++
+NOTE: historically, any user could create a snapshot even if he was not owner
+of the source subvolume, the subvolume deletion has been restricted for that
+reason. The subvolume creation has been restricted but this mount option is
+still required. This is a usability issue and will be addressed in the future.
+
+DEPRECATED MOUNT OPTIONS
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+List of mount options that have been removed, kept for backward compatibility.
+
+*alloc_start='bytes'*::
+(default: 1M, minimum: 1M, deprecated since: 4.13)
++
+Debugging option to force all block allocations above a certain
+byte threshold on each block device. The value is specified in
+bytes, optionally with a K, M, or G suffix (case insensitive).
+
+*recovery*::
+(since: 3.2, default: off, deprecated since: 4.5)
++
+NOTE: this option has been replaced by 'usebackuproot' and should not be used
+but will work on 4.5+ kernels.
+
+*subvolrootid='objectid'*::
+(irrelevant since: 3.2, formally deprecated since: 3.10)
++
+A workaround option from times (pre 3.2) when it was not possible to mount a
+subvolume that did not reside directly under the toplevel subvolume.
+
+NOTES ON GENERIC MOUNT OPTIONS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Some of the general mount options from `mount`(8) that affect BTRFS and are
+worth mentioning.
+
+*noatime*::
+under read intensive work-loads, specifying 'noatime' significantly improves
+performance because no new access time information needs to be written. Without
+this option, the default is 'relatime', which only reduces the number of
+inode atime updates in comparison to the traditional 'strictatime'. The worst
+case for atime updates under 'relatime' occurs when many files are read whose
+atime is older than 24 h and which are freshly snapshotted. In that case the
+atime is updated 'and' COW happens - for each file - in bulk. See also
+https://lwn.net/Articles/499293/ - 'Atime and btrfs: a bad combination? (LWN, 2012-05-31)'.
++
+Note that 'noatime' may break applications that rely on atime uptimes like
+the venerable Mutt (unless you use maildir mailboxes).
+