3.6.11.7-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Paul Clements [ Upstream commit c378f70adbc1bbecd9e6db145019f14b2f688c7c ] 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 Signed-off-by: Steven Rostedt --- drivers/block/nbd.c | 6 ++++++ include/linux/nbd.h | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 31e9b4b..aec3470 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -594,6 +594,9 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, nbd_cmd(&sreq) = NBD_CMD_DISC; if (!nbd->sock) return -EINVAL; + + nbd->disconnect = 1; + nbd_send_req(nbd, &sreq); return 0; } @@ -624,6 +627,7 @@ 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); @@ -695,6 +699,8 @@ 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 d146ca1..e6fe174 100644 --- 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 -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/