Valentine Sinitsyn 0fedefd4c4 kernfs: sysfs: support custom llseek method for sysfs entries ... As of now, seeking in sysfs files is handled by generic_file_llseek(). There are situations where one may want to customize seeking logic: - Many sysfs entries are fixed files while generic_file_llseek() accepts past-the-end positions. Not only being useless by itself, this also means a bug in userspace code will trigger not at lseek(), but at some later point making debugging harder. - generic_file_llseek() relies on f_mapping->host to get the file size which might not be correct for all sysfs entries. See commit 636b21b501 ("PCI: Revoke mappings like devmem") as an example. Implement llseek method to override this behavior at sysfs attribute level. The method is optional, and if it is absent, generic_file_llseek() is called to preserve backwards compatibility. Signed-off-by: Valentine Sinitsyn <valesini@yandex-team.ru> Link: https://lore.kernel.org/r/20230925084013.309399-1-valesini@yandex-team.ru Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-10-05 13:42:11 +02:00
..
dir.c	Driver core changes for 6.6-rc1	2023-09-01 09:43:18 -07:00
file.c	kernfs: sysfs: support custom llseek method for sysfs entries	2023-10-05 13:42:11 +02:00
inode.c	v6.6-vfs.tmpfs	2023-08-28 09:55:25 -07:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
kernfs-internal.h	kernfs: Use a per-fs rwsem to protect per-fs list of kernfs_super_info.	2023-03-29 12:23:45 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
mount.c	kernfs: attach uuid for every kernfs and report it in fsid	2023-08-05 08:32:39 +02:00
symlink.c	kernfs: fix all kernel-doc warnings and multiple typos	2022-11-23 19:28:26 +01:00