Christian Brauner 1d4ee94a51 fs: add real_fs to track task's actual fs_struct ...

Add a real_fs field to task_struct that always mirrors the fs field.
This lays the groundwork for distinguishing between a task's permanent
fs_struct and one that is temporarily overridden via scoped_with_init_fs().

When a kthread temporarily overrides current->fs for path lookup, we
need to know the original fs_struct for operations like exit_fs() and
unshare_fs_struct() that must operate on the real, permanent fs.

For now real_fs is always equal to fs. It is maintained alongside fs in
all the relevant paths: exit_fs(), unshare_fs_struct(),
switch_fs_struct(), and copy_fs().

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-4-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

2026-06-29 10:43:45 +02:00

..

array.c

fs: add real_fs to track task's actual fs_struct

2026-06-29 10:43:45 +02:00

base.c

fs: add real_fs to track task's actual fs_struct

2026-06-29 10:43:45 +02:00

bootconfig.c

fs/proc: Skip bootloader comment if no embedded kernel parameters

2024-04-09 23:36:18 +09:00

cmdline.c

proc: mark /proc/cmdline as permanent

2023-02-02 22:50:02 -08:00

consoles.c

proc: Add nbcon support for /proc/consoles

2024-09-04 15:56:33 +02:00

cpuinfo.c

x86/aperfmperf: Replace aperfmperf_get_khz()

2022-04-27 20:22:19 +02:00

devices.c

proc: mark more files as permanent

2022-10-03 14:21:45 -07:00

fd.c

proc: protect ptrace_may_access() with exec_update_lock (FD links)

2026-06-05 10:00:55 +02:00

fd.h

fs: port ->permission() to pass mnt_idmap

2023-01-19 09:24:28 +01:00

generic.c

Merge tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-06-21 13:20:19 -07:00

inode.c

fs/proc: replace "__auto_type" with "const auto"

2025-12-08 15:32:15 -08:00

internal.h

proc: protect ptrace_may_access() with exec_update_lock (FD links)

2026-06-05 10:00:55 +02:00

interrupts.c

fs/procfs: Switch to irq_get_nr_irqs()

2024-10-16 21:56:59 +02:00

Kconfig

virtio-mem: support CONFIG_PROC_VMCORE_DEVICE_RAM

2025-01-27 09:39:25 -05:00

kcore.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

kmsg.c

Merge tag 'printk-for-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

2022-10-10 11:24:19 -07:00

loadavg.c

proc: mark more files as permanent

2022-10-03 14:21:45 -07:00

Makefile

genirq/proc: Speed up /proc/interrupts iteration

2026-05-26 16:21:15 +02:00

meminfo.c

Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-15 12:59:16 -07:00

namespaces.c

proc: protect ptrace_may_access() with exec_update_lock (part 1)

2026-06-05 10:00:55 +02:00

nommu.c

fs: create helper file_user_path() for user displayed mapped file path

2023-10-19 11:03:15 +02:00

page.c

fs/proc/page: remove unused KPMBITS

2025-11-20 14:03:42 -08:00

proc_net.c

proc: subset=pid: Show /proc/self/net only for CAP_NET_ADMIN

2026-05-11 23:13:01 +02:00

proc_sysctl.c

VFS: use wait_var_event for waiting in d_alloc_parallel()

2026-06-05 00:34:54 -04:00

proc_tty.c

proc: delete unused <linux/uaccess.h> includes

2022-07-17 17:31:39 -07:00

root.c

proc: handle subset=pid separately in userns visibility checks

2026-05-11 23:13:02 +02:00

self.c

fs/proc: Don't lock root inode when creating "self" and "thread-self"

2026-03-06 10:24:11 +01:00

softirqs.c

proc/softirqs: replace seq_printf with seq_put_decimal_ull_width

2024-11-07 07:40:14 -10:00

stat.c

Merge tag 'timers-nohz-2026-06-13' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip

2026-06-15 13:48:52 +05:30

task_mmu.c

fs/proc/task_mmu: do not warn on seeing non-migration pmd entry

2026-06-08 18:21:32 -07:00

task_nommu.c

fs/proc/task_mmu: factor out proc_maps_private fields used by PROCMAP_QUERY

2025-09-13 16:54:48 -07:00

thread_self.c

fs/proc: Don't lock root inode when creating "self" and "thread-self"

2026-03-06 10:24:11 +01:00

uptime.c

tick/sched: Consolidate idle time fetching APIs

2026-06-02 21:27:26 +02:00

util.c

fs/proc/util.c: include fs/proc/internal.h for name_to_int()

2019-01-04 13:13:45 -08:00

version.c

proc: mark more files as permanent

2022-10-03 14:21:45 -07:00

vmcore.c

mm: rename my_zero_pfn() to zero_pfn()

2026-04-05 13:53:01 -07:00