The current implementation of the CDROM_MEDIA_CHANGED ioctl relies on
global state, meaning that only one process can detect a disc change
while the ioctl call will return 0 for other calling processes afterwards
(see bug 213267).
This introduces a new cdrom ioctl, CDROM_TIMED_MEDIA_CHANGE, that
works by maintaining a timestamp of the last detected disc change instead
of a boolean flag: Processes calling this ioctl command can provide
a timestamp of the last disc change known to them and receive
an indication whether the disc was changed since then and the updated
timestamp.
I considered fixing the buggy behavior in the original
CDROM_MEDIA_CHANGED ioctl but that would require maintaining state
for each calling process in the kernel, which seems like a worse
solution than introducing this new ioctl.
Signed-off-by: Lukas Prediger <lumip@lumip.de>
Link: https://lore.kernel.org/all/20210912191207.74449-1-lumip@lumip.de
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210913230942.1188-1-phil@philpotter.co.uk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
-----BEGIN PGP SIGNATURE-----
iQFDBAABCAAtFiEEIw+MvkEiF49krdp9F0NaE2wMflgFAl81p3sPHGNvcmJldEBs
d24ubmV0AAoJEBdDWhNsDH5YTDAH/i+boeUlQsiobPcnfF7jxjQWd2wy9GVT6y7k
RQsifOIIsJZB8DN/ChYbeFemtnn495HaIrwN4QvQss82A2NpaGYCRR8D4vncqLHL
1K36JLHE/5dOFvaKUvAVIquEcwuyvmRNU0Bbyz/3kzNUf8KkovDzoJ7xZ/2n/fev
hksn3RChj1osJNViSGBkHEjF6NJ46gzNtbt4mW88/jDZNCENK7rZQWbwUvrvZ4ze
B1LfMFYuZhm6s4sooBxO6y2njuzmKLoykM9MQFr5PXLuexHTcMlS5mpHVqvQsJ8l
70G2zXZiGUwxboC1YW7aRUEhkASVsXTb077zOVYXWY6duUqWVFs=
=tuId
-----END PGP SIGNATURE-----
Merge tag 'docs-5.9-2' of git://git.lwn.net/linux
Pull documentation fixes from Jonathan Corbet:
"A handful of obvious fixes that wandered in during the merge window"
* tag 'docs-5.9-2' of git://git.lwn.net/linux:
Documentation/locking/locktypes: fix the typo
doc/zh_CN: resolve undefined label warning in admin-guide index
doc/zh_CN: fix title heading markup in admin-guide cpu-load
docs: remove the 2.6 "Upgrading I2C Drivers" guide
docs: Correct the release date of 5.2 stable
mailmap: Update comments for with format and more detalis
docs: cdrom: Fix a typo and rst markup
Doc: admin-guide: use correct legends in kernel-parameters.txt
Documentation/features: refresh RISC-V arch support files
documentation: coccinelle: Improve command example for make C={1,2}
Core-api: Documentation: Replace deprecated :c:func: Usage
Dev-tools: Documentation: Replace deprecated :c:func: Usage
Filesystems: Documentation: Replace deprecated :c:func: Usage
docs: trace: fix a typo
"The capability fags" should be "The capability flags".
In rst markup, a incorrect markup expression is causing bad rendering in
Sphinx output. Replace the erroneous single quote by a backquote.
Signed-off-by: Remi Andruccioli <remi.andruccioli@gmail.com>
Link: https://lore.kernel.org/r/20200808163123.17643-1-remi.andruccioli@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
As well as the ->media_changed method. All these are left over from
before the drivers were switched over to the check_events scheme.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
The stuff there is almost already at ReST format. A
conversion for them is trivial: just add a missing titles
and fix some scape codes for them to match ReST syntax.
While here, rename the cdrom-standard.txt, with was converted
from LaTeX to ReST on the previous patch, and add it to the
index file.
At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Paul Gortmaker