updates
diff --git a/0001-Revert-zram-convert-remaining-CLASS_ATTR-to-CLASS_AT.patch b/0001-Revert-zram-convert-remaining-CLASS_ATTR-to-CLASS_AT.patch
new file mode 100644
index 0000000..585456a
--- /dev/null
+++ b/0001-Revert-zram-convert-remaining-CLASS_ATTR-to-CLASS_AT.patch
@@ -0,0 +1,30 @@
+From dc2440d69ee81aff9c56ec8ded0fd37b7b344130 Mon Sep 17 00:00:00 2001
+From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Date: Wed, 17 Jun 2020 12:28:23 +0200
+Subject: [PATCH] Revert "zram: convert remaining CLASS_ATTR() to
+ CLASS_ATTR_RO()"
+
+Turns out that the permissions for 0400 really are what we want here,
+otherwise any user can write to this file.
+
+Reported-by: Wade Mealing <wmealing@redhat.com>
+Cc: stable <stable@vger.kernel.org>
+Fixes: f40609d1591f ("zram: convert remaining CLASS_ATTR() to CLASS_ATTR_RO()")
+Link: https://bugzilla.redhat.com/show_bug.cgi?id=1847832
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/block/zram/zram_drv.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/drivers/block/zram/zram_drv.c
++++ b/drivers/block/zram/zram_drv.c
+@@ -2021,7 +2021,8 @@ static ssize_t hot_add_show(struct class
+ return ret;
+ return scnprintf(buf, PAGE_SIZE, "%d\n", ret);
+ }
+-static CLASS_ATTR_RO(hot_add);
++static struct class_attribute class_attr_hot_add =
++ __ATTR(hot_add, 0400, hot_add_show, NULL);
+
+ static ssize_t hot_remove_store(struct class *class,
+ struct class_attribute *attr,
diff --git a/0001-readfile-implement-readfile-syscall.patch b/0001-readfile-implement-readfile-syscall.patch
index 1393312..0e0e065 100644
--- a/0001-readfile-implement-readfile-syscall.patch
+++ b/0001-readfile-implement-readfile-syscall.patch
@@ -1,7 +1,7 @@
-From 64793c95677d62753de4db132b0c85adab7aa9ab Mon Sep 17 00:00:00 2001
+From 654540d453a03efc0fe7fc0e0d155981051b10c4 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Sun, 24 May 2020 12:37:15 +0200
-Subject: [PATCH 1/3] readfile: implement readfile syscall
+Subject: [PATCH 1/4] readfile: implement readfile syscall
It's a tiny syscall, meant to allow a user to do a single "open this
file, read into this buffer, and close the file" all in a single shot.
@@ -15,14 +15,12 @@
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
- fs/open.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
+ fs/open.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
-diff --git a/fs/open.c b/fs/open.c
-index 6cd48a61cda3..9ec18cddee18 100644
--- a/fs/open.c
+++ b/fs/open.c
-@@ -1370,3 +1370,53 @@ int stream_open(struct inode *inode, struct file *filp)
+@@ -1370,3 +1370,53 @@ int stream_open(struct inode *inode, str
}
EXPORT_SYMBOL(stream_open);
@@ -76,6 +74,3 @@
+
+ return retval;
+}
---
-2.27.0
-
diff --git a/0002-arch-wire-up-the-readfile-syscall.patch b/0002-arch-wire-up-the-readfile-syscall.patch
index 34e76f3..027af34 100644
--- a/0002-arch-wire-up-the-readfile-syscall.patch
+++ b/0002-arch-wire-up-the-readfile-syscall.patch
@@ -1,36 +1,34 @@
-From ef5dc99f43ca5c982c124ff6ac7acf0c1151d5bf Mon Sep 17 00:00:00 2001
+From 4135ebc2076a72c3ad10d0102e8ebc82140abf8d Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Sun, 24 May 2020 12:36:21 +0200
-Subject: [PATCH 2/3] arch: wire up the readfile syscall
+Subject: [PATCH 2/4] arch: wire up the readfile syscall
This wires up the readfile syscall for all architectures
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
- arch/alpha/kernel/syscalls/syscall.tbl | 1 +
- arch/arm/tools/syscall.tbl | 1 +
- arch/arm64/include/asm/unistd.h | 2 +-
- arch/arm64/include/asm/unistd32.h | 2 ++
- arch/ia64/kernel/syscalls/syscall.tbl | 1 +
- arch/m68k/kernel/syscalls/syscall.tbl | 1 +
- arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
- arch/mips/kernel/syscalls/syscall_n32.tbl | 1 +
- arch/mips/kernel/syscalls/syscall_n64.tbl | 1 +
- arch/mips/kernel/syscalls/syscall_o32.tbl | 1 +
- arch/parisc/kernel/syscalls/syscall.tbl | 1 +
- arch/powerpc/kernel/syscalls/syscall.tbl | 1 +
- arch/s390/kernel/syscalls/syscall.tbl | 1 +
- arch/sh/kernel/syscalls/syscall.tbl | 1 +
- arch/sparc/kernel/syscalls/syscall.tbl | 1 +
- arch/x86/entry/syscalls/syscall_32.tbl | 1 +
- arch/x86/entry/syscalls/syscall_64.tbl | 1 +
- arch/xtensa/kernel/syscalls/syscall.tbl | 1 +
- include/linux/syscalls.h | 2 ++
- include/uapi/asm-generic/unistd.h | 4 +++-
+ arch/alpha/kernel/syscalls/syscall.tbl | 1 +
+ arch/arm/tools/syscall.tbl | 1 +
+ arch/arm64/include/asm/unistd.h | 2 +-
+ arch/arm64/include/asm/unistd32.h | 2 ++
+ arch/ia64/kernel/syscalls/syscall.tbl | 1 +
+ arch/m68k/kernel/syscalls/syscall.tbl | 1 +
+ arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
+ arch/mips/kernel/syscalls/syscall_n32.tbl | 1 +
+ arch/mips/kernel/syscalls/syscall_n64.tbl | 1 +
+ arch/mips/kernel/syscalls/syscall_o32.tbl | 1 +
+ arch/parisc/kernel/syscalls/syscall.tbl | 1 +
+ arch/powerpc/kernel/syscalls/syscall.tbl | 1 +
+ arch/s390/kernel/syscalls/syscall.tbl | 1 +
+ arch/sh/kernel/syscalls/syscall.tbl | 1 +
+ arch/sparc/kernel/syscalls/syscall.tbl | 1 +
+ arch/x86/entry/syscalls/syscall_32.tbl | 1 +
+ arch/x86/entry/syscalls/syscall_64.tbl | 1 +
+ arch/xtensa/kernel/syscalls/syscall.tbl | 1 +
+ include/linux/syscalls.h | 2 ++
+ include/uapi/asm-generic/unistd.h | 4 +++-
20 files changed, 24 insertions(+), 2 deletions(-)
-diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
-index 5ddd128d4b7a..4132380e997f 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -478,3 +478,4 @@
@@ -38,8 +36,6 @@
548 common pidfd_getfd sys_pidfd_getfd
549 common faccessat2 sys_faccessat2
+550 common readfile sys_readfile
-diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
-index d5cae5ffede0..454873892ba3 100644
--- a/arch/arm/tools/syscall.tbl
+++ b/arch/arm/tools/syscall.tbl
@@ -452,3 +452,4 @@
@@ -47,8 +43,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
-index 3b859596840d..b3b2019f8d16 100644
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -38,7 +38,7 @@
@@ -60,8 +54,6 @@
#endif
#define __ARCH_WANT_SYS_CLONE
-diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
-index 6d95d0c8bf2f..524d19779612 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -885,6 +885,8 @@ __SYSCALL(__NR_openat2, sys_openat2)
@@ -73,8 +65,6 @@
/*
* Please add new compat syscalls above this comment and update
-diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
-index 49e325b604b3..b188f03736bb 100644
--- a/arch/ia64/kernel/syscalls/syscall.tbl
+++ b/arch/ia64/kernel/syscalls/syscall.tbl
@@ -359,3 +359,4 @@
@@ -82,8 +72,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
-index f71b1bbcc198..ab24bcb91344 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -438,3 +438,4 @@
@@ -91,8 +79,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
-index edacc4561f2b..46c06f800e8e 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -444,3 +444,4 @@
@@ -100,8 +86,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
-index f777141f5256..552ba4dafbef 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -377,3 +377,4 @@
@@ -109,8 +93,6 @@
438 n32 pidfd_getfd sys_pidfd_getfd
439 n32 faccessat2 sys_faccessat2
+440 n32 readfile sys_readfile
-diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
-index da8c76394e17..e12581bf900b 100644
--- a/arch/mips/kernel/syscalls/syscall_n64.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
@@ -353,3 +353,4 @@
@@ -118,8 +100,6 @@
438 n64 pidfd_getfd sys_pidfd_getfd
439 n64 faccessat2 sys_faccessat2
+440 n64 readfile sys_readfile
-diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
-index 13280625d312..67cb8f8fbdb2 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -426,3 +426,4 @@
@@ -127,8 +107,6 @@
438 o32 pidfd_getfd sys_pidfd_getfd
439 o32 faccessat2 sys_faccessat2
+440 o32 readfile sys_readfile
-diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
-index 5a758fa6ec52..775e5228ab51 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -436,3 +436,4 @@
@@ -136,8 +114,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
-index f833a3190822..d452db708635 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -528,3 +528,4 @@
@@ -145,8 +121,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
-index bfdcb7633957..7ab529813a42 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -441,3 +441,4 @@
@@ -154,8 +128,6 @@
438 common pidfd_getfd sys_pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2 sys_faccessat2
+440 common readfile sys_readfile sys_readfile
-diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
-index acc35daa1b79..ce8862cdb707 100644
--- a/arch/sh/kernel/syscalls/syscall.tbl
+++ b/arch/sh/kernel/syscalls/syscall.tbl
@@ -441,3 +441,4 @@
@@ -163,8 +135,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
-index 8004a276cb74..d89e7224bb0f 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -484,3 +484,4 @@
@@ -172,8 +142,6 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
-index d8f8a1a69ed1..6f8d0b0acb6a 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -443,3 +443,4 @@
@@ -181,8 +149,6 @@
438 i386 pidfd_getfd sys_pidfd_getfd
439 i386 faccessat2 sys_faccessat2
+440 i386 readfile sys_readfile
-diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
-index 78847b32e137..9c54081b7c14 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -360,6 +360,7 @@
@@ -193,8 +159,6 @@
#
# x32-specific system call numbers start at 512 to avoid cache impact
-diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
-index 69d0d73876b3..7b1f2ea76621 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -409,3 +409,4 @@
@@ -202,11 +166,9 @@
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
+440 common readfile sys_readfile
-diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
-index 7c354c2955f5..b5cb9425c0f4 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
-@@ -1005,6 +1005,8 @@ asmlinkage long sys_pidfd_send_signal(int pidfd, int sig,
+@@ -1005,6 +1005,8 @@ asmlinkage long sys_pidfd_send_signal(in
siginfo_t __user *info,
unsigned int flags);
asmlinkage long sys_pidfd_getfd(int pidfd, int fd, unsigned int flags);
@@ -215,8 +177,6 @@
/*
* Architecture-specific system calls
-diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
-index f4a01305d9a6..81b677c01266 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -857,9 +857,11 @@ __SYSCALL(__NR_openat2, sys_openat2)
@@ -232,6 +192,3 @@
/*
* 32 bit systems traditionally used different
---
-2.27.0
-
diff --git a/0003-selftests-add-readfile-2-selftests.patch b/0003-selftests-add-readfile-2-selftests.patch
index c3a4054..8b9280a 100644
--- a/0003-selftests-add-readfile-2-selftests.patch
+++ b/0003-selftests-add-readfile-2-selftests.patch
@@ -1,7 +1,7 @@
-From 2a133d8e0cb79bc7566c39aae1191a7118a1202e Mon Sep 17 00:00:00 2001
+From 8928abbad99c7d3750695998e5fa7ba144da3300 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Sun, 8 Mar 2020 09:54:45 +0100
-Subject: [PATCH 3/3] selftests: add readfile(2) selftests
+Subject: [PATCH 3/4] selftests: add readfile(2) selftests
Test the functionality of readfile(2) in various ways.
@@ -10,19 +10,17 @@
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
- tools/testing/selftests/Makefile | 1 +
- tools/testing/selftests/readfile/.gitignore | 3 +
- tools/testing/selftests/readfile/Makefile | 7 +
- tools/testing/selftests/readfile/readfile.c | 285 ++++++++++++++++++
- .../selftests/readfile/readfile_speed.c | 221 ++++++++++++++
+ tools/testing/selftests/Makefile | 1
+ tools/testing/selftests/readfile/.gitignore | 3
+ tools/testing/selftests/readfile/Makefile | 7
+ tools/testing/selftests/readfile/readfile.c | 285 ++++++++++++++++++++++
+ tools/testing/selftests/readfile/readfile_speed.c | 221 +++++++++++++++++
5 files changed, 517 insertions(+)
create mode 100644 tools/testing/selftests/readfile/.gitignore
create mode 100644 tools/testing/selftests/readfile/Makefile
create mode 100644 tools/testing/selftests/readfile/readfile.c
create mode 100644 tools/testing/selftests/readfile/readfile_speed.c
-diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
-index 1195bd85af38..82359233b945 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -46,6 +46,7 @@ TARGETS += ptrace
@@ -33,18 +31,12 @@
TARGETS += seccomp
TARGETS += sigaltstack
TARGETS += size
-diff --git a/tools/testing/selftests/readfile/.gitignore b/tools/testing/selftests/readfile/.gitignore
-new file mode 100644
-index 000000000000..f0e758d437e4
--- /dev/null
+++ b/tools/testing/selftests/readfile/.gitignore
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+readfile
+readfile_speed
-diff --git a/tools/testing/selftests/readfile/Makefile b/tools/testing/selftests/readfile/Makefile
-new file mode 100644
-index 000000000000..1bf1bdec40f8
--- /dev/null
+++ b/tools/testing/selftests/readfile/Makefile
@@ -0,0 +1,7 @@
@@ -55,9 +47,6 @@
+TEST_GEN_PROGS := readfile readfile_speed
+
+include ../lib.mk
-diff --git a/tools/testing/selftests/readfile/readfile.c b/tools/testing/selftests/readfile/readfile.c
-new file mode 100644
-index 000000000000..f0736c6dfa69
--- /dev/null
+++ b/tools/testing/selftests/readfile/readfile.c
@@ -0,0 +1,285 @@
@@ -346,9 +335,6 @@
+ return ksft_exit_pass();
+}
+
-diff --git a/tools/testing/selftests/readfile/readfile_speed.c b/tools/testing/selftests/readfile/readfile_speed.c
-new file mode 100644
-index 000000000000..bbf985b30d1b
--- /dev/null
+++ b/tools/testing/selftests/readfile/readfile_speed.c
@@ -0,0 +1,221 @@
@@ -573,6 +559,3 @@
+
+ return retval;
+}
---
-2.27.0
-
diff --git a/0004-readfile.2.patch b/0004-readfile.2.patch
new file mode 100644
index 0000000..be3b579
--- /dev/null
+++ b/0004-readfile.2.patch
@@ -0,0 +1,242 @@
+From 1dcacd2cfdce9695c9e66e21d6ec0292d66da400 Mon Sep 17 00:00:00 2001
+From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Date: Fri, 12 Jun 2020 12:11:39 +0200
+Subject: [PATCH 4/4] readfile.2
+
+---
+ readfile.2 | 229 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 229 insertions(+)
+ create mode 100644 readfile.2
+
+--- /dev/null
++++ b/readfile.2
+@@ -0,0 +1,229 @@
++.\" This manpage is Copyright (C) 2020 Greg Kroah-Hartman;
++.\" and Copyright (C) 2020 The Linux Foundation
++.\"
++.\" %%%LICENSE_START(VERBATIM)
++.\" Permission is granted to make and distribute verbatim copies of this
++.\" manual provided the copyright notice and this permission notice are
++.\" preserved on all copies.
++.\"
++.\" Permission is granted to copy and distribute modified versions of this
++.\" manual under the conditions for verbatim copying, provided that the
++.\" entire resulting derived work is distributed under the terms of a
++.\" permission notice identical to this one.
++.\"
++.\" Since the Linux kernel and libraries are constantly changing, this
++.\" manual page may be incorrect or out-of-date. The author(s) assume no
++.\" responsibility for errors or omissions, or for damages resulting from
++.\" the use of the information contained herein. The author(s) may not
++.\" have taken the same level of care in the production of this manual,
++.\" which is licensed free of charge, as they might when working
++.\" professionally.
++.\"
++.\" Formatted or processed versions of this manual, if unaccompanied by
++.\" the source, must acknowledge the copyright and authors of this work.
++.\" %%%LICENSE_END
++.\"
++.TH READFILE 2 2020-06-12 "Linux" "Linux Programmer's Manual"
++.SH NAME
++readfile \- read a file into a buffer
++.SH SYNOPSIS
++.nf
++.B #include <unistd.h>
++.PP
++.BI "ssize_t readfile(int " dirfd ", const char *" pathname ", void *" buf \
++", size_t " count ", int " flags );
++.fi
++.SH DESCRIPTION
++.BR readfile ()
++attempts to open the file specified by
++.IR pathname
++and to read up to
++.I count
++bytes from the file into the buffer starting at
++.IR buf .
++It is to be a shortcut of doing the sequence of
++.BR open ()
++and then
++.BR read ()
++and then
++.BR close ()
++for small files that are read frequently, such as those in
++.B procfs
++or
++.BR sysfs .
++.PP
++If the size of file is smaller than the value provided in
++.I count
++then the whole file will be copied into
++.IR buf .
++.PP
++If the file is larger than the value provided in
++.I count
++then only
++.I count
++number of bytes will be copied into
++.IR buf .
++.PP
++The argument
++.I flags
++may contain one of the following
++.IR "access modes" :
++.BR O_NOFOLLOW ", or " O_NOATIME .
++.PP
++If the pathname given in
++.I pathname
++is relative, then it is interpreted relative to the directory
++referred to by the file descriptor
++.IR dirfd .
++.PP
++If
++.I pathname
++is relative and
++.I dirfd
++is the special value
++.BR AT_FDCWD ,
++then
++.I pathname
++is interpreted relative to the current working
++directory of the calling process (like
++.BR open ()).
++.PP
++If
++.I pathname
++is absolute, then
++.I dirfd
++is ignored.
++.SH RETURN VALUE
++On success, the number of bytes read is returned.
++It is not an error if this number is smaller than the number of bytes
++requested; this can happen if the file is smaller than the number of
++bytes requested.
++.PP
++On error, \-1 is returned, and
++.I errno
++is set appropriately.
++.SH ERRORS
++.TP
++.B EAGAIN
++The file descriptor
++.I fd
++refers to a file other than a socket and has been marked nonblocking
++.RB ( O_NONBLOCK ),
++and the read would block.
++See
++.BR open (2)
++for further details on the
++.BR O_NONBLOCK
++flag.
++.TP
++.BR EAGAIN " or " EWOULDBLOCK
++.\" Actually EAGAIN on Linux
++The file descriptor
++.I fd
++refers to a socket and has been marked nonblocking
++.RB ( O_NONBLOCK ),
++and the read would block.
++POSIX.1-2001 allows either error to be returned for this case,
++and does not require these constants to have the same value,
++so a portable application should check for both possibilities.
++.TP
++.B EBADF
++.I fd
++is not a valid file descriptor or is not open for reading.
++.TP
++.B EFAULT
++.I buf
++is outside your accessible address space.
++.TP
++.B EINTR
++The call was interrupted by a signal before any data was read; see
++.BR signal (7).
++.TP
++.B EINVAL
++.I fd
++is attached to an object which is unsuitable for reading;
++or the file was opened with the
++.B O_DIRECT
++flag, and either the address specified in
++.IR buf ,
++the value specified in
++.IR count ,
++or the file offset is not suitably aligned.
++.TP
++.B EINVAL
++.I fd
++was created via a call to
++.BR timerfd_create (2)
++and the wrong size buffer was given to
++.BR read ();
++see
++.BR timerfd_create (2)
++for further information.
++.TP
++.B EIO
++I/O error.
++This will happen for example when the process is in a
++background process group, tries to read from its controlling terminal,
++and either it is ignoring or blocking
++.B SIGTTIN
++or its process group
++is orphaned.
++It may also occur when there is a low-level I/O error
++while reading from a disk or tape.
++A further possible cause of
++.B EIO
++on networked filesystems is when an advisory lock had been taken
++out on the file descriptor and this lock has been lost.
++See the
++.I "Lost locks"
++section of
++.BR fcntl (2)
++for further details.
++.TP
++.B EISDIR
++.I fd
++refers to a directory.
++.PP
++Other errors may occur, depending on the object connected to
++.IR fd .
++.SH CONFORMING TO
++SVr4, 4.3BSD, POSIX.1-2001.
++.SH NOTES
++The types
++.I size_t
++and
++.I ssize_t
++are, respectively,
++unsigned and signed integer data types specified by POSIX.1.
++.PP
++On Linux,
++.BR read ()
++(and similar system calls) will transfer at most
++0x7ffff000 (2,147,479,552) bytes,
++returning the number of bytes actually transferred.
++.\" commit e28cc71572da38a5a12c1cfe4d7032017adccf69
++(This is true on both 32-bit and 64-bit systems.)
++.PP
++On NFS filesystems, reading small amounts of data will update the
++timestamp only the first time, subsequent calls may not do so.
++This is caused
++by client side attribute caching, because most if not all NFS clients
++leave
++.I st_atime
++(last file access time)
++updates to the server, and client side reads satisfied from the
++client's cache will not cause
++.I st_atime
++updates on the server as there are no
++server-side reads.
++UNIX semantics can be obtained by disabling client-side attribute caching,
++but in most situations this will substantially
++increase server load and decrease performance.
++.SH BUGS
++None yet!
++.SH SEE ALSO
++.BR close (2),
++.BR open (2),
++.BR openat (2),
++.BR read (2),
++.BR fread (3)
diff --git a/series b/series
index b8f0b8c..b6335da 100644
--- a/series
+++ b/series
@@ -1,7 +1,9 @@
#
+0001-Revert-zram-convert-remaining-CLASS_ATTR-to-CLASS_AT.patch
0001-readfile-implement-readfile-syscall.patch
0002-arch-wire-up-the-readfile-syscall.patch
0003-selftests-add-readfile-2-selftests.patch
+0004-readfile.2.patch
spdxcheck-print-out-files-without-any-spdx-lines.patch
0001-tty-n_r3964-locking-fixups.patch
