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);
}
static void au_ren_refresh(struct au_ren_args *a)
{
aufs_bindex_t bend, bindex;
struct dentry *d, *h_d;
struct inode *i, *h_i;
struct super_block *sb;
d = a->dst_dentry;
d_drop(d);
if (a->h_dst)
/* already dget-ed by au_ren_or_cpup() */
au_set_h_dptr(d, a->btgt, a->h_dst);
i = a->dst_inode;
if (i) {
if (!au_ftest_ren(a->flags, ISDIR))
vfsub_drop_nlink(i);
else {
vfsub_dead_dir(i);
au_cpup_attr_timesizes(i);
}
au_update_dbrange(d, /*do_put_zero*/1);
} else {
bend = a->btgt;
for (bindex = au_dbstart(d); bindex < bend; bindex++)
au_set_h_dptr(d, bindex, NULL);
bend = au_dbend(d);
for (bindex = a->btgt + 1; bindex <= bend; bindex++)
au_set_h_dptr(d, bindex, NULL);
au_update_dbrange(d, /*do_put_zero*/0);
}
d = a->src_dentry;
au_set_dbwh(d, -1);
bend = au_dbend(d);
for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
h_d = au_h_dptr(d, bindex);
if (h_d)
au_set_h_dptr(d, bindex, NULL);
}
au_set_dbend(d, a->btgt);
sb = d->d_sb;
i = a->src_inode;
if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i))
return; /* success */
bend = au_ibend(i);
for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
h_i = au_h_iptr(i, bindex);
if (h_i) {
au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0);
/* ignore this error */
au_set_h_iptr(i, bindex, NULL, 0);
}
}
au_set_ibend(i, a->btgt);
}
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;
}
/*
* simple tests for the del-entry operations.
* following the checks in vfs, plus the parent-child relationship.
*/
int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_parent, int isdir)
{
int err;
umode_t h_mode;
struct dentry *h_dentry, *h_latest;
struct inode *h_inode;
h_dentry = au_h_dptr(dentry, bindex);
h_inode = h_dentry->d_inode;
if (dentry->d_inode) {
err = -ENOENT;
if (unlikely(!h_inode || !h_inode->i_nlink))
goto out;
h_mode = h_inode->i_mode;
if (!isdir) {
err = -EISDIR;
if (unlikely(S_ISDIR(h_mode)))
goto out;
} else if (unlikely(!S_ISDIR(h_mode))) {
err = -ENOTDIR;
goto out;
}
} else {
/* rename(2) case */
err = -EIO;
if (unlikely(h_inode))
goto out;
}
err = -ENOENT;
/* expected parent dir is locked */
if (unlikely(h_parent != h_dentry->d_parent))
goto out;
err = 0;
/*
* rmdir a dir may break the consistency on some filesystem.
* let's try heavy test.
*/
err = -EACCES;
if (unlikely(au_test_h_perm(h_parent->d_inode, MAY_EXEC | MAY_WRITE)))
goto out;
h_latest = au_sio_lkup_one(&dentry->d_name, h_parent,
au_sbr(dentry->d_sb, bindex));
err = -EIO;
if (IS_ERR(h_latest))
goto out;
if (h_latest == h_dentry)
err = 0;
dput(h_latest);
out:
return err;
}
static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent,
const unsigned char add_entry, aufs_bindex_t bcpup,
aufs_bindex_t bstart)
{
int err;
struct dentry *h_parent;
struct inode *h_dir;
if (add_entry)
IMustLock(parent->d_inode);
else
di_write_lock_parent(parent);
err = 0;
if (!au_h_dptr(parent, bcpup)) {
if (bstart < bcpup)
err = au_cpdown_dirs(dentry, bcpup);
else
err = au_cpup_dirs(dentry, bcpup);
}
if (!err && add_entry) {
h_parent = au_h_dptr(parent, bcpup);
h_dir = h_parent->d_inode;
mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
err = au_lkup_neg(dentry, bcpup);
/* todo: no unlock here */
mutex_unlock(&h_dir->i_mutex);
AuDbg("bcpup %d\n", bcpup);
if (!err) {
if (!dentry->d_inode)
au_set_h_dptr(dentry, bstart, NULL);
au_update_dbrange(dentry, /*do_put_zero*/0);
}
}
if (!add_entry)
di_write_unlock(parent);
if (!err)
err = bcpup; /* success */
AuTraceErr(err);
return err;
}
int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry)
{
aufs_bindex_t bindex, bend;
bend = au_dbend(dentry);
for (bindex = au_dbstart(dentry); bindex <= bend; bindex++)
if (au_h_dptr(dentry, bindex) == h_dentry)
return bindex;
return -1;
}
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 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;
struct iattr ia;
struct path h_path;
struct inode *h_isrc, *h_idst;
struct kstat *h_st;
h_path.dentry = au_h_dptr(dst, bindex);
h_idst = h_path.dentry->d_inode;
h_path.mnt = au_sbr_mnt(dst->d_sb, bindex);
h_isrc = h_src->d_inode;
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);
}
err = vfsub_notify_change(&h_path, &ia);
/* 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);
}
return err;
}
static int au_ren_lock(struct au_ren_args *a)
{
int err;
unsigned int udba;
err = 0;
a->src_h_parent = au_h_dptr(a->src_parent, a->btgt);
a->src_hdir = au_hi(a->src_dir, a->btgt);
a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt);
a->dst_hdir = au_hi(a->dst_dir, a->btgt);
a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir,
a->dst_h_parent, a->dst_hdir);
udba = au_opt_udba(a->src_dentry->d_sb);
if (unlikely(a->src_hdir->hi_inode != a->src_h_parent->d_inode
|| a->dst_hdir->hi_inode != a->dst_h_parent->d_inode))
err = au_busy_or_stale();
if (!err && au_dbstart(a->src_dentry) == a->btgt)
err = au_h_verify(a->src_h_dentry, udba,
a->src_h_parent->d_inode, a->src_h_parent,
a->br);
if (!err && au_dbstart(a->dst_dentry) == a->btgt)
err = au_h_verify(a->dst_h_dentry, udba,
a->dst_h_parent->d_inode, a->dst_h_parent,
a->br);
if (!err) {
err = mnt_want_write(a->br->br_mnt);
if (unlikely(err))
goto out_unlock;
au_fset_ren(a->flags, MNT_WRITE);
goto out; /* success */
}
err = au_busy_or_stale();
out_unlock:
au_ren_unlock(a);
out:
return err;
}
/* side effect: sets whlist and h_dentry */
static int au_ren_may_dir(struct au_ren_args *a)
{
int err;
unsigned int rdhash;
struct dentry *d;
d = a->dst_dentry;
SiMustAnyLock(d->d_sb);
err = 0;
if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) {
rdhash = au_sbi(d->d_sb)->si_rdhash;
if (!rdhash)
rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d));
err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS);
if (unlikely(err))
goto out;
au_set_dbstart(d, a->dst_bstart);
err = may_rename_dstdir(d, &a->whlist);
au_set_dbstart(d, a->btgt);
}
a->dst_h_dentry = au_h_dptr(d, au_dbstart(d));
if (unlikely(err))
goto out;
d = a->src_dentry;
a->src_h_dentry = au_h_dptr(d, au_dbstart(d));
if (au_ftest_ren(a->flags, ISDIR)) {
err = may_rename_srcdir(d, a->btgt);
if (unlikely(err)) {
au_nhash_wh_free(&a->whlist);
a->whlist.nh_num = 0;
}
}
out:
return err;
}
/*
* unlink the topmost h_dentry
* Note: the target file MAY be modified by UDBA between this mutex_unlock() and
* mutex_lock() in vfs_unlink(). in this case, such changes may be lost.
*/
static int au_do_unlink(const unsigned char dmsg, struct au_mvd_args *a)
{
int err;
struct path h_path;
h_path.mnt = au_sbr_mnt(a->sb, a->mvd_bsrc);
h_path.dentry = au_h_dptr(a->dentry, a->mvd_bsrc);
err = vfsub_unlink(a->mvd_h_src_dir, &h_path, /*force*/0);
if (unlikely(err))
AU_MVD_PR(dmsg, "unlink failed\n");
AuTraceErr(err);
return err;
}
int au_reopen_nondir(struct file *file)
{
int err;
struct dentry *dentry;
aufs_bindex_t bstart, bindex, bend;
struct file *hidden_file, *h_file_tmp;
dentry = file->f_dentry;
LKTRTrace("%.*s\n", DLNPair(dentry));
DEBUG_ON(S_ISDIR(dentry->d_inode->i_mode)
|| !au_h_dptr(dentry)->d_inode);
bstart = dbstart(dentry);
h_file_tmp = NULL;
if (fbstart(file) == bstart) {
hidden_file = au_h_fptr(file);
if (file->f_mode == hidden_file->f_mode)
return 0; /* success */
h_file_tmp = hidden_file;
get_file(h_file_tmp);
set_h_fptr(file, bstart, NULL);
}
DEBUG_ON(fbstart(file) < bstart
|| ftofi(file)->fi_hfile[0 + bstart].hf_file);
hidden_file = hidden_open(dentry, bstart, file->f_flags & ~O_TRUNC);
//if (LktrCond) {fput(hidden_file); br_put(stobr(dentry->d_sb, bstart));
//hidden_file = ERR_PTR(-1);}
err = PTR_ERR(hidden_file);
if (IS_ERR(hidden_file))
goto out; // close all?
err = 0;
//cpup_file_flags(hidden_file, file);
set_fbstart(file, bstart);
set_h_fptr(file, bstart, hidden_file);
memcpy(&hidden_file->f_ra, &file->f_ra, sizeof(file->f_ra)); //??
/* close lower files */
bend = fbend(file);
for (bindex = bstart + 1; bindex <= bend; bindex++)
set_h_fptr(file, bindex, NULL);
set_fbend(file, bstart);
out:
if (h_file_tmp)
fput(h_file_tmp);
TraceErr(err);
return err;
}
/* make the parent dir on bdst */
static int au_do_mkdir(const unsigned char dmsg, struct au_mvd_args *a)
{
int err;
err = 0;
a->mvd_hdir_src = au_hi(a->dir, a->mvd_bsrc);
a->mvd_hdir_dst = au_hi(a->dir, a->mvd_bdst);
a->mvd_h_src_parent = au_h_dptr(a->parent, a->mvd_bsrc);
a->mvd_h_dst_parent = NULL;
if (au_dbend(a->parent) >= a->mvd_bdst)
a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
if (!a->mvd_h_dst_parent) {
err = au_cpdown_dirs(a->dentry, a->mvd_bdst);
if (unlikely(err)) {
AU_MVD_PR(dmsg, "cpdown_dirs failed\n");
goto out;
}
a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
}
out:
AuTraceErr(err);
return err;
}
static noinline_for_stack
int au_do_h_d_reval(struct dentry *h_dentry, struct nameidata *nd,
struct dentry *dentry, aufs_bindex_t bindex)
{
int err, valid;
int (*reval)(struct dentry *, struct nameidata *);
err = 0;
reval = NULL;
if (h_dentry->d_op)
reval = h_dentry->d_op->d_revalidate;
if (!reval)
goto out;
AuDbg("b%d\n", bindex);
if (au_test_fs_null_nd(h_dentry->d_sb))
/* it may return tri-state */
valid = reval(h_dentry, NULL);
else {
struct nameidata h_nd;
int locked;
struct dentry *parent;
au_h_nd(&h_nd, nd);
parent = nd->path.dentry;
locked = (nd && nd->path.dentry != dentry);
if (locked)
di_read_lock_parent(parent, AuLock_IR);
BUG_ON(bindex > au_dbend(parent));
h_nd.path.dentry = au_h_dptr(parent, bindex);
BUG_ON(!h_nd.path.dentry);
h_nd.path.mnt = au_sbr(parent->d_sb, bindex)->br_mnt;
path_get(&h_nd.path);
valid = reval(h_dentry, &h_nd);
path_put(&h_nd.path);
if (locked)
di_read_unlock(parent, AuLock_IR);
}
if (unlikely(valid < 0))
err = valid;
else if (!valid)
err = -EINVAL;
out:
AuTraceErr(err);
return err;
}
static int do_open_dir(struct file *file, int flags, struct file *h_file)
{
int err;
aufs_bindex_t bindex, btail;
struct dentry *dentry, *h_dentry;
struct vfsmount *mnt;
FiMustWriteLock(file);
AuDebugOn(h_file);
err = 0;
mnt = file->f_path.mnt;
dentry = file->f_path.dentry;
file->f_version = d_inode(dentry)->i_version;
bindex = au_dbtop(dentry);
au_set_fbtop(file, bindex);
btail = au_dbtaildir(dentry);
au_set_fbbot_dir(file, btail);
for (; !err && bindex <= btail; bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (!h_dentry)
continue;
err = vfsub_test_mntns(mnt, h_dentry->d_sb);
if (unlikely(err))
break;
h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0);
if (IS_ERR(h_file)) {
err = PTR_ERR(h_file);
break;
}
au_set_h_fptr(file, bindex, h_file);
}
au_update_figen(file);
/* todo: necessary? */
/* file->f_ra = h_file->f_ra; */
if (!err)
return 0; /* success */
/* close all */
for (bindex = au_fbtop(file); bindex <= btail; bindex++)
au_set_h_fptr(file, bindex, NULL);
au_set_fbtop(file, -1);
au_set_fbbot_dir(file, -1);
return err;
}
loff_t au_dir_size(struct file *file, struct dentry *dentry)
{
loff_t sz;
aufs_bindex_t bindex, bend;
struct file *h_file;
struct dentry *h_dentry;
sz = 0;
if (file) {
AuDebugOn(!file->f_dentry);
AuDebugOn(!file->f_dentry->d_inode);
AuDebugOn(!S_ISDIR(file->f_dentry->d_inode->i_mode));
bend = au_fbend_dir(file);
for (bindex = au_fbstart(file);
bindex <= bend && sz < KMALLOC_MAX_SIZE;
bindex++) {
h_file = au_hf_dir(file, bindex);
if (h_file
&& h_file->f_dentry
&& h_file->f_dentry->d_inode)
sz += i_size_read(h_file->f_dentry->d_inode);
}
} else {
AuDebugOn(!dentry);
AuDebugOn(!dentry->d_inode);
AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode));
bend = au_dbtaildir(dentry);
for (bindex = au_dbstart(dentry);
bindex <= bend && sz < KMALLOC_MAX_SIZE;
bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (h_dentry && h_dentry->d_inode)
sz += i_size_read(h_dentry->d_inode);
}
}
if (sz < KMALLOC_MAX_SIZE)
sz = roundup_pow_of_two(sz);
if (sz > KMALLOC_MAX_SIZE)
sz = KMALLOC_MAX_SIZE;
else if (sz < NAME_MAX) {
BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX);
sz = AUFS_RDBLK_DEF;
}
return sz;
}
void au_update_dbend(struct dentry *dentry)
{
aufs_bindex_t bindex, bstart;
struct dentry *h_dentry;
bstart = au_dbstart(dentry);
for (bindex = au_dbend(dentry); bindex >= bstart; bindex--) {
h_dentry = au_h_dptr(dentry, bindex);
if (!h_dentry)
continue;
if (h_dentry->d_inode) {
au_set_dbend(dentry, bindex);
return;
}
au_set_h_dptr(dentry, bindex, NULL);
}
}
static int do_open_dir(struct file *file, int flags)
{
int err;
aufs_bindex_t bindex, btail;
struct dentry *dentry, *h_dentry;
struct file *h_file;
FiMustWriteLock(file);
dentry = file->f_dentry;
err = au_alive_dir(dentry);
if (unlikely(err))
goto out;
file->f_version = dentry->d_inode->i_version;
bindex = au_dbstart(dentry);
au_set_fbstart(file, bindex);
btail = au_dbtaildir(dentry);
au_set_fbend_dir(file, btail);
for (; !err && bindex <= btail; bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (!h_dentry)
continue;
h_file = au_h_open(dentry, bindex, flags, file);
if (IS_ERR(h_file)) {
err = PTR_ERR(h_file);
break;
}
au_set_h_fptr(file, bindex, h_file);
}
au_update_figen(file);
/* todo: necessary? */
/* file->f_ra = h_file->f_ra; */
if (!err)
return 0; /* success */
/* close all */
for (bindex = au_fbstart(file); bindex <= btail; bindex++)
au_set_h_fptr(file, bindex, NULL);
au_set_fbstart(file, -1);
au_set_fbend_dir(file, -1);
out:
return err;
}
/*
* when we have to copyup the renaming entry, do it with the rename-target name
* in order to minimize the cost (the later actual rename is unnecessary).
* otherwise rename it on the target branch.
*/
static int au_ren_or_cpup(struct au_ren_args *a)
{
int err;
struct dentry *d;
d = a->src_dentry;
if (au_dbstart(d) == a->btgt) {
a->h_path.dentry = a->dst_h_dentry;
if (au_ftest_ren(a->flags, DIROPQ)
&& au_dbdiropq(d) == a->btgt)
au_fclr_ren(a->flags, DIROPQ);
AuDebugOn(au_dbstart(d) != a->btgt);
err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt),
a->dst_h_dir, &a->h_path);
} else {
struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
struct file *h_file;
au_fset_ren(a->flags, CPUP);
mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
au_set_dbstart(d, a->btgt);
au_set_h_dptr(d, a->btgt, dget(a->dst_h_dentry));
h_file = au_h_open_pre(d, a->src_bstart);
if (IS_ERR(h_file)) {
err = PTR_ERR(h_file);
h_file = NULL;
} else
err = au_sio_cpup_single(d, a->btgt, a->src_bstart, -1,
!AuCpup_DTIME, a->dst_parent);
mutex_unlock(h_mtx);
au_h_open_post(d, a->src_bstart, h_file);
if (!err) {
d = a->dst_dentry;
au_set_h_dptr(d, a->btgt, NULL);
au_update_dbstart(d);
} else {
au_set_h_dptr(d, a->btgt, NULL);
au_set_dbstart(d, a->src_bstart);
}
}
if (!err && a->h_dst)
/* it will be set to dinfo later */
dget(a->h_dst);
return err;
}
/*
* extended version of au_h_dptr().
* returns a hashed and positive (or linkable) h_dentry in bindex, NULL, or
* error.
*/
struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex)
{
struct dentry *h_dentry;
struct inode *inode, *h_inode;
inode = dentry->d_inode;
AuDebugOn(!inode);
h_dentry = NULL;
if (au_dbstart(dentry) <= bindex
&& bindex <= au_dbend(dentry))
h_dentry = au_h_dptr(dentry, bindex);
if (h_dentry && !au_d_linkable(h_dentry)) {
dget(h_dentry);
goto out; /* success */
}
AuDebugOn(bindex < au_ibstart(inode));
AuDebugOn(au_ibend(inode) < bindex);
h_inode = au_h_iptr(inode, bindex);
h_dentry = d_find_alias(h_inode);
if (h_dentry) {
if (!IS_ERR(h_dentry)) {
if (!au_d_linkable(h_dentry))
goto out; /* success */
dput(h_dentry);
} else
goto out;
}
if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) {
h_dentry = au_plink_lkup(inode, bindex);
AuDebugOn(!h_dentry);
if (!IS_ERR(h_dentry)) {
if (!au_d_hashed_positive(h_dentry))
goto out; /* success */
dput(h_dentry);
h_dentry = NULL;
}
}
out:
AuDbgDentry(h_dentry);
return h_dentry;
}
static struct dentry *
au_h_dget_any(struct dentry *dentry, aufs_bindex_t *bindex)
{
struct dentry *h_dentry;
struct inode *inode, *h_inode;
struct super_block *sb;
aufs_bindex_t ib, db;
/* must be positive dentry */
inode = dentry->d_inode;
LKTRTrace("%.*s, i%lu\n", AuDLNPair(dentry), inode->i_ino);
sb = dentry->d_sb;
db = au_dbstart(dentry);
ib = au_ibstart(inode);
if (db == ib) {
*bindex = db;
h_dentry = dget(au_h_dptr(dentry, db));
if (h_dentry)
goto out; /* success */
}
*bindex = ib;
h_inode = au_h_iptr(inode, ib);
h_dentry = d_find_alias(h_inode);
if (h_dentry)
goto out; /* success */
#if 0
if (au_opt_test(au_mntflags(sb), PLINK)
&& au_plink_test(sb, inode)) {
h_dentry = au_plink_lkup(sb, ib, inode);
if (IS_ERR(h_dentry))
goto out;
AuDebugOn(!h_dentry->d_inode);
goto out; /* success */
}
#endif
h_dentry = dget(au_hi_wh(inode, ib));
out:
AuTraceErrPtr(h_dentry);
return h_dentry;
}
struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
int force_wr)
{
struct file *h_file;
struct dentry *h_dentry;
h_dentry = au_h_dptr(dentry, bindex);
AuDebugOn(!h_dentry);
AuDebugOn(!h_dentry->d_inode);
h_file = NULL;
if (au_test_hfsplus(h_dentry->d_sb)
&& S_ISREG(h_dentry->d_inode->i_mode))
h_file = au_h_open(dentry, bindex,
O_RDONLY | O_NOATIME | O_LARGEFILE,
/*file*/NULL, force_wr);
return h_file;
}
/*
* successful returns with iinfo write_locked
* minus: errno
* zero: success, matched
* plus: no error, but unmatched
*/
static int reval_inode(struct inode *inode, struct dentry *dentry)
{
int err;
unsigned int gen;
struct au_iigen iigen;
aufs_bindex_t bindex, bend;
struct inode *h_inode, *h_dinode;
/*
* before this function, if aufs got any iinfo lock, it must be only
* one, the parent dir.
* it can happen by UDBA and the obsoleted inode number.
*/
err = -EIO;
if (unlikely(inode->i_ino == parent_ino(dentry)))
goto out;
err = 1;
ii_write_lock_new_child(inode);
h_dinode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode;
bend = au_ibend(inode);
for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
h_inode = au_h_iptr(inode, bindex);
if (!h_inode || h_inode != h_dinode)
continue;
err = 0;
gen = au_iigen(inode, &iigen);
if (gen == au_digen(dentry)
&& !au_ig_ftest(iigen.ig_flags, HALF_REFRESHED))
break;
/* fully refresh inode using dentry */
err = au_refresh_hinode(inode, dentry);
if (!err)
au_update_iigen(inode, /*half*/0);
break;
}
if (unlikely(err))
ii_write_unlock(inode);
out:
return err;
}
/*
* simple tests for the adding inode operations.
* following the checks in vfs, plus the parent-child relationship.
*/
int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_parent, int isdir)
{
int err;
umode_t h_mode;
struct dentry *h_dentry;
struct inode *h_inode;
err = -ENAMETOOLONG;
if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
goto out;
h_dentry = au_h_dptr(dentry, bindex);
h_inode = h_dentry->d_inode;
if (!dentry->d_inode) {
err = -EEXIST;
if (unlikely(h_inode))
goto out;
} else {
/* rename(2) case */
err = -EIO;
if (unlikely(!h_inode || !h_inode->i_nlink))
goto out;
h_mode = h_inode->i_mode;
if (!isdir) {
err = -EISDIR;
if (unlikely(S_ISDIR(h_mode)))
goto out;
} else if (unlikely(!S_ISDIR(h_mode))) {
err = -ENOTDIR;
goto out;
}
}
err = 0;
/* expected parent dir is locked */
if (unlikely(h_parent != h_dentry->d_parent))
err = -EIO;
out:
AuTraceErr(err);
return err;
}
static noinline_for_stack
int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src,
struct au_hinode *hdir, struct vfsub_args *vargs)
{
int err, sbits;
struct dentry *h_dst;
struct iattr ia;
struct inode *h_isrc, *h_idst;
h_dst = au_h_dptr(dst, bindex);
LKTRTrace("%.*s\n", AuDLNPair(h_dst));
h_idst = h_dst->d_inode;
/* todo? IMustLock(h_idst); */
h_isrc = h_src->d_inode;
/* todo? IMustLock(h_isrc); */
ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID
| ATTR_ATIME | ATTR_MTIME
| ATTR_ATIME_SET | ATTR_MTIME_SET;
ia.ia_mode = h_isrc->i_mode;
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;
sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
au_cpup_attr_flags(h_idst, h_isrc);
vfsub_args_reinit(vargs);
vfsub_ign_hinode(vargs, IN_ATTRIB, hdir);
err = vfsub_notify_change(h_dst, &ia, vargs);
/* is this nfs only? */
if (!err && sbits && au_test_nfs(h_dst->d_sb)) {
ia.ia_valid = ATTR_FORCE | ATTR_MODE;
ia.ia_mode = h_isrc->i_mode;
vfsub_args_reinit(vargs);
vfsub_ign_hinode(vargs, IN_ATTRIB, hdir);
err = vfsub_notify_change(h_dst, &ia, vargs);
}
AuTraceErr(err);
return err;
}
/*
* the lifetime of branch is independent from the entry under sysfs.
* sysfs handles the lifetime of the entry, and never call ->show() after it is
* unlinked.
*/
static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
aufs_bindex_t bindex)
{
struct path path;
struct dentry *root;
struct au_branch *br;
AuDbg("b%d\n", bindex);
root = sb->s_root;
di_read_lock_parent(root, !AuLock_IR);
br = au_sbr(sb, bindex);
path.mnt = br->br_mnt;
path.dentry = au_h_dptr(root, bindex);
au_seq_path(seq, &path);
di_read_unlock(root, !AuLock_IR);
seq_printf(seq, "=%s\n", au_optstr_br_perm(br->br_perm));
return 0;
}
static int reopen_dir(struct file *file)
{
int err;
unsigned int flags;
aufs_bindex_t bindex, btail, bstart;
struct dentry *dentry, *h_dentry;
struct file *h_file;
/* open all lower dirs */
dentry = file->f_dentry;
bstart = au_dbstart(dentry);
for (bindex = au_fbstart(file); bindex < bstart; bindex++)
au_set_h_fptr(file, bindex, NULL);
au_set_fbstart(file, bstart);
btail = au_dbtaildir(dentry);
for (bindex = au_fbend_dir(file); btail < bindex; bindex--)
au_set_h_fptr(file, bindex, NULL);
au_set_fbend_dir(file, btail);
flags = vfsub_file_flags(file);
for (bindex = bstart; bindex <= btail; bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (!h_dentry)
continue;
h_file = au_hf_dir(file, bindex);
if (h_file)
continue;
h_file = au_h_open(dentry, bindex, flags, file);
err = PTR_ERR(h_file);
if (IS_ERR(h_file))
goto out; /* close all? */
au_set_h_fptr(file, bindex, h_file);
}
au_update_figen(file);
/* todo: necessary? */
/* file->f_ra = h_file->f_ra; */
err = 0;
out:
return err;
}
loff_t au_dir_size(struct file *file, struct dentry *dentry)
{
loff_t sz;
aufs_bindex_t bindex, bbot;
struct file *h_file;
struct dentry *h_dentry;
sz = 0;
if (file) {
AuDebugOn(!d_is_dir(file->f_path.dentry));
bbot = au_fbbot_dir(file);
for (bindex = au_fbtop(file);
bindex <= bbot && sz < KMALLOC_MAX_SIZE;
bindex++) {
h_file = au_hf_dir(file, bindex);
if (h_file && file_inode(h_file))
sz += vfsub_f_size_read(h_file);
}
} else {
AuDebugOn(!dentry);
AuDebugOn(!d_is_dir(dentry));
bbot = au_dbtaildir(dentry);
for (bindex = au_dbtop(dentry);
bindex <= bbot && sz < KMALLOC_MAX_SIZE;
bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (h_dentry && d_is_positive(h_dentry))
sz += i_size_read(d_inode(h_dentry));
}
}
if (sz < KMALLOC_MAX_SIZE)
sz = roundup_pow_of_two(sz);
if (sz > KMALLOC_MAX_SIZE)
sz = KMALLOC_MAX_SIZE;
else if (sz < NAME_MAX) {
BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX);
sz = AUFS_RDBLK_DEF;
}
return sz;
}
static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
struct au_opt_xino **opt_xino,
struct au_opts *opts)
{
int err;
aufs_bindex_t bend, bindex;
struct dentry *root, *parent, *h_root;
err = 0;
switch (opt->type) {
case Opt_xino:
err = au_xino_set(sb, &opt->xino,
!!au_ftest_opts(opts->flags, REMOUNT));
if (unlikely(err))
break;
*opt_xino = &opt->xino;
au_xino_brid_set(sb, -1);
/* safe d_parent access */
parent = opt->xino.file->f_dentry->d_parent;
root = sb->s_root;
bend = au_sbend(sb);
for (bindex = 0; bindex <= bend; bindex++) {
h_root = au_h_dptr(root, bindex);
if (h_root == parent) {
au_xino_brid_set(sb, au_sbr_id(sb, bindex));
break;
}
}
break;
case Opt_noxino:
au_xino_clr(sb);
au_xino_brid_set(sb, -1);
*opt_xino = (void *)-1;
break;
}
return err;
}
/*
* the lifetime of branch is independent from the entry under sysfs.
* sysfs handles the lifetime of the entry, and never call ->show() after it is
* unlinked.
*/
static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
aufs_bindex_t bindex, int idx)
{
int err;
struct path path;
struct dentry *root;
struct au_branch *br;
char *perm;
AuDbg("b%d\n", bindex);
err = 0;
root = sb->s_root;
di_read_lock_parent(root, !AuLock_IR);
br = au_sbr(sb, bindex);
switch (idx) {
case AuBrSysfs_BR:
path.mnt = au_br_mnt(br);
path.dentry = au_h_dptr(root, bindex);
au_seq_path(seq, &path);
di_read_unlock(root, !AuLock_IR);
perm = au_optstr_br_perm(br->br_perm);
if (perm) {
err = seq_printf(seq, "=%s\n", perm);
kfree(perm);
if (err == -1)
err = -E2BIG;
} else
err = -ENOMEM;
break;
case AuBrSysfs_BRID:
err = seq_printf(seq, "%d\n", br->br_id);
di_read_unlock(root, !AuLock_IR);
if (err == -1)
err = -E2BIG;
break;
}
return err;
}
