lkml.org 
[lkml]   [2020]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 5.4 288/344] bcache: rework error unwinding in register_bcache
    Date
    From: Christoph Hellwig <hch@lst.de>

    [ Upstream commit 50246693f81fe887f4db78bf7089051d7f1894cc ]

    Split the successful and error return path, and use one goto label for each
    resource to unwind. This also fixes some small errors like leaking the
    module reference count in the reboot case (which seems entirely harmless)
    or printing the wrong warning messages for early failures.

    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Coly Li <colyli@suse.de>
    Signed-off-by: Jens Axboe <axboe@kernel.dk>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/md/bcache/super.c | 75 +++++++++++++++++++++++----------------
    1 file changed, 45 insertions(+), 30 deletions(-)

    diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
    index b86cf72033401..86f7e09d31516 100644
    --- a/drivers/md/bcache/super.c
    +++ b/drivers/md/bcache/super.c
    @@ -2372,29 +2372,33 @@ static bool bch_is_open(struct block_device *bdev)
    static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
    const char *buffer, size_t size)
    {
    - ssize_t ret = -EINVAL;
    - const char *err = "cannot allocate memory";
    - char *path = NULL;
    - struct cache_sb *sb = NULL;
    + const char *err;
    + char *path;
    + struct cache_sb *sb;
    struct block_device *bdev = NULL;
    - struct page *sb_page = NULL;
    + struct page *sb_page;
    + ssize_t ret;

    + ret = -EBUSY;
    if (!try_module_get(THIS_MODULE))
    - return -EBUSY;
    + goto out;

    /* For latest state of bcache_is_reboot */
    smp_mb();
    if (bcache_is_reboot)
    - return -EBUSY;
    + goto out_module_put;

    + ret = -ENOMEM;
    + err = "cannot allocate memory";
    path = kstrndup(buffer, size, GFP_KERNEL);
    if (!path)
    - goto err;
    + goto out_module_put;

    sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL);
    if (!sb)
    - goto err;
    + goto out_free_path;

    + ret = -EINVAL;
    err = "failed to open device";
    bdev = blkdev_get_by_path(strim(path),
    FMODE_READ|FMODE_WRITE|FMODE_EXCL,
    @@ -2411,57 +2415,68 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
    if (!IS_ERR(bdev))
    bdput(bdev);
    if (attr == &ksysfs_register_quiet)
    - goto quiet_out;
    + goto done;
    }
    - goto err;
    + goto out_free_sb;
    }

    err = "failed to set blocksize";
    if (set_blocksize(bdev, 4096))
    - goto err_close;
    + goto out_blkdev_put;

    err = read_super(sb, bdev, &sb_page);
    if (err)
    - goto err_close;
    + goto out_blkdev_put;

    err = "failed to register device";
    if (SB_IS_BDEV(sb)) {
    struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL);

    if (!dc)
    - goto err_close;
    + goto out_put_sb_page;

    mutex_lock(&bch_register_lock);
    ret = register_bdev(sb, sb_page, bdev, dc);
    mutex_unlock(&bch_register_lock);
    /* blkdev_put() will be called in cached_dev_free() */
    - if (ret < 0)
    - goto err;
    + if (ret < 0) {
    + bdev = NULL;
    + goto out_put_sb_page;
    + }
    } else {
    struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);

    if (!ca)
    - goto err_close;
    + goto out_put_sb_page;

    /* blkdev_put() will be called in bch_cache_release() */
    - if (register_cache(sb, sb_page, bdev, ca) != 0)
    - goto err;
    + if (register_cache(sb, sb_page, bdev, ca) != 0) {
    + bdev = NULL;
    + goto out_put_sb_page;
    + }
    }
    -quiet_out:
    - ret = size;
    -out:
    - if (sb_page)
    - put_page(sb_page);
    +
    + put_page(sb_page);
    +done:
    kfree(sb);
    kfree(path);
    module_put(THIS_MODULE);
    - return ret;
    -
    -err_close:
    - blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
    -err:
    + return size;
    +
    +out_put_sb_page:
    + put_page(sb_page);
    +out_blkdev_put:
    + if (bdev)
    + blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
    +out_free_sb:
    + kfree(sb);
    +out_free_path:
    + kfree(path);
    +out_module_put:
    + module_put(THIS_MODULE);
    +out:
    pr_info("error %s: %s", path, err);
    - goto out;
    + return ret;
    }


    --
    2.20.1


    \
     
     \ /
      Last update: 2020-02-21 09:32    [W:4.041 / U:0.348 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site