#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/namei.h>
+#include <linux/mount.h>
static inline unsigned long time_to_jiffies(unsigned long sec,
unsigned long nsec)
struct inode *inode = entry->d_inode;
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req = fuse_get_request_nonint(fc);
+ struct fuse_req *req = fuse_get_request(fc);
if (!req)
return 0;
fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
- request_send_nonint(fc, req);
+ request_send(fc, req);
err = req->out.h.error;
if (!err) {
if (outarg.nodeid != get_node_id(inode)) {
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
fuse_lookup_init(req, dir, entry, &outarg);
request_send(fc, req);
err = req->out.h.error;
+ if (!err && (!outarg.nodeid || outarg.nodeid == FUSE_ROOT_ID))
+ err = -EIO;
if (!err) {
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
entry->d_time = jiffies - 1;
}
+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_open_in inarg;
+ struct fuse_open_out outopen;
+ struct fuse_entry_out outentry;
+ struct fuse_inode *fi;
+ struct fuse_file *ff;
+ struct file *file;
+ int flags = nd->intent.open.flags - 1;
+
+ err = -ENOSYS;
+ if (fc->no_create)
+ goto out;
+
+ err = -ENAMETOOLONG;
+ if (entry->d_name.len > FUSE_NAME_MAX)
+ goto out;
+
+ err = -EINTR;
+ req = fuse_get_request(fc);
+ if (!req)
+ goto out;
+
+ 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->inode = 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))
+ goto out_free_ff;
+
+ inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
+ &outentry.attr);
+ err = -ENOMEM;
+ if (!inode) {
+ flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
+ ff->fh = outopen.fh;
+ fuse_send_release(fc, ff, outentry.nodeid, NULL, flags, 0);
+ goto out_put_request;
+ }
+ fuse_put_request(fc, req);
+ entry->d_time = time_to_jiffies(outentry.entry_valid,
+ outentry.entry_valid_nsec);
+ fi = get_fuse_inode(inode);
+ fi->i_time = time_to_jiffies(outentry.attr_valid,
+ outentry.attr_valid_nsec);
+
+ d_instantiate(entry, inode);
+ file = lookup_instantiate_filp(nd, entry, generic_file_open);
+ if (IS_ERR(file)) {
+ ff->fh = outopen.fh;
+ fuse_send_release(fc, ff, outentry.nodeid, inode, flags, 0);
+ 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:
+ return err;
+}
+
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
struct inode *dir, struct dentry *entry,
int mode)
fuse_put_request(fc, req);
return err;
}
+ if (!outarg.nodeid || outarg.nodeid == FUSE_ROOT_ID) {
+ fuse_put_request(fc, req);
+ return -EIO;
+ }
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
if (!inode) {
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
static int fuse_create(struct inode *dir, struct dentry *entry, int mode,
struct nameidata *nd)
{
+ if (nd && (nd->flags & LOOKUP_CREATE)) {
+ int err = fuse_create_open(dir, entry, mode, nd);
+ if (err != -ENOSYS)
+ return err;
+ /* Fall back on mknod */
+ }
return fuse_mknod(dir, entry, mode, 0);
}
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_SYMLINK;
req->in.numargs = 2;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_UNLINK;
req->in.h.nodeid = get_node_id(dir);
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_RMDIR;
req->in.h.nodeid = get_node_id(dir);
struct fuse_conn *fc = get_fuse_conn(olddir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.newdir = get_node_id(newdir);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.oldnodeid = get_node_id(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_GETATTR;
req->in.h.nodeid = get_node_id(inode);
return err;
}
+/*
+ * Calling into a user-controlled filesystem gives the filesystem
+ * daemon ptrace-like capabilities over the requester process. This
+ * means, that the filesystem daemon is able to record the exact
+ * filesystem operations performed, and can also control the behavior
+ * of the requester process in otherwise impossible ways. For example
+ * it can delay the operation for arbitrary length of time allowing
+ * DoS against the requester.
+ *
+ * For this reason only those processes can call into the filesystem,
+ * for which the owner of the mount has ptrace privilege. This
+ * excludes processes started by other users, suid or sgid processes.
+ */
+static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
+{
+ if (fc->flags & FUSE_ALLOW_OTHER)
+ return 1;
+
+ if (task->euid == fc->user_id &&
+ task->suid == fc->user_id &&
+ task->uid == fc->user_id &&
+ task->egid == fc->group_id &&
+ task->sgid == fc->group_id &&
+ task->gid == fc->group_id)
+ return 1;
+
+ return 0;
+}
+
static int fuse_revalidate(struct dentry *entry)
{
struct inode *inode = entry->d_inode;
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
- if (get_node_id(inode) == FUSE_ROOT_ID) {
- if (!(fc->flags & FUSE_ALLOW_OTHER) &&
- current->fsuid != fc->user_id)
- return -EACCES;
- } else if (time_before_eq(jiffies, fi->i_time))
+ if (!fuse_allow_task(fc, current))
+ return -EACCES;
+ if (get_node_id(inode) != FUSE_ROOT_ID &&
+ time_before_eq(jiffies, fi->i_time))
return 0;
return fuse_do_getattr(inode);
}
+static int fuse_access(struct inode *inode, int mask)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_access_in inarg;
+ int err;
+
+ if (fc->no_access)
+ return 0;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -EINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.mask = mask;
+ req->in.h.opcode = FUSE_ACCESS;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err == -ENOSYS) {
+ fc->no_access = 1;
+ err = 0;
+ }
+ return err;
+}
+
static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
{
struct fuse_conn *fc = get_fuse_conn(inode);
- if (!(fc->flags & FUSE_ALLOW_OTHER) && current->fsuid != fc->user_id)
+ if (!fuse_allow_task(fc, current))
return -EACCES;
else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
int err = generic_permission(inode, mask, NULL);
return err;
} else {
int mode = inode->i_mode;
- if ((mask & MAY_WRITE) && IS_RDONLY(inode) &&
- (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
- return -EROFS;
if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
return -EACCES;
+
+ if (nd && (nd->flags & LOOKUP_ACCESS))
+ return fuse_access(inode, mask);
return 0;
}
}
return 0;
}
-static int fuse_checkdir(struct file *cfile, struct file *file)
+static inline size_t fuse_send_readdir(struct fuse_req *req, struct file *file,
+ struct inode *inode, loff_t pos,
+ size_t count)
{
- struct inode *inode;
- if (!cfile)
- return -EIO;
- inode = cfile->f_dentry->d_inode;
- if (!S_ISREG(inode->i_mode)) {
- fput(cfile);
- return -EIO;
- }
-
- file->private_data = cfile;
- return 0;
+ return fuse_send_read_common(req, file, inode, pos, count, 1);
}
-static int fuse_getdir(struct file *file)
+static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
{
+ int err;
+ size_t nbytes;
+ struct page *page;
struct inode *inode = file->f_dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_request(fc);
- struct fuse_getdir_out_i outarg;
- int err;
-
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
- req->in.h.opcode = FUSE_GETDIR;
- req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
- req->out.numargs = 1;
- req->out.args[0].size = sizeof(struct fuse_getdir_out);
- req->out.args[0].value = &outarg;
- request_send(fc, req);
+ page = alloc_page(GFP_KERNEL);
+ if (!page) {
+ fuse_put_request(fc, req);
+ return -ENOMEM;
+ }
+ req->num_pages = 1;
+ req->pages[0] = page;
+ nbytes = fuse_send_readdir(req, file, inode, file->f_pos, PAGE_SIZE);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err)
- err = fuse_checkdir(outarg.file, file);
- return err;
-}
-
-static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
-{
- struct file *cfile = file->private_data;
- char *buf;
- int ret;
-
- if (!cfile) {
- ret = fuse_getdir(file);
- if (ret)
- return ret;
-
- cfile = file->private_data;
- }
+ err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
+ filldir);
- buf = (char *) __get_free_page(GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- ret = kernel_read(cfile, file->f_pos, buf, PAGE_SIZE);
- if (ret > 0)
- ret = parse_dirfile(buf, ret, file, dstbuf, filldir);
-
- free_page((unsigned long) buf);
- return ret;
+ __free_page(page);
+ fuse_invalidate_attr(inode); /* atime changed */
+ return err;
}
static char *read_link(struct dentry *dentry)
char *link;
if (!req)
- return ERR_PTR(-ERESTARTNOINTR);
+ return ERR_PTR(-EINTR);
link = (char *) __get_free_page(GFP_KERNEL);
if (!link) {
link[req->out.args[0].size] = '\0';
out:
fuse_put_request(fc, req);
+ fuse_invalidate_attr(inode); /* atime changed */
return link;
}
static int fuse_dir_open(struct inode *inode, struct file *file)
{
- file->private_data = NULL;
- return 0;
+ return fuse_open_common(inode, file, 1);
}
static int fuse_dir_release(struct inode *inode, struct file *file)
{
- struct file *cfile = file->private_data;
-
- if (cfile)
- fput(cfile);
+ return fuse_release_common(inode, file, 1);
+}
- return 0;
+static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync)
+{
+ /* nfsd can call this with no file */
+ return file ? fuse_fsync_common(file, de, datasync, 1) : 0;
}
-static unsigned iattr_to_fattr(struct iattr *iattr, struct fuse_attr *fattr)
+static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
{
unsigned ivalid = iattr->ia_valid;
- unsigned fvalid = 0;
-
- memset(fattr, 0, sizeof(*fattr));
if (ivalid & ATTR_MODE)
- fvalid |= FATTR_MODE, fattr->mode = iattr->ia_mode;
+ arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
if (ivalid & ATTR_UID)
- fvalid |= FATTR_UID, fattr->uid = iattr->ia_uid;
+ arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
if (ivalid & ATTR_GID)
- fvalid |= FATTR_GID, fattr->gid = iattr->ia_gid;
+ arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
if (ivalid & ATTR_SIZE)
- fvalid |= FATTR_SIZE, fattr->size = iattr->ia_size;
+ arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
/* You can only _set_ these together (they may change by themselves) */
if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) {
- fvalid |= FATTR_ATIME | FATTR_MTIME;
- fattr->atime = iattr->ia_atime.tv_sec;
- fattr->mtime = iattr->ia_mtime.tv_sec;
+ arg->valid |= FATTR_ATIME | FATTR_MTIME;
+ arg->atime = iattr->ia_atime.tv_sec;
+ arg->mtime = iattr->ia_mtime.tv_sec;
+ }
+ if (ivalid & ATTR_FILE) {
+ struct fuse_file *ff = iattr->ia_file->private_data;
+ arg->valid |= FATTR_FH;
+ arg->fh = ff->fh;
}
-
- return fvalid;
}
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
- inarg.valid = iattr_to_fattr(attr, &inarg.attr);
+ iattr_to_fattr(attr, &inarg);
req->in.h.opcode = FUSE_SETATTR;
req->in.h.nodeid = get_node_id(inode);
req->inode = inode;
struct nameidata *nd)
{
struct inode *inode;
- int err = fuse_lookup_iget(dir, entry, &inode);
+ int err;
+
+ err = fuse_lookup_iget(dir, entry, &inode);
if (err)
return ERR_PTR(err);
if (inode && S_ISDIR(inode->i_mode)) {
/* Don't allow creating an alias to a directory */
struct dentry *alias = d_find_alias(inode);
- if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
+ if (alias) {
dput(alias);
iput(inode);
return ERR_PTR(-EIO);
}
}
- return d_splice_alias(inode, entry);
+ d_add(entry, inode);
+ return NULL;
}
static int fuse_setxattr(struct dentry *entry, const char *name,
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_REMOVEXATTR;
req->in.h.nodeid = get_node_id(inode);
.readdir = fuse_readdir,
.open = fuse_dir_open,
.release = fuse_dir_release,
+ .fsync = fuse_dir_fsync,
};
static struct inode_operations fuse_common_inode_operations = {
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