ambiser
/
btrbk
mirror of https://github.com/digint/btrbk
9
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

documentation: better extents-diff documentation

pull/358/head
Axel Burri 2020-11-08 22:09:56 +01:00
parent 22b71bf7da
commit 59ee4d6ebf
1 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
doc/btrbk.1.asciidoc
View File

@ -366,12 +366,17 @@ different output formats.
Print new files since subvolume <from> for subvolume <to>.
*extents-diff* <path>... [exclusive <filter>...] _*experimental*_::
List estimated size and diff from extent information (FIEMAP ioctl)
from filefrag(8). The 'diff' column shows the data added (relative
complement of block regions) from the 'subvol' of the previous
line. In the best case (if no other files hold references to the
extents in question) the 'diff' data would be freed when deleting
the subvolume.
List accurate size and diff from extent information (FIEMAP ioctl,
slow!).
+
The DIFF column shows the data added to the previous subvolume
(relative complement of block regions).
+
The EXCLUSIVE column shows the set-exclusive data (relative complement
of block regions of all other listed (!) subvolumes). If all
subvolumes which hold references to the extents in question are
listed, the exclusive data would be freed when deleting the subvolume.
+
If called with the 'exclusive' keyword, subvolumes matching '<filter>'
are added to a separate set, and the exclusive data is computed for