writeback: fix time ordering of the per superblock dirty inode lists: memory-backed...

[safe/jmp/linux-2.6] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index da5f051..993f78c 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -172,7 +172,7 @@ blkdev_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 }
 
 #if 0
-static int blk_end_aio(struct bio *bio, unsigned int bytes_done, int error)
+static void blk_end_aio(struct bio *bio, int error)
 {
        struct kiocb *iocb = bio->bi_private;
        atomic_t *bio_count = &iocb->ki_bio_count;
@@ -378,14 +378,26 @@ static int blkdev_readpage(struct file * file, struct page * page)
        return block_read_full_page(page, blkdev_get_block);
 }
 
-static int blkdev_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
+static int blkdev_write_begin(struct file *file, struct address_space *mapping,
+                       loff_t pos, unsigned len, unsigned flags,
+                       struct page **pagep, void **fsdata)
 {
-       return block_prepare_write(page, from, to, blkdev_get_block);
+       *pagep = NULL;
+       return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+                               blkdev_get_block);
 }
 
-static int blkdev_commit_write(struct file *file, struct page *page, unsigned from, unsigned to)
+static int blkdev_write_end(struct file *file, struct address_space *mapping,
+                       loff_t pos, unsigned len, unsigned copied,
+                       struct page *page, void *fsdata)
 {
-       return block_commit_write(page, from, to);
+       int ret;
+       ret = block_write_end(file, mapping, pos, len, copied, page, fsdata);
+
+       unlock_page(page);
+       page_cache_release(page);
+
+       return ret;
 }
 
 /*
@@ -453,7 +465,7 @@ static void bdev_destroy_inode(struct inode *inode)
        kmem_cache_free(bdev_cachep, bdi);
 }
 
-static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
+static void init_once(struct kmem_cache * cachep, void *foo)
 {
        struct bdev_inode *ei = (struct bdev_inode *) foo;
        struct block_device *bdev = &ei->bdev;
@@ -517,7 +529,7 @@ void __init bdev_cache_init(void)
        bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode),
                        0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
                                SLAB_MEM_SPREAD|SLAB_PANIC),
-                       init_once, NULL);
+                       init_once);
        err = register_filesystem(&bd_type);
        if (err)
                panic("Cannot register bdev pseudo-fs");
@@ -872,7 +884,7 @@ static struct bd_holder *find_bd_holder(struct block_device *bdev,
  */
 static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo)
 {
-       int ret;
+       int err;
 
        if (!bo)
                return -EINVAL;
@@ -880,15 +892,18 @@ static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo)
        if (!bd_holder_grab_dirs(bdev, bo))
                return -EBUSY;
 
-       ret = add_symlink(bo->sdir, bo->sdev);
-       if (ret == 0) {
-               ret = add_symlink(bo->hdir, bo->hdev);
-               if (ret)
-                       del_symlink(bo->sdir, bo->sdev);
+       err = add_symlink(bo->sdir, bo->sdev);
+       if (err)
+               return err;
+
+       err = add_symlink(bo->hdir, bo->hdev);
+       if (err) {
+               del_symlink(bo->sdir, bo->sdev);
+               return err;
        }
-       if (ret == 0)
-               list_add_tail(&bo->list, &bdev->bd_holder_list);
-       return ret;
+
+       list_add_tail(&bo->list, &bdev->bd_holder_list);
+       return 0;
 }
 
 /**
@@ -946,7 +961,7 @@ static struct bd_holder *del_bd_holder(struct block_device *bdev,
 static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
                                struct kobject *kobj)
 {
-       int res;
+       int err;
        struct bd_holder *bo, *found;
 
        if (!kobj)
@@ -957,21 +972,24 @@ static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
                return -ENOMEM;
 
        mutex_lock(&bdev->bd_mutex);
-       res = bd_claim(bdev, holder);
-       if (res == 0) {
-               found = find_bd_holder(bdev, bo);
-               if (found == NULL) {
-                       res = add_bd_holder(bdev, bo);
-                       if (res)
-                               bd_release(bdev);
-               }
-       }
 
-       if (res || found)
-               free_bd_holder(bo);
-       mutex_unlock(&bdev->bd_mutex);
+       err = bd_claim(bdev, holder);
+       if (err)
+               goto fail;
 
-       return res;
+       found = find_bd_holder(bdev, bo);
+       if (found)
+               goto fail;
+
+       err = add_bd_holder(bdev, bo);
+       if (err)
+               bd_release(bdev);
+       else
+               bo = NULL;
+fail:
+       mutex_unlock(&bdev->bd_mutex);
+       free_bd_holder(bo);
+       return err;
 }
 
 /**
@@ -985,15 +1003,12 @@ static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
 static void bd_release_from_kobject(struct block_device *bdev,
                                        struct kobject *kobj)
 {
-       struct bd_holder *bo;
-
        if (!kobj)
                return;
 
        mutex_lock(&bdev->bd_mutex);
        bd_release(bdev);
-       if ((bo = del_bd_holder(bdev, kobj)))
-               free_bd_holder(bo);
+       free_bd_holder(del_bd_holder(bdev, kobj));
        mutex_unlock(&bdev->bd_mutex);
 }
 
@@ -1324,8 +1339,8 @@ const struct address_space_operations def_blk_aops = {
        .readpage       = blkdev_readpage,
        .writepage      = blkdev_writepage,
        .sync_page      = block_sync_page,
-       .prepare_write  = blkdev_prepare_write,
-       .commit_write   = blkdev_commit_write,
+       .write_begin    = blkdev_write_begin,
+       .write_end      = blkdev_write_end,
        .writepages     = generic_writepages,
        .direct_IO      = blkdev_direct_IO,
 };