Release 4.10 fs/ramfs/inode.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 <linux/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(inode);
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 116 | 65.17% | 2 | 13.33% |
| dmitriy monakhov | dmitriy monakhov | 12 | 6.74% | 1 | 6.67% |
| mel gorman | mel gorman | 9 | 5.06% | 1 | 6.67% |
| christoph hellwig | christoph hellwig | 7 | 3.93% | 1 | 6.67% |
| al viro | al viro | 7 | 3.93% | 3 | 20.00% |
| lee schermerhorn | lee schermerhorn | 7 | 3.93% | 1 | 6.67% |
| hirofumi ogawa | hirofumi ogawa | 7 | 3.93% | 1 | 6.67% |
| deepa dinamani | deepa dinamani | 4 | 2.25% | 1 | 6.67% |
| dave hansen | dave hansen | 3 | 1.69% | 1 | 6.67% |
| linus torvalds | linus torvalds | 3 | 1.69% | 1 | 6.67% |
| andrew morton | andrew morton | 2 | 1.12% | 1 | 6.67% |
| andries brouwer | andries brouwer | 1 | 0.56% | 1 | 6.67% |
| Total | 178 | 100.00% | 15 | 100.00% |
/*
* 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(dir);
}
return error;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 68 | 80.00% | 1 | 16.67% |
| andrew morton | andrew morton | 9 | 10.59% | 1 | 16.67% |
| deepa dinamani | deepa dinamani | 4 | 4.71% | 1 | 16.67% |
| dmitriy monakhov | dmitriy monakhov | 2 | 2.35% | 1 | 16.67% |
| andries brouwer | andries brouwer | 1 | 1.18% | 1 | 16.67% |
| al viro | al viro | 1 | 1.18% | 1 | 16.67% |
| Total | 85 | 100.00% | 6 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 31 | 64.58% | 1 | 25.00% |
| linus torvalds | linus torvalds | 13 | 27.08% | 1 | 25.00% |
| dave hansen | dave hansen | 3 | 6.25% | 1 | 25.00% |
| al viro | al viro | 1 | 2.08% | 1 | 25.00% |
| Total | 48 | 100.00% | 4 | 100.00% |
static int ramfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
{
return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 32 | 88.89% | 1 | 25.00% |
| al viro | al viro | 3 | 8.33% | 2 | 50.00% |
| trond myklebust | trond myklebust | 1 | 2.78% | 1 | 25.00% |
| Total | 36 | 100.00% | 4 | 100.00% |
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(dir);
} else
iput(inode);
}
return error;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 63 | 53.85% | 1 | 16.67% |
| al viro | al viro | 38 | 32.48% | 1 | 16.67% |
| peter staubach | peter staubach | 9 | 7.69% | 1 | 16.67% |
| deepa dinamani | deepa dinamani | 4 | 3.42% | 1 | 16.67% |
| dmitriy monakhov | dmitriy monakhov | 2 | 1.71% | 1 | 16.67% |
| andrew morton | andrew morton | 1 | 0.85% | 1 | 16.67% |
| Total | 117 | 100.00% | 6 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| fengguang wu | fengguang wu | 112 | 99.12% | 1 | 50.00% |
| mike frysinger | mike frysinger | 1 | 0.88% | 1 | 50.00% |
| Total | 113 | 100.00% | 2 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 60 | 36.81% | 1 | 10.00% |
| fengguang wu | fengguang wu | 58 | 35.58% | 1 | 10.00% |
| al viro | al viro | 18 | 11.04% | 3 | 30.00% |
| ingo molnar | ingo molnar | 11 | 6.75% | 1 | 10.00% |
| andi kleen | andi kleen | 6 | 3.68% | 1 | 10.00% |
| andrew morton | andrew morton | 6 | 3.68% | 1 | 10.00% |
| kirill a. shutemov | kirill a. shutemov | 2 | 1.23% | 1 | 10.00% |
| dmitriy monakhov | dmitriy monakhov | 2 | 1.23% | 1 | 10.00% |
| Total | 163 | 100.00% | 10 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| al viro | al viro | 30 | 83.33% | 2 | 50.00% |
| pre-git | pre-git | 5 | 13.89% | 1 | 25.00% |
| andries brouwer | andries brouwer | 1 | 2.78% | 1 | 25.00% |
| Total | 36 | 100.00% | 4 | 100.00% |
static void ramfs_kill_sb(struct super_block *sb)
{
kfree(sb->s_fs_info);
kill_litter_super(sb);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| fengguang wu | fengguang wu | 23 | 100.00% | 1 | 100.00% |
| Total | 23 | 100.00% | 1 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| rob landley | rob landley | 18 | 54.55% | 1 | 50.00% |
| pre-git | pre-git | 15 | 45.45% | 1 | 50.00% |
| Total | 33 | 100.00% | 2 | 100.00% |
fs_initcall(init_ramfs_fs);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 457 | 42.59% | 3 | 5.26% |
| fengguang wu | fengguang wu | 249 | 23.21% | 1 | 1.75% |
| al viro | al viro | 115 | 10.72% | 14 | 24.56% |
| andrew morton | andrew morton | 31 | 2.89% | 6 | 10.53% |
| axel lin | axel lin | 28 | 2.61% | 1 | 1.75% |
| art haas | art haas | 28 | 2.61% | 1 | 1.75% |
| linus torvalds | linus torvalds | 21 | 1.96% | 6 | 10.53% |
| dmitriy monakhov | dmitriy monakhov | 18 | 1.68% | 1 | 1.75% |
| rob landley | rob landley | 18 | 1.68% | 1 | 1.75% |
| deepa dinamani | deepa dinamani | 12 | 1.12% | 1 | 1.75% |
| ingo molnar | ingo molnar | 11 | 1.03% | 1 | 1.75% |
| peter staubach | peter staubach | 9 | 0.84% | 1 | 1.75% |
| mel gorman | mel gorman | 9 | 0.84% | 1 | 1.75% |
| christoph hellwig | christoph hellwig | 7 | 0.65% | 1 | 1.75% |
| lee schermerhorn | lee schermerhorn | 7 | 0.65% | 1 | 1.75% |
| hirofumi ogawa | hirofumi ogawa | 7 | 0.65% | 1 | 1.75% |
| dave hansen | dave hansen | 6 | 0.56% | 1 | 1.75% |
| andi kleen | andi kleen | 6 | 0.56% | 1 | 1.75% |
| eric w. biederman | eric w. biederman | 5 | 0.47% | 1 | 1.75% |
| andries brouwer | andries brouwer | 3 | 0.28% | 2 | 3.51% |
| paul gortmaker | paul gortmaker | 3 | 0.28% | 1 | 1.75% |
| maximilian attems | maximilian attems | 3 | 0.28% | 1 | 1.75% |
| tejun heo | tejun heo | 3 | 0.28% | 1 | 1.75% |
| alexey dobriyan | alexey dobriyan | 3 | 0.28% | 1 | 1.75% |
| matt mackall | matt mackall | 3 | 0.28% | 1 | 1.75% |
| david howells | david howells | 3 | 0.28% | 1 | 1.75% |
| kirill a. shutemov | kirill a. shutemov | 2 | 0.19% | 1 | 1.75% |
| arjan van de ven | arjan van de ven | 2 | 0.19% | 1 | 1.75% |
| josef 'jeff' sipek | josef 'jeff' sipek | 2 | 0.19% | 1 | 1.75% |
| mike frysinger | mike frysinger | 1 | 0.09% | 1 | 1.75% |
| trond myklebust | trond myklebust | 1 | 0.09% | 1 | 1.75% |
| Total | 1073 | 100.00% | 57 | 100.00% |
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