Release 4.11 fs/fuse/dir.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2008  Miklos Szeredi <miklos@szeredi.hu>

  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>
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>



static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx)
{
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_inode *fi = get_fuse_inode(dir);

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

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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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union fuse_dentry {
	
u64 time;
	
struct rcu_head rcu;
};



static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
{
	((union fuse_dentry *) entry->d_fsdata)->time = time;
}

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static inline u64 fuse_dentry_time(struct dentry *entry)
{
	return ((union fuse_dentry *) entry->d_fsdata)->time;
}

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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_fsdata and fuse_inode->i_time respectively.
 */

/*
 * Calculate the time in jiffies until a dentry/attributes are valid
 */


static u64 time_to_jiffies(u64 sec, u32 nsec)
{
	if (sec || nsec) {
		struct timespec64 ts = {
			sec,
			min_t(u32, nsec, NSEC_PER_SEC - 1)
		};

		return get_jiffies_64() + timespec64_to_jiffies(&ts);
	} else
		return 0;
}

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/*
 * Set dentry and possibly attribute timeouts from the lookup/mk*
 * replies
 */


static void fuse_change_entry_timeout(struct dentry *entry,
				      struct fuse_entry_out *o)
{
	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);
}

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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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/*
 * Mark the attributes as stale, so that at the next call to
 * ->getattr() they will be fetched from userspace
 */


void fuse_invalidate_attr(struct inode *inode)
{
	get_fuse_inode(inode)->i_time = 0;
}

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/**
 * Mark the attributes as stale due to an atime change.  Avoid the invalidate if
 * atime is not used.
 */


void fuse_invalidate_atime(struct inode *inode)
{
	if (!IS_RDONLY(inode))
		fuse_invalidate_attr(inode);
}

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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)
 */


void fuse_invalidate_entry_cache(struct dentry *entry)
{
	fuse_dentry_settime(entry, 0);
}

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/*
 * Same as fuse_invalidate_entry_cache(), but also try to remove the
 * dentry from the hash
 */


static void fuse_invalidate_entry(struct dentry *entry)
{
	d_invalidate(entry);
	fuse_invalidate_entry_cache(entry);
}

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static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
			     u64 nodeid, const struct qstr *name,
			     struct fuse_entry_out *outarg)
{
	memset(outarg, 0, sizeof(struct fuse_entry_out));
	args->in.h.opcode = FUSE_LOOKUP;
	args->in.h.nodeid = nodeid;
	args->in.numargs = 1;
	args->in.args[0].size = name->len + 1;
	args->in.args[0].value = name->name;
	args->out.numargs = 1;
	args->out.args[0].size = sizeof(struct fuse_entry_out);
	args->out.args[0].value = outarg;
}

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u64 fuse_get_attr_version(struct fuse_conn *fc)
{
	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.
 */


static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
{
	struct inode *inode;
	struct dentry *parent;
	struct fuse_conn *fc;
	struct fuse_inode *fi;
	int ret;

	inode = d_inode_rcu(entry);
	if (inode && is_bad_inode(inode))
		goto invalid;
	else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
		 (flags & LOOKUP_REVAL)) {
		struct fuse_entry_out outarg;
		FUSE_ARGS(args);
		struct fuse_forget_link *forget;
		u64 attr_version;

		/* For negative dentries, always do a fresh lookup */
		if (!inode)
			goto invalid;

		ret = -ECHILD;
		if (flags & LOOKUP_RCU)
			goto out;

		fc = get_fuse_conn(inode);

		forget = fuse_alloc_forget();
		ret = -ENOMEM;
		if (!forget)
			goto out;

		attr_version = fuse_get_attr_version(fc);

		parent = dget_parent(entry);
		fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)),
				 &entry->d_name, &outarg);
		ret = fuse_simple_request(fc, &args);
		dput(parent);
		/* Zero nodeid is same as -ENOENT */
		if (!ret && !outarg.nodeid)
			ret = -ENOENT;
		if (!ret) {
			fi = get_fuse_inode(inode);
			if (outarg.nodeid != get_node_id(inode)) {
				fuse_queue_forget(fc, forget, outarg.nodeid, 1);
				goto invalid;
			}
			spin_lock(&fc->lock);
			fi->nlookup++;
			spin_unlock(&fc->lock);
		}
		kfree(forget);
		if (ret == -ENOMEM)
			goto out;
		if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
			goto invalid;

		forget_all_cached_acls(inode);
		fuse_change_attributes(inode, &outarg.attr,
				       entry_attr_timeout(&outarg),
				       attr_version);
		fuse_change_entry_timeout(entry, &outarg);
	} else if (inode) {
		fi = get_fuse_inode(inode);
		if (flags & LOOKUP_RCU) {
			if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
				return -ECHILD;
		} else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
			parent = dget_parent(entry);
			fuse_advise_use_readdirplus(d_inode(parent));
			dput(parent);
		}
	}
	ret = 1;
out:
	return ret;

invalid:
	ret = 0;
	goto out;
}

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David Howells
7
1.61%
1
4.00%
Anand V. Avati
6
1.38%
1
4.00%
Seth Forshee
5
1.15%
1
4.00%
Nicholas Piggin
4
0.92%
1
4.00%
Feng Shuo
4
0.92%
1
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Al Viro
3
0.69%
1
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435
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static int invalid_nodeid(u64 nodeid)
{
	return !nodeid || nodeid == FUSE_ROOT_ID;
}

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static int fuse_dentry_init(struct dentry *dentry)
{
	dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL);

	return dentry->d_fsdata ? 0 : -ENOMEM;
}
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static void fuse_dentry_release(struct dentry *dentry)
{
	union fuse_dentry *fd = dentry->d_fsdata;

	kfree_rcu(fd, rcu);
}

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const struct dentry_operations fuse_dentry_operations = {
	.d_revalidate	= fuse_dentry_revalidate,
	.d_init		= fuse_dentry_init,
	.d_release	= fuse_dentry_release,
};


const struct dentry_operations fuse_root_dentry_operations = {
	.d_init		= fuse_dentry_init,
	.d_release	= fuse_dentry_release,
};



int fuse_valid_type(int m)
{
	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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1
2.27%
1
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44
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int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
		     struct fuse_entry_out *outarg, struct inode **inode)
{
	struct fuse_conn *fc = get_fuse_conn_super(sb);
	FUSE_ARGS(args);
	struct fuse_forget_link *forget;
	u64 attr_version;
	int err;

	*inode = NULL;
	err = -ENAMETOOLONG;
	if (name->len > FUSE_NAME_MAX)
		goto out;


	forget = fuse_alloc_forget();
	err = -ENOMEM;
	if (!forget)
		goto out;

	attr_version = fuse_get_attr_version(fc);

	fuse_lookup_init(fc, &args, nodeid, name, outarg);
	err = fuse_simple_request(fc, &args);
	/* Zero nodeid is same as -ENOENT, but with valid timeout */
	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) {
		fuse_queue_forget(fc, forget, outarg->nodeid, 1);
		goto out;
	}
	err = 0;

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

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92.31%
Al Viro
1
0.41%
1
7.69%
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242
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13
100.00%



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

	fuse_lock_inode(dir);
	err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
			       &outarg, &inode);
	fuse_unlock_inode(dir);
	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;

	newent = d_splice_alias(inode, entry);
	err = PTR_ERR(newent);
	if (IS_ERR(newent))
		goto out_err;

	entry = newent ? newent : entry;
	if (outarg_valid)
		fuse_change_entry_timeout(entry, &outarg);
	else
		fuse_invalidate_entry_cache(entry);

	fuse_advise_use_readdirplus(dir);
	return newent;

 out_iput:
	iput(inode);
 out_err:
	return ERR_PTR(err);
}

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6
3.05%
2
16.67%
Feng Shuo
5
2.54%
1
8.33%
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12
100.00%

/*
 * Atomic create+open operation
 *
 * If the filesystem doesn't support this, then fall back to separate
 * 'mknod' + 'open' requests.
 */


static int fuse_create_open(struct inode *dir, struct dentry *entry,
			    struct file *file, unsigned flags,
			    umode_t mode, int *opened)
{
	int err;
	struct inode *inode;
	struct fuse_conn *fc = get_fuse_conn(dir);
	FUSE_ARGS(args);
	struct fuse_forget_link *forget;
	struct fuse_create_in inarg;
	struct fuse_open_out outopen;
	struct fuse_entry_out outentry;
	struct fuse_file *ff;

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

	forget = fuse_alloc_forget();
	err = -ENOMEM;
	if (!forget)
		goto out_err;

	err = -ENOMEM;
	ff = fuse_file_alloc(fc);
	if (!ff)
		goto out_put_forget_req;

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

	flags &= ~O_NOCTTY;
	memset(&inarg, 0, sizeof(inarg));
	memset(&outentry, 0, sizeof(outentry));
	inarg.flags = flags;
	inarg.mode = mode;
	inarg.umask = current_umask();
	args.in.h.opcode = FUSE_CREATE;
	args.in.h.nodeid = get_node_id(dir);
	args.in.numargs = 2;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	args.in.args[1].size = entry->d_name.len + 1;
	args.in.args[1].value = entry->d_name.name;
	args.out.numargs = 2;
	args.out.args[0].size = sizeof(outentry);
	args.out.args[0].value = &outentry;
	args.out.args[1].size = sizeof(outopen);
	args.out.args[1].value = &outopen;
	err = fuse_simple_request(fc, &args);
	if (err)
		goto out_free_ff;

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

	ff->fh = outopen.fh;
	ff->nodeid = outentry.nodeid;
	ff->open_flags = outopen.open_flags;
	inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
			  &outentry.attr, entry_attr_timeout(&outentry), 0);
	if (!inode) {
		flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
		fuse_sync_release(ff, flags);
		fuse_queue_forget(fc, forget, outentry.nodeid, 1);
		err = -ENOMEM;
		goto out_err;
	}
	kfree(forget);
	d_instantiate(entry, inode);
	fuse_change_entry_timeout(entry, &outentry);
	fuse_invalidate_attr(dir);
	err = finish_open(file, entry, generic_file_open, opened);
	if (err) {
		fuse_sync_release(ff, flags);
	} else {
		file->private_data = ff;
		fuse_finish_open(inode, file);
	}
	return err;

out_free_ff:
	fuse_file_free(ff);
out_put_forget_req:
	kfree(forget);
out_err:
	return err;
}

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Miklos Szeredi
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97.27%
17
80.95%
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13
2.21%
3
14.29%
Tejun Heo
3
0.51%
1
4.76%
Total
587
100.00%
21
100.00%

static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);


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

	if (d_in_lookup(entry)) {
		res = fuse_lookup(dir, entry, 0);
		if (IS_ERR(res))
			return PTR_ERR(res);

		if (res)
			entry = res;
	}

	if (!(flags & O_CREAT) || d_really_is_positive(entry))
		goto no_open;

	/* Only creates */
	*opened |= FILE_CREATED;

	if (fc->no_create)
		goto mknod;

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

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

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89.05%
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30.00%
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19
9.45%
6
60.00%
David Howells
3
1.49%
1
10.00%
Total
201
100.00%
10
100.00%

/*
 * Code shared between mknod, mkdir, symlink and link
 */


static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
			    struct inode *dir, struct dentry *entry,
			    umode_t mode)
{
	struct fuse_entry_out outarg;
	struct inode *inode;
	int err;
	struct fuse_forget_link *forget;

	forget = fuse_alloc_forget();
	if (!forget)
		return -ENOMEM;

	memset(&outarg, 0, sizeof(outarg));
	args->in.h.nodeid = get_node_id(dir);
	args->out.numargs = 1;
	args->out.args[0].size = sizeof(outarg);
	args->out.args[0].value = &outarg;
	err = fuse_simple_request(fc, args);
	if (err)
		goto out_put_forget_req;

	err = -EIO;
	if (invalid_nodeid(outarg.nodeid))
		goto out_put_forget_req;

	if ((outarg.attr.mode ^ mode) & S_IFMT)
		goto out_put_forget_req;

	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
			  &outarg.attr, entry_attr_timeout(&outarg), 0);
	if (!inode) {
		fuse_queue_forget(fc, forget, outarg.nodeid, 1);
		return -ENOMEM;
	}
	kfree(forget);

	err = d_instantiate_no_diralias(entry, inode);
	if (err)
		return err;

	fuse_change_entry_timeout(entry, &outarg);
	fuse_invalidate_attr(dir);
	return 0;

 out_put_forget_req:
	kfree(forget);
	return err;
}

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Miklos Szeredi
274
99.64%
14
93.33%
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1
0.36%
1
6.67%
Total
275
100.00%
15
100.00%



static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
		      dev_t rdev)
{
	struct fuse_mknod_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
	FUSE_ARGS(args);

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

	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
	inarg.rdev = new_encode_dev(rdev);
	inarg.umask = current_umask();
	args.in.h.opcode = FUSE_MKNOD;
	args.in.numargs = 2;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	args.in.args[1].size = entry->d_name.len + 1;
	args.in.args[1].value = entry->d_name.name;
	return create_new_entry(fc, &args, dir, entry, mode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
187
99.47%
5
83.33%
Al Viro
1
0.53%
1
16.67%
Total
188
100.00%
6
100.00%



static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
		       bool excl)
{
	return fuse_mknod(dir, entry, mode, 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
31
91.18%
2
50.00%
Al Viro
3
8.82%
2
50.00%
Total
34
100.00%
4
100.00%



static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
{
	struct fuse_mkdir_in inarg;
	struct fuse_conn *fc = get_fuse_conn(dir);
	FUSE_ARGS(args);

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

	memset(&inarg, 0, sizeof(inarg));
	inarg.mode = mode;
	inarg.umask = current_umask();
	args.in.h.opcode = FUSE_MKDIR;
	args.in.numargs = 2;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	args.in.args[1].size = entry->d_name.len + 1;
	args.in.args[1].value = entry->d_name.name;
	return create_new_entry(fc, &args, dir, entry, S_IFDIR);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
175
99.43%
4
80.00%
Al Viro
1
0.57%
1
20.00%
Total
176
100.00%
5
100.00%



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;
	FUSE_ARGS(args);

	args.in.h.opcode = FUSE_SYMLINK;
	args.in.numargs = 2;
	args.in.args[0].size = entry->d_name.len + 1;
	args.in.args[0].value = entry->d_name.name;
	args.in.args[1].size = len;
	args.in.args[1].value = link;
	return create_new_entry(fc, &args, dir, entry, S_IFLNK);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
141
100.00%
3
100.00%
Total
141
100.00%
3
100.00%



void fuse_update_ctime(struct inode *inode)
{
	if (!IS_NOCMTIME(inode)) {
		inode->i_ctime = current_time(inode);
		mark_inode_dirty_sync(inode);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Maxim Patlasov
33
97.06%
1
50.00%
Deepa Dinamani
1
2.94%
1
50.00%
Total
34
100.00%
2
100.00%



static int fuse_unlink(struct inode *dir, struct dentry *entry)
{
	int err;
	struct fuse_conn *fc = get_fuse_conn(dir);
	FUSE_ARGS(args);

	args.in.h.opcode = FUSE_UNLINK;
	args.in.h.nodeid = get_node_id(dir);
	args.in.numargs = 1;
	args.in.args[0].size = entry->d_name.len + 1;
	args.in.args[0].value = entry->d_name.name;
	err = fuse_simple_request(fc, &args);
	if (!err) {
		struct inode *inode = d_inode(entry);
		struct fuse_inode *fi = get_fuse_inode(inode);

		spin_lock(&fc->lock);
		fi->attr_version = ++fc->attr_version;
		/*
                 * 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);
		spin_unlock(&fc->lock);
		fuse_invalidate_attr(inode);
		fuse_invalidate_attr(dir);
		fuse_invalidate_entry_cache(entry);
		fuse_update_ctime(inode);
	} else if (err == -EINTR)
		fuse_invalidate_entry(entry);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
203
95.31%
6
66.67%
Maxim Patlasov
5
2.35%
1
11.11%
David Howells
3
1.41%
1
11.11%
Dave Hansen
2
0.94%
1
11.11%
Total
213
100.00%
9
100.00%



static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
	int err;
	struct fuse_conn *fc = get_fuse_conn(dir);
	FUSE_ARGS(args);

	args.in.h.opcode = FUSE_RMDIR;
	args.in.h.nodeid = get_node_id(dir);
	args.in.numargs = 1;
	args.in.args[0].size = entry->d_name.len + 1;
	args.in.args[0].value = entry->d_name.name;
	err = fuse_simple_request(fc, &args);
	if (!err) {
		clear_nlink(d_inode(entry));
		fuse_invalidate_attr(dir);
		fuse_invalidate_entry_cache(entry);
	} else if (err == -EINTR)
		fuse_invalidate_entry(entry);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
146
96.05%
4
66.67%
David Howells
3
1.97%
1
16.67%
Dave Hansen
3
1.97%
1
16.67%
Total
152
100.00%
6
100.00%



static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
			      struct inode *newdir, struct dentry *newent,
			      unsigned int flags, int opcode, size_t argsize)
{
	int err;
	struct fuse_rename2_in inarg;
	struct fuse_conn *fc = get_fuse_conn(olddir);
	FUSE_ARGS(args);

	memset(&inarg, 0, argsize);
	inarg.newdir = get_node_id(newdir);
	inarg.flags = flags;
	args.in.h.opcode = opcode;
	args.in.h.nodeid = get_node_id(olddir);
	args.in.numargs = 3;
	args.in.args[0].size = argsize;
	args.in.args[0].value = &inarg;
	args.in.args[1].size = oldent->d_name.len + 1;
	args.in.args[1].value = oldent->d_name.name;
	args.in.args[2].size = newent->d_name.len + 1;
	args.in.args[2].value = newent->d_name.name;
	err = fuse_simple_request(fc, &args);
	if (!err) {
		/* ctime changes */
		fuse_invalidate_attr(d_inode(oldent));
		fuse_update_ctime(d_inode(oldent));

		if (flags & RENAME_EXCHANGE) {
			fuse_invalidate_attr(d_inode(newent));
			fuse_update_ctime(d_inode(newent));
		}

		fuse_invalidate_attr(olddir);
		if (olddir != newdir)
			fuse_invalidate_attr(newdir);

		/* newent will end up negative */
		if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) {
			fuse_invalidate_attr(d_inode(newent));
			fuse_invalidate_entry_cache(newent);
			fuse_update_ctime(d_inode(newent));
		}
	} 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 (d_really_is_positive(newent))
			fuse_invalidate_entry(newent);
	}

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
322
90.45%
6
75.00%
David Howells
24
6.74%
1
12.50%
Maxim Patlasov
10
2.81%
1
12.50%
Total
356
100.00%
8
100.00%



static int fuse_rename2(struct inode *olddir, struct dentry *oldent,
			struct inode *newdir, struct dentry *newent,
			unsigned int flags)
{
	struct fuse_conn *fc = get_fuse_conn(olddir);
	int err;

	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
		return -EINVAL;

	if (flags) {
		if (fc->no_rename2 || fc->minor < 23)
			return -EINVAL;

		err = fuse_rename_common(olddir, oldent, newdir, newent, flags,
					 FUSE_RENAME2,
					 sizeof(struct fuse_rename2_in));
		if (err == -ENOSYS) {
			fc->no_rename2 = 1;
			err = -EINVAL;
		}
	} else {
		err = fuse_rename_common(olddir, oldent, newdir, newent, 0,
					 FUSE_RENAME,
					 sizeof(struct fuse_rename_in));
	}

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
152
100.00%
2
100.00%
Total
152
100.00%
2
100.00%



static int fuse_link(struct dentry *entry, struct inode *newdir,
		     struct dentry *newent)
{
	int err;
	struct fuse_link_in inarg;
	struct inode *inode = d_inode(entry);
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
245
96.84%
4
66.67%
Maxim Patlasov
5
1.98%
1
16.67%
David Howells
3
1.19%
1
16.67%
Total
253
100.00%
6
100.00%



static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
			  struct kstat *stat)
{
	unsigned int blkbits;
	struct fuse_conn *fc = get_fuse_conn(inode);

	/* see the comment in fuse_change_attributes() */
	if (fc->writeback_cache && S_ISREG(inode->i_mode)) {
		attr->size = i_size_read(inode);
		attr->mtime = inode->i_mtime.tv_sec;
		attr->mtimensec = inode->i_mtime.tv_nsec;
		attr->ctime = inode->i_ctime.tv_sec;
		attr->ctimensec = inode->i_ctime.tv_nsec;
	}

	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;
	stat->uid = make_kuid(&init_user_ns, attr->uid);
	stat->gid = make_kgid(&init_user_ns, attr->gid);
	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;

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

	stat->blksize = 1 << blkbits;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
205
70.21%
2
33.33%
Maxim Patlasov
42
14.38%
2
33.33%
Pavel Emelyanov
33
11.30%
1
16.67%
Eric W. Biedermann
12
4.11%
1
16.67%
Total
292
100.00%
6
100.00%



static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
			   struct file *file)
{
	int err;
	struct fuse_getattr_in inarg;
	struct fuse_attr_out outarg;
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	u64 attr_version;

	attr_version = fuse_get_attr_version(fc);

	memset(&inarg, 0, sizeof(inarg));
	memset(&outarg, 0, sizeof(outarg));
	/* 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;
	}
	args.in.h.opcode = FUSE_GETATTR;
	args.in.h.nodeid = get_node_id(inode);
	args.in.numargs = 1;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	args.out.numargs = 1;
	args.out.args[0].size = sizeof(outarg);
	args.out.args[0].value = &outarg;
	err = fuse_simple_request(fc, &args);
	if (!err) {
		if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
			make_bad_inode(inode);
			err = -EIO;
		} else {
			fuse_change_attributes(inode, &outarg.attr,
					       attr_timeout(&outarg),
					       attr_version);
			if (stat)
				fuse_fillattr(inode, &outarg.attr, stat);
		}
	}
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
304
100.00%
8
100.00%
Total
304
100.00%
8
100.00%



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 (time_before64(fi->i_time, get_jiffies_64())) {
		r = true;
		forget_all_cached_acls(inode);
		err = fuse_do_getattr(inode, stat, file);
	} else {
		r = false;
		err = 0;
		if (stat) {
			generic_fillattr(inode, stat);
			stat->mode = fi->orig_i_mode;
			stat->ino = fi->orig_ino;
		}
	}

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

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
115
89.84%
2
50.00%
Pavel Shilovsky
8
6.25%
1
25.00%
Seth Forshee
5
3.91%
1
25.00%
Total
128
100.00%
4
100.00%



int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
			     u64 child_nodeid, struct qstr *name)
{
	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;

	inode_lock(parent);
	if (!S_ISDIR(parent->i_mode))
		goto unlock;

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

	name->hash = full_name_hash(dir, name->name, name->len);
	entry = d_lookup(dir, name);
	dput(dir);
	if (!entry)
		goto unlock;

	fuse_invalidate_attr(parent);
	fuse_invalidate_entry(entry);

	if (child_nodeid != 0 && d_really_is_positive(entry)) {
		inode_lock(d_inode(entry));
		if (get_node_id(d_inode(entry)) != child_nodeid) {
			err = -ENOENT;
			goto badentry;
		}
		if (d_mountpoint(entry)) {
			err = -EBUSY;
			goto badentry;
		}
		if (d_is_dir(entry)) {
			shrink_dcache_parent(entry);
			if (!simple_empty(entry)) {
				err = -ENOTEMPTY;
				goto badentry;
			}
			d_inode(entry)->i_flags |= S_DEAD;
		}
		dont_mount(entry);
		clear_nlink(d_inode(entry));
		err = 0;
 badentry:
		inode_unlock(d_inode(entry));
		if (!err)
			d_delete(entry);
	} else {
		err = 0;
	}
	dput(entry);

 unlock:
	inode_unlock(parent);
	iput(parent);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
John Muir
277
87.38%
2
33.33%
David Howells
19
5.99%
2
33.33%
Linus Torvalds
17
5.36%
1
16.67%
Al Viro
4
1.26%
1
16.67%
Total
317
100.00%
6
100.00%

/*
 * Calling into a user-controlled filesystem gives the filesystem
 * daemon ptrace-like capabilities over the current process.  This
 * means, that the filesystem daemon is able to record the exact
 * filesystem operations performed, and can also control the behavior
 * of the requester process in otherwise impossible ways.  For example
 * it can delay the operation for arbitrary length of time allowing
 * DoS against the requester.
 *
 * For this reason only those processes can call into the filesystem,
 * for which the owner of the mount has ptrace privilege.  This
 * excludes processes started by other users, suid or sgid processes.
 */


int fuse_allow_current_process(struct fuse_conn *fc)
{
	const struct cred *cred;

	if (fc->allow_other)
		return 1;

	cred = current_cred();
	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))
		return 1;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
53
50.96%
2
33.33%
Eric W. Biedermann
24
23.08%
1
16.67%
David Howells
21
20.19%
2
33.33%
Anatol Pomozov
6
5.77%
1
16.67%
Total
104
100.00%
6
100.00%



static int fuse_access(struct inode *inode, int mask)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	struct fuse_access_in inarg;
	int err;

	BUG_ON(mask & MAY_NOT_BLOCK);

	if (fc->no_access)
		return 0;

	memset(&inarg, 0, sizeof(inarg));
	inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
	args.in.h.opcode = FUSE_ACCESS;
	args.in.h.nodeid = get_node_id(inode);
	args.in.numargs = 1;
	args.in.args[0].size = sizeof(inarg);
	args.in.args[0].value = &inarg;
	err = fuse_simple_request(fc, &args);
	if (err == -ENOSYS) {
		fc->no_access = 1;
		err = 0;
	}
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
164
95.35%
3
75.00%
Al Viro
8
4.65%
1
25.00%
Total
172
100.00%
4
100.00%



static int fuse_perm_getattr(struct inode *inode, int mask)
{
	if (mask & MAY_NOT_BLOCK)
		return -ECHILD;

	forget_all_cached_acls(inode);
	return fuse_do_getattr(inode, NULL, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
31
79.49%
1
33.33%
Seth Forshee
5
12.82%
1
33.33%
Al Viro
3
7.69%
1
33.33%
Total
39
100.00%
3
100.00%

/*
 * 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.
 */


static int fuse_permission(struct inode *inode, int mask)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	bool refreshed = false;
	int err = 0;

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

	/*
         * If attributes are needed, refresh them before proceeding
         */
	if (fc->default_permissions ||
	    ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
		struct fuse_inode *fi = get_fuse_inode(inode);

		if (time_before64(fi->i_time, get_jiffies_64())) {
			refreshed = true;

			err = fuse_perm_getattr(inode, mask);
			if (err)
				return err;
		}
	}

	if (fc->default_permissions) {
		err = generic_permission(inode, mask);

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

		/* 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 */
	} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
		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;

			err = fuse_perm_getattr(inode, mask);
			if (!err && !(inode->i_mode & S_IXUGO))
				return -EACCES;
		}
	}
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
249
96.14%
13
76.47%
Al Viro
5
1.93%
2
11.76%
Eric Paris
4
1.54%
1
5.88%
Anatol Pomozov
1
0.39%
1
5.88%
Total
259
100.00%
17
100.00%



static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
			 struct dir_context *ctx)
{
	while (nbytes >= FUSE_NAME_OFFSET) {
		struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
		size_t reclen = FUSE_DIRENT_SIZE(dirent);
		if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
			return -EIO;
		if (reclen > nbytes)
			break;
		if (memchr(dirent->name, '/', dirent->namelen) != NULL)
			return -EIO;

		if (!dir_emit(ctx, dirent->name, dirent->namelen,
			       dirent->ino, dirent->type))
			break;

		buf += reclen;
		nbytes -= reclen;
		ctx->pos = dirent->off;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
130
92.86%
3
75.00%
Al Viro
10
7.14%
1
25.00%
Total
140
100.00%
4
100.00%



static int fuse_direntplus_link(struct file *file,
				struct fuse_direntplus *direntplus,
				u64 attr_version)
{
	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 = d_inode(parent);
	struct fuse_conn *fc;
	struct inode *inode;
	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);

	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;
	}

	if (invalid_nodeid(o->nodeid))
		return -EIO;
	if (!fuse_valid_type(o->attr.mode))
		return -EIO;

	fc = get_fuse_conn(dir);

	name.hash = full_name_hash(parent, name.name, name.len);
	dentry = d_lookup(parent, &name);
	if (!dentry) {
retry:
		dentry = d_alloc_parallel(parent, &name, &wq);
		if (IS_ERR(dentry))
			return PTR_ERR(dentry);
	}
	if (!d_in_lookup(dentry)) {
		struct fuse_inode *fi;
		inode = d_inode(dentry);
		if (!inode ||
		    get_node_id(inode) != o->nodeid ||
		    ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
			d_invalidate(dentry);
			dput(dentry);
			goto retry;
		}
		if (is_bad_inode(inode)) {
			dput(dentry);
			return -EIO;
		}

		fi = get_fuse_inode(inode);
		spin_lock(&fc->lock);
		fi->nlookup++;
		spin_unlock(&fc->lock);

		forget_all_cached_acls(inode);
		fuse_change_attributes(inode, &o->attr,
				       entry_attr_timeout(o),
				       attr_version);
		/*
                 * The other branch comes via fuse_iget()
                 * which bumps nlookup inside
                 */
	} else {
		inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
				  &o->attr, entry_attr_timeout(o),
				  attr_version);
		if (!inode)
			inode = ERR_PTR(-ENOMEM);

		alias = d_splice_alias(inode, dentry);
		d_lookup_done(dentry);
		if (alias) {
			dput(dentry);
			dentry = alias;
		}
		if (IS_ERR(dentry))
			return PTR_ERR(dentry);
	}
	if (fc->readdirplus_auto)
		set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
	fuse_change_entry_timeout(dentry, o);

	dput(dentry);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Anand V. Avati
301
58.67%
1
10.00%
Miklos Szeredi
92
17.93%
3
30.00%
Al Viro
92
17.93%
2
20.00%
Niels de Vos
16
3.12%
1
10.00%
Seth Forshee
5
0.97%
1
10.00%
David Howells
5
0.97%
1
10.00%
Linus Torvalds
2
0.39%
1
10.00%
Total
513
100.00%
10
100.00%



static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
			     struct dir_context *ctx, 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 (memchr(dirent->name, '/', dirent->namelen) != NULL)
			return -EIO;

		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 = !dir_emit(ctx, dirent->name, dirent->namelen,
				       dirent->ino, dirent->type);
			ctx->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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Anand V. Avati
171
85.50%
1
33.33%
Miklos Szeredi
21
10.50%
1
33.33%
Al Viro
8
4.00%
1
33.33%
Total
200
100.00%
3
100.00%



static int fuse_readdir(struct file *file, struct dir_context *ctx)
{
	int plus, err;
	size_t nbytes;
	struct page *page;
	struct inode *inode = file_inode(file);
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	u64 attr_version = 0;

	if (is_bad_inode(inode))
		return -EIO;

	req = fuse_get_req(fc, 1);
	if (IS_ERR(req))
		return PTR_ERR(req);

	page = alloc_page(GFP_KERNEL);
	if (!page) {
		fuse_put_request(fc, req);
		return -ENOMEM;
	}

	plus = fuse_use_readdirplus(inode, ctx);
	req->out.argpages = 1;
	req->num_pages = 1;
	req->pages[0] = page;
	req->page_descs[0].length = PAGE_SIZE;
	if (plus) {
		attr_version = fuse_get_attr_version(fc);
		fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
			       FUSE_READDIRPLUS);
	} else {
		fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
			       FUSE_READDIR);
	}
	fuse_lock_inode(inode);
	fuse_request_send(fc, req);
	fuse_unlock_inode(inode);
	nbytes = req->out.args[0].size;
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		if (plus) {
			err = parse_dirplusfile(page_address(page), nbytes,
						file, ctx,
						attr_version);
		} else {
			err = parse_dirfile(page_address(page), nbytes, file,
					    ctx);
		}
	}

	__free_page(page);
	fuse_invalidate_atime(inode);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
216
68.35%
10
55.56%
Anand V. Avati
60
18.99%
1
5.56%
Maxim Patlasov
13
4.11%
2
11.11%
Feng Shuo
12
3.80%
1
5.56%
Al Viro
10
3.16%
1
5.56%
Linus Torvalds
3
0.95%
1
5.56%
Tejun Heo
1
0.32%
1
5.56%
Andrew Gallagher
1
0.32%
1
5.56%
Total
316
100.00%
18
100.00%



static const char *fuse_get_link(struct dentry *dentry,
				 struct inode *inode,
				 struct delayed_call *done)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	char *link;
	ssize_t ret;

	if (!dentry)
		return ERR_PTR(-ECHILD);

	link = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!link)
		return ERR_PTR(-ENOMEM);

	args.in.h.opcode = FUSE_READLINK;
	args.in.h.nodeid = get_node_id(inode);
	args.out.argvar = 1;
	args.out.numargs = 1;
	args.out.args[0].size = PAGE_SIZE - 1;
	args.out.args[0].value = link;
	ret = fuse_simple_request(fc, &args);
	if (ret < 0) {
		kfree(link);
		link = ERR_PTR(ret);
	} else {
		link[ret] = '\0';
		set_delayed_call(done, kfree_link, link);
	}
	fuse_invalidate_atime(inode);
	return link;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
164
81.19%
4
44.44%
Al Viro
37
18.32%
4
44.44%
Andrew Gallagher
1
0.50%
1
11.11%
Total
202
100.00%
9
100.00%



static int fuse_dir_open(struct inode *inode, struct file *file)
{
	return fuse_open_common(inode, file, true);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
26
100.00%
4
100.00%
Total
26
100.00%
4
100.00%



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

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
26
100.00%
4
100.00%
Total
26
100.00%
4
100.00%



static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
			  int datasync)
{
	return fuse_fsync_common(file, start, end, datasync, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
24
70.59%
1
50.00%
Josef Bacik
10
29.41%
1
50.00%
Total
34
100.00%
2
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
58
100.00%
1
100.00%
Total
58
100.00%
1
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
59
100.00%
1
100.00%
Total
59
100.00%
1
100.00%



static bool update_mtime(unsigned ivalid, bool trust_local_mtime)
{
	/* Always update if mtime is explicitly set  */
	if (ivalid & ATTR_MTIME_SET)
		return true;

	/* Or if kernel i_mtime is the official one */
	if (trust_local_mtime)
		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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
45
80.36%
1
50.00%
Maxim Patlasov
11
19.64%
1
50.00%
Total
56
100.00%
2
100.00%



static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg,
			   bool trust_local_cmtime)
{
	unsigned ivalid = iattr->ia_valid;

	if (ivalid & ATTR_MODE)
		arg->valid |= FATTR_MODE,   arg->mode = iattr->ia_mode;
	if (ivalid & ATTR_UID)
		arg->valid |= FATTR_UID,    arg->uid = from_kuid(&init_user_ns, iattr->ia_uid);
	if (ivalid & ATTR_GID)
		arg->valid |= FATTR_GID,    arg->gid = from_kgid(&init_user_ns, iattr->ia_gid);
	if (ivalid & ATTR_SIZE)
		arg->valid |= FATTR_SIZE,   arg->size = iattr->ia_size;
	if (ivalid & ATTR_ATIME) {
		arg->valid |= FATTR_ATIME;
		arg->atime = iattr->ia_atime.tv_sec;
		arg->atimensec = iattr->ia_atime.tv_nsec;
		if (!(ivalid & ATTR_ATIME_SET))
			arg->valid |= FATTR_ATIME_NOW;
	}
	if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) {
		arg->valid |= FATTR_MTIME;
		arg->mtime = iattr->ia_mtime.tv_sec;
		arg->mtimensec = iattr->ia_mtime.tv_nsec;
		if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime)
			arg->valid |= FATTR_MTIME_NOW;
	}
	if ((ivalid & ATTR_CTIME) && trust_local_cmtime) {
		arg->valid |= FATTR_CTIME;
		arg->ctime = iattr->ia_ctime.tv_sec;
		arg->ctimensec = iattr->ia_ctime.tv_nsec;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
208
78.20%
4
57.14%
Maxim Patlasov
46
17.29%
2
28.57%
Eric W. Biedermann
12
4.51%
1
14.29%
Total
266
100.00%
7
100.00%

/*
 * 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(!inode_is_locked(inode));

	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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
82
98.80%
1
50.00%
Al Viro
1
1.20%
1
50.00%
Total
83
100.00%
2
100.00%

/*
 * 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%



static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args,
			      struct inode *inode,
			      struct fuse_setattr_in *inarg_p,
			      struct fuse_attr_out *outarg_p)
{
	args->in.h.opcode = FUSE_SETATTR;
	args->in.h.nodeid = get_node_id(inode);
	args->in.numargs = 1;
	args->in.args[0].size = sizeof(*inarg_p);
	args->in.args[0].value = inarg_p;
	args->out.numargs = 1;
	args->out.args[0].size = sizeof(*outarg_p);
	args->out.args[0].value = outarg_p;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Maxim Patlasov
112
86.15%
2
33.33%
Miklos Szeredi
18
13.85%
4
66.67%
Total
130
100.00%
6
100.00%

/*
 * Flush inode->i_mtime to the server
 */


int fuse_flush_times(struct inode *inode, struct fuse_file *ff)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	FUSE_ARGS(args);
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;

	memset(&inarg, 0, sizeof(inarg));
	memset(&outarg, 0, sizeof(outarg));

	inarg.valid = FATTR_MTIME;
	inarg.mtime = inode->i_mtime.tv_sec;
	inarg.mtimensec = inode->i_mtime.tv_nsec;
	if (fc->minor >= 23) {
		inarg.valid |= FATTR_CTIME;
		inarg.ctime = inode->i_ctime.tv_sec;
		inarg.ctimensec = inode->i_ctime.tv_nsec;
	}
	if (ff) {
		inarg.valid |= FATTR_FH;
		inarg.fh = ff->fh;
	}
	fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);

	return fuse_simple_request(fc, &args);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Maxim Patlasov
124
72.51%
3
42.86%
Miklos Szeredi
47
27.49%
4
57.14%
Total
171
100.00%
7
100.00%

/*
 * 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.
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
 */


int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
		    struct file *file)
{
	struct inode *inode = d_inode(dentry);
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	FUSE_ARGS(args);
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;
	bool is_truncate = false;
	bool is_wb = fc->writeback_cache;
	loff_t oldsize;
	int err;
	bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);

	if (!fc->default_permissions)
		attr->ia_valid |= ATTR_FORCE;

	err = setattr_prepare(dentry, attr);
	if (err)
		return err;

	if (attr->ia_valid & ATTR_OPEN) {
		if (fc->atomic_o_trunc)
			return 0;
		file = NULL;
	}

	if (attr->ia_valid & ATTR_SIZE)
		is_truncate = true;

	if (is_truncate) {
		fuse_set_nowrite(inode);
		set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
		if (trust_local_cmtime && attr->ia_size != inode->i_size)
			attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
	}

	memset(&inarg, 0, sizeof(inarg));
	memset(&outarg, 0, sizeof(outarg));
	iattr_to_fattr(attr, &inarg, trust_local_cmtime);
	if (file) {
		struct fuse_file *ff = file->private_data;
		inarg.valid |= FATTR_FH;
		inarg.fh = ff->fh;
	}
	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);
	}
	fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
	err = fuse_simple_request(fc, &args);
	if (err) {
		if (err == -EINTR)
			fuse_invalidate_attr(inode);
		goto error;
	}

	if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
		make_bad_inode(inode);
		err = -EIO;
		goto error;
	}

	spin_lock(&fc->lock);
	/* the kernel maintains i_mtime locally */
	if (trust_local_cmtime) {
		if (attr->ia_valid & ATTR_MTIME)
			inode->i_mtime = attr->ia_mtime;
		if (attr->ia_valid & ATTR_CTIME)
			inode->i_ctime = attr->ia_ctime;
		/* FIXME: clear I_DIRTY_SYNC? */
	}

	fuse_change_attributes_common(inode, &outarg.attr,
				      attr_timeout(&outarg));
	oldsize = inode->i_size;
	/* see the comment in fuse_change_attributes() */
	if (!is_wb || is_truncate || !S_ISREG(inode->i_mode))
		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 ((is_truncate || !is_wb) &&
	    S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
		truncate_pagecache(inode, outarg.attr.size);
		invalidate_inode_pages2(inode->i_mapping);
	}

	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
	return 0;

error:
	if (is_truncate)
		fuse_release_nowrite(inode);

	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
327
57.37%
13
61.90%
Maxim Patlasov
204
35.79%
4
19.05%
Pavel Emelyanov
23
4.04%
1
4.76%
Jan Kara
14
2.46%
2
9.52%
Nicholas Piggin
2
0.35%
1
4.76%
Total
570
100.00%
21
100.00%



static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
	struct inode *inode = d_inode(entry);
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL;
	int ret;

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

	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) {
		attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID |
				    ATTR_MODE);

		/*
                 * The only sane way to reliably kill suid/sgid is to do it in
                 * the userspace filesystem
                 *
                 * This should be done on write(), truncate() and chown().
                 */
		if (!fc->handle_killpriv) {
			/*
                         * ia_mode calculation may have used stale i_mode.
                         * Refresh and recalculate.
                         */
			ret = fuse_do_getattr(inode, NULL, file);
			if (ret)
				return ret;

			attr->ia_mode = inode->i_mode;
			if (inode->i_mode & S_ISUID) {
				attr->ia_valid |= ATTR_MODE;
				attr->ia_mode &= ~S_ISUID;
			}
			if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
				attr->ia_valid |= ATTR_MODE;
				attr->ia_mode &= ~S_ISGID;
			}
		}
	}
	if (!attr->ia_valid)
		return 0;

	ret = fuse_do_setattr(entry, attr, file);
	if (!ret) {
		/*
                 * If filesystem supports acls it may have updated acl xattrs in
                 * the filesystem, so forget cached acls for the inode.
                 */
		if (fc->posix_acl)
			forget_all_cached_acls(inode);

		/* Directory mode changed, may need to revalidate access */
		if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE))
			fuse_invalidate_entry_cache(entry);
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
220
84.94%
5
55.56%
Maxim Patlasov
23
8.88%
1
11.11%
Seth Forshee
12
4.63%
1
11.11%
David Howells
3
1.16%
1
11.11%
Linus Torvalds
1
0.39%
1
11.11%
Total
259
100.00%
9
100.00%



static int fuse_getattr(const struct path *path, struct kstat *stat,
			u32 request_mask, unsigned int flags)
{
	struct inode *inode = d_inode(path->dentry);
	struct fuse_conn *fc = get_fuse_conn(inode);

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

	return fuse_update_attributes(inode, stat, NULL, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
54
77.14%
5
62.50%
David Howells
15
21.43%
2
25.00%
Anatol Pomozov
1
1.43%
1
12.50%
Total
70
100.00%
8
100.00%


static const struct inode_operations fuse_dir_inode_operations = {
	.lookup		= fuse_lookup,
	.mkdir		= fuse_mkdir,
	.symlink	= fuse_symlink,
	.unlink		= fuse_unlink,
	.rmdir		= fuse_rmdir,
	.rename		= fuse_rename2,
	.link		= fuse_link,
	.setattr	= fuse_setattr,
	.create		= fuse_create,
	.atomic_open	= fuse_atomic_open,
	.mknod		= fuse_mknod,
	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
	.listxattr	= fuse_listxattr,
	.get_acl	= fuse_get_acl,
	.set_acl	= fuse_set_acl,
};


static const struct file_operations fuse_dir_operations = {
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.iterate_shared	= fuse_readdir,
	.open		= fuse_dir_open,
	.release	= fuse_dir_release,
	.fsync		= fuse_dir_fsync,
	.unlocked_ioctl	= fuse_dir_ioctl,
	.compat_ioctl	= fuse_dir_compat_ioctl,
};


static const struct inode_operations fuse_common_inode_operations = {
	.setattr	= fuse_setattr,
	.permission	= fuse_permission,
	.getattr	= fuse_getattr,
	.listxattr	= fuse_listxattr,
	.get_acl	= fuse_get_acl,
	.set_acl	= fuse_set_acl,
};


static const struct inode_operations fuse_symlink_inode_operations = {
	.setattr	= fuse_setattr,
	.get_link	= fuse_get_link,
	.getattr	= fuse_getattr,
	.listxattr	= fuse_listxattr,
};



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
24
100.00%
1
100.00%
Total
24
100.00%
1
100.00%



void fuse_init_symlink(struct inode *inode)
{
	inode->i_op = &fuse_symlink_inode_operations;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Miklos Szeredi
7358
76.91%
90
56.60%
Maxim Patlasov
630
6.59%
9
5.66%
Anand V. Avati
538
5.62%
2
1.26%
John Muir
277
2.90%
2
1.26%
Al Viro
235
2.46%
24
15.09%
Feng Shuo
123
1.29%
1
0.63%
David Howells
106
1.11%
5
3.14%
Pavel Emelyanov
56
0.59%
1
0.63%
Seth Forshee
54
0.56%
2
1.26%
Eric W. Biedermann
48
0.50%
1
0.63%
Andrew Gallagher
26
0.27%
1
0.63%
Linus Torvalds
23
0.24%
3
1.89%
Niels de Vos
16
0.17%
1
0.63%
Jan Kara
14
0.15%
2
1.26%
Eric Wong
10
0.10%
1
0.63%
Josef Bacik
10
0.10%
1
0.63%
Anatol Pomozov
9
0.09%
1
0.63%
Pavel Shilovsky
8
0.08%
1
0.63%
Nicholas Piggin
6
0.06%
2
1.26%
Dave Hansen
5
0.05%
1
0.63%
Eric Paris
4
0.04%
1
0.63%
Tejun Heo
4
0.04%
2
1.26%
Arjan van de Ven
4
0.04%
2
1.26%
Timo Savola
1
0.01%
1
0.63%
Deepa Dinamani
1
0.01%
1
0.63%
David Sheets
1
0.01%
1
0.63%
Total
9567
100.00%
159
100.00%
Directory: fs/fuse

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