This is a note to let you know that I've just added the patch titled
nbd: correct disconnect behavior
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nbd-correct-disconnect-behavior.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c378f70adbc1bbecd9e6db145019f14b2f688c7c Mon Sep 17 00:00:00 2001
From: Paul Clements <paul.clements@xxxxxxxxxxxx>
Date: Wed, 3 Jul 2013 15:09:04 -0700
Subject: nbd: correct disconnect behavior
From: Paul Clements <paul.clements@xxxxxxxxxxxx>
commit c378f70adbc1bbecd9e6db145019f14b2f688c7c upstream.
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 <paul.clements@xxxxxxxxxxxx>
Acked-by: Rob Landley <rob@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[xr: Backported to 3.4: adjust context]
Signed-off-by: Rui Xiang <rui.xiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/nbd.c | 8 +++++++-
include/linux/nbd.h | 1 +
2 files changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -590,8 +590,11 @@ static int __nbd_ioctl(struct block_devi
nbd_cmd(&sreq) = NBD_CMD_DISC;
if (!nbd->sock)
return -EINVAL;
+
+ nbd->disconnect = 1;
+
nbd_send_req(nbd, &sreq);
- return 0;
+ return 0;
}
case NBD_CLEAR_SOCK: {
@@ -620,6 +623,7 @@ static int __nbd_ioctl(struct block_devi
nbd->sock = SOCKET_I(inode);
if (max_part > 0)
bdev->bd_invalidated = 1;
+ nbd->disconnect = 0; /* we're connected now */
return 0;
} else {
fput(file);
@@ -691,6 +695,8 @@ static int __nbd_ioctl(struct block_devi
set_capacity(nbd->disk, 0);
if (max_part > 0)
ioctl_by_bdev(bdev, BLKRRPART, 0);
+ if (nbd->disconnect) /* user requested, ignore socket errors */
+ return 0;
return nbd->harderror;
}
--- a/include/linux/nbd.h
+++ b/include/linux/nbd.h
@@ -68,6 +68,7 @@ struct nbd_device {
u64 bytesize;
pid_t pid; /* pid of nbd-client, if attached */
int xmit_timeout;
+ int disconnect; /* a disconnect has been requested by user */
};
#endif
Patches currently in stable-queue which might be from paul.clements@xxxxxxxxxxxx are
queue-3.4/nbd-correct-disconnect-behavior.patch
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