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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>		History 2023-10-05 13:42:11 +02:00
..
dir.c	fs/sysfs/dir.c: replace S_IRWXU|S_IRUGO|S_IXUGO with 0755 sysfs_create_dir_ns()	2021-10-05 16:35:05 +02:00
file.c	kernfs: sysfs: support custom llseek method for sysfs entries	2023-10-05 13:42:11 +02:00
group.c	sysfs: Skip empty folders creation	2023-06-15 13:37:53 +02:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
mount.c	kernfs: move struct kernfs_root out of the public view.	2022-02-23 15:46:34 +01:00
symlink.c	docs: filesystems: fix renamed references	2020-04-20 15:45:22 -06:00
sysfs.h	sysfs: split out binary attribute handling from sysfs_add_file_mode_ns	2021-09-14 16:59:46 +02:00