mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 00:06:39 +07:00
09cbfeaf1a
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>
268 lines
6.2 KiB
C
268 lines
6.2 KiB
C
/*
|
|
* Resizable simple ram filesystem for Linux.
|
|
*
|
|
* Copyright (C) 2000 Linus Torvalds.
|
|
* 2000 Transmeta Corp.
|
|
*
|
|
* Usage limits added by David Gibson, Linuxcare Australia.
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
/*
|
|
* NOTE! This filesystem is probably most useful
|
|
* not as a real filesystem, but as an example of
|
|
* how virtual filesystems can be written.
|
|
*
|
|
* It doesn't get much simpler than this. Consider
|
|
* that this file implements the full semantics of
|
|
* a POSIX-compliant read-write filesystem.
|
|
*
|
|
* Note in particular how the filesystem does not
|
|
* need to implement any data structures of its own
|
|
* to keep track of the virtual data: using the VFS
|
|
* caches is sufficient.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/time.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/ramfs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/parser.h>
|
|
#include <linux/magic.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/uaccess.h>
|
|
#include "internal.h"
|
|
|
|
#define RAMFS_DEFAULT_MODE 0755
|
|
|
|
static const struct super_operations ramfs_ops;
|
|
static const struct inode_operations ramfs_dir_inode_operations;
|
|
|
|
static const struct address_space_operations ramfs_aops = {
|
|
.readpage = simple_readpage,
|
|
.write_begin = simple_write_begin,
|
|
.write_end = simple_write_end,
|
|
.set_page_dirty = __set_page_dirty_no_writeback,
|
|
};
|
|
|
|
struct inode *ramfs_get_inode(struct super_block *sb,
|
|
const struct inode *dir, umode_t mode, dev_t dev)
|
|
{
|
|
struct inode * inode = new_inode(sb);
|
|
|
|
if (inode) {
|
|
inode->i_ino = get_next_ino();
|
|
inode_init_owner(inode, dir, mode);
|
|
inode->i_mapping->a_ops = &ramfs_aops;
|
|
mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
|
|
mapping_set_unevictable(inode->i_mapping);
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
switch (mode & S_IFMT) {
|
|
default:
|
|
init_special_inode(inode, mode, dev);
|
|
break;
|
|
case S_IFREG:
|
|
inode->i_op = &ramfs_file_inode_operations;
|
|
inode->i_fop = &ramfs_file_operations;
|
|
break;
|
|
case S_IFDIR:
|
|
inode->i_op = &ramfs_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
|
|
/* directory inodes start off with i_nlink == 2 (for "." entry) */
|
|
inc_nlink(inode);
|
|
break;
|
|
case S_IFLNK:
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
inode_nohighmem(inode);
|
|
break;
|
|
}
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
* File creation. Allocate an inode, and we're done..
|
|
*/
|
|
/* SMP-safe */
|
|
static int
|
|
ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
|
|
{
|
|
struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev);
|
|
int error = -ENOSPC;
|
|
|
|
if (inode) {
|
|
d_instantiate(dentry, inode);
|
|
dget(dentry); /* Extra count - pin the dentry in core */
|
|
error = 0;
|
|
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
|
|
{
|
|
int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
|
|
if (!retval)
|
|
inc_nlink(dir);
|
|
return retval;
|
|
}
|
|
|
|
static int ramfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
|
|
{
|
|
return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
|
|
}
|
|
|
|
static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
|
|
{
|
|
struct inode *inode;
|
|
int error = -ENOSPC;
|
|
|
|
inode = ramfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0);
|
|
if (inode) {
|
|
int l = strlen(symname)+1;
|
|
error = page_symlink(inode, symname, l);
|
|
if (!error) {
|
|
d_instantiate(dentry, inode);
|
|
dget(dentry);
|
|
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
|
} else
|
|
iput(inode);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static const struct inode_operations ramfs_dir_inode_operations = {
|
|
.create = ramfs_create,
|
|
.lookup = simple_lookup,
|
|
.link = simple_link,
|
|
.unlink = simple_unlink,
|
|
.symlink = ramfs_symlink,
|
|
.mkdir = ramfs_mkdir,
|
|
.rmdir = simple_rmdir,
|
|
.mknod = ramfs_mknod,
|
|
.rename = simple_rename,
|
|
};
|
|
|
|
static const struct super_operations ramfs_ops = {
|
|
.statfs = simple_statfs,
|
|
.drop_inode = generic_delete_inode,
|
|
.show_options = generic_show_options,
|
|
};
|
|
|
|
struct ramfs_mount_opts {
|
|
umode_t mode;
|
|
};
|
|
|
|
enum {
|
|
Opt_mode,
|
|
Opt_err
|
|
};
|
|
|
|
static const match_table_t tokens = {
|
|
{Opt_mode, "mode=%o"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
struct ramfs_fs_info {
|
|
struct ramfs_mount_opts mount_opts;
|
|
};
|
|
|
|
static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
int token;
|
|
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;
|
|
/*
|
|
* 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.
|
|
*/
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ramfs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct ramfs_fs_info *fsi;
|
|
struct inode *inode;
|
|
int err;
|
|
|
|
save_mount_options(sb, data);
|
|
|
|
fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL);
|
|
sb->s_fs_info = fsi;
|
|
if (!fsi)
|
|
return -ENOMEM;
|
|
|
|
err = ramfs_parse_options(data, &fsi->mount_opts);
|
|
if (err)
|
|
return err;
|
|
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_blocksize = PAGE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_SHIFT;
|
|
sb->s_magic = RAMFS_MAGIC;
|
|
sb->s_op = &ramfs_ops;
|
|
sb->s_time_gran = 1;
|
|
|
|
inode = ramfs_get_inode(sb, NULL, S_IFDIR | fsi->mount_opts.mode, 0);
|
|
sb->s_root = d_make_root(inode);
|
|
if (!sb->s_root)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct dentry *ramfs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_nodev(fs_type, flags, data, ramfs_fill_super);
|
|
}
|
|
|
|
static void ramfs_kill_sb(struct super_block *sb)
|
|
{
|
|
kfree(sb->s_fs_info);
|
|
kill_litter_super(sb);
|
|
}
|
|
|
|
static struct file_system_type ramfs_fs_type = {
|
|
.name = "ramfs",
|
|
.mount = ramfs_mount,
|
|
.kill_sb = ramfs_kill_sb,
|
|
.fs_flags = FS_USERNS_MOUNT,
|
|
};
|
|
|
|
int __init init_ramfs_fs(void)
|
|
{
|
|
static unsigned long once;
|
|
|
|
if (test_and_set_bit(0, &once))
|
|
return 0;
|
|
return register_filesystem(&ramfs_fs_type);
|
|
}
|
|
fs_initcall(init_ramfs_fs);
|