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 // SPDX-License-Identifier: GPL-2.0-only
 /* * This file is part of UBIFS.
  *
  * Copyright (C) 2006-2008 Nokia Corporation.
  * Copyright (C) 2006, 2007 University of Szeged, Hungary
  *
  * Authors: Artem Bityutskiy (Битюцкий Артём)
  *          Adrian Hunter
  *          Zoltan Sogor
  */
 
 /*
  * This file implements directory operations.
  *
  * All FS operations in this file allocate budget before writing anything to the
  * media. If they fail to allocate it, the error is returned. The only
  * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
  * if they unable to allocate the budget, because deletion %-ENOSPC failure is
  * not what users are usually ready to get. UBIFS budgeting subsystem has some
  * space reserved for these purposes.
  *
  * All operations in this file write all inodes which they change straight
  * away, instead of marking them dirty. For example, 'ubifs_link()' changes
  * @i_size of the parent inode and writes the parent inode together with the
  * target inode. This was done to simplify file-system recovery which would
  * otherwise be very difficult to do. The only exception is rename which marks
  * the re-named inode dirty (because its @i_ctime is updated) but does not
  * write it, but just marks it as dirty.
  */
 
 #include "ubifs.h"
 
 /**
  * inherit_flags - inherit flags of the parent inode.
  * @dir: parent inode
  * @mode: new inode mode flags
  *
  * This is a helper function for 'ubifs_new_inode()' which inherits flag of the
  * parent directory inode @dir. UBIFS inodes inherit the following flags:
  * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
  *   sub-directory basis;
  * o %UBIFS_SYNC_FL - useful for the same reasons;
  * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
  *
  * This function returns the inherited flags.
  */
 static int inherit_flags(const struct inode *dir, umode_t mode)
 {
     int flags;
     const struct ubifs_inode *ui = ubifs_inode(dir);
 
     if (!S_ISDIR(dir->i_mode))
         /*
          * The parent is not a directory, which means that an extended
          * attribute inode is being created. No flags.
          */
         return 0;
 
     flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
     if (!S_ISDIR(mode))
         /* The "DIRSYNC" flag only applies to directories */
         flags &= ~UBIFS_DIRSYNC_FL;
     return flags;
 }
 
 /**
  * ubifs_new_inode - allocate new UBIFS inode object.
  * @c: UBIFS file-system description object
  * @dir: parent directory inode
  * @mode: inode mode flags
  *
  * This function finds an unused inode number, allocates new inode and
  * initializes it. Returns new inode in case of success and an error code in
  * case of failure.
  */
 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
                   umode_t mode)
 {
     int err;
     struct inode *inode;
     struct ubifs_inode *ui;
     bool encrypted = false;
 
     inode = new_inode(c->vfs_sb);
     ui = ubifs_inode(inode);
     if (!inode)
         return ERR_PTR(-ENOMEM);
 
     /*
      * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
      * marking them dirty in file write path (see 'file_update_time()').
      * UBIFS has to fully control "clean <-> dirty" transitions of inodes
      * to make budgeting work.
      */
     inode->i_flags |= S_NOCMTIME;
 
     inode_init_owner(&init_user_ns, inode, dir, mode);
     inode->i_mtime = inode->i_atime = inode->i_ctime =
              current_time(inode);
     inode->i_mapping->nrpages = 0;
 
     err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
     if (err) {
         ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
         goto out_iput;
     }
 
     switch (mode & S_IFMT) {
     case S_IFREG:
         inode->i_mapping->a_ops = &ubifs_file_address_operations;
         inode->i_op = &ubifs_file_inode_operations;
         inode->i_fop = &ubifs_file_operations;
         break;
     case S_IFDIR:
         inode->i_op  = &ubifs_dir_inode_operations;
         inode->i_fop = &ubifs_dir_operations;
         inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
         break;
     case S_IFLNK:
         inode->i_op = &ubifs_symlink_inode_operations;
         break;
     case S_IFSOCK:
     case S_IFIFO:
     case S_IFBLK:
     case S_IFCHR:
         inode->i_op  = &ubifs_file_inode_operations;
         break;
     default:
         BUG();
     }
 
     ui->flags = inherit_flags(dir, mode);
     ubifs_set_inode_flags(inode);
     if (S_ISREG(mode))
         ui->compr_type = c->default_compr;
     else
         ui->compr_type = UBIFS_COMPR_NONE;
     ui->synced_i_size = 0;
 
     spin_lock(&c->cnt_lock);
     /* Inode number overflow is currently not supported */
     if (c->highest_inum >= INUM_WARN_WATERMARK) {
         if (c->highest_inum >= INUM_WATERMARK) {
             spin_unlock(&c->cnt_lock);
             ubifs_err(c, "out of inode numbers");
             err = -EINVAL;
             goto out_iput;
         }
         ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
                (unsigned long)c->highest_inum, INUM_WATERMARK);
     }
 
     inode->i_ino = ++c->highest_inum;
     /*
      * The creation sequence number remains with this inode for its
      * lifetime. All nodes for this inode have a greater sequence number,
      * and so it is possible to distinguish obsolete nodes belonging to a
      * previous incarnation of the same inode number - for example, for the
      * purpose of rebuilding the index.
      */
     ui->creat_sqnum = ++c->max_sqnum;
     spin_unlock(&c->cnt_lock);
 
     if (encrypted) {
         err = fscrypt_set_context(inode, NULL);
         if (err) {
             ubifs_err(c, "fscrypt_set_context failed: %i", err);
             goto out_iput;
         }
     }
 
     return inode;
 
 out_iput:
     make_bad_inode(inode);
     iput(inode);
     return ERR_PTR(err);
 }
 
 static int dbg_check_name(const struct ubifs_info *c,
               const struct ubifs_dent_node *dent,
               const struct fscrypt_name *nm)
 {
     if (!dbg_is_chk_gen(c))
         return 0;
     if (le16_to_cpu(dent->nlen) != fname_len(nm))
         return -EINVAL;
     if (memcmp(dent->name, fname_name(nm), fname_len(nm)))
         return -EINVAL;
     return 0;
 }
 
 static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
                    unsigned int flags)
 {
     int err;
     union ubifs_key key;
     struct inode *inode = NULL;
     struct ubifs_dent_node *dent = NULL;
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct fscrypt_name nm;
 
     dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
 
     err = fscrypt_prepare_lookup(dir, dentry, &nm);
     generic_set_encrypted_ci_d_ops(dentry);
     if (err == -ENOENT)
         return d_splice_alias(NULL, dentry);
     if (err)
         return ERR_PTR(err);
 
     if (fname_len(&nm) > UBIFS_MAX_NLEN) {
         inode = ERR_PTR(-ENAMETOOLONG);
         goto done;
     }
 
     dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
     if (!dent) {
         inode = ERR_PTR(-ENOMEM);
         goto done;
     }
 
     if (fname_name(&nm) == NULL) {
         if (nm.hash & ~UBIFS_S_KEY_HASH_MASK)
             goto done; /* ENOENT */
         dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
         err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
     } else {
         dent_key_init(c, &key, dir->i_ino, &nm);
         err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
     }
 
     if (err) {
         if (err == -ENOENT)
             dbg_gen("not found");
         else
             inode = ERR_PTR(err);
         goto done;
     }
 
     if (dbg_check_name(c, dent, &nm)) {
         inode = ERR_PTR(-EINVAL);
         goto done;
     }
 
     inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
     if (IS_ERR(inode)) {
         /*
          * This should not happen. Probably the file-system needs
          * checking.
          */
         err = PTR_ERR(inode);
         ubifs_err(c, "dead directory entry '%pd', error %d",
               dentry, err);
         ubifs_ro_mode(c, err);
         goto done;
     }
 
     if (IS_ENCRYPTED(dir) &&
         (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
         !fscrypt_has_permitted_context(dir, inode)) {
         ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
                dir->i_ino, inode->i_ino);
         iput(inode);
         inode = ERR_PTR(-EPERM);
     }
 
 done:
     kfree(dent);
     fscrypt_free_filename(&nm);
     return d_splice_alias(inode, dentry);
 }
 
 static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry,
                 struct fscrypt_name *nm)
 {
     if (fscrypt_is_nokey_name(dentry))
         return -ENOKEY;
 
     return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm);
 }
 
 static int ubifs_create(struct user_namespace *mnt_userns, struct inode *dir,
             struct dentry *dentry, umode_t mode, bool excl)
 {
     struct inode *inode;
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
                     .dirtied_ino = 1 };
     struct ubifs_inode *dir_ui = ubifs_inode(dir);
     struct fscrypt_name nm;
     int err, sz_change;
 
     /*
      * Budget request settings: new inode, new direntry, changing the
      * parent directory inode.
      */
 
     dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
         dentry, mode, dir->i_ino);
 
     err = ubifs_budget_space(c, &req);
     if (err)
         return err;
 
     err = ubifs_prepare_create(dir, dentry, &nm);
     if (err)
         goto out_budg;
 
     sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
     inode = ubifs_new_inode(c, dir, mode);
     if (IS_ERR(inode)) {
         err = PTR_ERR(inode);
         goto out_fname;
     }
 
     err = ubifs_init_security(dir, inode, &dentry->d_name);
     if (err)
         goto out_inode;
 
     mutex_lock(&dir_ui->ui_mutex);
     dir->i_size += sz_change;
     dir_ui->ui_size = dir->i_size;
     dir->i_mtime = dir->i_ctime = inode->i_ctime;
     err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
     if (err)
         goto out_cancel;
     mutex_unlock(&dir_ui->ui_mutex);
 
     ubifs_release_budget(c, &req);
     fscrypt_free_filename(&nm);
     insert_inode_hash(inode);
     d_instantiate(dentry, inode);
     return 0;
 
 out_cancel:
     dir->i_size -= sz_change;
     dir_ui->ui_size = dir->i_size;
     mutex_unlock(&dir_ui->ui_mutex);
 out_inode:
     make_bad_inode(inode);
     iput(inode);
 out_fname:
     fscrypt_free_filename(&nm);
 out_budg:
     ubifs_release_budget(c, &req);
     ubifs_err(c, "cannot create regular file, error %d", err);
     return err;
 }
 
 static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
 {
     int err;
     umode_t mode = S_IFCHR | WHITEOUT_MODE;
     struct inode *inode;
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct fscrypt_name nm;
 
     /*
      * Create an inode('nlink = 1') for whiteout without updating journal,
      * let ubifs_jnl_rename() store it on flash to complete rename whiteout
      * atomically.
      */
 
     dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
         dentry, mode, dir->i_ino);
 
     err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
     if (err)
         return ERR_PTR(err);
 
     inode = ubifs_new_inode(c, dir, mode);
     if (IS_ERR(inode)) {
         err = PTR_ERR(inode);
         goto out_free;
     }
 
     init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
     ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations);
 
     err = ubifs_init_security(dir, inode, &dentry->d_name);
     if (err)
         goto out_inode;
 
     /* The dir size is updated by do_rename. */
     insert_inode_hash(inode);
 
     return inode;
 
 out_inode:
     make_bad_inode(inode);
     iput(inode);
 out_free:
     fscrypt_free_filename(&nm);
     ubifs_err(c, "cannot create whiteout file, error %d", err);
     return ERR_PTR(err);
 }
 
 /**
  * lock_2_inodes - a wrapper for locking two UBIFS inodes.
  * @inode1: first inode
  * @inode2: second inode
  *
  * We do not implement any tricks to guarantee strict lock ordering, because
  * VFS has already done it for us on the @i_mutex. So this is just a simple
  * wrapper function.
  */
 static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
 {
     mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
     mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
 }
 
 /**
  * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
  * @inode1: first inode
  * @inode2: second inode
  */
 static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
 {
     mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
     mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
 }
 
 static int ubifs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
              struct dentry *dentry, umode_t mode)
 {
     struct inode *inode;
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
                     .dirtied_ino = 1};
     struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
     struct ubifs_inode *ui;
     int err, instantiated = 0;
     struct fscrypt_name nm;
 
     /*
      * Budget request settings: new inode, new direntry, changing the
      * parent directory inode.
      * Allocate budget separately for new dirtied inode, the budget will
      * be released via writeback.
      */
 
     dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
         dentry, mode, dir->i_ino);
 
     err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
     if (err)
         return err;
 
     err = ubifs_budget_space(c, &req);
     if (err) {
         fscrypt_free_filename(&nm);
         return err;
     }
 
     err = ubifs_budget_space(c, &ino_req);
     if (err) {
         ubifs_release_budget(c, &req);
         fscrypt_free_filename(&nm);
         return err;
     }
 
     inode = ubifs_new_inode(c, dir, mode);
     if (IS_ERR(inode)) {
         err = PTR_ERR(inode);
         goto out_budg;
     }
     ui = ubifs_inode(inode);
 
     err = ubifs_init_security(dir, inode, &dentry->d_name);
     if (err)
         goto out_inode;
 
     mutex_lock(&ui->ui_mutex);
     insert_inode_hash(inode);
     d_tmpfile(dentry, inode);
     ubifs_assert(c, ui->dirty);
 
     instantiated = 1;
     mutex_unlock(&ui->ui_mutex);
 
     lock_2_inodes(dir, inode);
     err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
     if (err)
         goto out_cancel;
     unlock_2_inodes(dir, inode);
 
     ubifs_release_budget(c, &req);
 
     return 0;
 
 out_cancel:
     unlock_2_inodes(dir, inode);
 out_inode:
     make_bad_inode(inode);
     if (!instantiated)
         iput(inode);
 out_budg:
     ubifs_release_budget(c, &req);
     if (!instantiated)
         ubifs_release_budget(c, &ino_req);
     fscrypt_free_filename(&nm);
     ubifs_err(c, "cannot create temporary file, error %d", err);
     return err;
 }
 
 /**
  * vfs_dent_type - get VFS directory entry type.
  * @type: UBIFS directory entry type
  *
  * This function converts UBIFS directory entry type into VFS directory entry
  * type.
  */
 static unsigned int vfs_dent_type(uint8_t type)
 {
     switch (type) {
     case UBIFS_ITYPE_REG:
         return DT_REG;
     case UBIFS_ITYPE_DIR:
         return DT_DIR;
     case UBIFS_ITYPE_LNK:
         return DT_LNK;
     case UBIFS_ITYPE_BLK:
         return DT_BLK;
     case UBIFS_ITYPE_CHR:
         return DT_CHR;
     case UBIFS_ITYPE_FIFO:
         return DT_FIFO;
     case UBIFS_ITYPE_SOCK:
         return DT_SOCK;
     default:
         BUG();
     }
     return 0;
 }
 
 /*
  * The classical Unix view for directory is that it is a linear array of
  * (name, inode number) entries. Linux/VFS assumes this model as well.
  * Particularly, 'readdir()' call wants us to return a directory entry offset
  * which later may be used to continue 'readdir()'ing the directory or to
  * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
  * model because directory entries are identified by keys, which may collide.
  *
  * UBIFS uses directory entry hash value for directory offsets, so
  * 'seekdir()'/'telldir()' may not always work because of possible key
  * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
  * properly by means of saving full directory entry name in the private field
  * of the file description object.
  *
  * This means that UBIFS cannot support NFS which requires full
  * 'seekdir()'/'telldir()' support.
  */
 static int ubifs_readdir(struct file *file, struct dir_context *ctx)
 {
     int fstr_real_len = 0, err = 0;
     struct fscrypt_name nm;
     struct fscrypt_str fstr = {0};
     union ubifs_key key;
     struct ubifs_dent_node *dent;
     struct inode *dir = file_inode(file);
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     bool encrypted = IS_ENCRYPTED(dir);
 
     dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
 
     if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
         /*
          * The directory was seek'ed to a senseless position or there
          * are no more entries.
          */
         return 0;
 
     if (encrypted) {
         err = fscrypt_prepare_readdir(dir);
         if (err)
             return err;
 
         err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr);
         if (err)
             return err;
 
         fstr_real_len = fstr.len;
     }
 
     if (file->f_version == 0) {
         /*
          * The file was seek'ed, which means that @file->private_data
          * is now invalid. This may also be just the first
          * 'ubifs_readdir()' invocation, in which case
          * @file->private_data is NULL, and the below code is
          * basically a no-op.
          */
         kfree(file->private_data);
         file->private_data = NULL;
     }
 
     /*
      * 'generic_file_llseek()' unconditionally sets @file->f_version to
      * zero, and we use this for detecting whether the file was seek'ed.
      */
     file->f_version = 1;
 
     /* File positions 0 and 1 correspond to "." and ".." */
     if (ctx->pos < 2) {
         ubifs_assert(c, !file->private_data);
         if (!dir_emit_dots(file, ctx)) {
             if (encrypted)
                 fscrypt_fname_free_buffer(&fstr);
             return 0;
         }
 
         /* Find the first entry in TNC and save it */
         lowest_dent_key(c, &key, dir->i_ino);
         fname_len(&nm) = 0;
         dent = ubifs_tnc_next_ent(c, &key, &nm);
         if (IS_ERR(dent)) {
             err = PTR_ERR(dent);
             goto out;
         }
 
         ctx->pos = key_hash_flash(c, &dent->key);
         file->private_data = dent;
     }
 
     dent = file->private_data;
     if (!dent) {
         /*
          * The directory was seek'ed to and is now readdir'ed.
          * Find the entry corresponding to @ctx->pos or the closest one.
          */
         dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
         fname_len(&nm) = 0;
         dent = ubifs_tnc_next_ent(c, &key, &nm);
         if (IS_ERR(dent)) {
             err = PTR_ERR(dent);
             goto out;
         }
         ctx->pos = key_hash_flash(c, &dent->key);
         file->private_data = dent;
     }
 
     while (1) {
         dbg_gen("ino %llu, new f_pos %#x",
             (unsigned long long)le64_to_cpu(dent->inum),
             key_hash_flash(c, &dent->key));
         ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) >
                  ubifs_inode(dir)->creat_sqnum);
 
         fname_len(&nm) = le16_to_cpu(dent->nlen);
         fname_name(&nm) = dent->name;
 
         if (encrypted) {
             fstr.len = fstr_real_len;
 
             err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c,
                             &dent->key),
                             le32_to_cpu(dent->cookie),
                             &nm.disk_name, &fstr);
             if (err)
                 goto out;
         } else {
             fstr.len = fname_len(&nm);
             fstr.name = fname_name(&nm);
         }
 
         if (!dir_emit(ctx, fstr.name, fstr.len,
                    le64_to_cpu(dent->inum),
                    vfs_dent_type(dent->type))) {
             if (encrypted)
                 fscrypt_fname_free_buffer(&fstr);
             return 0;
         }
 
         /* Switch to the next entry */
         key_read(c, &dent->key, &key);
         dent = ubifs_tnc_next_ent(c, &key, &nm);
         if (IS_ERR(dent)) {
             err = PTR_ERR(dent);
             goto out;
         }
 
         kfree(file->private_data);
         ctx->pos = key_hash_flash(c, &dent->key);
         file->private_data = dent;
         cond_resched();
     }
 
 out:
     kfree(file->private_data);
     file->private_data = NULL;
 
     if (encrypted)
         fscrypt_fname_free_buffer(&fstr);
 
     if (err != -ENOENT)
         ubifs_err(c, "cannot find next direntry, error %d", err);
     else
         /*
          * -ENOENT is a non-fatal error in this context, the TNC uses
          * it to indicate that the cursor moved past the current directory
          * and readdir() has to stop.
          */
         err = 0;
 
 
     /* 2 is a special value indicating that there are no more direntries */
     ctx->pos = 2;
     return err;
 }
 
 /* Free saved readdir() state when the directory is closed */
 static int ubifs_dir_release(struct inode *dir, struct file *file)
 {
     kfree(file->private_data);
     file->private_data = NULL;
     return 0;
 }
 
 static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
               struct dentry *dentry)
 {
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct inode *inode = d_inode(old_dentry);
     struct ubifs_inode *ui = ubifs_inode(inode);
     struct ubifs_inode *dir_ui = ubifs_inode(dir);
     int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
     struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
                 .dirtied_ino_d = ALIGN(ui->data_len, 8) };
     struct fscrypt_name nm;
 
     /*
      * Budget request settings: new direntry, changing the target inode,
      * changing the parent inode.
      */
 
     dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
         dentry, inode->i_ino,
         inode->i_nlink, dir->i_ino);
     ubifs_assert(c, inode_is_locked(dir));
     ubifs_assert(c, inode_is_locked(inode));
 
     err = fscrypt_prepare_link(old_dentry, dir, dentry);
     if (err)
         return err;
 
     err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
     if (err)
         return err;
 
     err = dbg_check_synced_i_size(c, inode);
     if (err)
         goto out_fname;
 
     err = ubifs_budget_space(c, &req);
     if (err)
         goto out_fname;
 
     lock_2_inodes(dir, inode);
 
     /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */
     if (inode->i_nlink == 0)
         ubifs_delete_orphan(c, inode->i_ino);
 
     inc_nlink(inode);
     ihold(inode);
     inode->i_ctime = current_time(inode);
     dir->i_size += sz_change;
     dir_ui->ui_size = dir->i_size;
     dir->i_mtime = dir->i_ctime = inode->i_ctime;
     err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
     if (err)
         goto out_cancel;
     unlock_2_inodes(dir, inode);
 
     ubifs_release_budget(c, &req);
     d_instantiate(dentry, inode);
     fscrypt_free_filename(&nm);
     return 0;
 
 out_cancel:
     dir->i_size -= sz_change;
     dir_ui->ui_size = dir->i_size;
     drop_nlink(inode);
     if (inode->i_nlink == 0)
         ubifs_add_orphan(c, inode->i_ino);
     unlock_2_inodes(dir, inode);
     ubifs_release_budget(c, &req);
     iput(inode);
 out_fname:
     fscrypt_free_filename(&nm);
     return err;
 }
 
 static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
 {
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct inode *inode = d_inode(dentry);
     struct ubifs_inode *dir_ui = ubifs_inode(dir);
     int err, sz_change, budgeted = 1;
     struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
     unsigned int saved_nlink = inode->i_nlink;
     struct fscrypt_name nm;
 
     /*
      * Budget request settings: deletion direntry, deletion inode (+1 for
      * @dirtied_ino), changing the parent directory inode. If budgeting
      * fails, go ahead anyway because we have extra space reserved for
      * deletions.
      */
 
     dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
         dentry, inode->i_ino,
         inode->i_nlink, dir->i_ino);
 
     err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
     if (err)
         return err;
 
     err = ubifs_purge_xattrs(inode);
     if (err)
         return err;
 
     sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
     ubifs_assert(c, inode_is_locked(dir));
     ubifs_assert(c, inode_is_locked(inode));
     err = dbg_check_synced_i_size(c, inode);
     if (err)
         goto out_fname;
 
     err = ubifs_budget_space(c, &req);
     if (err) {
         if (err != -ENOSPC)
             goto out_fname;
         budgeted = 0;
     }
 
     lock_2_inodes(dir, inode);
     inode->i_ctime = current_time(dir);
     drop_nlink(inode);
     dir->i_size -= sz_change;
     dir_ui->ui_size = dir->i_size;
     dir->i_mtime = dir->i_ctime = inode->i_ctime;
     err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
     if (err)
         goto out_cancel;
     unlock_2_inodes(dir, inode);
 
     if (budgeted)
         ubifs_release_budget(c, &req);
     else {
         /* We've deleted something - clean the "no space" flags */
         c->bi.nospace = c->bi.nospace_rp = 0;
         smp_wmb();
     }
     fscrypt_free_filename(&nm);
     return 0;
 
 out_cancel:
     dir->i_size += sz_change;
     dir_ui->ui_size = dir->i_size;
     set_nlink(inode, saved_nlink);
     unlock_2_inodes(dir, inode);
     if (budgeted)
         ubifs_release_budget(c, &req);
 out_fname:
     fscrypt_free_filename(&nm);
     return err;
 }
 
 /**
  * check_dir_empty - check if a directory is empty or not.
  * @dir: VFS inode object of the directory to check
  *
  * This function checks if directory @dir is empty. Returns zero if the
  * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
  * in case of errors.
  */
 int ubifs_check_dir_empty(struct inode *dir)
 {
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct fscrypt_name nm = { 0 };
     struct ubifs_dent_node *dent;
     union ubifs_key key;
     int err;
 
     lowest_dent_key(c, &key, dir->i_ino);
     dent = ubifs_tnc_next_ent(c, &key, &nm);
     if (IS_ERR(dent)) {
         err = PTR_ERR(dent);
         if (err == -ENOENT)
             err = 0;
     } else {
         kfree(dent);
         err = -ENOTEMPTY;
     }
     return err;
 }
 
 static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
 {
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     struct inode *inode = d_inode(dentry);
     int err, sz_change, budgeted = 1;
     struct ubifs_inode *dir_ui = ubifs_inode(dir);
     struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
     struct fscrypt_name nm;
 
     /*
      * Budget request settings: deletion direntry, deletion inode and
      * changing the parent inode. If budgeting fails, go ahead anyway
      * because we have extra space reserved for deletions.
      */
 
     dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
         inode->i_ino, dir->i_ino);
     ubifs_assert(c, inode_is_locked(dir));
     ubifs_assert(c, inode_is_locked(inode));
     err = ubifs_check_dir_empty(d_inode(dentry));
     if (err)
         return err;
 
     err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
     if (err)
         return err;
 
     err = ubifs_purge_xattrs(inode);
     if (err)
         return err;
 
     sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
     err = ubifs_budget_space(c, &req);
     if (err) {
         if (err != -ENOSPC)
             goto out_fname;
         budgeted = 0;
     }
 
     lock_2_inodes(dir, inode);
     inode->i_ctime = current_time(dir);
     clear_nlink(inode);
     drop_nlink(dir);
     dir->i_size -= sz_change;
     dir_ui->ui_size = dir->i_size;
     dir->i_mtime = dir->i_ctime = inode->i_ctime;
     err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
     if (err)
         goto out_cancel;
     unlock_2_inodes(dir, inode);
 
     if (budgeted)
         ubifs_release_budget(c, &req);
     else {
         /* We've deleted something - clean the "no space" flags */
         c->bi.nospace = c->bi.nospace_rp = 0;
         smp_wmb();
     }
     fscrypt_free_filename(&nm);
     return 0;
 
 out_cancel:
     dir->i_size += sz_change;
     dir_ui->ui_size = dir->i_size;
     inc_nlink(dir);
     set_nlink(inode, 2);
     unlock_2_inodes(dir, inode);
     if (budgeted)
         ubifs_release_budget(c, &req);
 out_fname:
     fscrypt_free_filename(&nm);
     return err;
 }
 
 static int ubifs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
                struct dentry *dentry, umode_t mode)
 {
     struct inode *inode;
     struct ubifs_inode *dir_ui = ubifs_inode(dir);
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     int err, sz_change;
     struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
                     .dirtied_ino = 1};
     struct fscrypt_name nm;
 
     /*
      * Budget request settings: new inode, new direntry and changing parent
      * directory inode.
      */
 
     dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
         dentry, mode, dir->i_ino);
 
     err = ubifs_budget_space(c, &req);
     if (err)
         return err;
 
     err = ubifs_prepare_create(dir, dentry, &nm);
     if (err)
         goto out_budg;
 
     sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
     inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
     if (IS_ERR(inode)) {
         err = PTR_ERR(inode);
         goto out_fname;
     }
 
     err = ubifs_init_security(dir, inode, &dentry->d_name);
     if (err)
         goto out_inode;
 
     mutex_lock(&dir_ui->ui_mutex);
     insert_inode_hash(inode);
     inc_nlink(inode);
     inc_nlink(dir);
     dir->i_size += sz_change;
     dir_ui->ui_size = dir->i_size;
     dir->i_mtime = dir->i_ctime = inode->i_ctime;
     err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
     if (err) {
         ubifs_err(c, "cannot create directory, error %d", err);
         goto out_cancel;
     }
     mutex_unlock(&dir_ui->ui_mutex);
 
     ubifs_release_budget(c, &req);
     d_instantiate(dentry, inode);
     fscrypt_free_filename(&nm);
     return 0;
 
 out_cancel:
     dir->i_size -= sz_change;
     dir_ui->ui_size = dir->i_size;
     drop_nlink(dir);
     mutex_unlock(&dir_ui->ui_mutex);
 out_inode:
     make_bad_inode(inode);
     iput(inode);
 out_fname:
     fscrypt_free_filename(&nm);
 out_budg:
     ubifs_release_budget(c, &req);
     return err;
 }
 
 static int ubifs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
                struct dentry *dentry, umode_t mode, dev_t rdev)
 {
     struct inode *inode;
     struct ubifs_inode *ui;
     struct ubifs_inode *dir_ui = ubifs_inode(dir);
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     union ubifs_dev_desc *dev = NULL;
     int sz_change;
     int err, devlen = 0;
     struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
                     .dirtied_ino = 1 };
     struct fscrypt_name nm;
 
     /*
      * Budget request settings: new inode, new direntry and changing parent
      * directory inode.
      */
 
     dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
 
     if (S_ISBLK(mode) || S_ISCHR(mode)) {
         dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
         if (!dev)
             return -ENOMEM;
         devlen = ubifs_encode_dev(dev, rdev);
     }
 
     req.new_ino_d = ALIGN(devlen, 8);
     err = ubifs_budget_space(c, &req);
     if (err) {
         kfree(dev);
         return err;
     }
 
     err = ubifs_prepare_create(dir, dentry, &nm);
     if (err) {
         kfree(dev);
         goto out_budg;
     }
 
     sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
     inode = ubifs_new_inode(c, dir, mode);
     if (IS_ERR(inode)) {
         kfree(dev);
         err = PTR_ERR(inode);
         goto out_fname;
     }
 
     init_special_inode(inode, inode->i_mode, rdev);
     inode->i_size = ubifs_inode(inode)->ui_size = devlen;
     ui = ubifs_inode(inode);
     ui->data = dev;
     ui->data_len = devlen;
 
     err = ubifs_init_security(dir, inode, &dentry->d_name);
     if (err)
         goto out_inode;
 
     mutex_lock(&dir_ui->ui_mutex);
     dir->i_size += sz_change;
     dir_ui->ui_size = dir->i_size;
     dir->i_mtime = dir->i_ctime = inode->i_ctime;
     err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
     if (err)
         goto out_cancel;
     mutex_unlock(&dir_ui->ui_mutex);
 
     ubifs_release_budget(c, &req);
     insert_inode_hash(inode);
     d_instantiate(dentry, inode);
     fscrypt_free_filename(&nm);
     return 0;
 
 out_cancel:
     dir->i_size -= sz_change;
     dir_ui->ui_size = dir->i_size;
     mutex_unlock(&dir_ui->ui_mutex);
 out_inode:
     make_bad_inode(inode);
     iput(inode);
 out_fname:
     fscrypt_free_filename(&nm);
 out_budg:
     ubifs_release_budget(c, &req);
     return err;
 }
 
 static int ubifs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
              struct dentry *dentry, const char *symname)
 {
     struct inode *inode;
     struct ubifs_inode *ui;
     struct ubifs_inode *dir_ui = ubifs_inode(dir);
     struct ubifs_info *c = dir->i_sb->s_fs_info;
     int err, sz_change, len = strlen(symname);
     struct fscrypt_str disk_link;
     struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
                     .new_ino_d = ALIGN(len, 8),
                     .dirtied_ino = 1 };
     struct fscrypt_name nm;
 
     dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
         symname, dir->i_ino);
 
     err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
                       &disk_link);
     if (err)
         return err;
 
     /*
      * Budget request settings: new inode, new direntry and changing parent
      * directory inode.
      */
     err = ubifs_budget_space(c, &req);
     if (err)
         return err;
 
     err = ubifs_prepare_create(dir, dentry, &nm);
     if (err)
         goto out_budg;
 
     sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
     inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
     if (IS_ERR(inode)) {
         err = PTR_ERR(inode);
         goto out_fname;
     }
 
     ui = ubifs_inode(inode);
     ui->data = kmalloc(disk_link.len, GFP_NOFS);
     if (!ui->data) {
         err = -ENOMEM;
         goto out_inode;
     }
 
     if (IS_ENCRYPTED(inode)) {
         disk_link.name = ui->data; /* encrypt directly into ui->data */
         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
         if (err)
             goto out_inode;
     } else {
         memcpy(ui->data, disk_link.name, disk_link.len);
         inode->i_link = ui->data;
     }
 
     /*
      * The terminating zero byte is not written to the flash media and it
      * is put just to make later in-memory string processing simpler. Thus,
      * data length is @disk_link.len - 1, not @disk_link.len.
      */
     ui->data_len = disk_link.len - 1;
     inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
 
     err = ubifs_init_security(dir, inode, &dentry->d_name);
     if (err)
         goto out_inode;
 
     mutex_lock(&dir_ui->ui_mutex);
     dir->i_size += sz_change;
     dir_ui->ui_size = dir->i_size;
     dir->i_mtime = dir->i_ctime = inode->i_ctime;
     err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
     if (err)
         goto out_cancel;
     mutex_unlock(&dir_ui->ui_mutex);
 
     insert_inode_hash(inode);
     d_instantiate(dentry, inode);
     err = 0;
     goto out_fname;
 
 out_cancel:
     dir->i_size -= sz_change;
     dir_ui->ui_size = dir->i_size;
     mutex_unlock(&dir_ui->ui_mutex);
 out_inode:
     make_bad_inode(inode);
     iput(inode);
 out_fname:
     fscrypt_free_filename(&nm);
 out_budg:
     ubifs_release_budget(c, &req);
     return err;
 }
 
 /**
  * lock_4_inodes - a wrapper for locking three UBIFS inodes.
  * @inode1: first inode
  * @inode2: second inode
  * @inode3: third inode
  * @inode4: fourth inode
  *
  * This function is used for 'ubifs_rename()' and @inode1 may be the same as
  * @inode2 whereas @inode3 and @inode4 may be %NULL.
  *
  * We do not implement any tricks to guarantee strict lock ordering, because
  * VFS has already done it for us on the @i_mutex. So this is just a simple
  * wrapper function.
  */
 static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
               struct inode *inode3, struct inode *inode4)
 {
     mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
     if (inode2 != inode1)
         mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
     if (inode3)
         mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
     if (inode4)
         mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
 }
 
 /**
  * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
  * @inode1: first inode
  * @inode2: second inode
  * @inode3: third inode
  * @inode4: fourth inode
  */
 static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
                 struct inode *inode3, struct inode *inode4)
 {
     if (inode4)
         mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
     if (inode3)
         mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
     if (inode1 != inode2)
         mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
     mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
 }
 
 static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
              struct inode *new_dir, struct dentry *new_dentry,
              unsigned int flags)
 {
     struct ubifs_info *c = old_dir->i_sb->s_fs_info;
     struct inode *old_inode = d_inode(old_dentry);
     struct inode *new_inode = d_inode(new_dentry);
     struct inode *whiteout = NULL;
     struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
     struct ubifs_inode *whiteout_ui = NULL;
     int err, release, sync = 0, move = (new_dir != old_dir);
     int is_dir = S_ISDIR(old_inode->i_mode);
     int unlink = !!new_inode, new_sz, old_sz;
     struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
                     .dirtied_ino = 3 };
     struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
             .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
     struct ubifs_budget_req wht_req;
     struct timespec64 time;
     unsigned int saved_nlink;
     struct fscrypt_name old_nm, new_nm;
 
     /*
      * Budget request settings:
      *   req: deletion direntry, new direntry, removing the old inode,
      *   and changing old and new parent directory inodes.
      *
      *   wht_req: new whiteout inode for RENAME_WHITEOUT.
      *
      *   ino_req: marks the target inode as dirty and does not write it.
      */
 
     dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
         old_dentry, old_inode->i_ino, old_dir->i_ino,
         new_dentry, new_dir->i_ino, flags);
 
     if (unlink) {
         ubifs_assert(c, inode_is_locked(new_inode));
 
         err = ubifs_purge_xattrs(new_inode);
         if (err)
             return err;
     }
 
     if (unlink && is_dir) {
         err = ubifs_check_dir_empty(new_inode);
         if (err)
             return err;
     }
 
     err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm);
     if (err)
         return err;
 
     err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm);
     if (err) {
         fscrypt_free_filename(&old_nm);
         return err;
     }
 
     new_sz = CALC_DENT_SIZE(fname_len(&new_nm));
     old_sz = CALC_DENT_SIZE(fname_len(&old_nm));
 
     err = ubifs_budget_space(c, &req);
     if (err) {
         fscrypt_free_filename(&old_nm);
         fscrypt_free_filename(&new_nm);
         return err;
     }
     err = ubifs_budget_space(c, &ino_req);
     if (err) {
         fscrypt_free_filename(&old_nm);
         fscrypt_free_filename(&new_nm);
         ubifs_release_budget(c, &req);
         return err;
     }
 
     if (flags & RENAME_WHITEOUT) {
         union ubifs_dev_desc *dev = NULL;
 
         dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
         if (!dev) {
             err = -ENOMEM;
             goto out_release;
         }
 
         /*
          * The whiteout inode without dentry is pinned in memory,
          * umount won't happen during rename process because we
          * got parent dentry.
          */
         whiteout = create_whiteout(old_dir, old_dentry);
         if (IS_ERR(whiteout)) {
             err = PTR_ERR(whiteout);
             kfree(dev);
             goto out_release;
         }
 
         whiteout_ui = ubifs_inode(whiteout);
         whiteout_ui->data = dev;
         whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
         ubifs_assert(c, !whiteout_ui->dirty);
 
         memset(&wht_req, 0, sizeof(struct ubifs_budget_req));
         wht_req.new_ino = 1;
         wht_req.new_ino_d = ALIGN(whiteout_ui->data_len, 8);
         /*
          * To avoid deadlock between space budget (holds ui_mutex and
          * waits wb work) and writeback work(waits ui_mutex), do space
          * budget before ubifs inodes locked.
          */
         err = ubifs_budget_space(c, &wht_req);
         if (err) {
             /*
              * Whiteout inode can not be written on flash by
              * ubifs_jnl_write_inode(), because it's neither
              * dirty nor zero-nlink.
              */
             iput(whiteout);
             goto out_release;
         }
 
         /* Add the old_dentry size to the old_dir size. */
         old_sz -= CALC_DENT_SIZE(fname_len(&old_nm));
     }
 
     lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
 
     /*
      * Like most other Unix systems, set the @i_ctime for inodes on a
      * rename.
      */
     time = current_time(old_dir);
     old_inode->i_ctime = time;
 
     /* We must adjust parent link count when renaming directories */
     if (is_dir) {
         if (move) {
             /*
              * @old_dir loses a link because we are moving
              * @old_inode to a different directory.
              */
             drop_nlink(old_dir);
             /*
              * @new_dir only gains a link if we are not also
              * overwriting an existing directory.
              */
             if (!unlink)
                 inc_nlink(new_dir);
         } else {
             /*
              * @old_inode is not moving to a different directory,
              * but @old_dir still loses a link if we are
              * overwriting an existing directory.
              */
             if (unlink)
                 drop_nlink(old_dir);
         }
     }
 
     old_dir->i_size -= old_sz;
     ubifs_inode(old_dir)->ui_size = old_dir->i_size;
     old_dir->i_mtime = old_dir->i_ctime = time;
     new_dir->i_mtime = new_dir->i_ctime = time;
 
     /*
      * And finally, if we unlinked a direntry which happened to have the
      * same name as the moved direntry, we have to decrement @i_nlink of
      * the unlinked inode and change its ctime.
      */
     if (unlink) {
         /*
          * Directories cannot have hard-links, so if this is a
          * directory, just clear @i_nlink.
          */
         saved_nlink = new_inode->i_nlink;
         if (is_dir)
             clear_nlink(new_inode);
         else
             drop_nlink(new_inode);
         new_inode->i_ctime = time;
     } else {
         new_dir->i_size += new_sz;
         ubifs_inode(new_dir)->ui_size = new_dir->i_size;
     }
 
     /*
      * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
      * is dirty, because this will be done later on at the end of
      * 'ubifs_rename()'.
      */
     if (IS_SYNC(old_inode)) {
         sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
         if (unlink && IS_SYNC(new_inode))
             sync = 1;
         /*
          * S_SYNC flag of whiteout inherits from the old_dir, and we
          * have already checked the old dir inode. So there is no need
          * to check whiteout.
          */
     }
 
     err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
                    new_inode, &new_nm, whiteout, sync);
     if (err)
         goto out_cancel;
 
     unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
     ubifs_release_budget(c, &req);
 
     if (whiteout) {
         ubifs_release_budget(c, &wht_req);
         iput(whiteout);
     }
 
     mutex_lock(&old_inode_ui->ui_mutex);
     release = old_inode_ui->dirty;
     mark_inode_dirty_sync(old_inode);
     mutex_unlock(&old_inode_ui->ui_mutex);
 
     if (release)
         ubifs_release_budget(c, &ino_req);
     if (IS_SYNC(old_inode))
         /*
          * Rename finished here. Although old inode cannot be updated
          * on flash, old ctime is not a big problem, don't return err
          * code to userspace.
          */
         old_inode->i_sb->s_op->write_inode(old_inode, NULL);
 
     fscrypt_free_filename(&old_nm);
     fscrypt_free_filename(&new_nm);
     return 0;
 
 out_cancel:
     if (unlink) {
         set_nlink(new_inode, saved_nlink);
     } else {
         new_dir->i_size -= new_sz;
         ubifs_inode(new_dir)->ui_size = new_dir->i_size;
     }
     old_dir->i_size += old_sz;
     ubifs_inode(old_dir)->ui_size = old_dir->i_size;
     if (is_dir) {
         if (move) {
             inc_nlink(old_dir);
             if (!unlink)
                 drop_nlink(new_dir);
         } else {
             if (unlink)
                 inc_nlink(old_dir);
         }
     }
     unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
     if (whiteout) {
         ubifs_release_budget(c, &wht_req);
         iput(whiteout);
     }
 out_release:
     ubifs_release_budget(c, &ino_req);
     ubifs_release_budget(c, &req);
     fscrypt_free_filename(&old_nm);
     fscrypt_free_filename(&new_nm);
     return err;
 }
 
 static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
             struct inode *new_dir, struct dentry *new_dentry)
 {
     struct ubifs_info *c = old_dir->i_sb->s_fs_info;
     struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
                 .dirtied_ino = 2 };
     int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
     struct inode *fst_inode = d_inode(old_dentry);
     struct inode *snd_inode = d_inode(new_dentry);
     struct timespec64 time;
     int err;
     struct fscrypt_name fst_nm, snd_nm;
 
     ubifs_assert(c, fst_inode && snd_inode);
 
     err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
     if (err)
         return err;
 
     err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm);
     if (err) {
         fscrypt_free_filename(&fst_nm);
         return err;
     }
 
     lock_4_inodes(old_dir, new_dir, NULL, NULL);
 
     time = current_time(old_dir);
     fst_inode->i_ctime = time;
     snd_inode->i_ctime = time;
     old_dir->i_mtime = old_dir->i_ctime = time;
     new_dir->i_mtime = new_dir->i_ctime = time;
 
     if (old_dir != new_dir) {
         if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
             inc_nlink(new_dir);
             drop_nlink(old_dir);
         }
         else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
             drop_nlink(new_dir);
             inc_nlink(old_dir);
         }
     }
 
     err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir,
                 snd_inode, &snd_nm, sync);
 
     unlock_4_inodes(old_dir, new_dir, NULL, NULL);
     ubifs_release_budget(c, &req);
 
     fscrypt_free_filename(&fst_nm);
     fscrypt_free_filename(&snd_nm);
     return err;
 }
 
 static int ubifs_rename(struct user_namespace *mnt_userns,
             struct inode *old_dir, struct dentry *old_dentry,
             struct inode *new_dir, struct dentry *new_dentry,
             unsigned int flags)
 {
     int err;
     struct ubifs_info *c = old_dir->i_sb->s_fs_info;
 
     if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
         return -EINVAL;
 
     ubifs_assert(c, inode_is_locked(old_dir));
     ubifs_assert(c, inode_is_locked(new_dir));
 
     err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
                      flags);
     if (err)
         return err;
 
     if (flags & RENAME_EXCHANGE)
         return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
 
     return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
 }
 
 int ubifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
           struct kstat *stat, u32 request_mask, unsigned int flags)
 {
     loff_t size;
     struct inode *inode = d_inode(path->dentry);
     struct ubifs_inode *ui = ubifs_inode(inode);
 
     mutex_lock(&ui->ui_mutex);
 
     if (ui->flags & UBIFS_APPEND_FL)
         stat->attributes |= STATX_ATTR_APPEND;
     if (ui->flags & UBIFS_COMPR_FL)
         stat->attributes |= STATX_ATTR_COMPRESSED;
     if (ui->flags & UBIFS_CRYPT_FL)
         stat->attributes |= STATX_ATTR_ENCRYPTED;
     if (ui->flags & UBIFS_IMMUTABLE_FL)
         stat->attributes |= STATX_ATTR_IMMUTABLE;
 
     stat->attributes_mask |= (STATX_ATTR_APPEND |
                 STATX_ATTR_COMPRESSED |
                 STATX_ATTR_ENCRYPTED |
                 STATX_ATTR_IMMUTABLE);
 
     generic_fillattr(&init_user_ns, inode, stat);
     stat->blksize = UBIFS_BLOCK_SIZE;
     stat->size = ui->ui_size;
 
     /*
      * Unfortunately, the 'stat()' system call was designed for block
      * device based file systems, and it is not appropriate for UBIFS,
      * because UBIFS does not have notion of "block". For example, it is
      * difficult to tell how many block a directory takes - it actually
      * takes less than 300 bytes, but we have to round it to block size,
      * which introduces large mistake. This makes utilities like 'du' to
      * report completely senseless numbers. This is the reason why UBIFS
      * goes the same way as JFFS2 - it reports zero blocks for everything
      * but regular files, which makes more sense than reporting completely
      * wrong sizes.
      */
     if (S_ISREG(inode->i_mode)) {
         size = ui->xattr_size;
         size += stat->size;
         size = ALIGN(size, UBIFS_BLOCK_SIZE);
         /*
          * Note, user-space expects 512-byte blocks count irrespectively
          * of what was reported in @stat->size.
          */
         stat->blocks = size >> 9;
     } else
         stat->blocks = 0;
     mutex_unlock(&ui->ui_mutex);
     return 0;
 }
 
 const struct inode_operations ubifs_dir_inode_operations = {
     .lookup      = ubifs_lookup,
     .create      = ubifs_create,
     .link        = ubifs_link,
     .symlink     = ubifs_symlink,
     .unlink      = ubifs_unlink,
     .mkdir       = ubifs_mkdir,
     .rmdir       = ubifs_rmdir,
     .mknod       = ubifs_mknod,
     .rename      = ubifs_rename,
     .setattr     = ubifs_setattr,
     .getattr     = ubifs_getattr,
     .listxattr   = ubifs_listxattr,
     .update_time = ubifs_update_time,
     .tmpfile     = ubifs_tmpfile,
     .fileattr_get = ubifs_fileattr_get,
     .fileattr_set = ubifs_fileattr_set,
 };
 
 const struct file_operations ubifs_dir_operations = {
     .llseek         = generic_file_llseek,
     .release        = ubifs_dir_release,
     .read           = generic_read_dir,
     .iterate_shared = ubifs_readdir,
     .fsync          = ubifs_fsync,
     .unlocked_ioctl = ubifs_ioctl,
 #ifdef CONFIG_COMPAT
     .compat_ioctl   = ubifs_compat_ioctl,
 #endif
 };

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