static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex,
struct au_branch *br)
{
aufs_bindex_t bend;
struct au_sbinfo *sbinfo;
struct dentry *root, *h_root;
struct inode *inode, *h_inode;
struct au_hinode *hinode;
SiMustWriteLock(sb);
root = sb->s_root;
inode = root->d_inode;
sbinfo = au_sbi(sb);
bend = sbinfo->si_bend;
h_root = au_h_dptr(root, bindex);
hinode = au_hi(inode, bindex);
h_inode = au_igrab(hinode->hi_inode);
au_hiput(hinode);
au_sbilist_lock();
au_br_do_del_brp(sbinfo, bindex, bend);
au_br_do_del_hdp(au_di(root), bindex, bend);
au_br_do_del_hip(au_ii(inode), bindex, bend);
au_sbilist_unlock();
dput(h_root);
iput(h_inode);
au_br_do_free(br);
}
int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
{
int err, e, update;
unsigned int flags;
umode_t mode;
aufs_bindex_t bindex, bend;
unsigned char isdir;
struct au_hinode *p;
struct au_iinfo *iinfo;
err = au_ii_refresh(inode, &update);
if (unlikely(err))
goto out;
update = 0;
iinfo = au_ii(inode);
p = iinfo->ii_hinode + iinfo->ii_bstart;
mode = (inode->i_mode & S_IFMT);
isdir = S_ISDIR(mode);
flags = au_hi_flags(inode, isdir);
bend = au_dbend(dentry);
for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
struct inode *h_i;
struct dentry *h_d;
h_d = au_h_dptr(dentry, bindex);
if (!h_d || !h_d->d_inode)
continue;
AuDebugOn(mode != (h_d->d_inode->i_mode & S_IFMT));
if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
h_i = au_h_iptr(inode, bindex);
if (h_i) {
if (h_i == h_d->d_inode)
continue;
err = -EIO;
break;
}
}
if (bindex < iinfo->ii_bstart)
iinfo->ii_bstart = bindex;
if (iinfo->ii_bend < bindex)
iinfo->ii_bend = bindex;
au_set_h_iptr(inode, bindex, au_igrab(h_d->d_inode), flags);
update = 1;
}
au_update_ibrange(inode, /*do_put_zero*/0);
e = au_dy_irefresh(inode);
if (unlikely(e && !err))
err = e;
if (!err)
au_refresh_hinode_attr(inode, update && isdir);
out:
AuTraceErr(err);
return err;
}
int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
{
int err, update;
unsigned int flags;
aufs_bindex_t bindex, bend;
unsigned char isdir;
struct inode *first;
struct au_hinode *p;
struct au_iinfo *iinfo;
err = au_refresh_hinode_self(inode, /*do_attr*/0);
if (unlikely(err))
goto out;
update = 0;
iinfo = au_ii(inode);
p = iinfo->ii_hinode + iinfo->ii_bstart;
first = p->hi_inode;
isdir = S_ISDIR(inode->i_mode);
flags = au_hi_flags(inode, isdir);
bend = au_dbend(dentry);
for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
struct inode *h_i;
struct dentry *h_d;
h_d = au_h_dptr(dentry, bindex);
if (!h_d || !h_d->d_inode)
continue;
if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
h_i = au_h_iptr(inode, bindex);
if (h_i) {
if (h_i == h_d->d_inode)
continue;
err = -EIO;
break;
}
}
if (bindex < iinfo->ii_bstart)
iinfo->ii_bstart = bindex;
if (iinfo->ii_bend < bindex)
iinfo->ii_bend = bindex;
au_set_h_iptr(inode, bindex, au_igrab(h_d->d_inode), flags);
update = 1;
}
au_update_brange(inode, /*do_put_zero*/0);
if (unlikely(err))
goto out;
au_refresh_hinode_attr(inode, update && isdir);
out:
return err;
}
static void au_br_do_add(struct super_block *sb, struct dentry *h_dentry,
struct au_branch *br, aufs_bindex_t bindex)
{
struct dentry *root;
struct inode *root_inode;
aufs_bindex_t bend, amount;
root = sb->s_root;
root_inode = root->d_inode;
bend = au_sbend(sb);
amount = bend + 1 - bindex;
au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount);
au_br_do_add_hdp(au_di(root), bindex, bend, amount);
au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount);
au_set_h_dptr(root, bindex, dget(h_dentry));
au_set_h_iptr(root_inode, bindex, au_igrab(h_dentry->d_inode),
/*flags*/0);
}
static int set_inode(struct inode *inode, struct dentry *dentry)
{
int err;
unsigned int flags;
umode_t mode;
aufs_bindex_t bindex, bstart, btail;
unsigned char isdir;
struct dentry *h_dentry;
struct inode *h_inode;
struct au_iinfo *iinfo;
IiMustWriteLock(inode);
err = 0;
isdir = 0;
bstart = au_dbstart(dentry);
h_inode = au_h_dptr(dentry, bstart)->d_inode;
mode = h_inode->i_mode;
switch (mode & S_IFMT) {
case S_IFREG:
btail = au_dbtail(dentry);
inode->i_op = &aufs_iop;
inode->i_fop = &aufs_file_fop;
inode->i_mapping->a_ops = &aufs_aop;
break;
case S_IFDIR:
isdir = 1;
btail = au_dbtaildir(dentry);
inode->i_op = &aufs_dir_iop;
inode->i_fop = &aufs_dir_fop;
break;
case S_IFLNK:
btail = au_dbtail(dentry);
inode->i_op = &aufs_symlink_iop;
break;
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
case S_IFSOCK:
btail = au_dbtail(dentry);
inode->i_op = &aufs_iop;
au_init_special_fop(inode, mode, h_inode->i_rdev);
break;
default:
AuIOErr("Unknown file type 0%o\n", mode);
err = -EIO;
goto out;
}
/* do not set inotify for whiteouted dirs (SHWH mode) */
flags = au_hi_flags(inode, isdir);
if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)
&& au_ftest_hi(flags, HINOTIFY)
&& dentry->d_name.len > AUFS_WH_PFX_LEN
&& !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))
au_fclr_hi(flags, HINOTIFY);
iinfo = au_ii(inode);
iinfo->ii_bstart = bstart;
iinfo->ii_bend = btail;
for (bindex = bstart; bindex <= btail; bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (h_dentry)
au_set_h_iptr(inode, bindex,
au_igrab(h_dentry->d_inode), flags);
}
au_cpup_attr_all(inode, /*force*/1);
out:
return err;
}
int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry,
struct inode *_dst_dir, struct dentry *_dst_dentry)
{
int err, flags;
/* reduce stack space */
struct au_ren_args *a;
AuDbg("%.*s, %.*s\n", AuDLNPair(_src_dentry), AuDLNPair(_dst_dentry));
IMustLock(_src_dir);
IMustLock(_dst_dir);
err = -ENOMEM;
BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE);
a = kzalloc(sizeof(*a), GFP_NOFS);
if (unlikely(!a))
goto out;
a->src_dir = _src_dir;
a->src_dentry = _src_dentry;
a->src_inode = a->src_dentry->d_inode;
a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */
a->dst_dir = _dst_dir;
a->dst_dentry = _dst_dentry;
a->dst_inode = a->dst_dentry->d_inode;
a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */
if (a->dst_inode) {
IMustLock(a->dst_inode);
au_igrab(a->dst_inode);
}
err = -ENOTDIR;
flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN;
if (S_ISDIR(a->src_inode->i_mode)) {
au_fset_ren(a->flags, ISDIR);
if (unlikely(a->dst_inode && !S_ISDIR(a->dst_inode->i_mode)))
goto out_free;
err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
AuLock_DIR | flags);
} else
err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
flags);
if (unlikely(err))
goto out_free;
err = au_d_hashed_positive(a->src_dentry);
if (unlikely(err))
goto out_unlock;
err = -ENOENT;
if (a->dst_inode) {
/*
* If it is a dir, VFS unhash dst_dentry before this
* function. It means we cannot rely upon d_unhashed().
*/
if (unlikely(!a->dst_inode->i_nlink))
goto out_unlock;
if (!S_ISDIR(a->dst_inode->i_mode)) {
err = au_d_hashed_positive(a->dst_dentry);
if (unlikely(err))
goto out_unlock;
} else if (unlikely(IS_DEADDIR(a->dst_inode)))
goto out_unlock;
} else if (unlikely(d_unhashed(a->dst_dentry)))
goto out_unlock;
au_fset_ren(a->flags, ISSAMEDIR); /* temporary */
di_write_lock_parent(a->dst_parent);
/* which branch we process */
err = au_ren_wbr(a);
if (unlikely(err < 0))
goto out_parent;
a->br = au_sbr(a->dst_dentry->d_sb, a->btgt);
a->h_path.mnt = a->br->br_mnt;
/* are they available to be renamed */
err = au_ren_may_dir(a);
if (unlikely(err))
goto out_children;
/* prepare the writable parent dir on the same branch */
if (a->dst_bstart == a->btgt) {
au_fset_ren(a->flags, WHDST);
} else {
err = au_cpup_dirs(a->dst_dentry, a->btgt);
if (unlikely(err))
goto out_children;
}
if (a->src_dir != a->dst_dir) {
/*
* this temporary unlock is safe,
* because both dir->i_mutex are locked.
*/
di_write_unlock(a->dst_parent);
di_write_lock_parent(a->src_parent);
err = au_wr_dir_need_wh(a->src_dentry,
au_ftest_ren(a->flags, ISDIR),
&a->btgt);
di_write_unlock(a->src_parent);
di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1);
au_fclr_ren(a->flags, ISSAMEDIR);
} else
err = au_wr_dir_need_wh(a->src_dentry,
au_ftest_ren(a->flags, ISDIR),
&a->btgt);
if (unlikely(err < 0))
goto out_children;
if (err)
au_fset_ren(a->flags, WHSRC);
/* lock them all */
err = au_ren_lock(a);
if (unlikely(err))
goto out_children;
if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE))
err = au_may_ren(a);
else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN))
err = -ENAMETOOLONG;
if (unlikely(err))
goto out_hdir;
/* store timestamps to be revertible */
au_ren_dt(a);
/* here we go */
err = do_rename(a);
if (unlikely(err))
goto out_dt;
/* update dir attributes */
au_ren_refresh_dir(a);
/* dput/iput all lower dentries */
au_ren_refresh(a);
goto out_hdir; /* success */
out_dt:
au_ren_rev_dt(err, a);
out_hdir:
au_ren_unlock(a);
out_children:
au_nhash_wh_free(&a->whlist);
if (err && a->dst_inode && a->dst_bstart != a->btgt) {
AuDbg("bstart %d, btgt %d\n", a->dst_bstart, a->btgt);
au_set_h_dptr(a->dst_dentry, a->btgt, NULL);
au_set_dbstart(a->dst_dentry, a->dst_bstart);
}
out_parent:
if (!err)
d_move(a->src_dentry, a->dst_dentry);
else {
au_update_dbstart(a->dst_dentry);
if (!a->dst_inode)
d_drop(a->dst_dentry);
}
if (au_ftest_ren(a->flags, ISSAMEDIR))
di_write_unlock(a->dst_parent);
else
di_write_unlock2(a->src_parent, a->dst_parent);
out_unlock:
aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry);
out_free:
iput(a->dst_inode);
if (a->thargs)
au_whtmp_rmdir_free(a->thargs);
kfree(a);
out:
AuTraceErr(err);
return err;
}
int au_do_pin(struct au_pin *p)
{
int err;
struct super_block *sb;
struct dentry *h_dentry, *h_parent;
struct au_branch *br;
struct inode *h_dir;
err = 0;
sb = p->dentry->d_sb;
br = au_sbr(sb, p->bindex);
if (IS_ROOT(p->dentry)) {
if (au_ftest_pin(p->flags, MNT_WRITE)) {
p->h_mnt = br->br_mnt;
err = mnt_want_write(p->h_mnt);
if (unlikely(err)) {
au_fclr_pin(p->flags, MNT_WRITE);
goto out_err;
}
}
goto out;
}
h_dentry = NULL;
if (p->bindex <= au_dbend(p->dentry))
h_dentry = au_h_dptr(p->dentry, p->bindex);
p->parent = dget_parent(p->dentry);
if (!au_ftest_pin(p->flags, DI_LOCKED))
di_read_lock(p->parent, AuLock_IR, p->lsc_di);
h_dir = NULL;
h_parent = au_h_dptr(p->parent, p->bindex);
p->hdir = au_hi(p->parent->d_inode, p->bindex);
if (p->hdir)
h_dir = p->hdir->hi_inode;
/*
* udba case, or
* if DI_LOCKED is not set, then p->parent may be different
* and h_parent can be NULL.
*/
if (unlikely(!p->hdir || !h_dir || !h_parent)) {
err = -EBUSY;
if (!au_ftest_pin(p->flags, DI_LOCKED))
di_read_unlock(p->parent, AuLock_IR);
dput(p->parent);
p->parent = NULL;
goto out_err;
}
au_igrab(h_dir);
au_hn_imtx_lock_nested(p->hdir, p->lsc_hi);
if (unlikely(p->hdir->hi_inode != h_parent->d_inode)) {
err = -EBUSY;
goto out_unpin;
}
if (h_dentry) {
err = au_h_verify(h_dentry, p->udba, h_dir, h_parent, br);
if (unlikely(err)) {
au_fclr_pin(p->flags, MNT_WRITE);
goto out_unpin;
}
}
if (au_ftest_pin(p->flags, MNT_WRITE)) {
p->h_mnt = br->br_mnt;
err = mnt_want_write(p->h_mnt);
if (unlikely(err)) {
au_fclr_pin(p->flags, MNT_WRITE);
goto out_unpin;
}
}
goto out; /* success */
out_unpin:
au_unpin(p);
out_err:
pr_err("err %d\n", err);
err = au_busy_or_stale();
out:
return err;
}
static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
struct dentry *h_parent, void *arg)
{
int err, rerr;
aufs_bindex_t bopq, bstart;
struct path h_path;
struct dentry *parent;
struct inode *h_dir, *h_inode, *inode, *dir;
struct au_cpdown_dir_args *args = arg;
bstart = au_dbstart(dentry);
/* dentry is di-locked */
parent = dget_parent(dentry);
dir = parent->d_inode;
h_dir = h_parent->d_inode;
AuDebugOn(h_dir != au_h_iptr(dir, bdst));
IMustLock(h_dir);
err = au_lkup_neg(dentry, bdst);
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(args->flags, MADE_DIR);
bopq = au_dbdiropq(dentry);
au_fclr_cpdown(args->flags, WHED);
au_fclr_cpdown(args->flags, DIROPQ);
if (au_dbwh(dentry) == bdst)
au_fset_cpdown(args->flags, WHED);
if (!au_ftest_cpdown(args->flags, PARENT_OPQ) && bopq <= bdst)
au_fset_cpdown(args->flags, PARENT_OPQ);
h_inode = h_path.dentry->d_inode;
mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
if (au_ftest_cpdown(args->flags, WHED)) {
err = au_cpdown_dir_opq(dentry, bdst, args);
if (unlikely(err)) {
mutex_unlock(&h_inode->i_mutex);
goto out_dir;
}
}
err = au_cpdown_attr(&h_path, au_h_dptr(dentry, bstart));
mutex_unlock(&h_inode->i_mutex);
if (unlikely(err))
goto out_opq;
if (au_ftest_cpdown(args->flags, WHED)) {
err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst);
if (unlikely(err))
goto out_opq;
}
inode = dentry->d_inode;
if (au_ibend(inode) < bdst)
au_set_ibend(inode, bdst);
au_set_h_iptr(inode, bdst, au_igrab(h_inode),
au_hi_flags(inode, /*isdir*/1));
goto out; /* success */
/* revert */
out_opq:
if (au_ftest_cpdown(args->flags, DIROPQ)) {
mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
rerr = au_diropq_remove(dentry, bdst);
mutex_unlock(&h_inode->i_mutex);
if (unlikely(rerr)) {
AuIOErr("failed removing diropq for %.*s b%d (%d)\n",
AuDLNPair(dentry), bdst, rerr);
err = -EIO;
goto out;
}
}
out_dir:
if (au_ftest_cpdown(args->flags, MADE_DIR)) {
rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path);
if (unlikely(rerr)) {
AuIOErr("failed removing %.*s b%d (%d)\n",
AuDLNPair(dentry), bdst, rerr);
err = -EIO;
}
}
out_put:
au_set_h_dptr(dentry, bdst, NULL);
if (au_dbend(dentry) == bdst)
au_update_dbend(dentry);
out:
dput(parent);
return err;
}
int aufs_link(struct dentry *src_dentry, struct inode *dir,
struct dentry *dentry)
{
int err, rerr;
struct au_dtime dt;
struct au_link_args *a;
struct dentry *wh_dentry, *h_src_dentry;
struct inode *inode;
struct super_block *sb;
struct au_wr_dir_args wr_dir_args = {
/* .force_btgt = -1, */
.flags = AuWrDir_ADD_ENTRY
};
IMustLock(dir);
inode = src_dentry->d_inode;
IMustLock(inode);
err = -ENOMEM;
a = kzalloc(sizeof(*a), GFP_NOFS);
if (unlikely(!a))
goto out;
a->parent = dentry->d_parent; /* dir inode is locked */
err = aufs_read_and_write_lock2(dentry, src_dentry,
AuLock_NOPLM | AuLock_GEN);
if (unlikely(err))
goto out_kfree;
err = au_d_hashed_positive(src_dentry);
if (unlikely(err))
goto out_unlock;
err = au_d_may_add(dentry);
if (unlikely(err))
goto out_unlock;
a->src_parent = dget_parent(src_dentry);
wr_dir_args.force_btgt = au_ibstart(inode);
di_write_lock_parent(a->parent);
wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt);
wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin,
&wr_dir_args);
err = PTR_ERR(wh_dentry);
if (IS_ERR(wh_dentry))
goto out_parent;
err = 0;
sb = dentry->d_sb;
a->bdst = au_dbstart(dentry);
a->h_path.dentry = au_h_dptr(dentry, a->bdst);
a->h_path.mnt = au_sbr_mnt(sb, a->bdst);
a->bsrc = au_ibstart(inode);
h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
if (!h_src_dentry) {
a->bsrc = au_dbstart(src_dentry);
h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
AuDebugOn(!h_src_dentry);
} else if (IS_ERR(h_src_dentry))
goto out_parent;
if (au_opt_test(au_mntflags(sb), PLINK)) {
if (a->bdst < a->bsrc
/* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */)
err = au_cpup_or_link(src_dentry, a);
else
err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
&a->h_path);
dput(h_src_dentry);
} else {
/*
* copyup src_dentry to the branch we process,
* and then link(2) to it.
*/
dput(h_src_dentry);
if (a->bdst < a->bsrc
/* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) {
au_unpin(&a->pin);
di_write_unlock(a->parent);
err = au_cpup_before_link(src_dentry, a);
di_write_lock_parent(a->parent);
if (!err)
err = au_pin(&a->pin, dentry, a->bdst,
au_opt_udba(sb),
AuPin_DI_LOCKED | AuPin_MNT_WRITE);
if (unlikely(err))
goto out_wh;
}
if (!err) {
h_src_dentry = au_h_dptr(src_dentry, a->bdst);
err = -ENOENT;
if (h_src_dentry && h_src_dentry->d_inode)
err = vfsub_link(h_src_dentry,
au_pinned_h_dir(&a->pin),
&a->h_path);
}
}
if (unlikely(err))
goto out_unpin;
if (wh_dentry) {
a->h_path.dentry = wh_dentry;
err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path,
dentry);
if (unlikely(err))
goto out_revert;
}
dir->i_version++;
if (au_ibstart(dir) == au_dbstart(dentry))
au_cpup_attr_timesizes(dir);
inc_nlink(inode);
inode->i_ctime = dir->i_ctime;
d_instantiate(dentry, au_igrab(inode));
if (d_unhashed(a->h_path.dentry))
/* some filesystem calls d_drop() */
d_drop(dentry);
goto out_unpin; /* success */
out_revert:
rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, /*force*/0);
if (unlikely(rerr)) {
AuIOErr("%.*s reverting failed(%d, %d)\n",
AuDLNPair(dentry), err, rerr);
err = -EIO;
}
au_dtime_revert(&dt);
out_unpin:
au_unpin(&a->pin);
out_wh:
dput(wh_dentry);
out_parent:
di_write_unlock(a->parent);
dput(a->src_parent);
out_unlock:
if (unlikely(err)) {
au_update_dbstart(dentry);
d_drop(dentry);
}
aufs_read_and_write_unlock2(dentry, src_dentry);
out_kfree:
kfree(a);
out:
return err;
}
