dir.c 32.7 KB
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/*
  FUSE: Filesystem in Userspace
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  Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>
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  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.
*/

#include "fuse_i.h"

#include <linux/pagemap.h>
#include <linux/file.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/namei.h>

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#if BITS_PER_LONG >= 64
static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
{
	entry->d_time = time;
}

static inline u64 fuse_dentry_time(struct dentry *entry)
{
	return entry->d_time;
}
#else
/*
 * On 32 bit archs store the high 32 bits of time in d_fsdata
 */
static void fuse_dentry_settime(struct dentry *entry, u64 time)
{
	entry->d_time = time;
	entry->d_fsdata = (void *) (unsigned long) (time >> 32);
}

static u64 fuse_dentry_time(struct dentry *entry)
{
	return (u64) entry->d_time +
		((u64) (unsigned long) entry->d_fsdata << 32);
}
#endif

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/*
 * FUSE caches dentries and attributes with separate timeout.  The
 * time in jiffies until the dentry/attributes are valid is stored in
 * dentry->d_time and fuse_inode->i_time respectively.
 */

/*
 * Calculate the time in jiffies until a dentry/attributes are valid
 */
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static u64 time_to_jiffies(unsigned long sec, unsigned long nsec)
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{
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	if (sec || nsec) {
		struct timespec ts = {sec, nsec};
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		return get_jiffies_64() + timespec_to_jiffies(&ts);
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	} else
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		return 0;
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}

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/*
 * Set dentry and possibly attribute timeouts from the lookup/mk*
 * replies
 */
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static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o)
{
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	fuse_dentry_settime(entry,
		time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
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	if (entry->d_inode)
		get_fuse_inode(entry->d_inode)->i_time =
			time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
}

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/*
 * Mark the attributes as stale, so that at the next call to
 * ->getattr() they will be fetched from userspace
 */
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void fuse_invalidate_attr(struct inode *inode)
{
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	get_fuse_inode(inode)->i_time = 0;
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}

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/*
 * Just mark the entry as stale, so that a next attempt to look it up
 * will result in a new lookup call to userspace
 *
 * This is called when a dentry is about to become negative and the
 * timeout is unknown (unlink, rmdir, rename and in some cases
 * lookup)
 */
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static void fuse_invalidate_entry_cache(struct dentry *entry)
{
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	fuse_dentry_settime(entry, 0);
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}

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/*
 * Same as fuse_invalidate_entry_cache(), but also try to remove the
 * dentry from the hash
 */
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static void fuse_invalidate_entry(struct dentry *entry)
{
	d_invalidate(entry);
	fuse_invalidate_entry_cache(entry);
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}

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static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
			     struct dentry *entry,
			     struct fuse_entry_out *outarg)
{
	req->in.h.opcode = FUSE_LOOKUP;
	req->in.h.nodeid = get_node_id(dir);
	req->in.numargs = 1;
	req->in.args[0].size = entry->d_name.len + 1;
	req->in.args[0].value = entry->d_name.name;
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(struct fuse_entry_out);
	req->out.args[0].value = outarg;
}

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/*
 * 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.
 */
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static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
{
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	struct inode *inode = entry->d_inode;

	if (inode && is_bad_inode(inode))
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		return 0;
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	else if (fuse_dentry_time(entry) < get_jiffies_64()) {
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		int err;
		struct fuse_entry_out outarg;
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		struct fuse_conn *fc;
		struct fuse_req *req;
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		struct fuse_req *forget_req;
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		struct dentry *parent;
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		/* For negative dentries, always do a fresh lookup */
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		if (!inode)
			return 0;

		fc = get_fuse_conn(inode);
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		req = fuse_get_req(fc);
		if (IS_ERR(req))
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			return 0;

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		forget_req = fuse_get_req(fc);
		if (IS_ERR(forget_req)) {
			fuse_put_request(fc, req);
			return 0;
		}

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		parent = dget_parent(entry);
		fuse_lookup_init(req, parent->d_inode, entry, &outarg);
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		request_send(fc, req);
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		dput(parent);
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		err = req->out.h.error;
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		fuse_put_request(fc, req);
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		/* Zero nodeid is same as -ENOENT */
		if (!err && !outarg.nodeid)
			err = -ENOENT;
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		if (!err) {
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			struct fuse_inode *fi = get_fuse_inode(inode);
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			if (outarg.nodeid != get_node_id(inode)) {
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				fuse_send_forget(fc, forget_req,
						 outarg.nodeid, 1);
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				return 0;
			}
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			spin_lock(&fc->lock);
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			fi->nlookup ++;
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			spin_unlock(&fc->lock);
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		}
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		fuse_put_request(fc, forget_req);
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		if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
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			return 0;

		fuse_change_attributes(inode, &outarg.attr);
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		fuse_change_timeout(entry, &outarg);
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	}
	return 1;
}

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static int invalid_nodeid(u64 nodeid)
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{
	return !nodeid || nodeid == FUSE_ROOT_ID;
}

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static struct dentry_operations fuse_dentry_operations = {
	.d_revalidate	= fuse_dentry_revalidate,
};

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int fuse_valid_type(int m)
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{
	return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
		S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
}

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/*
 * Add a directory inode to a dentry, ensuring that no other dentry
 * refers to this inode.  Called with fc->inst_mutex.
 */
static int fuse_d_add_directory(struct dentry *entry, struct inode *inode)
{
	struct dentry *alias = d_find_alias(inode);
	if (alias) {
		/* This tries to shrink the subtree below alias */
		fuse_invalidate_entry(alias);
		dput(alias);
		if (!list_empty(&inode->i_dentry))
			return -EBUSY;
	}
	d_add(entry, inode);
	return 0;
}

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static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
				  struct nameidata *nd)
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{
	int err;
	struct fuse_entry_out outarg;
	struct inode *inode = NULL;
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_req *req;
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	struct fuse_req *forget_req;
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	if (entry->d_name.len > FUSE_NAME_MAX)
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		return ERR_PTR(-ENAMETOOLONG);
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	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return ERR_PTR(PTR_ERR(req));
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	forget_req = fuse_get_req(fc);
	if (IS_ERR(forget_req)) {
		fuse_put_request(fc, req);
		return ERR_PTR(PTR_ERR(forget_req));
	}

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	fuse_lookup_init(req, dir, entry, &outarg);
	request_send(fc, req);
	err = req->out.h.error;
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	fuse_put_request(fc, req);
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	/* Zero nodeid is same as -ENOENT, but with valid timeout */
	if (!err && outarg.nodeid &&
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	    (invalid_nodeid(outarg.nodeid) ||
	     !fuse_valid_type(outarg.attr.mode)))
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		err = -EIO;
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	if (!err && outarg.nodeid) {
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		inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
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				  &outarg.attr);
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		if (!inode) {
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			fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
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			return ERR_PTR(-ENOMEM);
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		}
	}
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	fuse_put_request(fc, forget_req);
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	if (err && err != -ENOENT)
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		return ERR_PTR(err);
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	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);

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	entry->d_op = &fuse_dentry_operations;
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	if (!err)
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		fuse_change_timeout(entry, &outarg);
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	else
		fuse_invalidate_entry_cache(entry);
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	return NULL;
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}

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/*
 * Synchronous release for the case when something goes wrong in CREATE_OPEN
 */
static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff,
			      u64 nodeid, int flags)
{
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	fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE);
	ff->reserved_req->force = 1;
	request_send(fc, ff->reserved_req);
	fuse_put_request(fc, ff->reserved_req);
	kfree(ff);
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}

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/*
 * Atomic create+open operation
 *
 * If the filesystem doesn't support this, then fall back to separate
 * 'mknod' + 'open' requests.
 */
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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;
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	struct fuse_req *forget_req;
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	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)
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		return -ENOSYS;
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	forget_req = fuse_get_req(fc);
	if (IS_ERR(forget_req))
		return PTR_ERR(forget_req);

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	req = fuse_get_req(fc);
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	err = PTR_ERR(req);
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	if (IS_ERR(req))
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		goto out_put_forget_req;
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	err = -ENOMEM;
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	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;
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	if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
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		goto out_free_ff;

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	fuse_put_request(fc, req);
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	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;
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		fuse_sync_release(fc, ff, outentry.nodeid, flags);
		fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
		return -ENOMEM;
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	}
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	fuse_put_request(fc, forget_req);
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	d_instantiate(entry, inode);
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	fuse_change_timeout(entry, &outentry);
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	file = lookup_instantiate_filp(nd, entry, generic_file_open);
	if (IS_ERR(file)) {
		ff->fh = outopen.fh;
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		fuse_sync_release(fc, ff, outentry.nodeid, flags);
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		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);
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 out_put_forget_req:
	fuse_put_request(fc, forget_req);
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	return err;
}

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/*
 * Code shared between mknod, mkdir, symlink and link
 */
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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;
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	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);
	}
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	req->in.h.nodeid = get_node_id(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;
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	fuse_put_request(fc, req);
	if (err)
		goto out_put_forget_req;

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	err = -EIO;
	if (invalid_nodeid(outarg.nodeid))
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		goto out_put_forget_req;
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	if ((outarg.attr.mode ^ mode) & S_IFMT)
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		goto out_put_forget_req;
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	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
			  &outarg.attr);
	if (!inode) {
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		fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
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		return -ENOMEM;
	}
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	fuse_put_request(fc, forget_req);
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	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);
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	fuse_change_timeout(entry, &outarg);
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	fuse_invalidate_attr(dir);
	return 0;
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 out_put_forget_req:
	fuse_put_request(fc, forget_req);
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	return err;
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}

static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
		      dev_t rdev)
{
	struct fuse_mknod_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
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	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
	inarg.rdev = new_encode_dev(rdev);
	req->in.h.opcode = FUSE_MKNOD;
	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;
	return create_new_entry(fc, req, dir, entry, mode);
}

static int fuse_create(struct inode *dir, struct dentry *entry, int mode,
		       struct nameidata *nd)
{
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	if (nd && (nd->flags & LOOKUP_OPEN)) {
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		int err = fuse_create_open(dir, entry, mode, nd);
		if (err != -ENOSYS)
			return err;
		/* Fall back on mknod */
	}
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	return fuse_mknod(dir, entry, mode, 0);
}

static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode)
{
	struct fuse_mkdir_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
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	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
	req->in.h.opcode = FUSE_MKDIR;
	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;
	return create_new_entry(fc, req, dir, entry, S_IFDIR);
}

static int fuse_symlink(struct inode *dir, struct dentry *entry,
			const char *link)
{
	struct fuse_conn *fc = get_fuse_conn(dir);
	unsigned len = strlen(link) + 1;
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	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	req->in.h.opcode = FUSE_SYMLINK;
	req->in.numargs = 2;
	req->in.args[0].size = entry->d_name.len + 1;
	req->in.args[0].value = entry->d_name.name;
	req->in.args[1].size = len;
	req->in.args[1].value = link;
	return create_new_entry(fc, req, dir, entry, S_IFLNK);
}

static int fuse_unlink(struct inode *dir, struct dentry *entry)
{
	int err;
	struct fuse_conn *fc = get_fuse_conn(dir);
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	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	req->in.h.opcode = FUSE_UNLINK;
	req->in.h.nodeid = get_node_id(dir);
	req->in.numargs = 1;
	req->in.args[0].size = entry->d_name.len + 1;
	req->in.args[0].value = entry->d_name.name;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		struct inode *inode = entry->d_inode;

		/* Set nlink to zero so the inode can be cleared, if
                   the inode does have more links this will be
                   discovered at the next lookup/getattr */
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		clear_nlink(inode);
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		fuse_invalidate_attr(inode);
		fuse_invalidate_attr(dir);
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		fuse_invalidate_entry_cache(entry);
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	} else if (err == -EINTR)
		fuse_invalidate_entry(entry);
	return err;
}

static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
	int err;
	struct fuse_conn *fc = get_fuse_conn(dir);
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	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	req->in.h.opcode = FUSE_RMDIR;
	req->in.h.nodeid = get_node_id(dir);
	req->in.numargs = 1;
	req->in.args[0].size = entry->d_name.len + 1;
	req->in.args[0].value = entry->d_name.name;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
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		clear_nlink(entry->d_inode);
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		fuse_invalidate_attr(dir);
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		fuse_invalidate_entry_cache(entry);
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	} else if (err == -EINTR)
		fuse_invalidate_entry(entry);
	return err;
}

static int fuse_rename(struct inode *olddir, struct dentry *oldent,
		       struct inode *newdir, struct dentry *newent)
{
	int err;
	struct fuse_rename_in inarg;
	struct fuse_conn *fc = get_fuse_conn(olddir);
595 596 597
	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616

	memset(&inarg, 0, sizeof(inarg));
	inarg.newdir = get_node_id(newdir);
	req->in.h.opcode = FUSE_RENAME;
	req->in.h.nodeid = get_node_id(olddir);
	req->in.numargs = 3;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->in.args[1].size = oldent->d_name.len + 1;
	req->in.args[1].value = oldent->d_name.name;
	req->in.args[2].size = newent->d_name.len + 1;
	req->in.args[2].value = newent->d_name.name;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		fuse_invalidate_attr(olddir);
		if (olddir != newdir)
			fuse_invalidate_attr(newdir);
617 618 619 620

		/* newent will end up negative */
		if (newent->d_inode)
			fuse_invalidate_entry_cache(newent);
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
	} else if (err == -EINTR) {
		/* If request was interrupted, DEITY only knows if the
		   rename actually took place.  If the invalidation
		   fails (e.g. some process has CWD under the renamed
		   directory), then there can be inconsistency between
		   the dcache and the real filesystem.  Tough luck. */
		fuse_invalidate_entry(oldent);
		if (newent->d_inode)
			fuse_invalidate_entry(newent);
	}

	return err;
}

static int fuse_link(struct dentry *entry, struct inode *newdir,
		     struct dentry *newent)
{
	int err;
	struct fuse_link_in inarg;
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
642 643 644
	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665

	memset(&inarg, 0, sizeof(inarg));
	inarg.oldnodeid = get_node_id(inode);
	req->in.h.opcode = FUSE_LINK;
	req->in.numargs = 2;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->in.args[1].size = newent->d_name.len + 1;
	req->in.args[1].value = newent->d_name.name;
	err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
	/* Contrary to "normal" filesystems it can happen that link
	   makes two "logical" inodes point to the same "physical"
	   inode.  We invalidate the attributes of the old one, so it
	   will reflect changes in the backing inode (link count,
	   etc.)
	*/
	if (!err || err == -EINTR)
		fuse_invalidate_attr(inode);
	return err;
}

666
static int fuse_do_getattr(struct inode *inode)
667 668 669 670
{
	int err;
	struct fuse_attr_out arg;
	struct fuse_conn *fc = get_fuse_conn(inode);
671 672 673
	struct fuse_req *req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696

	req->in.h.opcode = FUSE_GETATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(arg);
	req->out.args[0].value = &arg;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) {
			make_bad_inode(inode);
			err = -EIO;
		} else {
			struct fuse_inode *fi = get_fuse_inode(inode);
			fuse_change_attributes(inode, &arg.attr);
			fi->i_time = time_to_jiffies(arg.attr_valid,
						     arg.attr_valid_nsec);
		}
	}
	return err;
}

697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
/*
 * 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;
}

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Miklos Szeredi 已提交
726 727 728 729 730 731 732 733 734 735
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;

736 737 738
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
M
Miklos Szeredi 已提交
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756

	memset(&inarg, 0, sizeof(inarg));
	inarg.mask = mask;
	req->in.h.opcode = FUSE_ACCESS;
	req->in.h.nodeid = get_node_id(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;
}

757 758 759 760 761 762 763 764 765 766 767 768 769
/*
 * Check permission.  The two basic access models of FUSE are:
 *
 * 1) Local access checking ('default_permissions' mount option) based
 * on file mode.  This is the plain old disk filesystem permission
 * modell.
 *
 * 2) "Remote" access checking, where server is responsible for
 * checking permission in each inode operation.  An exception to this
 * is if ->permission() was invoked from sys_access() in which case an
 * access request is sent.  Execute permission is still checked
 * locally based on file mode.
 */
770 771 772
static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
773 774 775
	struct fuse_inode *fi = get_fuse_inode(inode);
	bool refreshed = false;
	int err = 0;
776

777
	if (!fuse_allow_task(fc, current))
778
		return -EACCES;
779 780 781 782 783 784 785 786 787 788 789 790 791 792 793

	/*
	 * If attributes are needed, but are stale, refresh them
	 * before proceeding
	 */
	if (((fc->flags & FUSE_DEFAULT_PERMISSIONS) || (mask & MAY_EXEC)) &&
	    fi->i_time < get_jiffies_64()) {
		err = fuse_do_getattr(inode);
		if (err)
			return err;

		refreshed = true;
	}

	if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
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Miklos Szeredi 已提交
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		int err = generic_permission(inode, mask, NULL);

		/* If permission is denied, try to refresh file
		   attributes.  This is also needed, because the root
		   node will at first have no permissions */
799
		if (err == -EACCES && !refreshed) {
M
Miklos Szeredi 已提交
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		 	err = fuse_do_getattr(inode);
			if (!err)
				err = generic_permission(inode, mask, NULL);
		}

805 806 807 808
		/* Note: the opposite of the above test does not
		   exist.  So if permissions are revoked this won't be
		   noticed immediately, only after the attribute
		   timeout has expired */
M
Miklos Szeredi 已提交
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	} else {
811 812 813
		int mode = inode->i_mode;
		if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
			return -EACCES;
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Miklos Szeredi 已提交
814

815
		if (nd && (nd->flags & (LOOKUP_ACCESS | LOOKUP_CHDIR)))
M
Miklos Szeredi 已提交
816
			return fuse_access(inode, mask);
817
	}
818
	return err;
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
}

static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
			 void *dstbuf, filldir_t filldir)
{
	while (nbytes >= FUSE_NAME_OFFSET) {
		struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
		size_t reclen = FUSE_DIRENT_SIZE(dirent);
		int over;
		if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
			return -EIO;
		if (reclen > nbytes)
			break;

		over = filldir(dstbuf, dirent->name, dirent->namelen,
			       file->f_pos, dirent->ino, dirent->type);
		if (over)
			break;

		buf += reclen;
		nbytes -= reclen;
		file->f_pos = dirent->off;
	}

	return 0;
}

846
static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
847
{
848 849 850
	int err;
	size_t nbytes;
	struct page *page;
J
Josef Sipek 已提交
851
	struct inode *inode = file->f_path.dentry->d_inode;
852
	struct fuse_conn *fc = get_fuse_conn(inode);
853
	struct fuse_file *ff = file->private_data;
854 855 856 857 858
	struct fuse_req *req;

	if (is_bad_inode(inode))
		return -EIO;

859 860 861
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
862

863 864 865 866 867 868 869
	page = alloc_page(GFP_KERNEL);
	if (!page) {
		fuse_put_request(fc, req);
		return -ENOMEM;
	}
	req->num_pages = 1;
	req->pages[0] = page;
870
	fuse_read_fill(req, ff, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR);
871 872
	request_send(fc, req);
	nbytes = req->out.args[0].size;
873 874 875
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err)
876 877
		err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
				    filldir);
878

879
	__free_page(page);
880
	fuse_invalidate_attr(inode); /* atime changed */
881
	return err;
882 883 884 885 886 887
}

static char *read_link(struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
888
	struct fuse_req *req = fuse_get_req(fc);
889 890
	char *link;

891 892
	if (IS_ERR(req))
		return ERR_PTR(PTR_ERR(req));
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912

	link = (char *) __get_free_page(GFP_KERNEL);
	if (!link) {
		link = ERR_PTR(-ENOMEM);
		goto out;
	}
	req->in.h.opcode = FUSE_READLINK;
	req->in.h.nodeid = get_node_id(inode);
	req->out.argvar = 1;
	req->out.numargs = 1;
	req->out.args[0].size = PAGE_SIZE - 1;
	req->out.args[0].value = link;
	request_send(fc, req);
	if (req->out.h.error) {
		free_page((unsigned long) link);
		link = ERR_PTR(req->out.h.error);
	} else
		link[req->out.args[0].size] = '\0';
 out:
	fuse_put_request(fc, req);
913
	fuse_invalidate_attr(inode); /* atime changed */
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
	return link;
}

static void free_link(char *link)
{
	if (!IS_ERR(link))
		free_page((unsigned long) link);
}

static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	nd_set_link(nd, read_link(dentry));
	return NULL;
}

static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
{
	free_link(nd_get_link(nd));
}

static int fuse_dir_open(struct inode *inode, struct file *file)
{
936
	return fuse_open_common(inode, file, 1);
937 938 939 940
}

static int fuse_dir_release(struct inode *inode, struct file *file)
{
941
	return fuse_release_common(inode, file, 1);
942 943
}

944 945 946 947 948 949
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;
}

950
static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
951 952 953 954
{
	unsigned ivalid = iattr->ia_valid;

	if (ivalid & ATTR_MODE)
955
		arg->valid |= FATTR_MODE,   arg->mode = iattr->ia_mode;
956
	if (ivalid & ATTR_UID)
957
		arg->valid |= FATTR_UID,    arg->uid = iattr->ia_uid;
958
	if (ivalid & ATTR_GID)
959
		arg->valid |= FATTR_GID,    arg->gid = iattr->ia_gid;
960
	if (ivalid & ATTR_SIZE)
961
		arg->valid |= FATTR_SIZE,   arg->size = iattr->ia_size;
962 963
	/* You can only _set_ these together (they may change by themselves) */
	if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) {
964 965 966 967 968 969 970 971
		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;
972 973 974
	}
}

975 976 977 978 979
/*
 * Set attributes, and at the same time refresh them.
 *
 * Truncation is slightly complicated, because the 'truncate' request
 * may fail, in which case we don't want to touch the mapping.
M
Miklos Szeredi 已提交
980 981
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
982
 */
983 984 985 986 987 988 989 990 991 992
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	struct fuse_req *req;
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;
	int err;

M
Miklos Szeredi 已提交
993 994 995 996 997 998
	if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
		err = inode_change_ok(inode, attr);
		if (err)
			return err;
	}

999 1000
	if (attr->ia_valid & ATTR_SIZE) {
		unsigned long limit;
M
Miklos Szeredi 已提交
1001 1002
		if (IS_SWAPFILE(inode))
			return -ETXTBSY;
1003 1004 1005 1006 1007 1008 1009
		limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
		if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) {
			send_sig(SIGXFSZ, current, 0);
			return -EFBIG;
		}
	}

1010 1011 1012
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
1013 1014

	memset(&inarg, 0, sizeof(inarg));
1015
	iattr_to_fattr(attr, &inarg);
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
	req->in.h.opcode = FUSE_SETATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	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;
	fuse_put_request(fc, req);
1027 1028 1029 1030 1031
	if (err) {
		if (err == -EINTR)
			fuse_invalidate_attr(inode);
		return err;
	}
1032

1033 1034 1035 1036 1037 1038 1039 1040
	if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
		make_bad_inode(inode);
		return -EIO;
	}

	fuse_change_attributes(inode, &outarg.attr);
	fi->i_time = time_to_jiffies(outarg.attr_valid, outarg.attr_valid_nsec);
	return 0;
1041 1042
}

1043 1044 1045 1046
static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
			struct kstat *stat)
{
	struct inode *inode = entry->d_inode;
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
	struct fuse_inode *fi = get_fuse_inode(inode);
	struct fuse_conn *fc = get_fuse_conn(inode);
	int err = 0;

	if (!fuse_allow_task(fc, current))
		return -EACCES;

	if (fi->i_time < get_jiffies_64())
		err = fuse_do_getattr(inode);

1057
	if (!err) {
1058
		generic_fillattr(inode, stat);
1059 1060
		stat->mode = fi->orig_i_mode;
	}
1061 1062 1063 1064

	return err;
}

1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
static int fuse_setxattr(struct dentry *entry, const char *name,
			 const void *value, size_t size, int flags)
{
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_setxattr_in inarg;
	int err;

	if (fc->no_setxattr)
		return -EOPNOTSUPP;

1077 1078 1079
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	inarg.flags = flags;
	req->in.h.opcode = FUSE_SETXATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 3;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->in.args[1].size = strlen(name) + 1;
	req->in.args[1].value = name;
	req->in.args[2].size = size;
	req->in.args[2].value = value;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
		fc->no_setxattr = 1;
		err = -EOPNOTSUPP;
	}
	return err;
}

static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
			     void *value, size_t size)
{
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_getxattr_in inarg;
	struct fuse_getxattr_out outarg;
	ssize_t ret;

	if (fc->no_getxattr)
		return -EOPNOTSUPP;

1116 1117 1118
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	req->in.h.opcode = FUSE_GETXATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 2;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->in.args[1].size = strlen(name) + 1;
	req->in.args[1].value = name;
	/* This is really two different operations rolled into one */
	req->out.numargs = 1;
	if (size) {
		req->out.argvar = 1;
		req->out.args[0].size = size;
		req->out.args[0].value = value;
	} else {
		req->out.args[0].size = sizeof(outarg);
		req->out.args[0].value = &outarg;
	}
	request_send(fc, req);
	ret = req->out.h.error;
	if (!ret)
		ret = size ? req->out.args[0].size : outarg.size;
	else {
		if (ret == -ENOSYS) {
			fc->no_getxattr = 1;
			ret = -EOPNOTSUPP;
		}
	}
	fuse_put_request(fc, req);
	return ret;
}

static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
{
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_getxattr_in inarg;
	struct fuse_getxattr_out outarg;
	ssize_t ret;

	if (fc->no_listxattr)
		return -EOPNOTSUPP;

1165 1166 1167
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	req->in.h.opcode = FUSE_LISTXATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	/* This is really two different operations rolled into one */
	req->out.numargs = 1;
	if (size) {
		req->out.argvar = 1;
		req->out.args[0].size = size;
		req->out.args[0].value = list;
	} else {
		req->out.args[0].size = sizeof(outarg);
		req->out.args[0].value = &outarg;
	}
	request_send(fc, req);
	ret = req->out.h.error;
	if (!ret)
		ret = size ? req->out.args[0].size : outarg.size;
	else {
		if (ret == -ENOSYS) {
			fc->no_listxattr = 1;
			ret = -EOPNOTSUPP;
		}
	}
	fuse_put_request(fc, req);
	return ret;
}

static int fuse_removexattr(struct dentry *entry, const char *name)
{
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	int err;

	if (fc->no_removexattr)
		return -EOPNOTSUPP;

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	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	req->in.h.opcode = FUSE_REMOVEXATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = strlen(name) + 1;
	req->in.args[0].value = name;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
		fc->no_removexattr = 1;
		err = -EOPNOTSUPP;
	}
	return err;
}

1229
static const struct inode_operations fuse_dir_inode_operations = {
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	.lookup		= fuse_lookup,
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	.mkdir		= fuse_mkdir,
	.symlink	= fuse_symlink,
	.unlink		= fuse_unlink,
	.rmdir		= fuse_rmdir,
	.rename		= fuse_rename,
	.link		= fuse_link,
	.setattr	= fuse_setattr,
	.create		= fuse_create,
	.mknod		= fuse_mknod,
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	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
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	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
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};

1248
static const struct file_operations fuse_dir_operations = {
M
Miklos Szeredi 已提交
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	.llseek		= generic_file_llseek,
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	.read		= generic_read_dir,
	.readdir	= fuse_readdir,
	.open		= fuse_dir_open,
	.release	= fuse_dir_release,
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	.fsync		= fuse_dir_fsync,
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};

1257
static const struct inode_operations fuse_common_inode_operations = {
1258
	.setattr	= fuse_setattr,
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	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
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	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
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};

1267
static const struct inode_operations fuse_symlink_inode_operations = {
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	.setattr	= fuse_setattr,
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	.follow_link	= fuse_follow_link,
	.put_link	= fuse_put_link,
	.readlink	= generic_readlink,
	.getattr	= fuse_getattr,
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	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
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};

void fuse_init_common(struct inode *inode)
{
	inode->i_op = &fuse_common_inode_operations;
}

void fuse_init_dir(struct inode *inode)
{
	inode->i_op = &fuse_dir_inode_operations;
	inode->i_fop = &fuse_dir_operations;
}

void fuse_init_symlink(struct inode *inode)
{
	inode->i_op = &fuse_symlink_inode_operations;
}