1. 01 8月, 2012 1 次提交
    • V
      block: add partition resize function to blkpg ioctl · c83f6bf9
      Vivek Goyal 提交于
      Add a new operation code (BLKPG_RESIZE_PARTITION) to the BLKPG ioctl that
      allows altering the size of an existing partition, even if it is currently
      in use.
      
      This patch converts hd_struct->nr_sects into sequence counter because
      One might extend a partition while IO is happening to it and update of
      nr_sects can be non-atomic on 32bit machines with 64bit sector_t. This
      can lead to issues like reading inconsistent size of a partition. Sequence
      counter have been used so that readers don't have to take bdev mutex lock
      as we call sector_in_part() very frequently.
      
      Now all the access to hd_struct->nr_sects should happen using sequence
      counter read/update helper functions part_nr_sects_read/part_nr_sects_write.
      There is one exception though, set_capacity()/get_capacity(). I think
      theoritically race should exist there too but this patch does not
      modify set_capacity()/get_capacity() due to sheer number of call sites
      and I am afraid that change might break something. I have left that as a
      TODO item. We can handle it later if need be. This patch does not introduce
      any new races as such w.r.t set_capacity()/get_capacity().
      
      v2: Add CONFIG_LBDAF test to UP preempt case as suggested by Phillip.
      Signed-off-by: NVivek Goyal <vgoyal@redhat.com>
      Signed-off-by: NPhillip Susi <psusi@ubuntu.com>
      Signed-off-by: NJens Axboe <axboe@kernel.dk>
      c83f6bf9
  2. 27 4月, 2006 1 次提交
  3. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4