mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Alexey Dobriyan](/assets/img/avatar_default.png)
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>
421 lines
9.9 KiB
C
421 lines
9.9 KiB
C
/*
|
|
* linux/fs/nfsd/nfs4recover.c
|
|
*
|
|
* Copyright (c) 2004 The Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Andy Adamson <andros@citi.umich.edu>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/sunrpc/svc.h>
|
|
#include <linux/nfsd/nfsd.h>
|
|
#include <linux/nfs4.h>
|
|
#include <linux/nfsd/state.h>
|
|
#include <linux/nfsd/xdr4.h>
|
|
#include <linux/param.h>
|
|
#include <linux/file.h>
|
|
#include <linux/namei.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/scatterlist.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/sched.h>
|
|
|
|
#define NFSDDBG_FACILITY NFSDDBG_PROC
|
|
|
|
/* Globals */
|
|
static struct nameidata rec_dir;
|
|
static int rec_dir_init = 0;
|
|
|
|
static void
|
|
nfs4_save_user(uid_t *saveuid, gid_t *savegid)
|
|
{
|
|
*saveuid = current->fsuid;
|
|
*savegid = current->fsgid;
|
|
current->fsuid = 0;
|
|
current->fsgid = 0;
|
|
}
|
|
|
|
static void
|
|
nfs4_reset_user(uid_t saveuid, gid_t savegid)
|
|
{
|
|
current->fsuid = saveuid;
|
|
current->fsgid = savegid;
|
|
}
|
|
|
|
static void
|
|
md5_to_hex(char *out, char *md5)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i<16; i++) {
|
|
unsigned char c = md5[i];
|
|
|
|
*out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
|
|
*out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
|
|
}
|
|
*out = '\0';
|
|
}
|
|
|
|
__be32
|
|
nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
|
|
{
|
|
struct xdr_netobj cksum;
|
|
struct hash_desc desc;
|
|
struct scatterlist sg[1];
|
|
__be32 status = nfserr_resource;
|
|
|
|
dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
|
|
clname->len, clname->data);
|
|
desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
|
|
desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(desc.tfm))
|
|
goto out_no_tfm;
|
|
cksum.len = crypto_hash_digestsize(desc.tfm);
|
|
cksum.data = kmalloc(cksum.len, GFP_KERNEL);
|
|
if (cksum.data == NULL)
|
|
goto out;
|
|
|
|
sg[0].page = virt_to_page(clname->data);
|
|
sg[0].offset = offset_in_page(clname->data);
|
|
sg[0].length = clname->len;
|
|
|
|
if (crypto_hash_digest(&desc, sg, sg->length, cksum.data))
|
|
goto out;
|
|
|
|
md5_to_hex(dname, cksum.data);
|
|
|
|
kfree(cksum.data);
|
|
status = nfs_ok;
|
|
out:
|
|
crypto_free_hash(desc.tfm);
|
|
out_no_tfm:
|
|
return status;
|
|
}
|
|
|
|
static void
|
|
nfsd4_sync_rec_dir(void)
|
|
{
|
|
mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
|
|
nfsd_sync_dir(rec_dir.dentry);
|
|
mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
|
|
}
|
|
|
|
int
|
|
nfsd4_create_clid_dir(struct nfs4_client *clp)
|
|
{
|
|
char *dname = clp->cl_recdir;
|
|
struct dentry *dentry;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
int status;
|
|
|
|
dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
|
|
|
|
if (!rec_dir_init || clp->cl_firststate)
|
|
return 0;
|
|
|
|
nfs4_save_user(&uid, &gid);
|
|
|
|
/* lock the parent */
|
|
mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
|
|
|
|
dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
|
|
if (IS_ERR(dentry)) {
|
|
status = PTR_ERR(dentry);
|
|
goto out_unlock;
|
|
}
|
|
status = -EEXIST;
|
|
if (dentry->d_inode) {
|
|
dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
|
|
goto out_put;
|
|
}
|
|
status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
|
|
out_put:
|
|
dput(dentry);
|
|
out_unlock:
|
|
mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
|
|
if (status == 0) {
|
|
clp->cl_firststate = 1;
|
|
nfsd4_sync_rec_dir();
|
|
}
|
|
nfs4_reset_user(uid, gid);
|
|
dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
typedef int (recdir_func)(struct dentry *, struct dentry *);
|
|
|
|
struct dentry_list {
|
|
struct dentry *dentry;
|
|
struct list_head list;
|
|
};
|
|
|
|
struct dentry_list_arg {
|
|
struct list_head dentries;
|
|
struct dentry *parent;
|
|
};
|
|
|
|
static int
|
|
nfsd4_build_dentrylist(void *arg, const char *name, int namlen,
|
|
loff_t offset, u64 ino, unsigned int d_type)
|
|
{
|
|
struct dentry_list_arg *dla = arg;
|
|
struct list_head *dentries = &dla->dentries;
|
|
struct dentry *parent = dla->parent;
|
|
struct dentry *dentry;
|
|
struct dentry_list *child;
|
|
|
|
if (name && isdotent(name, namlen))
|
|
return 0;
|
|
dentry = lookup_one_len(name, parent, namlen);
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
child = kmalloc(sizeof(*child), GFP_KERNEL);
|
|
if (child == NULL)
|
|
return -ENOMEM;
|
|
child->dentry = dentry;
|
|
list_add(&child->list, dentries);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
|
|
{
|
|
struct file *filp;
|
|
struct dentry_list_arg dla = {
|
|
.parent = dir,
|
|
};
|
|
struct list_head *dentries = &dla.dentries;
|
|
struct dentry_list *child;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
int status;
|
|
|
|
if (!rec_dir_init)
|
|
return 0;
|
|
|
|
nfs4_save_user(&uid, &gid);
|
|
|
|
filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
|
|
status = PTR_ERR(filp);
|
|
if (IS_ERR(filp))
|
|
goto out;
|
|
INIT_LIST_HEAD(dentries);
|
|
status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla);
|
|
fput(filp);
|
|
while (!list_empty(dentries)) {
|
|
child = list_entry(dentries->next, struct dentry_list, list);
|
|
status = f(dir, child->dentry);
|
|
if (status)
|
|
goto out;
|
|
list_del(&child->list);
|
|
dput(child->dentry);
|
|
kfree(child);
|
|
}
|
|
out:
|
|
while (!list_empty(dentries)) {
|
|
child = list_entry(dentries->next, struct dentry_list, list);
|
|
list_del(&child->list);
|
|
dput(child->dentry);
|
|
kfree(child);
|
|
}
|
|
nfs4_reset_user(uid, gid);
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry)
|
|
{
|
|
int status;
|
|
|
|
if (!S_ISREG(dir->d_inode->i_mode)) {
|
|
printk("nfsd4: non-file found in client recovery directory\n");
|
|
return -EINVAL;
|
|
}
|
|
mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
|
|
status = vfs_unlink(dir->d_inode, dentry);
|
|
mutex_unlock(&dir->d_inode->i_mutex);
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry)
|
|
{
|
|
int status;
|
|
|
|
/* For now this directory should already be empty, but we empty it of
|
|
* any regular files anyway, just in case the directory was created by
|
|
* a kernel from the future.... */
|
|
nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
|
|
mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
|
|
status = vfs_rmdir(dir->d_inode, dentry);
|
|
mutex_unlock(&dir->d_inode->i_mutex);
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
nfsd4_unlink_clid_dir(char *name, int namlen)
|
|
{
|
|
struct dentry *dentry;
|
|
int status;
|
|
|
|
dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
|
|
|
|
mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
|
|
dentry = lookup_one_len(name, rec_dir.dentry, namlen);
|
|
mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
|
|
if (IS_ERR(dentry)) {
|
|
status = PTR_ERR(dentry);
|
|
return status;
|
|
}
|
|
status = -ENOENT;
|
|
if (!dentry->d_inode)
|
|
goto out;
|
|
|
|
status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
|
|
out:
|
|
dput(dentry);
|
|
return status;
|
|
}
|
|
|
|
void
|
|
nfsd4_remove_clid_dir(struct nfs4_client *clp)
|
|
{
|
|
uid_t uid;
|
|
gid_t gid;
|
|
int status;
|
|
|
|
if (!rec_dir_init || !clp->cl_firststate)
|
|
return;
|
|
|
|
clp->cl_firststate = 0;
|
|
nfs4_save_user(&uid, &gid);
|
|
status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
|
|
nfs4_reset_user(uid, gid);
|
|
if (status == 0)
|
|
nfsd4_sync_rec_dir();
|
|
if (status)
|
|
printk("NFSD: Failed to remove expired client state directory"
|
|
" %.*s\n", HEXDIR_LEN, clp->cl_recdir);
|
|
return;
|
|
}
|
|
|
|
static int
|
|
purge_old(struct dentry *parent, struct dentry *child)
|
|
{
|
|
int status;
|
|
|
|
if (nfs4_has_reclaimed_state(child->d_name.name))
|
|
return 0;
|
|
|
|
status = nfsd4_clear_clid_dir(parent, child);
|
|
if (status)
|
|
printk("failed to remove client recovery directory %s\n",
|
|
child->d_name.name);
|
|
/* Keep trying, success or failure: */
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
nfsd4_recdir_purge_old(void) {
|
|
int status;
|
|
|
|
if (!rec_dir_init)
|
|
return;
|
|
status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
|
|
if (status == 0)
|
|
nfsd4_sync_rec_dir();
|
|
if (status)
|
|
printk("nfsd4: failed to purge old clients from recovery"
|
|
" directory %s\n", rec_dir.dentry->d_name.name);
|
|
return;
|
|
}
|
|
|
|
static int
|
|
load_recdir(struct dentry *parent, struct dentry *child)
|
|
{
|
|
if (child->d_name.len != HEXDIR_LEN - 1) {
|
|
printk("nfsd4: illegal name %s in recovery directory\n",
|
|
child->d_name.name);
|
|
/* Keep trying; maybe the others are OK: */
|
|
return 0;
|
|
}
|
|
nfs4_client_to_reclaim(child->d_name.name);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
nfsd4_recdir_load(void) {
|
|
int status;
|
|
|
|
status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
|
|
if (status)
|
|
printk("nfsd4: failed loading clients from recovery"
|
|
" directory %s\n", rec_dir.dentry->d_name.name);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Hold reference to the recovery directory.
|
|
*/
|
|
|
|
void
|
|
nfsd4_init_recdir(char *rec_dirname)
|
|
{
|
|
uid_t uid = 0;
|
|
gid_t gid = 0;
|
|
int status;
|
|
|
|
printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
|
|
rec_dirname);
|
|
|
|
BUG_ON(rec_dir_init);
|
|
|
|
nfs4_save_user(&uid, &gid);
|
|
|
|
status = path_lookup(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
|
|
&rec_dir);
|
|
if (status)
|
|
printk("NFSD: unable to find recovery directory %s\n",
|
|
rec_dirname);
|
|
|
|
if (!status)
|
|
rec_dir_init = 1;
|
|
nfs4_reset_user(uid, gid);
|
|
}
|
|
|
|
void
|
|
nfsd4_shutdown_recdir(void)
|
|
{
|
|
if (!rec_dir_init)
|
|
return;
|
|
rec_dir_init = 0;
|
|
path_release(&rec_dir);
|
|
}
|