[PATCH v3 0/3] nbd: resolve bugs and limitations

Pranay Kr. Srivastava
2016-06-24T10:09:52Z

This patch series fixes the following

1) fix might_sleep warning on socket shutdown:
Fix sock_shutdown to avoid calling kernel_sock_shutdown
while holding spin_lock.

2) cleanup nbd_set_socket
Simple fixes to nbd_set_socket.

3) make nbd device wait for its users.
When a timeout or error occurs then nbd driver simply kills
the block device. Many filesystem(s) example ext2/ext3 don't
expect their buffer heads to disappear like that. Fix this
by making nbd device wait for its users.

The same work function is used to trigger the kill_bdev as well
do a sock_shutdown, depending on either a timeout/error occured
or a disconnect was issued.

Also avoid scheduling the work_fn in case a timeout for a request
has already occured.

Pranay Kr. Srivastava (3):
fix might_sleep warning on socket shutdown
cleanup nbd_set_socket
make nbd device wait for its users

drivers/block/nbd.c | 169 +++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 127 insertions(+), 42 deletions(-)

Changelog:

Rebased all patches above on git://git.pengutronix.de/git/mpa/linux-nbd.git,
commit:7ed71a8704eda7b75fbd0ed73fd0a5b6e469d250

3) make nbd device wait for its users.
Instead of using kref_sub just use kref_init and under the bd_mutex for
serializing on open/close.
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1.9.1