blkdev

函数名称：lkdev_get - open a block device*@bdev: block_device to open*@mode: FMODE_* mask*@holder: exclusive holder identifier* Open @bdev with @mode. If @mode includes %FMODE_EXCL, @bdev is* open with exclusive access. Specifying %FMODE_EXCL with %NULL

函数原型：int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)

返回类型：int

参数：

类型	参数	名称
struct block_device *	bdev
fmode_t	mode
void *	holder

1723

struct block_device * whole = NULL

1726

WARN_ON_ONCE((mode & File is opened with O_EXCL (only set for block devices) ) && !holder)

1728

如果mode按位与File is opened with O_EXCL (only set for block devices) 且holder则

1729

whole等于d_start_claiming - start claiming a block device*@bdev: block device of interest*@holder: holder trying to claim @bdev*@bdev is about to be opened exclusively

1730

如果是错误则

1731

bdput(bdev)

1732

返回:错误

1736

res等于d_mutex locking:* mutex_lock(part->bd_mutex)* mutex_lock_nested(whole->bd_mutex, 1)

1738

如果whole则

1739

disk等于bd_disk

1742

mutex_lock( & open/close mutex )

1743

如果非res则d_finish_claiming - finish claiming of a block device*@bdev: block device of interest*@whole: whole block device (returned from bd_start_claiming())*@holder: holder that has claimed @bdev* Finish exclusive open of a block device

1745

否则d_abort_claiming - abort claiming of a block device*@bdev: block device of interest*@whole: whole block device (returned from bd_start_claiming())*@holder: holder that has claimed @bdev* Abort claiming of a block device when the exclusive open failed

1754

如果非res且mode按位与le is open for writing 且非bd_write_holder且flags按位与GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE则

1756

bd_write_holder = true

1757

disk_block_events(disk)

1760

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

1761

bdput(whole)

1764

返回:res

**调用者**
名称	描述
register_disk
blkdev_get_by_path	lkdev_get_by_path - open a block device by name@path: path to the block device to open@mode: FMODE_* mask@holder: exclusive holder identifier Open the blockdevice described by the device file at @path. @mode* and @holder are identical to blkdev_get().
blkdev_get_by_dev	lkdev_get_by_dev - open a block device by device number@dev: device number of block device to open@mode: FMODE_* mask@holder: exclusive holder identifier Open the blockdevice described by device number @dev. @mode and
blkdev_open
swsusp_swap_check	swsusp_swap_check - check if the resume device is a swap device* and get its index (if so)* This is called before saving image

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告