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--- linux:fs:btrfs:subvolumes [2021/03/02 09:46] – created niziak
+++ linux:fs:btrfs:subvolumes [2024/07/11 20:07] (current) – niziak
@@ Line 21: / Line 21: @@
   * Install script [[https://github.com/agronick/btrfs-size]]
+==== Mixed mount options ====
+NOT SUPPORTED YET:
+  In general, btrfs doesn't _yet_ have the runtime infrastructure to handle
+  per-subvolume mount options.  The on-device format and general approach
+  in the kernel was designed to allow it, and it's on the roadmap, it just
+  hasn't been done... yet.
+To make workaround it is possible to use attributes on files or directories:
+  * C disable COW feature (for newly created directories or zero sized files). New files in directores with C attributes will be created with C attrib. But not subdirectories.
+  * c enable compression
+==== Move data between subvolumes ====
+See ''cp'' command arg:
+  When --reflink[=always] is specified, perform a lightweight copy, where the data blocks are copied  only  when  modified.
+  If  this  is  not  possible  the  copy  fails,  or  if --reflink=auto is specified, fall back to a standard copy.
+<code bash>
+cp -pr --reflink=always srcDirectory dstDirectory/
+rm -r srcDirectory
+</code>