Edit link option disappeared

Question

Hi ,
am facing a strange issue where the “Edit Link” option under “Quick Launch” in SharePoint 2013 is not appearing for any user (including the farm and site collection  administrators) in
the home page of the root site collection. If a new sub site is created under it, then it starts appearing.
may i know, anyone has faced this issue and the possible resolution.

Answer 1

If the Edit link is not available, the site collection has moved to read only mode. This normally happens when you take dont take proper backup of site collection or backup was cancelled while in progress
http://technet.microsoft.com/en-us/library/ff631148%28v=office.14%29.aspx
Verify that you have the following administrative credentials.
You must be a member of the Site Collection Administrators group for the site collection.
In Central Administration, click Application Management.
On the Application Management page, in the Site Collections section, click
Configure quotas and locks.
If the site collection you want isn't already selected, in the Site Collection section, on the
Site Collection menu, click Change Site Collection. Use the Select Site Collection page to select a site collection.
On the Site Collection Quotas and Locks page, in the Site Lock Information section, select one of the following options:
Not locked to unlock the site collection and make it available to users.
Adding content prevented to prevent users from adding new content to the site collection. Updates and deletions are still allowed.
Read-only (blocks additions, updates, and deletions) to prevent users from adding, updating, or deleting content.
No access to prevent users from accessing the site collection and its content. Users who attempt to access the site receive an error.
If you select Adding content prevented, Read-only (blocks additions, updates, and deletions), or
No access, type a reason for the lock in the Additional lock information box.
Click OK.
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