int iterate_dir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
int res = -ENOTDIR;
if (!file->f_op->iterate)
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
res = mutex_lock_killable(&inode->i_mutex);
if (res)
goto out;
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
ctx->pos = file->f_pos;
res = file->f_op->iterate(file, ctx);
file->f_pos = ctx->pos;
fsnotify_access(file);
file_accessed(file);
}
mutex_unlock(&inode->i_mutex);
out:
return res;
}
static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
{
struct coda_file_info *cfi;
struct file *host_file;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op)
return -ENOTDIR;
if (host_file->f_op->readdir)
{
struct inode *host_inode = host_file->f_path.dentry->d_inode;
mutex_lock(&host_inode->i_mutex);
host_file->f_pos = coda_file->f_pos;
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->readdir(host_file, buf, filldir);
file_accessed(host_file);
}
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
}
else
ret = coda_venus_readdir(coda_file, buf, filldir);
return ret;
}
int vfs_readdir64(struct file *file, filldir64_t filler, void *buf)
{
struct file_operations_ext *fxops;
struct inode *inode = file->f_dentry->d_inode;
int res = -ENOTDIR;
if (!file->f_op || !file->f_op->readdir)
goto out;
res = -ENOSYS;
if (!IS_INO64(inode))
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
fxops = (struct file_operations_ext *) file->f_op;
down(&inode->i_sem);
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
res = fxops->readdir64(file, buf, filler);
file_accessed(file);
}
up(&inode->i_sem);
out:
return res;
}
/* copy of may_create in fs/namei.c() */
static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
{
if (child->d_inode)
return -EEXIST;
if (IS_DEADDIR(dir))
return -ENOENT;
return inode_permission(dir, MAY_WRITE | MAY_EXEC);
}
static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino,
ino_t dir_ino)
{
struct dentry *dentry, *d;
struct inode *inode;
au_gen_t sigen;
LKTRTrace("i%lu, diri%lu\n",
(unsigned long)ino, (unsigned long)dir_ino);
dentry = NULL;
inode = ilookup(sb, ino);
if (!inode)
goto out;
dentry = ERR_PTR(-ESTALE);
sigen = au_sigen(sb);
if (unlikely(is_bad_inode(inode)
|| IS_DEADDIR(inode)
|| sigen != au_iigen(inode)))
goto out_iput;
dentry = NULL;
if (!dir_ino || S_ISDIR(inode->i_mode))
dentry = d_find_alias(inode);
else {
spin_lock(&dcache_lock);
list_for_each_entry(d, &inode->i_dentry, d_alias)
if (!au_test_anon(d)
&& d->d_parent->d_inode->i_ino == dir_ino) {
dentry = dget_locked(d);
break;
}
spin_unlock(&dcache_lock);
}
if (unlikely(dentry && sigen != au_digen(dentry))) {
dput(dentry);
dentry = ERR_PTR(-ESTALE);
}
out_iput:
iput(inode);
out:
AuTraceErrPtr(dentry);
return dentry;
}
int vfs_readdir(struct file *file, filldir_t filler, void *buf)
{
struct inode *inode = file->f_dentry->d_inode;
int res = -ENOTDIR;
if (!file->f_op || !file->f_op->readdir)
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
down(&inode->i_sem);
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
res = file->f_op->readdir(file, buf, filler);
}
up(&inode->i_sem);
out:
return res;
}
/* file operations for directories */
int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
{
struct dentry *coda_dentry = coda_file->f_path.dentry;
struct coda_file_info *cfi;
struct file *host_file;
struct inode *host_inode;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
coda_vfs_stat.readdir++;
host_inode = host_file->f_path.dentry->d_inode;
mutex_lock(&host_inode->i_mutex);
host_file->f_pos = coda_file->f_pos;
if (!host_file->f_op->readdir) {
/* Venus: we must read Venus dirents from the file */
ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry);
} else {
/* potemkin case: we were handed a directory inode. */
/* Yuk, we can't call vfs_readdir because we are already
* holding the inode semaphore. */
ret = -ENOTDIR;
if (!host_file->f_op || !host_file->f_op->readdir)
goto out;
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->readdir(host_file, filldir, dirent);
file_accessed(host_file);
}
}
out:
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
return ret;
}
int iterate_dir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
bool shared = false;
int res = -ENOTDIR;
if (file->f_op->iterate_shared)
shared = true;
else if (!file->f_op->iterate)
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
if (shared)
res = down_read_killable(&inode->i_rwsem);
else
res = down_write_killable(&inode->i_rwsem);
if (res)
goto out;
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
ctx->pos = file->f_pos;
if (shared)
res = file->f_op->iterate_shared(file, ctx);
else
res = file->f_op->iterate(file, ctx);
file->f_pos = ctx->pos;
fsnotify_access(file);
file_accessed(file);
}
if (shared)
inode_unlock_shared(inode);
else
inode_unlock(inode);
out:
return res;
}
/* file operations for directories */
static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
{
struct coda_file_info *cfi;
struct file *host_file;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op)
return -ENOTDIR;
if (host_file->f_op->readdir)
{
/* potemkin case: we were handed a directory inode.
* We can't use vfs_readdir because we have to keep the file
* position in sync between the coda_file and the host_file.
* and as such we need grab the inode mutex. */
struct inode *host_inode = host_file->f_path.dentry->d_inode;
mutex_lock(&host_inode->i_mutex);
host_file->f_pos = coda_file->f_pos;
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->readdir(host_file, buf, filldir);
file_accessed(host_file);
}
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
}
else /* Venus: we must read Venus dirents from a file */
ret = coda_venus_readdir(coda_file, buf, filldir);
return ret;
}
int vfs_readdir(struct file *file, filldir_t filler, void *buf)
{
struct inode *inode = file->f_path.dentry->d_inode;
int res = -ENOTDIR;
if (!file->f_op || !file->f_op->readdir)
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
mutex_lock(&inode->i_mutex);
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
res = file->f_op->readdir(file, buf, filler);
#ifndef CONFIG_FS_ALL_NOATIME
file_accessed(file);
#endif
}
mutex_unlock(&inode->i_mutex);
out:
return res;
}
/* file operations for directories */
static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
{
struct coda_file_info *cfi;
struct file *host_file;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (host_file->f_op->iterate) {
struct inode *host_inode = file_inode(host_file);
mutex_lock(&host_inode->i_mutex);
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->iterate(host_file, ctx);
file_accessed(host_file);
}
mutex_unlock(&host_inode->i_mutex);
return ret;
}
/* Venus: we must read Venus dirents from a file */
return coda_venus_readdir(coda_file, ctx);
}
int vfs_readdir(struct file *file, filldir_t filler, void *buf)
{
struct inode *inode = file_inode(file);
int res = -ENOTDIR;
if (!file->f_op || !file->f_op->readdir)
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
res = mutex_lock_killable(&inode->i_mutex);
if (res)
goto out;
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
res = file->f_op->readdir(file, buf, filler);
file_accessed(file);
}
mutex_unlock(&inode->i_mutex);
out:
return res;
}
int ncp_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
int result = 0;
__le32 info_mask;
struct nw_modify_dos_info info;
struct ncp_server *server;
result = -EIO;
server = NCP_SERVER(inode);
if (!server) /* How this could happen? */
goto out;
result = -EPERM;
if (IS_DEADDIR(d_inode(dentry)))
goto out;
/* ageing the dentry to force validation */
ncp_age_dentry(server, dentry);
result = inode_change_ok(inode, attr);
if (result < 0)
goto out;
result = -EPERM;
if ((attr->ia_valid & ATTR_UID) && !uid_eq(attr->ia_uid, server->m.uid))
goto out;
if ((attr->ia_valid & ATTR_GID) && !gid_eq(attr->ia_gid, server->m.gid))
goto out;
if (((attr->ia_valid & ATTR_MODE) &&
(attr->ia_mode &
~(S_IFREG | S_IFDIR | S_IRWXUGO))))
goto out;
info_mask = 0;
memset(&info, 0, sizeof(info));
#if 1
if ((attr->ia_valid & ATTR_MODE) != 0)
{
umode_t newmode = attr->ia_mode;
info_mask |= DM_ATTRIBUTES;
if (S_ISDIR(inode->i_mode)) {
newmode &= server->m.dir_mode;
} else {
#ifdef CONFIG_NCPFS_EXTRAS
if (server->m.flags & NCP_MOUNT_EXTRAS) {
/* any non-default execute bit set */
if (newmode & ~server->m.file_mode & S_IXUGO)
info.attributes |= aSHARED | aSYSTEM;
/* read for group/world and not in default file_mode */
else if (newmode & ~server->m.file_mode & S_IRUGO)
info.attributes |= aSHARED;
} else
#endif
newmode &= server->m.file_mode;
}
if (newmode & S_IWUGO)
info.attributes &= ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);
else
info.attributes |= (aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);
#ifdef CONFIG_NCPFS_NFS_NS
if (ncp_is_nfs_extras(server, NCP_FINFO(inode)->volNumber)) {
result = ncp_modify_nfs_info(server,
NCP_FINFO(inode)->volNumber,
NCP_FINFO(inode)->dirEntNum,
attr->ia_mode, 0);
if (result != 0)
goto out;
info.attributes &= ~(aSHARED | aSYSTEM);
{
/* mark partial success */
struct iattr tmpattr;
tmpattr.ia_valid = ATTR_MODE;
tmpattr.ia_mode = attr->ia_mode;
setattr_copy(inode, &tmpattr);
mark_inode_dirty(inode);
}
}
#endif
}
#endif
/* Do SIZE before attributes, otherwise mtime together with size does not work...
*/
if ((attr->ia_valid & ATTR_SIZE) != 0) {
int written;
ncp_dbg(1, "trying to change size to %llu\n", attr->ia_size);
if ((result = ncp_make_open(inode, O_WRONLY)) < 0) {
result = -EACCES;
goto out;
}
ncp_write_kernel(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
attr->ia_size, 0, "", &written);
/* According to ndir, the changes only take effect after
closing the file */
ncp_inode_close(inode);
result = ncp_make_closed(inode);
if (result)
goto out;
if (attr->ia_size != i_size_read(inode)) {
truncate_setsize(inode, attr->ia_size);
mark_inode_dirty(inode);
}
}
if ((attr->ia_valid & ATTR_CTIME) != 0) {
info_mask |= (DM_CREATE_TIME | DM_CREATE_DATE);
ncp_date_unix2dos(attr->ia_ctime.tv_sec,
&info.creationTime, &info.creationDate);
}
if ((attr->ia_valid & ATTR_MTIME) != 0) {
info_mask |= (DM_MODIFY_TIME | DM_MODIFY_DATE);
ncp_date_unix2dos(attr->ia_mtime.tv_sec,
&info.modifyTime, &info.modifyDate);
}
if ((attr->ia_valid & ATTR_ATIME) != 0) {
__le16 dummy;
info_mask |= (DM_LAST_ACCESS_DATE);
ncp_date_unix2dos(attr->ia_atime.tv_sec,
&dummy, &info.lastAccessDate);
}
if (info_mask != 0) {
result = ncp_modify_file_or_subdir_dos_info(NCP_SERVER(inode),
inode, info_mask, &info);
if (result != 0) {
if (info_mask == (DM_CREATE_TIME | DM_CREATE_DATE)) {
/* NetWare seems not to allow this. I
do not know why. So, just tell the
user everything went fine. This is
a terrible hack, but I do not know
how to do this correctly. */
result = 0;
} else
goto out;
}
#ifdef CONFIG_NCPFS_STRONG
if ((!result) && (info_mask & DM_ATTRIBUTES))
NCP_FINFO(inode)->nwattr = info.attributes;
#endif
}
if (result)
goto out;
setattr_copy(inode, attr);
mark_inode_dirty(inode);
out:
if (result > 0)
result = -EACCES;
return result;
}
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;
}
/* todo: return with unlocked? */
struct inode *au_new_inode(struct dentry *dentry, int must_new)
{
struct inode *inode, *h_inode;
struct dentry *h_dentry;
struct super_block *sb;
struct mutex *mtx;
ino_t h_ino, ino;
int err;
aufs_bindex_t bstart;
sb = dentry->d_sb;
bstart = au_dbstart(dentry);
h_dentry = au_h_dptr(dentry, bstart);
h_inode = h_dentry->d_inode;
h_ino = h_inode->i_ino;
/*
* stop 'race'-ing between hardlinks under different
* parents.
*/
mtx = NULL;
if (!S_ISDIR(h_inode->i_mode))
mtx = &au_sbr(sb, bstart)->br_xino.xi_nondir_mtx;
new_ino:
if (mtx)
mutex_lock(mtx);
err = au_xino_read(sb, bstart, h_ino, &ino);
inode = ERR_PTR(err);
if (unlikely(err))
goto out;
if (!ino) {
ino = au_xino_new_ino(sb);
if (unlikely(!ino)) {
inode = ERR_PTR(-EIO);
goto out;
}
}
AuDbg("i%lu\n", (unsigned long)ino);
inode = au_iget_locked(sb, ino);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out;
AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
if (inode->i_state & I_NEW) {
/* verbose coding for lock class name */
if (unlikely(S_ISLNK(h_inode->i_mode)))
au_rw_class(&au_ii(inode)->ii_rwsem,
au_lc_key + AuLcSymlink_IIINFO);
else if (unlikely(S_ISDIR(h_inode->i_mode)))
au_rw_class(&au_ii(inode)->ii_rwsem,
au_lc_key + AuLcDir_IIINFO);
else /* likely */
au_rw_class(&au_ii(inode)->ii_rwsem,
au_lc_key + AuLcNonDir_IIINFO);
ii_write_lock_new_child(inode);
err = set_inode(inode, dentry);
if (!err) {
unlock_new_inode(inode);
goto out; /* success */
}
/*
* iget_failed() calls iput(), but we need to call
* ii_write_unlock() after iget_failed(). so dirty hack for
* i_count.
*/
atomic_inc(&inode->i_count);
iget_failed(inode);
ii_write_unlock(inode);
au_xino_write(sb, bstart, h_ino, /*ino*/0);
/* ignore this error */
goto out_iput;
} else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) {
/*
* horrible race condition between lookup, readdir and copyup
* (or something).
*/
if (mtx)
mutex_unlock(mtx);
err = reval_inode(inode, dentry);
if (unlikely(err < 0)) {
mtx = NULL;
goto out_iput;
}
if (!err) {
mtx = NULL;
goto out; /* success */
} else if (mtx)
mutex_lock(mtx);
}
if (unlikely(au_test_fs_unique_ino(h_dentry->d_inode)))
AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir,"
" b%d, %s, %pd, hi%lu, i%lu.\n",
bstart, au_sbtype(h_dentry->d_sb), dentry,
(unsigned long)h_ino, (unsigned long)ino);
ino = 0;
err = au_xino_write(sb, bstart, h_ino, /*ino*/0);
if (!err) {
iput(inode);
if (mtx)
mutex_unlock(mtx);
goto new_ino;
}
out_iput:
iput(inode);
inode = ERR_PTR(err);
out:
if (mtx)
mutex_unlock(mtx);
return inode;
}
static int au_rdu(struct file *file, struct aufs_rdu *rdu)
{
int err;
aufs_bindex_t bend;
struct au_rdu_arg arg;
struct dentry *dentry;
struct inode *inode;
struct file *h_file;
struct au_rdu_cookie *cookie = &rdu->cookie;
err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz);
if (unlikely(err)) {
err = -EFAULT;
AuTraceErr(err);
goto out;
}
rdu->rent = 0;
rdu->tail = rdu->ent;
rdu->full = 0;
arg.rdu = rdu;
arg.ent = rdu->ent;
arg.end = arg.ent.ul;
arg.end += rdu->sz;
err = -ENOTDIR;
if (unlikely(!file->f_op || !file->f_op->readdir))
goto out;
err = security_file_permission(file, MAY_READ);
AuTraceErr(err);
if (unlikely(err))
goto out;
dentry = file->f_dentry;
inode = dentry->d_inode;
#if 1
mutex_lock(&inode->i_mutex);
#else
err = mutex_lock_killable(&inode->i_mutex);
AuTraceErr(err);
if (unlikely(err))
goto out;
#endif
err = -ENOENT;
if (unlikely(IS_DEADDIR(inode)))
goto out_mtx;
arg.sb = inode->i_sb;
si_read_lock(arg.sb, AuLock_FLUSH);
fi_read_lock(file);
err = -EAGAIN;
if (unlikely(au_ftest_rdu(cookie->flags, CONT)
&& cookie->generation != au_figen(file)))
goto out_unlock;
err = 0;
if (!rdu->blk) {
rdu->blk = au_sbi(arg.sb)->si_rdblk;
if (!rdu->blk)
rdu->blk = au_dir_size(file, /*dentry*/NULL);
}
bend = au_fbstart(file);
if (cookie->bindex < bend)
cookie->bindex = bend;
bend = au_fbend_dir(file);
/* AuDbg("b%d, b%d\n", cookie->bindex, bend); */
for (; !err && cookie->bindex <= bend;
cookie->bindex++, cookie->h_pos = 0) {
h_file = au_hf_dir(file, cookie->bindex);
if (!h_file)
continue;
au_fclr_rdu(cookie->flags, FULL);
err = au_rdu_do(h_file, &arg);
AuTraceErr(err);
if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err))
break;
}
AuDbg("rent %llu\n", rdu->rent);
if (!err && !au_ftest_rdu(cookie->flags, CONT)) {
rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH);
au_fset_rdu(cookie->flags, CONT);
cookie->generation = au_figen(file);
}
ii_read_lock_child(inode);
fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode)));
ii_read_unlock(inode);
out_unlock:
fi_read_unlock(file);
si_read_unlock(arg.sb);
out_mtx:
mutex_unlock(&inode->i_mutex);
out:
AuTraceErr(err);
return err;
}
/*
* if valid returns 1, otherwise 0.
*/
static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
int valid, err;
unsigned int sigen;
unsigned char do_udba;
struct super_block *sb;
struct inode *inode;
valid = 0;
if (unlikely(!au_di(dentry)))
goto out;
valid = 1;
sb = dentry->d_sb;
inode = dentry->d_inode;
/*
* todo: very ugly
* i_mutex of parent dir may be held,
* but we should not return 'invalid' due to busy.
*/
err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM);
if (unlikely(err)) {
valid = err;
AuTraceErr(err);
goto out;
}
if (unlikely(au_dbrange_test(dentry))) {
err = -EINVAL;
AuTraceErr(err);
goto out_dgrade;
}
sigen = au_sigen(sb);
if (au_digen_test(dentry, sigen)) {
AuDebugOn(IS_ROOT(dentry));
err = au_reval_dpath(dentry, sigen);
if (unlikely(err)) {
AuTraceErr(err);
goto out_dgrade;
}
}
di_downgrade_lock(dentry, AuLock_IR);
err = -EINVAL;
if (inode && (IS_DEADDIR(inode) || !inode->i_nlink))
goto out_inval;
do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
if (do_udba && inode) {
aufs_bindex_t bstart = au_ibstart(inode);
struct inode *h_inode;
if (bstart >= 0) {
h_inode = au_h_iptr(inode, bstart);
if (h_inode && au_test_higen(inode, h_inode))
goto out_inval;
}
}
err = h_d_revalidate(dentry, inode, nd, do_udba);
if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) {
err = -EIO;
AuDbg("both of real entry and whiteout found, %.*s, err %d\n",
AuDLNPair(dentry), err);
}
goto out_inval;
out_dgrade:
di_downgrade_lock(dentry, AuLock_IR);
out_inval:
aufs_read_unlock(dentry, AuLock_IR);
AuTraceErr(err);
valid = !err;
out:
if (!valid) {
AuDbg("%.*s invalid, %d\n", AuDLNPair(dentry), valid);
d_drop(dentry);
}
return valid;
}
/*
* if valid returns 1, otherwise 0.
*/
static int aufs_d_revalidate(struct dentry *dentry, unsigned int flags)
{
int valid, err;
unsigned int sigen;
unsigned char do_udba;
struct super_block *sb;
struct inode *inode;
/* todo: support rcu-walk? */
if (flags & LOOKUP_RCU)
return -ECHILD;
valid = 0;
if (unlikely(!au_di(dentry)))
goto out;
valid = 1;
sb = dentry->d_sb;
/*
* todo: very ugly
* i_mutex of parent dir may be held,
* but we should not return 'invalid' due to busy.
*/
err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM);
if (unlikely(err)) {
valid = err;
AuTraceErr(err);
goto out;
}
inode = NULL;
if (d_really_is_positive(dentry))
inode = d_inode(dentry);
if (unlikely(inode && is_bad_inode(inode))) {
err = -EINVAL;
AuTraceErr(err);
goto out_dgrade;
}
if (unlikely(au_dbrange_test(dentry))) {
err = -EINVAL;
AuTraceErr(err);
goto out_dgrade;
}
sigen = au_sigen(sb);
if (au_digen_test(dentry, sigen)) {
AuDebugOn(IS_ROOT(dentry));
err = au_reval_dpath(dentry, sigen);
if (unlikely(err)) {
AuTraceErr(err);
goto out_dgrade;
}
}
di_downgrade_lock(dentry, AuLock_IR);
err = -EINVAL;
if (!(flags & (LOOKUP_OPEN | LOOKUP_EMPTY))
&& inode
&& !(inode->i_state && I_LINKABLE)
&& (IS_DEADDIR(inode) || !inode->i_nlink))
goto out_inval;
do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
if (do_udba && inode) {
aufs_bindex_t bstart = au_ibstart(inode);
struct inode *h_inode;
if (bstart >= 0) {
h_inode = au_h_iptr(inode, bstart);
if (h_inode && au_test_higen(inode, h_inode))
goto out_inval;
}
}
err = h_d_revalidate(dentry, inode, flags, do_udba);
if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) {
err = -EIO;
AuDbg("both of real entry and whiteout found, %p, err %d\n",
dentry, err);
}
goto out_inval;
out_dgrade:
di_downgrade_lock(dentry, AuLock_IR);
out_inval:
aufs_read_unlock(dentry, AuLock_IR);
AuTraceErr(err);
valid = !err;
out:
if (!valid) {
AuDbg("%pd invalid, %d\n", dentry, valid);
d_drop(dentry);
}
return valid;
}
int aufs_rmdir(struct inode *dir, struct dentry *dentry)
{
int err, rmdir_later;
aufs_bindex_t bwh, bindex, bstart;
struct au_dtime dt;
struct au_pin pin;
struct inode *inode;
struct dentry *parent, *wh_dentry, *h_dentry;
struct au_whtmp_rmdir *args;
IMustLock(dir);
err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
if (unlikely(err))
goto out;
/* VFS already unhashes it */
inode = dentry->d_inode;
err = -ENOENT;
if (unlikely(!inode || !inode->i_nlink
|| IS_DEADDIR(inode)))
goto out_unlock;
IMustLock(inode);
err = -ENOTDIR;
if (unlikely(!S_ISDIR(inode->i_mode)))
goto out_unlock; /* possible? */
err = -ENOMEM;
args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
if (unlikely(!args))
goto out_unlock;
parent = dentry->d_parent; /* dir inode is locked */
di_write_lock_parent(parent);
err = au_test_empty(dentry, &args->whlist);
if (unlikely(err))
goto out_parent;
bstart = au_dbstart(dentry);
bwh = au_dbwh(dentry);
bindex = -1;
wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin);
err = PTR_ERR(wh_dentry);
if (IS_ERR(wh_dentry))
goto out_parent;
h_dentry = au_h_dptr(dentry, bstart);
dget(h_dentry);
rmdir_later = 0;
if (bindex == bstart) {
err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir);
if (err > 0) {
rmdir_later = err;
err = 0;
}
} else {
/* stop monitoring */
au_hn_free(au_hi(inode, bstart));
/* dir inode is locked */
IMustLock(wh_dentry->d_parent->d_inode);
err = 0;
}
if (!err) {
vfsub_dead_dir(inode);
au_set_dbdiropq(dentry, -1);
epilog(dir, dentry, bindex);
if (rmdir_later) {
au_whtmp_kick_rmdir(dir, bstart, h_dentry, args);
args = NULL;
}
goto out_unpin; /* success */
}
/* revert */
AuLabel(revert);
if (wh_dentry) {
int rerr;
rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt);
if (rerr)
err = rerr;
}
out_unpin:
au_unpin(&pin);
dput(wh_dentry);
dput(h_dentry);
out_parent:
di_write_unlock(parent);
if (args)
au_whtmp_rmdir_free(args);
out_unlock:
aufs_read_unlock(dentry, AuLock_DW);
out:
AuTraceErr(err);
return err;
}
