/usr/src/aufs-4.9+20161219/fs/aufs/wbr_policy.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/>.
*/
/*
* policies for selecting one among multiple writable branches
*/
#include <linux/statfs.h>
#include "aufs.h"
/* subset of cpup_attr() */
static noinline_for_stack
int au_cpdown_attr(struct path *h_path, struct dentry *h_src)
{
int err, sbits;
struct iattr ia;
struct inode *h_isrc;
h_isrc = d_inode(h_src);
ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID;
ia.ia_mode = h_isrc->i_mode;
ia.ia_uid = h_isrc->i_uid;
ia.ia_gid = h_isrc->i_gid;
sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
au_cpup_attr_flags(d_inode(h_path->dentry), h_isrc->i_flags);
/* no delegation since it is just created */
err = vfsub_sio_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_sio_notify_change(h_path, &ia, /*delegated*/NULL);
}
return err;
}
#define AuCpdown_PARENT_OPQ 1
#define AuCpdown_WHED (1 << 1)
#define AuCpdown_MADE_DIR (1 << 2)
#define AuCpdown_DIROPQ (1 << 3)
#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name)
#define au_fset_cpdown(flags, name) \
do { (flags) |= AuCpdown_##name; } while (0)
#define au_fclr_cpdown(flags, name) \
do { (flags) &= ~AuCpdown_##name; } while (0)
static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst,
unsigned int *flags)
{
int err;
struct dentry *opq_dentry;
opq_dentry = au_diropq_create(dentry, bdst);
err = PTR_ERR(opq_dentry);
if (IS_ERR(opq_dentry))
goto out;
dput(opq_dentry);
au_fset_cpdown(*flags, DIROPQ);
out:
return err;
}
static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent,
struct inode *dir, aufs_bindex_t bdst)
{
int err;
struct path h_path;
struct au_branch *br;
br = au_sbr(dentry->d_sb, bdst);
h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
err = PTR_ERR(h_path.dentry);
if (IS_ERR(h_path.dentry))
goto out;
err = 0;
if (d_is_positive(h_path.dentry)) {
h_path.mnt = au_br_mnt(br);
err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path,
dentry);
}
dput(h_path.dentry);
out:
return err;
}
static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
struct au_pin *pin,
struct dentry *h_parent, void *arg)
{
int err, rerr;
aufs_bindex_t bopq, btop;
struct path h_path;
struct dentry *parent;
struct inode *h_dir, *h_inode, *inode, *dir;
unsigned int *flags = arg;
btop = au_dbtop(dentry);
/* dentry is di-locked */
parent = dget_parent(dentry);
dir = d_inode(parent);
h_dir = d_inode(h_parent);
AuDebugOn(h_dir != au_h_iptr(dir, bdst));
IMustLock(h_dir);
err = au_lkup_neg(dentry, bdst, /*wh*/0);
if (unlikely(err < 0))
goto out;
h_path.dentry = au_h_dptr(dentry, bdst);
h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst);
err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path,
S_IRWXU | S_IRUGO | S_IXUGO);
if (unlikely(err))
goto out_put;
au_fset_cpdown(*flags, MADE_DIR);
bopq = au_dbdiropq(dentry);
au_fclr_cpdown(*flags, WHED);
au_fclr_cpdown(*flags, DIROPQ);
if (au_dbwh(dentry) == bdst)
au_fset_cpdown(*flags, WHED);
if (!au_ftest_cpdown(*flags, PARENT_OPQ) && bopq <= bdst)
au_fset_cpdown(*flags, PARENT_OPQ);
h_inode = d_inode(h_path.dentry);
inode_lock_nested(h_inode, AuLsc_I_CHILD);
if (au_ftest_cpdown(*flags, WHED)) {
err = au_cpdown_dir_opq(dentry, bdst, flags);
if (unlikely(err)) {
inode_unlock(h_inode);
goto out_dir;
}
}
err = au_cpdown_attr(&h_path, au_h_dptr(dentry, btop));
inode_unlock(h_inode);
if (unlikely(err))
goto out_opq;
if (au_ftest_cpdown(*flags, WHED)) {
err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst);
if (unlikely(err))
goto out_opq;
}
inode = d_inode(dentry);
if (au_ibbot(inode) < bdst)
au_set_ibbot(inode, bdst);
au_set_h_iptr(inode, bdst, au_igrab(h_inode),
au_hi_flags(inode, /*isdir*/1));
au_fhsm_wrote(dentry->d_sb, bdst, /*force*/0);
goto out; /* success */
/* revert */
out_opq:
if (au_ftest_cpdown(*flags, DIROPQ)) {
inode_lock_nested(h_inode, AuLsc_I_CHILD);
rerr = au_diropq_remove(dentry, bdst);
inode_unlock(h_inode);
if (unlikely(rerr)) {
AuIOErr("failed removing diropq for %pd b%d (%d)\n",
dentry, bdst, rerr);
err = -EIO;
goto out;
}
}
out_dir:
if (au_ftest_cpdown(*flags, MADE_DIR)) {
rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path);
if (unlikely(rerr)) {
AuIOErr("failed removing %pd b%d (%d)\n",
dentry, bdst, rerr);
err = -EIO;
}
}
out_put:
au_set_h_dptr(dentry, bdst, NULL);
if (au_dbbot(dentry) == bdst)
au_update_dbbot(dentry);
out:
dput(parent);
return err;
}
int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst)
{
int err;
unsigned int flags;
flags = 0;
err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &flags);
return err;
}
/* ---------------------------------------------------------------------- */
/* policies for create */
int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex)
{
int err, i, j, ndentry;
aufs_bindex_t bopq;
struct au_dcsub_pages dpages;
struct au_dpage *dpage;
struct dentry **dentries, *parent, *d;
err = au_dpages_init(&dpages, GFP_NOFS);
if (unlikely(err))
goto out;
parent = dget_parent(dentry);
err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0);
if (unlikely(err))
goto out_free;
err = bindex;
for (i = 0; i < dpages.ndpage; i++) {
dpage = dpages.dpages + i;
dentries = dpage->dentries;
ndentry = dpage->ndentry;
for (j = 0; j < ndentry; j++) {
d = dentries[j];
di_read_lock_parent2(d, !AuLock_IR);
bopq = au_dbdiropq(d);
di_read_unlock(d, !AuLock_IR);
if (bopq >= 0 && bopq < err)
err = bopq;
}
}
out_free:
dput(parent);
au_dpages_free(&dpages);
out:
return err;
}
static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex)
{
for (; bindex >= 0; bindex--)
if (!au_br_rdonly(au_sbr(sb, bindex)))
return bindex;
return -EROFS;
}
/* top down parent */
static int au_wbr_create_tdp(struct dentry *dentry,
unsigned int flags __maybe_unused)
{
int err;
aufs_bindex_t btop, bindex;
struct super_block *sb;
struct dentry *parent, *h_parent;
sb = dentry->d_sb;
btop = au_dbtop(dentry);
err = btop;
if (!au_br_rdonly(au_sbr(sb, btop)))
goto out;
err = -EROFS;
parent = dget_parent(dentry);
for (bindex = au_dbtop(parent); bindex < btop; bindex++) {
h_parent = au_h_dptr(parent, bindex);
if (!h_parent || d_is_negative(h_parent))
continue;
if (!au_br_rdonly(au_sbr(sb, bindex))) {
err = bindex;
break;
}
}
dput(parent);
/* bottom up here */
if (unlikely(err < 0)) {
err = au_wbr_bu(sb, btop - 1);
if (err >= 0)
err = au_wbr_nonopq(dentry, err);
}
out:
AuDbg("b%d\n", err);
return err;
}
/* ---------------------------------------------------------------------- */
/* an exception for the policy other than tdp */
static int au_wbr_create_exp(struct dentry *dentry)
{
int err;
aufs_bindex_t bwh, bdiropq;
struct dentry *parent;
err = -1;
bwh = au_dbwh(dentry);
parent = dget_parent(dentry);
bdiropq = au_dbdiropq(parent);
if (bwh >= 0) {
if (bdiropq >= 0)
err = min(bdiropq, bwh);
else
err = bwh;
AuDbg("%d\n", err);
} else if (bdiropq >= 0) {
err = bdiropq;
AuDbg("%d\n", err);
}
dput(parent);
if (err >= 0)
err = au_wbr_nonopq(dentry, err);
if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err)))
err = -1;
AuDbg("%d\n", err);
return err;
}
/* ---------------------------------------------------------------------- */
/* round robin */
static int au_wbr_create_init_rr(struct super_block *sb)
{
int err;
err = au_wbr_bu(sb, au_sbbot(sb));
atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */
/* smp_mb(); */
AuDbg("b%d\n", err);
return err;
}
static int au_wbr_create_rr(struct dentry *dentry, unsigned int flags)
{
int err, nbr;
unsigned int u;
aufs_bindex_t bindex, bbot;
struct super_block *sb;
atomic_t *next;
err = au_wbr_create_exp(dentry);
if (err >= 0)
goto out;
sb = dentry->d_sb;
next = &au_sbi(sb)->si_wbr_rr_next;
bbot = au_sbbot(sb);
nbr = bbot + 1;
for (bindex = 0; bindex <= bbot; bindex++) {
if (!au_ftest_wbr(flags, DIR)) {
err = atomic_dec_return(next) + 1;
/* modulo for 0 is meaningless */
if (unlikely(!err))
err = atomic_dec_return(next) + 1;
} else
err = atomic_read(next);
AuDbg("%d\n", err);
u = err;
err = u % nbr;
AuDbg("%d\n", err);
if (!au_br_rdonly(au_sbr(sb, err)))
break;
err = -EROFS;
}
if (err >= 0)
err = au_wbr_nonopq(dentry, err);
out:
AuDbg("%d\n", err);
return err;
}
/* ---------------------------------------------------------------------- */
/* most free space */
static void au_mfs(struct dentry *dentry, struct dentry *parent)
{
struct super_block *sb;
struct au_branch *br;
struct au_wbr_mfs *mfs;
struct dentry *h_parent;
aufs_bindex_t bindex, bbot;
int err;
unsigned long long b, bavail;
struct path h_path;
/* reduce the stack usage */
struct kstatfs *st;
st = kmalloc(sizeof(*st), GFP_NOFS);
if (unlikely(!st)) {
AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM);
return;
}
bavail = 0;
sb = dentry->d_sb;
mfs = &au_sbi(sb)->si_wbr_mfs;
MtxMustLock(&mfs->mfs_lock);
mfs->mfs_bindex = -EROFS;
mfs->mfsrr_bytes = 0;
if (!parent) {
bindex = 0;
bbot = au_sbbot(sb);
} else {
bindex = au_dbtop(parent);
bbot = au_dbtaildir(parent);
}
for (; bindex <= bbot; bindex++) {
if (parent) {
h_parent = au_h_dptr(parent, bindex);
if (!h_parent || d_is_negative(h_parent))
continue;
}
br = au_sbr(sb, bindex);
if (au_br_rdonly(br))
continue;
/* sb->s_root for NFS is unreliable */
h_path.mnt = au_br_mnt(br);
h_path.dentry = h_path.mnt->mnt_root;
err = vfs_statfs(&h_path, st);
if (unlikely(err)) {
AuWarn1("failed statfs, b%d, %d\n", bindex, err);
continue;
}
/* when the available size is equal, select the lower one */
BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail)
|| sizeof(b) < sizeof(st->f_bsize));
b = st->f_bavail * st->f_bsize;
br->br_wbr->wbr_bytes = b;
if (b >= bavail) {
bavail = b;
mfs->mfs_bindex = bindex;
mfs->mfs_jiffy = jiffies;
}
}
mfs->mfsrr_bytes = bavail;
AuDbg("b%d\n", mfs->mfs_bindex);
au_delayed_kfree(st);
}
static int au_wbr_create_mfs(struct dentry *dentry, unsigned int flags)
{
int err;
struct dentry *parent;
struct super_block *sb;
struct au_wbr_mfs *mfs;
err = au_wbr_create_exp(dentry);
if (err >= 0)
goto out;
sb = dentry->d_sb;
parent = NULL;
if (au_ftest_wbr(flags, PARENT))
parent = dget_parent(dentry);
mfs = &au_sbi(sb)->si_wbr_mfs;
mutex_lock(&mfs->mfs_lock);
if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
|| mfs->mfs_bindex < 0
|| au_br_rdonly(au_sbr(sb, mfs->mfs_bindex)))
au_mfs(dentry, parent);
mutex_unlock(&mfs->mfs_lock);
err = mfs->mfs_bindex;
dput(parent);
if (err >= 0)
err = au_wbr_nonopq(dentry, err);
out:
AuDbg("b%d\n", err);
return err;
}
static int au_wbr_create_init_mfs(struct super_block *sb)
{
struct au_wbr_mfs *mfs;
mfs = &au_sbi(sb)->si_wbr_mfs;
mutex_init(&mfs->mfs_lock);
mfs->mfs_jiffy = 0;
mfs->mfs_bindex = -EROFS;
return 0;
}
static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused)
{
mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock);
return 0;
}
/* ---------------------------------------------------------------------- */
/* top down regardless parent, and then mfs */
static int au_wbr_create_tdmfs(struct dentry *dentry,
unsigned int flags __maybe_unused)
{
int err;
aufs_bindex_t bwh, btail, bindex, bfound, bmfs;
unsigned long long watermark;
struct super_block *sb;
struct au_wbr_mfs *mfs;
struct au_branch *br;
struct dentry *parent;
sb = dentry->d_sb;
mfs = &au_sbi(sb)->si_wbr_mfs;
mutex_lock(&mfs->mfs_lock);
if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
|| mfs->mfs_bindex < 0)
au_mfs(dentry, /*parent*/NULL);
watermark = mfs->mfsrr_watermark;
bmfs = mfs->mfs_bindex;
mutex_unlock(&mfs->mfs_lock);
/* another style of au_wbr_create_exp() */
bwh = au_dbwh(dentry);
parent = dget_parent(dentry);
btail = au_dbtaildir(parent);
if (bwh >= 0 && bwh < btail)
btail = bwh;
err = au_wbr_nonopq(dentry, btail);
if (unlikely(err < 0))
goto out;
btail = err;
bfound = -1;
for (bindex = 0; bindex <= btail; bindex++) {
br = au_sbr(sb, bindex);
if (au_br_rdonly(br))
continue;
if (br->br_wbr->wbr_bytes > watermark) {
bfound = bindex;
break;
}
}
err = bfound;
if (err < 0)
err = bmfs;
out:
dput(parent);
AuDbg("b%d\n", err);
return err;
}
/* ---------------------------------------------------------------------- */
/* most free space and then round robin */
static int au_wbr_create_mfsrr(struct dentry *dentry, unsigned int flags)
{
int err;
struct au_wbr_mfs *mfs;
err = au_wbr_create_mfs(dentry, flags);
if (err >= 0) {
mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs;
mutex_lock(&mfs->mfs_lock);
if (mfs->mfsrr_bytes < mfs->mfsrr_watermark)
err = au_wbr_create_rr(dentry, flags);
mutex_unlock(&mfs->mfs_lock);
}
AuDbg("b%d\n", err);
return err;
}
static int au_wbr_create_init_mfsrr(struct super_block *sb)
{
int err;
au_wbr_create_init_mfs(sb); /* ignore */
err = au_wbr_create_init_rr(sb);
return err;
}
/* ---------------------------------------------------------------------- */
/* top down parent and most free space */
static int au_wbr_create_pmfs(struct dentry *dentry, unsigned int flags)
{
int err, e2;
unsigned long long b;
aufs_bindex_t bindex, btop, bbot;
struct super_block *sb;
struct dentry *parent, *h_parent;
struct au_branch *br;
err = au_wbr_create_tdp(dentry, flags);
if (unlikely(err < 0))
goto out;
parent = dget_parent(dentry);
btop = au_dbtop(parent);
bbot = au_dbtaildir(parent);
if (btop == bbot)
goto out_parent; /* success */
e2 = au_wbr_create_mfs(dentry, flags);
if (e2 < 0)
goto out_parent; /* success */
/* when the available size is equal, select upper one */
sb = dentry->d_sb;
br = au_sbr(sb, err);
b = br->br_wbr->wbr_bytes;
AuDbg("b%d, %llu\n", err, b);
for (bindex = btop; bindex <= bbot; bindex++) {
h_parent = au_h_dptr(parent, bindex);
if (!h_parent || d_is_negative(h_parent))
continue;
br = au_sbr(sb, bindex);
if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) {
b = br->br_wbr->wbr_bytes;
err = bindex;
AuDbg("b%d, %llu\n", err, b);
}
}
if (err >= 0)
err = au_wbr_nonopq(dentry, err);
out_parent:
dput(parent);
out:
AuDbg("b%d\n", err);
return err;
}
/* ---------------------------------------------------------------------- */
/*
* - top down parent
* - most free space with parent
* - most free space round-robin regardless parent
*/
static int au_wbr_create_pmfsrr(struct dentry *dentry, unsigned int flags)
{
int err;
unsigned long long watermark;
struct super_block *sb;
struct au_branch *br;
struct au_wbr_mfs *mfs;
err = au_wbr_create_pmfs(dentry, flags | AuWbr_PARENT);
if (unlikely(err < 0))
goto out;
sb = dentry->d_sb;
br = au_sbr(sb, err);
mfs = &au_sbi(sb)->si_wbr_mfs;
mutex_lock(&mfs->mfs_lock);
watermark = mfs->mfsrr_watermark;
mutex_unlock(&mfs->mfs_lock);
if (br->br_wbr->wbr_bytes < watermark)
/* regardless the parent dir */
err = au_wbr_create_mfsrr(dentry, flags);
out:
AuDbg("b%d\n", err);
return err;
}
/* ---------------------------------------------------------------------- */
/* policies for copyup */
/* top down parent */
static int au_wbr_copyup_tdp(struct dentry *dentry)
{
return au_wbr_create_tdp(dentry, /*flags, anything is ok*/0);
}
/* bottom up parent */
static int au_wbr_copyup_bup(struct dentry *dentry)
{
int err;
aufs_bindex_t bindex, btop;
struct dentry *parent, *h_parent;
struct super_block *sb;
err = -EROFS;
sb = dentry->d_sb;
parent = dget_parent(dentry);
btop = au_dbtop(parent);
for (bindex = au_dbtop(dentry); bindex >= btop; bindex--) {
h_parent = au_h_dptr(parent, bindex);
if (!h_parent || d_is_negative(h_parent))
continue;
if (!au_br_rdonly(au_sbr(sb, bindex))) {
err = bindex;
break;
}
}
dput(parent);
/* bottom up here */
if (unlikely(err < 0))
err = au_wbr_bu(sb, btop - 1);
AuDbg("b%d\n", err);
return err;
}
/* bottom up */
int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop)
{
int err;
err = au_wbr_bu(dentry->d_sb, btop);
AuDbg("b%d\n", err);
if (err > btop)
err = au_wbr_nonopq(dentry, err);
AuDbg("b%d\n", err);
return err;
}
static int au_wbr_copyup_bu(struct dentry *dentry)
{
int err;
aufs_bindex_t btop;
btop = au_dbtop(dentry);
err = au_wbr_do_copyup_bu(dentry, btop);
return err;
}
/* ---------------------------------------------------------------------- */
struct au_wbr_copyup_operations au_wbr_copyup_ops[] = {
[AuWbrCopyup_TDP] = {
.copyup = au_wbr_copyup_tdp
},
[AuWbrCopyup_BUP] = {
.copyup = au_wbr_copyup_bup
},
[AuWbrCopyup_BU] = {
.copyup = au_wbr_copyup_bu
}
};
struct au_wbr_create_operations au_wbr_create_ops[] = {
[AuWbrCreate_TDP] = {
.create = au_wbr_create_tdp
},
[AuWbrCreate_RR] = {
.create = au_wbr_create_rr,
.init = au_wbr_create_init_rr
},
[AuWbrCreate_MFS] = {
.create = au_wbr_create_mfs,
.init = au_wbr_create_init_mfs,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_MFSV] = {
.create = au_wbr_create_mfs,
.init = au_wbr_create_init_mfs,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_MFSRR] = {
.create = au_wbr_create_mfsrr,
.init = au_wbr_create_init_mfsrr,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_MFSRRV] = {
.create = au_wbr_create_mfsrr,
.init = au_wbr_create_init_mfsrr,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_TDMFS] = {
.create = au_wbr_create_tdmfs,
.init = au_wbr_create_init_mfs,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_TDMFSV] = {
.create = au_wbr_create_tdmfs,
.init = au_wbr_create_init_mfs,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_PMFS] = {
.create = au_wbr_create_pmfs,
.init = au_wbr_create_init_mfs,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_PMFSV] = {
.create = au_wbr_create_pmfs,
.init = au_wbr_create_init_mfs,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_PMFSRR] = {
.create = au_wbr_create_pmfsrr,
.init = au_wbr_create_init_mfsrr,
.fin = au_wbr_create_fin_mfs
},
[AuWbrCreate_PMFSRRV] = {
.create = au_wbr_create_pmfsrr,
.init = au_wbr_create_init_mfsrr,
.fin = au_wbr_create_fin_mfs
}
};
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