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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
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doc/btrbk.1.asciidoc
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@ -366,12 +366,17 @@ different output formats.
Print new files since subvolume <from> for subvolume <to>. Print new files since subvolume <from> for subvolume <to>.
*extents-diff* <path>... [exclusive <filter>...] _*experimental*_:: *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 List accurate size and diff from extent information (FIEMAP ioctl,
complement of block regions) from the 'subvol' of the previous slow!).
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 DIFF column shows the data added to the previous subvolume
the 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>' If called with the 'exclusive' keyword, subvolumes matching '<filter>'
are added to a separate set, and the exclusive data is computed for are added to a separate set, and the exclusive data is computed for