diff options
| author | Paul Clements <paul.clements@steeleye.com> | 2013-07-03 15:09:04 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-07-27 05:34:29 +0100 |
| commit | b5f8e9877feee4ae448f5d2294278548ac6a06ba (patch) | |
| tree | 0cebb52c50aaaa7be00d29117cf70d3ef4ed606e /drivers/block | |
| parent | c8b425eba162f29a3544ad8d137194428a9e7411 (diff) | |
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>
[bwh: Backported to 3.2: adjust device pointer name]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/nbd.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 4d62fe076b8..5fb6885516f 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -598,8 +598,10 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo, if (!lo->sock) return -EINVAL; + lo->disconnect = 1; + nbd_send_req(lo, &sreq); - return 0; + return 0; } case NBD_CLEAR_SOCK: { @@ -629,6 +631,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo, lo->sock = SOCKET_I(inode); if (max_part > 0) bdev->bd_invalidated = 1; + lo->disconnect = 0; /* we're connected now */ return 0; } else { fput(file); @@ -701,6 +704,8 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo, set_capacity(lo->disk, 0); if (max_part > 0) ioctl_by_bdev(bdev, BLKRRPART, 0); + if (lo->disconnect) /* user requested, ignore socket errors */ + return 0; return lo->harderror; } |