/usr/src/aufs-4.9+20161219/fs/aufs/cpup.c is in aufs-dkms 4.9+20161219-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2005-2016 Junjiro R. Okajima
*
* This program, aufs 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, see <http://www.gnu.org/licenses/>.
*/
/*
* copy-up functions, see wbr_policy.c for copy-down
*/
#include <linux/fs_stack.h>
#include <linux/mm.h>
#include <linux/task_work.h>
#include "aufs.h"
void au_cpup_attr_flags(struct inode *dst, unsigned int iflags)
{
const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE
| S_NOATIME | S_NOCMTIME | S_AUTOMOUNT;
BUILD_BUG_ON(sizeof(iflags) != sizeof(dst->i_flags));
dst->i_flags |= iflags & ~mask;
if (au_test_fs_notime(dst->i_sb))
dst->i_flags |= S_NOATIME | S_NOCMTIME;
}
void au_cpup_attr_timesizes(struct inode *inode)
{
struct inode *h_inode;
h_inode = au_h_iptr(inode, au_ibtop(inode));
fsstack_copy_attr_times(inode, h_inode);
fsstack_copy_inode_size(inode, h_inode);
}
void au_cpup_attr_nlink(struct inode *inode, int force)
{
struct inode *h_inode;
struct super_block *sb;
aufs_bindex_t bindex, bbot;
sb = inode->i_sb;
bindex = au_ibtop(inode);
h_inode = au_h_iptr(inode, bindex);
if (!force
&& !S_ISDIR(h_inode->i_mode)
&& au_opt_test(au_mntflags(sb), PLINK)
&& au_plink_test(inode))
return;
/*
* 0 can happen in revalidating.
* h_inode->i_mutex may not be held here, but it is harmless since once
* i_nlink reaches 0, it will never become positive except O_TMPFILE
* case.
* todo: O_TMPFILE+linkat(AT_SYMLINK_FOLLOW) bypassing aufs may cause
* the incorrect link count.
*/
set_nlink(inode, h_inode->i_nlink);
/*
* fewer nlink makes find(1) noisy, but larger nlink doesn't.
* it may includes whplink directory.
*/
if (S_ISDIR(h_inode->i_mode)) {
bbot = au_ibbot(inode);
for (bindex++; bindex <= bbot; bindex++) {
h_inode = au_h_iptr(inode, bindex);
if (h_inode)
au_add_nlink(inode, h_inode);
}
}
}
void au_cpup_attr_changeable(struct inode *inode)
{
struct inode *h_inode;
h_inode = au_h_iptr(inode, au_ibtop(inode));
inode->i_mode = h_inode->i_mode;
inode->i_uid = h_inode->i_uid;
inode->i_gid = h_inode->i_gid;
au_cpup_attr_timesizes(inode);
au_cpup_attr_flags(inode, h_inode->i_flags);
}
void au_cpup_igen(struct inode *inode, struct inode *h_inode)
{
struct au_iinfo *iinfo = au_ii(inode);
IiMustWriteLock(inode);
iinfo->ii_higen = h_inode->i_generation;
iinfo->ii_hsb1 = h_inode->i_sb;
}
void au_cpup_attr_all(struct inode *inode, int force)
{
struct inode *h_inode;
h_inode = au_h_iptr(inode, au_ibtop(inode));
au_cpup_attr_changeable(inode);
if (inode->i_nlink > 0)
au_cpup_attr_nlink(inode, force);
inode->i_rdev = h_inode->i_rdev;
inode->i_blkbits = h_inode->i_blkbits;
au_cpup_igen(inode, h_inode);
}
/* ---------------------------------------------------------------------- */
/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */
/* keep the timestamps of the parent dir when cpup */
void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
struct path *h_path)
{
struct inode *h_inode;
dt->dt_dentry = dentry;
dt->dt_h_path = *h_path;
h_inode = d_inode(h_path->dentry);
dt->dt_atime = h_inode->i_atime;
dt->dt_mtime = h_inode->i_mtime;
/* smp_mb(); */
}
void au_dtime_revert(struct au_dtime *dt)
{
struct iattr attr;
int err;
attr.ia_atime = dt->dt_atime;
attr.ia_mtime = dt->dt_mtime;
attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
| ATTR_ATIME | ATTR_ATIME_SET;
/* no delegation since this is a directory */
err = vfsub_notify_change(&dt->dt_h_path, &attr, /*delegated*/NULL);
if (unlikely(err))
pr_warn("restoring timestamps failed(%d). ignored\n", err);
}
/* ---------------------------------------------------------------------- */
/* internal use only */
struct au_cpup_reg_attr {
int valid;
struct kstat st;
unsigned int iflags; /* inode->i_flags */
};
static noinline_for_stack
int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src,
struct au_cpup_reg_attr *h_src_attr)
{
int err, sbits, icex;
unsigned int mnt_flags;
unsigned char verbose;
struct iattr ia;
struct path h_path;
struct inode *h_isrc, *h_idst;
struct kstat *h_st;
struct au_branch *br;
h_path.dentry = au_h_dptr(dst, bindex);
h_idst = d_inode(h_path.dentry);
br = au_sbr(dst->d_sb, bindex);
h_path.mnt = au_br_mnt(br);
h_isrc = d_inode(h_src);
ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID
| ATTR_ATIME | ATTR_MTIME
| ATTR_ATIME_SET | ATTR_MTIME_SET;
if (h_src_attr && h_src_attr->valid) {
h_st = &h_src_attr->st;
ia.ia_uid = h_st->uid;
ia.ia_gid = h_st->gid;
ia.ia_atime = h_st->atime;
ia.ia_mtime = h_st->mtime;
if (h_idst->i_mode != h_st->mode
&& !S_ISLNK(h_idst->i_mode)) {
ia.ia_valid |= ATTR_MODE;
ia.ia_mode = h_st->mode;
}
sbits = !!(h_st->mode & (S_ISUID | S_ISGID));
au_cpup_attr_flags(h_idst, h_src_attr->iflags);
} else {
ia.ia_uid = h_isrc->i_uid;
ia.ia_gid = h_isrc->i_gid;
ia.ia_atime = h_isrc->i_atime;
ia.ia_mtime = h_isrc->i_mtime;
if (h_idst->i_mode != h_isrc->i_mode
&& !S_ISLNK(h_idst->i_mode)) {
ia.ia_valid |= ATTR_MODE;
ia.ia_mode = h_isrc->i_mode;
}
sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID));
au_cpup_attr_flags(h_idst, h_isrc->i_flags);
}
/* no delegation since it is just created */
err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL);
/* is this nfs only? */
if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) {
ia.ia_valid = ATTR_FORCE | ATTR_MODE;
ia.ia_mode = h_isrc->i_mode;
err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL);
}
icex = br->br_perm & AuBrAttr_ICEX;
if (!err) {
mnt_flags = au_mntflags(dst->d_sb);
verbose = !!au_opt_test(mnt_flags, VERBOSE);
err = au_cpup_xattr(h_path.dentry, h_src, icex, verbose);
}
return err;
}
/* ---------------------------------------------------------------------- */
static int au_do_copy_file(struct file *dst, struct file *src, loff_t len,
char *buf, unsigned long blksize)
{
int err;
size_t sz, rbytes, wbytes;
unsigned char all_zero;
char *p, *zp;
struct inode *h_inode;
/* reduce stack usage */
struct iattr *ia;
zp = page_address(ZERO_PAGE(0));
if (unlikely(!zp))
return -ENOMEM; /* possible? */
err = 0;
all_zero = 0;
while (len) {
AuDbg("len %lld\n", len);
sz = blksize;
if (len < blksize)
sz = len;
rbytes = 0;
/* todo: signal_pending? */
while (!rbytes || err == -EAGAIN || err == -EINTR) {
rbytes = vfsub_read_k(src, buf, sz, &src->f_pos);
err = rbytes;
}
if (unlikely(err < 0))
break;
all_zero = 0;
if (len >= rbytes && rbytes == blksize)
all_zero = !memcmp(buf, zp, rbytes);
if (!all_zero) {
wbytes = rbytes;
p = buf;
while (wbytes) {
size_t b;
b = vfsub_write_k(dst, p, wbytes, &dst->f_pos);
err = b;
/* todo: signal_pending? */
if (unlikely(err == -EAGAIN || err == -EINTR))
continue;
if (unlikely(err < 0))
break;
wbytes -= b;
p += b;
}
if (unlikely(err < 0))
break;
} else {
loff_t res;
AuLabel(hole);
res = vfsub_llseek(dst, rbytes, SEEK_CUR);
err = res;
if (unlikely(res < 0))
break;
}
len -= rbytes;
err = 0;
}
/* the last block may be a hole */
if (!err && all_zero) {
AuLabel(last hole);
err = 1;
if (au_test_nfs(dst->f_path.dentry->d_sb)) {
/* nfs requires this step to make last hole */
/* is this only nfs? */
do {
/* todo: signal_pending? */
err = vfsub_write_k(dst, "\0", 1, &dst->f_pos);
} while (err == -EAGAIN || err == -EINTR);
if (err == 1)
dst->f_pos--;
}
if (err == 1) {
ia = (void *)buf;
ia->ia_size = dst->f_pos;
ia->ia_valid = ATTR_SIZE | ATTR_FILE;
ia->ia_file = dst;
h_inode = file_inode(dst);
inode_lock_nested(h_inode, AuLsc_I_CHILD2);
/* no delegation since it is just created */
err = vfsub_notify_change(&dst->f_path, ia,
/*delegated*/NULL);
inode_unlock(h_inode);
}
}
return err;
}
int au_copy_file(struct file *dst, struct file *src, loff_t len)
{
int err;
unsigned long blksize;
unsigned char do_kfree;
char *buf;
err = -ENOMEM;
blksize = dst->f_path.dentry->d_sb->s_blocksize;
if (!blksize || PAGE_SIZE < blksize)
blksize = PAGE_SIZE;
AuDbg("blksize %lu\n", blksize);
do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *));
if (do_kfree)
buf = kmalloc(blksize, GFP_NOFS);
else
buf = (void *)__get_free_page(GFP_NOFS);
if (unlikely(!buf))
goto out;
if (len > (1 << 22))
AuDbg("copying a large file %lld\n", (long long)len);
src->f_pos = 0;
dst->f_pos = 0;
err = au_do_copy_file(dst, src, len, buf, blksize);
if (do_kfree)
au_delayed_kfree(buf);
else
au_delayed_free_page((unsigned long)buf);
out:
return err;
}
/*
* to support a sparse file which is opened with O_APPEND,
* we need to close the file.
*/
static int au_cp_regular(struct au_cp_generic *cpg)
{
int err, i;
enum { SRC, DST };
struct {
aufs_bindex_t bindex;
unsigned int flags;
struct dentry *dentry;
int force_wr;
struct file *file;
void *label;
} *f, file[] = {
{
.bindex = cpg->bsrc,
.flags = O_RDONLY | O_NOATIME | O_LARGEFILE,
.label = &&out
},
{
.bindex = cpg->bdst,
.flags = O_WRONLY | O_NOATIME | O_LARGEFILE,
.force_wr = !!au_ftest_cpup(cpg->flags, RWDST),
.label = &&out_src
}
};
struct super_block *sb;
struct inode *h_src_inode;
struct task_struct *tsk = current;
/* bsrc branch can be ro/rw. */
sb = cpg->dentry->d_sb;
f = file;
for (i = 0; i < 2; i++, f++) {
f->dentry = au_h_dptr(cpg->dentry, f->bindex);
f->file = au_h_open(cpg->dentry, f->bindex, f->flags,
/*file*/NULL, f->force_wr);
err = PTR_ERR(f->file);
if (IS_ERR(f->file))
goto *f->label;
}
/* try stopping to update while we copyup */
h_src_inode = d_inode(file[SRC].dentry);
if (!au_test_nfs(h_src_inode->i_sb))
IMustLock(h_src_inode);
err = au_copy_file(file[DST].file, file[SRC].file, cpg->len);
/* i wonder if we had O_NO_DELAY_FPUT flag */
if (tsk->flags & PF_KTHREAD)
__fput_sync(file[DST].file);
else {
WARN(1, "%pD\nPlease report this warning to aufs-users ML",
file[DST].file);
fput(file[DST].file);
/*
* too bad.
* we have to call both since we don't know which place the file
* was added to.
*/
task_work_run();
flush_delayed_fput();
}
au_sbr_put(sb, file[DST].bindex);
out_src:
fput(file[SRC].file);
au_sbr_put(sb, file[SRC].bindex);
out:
return err;
}
static int au_do_cpup_regular(struct au_cp_generic *cpg,
struct au_cpup_reg_attr *h_src_attr)
{
int err, rerr;
loff_t l;
struct path h_path;
struct inode *h_src_inode, *h_dst_inode;
err = 0;
h_src_inode = au_h_iptr(d_inode(cpg->dentry), cpg->bsrc);
l = i_size_read(h_src_inode);
if (cpg->len == -1 || l < cpg->len)
cpg->len = l;
if (cpg->len) {
/* try stopping to update while we are referencing */
inode_lock_nested(h_src_inode, AuLsc_I_CHILD);
au_pin_hdir_unlock(cpg->pin);
h_path.dentry = au_h_dptr(cpg->dentry, cpg->bsrc);
h_path.mnt = au_sbr_mnt(cpg->dentry->d_sb, cpg->bsrc);
h_src_attr->iflags = h_src_inode->i_flags;
if (!au_test_nfs(h_src_inode->i_sb))
err = vfs_getattr(&h_path, &h_src_attr->st);
else {
inode_unlock(h_src_inode);
err = vfs_getattr(&h_path, &h_src_attr->st);
inode_lock_nested(h_src_inode, AuLsc_I_CHILD);
}
if (unlikely(err)) {
inode_unlock(h_src_inode);
goto out;
}
h_src_attr->valid = 1;
if (!au_test_nfs(h_src_inode->i_sb)) {
err = au_cp_regular(cpg);
inode_unlock(h_src_inode);
} else {
inode_unlock(h_src_inode);
err = au_cp_regular(cpg);
}
rerr = au_pin_hdir_relock(cpg->pin);
if (!err && rerr)
err = rerr;
}
if (!err && (h_src_inode->i_state & I_LINKABLE)) {
h_path.dentry = au_h_dptr(cpg->dentry, cpg->bdst);
h_dst_inode = d_inode(h_path.dentry);
spin_lock(&h_dst_inode->i_lock);
h_dst_inode->i_state |= I_LINKABLE;
spin_unlock(&h_dst_inode->i_lock);
}
out:
return err;
}
static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src,
struct inode *h_dir)
{
int err, symlen;
mm_segment_t old_fs;
union {
char *k;
char __user *u;
} sym;
struct inode *h_inode = d_inode(h_src);
const struct inode_operations *h_iop = h_inode->i_op;
err = -ENOSYS;
if (unlikely(!h_iop->readlink))
goto out;
err = -ENOMEM;
sym.k = (void *)__get_free_page(GFP_NOFS);
if (unlikely(!sym.k))
goto out;
/* unnecessary to support mmap_sem since symlink is not mmap-able */
old_fs = get_fs();
set_fs(KERNEL_DS);
symlen = h_iop->readlink(h_src, sym.u, PATH_MAX);
err = symlen;
set_fs(old_fs);
if (symlen > 0) {
sym.k[symlen] = 0;
err = vfsub_symlink(h_dir, h_path, sym.k);
}
au_delayed_free_page((unsigned long)sym.k);
out:
return err;
}
/*
* regardless 'acl' option, reset all ACL.
* All ACL will be copied up later from the original entry on the lower branch.
*/
static int au_reset_acl(struct inode *h_dir, struct path *h_path, umode_t mode)
{
int err;
struct dentry *h_dentry;
struct inode *h_inode;
h_dentry = h_path->dentry;
h_inode = d_inode(h_dentry);
/* forget_all_cached_acls(h_inode)); */
err = vfsub_removexattr(h_dentry, XATTR_NAME_POSIX_ACL_ACCESS);
AuTraceErr(err);
if (err == -EOPNOTSUPP)
err = 0;
if (!err)
err = vfsub_acl_chmod(h_inode, mode);
AuTraceErr(err);
return err;
}
static int au_do_cpup_dir(struct au_cp_generic *cpg, struct dentry *dst_parent,
struct inode *h_dir, struct path *h_path)
{
int err;
struct inode *dir, *inode;
err = vfsub_removexattr(h_path->dentry, XATTR_NAME_POSIX_ACL_DEFAULT);
AuTraceErr(err);
if (err == -EOPNOTSUPP)
err = 0;
if (unlikely(err))
goto out;
/*
* strange behaviour from the users view,
* particularry setattr case
*/
dir = d_inode(dst_parent);
if (au_ibtop(dir) == cpg->bdst)
au_cpup_attr_nlink(dir, /*force*/1);
inode = d_inode(cpg->dentry);
au_cpup_attr_nlink(inode, /*force*/1);
out:
return err;
}
static noinline_for_stack
int cpup_entry(struct au_cp_generic *cpg, struct dentry *dst_parent,
struct au_cpup_reg_attr *h_src_attr)
{
int err;
umode_t mode;
unsigned int mnt_flags;
unsigned char isdir, isreg, force;
const unsigned char do_dt = !!au_ftest_cpup(cpg->flags, DTIME);
struct au_dtime dt;
struct path h_path;
struct dentry *h_src, *h_dst, *h_parent;
struct inode *h_inode, *h_dir;
struct super_block *sb;
/* bsrc branch can be ro/rw. */
h_src = au_h_dptr(cpg->dentry, cpg->bsrc);
h_inode = d_inode(h_src);
AuDebugOn(h_inode != au_h_iptr(d_inode(cpg->dentry), cpg->bsrc));
/* try stopping to be referenced while we are creating */
h_dst = au_h_dptr(cpg->dentry, cpg->bdst);
if (au_ftest_cpup(cpg->flags, RENAME))
AuDebugOn(strncmp(h_dst->d_name.name, AUFS_WH_PFX,
AUFS_WH_PFX_LEN));
h_parent = h_dst->d_parent; /* dir inode is locked */
h_dir = d_inode(h_parent);
IMustLock(h_dir);
AuDebugOn(h_parent != h_dst->d_parent);
sb = cpg->dentry->d_sb;
h_path.mnt = au_sbr_mnt(sb, cpg->bdst);
if (do_dt) {
h_path.dentry = h_parent;
au_dtime_store(&dt, dst_parent, &h_path);
}
h_path.dentry = h_dst;
isreg = 0;
isdir = 0;
mode = h_inode->i_mode;
switch (mode & S_IFMT) {
case S_IFREG:
isreg = 1;
err = vfsub_create(h_dir, &h_path, S_IRUSR | S_IWUSR,
/*want_excl*/true);
if (!err)
err = au_do_cpup_regular(cpg, h_src_attr);
break;
case S_IFDIR:
isdir = 1;
err = vfsub_mkdir(h_dir, &h_path, mode);
if (!err)
err = au_do_cpup_dir(cpg, dst_parent, h_dir, &h_path);
break;
case S_IFLNK:
err = au_do_cpup_symlink(&h_path, h_src, h_dir);
break;
case S_IFCHR:
case S_IFBLK:
AuDebugOn(!capable(CAP_MKNOD));
/*FALLTHROUGH*/
case S_IFIFO:
case S_IFSOCK:
err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev);
break;
default:
AuIOErr("Unknown inode type 0%o\n", mode);
err = -EIO;
}
if (!err)
err = au_reset_acl(h_dir, &h_path, mode);
mnt_flags = au_mntflags(sb);
if (!au_opt_test(mnt_flags, UDBA_NONE)
&& !isdir
&& au_opt_test(mnt_flags, XINO)
&& (h_inode->i_nlink == 1
|| (h_inode->i_state & I_LINKABLE))
/* todo: unnecessary? */
/* && d_inode(cpg->dentry)->i_nlink == 1 */
&& cpg->bdst < cpg->bsrc
&& !au_ftest_cpup(cpg->flags, KEEPLINO))
au_xino_write(sb, cpg->bsrc, h_inode->i_ino, /*ino*/0);
/* ignore this error */
if (!err) {
force = 0;
if (isreg) {
force = !!cpg->len;
if (cpg->len == -1)
force = !!i_size_read(h_inode);
}
au_fhsm_wrote(sb, cpg->bdst, force);
}
if (do_dt)
au_dtime_revert(&dt);
return err;
}
static int au_do_ren_after_cpup(struct au_cp_generic *cpg, struct path *h_path)
{
int err;
struct dentry *dentry, *h_dentry, *h_parent, *parent;
struct inode *h_dir;
aufs_bindex_t bdst;
dentry = cpg->dentry;
bdst = cpg->bdst;
h_dentry = au_h_dptr(dentry, bdst);
if (!au_ftest_cpup(cpg->flags, OVERWRITE)) {
dget(h_dentry);
au_set_h_dptr(dentry, bdst, NULL);
err = au_lkup_neg(dentry, bdst, /*wh*/0);
if (!err)
h_path->dentry = dget(au_h_dptr(dentry, bdst));
au_set_h_dptr(dentry, bdst, h_dentry);
} else {
err = 0;
parent = dget_parent(dentry);
h_parent = au_h_dptr(parent, bdst);
dput(parent);
h_path->dentry = vfsub_lkup_one(&dentry->d_name, h_parent);
if (IS_ERR(h_path->dentry))
err = PTR_ERR(h_path->dentry);
}
if (unlikely(err))
goto out;
h_parent = h_dentry->d_parent; /* dir inode is locked */
h_dir = d_inode(h_parent);
IMustLock(h_dir);
AuDbg("%pd %pd\n", h_dentry, h_path->dentry);
/* no delegation since it is just created */
err = vfsub_rename(h_dir, h_dentry, h_dir, h_path, /*delegated*/NULL,
/*flags*/0);
dput(h_path->dentry);
out:
return err;
}
/*
* copyup the @dentry from @bsrc to @bdst.
* the caller must set the both of lower dentries.
* @len is for truncating when it is -1 copyup the entire file.
* in link/rename cases, @dst_parent may be different from the real one.
* basic->bsrc can be larger than basic->bdst.
* aufs doesn't touch the credential so
* security_inode_copy_up{,_xattr}() are unnecrssary.
*/
static int au_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent)
{
int err, rerr;
aufs_bindex_t old_ibtop;
unsigned char isdir, plink;
struct dentry *h_src, *h_dst, *h_parent;
struct inode *dst_inode, *h_dir, *inode, *delegated, *src_inode;
struct super_block *sb;
struct au_branch *br;
/* to reuduce stack size */
struct {
struct au_dtime dt;
struct path h_path;
struct au_cpup_reg_attr h_src_attr;
} *a;
err = -ENOMEM;
a = kmalloc(sizeof(*a), GFP_NOFS);
if (unlikely(!a))
goto out;
a->h_src_attr.valid = 0;
sb = cpg->dentry->d_sb;
br = au_sbr(sb, cpg->bdst);
a->h_path.mnt = au_br_mnt(br);
h_dst = au_h_dptr(cpg->dentry, cpg->bdst);
h_parent = h_dst->d_parent; /* dir inode is locked */
h_dir = d_inode(h_parent);
IMustLock(h_dir);
h_src = au_h_dptr(cpg->dentry, cpg->bsrc);
inode = d_inode(cpg->dentry);
if (!dst_parent)
dst_parent = dget_parent(cpg->dentry);
else
dget(dst_parent);
plink = !!au_opt_test(au_mntflags(sb), PLINK);
dst_inode = au_h_iptr(inode, cpg->bdst);
if (dst_inode) {
if (unlikely(!plink)) {
err = -EIO;
AuIOErr("hi%lu(i%lu) exists on b%d "
"but plink is disabled\n",
dst_inode->i_ino, inode->i_ino, cpg->bdst);
goto out_parent;
}
if (dst_inode->i_nlink) {
const int do_dt = au_ftest_cpup(cpg->flags, DTIME);
h_src = au_plink_lkup(inode, cpg->bdst);
err = PTR_ERR(h_src);
if (IS_ERR(h_src))
goto out_parent;
if (unlikely(d_is_negative(h_src))) {
err = -EIO;
AuIOErr("i%lu exists on b%d "
"but not pseudo-linked\n",
inode->i_ino, cpg->bdst);
dput(h_src);
goto out_parent;
}
if (do_dt) {
a->h_path.dentry = h_parent;
au_dtime_store(&a->dt, dst_parent, &a->h_path);
}
a->h_path.dentry = h_dst;
delegated = NULL;
err = vfsub_link(h_src, h_dir, &a->h_path, &delegated);
if (!err && au_ftest_cpup(cpg->flags, RENAME))
err = au_do_ren_after_cpup(cpg, &a->h_path);
if (do_dt)
au_dtime_revert(&a->dt);
if (unlikely(err == -EWOULDBLOCK)) {
pr_warn("cannot retry for NFSv4 delegation"
" for an internal link\n");
iput(delegated);
}
dput(h_src);
goto out_parent;
} else
/* todo: cpup_wh_file? */
/* udba work */
au_update_ibrange(inode, /*do_put_zero*/1);
}
isdir = S_ISDIR(inode->i_mode);
old_ibtop = au_ibtop(inode);
err = cpup_entry(cpg, dst_parent, &a->h_src_attr);
if (unlikely(err))
goto out_rev;
dst_inode = d_inode(h_dst);
inode_lock_nested(dst_inode, AuLsc_I_CHILD2);
/* todo: necessary? */
/* au_pin_hdir_unlock(cpg->pin); */
err = cpup_iattr(cpg->dentry, cpg->bdst, h_src, &a->h_src_attr);
if (unlikely(err)) {
/* todo: necessary? */
/* au_pin_hdir_relock(cpg->pin); */ /* ignore an error */
inode_unlock(dst_inode);
goto out_rev;
}
if (cpg->bdst < old_ibtop) {
if (S_ISREG(inode->i_mode)) {
err = au_dy_iaop(inode, cpg->bdst, dst_inode);
if (unlikely(err)) {
/* ignore an error */
/* au_pin_hdir_relock(cpg->pin); */
inode_unlock(dst_inode);
goto out_rev;
}
}
au_set_ibtop(inode, cpg->bdst);
} else
au_set_ibbot(inode, cpg->bdst);
au_set_h_iptr(inode, cpg->bdst, au_igrab(dst_inode),
au_hi_flags(inode, isdir));
/* todo: necessary? */
/* err = au_pin_hdir_relock(cpg->pin); */
inode_unlock(dst_inode);
if (unlikely(err))
goto out_rev;
src_inode = d_inode(h_src);
if (!isdir
&& (src_inode->i_nlink > 1
|| src_inode->i_state & I_LINKABLE)
&& plink)
au_plink_append(inode, cpg->bdst, h_dst);
if (au_ftest_cpup(cpg->flags, RENAME)) {
a->h_path.dentry = h_dst;
err = au_do_ren_after_cpup(cpg, &a->h_path);
}
if (!err)
goto out_parent; /* success */
/* revert */
out_rev:
a->h_path.dentry = h_parent;
au_dtime_store(&a->dt, dst_parent, &a->h_path);
a->h_path.dentry = h_dst;
rerr = 0;
if (d_is_positive(h_dst)) {
if (!isdir) {
/* no delegation since it is just created */
rerr = vfsub_unlink(h_dir, &a->h_path,
/*delegated*/NULL, /*force*/0);
} else
rerr = vfsub_rmdir(h_dir, &a->h_path);
}
au_dtime_revert(&a->dt);
if (rerr) {
AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr);
err = -EIO;
}
out_parent:
dput(dst_parent);
au_delayed_kfree(a);
out:
return err;
}
#if 0 /* reserved */
struct au_cpup_single_args {
int *errp;
struct au_cp_generic *cpg;
struct dentry *dst_parent;
};
static void au_call_cpup_single(void *args)
{
struct au_cpup_single_args *a = args;
au_pin_hdir_acquire_nest(a->cpg->pin);
*a->errp = au_cpup_single(a->cpg, a->dst_parent);
au_pin_hdir_release(a->cpg->pin);
}
#endif
/*
* prevent SIGXFSZ in copy-up.
* testing CAP_MKNOD is for generic fs,
* but CAP_FSETID is for xfs only, currently.
*/
static int au_cpup_sio_test(struct au_pin *pin, umode_t mode)
{
int do_sio;
struct super_block *sb;
struct inode *h_dir;
do_sio = 0;
sb = au_pinned_parent(pin)->d_sb;
if (!au_wkq_test()
&& (!au_sbi(sb)->si_plink_maint_pid
|| au_plink_maint(sb, AuLock_NOPLM))) {
switch (mode & S_IFMT) {
case S_IFREG:
/* no condition about RLIMIT_FSIZE and the file size */
do_sio = 1;
break;
case S_IFCHR:
case S_IFBLK:
do_sio = !capable(CAP_MKNOD);
break;
}
if (!do_sio)
do_sio = ((mode & (S_ISUID | S_ISGID))
&& !capable(CAP_FSETID));
/* this workaround may be removed in the future */
if (!do_sio) {
h_dir = au_pinned_h_dir(pin);
do_sio = h_dir->i_mode & S_ISVTX;
}
}
return do_sio;
}
#if 0 /* reserved */
int au_sio_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent)
{
int err, wkq_err;
struct dentry *h_dentry;
h_dentry = au_h_dptr(cpg->dentry, cpg->bsrc);
if (!au_cpup_sio_test(pin, d_inode(h_dentry)->i_mode))
err = au_cpup_single(cpg, dst_parent);
else {
struct au_cpup_single_args args = {
.errp = &err,
.cpg = cpg,
.dst_parent = dst_parent
};
wkq_err = au_wkq_wait(au_call_cpup_single, &args);
if (unlikely(wkq_err))
err = wkq_err;
}
return err;
}
#endif
/*
* copyup the @dentry from the first active lower branch to @bdst,
* using au_cpup_single().
*/
static int au_cpup_simple(struct au_cp_generic *cpg)
{
int err;
unsigned int flags_orig;
struct dentry *dentry;
AuDebugOn(cpg->bsrc < 0);
dentry = cpg->dentry;
DiMustWriteLock(dentry);
err = au_lkup_neg(dentry, cpg->bdst, /*wh*/1);
if (!err) {
flags_orig = cpg->flags;
au_fset_cpup(cpg->flags, RENAME);
err = au_cpup_single(cpg, NULL);
cpg->flags = flags_orig;
if (!err)
return 0; /* success */
/* revert */
au_set_h_dptr(dentry, cpg->bdst, NULL);
au_set_dbtop(dentry, cpg->bsrc);
}
return err;
}
struct au_cpup_simple_args {
int *errp;
struct au_cp_generic *cpg;
};
static void au_call_cpup_simple(void *args)
{
struct au_cpup_simple_args *a = args;
au_pin_hdir_acquire_nest(a->cpg->pin);
*a->errp = au_cpup_simple(a->cpg);
au_pin_hdir_release(a->cpg->pin);
}
static int au_do_sio_cpup_simple(struct au_cp_generic *cpg)
{
int err, wkq_err;
struct dentry *dentry, *parent;
struct file *h_file;
struct inode *h_dir;
dentry = cpg->dentry;
h_file = NULL;
if (au_ftest_cpup(cpg->flags, HOPEN)) {
AuDebugOn(cpg->bsrc < 0);
h_file = au_h_open_pre(dentry, cpg->bsrc, /*force_wr*/0);
err = PTR_ERR(h_file);
if (IS_ERR(h_file))
goto out;
}
parent = dget_parent(dentry);
h_dir = au_h_iptr(d_inode(parent), cpg->bdst);
if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE)
&& !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode))
err = au_cpup_simple(cpg);
else {
struct au_cpup_simple_args args = {
.errp = &err,
.cpg = cpg
};
wkq_err = au_wkq_wait(au_call_cpup_simple, &args);
if (unlikely(wkq_err))
err = wkq_err;
}
dput(parent);
if (h_file)
au_h_open_post(dentry, cpg->bsrc, h_file);
out:
return err;
}
int au_sio_cpup_simple(struct au_cp_generic *cpg)
{
aufs_bindex_t bsrc, bbot;
struct dentry *dentry, *h_dentry;
if (cpg->bsrc < 0) {
dentry = cpg->dentry;
bbot = au_dbbot(dentry);
for (bsrc = cpg->bdst + 1; bsrc <= bbot; bsrc++) {
h_dentry = au_h_dptr(dentry, bsrc);
if (h_dentry) {
AuDebugOn(d_is_negative(h_dentry));
break;
}
}
AuDebugOn(bsrc > bbot);
cpg->bsrc = bsrc;
}
AuDebugOn(cpg->bsrc <= cpg->bdst);
return au_do_sio_cpup_simple(cpg);
}
int au_sio_cpdown_simple(struct au_cp_generic *cpg)
{
AuDebugOn(cpg->bdst <= cpg->bsrc);
return au_do_sio_cpup_simple(cpg);
}
/* ---------------------------------------------------------------------- */
/*
* copyup the deleted file for writing.
*/
static int au_do_cpup_wh(struct au_cp_generic *cpg, struct dentry *wh_dentry,
struct file *file)
{
int err;
unsigned int flags_orig;
aufs_bindex_t bsrc_orig;
struct au_dinfo *dinfo;
struct {
struct au_hdentry *hd;
struct dentry *h_dentry;
} hdst, hsrc;
dinfo = au_di(cpg->dentry);
AuRwMustWriteLock(&dinfo->di_rwsem);
bsrc_orig = cpg->bsrc;
cpg->bsrc = dinfo->di_btop;
hdst.hd = au_hdentry(dinfo, cpg->bdst);
hdst.h_dentry = hdst.hd->hd_dentry;
hdst.hd->hd_dentry = wh_dentry;
dinfo->di_btop = cpg->bdst;
hsrc.h_dentry = NULL;
if (file) {
hsrc.hd = au_hdentry(dinfo, cpg->bsrc);
hsrc.h_dentry = hsrc.hd->hd_dentry;
hsrc.hd->hd_dentry = au_hf_top(file)->f_path.dentry;
}
flags_orig = cpg->flags;
cpg->flags = !AuCpup_DTIME;
err = au_cpup_single(cpg, /*h_parent*/NULL);
cpg->flags = flags_orig;
if (file) {
if (!err)
err = au_reopen_nondir(file);
hsrc.hd->hd_dentry = hsrc.h_dentry;
}
hdst.hd->hd_dentry = hdst.h_dentry;
dinfo->di_btop = cpg->bsrc;
cpg->bsrc = bsrc_orig;
return err;
}
static int au_cpup_wh(struct au_cp_generic *cpg, struct file *file)
{
int err;
aufs_bindex_t bdst;
struct au_dtime dt;
struct dentry *dentry, *parent, *h_parent, *wh_dentry;
struct au_branch *br;
struct path h_path;
dentry = cpg->dentry;
bdst = cpg->bdst;
br = au_sbr(dentry->d_sb, bdst);
parent = dget_parent(dentry);
h_parent = au_h_dptr(parent, bdst);
wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
err = PTR_ERR(wh_dentry);
if (IS_ERR(wh_dentry))
goto out;
h_path.dentry = h_parent;
h_path.mnt = au_br_mnt(br);
au_dtime_store(&dt, parent, &h_path);
err = au_do_cpup_wh(cpg, wh_dentry, file);
if (unlikely(err))
goto out_wh;
dget(wh_dentry);
h_path.dentry = wh_dentry;
if (!d_is_dir(wh_dentry)) {
/* no delegation since it is just created */
err = vfsub_unlink(d_inode(h_parent), &h_path,
/*delegated*/NULL, /*force*/0);
} else
err = vfsub_rmdir(d_inode(h_parent), &h_path);
if (unlikely(err)) {
AuIOErr("failed remove copied-up tmp file %pd(%d)\n",
wh_dentry, err);
err = -EIO;
}
au_dtime_revert(&dt);
au_set_hi_wh(d_inode(dentry), bdst, wh_dentry);
out_wh:
dput(wh_dentry);
out:
dput(parent);
return err;
}
struct au_cpup_wh_args {
int *errp;
struct au_cp_generic *cpg;
struct file *file;
};
static void au_call_cpup_wh(void *args)
{
struct au_cpup_wh_args *a = args;
au_pin_hdir_acquire_nest(a->cpg->pin);
*a->errp = au_cpup_wh(a->cpg, a->file);
au_pin_hdir_release(a->cpg->pin);
}
int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file)
{
int err, wkq_err;
aufs_bindex_t bdst;
struct dentry *dentry, *parent, *h_orph, *h_parent;
struct inode *dir, *h_dir, *h_tmpdir;
struct au_wbr *wbr;
struct au_pin wh_pin, *pin_orig;
dentry = cpg->dentry;
bdst = cpg->bdst;
parent = dget_parent(dentry);
dir = d_inode(parent);
h_orph = NULL;
h_parent = NULL;
h_dir = au_igrab(au_h_iptr(dir, bdst));
h_tmpdir = h_dir;
pin_orig = NULL;
if (!h_dir->i_nlink) {
wbr = au_sbr(dentry->d_sb, bdst)->br_wbr;
h_orph = wbr->wbr_orph;
h_parent = dget(au_h_dptr(parent, bdst));
au_set_h_dptr(parent, bdst, dget(h_orph));
h_tmpdir = d_inode(h_orph);
au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0);
inode_lock_nested(h_tmpdir, AuLsc_I_PARENT3);
/* todo: au_h_open_pre()? */
pin_orig = cpg->pin;
au_pin_init(&wh_pin, dentry, bdst, AuLsc_DI_PARENT,
AuLsc_I_PARENT3, cpg->pin->udba, AuPin_DI_LOCKED);
cpg->pin = &wh_pin;
}
if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE)
&& !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode))
err = au_cpup_wh(cpg, file);
else {
struct au_cpup_wh_args args = {
.errp = &err,
.cpg = cpg,
.file = file
};
wkq_err = au_wkq_wait(au_call_cpup_wh, &args);
if (unlikely(wkq_err))
err = wkq_err;
}
if (h_orph) {
inode_unlock(h_tmpdir);
/* todo: au_h_open_post()? */
au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0);
au_set_h_dptr(parent, bdst, h_parent);
AuDebugOn(!pin_orig);
cpg->pin = pin_orig;
}
iput(h_dir);
dput(parent);
return err;
}
/* ---------------------------------------------------------------------- */
/*
* generic routine for both of copy-up and copy-down.
*/
/* cf. revalidate function in file.c */
int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
struct au_pin *pin,
struct dentry *h_parent, void *arg),
void *arg)
{
int err;
struct au_pin pin;
struct dentry *d, *parent, *h_parent, *real_parent, *h_dentry;
err = 0;
parent = dget_parent(dentry);
if (IS_ROOT(parent))
goto out;
au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2,
au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE);
/* do not use au_dpage */
real_parent = parent;
while (1) {
dput(parent);
parent = dget_parent(dentry);
h_parent = au_h_dptr(parent, bdst);
if (h_parent)
goto out; /* success */
/* find top dir which is necessary to cpup */
do {
d = parent;
dput(parent);
parent = dget_parent(d);
di_read_lock_parent3(parent, !AuLock_IR);
h_parent = au_h_dptr(parent, bdst);
di_read_unlock(parent, !AuLock_IR);
} while (!h_parent);
if (d != real_parent)
di_write_lock_child3(d);
/* somebody else might create while we were sleeping */
h_dentry = au_h_dptr(d, bdst);
if (!h_dentry || d_is_negative(h_dentry)) {
if (h_dentry)
au_update_dbtop(d);
au_pin_set_dentry(&pin, d);
err = au_do_pin(&pin);
if (!err) {
err = cp(d, bdst, &pin, h_parent, arg);
au_unpin(&pin);
}
}
if (d != real_parent)
di_write_unlock(d);
if (unlikely(err))
break;
}
out:
dput(parent);
return err;
}
static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst,
struct au_pin *pin,
struct dentry *h_parent __maybe_unused,
void *arg __maybe_unused)
{
struct au_cp_generic cpg = {
.dentry = dentry,
.bdst = bdst,
.bsrc = -1,
.len = 0,
.pin = pin,
.flags = AuCpup_DTIME
};
return au_sio_cpup_simple(&cpg);
}
int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
{
return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL);
}
int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
{
int err;
struct dentry *parent;
struct inode *dir;
parent = dget_parent(dentry);
dir = d_inode(parent);
err = 0;
if (au_h_iptr(dir, bdst))
goto out;
di_read_unlock(parent, AuLock_IR);
di_write_lock_parent(parent);
/* someone else might change our inode while we were sleeping */
if (!au_h_iptr(dir, bdst))
err = au_cpup_dirs(dentry, bdst);
di_downgrade_lock(parent, AuLock_IR);
out:
dput(parent);
return err;
}
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