Ejemplo n.º 1
0
/*
 * initial procedure of adding a new entry.
 * prepare writable branch and the parent dir, lock it,
 * and lookup whiteout for the new entry.
 */
static struct dentry*
lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
		  struct dentry *src_dentry, struct au_pin *pin,
		  struct au_wr_dir_args *wr_dir_args)
{
	struct dentry *wh_dentry, *h_parent;
	struct super_block *sb;
	struct au_branch *br;
	int err;
	unsigned int udba;
	aufs_bindex_t bcpup;

	AuDbg("%.*s\n", AuDLNPair(dentry));

	err = au_wr_dir(dentry, src_dentry, wr_dir_args);
	bcpup = err;
	wh_dentry = ERR_PTR(err);
	if (unlikely(err < 0))
		goto out;

	sb = dentry->d_sb;
	udba = au_opt_udba(sb);
	err = au_pin(pin, dentry, bcpup, udba,
		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
	wh_dentry = ERR_PTR(err);
	if (unlikely(err))
		goto out;

	h_parent = au_pinned_h_parent(pin);
	if (udba != AuOpt_UDBA_NONE
	    && au_dbstart(dentry) == bcpup)
		err = au_may_add(dentry, bcpup, h_parent,
				 au_ftest_wrdir(wr_dir_args->flags, ISDIR));
	else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
		err = -ENAMETOOLONG;
	wh_dentry = ERR_PTR(err);
	if (unlikely(err))
		goto out_unpin;

	br = au_sbr(sb, bcpup);
	if (dt) {
		struct path tmp = {
			.dentry	= h_parent,
			.mnt	= br->br_mnt
		};
		au_dtime_store(dt, au_pinned_parent(pin), &tmp);
	}

	wh_dentry = NULL;
	if (bcpup != au_dbwh(dentry))
		goto out; /* success */

	wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br);

out_unpin:
	if (IS_ERR(wh_dentry))
		au_unpin(pin);
out:
	return wh_dentry;
}

/* ---------------------------------------------------------------------- */

enum { Mknod, Symlink, Creat };
struct simple_arg {
	int type;
	union {
		struct {
			int mode;
			struct nameidata *nd;
		} c;
		struct {
			const char *symname;
		} s;
		struct {
			int mode;
			dev_t dev;
		} m;
	} u;
};

static int add_simple(struct inode *dir, struct dentry *dentry,
		      struct simple_arg *arg)
{
	int err;
	aufs_bindex_t bstart;
	unsigned char created;
	struct au_dtime dt;
	struct au_pin pin;
	struct path h_path;
	struct dentry *wh_dentry, *parent;
	struct inode *h_dir;
	struct au_wr_dir_args wr_dir_args = {
		.force_btgt	= -1,
		.flags		= AuWrDir_ADD_ENTRY
	};

	AuDbg("%.*s\n", AuDLNPair(dentry));
	IMustLock(dir);

	parent = dentry->d_parent; /* dir inode is locked */
	err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
	if (unlikely(err))
		goto out;
	err = au_d_may_add(dentry);
	if (unlikely(err))
		goto out_unlock;
	di_write_lock_parent(parent);
	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL, &pin,
				      &wr_dir_args);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	bstart = au_dbstart(dentry);
	h_path.dentry = au_h_dptr(dentry, bstart);
	h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
	h_dir = au_pinned_h_dir(&pin);
	switch (arg->type) {
	case Creat:
		err = vfsub_create(h_dir, &h_path, arg->u.c.mode);
		break;
	case Symlink:
		err = vfsub_symlink(h_dir, &h_path, arg->u.s.symname);
		break;
	case Mknod:
		err = vfsub_mknod(h_dir, &h_path, arg->u.m.mode, arg->u.m.dev);
		break;
	default:
		BUG();
	}
	created = !err;
	if (!err)
		err = epilog(dir, bstart, wh_dentry, dentry);

	/* revert */
	if (unlikely(created && err && h_path.dentry->d_inode)) {
		int rerr;
		rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
		if (rerr) {
			AuIOErr("%.*s revert failure(%d, %d)\n",
				AuDLNPair(dentry), err, rerr);
			err = -EIO;
		}
		au_dtime_revert(&dt);
	}

	au_unpin(&pin);
	dput(wh_dentry);

out_parent:
	di_write_unlock(parent);
out_unlock:
	if (unlikely(err)) {
		au_update_dbstart(dentry);
		d_drop(dentry);
	}
	aufs_read_unlock(dentry, AuLock_DW);
out:
	return err;
}

int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
	struct simple_arg arg = {
		.type = Mknod,
		.u.m = {
			.mode	= mode,
			.dev	= dev
		}
	};
	return add_simple(dir, dentry, &arg);
}

int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
	struct simple_arg arg = {
		.type = Symlink,
		.u.s.symname = symname
	};
	return add_simple(dir, dentry, &arg);
}

int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
		struct nameidata *nd)
{
	struct simple_arg arg = {
		.type = Creat,
		.u.c = {
			.mode	= mode,
			.nd	= nd
		}
	};
	return add_simple(dir, dentry, &arg);
}

/* ---------------------------------------------------------------------- */

struct au_link_args {
	aufs_bindex_t bdst, bsrc;
	struct au_pin pin;
	struct path h_path;
	struct dentry *src_parent, *parent;
};

static int au_cpup_before_link(struct dentry *src_dentry,
			       struct au_link_args *a)
{
	int err;
	struct dentry *h_src_dentry;
	struct mutex *h_mtx;
	struct file *h_file;

	di_read_lock_parent(a->src_parent, AuLock_IR);
	err = au_test_and_cpup_dirs(src_dentry, a->bdst);
	if (unlikely(err))
		goto out;

	h_src_dentry = au_h_dptr(src_dentry, a->bsrc);
	h_mtx = &h_src_dentry->d_inode->i_mutex;
	err = au_pin(&a->pin, src_dentry, a->bdst,
		     au_opt_udba(src_dentry->d_sb),
		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
	if (unlikely(err))
		goto out;
	mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
	h_file = au_h_open_pre(src_dentry, a->bsrc);
	if (IS_ERR(h_file)) {
		err = PTR_ERR(h_file);
		h_file = NULL;
	} else
		err = au_sio_cpup_simple(src_dentry, a->bdst, a->bsrc,
					 AuCpup_DTIME /* | AuCpup_KEEPLINO */);
	mutex_unlock(h_mtx);
	au_h_open_post(src_dentry, a->bsrc, h_file);
	au_unpin(&a->pin);

out:
	di_read_unlock(a->src_parent, AuLock_IR);
	return err;
}

static int au_cpup_or_link(struct dentry *src_dentry, struct au_link_args *a)
{
	int err;
	unsigned char plink;
	struct inode *h_inode, *inode;
	struct dentry *h_src_dentry;
	struct super_block *sb;
	struct file *h_file;

	plink = 0;
	h_inode = NULL;
	sb = src_dentry->d_sb;
	inode = src_dentry->d_inode;
	if (au_ibstart(inode) <= a->bdst)
		h_inode = au_h_iptr(inode, a->bdst);
	if (!h_inode || !h_inode->i_nlink) {
		/* copyup src_dentry as the name of dentry. */
		au_set_dbstart(src_dentry, a->bdst);
		au_set_h_dptr(src_dentry, a->bdst, dget(a->h_path.dentry));
		h_inode = au_h_dptr(src_dentry, a->bsrc)->d_inode;
		mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
		h_file = au_h_open_pre(src_dentry, a->bsrc);
		if (IS_ERR(h_file)) {
			err = PTR_ERR(h_file);
			h_file = NULL;
		} else
			err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc,
						 -1, AuCpup_KEEPLINO,
						 a->parent);
		mutex_unlock(&h_inode->i_mutex);
		au_h_open_post(src_dentry, a->bsrc, h_file);
		au_set_h_dptr(src_dentry, a->bdst, NULL);
		au_set_dbstart(src_dentry, a->bsrc);
	} else {
		/* the inode of src_dentry already exists on a.bdst branch */
		h_src_dentry = d_find_alias(h_inode);
		if (!h_src_dentry && au_plink_test(inode)) {
			plink = 1;
			h_src_dentry = au_plink_lkup(inode, a->bdst);
			err = PTR_ERR(h_src_dentry);
			if (IS_ERR(h_src_dentry))
				goto out;

			if (unlikely(!h_src_dentry->d_inode)) {
				dput(h_src_dentry);
				h_src_dentry = NULL;
			}

		}
		if (h_src_dentry) {
			err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
					 &a->h_path);
			dput(h_src_dentry);
		} else {
			AuIOErr("no dentry found for hi%lu on b%d\n",
				h_inode->i_ino, a->bdst);
			err = -EIO;
		}
	}

	if (!err && !plink)
		au_plink_append(inode, a->bdst, a->h_path.dentry);

out:
	AuTraceErr(err);
	return err;
}
Ejemplo n.º 2
0
__be32
nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
		   const char *name, unsigned int len,
		   struct svc_export **exp_ret, struct dentry **dentry_ret)
{
	struct svc_export	*exp;
	struct dentry		*dparent;
	struct dentry		*dentry;
	__be32			err;
	int			host_err;

	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);

	/* Obtain dentry and export. */
	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
	if (err)
		return err;

	dparent = fhp->fh_dentry;
	exp  = fhp->fh_export;
	exp_get(exp);

	/* Lookup the name, but don't follow links */
	if (isdotent(name, len)) {
		if (len==1)
			dentry = dget(dparent);
		else if (dparent != exp->ex_path.dentry)
			dentry = dget_parent(dparent);
		else if (!EX_NOHIDE(exp))
			dentry = dget(dparent); /* .. == . just like at / */
		else {
			/* checking mountpoint crossing is very different when stepping up */
			struct svc_export *exp2 = NULL;
			struct dentry *dp;
			struct vfsmount *mnt = mntget(exp->ex_path.mnt);
			dentry = dget(dparent);
			while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
				;
			dp = dget_parent(dentry);
			dput(dentry);
			dentry = dp;

			exp2 = rqst_exp_parent(rqstp, mnt, dentry);
			if (PTR_ERR(exp2) == -ENOENT) {
				dput(dentry);
				dentry = dget(dparent);
			} else if (IS_ERR(exp2)) {
				host_err = PTR_ERR(exp2);
				dput(dentry);
				mntput(mnt);
				goto out_nfserr;
			} else {
				exp_put(exp);
				exp = exp2;
			}
			mntput(mnt);
		}
	} else {
		fh_lock(fhp);
		dentry = lookup_one_len(name, dparent, len);
		host_err = PTR_ERR(dentry);
		if (IS_ERR(dentry))
			goto out_nfserr;
		/*
		 * check if we have crossed a mount point ...
		 */
		if (d_mountpoint(dentry)) {
			if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
				dput(dentry);
				goto out_nfserr;
			}
		}
	}
	*dentry_ret = dentry;
	*exp_ret = exp;
	return 0;

out_nfserr:
	exp_put(exp);
	return nfserrno(host_err);
}
Ejemplo n.º 3
0
/**
 * securityfs_create_file - create a file in the securityfs filesystem
 *
 * @name: a pointer to a string containing the name of the file to create.
 * @mode: the permission that the file should have
 * @parent: a pointer to the parent dentry for this file.  This should be a
 *          directory dentry if set.  If this parameter is %NULL, then the
 *          file will be created in the root of the securityfs filesystem.
 * @data: a pointer to something that the caller will want to get to later
 *        on.  The inode.i_private pointer will point to this value on
 *        the open() call.
 * @fops: a pointer to a struct file_operations that should be used for
 *        this file.
 *
 * This is the basic "create a file" function for securityfs.  It allows for a
 * wide range of flexibility in creating a file, or a directory (if you
 * want to create a directory, the securityfs_create_dir() function is
 * recommended to be used instead).
 *
 * This function returns a pointer to a dentry if it succeeds.  This
 * pointer must be passed to the securityfs_remove() function when the file is
 * to be removed (no automatic cleanup happens if your module is unloaded,
 * you are responsible here).  If an error occurs, the function will return
 * the error value (via ERR_PTR).
 *
 * If securityfs is not enabled in the kernel, the value %-ENODEV is
 * returned.
 */
struct dentry *securityfs_create_file(const char *name, umode_t mode,
				   struct dentry *parent, void *data,
				   const struct file_operations *fops)
{
	struct dentry *dentry;
	int is_dir = S_ISDIR(mode);
	struct inode *dir, *inode;
	int error;

	if (!is_dir) {
		BUG_ON(!fops);
		mode = (mode & S_IALLUGO) | S_IFREG;
	}

	pr_debug("securityfs: creating file '%s'\n",name);

	error = simple_pin_fs(&fs_type, &mount, &mount_count);
	if (error)
		return ERR_PTR(error);

	if (!parent)
		parent = mount->mnt_root;

	dir = d_inode(parent);

	inode_lock(dir);
	dentry = lookup_one_len(name, parent, strlen(name));
	if (IS_ERR(dentry))
		goto out;

	if (d_really_is_positive(dentry)) {
		error = -EEXIST;
		goto out1;
	}

	inode = new_inode(dir->i_sb);
	if (!inode) {
		error = -ENOMEM;
		goto out1;
	}

	inode->i_ino = get_next_ino();
	inode->i_mode = mode;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	inode->i_private = data;
	if (is_dir) {
		inode->i_op = &simple_dir_inode_operations;
		inode->i_fop = &simple_dir_operations;
		inc_nlink(inode);
		inc_nlink(dir);
	} else {
		inode->i_fop = fops;
	}
	d_instantiate(dentry, inode);
	dget(dentry);
	inode_unlock(dir);
	return dentry;

out1:
	dput(dentry);
	dentry = ERR_PTR(error);
out:
	inode_unlock(dir);
	simple_release_fs(&mount, &mount_count);
	return dentry;
}
Ejemplo n.º 4
0
/* cr_mknod - based on linux/fs/namei.c:sys_mknod
 *
 * Creates regular files or fifos (no devices) making them anonymous (unlinked)
 * if desired.
 * Returns a dentry for the resulting filesystem objects, and the corresponding
 * vfsmnt can be obtained in nd->mnt.  Together these two can be passed
 * to dentry_open() or cr_dentry_open(), even for an unlinked inode.
 * In the event of an error, no dput() or cr_path_release() is required,
 * otherwise they are.
 *
 * In the event that an object exists with the given name, it will be
 * check for the proper mode prior to return, yielding -EEXIST on conflict.
 */
struct dentry *
cr_mknod(cr_errbuf_t *eb, struct nameidata *nd, const char *name, int mode, unsigned long unlinked_id)
{
    struct dentry * dentry;
    int err;

    if (unlinked_id) {
	/* Generate a replacement name which we will use instead of the original one. */
	name = cr_anonymous_rename(eb, name, unlinked_id);
	if (!name) {
	    CR_ERR_EB(eb, "cr_mknod - failed to rename unlinked object");
	    err = -ENOMEM;
	    goto out;
	}
    }

    /* Prior to 2.6.26, lookup_create() would return an exisiting dentry.
     * Since 2.6.26, it returns -EEXIST if the dentry exists.  So, we first
     * check for an existing dentry.  For older kernels this is not required,
     * but is still correct.
     */
    err = path_lookup(name, LOOKUP_FOLLOW, nd);
    if (!err) {
	dentry = dget(nd->nd_dentry);
	err = -EEXIST; /* Forces mode validation below */
	goto have_it;
    }

    err = path_lookup(name, LOOKUP_PARENT, nd);
    if (err) {
	CR_KTRACE_UNEXPECTED("Couldn't path_lookup for mknod %s.  err=%d.", name, err);
	goto out_free;
    }

    dentry = cr_lookup_create(nd, 0);
    if (IS_ERR(dentry)) {
	err = PTR_ERR(dentry);
	CR_KTRACE_UNEXPECTED("Couldn't lookup_create for mknod %s.  err=%d.", name, err);
	goto out_release;
    }

    switch (mode & S_IFMT) {
    case S_IFREG:
	err = vfs_create(nd->nd_dentry->d_inode, dentry, mode, nd);
	break;
    case S_IFIFO:
	err = cr_vfs_mknod(nd->nd_dentry->d_inode, dentry, nd->nd_mnt, mode, 0 /* ignored */);
	break;
    default:
	CR_ERR_EB(eb, "Unknown/invalid type %d passed to cr_mknod %s.", (mode&S_IFMT), name);
	err = -EINVAL;
    }
    if (unlinked_id && !err) { /* Note that we don't unlink if we failed to create */
	dget(dentry);	/* ensure unlink doesn't destroy the dentry */
	/* Note possibility of silent failure here: */
	(void)cr_vfs_unlink(nd->nd_dentry->d_inode, dentry, nd->nd_mnt);
	dput(dentry);
    }
    cr_inode_unlock(nd->nd_dentry->d_inode);

have_it:
    if ((err == -EEXIST) && !((dentry->d_inode->i_mode ^ mode) & S_IFMT)) {
	/* We fall through and return the dentry */
    } else if (err) {
	CR_KTRACE_UNEXPECTED("Couldn't cr_mknod %s.  err=%d.", name, err);
	goto out_put;
    }

    if (unlinked_id) {
	__putname(name);
    }
    return dentry;

out_put:
    dput(dentry);
out_release:
    cr_path_release(nd);
out_free:
    if (unlinked_id) {
	__putname(name);
    }
out:
    return (struct dentry *)ERR_PTR(err);
}
Ejemplo n.º 5
0
/*
 * when an error happened, remove the created whiteout and revert everything.
 */
static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex,
		     aufs_bindex_t bwh, struct dentry *wh_dentry,
		     struct dentry *dentry, struct au_dtime *dt)
{
	int rerr;
	struct path h_path = {
		.dentry	= wh_dentry,
		.mnt	= au_sbr_mnt(dir->i_sb, bindex)
	};

	rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry);
	if (!rerr) {
		au_set_dbwh(dentry, bwh);
		au_dtime_revert(dt);
		return 0;
	}

	AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
		AuDLNPair(dentry), err, rerr);
	return -EIO;
}

/* ---------------------------------------------------------------------- */

int aufs_unlink(struct inode *dir, struct dentry *dentry)
{
	int err;
	aufs_bindex_t bwh, bindex, bstart;
	struct au_dtime dt;
	struct au_pin pin;
	struct path h_path;
	struct inode *inode, *h_dir;
	struct dentry *parent, *wh_dentry;

	IMustLock(dir);

	err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
	if (unlikely(err))
		goto out;
	err = au_d_hashed_positive(dentry);
	if (unlikely(err))
		goto out_unlock;
	inode = dentry->d_inode;
	IMustLock(inode);
	err = -EISDIR;
	if (unlikely(S_ISDIR(inode->i_mode)))
		goto out_unlock; /* possible? */

	bstart = au_dbstart(dentry);
	bwh = au_dbwh(dentry);
	bindex = -1;
	parent = dentry->d_parent; /* dir inode is locked */
	di_write_lock_parent(parent);
	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt, &pin);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
	h_path.dentry = au_h_dptr(dentry, bstart);
	dget(h_path.dentry);
	if (bindex == bstart) {
		h_dir = au_pinned_h_dir(&pin);
		err = vfsub_unlink(h_dir, &h_path, /*force*/0);
	} else {
		/* dir inode is locked */
		h_dir = wh_dentry->d_parent->d_inode;
		IMustLock(h_dir);
		err = 0;
	}

	if (!err) {
		vfsub_drop_nlink(inode);
		epilog(dir, dentry, bindex);

		/* update target timestamps */
		if (bindex == bstart) {
			vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
			inode->i_ctime = h_path.dentry->d_inode->i_ctime;
		} else
			/* todo: this timestamp may be reverted later */
			inode->i_ctime = h_dir->i_ctime;
		goto out_unpin; /* success */
	}

	/* revert */
	if (wh_dentry) {
		int rerr;

		rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt);
		if (rerr)
			err = rerr;
	}

out_unpin:
	au_unpin(&pin);
	dput(wh_dentry);
	dput(h_path.dentry);
out_parent:
	di_write_unlock(parent);
out_unlock:
	aufs_read_unlock(dentry, AuLock_DW);
out:
	return err;
}
Ejemplo n.º 6
0
/*
 * Do a lookup + open with a single request.  If we get a non-existent
 * file or symlink, return 1 so the VFS can retry.
 */
int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
		     struct file *file, unsigned flags, umode_t mode,
		     int *opened)
{
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
	struct ceph_mds_request *req;
	struct dentry *dn;
	int err;

	dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
	     dir, dentry, dentry->d_name.len, dentry->d_name.name,
	     d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);

	if (dentry->d_name.len > NAME_MAX)
		return -ENAMETOOLONG;

	err = ceph_init_dentry(dentry);
	if (err < 0)
		return err;

	/* do the open */
	req = prepare_open_request(dir->i_sb, flags, mode);
	if (IS_ERR(req))
		return PTR_ERR(req);
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	if (flags & O_CREAT) {
		req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
		req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	}
	req->r_locked_dir = dir;           /* caller holds dir->i_mutex */
	err = ceph_mdsc_do_request(mdsc,
				   (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
				   req);
	if (err)
		goto out_err;

	err = ceph_handle_snapdir(req, dentry, err);
	if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
		err = ceph_handle_notrace_create(dir, dentry);

	if (d_unhashed(dentry)) {
		dn = ceph_finish_lookup(req, dentry, err);
		if (IS_ERR(dn))
			err = PTR_ERR(dn);
	} else {
		/* we were given a hashed negative dentry */
		dn = NULL;
	}
	if (err)
		goto out_err;
	if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
		/* make vfs retry on splice, ENOENT, or symlink */
		dout("atomic_open finish_no_open on dn %p\n", dn);
		err = finish_no_open(file, dn);
	} else {
		dout("atomic_open finish_open on dn %p\n", dn);
		if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
			*opened |= FILE_CREATED;
		}
		err = finish_open(file, dentry, ceph_open, opened);
	}

out_err:
	ceph_mdsc_put_request(req);
	dout("atomic_open result=%d\n", err);
	return err;
}
Ejemplo n.º 7
0
Archivo: hooks.c Proyecto: vicvinc/Bsec
/* The inode's security attributes must be initialized before first use. */
static int inode_doinit_with_dentry(struct inode *inode,
				struct dentry *opt_dentry)
{
	struct inode_security_struct *isec = inode->i_security;
	struct dentry *dentry;
	char *context = NULL;
	unsigned len = 0;
	int rc = 0;

	if (isec && isec->initialized)
		return rc;

	mutex_lock(&isec->lock);
	if (!inode->i_op->getxattr) {
		/* no getxattr iop, so init */
		pr_debug("no xattr iop when init\n");
		isec->task_sid = current_uid();
		init_mlevel(&isec->mlevel);
		isec->ilevel.level_value = 0;
		goto out;
	}

	/* Need a dentry, since the xattr API requires one.
	   Life would be simpler if we could just pass the inode. */
	if (opt_dentry)
		/* Called from d_instantiate or d_splice_alias. */
		dentry = dget(opt_dentry);
	if (!dentry) {
		/*
		 * this is can be hit on boot when a file is accessed
		 * inode_doinit with a dentry, before these inodes could
		 * be used again by userspace.
		 */
		goto out;
	}

	/* Query for the right size. */
	rc = inode->i_op->getxattr(dentry, XATTR_NAME_KSE,
				   NULL, 0);
	if (rc < 0) {
		dput(dentry);
		goto out;
	}

	len = rc;
	context = kmalloc(len+1, GFP_NOFS);
	if (!context) {
		rc = -ENOMEM;
		dput(dentry);
		goto out;
	}
	context[len] = '\0';
	rc = inode->i_op->getxattr(dentry, XATTR_NAME_KSE,
				   context, len);
	if (rc == -ERANGE) {
		kfree(context);

		/* Need a larger buffer.  Query for the right size. */
		rc = inode->i_op->getxattr(dentry, XATTR_NAME_KSE,
					   NULL, 0);
		if (rc < 0) {
			dput(dentry);
			goto out;
		}
		len = rc;
		context = kmalloc(len+1, GFP_NOFS);
		if (!context) {
			rc = -ENOMEM;
			dput(dentry);
			goto out;
		}
		context[len] = '\0';
		rc = inode->i_op->getxattr(dentry,
					   XATTR_NAME_KSE,
					   context, len);
	}
	dput(dentry);
	if (rc < 0) {
		if (rc != -ENODATA) {
			printk(KERN_INFO "KUXSE: %s:  getxattr returned "
				"%d for dev=%s ino=%ld\n", __func__,
				-rc, inode->i_sb->s_id, inode->i_ino);
			kfree(context);
			goto out;
		}
		/* NODATA just init */
		rc = 0; 
		pr_debug("no xattr data when init\n");
		isec->task_sid = current_uid();
		init_mlevel(&isec->mlevel);
		isec->ilevel.level_value = 0;
	} else {
		/* getxattr succeeded */
		ssize_t sclen = strlen(context);
		rc = context_to_iss(&isec->mlevel, &isec->ilevel,
				(const void **)&context, &sclen);
		if (rc) {
			printk(KERN_INFO "KUXSE:  unable to map value '%s' "
				"to context for (%s, %lu), rc=%d, size=%ld\n",
				(char *)context, inode->i_sb->s_id,
				inode->i_ino, -rc, sclen);
			dump_stack();
			return rc;
		}
	}
	kfree(context);

	isec->initialized = 1;
out:
	mutex_unlock(&isec->lock);
	return rc;
}
Ejemplo n.º 8
0
/*
 * Find an eligible tree to time-out
 * A tree is eligible if :-
 *  - it is unused by any user process
 *  - it has been unused for exp_timeout time
 */
static struct dentry *autofs4_expire_indirect(struct super_block *sb,
					      struct vfsmount *mnt,
					      struct autofs_sb_info *sbi,
					      int how)
{
	unsigned long timeout;
	struct dentry *root = sb->s_root;
	struct dentry *expired = NULL;
	struct list_head *next;
	int do_now = how & AUTOFS_EXP_IMMEDIATE;
	int exp_leaves = how & AUTOFS_EXP_LEAVES;

	if (!root)
		return NULL;

	now = jiffies;
	timeout = sbi->exp_timeout;

	spin_lock(&dcache_lock);
	next = root->d_subdirs.next;

	/* On exit from the loop expire is set to a dgot dentry
	 * to expire or it's NULL */
	while ( next != &root->d_subdirs ) {
		struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);

		/* Negative dentry - give up */
		if (!simple_positive(dentry)) {
			next = next->next;
			continue;
		}

		dentry = dget(dentry);
		spin_unlock(&dcache_lock);

		/*
		 * Case 1: (i) indirect mount or top level pseudo direct mount
		 *	   (autofs-4.1).
		 *	   (ii) indirect mount with offset mount, check the "/"
		 *	   offset (autofs-5.0+).
		 */
		if (d_mountpoint(dentry)) {
			DPRINTK("checking mountpoint %p %.*s",
				dentry, (int)dentry->d_name.len, dentry->d_name.name);

			/* Can we umount this guy */
			if (autofs4_mount_busy(mnt, dentry))
				goto next;

			/* Can we expire this guy */
			if (autofs4_can_expire(dentry, timeout, do_now)) {
				expired = dentry;
				break;
			}
			goto next;
		}

		if (simple_empty(dentry))
			goto next;

		/* Case 2: tree mount, expire iff entire tree is not busy */
		if (!exp_leaves) {
			/* Lock the tree as we must expire as a whole */
			spin_lock(&sbi->fs_lock);
			if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) {
				struct autofs_info *inf = autofs4_dentry_ino(dentry);

				/* Set this flag early to catch sys_chdir and the like */
				inf->flags |= AUTOFS_INF_EXPIRING;
				spin_unlock(&sbi->fs_lock);
				expired = dentry;
				break;
			}
			spin_unlock(&sbi->fs_lock);
		/*
		 * Case 3: pseudo direct mount, expire individual leaves
		 *	   (autofs-4.1).
		 */
		} else {
			expired = autofs4_check_leaves(mnt, dentry, timeout, do_now);
			if (expired) {
				dput(dentry);
				break;
			}
		}
next:
		dput(dentry);
		spin_lock(&dcache_lock);
		next = next->next;
	}

	if (expired) {
		DPRINTK("returning %p %.*s",
			expired, (int)expired->d_name.len, expired->d_name.name);
		spin_lock(&dcache_lock);
		list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child);
		spin_unlock(&dcache_lock);
		return expired;
	}
	spin_unlock(&dcache_lock);

	return NULL;
}
Ejemplo n.º 9
0
int ovl_permission(struct inode *inode, int mask)
{
	struct ovl_entry *oe;
	struct dentry *alias = NULL;
	struct inode *realinode;
	struct dentry *realdentry;
	bool is_upper;
	int err;

	if (S_ISDIR(inode->i_mode)) {
		oe = inode->i_private;
	} else if (mask & MAY_NOT_BLOCK) {
		return -ECHILD;
	} else {
		/*
		 * For non-directories find an alias and get the info
		 * from there.
		 */
		spin_lock(&inode->i_lock);
		if (WARN_ON(list_empty(&inode->i_dentry))) {
			spin_unlock(&inode->i_lock);
			return -ENOENT;
		}
		alias = list_entry(inode->i_dentry.next,
				   struct dentry, d_u.d_alias);
		dget(alias);
		spin_unlock(&inode->i_lock);
		oe = alias->d_fsdata;
	}

	realdentry = ovl_entry_real(oe, &is_upper);

	/* Careful in RCU walk mode */
	realinode = ACCESS_ONCE(realdentry->d_inode);
	if (!realinode) {
		WARN_ON(!(mask & MAY_NOT_BLOCK));
		err = -ENOENT;
		goto out_dput;
	}

	if (mask & MAY_WRITE) {
		umode_t mode = realinode->i_mode;

		/*
		 * Writes will always be redirected to upper layer, so
		 * ignore lower layer being read-only.
		 *
		 * If the overlay itself is read-only then proceed
		 * with the permission check, don't return EROFS.
		 * This will only happen if this is the lower layer of
		 * another overlayfs.
		 *
		 * If upper fs becomes read-only after the overlay was
		 * constructed return EROFS to prevent modification of
		 * upper layer.
		 */
		err = -EROFS;
		if (is_upper && !IS_RDONLY(inode) && IS_RDONLY(realinode) &&
		    (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
			goto out_dput;
	}

	err = inode_only_permission(realinode, mask);
out_dput:
	dput(alias);
	return err;
}
Ejemplo n.º 10
0
static inline void copy_namei(struct nameidata *dest, const struct nameidata *src) {
	mntget(src->mnt);  dget(src->dentry);
	*dest = *src;
}
Ejemplo n.º 11
0
/* Check a directory tree of mount points for busyness
 * The tree is not busy iff no mountpoints are busy
 */
static int autofs4_tree_busy(struct vfsmount *mnt,
	       		     struct dentry *top,
			     unsigned long timeout,
			     int do_now)
{
	struct autofs_info *top_ino = autofs4_dentry_ino(top);
	struct dentry *p;

	DPRINTK("top %p %.*s",
		top, (int)top->d_name.len, top->d_name.name);

	/* Negative dentry - give up */
	if (!simple_positive(top))
		return 1;

	spin_lock(&dcache_lock);
	for (p = top; p; p = next_dentry(p, top)) {
		/* Negative dentry - give up */
		if (!simple_positive(p))
			continue;

		DPRINTK("dentry %p %.*s",
			p, (int) p->d_name.len, p->d_name.name);

		p = dget(p);
		spin_unlock(&dcache_lock);

		/*
		 * Is someone visiting anywhere in the subtree ?
		 * If there's no mount we need to check the usage
		 * count for the autofs dentry.
		 * If the fs is busy update the expiry counter.
		 */
		if (d_mountpoint(p)) {
			if (autofs4_mount_busy(mnt, p)) {
				top_ino->last_used = jiffies;
				dput(p);
				return 1;
			}
		} else {
			struct autofs_info *ino = autofs4_dentry_ino(p);
			unsigned int ino_count = atomic_read(&ino->count);

			/*
			 * Clean stale dentries below that have not been
			 * invalidated after a mount fail during lookup
			 */
			d_invalidate(p);

			/* allow for dget above and top is already dgot */
			if (p == top)
				ino_count += 2;
			else
				ino_count++;

			if (atomic_read(&p->d_count) > ino_count) {
				top_ino->last_used = jiffies;
				dput(p);
				return 1;
			}
		}
		dput(p);
		spin_lock(&dcache_lock);
	}
	spin_unlock(&dcache_lock);

	/* Timeout of a tree mount is ultimately determined by its top dentry */
	if (!autofs4_can_expire(top, timeout, do_now))
		return 1;

	return 0;
}
Ejemplo n.º 12
0
void redirect_namei(struct nameidata *dest, const struct nameidata *src) {
	mntget(src->mnt);  dget(src->dentry);
	mntput(dest->mnt); dput(dest->dentry);
	*dest = *src;
}
Ejemplo n.º 13
0
static int ovl_fill_super(struct super_block *sb, void *data, int silent)
{
	struct path lowerpath;
	struct path upperpath;
	struct path workpath;
	struct inode *root_inode;
	struct dentry *root_dentry;
	struct ovl_entry *oe;
	struct ovl_fs *ufs;
	struct kstatfs statfs;
	int err;

	err = -ENOMEM;
	ufs = kmalloc(sizeof(struct ovl_fs), GFP_KERNEL);
	if (!ufs)
		goto out;

	err = ovl_parse_opt((char *) data, &ufs->config);
	if (err)
		goto out_free_ufs;

	/* FIXME: workdir is not needed for a R/O mount */
	err = -EINVAL;
	if (!ufs->config.upperdir || !ufs->config.lowerdir ||
	    !ufs->config.workdir) {
		pr_err("overlayfs: missing upperdir or lowerdir or workdir\n");
		goto out_free_config;
	}

	oe = ovl_alloc_entry();
	if (oe == NULL)
		goto out_free_config;

	err = ovl_mount_dir(ufs->config.upperdir, &upperpath);
	if (err)
		goto out_free_oe;

	err = ovl_mount_dir(ufs->config.lowerdir, &lowerpath);
	if (err)
		goto out_put_upperpath;

	err = ovl_mount_dir(ufs->config.workdir, &workpath);
	if (err)
		goto out_put_lowerpath;

	err = -EINVAL;
	if (!S_ISDIR(upperpath.dentry->d_inode->i_mode) ||
	    !S_ISDIR(lowerpath.dentry->d_inode->i_mode) ||
	    !S_ISDIR(workpath.dentry->d_inode->i_mode)) {
		pr_err("overlayfs: upperdir or lowerdir or workdir not a directory\n");
		goto out_put_workpath;
	}

	if (upperpath.mnt != workpath.mnt) {
		pr_err("overlayfs: workdir and upperdir must reside under the same mount\n");
		goto out_put_workpath;
	}
	if (upperpath.dentry == workpath.dentry ||
	    d_ancestor(upperpath.dentry, workpath.dentry) ||
	    d_ancestor(workpath.dentry, upperpath.dentry)) {
		pr_err("overlayfs: workdir and upperdir must be separate subtrees\n");
		goto out_put_workpath;
	}

	err = vfs_statfs(&lowerpath, &statfs);
	if (err) {
		pr_err("overlayfs: statfs failed on lowerpath\n");
		goto out_put_workpath;
	}
	ufs->lower_namelen = statfs.f_namelen;

	sb->s_stack_depth = max(upperpath.mnt->mnt_sb->s_stack_depth,
				lowerpath.mnt->mnt_sb->s_stack_depth) + 1;

	err = -EINVAL;
	if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
		pr_err("overlayfs: maximum fs stacking depth exceeded\n");
		goto out_put_lowerpath;
	}


	ufs->upper_mnt = clone_private_mount(&upperpath);
	err = PTR_ERR(ufs->upper_mnt);
	if (IS_ERR(ufs->upper_mnt)) {
		pr_err("overlayfs: failed to clone upperpath\n");
		goto out_put_workpath;
	}

	ufs->lower_mnt = clone_private_mount(&lowerpath);
	err = PTR_ERR(ufs->lower_mnt);
	if (IS_ERR(ufs->lower_mnt)) {
		pr_err("overlayfs: failed to clone lowerpath\n");
		goto out_put_upper_mnt;
	}

	ufs->workdir = ovl_workdir_create(ufs->upper_mnt, workpath.dentry);
	err = PTR_ERR(ufs->workdir);
	if (IS_ERR(ufs->workdir)) {
		pr_err("overlayfs: failed to create directory %s/%s\n",
		       ufs->config.workdir, OVL_WORKDIR_NAME);
		goto out_put_lower_mnt;
	}

	/*
	 * Make lower_mnt R/O.  That way fchmod/fchown on lower file
	 * will fail instead of modifying lower fs.
	 */
	ufs->lower_mnt->mnt_flags |= MNT_READONLY;

	/* If the upper fs is r/o, we mark overlayfs r/o too */
	if (ufs->upper_mnt->mnt_sb->s_flags & MS_RDONLY)
		sb->s_flags |= MS_RDONLY;

	err = -ENOMEM;
	root_inode = ovl_new_inode(sb, S_IFDIR, oe);
	if (!root_inode)
		goto out_put_workdir;

	root_dentry = d_make_root(root_inode);
	if (!root_dentry)
		goto out_put_workdir;

	mntput(upperpath.mnt);
	mntput(lowerpath.mnt);
	path_put(&workpath);

	oe->__upperdentry = dget(upperpath.dentry);
	oe->lowerdentry = lowerpath.dentry;

	root_dentry->d_fsdata = oe;
	root_dentry->d_op = &ovl_dentry_operations;

	sb->s_magic = OVERLAYFS_SUPER_MAGIC;
	sb->s_op = &ovl_super_operations;
	sb->s_root = root_dentry;
	sb->s_fs_info = ufs;

	return 0;

out_put_workdir:
	dput(ufs->workdir);
out_put_lower_mnt:
	mntput(ufs->lower_mnt);
out_put_upper_mnt:
	mntput(ufs->upper_mnt);
out_put_workpath:
	path_put(&workpath);
out_put_lowerpath:
	path_put(&lowerpath);
out_put_upperpath:
	path_put(&upperpath);
out_free_oe:
	kfree(oe);
out_free_config:
	kfree(ufs->config.lowerdir);
	kfree(ufs->config.upperdir);
	kfree(ufs->config.workdir);
out_free_ufs:
	kfree(ufs);
out:
	return err;
}
Ejemplo n.º 14
0
static int ovl_do_lookup(struct dentry *dentry)
{
	struct ovl_entry *oe;
	struct dentry *upperdir;
	struct dentry *lowerdir;
	struct dentry *upperdentry = NULL;
	struct dentry *lowerdentry = NULL;
	struct inode *inode = NULL;
	int err;

	err = -ENOMEM;
	oe = ovl_alloc_entry();
	if (!oe)
		goto out;

	upperdir = ovl_dentry_upper(dentry->d_parent);
	lowerdir = ovl_dentry_lower(dentry->d_parent);

	if (upperdir) {
		upperdentry = ovl_lookup_real(upperdir, &dentry->d_name);
		err = PTR_ERR(upperdentry);
		if (IS_ERR(upperdentry))
			goto out_put_dir;

		if (lowerdir && upperdentry) {
			if (ovl_is_whiteout(upperdentry)) {
				dput(upperdentry);
				upperdentry = NULL;
				oe->opaque = true;
			} else if (ovl_is_opaquedir(upperdentry)) {
				oe->opaque = true;
			}
		}
	}
	if (lowerdir && !oe->opaque) {
		lowerdentry = ovl_lookup_real(lowerdir, &dentry->d_name);
		err = PTR_ERR(lowerdentry);
		if (IS_ERR(lowerdentry))
			goto out_dput_upper;
	}

	if (lowerdentry && upperdentry &&
	    (!S_ISDIR(upperdentry->d_inode->i_mode) ||
	     !S_ISDIR(lowerdentry->d_inode->i_mode))) {
		dput(lowerdentry);
		lowerdentry = NULL;
		oe->opaque = true;
	}

	if (lowerdentry || upperdentry) {
		struct dentry *realdentry;

		realdentry = upperdentry ? upperdentry : lowerdentry;
		err = -ENOMEM;
		inode = ovl_new_inode(dentry->d_sb, realdentry->d_inode->i_mode,
				      oe);
		if (!inode)
			goto out_dput;
		ovl_copyattr(realdentry->d_inode, inode);
	}

	if (upperdentry)
		oe->__upperdentry = dget(upperdentry);

	if (lowerdentry)
		oe->lowerdentry = lowerdentry;

	dentry->d_fsdata = oe;
	dentry->d_op = &ovl_dentry_operations;
	d_add(dentry, inode);

	return 0;

out_dput:
	dput(lowerdentry);
out_dput_upper:
	dput(upperdentry);
out_put_dir:
	kfree(oe);
out:
	return err;
}
Ejemplo n.º 15
0
/* Is a directory logically empty? */
int check_empty(struct dentry *dentry, struct dentry *parent,
		struct unionfs_dir_state **namelist)
{
	int err = 0;
	struct dentry *lower_dentry = NULL;
	struct vfsmount *mnt;
	struct super_block *sb;
	struct file *lower_file;
	struct unionfs_rdutil_callback *buf = NULL;
	int bindex, bstart, bend, bopaque;

	sb = dentry->d_sb;


	BUG_ON(!S_ISDIR(dentry->d_inode->i_mode));

	err = unionfs_partial_lookup(dentry, parent);
	if (err)
		goto out;

	bstart = dbstart(dentry);
	bend = dbend(dentry);
	bopaque = dbopaque(dentry);
	if (0 <= bopaque && bopaque < bend)
		bend = bopaque;

	buf = kmalloc(sizeof(struct unionfs_rdutil_callback), GFP_KERNEL);
	if (unlikely(!buf)) {
		err = -ENOMEM;
		goto out;
	}
	buf->err = 0;
	buf->mode = RD_CHECK_EMPTY;
	buf->rdstate = alloc_rdstate(dentry->d_inode, bstart);
	if (unlikely(!buf->rdstate)) {
		err = -ENOMEM;
		goto out;
	}

	/* Process the lower directories with rdutil_callback as a filldir. */
	for (bindex = bstart; bindex <= bend; bindex++) {
		lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
		if (!lower_dentry)
			continue;
		if (!lower_dentry->d_inode)
			continue;
		if (!S_ISDIR(lower_dentry->d_inode->i_mode))
			continue;

		dget(lower_dentry);
		mnt = unionfs_mntget(dentry, bindex);
		branchget(sb, bindex);
		lower_file = dentry_open(lower_dentry, mnt, O_RDONLY);
		if (IS_ERR(lower_file)) {
			err = PTR_ERR(lower_file);
			branchput(sb, bindex);
			goto out;
		}

		do {
			buf->filldir_called = 0;
			buf->rdstate->bindex = bindex;
			err = vfs_readdir(lower_file,
					  readdir_util_callback, buf);
			if (buf->err)
				err = buf->err;
		} while ((err >= 0) && buf->filldir_called);

		/* fput calls dput for lower_dentry */
		fput(lower_file);
		branchput(sb, bindex);

		if (err < 0)
			goto out;
	}

out:
	if (buf) {
		if (namelist && !err)
			*namelist = buf->rdstate;
		else if (buf->rdstate)
			free_rdstate(buf->rdstate);
		kfree(buf);
	}


	return err;
}
Ejemplo n.º 16
0
/*
 * By adding a dirty branch, a cached dentry may be affected in various ways.
 *
 * a dirty branch is added
 * - on the top of layers
 * - in the middle of layers
 * - to the bottom of layers
 *
 * on the added branch there exists
 * - a whiteout
 * - a diropq
 * - a same named entry
 *   + exist
 *     * negative --> positive
 *     * positive --> positive
 *	 - type is unchanged
 *	 - type is changed
 *   + doesn't exist
 *     * negative --> negative
 *     * positive --> negative (rejected by au_br_del() for non-dir case)
 * - none
 */
static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo,
			       struct au_dinfo *tmp)
{
	int err;
	aufs_bindex_t bindex, bend;
	struct {
		struct dentry *dentry;
		struct inode *inode;
		mode_t mode;
	} orig_h, tmp_h;
	struct au_hdentry *hd;
	struct inode *inode, *h_inode;
	struct dentry *h_dentry;

	err = 0;
	AuDebugOn(dinfo->di_bstart < 0);
	orig_h.dentry = dinfo->di_hdentry[dinfo->di_bstart].hd_dentry;
	orig_h.inode = orig_h.dentry->d_inode;
	orig_h.mode = 0;
	if (orig_h.inode)
		orig_h.mode = orig_h.inode->i_mode & S_IFMT;
	memset(&tmp_h, 0, sizeof(tmp_h));
	if (tmp->di_bstart >= 0) {
		tmp_h.dentry = tmp->di_hdentry[tmp->di_bstart].hd_dentry;
		tmp_h.inode = tmp_h.dentry->d_inode;
		if (tmp_h.inode)
			tmp_h.mode = tmp_h.inode->i_mode & S_IFMT;
	}

	inode = dentry->d_inode;
	if (!orig_h.inode) {
		AuDbg("nagative originally\n");
		if (inode) {
			au_hide(dentry);
			goto out;
		}
		AuDebugOn(inode);
		AuDebugOn(dinfo->di_bstart != dinfo->di_bend);
		AuDebugOn(dinfo->di_bdiropq != -1);

		if (!tmp_h.inode) {
			AuDbg("negative --> negative\n");
			/* should have only one negative lower */
			if (tmp->di_bstart >= 0
			    && tmp->di_bstart < dinfo->di_bstart) {
				AuDebugOn(tmp->di_bstart != tmp->di_bend);
				AuDebugOn(dinfo->di_bstart != dinfo->di_bend);
				au_set_h_dptr(dentry, dinfo->di_bstart, NULL);
				au_di_cp(dinfo, tmp);
				hd = tmp->di_hdentry + tmp->di_bstart;
				au_set_h_dptr(dentry, tmp->di_bstart,
					      dget(hd->hd_dentry));
			}
			au_dbg_verify_dinode(dentry);
		} else {
			AuDbg("negative --> positive\n");
			/*
			 * similar to the behaviour of creating with bypassing
			 * aufs.
			 * unhash it in order to force an error in the
			 * succeeding create operation.
			 * we should not set S_DEAD here.
			 */
			d_drop(dentry);
			/* au_di_swap(tmp, dinfo); */
			au_dbg_verify_dinode(dentry);
		}
	} else {
		AuDbg("positive originally\n");
		/* inode may be NULL */
		AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode);
		if (!tmp_h.inode) {
			AuDbg("positive --> negative\n");
			/* or bypassing aufs */
			au_hide(dentry);
			if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_bstart)
				dinfo->di_bwh = tmp->di_bwh;
			if (inode)
				err = au_refresh_hinode_self(inode);
			au_dbg_verify_dinode(dentry);
		} else if (orig_h.mode == tmp_h.mode) {
			AuDbg("positive --> positive, same type\n");
			if (!S_ISDIR(orig_h.mode)
			    && dinfo->di_bstart > tmp->di_bstart) {
				/*
				 * similar to the behaviour of removing and
				 * creating.
				 */
				au_hide(dentry);
				if (inode)
					err = au_refresh_hinode_self(inode);
				au_dbg_verify_dinode(dentry);
			} else {
				/* fill empty slots */
				if (dinfo->di_bstart > tmp->di_bstart)
					dinfo->di_bstart = tmp->di_bstart;
				if (dinfo->di_bend < tmp->di_bend)
					dinfo->di_bend = tmp->di_bend;
				dinfo->di_bwh = tmp->di_bwh;
				dinfo->di_bdiropq = tmp->di_bdiropq;
				hd = tmp->di_hdentry;
				bend = dinfo->di_bend;
				for (bindex = tmp->di_bstart; bindex <= bend;
				     bindex++) {
					if (au_h_dptr(dentry, bindex))
						continue;
					h_dentry = hd[bindex].hd_dentry;
					if (!h_dentry)
						continue;
					h_inode = h_dentry->d_inode;
					AuDebugOn(!h_inode);
					AuDebugOn(orig_h.mode
						  != (h_inode->i_mode
						      & S_IFMT));
					au_set_h_dptr(dentry, bindex,
						      dget(h_dentry));
				}
				err = au_refresh_hinode(inode, dentry);
				au_dbg_verify_dinode(dentry);
			}
		} else {
			AuDbg("positive --> positive, different type\n");
			/* similar to the behaviour of removing and creating */
			au_hide(dentry);
			if (inode)
				err = au_refresh_hinode_self(inode);
			au_dbg_verify_dinode(dentry);
		}
	}

out:
	return err;
}
Ejemplo n.º 17
0
static void*
cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
{
	struct dfs_info3_param *referrals = NULL;
	unsigned int num_referrals = 0;
	struct cifs_sb_info *cifs_sb;
	struct cifsSesInfo *ses;
	char *full_path = NULL;
	int xid, i;
	int rc = 0;
	struct vfsmount *mnt = ERR_PTR(-ENOENT);

	cFYI(1, ("in %s", __func__));
	BUG_ON(IS_ROOT(dentry));

	xid = GetXid();

	dput(nd->dentry);
	nd->dentry = dget(dentry);

	cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
	ses = cifs_sb->tcon->ses;

	if (!ses) {
		rc = -EINVAL;
		goto out_err;
	}

	/*
	 * The MSDFS spec states that paths in DFS referral requests and
	 * responses must be prefixed by a single '\' character instead of
	 * the double backslashes usually used in the UNC. This function
	 * gives us the latter, so we must adjust the result.
	 */
	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out_err;
	}

	rc = get_dfs_path(xid, ses , full_path + 1, cifs_sb->local_nls,
		&num_referrals, &referrals,
		cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);

	for (i = 0; i < num_referrals; i++) {
		int len;
		dump_referral(referrals+i);
		/* connect to a node */
		len = strlen(referrals[i].node_name);
		if (len < 2) {
			cERROR(1, ("%s: Net Address path too short: %s",
					__func__, referrals[i].node_name));
			rc = -EINVAL;
			goto out_err;
		}
		mnt = cifs_dfs_do_refmount(nd->mnt,
				nd->dentry, referrals + i);
		cFYI(1, ("%s: cifs_dfs_do_refmount:%s , mnt:%p", __func__,
					referrals[i].node_name, mnt));

		/* complete mount procedure if we accured submount */
		if (!IS_ERR(mnt))
			break;
	}

	/* we need it cause for() above could exit without valid submount */
	rc = PTR_ERR(mnt);
	if (IS_ERR(mnt))
		goto out_err;

	rc = add_mount_helper(mnt, nd, &cifs_dfs_automount_list);

out:
	FreeXid(xid);
	free_dfs_info_array(referrals, num_referrals);
	kfree(full_path);
	cFYI(1, ("leaving %s" , __func__));
	return ERR_PTR(rc);
out_err:
	path_release(nd);
	goto out;
}
Ejemplo n.º 18
0
/* create the sto dir, setup states */
int create_sto_dir(dentry_t *dentry, int mode)
{
	int err = 0;
	inode_t *dir;
	dentry_t *hidden_sto_dentry;
        dentry_t *hidden_sto_dir_dentry;

	/* had to take the "!S_ISDIR(mode))" check out, because it failed */
	if(exists_in_storage(dentry)) {
                printk(KERN_CRIT "mini_fo: create_sto_dir: wrong type or state.\\
n");
                err = -EINVAL;
                goto out;
        }

	err = get_neg_sto_dentry(dentry);
	if(err) {
		err = -EINVAL;
		goto out;
	}

	dir = dentry->d_parent->d_inode;
	hidden_sto_dentry = dtohd2(dentry);

	/* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);

	err = PTR_ERR(hidden_sto_dir_dentry);
	if (IS_ERR(hidden_sto_dir_dentry))
		goto out;

	err = vfs_mkdir(hidden_sto_dir_dentry->d_inode,
			hidden_sto_dentry,
			mode);
	if(err) {
		printk(KERN_CRIT "mini_fo: create_sto_dir: ERROR creating sto dir.\n");
		goto out_lock;
	}

	if(!dtohd2(dentry)->d_inode) {
		printk(KERN_CRIT "mini_fo: create_sto_dir: ERROR creating sto dir [2].\n");
		err = -EINVAL;
		goto out_lock;
	}

	/* interpose the new inode */
	if(dtost(dentry) == DELETED) {
		dtost(dentry) = DEL_REWRITTEN;
		err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
		if(err)
			goto out_lock;
	}
	else if(dtopd(dentry)->state == NON_EXISTANT) {
		dtopd(dentry)->state = CREATED;
		err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
		if(err)
			goto out_lock;
	}
	else if(dtopd(dentry)->state == UNMODIFIED) {
		dtopd(dentry)->state = MODIFIED;
		/* interpose on new inode */
		if(itohi2(dentry->d_inode) != NULL) {
			printk(KERN_CRIT "mini_fo:  create_sto_dir: ERROR, invalid inode detected.\n");
			err = -EINVAL;
			goto out_lock;
		}
		itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
	}

	fist_copy_attr_timesizes(dir, hidden_sto_dir_dentry->d_inode);

	/* initalize the wol list */
	itopd(dentry->d_inode)->deleted_list_size = -1;
	itopd(dentry->d_inode)->renamed_list_size = -1;
	meta_build_lists(dentry);


 out_lock:
	/* was: unlock_dir(hidden_sto_dir_dentry); */
	dput(hidden_sto_dir_dentry);
 out:
	return err;
}
static int do_rename(struct au_ren_args *a)
{
	int err;
	struct dentry *d, *h_d;

	/* prepare workqueue args for asynchronous rmdir */
	h_d = a->dst_h_dentry;
	if (au_ftest_ren(a->flags, ISDIR) && h_d->d_inode) {
		err = -ENOMEM;
		a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS);
		if (unlikely(!a->thargs))
			goto out;
		a->h_dst = dget(h_d);
	}

	/* create whiteout for src_dentry */
	if (au_ftest_ren(a->flags, WHSRC)) {
		a->src_bwh = au_dbwh(a->src_dentry);
		AuDebugOn(a->src_bwh >= 0);
		a->src_wh_dentry
			= au_wh_create(a->src_dentry, a->btgt, a->src_h_parent);
		err = PTR_ERR(a->src_wh_dentry);
		if (IS_ERR(a->src_wh_dentry))
			goto out_thargs;
	}

	/* lookup whiteout for dentry */
	if (au_ftest_ren(a->flags, WHDST)) {
		h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name,
				 a->br);
		err = PTR_ERR(h_d);
		if (IS_ERR(h_d))
			goto out_whsrc;
		if (!h_d->d_inode)
			dput(h_d);
		else
			a->dst_wh_dentry = h_d;
	}

	/* rename dentry to tmpwh */
	if (a->thargs) {
		err = au_whtmp_ren(a->dst_h_dentry, a->br);
		if (unlikely(err))
			goto out_whdst;

		d = a->dst_dentry;
		au_set_h_dptr(d, a->btgt, NULL);
		err = au_lkup_neg(d, a->btgt);
		if (unlikely(err))
			goto out_whtmp;
		a->dst_h_dentry = au_h_dptr(d, a->btgt);
	}

	/* cpup src */
	if (a->dst_h_dentry->d_inode && a->src_bstart != a->btgt) {
		struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
		struct file *h_file;

		mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
		AuDebugOn(au_dbstart(a->src_dentry) != a->src_bstart);
		h_file = au_h_open_pre(a->src_dentry, a->src_bstart);
		if (IS_ERR(h_file)) {
			err = PTR_ERR(h_file);
			h_file = NULL;
		} else
			err = au_sio_cpup_simple(a->src_dentry, a->btgt, -1,
						 !AuCpup_DTIME);
		mutex_unlock(h_mtx);
		au_h_open_post(a->src_dentry, a->src_bstart, h_file);
		if (unlikely(err))
			goto out_whtmp;
	}

	/* rename by vfs_rename or cpup */
	d = a->dst_dentry;
	if (au_ftest_ren(a->flags, ISDIR)
	    && (a->dst_wh_dentry
		|| au_dbdiropq(d) == a->btgt
		/* hide the lower to keep xino */
		|| a->btgt < au_dbend(d)
		|| au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ)))
		au_fset_ren(a->flags, DIROPQ);
	err = au_ren_or_cpup(a);
	if (unlikely(err))
		/* leave the copied-up one */
		goto out_whtmp;

	/* make dir opaque */
	if (au_ftest_ren(a->flags, DIROPQ)) {
		err = au_ren_diropq(a);
		if (unlikely(err))
			goto out_rename;
	}

	/* update target timestamps */
	AuDebugOn(au_dbstart(a->src_dentry) != a->btgt);
	a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt);
	vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/
	a->src_inode->i_ctime = a->h_path.dentry->d_inode->i_ctime;

	/* remove whiteout for dentry */
	if (a->dst_wh_dentry) {
		a->h_path.dentry = a->dst_wh_dentry;
		err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path,
					  a->dst_dentry);
		if (unlikely(err))
			goto out_diropq;
	}

	/* remove whtmp */
	if (a->thargs)
		au_ren_del_whtmp(a); /* ignore this error */

	err = 0;
	goto out_success;

out_diropq:
	if (au_ftest_ren(a->flags, DIROPQ))
		au_ren_rev_diropq(err, a);
out_rename:
	if (!au_ftest_ren(a->flags, CPUP))
		au_ren_rev_rename(err, a);
	else
		au_ren_rev_cpup(err, a);
	dput(a->h_dst);
out_whtmp:
	if (a->thargs)
		au_ren_rev_whtmp(err, a);
out_whdst:
	dput(a->dst_wh_dentry);
	a->dst_wh_dentry = NULL;
out_whsrc:
	if (a->src_wh_dentry)
		au_ren_rev_whsrc(err, a);
out_success:
	dput(a->src_wh_dentry);
	dput(a->dst_wh_dentry);
out_thargs:
	if (a->thargs) {
		dput(a->h_dst);
		au_whtmp_rmdir_free(a->thargs);
		a->thargs = NULL;
	}
out:
	return err;
}
Ejemplo n.º 20
0
int create_sto_nod(dentry_t *dentry, int mode, int dev)
#endif
{
	int err = 0;
	inode_t *dir;
	dentry_t *hidden_sto_dentry;
	dentry_t *hidden_sto_dir_dentry;

	if(exists_in_storage(dentry)) {
		err = -EEXIST;
		goto out;
	}
	err = get_neg_sto_dentry(dentry);

	if (err) {
                printk(KERN_CRIT "mini_fo: create_sto_nod: ERROR getting neg. sto dentry.\n");
                goto out;
        }

	dir = dentry->d_parent->d_inode;
	hidden_sto_dentry = dtohd2(dentry);

	/* lock parent */
	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);

	err = PTR_ERR(hidden_sto_dir_dentry);
	if (IS_ERR(hidden_sto_dir_dentry))
		goto out;

	err = vfs_mknod(hidden_sto_dir_dentry->d_inode, hidden_sto_dentry, mode, dev);
	if(err)
		goto out_lock;

	if(!dtohd2(dentry)->d_inode) {
		printk(KERN_CRIT "mini_fo: create_sto_nod: creating storage inode failed [1].\n");
		err = -EINVAL; /* return something indicating failure */
		goto out_lock;
	}

	/* interpose the new inode */
	if(dtost(dentry) == DELETED) {
		dtost(dentry) = DEL_REWRITTEN;
		err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
		if(err)
			goto out_lock;
	}
	else if(dtost(dentry) == NON_EXISTANT) {
		dtost(dentry) = CREATED;
		err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
		if(err)
			goto out_lock;
	}
	else if(dtost(dentry) == UNMODIFIED) {
		dtost(dentry) = MODIFIED;
		/* interpose on new inode */
		if(itohi2(dentry->d_inode) != NULL) {
			printk(KERN_CRIT "mini_fo: create_sto_nod: error, invalid inode detected.\n");
			err = -EINVAL;
			goto out_lock;
		}
		itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
	}

	fist_copy_attr_timesizes(dir, hidden_sto_dir_dentry->d_inode);

 out_lock:
	dput(hidden_sto_dir_dentry);
 out:
	return err;
}
PVRSRV_ERROR OSSecureExport(CONNECTION_DATA *psConnection,
							IMG_PVOID pvData,
							IMG_SECURE_TYPE *phSecure,
							CONNECTION_DATA **ppsSecureConnection)
{
	ENV_CONNECTION_DATA *psEnvConnection;
	CONNECTION_DATA *psSecureConnection;
	struct file *connection_file;
	struct file *secure_file;
	struct dentry *secure_dentry;
	struct vfsmount *secure_mnt;
	int secure_fd;
	IMG_BOOL bPmrUnlocked = IMG_FALSE;
	PVRSRV_ERROR eError;

	/* Obtain the current connections struct file */
	psEnvConnection = PVRSRVConnectionPrivateData(psConnection);
	connection_file = LinuxFileFromEnvConnection(psEnvConnection);

	/* Allocate a fd number */
	secure_fd = get_unused_fd();
	if (secure_fd < 0)
	{
		eError = PVRSRV_ERROR_OUT_OF_MEMORY;
		goto e0;
	}

	/*
		Get a reference to the dentry so when close is called we don't
		drop the last reference too early and delete the file
	*/
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
	secure_dentry = dget(connection_file->f_path.dentry);
	secure_mnt = mntget(connection_file->f_path.mnt);
#else
	secure_dentry = dget(connection_file->f_dentry);
	secure_mnt = mntget(connection_file->f_vfsmnt);
#endif

	/* PMR lock needs to be released before bridge lock to keep lock hierarchy
	* and avoid deadlock situation.
	* OSSecureExport() can be called from functions that are not acquiring
	* PMR lock (e.g. by PVRSRVSyncPrimServerSecureExportKM()) so we have to
	* check if PMR lock is locked. */
	if (PMRIsLockedByMe())
	{
		PMRUnlock();
		bPmrUnlocked = IMG_TRUE;
	}
	OSReleaseBridgeLock();

	/* Open our device (using the file information from our current connection) */
	secure_file = dentry_open(
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0))
					  &connection_file->f_path,
#else
					  connection_file->f_dentry,
					  connection_file->f_vfsmnt,
#endif
					  connection_file->f_flags,
					  current_cred());

	OSAcquireBridgeLock();
	if (bPmrUnlocked)
		PMRLock();

	/* Bail if the open failed */
	if (IS_ERR(secure_file))
	{
		put_unused_fd(secure_fd);
		eError = PVRSRV_ERROR_OUT_OF_MEMORY;
		goto e0;
	}

	/* Bind our struct file with it's fd number */
	fd_install(secure_fd, secure_file);

	/* Return the new services connection our secure data created */
#if defined(SUPPORT_DRM)
	psSecureConnection = LinuxConnectionFromFile(PVR_DRM_FILE_FROM_FILE(secure_file));
#else
	psSecureConnection = LinuxConnectionFromFile(secure_file);
#endif

	/* Save the private data */
	PVR_ASSERT(psSecureConnection->hSecureData == IMG_NULL);
	psSecureConnection->hSecureData = pvData;

	*phSecure = secure_fd;
	*ppsSecureConnection = psSecureConnection;
	return PVRSRV_OK;

e0:
	PVR_ASSERT(eError != PVRSRV_OK);
	return eError;
}
Ejemplo n.º 22
0
int create_sto_reg_file(dentry_t *dentry, int mode)
#endif
{
	int err = 0;
	inode_t *dir;
	dentry_t *hidden_sto_dentry;
	dentry_t *hidden_sto_dir_dentry;

	if(exists_in_storage(dentry)) {
		printk(KERN_CRIT "mini_fo: create_sto_file: wrong type or state.\n");
		err = -EINVAL;
		goto out;
	}
	err = get_neg_sto_dentry(dentry);

	if (err) {
		printk(KERN_CRIT "mini_fo: create_sto_file: ERROR getting neg. sto dentry.\n");
		goto out;
	}

	dir = dentry->d_parent->d_inode;
	hidden_sto_dentry = dtohd2(dentry);

	/* lock parent */
	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);

	err = PTR_ERR(hidden_sto_dir_dentry);
        if (IS_ERR(hidden_sto_dir_dentry))
                goto out;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
	err = vfs_create(hidden_sto_dir_dentry->d_inode,
			 hidden_sto_dentry,
			 mode, nd);
#else
	err = vfs_create(hidden_sto_dir_dentry->d_inode,
			 hidden_sto_dentry,
			 mode);
#endif
        if(err) {
		printk(KERN_CRIT "mini_fo: create_sto_file: ERROR creating sto file.\n");
                goto out_lock;
	}

	if(!dtohd2(dentry)->d_inode) {
		printk(KERN_CRIT "mini_fo: create_sto_file: ERROR creating sto file [2].\n");
                err = -EINVAL;
                goto out_lock;
        }

        /* interpose the new inode */
        if(dtost(dentry) == DELETED) {
                dtost(dentry) = DEL_REWRITTEN;
                err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
                if(err)
                        goto out_lock;
        }
        else if(dtost(dentry) == NON_EXISTANT) {
                dtost(dentry) = CREATED;
                err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
                if(err)
                        goto out_lock;
        }
        else if(dtost(dentry) == UNMODIFIED) {
                dtost(dentry) = MODIFIED;
                /* interpose on new inode */
                if(itohi2(dentry->d_inode) != NULL) {
                        printk(KERN_CRIT "mini_fo: create_sto_file: invalid inode detected.\n");
                        err = -EINVAL;
                        goto out_lock;
                }
                itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
	}
	fist_copy_attr_timesizes(dentry->d_parent->d_inode,
				 hidden_sto_dir_dentry->d_inode);

 out_lock:
        dput(hidden_sto_dir_dentry);
 out:
	return err;
}
Ejemplo n.º 23
0
/*
 * nfs_follow_mountpoint - handle crossing a mountpoint on the server
 * @dentry - dentry of mountpoint
 * @nd - nameidata info
 *
 * When we encounter a mountpoint on the server, we want to set up
 * a mountpoint on the client too, to prevent inode numbers from
 * colliding, and to allow "df" to work properly.
 * On NFSv4, we also want to allow for the fact that different
 * filesystems may be migrated to different servers in a failover
 * situation, and that different filesystems may want to use
 * different security flavours.
 */
static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
{
	struct vfsmount *mnt;
	struct nfs_server *server = NFS_SERVER(dentry->d_inode);
	struct dentry *parent;
	struct nfs_fh fh;
	struct nfs_fattr fattr;
	int err;

	dprintk("--> nfs_follow_mountpoint()\n");

	err = -ESTALE;
	if (IS_ROOT(dentry))
		goto out_err;

	dprintk("%s: enter\n", __func__);
	dput(nd->path.dentry);
	nd->path.dentry = dget(dentry);

	/* Look it up again */
	parent = dget_parent(nd->path.dentry);
	err = server->nfs_client->rpc_ops->lookup(parent->d_inode,
						  &nd->path.dentry->d_name,
						  &fh, &fattr);
	dput(parent);
	if (err != 0)
		goto out_err;

	if (fattr.valid & NFS_ATTR_FATTR_V4_REFERRAL)
		mnt = nfs_do_refmount(nd->path.mnt, nd->path.dentry);
	else
		mnt = nfs_do_submount(nd->path.mnt, nd->path.dentry, &fh,
				      &fattr);
	err = PTR_ERR(mnt);
	if (IS_ERR(mnt))
		goto out_err;

	mntget(mnt);
	err = do_add_mount(mnt, &nd->path, nd->path.mnt->mnt_flags|MNT_SHRINKABLE,
			   &nfs_automount_list);
	if (err < 0) {
		mntput(mnt);
		if (err == -EBUSY)
			goto out_follow;
		goto out_err;
	}
	path_put(&nd->path);
	nd->path.mnt = mnt;
	nd->path.dentry = dget(mnt->mnt_root);
	schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
out:
	dprintk("%s: done, returned %d\n", __func__, err);

	dprintk("<-- nfs_follow_mountpoint() = %d\n", err);
	return ERR_PTR(err);
out_err:
	path_put(&nd->path);
	goto out;
out_follow:
	while (d_mountpoint(nd->path.dentry) &&
	       follow_down(&nd->path.mnt, &nd->path.dentry))
		;
	err = 0;
	goto out;
}
Ejemplo n.º 24
0
static int load_elf_binary(struct linux_binprm *bprm)
{
  struct pt_regs regs; 
  int interpreter_fd = -1;
   unsigned long load_addr = 0, load_bias;
  int load_addr_set = 0;
  char * elf_interpreter = NULL;
  unsigned int interpreter_type = INTERPRETER_NONE;
  unsigned long error;
  struct elf_phdr * elf_ppnt, *elf_phdata;
  unsigned long elf_bss, k, elf_brk;
  int elf_exec_fileno;
  int retval, size, i;
  unsigned long elf_entry, interp_load_addr = 0;
  unsigned long start_code, end_code, end_data;
  struct elfhdr elf_ex;
  struct elfhdr interp_elf_ex;
    struct exec interp_ex;
  char passed_fileno[6];
  
  /* Get the exec-header */
  elf_ex = *((struct elfhdr *) bprm->buf);
  my_print("[debug]here to run elf\n");
  retval = -ENOEXEC;
  /* First of all, some simple consistency checks */
  if (elf_ex.e_ident[0] != 0x7f ||
      strncmp(&elf_ex.e_ident[1], "ELF", 3) != 0)
    goto out;
  //my_print("[ender]1\n");
  if (elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN)
    goto out;
  if (!elf_check_arch(elf_ex.e_machine))
    goto out;
  //my_print("[ender]2\n");

  /* Now read in all of the header information */

  if (elf_ex.e_phentsize != sizeof(struct elf_phdr) ||
      elf_ex.e_phnum < 1 ||
      elf_ex.e_phnum > 65536 / sizeof(struct elf_phdr))
    goto out;
 // my_print("[ender]3\n");
  retval = -ENOMEM;
  size = elf_ex.e_phentsize * elf_ex.e_phnum;
  elf_phdata = (struct elf_phdr *) malloc(size);
  if (!elf_phdata)
    goto out;

  retval = read_exec(bprm->fd, elf_ex.e_phoff, (char *) elf_phdata, size, 1);
  if (retval < 0)
    goto out_free_ph;
  //my_print("[ender]4\n");

  elf_exec_fileno = dup(bprm->fd);
  lseek(elf_exec_fileno, 0, SEEK_SET);

  elf_ppnt = elf_phdata;
  elf_bss = 0;
  elf_brk = 0;

  start_code = ~0UL;
  end_code = 0;
  end_data = 0;

  /* look for interpreter */
  for (i = 0; i < elf_ex.e_phnum; i++) {
    if (elf_ppnt->p_type == PT_INTERP) {
      retval = -ENOEXEC;
        if (elf_interpreter ||
          elf_ppnt->p_filesz < 2 ||
          elf_ppnt->p_filesz > PAGE_SIZE)
        goto out_free_dentry;

      /* This is the program interpreter used for
       * shared libraries - for now assume that this
       * is an a.out format binary
       */

      retval = -ENOMEM;
      elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
      if (!elf_interpreter)
        goto out_free_file;

      retval = read_exec(bprm->fd, elf_ppnt->p_offset,
             elf_interpreter, elf_ppnt->p_filesz, 1);
      if (retval < 0)
        goto out_free_interp;
      elf_interpreter[elf_ppnt->p_filesz - 1] = 0;
      
#if 0
      /* If the program interpreter is one of these two,
       * then assume an iBCS2 image. Otherwise assume
       * a native linux image.
       */
      if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
          strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
        ibcs2_interpreter = 1;
#endif

      log_debug(LOG_LINEXEC_EXEC, "Using ELF interpreter: %s", elf_interpreter);
	  if( elf_interpreter[0] == '/'){
		  char tmp [MAX_PATH];
          change_path_to_relative(tmp, elf_interpreter);
		  free(elf_interpreter);
		  //elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
          elf_interpreter = (char *)malloc(strlen(tmp)+1);
		  if (!elf_interpreter)
			  goto out_free_file;
		  strcpy(elf_interpreter, tmp);
	  }
      interpreter_fd = open(elf_interpreter, O_RDONLY);
	  my_print("[debug]open elf_interpreter %s\n", elf_interpreter);
      if (interpreter_fd < 0) {
        retval = -errno;
        goto out_free_interp;
      }

#if 0        
      retval = permission(interpreter_dentry->d_inode, MAY_EXEC);
      if (retval < 0)
        goto out_free_dentry;
#endif
        
      retval = read_exec(interpreter_fd, 0, bprm->buf, 128, 1);
      if (retval < 0)
        goto out_free_dentry;

      /* Get the exec headers */
      interp_ex = *((struct exec *) bprm->buf);
      interp_elf_ex = *((struct elfhdr *) bprm->buf);
    }
    elf_ppnt++;
	//my_print("[ender]6\n");
  }

  /* Some simple consistency checks for the interpreter */
  if (elf_interpreter) {
    interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;

    /* Now figure out which format our binary is */
    if ((N_MAGIC(interp_ex) != OMAGIC) &&
        (N_MAGIC(interp_ex) != ZMAGIC) &&
        (N_MAGIC(interp_ex) != QMAGIC))
      interpreter_type = INTERPRETER_ELF;

    if (interp_elf_ex.e_ident[0] != 0x7f ||
        strncmp(&interp_elf_ex.e_ident[1], "ELF", 3) != 0)
      interpreter_type &= ~INTERPRETER_ELF;

    retval = -ELIBBAD;
    if (!interpreter_type)
      goto out_free_dentry;

    /* Make sure only one type was selected */
    if ((interpreter_type & INTERPRETER_ELF) &&
         interpreter_type != INTERPRETER_ELF) {
      printf("ELF: Ambiguous type, using ELF\n");
      interpreter_type = INTERPRETER_ELF;
    }
  }
  //my_print("[ender]7\n");
  /* OK, we are done with that, now set up the arg stuff,
     and then start this sucker up */
  if (!bprm->sh_bang) {
    char * passed_p;

    if (interpreter_type == INTERPRETER_AOUT) {
      sprintf(passed_fileno, "%d", elf_exec_fileno);
      passed_p = passed_fileno;

      if (elf_interpreter) {
        bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p);
        bprm->argc++;
      }
    }
    retval = -E2BIG;
    if (!bprm->p)
      goto out_free_dentry;
  }


#if 0
  /* Flush all traces of the currently running executable */
  retval = flush_old_exec(bprm);
  if (retval)
    goto out_free_dentry;
#endif  

  /* OK, This is the point of no return */
  current->end_data = 0;
  current->end_code = 0;
#if 0
  current->mm->mmap = NULL;
  current->flags &= ~PF_FORKNOEXEC;

#endif  
  elf_entry = (unsigned long) elf_ex.e_entry;
  //printf("[ender]8\n");

#if 0
  /* Do this immediately, since STACK_TOP as used in setup_arg_pages
     may depend on the personality.  */
  SET_PERSONALITY(elf_ex, ibcs2_interpreter);
#endif  

  /* Do this so that we can load the interpreter, if need be.  We will
     change some of these later */
//  current->mm->rss = 0;
  bprm->p = setup_arg_pages(bprm->p, bprm);
  
  current->start_stack = bprm->p;

  /* Try and get dynamic programs out of the way of the default mmap
     base, as well as whatever program they might try to exec.  This
     is because the brk will follow the loader, and is not movable.  */

  load_bias = ELF_PAGESTART(elf_ex.e_type==ET_DYN ? ELF_ET_DYN_BASE : 0);
#ifdef __VERBOSE__
  printf("load_bias: %08lX\n", load_bias);
#endif

  /* Now we do a little grungy work by mmaping the ELF image into
     the correct location in memory.  At this point, we assume that
     the image should be loaded at fixed address, not at a variable
     address. */

  for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
    int elf_prot = 0, elf_flags;
    unsigned long vaddr;

    if (elf_ppnt->p_type != PT_LOAD)
      continue;

    if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
    if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
    if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;

    elf_flags = MAP_PRIVATE; // |MAP_DENYWRITE|MAP_EXECUTABLE;

    vaddr = elf_ppnt->p_vaddr;
    if (elf_ex.e_type == ET_EXEC || load_addr_set) {
      elf_flags |= MAP_FIXED;
    }
	//my_print("[ender]9\n");
#ifdef __VERBOSE__
    printf("mapping: %08lX\n", ELF_PAGESTART(load_bias + vaddr));
#endif
    error = do_mmap(bprm->fd, ELF_PAGESTART(load_bias + vaddr),
                    (elf_ppnt->p_filesz + ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
                    elf_prot, elf_flags, 
                    (elf_ppnt->p_offset - ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));

#ifdef __VERBOSE__
    printf("error: %08lX\n", error);
#endif

    if (!load_addr_set) {
      load_addr_set = 1;
      load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
#ifdef __VERBOSE__
      printf("load_addr: %08lX, vaddr: %08lX\n", load_addr, vaddr);
#endif      
      if (elf_ex.e_type == ET_DYN) {
        load_bias += error - ELF_PAGESTART(load_bias + vaddr);
        load_addr += error;
      
#ifdef __VERBOSE__
        printf("new\nload_bias: %08lX, load_addr: %08lX\n", load_bias, load_addr);
#endif        
      }
    }
    k = elf_ppnt->p_vaddr;
    if (k < start_code) start_code = k;
    k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
    if (k > elf_bss)
      elf_bss = k;
    if ((elf_ppnt->p_flags & PF_X) && end_code <  k)
      end_code = k;
    if (end_data < k)
      end_data = k;
    k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
    if (k > elf_brk)
      elf_brk = k;
  }
  
  close(bprm->fd);
  
  elf_entry += load_bias;
  elf_bss += load_bias;
  elf_brk += load_bias;
  start_code += load_bias;
  end_code += load_bias;
  end_data += load_bias;

  if (elf_interpreter) {
    if (interpreter_type == INTERPRETER_AOUT) {
      elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
    } else {
      elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, 
                                  &interp_load_addr);
    }                                  
    close(interpreter_fd);
    if (elf_entry == ~0UL) {
      printf("Unable to load interpreter %.128s\n", elf_interpreter);
      free(elf_interpreter);
      free(elf_phdata);
      
      //send_sig(SIGSEGV, current, 0);
      exit(1);
      return 0;
    }

    free(elf_interpreter);
  }
  
  free(elf_phdata);

  if (interpreter_type != INTERPRETER_AOUT)
    close(elf_exec_fileno);
  
#if 0
#ifndef VM_STACK_FLAGS
  current->executable = dget(bprm->dentry);
#endif
#endif
  bprm->p = (unsigned long)create_elf_tables((char *)bprm->p,
                        bprm->argc, bprm->envc,
                        (interpreter_type == INTERPRETER_ELF ? &elf_ex : NULL),
                        load_addr, load_bias, interp_load_addr,
                        (interpreter_type == INTERPRETER_AOUT ? 0 : 1));

#if 0                        
  /* N.B. passed_fileno might not be initialized? */
  if (interpreter_type == INTERPRETER_AOUT)
    current->arg_start += strlen(passed_fileno) + 1;
#endif  
    
  current->start_brk = current->brk = elf_brk;
  current->end_code = end_code;
  current->start_code = start_code;
  current->end_data = end_data;
  current->start_stack = bprm->p;

  /* Calling set_brk effectively mmaps the pages that we need
   * for the bss and break sections
   */
  set_brk(elf_bss, elf_brk);
  padzero(elf_bss);
  log_debug(LOG_LINEXEC_EXEC,"start_brk: %lx" , current->start_brk);
  log_debug(LOG_LINEXEC_EXEC,"end_code: %lx" , current->end_code);
  log_debug(LOG_LINEXEC_EXEC,"start_code: %lx" , current->start_code);
  log_debug(LOG_LINEXEC_EXEC,"end_data: %lx" , current->end_data);
  log_debug(LOG_LINEXEC_EXEC,"start_stack: %lx" , current->start_stack);
  log_debug(LOG_LINEXEC_EXEC,"brk: %lx" , current->brk);

  /*
   * The ABI may specify that certain registers be set up in special
   * ways (on i386 %edx is the address of a DT_FINI function, for
   * example.  This macro performs whatever initialization to
   * the regs structure is required.
   */
  ELF_PLAT_INIT((&regs));

  regs.eip = elf_entry;
  regs.esp = bprm->p;

#if 0
  if (current->flags & PF_PTRACED)
    send_sig(SIGTRAP, current, 0);
#endif

#ifndef __DEBUG__


//  dumpMemoryMap();
  log_verbose(LOG_LINEXEC_EXEC, "[transfering control to Linux executable]");
  //getchar();
  //printf("[ender]11\n");
  ASM_EXEC_JUMP(regs);
  
  printf("You should never see this message!\n");
 
#else

  printf("execve() finished, but in debug mode. exiting...\n");
 
#endif
    
  retval = 0;
out:
  return retval;

  /* error cleanup */
out_free_dentry:
  close(interpreter_fd);
  
out_free_interp:
  if (elf_interpreter) {
    free(elf_interpreter);
  }

out_free_file:
  close(elf_exec_fileno);
  
out_free_ph:
  free(elf_phdata);
  goto out;
}
Ejemplo n.º 25
0
int aufs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int err, rmdir_later;
	aufs_bindex_t bwh, bindex, bstart;
	struct au_dtime dt;
	struct au_pin pin;
	struct inode *inode;
	struct dentry *parent, *wh_dentry, *h_dentry;
	struct au_whtmp_rmdir *args;

	IMustLock(dir);

	err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
	if (unlikely(err))
		goto out;
	err = au_alive_dir(dentry);
	if (unlikely(err))
		goto out_unlock;
	inode = dentry->d_inode;
	IMustLock(inode);
	err = -ENOTDIR;
	if (unlikely(!S_ISDIR(inode->i_mode)))
		goto out_unlock; /* possible? */

	err = -ENOMEM;
	args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
	if (unlikely(!args))
		goto out_unlock;

	parent = dentry->d_parent; /* dir inode is locked */
	di_write_lock_parent(parent);
	err = au_test_empty(dentry, &args->whlist);
	if (unlikely(err))
		goto out_parent;

	bstart = au_dbstart(dentry);
	bwh = au_dbwh(dentry);
	bindex = -1;
	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	h_dentry = au_h_dptr(dentry, bstart);
	dget(h_dentry);
	rmdir_later = 0;
	if (bindex == bstart) {
		err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir);
		if (err > 0) {
			rmdir_later = err;
			err = 0;
		}
	} else {
		/* stop monitoring */
		au_hn_free(au_hi(inode, bstart));

		/* dir inode is locked */
		IMustLock(wh_dentry->d_parent->d_inode);
		err = 0;
	}

	if (!err) {
		vfsub_dead_dir(inode);
		au_set_dbdiropq(dentry, -1);
		epilog(dir, dentry, bindex);

		if (rmdir_later) {
			au_whtmp_kick_rmdir(dir, bstart, h_dentry, args);
			args = NULL;
		}

		goto out_unpin; /* success */
	}

	/* revert */
	AuLabel(revert);
	if (wh_dentry) {
		int rerr;

		rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt);
		if (rerr)
			err = rerr;
	}

out_unpin:
	au_unpin(&pin);
	dput(wh_dentry);
	dput(h_dentry);
out_parent:
	di_write_unlock(parent);
	if (args)
		au_whtmp_rmdir_free(args);
out_unlock:
	aufs_read_unlock(dentry, AuLock_DW);
out:
	AuTraceErr(err);
	return err;
}
Ejemplo n.º 26
0
/*
 * Look up one component of a pathname.
 * N.B. After this call _both_ fhp and resfh need an fh_put
 *
 * If the lookup would cross a mountpoint, and the mounted filesystem
 * is exported to the client with NFSEXP_CROSSMNT, then the lookup is
 * accepted as it stands and the mounted directory is
 * returned. Otherwise the covered directory is returned.
 * NOTE: this mountpoint crossing is not supported properly by all
 *   clients and is explicitly disallowed for NFSv3
 *      NeilBrown <[email protected]>
 */
int
nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
					int len, struct svc_fh *resfh)
{
	struct svc_export	*exp;
	struct dentry		*dparent;
	struct dentry		*dentry;
	int			err;

	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);

	/* Obtain dentry and export. */
	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
	if (err)
		goto out;

	dparent = fhp->fh_dentry;
	exp  = fhp->fh_export;

	err = nfserr_acces;

	/* Lookup the name, but don't follow links */
	if (isdotent(name, len)) {
		if (len==1)
			dentry = dget(dparent);
		else  { /* must be ".." */
			/* checking mountpoint crossing is very different when stepping up */
			if (dparent == exp->ex_dentry) {
				if (!EX_CROSSMNT(exp))
					dentry = dget(dparent); /* .. == . just like at / */
				else
				{
					struct svc_export *exp2 = NULL;
					struct dentry *dp;
					struct vfsmount *mnt = mntget(exp->ex_mnt);
					dentry = dget(dparent);
					while(follow_up(&mnt, &dentry))
						;
					dp = dget(dentry->d_parent);
					dput(dentry);
					dentry = dp;
					for ( ; exp2 == NULL && dp->d_parent != dp;
					      dp=dp->d_parent)
						exp2 = exp_get(exp->ex_client, dp->d_inode->i_dev, dp->d_inode->i_ino);
					if (exp2==NULL) {
						dput(dentry);
						dentry = dget(dparent);
					} else {
						exp = exp2;
					}
					mntput(mnt);
				}
			} else
				dentry = dget(dparent->d_parent);
		}
	} else {
		fh_lock(fhp);
		dentry = lookup_one_len(name, dparent, len);
		err = PTR_ERR(dentry);
		if (IS_ERR(dentry))
			goto out_nfserr;
		/*
		 * check if we have crossed a mount point ...
		 */
		if (d_mountpoint(dentry)) {
			struct svc_export *exp2 = NULL;
			struct vfsmount *mnt = mntget(exp->ex_mnt);
			struct dentry *mounts = dget(dentry);
			while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts))
				;
			exp2 = exp_get(rqstp->rq_client,
				       mounts->d_inode->i_dev,
				       mounts->d_inode->i_ino);
			if (exp2 && EX_CROSSMNT(exp2)) {
				/* successfully crossed mount point */
				exp = exp2;
				dput(dentry);
				dentry = mounts;
			} else
				dput(mounts);
			mntput(mnt);
		}
	}
	/*
	 * Note: we compose the file handle now, but as the
	 * dentry may be negative, it may need to be updated.
	 */
	err = fh_compose(resfh, exp, dentry, fhp);
	if (!err && !dentry->d_inode)
		err = nfserr_noent;
out:
	return err;

out_nfserr:
	err = nfserrno(err);
	goto out;
}
Ejemplo n.º 27
0
static int dazukofs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct dazukofs_sb_info *sbi;
	struct dentry *root;
	static const struct qstr name = { .name = "/", .len = 1 };
	struct dazukofs_dentry_info *di;

	sbi =  kmem_cache_zalloc(dazukofs_sb_info_cachep, GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sb->s_op = &dazukofs_sops;

	root = d_alloc(NULL, &name);
	if (!root) {
		kmem_cache_free(dazukofs_sb_info_cachep, sbi);
		return -ENOMEM;
	}

	sb->s_root = root;

	sb->s_root->d_op = &dazukofs_dops;
	sb->s_root->d_sb = sb;
	sb->s_root->d_parent = sb->s_root;

	di = kmem_cache_zalloc(dazukofs_dentry_info_cachep, GFP_KERNEL);
	if (!di) {
		kmem_cache_free(dazukofs_sb_info_cachep, sbi);
		dput(sb->s_root);
		return -ENOMEM;
	}

	set_dentry_private(sb->s_root, di);

	set_sb_private(sb, sbi);

	return 0;
}

static int dazukofs_read_super(struct super_block *sb, const char *dev_name)
{
	struct nameidata nd;
	struct dentry *lower_root;
	struct vfsmount *lower_mnt;
	int err;

	memset(&nd, 0, sizeof(struct nameidata));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
	err = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd.path);
#else
	err = path_lookup(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
#endif
	if (err)
		return err;

	lower_root = dget(nd.path.dentry);
	lower_mnt = mntget(nd.path.mnt);

	if (IS_ERR(lower_root)) {
		err = PTR_ERR(lower_root);
		goto out_put;
	}

	if (!lower_root->d_inode) {
		err = -ENOENT;
		goto out_put;
	}

	if (!S_ISDIR(lower_root->d_inode->i_mode)) {
		err = -EINVAL;
		goto out_put;
	}

	set_lower_sb(sb, lower_root->d_sb);
	sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
	set_lower_dentry(sb->s_root, lower_root, lower_mnt);

	err = dazukofs_interpose(lower_root, sb->s_root, sb, 0);
	if (err)
		goto out_put;
	goto out;

out_put:
	dput(lower_root);
	mntput(lower_mnt);
out:
	path_put(&nd.path);
	return err;
}

// FIXME!
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)

static struct dentry* dazukofs_get_sb(struct file_system_type *fs_type, int flags,
						   const char *dev_name, void *data)
{
	return mount_nodev(fs_type, flags, data, dazukofs_fill_super);
}
#else
static int dazukofs_get_sb(struct file_system_type *fs_type, int flags,
			   const char *dev_name, void *data,
			   struct vfsmount *mnt)
{
	struct super_block *sb;
	int err;

	err = get_sb_nodev(fs_type, flags, data, dazukofs_fill_super, mnt);

	if (err)
		goto out;
	
	sb = mnt->mnt_sb;

	err = dazukofs_parse_mount_options(data, sb);
	if (err)
		goto out_abort;

	err = dazukofs_read_super(sb, dev_name);
	if (err)
		goto out_abort;

	goto out;

out_abort:
	dput(sb->s_root);
	up_write(&sb->s_umount);
	deactivate_super(sb);
out:
	return err;
}
#endif

static void init_once(void *data)
{
	struct dazukofs_inode_info *inode_info =
		(struct dazukofs_inode_info *)data;

	memset(inode_info, 0, sizeof(struct dazukofs_inode_info));
	inode_init_once(&(inode_info->vfs_inode));
}

static void destroy_caches(void)
{
	if (dazukofs_inode_info_cachep) {
		kmem_cache_destroy(dazukofs_inode_info_cachep);
		dazukofs_inode_info_cachep = NULL;
	}

	if (dazukofs_sb_info_cachep) {
		kmem_cache_destroy(dazukofs_sb_info_cachep);
		dazukofs_sb_info_cachep = NULL;
	}

	if (dazukofs_dentry_info_cachep) {
		kmem_cache_destroy(dazukofs_dentry_info_cachep);
		dazukofs_dentry_info_cachep = NULL;
	}

	if (dazukofs_file_info_cachep) {
		kmem_cache_destroy(dazukofs_file_info_cachep);
		dazukofs_file_info_cachep = NULL;
	}
}

static int init_caches(void)
{
	dazukofs_inode_info_cachep =
		kmem_cache_create("dazukofs_inode_info_cache",
				  sizeof(struct dazukofs_inode_info), 0,
				  SLAB_HWCACHE_ALIGN,
				  init_once);
	if (!dazukofs_inode_info_cachep)
		goto out_nomem;

	dazukofs_sb_info_cachep =
		kmem_cache_create("dazukofs_sb_info_cache",
				  sizeof(struct dazukofs_sb_info), 0,
				  SLAB_HWCACHE_ALIGN,
				  NULL);
	if (!dazukofs_sb_info_cachep)
		goto out_nomem;

	dazukofs_dentry_info_cachep =
		kmem_cache_create("dazukofs_dentry_info_cache",
				  sizeof(struct dazukofs_dentry_info), 0,
				  SLAB_HWCACHE_ALIGN,
				  NULL);
	if (!dazukofs_dentry_info_cachep)
		goto out_nomem;

	dazukofs_file_info_cachep =
		kmem_cache_create("dazukofs_file_info_cache",
				  sizeof(struct dazukofs_file_info), 0,
				  SLAB_HWCACHE_ALIGN,
				  NULL);
	if (!dazukofs_file_info_cachep)
		goto out_nomem;

	return 0;

out_nomem:
	destroy_caches();
	return -ENOMEM;
}
Ejemplo n.º 28
0
/*
 * Object creation/destruction.
 */
LinuxSystemRoot* newLinuxSystemRoot(void)
{
    LinuxSystemRoot* object;
    unsigned m_seq = 0;


    object = talpa_alloc(sizeof(template_LinuxSystemRoot));
    if ( object )
    {
        struct task_struct* inittask;


        memcpy(object, &template_LinuxSystemRoot, sizeof(template_LinuxSystemRoot));
        object->i_ISystemRoot.object = object;

        talpa_tasklist_lock();
        inittask = talpa_find_task_by_pid(1);
        talpa_tasklist_unlock();

        if ( inittask )
        {
            struct fs_struct *init_fs;
            struct vfsmount *rootmnt;

            task_lock(inittask);
            init_fs = inittask->fs;
            if ( init_fs )
            {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,30)
  #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
                spin_lock(&init_fs->lock);
  #else
                write_lock(&init_fs->lock);
  #endif
                init_fs->users++;
  #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
                spin_unlock(&init_fs->lock);
  #else
                write_unlock(&init_fs->lock);
  #endif
#else
                atomic_inc(&init_fs->count);
#endif
            }
            task_unlock(inittask);

            if ( init_fs )
            {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
                spin_lock(&init_fs->lock);
#else
                write_lock(&init_fs->lock);
#endif


restart_mnt:
                talpa_vfsmount_lock(&m_seq); // locks dcache_lock on 2.4
                for (rootmnt = talpa_fs_mnt(init_fs); rootmnt != getParent(rootmnt); rootmnt = getParent(rootmnt));
                object->mMnt = mntget(rootmnt);
                object->mDentry = dget(rootmnt->mnt_root);
                if (talpa_vfsmount_unlock(&m_seq)) // unlocks dcache_lock on 2.4
                {
                    goto restart_mnt;
                }
  #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,30)
                init_fs->users--;
  #else
                atomic_dec(&init_fs->count);
  #endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
                spin_unlock(&init_fs->lock);
#else
                write_unlock(&init_fs->lock);
#endif
            }
        }

        if ( !object->mMnt || !object->mDentry )
        {
            if ( object->mMnt )
            {
                mntput(object->mMnt);
            }

            if ( object->mDentry )
            {
                dput(object->mDentry);
            }

            talpa_free(object);

            return NULL;
        }
    }

    return object;
}
Ejemplo n.º 29
0
static struct dentry *
nilfs_mount(struct file_system_type *fs_type, int flags,
	     const char *dev_name, void *data)
{
	struct nilfs_super_data sd;
	struct super_block *s;
	fmode_t mode = FMODE_READ | FMODE_EXCL;
	struct dentry *root_dentry;
	int err, s_new = false;

	if (!(flags & MS_RDONLY))
		mode |= FMODE_WRITE;

	sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
	if (IS_ERR(sd.bdev))
		return ERR_CAST(sd.bdev);

	sd.cno = 0;
	sd.flags = flags;
	if (nilfs_identify((char *)data, &sd)) {
		err = -EINVAL;
		goto failed;
	}

	/*
	 * once the super is inserted into the list by sget, s_umount
	 * will protect the lockfs code from trying to start a snapshot
	 * while we are mounting
	 */
	mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
	if (sd.bdev->bd_fsfreeze_count > 0) {
		mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
		err = -EBUSY;
		goto failed;
	}
	s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
	mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
	if (IS_ERR(s)) {
		err = PTR_ERR(s);
		goto failed;
	}

	if (!s->s_root) {
		char b[BDEVNAME_SIZE];

		s_new = true;

		/* New superblock instance created */
		s->s_flags = flags;
		s->s_mode = mode;
		strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
		sb_set_blocksize(s, block_size(sd.bdev));

		err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
		if (err)
			goto failed_super;

		s->s_flags |= MS_ACTIVE;
	} else if (!sd.cno) {
		int busy = false;

		if (nilfs_tree_was_touched(s->s_root)) {
			busy = nilfs_try_to_shrink_tree(s->s_root);
			if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
				printk(KERN_ERR "NILFS: the device already "
				       "has a %s mount.\n",
				       (s->s_flags & MS_RDONLY) ?
				       "read-only" : "read/write");
				err = -EBUSY;
				goto failed_super;
			}
		}
		if (!busy) {
			/*
			 * Try remount to setup mount states if the current
			 * tree is not mounted and only snapshots use this sb.
			 */
			err = nilfs_remount(s, &flags, data);
			if (err)
				goto failed_super;
		}
	}

	if (sd.cno) {
		err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
		if (err)
			goto failed_super;
	} else {
		root_dentry = dget(s->s_root);
	}

	if (!s_new)
		blkdev_put(sd.bdev, mode);

	return root_dentry;

 failed_super:
	deactivate_locked_super(s);

 failed:
	if (!s_new)
		blkdev_put(sd.bdev, mode);
	return ERR_PTR(err);
}
Ejemplo n.º 30
0
/*
 * Copy up a dentry to a file of specified name.
 *
 * @dir: used to pull the ->i_sb to access other branches
 * @dentry: the non-negative dentry whose lower_inode we should copy
 * @bstart: the branch of the lower_inode to copy from
 * @new_bindex: the branch to create the new file in
 * @name: the name of the file to create
 * @namelen: length of @name
 * @copyup_file: the "struct file" to return (optional)
 * @len: how many bytes to copy-up?
 */
int copyup_dentry(struct inode *dir, struct dentry *dentry, int bstart,
		  int new_bindex, const char *name, int namelen,
		  struct file **copyup_file, loff_t len)
{
	struct dentry *new_lower_dentry;
	struct dentry *old_lower_dentry = NULL;
	struct super_block *sb;
	int err = 0;
	int old_bindex;
	int old_bstart;
	int old_bend;
	struct dentry *new_lower_parent_dentry = NULL;
	mm_segment_t oldfs;
	char *symbuf = NULL;

	verify_locked(dentry);

	old_bindex = bstart;
	old_bstart = dbstart(dentry);
	old_bend = dbend(dentry);

	BUG_ON(new_bindex < 0);
	BUG_ON(new_bindex >= old_bindex);

	sb = dir->i_sb;

	err = is_robranch_super(sb, new_bindex);
	if (err)
		goto out;

	/* Create the directory structure above this dentry. */
	new_lower_dentry = create_parents(dir, dentry, name, new_bindex);
	if (IS_ERR(new_lower_dentry)) {
		err = PTR_ERR(new_lower_dentry);
		goto out;
	}

	old_lower_dentry = unionfs_lower_dentry_idx(dentry, old_bindex);
	/* we conditionally dput this old_lower_dentry at end of function */
	dget(old_lower_dentry);

	/* For symlinks, we must read the link before we lock the directory. */
	if (S_ISLNK(old_lower_dentry->d_inode->i_mode)) {

		symbuf = kmalloc(PATH_MAX, GFP_KERNEL);
		if (unlikely(!symbuf)) {
			__clear(dentry, old_lower_dentry,
				old_bstart, old_bend,
				new_lower_dentry, new_bindex);
			err = -ENOMEM;
			goto out_free;
		}

		oldfs = get_fs();
		set_fs(KERNEL_DS);
		err = old_lower_dentry->d_inode->i_op->readlink(
			old_lower_dentry,
			(char __user *)symbuf,
			PATH_MAX);
		set_fs(oldfs);
		if (err < 0) {
			__clear(dentry, old_lower_dentry,
				old_bstart, old_bend,
				new_lower_dentry, new_bindex);
			goto out_free;
		}
		symbuf[err] = '\0';
	}

	/* Now we lock the parent, and create the object in the new branch. */
	new_lower_parent_dentry = lock_parent(new_lower_dentry);

	/* create the new inode */
	err = __copyup_ndentry(old_lower_dentry, new_lower_dentry,
			       new_lower_parent_dentry, symbuf);

	if (err) {
		__clear(dentry, old_lower_dentry,
			old_bstart, old_bend,
			new_lower_dentry, new_bindex);
		goto out_unlock;
	}

	/* We actually copyup the file here. */
	if (S_ISREG(old_lower_dentry->d_inode->i_mode))
		err = __copyup_reg_data(dentry, new_lower_dentry, new_bindex,
					old_lower_dentry, old_bindex,
					copyup_file, len);
	if (err)
		goto out_unlink;

	/* Set permissions. */
	err = copyup_permissions(sb, old_lower_dentry, new_lower_dentry);
	if (err)
		goto out_unlink;

#ifdef CONFIG_UNION_FS_XATTR
	/* Selinux uses extended attributes for permissions. */
	err = copyup_xattrs(old_lower_dentry, new_lower_dentry);
	if (err)
		goto out_unlink;
#endif /* CONFIG_UNION_FS_XATTR */

	/* do not allow files getting deleted to be re-interposed */
	if (!d_deleted(dentry))
		unionfs_reinterpose(dentry);

	goto out_unlock;

out_unlink:
	/*
	 * copyup failed, because we possibly ran out of space or
	 * quota, or something else happened so let's unlink; we don't
	 * really care about the return value of vfs_unlink
	 */
	vfs_unlink(new_lower_parent_dentry->d_inode, new_lower_dentry);

	if (copyup_file) {
		/* need to close the file */

		fput(*copyup_file);
		branchput(sb, new_bindex);
	}

	/*
	 * TODO: should we reset the error to something like -EIO?
	 *
	 * If we don't reset, the user may get some nonsensical errors, but
	 * on the other hand, if we reset to EIO, we guarantee that the user
	 * will get a "confusing" error message.
	 */

out_unlock:
	unlock_dir(new_lower_parent_dentry);

out_free:
	/*
	 * If old_lower_dentry was not a file, then we need to dput it.  If
	 * it was a file, then it was already dput indirectly by other
	 * functions we call above which operate on regular files.
	 */
	if (old_lower_dentry && old_lower_dentry->d_inode &&
	    !S_ISREG(old_lower_dentry->d_inode->i_mode))
		dput(old_lower_dentry);
	kfree(symbuf);

	if (err) {
		/*
		 * if directory creation succeeded, but inode copyup failed,
		 * then purge new dentries.
		 */
		if (dbstart(dentry) < old_bstart &&
		    ibstart(dentry->d_inode) > dbstart(dentry))
			__clear(dentry, NULL, old_bstart, old_bend,
				unionfs_lower_dentry(dentry), dbstart(dentry));
		goto out;
	}
	if (!S_ISDIR(dentry->d_inode->i_mode)) {
		unionfs_postcopyup_release(dentry);
		if (!unionfs_lower_inode(dentry->d_inode)) {
			/*
			 * If we got here, then we copied up to an
			 * unlinked-open file, whose name is .unionfsXXXXX.
			 */
			struct inode *inode = new_lower_dentry->d_inode;
			atomic_inc(&inode->i_count);
			unionfs_set_lower_inode_idx(dentry->d_inode,
						    ibstart(dentry->d_inode),
						    inode);
		}
	}
	unionfs_postcopyup_setmnt(dentry);
	/* sync inode times from copied-up inode to our inode */
	unionfs_copy_attr_times(dentry->d_inode);
	unionfs_check_inode(dir);
	unionfs_check_dentry(dentry);
out:
	return err;
}