Konstantin Khlebnikov 17d0774f80 sysfs: correctly handle read offset on PREALLOC attrs ... Attributes declared with __ATTR_PREALLOC use sysfs_kf_read() which returns zero bytes for non-zero offset. This breaks script checkarray in mdadm tool in debian where /bin/sh is 'dash' because its builtin 'read' reads only one byte at a time. Script gets 'i' instead of 'idle' when reads current action from /sys/block/$dev/md/sync_action and as a result does nothing. This patch adds trivial implementation of partial read: generate whole string and move required part into buffer head. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: 4ef67a8c95 ("sysfs/kernfs: make read requests on pre-alloc files use the buffer.") Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=787950 Cc: Stable <stable@vger.kernel.org> # v3.19+ Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2016-08-31 15:14:44 +02:00
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Kconfig	kernfs: add CONFIG_KERNFS	2014-02-07 16:08:57 -08:00
Makefile	sysfs, kernfs: move inode code to fs/kernfs/inode.c	2013-11-29 17:55:10 -08:00
dir.c	sysfs: Add support for permanently empty directories to serve as mount points.	2015-07-01 10:36:45 -05:00
file.c	sysfs: correctly handle read offset on PREALLOC attrs	2016-08-31 15:14:44 +02:00
group.c	platform/chrome: Branch for v4.4	2015-11-13 21:53:18 -08:00
mount.c	kernfs: The cgroup filesystem also benefits from SB_I_NOEXEC	2016-06-23 15:41:56 -05:00
symlink.c	kernfs: s/sysfs/kernfs/ in constants	2013-12-11 17:39:20 -08:00
sysfs.h	kernfs: s/sysfs_dirent/kernfs_node/ and rename its friends accordingly	2013-12-11 15:28:36 -08:00