2005-04-16 16:20:36 -06:00
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/*
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* Resizable simple ram filesystem for Linux.
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*
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* Copyright (C) 2000 Linus Torvalds.
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* 2000 Transmeta Corp.
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*
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* Usage limits added by David Gibson, Linuxcare Australia.
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* This file is released under the GPL.
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*/
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/*
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* NOTE! This filesystem is probably most useful
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* not as a real filesystem, but as an example of
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* how virtual filesystems can be written.
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*
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* It doesn't get much simpler than this. Consider
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* that this file implements the full semantics of
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* a POSIX-compliant read-write filesystem.
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*
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* Note in particular how the filesystem does not
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* need to implement any data structures of its own
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* to keep track of the virtual data: using the VFS
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* caches is sufficient.
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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2006-02-24 14:04:23 -07:00
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#include <linux/time.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/backing-dev.h>
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#include <linux/ramfs.h>
|
Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-20 15:22:52 -06:00
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#include <linux/sched.h>
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2009-03-31 16:24:34 -06:00
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#include <linux/parser.h>
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2009-09-22 17:45:53 -06:00
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#include <linux/magic.h>
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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 02:04:11 -06:00
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#include <linux/slab.h>
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2005-04-16 16:20:36 -06:00
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#include <asm/uaccess.h>
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[PATCH] NOMMU: Provide shared-writable mmap support on ramfs
The attached patch makes ramfs support shared-writable mmaps by:
(1) Attempting to perform a contiguous block allocation to the requested size
when truncate attempts to increase the file from zero size, such as
happens when:
fd = shm_open("/file/on/ramfs", ...):
ftruncate(fd, size_requested);
addr = mmap(NULL, subsize, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED,
fd, offset);
(2) Permitting any shared-writable mapping over any contiguous set of extant
pages. get_unmapped_area() will return the address into the actual ramfs
pages. The mapping may start anywhere and be of any size, but may not go
over the end of file. Multiple mappings may overlap in any way.
(3) Not permitting a file to be shrunk if it would truncate any shared
mappings (private mappings are copied).
Thus this patch provides support for POSIX shared memory on NOMMU kernels,
with certain limitations such as there being a large enough block of pages
available to support the allocation and it only working on directly mappable
filesystems.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 01:11:41 -07:00
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#include "internal.h"
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2005-04-16 16:20:36 -06:00
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2009-03-31 16:24:34 -06:00
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#define RAMFS_DEFAULT_MODE 0755
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2007-02-12 01:55:41 -07:00
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static const struct super_operations ramfs_ops;
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2007-02-12 01:55:40 -07:00
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static const struct inode_operations ramfs_dir_inode_operations;
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2005-04-16 16:20:36 -06:00
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2014-01-23 16:54:55 -07:00
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static const struct address_space_operations ramfs_aops = {
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.readpage = simple_readpage,
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.write_begin = simple_write_begin,
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.write_end = simple_write_end,
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.set_page_dirty = __set_page_dirty_no_writeback,
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};
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2010-03-04 07:32:18 -07:00
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struct inode *ramfs_get_inode(struct super_block *sb,
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2011-07-26 01:16:55 -06:00
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const struct inode *dir, umode_t mode, dev_t dev)
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2005-04-16 16:20:36 -06:00
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{
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struct inode * inode = new_inode(sb);
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if (inode) {
|
2010-10-23 09:19:54 -06:00
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inode->i_ino = get_next_ino();
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2010-03-04 07:32:18 -07:00
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inode_init_owner(inode, dir, mode);
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2005-04-16 16:20:36 -06:00
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inode->i_mapping->a_ops = &ramfs_aops;
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2007-07-17 05:03:05 -06:00
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mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
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2008-10-18 21:26:42 -06:00
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mapping_set_unevictable(inode->i_mapping);
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2005-04-16 16:20:36 -06:00
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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switch (mode & S_IFMT) {
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default:
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init_special_inode(inode, mode, dev);
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break;
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case S_IFREG:
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inode->i_op = &ramfs_file_inode_operations;
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inode->i_fop = &ramfs_file_operations;
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break;
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case S_IFDIR:
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inode->i_op = &ramfs_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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/* directory inodes start off with i_nlink == 2 (for "." entry) */
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2006-10-01 00:29:04 -06:00
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inc_nlink(inode);
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2005-04-16 16:20:36 -06:00
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break;
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case S_IFLNK:
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inode->i_op = &page_symlink_inode_operations;
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2015-11-16 23:07:57 -07:00
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inode_nohighmem(inode);
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2005-04-16 16:20:36 -06:00
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break;
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}
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}
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return inode;
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}
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/*
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* File creation. Allocate an inode, and we're done..
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*/
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/* SMP-safe */
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static int
|
2011-07-25 23:52:52 -06:00
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ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
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2005-04-16 16:20:36 -06:00
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{
|
2010-03-04 07:32:18 -07:00
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struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev);
|
2005-04-16 16:20:36 -06:00
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int error = -ENOSPC;
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if (inode) {
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d_instantiate(dentry, inode);
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dget(dentry); /* Extra count - pin the dentry in core */
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error = 0;
|
2006-02-24 14:04:23 -07:00
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
2005-04-16 16:20:36 -06:00
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}
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return error;
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|
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}
|
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|
2011-07-25 23:41:39 -06:00
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static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
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2005-04-16 16:20:36 -06:00
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{
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int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
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if (!retval)
|
2006-10-01 00:29:04 -06:00
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inc_nlink(dir);
|
2005-04-16 16:20:36 -06:00
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return retval;
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|
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}
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|
|
2012-06-10 16:05:36 -06:00
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static int ramfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
|
2005-04-16 16:20:36 -06:00
|
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{
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|
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return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
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|
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}
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static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
|
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|
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{
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struct inode *inode;
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int error = -ENOSPC;
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|
|
2010-03-04 07:32:18 -07:00
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inode = ramfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0);
|
2005-04-16 16:20:36 -06:00
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if (inode) {
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|
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int l = strlen(symname)+1;
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error = page_symlink(inode, symname, l);
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|
|
if (!error) {
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d_instantiate(dentry, inode);
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dget(dentry);
|
2006-03-06 16:42:56 -07:00
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
2005-04-16 16:20:36 -06:00
|
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} else
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|
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iput(inode);
|
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|
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}
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return error;
|
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|
|
}
|
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|
|
2007-02-12 01:55:40 -07:00
|
|
|
static const struct inode_operations ramfs_dir_inode_operations = {
|
2005-04-16 16:20:36 -06:00
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.create = ramfs_create,
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.lookup = simple_lookup,
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.link = simple_link,
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.unlink = simple_unlink,
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.symlink = ramfs_symlink,
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.mkdir = ramfs_mkdir,
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.rmdir = simple_rmdir,
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.mknod = ramfs_mknod,
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|
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.rename = simple_rename,
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|
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};
|
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|
|
2007-02-12 01:55:41 -07:00
|
|
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static const struct super_operations ramfs_ops = {
|
2005-04-16 16:20:36 -06:00
|
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.statfs = simple_statfs,
|
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|
|
.drop_inode = generic_delete_inode,
|
2009-03-31 16:24:34 -06:00
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|
|
.show_options = generic_show_options,
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|
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};
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struct ramfs_mount_opts {
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|
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umode_t mode;
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|
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};
|
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enum {
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Opt_mode,
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Opt_err
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|
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};
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|
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static const match_table_t tokens = {
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|
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{Opt_mode, "mode=%o"},
|
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|
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{Opt_err, NULL}
|
|
|
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};
|
|
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|
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struct ramfs_fs_info {
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|
|
|
struct ramfs_mount_opts mount_opts;
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
2009-03-31 16:24:34 -06:00
|
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static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
|
|
|
|
{
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|
|
|
substring_t args[MAX_OPT_ARGS];
|
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|
|
int option;
|
|
|
|
int token;
|
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|
|
char *p;
|
|
|
|
|
|
|
|
opts->mode = RAMFS_DEFAULT_MODE;
|
|
|
|
|
|
|
|
while ((p = strsep(&data, ",")) != NULL) {
|
|
|
|
if (!*p)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
token = match_token(p, tokens, args);
|
|
|
|
switch (token) {
|
|
|
|
case Opt_mode:
|
|
|
|
if (match_octal(&args[0], &option))
|
|
|
|
return -EINVAL;
|
|
|
|
opts->mode = option & S_IALLUGO;
|
|
|
|
break;
|
2009-06-14 15:56:48 -06:00
|
|
|
/*
|
|
|
|
* We might like to report bad mount options here;
|
|
|
|
* but traditionally ramfs has ignored all mount options,
|
|
|
|
* and as it is used as a !CONFIG_SHMEM simple substitute
|
|
|
|
* for tmpfs, better continue to ignore other mount options.
|
|
|
|
*/
|
2009-03-31 16:24:34 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-03-16 14:55:21 -06:00
|
|
|
int ramfs_fill_super(struct super_block *sb, void *data, int silent)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2009-03-31 16:24:34 -06:00
|
|
|
struct ramfs_fs_info *fsi;
|
2012-02-12 20:08:01 -07:00
|
|
|
struct inode *inode;
|
2009-03-31 16:24:34 -06:00
|
|
|
int err;
|
|
|
|
|
|
|
|
save_mount_options(sb, data);
|
|
|
|
|
|
|
|
fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL);
|
2009-04-07 00:16:50 -06:00
|
|
|
sb->s_fs_info = fsi;
|
2012-02-12 20:08:01 -07:00
|
|
|
if (!fsi)
|
|
|
|
return -ENOMEM;
|
2009-03-31 16:24:34 -06:00
|
|
|
|
|
|
|
err = ramfs_parse_options(data, &fsi->mount_opts);
|
|
|
|
if (err)
|
2012-02-12 20:08:01 -07:00
|
|
|
return err;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2009-04-07 00:16:50 -06:00
|
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 06:29:47 -06:00
|
|
|
sb->s_blocksize = PAGE_SIZE;
|
|
|
|
sb->s_blocksize_bits = PAGE_SHIFT;
|
2009-04-07 00:16:50 -06:00
|
|
|
sb->s_magic = RAMFS_MAGIC;
|
|
|
|
sb->s_op = &ramfs_ops;
|
|
|
|
sb->s_time_gran = 1;
|
|
|
|
|
2010-03-04 07:32:18 -07:00
|
|
|
inode = ramfs_get_inode(sb, NULL, S_IFDIR | fsi->mount_opts.mode, 0);
|
2012-01-08 20:15:13 -07:00
|
|
|
sb->s_root = d_make_root(inode);
|
2012-02-12 20:08:01 -07:00
|
|
|
if (!sb->s_root)
|
|
|
|
return -ENOMEM;
|
2009-04-07 00:16:50 -06:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-07-25 01:46:36 -06:00
|
|
|
struct dentry *ramfs_mount(struct file_system_type *fs_type,
|
|
|
|
int flags, const char *dev_name, void *data)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2010-07-25 01:46:36 -06:00
|
|
|
return mount_nodev(fs_type, flags, data, ramfs_fill_super);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2009-03-31 16:24:34 -06:00
|
|
|
static void ramfs_kill_sb(struct super_block *sb)
|
|
|
|
{
|
|
|
|
kfree(sb->s_fs_info);
|
|
|
|
kill_litter_super(sb);
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
static struct file_system_type ramfs_fs_type = {
|
|
|
|
.name = "ramfs",
|
2010-07-25 01:46:36 -06:00
|
|
|
.mount = ramfs_mount,
|
2009-03-31 16:24:34 -06:00
|
|
|
.kill_sb = ramfs_kill_sb,
|
2013-01-25 17:37:44 -07:00
|
|
|
.fs_flags = FS_USERNS_MOUNT,
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
2013-09-11 15:26:10 -06:00
|
|
|
int __init init_ramfs_fs(void)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2013-09-11 15:26:08 -06:00
|
|
|
static unsigned long once;
|
|
|
|
|
|
|
|
if (test_and_set_bit(0, &once))
|
|
|
|
return 0;
|
2015-01-14 02:42:32 -07:00
|
|
|
return register_filesystem(&ramfs_fs_type);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2014-01-21 16:48:46 -07:00
|
|
|
fs_initcall(init_ramfs_fs);
|