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// SPDX-License-Identifier: GPL-2.0-only
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# include <linux/module.h>
# include <linux/sched.h>
# include <linux/ctype.h>
# include <linux/fd.h>
# include <linux/tty.h>
# include <linux/suspend.h>
# include <linux/root_dev.h>
# include <linux/security.h>
# include <linux/delay.h>
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# include <linux/genhd.h>
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# include <linux/mount.h>
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# include <linux/device.h>
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# include <linux/init.h>
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# include <linux/fs.h>
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# include <linux/initrd.h>
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# include <linux/async.h>
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# include <linux/fs_struct.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
# include <linux/slab.h>
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# include <linux/ramfs.h>
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# include <linux/shmem_fs.h>
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# include <linux/nfs_fs.h>
# include <linux/nfs_fs_sb.h>
# include <linux/nfs_mount.h>
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# include <linux/raid/detect.h>
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# include <uapi/linux/mount.h>
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# include "do_mounts.h"
[PATCH] vfs: MS_VERBOSE should be MS_SILENT
The meaning of MS_VERBOSE is backwards; if the bit is set, it really means,
"don't be verbose". This is confusing and counter-intuitive.
In addition, there is also no way to set the MS_VERBOSE flag in the
mount(8) program in util-linux, but interesting, it does define options
which would do the right thing if MS_SILENT were defined, which
unfortunately we do not:
#ifdef MS_SILENT
{ "quiet", 0, 0, MS_SILENT }, /* be quiet */
{ "loud", 0, 1, MS_SILENT }, /* print out messages. */
#endif
So the obvious fix is to deprecate the use of MS_VERBOSE and replace it
with MS_SILENT.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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int root_mountflags = MS_RDONLY | MS_SILENT ;
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static char * __initdata root_device_name ;
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static char __initdata saved_root_name [ 64 ] ;
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static int root_wait ;
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dev_t ROOT_DEV ;
static int __init load_ramdisk ( char * str )
{
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pr_warn ( " ignoring the deprecated load_ramdisk= option \n " ) ;
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return 1 ;
}
__setup ( " load_ramdisk= " , load_ramdisk ) ;
static int __init readonly ( char * str )
{
if ( * str )
return 0 ;
root_mountflags | = MS_RDONLY ;
return 1 ;
}
static int __init readwrite ( char * str )
{
if ( * str )
return 0 ;
root_mountflags & = ~ MS_RDONLY ;
return 1 ;
}
__setup ( " ro " , readonly ) ;
__setup ( " rw " , readwrite ) ;
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# ifdef CONFIG_BLOCK
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struct uuidcmp {
const char * uuid ;
int len ;
} ;
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/**
* match_dev_by_uuid - callback for finding a partition using its uuid
* @ dev : device passed in by the caller
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* @ data : opaque pointer to the desired struct uuidcmp to match
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*
* Returns 1 if the device matches , and 0 otherwise .
*/
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static int match_dev_by_uuid ( struct device * dev , const void * data )
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{
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const struct uuidcmp * cmp = data ;
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struct hd_struct * part = dev_to_part ( dev ) ;
if ( ! part - > info )
goto no_match ;
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if ( strncasecmp ( cmp - > uuid , part - > info - > uuid , cmp - > len ) )
goto no_match ;
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return 1 ;
no_match :
return 0 ;
}
/**
* devt_from_partuuid - looks up the dev_t of a partition by its UUID
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* @ uuid_str : char array containing ascii UUID
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*
* The function will return the first partition which contains a matching
* UUID value in its partition_meta_info struct . This does not search
* by filesystem UUIDs .
*
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* If @ uuid_str is followed by a " /PARTNROFF=%d " , then the number will be
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* extracted and used as an offset from the partition identified by the UUID .
*
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* Returns the matching dev_t on success or 0 on failure .
*/
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static dev_t devt_from_partuuid ( const char * uuid_str )
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{
dev_t res = 0 ;
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struct uuidcmp cmp ;
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struct device * dev = NULL ;
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struct gendisk * disk ;
struct hd_struct * part ;
int offset = 0 ;
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bool clear_root_wait = false ;
char * slash ;
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cmp . uuid = uuid_str ;
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slash = strchr ( uuid_str , ' / ' ) ;
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/* Check for optional partition number offset attributes. */
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if ( slash ) {
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char c = 0 ;
/* Explicitly fail on poor PARTUUID syntax. */
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if ( sscanf ( slash + 1 ,
" PARTNROFF=%d%c " , & offset , & c ) ! = 1 ) {
clear_root_wait = true ;
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goto done ;
}
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cmp . len = slash - uuid_str ;
} else {
cmp . len = strlen ( uuid_str ) ;
}
if ( ! cmp . len ) {
clear_root_wait = true ;
goto done ;
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}
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dev = class_find_device ( & block_class , NULL , & cmp ,
& match_dev_by_uuid ) ;
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if ( ! dev )
goto done ;
res = dev - > devt ;
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/* Attempt to find the partition by offset. */
if ( ! offset )
goto no_offset ;
res = 0 ;
disk = part_to_disk ( dev_to_part ( dev ) ) ;
part = disk_get_part ( disk , dev_to_part ( dev ) - > partno + offset ) ;
if ( part ) {
res = part_devt ( part ) ;
put_device ( part_to_dev ( part ) ) ;
}
no_offset :
put_device ( dev ) ;
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done :
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if ( clear_root_wait ) {
pr_err ( " VFS: PARTUUID= is invalid. \n "
" Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d] \n " ) ;
if ( root_wait )
pr_err ( " Disabling rootwait; root= is invalid. \n " ) ;
root_wait = 0 ;
}
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return res ;
}
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/**
* match_dev_by_label - callback for finding a partition using its label
* @ dev : device passed in by the caller
* @ data : opaque pointer to the label to match
*
* Returns 1 if the device matches , and 0 otherwise .
*/
static int match_dev_by_label ( struct device * dev , const void * data )
{
const char * label = data ;
struct hd_struct * part = dev_to_part ( dev ) ;
if ( part - > info & & ! strcmp ( label , part - > info - > volname ) )
return 1 ;
return 0 ;
}
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# endif
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/*
* Convert a name into device number . We accept the following variants :
*
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* 1 ) < hex_major > < hex_minor > device number in hexadecimal represents itself
* no leading 0 x , for example b302 .
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* 2 ) / dev / nfs represents Root_NFS ( 0xff )
* 3 ) / dev / < disk_name > represents the device number of disk
* 4 ) / dev / < disk_name > < decimal > represents the device number
* of partition - device number of disk plus the partition number
* 5 ) / dev / < disk_name > p < decimal > - same as the above , that form is
* used when disk name of partitioned disk ends on a digit .
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* 6 ) PARTUUID = 00112233 - 4455 - 6677 - 8899 - AABBCCDDEEFF representing the
* unique id of a partition if the partition table provides it .
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* The UUID may be either an EFI / GPT UUID , or refer to an MSDOS
* partition using the format SSSSSSSS - PP , where SSSSSSSS is a zero -
* filled hex representation of the 32 - bit " NT disk signature " , and PP
* is a zero - filled hex representation of the 1 - based partition number .
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* 7 ) PARTUUID = < UUID > / PARTNROFF = < int > to select a partition in relation to
* a partition with a known unique id .
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* 8 ) < major > : < minor > major and minor number of the device separated by
* a colon .
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* 9 ) PARTLABEL = < name > with name being the GPT partition label .
* MSDOS partitions do not support labels !
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* 10 ) / dev / cifs represents Root_CIFS ( 0xfe )
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*
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* If name doesn ' t have fall into the categories above , we return ( 0 , 0 ) .
* block_class is used to check if something is a disk name . If the disk
* name contains slashes , the device name has them replaced with
* bangs .
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*/
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dev_t name_to_dev_t ( const char * name )
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{
char s [ 32 ] ;
char * p ;
dev_t res = 0 ;
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int part ;
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# ifdef CONFIG_BLOCK
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if ( strncmp ( name , " PARTUUID= " , 9 ) = = 0 ) {
name + = 9 ;
res = devt_from_partuuid ( name ) ;
if ( ! res )
goto fail ;
goto done ;
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} else if ( strncmp ( name , " PARTLABEL= " , 10 ) = = 0 ) {
struct device * dev ;
dev = class_find_device ( & block_class , NULL , name + 10 ,
& match_dev_by_label ) ;
if ( ! dev )
goto fail ;
res = dev - > devt ;
put_device ( dev ) ;
goto done ;
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}
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# endif
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if ( strncmp ( name , " /dev/ " , 5 ) ! = 0 ) {
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unsigned maj , min , offset ;
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char dummy ;
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2015-05-03 17:35:05 +03:00
if ( ( sscanf ( name , " %u:%u%c " , & maj , & min , & dummy ) = = 2 ) | |
( sscanf ( name , " %u:%u:%u:%c " , & maj , & min , & offset , & dummy ) = = 3 ) ) {
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res = MKDEV ( maj , min ) ;
if ( maj ! = MAJOR ( res ) | | min ! = MINOR ( res ) )
goto fail ;
} else {
res = new_decode_dev ( simple_strtoul ( name , & p , 16 ) ) ;
if ( * p )
goto fail ;
}
goto done ;
}
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name + = 5 ;
res = Root_NFS ;
if ( strcmp ( name , " nfs " ) = = 0 )
goto done ;
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res = Root_CIFS ;
if ( strcmp ( name , " cifs " ) = = 0 )
goto done ;
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res = Root_RAM0 ;
if ( strcmp ( name , " ram " ) = = 0 )
goto done ;
if ( strlen ( name ) > 31 )
goto fail ;
strcpy ( s , name ) ;
for ( p = s ; * p ; p + + )
if ( * p = = ' / ' )
* p = ' ! ' ;
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res = blk_lookup_devt ( s , 0 ) ;
if ( res )
goto done ;
/*
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* try non - existent , but valid partition , which may only exist
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* after revalidating the disk , like partitioned md devices
*/
while ( p > s & & isdigit ( p [ - 1 ] ) )
p - - ;
if ( p = = s | | ! * p | | * p = = ' 0 ' )
goto fail ;
/* try disk name without <part number> */
part = simple_strtoul ( p , NULL , 10 ) ;
* p = ' \0 ' ;
res = blk_lookup_devt ( s , part ) ;
if ( res )
goto done ;
/* try disk name without p<part number> */
if ( p < s + 2 | | ! isdigit ( p [ - 2 ] ) | | p [ - 1 ] ! = ' p ' )
goto fail ;
p [ - 1 ] = ' \0 ' ;
res = blk_lookup_devt ( s , part ) ;
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if ( res )
goto done ;
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fail :
return 0 ;
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done :
return res ;
}
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EXPORT_SYMBOL_GPL ( name_to_dev_t ) ;
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static int __init root_dev_setup ( char * line )
{
strlcpy ( saved_root_name , line , sizeof ( saved_root_name ) ) ;
return 1 ;
}
__setup ( " root= " , root_dev_setup ) ;
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static int __init rootwait_setup ( char * str )
{
if ( * str )
return 0 ;
root_wait = 1 ;
return 1 ;
}
__setup ( " rootwait " , rootwait_setup ) ;
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static char * __initdata root_mount_data ;
static int __init root_data_setup ( char * str )
{
root_mount_data = str ;
return 1 ;
}
static char * __initdata root_fs_names ;
static int __init fs_names_setup ( char * str )
{
root_fs_names = str ;
return 1 ;
}
static unsigned int __initdata root_delay ;
static int __init root_delay_setup ( char * str )
{
root_delay = simple_strtoul ( str , NULL , 0 ) ;
return 1 ;
}
__setup ( " rootflags= " , root_data_setup ) ;
__setup ( " rootfstype= " , fs_names_setup ) ;
__setup ( " rootdelay= " , root_delay_setup ) ;
static void __init get_fs_names ( char * page )
{
char * s = page ;
if ( root_fs_names ) {
strcpy ( page , root_fs_names ) ;
while ( * s + + ) {
if ( s [ - 1 ] = = ' , ' )
s [ - 1 ] = ' \0 ' ;
}
} else {
int len = get_filesystem_list ( page ) ;
char * p , * next ;
page [ len ] = ' \0 ' ;
for ( p = page - 1 ; p ; p = next ) {
next = strchr ( + + p , ' \n ' ) ;
if ( * p + + ! = ' \t ' )
continue ;
while ( ( * s + + = * p + + ) ! = ' \n ' )
;
s [ - 1 ] = ' \0 ' ;
}
}
* s = ' \0 ' ;
}
init: use do_mount() instead of ksys_mount()
In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.
In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().
Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-10-23 23:41:09 +03:00
static int __init do_mount_root ( const char * name , const char * fs ,
const int flags , const void * data )
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{
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struct super_block * s ;
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struct page * p = NULL ;
char * data_page = NULL ;
init: use do_mount() instead of ksys_mount()
In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.
In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().
Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-10-23 23:41:09 +03:00
int ret ;
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if ( data ) {
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/* init_mount() requires a full page as fifth argument */
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p = alloc_page ( GFP_KERNEL ) ;
if ( ! p )
return - ENOMEM ;
data_page = page_address ( p ) ;
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/* zero-pad. init_mount() will make sure it's terminated */
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strncpy ( data_page , data , PAGE_SIZE ) ;
}
init: use do_mount() instead of ksys_mount()
In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.
In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().
Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-10-23 23:41:09 +03:00
2020-07-21 12:12:08 +03:00
ret = init_mount ( name , " /root " , fs , flags , data_page ) ;
init: use do_mount() instead of ksys_mount()
In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.
In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().
Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-10-23 23:41:09 +03:00
if ( ret )
goto out ;
2005-04-17 02:20:36 +04:00
2020-07-22 12:25:21 +03:00
init_chdir ( " /root " ) ;
2011-12-08 03:16:57 +04:00
s = current - > fs - > pwd . dentry - > d_sb ;
ROOT_DEV = s - > s_dev ;
2011-03-23 02:33:54 +03:00
printk ( KERN_INFO
" VFS: Mounted root (%s filesystem)%s on device %u:%u. \n " ,
2011-12-08 03:16:57 +04:00
s - > s_type - > name ,
2017-07-17 10:45:34 +03:00
sb_rdonly ( s ) ? " readonly " : " " ,
2011-12-08 03:16:57 +04:00
MAJOR ( ROOT_DEV ) , MINOR ( ROOT_DEV ) ) ;
init: use do_mount() instead of ksys_mount()
In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.
In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().
Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-10-23 23:41:09 +03:00
out :
2019-12-16 06:50:23 +03:00
if ( p )
put_page ( p ) ;
init: use do_mount() instead of ksys_mount()
In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.
In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().
Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-10-23 23:41:09 +03:00
return ret ;
2005-04-17 02:20:36 +04:00
}
void __init mount_block_root ( char * name , int flags )
{
2017-11-16 04:35:54 +03:00
struct page * page = alloc_page ( GFP_KERNEL ) ;
2012-10-10 23:25:26 +04:00
char * fs_names = page_address ( page ) ;
2005-04-17 02:20:36 +04:00
char * p ;
char b [ BDEVNAME_SIZE ] ;
2020-03-24 10:25:11 +03:00
scnprintf ( b , BDEVNAME_SIZE , " unknown-block(%u,%u) " ,
MAJOR ( ROOT_DEV ) , MINOR ( ROOT_DEV ) ) ;
2005-04-17 02:20:36 +04:00
get_fs_names ( fs_names ) ;
retry :
for ( p = fs_names ; * p ; p + = strlen ( p ) + 1 ) {
int err = do_mount_root ( name , p , flags , root_mount_data ) ;
switch ( err ) {
case 0 :
goto out ;
case - EACCES :
case - EINVAL :
continue ;
}
/*
* Allow the user to distinguish between failed sys_open
* and bad superblock on root device .
2007-05-09 13:33:24 +04:00
* and give them a list of the available devices
2005-04-17 02:20:36 +04:00
*/
2012-03-24 02:02:28 +04:00
printk ( " VFS: Cannot open root device \" %s \" or %s: error %d \n " ,
root_device_name , b , err ) ;
2007-05-09 13:33:24 +04:00
printk ( " Please append a correct \" root= \" boot option; here are the available partitions: \n " ) ;
2005-04-17 02:20:36 +04:00
2007-05-09 13:33:24 +04:00
printk_all_partitions ( ) ;
2008-09-01 15:44:35 +04:00
# ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
printk ( " DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
" explicit textual name for \" root= \" boot option. \n " ) ;
# endif
2005-04-17 02:20:36 +04:00
panic ( " VFS: Unable to mount root fs on %s " , b ) ;
}
2017-07-17 10:45:35 +03:00
if ( ! ( flags & SB_RDONLY ) ) {
flags | = SB_RDONLY ;
2014-11-20 18:08:59 +03:00
goto retry ;
}
2006-05-15 20:44:29 +04:00
2007-05-09 13:33:24 +04:00
printk ( " List of all partitions: \n " ) ;
printk_all_partitions ( ) ;
2006-05-15 20:44:29 +04:00
printk ( " No filesystem could mount root, tried: " ) ;
for ( p = fs_names ; * p ; p + = strlen ( p ) + 1 )
printk ( " %s " , p ) ;
printk ( " \n " ) ;
[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 22:45:40 +04:00
panic ( " VFS: Unable to mount root fs on %s " , b ) ;
2005-04-17 02:20:36 +04:00
out :
2012-10-10 23:25:26 +04:00
put_page ( page ) ;
2005-04-17 02:20:36 +04:00
}
# ifdef CONFIG_ROOT_NFS
2011-12-06 00:40:30 +04:00
# define NFSROOT_TIMEOUT_MIN 5
# define NFSROOT_TIMEOUT_MAX 30
# define NFSROOT_RETRY_MAX 5
2005-04-17 02:20:36 +04:00
static int __init mount_nfs_root ( void )
{
2010-09-17 18:54:37 +04:00
char * root_dev , * root_data ;
2011-12-06 00:40:30 +04:00
unsigned int timeout ;
int try , err ;
2005-04-17 02:20:36 +04:00
2011-12-06 00:40:30 +04:00
err = nfs_root_data ( & root_dev , & root_data ) ;
if ( err ! = 0 )
2010-09-17 18:54:37 +04:00
return 0 ;
2011-12-06 00:40:30 +04:00
/*
* The server or network may not be ready , so try several
* times . Stop after a few tries in case the client wants
* to fall back to other boot methods .
*/
timeout = NFSROOT_TIMEOUT_MIN ;
for ( try = 1 ; ; try + + ) {
err = do_mount_root ( root_dev , " nfs " ,
root_mountflags , root_data ) ;
if ( err = = 0 )
return 1 ;
if ( try > NFSROOT_RETRY_MAX )
break ;
/* Wait, in case the server refused us immediately */
ssleep ( timeout ) ;
timeout < < = 1 ;
if ( timeout > NFSROOT_TIMEOUT_MAX )
timeout = NFSROOT_TIMEOUT_MAX ;
}
return 0 ;
2005-04-17 02:20:36 +04:00
}
# endif
2019-10-01 20:10:27 +03:00
# ifdef CONFIG_CIFS_ROOT
extern int cifs_root_data ( char * * dev , char * * opts ) ;
# define CIFSROOT_TIMEOUT_MIN 5
# define CIFSROOT_TIMEOUT_MAX 30
# define CIFSROOT_RETRY_MAX 5
static int __init mount_cifs_root ( void )
{
char * root_dev , * root_data ;
unsigned int timeout ;
int try , err ;
err = cifs_root_data ( & root_dev , & root_data ) ;
if ( err ! = 0 )
return 0 ;
timeout = CIFSROOT_TIMEOUT_MIN ;
for ( try = 1 ; ; try + + ) {
err = do_mount_root ( root_dev , " cifs " , root_mountflags ,
root_data ) ;
if ( err = = 0 )
return 1 ;
if ( try > CIFSROOT_RETRY_MAX )
break ;
ssleep ( timeout ) ;
timeout < < = 1 ;
if ( timeout > CIFSROOT_TIMEOUT_MAX )
timeout = CIFSROOT_TIMEOUT_MAX ;
}
return 0 ;
}
# endif
2005-04-17 02:20:36 +04:00
void __init mount_root ( void )
{
# ifdef CONFIG_ROOT_NFS
2012-05-05 19:06:35 +04:00
if ( ROOT_DEV = = Root_NFS ) {
2020-06-04 11:23:14 +03:00
if ( ! mount_nfs_root ( ) )
printk ( KERN_ERR " VFS: Unable to mount root fs via NFS. \n " ) ;
return ;
2005-04-17 02:20:36 +04:00
}
# endif
2019-10-01 20:10:27 +03:00
# ifdef CONFIG_CIFS_ROOT
if ( ROOT_DEV = = Root_CIFS ) {
2020-06-04 11:23:14 +03:00
if ( ! mount_cifs_root ( ) )
printk ( KERN_ERR " VFS: Unable to mount root fs via SMB. \n " ) ;
return ;
2005-04-17 02:20:36 +04:00
}
# endif
[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 22:45:40 +04:00
# ifdef CONFIG_BLOCK
2015-06-26 01:03:37 +03:00
{
int err = create_dev ( " /dev/root " , ROOT_DEV ) ;
if ( err < 0 )
pr_emerg ( " Failed to create /dev/root: %d \n " , err ) ;
mount_block_root ( " /dev/root " , root_mountflags ) ;
}
[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 22:45:40 +04:00
# endif
2005-04-17 02:20:36 +04:00
}
/*
* Prepare the namespace - decide what / where to mount , load ramdisks , etc .
*/
void __init prepare_namespace ( void )
{
if ( root_delay ) {
2013-07-04 02:05:38 +04:00
printk ( KERN_INFO " Waiting %d sec before mounting root device... \n " ,
2005-04-17 02:20:36 +04:00
root_delay ) ;
ssleep ( root_delay ) ;
}
2009-02-14 03:59:06 +03:00
/*
* wait for the known devices to complete their probing
*
* Note : this is a potential source of long boot delays .
* For example , it is not atypical to wait 5 seconds here
* for the touchpad of a laptop to initialize .
*/
wait_for_device_probe ( ) ;
2006-07-18 21:59:59 +04:00
2005-04-17 02:20:36 +04:00
md_run_setup ( ) ;
if ( saved_root_name [ 0 ] ) {
root_device_name = saved_root_name ;
2008-01-31 18:25:00 +03:00
if ( ! strncmp ( root_device_name , " mtd " , 3 ) | |
! strncmp ( root_device_name , " ubi " , 3 ) ) {
2006-05-30 16:25:46 +04:00
mount_block_root ( root_device_name , root_mountflags ) ;
goto out ;
}
2005-04-17 02:20:36 +04:00
ROOT_DEV = name_to_dev_t ( root_device_name ) ;
if ( strncmp ( root_device_name , " /dev/ " , 5 ) = = 0 )
root_device_name + = 5 ;
}
if ( initrd_load ( ) )
goto out ;
2007-07-16 10:40:35 +04:00
/* wait for any asynchronous scanning to complete */
if ( ( ROOT_DEV = = 0 ) & & root_wait ) {
printk ( KERN_INFO " Waiting for root device %s... \n " ,
saved_root_name ) ;
while ( driver_probe_done ( ) ! = 0 | |
( ROOT_DEV = name_to_dev_t ( saved_root_name ) ) = = 0 )
2016-12-13 03:46:43 +03:00
msleep ( 5 ) ;
2009-02-14 03:59:06 +03:00
async_synchronize_full ( ) ;
2007-07-16 10:40:35 +04:00
}
2005-04-17 02:20:36 +04:00
mount_root ( ) ;
out :
2018-10-23 23:10:35 +03:00
devtmpfs_mount ( ) ;
2020-07-21 12:12:08 +03:00
init_mount ( " . " , " / " , NULL , MS_MOVE , NULL ) ;
2018-03-11 13:34:41 +03:00
ksys_chroot ( " . " ) ;
2005-04-17 02:20:36 +04:00
}
2013-09-12 01:26:10 +04:00
2013-09-12 01:26:13 +04:00
static bool is_tmpfs ;
vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API
Convert the ramfs, shmem, tmpfs, devtmpfs and rootfs filesystems to the new
internal mount API as the old one will be obsoleted and removed. This
allows greater flexibility in communication of mount parameters between
userspace, the VFS and the filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Note that tmpfs is slightly tricky as it can contain embedded commas, so it
can't be trivially split up using strsep() to break on commas in
generic_parse_monolithic(). Instead, tmpfs has to supply its own generic
parser.
However, if tmpfs changes, then devtmpfs and rootfs, which are wrappers
around tmpfs or ramfs, must change too - and thus so must ramfs, so these
had to be converted also.
[AV: rewritten]
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hugh Dickins <hughd@google.com>
cc: linux-mm@kvack.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-03-25 19:38:31 +03:00
static int rootfs_init_fs_context ( struct fs_context * fc )
2013-09-12 01:26:10 +04:00
{
2013-09-12 01:26:13 +04:00
if ( IS_ENABLED ( CONFIG_TMPFS ) & & is_tmpfs )
vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API
Convert the ramfs, shmem, tmpfs, devtmpfs and rootfs filesystems to the new
internal mount API as the old one will be obsoleted and removed. This
allows greater flexibility in communication of mount parameters between
userspace, the VFS and the filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Note that tmpfs is slightly tricky as it can contain embedded commas, so it
can't be trivially split up using strsep() to break on commas in
generic_parse_monolithic(). Instead, tmpfs has to supply its own generic
parser.
However, if tmpfs changes, then devtmpfs and rootfs, which are wrappers
around tmpfs or ramfs, must change too - and thus so must ramfs, so these
had to be converted also.
[AV: rewritten]
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hugh Dickins <hughd@google.com>
cc: linux-mm@kvack.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-03-25 19:38:31 +03:00
return shmem_init_fs_context ( fc ) ;
2013-09-12 01:26:13 +04:00
vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API
Convert the ramfs, shmem, tmpfs, devtmpfs and rootfs filesystems to the new
internal mount API as the old one will be obsoleted and removed. This
allows greater flexibility in communication of mount parameters between
userspace, the VFS and the filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Note that tmpfs is slightly tricky as it can contain embedded commas, so it
can't be trivially split up using strsep() to break on commas in
generic_parse_monolithic(). Instead, tmpfs has to supply its own generic
parser.
However, if tmpfs changes, then devtmpfs and rootfs, which are wrappers
around tmpfs or ramfs, must change too - and thus so must ramfs, so these
had to be converted also.
[AV: rewritten]
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hugh Dickins <hughd@google.com>
cc: linux-mm@kvack.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-03-25 19:38:31 +03:00
return ramfs_init_fs_context ( fc ) ;
2013-09-12 01:26:10 +04:00
}
2019-05-31 00:48:35 +03:00
struct file_system_type rootfs_fs_type = {
2013-09-12 01:26:10 +04:00
. name = " rootfs " ,
vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API
Convert the ramfs, shmem, tmpfs, devtmpfs and rootfs filesystems to the new
internal mount API as the old one will be obsoleted and removed. This
allows greater flexibility in communication of mount parameters between
userspace, the VFS and the filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Note that tmpfs is slightly tricky as it can contain embedded commas, so it
can't be trivially split up using strsep() to break on commas in
generic_parse_monolithic(). Instead, tmpfs has to supply its own generic
parser.
However, if tmpfs changes, then devtmpfs and rootfs, which are wrappers
around tmpfs or ramfs, must change too - and thus so must ramfs, so these
had to be converted also.
[AV: rewritten]
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hugh Dickins <hughd@google.com>
cc: linux-mm@kvack.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-03-25 19:38:31 +03:00
. init_fs_context = rootfs_init_fs_context ,
2013-09-12 01:26:10 +04:00
. kill_sb = kill_litter_super ,
} ;
2019-06-02 01:09:44 +03:00
void __init init_rootfs ( void )
2013-09-12 01:26:10 +04:00
{
2013-09-12 01:26:13 +04:00
if ( IS_ENABLED ( CONFIG_TMPFS ) & & ! saved_root_name [ 0 ] & &
2019-06-02 01:09:44 +03:00
( ! root_fs_names | | strstr ( root_fs_names , " tmpfs " ) ) )
2013-09-12 01:26:13 +04:00
is_tmpfs = true ;
2013-09-12 01:26:10 +04:00
}