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b3b13d9187
mars/kernel/sy_old/sy_generic.c
Thomas Schoebel-Theuer b3b13d9187 infra: replace unwanted sys_rename() by provisionary wrapper
2017-05-04 10:08:29 +02:00

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/*
* MARS Long Distance Replication Software
*
* This file is part of MARS project: http://schoebel.github.io/mars/
*
* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
* Copyright (C) 2011-2014 1&1 Internet AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
//#define BRICK_DEBUGGING
#define MARS_DEBUGGING
//#define IO_DEBUGGING
#define STAT_DEBUGGING
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/file.h>
#include <linux/blkdev.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/utsname.h>
#include "strategy.h"
#include "../lib_mapfree.h"
#include "../mars_client.h"
#include "../compat.h"
#include <linux/namei.h>
#include <linux/kthread.h>
#include <linux/statfs.h>
#define SKIP_BIO false
// remove_this
#include <linux/wait.h>
#include <linux/version.h>
#ifndef DCACHE_MISS_TYPE /* define accessors compatible to b18825a7c8e37a7cf6abb97a12a6ad71af160de7 */
#define d_is_negative(dentry) ((dentry)->d_inode == NULL)
#define d_backing_inode(dentry) ((dentry)->d_inode)
#endif
/* FIXME: some Redhat/openvz kernels seem to have both (backporting etc).
* The folling is an incomplete quickfix / workaround. TBD.
*/
#if !defined(__WAIT_ATOMIC_T_KEY_INITIALIZER) || defined(RHEL_RELEASE)
#define HAS_VFS_READDIR
#elif !defined(f_dentry)
#define __HAS_NEW_FILLDIR_T
#endif
#ifdef RENAME_NOREPLACE
#define __HAS_RENAME2
#endif
// end_remove_this
/////////////////////////////////////////////////////////////////////
// meta descriptions
const struct meta mars_kstat_meta[] = {
META_INI(ino, struct kstat, FIELD_INT),
META_INI(mode, struct kstat, FIELD_INT),
META_INI(size, struct kstat, FIELD_INT),
META_INI_SUB(atime, struct kstat, mars_timespec_meta),
META_INI_SUB(mtime, struct kstat, mars_timespec_meta),
META_INI_SUB(ctime, struct kstat, mars_timespec_meta),
META_INI(blksize, struct kstat, FIELD_INT),
{}
};
EXPORT_SYMBOL_GPL(mars_kstat_meta);
const struct meta mars_dent_meta[] = {
META_INI(d_name, struct mars_dent, FIELD_STRING),
META_INI(d_rest, struct mars_dent, FIELD_STRING),
META_INI(d_path, struct mars_dent, FIELD_STRING),
META_INI(d_type, struct mars_dent, FIELD_INT),
META_INI(d_class, struct mars_dent, FIELD_INT),
META_INI(d_serial, struct mars_dent, FIELD_INT),
META_INI(d_corr_A, struct mars_dent, FIELD_INT),
META_INI(d_corr_B, struct mars_dent, FIELD_INT),
META_INI_SUB(new_stat,struct mars_dent, mars_kstat_meta),
META_INI_SUB(old_stat,struct mars_dent, mars_kstat_meta),
META_INI(new_link, struct mars_dent, FIELD_STRING),
META_INI(old_link, struct mars_dent, FIELD_STRING),
META_INI(d_args, struct mars_dent, FIELD_STRING),
META_INI(d_argv[0], struct mars_dent, FIELD_STRING),
META_INI(d_argv[1], struct mars_dent, FIELD_STRING),
META_INI(d_argv[2], struct mars_dent, FIELD_STRING),
META_INI(d_argv[3], struct mars_dent, FIELD_STRING),
{}
};
EXPORT_SYMBOL_GPL(mars_dent_meta);
// remove_this
#ifndef HAS_MARS_PREPATCH
/////////////////////////////////////////////////////////////////////
/* The _compat_*() functions are needed for the out-of-tree version
* of MARS for adapdation to different kernel version.
*/
#ifdef SB_FREEZE_LEVELS
/* since kernel 3.6 */
/* see a8104a9fcdeb82e22d7acd55fca20746581067d3 */
/* locking order changes in c30dabfe5d10c5fd70d882e5afb8f59f2942b194, we need to adapt */
#define __NEW_PATH_CREATE
#endif
#ifndef FSCACHE_OP_DEAD
/* since kernel 3.8 */
/* see b9d6ba94b875192ef5e2dab92d72beea33b83c3d */
#define __HAS_RETRY_ESTALE
#endif
/* Hack because of 8bcb77fabd7cbabcad49f58750be8683febee92b
*/
static int __path_parent(const char *name, struct path *path, unsigned flags)
{
#ifdef user_path
return kern_path(name, flags | LOOKUP_PARENT | LOOKUP_DIRECTORY | LOOKUP_FOLLOW, path);
#else
char *tmp;
int len;
int error;
len = strlen(name);
while (len > 0 && name[len] != '/')
len--;
if (unlikely(!len))
return -EINVAL;
tmp = brick_string_alloc(len + 1);
strncpy(tmp, name, len);
tmp[len] = '\0';
error = kern_path(tmp, flags | LOOKUP_DIRECTORY | LOOKUP_FOLLOW, path);
brick_string_free(tmp);
return error;
#endif
}
/* code is blindly stolen from symlinkat()
* and later adapted to various kernels
*/
int _compat_symlink(const char __user *oldname,
const char __user *newname)
{
const int newdfd = AT_FDCWD;
int error;
char *from;
struct dentry *dentry;
struct path path;
unsigned int lookup_flags = 0;
from = (char *)oldname;
#ifdef __HAS_RETRY_ESTALE
retry:
#endif
dentry = user_path_create(newdfd, newname, &path, lookup_flags);
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto out_putname;
#ifndef __NEW_PATH_CREATE
error = mnt_want_write(path.mnt);
if (error)
goto out_dput;
#endif
error = vfs_symlink(path.dentry->d_inode, dentry, from);
#ifdef __NEW_PATH_CREATE
done_path_create(&path, dentry);
#else
mnt_drop_write(path.mnt);
out_dput:
dput(dentry);
mutex_unlock(&path.dentry->d_inode->i_mutex);
path_put(&path);
#endif
#ifdef __HAS_RETRY_ESTALE
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
#endif
out_putname:
return error;
}
/* code is stolen from mkdirat()
*/
int _compat_mkdir(const char __user *pathname,
int mode)
{
const int dfd = AT_FDCWD;
struct dentry *dentry;
struct path path;
int error;
unsigned int lookup_flags = LOOKUP_DIRECTORY;
#ifdef __HAS_RETRY_ESTALE
retry:
#endif
dentry = user_path_create(dfd, pathname, &path, lookup_flags);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
if (!IS_POSIXACL(path.dentry->d_inode))
mode &= ~current_umask();
#ifndef __NEW_PATH_CREATE
error = mnt_want_write(path.mnt);
if (error)
goto out_dput;
#endif
error = vfs_mkdir(path.dentry->d_inode, dentry, mode);
#ifdef __NEW_PATH_CREATE
done_path_create(&path, dentry);
#else
mnt_drop_write(path.mnt);
out_dput:
dput(dentry);
mutex_unlock(&path.dentry->d_inode->i_mutex);
path_put(&path);
#endif
#ifdef __HAS_RETRY_ESTALE
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
#endif
return error;
}
/* This has some restrictions:
* - oldname and newname must reside in the same directory
* - standard case, no mountpoints inbetween
* - no security checks (we are anyway called from kernel code)
*/
int _compat_rename(const char *oldname,
const char *newname)
{
struct path oldpath;
struct path newpath;
struct dentry *old_dir;
struct dentry *new_dir;
struct dentry *old_dentry;
struct dentry *new_dentry;
struct dentry *trap;
const char *old_one;
const char *new_one;
const char *tmp;
unsigned int lookup_flags = 0;
#ifdef __HAS_RETRY_ESTALE
bool should_retry = false;
#endif
int error;
#ifdef __HAS_RETRY_ESTALE
retry:
#endif
error = __path_parent(oldname, &oldpath, lookup_flags);
if (unlikely(error))
goto exit;
old_dir = oldpath.dentry;
error = __path_parent(newname, &newpath, lookup_flags);
if (unlikely(error))
goto exit1;
new_dir = newpath.dentry;
old_one = oldname;
for (;;) {
for (tmp = old_one; *tmp && *tmp != '/'; tmp++)
/* empty */;
if (!*tmp)
break;
old_one = tmp + 1;
}
new_one = newname;
for (;;) {
for (tmp = new_one; *tmp && *tmp != '/'; tmp++)
/* empty */;
if (!*tmp)
break;
new_one = tmp + 1;
}
#ifdef __NEW_PATH_CREATE
error = mnt_want_write(oldpath.mnt);
if (unlikely(error))
goto exit2;
#endif
trap = lock_rename(new_dir, old_dir);
old_dentry = lookup_one_len(old_one, old_dir, strlen(old_one));
error = PTR_ERR(old_dentry);
if (unlikely(IS_ERR(old_dentry)))
goto out_unlock_rename;
error = -ENOENT;
if (unlikely(d_is_negative(old_dentry)))
goto out_dput_old;
error = -EINVAL;
if (unlikely(old_dentry == trap))
goto out_dput_old;
new_dentry = lookup_one_len(new_one, new_dir, strlen(new_one));
error = PTR_ERR(new_dentry);
if (unlikely(IS_ERR(new_dentry)))
goto out_dput_old;
error = -ENOTEMPTY;
if (unlikely(new_dentry == trap))
goto out_dput_new;
#ifndef __NEW_PATH_CREATE
error = mnt_want_write(oldpath.mnt);
if (unlikely(error))
goto out_dput_new;
#endif
#ifdef __HAS_RENAME2
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry, NULL, 0);
#elif defined(FL_DELEG)
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry, NULL);
#else
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry);
#endif
#ifndef __NEW_PATH_CREATE
mnt_drop_write(oldpath.mnt);
#endif
out_dput_new:
dput(new_dentry);
out_dput_old:
dput(old_dentry);
out_unlock_rename:
unlock_rename(new_dir, old_dir);
#ifdef __NEW_PATH_CREATE
mnt_drop_write(oldpath.mnt);
exit2:
#endif
#ifdef __HAS_RETRY_ESTALE
if (retry_estale(error, lookup_flags))
should_retry = true;
#endif
path_put(&newpath);
exit1:
path_put(&oldpath);
#ifdef __HAS_RETRY_ESTALE
if (should_retry) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
#endif
exit:
return error;
}
#endif
// end_remove_this
/////////////////////////////////////////////////////////////////////
// some helpers
static inline
int _length_paranoia(int len, int line)
{
if (unlikely(len < 0)) {
MARS_ERR("implausible string length %d (line=%d)\n", len, line);
len = PAGE_SIZE - 2;
} else if (unlikely(len > PAGE_SIZE - 2)) {
MARS_WRN("string length %d will be truncated to %d (line=%d)\n",
len, (int)PAGE_SIZE - 2, line);
len = PAGE_SIZE - 2;
}
return len;
}
int mars_stat(const char *path, struct kstat *stat, bool use_lstat)
{
mm_segment_t oldfs;
int status;
oldfs = get_fs();
set_fs(get_ds());
if (use_lstat) {
status = vfs_lstat((char*)path, stat);
} else {
status = vfs_stat((char*)path, stat);
}
set_fs(oldfs);
if (likely(status >= 0)) {
set_lamport(&stat->mtime);
}
return status;
}
EXPORT_SYMBOL_GPL(mars_stat);
void mars_sync(void)
{
struct file *f;
mm_segment_t oldfs;
oldfs = get_fs();
set_fs(get_ds());
f = filp_open("/mars", O_DIRECTORY | O_RDONLY, 0);
set_fs(oldfs);
if (unlikely(IS_ERR(f)))
return;
if (likely(f->f_mapping)) {
struct inode *inode = f->f_mapping->host;
if (likely(inode && inode->i_sb)) {
struct super_block *sb = inode->i_sb;
down_read(&sb->s_umount);
sync_filesystem(sb);
up_read(&sb->s_umount);
}
}
filp_close(f, NULL);
}
int mars_mkdir(const char *path)
{
mm_segment_t oldfs;
int status;
oldfs = get_fs();
set_fs(get_ds());
#ifdef HAS_MARS_PREPATCH
status = sys_mkdir(path, 0700);
#else
status = _compat_mkdir(path, 0700);
#endif
set_fs(oldfs);
return status;
}
EXPORT_SYMBOL_GPL(mars_mkdir);
int mars_rmdir(const char *path)
{
#ifdef HAS_MARS_PREPATCH
mm_segment_t oldfs;
int status;
oldfs = get_fs();
set_fs(get_ds());
status = sys_rmdir(path);
set_fs(oldfs);
return status;
#else
return -ENOSYS;
#endif
}
EXPORT_SYMBOL_GPL(mars_rmdir);
int mars_unlink(const char *path)
{
mm_segment_t oldfs;
int status;
oldfs = get_fs();
set_fs(get_ds());
status = sys_unlink(path);
set_fs(oldfs);
return status;
}
EXPORT_SYMBOL_GPL(mars_unlink);
int mars_symlink(const char *oldpath, const char *newpath, const struct timespec *stamp, uid_t uid)
{
char *tmp = backskip_replace(newpath, '/', true, "/.tmp-");
mm_segment_t oldfs;
struct kstat stat = {};
struct timespec times[2];
int status = -ENOMEM;
if (unlikely(!tmp))
goto done;
if (stamp)
memcpy(&times[0], stamp, sizeof(times[0]));
else
get_lamport(&times[0]);
#ifdef CONFIG_MARS_DEBUG
while (mars_hang_mode & 4)
brick_msleep(100);
#endif
oldfs = get_fs();
set_fs(get_ds());
/* Some filesystems have only full second resolution.
* Thus it may happen that the new timestamp is not
* truly moving forward when called twice shortly.
* This is a _workaround_, to be replaced by a better
* method somewhen.
*/
status = vfs_lstat((char*)newpath, &stat);
if (status >= 0 &&
!stamp &&
!stat.mtime.tv_nsec &&
times[0].tv_sec == stat.mtime.tv_sec) {
MARS_DBG("workaround timestamp tv_sec=%ld\n", stat.mtime.tv_sec);
times[0].tv_sec = stat.mtime.tv_sec + 1;
/* Setting tv_nsec to 1 prevents from unnecessarily reentering
* this workaround again if accidentally the original tv_nsec
* had been 0 or if the workaround had been triggered.
*/
times[0].tv_nsec = 1;
}
(void)sys_unlink(tmp);
#ifdef HAS_MARS_PREPATCH
status = sys_symlink(oldpath, tmp);
#else
status = _compat_symlink(oldpath, tmp);
#endif
if (status >= 0) {
#ifdef HAS_MARS_PREPATCH
sys_lchown(tmp, uid, 0);
#endif
memcpy(&times[1], &times[0], sizeof(struct timespec));
status = do_utimes(AT_FDCWD, tmp, times, AT_SYMLINK_NOFOLLOW);
}
if (status >= 0) {
set_lamport(&times[0]);
status = mars_rename(tmp, newpath);
}
set_fs(oldfs);
brick_string_free(tmp);
done:
return status;
}
EXPORT_SYMBOL_GPL(mars_symlink);
char *mars_readlink(const char *newpath)
{
char *res = NULL;
struct path path = {};
mm_segment_t oldfs;
struct inode *inode;
int len;
int status = -ENOMEM;
oldfs = get_fs();
set_fs(get_ds());
status = user_path_at(AT_FDCWD, newpath, 0, &path);
if (unlikely(status < 0)) {
MARS_DBG("link '%s' does not exist, status = %d\n", newpath, status);
goto done_fs;
}
inode = path.dentry->d_inode;
if (unlikely(!inode || !S_ISLNK(inode->i_mode))) {
MARS_ERR("link '%s' has invalid inode\n", newpath);
status = -EINVAL;
goto done_put;
}
len = i_size_read(inode);
if (unlikely(len <= 0 || len > PAGE_SIZE)) {
MARS_ERR("link '%s' invalid length = %d\n", newpath, len);
status = -EINVAL;
goto done_put;
}
res = brick_string_alloc(len + 2);
status = inode->i_op->readlink(path.dentry, res, len + 1);
if (unlikely(status < 0)) {
MARS_ERR("cannot read link '%s', status = %d\n", newpath, status);
} else {
set_lamport(&inode->i_mtime);
}
done_put:
path_put(&path);
done_fs:
set_fs(oldfs);
if (unlikely(status < 0)) {
if (unlikely(!res)) {
res = brick_string_alloc(1);
}
res[0] = '\0';
}
return res;
}
EXPORT_SYMBOL_GPL(mars_readlink);
int mars_rename(const char *oldpath, const char *newpath)
{
mm_segment_t oldfs;
int status;
oldfs = get_fs();
set_fs(get_ds());
#ifdef HAS_MARS_PREPATCH
status = sys_rename(oldpath, newpath);
#else
status = _compat_rename(oldpath, newpath);
#endif
set_fs(oldfs);
return status;
}
EXPORT_SYMBOL_GPL(mars_rename);
int mars_chmod(const char *path, mode_t mode)
{
#ifdef HAS_MARS_PREPATCH
mm_segment_t oldfs;
int status;
oldfs = get_fs();
set_fs(get_ds());
status = sys_chmod(path, mode);
set_fs(oldfs);
return status;
#else
return -ENOSYS;
#endif
}
EXPORT_SYMBOL_GPL(mars_chmod);
int mars_lchown(const char *path, uid_t uid)
{
#ifdef HAS_MARS_PREPATCH
mm_segment_t oldfs;
int status;
oldfs = get_fs();
set_fs(get_ds());
status = sys_lchown(path, uid, 0);
set_fs(oldfs);
return status;
#else
return -ENOSYS;
#endif
}
EXPORT_SYMBOL_GPL(mars_lchown);
loff_t _compute_space(struct kstatfs *kstatfs, loff_t raw_val)
{
int fsize = kstatfs->f_frsize;
if (fsize <= 0)
fsize = kstatfs->f_bsize;
MARS_INF("fsize = %d raw_val = %lld\n", fsize, raw_val);
// illegal values? cannot do anything....
if (fsize <= 0)
return 0;
// prevent intermediate integer overflows
if (fsize <= 1024)
return raw_val / (1024 / fsize);
return raw_val * (fsize / 1024);
}
void mars_remaining_space(const char *fspath, loff_t *total, loff_t *remaining)
{
struct path path = {};
struct kstatfs kstatfs = {};
mm_segment_t oldfs;
int res;
*total = *remaining = 0;
oldfs = get_fs();
set_fs(get_ds());
res = user_path_at(AT_FDCWD, fspath, 0, &path);
set_fs(oldfs);
if (unlikely(res < 0)) {
MARS_ERR("cannot get fspath '%s', err = %d\n\n", fspath, res);
goto err;
}
if (unlikely(!path.dentry)) {
MARS_ERR("bad dentry for fspath '%s'\n", fspath);
res = -ENXIO;
goto done;
}
#ifdef ST_RDONLY
res = vfs_statfs(&path, &kstatfs);
#else
res = vfs_statfs(path.dentry, &kstatfs);
#endif
if (unlikely(res < 0)) {
goto done;
}
*total = _compute_space(&kstatfs, kstatfs.f_blocks);
*remaining = _compute_space(&kstatfs, kstatfs.f_bavail);
done:
path_put(&path);
err: ;
}
EXPORT_SYMBOL_GPL(mars_remaining_space);
//////////////////////////////////////////////////////////////
// thread binding
void bind_to_dent(struct mars_dent *dent, struct say_channel **ch)
{
if (!dent) {
if (*ch) {
remove_binding_from(*ch, current);
*ch = NULL;
}
return;
}
// Memoize the channel. This is executed only once for each dent.
if (unlikely(!dent->d_say_channel)) {
struct mars_dent *test = dent->d_parent;
for (;;) {
if (!test) {
dent->d_say_channel = default_channel;
break;
}
if (test->d_use_channel && test->d_path) {
dent->d_say_channel = make_channel(test->d_path, true);
break;
}
test = test->d_parent;
}
}
if (dent->d_say_channel != *ch) {
if (*ch)
remove_binding_from(*ch, current);
*ch = dent->d_say_channel;
if (*ch)
bind_to_channel(*ch, current);
}
}
EXPORT_SYMBOL_GPL(bind_to_dent);
//////////////////////////////////////////////////////////////
// infrastructure
struct mars_global *mars_global = NULL;
EXPORT_SYMBOL_GPL(mars_global);
static
void __mars_trigger(void)
{
if (mars_global) {
mars_global->main_trigger = true;
wake_up_interruptible_all(&mars_global->main_event);
}
}
bool mars_check_inputs(struct mars_brick *brick)
{
int max_inputs;
int i;
if (likely(brick->type)) {
max_inputs = brick->type->max_inputs;
} else {
MARS_ERR("uninitialized brick '%s' '%s'\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path));
return true;
}
for (i = 0; i < max_inputs; i++) {
struct mars_input *input = brick->inputs[i];
struct mars_output *prev_output;
struct mars_brick *prev_brick;
if (!input)
continue;
prev_output = input->connect;
if (!prev_output)
continue;
prev_brick = prev_output->brick;
CHECK_PTR(prev_brick, done);
if (prev_brick->power.led_on)
continue;
done:
return true;
}
return false;
}
EXPORT_SYMBOL_GPL(mars_check_inputs);
bool mars_check_outputs(struct mars_brick *brick)
{
int i;
for (i = 0; i < brick->type->max_outputs; i++) {
struct mars_output *output = brick->outputs[i];
if (!output || !output->nr_connected)
continue;
return true;
}
return false;
}
EXPORT_SYMBOL_GPL(mars_check_outputs);
int mars_power_button(struct mars_brick *brick, bool val, bool force_off)
{
int status = 0;
bool oldval = brick->power.button;
if (force_off && !val)
brick->power.force_off = true;
if (brick->power.force_off)
val = false;
if (val != oldval) {
// check whether switching is possible
status = -EINVAL;
if (val) { // check all inputs
if (unlikely(mars_check_inputs(brick))) {
MARS_ERR("CANNOT SWITCH ON: brick '%s' '%s' has a turned-off predecessor\n", brick->brick_name, brick->brick_path);
goto done;
}
} else { // check all outputs
if (unlikely(mars_check_outputs(brick))) {
/* For now, we have a strong rule:
* Switching off is only allowed when no successor brick
* exists at all. This could be relaxed to checking
* whether all successor bricks are actually switched off.
* Probabĺy it is a good idea to retain the stronger rule
* as long as nobody needs the relaxed one.
*/
MARS_ERR("CANNOT SWITCH OFF: brick '%s' '%s' has a successor\n", brick->brick_name, brick->brick_path);
goto done;
}
}
MARS_DBG("brick '%s' '%s' type '%s' power button %d -> %d\n", brick->brick_name, brick->brick_path, brick->type->type_name, oldval, val);
set_button(&brick->power, val, false);
}
if (unlikely(!brick->ops)) {
MARS_ERR("brick '%s' '%s' has no brick_switch() method\n", brick->brick_name, brick->brick_path);
status = -EINVAL;
goto done;
}
/* Always call the switch function, even if nothing changes.
* The implementations must be idempotent.
* They may exploit the regular calls for some maintenance operations
* (e.g. changing disk capacity etc).
*/
status = brick->ops->brick_switch(brick);
if (val != oldval) {
mars_trigger();
}
done:
return status;
}
EXPORT_SYMBOL_GPL(mars_power_button);
/////////////////////////////////////////////////////////////////////
// strategy layer
struct mars_cookie {
struct mars_global *global;
mars_dent_checker_fn checker;
char *path;
struct mars_dent *parent;
int allocsize;
int depth;
bool hit;
};
static
int get_inode(char *newpath, struct mars_dent *dent)
{
mm_segment_t oldfs;
int status;
struct kstat tmp = {};
oldfs = get_fs();
set_fs(get_ds());
status = vfs_lstat(newpath, &tmp);
if (status < 0) {
MARS_WRN("cannot stat '%s', status = %d\n", newpath, status);
goto done;
}
memcpy(&dent->old_stat, &dent->new_stat, sizeof(dent->old_stat));
memcpy(&dent->new_stat, &tmp, sizeof(dent->new_stat));
if (S_ISLNK(dent->new_stat.mode)) {
struct path path = {};
int len = dent->new_stat.size;
struct inode *inode;
char *link;
if (unlikely(len <= 0)) {
MARS_ERR("symlink '%s' bad len = %d\n", newpath, len);
status = -EINVAL;
goto done;
}
len = _length_paranoia(len, __LINE__);
status = user_path_at(AT_FDCWD, newpath, 0, &path);
if (unlikely(status < 0)) {
MARS_WRN("cannot read link '%s'\n", newpath);
goto done;
}
inode = path.dentry->d_inode;
status = -ENOMEM;
link = brick_string_alloc(len + 2);
MARS_IO("len = %d\n", len);
status = inode->i_op->readlink(path.dentry, link, len + 1);
link[len] = '\0';
if (status < 0 ||
(dent->new_link && !strcmp(dent->new_link, link))) {
brick_string_free(link);
} else {
MARS_IO("symlink '%s' -> '%s' (%s) status = %d\n", newpath, link, dent->new_link ? dent->new_link : "", status);
brick_string_free(dent->old_link);
dent->old_link = dent->new_link;
dent->new_link = link;
}
path_put(&path);
} else if (S_ISREG(dent->new_stat.mode) && dent->d_name && !strncmp(dent->d_name, "log-", 4)) {
loff_t min = dent->new_stat.size;
loff_t max = 0;
dent->d_corr_A = 0;
dent->d_corr_B = 0;
mf_get_any_dirty(newpath, &min, &max, 0, 2);
if (min < dent->new_stat.size) {
MARS_DBG("file '%s' A size=%lld min=%lld max=%lld\n", newpath, dent->new_stat.size, min, max);
dent->d_corr_A = min;
}
mf_get_any_dirty(newpath, &min, &max, 0, 3);
if (min < dent->new_stat.size) {
MARS_DBG("file '%s' B size=%lld min=%lld max=%lld\n", newpath, dent->new_stat.size, min, max);
dent->d_corr_B = min;
}
}
if (dent->new_link)
MARS_IO("symlink '%s'\n", dent->new_link);
done:
set_fs(oldfs);
return status;
}
static
int dent_compare(struct mars_dent *a, struct mars_dent *b)
{
if (a->d_class < b->d_class) {
return -1;
}
if (a->d_class > b->d_class) {
return +1;
}
if (a->d_serial < b->d_serial) {
return -1;
}
if (a->d_serial > b->d_serial) {
return +1;
}
return strcmp(a->d_path, b->d_path);
}
// remove_this
#ifndef HAS_VFS_READDIR
// end_remove_this
struct mars_dir_context {
struct dir_context ctx;
struct mars_cookie *cookie;
};
// remove_this
#endif
// end_remove_this
#ifdef __HAS_NEW_FILLDIR_T
int mars_filler(struct dir_context *__buf, const char *name, int namlen, loff_t offset,
u64 ino, unsigned int d_type)
#else
static
int mars_filler(void *__buf, const char *name, int namlen, loff_t offset,
u64 ino, unsigned int d_type)
#endif
{
// remove_this
#ifdef HAS_VFS_READDIR
struct mars_cookie *cookie = __buf;
#else
// end_remove_this
struct mars_dir_context *buf = (void *)__buf;
struct mars_cookie *cookie = buf->cookie;
// remove_this
#endif
// end_remove_this
struct mars_global *global = cookie->global;
struct list_head *anchor = &global->dent_anchor;
struct list_head *start = anchor;
struct mars_dent *dent;
struct list_head *tmp;
char *newpath;
int prefix = 0;
int pathlen;
int class;
int serial = 0;
bool use_channel = false;
MARS_IO("ino = %llu len = %d offset = %lld type = %u\n", ino, namlen, offset, d_type);
cookie->hit = true;
if (name[0] == '.') {
return 0;
}
class = cookie->checker(cookie->parent, name, namlen, d_type, &prefix, &serial, &use_channel);
if (class < 0)
return 0;
pathlen = strlen(cookie->path);
newpath = brick_string_alloc(pathlen + namlen + 2);
if (unlikely(!newpath))
goto err_mem0;
memcpy(newpath, cookie->path, pathlen);
newpath[pathlen++] = '/';
memcpy(newpath + pathlen, name, namlen);
pathlen += namlen;
newpath[pathlen] = '\0';
MARS_IO("path = '%s'\n", newpath);
dent = brick_zmem_alloc(cookie->allocsize);
if (unlikely(!dent))
goto err_mem1;
dent->d_class = class;
dent->d_serial = serial;
dent->d_path = newpath;
for (tmp = anchor->next; tmp != anchor; tmp = tmp->next) {
struct mars_dent *test = container_of(tmp, struct mars_dent, dent_link);
int cmp = dent_compare(test, dent);
if (!cmp) {
brick_mem_free(dent);
dent = test;
goto found;
}
// keep the list sorted. find the next smallest member.
if (cmp > 0)
break;
start = tmp;
}
dent->d_name = brick_string_alloc(namlen + 1);
if (unlikely(!dent->d_name))
goto err_mem2;
memcpy(dent->d_name, name, namlen);
dent->d_name[namlen] = '\0';
dent->d_rest = brick_strdup(dent->d_name + prefix);
if (unlikely(!dent->d_rest))
goto err_mem3;
newpath = NULL;
INIT_LIST_HEAD(&dent->dent_link);
INIT_LIST_HEAD(&dent->brick_list);
list_add(&dent->dent_link, start);
found:
dent->d_type = d_type;
dent->d_class = class;
dent->d_serial = serial;
if (dent->d_parent)
dent->d_parent->d_child_count--;
dent->d_parent = cookie->parent;
if (dent->d_parent)
dent->d_parent->d_child_count++;
dent->d_depth = cookie->depth;
dent->d_global = global;
dent->d_killme = false;
dent->d_use_channel = use_channel;
brick_string_free(newpath);
return 0;
err_mem3:
brick_mem_free(dent->d_name);
err_mem2:
brick_mem_free(dent);
err_mem1:
brick_string_free(newpath);
err_mem0:
return -ENOMEM;
}
static int _mars_readdir(struct mars_cookie *cookie)
{
struct file *f;
struct address_space *mapping;
mm_segment_t oldfs;
int status = 0;
oldfs = get_fs();
set_fs(get_ds());
f = filp_open(cookie->path, O_DIRECTORY | O_RDONLY, 0);
set_fs(oldfs);
if (unlikely(IS_ERR(f))) {
return PTR_ERR(f);
}
if ((mapping = f->f_mapping)) {
mapping_set_gfp_mask(mapping, mapping_gfp_mask(mapping) & ~(__GFP_IO | __GFP_FS));
}
for (;;) {
// remove_this
#ifdef HAS_VFS_READDIR
cookie->hit = false;
status = vfs_readdir(f, mars_filler, cookie);
#else
// end_remove_this
struct mars_dir_context buf = {
.ctx.actor = mars_filler,
.cookie = cookie,
};
cookie->hit = false;
status = iterate_dir(f, &buf.ctx);
// remove_this
#endif
// end_remove_this
if (!cookie->hit)
break;
if (unlikely(status < 0)) {
MARS_ERR("readdir() on path='%s' status=%d\n", cookie->path, status);
break;
}
}
filp_close(f, NULL);
return status;
}
int mars_dent_work(struct mars_global *global, char *dirname, int allocsize, mars_dent_checker_fn checker, mars_dent_worker_fn worker, void *buf, int maxdepth)
{
static int version = 0;
struct mars_cookie cookie = {
.global = global,
.checker = checker,
.path = dirname,
.parent = NULL,
.allocsize = allocsize,
.depth = 0,
};
struct say_channel *say_channel = NULL;
struct list_head *tmp;
struct list_head *next;
int rounds = 0;
int status;
int total_status = 0;
bool found_dir;
/* Initialize the flat dent list
*/
version++;
global->global_version = version;
total_status = _mars_readdir(&cookie);
if (total_status || !worker) {
goto done;
}
down_write(&global->dent_mutex);
restart:
MARS_IO("at restart\n");
found_dir = false;
/* First, get all the inode information in a separate pass
* before starting work.
* The separate pass is necessary because some dents may
* forward-reference other dents, and it would be a pity if
* some inodes were not available or were outdated.
*/
for (tmp = global->dent_anchor.next; tmp != &global->dent_anchor; tmp = tmp->next) {
struct mars_dent *dent = container_of(tmp, struct mars_dent, dent_link);
// treat any member only once during this invocation
if (dent->d_version == version)
continue;
dent->d_version = version;
bind_to_dent(dent, &say_channel);
//MARS_IO("reading inode '%s'\n", dent->d_path);
status = get_inode(dent->d_path, dent);
total_status |= status;
// mark gone dents for removal
if (unlikely(status < 0) && list_empty(&dent->brick_list))
dent->d_killme = true;
// recurse into subdirectories by inserting into the flat list
if (S_ISDIR(dent->new_stat.mode) && dent->d_depth <= maxdepth) {
struct mars_cookie sub_cookie = {
.global = global,
.checker = checker,
.path = dent->d_path,
.allocsize = allocsize,
.parent = dent,
.depth = dent->d_depth + 1,
};
found_dir = true;
status = _mars_readdir(&sub_cookie);
total_status |= status;
if (status < 0) {
MARS_INF("forward: status %d on '%s'\n", status, dent->d_path);
}
}
}
bind_to_dent(NULL, &say_channel);
if (found_dir && ++rounds < 10) {
brick_yield();
goto restart;
}
up_write(&global->dent_mutex);
/* Preparation pass.
* Here is a chance to mark some dents for removal
* (or other types of non-destructive operations)
*/
down_read(&global->dent_mutex);
MARS_IO("prep pass\n");
for (tmp = global->dent_anchor.next, next = tmp->next; tmp != &global->dent_anchor; tmp = next, next = next->next) {
struct mars_dent *dent = container_of(tmp, struct mars_dent, dent_link);
up_read(&global->dent_mutex);
brick_yield();
bind_to_dent(dent, &say_channel);
//MARS_IO("forward prepare '%s'\n", dent->d_path);
status = worker(buf, dent, true, false);
if (status) {
//MARS_IO("forward treat '%s' status = %d\n", dent->d_path, status);
}
down_read(&global->dent_mutex);
total_status |= status;
}
up_read(&global->dent_mutex);
bind_to_dent(NULL, &say_channel);
/* Remove all dents marked for removal.
*/
down_write(&global->dent_mutex);
MARS_IO("removal pass\n");
for (tmp = global->dent_anchor.next, next = tmp->next; tmp != &global->dent_anchor; tmp = next, next = next->next) {
struct mars_dent *dent = container_of(tmp, struct mars_dent, dent_link);
if (!dent->d_killme)
continue;
bind_to_dent(dent, &say_channel);
MARS_DBG("killing dent '%s'\n", dent->d_path);
list_del_init(tmp);
mars_free_dent(dent);
}
up_write(&global->dent_mutex);
bind_to_dent(NULL, &say_channel);
/* Forward pass.
*/
down_read(&global->dent_mutex);
MARS_IO("forward pass\n");
for (tmp = global->dent_anchor.next, next = tmp->next; tmp != &global->dent_anchor; tmp = next, next = next->next) {
struct mars_dent *dent = container_of(tmp, struct mars_dent, dent_link);
up_read(&global->dent_mutex);
brick_yield();
bind_to_dent(dent, &say_channel);
//MARS_IO("forward treat '%s'\n", dent->d_path);
status = worker(buf, dent, false, false);
if (status) {
//MARS_IO("forward treat '%s' status = %d\n", dent->d_path, status);
}
down_read(&global->dent_mutex);
total_status |= status;
}
bind_to_dent(NULL, &say_channel);
/* Backward pass.
*/
MARS_IO("backward pass\n");
for (tmp = global->dent_anchor.prev, next = tmp->prev; tmp != &global->dent_anchor; tmp = next, next = next->prev) {
struct mars_dent *dent = container_of(tmp, struct mars_dent, dent_link);
up_read(&global->dent_mutex);
brick_yield();
bind_to_dent(dent, &say_channel);
//MARS_IO("backward treat '%s'\n", dent->d_path);
status = worker(buf, dent, false, true);
if (status) {
//MARS_IO("backward treat '%s' status = %d\n", dent->d_path, status);
}
down_read(&global->dent_mutex);
total_status |= status;
if (status < 0) {
MARS_INF("backwards: status %d on '%s'\n", status, dent->d_path);
}
}
up_read(&global->dent_mutex);
bind_to_dent(NULL, &say_channel);
done:
MARS_IO("total_status = %d\n", total_status);
return total_status;
}
EXPORT_SYMBOL_GPL(mars_dent_work);
struct mars_dent *_mars_find_dent(struct mars_global *global, const char *path)
{
struct mars_dent *res = NULL;
struct list_head *tmp;
if (!rwsem_is_locked(&global->dent_mutex)) {
MARS_ERR("dent_mutex not held!\n");
}
for (tmp = global->dent_anchor.next; tmp != &global->dent_anchor; tmp = tmp->next) {
struct mars_dent *tmp_dent = container_of(tmp, struct mars_dent, dent_link);
if (!strcmp(tmp_dent->d_path, path)) {
res = tmp_dent;
break;
}
}
return res;
}
EXPORT_SYMBOL_GPL(_mars_find_dent);
struct mars_dent *mars_find_dent(struct mars_global *global, const char *path)
{
struct mars_dent *res;
if (!global)
return NULL;
down_read(&global->dent_mutex);
res = _mars_find_dent(global, path);
up_read(&global->dent_mutex);
return res;
}
EXPORT_SYMBOL_GPL(mars_find_dent);
int mars_find_dent_all(struct mars_global *global, char *prefix, struct mars_dent ***table)
{
int max = 1024; // provisionary
int count = 0;
struct list_head *tmp;
struct mars_dent **res = brick_zmem_alloc(max * sizeof(void*));
int prefix_len = strlen(prefix);
*table = res;
if (unlikely(!res || !global))
goto done;
down_read(&global->dent_mutex);
for (tmp = global->dent_anchor.next; tmp != &global->dent_anchor; tmp = tmp->next) {
struct mars_dent *tmp_dent = container_of(tmp, struct mars_dent, dent_link);
int this_len;
if (!tmp_dent->d_path) {
continue;
}
this_len = strlen(tmp_dent->d_path);
if (this_len < prefix_len || strncmp(tmp_dent->d_path, prefix, prefix_len)) {
continue;
}
res[count++] = tmp_dent;
if (count >= max)
break;
}
up_read(&global->dent_mutex);
done:
return count;
}
EXPORT_SYMBOL_GPL(mars_find_dent_all);
void mars_kill_dent(struct mars_dent *dent)
{
dent->d_killme = true;
mars_kill_brick_all(NULL, &dent->brick_list, true);
}
EXPORT_SYMBOL_GPL(mars_kill_dent);
void mars_free_dent(struct mars_dent *dent)
{
int i;
MARS_IO("%p path='%s'\n", dent, dent->d_path);
mars_kill_dent(dent);
CHECK_HEAD_EMPTY(&dent->dent_link);
CHECK_HEAD_EMPTY(&dent->brick_list);
for (i = 0; i < MARS_ARGV_MAX; i++) {
brick_string_free(dent->d_argv[i]);
}
brick_string_free(dent->d_args);
brick_string_free(dent->d_name);
brick_string_free(dent->d_rest);
brick_string_free(dent->d_path);
brick_string_free(dent->old_link);
brick_string_free(dent->new_link);
if (likely(dent->d_parent)) {
dent->d_parent->d_child_count--;
}
if (dent->d_private_destruct) {
dent->d_private_destruct(dent->d_private);
}
brick_mem_free(dent->d_private);
brick_mem_free(dent);
}
EXPORT_SYMBOL_GPL(mars_free_dent);
void mars_free_dent_all(struct mars_global *global, struct list_head *anchor)
{
LIST_HEAD(tmp_list);
if (global)
down_write(&global->dent_mutex);
list_replace_init(anchor, &tmp_list);
if (global)
up_write(&global->dent_mutex);
MARS_DBG("is_empty=%d\n", list_empty(&tmp_list));
while (!list_empty(&tmp_list)) {
struct mars_dent *dent;
dent = container_of(tmp_list.prev, struct mars_dent, dent_link);
list_del_init(&dent->dent_link);
MARS_IO("freeing dent %p\n", dent);
mars_free_dent(dent);
}
}
EXPORT_SYMBOL_GPL(mars_free_dent_all);
/////////////////////////////////////////////////////////////////////
// low-level brick instantiation
int mars_connect(struct mars_input *a, struct mars_output *b)
{
struct mars_brick *a_brick = a->brick;
struct mars_global *a_global = a_brick->global;
struct mars_brick *b_brick = b->brick;
struct mars_global *b_global = b_brick->global;
int status;
if (a_global)
down_write(&a_global->brick_mutex);
if (b_global && b_global != a_global)
down_write(&b_global->brick_mutex);
status = generic_connect((void*)a, (void*)b);
if (b_global && b_global != a_global)
up_write(&b_global->brick_mutex);
if (a_global)
up_write(&a_global->brick_mutex);
return status;
}
int mars_disconnect(struct mars_input *a)
{
struct mars_brick *a_brick = a->brick;
struct mars_global *a_global = a_brick->global;
struct mars_output *b;
int status = 0;
if (a_global)
down_write(&a_global->brick_mutex);
b = a->connect;
if (b) {
struct mars_brick *b_brick = b->brick;
struct mars_global *b_global = b_brick->global;
if (b_global && b_global != a_global)
down_write(&b_global->brick_mutex);
status = generic_disconnect((void*)a);
if (b_global && b_global != a_global)
up_write(&b_global->brick_mutex);
}
if (a_global)
up_write(&a_global->brick_mutex);
return status;
}
struct mars_brick *mars_find_brick(struct mars_global *global, const void *brick_type, const char *path)
{
struct list_head *tmp;
if (!global || !path)
return NULL;
down_read(&global->brick_mutex);
for (tmp = global->brick_anchor.next; tmp != &global->brick_anchor; tmp = tmp->next) {
struct mars_brick *test = container_of(tmp, struct mars_brick, global_brick_link);
if (!strcmp(test->brick_path, path)) {
up_read(&global->brick_mutex);
if (brick_type && test->type != brick_type) {
MARS_ERR("bad brick type\n");
return NULL;
}
return test;
}
}
up_read(&global->brick_mutex);
return NULL;
}
EXPORT_SYMBOL_GPL(mars_find_brick);
int mars_free_brick(struct mars_brick *brick)
{
struct mars_global *global;
int i;
int count;
int status;
int sleeptime;
int maxsleep;
if (!brick) {
MARS_ERR("bad brick parameter\n");
status = -EINVAL;
goto done;
}
if (!brick->power.force_off || !brick->power.led_off) {
MARS_WRN("brick '%s' is not freeable\n", brick->brick_path);
status = -ETXTBSY;
goto done;
}
// first check whether the brick is in use somewhere
for (i = 0; i < brick->type->max_outputs; i++) {
struct mars_output *output = brick->outputs[i];
if (output && output->nr_connected > 0) {
MARS_WRN("brick '%s' not freeable, output %i is used\n", brick->brick_path, i);
status = -EEXIST;
goto done;
}
}
// Should not happen, but workaround: wait until flying IO has vanished
maxsleep = 20000;
sleeptime = 1000;
for (;;) {
count = atomic_read(&brick->mref_object_layout.alloc_count);
if (likely(!count)) {
break;
}
if (maxsleep > 0) {
MARS_WRN("MEMLEAK: brick '%s' has %d mrefs allocated (total = %d, maxsleep = %d)\n", brick->brick_path, count, atomic_read(&brick->mref_object_layout.total_alloc_count), maxsleep);
} else {
MARS_ERR("MEMLEAK: brick '%s' has %d mrefs allocated (total = %d)\n", brick->brick_path, count, atomic_read(&brick->mref_object_layout.total_alloc_count));
break;
}
brick_msleep(sleeptime);
maxsleep -= sleeptime;
}
MARS_DBG("===> freeing brick name = '%s' path = '%s'\n", brick->brick_name, brick->brick_path);
global = brick->global;
if (global) {
down_write(&global->brick_mutex);
list_del_init(&brick->global_brick_link);
list_del_init(&brick->dent_brick_link);
up_write(&global->brick_mutex);
}
for (i = 0; i < brick->type->max_inputs; i++) {
struct mars_input *input = brick->inputs[i];
if (input) {
MARS_DBG("disconnecting input %i\n", i);
mars_disconnect(input);
}
}
MARS_DBG("deallocate name = '%s' path = '%s'\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path));
brick_string_free(brick->brick_name);
brick_string_free(brick->brick_path);
status = generic_brick_exit_full((void*)brick);
if (status >= 0) {
brick_mem_free(brick);
mars_trigger();
} else {
MARS_ERR("error freeing brick, status = %d\n", status);
}
done:
return status;
}
EXPORT_SYMBOL_GPL(mars_free_brick);
struct mars_brick *mars_make_brick(struct mars_global *global, struct mars_dent *belongs, const void *_brick_type, const char *path, const char *_name)
{
const char *name = brick_strdup(_name);
const char *names[] = { name, NULL };
const struct generic_brick_type *brick_type = _brick_type;
const struct generic_input_type **input_types;
const struct generic_output_type **output_types;
struct mars_brick *res;
int size;
int i;
int status;
if (!name) {
MARS_ERR("cannot allocate space for name\n");
return NULL;
}
size = brick_type->brick_size +
(brick_type->max_inputs + brick_type->max_outputs) * sizeof(void*);
input_types = brick_type->default_input_types;
for (i = 0; i < brick_type->max_inputs; i++) {
const struct generic_input_type *type = *input_types++;
if (unlikely(!type)) {
MARS_ERR("input_type %d is missing\n", i);
goto err_name;
}
if (unlikely(type->input_size <= 0)) {
MARS_ERR("bad input_size at %d\n", i);
goto err_name;
}
size += type->input_size;
}
output_types = brick_type->default_output_types;
for (i = 0; i < brick_type->max_outputs; i++) {
const struct generic_output_type *type = *output_types++;
if (unlikely(!type)) {
MARS_ERR("output_type %d is missing\n", i);
goto err_name;
}
if (unlikely(type->output_size <= 0)) {
MARS_ERR("bad output_size at %d\n", i);
goto err_name;
}
size += type->output_size;
}
res = brick_zmem_alloc(size);
if (!res) {
MARS_ERR("cannot grab %d bytes for brick type '%s'\n", size, brick_type->type_name);
goto err_name;
}
get_lamport(&res->create_stamp);
res->global = global;
INIT_LIST_HEAD(&res->dent_brick_link);
res->brick_path = brick_strdup(path);
if (!res->brick_path) {
MARS_ERR("cannot grab memory for path '%s'\n", path);
goto err_res;
}
status = generic_brick_init_full(res, size, brick_type, NULL, NULL, names);
MARS_DBG("brick '%s' init '%s' '%s' (status=%d)\n", brick_type->type_name, path, name, status);
if (status < 0) {
MARS_ERR("cannot init brick %s\n", brick_type->type_name);
goto err_path;
}
res->free = mars_free_brick;
/* Immediately make it visible, regardless of internal state.
* Switching on / etc must be done separately.
*/
down_write(&global->brick_mutex);
list_add(&res->global_brick_link, &global->brick_anchor);
if (belongs) {
list_add_tail(&res->dent_brick_link, &belongs->brick_list);
}
up_write(&global->brick_mutex);
return res;
err_path:
brick_string_free(res->brick_path);
err_res:
brick_mem_free(res);
err_name:
brick_string_free(name);
return NULL;
}
EXPORT_SYMBOL_GPL(mars_make_brick);
int mars_kill_brick(struct mars_brick *brick)
{
struct mars_global *global;
int status = -EINVAL;
CHECK_PTR(brick, done);
global = brick->global;
MARS_DBG("===> killing brick %s path = '%s' name = '%s'\n", brick->type ? SAFE_STR(brick->type->type_name) : "undef", SAFE_STR(brick->brick_path), SAFE_STR(brick->brick_name));
if (unlikely(brick->nr_outputs > 0 && brick->outputs[0] && brick->outputs[0]->nr_connected)) {
MARS_ERR("sorry, output is in use '%s'\n", SAFE_STR(brick->brick_path));
goto done;
}
if (brick->show_status) {
brick->show_status(brick, true);
}
// start shutdown
set_button_wait((void*)brick, false, true, 0);
if (likely(brick->power.led_off)) {
int max_inputs = 0;
bool failed = false;
int i;
if (global) {
down_write(&global->brick_mutex);
list_del_init(&brick->global_brick_link);
list_del_init(&brick->dent_brick_link);
up_write(&global->brick_mutex);
}
if (likely(brick->type)) {
max_inputs = brick->type->max_inputs;
} else {
MARS_ERR("uninitialized brick '%s' '%s'\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path));
}
MARS_DBG("---> freeing '%s' '%s'\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path));
if (brick->kill_ptr)
*brick->kill_ptr = NULL;
for (i = 0; i < max_inputs; i++) {
struct mars_input *input = brick->inputs[i];
if (!input)
continue;
status = mars_disconnect(input);
if (unlikely(status < 0)) {
failed = true;
MARS_ERR("brick '%s' '%s' disconnect %d failed, status = %d\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path), i, status);
}
}
if (failed)
goto done;
if (likely(brick->free)) {
status = brick->free(brick);
if (unlikely(status < 0)) {
MARS_ERR("freeing '%s' '%s' failed, status = %d\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path), status);
goto done;
}
} else {
MARS_ERR("brick '%s' '%s' has no destructor\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path));
}
status = 0;
} else {
MARS_ERR("brick '%s' '%s' is not off\n", SAFE_STR(brick->brick_name), SAFE_STR(brick->brick_path));
status = -EUCLEAN;
}
done:
return status;
}
EXPORT_SYMBOL_GPL(mars_kill_brick);
int mars_kill_brick_all(struct mars_global *global, struct list_head *anchor, bool use_dent_link)
{
int status = 0;
if (!anchor || !anchor->next)
goto done;
if (global) {
down_write(&global->brick_mutex);
}
while (!list_empty(anchor)) {
struct list_head *tmp = anchor->next;
struct mars_brick *brick;
if (use_dent_link) {
brick = container_of(tmp, struct mars_brick, dent_brick_link);
} else {
brick = container_of(tmp, struct mars_brick, global_brick_link);
}
list_del_init(tmp);
if (global) {
up_write(&global->brick_mutex);
}
status |= mars_kill_brick(brick);
if (global) {
down_write(&global->brick_mutex);
}
}
if (global) {
up_write(&global->brick_mutex);
}
done:
return status;
}
EXPORT_SYMBOL_GPL(mars_kill_brick_all);
int mars_kill_brick_when_possible(struct mars_global *global, struct list_head *anchor, bool use_dent_link, const struct mars_brick_type *type, bool even_on)
{
int return_status = 0;
struct list_head *tmp;
restart:
if (global) {
down_write(&global->brick_mutex);
}
for (tmp = anchor->next; tmp != anchor; tmp = tmp->next) {
struct mars_brick *brick;
int count;
int status;
if (use_dent_link) {
brick = container_of(tmp, struct mars_brick, dent_brick_link);
} else {
brick = container_of(tmp, struct mars_brick, global_brick_link);
}
// only kill the right brick types
if (type && brick->type != type) {
continue;
}
// only kill marked bricks
if (!brick->killme) {
continue;
}
// only kill unconnected bricks
if (brick->nr_outputs > 0 && brick->outputs[0] && brick->outputs[0]->nr_connected > 0) {
continue;
}
if (!even_on && (brick->power.button || !brick->power.led_off)) {
continue;
}
// only kill bricks which have no resources allocated
count = atomic_read(&brick->mref_object_layout.alloc_count);
if (count > 0)
continue;
/* Workaround FIXME:
* only kill bricks which have not been touched during the current mars_dent_work() round.
* some bricks like aio seem to have races between startup and termination of threads.
* disable this for stress-testing the allocation/deallocation logic.
* OTOH, frequently doing useless starts/stops is no good idea.
* CHECK: how to avoid too frequent switching by other means?
*/
if (brick->kill_round++ < 1) {
continue;
}
list_del_init(tmp);
if (global) {
up_write(&global->brick_mutex);
}
MARS_DBG("KILLING '%s'\n", brick->brick_name);
status = mars_kill_brick(brick);
if (status >= 0) {
return_status++;
} else {
return status;
}
/* The list may have changed during the open lock
* in unpredictable ways.
*/
goto restart;
}
if (global) {
up_write(&global->brick_mutex);
}
return return_status;
}
EXPORT_SYMBOL_GPL(mars_kill_brick_when_possible);
/////////////////////////////////////////////////////////////////////
// mid-level brick instantiation (identity is based on path strings)
char *_vpath_make(int line, const char *fmt, va_list *args)
{
va_list copy_args;
char dummy[2];
int len;
char *res;
memcpy(&copy_args, args, sizeof(copy_args));
len = vsnprintf(dummy, sizeof(dummy), fmt, copy_args);
len = _length_paranoia(len, line);
res = _brick_string_alloc(len + 2, line);
vsnprintf(res, len + 1, fmt, *args);
return res;
}
EXPORT_SYMBOL_GPL(_vpath_make);
char *_path_make(int line, const char *fmt, ...)
{
va_list args;
char *res;
va_start(args, fmt);
res = _vpath_make(line, fmt, &args);
va_end(args);
return res;
}
EXPORT_SYMBOL_GPL(_path_make);
char *_backskip_replace(int line, const char *path, char delim, bool insert, const char *fmt, ...)
{
int path_len = strlen(path);
int fmt_len;
int total_len;
char *res;
va_list args;
int pos = path_len;
int plus;
char dummy[2];
va_start(args, fmt);
fmt_len = vsnprintf(dummy, sizeof(dummy), fmt, args);
va_end(args);
fmt_len = _length_paranoia(fmt_len, line);
total_len = fmt_len + path_len;
total_len = _length_paranoia(total_len, line);
res = _brick_string_alloc(total_len + 2, line);
while (pos > 0 && path[pos] != '/') {
pos--;
}
if (delim != '/') {
while (pos < path_len && path[pos] != delim) {
pos++;
}
}
memcpy(res, path, pos);
va_start(args, fmt);
plus = vscnprintf(res + pos, total_len - pos, fmt, args);
va_end(args);
if (insert) {
strncpy(res + pos + plus, path + pos + 1, total_len - pos - plus);
}
return res;
}
EXPORT_SYMBOL_GPL(_backskip_replace);
struct mars_brick *path_find_brick(struct mars_global *global, const void *brick_type, const char *fmt, ...)
{
va_list args;
char *fullpath;
struct mars_brick *res;
va_start(args, fmt);
fullpath = vpath_make(fmt, &args);
va_end(args);
if (!fullpath) {
return NULL;
}
res = mars_find_brick(global, brick_type, fullpath);
brick_string_free(fullpath);
MARS_IO("search for '%s' found = %p\n", fullpath, res);
return res;
}
EXPORT_SYMBOL_GPL(path_find_brick);
const struct generic_brick_type *_client_brick_type = NULL;
EXPORT_SYMBOL_GPL(_client_brick_type);
const struct generic_brick_type *_bio_brick_type = NULL;
EXPORT_SYMBOL_GPL(_bio_brick_type);
const struct generic_brick_type *_aio_brick_type = NULL;
EXPORT_SYMBOL_GPL(_aio_brick_type);
const struct generic_brick_type *_sio_brick_type = NULL;
EXPORT_SYMBOL_GPL(_sio_brick_type);
struct mars_brick *make_brick_all(
struct mars_global *global,
struct mars_dent *belongs,
int (*setup_fn)(struct mars_brick *brick, void *private),
void *private,
const char *new_name,
const struct generic_brick_type *new_brick_type,
const struct generic_brick_type *prev_brick_type[],
int switch_override, // -1 = off, 0 = leave in current state, +1 = create when necessary, +2 = create + switch on
const char *new_fmt,
const char *prev_fmt[],
int prev_count,
...
)
{
va_list args;
const char *new_path;
char *_new_path = NULL;
struct mars_brick *brick = NULL;
char *paths[prev_count];
struct mars_brick *prev[prev_count];
bool switch_state;
int i;
int status;
// treat variable arguments
va_start(args, prev_count);
if (new_fmt) {
new_path = _new_path = vpath_make(new_fmt, &args);
} else {
new_path = new_name;
}
for (i = 0; i < prev_count; i++) {
paths[i] = vpath_make(prev_fmt[i], &args);
}
va_end(args);
if (!new_path) {
MARS_ERR("could not create new path\n");
goto err;
}
// get old switch state
brick = mars_find_brick(global, NULL, new_path);
switch_state = false;
if (brick) {
switch_state = brick->power.button;
}
// override?
if (switch_override > 1)
switch_state = true;
else if (switch_override < 0)
switch_state = false;
// even higher override
if (global && !global->global_power.button) {
switch_state = false;
}
// brick already existing?
if (brick) {
// just switch the power state
MARS_DBG("found existing brick '%s'\n", new_path);
// highest general override
if (mars_check_outputs(brick)) {
if (!switch_state)
MARS_DBG("brick '%s' override 0 -> 1\n", new_path);
switch_state = true;
}
goto do_switch;
}
// brick not existing => check whether to create it
if (switch_override < 1) { // don't create
MARS_DBG("no need for brick '%s'\n", new_path);
goto done;
}
MARS_DBG("make new brick '%s'\n", new_path);
if (!new_name)
new_name = new_path;
MARS_DBG("----> new brick type = '%s' path = '%s' name = '%s'\n", new_brick_type->type_name, new_path, new_name);
// get all predecessor bricks
for (i = 0; i < prev_count; i++) {
char *path = paths[i];
if (!path) {
MARS_ERR("could not build path %d\n", i);
goto err;
}
prev[i] = mars_find_brick(global, NULL, path);
if (!prev[i]) {
MARS_WRN("prev brick '%s' does not exist\n", path);
goto err;
}
MARS_DBG("------> predecessor %d path = '%s'\n", i, path);
if (!prev[i]->power.led_on) {
switch_state = false;
MARS_DBG("predecessor power is not on\n");
}
}
// some generic brick replacements (better performance / network functionality)
brick = NULL;
if ((new_brick_type == _bio_brick_type || new_brick_type == _aio_brick_type)
&& _client_brick_type != NULL) {
char *remote = strchr(new_name, '@');
if (remote) {
remote++;
MARS_DBG("substitute by remote brick '%s' on peer '%s'\n", new_name, remote);
brick = mars_make_brick(global, belongs, _client_brick_type, new_path, new_name);
if (brick) {
struct client_brick *_brick = (void*)brick;
_brick->max_flying = 10000;
}
}
}
if (!brick && new_brick_type == _bio_brick_type && _aio_brick_type) {
struct kstat test = {};
int status = mars_stat(new_path, &test, false);
if (SKIP_BIO || status < 0 || !S_ISBLK(test.mode)) {
new_brick_type = _aio_brick_type;
MARS_DBG("substitute bio by aio\n");
}
}
#ifndef ENABLE_MARS_AIO
if (!brick && new_brick_type == _aio_brick_type && _sio_brick_type) {
new_brick_type = _sio_brick_type;
MARS_DBG("substitute aio by sio\n");
}
#endif
// create it...
if (!brick)
brick = mars_make_brick(global, belongs, new_brick_type, new_path, new_name);
if (unlikely(!brick)) {
MARS_ERR("creation failed '%s' '%s'\n", new_path, new_name);
goto err;
}
if (unlikely(brick->nr_inputs < prev_count)) {
MARS_ERR("'%s' wrong number of arguments: %d < %d\n", new_path, brick->nr_inputs, prev_count);
goto err;
}
// connect the wires
for (i = 0; i < prev_count; i++) {
int status;
status = mars_connect(brick->inputs[i], prev[i]->outputs[0]);
if (unlikely(status < 0)) {
MARS_ERR("'%s' '%s' cannot connect input %d\n", new_path, new_name, i);
goto err;
}
}
do_switch:
// call setup function
if (setup_fn) {
int setup_status = setup_fn(brick, private);
if (setup_status <= 0) {
switch_state = 0;
}
}
// switch on/off (may fail silently, but responsibility is at the workers)
status = mars_power_button((void*)brick, switch_state, false);
MARS_DBG("switch '%s' to %d status = %d\n", new_path, switch_state, status);
goto done;
err:
if (brick) {
mars_kill_brick(brick);
}
brick = NULL;
done:
for (i = 0; i < prev_count; i++) {
if (paths[i]) {
brick_string_free(paths[i]);
}
}
if (_new_path)
brick_string_free(_new_path);
return brick;
}
EXPORT_SYMBOL_GPL(make_brick_all);
/////////////////////////////////////////////////////////////////////////
// generic symlink updates
void update_client_links(struct client_brick *brick)
{
char val[8];
const char *name;
name = backskip_replace(brick->brick_path, '/', true, "/local-%s/connection-", my_id());
if (unlikely(!name))
return; // silently
sprintf(val, "%d", brick->connection_state - 1);
mars_symlink(val, name, NULL, 0);
brick_string_free(name);
}
/////////////////////////////////////////////////////////////////////////
// statistics
int global_show_statist =
#ifdef CONFIG_MARS_DEBUG_DEFAULT
1;
#else
0;
#endif
EXPORT_SYMBOL_GPL(global_show_statist);
int global_show_connections =
#ifdef CONFIG_MARS_SHOW_CONNECTIONS
1;
#else
0;
#endif
EXPORT_SYMBOL_GPL(global_show_connections);
static
void _show_one(struct mars_brick *test, int *brick_count)
{
int i;
if (*brick_count) {
MARS_STAT("---------\n");
}
MARS_STAT("BRICK type = %s path = '%s' name = '%s' "
"create_stamp = %ld.%09ld "
"size_hint=%d "
"mrefs_alloc = %d "
"mrefs_apsect_alloc = %d "
"total_mrefs_alloc = %d "
"total_mrefs_aspects = %d "
"killme = %d "
"button = %d off = %d on = %d\n",
SAFE_STR(test->type->type_name),
SAFE_STR(test->brick_path),
SAFE_STR(test->brick_name),
test->create_stamp.tv_sec, test->create_stamp.tv_nsec,
test->mref_object_layout.size_hint,
atomic_read(&test->mref_object_layout.alloc_count),
atomic_read(&test->mref_object_layout.aspect_count),
atomic_read(&test->mref_object_layout.total_alloc_count),
atomic_read(&test->mref_object_layout.total_aspect_count),
test->killme,
test->power.button,
test->power.led_off,
test->power.led_on);
(*brick_count)++;
if (test->ops && test->ops->brick_statistics) {
char *info = test->ops->brick_statistics(test, 0);
if (info) {
MARS_STAT(" %s", info);
brick_string_free(info);
}
}
for (i = 0; i < test->type->max_inputs; i++) {
struct mars_input *input = test->inputs[i];
struct mars_output *output = input ? input->connect : NULL;
if (output) {
MARS_STAT(" input %d connected with %s path = '%s' name = '%s'\n", i, SAFE_STR(output->brick->type->type_name), SAFE_STR(output->brick->brick_path), SAFE_STR(output->brick->brick_name));
} else {
MARS_STAT(" input %d not connected\n", i);
}
}
for (i = 0; i < test->type->max_outputs; i++) {
struct mars_output *output = test->outputs[i];
if (output) {
MARS_STAT(" output %d nr_connected = %d\n", i, output->nr_connected);
}
}
}
void show_statistics(struct mars_global *global, const char *class)
{
struct list_head *tmp;
int dent_count = 0;
int brick_count = 0;
// update all connection state symlinks
if (global_show_connections) {
down_read(&global->brick_mutex);
for (tmp = global->brick_anchor.next; tmp != &global->brick_anchor; tmp = tmp->next) {
struct mars_brick *test;
test = container_of(tmp, struct mars_brick, global_brick_link);
if (test->type == (void*)&client_brick_type) {
update_client_links((void*)test);
}
}
up_read(&global->brick_mutex);
}
if (!global_show_statist)
return; // silently
brick_mem_statistics(false);
down_read(&global->brick_mutex);
MARS_STAT("================================== %s bricks:\n", class);
for (tmp = global->brick_anchor.next; tmp != &global->brick_anchor; tmp = tmp->next) {
struct mars_brick *test;
test = container_of(tmp, struct mars_brick, global_brick_link);
_show_one(test, &brick_count);
}
up_read(&global->brick_mutex);
MARS_STAT("================================== %s dents:\n", class);
down_read(&global->dent_mutex);
for (tmp = global->dent_anchor.next; tmp != &global->dent_anchor; tmp = tmp->next) {
struct mars_dent *dent;
struct list_head *sub;
dent = container_of(tmp, struct mars_dent, dent_link);
MARS_STAT("dent %d '%s' '%s' stamp=%ld.%09ld\n", dent->d_class, SAFE_STR(dent->d_path), SAFE_STR(dent->new_link), dent->new_stat.mtime.tv_sec, dent->new_stat.mtime.tv_nsec);
dent_count++;
for (sub = dent->brick_list.next; sub != &dent->brick_list; sub = sub->next) {
struct mars_brick *test;
test = container_of(sub, struct mars_brick, dent_brick_link);
MARS_STAT(" owner of brick '%s'\n", SAFE_STR(test->brick_path));
}
}
up_read(&global->dent_mutex);
MARS_STAT("==================== %s STATISTICS: %d dents, %d bricks, %lld KB free\n", class, dent_count, brick_count, global_remaining_space);
}
EXPORT_SYMBOL_GPL(show_statistics);
/////////////////////////////////////////////////////////////////////
// init stuff
int __init init_sy(void)
{
MARS_INF("init_sy()\n");
_mars_trigger = __mars_trigger;
return 0;
}
void exit_sy(void)
{
MARS_INF("exit_sy()\n");
}
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