user/sven/linux.git/include/linux/nbd.h, branch v3.14.29

nbd: correct disconnect behavior

2013-07-03T23:08:05Z

Currently, when a disconnect is requested by the user (via NBD_DISCONNECT ioctl) the return from NBD_DO_IT is undefined (it is usually one of several error codes). This means that nbd-client does not know if a manual disconnect was performed or whether a network error occurred. Because of this, nbd-client's persist mode (which tries to reconnect after error, but not after manual disconnect) does not always work correctly. This change fixes this by causing NBD_DO_IT to always return 0 if a user requests a disconnect. This means that nbd-client can correctly either persist the connection (if an error occurred) or disconnect (if the user requested it). Signed-off-by: Paul Clements Acked-by: Rob Landley Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

UAPI: (Scripted) Disintegrate include/linux

2012-10-13T09:46:48Z

Signed-off-by: David Howells Acked-by: Arnd Bergmann Acked-by: Thomas Gleixner Acked-by: Michael Kerrisk Acked-by: Paul E. McKenney Acked-by: Dave Jones

nbd: handle discard requests

2012-10-05T18:05:24Z

Add discard support to nbd. If the nbd-server supports discard, it will send NBD_FLAG_SEND_TRIM to the client. The client will then set the flag in the kernel via NBD_SET_FLAGS, which tells the kernel to enable discards for the device (QUEUE_FLAG_DISCARD). If discard support is enabled, then when the nbd client system receives a discard request, this will be passed along to the nbd-server. When the discard request is received by the nbd-server, it will perform: fallocate(.. FALLOC_FL_PUNCH_HOLE ..) To punch a hole in the backend storage, which is no longer needed. Signed-off-by: Paul Clements Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

nbd: add set flags ioctl

2012-10-05T18:05:23Z

Add a set-flags ioctl, allowing various option flags to be set on an nbd device. This allows the nbd-client to set the device flags (to enable read-only mode, or enable discard support, etc.). Flags are typically specified by the nbd-server. During the negotiation phase of the nbd connection, the server sends its flags to the client. The client then uses NBD_SET_FLAGS to inform the kernel of the options. Also included is a one-line fix to debug output for the set-timeout ioctl. Signed-off-by: Paul Clements Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

header: fix broken headers for user space

2010-08-23T04:15:39Z

__packed is only defined in kernel space, so we should use __attribute__((packed)) for the code shared between kernel and user space. Two __attribute() annotations are replaced with __attribute__() too. Signed-off-by: Changli Gao Signed-off-by: David S. Miller

net: use __packed annotation

2010-06-03T10:21:52Z

cleanup patch. Use new __packed annotation in net/ and include/ (except netfilter) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

nbd: delete superfluous test for GNUC

2008-04-29T15:06:24Z

Since already tests for __GNUC__, there's no point in nbd.h repeating that test. Signed-off-by: Robert P. J. Day Cc: Paul Clements Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

NBD: allow nbd to be used locally

2008-04-29T15:06:23Z

This patch allows Network Block Device to be mounted locally (nbd-client to nbd-server over 127.0.0.1). It creates a kthread to avoid the deadlock described in NBD tools documentation. So, if nbd-client hangs waiting for pages, the kblockd thread can continue its work and free pages. I have tested the patch to verify that it avoids the hang that always occurs when writing to a localhost nbd connection. I have also tested to verify that no performance degradation results from the additional thread and queue. Patch originally from Laurent Vivier. Signed-off-by: Paul Clements Signed-off-by: Laurent Vivier Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

NBD: remove limit on max number of nbd devices

2008-02-08T17:22:41Z

Remove the arbitrary 128 device limit for NBD. nbds_max can now be set to any number. In certain scenarios where devices are used sparsely we have run into the 128 device limit. Signed-off-by: Paul Clements Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

NBD: allow hung network I/O to be cancelled

2007-10-17T15:42:55Z

Allow NBD I/O to be cancelled when a network outage occurs. Previously, I/O would just hang, and if enough I/O was hung in nbd, the system (at least user-level) would completely hang until a TCP timeout (default, 15 minutes) occurred. The patch introduces a new ioctl NBD_SET_TIMEOUT that allows a transmit timeout value (in seconds) to be specified. Any network send that exceeds the timeout will be cancelled and the nbd connection will be shut down. I've tested with various timeout values and 6 seconds seems to be a good choice for the timeout. If the NBD_SET_TIMEOUT ioctl is not called, you get the old (I/O hang) behavior. Signed-off-by: Paul Clements Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds