dir.c 46.6 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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184
	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_conn *fc;
		struct fuse_req *req;
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		struct fuse_forget_link *forget;
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		struct dentry *parent;
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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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	}
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	fuse_advise_use_readdirplus(inode);
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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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312
	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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365 366
	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);
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	}
375

376
	entry = newent ? newent : entry;
377
	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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382
	fuse_advise_use_readdirplus(dir);
383
	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;
406
	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);

414
	forget = fuse_alloc_forget();
415
	err = -ENOMEM;
416
	if (!forget)
417
		goto out_err;
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	req = fuse_get_req_nopages(fc);
420
	err = PTR_ERR(req);
421
	if (IS_ERR(req))
422
		goto out_put_forget_req;
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424
	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));
434
	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;
454
	fuse_request_send(fc, req);
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	err = req->out.h.error;
456
	if (err)
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		goto out_free_ff;

	err = -EIO;
460
	if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
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		goto out_free_ff;

463
	fuse_put_request(fc, req);
464 465 466
	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,
468
			  &outentry.attr, entry_attr_timeout(&outentry), 0);
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	if (!inode) {
		flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
471
		fuse_sync_release(ff, flags);
472
		fuse_queue_forget(fc, forget, outentry.nodeid, 1);
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		err = -ENOMEM;
		goto out_err;
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	}
476
	kfree(forget);
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	d_instantiate(entry, inode);
478
	fuse_change_entry_timeout(entry, &outentry);
479
	fuse_invalidate_attr(dir);
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	err = finish_open(file, entry, generic_file_open, opened);
	if (err) {
482
		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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489
out_free_ff:
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	fuse_file_free(ff);
491
out_put_request:
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	fuse_put_request(fc, req);
493
out_put_forget_req:
494
	kfree(forget);
495
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)
503 504 505 506 507 508
{
	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);
510
		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 */
521
	*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;
534 535 536

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
 */
546 547
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)
549 550 551 552
{
	struct fuse_entry_out outarg;
	struct inode *inode;
	int err;
553
	struct fuse_forget_link *forget;
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555 556
	forget = fuse_alloc_forget();
	if (!forget) {
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		fuse_put_request(fc, req);
558
		return -ENOMEM;
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	}
560

561
	memset(&outarg, 0, sizeof(outarg));
562 563
	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);
568
	req->out.args[0].value = &outarg;
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	fuse_request_send(fc, req);
570
	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;
581

582
	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
583
			  &outarg.attr, entry_attr_timeout(&outarg), 0);
584
	if (!inode) {
585
		fuse_queue_forget(fc, forget, outarg.nodeid, 1);
586 587
		return -ENOMEM;
	}
588
	kfree(forget);
589

590 591 592 593 594 595 596 597 598 599 600 601 602 603 604
	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);
605

606
	fuse_change_entry_timeout(entry, &outarg);
607 608
	fuse_invalidate_attr(dir);
	return 0;
609

M
Miklos Szeredi 已提交
610
 out_put_forget_req:
611
	kfree(forget);
612
	return err;
613 614
}

A
Al Viro 已提交
615
static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
616 617 618 619
		      dev_t rdev)
{
	struct fuse_mknod_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
M
Maxim Patlasov 已提交
620
	struct fuse_req *req = fuse_get_req_nopages(fc);
621 622
	if (IS_ERR(req))
		return PTR_ERR(req);
623

624 625 626
	if (!fc->dont_mask)
		mode &= ~current_umask();

627 628 629
	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
	inarg.rdev = new_encode_dev(rdev);
630
	inarg.umask = current_umask();
631 632
	req->in.h.opcode = FUSE_MKNOD;
	req->in.numargs = 2;
633 634
	req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
						sizeof(inarg);
635 636 637 638 639 640
	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
641
static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
A
Al Viro 已提交
642
		       bool excl)
643 644 645 646
{
	return fuse_mknod(dir, entry, mode, 0);
}

647
static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
648 649 650
{
	struct fuse_mkdir_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
M
Maxim Patlasov 已提交
651
	struct fuse_req *req = fuse_get_req_nopages(fc);
652 653
	if (IS_ERR(req))
		return PTR_ERR(req);
654

655 656 657
	if (!fc->dont_mask)
		mode &= ~current_umask();

658 659
	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
660
	inarg.umask = current_umask();
661 662 663 664 665 666 667 668 669 670 671 672 673 674
	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
675
	struct fuse_req *req = fuse_get_req_nopages(fc);
676 677
	if (IS_ERR(req))
		return PTR_ERR(req);
678 679 680 681 682 683 684 685 686 687 688 689 690 691

	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
692
	struct fuse_req *req = fuse_get_req_nopages(fc);
693 694
	if (IS_ERR(req))
		return PTR_ERR(req);
695 696 697 698 699 700

	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;
701
	fuse_request_send(fc, req);
702 703 704 705
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		struct inode *inode = entry->d_inode;
M
Miklos Szeredi 已提交
706
		struct fuse_inode *fi = get_fuse_inode(inode);
707

M
Miklos Szeredi 已提交
708 709
		spin_lock(&fc->lock);
		fi->attr_version = ++fc->attr_version;
710 711 712 713 714 715 716 717
		/*
		 * 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
718
		spin_unlock(&fc->lock);
719 720
		fuse_invalidate_attr(inode);
		fuse_invalidate_attr(dir);
721
		fuse_invalidate_entry_cache(entry);
722 723 724 725 726 727 728 729 730
	} 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
731
	struct fuse_req *req = fuse_get_req_nopages(fc);
732 733
	if (IS_ERR(req))
		return PTR_ERR(req);
734 735 736 737 738 739

	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;
740
	fuse_request_send(fc, req);
741 742 743
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
744
		clear_nlink(entry->d_inode);
745
		fuse_invalidate_attr(dir);
746
		fuse_invalidate_entry_cache(entry);
747 748 749 750 751 752 753 754 755 756 757
	} 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
758
	struct fuse_req *req = fuse_get_req_nopages(fc);
759

760 761
	if (IS_ERR(req))
		return PTR_ERR(req);
762 763 764 765 766 767 768 769 770 771 772 773

	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;
774
	fuse_request_send(fc, req);
775 776 777
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
778 779 780
		/* ctime changes */
		fuse_invalidate_attr(oldent->d_inode);

781 782 783
		fuse_invalidate_attr(olddir);
		if (olddir != newdir)
			fuse_invalidate_attr(newdir);
784 785

		/* newent will end up negative */
M
Miklos Szeredi 已提交
786 787
		if (newent->d_inode) {
			fuse_invalidate_attr(newent->d_inode);
788
			fuse_invalidate_entry_cache(newent);
M
Miklos Szeredi 已提交
789
		}
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
	} 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
811
	struct fuse_req *req = fuse_get_req_nopages(fc);
812 813
	if (IS_ERR(req))
		return PTR_ERR(req);
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829

	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
830 831 832 833 834 835 836
	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);
837
		fuse_invalidate_attr(inode);
M
Miklos Szeredi 已提交
838 839 840
	} else if (err == -EINTR) {
		fuse_invalidate_attr(inode);
	}
841 842 843
	return err;
}

844 845 846
static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
			  struct kstat *stat)
{
M
Miklos Szeredi 已提交
847 848
	unsigned int blkbits;

849 850 851 852
	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;
853 854
	stat->uid = make_kuid(&init_user_ns, attr->uid);
	stat->gid = make_kgid(&init_user_ns, attr->gid);
855 856 857 858 859 860 861 862 863
	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
864 865 866 867 868 869 870

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

	stat->blksize = 1 << blkbits;
871 872
}

873 874
static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
			   struct file *file)
875 876
{
	int err;
877 878
	struct fuse_getattr_in inarg;
	struct fuse_attr_out outarg;
879
	struct fuse_conn *fc = get_fuse_conn(inode);
880 881 882
	struct fuse_req *req;
	u64 attr_version;

M
Maxim Patlasov 已提交
883
	req = fuse_get_req_nopages(fc);
884 885
	if (IS_ERR(req))
		return PTR_ERR(req);
886

887
	attr_version = fuse_get_attr_version(fc);
888

889
	memset(&inarg, 0, sizeof(inarg));
890
	memset(&outarg, 0, sizeof(outarg));
891 892 893 894 895 896 897
	/* 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;
	}
898 899
	req->in.h.opcode = FUSE_GETATTR;
	req->in.h.nodeid = get_node_id(inode);
900 901 902
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
903
	req->out.numargs = 1;
904 905 906 907
	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(outarg);
908
	req->out.args[0].value = &outarg;
909
	fuse_request_send(fc, req);
910 911 912
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
913
		if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
914 915 916
			make_bad_inode(inode);
			err = -EIO;
		} else {
917 918
			fuse_change_attributes(inode, &outarg.attr,
					       attr_timeout(&outarg),
919 920
					       attr_version);
			if (stat)
921
				fuse_fillattr(inode, &outarg.attr, stat);
922 923 924 925 926
		}
	}
	return err;
}

M
Miklos Szeredi 已提交
927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
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;
943
			stat->ino = fi->orig_ino;
M
Miklos Szeredi 已提交
944 945 946 947 948 949 950 951 952
		}
	}

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

	return err;
}

J
John Muir 已提交
953
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
954
			     u64 child_nodeid, struct qstr *name)
J
John Muir 已提交
955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
{
	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);
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009

	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
1010 1011 1012 1013 1014 1015 1016 1017
	dput(entry);

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

1018 1019
/*
 * Calling into a user-controlled filesystem gives the filesystem
1020
 * daemon ptrace-like capabilities over the current process.  This
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
 * 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.
 */
1031
int fuse_allow_current_process(struct fuse_conn *fc)
1032
{
1033
	const struct cred *cred;
1034

1035
	if (fc->flags & FUSE_ALLOW_OTHER)
1036 1037
		return 1;

1038
	cred = current_cred();
1039 1040 1041 1042 1043 1044
	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))
1045
		return 1;
1046

1047
	return 0;
1048 1049
}

M
Miklos Szeredi 已提交
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
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
1060
	req = fuse_get_req_nopages(fc);
1061 1062
	if (IS_ERR(req))
		return PTR_ERR(req);
M
Miklos Szeredi 已提交
1063 1064

	memset(&inarg, 0, sizeof(inarg));
1065
	inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
M
Miklos Szeredi 已提交
1066 1067 1068 1069 1070
	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;
1071
	fuse_request_send(fc, req);
M
Miklos Szeredi 已提交
1072 1073 1074 1075 1076 1077 1078 1079 1080
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
		fc->no_access = 1;
		err = 0;
	}
	return err;
}

1081
static int fuse_perm_getattr(struct inode *inode, int mask)
1082
{
1083
	if (mask & MAY_NOT_BLOCK)
1084 1085 1086 1087 1088
		return -ECHILD;

	return fuse_do_getattr(inode, NULL, NULL);
}

1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101
/*
 * 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.
 */
1102
static int fuse_permission(struct inode *inode, int mask)
1103 1104
{
	struct fuse_conn *fc = get_fuse_conn(inode);
1105 1106
	bool refreshed = false;
	int err = 0;
1107

1108
	if (!fuse_allow_current_process(fc))
1109
		return -EACCES;
1110 1111

	/*
1112
	 * If attributes are needed, refresh them before proceeding
1113
	 */
1114 1115
	if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
	    ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
1116 1117 1118 1119 1120
		struct fuse_inode *fi = get_fuse_inode(inode);

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

1121
			err = fuse_perm_getattr(inode, mask);
1122 1123 1124
			if (err)
				return err;
		}
1125 1126 1127
	}

	if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
1128
		err = generic_permission(inode, mask);
M
Miklos Szeredi 已提交
1129 1130 1131 1132

		/* If permission is denied, try to refresh file
		   attributes.  This is also needed, because the root
		   node will at first have no permissions */
1133
		if (err == -EACCES && !refreshed) {
1134
			err = fuse_perm_getattr(inode, mask);
M
Miklos Szeredi 已提交
1135
			if (!err)
1136
				err = generic_permission(inode, mask);
M
Miklos Szeredi 已提交
1137 1138
		}

1139 1140 1141 1142
		/* 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
1143
	} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1144
		if (mask & MAY_NOT_BLOCK)
1145 1146
			return -ECHILD;

1147 1148 1149 1150 1151 1152
		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;

1153
			err = fuse_perm_getattr(inode, mask);
1154 1155 1156
			if (!err && !(inode->i_mode & S_IXUGO))
				return -EACCES;
		}
1157
	}
1158
	return err;
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
}

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;
}

1186 1187 1188 1189 1190 1191 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
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;
}

1323
static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1324
{
1325
	int plus, err;
1326 1327
	size_t nbytes;
	struct page *page;
A
Al Viro 已提交
1328
	struct inode *inode = file_inode(file);
1329
	struct fuse_conn *fc = get_fuse_conn(inode);
1330
	struct fuse_req *req;
1331
	u64 attr_version = 0;
1332 1333 1334 1335

	if (is_bad_inode(inode))
		return -EIO;

M
Maxim Patlasov 已提交
1336
	req = fuse_get_req(fc, 1);
1337 1338
	if (IS_ERR(req))
		return PTR_ERR(req);
1339

1340 1341 1342 1343 1344
	page = alloc_page(GFP_KERNEL);
	if (!page) {
		fuse_put_request(fc, req);
		return -ENOMEM;
	}
1345 1346

	plus = fuse_use_readdirplus(inode, file);
1347
	req->out.argpages = 1;
1348 1349
	req->num_pages = 1;
	req->pages[0] = page;
1350
	req->page_descs[0].length = PAGE_SIZE;
1351
	if (plus) {
1352 1353 1354 1355 1356 1357 1358
		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);
	}
1359
	fuse_request_send(fc, req);
1360
	nbytes = req->out.args[0].size;
1361 1362
	err = req->out.h.error;
	fuse_put_request(fc, req);
1363
	if (!err) {
1364
		if (plus) {
1365 1366 1367 1368 1369 1370 1371 1372
			err = parse_dirplusfile(page_address(page), nbytes,
						file, dstbuf, filldir,
						attr_version);
		} else {
			err = parse_dirfile(page_address(page), nbytes, file,
					    dstbuf, filldir);
		}
	}
1373

1374
	__free_page(page);
1375
	fuse_invalidate_attr(inode); /* atime changed */
1376
	return err;
1377 1378 1379 1380 1381 1382
}

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
1383
	struct fuse_req *req = fuse_get_req_nopages(fc);
1384 1385
	char *link;

1386
	if (IS_ERR(req))
1387
		return ERR_CAST(req);
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399

	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;
1400
	fuse_request_send(fc, req);
1401 1402 1403 1404 1405 1406 1407
	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);
1408
	fuse_invalidate_attr(inode); /* atime changed */
1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
	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)
{
1431
	return fuse_open_common(inode, file, true);
1432 1433 1434 1435
}

static int fuse_dir_release(struct inode *inode, struct file *file)
{
1436 1437 1438
	fuse_release_common(file, FUSE_RELEASEDIR);

	return 0;
1439 1440
}

1441 1442
static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
			  int datasync)
1443
{
1444
	return fuse_fsync_common(file, start, end, datasync, 1);
1445 1446
}

1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
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
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
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;
}

1485
static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
1486 1487 1488 1489
{
	unsigned ivalid = iattr->ia_valid;

	if (ivalid & ATTR_MODE)
1490
		arg->valid |= FATTR_MODE,   arg->mode = iattr->ia_mode;
1491
	if (ivalid & ATTR_UID)
1492
		arg->valid |= FATTR_UID,    arg->uid = from_kuid(&init_user_ns, iattr->ia_uid);
1493
	if (ivalid & ATTR_GID)
1494
		arg->valid |= FATTR_GID,    arg->gid = from_kgid(&init_user_ns, iattr->ia_gid);
1495
	if (ivalid & ATTR_SIZE)
1496
		arg->valid |= FATTR_SIZE,   arg->size = iattr->ia_size;
M
Miklos Szeredi 已提交
1497 1498
	if (ivalid & ATTR_ATIME) {
		arg->valid |= FATTR_ATIME;
1499
		arg->atime = iattr->ia_atime.tv_sec;
M
Miklos Szeredi 已提交
1500 1501 1502 1503 1504 1505
		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;
1506
		arg->mtime = iattr->ia_mtime.tv_sec;
M
Miklos Szeredi 已提交
1507 1508 1509
		arg->mtimensec = iattr->ia_mtime.tv_nsec;
		if (!(ivalid & ATTR_MTIME_SET))
			arg->valid |= FATTR_MTIME_NOW;
1510
	}
1511 1512
}

M
Miklos Szeredi 已提交
1513 1514 1515 1516 1517 1518 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
/*
 * 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);
}

1557 1558 1559 1560 1561
/*
 * 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
1562 1563
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
1564
 */
1565 1566
int fuse_do_setattr(struct inode *inode, struct iattr *attr,
		    struct file *file)
1567 1568 1569 1570 1571
{
	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
1572 1573
	bool is_truncate = false;
	loff_t oldsize;
1574 1575
	int err;

1576 1577 1578 1579 1580 1581
	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
1582

M
Miklos Szeredi 已提交
1583 1584 1585 1586 1587
	if (attr->ia_valid & ATTR_OPEN) {
		if (fc->atomic_o_trunc)
			return 0;
		file = NULL;
	}
1588

1589
	if (attr->ia_valid & ATTR_SIZE)
M
Miklos Szeredi 已提交
1590
		is_truncate = true;
1591

M
Maxim Patlasov 已提交
1592
	req = fuse_get_req_nopages(fc);
1593 1594
	if (IS_ERR(req))
		return PTR_ERR(req);
1595

M
Miklos Szeredi 已提交
1596 1597 1598
	if (is_truncate)
		fuse_set_nowrite(inode);

1599
	memset(&inarg, 0, sizeof(inarg));
1600
	memset(&outarg, 0, sizeof(outarg));
1601
	iattr_to_fattr(attr, &inarg);
1602 1603 1604 1605 1606
	if (file) {
		struct fuse_file *ff = file->private_data;
		inarg.valid |= FATTR_FH;
		inarg.fh = ff->fh;
	}
1607 1608 1609 1610 1611
	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);
	}
1612 1613 1614 1615 1616 1617
	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;
1618 1619 1620 1621
	if (fc->minor < 9)
		req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
	else
		req->out.args[0].size = sizeof(outarg);
1622
	req->out.args[0].value = &outarg;
1623
	fuse_request_send(fc, req);
1624 1625
	err = req->out.h.error;
	fuse_put_request(fc, req);
1626 1627 1628
	if (err) {
		if (err == -EINTR)
			fuse_invalidate_attr(inode);
M
Miklos Szeredi 已提交
1629
		goto error;
1630
	}
1631

1632 1633
	if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
		make_bad_inode(inode);
M
Miklos Szeredi 已提交
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654
		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
1655
		truncate_pagecache(inode, oldsize, outarg.attr.size);
M
Miklos Szeredi 已提交
1656
		invalidate_inode_pages2(inode->i_mapping);
1657 1658 1659
	}

	return 0;
M
Miklos Szeredi 已提交
1660 1661 1662 1663 1664 1665

error:
	if (is_truncate)
		fuse_release_nowrite(inode);

	return err;
1666 1667
}

1668 1669
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
1670 1671 1672 1673 1674
	struct inode *inode = entry->d_inode;

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

1675
	if (attr->ia_valid & ATTR_FILE)
1676
		return fuse_do_setattr(inode, attr, attr->ia_file);
1677
	else
1678
		return fuse_do_setattr(inode, attr, NULL);
1679 1680
}

1681 1682 1683 1684
static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
			struct kstat *stat)
{
	struct inode *inode = entry->d_inode;
1685 1686
	struct fuse_conn *fc = get_fuse_conn(inode);

1687
	if (!fuse_allow_current_process(fc))
1688 1689
		return -EACCES;

M
Miklos Szeredi 已提交
1690
	return fuse_update_attributes(inode, stat, NULL, NULL);
1691 1692
}

1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
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
1705
	req = fuse_get_req_nopages(fc);
1706 1707
	if (IS_ERR(req))
		return PTR_ERR(req);
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720

	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;
1721
	fuse_request_send(fc, req);
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
	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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	req = fuse_get_req_nopages(fc);
1745 1746
	if (IS_ERR(req))
		return PTR_ERR(req);
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766

	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;
	}
1767
	fuse_request_send(fc, req);
1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789
	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;

1790
	if (!fuse_allow_current_process(fc))
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		return -EACCES;

1793 1794 1795
	if (fc->no_listxattr)
		return -EOPNOTSUPP;

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1796
	req = fuse_get_req_nopages(fc);
1797 1798
	if (IS_ERR(req))
		return PTR_ERR(req);
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816

	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;
	}
1817
	fuse_request_send(fc, req);
1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840
	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_nopages(fc);
1842 1843
	if (IS_ERR(req))
		return PTR_ERR(req);
1844 1845 1846 1847 1848 1849

	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;
1850
	fuse_request_send(fc, req);
1851 1852 1853 1854 1855 1856 1857 1858 1859
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
		fc->no_removexattr = 1;
		err = -EOPNOTSUPP;
	}
	return err;
}

1860
static const struct inode_operations fuse_dir_inode_operations = {
1861
	.lookup		= fuse_lookup,
1862 1863 1864 1865 1866 1867 1868 1869
	.mkdir		= fuse_mkdir,
	.symlink	= fuse_symlink,
	.unlink		= fuse_unlink,
	.rmdir		= fuse_rmdir,
	.rename		= fuse_rename,
	.link		= fuse_link,
	.setattr	= fuse_setattr,
	.create		= fuse_create,
1870
	.atomic_open	= fuse_atomic_open,
1871
	.mknod		= fuse_mknod,
1872 1873
	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
1874 1875 1876 1877
	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
1878 1879
};

1880
static const struct file_operations fuse_dir_operations = {
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	.llseek		= generic_file_llseek,
1882 1883 1884 1885
	.read		= generic_read_dir,
	.readdir	= fuse_readdir,
	.open		= fuse_dir_open,
	.release	= fuse_dir_release,
1886
	.fsync		= fuse_dir_fsync,
1887 1888
	.unlocked_ioctl	= fuse_dir_ioctl,
	.compat_ioctl	= fuse_dir_compat_ioctl,
1889 1890
};

1891
static const struct inode_operations fuse_common_inode_operations = {
1892
	.setattr	= fuse_setattr,
1893 1894
	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
1895 1896 1897 1898
	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
1899 1900
};

1901
static const struct inode_operations fuse_symlink_inode_operations = {
1902
	.setattr	= fuse_setattr,
1903 1904 1905 1906
	.follow_link	= fuse_follow_link,
	.put_link	= fuse_put_link,
	.readlink	= generic_readlink,
	.getattr	= fuse_getattr,
1907 1908 1909 1910
	.setxattr	= fuse_setxattr,
	.getxattr	= fuse_getxattr,
	.listxattr	= fuse_listxattr,
	.removexattr	= fuse_removexattr,
1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927
};

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;
}