From: Emmanouil Vamvakopoulos <emmanouil.vamvakopoulos@ijclab.in2p3.fr>
To: linux-xfs@vger.kernel.org
Subject: s_bmap and flags explanation
Date: Wed, 3 Aug 2022 16:56:43 +0200 (CEST) [thread overview]
Message-ID: <1106593372.70825641.1659538603200.JavaMail.zimbra@ijclab.in2p3.fr> (raw)
In-Reply-To: <1586129076.70820212.1659538177737.JavaMail.zimbra@ijclab.in2p3.fr>
Hello developers
It is possible to explain the FLAGS field in xfs_bmap output of a file
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS
0: [0..7]: 49700520968..49700520975 30 (8..15) 8 001111
1: [8..4175871]: 49708756480..49712932343 30 (8235520..12411383) 4175864 000111
2: [4175872..19976191]: 49715788288..49731588607 30 (15267328..31067647) 15800320 000011
3: [19976192..25153535]: 49731588608..49736765951 30 (31067648..36244991) 5177344 000011
4: [25153536..41930743]: 49767625216..49784402423 30 (67104256..83881463) 16777208 000111
5: [41930744..58707951]: 49784402424..49801179631 30 (83881464..100658671) 16777208 001111
6: [58707952..58959935]: 49801179632..49801431615 30 (100658672..100910655) 251984 001111
7: [58959936..75485159]: 49801431616..49817956839 30 (100910656..117435879) 16525224 001111
with
[disk06]# du -sh ./00000869/014886f4
36G ./00000869/014886f4
[disk06]# du -sh --apparent-size ./00000869/014886f4
29G ./00000869/014886f4
I try to understand if this file contains unused externs
and how those file are created like this (if we assume that the free space was not fragmented )
we are running CentOS Stream release 8 with 4.18.0-383.el8.x86_64
if I defrag the file above the difference bewteen apparent size and size with du disappered !
thank you in advance
best
e.v.
next parent reply other threads:[~2022-08-03 15:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1586129076.70820212.1659538177737.JavaMail.zimbra@ijclab.in2p3.fr>
2022-08-03 14:56 ` Emmanouil Vamvakopoulos [this message]
2022-08-03 15:54 ` s_bmap and flags explanation Carlos Maiolino
2022-08-03 21:59 ` Dave Chinner
2022-08-04 10:25 ` Emmanouil Vamvakopoulos
2022-08-04 13:30 ` Carlos Maiolino
2022-08-04 22:55 ` Dave Chinner
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