get device flags by device name
hope you can help me: I'm trying to determine whether the device is removable or not, all i have is device name (/dev/sdc). Actually, I need to determine when the file on removable media or on local disk by full path of this file.
I've tryed to search in the current->fs->pwd and all I could find is a set of flags here: *current->fs->pwd.mnt->mnt_sb->s_bdev->bd_disk->flags* where GENHD_FL_RE开发者_运维知识库MOVABLE set for removable devices
But i always get the same flags set (as i understand, s_bdev always points to the same device (/dev/sda)).
So now i get the device name (/dev/sdc) that contains my file by parsing mtab, but still can't find out, removable it or not.
Is there possible way to get block_device structure by device name? (for example, "file" structure may be obtained by calling fd = open("name") fl = fged(fd) where fl points to "file" structure)
You can iterate over block devices using class_dev_iter_init
and class_dev_iter_next
. See the code in block/genhd.c
blk_lookup_devt
for usage.
Once you have the device, you can use dev_to_disk
to get a struct gendisk *
, in which you can check the removable flag.
Read /sys/block/dev-name/removable as it should contain 1 if the device is removable or 0 if not. (dev-name = the device's name: sda, hda, fd0, ...)
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