Bug 176169 - [vfs] [patch] system unresponsive for 1min after mounting flash read-only
Summary: [vfs] [patch] system unresponsive for 1min after mounting flash read-only
Status: Open
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: Unspecified
Hardware: Any Any
: Normal Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords: patch
Depends on:
Blocks:
 
Reported: 2013-02-15 13:50 UTC by nkoch
Modified: 2022-10-17 12:39 UTC (History)
1 user (show)

See Also:

Attachments
file.diff (970 bytes, patch)
2013-02-15 13:50 UTC, nkoch 		no flags Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description nkoch 2013-02-15 13:50:03 UTC 
This problem has already been reported and fixed(?) in pfsense's bug tracking
system by adding the sysctl vfs.forcesync.
The author of the fix is Ermal Luçi ( http://redmine.pfsense.org/users/6 ).

http://redmine.pfsense.org/projects/pfsense-tools/repository/revisions/008742971cb44d8c0f81929504ab7330442c4ba4/entry/patches/RELENG_8_3/vfs_subr_mount_RO.diff

I tried this under FreeBSD 9.1 and it seems to work.

mount -ow / ; time mount -orf /
 : 65s without patch

With patch time is <1s.

As I am no vfs expert I do not know what potential negative consequences
this change may have.

The original patch uses CTLFLAG_RD for forcesync. I do not see why
this should not be CTLFLAG_RW.
Comment 1 Eitan Adler freebsd_committer freebsd_triage 2017-12-31 07:58:21 UTC 
For bugs matching the following criteria:

Status: In Progress Changed: (is less than) 2014-06-01

Reset to default assignee and clear in-progress tags.

Mail being skipped
Comment 2 Graham Perrin freebsd_committer freebsd_triage 2022-10-17 12:39:27 UTC 
Keyword: 

    patch
or  patch-ready

– in lieu of summary line prefix: 

    [patch]

* bulk change for the keyword
* summary lines may be edited manually (not in bulk). 

Keyword descriptions and search interface: 

    <https://bugs.freebsd.org/bugzilla/describekeywords.cgi>