static int unionfs_unlink_whiteout(struct inode *dir, struct dentry *dentry)
{
struct dentry *hidden_dentry;
struct dentry *hidden_dir_dentry;
int bindex;
int err = 0;
print_entry_location();
if ((err = unionfs_partial_lookup(dentry)))
goto out;
bindex = dbstart(dentry);
hidden_dentry = dtohd_index(dentry, bindex);
if (!hidden_dentry)
goto out;
hidden_dir_dentry = lock_parent(hidden_dentry);
/* avoid destroying the hidden inode if the file is in use */
DGET(hidden_dentry);
if (!(err = is_robranch_super(dentry->d_sb, bindex)))
err = vfs_unlink(hidden_dir_dentry->d_inode, hidden_dentry);
DPUT(hidden_dentry);
fist_copy_attr_times(dir, hidden_dir_dentry->d_inode);
unlock_dir(hidden_dir_dentry);
if (err) {
if (!IS_COPYUP_ERR(err))
goto out;
}
if (err) {
if (dbstart(dentry) == 0) {
goto out;
}
err = create_whiteout(dentry, dbstart(dentry) - 1);
} else if (dbopaque(dentry) != -1) {
/* There is a hidden lower-priority file with the same name. */
err = create_whiteout(dentry, dbopaque(dentry));
} else {
err = create_whiteout(dentry, dbstart(dentry));
}
out:
if (!err)
dentry->d_inode->i_nlink--;
/* We don't want to leave negative leftover dentries for revalidate. */
if (!err && (dbopaque(dentry) != -1))
update_bstart(dentry);
print_exit_status(err);
return err;
}
int unionfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int err = 0;
struct unionfs_dir_state *namelist = NULL;
print_entry_location();
lock_dentry(dentry);
fist_print_dentry("IN unionfs_rmdir: ", dentry);
/* check if this unionfs directory is empty or not */
err = check_empty(dentry, &namelist);
if (err) {
goto out;
}
if (IS_SET(dir->i_sb, DELETE_WHITEOUT)) {
/* Delete the first directory. */
err = unionfs_rmdir_first(dir, dentry, namelist);
/* create whiteout */
if (!err) {
err = create_whiteout(dentry, dbstart(dentry));
} else {
int new_err;
if (dbstart(dentry) == 0)
goto out;
/* exit if the error returned was NOT -EROFS */
if (!IS_COPYUP_ERR(err))
goto out;
new_err = create_whiteout(dentry, dbstart(dentry) - 1);
if (new_err != -EEXIST)
err = new_err;
}
} else {
/* delete all. */
err = unionfs_rmdir_all(dir, dentry, namelist);
}
out:
/* call d_drop so the system "forgets" about us */
if (!err)
d_drop(dentry);
if (namelist)
free_rdstate(namelist);
unlock_dentry(dentry);
print_exit_status(err);
return err;
}
static int u2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
struct dentry *lower_dentry;
struct dentry *lower_dir_dentry;
int err;
struct path lower_path;
/* creating whiteout if directory was in read-only */
if((U2FS_D(dentry)->lower_path[LEFT].dentry) == NULL &&
(U2FS_D(dentry)->lower_path[LEFT].mnt) == NULL){
err = create_whiteout(dentry);
if(err)
err = -EIO;
goto out_whiteout;
}
u2fs_get_lower_path(dentry, &lower_path, LEFT);
lower_dentry = lower_path.dentry;
lower_dir_dentry = lock_parent(lower_dentry);
err = mnt_want_write(lower_path.mnt);
if (err)
goto out_unlock;
err = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
if (err)
goto out;
if (dentry->d_inode)
clear_nlink(dentry->d_inode);
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
out:
mnt_drop_write(lower_path.mnt);
out_unlock:
unlock_dir(lower_dir_dentry);
u2fs_put_lower_path(dentry, &lower_path);
/* creating whiteout if file as existing in both branches */
if((U2FS_D(dentry)->lower_path[RIGHT].dentry) != NULL &&
(U2FS_D(dentry)->lower_path[RIGHT].mnt) != NULL){
err = create_whiteout(dentry);
if(err)
err = -EIO;
}
d_drop(dentry);
out_whiteout:
return err;
}
int unionfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int err = 0;
struct unionfs_dir_state *namelist = NULL;
unionfs_lock_dentry(dentry);
/* check if this unionfs directory is empty or not */
err = check_empty(dentry, &namelist);
if (err)
goto out;
err = unionfs_rmdir_first(dir, dentry, namelist);
/* create whiteout */
if (!err)
err = create_whiteout(dentry, dbstart(dentry));
else {
int new_err;
if (dbstart(dentry) == 0)
goto out;
/* exit if the error returned was NOT -EROFS */
if (!IS_COPYUP_ERR(err))
goto out;
new_err = create_whiteout(dentry, dbstart(dentry) - 1);
if (new_err != -EEXIST)
err = new_err;
}
out:
/* call d_drop so the system "forgets" about us */
if (!err)
d_drop(dentry);
if (namelist)
free_rdstate(namelist);
unionfs_unlock_dentry(dentry);
return err;
}
int unionfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int err = 0;
struct unionfs_dir_state *namelist = NULL;
print_entry_location();
lock_dentry(dentry);
fist_print_dentry("IN unionfs_rmdir: ", dentry);
/* check if this unionfs directory is empty or not */
err = check_empty(dentry, &namelist);
if (err) {
#if 0
/* vfs_rmdir(our caller) unhashed the dentry. This will recover
* the Unionfs inode number for the directory itself, but the
* children are already lost. It seems that tmpfs manages its
* way around this by upping the refcount on everything.
*
* Even if we do this, we still lose the inode numbers of the
* children. The best way to fix this is to fix the VFS (or
* use persistent inode maps). */
if (d_unhashed(dentry))
d_rehash(dentry);
#endif
goto out;
}
#ifdef UNIONFS_DELETE_ALL
if (IS_SET(dir->i_sb, DELETE_ALL)) {
/* delete all. */
err = unionfs_rmdir_all(dir, dentry, namelist);
} else { /* Delete the first directory. */
#endif
err = unionfs_rmdir_first(dir, dentry, namelist);
/* create whiteout */
if (!err) {
err = create_whiteout(dentry, dbstart(dentry));
} else {
int new_err;
if (dbstart(dentry) == 0)
goto out;
/* exit if the error returned was NOT -EROFS */
if (!IS_COPYUP_ERR(err))
goto out;
new_err = create_whiteout(dentry, dbstart(dentry) - 1);
if (new_err != -EEXIST)
err = new_err;
}
#ifdef UNIONFS_DELETE_ALL
}
#endif
out:
/* call d_drop so the system "forgets" about us */
if (!err)
d_drop(dentry);
if (namelist)
free_rdstate(namelist);
unlock_dentry(dentry);
print_exit_status(err);
return err;
}
static int unionfs_unlink_all(struct inode *dir, struct dentry *dentry)
{
struct dentry *hidden_dentry;
struct dentry *hidden_dir_dentry;
int bstart, bend, bindex;
int err = 0;
int global_err = 0;
print_entry_location();
if ((err = unionfs_partial_lookup(dentry)))
goto out;
bstart = dbstart(dentry);
bend = dbend(dentry);
for (bindex = bend; bindex >= bstart; bindex--) {
hidden_dentry = dtohd_index(dentry, bindex);
if (!hidden_dentry)
continue;
hidden_dir_dentry = lock_parent(hidden_dentry);
/* avoid destroying the hidden inode if the file is in use */
DGET(hidden_dentry);
if (!(err = is_robranch_super(dentry->d_sb, bindex)))
err = vfs_unlink(hidden_dir_dentry->d_inode,
hidden_dentry);
DPUT(hidden_dentry);
fist_copy_attr_times(dir, hidden_dir_dentry->d_inode);
unlock_dir(hidden_dir_dentry);
if (err) {
/* passup the last error we got */
if (!IS_COPYUP_ERR(err))
goto out;
global_err = err;
}
}
/* check if encountered error in the above loop */
if (global_err) {
/* If we failed in the leftmost branch, then err will be set
* and we should move one over to create the whiteout.
* Otherwise, we should try in the leftmost branch. */
if (err) {
if (dbstart(dentry) == 0) {
goto out;
}
err = create_whiteout(dentry, dbstart(dentry) - 1);
} else {
err = create_whiteout(dentry, dbstart(dentry));
}
} else if (dbopaque(dentry) != -1) {
/* There is a hidden lower-priority file with the same name. */
err = create_whiteout(dentry, dbopaque(dentry));
}
out:
/* propagate number of hard-links */
if (dentry->d_inode->i_nlink != 0) {
dentry->d_inode->i_nlink = get_nlinks(dentry->d_inode);
if (!err && global_err)
dentry->d_inode->i_nlink--;
}
/* We don't want to leave negative leftover dentries for revalidate. */
if (!err && (global_err || dbopaque(dentry) != -1))
update_bstart(dentry);
print_exit_status(err);
return err;
}
static int unionfs_rmdir_all(struct inode *dir, struct dentry *dentry,
struct unionfs_dir_state *namelist)
{
struct dentry *hidden_dentry;
struct dentry *hidden_dir_dentry;
int bstart, bend, bindex;
int err = 0;
int global_err = 0;
print_entry_location();
fist_print_dentry("IN unionfs_rmdir_all: ", dentry);
bstart = dbstart(dentry);
bend = dbend(dentry);
for (bindex = bend; bindex >= bstart; bindex--) {
hidden_dentry = dtohd_index(dentry, bindex);
if (!hidden_dentry)
continue;
hidden_dir_dentry = lock_parent(hidden_dentry);
if (S_ISDIR(hidden_dentry->d_inode->i_mode)) {
delete_whiteouts(dentry, bindex, namelist);
if (!(err = is_robranch_super(dentry->d_sb, bindex))) {
err =
vfs_rmdir(hidden_dir_dentry->d_inode,
hidden_dentry);
}
} else {
err = -EISDIR;
}
fist_copy_attr_times(dir, hidden_dir_dentry->d_inode);
unlock_dir(hidden_dir_dentry);
if (err) {
int local_err =
unionfs_refresh_hidden_dentry(dentry, bindex);
if (local_err) {
err = local_err;
goto out;
}
if (!IS_COPYUP_ERR(err) && err != -ENOTEMPTY
&& err != -EISDIR)
goto out;
global_err = err;
}
}
/* check if encountered error in the above loop */
if (global_err) {
/* If we failed in the leftmost branch, then err will be set and we should
* move one over to create the whiteout. Otherwise, we should try in the
* leftmost branch.
*/
if (err) {
if (dbstart(dentry) == 0) {
goto out;
}
err = create_whiteout(dentry, dbstart(dentry) - 1);
} else {
err = create_whiteout(dentry, dbstart(dentry));
}
} else {
err = create_whiteout(dentry, dbstart(dentry));
}
out:
/* propagate number of hard-links */
dentry->d_inode->i_nlink = get_nlinks(dentry->d_inode);
fist_print_dentry("OUT unionfs_rmdir_all: ", dentry);
print_exit_status(err);
return err;
}
static int unionfs_unlink_whiteout(struct inode *dir, struct dentry *dentry)
{
int err = 0;
struct dentry *hidden_old_dentry;
struct dentry *hidden_wh_dentry = NULL;
struct dentry *hidden_old_dir_dentry, *hidden_new_dir_dentry;
char *name = NULL;
struct iattr newattrs;
print_entry_location();
fist_print_dentry("IN unionfs_unlink_whiteout: ", dentry);
/* create whiteout, get the leftmost underlying dentry and rename it */
hidden_old_dentry = dtohd(dentry);
/* lookup .wh.foo first, MUST NOT EXIST */
name = KMALLOC(dentry->d_name.len + sizeof(".wh."), GFP_UNIONFS);
if (!name) {
err = -ENOMEM;
goto out;
}
strcpy(name, ".wh.");
strncat(name, dentry->d_name.name, dentry->d_name.len);
name[4 + dentry->d_name.len] = '\0';
hidden_wh_dentry =
LOOKUP_ONE_LEN(name, hidden_old_dentry->d_parent,
dentry->d_name.len + 4);
if (IS_ERR(hidden_wh_dentry)) {
err = PTR_ERR(hidden_wh_dentry);
goto out;
}
ASSERT(hidden_wh_dentry->d_inode == NULL);
DGET(hidden_old_dentry);
hidden_old_dir_dentry = GET_PARENT(hidden_old_dentry);
hidden_new_dir_dentry = GET_PARENT(hidden_wh_dentry);
double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
if (!(err = is_robranch(dentry))) {
if (S_ISREG(hidden_old_dentry->d_inode->i_mode)) {
err = vfs_rename(hidden_old_dir_dentry->d_inode,
hidden_old_dentry,
hidden_new_dir_dentry->d_inode,
hidden_wh_dentry);
} else {
err = vfs_unlink(hidden_old_dir_dentry->d_inode,
hidden_old_dentry);
if (!err)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
err = vfs_create(hidden_new_dir_dentry->d_inode,
hidden_wh_dentry, 0666, NULL);
#else
err = vfs_create(hidden_new_dir_dentry->d_inode,
hidden_wh_dentry, 0666);
#endif
}
}
double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
DPUT(hidden_old_dentry);
DPUT(hidden_wh_dentry);
if (!err) {
hidden_wh_dentry = LOOKUP_ONE_LEN(name,
hidden_old_dentry->d_parent,
dentry->d_name.len + 4);
if (IS_ERR(hidden_wh_dentry)) {
err = PTR_ERR(hidden_wh_dentry);
goto out;
}
PASSERT(hidden_wh_dentry->d_inode);
down(&hidden_wh_dentry->d_inode->i_sem);
newattrs.ia_valid = ATTR_CTIME;
if (hidden_wh_dentry->d_inode->i_size != 0) {
newattrs.ia_valid |= ATTR_SIZE;
newattrs.ia_size = 0;
}
/* We discard this error, because the entry is whited out
* even if we fail here. */
notify_change(hidden_wh_dentry, &newattrs);
up(&hidden_wh_dentry->d_inode->i_sem);
DPUT(hidden_wh_dentry);
}
if (err) {
if (dbstart(dentry) == 0)
goto out;
/* exit if the error returned was NOT -EROFS */
if (!IS_COPYUP_ERR(err))
goto out;
err = create_whiteout(dentry, dbstart(dentry) - 1);
} else {
fist_copy_attr_all(dir, hidden_new_dir_dentry->d_inode);
}
out:
KFREE(name);
print_exit_status(err);
return err;
}
/*
* The locking rules in u2fs_rename are complex. We could use a simpler
* superblock-level name-space lock for renames and copy-ups.
*/
static int u2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
int err = 0;
struct dentry *lower_old_dentry = NULL;
struct dentry *lower_new_dentry = NULL;
struct dentry *lower_old_dir_dentry = NULL;
struct dentry *lower_new_dir_dentry = NULL;
struct dentry *trap = NULL;
struct dentry *ret = NULL;
struct path lower_old_path, lower_new_path;
/* creating parent directories if destination is read-only */
if((U2FS_D(old_dentry)->lower_path[LEFT].dentry) == NULL &&
(U2FS_D(old_dentry)->lower_path[LEFT].mnt) == NULL){
err = create_whiteout(old_dentry);
if(err){
err = -EIO;
goto out_copyup;
}
err = copyup_dentry(old_dir, old_dentry,
old_dentry->d_name.name, old_dentry->d_name.len,
NULL, i_size_read(old_dentry->d_inode));
if(err)
goto out_copyup;
}
if((U2FS_D(new_dentry)->lower_path[LEFT].dentry) == NULL &&
(U2FS_D(new_dentry)->lower_path[LEFT].mnt) == NULL){
ret = create_parents(new_dir, new_dentry,
new_dentry->d_name.name);
if (!ret || IS_ERR(ret)) {
err = PTR_ERR(ret);
if (!IS_COPYUP_ERR(err))
printk(KERN_ERR
"u2fs: create_parents for "
"u2fs_rename failed"
"err=%d\n", err);
goto out_copyup;
}
u2fs_postcopyup_setmnt(new_dentry);
u2fs_put_reset_lower_path(new_dentry, RIGHT);
if(err)
goto out_copyup;
}
u2fs_get_lower_path(old_dentry, &lower_old_path, LEFT);
u2fs_get_lower_path(new_dentry, &lower_new_path, LEFT);
lower_old_dentry = lower_old_path.dentry;
lower_new_dentry = lower_new_path.dentry;
lower_old_dir_dentry = dget_parent(lower_old_dentry);
lower_new_dir_dentry = dget_parent(lower_new_dentry);
trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
/* source should not be ancestor of target */
if (trap == lower_old_dentry) {
err = -EINVAL;
goto out;
}
/* target should not be ancestor of source */
if (trap == lower_new_dentry) {
err = -ENOTEMPTY;
goto out;
}
err = mnt_want_write(lower_old_path.mnt);
if (err)
goto out;
err = mnt_want_write(lower_new_path.mnt);
if (err)
goto out_drop_old_write;
err = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
lower_new_dir_dentry->d_inode, lower_new_dentry);
if (err)
goto out_err;
fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
fsstack_copy_inode_size(new_dir, lower_new_dir_dentry->d_inode);
if (new_dir != old_dir) {
fsstack_copy_attr_all(old_dir,
lower_old_dir_dentry->d_inode);
fsstack_copy_inode_size(old_dir,
lower_old_dir_dentry->d_inode);
}
out_err:
mnt_drop_write(lower_new_path.mnt);
out_drop_old_write:
mnt_drop_write(lower_old_path.mnt);
out:
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
dput(lower_old_dir_dentry);
dput(lower_new_dir_dentry);
u2fs_put_lower_path(old_dentry, &lower_old_path);
u2fs_put_lower_path(new_dentry, &lower_new_path);
out_copyup:
return err;
}
static int u2fs_unlink(struct inode *dir, struct dentry *dentry)
{
int err=0;
struct dentry *lower_dentry = NULL;
struct inode *lower_dir_inode;
struct inode *lower_inode;
struct dentry *lower_dir_dentry = NULL;
struct path lower_path;
/* creating whiteout if file unlinked from read-only branch */
if((U2FS_D(dentry)->lower_path[LEFT].dentry) == NULL &&
(U2FS_D(dentry)->lower_path[LEFT].mnt) == NULL){
err = create_whiteout(dentry);
if(err)
err = -EIO;
goto out_whiteout;
}
else{
u2fs_get_lower_path(dentry, &lower_path, LEFT);
lower_dir_inode = u2fs_lower_inode(dir, LEFT);
lower_inode = u2fs_lower_inode(dentry->d_inode, LEFT);
}
lower_dentry = lower_path.dentry;
dget(lower_dentry);
lower_dir_dentry = lock_parent(lower_dentry);
err = mnt_want_write(lower_path.mnt);
if (err)
goto out_unlock;
err = vfs_unlink(lower_dir_inode, lower_dentry);
/*
* Note: unlinking on top of NFS can cause silly-renamed files.
* Trying to delete such files results in EBUSY from NFS
* below. Silly-renamed files will get deleted by NFS later on, so
* we just need to detect them here and treat such EBUSY errors as
* if the upper file was successfully deleted.
*/
if (err == -EBUSY && lower_dentry->d_flags & DCACHE_NFSFS_RENAMED)
err = 0;
if (err)
goto out;
fsstack_copy_attr_times(dir, lower_dir_inode);
fsstack_copy_inode_size(dir, lower_dir_inode);
set_nlink(dentry->d_inode, lower_inode->i_nlink);
dentry->d_inode->i_ctime = dir->i_ctime;
out:
mnt_drop_write(lower_path.mnt);
out_unlock:
unlock_dir(lower_dir_dentry);
dput(lower_dentry);
u2fs_put_lower_path(dentry, &lower_path);
/* checking for same file in right branch */
if((U2FS_D(dentry)->lower_path[RIGHT].dentry) != NULL &&
(U2FS_D(dentry)->lower_path[RIGHT].mnt) != NULL){
err = create_whiteout(dentry);
if(err)
err = -EIO;
}
d_drop(dentry);
out_whiteout:
return err;
}
/*
* Main rename code. This is sufficiently complex, that it's documented in
* Documentation/filesystems/unionfs/rename.txt. This routine calls
* __unionfs_rename() above to perform some of the work.
*/
static int do_unionfs_rename(struct inode *old_dir,
struct dentry *old_dentry,
struct dentry *old_parent,
struct inode *new_dir,
struct dentry *new_dentry,
struct dentry *new_parent)
{
int err = 0;
int bindex, bwh_old;
int old_bstart, old_bend;
int new_bstart, new_bend;
int do_copyup = -1;
int local_err = 0;
int eio = 0;
int revert = 0;
old_bstart = dbstart(old_dentry);
bwh_old = old_bstart;
old_bend = dbend(old_dentry);
new_bstart = dbstart(new_dentry);
new_bend = dbend(new_dentry);
/* Rename source to destination. */
err = __unionfs_rename(old_dir, old_dentry, old_parent,
new_dir, new_dentry, new_parent,
old_bstart);
if (err) {
if (!IS_COPYUP_ERR(err))
goto out;
do_copyup = old_bstart - 1;
} else {
revert = 1;
}
/*
* Unlink all instances of destination that exist to the left of
* bstart of source. On error, revert back, goto out.
*/
for (bindex = old_bstart - 1; bindex >= new_bstart; bindex--) {
struct dentry *unlink_dentry;
struct dentry *unlink_dir_dentry;
BUG_ON(bindex < 0);
unlink_dentry = unionfs_lower_dentry_idx(new_dentry, bindex);
if (!unlink_dentry)
continue;
unlink_dir_dentry = lock_parent(unlink_dentry);
err = is_robranch_super(old_dir->i_sb, bindex);
if (!err)
err = vfs_unlink(unlink_dir_dentry->d_inode,
unlink_dentry);
fsstack_copy_attr_times(new_parent->d_inode,
unlink_dir_dentry->d_inode);
/* propagate number of hard-links */
new_parent->d_inode->i_nlink =
unionfs_get_nlinks(new_parent->d_inode);
unlock_dir(unlink_dir_dentry);
if (!err) {
if (bindex != new_bstart) {
dput(unlink_dentry);
unionfs_set_lower_dentry_idx(new_dentry,
bindex, NULL);
}
} else if (IS_COPYUP_ERR(err)) {
do_copyup = bindex - 1;
} else if (revert) {
goto revert;
}
}
if (do_copyup != -1) {
for (bindex = do_copyup; bindex >= 0; bindex--) {
/*
* copyup the file into some left directory, so that
* you can rename it
*/
err = copyup_dentry(old_parent->d_inode,
old_dentry, old_bstart, bindex,
old_dentry->d_name.name,
old_dentry->d_name.len, NULL,
i_size_read(old_dentry->d_inode));
/* if copyup failed, try next branch to the left */
if (err)
continue;
bwh_old = bindex;
err = __unionfs_rename(old_dir, old_dentry, old_parent,
new_dir, new_dentry, new_parent,
bindex);
break;
}
}
/* make it opaque */
if (S_ISDIR(old_dentry->d_inode->i_mode)) {
err = make_dir_opaque(old_dentry, dbstart(old_dentry));
if (err)
goto revert;
}
/*
* Create whiteout for source, only if:
* (1) There is more than one underlying instance of source.
* (2) We did a copy_up
*/
if ((old_bstart != old_bend) || (do_copyup != -1)) {
if (bwh_old < 0) {
printk(KERN_ERR "unionfs: rename error (bwh_old=%d)\n",
bwh_old);
err = -EIO;
goto out;
}
err = create_whiteout(old_dentry, bwh_old);
if (err) {
/* can't fix anything now, so we exit with -EIO */
printk(KERN_ERR "unionfs: can't create a whiteout for "
"%s in rename!\n", old_dentry->d_name.name);
err = -EIO;
}
}
out:
return err;
revert:
/* Do revert here. */
local_err = unionfs_refresh_lower_dentry(new_dentry, new_parent,
old_bstart);
if (local_err) {
printk(KERN_ERR "unionfs: revert failed in rename: "
"the new refresh failed\n");
eio = -EIO;
}
local_err = unionfs_refresh_lower_dentry(old_dentry, old_parent,
old_bstart);
if (local_err) {
printk(KERN_ERR "unionfs: revert failed in rename: "
"the old refresh failed\n");
eio = -EIO;
goto revert_out;
}
if (!unionfs_lower_dentry_idx(new_dentry, bindex) ||
!unionfs_lower_dentry_idx(new_dentry, bindex)->d_inode) {
printk(KERN_ERR "unionfs: revert failed in rename: "
"the object disappeared from under us!\n");
eio = -EIO;
goto revert_out;
}
if (unionfs_lower_dentry_idx(old_dentry, bindex) &&
unionfs_lower_dentry_idx(old_dentry, bindex)->d_inode) {
printk(KERN_ERR "unionfs: revert failed in rename: "
"the object was created underneath us!\n");
eio = -EIO;
goto revert_out;
}
local_err = __unionfs_rename(new_dir, new_dentry, new_parent,
old_dir, old_dentry, old_parent,
old_bstart);
/* If we can't fix it, then we cop-out with -EIO. */
if (local_err) {
printk(KERN_ERR "unionfs: revert failed in rename!\n");
eio = -EIO;
}
local_err = unionfs_refresh_lower_dentry(new_dentry, new_parent,
bindex);
if (local_err)
eio = -EIO;
local_err = unionfs_refresh_lower_dentry(old_dentry, old_parent,
bindex);
if (local_err)
eio = -EIO;
revert_out:
if (eio)
err = eio;
return err;
}
