linux-stable.git/include/linux/file.h, branch v6.11.2

file: fix typo in take_fd() comment

2024-08-12T20:03:27+00:00

The explanatory comment above take_fd() contains a typo, fix that to not
confuse readers.

Signed-off-by: Mathias Krause 
Link: https://lore.kernel.org/r/20240809135035.748109-1-minipli@grsecurity.net
Signed-off-by: Christian Brauner

file: add take_fd() cleanup helper

2024-06-28T08:36:45+00:00

Add a helper that returns the file descriptor and ensures that the old
variable contains a negative value. This makes it easy to rely on
CLASS(get_unused_fd).

Link: https://lore.kernel.org/r/20240627-work-pidfs-v1-1-7e9ab6cc3bb1@kernel.org
Reviewed-by: Jeff Layton 
Reviewed-by: Josef Bacik 
Reviewed-by: Alexander Mikhalitsyn 
Signed-off-by: Christian Brauner

file: add fd_raw cleanup class

2024-05-09T11:02:39+00:00

So we can also use CLASS(fd_raw, f)(fd) for codepaths where we allow
FMODE_PATH aka O_PATH file descriptors to be used.

Signed-off-by: Christian Brauner

file: add alloc_file_pseudo_noaccount()

2024-02-25T11:05:08+00:00

When we open block devices as files we want to make sure to not charge
them against the open file limit of the caller as that can cause
spurious failures.

Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-1-adbd023e19cc@kernel.org
Signed-off-by: Christian Brauner

file: remove __receive_fd()

2023-12-12T13:24:14+00:00

Honestly, there's little value in having a helper with and without that
int __user *ufd argument. It's just messy and doesn't really give us
anything. Just expose receive_fd() with that argument and get rid of
that helper.

Link: https://lore.kernel.org/r/20231130-vfs-files-fixes-v1-5-e73ca6f4ea83@kernel.org
Reviewed-by: Jan Kara 
Reviewed-by: Jens Axboe 
Signed-off-by: Christian Brauner

file: stop exposing receive_fd_user()

2023-12-12T13:24:14+00:00

Not every subsystem needs to have their own specialized helper.
Just us the __receive_fd() helper.

Link: https://lore.kernel.org/r/20231130-vfs-files-fixes-v1-4-e73ca6f4ea83@kernel.org
Reviewed-by: Jan Kara 
Reviewed-by: Jens Axboe 
Signed-off-by: Christian Brauner

locking: Introduce __cleanup() based infrastructure

2023-06-26T09:14:18+00:00

Use __attribute__((__cleanup__(func))) to build:

 - simple auto-release pointers using __free()

 - 'classes' with constructor and destructor semantics for
   scope-based resource management.

 - lock guards based on the above classes.

Signed-off-by: Peter Zijlstra (Intel) 
Link: https://lkml.kernel.org/r/20230612093537.614161713%40infradead.org

fs: remove fget_many and fput_many interface

2022-05-14T22:47:28+00:00

These two interface were added in 091141a42 commit,
but now there is no place to call them.

The only user of fput/fget_many() was removed in commit
62906e89e63b ("io_uring: remove file batch-get optimisation").

A user of get_file_rcu_many() were removed in commit
f073531070d2 ("init: add an init_dup helper").

And replace atomic_long_sub/add to atomic_long_dec/inc
can improve performance.

Here are the test results of unixbench:

Cmd: ./Run -c 64 context1

Without patch:
System Benchmarks Partial Index              BASELINE       RESULT    INDEX
Pipe-based Context Switching                   4000.0    2798407.0   6996.0
                                                                   ========
System Benchmarks Index Score (Partial Only)                         6996.0

With patch:
System Benchmarks Partial Index              BASELINE       RESULT    INDEX
Pipe-based Context Switching                   4000.0    3486268.8   8715.7
                                                                   ========
System Benchmarks Index Score (Partial Only)                         8715.7

Signed-off-by: Gou Hao 
Signed-off-by: Al Viro

file: Export receive_fd() to modules

2021-09-06T11:20:56+00:00

Export receive_fd() so that some modules can use
it to pass file descriptor between processes without
missing any security stuffs.

Signed-off-by: Xie Yongji 
Acked-by: Jason Wang 
Link: https://lore.kernel.org/r/20210831103634.33-4-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin

fs: split receive_fd_replace from __receive_fd

2021-04-16T04:13:04+00:00

receive_fd_replace shares almost no code with the general case, so split
it out.  Also remove the "Bump the sock usage counts" comment from
both copies, as that is now what __receive_sock actually does.

[AV: ... and make the only user of receive_fd_replace() choose between
it and receive_fd() according to what userland had passed to it in
flags]

Signed-off-by: Christoph Hellwig 
Signed-off-by: Al Viro