_in_io = 2;
-       else
-               dio->pages_in_io = 0;
 
        for (seg = 0; seg < nr_segs; seg++) {
                user_addr = (unsigned long)iov[seg].iov_base;
@@ -1110,7 +1082,7 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
        spin_lock_irqsave(&dio->bio_lock, flags);
        ret2 = --dio->refcount;
        spin_unlock_irqrestore(&dio->bio_lock, flags);
-       BUG_ON(!dio->is_async && ret2 != 0);
+
        if (ret2 == 0) {
                ret = dio_complete(dio, offset, ret);
                kfree(dio);
@@ -1187,7 +1159,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
                }
        }
 
-       dio = kmalloc(sizeof(*dio), GFP_KERNEL);
+       dio = kzalloc(sizeof(*dio), GFP_KERNEL);
        retval = -ENOMEM;
        if (!dio)
                goto out;