From bf18bee547d19fde314e7b6b81f21f68b46c8a92 Mon Sep 17 00:00:00 2001 From: Colin Lord Date: Mon, 6 Jun 2016 14:15:22 -0400 Subject: [PATCH] blockdev: clean up error handling in do_open_tray Returns negative error codes and accompanying error messages in cases where the device has no tray or the tray is locked and isn't forced open. This extra information should result in better flexibility in functions that call do_open_tray. Suggested by: Markus Armbruster Signed-off-by: Colin Lord Signed-off-by: Kevin Wolf --- blockdev.c | 46 ++++++++++++++++++++++++++++------------------ 1 file changed, 28 insertions(+), 18 deletions(-) diff --git a/blockdev.c b/blockdev.c index 6ccb8e1f84..7fd515a4fa 100644 --- a/blockdev.c +++ b/blockdev.c @@ -56,6 +56,8 @@ static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); +static int do_open_tray(const char *device, bool force, Error **errp); + static const char *const if_name[IF_COUNT] = { [IF_NONE] = "none", [IF_IDE] = "ide", @@ -2274,8 +2276,6 @@ exit: block_job_txn_unref(block_job_txn); } -static int do_open_tray(const char *device, bool force, Error **errp); - void qmp_eject(const char *device, bool has_force, bool force, Error **errp) { Error *local_err = NULL; @@ -2286,16 +2286,11 @@ void qmp_eject(const char *device, bool has_force, bool force, Error **errp) } rc = do_open_tray(device, force, &local_err); - if (local_err) { + if (rc && rc != -ENOSYS) { error_propagate(errp, local_err); return; } - - if (rc == EINPROGRESS) { - error_setg(errp, "Device '%s' is locked and force was not specified, " - "wait for tray to open and try again", device); - return; - } + error_free(local_err); qmp_x_blockdev_remove_medium(device, errp); } @@ -2324,11 +2319,16 @@ void qmp_block_passwd(bool has_device, const char *device, aio_context_release(aio_context); } -/** - * returns -errno on fatal error, +errno for non-fatal situations. - * errp will always be set when the return code is negative. - * May return +ENOSYS if the device has no tray, - * or +EINPROGRESS if the tray is locked and the guest has been notified. +/* + * Attempt to open the tray of @device. + * If @force, ignore its tray lock. + * Else, if the tray is locked, don't open it, but ask the guest to open it. + * On error, store an error through @errp and return -errno. + * If @device does not exist, return -ENODEV. + * If it has no removable media, return -ENOTSUP. + * If it has no tray, return -ENOSYS. + * If the guest was asked to open the tray, return -EINPROGRESS. + * Else, return 0. */ static int do_open_tray(const char *device, bool force, Error **errp) { @@ -2348,8 +2348,8 @@ static int do_open_tray(const char *device, bool force, Error **errp) } if (!blk_dev_has_tray(blk)) { - /* Ignore this command on tray-less devices */ - return ENOSYS; + error_setg(errp, "Device '%s' does not have a tray", device); + return -ENOSYS; } if (blk_dev_is_tray_open(blk)) { @@ -2366,7 +2366,9 @@ static int do_open_tray(const char *device, bool force, Error **errp) } if (locked && !force) { - return EINPROGRESS; + error_setg(errp, "Device '%s' is locked and force was not specified, " + "wait for tray to open and try again", device); + return -EINPROGRESS; } return 0; @@ -2375,10 +2377,18 @@ static int do_open_tray(const char *device, bool force, Error **errp) void qmp_blockdev_open_tray(const char *device, bool has_force, bool force, Error **errp) { + Error *local_err = NULL; + int rc; + if (!has_force) { force = false; } - do_open_tray(device, force, errp); + rc = do_open_tray(device, force, &local_err); + if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { + error_propagate(errp, local_err); + return; + } + error_free(local_err); } void qmp_blockdev_close_tray(const char *device, Error **errp) -- GitLab