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    block: Do not cache device size for removable media · 46a4e4e6
    Stefan Hajnoczi 提交于
    The block layer caches the device size to avoid doing lseek(fd, 0,
    SEEK_END) every time this value is needed.  For removable media the
    device size becomes stale if a new medium is inserted.  This patch
    simply prevents device size caching for removable media.
    
    A smarter solution is to update the cached device size when a new medium
    is inserted.  Given that there are currently bugs with CD-ROM media
    change I do not want to implement that approach until we've gotten
    things correct first.
    Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
    Signed-off-by: NKevin Wolf <kwolf@redhat.com>
    46a4e4e6
block.c 81.6 KB