dir.c 46.8 KB
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/*
  FUSE: Filesystem in Userspace
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  Copyright (C) 2001-2008  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/sched.h>
#include <linux/namei.h>
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#include <linux/slab.h>
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static bool fuse_use_readdirplus(struct inode *dir, struct file *filp)
{
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_inode *fi = get_fuse_inode(dir);

	if (!fc->do_readdirplus)
		return false;
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	if (!fc->readdirplus_auto)
		return true;
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	if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
		return true;
	if (filp->f_pos == 0)
		return true;
	return false;
}

static void fuse_advise_use_readdirplus(struct inode *dir)
{
	struct fuse_inode *fi = get_fuse_inode(dir);

	set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);
}

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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_entry_timeout(struct dentry *entry,
				      struct fuse_entry_out *o)
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{
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	fuse_dentry_settime(entry,
		time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
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}

static u64 attr_timeout(struct fuse_attr_out *o)
{
	return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
}

static u64 entry_attr_timeout(struct fuse_entry_out *o)
{
	return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
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}

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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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void fuse_invalidate_entry_cache(struct dentry *entry)
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{
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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_conn *fc, struct fuse_req *req,
			     u64 nodeid, struct qstr *name,
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			     struct fuse_entry_out *outarg)
{
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	memset(outarg, 0, sizeof(struct fuse_entry_out));
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	req->in.h.opcode = FUSE_LOOKUP;
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	req->in.h.nodeid = nodeid;
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	req->in.numargs = 1;
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	req->in.args[0].size = name->len + 1;
	req->in.args[0].value = name->name;
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	req->out.numargs = 1;
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	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(struct fuse_entry_out);
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	req->out.args[0].value = outarg;
}

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u64 fuse_get_attr_version(struct fuse_conn *fc)
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{
	u64 curr_version;

	/*
	 * The spin lock isn't actually needed on 64bit archs, but we
	 * don't yet care too much about such optimizations.
	 */
	spin_lock(&fc->lock);
	curr_version = fc->attr_version;
	spin_unlock(&fc->lock);

	return curr_version;
}

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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, unsigned int flags)
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{
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	struct inode *inode;
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	struct dentry *parent;
	struct fuse_conn *fc;
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	inode = ACCESS_ONCE(entry->d_inode);
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	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_req *req;
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		struct fuse_forget_link *forget;
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		u64 attr_version;
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196
		/* For negative dentries, always do a fresh lookup */
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		if (!inode)
			return 0;

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		if (flags & LOOKUP_RCU)
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			return -ECHILD;

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

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		forget = fuse_alloc_forget();
		if (!forget) {
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			fuse_put_request(fc, req);
			return 0;
		}

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		attr_version = fuse_get_attr_version(fc);
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		parent = dget_parent(entry);
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		fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
				 &entry->d_name, &outarg);
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		fuse_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_queue_forget(fc, forget, 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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		kfree(forget);
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		if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
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			return 0;

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		fuse_change_attributes(inode, &outarg.attr,
				       entry_attr_timeout(&outarg),
				       attr_version);
		fuse_change_entry_timeout(entry, &outarg);
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	} else if (inode) {
		fc = get_fuse_conn(inode);
		if (fc->readdirplus_auto) {
			parent = dget_parent(entry);
			fuse_advise_use_readdirplus(parent->d_inode);
			dput(parent);
		}
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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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const struct dentry_operations fuse_dentry_operations = {
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	.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.
 */
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static struct dentry *fuse_d_add_directory(struct dentry *entry,
					   struct inode *inode)
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{
	struct dentry *alias = d_find_alias(inode);
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	if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
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		/* This tries to shrink the subtree below alias */
		fuse_invalidate_entry(alias);
		dput(alias);
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		if (!hlist_empty(&inode->i_dentry))
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			return ERR_PTR(-EBUSY);
	} else {
		dput(alias);
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	}
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	return d_splice_alias(inode, entry);
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}

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int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
		     struct fuse_entry_out *outarg, struct inode **inode)
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{
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	struct fuse_conn *fc = get_fuse_conn_super(sb);
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	struct fuse_req *req;
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	struct fuse_forget_link *forget;
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	u64 attr_version;
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	int err;
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	*inode = NULL;
	err = -ENAMETOOLONG;
	if (name->len > FUSE_NAME_MAX)
		goto out;
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	req = fuse_get_req_nopages(fc);
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	err = PTR_ERR(req);
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	if (IS_ERR(req))
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		goto out;
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	forget = fuse_alloc_forget();
	err = -ENOMEM;
	if (!forget) {
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		fuse_put_request(fc, req);
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		goto out;
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	}

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	attr_version = fuse_get_attr_version(fc);
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	fuse_lookup_init(fc, req, nodeid, name, outarg);
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	fuse_request_send(fc, req);
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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, but with valid timeout */
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	if (err || !outarg->nodeid)
		goto out_put_forget;

	err = -EIO;
	if (!outarg->nodeid)
		goto out_put_forget;
	if (!fuse_valid_type(outarg->attr.mode))
		goto out_put_forget;

	*inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
			   &outarg->attr, entry_attr_timeout(outarg),
			   attr_version);
	err = -ENOMEM;
	if (!*inode) {
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		fuse_queue_forget(fc, forget, outarg->nodeid, 1);
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		goto out;
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	}
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	err = 0;

 out_put_forget:
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	kfree(forget);
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 out:
	return err;
}

static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
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				  unsigned int flags)
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{
	int err;
	struct fuse_entry_out outarg;
	struct inode *inode;
	struct dentry *newent;
	struct fuse_conn *fc = get_fuse_conn(dir);
	bool outarg_valid = true;

	err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
			       &outarg, &inode);
	if (err == -ENOENT) {
		outarg_valid = false;
		err = 0;
	}
	if (err)
		goto out_err;

	err = -EIO;
	if (inode && get_node_id(inode) == FUSE_ROOT_ID)
		goto out_iput;
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371 372
	if (inode && S_ISDIR(inode->i_mode)) {
		mutex_lock(&fc->inst_mutex);
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		newent = fuse_d_add_directory(entry, inode);
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		mutex_unlock(&fc->inst_mutex);
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		err = PTR_ERR(newent);
		if (IS_ERR(newent))
			goto out_iput;
	} else {
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		newent = d_splice_alias(inode, entry);
380
	}
381

382
	entry = newent ? newent : entry;
383
	if (outarg_valid)
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		fuse_change_entry_timeout(entry, &outarg);
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	else
		fuse_invalidate_entry_cache(entry);
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388
	fuse_advise_use_readdirplus(dir);
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	return newent;
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 out_iput:
	iput(inode);
 out_err:
	return ERR_PTR(err);
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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,
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			    struct file *file, unsigned flags,
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			    umode_t mode, int *opened)
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{
	int err;
	struct inode *inode;
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_req *req;
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	struct fuse_forget_link *forget;
412
	struct fuse_create_in inarg;
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	struct fuse_open_out outopen;
	struct fuse_entry_out outentry;
	struct fuse_file *ff;

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	/* Userspace expects S_IFREG in create mode */
	BUG_ON((mode & S_IFMT) != S_IFREG);

420
	forget = fuse_alloc_forget();
421
	err = -ENOMEM;
422
	if (!forget)
423
		goto out_err;
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	req = fuse_get_req_nopages(fc);
426
	err = PTR_ERR(req);
427
	if (IS_ERR(req))
428
		goto out_put_forget_req;
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430
	err = -ENOMEM;
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	ff = fuse_file_alloc(fc);
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	if (!ff)
		goto out_put_request;

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	if (!fc->dont_mask)
		mode &= ~current_umask();

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	flags &= ~O_NOCTTY;
	memset(&inarg, 0, sizeof(inarg));
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	memset(&outentry, 0, sizeof(outentry));
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	inarg.flags = flags;
	inarg.mode = mode;
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	inarg.umask = current_umask();
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	req->in.h.opcode = FUSE_CREATE;
	req->in.h.nodeid = get_node_id(dir);
	req->in.numargs = 2;
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	req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
						sizeof(inarg);
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	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;
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	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(outentry);
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	req->out.args[0].value = &outentry;
	req->out.args[1].size = sizeof(outopen);
	req->out.args[1].value = &outopen;
460
	fuse_request_send(fc, req);
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	err = req->out.h.error;
462
	if (err)
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		goto out_free_ff;

	err = -EIO;
466
	if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
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		goto out_free_ff;

469
	fuse_put_request(fc, req);
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	ff->fh = outopen.fh;
	ff->nodeid = outentry.nodeid;
	ff->open_flags = outopen.open_flags;
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	inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
474
			  &outentry.attr, entry_attr_timeout(&outentry), 0);
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	if (!inode) {
		flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
477
		fuse_sync_release(ff, flags);
478
		fuse_queue_forget(fc, forget, outentry.nodeid, 1);
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		err = -ENOMEM;
		goto out_err;
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	}
482
	kfree(forget);
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	d_instantiate(entry, inode);
484
	fuse_change_entry_timeout(entry, &outentry);
485
	fuse_invalidate_attr(dir);
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	err = finish_open(file, entry, generic_file_open, opened);
	if (err) {
488
		fuse_sync_release(ff, flags);
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	} else {
		file->private_data = fuse_file_get(ff);
		fuse_finish_open(inode, file);
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	}
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	return err;
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495
out_free_ff:
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	fuse_file_free(ff);
497
out_put_request:
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	fuse_put_request(fc, req);
499
out_put_forget_req:
500
	kfree(forget);
501
out_err:
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	return err;
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}

static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
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static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
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			    struct file *file, unsigned flags,
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			    umode_t mode, int *opened)
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{
	int err;
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct dentry *res = NULL;

	if (d_unhashed(entry)) {
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		res = fuse_lookup(dir, entry, 0);
516
		if (IS_ERR(res))
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			return PTR_ERR(res);
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		if (res)
			entry = res;
	}

	if (!(flags & O_CREAT) || entry->d_inode)
		goto no_open;

	/* Only creates */
527
	*opened |= FILE_CREATED;
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	if (fc->no_create)
		goto mknod;

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	err = fuse_create_open(dir, entry, file, flags, mode, opened);
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	if (err == -ENOSYS) {
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		fc->no_create = 1;
		goto mknod;
	}
out_dput:
	dput(res);
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	return err;
540 541 542

mknod:
	err = fuse_mknod(dir, entry, mode, 0);
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	if (err)
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		goto out_dput;
no_open:
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	return finish_no_open(file, res);
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}

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/*
 * Code shared between mknod, mkdir, symlink and link
 */
552 553
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
			    struct inode *dir, struct dentry *entry,
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			    umode_t mode)
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{
	struct fuse_entry_out outarg;
	struct inode *inode;
	int err;
559
	struct fuse_forget_link *forget;
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561 562
	forget = fuse_alloc_forget();
	if (!forget) {
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		fuse_put_request(fc, req);
564
		return -ENOMEM;
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	}
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567
	memset(&outarg, 0, sizeof(outarg));
568 569
	req->in.h.nodeid = get_node_id(dir);
	req->out.numargs = 1;
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	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(outarg);
574
	req->out.args[0].value = &outarg;
575
	fuse_request_send(fc, req);
576
	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;
584 585

	if ((outarg.attr.mode ^ mode) & S_IFMT)
M
Miklos Szeredi 已提交
586
		goto out_put_forget_req;
587

588
	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
589
			  &outarg.attr, entry_attr_timeout(&outarg), 0);
590
	if (!inode) {
591
		fuse_queue_forget(fc, forget, outarg.nodeid, 1);
592 593
		return -ENOMEM;
	}
594
	kfree(forget);
595

596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
	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);
611

612
	fuse_change_entry_timeout(entry, &outarg);
613 614
	fuse_invalidate_attr(dir);
	return 0;
615

M
Miklos Szeredi 已提交
616
 out_put_forget_req:
617
	kfree(forget);
618
	return err;
619 620
}

A
Al Viro 已提交
621
static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
622 623 624 625
		      dev_t rdev)
{
	struct fuse_mknod_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
M
Maxim Patlasov 已提交
626
	struct fuse_req *req = fuse_get_req_nopages(fc);
627 628
	if (IS_ERR(req))
		return PTR_ERR(req);
629

630 631 632
	if (!fc->dont_mask)
		mode &= ~current_umask();

633 634 635
	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
	inarg.rdev = new_encode_dev(rdev);
636
	inarg.umask = current_umask();
637 638
	req->in.h.opcode = FUSE_MKNOD;
	req->in.numargs = 2;
639 640
	req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
						sizeof(inarg);
641 642 643 644 645 646
	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);
}

A
Al Viro 已提交
647
static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
A
Al Viro 已提交
648
		       bool excl)
649 650 651 652
{
	return fuse_mknod(dir, entry, mode, 0);
}

653
static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
654 655 656
{
	struct fuse_mkdir_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
M
Maxim Patlasov 已提交
657
	struct fuse_req *req = fuse_get_req_nopages(fc);
658 659
	if (IS_ERR(req))
		return PTR_ERR(req);
660

661 662 663
	if (!fc->dont_mask)
		mode &= ~current_umask();

664 665
	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
666
	inarg.umask = current_umask();
667 668 669 670 671 672 673 674 675 676 677 678 679 680
	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;
M
Maxim Patlasov 已提交
681
	struct fuse_req *req = fuse_get_req_nopages(fc);
682 683
	if (IS_ERR(req))
		return PTR_ERR(req);
684 685 686 687 688 689 690 691 692 693 694 695 696 697

	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);
M
Maxim Patlasov 已提交
698
	struct fuse_req *req = fuse_get_req_nopages(fc);
699 700
	if (IS_ERR(req))
		return PTR_ERR(req);
701 702 703 704 705 706

	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;
707
	fuse_request_send(fc, req);
708 709 710 711
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		struct inode *inode = entry->d_inode;
M
Miklos Szeredi 已提交
712
		struct fuse_inode *fi = get_fuse_inode(inode);
713

M
Miklos Szeredi 已提交
714 715
		spin_lock(&fc->lock);
		fi->attr_version = ++fc->attr_version;
716 717 718 719 720 721 722 723
		/*
		 * If i_nlink == 0 then unlink doesn't make sense, yet this can
		 * happen if userspace filesystem is careless.  It would be
		 * difficult to enforce correct nlink usage so just ignore this
		 * condition here
		 */
		if (inode->i_nlink > 0)
			drop_nlink(inode);
M
Miklos Szeredi 已提交
724
		spin_unlock(&fc->lock);
725 726
		fuse_invalidate_attr(inode);
		fuse_invalidate_attr(dir);
727
		fuse_invalidate_entry_cache(entry);
728 729 730 731 732 733 734 735 736
	} 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);
M
Maxim Patlasov 已提交
737
	struct fuse_req *req = fuse_get_req_nopages(fc);
738 739
	if (IS_ERR(req))
		return PTR_ERR(req);
740 741 742 743 744 745

	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;
746
	fuse_request_send(fc, req);
747 748 749
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
750
		clear_nlink(entry->d_inode);
751
		fuse_invalidate_attr(dir);
752
		fuse_invalidate_entry_cache(entry);
753 754 755 756 757 758 759 760 761 762 763
	} 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);
M
Maxim Patlasov 已提交
764
	struct fuse_req *req = fuse_get_req_nopages(fc);
765

766 767
	if (IS_ERR(req))
		return PTR_ERR(req);
768 769 770 771 772 773 774 775 776 777 778 779

	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;
780
	fuse_request_send(fc, req);
781 782 783
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
784 785 786
		/* ctime changes */
		fuse_invalidate_attr(oldent->d_inode);

787 788 789
		fuse_invalidate_attr(olddir);
		if (olddir != newdir)
			fuse_invalidate_attr(newdir);
790 791

		/* newent will end up negative */
M
Miklos Szeredi 已提交
792 793
		if (newent->d_inode) {
			fuse_invalidate_attr(newent->d_inode);
794
			fuse_invalidate_entry_cache(newent);
M
Miklos Szeredi 已提交
795
		}
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
	} 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);
M
Maxim Patlasov 已提交
817
	struct fuse_req *req = fuse_get_req_nopages(fc);
818 819
	if (IS_ERR(req))
		return PTR_ERR(req);
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835

	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.)
	*/
M
Miklos Szeredi 已提交
836 837 838 839 840 841 842
	if (!err) {
		struct fuse_inode *fi = get_fuse_inode(inode);

		spin_lock(&fc->lock);
		fi->attr_version = ++fc->attr_version;
		inc_nlink(inode);
		spin_unlock(&fc->lock);
843
		fuse_invalidate_attr(inode);
M
Miklos Szeredi 已提交
844 845 846
	} else if (err == -EINTR) {
		fuse_invalidate_attr(inode);
	}
847 848 849
	return err;
}

850 851 852
static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
			  struct kstat *stat)
{
M
Miklos Szeredi 已提交
853 854
	unsigned int blkbits;

855 856 857 858
	stat->dev = inode->i_sb->s_dev;
	stat->ino = attr->ino;
	stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
	stat->nlink = attr->nlink;
859 860
	stat->uid = make_kuid(&init_user_ns, attr->uid);
	stat->gid = make_kgid(&init_user_ns, attr->gid);
861 862 863 864 865 866 867 868 869
	stat->rdev = inode->i_rdev;
	stat->atime.tv_sec = attr->atime;
	stat->atime.tv_nsec = attr->atimensec;
	stat->mtime.tv_sec = attr->mtime;
	stat->mtime.tv_nsec = attr->mtimensec;
	stat->ctime.tv_sec = attr->ctime;
	stat->ctime.tv_nsec = attr->ctimensec;
	stat->size = attr->size;
	stat->blocks = attr->blocks;
M
Miklos Szeredi 已提交
870 871 872 873 874 875 876

	if (attr->blksize != 0)
		blkbits = ilog2(attr->blksize);
	else
		blkbits = inode->i_sb->s_blocksize_bits;

	stat->blksize = 1 << blkbits;
877 878
}

879 880
static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
			   struct file *file)
881 882
{
	int err;
883 884
	struct fuse_getattr_in inarg;
	struct fuse_attr_out outarg;
885
	struct fuse_conn *fc = get_fuse_conn(inode);
886 887 888
	struct fuse_req *req;
	u64 attr_version;

M
Maxim Patlasov 已提交
889
	req = fuse_get_req_nopages(fc);
890 891
	if (IS_ERR(req))
		return PTR_ERR(req);
892

893
	attr_version = fuse_get_attr_version(fc);
894

895
	memset(&inarg, 0, sizeof(inarg));
896
	memset(&outarg, 0, sizeof(outarg));
897 898 899 900 901 902 903
	/* Directories have separate file-handle space */
	if (file && S_ISREG(inode->i_mode)) {
		struct fuse_file *ff = file->private_data;

		inarg.getattr_flags |= FUSE_GETATTR_FH;
		inarg.fh = ff->fh;
	}
904 905
	req->in.h.opcode = FUSE_GETATTR;
	req->in.h.nodeid = get_node_id(inode);
906 907 908
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
909
	req->out.numargs = 1;
910 911 912 913
	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(outarg);
914
	req->out.args[0].value = &outarg;
915
	fuse_request_send(fc, req);
916 917 918
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
919
		if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
920 921 922
			make_bad_inode(inode);
			err = -EIO;
		} else {
923 924
			fuse_change_attributes(inode, &outarg.attr,
					       attr_timeout(&outarg),
925 926
					       attr_version);
			if (stat)
927
				fuse_fillattr(inode, &outarg.attr, stat);
928 929 930 931 932
		}
	}
	return err;
}

M
Miklos Szeredi 已提交
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948
int fuse_update_attributes(struct inode *inode, struct kstat *stat,
			   struct file *file, bool *refreshed)
{
	struct fuse_inode *fi = get_fuse_inode(inode);
	int err;
	bool r;

	if (fi->i_time < get_jiffies_64()) {
		r = true;
		err = fuse_do_getattr(inode, stat, file);
	} else {
		r = false;
		err = 0;
		if (stat) {
			generic_fillattr(inode, stat);
			stat->mode = fi->orig_i_mode;
949
			stat->ino = fi->orig_ino;
M
Miklos Szeredi 已提交
950 951 952 953 954 955 956 957 958
		}
	}

	if (refreshed != NULL)
		*refreshed = r;

	return err;
}

J
John Muir 已提交
959
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
960
			     u64 child_nodeid, struct qstr *name)
J
John Muir 已提交
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
{
	int err = -ENOTDIR;
	struct inode *parent;
	struct dentry *dir;
	struct dentry *entry;

	parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
	if (!parent)
		return -ENOENT;

	mutex_lock(&parent->i_mutex);
	if (!S_ISDIR(parent->i_mode))
		goto unlock;

	err = -ENOENT;
	dir = d_find_alias(parent);
	if (!dir)
		goto unlock;

	entry = d_lookup(dir, name);
	dput(dir);
	if (!entry)
		goto unlock;

	fuse_invalidate_attr(parent);
	fuse_invalidate_entry(entry);
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015

	if (child_nodeid != 0 && entry->d_inode) {
		mutex_lock(&entry->d_inode->i_mutex);
		if (get_node_id(entry->d_inode) != child_nodeid) {
			err = -ENOENT;
			goto badentry;
		}
		if (d_mountpoint(entry)) {
			err = -EBUSY;
			goto badentry;
		}
		if (S_ISDIR(entry->d_inode->i_mode)) {
			shrink_dcache_parent(entry);
			if (!simple_empty(entry)) {
				err = -ENOTEMPTY;
				goto badentry;
			}
			entry->d_inode->i_flags |= S_DEAD;
		}
		dont_mount(entry);
		clear_nlink(entry->d_inode);
		err = 0;
 badentry:
		mutex_unlock(&entry->d_inode->i_mutex);
		if (!err)
			d_delete(entry);
	} else {
		err = 0;
	}
J
John Muir 已提交
1016 1017 1018 1019 1020 1021 1022 1023
	dput(entry);

 unlock:
	mutex_unlock(&parent->i_mutex);
	iput(parent);
	return err;
}

1024 1025
/*
 * Calling into a user-controlled filesystem gives the filesystem
1026
 * daemon ptrace-like capabilities over the current process.  This
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
 * 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.
 */
1037
int fuse_allow_current_process(struct fuse_conn *fc)
1038
{
1039
	const struct cred *cred;
1040

1041
	if (fc->flags & FUSE_ALLOW_OTHER)
1042 1043
		return 1;

1044
	cred = current_cred();
1045 1046 1047 1048 1049 1050
	if (uid_eq(cred->euid, fc->user_id) &&
	    uid_eq(cred->suid, fc->user_id) &&
	    uid_eq(cred->uid,  fc->user_id) &&
	    gid_eq(cred->egid, fc->group_id) &&
	    gid_eq(cred->sgid, fc->group_id) &&
	    gid_eq(cred->gid,  fc->group_id))
1051
		return 1;
1052

1053
	return 0;
1054 1055
}

M
Miklos Szeredi 已提交
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
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;

M
Maxim Patlasov 已提交
1066
	req = fuse_get_req_nopages(fc);
1067 1068
	if (IS_ERR(req))
		return PTR_ERR(req);
M
Miklos Szeredi 已提交
1069 1070

	memset(&inarg, 0, sizeof(inarg));
1071
	inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
M
Miklos Szeredi 已提交
1072 1073 1074 1075 1076
	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;
1077
	fuse_request_send(fc, req);
M
Miklos Szeredi 已提交
1078 1079 1080 1081 1082 1083 1084 1085 1086
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
		fc->no_access = 1;
		err = 0;
	}
	return err;
}

1087
static int fuse_perm_getattr(struct inode *inode, int mask)
1088
{
1089
	if (mask & MAY_NOT_BLOCK)
1090 1091 1092 1093 1094
		return -ECHILD;

	return fuse_do_getattr(inode, NULL, NULL);
}

1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
/*
 * 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.
 */
1108
static int fuse_permission(struct inode *inode, int mask)
1109 1110
{
	struct fuse_conn *fc = get_fuse_conn(inode);
1111 1112
	bool refreshed = false;
	int err = 0;
1113

1114
	if (!fuse_allow_current_process(fc))
1115
		return -EACCES;
1116 1117

	/*
1118
	 * If attributes are needed, refresh them before proceeding
1119
	 */
1120 1121
	if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
	    ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
1122 1123 1124 1125 1126
		struct fuse_inode *fi = get_fuse_inode(inode);

		if (fi->i_time < get_jiffies_64()) {
			refreshed = true;

1127
			err = fuse_perm_getattr(inode, mask);
1128 1129 1130
			if (err)
				return err;
		}
1131 1132 1133
	}

	if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
1134
		err = generic_permission(inode, mask);
M
Miklos Szeredi 已提交
1135 1136 1137 1138

		/* If permission is denied, try to refresh file
		   attributes.  This is also needed, because the root
		   node will at first have no permissions */
1139
		if (err == -EACCES && !refreshed) {
1140
			err = fuse_perm_getattr(inode, mask);
M
Miklos Szeredi 已提交
1141
			if (!err)
1142
				err = generic_permission(inode, mask);
M
Miklos Szeredi 已提交
1143 1144
		}

1145 1146 1147 1148
		/* 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 */
E
Eric Paris 已提交
1149
	} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1150
		if (mask & MAY_NOT_BLOCK)
1151 1152
			return -ECHILD;

1153 1154 1155 1156 1157 1158
		err = fuse_access(inode, mask);
	} else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
		if (!(inode->i_mode & S_IXUGO)) {
			if (refreshed)
				return -EACCES;

1159
			err = fuse_perm_getattr(inode, mask);
1160 1161 1162
			if (!err && !(inode->i_mode & S_IXUGO))
				return -EACCES;
		}
1163
	}
1164
	return err;
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
}

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;
}

1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
static int fuse_direntplus_link(struct file *file,
				struct fuse_direntplus *direntplus,
				u64 attr_version)
{
	int err;
	struct fuse_entry_out *o = &direntplus->entry_out;
	struct fuse_dirent *dirent = &direntplus->dirent;
	struct dentry *parent = file->f_path.dentry;
	struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
	struct dentry *dentry;
	struct dentry *alias;
	struct inode *dir = parent->d_inode;
	struct fuse_conn *fc;
	struct inode *inode;

	if (!o->nodeid) {
		/*
		 * Unlike in the case of fuse_lookup, zero nodeid does not mean
		 * ENOENT. Instead, it only means the userspace filesystem did
		 * not want to return attributes/handle for this entry.
		 *
		 * So do nothing.
		 */
		return 0;
	}

	if (name.name[0] == '.') {
		/*
		 * We could potentially refresh the attributes of the directory
		 * and its parent?
		 */
		if (name.len == 1)
			return 0;
		if (name.name[1] == '.' && name.len == 2)
			return 0;
	}
	fc = get_fuse_conn(dir);

	name.hash = full_name_hash(name.name, name.len);
	dentry = d_lookup(parent, &name);
	if (dentry && dentry->d_inode) {
		inode = dentry->d_inode;
		if (get_node_id(inode) == o->nodeid) {
			struct fuse_inode *fi;
			fi = get_fuse_inode(inode);
			spin_lock(&fc->lock);
			fi->nlookup++;
			spin_unlock(&fc->lock);

			/*
			 * The other branch to 'found' comes via fuse_iget()
			 * which bumps nlookup inside
			 */
			goto found;
		}
		err = d_invalidate(dentry);
		if (err)
			goto out;
		dput(dentry);
		dentry = NULL;
	}

	dentry = d_alloc(parent, &name);
	err = -ENOMEM;
	if (!dentry)
		goto out;

	inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
			  &o->attr, entry_attr_timeout(o), attr_version);
	if (!inode)
		goto out;

	alias = d_materialise_unique(dentry, inode);
	err = PTR_ERR(alias);
	if (IS_ERR(alias))
		goto out;
	if (alias) {
		dput(dentry);
		dentry = alias;
	}

found:
	fuse_change_attributes(inode, &o->attr, entry_attr_timeout(o),
			       attr_version);

	fuse_change_entry_timeout(dentry, o);

	err = 0;
out:
	if (dentry)
		dput(dentry);
	return err;
}

static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
			     void *dstbuf, filldir_t filldir, u64 attr_version)
{
	struct fuse_direntplus *direntplus;
	struct fuse_dirent *dirent;
	size_t reclen;
	int over = 0;
	int ret;

	while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
		direntplus = (struct fuse_direntplus *) buf;
		dirent = &direntplus->dirent;
		reclen = FUSE_DIRENTPLUS_SIZE(direntplus);

		if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
			return -EIO;
		if (reclen > nbytes)
			break;

		if (!over) {
			/* We fill entries into dstbuf only as much as
			   it can hold. But we still continue iterating
			   over remaining entries to link them. If not,
			   we need to send a FORGET for each of those
			   which we did not link.
			*/
			over = filldir(dstbuf, dirent->name, dirent->namelen,
				       file->f_pos, dirent->ino,
				       dirent->type);
			file->f_pos = dirent->off;
		}

		buf += reclen;
		nbytes -= reclen;

		ret = fuse_direntplus_link(file, direntplus, attr_version);
		if (ret)
			fuse_force_forget(file, direntplus->entry_out.nodeid);
	}

	return 0;
}

1329
static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1330
{
1331
	int plus, err;
1332 1333
	size_t nbytes;
	struct page *page;
A
Al Viro 已提交
1334
	struct inode *inode = file_inode(file);
1335
	struct fuse_conn *fc = get_fuse_conn(inode);
1336
	struct fuse_req *req;
1337
	u64 attr_version = 0;
1338 1339 1340 1341

	if (is_bad_inode(inode))
		return -EIO;

M
Maxim Patlasov 已提交
1342
	req = fuse_get_req(fc, 1);
1343 1344
	if (IS_ERR(req))
		return PTR_ERR(req);
1345

1346 1347 1348 1349 1350
	page = alloc_page(GFP_KERNEL);
	if (!page) {
		fuse_put_request(fc, req);
		return -ENOMEM;
	}
1351 1352

	plus = fuse_use_readdirplus(inode, file);
1353
	req->out.argpages = 1;
1354 1355
	req->num_pages = 1;
	req->pages[0] = page;
1356
	req->page_descs[0].length = PAGE_SIZE;
1357
	if (plus) {
1358 1359 1360 1361 1362 1363 1364
		attr_version = fuse_get_attr_version(fc);
		fuse_read_fill(req, file, file->f_pos, PAGE_SIZE,
			       FUSE_READDIRPLUS);
	} else {
		fuse_read_fill(req, file, file->f_pos, PAGE_SIZE,
			       FUSE_READDIR);
	}
1365
	fuse_request_send(fc, req);
1366
	nbytes = req->out.args[0].size;
1367 1368
	err = req->out.h.error;
	fuse_put_request(fc, req);
1369
	if (!err) {
1370
		if (plus) {
1371 1372 1373 1374 1375 1376 1377 1378
			err = parse_dirplusfile(page_address(page), nbytes,
						file, dstbuf, filldir,
						attr_version);
		} else {
			err = parse_dirfile(page_address(page), nbytes, file,
					    dstbuf, filldir);
		}
	}
1379

1380
	__free_page(page);
1381
	fuse_invalidate_attr(inode); /* atime changed */
1382
	return err;
1383 1384 1385 1386 1387 1388
}

static char *read_link(struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
M
Maxim Patlasov 已提交
1389
	struct fuse_req *req = fuse_get_req_nopages(fc);
1390 1391
	char *link;

1392
	if (IS_ERR(req))
1393
		return ERR_CAST(req);
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405

	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;
1406
	fuse_request_send(fc, req);
1407 1408 1409 1410 1411 1412 1413
	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);
1414
	fuse_invalidate_attr(inode); /* atime changed */
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
	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)
{
1437
	return fuse_open_common(inode, file, true);
1438 1439 1440 1441
}

static int fuse_dir_release(struct inode *inode, struct file *file)
{
1442 1443 1444
	fuse_release_common(file, FUSE_RELEASEDIR);

	return 0;
1445 1446
}

1447 1448
static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
			  int datasync)
1449
{
1450
	return fuse_fsync_common(file, start, end, datasync, 1);
1451 1452
}

1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
			    unsigned long arg)
{
	struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);

	/* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
	if (fc->minor < 18)
		return -ENOTTY;

	return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
}

static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
				   unsigned long arg)
{
	struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);

	if (fc->minor < 18)
		return -ENOTTY;

	return fuse_ioctl_common(file, cmd, arg,
				 FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
}

M
Miklos Szeredi 已提交
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
static bool update_mtime(unsigned ivalid)
{
	/* Always update if mtime is explicitly set  */
	if (ivalid & ATTR_MTIME_SET)
		return true;

	/* If it's an open(O_TRUNC) or an ftruncate(), don't update */
	if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
		return false;

	/* In all other cases update */
	return true;
}

1491
static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
1492 1493 1494 1495
{
	unsigned ivalid = iattr->ia_valid;

	if (ivalid & ATTR_MODE)
1496
		arg->valid |= FATTR_MODE,   arg->mode = iattr->ia_mode;
1497
	if (ivalid & ATTR_UID)
1498
		arg->valid |= FATTR_UID,    arg->uid = from_kuid(&init_user_ns, iattr->ia_uid);
1499
	if (ivalid & ATTR_GID)
1500
		arg->valid |= FATTR_GID,    arg->gid = from_kgid(&init_user_ns, iattr->ia_gid);
1501
	if (ivalid & ATTR_SIZE)
1502
		arg->valid |= FATTR_SIZE,   arg->size = iattr->ia_size;
M
Miklos Szeredi 已提交
1503 1504
	if (ivalid & ATTR_ATIME) {
		arg->valid |= FATTR_ATIME;
1505
		arg->atime = iattr->ia_atime.tv_sec;
M
Miklos Szeredi 已提交
1506 1507 1508 1509 1510 1511
		arg->atimensec = iattr->ia_atime.tv_nsec;
		if (!(ivalid & ATTR_ATIME_SET))
			arg->valid |= FATTR_ATIME_NOW;
	}
	if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
		arg->valid |= FATTR_MTIME;
1512
		arg->mtime = iattr->ia_mtime.tv_sec;
M
Miklos Szeredi 已提交
1513 1514 1515
		arg->mtimensec = iattr->ia_mtime.tv_nsec;
		if (!(ivalid & ATTR_MTIME_SET))
			arg->valid |= FATTR_MTIME_NOW;
1516
	}
1517 1518
}

M
Miklos Szeredi 已提交
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
/*
 * Prevent concurrent writepages on inode
 *
 * This is done by adding a negative bias to the inode write counter
 * and waiting for all pending writes to finish.
 */
void fuse_set_nowrite(struct inode *inode)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);

	BUG_ON(!mutex_is_locked(&inode->i_mutex));

	spin_lock(&fc->lock);
	BUG_ON(fi->writectr < 0);
	fi->writectr += FUSE_NOWRITE;
	spin_unlock(&fc->lock);
	wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
}

/*
 * Allow writepages on inode
 *
 * Remove the bias from the writecounter and send any queued
 * writepages.
 */
static void __fuse_release_nowrite(struct inode *inode)
{
	struct fuse_inode *fi = get_fuse_inode(inode);

	BUG_ON(fi->writectr != FUSE_NOWRITE);
	fi->writectr = 0;
	fuse_flush_writepages(inode);
}

void fuse_release_nowrite(struct inode *inode)
{
	struct fuse_conn *fc = get_fuse_conn(inode);

	spin_lock(&fc->lock);
	__fuse_release_nowrite(inode);
	spin_unlock(&fc->lock);
}

1563 1564 1565 1566 1567
/*
 * 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
1568 1569
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
1570
 */
1571 1572
int fuse_do_setattr(struct inode *inode, struct iattr *attr,
		    struct file *file)
1573 1574 1575 1576 1577
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;
M
Miklos Szeredi 已提交
1578 1579
	bool is_truncate = false;
	loff_t oldsize;
1580 1581
	int err;

1582 1583 1584 1585 1586 1587
	if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
		attr->ia_valid |= ATTR_FORCE;

	err = inode_change_ok(inode, attr);
	if (err)
		return err;
M
Miklos Szeredi 已提交
1588

M
Miklos Szeredi 已提交
1589 1590 1591 1592 1593
	if (attr->ia_valid & ATTR_OPEN) {
		if (fc->atomic_o_trunc)
			return 0;
		file = NULL;
	}
1594

1595
	if (attr->ia_valid & ATTR_SIZE)
M
Miklos Szeredi 已提交
1596
		is_truncate = true;
1597

M
Maxim Patlasov 已提交
1598
	req = fuse_get_req_nopages(fc);
1599 1600
	if (IS_ERR(req))
		return PTR_ERR(req);
1601

M
Miklos Szeredi 已提交
1602 1603 1604
	if (is_truncate)
		fuse_set_nowrite(inode);

1605
	memset(&inarg, 0, sizeof(inarg));
1606
	memset(&outarg, 0, sizeof(outarg));
1607
	iattr_to_fattr(attr, &inarg);
1608 1609 1610 1611 1612
	if (file) {
		struct fuse_file *ff = file->private_data;
		inarg.valid |= FATTR_FH;
		inarg.fh = ff->fh;
	}
1613 1614 1615 1616 1617
	if (attr->ia_valid & ATTR_SIZE) {
		/* For mandatory locking in truncate */
		inarg.valid |= FATTR_LOCKOWNER;
		inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
	}
1618 1619 1620 1621 1622 1623
	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;
1624 1625 1626 1627
	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(outarg);
1628
	req->out.args[0].value = &outarg;
1629
	fuse_request_send(fc, req);
1630 1631
	err = req->out.h.error;
	fuse_put_request(fc, req);
1632 1633 1634
	if (err) {
		if (err == -EINTR)
			fuse_invalidate_attr(inode);
M
Miklos Szeredi 已提交
1635
		goto error;
1636
	}
1637

1638 1639
	if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
		make_bad_inode(inode);
M
Miklos Szeredi 已提交
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660
		err = -EIO;
		goto error;
	}

	spin_lock(&fc->lock);
	fuse_change_attributes_common(inode, &outarg.attr,
				      attr_timeout(&outarg));
	oldsize = inode->i_size;
	i_size_write(inode, outarg.attr.size);

	if (is_truncate) {
		/* NOTE: this may release/reacquire fc->lock */
		__fuse_release_nowrite(inode);
	}
	spin_unlock(&fc->lock);

	/*
	 * Only call invalidate_inode_pages2() after removing
	 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
	 */
	if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
N
npiggin@suse.de 已提交
1661
		truncate_pagecache(inode, oldsize, outarg.attr.size);
M
Miklos Szeredi 已提交
1662
		invalidate_inode_pages2(inode->i_mapping);
1663 1664 1665
	}

	return 0;
M
Miklos Szeredi 已提交
1666 1667 1668 1669 1670 1671

error:
	if (is_truncate)
		fuse_release_nowrite(inode);

	return err;
1672 1673
}

1674 1675
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
1676 1677 1678 1679 1680
	struct inode *inode = entry->d_inode;

	if (!fuse_allow_current_process(get_fuse_conn(inode)))
		return -EACCES;

1681
	if (attr->ia_valid & ATTR_FILE)
1682
		return fuse_do_setattr(inode, attr, attr->ia_file);
1683
	else
1684
		return fuse_do_setattr(inode, attr, NULL);
1685 1686
}

1687 1688 1689 1690
static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
			struct kstat *stat)
{
	struct inode *inode = entry->d_inode;
1691 1692
	struct fuse_conn *fc = get_fuse_conn(inode);

1693
	if (!fuse_allow_current_process(fc))
1694 1695
		return -EACCES;

M
Miklos Szeredi 已提交
1696
	return fuse_update_attributes(inode, stat, NULL, NULL);
1697 1698
}

1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
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;

M
Maxim Patlasov 已提交
1711
	req = fuse_get_req_nopages(fc);
1712 1713
	if (IS_ERR(req))
		return PTR_ERR(req);
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726

	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;
1727
	fuse_request_send(fc, req);
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
	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;

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Maxim Patlasov 已提交
1750
	req = fuse_get_req_nopages(fc);
1751 1752
	if (IS_ERR(req))
		return PTR_ERR(req);
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772

	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;
	}
1773
	fuse_request_send(fc, req);
1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
	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;

1796
	if (!fuse_allow_current_process(fc))
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Miklos Szeredi 已提交
1797 1798
		return -EACCES;

1799 1800 1801
	if (fc->no_listxattr)
		return -EOPNOTSUPP;

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Maxim Patlasov 已提交
1802
	req = fuse_get_req_nopages(fc);
1803 1804
	if (IS_ERR(req))
		return PTR_ERR(req);
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822

	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;
	}
1823
	fuse_request_send(fc, req);
1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846
	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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Maxim Patlasov 已提交
1847
	req = fuse_get_req_nopages(fc);
1848 1849
	if (IS_ERR(req))
		return PTR_ERR(req);
1850 1851 1852 1853 1854 1855

	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;
1856
	fuse_request_send(fc, req);
1857 1858 1859 1860 1861 1862 1863 1864 1865
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
		fc->no_removexattr = 1;
		err = -EOPNOTSUPP;
	}
	return err;
}

1866
static const struct inode_operations fuse_dir_inode_operations = {
1867
	.lookup		= fuse_lookup,
1868 1869 1870 1871 1872 1873 1874 1875
	.mkdir		= fuse_mkdir,
	.symlink	= fuse_symlink,
	.unlink		= fuse_unlink,
	.rmdir		= fuse_rmdir,
	.rename		= fuse_rename,
	.link		= fuse_link,
	.setattr	= fuse_setattr,
	.create		= fuse_create,
1876
	.atomic_open	= fuse_atomic_open,
1877
	.mknod		= fuse_mknod,
1878 1879
	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
1880 1881 1882 1883
	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
1884 1885
};

1886
static const struct file_operations fuse_dir_operations = {
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Miklos Szeredi 已提交
1887
	.llseek		= generic_file_llseek,
1888 1889 1890 1891
	.read		= generic_read_dir,
	.readdir	= fuse_readdir,
	.open		= fuse_dir_open,
	.release	= fuse_dir_release,
1892
	.fsync		= fuse_dir_fsync,
1893 1894
	.unlocked_ioctl	= fuse_dir_ioctl,
	.compat_ioctl	= fuse_dir_compat_ioctl,
1895 1896
};

1897
static const struct inode_operations fuse_common_inode_operations = {
1898
	.setattr	= fuse_setattr,
1899 1900
	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
1901 1902 1903 1904
	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
1905 1906
};

1907
static const struct inode_operations fuse_symlink_inode_operations = {
1908
	.setattr	= fuse_setattr,
1909 1910 1911 1912
	.follow_link	= fuse_follow_link,
	.put_link	= fuse_put_link,
	.readlink	= generic_readlink,
	.getattr	= fuse_getattr,
1913 1914 1915 1916
	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
};

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;
}