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authorKevin Wolf <kwolf@redhat.com>2020-07-17 12:54:25 +0200
committerKevin Wolf <kwolf@redhat.com>2020-07-17 14:20:57 +0200
commitbca5283bd4a086bcbfaddc024491a400cc9b2fa9 (patch)
tree38fd2929ac16434c9c3e9cfa835f2d4e7ea6cb8a /.gitignore
parent20eaf1bf6ef1df916cb7ea2d06d1e868f238835f (diff)
file-posix: Fix check_hdev_writable() with auto-read-only
For Linux block devices, being able to open the device read-write doesn't necessarily mean that the device is actually writable (one example is a read-only LV, as you get with lvchange -pr <device>). We have check_hdev_writable() to check this condition and fail opening the image read-write if it's not actually writable. However, this check doesn't take auto-read-only into account, but results in a hard failure instead of downgrading to read-only where possible. Fix this and do the writable check not based on BDRV_O_RDWR, but only when this actually results in opening the file read-write. A second check is inserted in raw_reconfigure_getfd() to have the same check when dynamic auto-read-only upgrades an image file from read-only to read-write. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200717105426.51134-3-kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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