2005-04-16 15:20:36 -07:00
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2005-04-16 15:25:56 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-23 21:28:13 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-18 19:50:21 +08:00
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2005-04-16 15:20:36 -07:00
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2009-01-11 00:35:42 -08:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:59 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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random: add async notification support to /dev/random
Add async notification support to /dev/random.
A little test case is below. Without this patch, you get:
$ ./async-random
Drained the pool
Found more randomness
With it, you get:
$ ./async-random
Drained the pool
SIGIO
Found more randomness
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
static void handler(int sig)
{
printf("SIGIO\n");
}
int main(int argc, char **argv)
{
int fd, n, err, flags;
if(signal(SIGIO, handler) < 0){
perror("setting SIGIO handler");
exit(1);
}
fd = open("/dev/random", O_RDONLY);
if(fd < 0){
perror("open");
exit(1);
}
flags = fcntl(fd, F_GETFL);
if (flags < 0){
perror("getting flags");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
while((err = read(fd, &n, sizeof(n))) > 0) ;
if(err == 0){
printf("random returned 0\n");
exit(1);
}
else if(errno != EAGAIN){
perror("read");
exit(1);
}
flags |= O_ASYNC;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
if (fcntl(fd, F_SETOWN, getpid()) < 0) {
perror("Setting SIGIO");
exit(1);
}
printf("Drained the pool\n");
read(fd, &n, sizeof(n));
printf("Found more randomness\n");
return(0);
}
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 01:03:08 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:01 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:01 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-06 14:42:55 -08:00
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2005-04-16 15:20:36 -07:00
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2009-06-18 19:50:21 +08:00
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2005-04-16 15:20:36 -07:00
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2006-07-03 00:24:34 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-03 00:24:34 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-03 00:24:34 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:07 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:04 -07:00
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2008-04-29 01:03:02 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2008-04-29 01:03:03 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:04 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2008-04-29 01:03:04 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:04 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:04 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:02 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:04 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:04 -07:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:07 -07:00
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2005-04-16 15:20:36 -07:00
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2008-09-02 14:36:14 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:07 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:07 -07:00
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2008-09-02 14:36:14 -07:00
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2008-04-29 01:03:07 -07:00
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2008-09-02 14:36:14 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:56 -07:00
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2008-09-02 14:36:14 -07:00
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2008-04-29 01:02:56 -07:00
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random: add async notification support to /dev/random
Add async notification support to /dev/random.
A little test case is below. Without this patch, you get:
$ ./async-random
Drained the pool
Found more randomness
With it, you get:
$ ./async-random
Drained the pool
SIGIO
Found more randomness
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
static void handler(int sig)
{
printf("SIGIO\n");
}
int main(int argc, char **argv)
{
int fd, n, err, flags;
if(signal(SIGIO, handler) < 0){
perror("setting SIGIO handler");
exit(1);
}
fd = open("/dev/random", O_RDONLY);
if(fd < 0){
perror("open");
exit(1);
}
flags = fcntl(fd, F_GETFL);
if (flags < 0){
perror("getting flags");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
while((err = read(fd, &n, sizeof(n))) > 0) ;
if(err == 0){
printf("random returned 0\n");
exit(1);
}
else if(errno != EAGAIN){
perror("read");
exit(1);
}
flags |= O_ASYNC;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
if (fcntl(fd, F_SETOWN, getpid()) < 0) {
perror("Setting SIGIO");
exit(1);
}
printf("Drained the pool\n");
read(fd, &n, sizeof(n));
printf("Found more randomness\n");
return(0);
}
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 01:03:08 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-07 15:03:13 -08:00
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2009-01-03 00:06:34 -08:00
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2008-12-05 18:58:31 -08:00
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2008-08-19 20:50:08 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:07 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-11 12:17:38 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-11 01:43:58 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-19 20:50:08 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-19 20:50:08 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30 20:45:40 +02:00
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2005-04-16 15:20:36 -07:00
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2008-09-03 09:01:48 +02:00
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2005-04-16 15:20:36 -07:00
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2008-09-03 09:01:48 +02:00
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2005-04-16 15:20:36 -07:00
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|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30 20:45:40 +02:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-19 11:30:14 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-19 11:30:14 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2008-04-29 01:03:05 -07:00
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2008-04-29 01:03:07 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-06 14:42:55 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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random: add async notification support to /dev/random
Add async notification support to /dev/random.
A little test case is below. Without this patch, you get:
$ ./async-random
Drained the pool
Found more randomness
With it, you get:
$ ./async-random
Drained the pool
SIGIO
Found more randomness
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
static void handler(int sig)
{
printf("SIGIO\n");
}
int main(int argc, char **argv)
{
int fd, n, err, flags;
if(signal(SIGIO, handler) < 0){
perror("setting SIGIO handler");
exit(1);
}
fd = open("/dev/random", O_RDONLY);
if(fd < 0){
perror("open");
exit(1);
}
flags = fcntl(fd, F_GETFL);
if (flags < 0){
perror("getting flags");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
while((err = read(fd, &n, sizeof(n))) > 0) ;
if(err == 0){
printf("random returned 0\n");
exit(1);
}
else if(errno != EAGAIN){
perror("read");
exit(1);
}
flags |= O_ASYNC;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
if (fcntl(fd, F_SETOWN, getpid()) < 0) {
perror("Setting SIGIO");
exit(1);
}
printf("Drained the pool\n");
read(fd, &n, sizeof(n));
printf("Found more randomness\n");
return(0);
}
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 01:03:08 -07:00
|
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|
2005-04-16 15:20:36 -07:00
|
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|
|
random: add async notification support to /dev/random
Add async notification support to /dev/random.
A little test case is below. Without this patch, you get:
$ ./async-random
Drained the pool
Found more randomness
With it, you get:
$ ./async-random
Drained the pool
SIGIO
Found more randomness
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
static void handler(int sig)
{
printf("SIGIO\n");
}
int main(int argc, char **argv)
{
int fd, n, err, flags;
if(signal(SIGIO, handler) < 0){
perror("setting SIGIO handler");
exit(1);
}
fd = open("/dev/random", O_RDONLY);
if(fd < 0){
perror("open");
exit(1);
}
flags = fcntl(fd, F_GETFL);
if (flags < 0){
perror("getting flags");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
while((err = read(fd, &n, sizeof(n))) > 0) ;
if(err == 0){
printf("random returned 0\n");
exit(1);
}
else if(errno != EAGAIN){
perror("read");
exit(1);
}
flags |= O_ASYNC;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
if (fcntl(fd, F_SETOWN, getpid()) < 0) {
perror("Setting SIGIO");
exit(1);
}
printf("Drained the pool\n");
read(fd, &n, sizeof(n));
printf("Found more randomness\n");
return(0);
}
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 01:03:08 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-29 21:54:27 -05:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:00 -07:00
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2008-04-29 01:02:59 -07:00
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2008-04-29 01:03:00 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:00 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:00 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2008-04-29 01:02:59 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:00 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:59 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2009-06-18 19:50:21 +08:00
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2005-04-16 15:20:36 -07:00
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2009-06-18 19:50:21 +08:00
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2005-04-16 15:20:36 -07:00
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2007-03-28 14:22:33 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-28 14:22:33 -07:00
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2008-04-29 01:03:05 -07:00
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2009-06-18 19:50:21 +08:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:58 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-19 20:50:08 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-28 14:22:33 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-28 14:22:33 -07:00
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2008-08-19 20:50:08 -07:00
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2005-04-16 15:20:36 -07:00
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|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30 20:45:40 +02:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
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2007-03-28 14:22:33 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-28 14:22:33 -07:00
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|
2005-04-16 15:20:36 -07:00
|
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|
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|
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30 20:45:40 +02:00
|
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|
2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-29 21:58:10 -05:00
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2005-04-16 15:20:36 -07:00
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2007-05-29 21:58:10 -05:00
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2005-04-16 15:20:36 -07:00
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2007-05-29 21:58:10 -05:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:05 -07:00
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2008-02-06 01:37:20 -08:00
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2005-04-16 15:20:36 -07:00
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2007-05-29 21:58:10 -05:00
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2008-04-29 01:02:55 -07:00
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2007-05-29 21:58:10 -05:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:58 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:58 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-29 21:58:10 -05:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:03:07 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:58 -07:00
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2005-04-16 15:20:36 -07:00
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random: add async notification support to /dev/random
Add async notification support to /dev/random.
A little test case is below. Without this patch, you get:
$ ./async-random
Drained the pool
Found more randomness
With it, you get:
$ ./async-random
Drained the pool
SIGIO
Found more randomness
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
static void handler(int sig)
{
printf("SIGIO\n");
}
int main(int argc, char **argv)
{
int fd, n, err, flags;
if(signal(SIGIO, handler) < 0){
perror("setting SIGIO handler");
exit(1);
}
fd = open("/dev/random", O_RDONLY);
if(fd < 0){
perror("open");
exit(1);
}
flags = fcntl(fd, F_GETFL);
if (flags < 0){
perror("getting flags");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
while((err = read(fd, &n, sizeof(n))) > 0) ;
if(err == 0){
printf("random returned 0\n");
exit(1);
}
else if(errno != EAGAIN){
perror("read");
exit(1);
}
flags |= O_ASYNC;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
if (fcntl(fd, F_SETOWN, getpid()) < 0) {
perror("Setting SIGIO");
exit(1);
}
printf("Drained the pool\n");
read(fd, &n, sizeof(n));
printf("Found more randomness\n");
return(0);
}
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 01:03:08 -07:00
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2007-02-12 00:55:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:58 -07:00
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|
random: add async notification support to /dev/random
Add async notification support to /dev/random.
A little test case is below. Without this patch, you get:
$ ./async-random
Drained the pool
Found more randomness
With it, you get:
$ ./async-random
Drained the pool
SIGIO
Found more randomness
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
static void handler(int sig)
{
printf("SIGIO\n");
}
int main(int argc, char **argv)
{
int fd, n, err, flags;
if(signal(SIGIO, handler) < 0){
perror("setting SIGIO handler");
exit(1);
}
fd = open("/dev/random", O_RDONLY);
if(fd < 0){
perror("open");
exit(1);
}
flags = fcntl(fd, F_GETFL);
if (flags < 0){
perror("getting flags");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
while((err = read(fd, &n, sizeof(n))) > 0) ;
if(err == 0){
printf("random returned 0\n");
exit(1);
}
else if(errno != EAGAIN){
perror("read");
exit(1);
}
flags |= O_ASYNC;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
if (fcntl(fd, F_SETOWN, getpid()) < 0) {
perror("Setting SIGIO");
exit(1);
}
printf("Drained the pool\n");
read(fd, &n, sizeof(n));
printf("Found more randomness\n");
return(0);
}
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 01:03:08 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:55:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:58 -07:00
|
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|
|
random: add async notification support to /dev/random
Add async notification support to /dev/random.
A little test case is below. Without this patch, you get:
$ ./async-random
Drained the pool
Found more randomness
With it, you get:
$ ./async-random
Drained the pool
SIGIO
Found more randomness
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
static void handler(int sig)
{
printf("SIGIO\n");
}
int main(int argc, char **argv)
{
int fd, n, err, flags;
if(signal(SIGIO, handler) < 0){
perror("setting SIGIO handler");
exit(1);
}
fd = open("/dev/random", O_RDONLY);
if(fd < 0){
perror("open");
exit(1);
}
flags = fcntl(fd, F_GETFL);
if (flags < 0){
perror("getting flags");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
while((err = read(fd, &n, sizeof(n))) > 0) ;
if(err == 0){
printf("random returned 0\n");
exit(1);
}
else if(errno != EAGAIN){
perror("read");
exit(1);
}
flags |= O_ASYNC;
if (fcntl(fd, F_SETFL, flags) < 0){
perror("setting flags");
exit(1);
}
if (fcntl(fd, F_SETOWN, getpid()) < 0) {
perror("Setting SIGIO");
exit(1);
}
printf("Drained the pool\n");
read(fd, &n, sizeof(n));
printf("Found more randomness\n");
return(0);
}
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 01:03:08 -07:00
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2005-04-16 15:20:36 -07:00
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2009-09-23 15:57:19 -07:00
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2005-04-16 15:20:36 -07:00
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2009-09-23 15:57:19 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-15 22:04:23 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 02:19:10 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-22 14:55:48 +00:00
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2005-04-16 15:20:36 -07:00
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2006-11-22 14:55:48 +00:00
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2005-04-16 15:20:36 -07:00
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2006-11-22 14:55:48 +00:00
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2005-04-16 15:20:36 -07:00
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2009-04-02 16:56:39 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2007-11-13 21:12:14 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-01 13:58:36 -07:00
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2005-04-16 15:20:36 -07:00
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2007-11-13 21:12:14 -08:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2005-12-13 23:25:31 -08:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2008-08-18 21:32:32 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2008-04-29 01:02:55 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 20:52:19 -08:00
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2005-04-16 15:20:36 -07:00
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2005-08-09 20:12:30 -07:00
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2006-11-14 20:52:19 -08:00
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2005-08-09 20:12:30 -07:00
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2006-11-14 20:52:19 -08:00
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2005-08-09 20:12:30 -07:00
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2007-11-13 21:12:14 -08:00
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2005-08-09 20:12:30 -07:00
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2008-04-29 01:02:55 -07:00
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2005-08-09 20:12:30 -07:00
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2005-04-16 15:20:36 -07:00
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random: make get_random_int() more random
It's a really simple patch that basically just open-codes the current
"secure_ip_id()" call, but when open-coding it we now use a _static_
hashing area, so that it gets updated every time.
And to make sure somebody can't just start from the same original seed of
all-zeroes, and then do the "half_md4_transform()" over and over until
they get the same sequence as the kernel has, each iteration also mixes in
the same old "current->pid + jiffies" we used - so we should now have a
regular strong pseudo-number generator, but we also have one that doesn't
have a single seed.
Note: the "pid + jiffies" is just meant to be a tiny tiny bit of noise. It
has no real meaning. It could be anything. I just picked the previous
seed, it's just that now we keep the state in between calls and that will
feed into the next result, and that should make all the difference.
I made that hash be a per-cpu data just to avoid cache-line ping-pong:
having multiple CPU's write to the same data would be fine for randomness,
and add yet another layer of chaos to it, but since get_random_int() is
supposed to be a fast interface I did it that way instead. I considered
using "__raw_get_cpu_var()" to avoid any preemption overhead while still
getting the hash be _mostly_ ping-pong free, but in the end good taste won
out.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-05-05 08:17:43 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
random: make get_random_int() more random
It's a really simple patch that basically just open-codes the current
"secure_ip_id()" call, but when open-coding it we now use a _static_
hashing area, so that it gets updated every time.
And to make sure somebody can't just start from the same original seed of
all-zeroes, and then do the "half_md4_transform()" over and over until
they get the same sequence as the kernel has, each iteration also mixes in
the same old "current->pid + jiffies" we used - so we should now have a
regular strong pseudo-number generator, but we also have one that doesn't
have a single seed.
Note: the "pid + jiffies" is just meant to be a tiny tiny bit of noise. It
has no real meaning. It could be anything. I just picked the previous
seed, it's just that now we keep the state in between calls and that will
feed into the next result, and that should make all the difference.
I made that hash be a per-cpu data just to avoid cache-line ping-pong:
having multiple CPU's write to the same data would be fine for randomness,
and add yet another layer of chaos to it, but since get_random_int() is
supposed to be a fast interface I did it that way instead. I considered
using "__raw_get_cpu_var()" to avoid any preemption overhead while still
getting the hash be _mostly_ ping-pong free, but in the end good taste won
out.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-05-05 08:17:43 -07:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2009-05-19 11:25:35 -07:00
|
|
|
|
random: make get_random_int() more random
It's a really simple patch that basically just open-codes the current
"secure_ip_id()" call, but when open-coding it we now use a _static_
hashing area, so that it gets updated every time.
And to make sure somebody can't just start from the same original seed of
all-zeroes, and then do the "half_md4_transform()" over and over until
they get the same sequence as the kernel has, each iteration also mixes in
the same old "current->pid + jiffies" we used - so we should now have a
regular strong pseudo-number generator, but we also have one that doesn't
have a single seed.
Note: the "pid + jiffies" is just meant to be a tiny tiny bit of noise. It
has no real meaning. It could be anything. I just picked the previous
seed, it's just that now we keep the state in between calls and that will
feed into the next result, and that should make all the difference.
I made that hash be a per-cpu data just to avoid cache-line ping-pong:
having multiple CPU's write to the same data would be fine for randomness,
and add yet another layer of chaos to it, but since get_random_int() is
supposed to be a fast interface I did it that way instead. I considered
using "__raw_get_cpu_var()" to avoid any preemption overhead while still
getting the hash be _mostly_ ping-pong free, but in the end good taste won
out.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-05-05 08:17:43 -07:00
|
|
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|
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|
|
2005-04-16 15:20:36 -07:00
|
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