Beispiel #1
0
static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
				void *cookie)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		kfree(s);
}
Beispiel #2
0
static void
HgfsPutlink(struct dentry *dentry, // dentry
            struct nameidata *nd)  // lookup name information
#endif
{
   char *fileName = NULL;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
   fileName = cookie;
   LOG(6, (KERN_DEBUG "VMware hgfs: %s: put for %s\n",
           __func__, fileName));
#else
   LOG(6, (KERN_DEBUG "VMware hgfs: %s: put for %s\n",
           __func__, dentry->d_name.name));
   fileName = nd_get_link(nd);
#endif
   if (!IS_ERR(fileName)) {
      LOG(6, (KERN_DEBUG "VMware hgfs: %s: putting %s\n",
              __func__, fileName));
      kfree(fileName);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
      nd_set_link(nd, NULL);
#endif
   }
}
/* this @nd *IS* still used */
static void wrapfs_put_link(struct dentry *dentry, struct nameidata *nd,
			    void *cookie)
{
	char *buf = nd_get_link(nd);
	if (!IS_ERR(buf))	/* free the char* */
		kfree(buf);
}
/* this @nd *IS* still used */
static void unionfs_put_link(struct dentry *dentry, struct nameidata *nd,
			     void *cookie)
{
	struct dentry *parent;
	char *buf;

	unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_CHILD);
	parent = unionfs_lock_parent(dentry, UNIONFS_DMUTEX_PARENT);
	unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);

	if (unlikely(!__unionfs_d_revalidate(dentry, parent, false)))
		printk(KERN_ERR
		       "unionfs: put_link failed to revalidate dentry\n");

	unionfs_check_dentry(dentry);
#if 0
	/* XXX: can't run this check b/c this fxn can receive a poisoned 'nd' PTR */
	unionfs_check_nd(nd);
#endif
	buf = nd_get_link(nd);
	if (!IS_ERR(buf))
		kfree(buf);
	unionfs_unlock_dentry(dentry);
	unionfs_unlock_parent(dentry, parent);
	unionfs_read_unlock(dentry->d_sb);
}
Beispiel #5
0
static void
zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
{
	const char *link = nd_get_link(nd);

	if (!IS_ERR(link))
		kmem_free(link, MAXPATHLEN);
}
static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
{
	befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
	if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
		char *p = nd_get_link(nd);
		if (!IS_ERR(p))
			kfree(p);
	}
}
Beispiel #7
0
void unionfs_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
#endif
{
	char *link;
	print_entry_location();
	link = nd_get_link(nd);
	KFREE(link);
	print_exit_location();
}
Beispiel #8
0
static void
ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
{
	char *buf = nd_get_link(nd);
	if (!IS_ERR(buf)) {
		/* Free the char* */
		kfree(buf);
	}
}
Beispiel #9
0
/**
 * \<\<private\>\> This VFS operation is called when the symlink pathname is not needed anymore by
 * VFS. It allows us to release the memory needed for the pathname.
 *
 * @param *dentry - points to the dentry of the symlink
 * @param *nd - where the pathname resides
 */
static void tcmi_ctlfs_symlink_put_link(struct dentry *dentry, struct nameidata *nd, void * vd)
{
	char *page = nd_get_link(nd);
	mdbg(INFO4, "Destroying pathname related data");
	if (!IS_ERR(page)) {
		mdbg(INFO4, "Freeing pathname buffer");
		free_page((unsigned long)page);
	}
}
Beispiel #10
0
	/* buf is allocated here, and freed when VFS calls our put_link method */
	err = -ENOMEM;
        buf = KMALLOC(len, GFP_KERNEL);
        if (!buf)
                goto out;

        old_fs = get_fs();
        set_fs(KERNEL_DS);
        err = dentry->d_inode->i_op->readlink(dentry, buf, len);
        set_fs(old_fs);
        if (err < 0)
                goto out_free;

        buf[err] = 0;	// terminate the buffer -- XXX still needed?
	err = 0;
	nd_set_link(nd,buf);
	goto out;

out_free:
	KFREE(buf);
out:
#if 0
        if (err < 0) {
                dput(nd->dentry);
                printk("EZK follow_link() mnt_cnt %d\n", 
                        (int) atomic_read(&nd->mnt->mnt_count));
                mntput(nd->mnt);
        }
#endif

        print_exit_status(err);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
        return err;
#else /* 2.6.13 or newer */
        return ERR_PTR(err);
#endif /* 2.6.13 or newer */
}

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
void
base0fs_put_link(struct dentry *dentry, struct nameidata *nd)
#else /* 2.6.13 or newer */
void
base0fs_put_link(struct dentry *dentry, struct nameidata *nd, void* unused)
#endif /* 2.6.13 or newer */
{
        print_entry_location();

        KFREE(nd_get_link(nd));

        print_exit_location();
}
Beispiel #11
0
STATIC void
xfs_vn_put_link(
	struct dentry	*dentry,
	struct nameidata *nd,
	void		*p)
{
	char		*s = nd_get_link(nd);

	if (!IS_ERR(s))
		kfree(s);
}
Beispiel #12
0
/* this @nd *IS* still used */
static void wrapfs_put_link(struct dentry *dentry, struct nameidata *nd,
			    void *cookie)
{
	char *buf = nd_get_link(nd);

	if(wrapfs_get_debug(dentry->d_sb) & DEBUG_INODE)
		DEBUG_MESG("Enter");

	if (!IS_ERR(buf))	/* free the char* */
		kfree(buf);

	if(wrapfs_get_debug(dentry->d_sb) & DEBUG_INODE)
		DEBUG_MESG("Exit");
}
Beispiel #13
0
static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
    struct page *page;

    page = page_follow_link_light(dentry, nd);
    if (IS_ERR(page))
        return page;

    /* this is broken symlink case */
    if (*nd_get_link(nd) == 0) {
        kunmap(page);
        page_cache_release(page);
        return ERR_PTR(-ENOENT);
    }
    return page;
}
Beispiel #14
0
static void
HgfsPutlink(struct dentry *dentry, // dentry
            struct nameidata *nd)  // lookup name information
#endif
{
   char *fileName = NULL;

   LOG(6, (KERN_DEBUG "VMware hgfs: %s: put for %s\n",
           __func__, dentry->d_name.name));

   fileName = nd_get_link(nd);
   if (!IS_ERR(fileName)) {
      LOG(6, (KERN_DEBUG "VMware hgfs: %s: putting %s\n",
              __func__, fileName));
      kfree(fileName);
      nd_set_link(nd, NULL);
   }
}
Beispiel #15
0
/* this @nd *IS* still used */
static void unionfs_put_link(struct dentry *dentry, struct nameidata *nd,
			     void *cookie)
{
	struct dentry *parent;

	unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_CHILD);
	parent = unionfs_lock_parent(dentry, UNIONFS_DMUTEX_PARENT);
	unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);

	if (unlikely(!__unionfs_d_revalidate(dentry, parent, false)))
		printk(KERN_ERR
		       "unionfs: put_link failed to revalidate dentry\n");

	unionfs_check_dentry(dentry);
	unionfs_check_nd(nd);
	kfree(nd_get_link(nd));
	unionfs_unlock_dentry(dentry);
	unionfs_unlock_parent(dentry, parent);
	unionfs_read_unlock(dentry->d_sb);
}
Beispiel #16
0
static void smb_put_link(struct dentry *dentry, struct nameidata *nd)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		__putname(s);
}
Beispiel #17
0
static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
{
	free_link(nd_get_link(nd));
}
Beispiel #18
0
void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
{
	char *p = nd_get_link(nd);
	if (!IS_ERR(p))
		kfree(p);
}
Beispiel #19
0
struct dentry *f2fs_get_parent(struct dentry *child)
{
	struct qstr dotdot = {.len = 2, .name = ".."};
	struct page *page;
	unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
	if (!ino) {
		if (IS_ERR(page))
			return ERR_CAST(page);
		return ERR_PTR(-ENOENT);
	}
	return d_obtain_alias(f2fs_iget(child->d_sb, ino));
}

static int __recover_dot_dentries(struct inode *dir, nid_t pino)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct qstr dot = QSTR_INIT(".", 1);
	struct qstr dotdot = QSTR_INIT("..", 2);
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = 0;

	if (f2fs_readonly(sbi->sb)) {
		f2fs_msg(sbi->sb, KERN_INFO,
			"skip recovering inline_dots inode (ino:%lu, pino:%u) "
			"in readonly mountpoint", dir->i_ino, pino);
		return 0;
	}

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);

	de = f2fs_find_entry(dir, &dot, &page);
	if (de) {
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
	} else if (IS_ERR(page)) {
		err = PTR_ERR(page);
		goto out;
	} else {
		err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
		if (err)
			goto out;
	}

	de = f2fs_find_entry(dir, &dotdot, &page);
	if (de) {
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
	} else if (IS_ERR(page)) {
		err = PTR_ERR(page);
	} else {
		err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
	}
out:
	if (!err)
		clear_inode_flag(dir, FI_INLINE_DOTS);

	f2fs_unlock_op(sbi);
	return err;
}

static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
					struct nameidata *nd)
{
	struct inode *inode = NULL;
	struct f2fs_dir_entry *de;
	struct page *page;
	nid_t ino;
	int err = 0;
	unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));

	if (f2fs_encrypted_inode(dir)) {
		int res = fscrypt_get_encryption_info(dir);

		/*
		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
		 * created while the directory was encrypted and we
		 * don't have access to the key.
		 */
		if (fscrypt_has_encryption_key(dir))
			fscrypt_set_encrypted_dentry(dentry);
		fscrypt_set_d_op(dentry);
		if (res && res != -ENOKEY)
			return ERR_PTR(res);
	}

	if (dentry->d_name.len > F2FS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (!de) {
		if (IS_ERR(page))
			return (struct dentry *)page;
		return d_splice_alias(inode, dentry);
	}

	ino = le32_to_cpu(de->ino);
	f2fs_dentry_kunmap(dir, page);
	f2fs_put_page(page, 0);

	inode = f2fs_iget(dir->i_sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
		err = __recover_dot_dentries(dir, root_ino);
		if (err)
			goto err_out;
	}

	if (f2fs_has_inline_dots(inode)) {
		err = __recover_dot_dentries(inode, dir->i_ino);
		if (err)
			goto err_out;
	}
	if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
			(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
			!fscrypt_has_permitted_context(dir, inode)) {
		bool nokey = f2fs_encrypted_inode(inode) &&
			!fscrypt_has_encryption_key(inode);
		err = nokey ? -ENOKEY : -EPERM;
		goto err_out;
	}
	return d_splice_alias(inode, dentry);

err_out:
	iput(inode);
	return ERR_PTR(err);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode = d_inode(dentry);
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;

	trace_f2fs_unlink_enter(dir, dentry);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (!de) {
		if (IS_ERR(page))
			err = PTR_ERR(page);
		goto fail;
	}

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err) {
		f2fs_unlock_op(sbi);
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
		goto fail;
	}
	f2fs_delete_entry(de, page, dir, inode);
	f2fs_unlock_op(sbi);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
fail:
	trace_f2fs_unlink_exit(inode, err);
	return err;
}

static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	struct page *page;
	char *link;

	page = page_follow_link_light(dentry, nd);
	if (IS_ERR(page))
		return page;

	link = nd_get_link(nd);
	if (IS_ERR(link))
		return link;

	/* this is broken symlink case */
	if (*link == 0) {
		kunmap(page);
		page_cache_release(page);
		return ERR_PTR(-ENOENT);
	}
	return page;
}

static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
					const char *symname)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	size_t len = strlen(symname);
	struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
	struct fscrypt_symlink_data *sd = NULL;
	int err;

	if (f2fs_encrypted_inode(dir)) {
		err = fscrypt_get_encryption_info(dir);
		if (err)
			return err;

		if (!fscrypt_has_encryption_key(dir))
			return -EPERM;

		disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
				sizeof(struct fscrypt_symlink_data));
	}

	if (disk_link.len > dir->i_sb->s_blocksize)
		return -ENAMETOOLONG;

	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	if (f2fs_encrypted_inode(inode))
		inode->i_op = &f2fs_encrypted_symlink_inode_operations;
	else
		inode->i_op = &f2fs_symlink_inode_operations;
	inode_nohighmem(inode);
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);
	alloc_nid_done(sbi, inode->i_ino);

	if (f2fs_encrypted_inode(inode)) {
		struct qstr istr = QSTR_INIT(symname, len);
		struct fscrypt_str ostr;

		sd = kzalloc(disk_link.len, GFP_NOFS);
		if (!sd) {
			err = -ENOMEM;
			goto err_out;
		}

		err = fscrypt_get_encryption_info(inode);
		if (err)
			goto err_out;

		if (!fscrypt_has_encryption_key(inode)) {
			err = -EPERM;
			goto err_out;
		}

		ostr.name = sd->encrypted_path;
		ostr.len = disk_link.len;
		err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
		if (err < 0)
			goto err_out;

		sd->len = cpu_to_le16(ostr.len);
		disk_link.name = (char *)sd;
	}

	err = page_symlink(inode, disk_link.name, disk_link.len);

err_out:
	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	/*
	 * Let's flush symlink data in order to avoid broken symlink as much as
	 * possible. Nevertheless, fsyncing is the best way, but there is no
	 * way to get a file descriptor in order to flush that.
	 *
	 * Note that, it needs to do dir->fsync to make this recoverable.
	 * If the symlink path is stored into inline_data, there is no
	 * performance regression.
	 */
	if (!err) {
		filemap_write_and_wait_range(inode->i_mapping, 0,
							disk_link.len - 1);

		if (IS_DIRSYNC(dir))
			f2fs_sync_fs(sbi->sb, 1);
	} else {
		f2fs_unlink(dir, dentry);
	}

	kfree(sd);
	return err;
out:
	handle_failed_inode(inode);
	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	int err;

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_dir_inode_operations;
	inode->i_fop = &f2fs_dir_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);

	f2fs_balance_fs(sbi, true);

	set_inode_flag(inode, FI_INC_LINK);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out_fail;
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;

out_fail:
	clear_inode_flag(inode, FI_INC_LINK);
	handle_failed_inode(inode);
	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = d_inode(dentry);
	if (f2fs_empty_dir(inode))
		return f2fs_unlink(dir, dentry);
	return -ENOTEMPTY;
}

static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
				umode_t mode, dev_t rdev)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	int err = 0;

	if (!new_valid_dev(rdev))
		return -EINVAL;

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	init_special_inode(inode, inode->i_mode, rdev);
	inode->i_op = &f2fs_special_inode_operations;

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;
out:
	handle_failed_inode(inode);
	return err;
}

static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
	struct page *old_dir_page;
	struct page *old_page, *new_page;
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
	bool is_old_inline = f2fs_has_inline_dentry(old_dir);
	int err = -ENOENT;

	if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
			!fscrypt_has_permitted_context(new_dir, old_inode)) {
		err = -EPERM;
		goto out;
	}

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	if (!old_entry) {
		if (IS_ERR(old_page))
			err = PTR_ERR(old_page);
		goto out;
	}

	if (S_ISDIR(old_inode->i_mode)) {
		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
		if (!old_dir_entry) {
			if (IS_ERR(old_dir_page))
				err = PTR_ERR(old_dir_page);
			goto out_old;
		}
	}

	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
			goto out_dir;

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry) {
			if (IS_ERR(new_page))
				err = PTR_ERR(new_page);
			goto out_dir;
		}

		f2fs_balance_fs(sbi, true);

		f2fs_lock_op(sbi);

		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

		err = update_dent_inode(old_inode, new_inode,
						&new_dentry->d_name);
		if (err) {
			release_orphan_inode(sbi);
			goto put_out_dir;
		}

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
		down_write(&F2FS_I(new_inode)->i_sem);
		if (old_dir_entry)
			f2fs_i_links_write(new_inode, false);
		f2fs_i_links_write(new_inode, false);
		up_write(&F2FS_I(new_inode)->i_sem);

		if (!new_inode->i_nlink)
			add_orphan_inode(new_inode);
		else
			release_orphan_inode(sbi);
	} else {
		f2fs_balance_fs(sbi, true);

		f2fs_lock_op(sbi);

		err = f2fs_add_link(new_dentry, old_inode);
		if (err) {
			f2fs_unlock_op(sbi);
			goto out_dir;
		}

		if (old_dir_entry)
			f2fs_i_links_write(new_dir, true);

		/*
		 * old entry and new entry can locate in the same inline
		 * dentry in inode, when attaching new entry in inline dentry,
		 * it could force inline dentry conversion, after that,
		 * old_entry and old_page will point to wrong address, in
		 * order to avoid this, let's do the check and update here.
		 */
		if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
			f2fs_put_page(old_page, 0);
			old_page = NULL;

			old_entry = f2fs_find_entry(old_dir,
						&old_dentry->d_name, &old_page);
			if (!old_entry) {
				err = -ENOENT;
				if (IS_ERR(old_page))
					err = PTR_ERR(old_page);
				f2fs_unlock_op(sbi);
				goto out_dir;
			}
		}
	}

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
	if (new_inode && file_enc_name(new_inode))
		file_set_enc_name(old_inode);
	up_write(&F2FS_I(old_inode)->i_sem);

	old_inode->i_ctime = CURRENT_TIME;
	f2fs_mark_inode_dirty_sync(old_inode);

	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);

	if (old_dir_entry) {
		if (old_dir != new_dir) {
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
		} else {
			f2fs_dentry_kunmap(old_inode, old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		f2fs_i_links_write(old_dir, false);
	}

	f2fs_unlock_op(sbi);

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;

put_out_dir:
	f2fs_unlock_op(sbi);
	f2fs_dentry_kunmap(new_dir, new_page);
	f2fs_put_page(new_page, 0);
out_dir:
	if (old_dir_entry) {
		f2fs_dentry_kunmap(old_inode, old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
out_old:
	f2fs_dentry_kunmap(old_dir, old_page);
	f2fs_put_page(old_page, 0);
out:
	return err;
}

static void *f2fs_encrypted_follow_link(struct dentry *dentry,
						struct nameidata *nd)
{
	struct page *cpage = NULL;
	char *caddr, *paddr = NULL;
	struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
	struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
	struct fscrypt_symlink_data *sd;
	struct inode *inode = d_inode(dentry);
	loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
	u32 max_size = inode->i_sb->s_blocksize;
	int res;

	res = fscrypt_get_encryption_info(inode);
	if (res)
		return ERR_PTR(res);

	cpage = read_mapping_page(inode->i_mapping, 0, NULL);
	if (IS_ERR(cpage))
		return cpage;
	caddr = kmap(cpage);
	caddr[size] = 0;

	/* Symlink is encrypted */
	sd = (struct fscrypt_symlink_data *)caddr;
	cstr.name = sd->encrypted_path;
	cstr.len = le16_to_cpu(sd->len);

	/* this is broken symlink case */
	if (unlikely(cstr.len == 0)) {
		res = -ENOENT;
		goto errout;
	}

	if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
		/* Symlink data on the disk is corrupted */
		res = -EIO;
		goto errout;
	}
	res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
	if (res)
		goto errout;

	res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
	if (res < 0)
		goto errout;

	/* this is broken symlink case */
	if (unlikely(pstr.name[0] == 0)) {
		res = -ENOENT;
		goto errout;
	}

	paddr = pstr.name;

	/* Null-terminate the name */
	paddr[res] = '\0';
	nd_set_link(nd, paddr);

	kunmap(cpage);
	page_cache_release(cpage);
	return NULL;
errout:
	fscrypt_fname_free_buffer(&pstr);
	kunmap(cpage);
	page_cache_release(cpage);
	return ERR_PTR(res);
}

void kfree_put_link(struct dentry *dentry, struct nameidata *nd,
		void *cookie)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		kfree(s);
}
Beispiel #20
0
static void jffs2_put_link(struct dentry *dentry, struct nameidata *nd)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		kfree(s);
}
struct dentry *f2fs_get_parent(struct dentry *child)
{
	struct qstr dotdot = {.len = 2, .name = ".."};
	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
}

static int __recover_dot_dentries(struct inode *dir, nid_t pino)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct qstr dot = {.len = 1, .name = "."};
	struct qstr dotdot = {.len = 2, .name = ".."};
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = 0;

	f2fs_lock_op(sbi);

	de = f2fs_find_entry(dir, &dot, &page, 0);
	if (de) {
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
	} else {
		err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
		if (err)
			goto out;
	}

	de = f2fs_find_entry(dir, &dotdot, &page, 0);
	if (de) {
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
	} else {
		err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
	}
out:
	if (!err) {
		clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
		mark_inode_dirty(dir);
	}

	f2fs_unlock_op(sbi);
	return err;
}

static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
					struct nameidata *nd)
{
	struct inode *inode = NULL;
	struct f2fs_dir_entry *de;
	struct page *page;
	nid_t ino;
	int err = 0;

	if (dentry->d_name.len > F2FS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	de = f2fs_find_entry(dir, &dentry->d_name, &page, nd ? nd->flags : 0);
	if (!de)
		return d_splice_alias(inode, dentry);

	ino = le32_to_cpu(de->ino);
	f2fs_dentry_kunmap(dir, page);
	f2fs_put_page(page, 0);

	inode = f2fs_iget(dir->i_sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	if (f2fs_has_inline_dots(inode)) {
		err = __recover_dot_dentries(inode, dir->i_ino);
		if (err)
			goto err_out;
	}
	return d_splice_alias(inode, dentry);

err_out:
	iget_failed(inode);
	return ERR_PTR(err);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode = dentry->d_inode;
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;

	trace_f2fs_unlink_enter(dir, dentry);
	f2fs_balance_fs(sbi);

	de = f2fs_find_entry(dir, &dentry->d_name, &page, 0);
	if (!de)
		goto fail;

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err) {
		f2fs_unlock_op(sbi);
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
		goto fail;
	}
	f2fs_delete_entry(de, page, dir, inode);
	f2fs_unlock_op(sbi);

	/* In order to evict this inode, we set it dirty */
	mark_inode_dirty(inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
fail:
	trace_f2fs_unlink_exit(inode, err);
	return err;
}

static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	struct page *page;

	page = page_follow_link_light(dentry, nd);
	if (IS_ERR(page))
		return page;

	/* this is broken symlink case */
	if (*nd_get_link(nd) == 0) {
		kunmap(page);
		page_cache_release(page);
		return ERR_PTR(-ENOENT);
	}
	return page;
}

static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
					const char *symname)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	size_t len = strlen(symname);
	size_t p_len;
	char *p_str;
	struct f2fs_str disk_link = FSTR_INIT(NULL, 0);
	struct f2fs_encrypted_symlink_data *sd = NULL;
	int err;

	if (len > dir->i_sb->s_blocksize)
		return -ENAMETOOLONG;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	if (f2fs_encrypted_inode(inode))
		inode->i_op = &f2fs_encrypted_symlink_inode_operations;
	else
		inode->i_op = &f2fs_symlink_inode_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);
	alloc_nid_done(sbi, inode->i_ino);

	if (f2fs_encrypted_inode(dir)) {
		struct qstr istr = QSTR_INIT(symname, len);

		err = f2fs_get_encryption_info(inode);
		if (err)
			goto err_out;

		err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link);
		if (err)
			goto err_out;

		err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link);
		if (err < 0)
			goto err_out;

		p_len = encrypted_symlink_data_len(disk_link.len) + 1;

		if (p_len > dir->i_sb->s_blocksize) {
			err = -ENAMETOOLONG;
			goto err_out;
		}

		sd = kzalloc(p_len, GFP_NOFS);
		if (!sd) {
			err = -ENOMEM;
			goto err_out;
		}
		memcpy(sd->encrypted_path, disk_link.name, disk_link.len);
		sd->len = cpu_to_le16(disk_link.len);
		p_str = (char *)sd;
	} else {
		p_len = len + 1;
		p_str = (char *)symname;
	}

	err = page_symlink(inode, p_str, p_len);

err_out:
	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	/*
	 * Let's flush symlink data in order to avoid broken symlink as much as
	 * possible. Nevertheless, fsyncing is the best way, but there is no
	 * way to get a file descriptor in order to flush that.
	 *
	 * Note that, it needs to do dir->fsync to make this recoverable.
	 * If the symlink path is stored into inline_data, there is no
	 * performance regression.
	 */
	if (!err)
		filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);

	kfree(sd);
	f2fs_fname_crypto_free_buffer(&disk_link);
	return err;
out:
	handle_failed_inode(inode);
	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	int err;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_dir_inode_operations;
	inode->i_fop = &f2fs_dir_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);

	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out_fail;
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;

out_fail:
	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	handle_failed_inode(inode);
	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	if (f2fs_empty_dir(inode))
		return f2fs_unlink(dir, dentry);
	return -ENOTEMPTY;
}

static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
				int mode, dev_t rdev)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	int err = 0;

	if (!new_valid_dev(rdev))
		return -EINVAL;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	init_special_inode(inode, inode->i_mode, rdev);
	inode->i_op = &f2fs_special_inode_operations;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;
out:
	handle_failed_inode(inode);
	return err;
}

static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
	struct inode *old_inode = old_dentry->d_inode;
	struct inode *new_inode = new_dentry->d_inode;
	struct page *old_dir_page;
	struct page *old_page, *new_page;
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
	int err = -ENOENT;

	if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
		!f2fs_is_child_context_consistent_with_parent(new_dir,
							old_inode)) {
		err = -EPERM;
		goto out;
	}

	f2fs_balance_fs(sbi);

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page, 0);
	if (!old_entry)
		goto out;

	if (S_ISDIR(old_inode->i_mode)) {
		err = -EIO;
		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
		if (!old_dir_entry)
			goto out_old;
	}

	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
			goto out_dir;

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page, 0);
		if (!new_entry)
			goto out_dir;

		f2fs_lock_op(sbi);

		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

		if (update_dent_inode(old_inode, new_inode,
						&new_dentry->d_name)) {
			release_orphan_inode(sbi);
			goto put_out_dir;
		}

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
		down_write(&F2FS_I(new_inode)->i_sem);
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		up_write(&F2FS_I(new_inode)->i_sem);

		mark_inode_dirty(new_inode);

		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
		else
			release_orphan_inode(sbi);

		update_inode_page(old_inode);
		update_inode_page(new_inode);
	} else {
		f2fs_lock_op(sbi);

		err = f2fs_add_link(new_dentry, old_inode);
		if (err) {
			f2fs_unlock_op(sbi);
			goto out_dir;
		}

		if (old_dir_entry) {
			inc_nlink(new_dir);
			update_inode_page(new_dir);
		}
	}

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
	if (new_inode && file_enc_name(new_inode))
		file_set_enc_name(old_inode);
	up_write(&F2FS_I(old_inode)->i_sem);

	old_inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(old_inode);

	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);

	if (old_dir_entry) {
		if (old_dir != new_dir) {
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
			update_inode_page(old_inode);
		} else {
			f2fs_dentry_kunmap(old_inode, old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		drop_nlink(old_dir);
		mark_inode_dirty(old_dir);
		update_inode_page(old_dir);
	}

	f2fs_unlock_op(sbi);

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;

put_out_dir:
	f2fs_unlock_op(sbi);
	f2fs_dentry_kunmap(new_dir, new_page);
	f2fs_put_page(new_page, 0);
out_dir:
	if (old_dir_entry) {
		f2fs_dentry_kunmap(old_inode, old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
out_old:
	f2fs_dentry_kunmap(old_dir, old_page);
	f2fs_put_page(old_page, 0);
out:
	return err;
}

#ifdef CONFIG_F2FS_FS_ENCRYPTION
static void *f2fs_encrypted_follow_link(struct dentry *dentry,
						struct nameidata *nd)
{
	struct page *cpage = NULL;
	char *caddr, *paddr = NULL;
	struct f2fs_str cstr;
	struct f2fs_str pstr = FSTR_INIT(NULL, 0);
	struct inode *inode = dentry->d_inode;
	struct f2fs_encrypted_symlink_data *sd;
	loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
	u32 max_size = inode->i_sb->s_blocksize;
	int res;

	res = f2fs_get_encryption_info(inode);
	if (res)
		return ERR_PTR(res);

	cpage = read_mapping_page(inode->i_mapping, 0, NULL);
	if (IS_ERR(cpage))
		return cpage;
	caddr = kmap(cpage);
	caddr[size] = 0;

	/* Symlink is encrypted */
	sd = (struct f2fs_encrypted_symlink_data *)caddr;
	cstr.name = sd->encrypted_path;
	cstr.len = le16_to_cpu(sd->len);

	/* this is broken symlink case */
	if (cstr.name[0] == 0 && cstr.len == 0) {
		res = -ENOENT;
		goto errout;
	}

	if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) >
								max_size) {
		/* Symlink data on the disk is corrupted */
		res = -EIO;
		goto errout;
	}
	res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr);
	if (res)
		goto errout;

	res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
	if (res < 0)
		goto errout;

	paddr = pstr.name;

	/* Null-terminate the name */
	paddr[res] = '\0';
	nd_set_link(nd, paddr);

	kunmap(cpage);
	page_cache_release(cpage);
	return NULL;
errout:
	f2fs_fname_crypto_free_buffer(&pstr);
	kunmap(cpage);
	page_cache_release(cpage);
	return ERR_PTR(res);
}

void kfree_put_link(struct dentry *dentry, struct nameidata *nd,
		void *cookie)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		kfree(s);
}

const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
	.readlink       = generic_readlink,
	.follow_link    = f2fs_encrypted_follow_link,
	.put_link       = kfree_put_link,
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
};
#endif

const struct inode_operations f2fs_dir_inode_operations = {
	.create		= f2fs_create,
	.lookup		= f2fs_lookup,
	.link		= f2fs_link,
	.unlink		= f2fs_unlink,
	.symlink	= f2fs_symlink,
	.mkdir		= f2fs_mkdir,
	.rmdir		= f2fs_rmdir,
	.mknod		= f2fs_mknod,
	.rename		= f2fs_rename,
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
	.check_acl	= f2fs_check_acl,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

const struct inode_operations f2fs_symlink_inode_operations = {
	.readlink       = generic_readlink,
	.follow_link    = f2fs_follow_link,
	.put_link       = page_put_link,
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

const struct inode_operations f2fs_special_inode_operations = {
	.getattr	= f2fs_getattr,
	.setattr        = f2fs_setattr,
	.check_acl	= f2fs_check_acl,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr       = generic_setxattr,
	.getxattr       = generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr    = generic_removexattr,
#endif
};
static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
{
	char *link = nd_get_link(nd);
	if (!IS_ERR(link))
		kfree(link);
}
Beispiel #23
0
static void sf_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
{
    char *page = nd_get_link(nd);
    if (!IS_ERR(page))
        free_page((unsigned long)page);
}
Beispiel #24
0
static void
ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
{
	/* Free the char* */
	kfree(nd_get_link(nd));
}