evie/android_kernel_oneplus_msm8998
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drbd: new-connection and new-minor succeed, if the object already exists

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Follow O_CREAT semantics when creating connection or minor device/volume
objects.  If we need O_CREAT|O_EXCL semantics some time down the road,
we can add NLM_F_EXCL to the netlink message flags.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2011-03-14 13:22:35 +01:00 • committed by Philipp Reisner
parent cffec5b2fe
commit 38f19616d2
1 changed files with 14 additions and 2 deletions
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12
drivers/block/drbd/drbd_nl.c
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@ -2590,8 +2590,11 @@ int drbd_adm_create_connection(struct sk_buff *skb, struct genl_info *info)
goto out; goto out;
if (adm_ctx.tconn) { if (adm_ctx.tconn) {
if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
retcode = ERR_INVALID_REQUEST; retcode = ERR_INVALID_REQUEST;
drbd_msg_put_info("connection exists"); drbd_msg_put_info("connection exists");
}
/* else: still NO_ERROR */
goto out; goto out;
} }
@ -2626,6 +2629,15 @@ int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
goto out; goto out;
} }
/* drbd_adm_prepare made sure already
* that mdev->tconn and mdev->vnr match the request. */
if (adm_ctx.mdev) {
if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
retcode = ERR_MINOR_EXISTS;
/* else: still NO_ERROR */
goto out;
}
retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume); retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
out: out:
drbd_adm_finish(info, retcode); drbd_adm_finish(info, retcode);