/*
* Code shared between mknod, mkdir, symlink and link
*/
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
struct inode *dir, struct dentry *entry,
int mode)
{
struct fuse_entry_out outarg;
struct inode *inode;
int err;
req->in.h.nodeid = get_node_id(dir);
req->inode = dir;
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
request_send(fc, req);
err = req->out.h.error;
if (err) {
fuse_put_request(fc, req);
return err;
}
err = -EIO;
if (invalid_nodeid(outarg.nodeid))
goto out_put_request;
if ((outarg.attr.mode ^ mode) & S_IFMT)
goto out_put_request;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
if (!inode) {
fuse_send_forget(fc, req, outarg.nodeid, 1);
return -ENOMEM;
}
fuse_put_request(fc, req);
if (dir_alias(inode)) {
iput(inode);
return -EIO;
}
d_instantiate(entry, inode);
fuse_change_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
out_put_request:
fuse_put_request(fc, req);
return err;
}
/*
* Check whether the dentry is still valid
*
* If the entry validity timeout has expired and the dentry is
* positive, try to redo the lookup. If the lookup results in a
* different inode, then let the VFS invalidate the dentry and redo
* the lookup once more. If the lookup results in the same inode,
* then refresh the attributes, timeouts and mark the dentry valid.
*/
static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
{
struct inode *inode = entry->d_inode;
if (inode && is_bad_inode(inode))
return 0;
else if (time_after(jiffies, entry->d_time)) {
int err;
struct fuse_entry_out outarg;
struct fuse_conn *fc;
struct fuse_req *req;
/* Doesn't hurt to "reset" the validity timeout */
fuse_invalidate_entry_cache(entry);
if (!inode)
return 0;
fc = get_fuse_conn(inode);
req = fuse_get_request(fc);
if (!req)
return 0;
fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
request_send(fc, req);
err = req->out.h.error;
/* Zero nodeid is same as -ENOENT */
if (!err && !outarg.nodeid)
err = -ENOENT;
if (!err) {
struct fuse_inode *fi = get_fuse_inode(inode);
if (outarg.nodeid != get_node_id(inode)) {
fuse_send_forget(fc, req, outarg.nodeid, 1);
return 0;
}
fi->nlookup ++;
}
fuse_put_request(fc, req);
if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
return 0;
fuse_change_attributes(inode, &outarg.attr);
fuse_change_timeout(entry, &outarg);
}
return 1;
}
/*
* Code shared between mknod, mkdir, symlink and link
*/
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
struct inode *dir, struct dentry *entry,
int mode)
{
struct fuse_entry_out outarg;
struct inode *inode;
int err;
struct fuse_req *forget_req;
forget_req = fuse_get_req(fc);
if (IS_ERR(forget_req)) {
fuse_put_request(fc, req);
return PTR_ERR(forget_req);
}
memset(&outarg, 0, sizeof(outarg));
req->in.h.nodeid = get_node_id(dir);
req->out.numargs = 1;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
fuse_request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err)
goto out_put_forget_req;
err = -EIO;
if (invalid_nodeid(outarg.nodeid))
goto out_put_forget_req;
if ((outarg.attr.mode ^ mode) & S_IFMT)
goto out_put_forget_req;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr, entry_attr_timeout(&outarg), 0);
if (!inode) {
fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
return -ENOMEM;
}
fuse_put_request(fc, forget_req);
if (S_ISDIR(inode->i_mode)) {
struct dentry *alias;
mutex_lock(&fc->inst_mutex);
alias = d_find_alias(inode);
if (alias) {
/* New directory must have moved since mkdir */
mutex_unlock(&fc->inst_mutex);
dput(alias);
iput(inode);
return -EBUSY;
}
d_instantiate(entry, inode);
mutex_unlock(&fc->inst_mutex);
} else
d_instantiate(entry, inode);
fuse_change_entry_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
out_put_forget_req:
fuse_put_request(fc, forget_req);
return err;
}
/*
* Atomic create+open operation
*
* If the filesystem doesn't support this, then fall back to separate
* 'mknod' + 'open' requests.
*/
static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
struct nameidata *nd)
{
int err;
struct inode *inode;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_req *forget_req;
struct fuse_create_in inarg;
struct fuse_open_out outopen;
struct fuse_entry_out outentry;
struct fuse_file *ff;
struct file *file;
int flags = nd->intent.open.flags - 1;
if (fc->no_create)
return -ENOSYS;
if (flags & O_DIRECT)
return -EINVAL;
forget_req = fuse_get_req(fc);
if (IS_ERR(forget_req))
return PTR_ERR(forget_req);
req = fuse_get_req(fc);
err = PTR_ERR(req);
if (IS_ERR(req))
goto out_put_forget_req;
err = -ENOMEM;
ff = fuse_file_alloc(fc);
if (!ff)
goto out_put_request;
if (!fc->dont_mask)
mode &= ~current_umask();
flags &= ~O_NOCTTY;
memset(&inarg, 0, sizeof(inarg));
memset(&outentry, 0, sizeof(outentry));
inarg.flags = flags;
inarg.mode = mode;
inarg.umask = current_umask();
req->in.h.opcode = FUSE_CREATE;
req->in.h.nodeid = get_node_id(dir);
req->in.numargs = 2;
req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
sizeof(inarg);
req->in.args[0].value = &inarg;
req->in.args[1].size = entry->d_name.len + 1;
req->in.args[1].value = entry->d_name.name;
req->out.numargs = 2;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(outentry);
req->out.args[0].value = &outentry;
req->out.args[1].size = sizeof(outopen);
req->out.args[1].value = &outopen;
fuse_request_send(fc, req);
err = req->out.h.error;
if (err) {
if (err == -ENOSYS)
fc->no_create = 1;
goto out_free_ff;
}
err = -EIO;
if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
goto out_free_ff;
fuse_put_request(fc, req);
ff->fh = outopen.fh;
ff->nodeid = outentry.nodeid;
ff->open_flags = outopen.open_flags;
inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
&outentry.attr, entry_attr_timeout(&outentry), 0);
if (!inode) {
flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
fuse_sync_release(ff, flags);
fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
return -ENOMEM;
}
fuse_put_request(fc, forget_req);
d_instantiate(entry, inode);
fuse_change_entry_timeout(entry, &outentry);
fuse_invalidate_attr(dir);
file = lookup_instantiate_filp(nd, entry, generic_file_open);
if (IS_ERR(file)) {
fuse_sync_release(ff, flags);
return PTR_ERR(file);
}
file->private_data = fuse_file_get(ff);
fuse_finish_open(inode, file);
return 0;
out_free_ff:
fuse_file_free(ff);
out_put_request:
fuse_put_request(fc, req);
out_put_forget_req:
fuse_put_request(fc, forget_req);
return err;
}
/*
* Check whether the dentry is still valid
*
* If the entry validity timeout has expired and the dentry is
* positive, try to redo the lookup. If the lookup results in a
* different inode, then let the VFS invalidate the dentry and redo
* the lookup once more. If the lookup results in the same inode,
* then refresh the attributes, timeouts and mark the dentry valid.
*/
static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
{
struct inode *inode = entry->d_inode;
if (inode && is_bad_inode(inode))
return 0;
else if (fuse_dentry_time(entry) < get_jiffies_64()) {
int err;
struct fuse_entry_out outarg;
struct fuse_conn *fc;
struct fuse_req *req;
struct fuse_req *forget_req;
struct dentry *parent;
u64 attr_version;
/* For negative dentries, always do a fresh lookup */
if (!inode)
return 0;
fc = get_fuse_conn(inode);
req = fuse_get_req(fc);
if (IS_ERR(req))
return 0;
forget_req = fuse_get_req(fc);
if (IS_ERR(forget_req)) {
fuse_put_request(fc, req);
return 0;
}
attr_version = fuse_get_attr_version(fc);
parent = dget_parent(entry);
fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
&entry->d_name, &outarg);
fuse_request_send(fc, req);
dput(parent);
err = req->out.h.error;
fuse_put_request(fc, req);
/* Zero nodeid is same as -ENOENT */
if (!err && !outarg.nodeid)
err = -ENOENT;
if (!err) {
struct fuse_inode *fi = get_fuse_inode(inode);
if (outarg.nodeid != get_node_id(inode)) {
fuse_send_forget(fc, forget_req,
outarg.nodeid, 1);
return 0;
}
spin_lock(&fc->lock);
fi->nlookup++;
spin_unlock(&fc->lock);
}
fuse_put_request(fc, forget_req);
if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
return 0;
fuse_change_attributes(inode, &outarg.attr,
entry_attr_timeout(&outarg),
attr_version);
fuse_change_entry_timeout(entry, &outarg);
}
return 1;
}
/*
* Atomic create+open operation
*
* If the filesystem doesn't support this, then fall back to separate
* 'mknod' + 'open' requests.
*/
static int fuse_create_open(struct _inode *dir, struct dentry *entry, int mode,
struct nameidata *nd)
{
int err;
struct inode *inode;
struct _inode *_inode;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_req *forget_req;
struct fuse_open_in inarg;
struct fuse_open_out outopen;
struct fuse_entry_out outentry;
struct fuse_file *ff;
struct file *file;
int flags = nd->intent.open.flags - 1;
if (fc->no_create)
return -ENOSYS;
forget_req = fuse_get_req(fc);
if (IS_ERR(forget_req))
return PTR_ERR(forget_req);
req = fuse_get_req(fc);
err = PTR_ERR(req);
if (IS_ERR(req))
goto out_put_forget_req;
err = -ENOMEM;
ff = fuse_file_alloc();
if (!ff)
goto out_put_request;
flags &= ~O_NOCTTY;
memset(&inarg, 0, sizeof(inarg));
inarg.flags = flags;
inarg.mode = mode;
req->in.h.opcode = FUSE_CREATE;
req->in.h.nodeid = _get_node_id(dir);
req->in.numargs = 2;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
req->in.args[1].size = entry->d_name.len + 1;
req->in.args[1].value = entry->d_name.name;
req->out.numargs = 2;
req->out.args[0].size = sizeof(outentry);
req->out.args[0].value = &outentry;
req->out.args[1].size = sizeof(outopen);
req->out.args[1].value = &outopen;
request_send(fc, req);
err = req->out.h.error;
if (err) {
if (err == -ENOSYS)
fc->no_create = 1;
goto out_free_ff;
}
err = -EIO;
if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
goto out_free_ff;
fuse_put_request(fc, req);
inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
&outentry.attr);
if (!inode) {
flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
ff->fh = outopen.fh;
fuse_sync_release(fc, ff, outentry.nodeid, flags);
fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
return -ENOMEM;
}
_inode = tx_cache_get_inode(inode);
fuse_put_request(fc, forget_req);
d_instantiate(entry, _inode);
fuse_change_timeout(entry, &outentry);
file = lookup_instantiate_filp(nd, entry, generic_file_open);
if (IS_ERR(file)) {
ff->fh = outopen.fh;
fuse_sync_release(fc, ff, outentry.nodeid, flags);
return PTR_ERR(file);
}
fuse_finish_open(_inode, file, ff, &outopen);
return 0;
out_free_ff:
fuse_file_free(ff);
out_put_request:
fuse_put_request(fc, req);
out_put_forget_req:
fuse_put_request(fc, forget_req);
return err;
}
static struct dentry *fuse_lookup(struct _inode *dir, struct dentry *entry,
struct nameidata *nd)
{
int err;
struct fuse_entry_out outarg;
struct inode *inode = NULL;
struct _inode *_inode = NULL;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_req *forget_req;
if (entry->d_name.len > FUSE_NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
req = fuse_get_req(fc);
if (IS_ERR(req))
return ERR_PTR(PTR_ERR(req));
forget_req = fuse_get_req(fc);
if (IS_ERR(forget_req)) {
fuse_put_request(fc, req);
return ERR_PTR(PTR_ERR(forget_req));
}
fuse_lookup_init(req, dir, entry, &outarg);
request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
/* Zero nodeid is same as -ENOENT, but with valid timeout */
if (!err && outarg.nodeid &&
(invalid_nodeid(outarg.nodeid) ||
!fuse_valid_type(outarg.attr.mode)))
err = -EIO;
if (!err && outarg.nodeid) {
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
if (!inode) {
fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
return ERR_PTR(-ENOMEM);
}
}
fuse_put_request(fc, forget_req);
if (err && err != -ENOENT)
return ERR_PTR(err);
_inode = tx_cache_get_inode(inode);
if (inode && S_ISDIR(_inode->i_mode)) {
mutex_lock(&fc->inst_mutex);
err = fuse_d_add_directory(entry, _inode);
mutex_unlock(&fc->inst_mutex);
if (err) {
iput(inode);
return ERR_PTR(err);
}
} else
d_add(entry, _inode);
entry->d_op = &fuse_dentry_operations;
if (!err)
fuse_change_timeout(entry, &outarg);
else
fuse_invalidate_entry_cache(entry);
return NULL;
}