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| author | Paul Clements <paul.clements@steeleye.com> | 2013-07-03 15:09:04 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-20 17:16:07 -0700 |
| commit | 0fa759d293854180e00571def0752eeda880c72e (patch) | |
| tree | ad5820a02125d3e489ebb919f52f336b8e411a88 | |
| parent | 1e7e4c9ae2a78a6791a2ca91a6a400f94855f01e (diff) | |
| download | linux-stable-0fa759d293854180e00571def0752eeda880c72e.tar.gz linux-stable-0fa759d293854180e00571def0752eeda880c72e.tar.bz2 linux-stable-0fa759d293854180e00571def0752eeda880c72e.zip | |
nbd: correct disconnect behavior
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@steeleye.com>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/block/nbd.c | 7 | ||||
| -rw-r--r-- | include/linux/nbd.h | 1 |
2 files changed, 7 insertions, 1 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 5b9413766c3e..086715946444 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -623,8 +623,10 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, if (!nbd->sock) return -EINVAL; + nbd->disconnect = 1; + nbd_send_req(nbd, &sreq); - return 0; + return 0; } case NBD_CLEAR_SOCK: { @@ -654,6 +656,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, 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); @@ -743,6 +746,8 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, 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; } diff --git a/include/linux/nbd.h b/include/linux/nbd.h index 4871170a04a0..ae4981ebd18e 100644 --- a/include/linux/nbd.h +++ b/include/linux/nbd.h @@ -41,6 +41,7 @@ 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 |