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authorChristian Brauner <brauner@kernel.org>2024-01-23 14:26:49 +0100
committerChristian Brauner <brauner@kernel.org>2024-02-25 12:05:28 +0100
commitab838b3fd9a442a62f36ea7eeb93e77259f787ce (patch)
tree961c6004ba64d9575d47201d83d33ff1bc97b39a /block/bdev.c
parent321de651fa565dcf76c017b257bdf15ec7fff45d (diff)
block: remove bdev_handle completely
We just need to use the holder to indicate whether a block device open was exclusive or not. We did use to do that before but had to give that up once we switched to struct bdev_handle. Before struct bdev_handle we only stashed stuff in file->private_data if this was an exclusive open but after struct bdev_handle we always set file->private_data to a struct bdev_handle and so we had to use bdev_handle->mode or bdev_handle->holder. Now that we don't use struct bdev_handle anymore we can revert back to the old behavior. Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-32-adbd023e19cc@kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'block/bdev.c')
-rw-r--r--block/bdev.c47
1 files changed, 24 insertions, 23 deletions
diff --git a/block/bdev.c b/block/bdev.c
index efecc9b97e1e..140093c99bdc 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -717,6 +717,13 @@ int bdev_permission(dev_t dev, blk_mode_t mode, void *holder)
if (mode & BLK_OPEN_RESTRICT_WRITES && !holder)
return -EINVAL;
+ /*
+ * We're using error pointers to indicate to ->release() when we
+ * failed to open that block device. Also this doesn't make sense.
+ */
+ if (WARN_ON_ONCE(IS_ERR(holder)))
+ return -EINVAL;
+
return 0;
}
@@ -799,7 +806,7 @@ static void bdev_claim_write_access(struct block_device *bdev, blk_mode_t mode)
bdev->bd_writers++;
}
-static void bdev_yield_write_access(struct file *bdev_file, blk_mode_t mode)
+static void bdev_yield_write_access(struct file *bdev_file)
{
struct block_device *bdev;
@@ -808,7 +815,7 @@ static void bdev_yield_write_access(struct file *bdev_file, blk_mode_t mode)
bdev = file_bdev(bdev_file);
/* Yield exclusive or shared write access. */
- if (mode & BLK_OPEN_WRITE) {
+ if (bdev_file->f_mode & FMODE_WRITE) {
if (bdev_writes_blocked(bdev))
bdev_unblock_writes(bdev);
else
@@ -836,25 +843,18 @@ static void bdev_yield_write_access(struct file *bdev_file, blk_mode_t mode)
int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder,
const struct blk_holder_ops *hops, struct file *bdev_file)
{
- struct bdev_handle *handle;
bool unblock_events = true;
struct gendisk *disk = bdev->bd_disk;
int ret;
- handle = kmalloc(sizeof(struct bdev_handle), GFP_KERNEL);
- if (!handle)
- return -ENOMEM;
-
if (holder) {
mode |= BLK_OPEN_EXCL;
ret = bd_prepare_to_claim(bdev, holder, hops);
if (ret)
- goto free_handle;
+ return ret;
} else {
- if (WARN_ON_ONCE(mode & BLK_OPEN_EXCL)) {
- ret = -EIO;
- goto free_handle;
- }
+ if (WARN_ON_ONCE(mode & BLK_OPEN_EXCL))
+ return -EIO;
}
disk_block_events(disk);
@@ -895,8 +895,6 @@ int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder,
if (unblock_events)
disk_unblock_events(disk);
- handle->holder = holder;
- handle->mode = mode;
bdev_file->f_flags |= O_LARGEFILE;
bdev_file->f_mode |= FMODE_BUF_RASYNC | FMODE_CAN_ODIRECT;
@@ -904,7 +902,7 @@ int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder,
bdev_file->f_mode |= FMODE_NOWAIT;
bdev_file->f_mapping = bdev->bd_inode->i_mapping;
bdev_file->f_wb_err = filemap_sample_wb_err(bdev_file->f_mapping);
- bdev_file->private_data = handle;
+ bdev_file->private_data = holder;
return 0;
put_module:
@@ -914,8 +912,6 @@ abort_claiming:
bd_abort_claiming(bdev, holder);
mutex_unlock(&disk->open_mutex);
disk_unblock_events(disk);
-free_handle:
- kfree(handle);
return ret;
}
@@ -976,7 +972,8 @@ struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
ret = bdev_open(bdev, mode, holder, hops, bdev_file);
if (ret) {
- blkdev_put_no_open(bdev);
+ /* We failed to open the block device. Let ->release() know. */
+ bdev_file->private_data = ERR_PTR(ret);
fput(bdev_file);
return ERR_PTR(ret);
}
@@ -1011,9 +1008,13 @@ EXPORT_SYMBOL(bdev_file_open_by_path);
void bdev_release(struct file *bdev_file)
{
struct block_device *bdev = file_bdev(bdev_file);
- struct bdev_handle *handle = bdev_file->private_data;
+ void *holder = bdev_file->private_data;
struct gendisk *disk = bdev->bd_disk;
+ /* We failed to open that block device. */
+ if (IS_ERR(holder))
+ goto put_no_open;
+
/*
* Sync early if it looks like we're the last one. If someone else
* opens the block device between now and the decrement of bd_openers
@@ -1025,10 +1026,10 @@ void bdev_release(struct file *bdev_file)
sync_blockdev(bdev);
mutex_lock(&disk->open_mutex);
- bdev_yield_write_access(bdev_file, handle->mode);
+ bdev_yield_write_access(bdev_file);
- if (handle->holder)
- bd_end_claim(bdev, handle->holder);
+ if (holder)
+ bd_end_claim(bdev, holder);
/*
* Trigger event checking and tell drivers to flush MEDIA_CHANGE
@@ -1044,8 +1045,8 @@ void bdev_release(struct file *bdev_file)
mutex_unlock(&disk->open_mutex);
module_put(disk->fops->owner);
+put_no_open:
blkdev_put_no_open(bdev);
- kfree(handle);
}
/**