![Dongsheng Yang](/assets/img/avatar_default.png)
To make ubifs support atime flexily, this commit introduces a Kconfig option named as UBIFS_ATIME_SUPPORT. With UBIFS_ATIME_SUPPORT=n: ubifs keeps the full compatibility to no_atime from the start of ubifs. =================UBIFS_ATIME_SUPPORT=n======================= -o - no atime -o atime - no atime -o noatime - no atime -o relatime - no atime -o strictatime - no atime -o lazyatime - no atime With UBIFS_ATIME_SUPPORT=y: ubifs supports the atime same with other main stream file systems. =================UBIFS_ATIME_SUPPORT=y======================= -o - default behavior (relatime currently) -o atime - atime support -o noatime - no atime support -o relatime - relative atime support -o strictatime - strict atime support -o lazyatime - lazy atime support Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Richard Weinberger <richard@nod.at>
1205 lines
32 KiB
C
1205 lines
32 KiB
C
/* * This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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* Copyright (C) 2006, 2007 University of Szeged, Hungary
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors: Artem Bityutskiy (Битюцкий Артём)
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* Adrian Hunter
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* Zoltan Sogor
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*/
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/*
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* This file implements directory operations.
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*
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* All FS operations in this file allocate budget before writing anything to the
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* media. If they fail to allocate it, the error is returned. The only
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* exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
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* if they unable to allocate the budget, because deletion %-ENOSPC failure is
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* not what users are usually ready to get. UBIFS budgeting subsystem has some
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* space reserved for these purposes.
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*
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* All operations in this file write all inodes which they change straight
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* away, instead of marking them dirty. For example, 'ubifs_link()' changes
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* @i_size of the parent inode and writes the parent inode together with the
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* target inode. This was done to simplify file-system recovery which would
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* otherwise be very difficult to do. The only exception is rename which marks
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* the re-named inode dirty (because its @i_ctime is updated) but does not
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* write it, but just marks it as dirty.
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*/
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#include "ubifs.h"
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/**
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* inherit_flags - inherit flags of the parent inode.
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* @dir: parent inode
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* @mode: new inode mode flags
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*
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* This is a helper function for 'ubifs_new_inode()' which inherits flag of the
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* parent directory inode @dir. UBIFS inodes inherit the following flags:
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* o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
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* sub-directory basis;
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* o %UBIFS_SYNC_FL - useful for the same reasons;
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* o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
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*
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* This function returns the inherited flags.
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*/
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static int inherit_flags(const struct inode *dir, umode_t mode)
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{
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int flags;
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const struct ubifs_inode *ui = ubifs_inode(dir);
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if (!S_ISDIR(dir->i_mode))
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/*
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* The parent is not a directory, which means that an extended
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* attribute inode is being created. No flags.
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*/
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return 0;
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flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
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if (!S_ISDIR(mode))
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/* The "DIRSYNC" flag only applies to directories */
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flags &= ~UBIFS_DIRSYNC_FL;
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return flags;
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}
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/**
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* ubifs_new_inode - allocate new UBIFS inode object.
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* @c: UBIFS file-system description object
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* @dir: parent directory inode
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* @mode: inode mode flags
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*
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* This function finds an unused inode number, allocates new inode and
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* initializes it. Returns new inode in case of success and an error code in
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* case of failure.
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*/
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struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
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umode_t mode)
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{
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struct inode *inode;
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struct ubifs_inode *ui;
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inode = new_inode(c->vfs_sb);
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ui = ubifs_inode(inode);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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/*
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* Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
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* marking them dirty in file write path (see 'file_update_time()').
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* UBIFS has to fully control "clean <-> dirty" transitions of inodes
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* to make budgeting work.
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*/
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inode->i_flags |= S_NOCMTIME;
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inode_init_owner(inode, dir, mode);
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inode->i_mtime = inode->i_atime = inode->i_ctime =
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ubifs_current_time(inode);
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inode->i_mapping->nrpages = 0;
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switch (mode & S_IFMT) {
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case S_IFREG:
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inode->i_mapping->a_ops = &ubifs_file_address_operations;
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inode->i_op = &ubifs_file_inode_operations;
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inode->i_fop = &ubifs_file_operations;
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break;
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case S_IFDIR:
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inode->i_op = &ubifs_dir_inode_operations;
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inode->i_fop = &ubifs_dir_operations;
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inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
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break;
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case S_IFLNK:
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inode->i_op = &ubifs_symlink_inode_operations;
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break;
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case S_IFSOCK:
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case S_IFIFO:
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case S_IFBLK:
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case S_IFCHR:
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inode->i_op = &ubifs_file_inode_operations;
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break;
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default:
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BUG();
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}
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ui->flags = inherit_flags(dir, mode);
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ubifs_set_inode_flags(inode);
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if (S_ISREG(mode))
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ui->compr_type = c->default_compr;
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else
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ui->compr_type = UBIFS_COMPR_NONE;
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ui->synced_i_size = 0;
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spin_lock(&c->cnt_lock);
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/* Inode number overflow is currently not supported */
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if (c->highest_inum >= INUM_WARN_WATERMARK) {
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if (c->highest_inum >= INUM_WATERMARK) {
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spin_unlock(&c->cnt_lock);
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ubifs_err(c, "out of inode numbers");
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make_bad_inode(inode);
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iput(inode);
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return ERR_PTR(-EINVAL);
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}
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ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
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(unsigned long)c->highest_inum, INUM_WATERMARK);
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}
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inode->i_ino = ++c->highest_inum;
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/*
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* The creation sequence number remains with this inode for its
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* lifetime. All nodes for this inode have a greater sequence number,
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* and so it is possible to distinguish obsolete nodes belonging to a
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* previous incarnation of the same inode number - for example, for the
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* purpose of rebuilding the index.
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*/
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ui->creat_sqnum = ++c->max_sqnum;
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spin_unlock(&c->cnt_lock);
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return inode;
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}
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static int dbg_check_name(const struct ubifs_info *c,
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const struct ubifs_dent_node *dent,
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const struct qstr *nm)
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{
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if (!dbg_is_chk_gen(c))
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return 0;
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if (le16_to_cpu(dent->nlen) != nm->len)
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return -EINVAL;
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if (memcmp(dent->name, nm->name, nm->len))
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return -EINVAL;
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return 0;
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}
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static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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int err;
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union ubifs_key key;
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struct inode *inode = NULL;
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struct ubifs_dent_node *dent;
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struct ubifs_info *c = dir->i_sb->s_fs_info;
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dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
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if (dentry->d_name.len > UBIFS_MAX_NLEN)
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return ERR_PTR(-ENAMETOOLONG);
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dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
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if (!dent)
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return ERR_PTR(-ENOMEM);
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dent_key_init(c, &key, dir->i_ino, &dentry->d_name);
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err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name);
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if (err) {
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if (err == -ENOENT) {
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dbg_gen("not found");
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goto done;
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}
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goto out;
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}
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if (dbg_check_name(c, dent, &dentry->d_name)) {
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err = -EINVAL;
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goto out;
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}
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inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
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if (IS_ERR(inode)) {
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/*
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* This should not happen. Probably the file-system needs
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* checking.
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*/
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err = PTR_ERR(inode);
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ubifs_err(c, "dead directory entry '%pd', error %d",
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dentry, err);
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ubifs_ro_mode(c, err);
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goto out;
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}
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done:
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kfree(dent);
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/*
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* Note, d_splice_alias() would be required instead if we supported
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* NFS.
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*/
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d_add(dentry, inode);
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return NULL;
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out:
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kfree(dent);
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return ERR_PTR(err);
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}
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static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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bool excl)
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{
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struct inode *inode;
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struct ubifs_info *c = dir->i_sb->s_fs_info;
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int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
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struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
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.dirtied_ino = 1 };
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struct ubifs_inode *dir_ui = ubifs_inode(dir);
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/*
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* Budget request settings: new inode, new direntry, changing the
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* parent directory inode.
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*/
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dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
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dentry, mode, dir->i_ino);
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err = ubifs_budget_space(c, &req);
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if (err)
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return err;
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inode = ubifs_new_inode(c, dir, mode);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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goto out_budg;
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}
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err = ubifs_init_security(dir, inode, &dentry->d_name);
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if (err)
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goto out_inode;
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mutex_lock(&dir_ui->ui_mutex);
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dir->i_size += sz_change;
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dir_ui->ui_size = dir->i_size;
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dir->i_mtime = dir->i_ctime = inode->i_ctime;
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err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
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if (err)
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goto out_cancel;
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mutex_unlock(&dir_ui->ui_mutex);
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ubifs_release_budget(c, &req);
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insert_inode_hash(inode);
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d_instantiate(dentry, inode);
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return 0;
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out_cancel:
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dir->i_size -= sz_change;
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dir_ui->ui_size = dir->i_size;
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mutex_unlock(&dir_ui->ui_mutex);
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out_inode:
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make_bad_inode(inode);
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iput(inode);
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out_budg:
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ubifs_release_budget(c, &req);
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ubifs_err(c, "cannot create regular file, error %d", err);
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return err;
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}
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/**
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* vfs_dent_type - get VFS directory entry type.
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* @type: UBIFS directory entry type
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*
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* This function converts UBIFS directory entry type into VFS directory entry
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* type.
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*/
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static unsigned int vfs_dent_type(uint8_t type)
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{
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switch (type) {
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case UBIFS_ITYPE_REG:
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return DT_REG;
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case UBIFS_ITYPE_DIR:
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return DT_DIR;
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case UBIFS_ITYPE_LNK:
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return DT_LNK;
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case UBIFS_ITYPE_BLK:
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return DT_BLK;
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case UBIFS_ITYPE_CHR:
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return DT_CHR;
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case UBIFS_ITYPE_FIFO:
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return DT_FIFO;
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case UBIFS_ITYPE_SOCK:
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return DT_SOCK;
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default:
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BUG();
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}
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return 0;
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}
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/*
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* The classical Unix view for directory is that it is a linear array of
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* (name, inode number) entries. Linux/VFS assumes this model as well.
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* Particularly, 'readdir()' call wants us to return a directory entry offset
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* which later may be used to continue 'readdir()'ing the directory or to
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* 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
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* model because directory entries are identified by keys, which may collide.
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*
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* UBIFS uses directory entry hash value for directory offsets, so
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* 'seekdir()'/'telldir()' may not always work because of possible key
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* collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
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* properly by means of saving full directory entry name in the private field
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* of the file description object.
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*
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* This means that UBIFS cannot support NFS which requires full
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* 'seekdir()'/'telldir()' support.
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*/
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static int ubifs_readdir(struct file *file, struct dir_context *ctx)
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{
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int err;
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struct qstr nm;
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union ubifs_key key;
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struct ubifs_dent_node *dent;
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struct inode *dir = file_inode(file);
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struct ubifs_info *c = dir->i_sb->s_fs_info;
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dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
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if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
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/*
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* The directory was seek'ed to a senseless position or there
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* are no more entries.
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*/
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return 0;
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if (file->f_version == 0) {
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/*
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* The file was seek'ed, which means that @file->private_data
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* is now invalid. This may also be just the first
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* 'ubifs_readdir()' invocation, in which case
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* @file->private_data is NULL, and the below code is
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* basically a no-op.
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*/
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kfree(file->private_data);
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file->private_data = NULL;
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}
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/*
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* 'generic_file_llseek()' unconditionally sets @file->f_version to
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* zero, and we use this for detecting whether the file was seek'ed.
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*/
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file->f_version = 1;
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/* File positions 0 and 1 correspond to "." and ".." */
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if (ctx->pos < 2) {
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ubifs_assert(!file->private_data);
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if (!dir_emit_dots(file, ctx))
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return 0;
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/* Find the first entry in TNC and save it */
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lowest_dent_key(c, &key, dir->i_ino);
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nm.name = NULL;
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dent = ubifs_tnc_next_ent(c, &key, &nm);
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if (IS_ERR(dent)) {
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err = PTR_ERR(dent);
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goto out;
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}
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ctx->pos = key_hash_flash(c, &dent->key);
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file->private_data = dent;
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}
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dent = file->private_data;
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if (!dent) {
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/*
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* The directory was seek'ed to and is now readdir'ed.
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* Find the entry corresponding to @ctx->pos or the closest one.
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*/
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dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
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nm.name = NULL;
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dent = ubifs_tnc_next_ent(c, &key, &nm);
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if (IS_ERR(dent)) {
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err = PTR_ERR(dent);
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goto out;
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}
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ctx->pos = key_hash_flash(c, &dent->key);
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file->private_data = dent;
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}
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while (1) {
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dbg_gen("feed '%s', ino %llu, new f_pos %#x",
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dent->name, (unsigned long long)le64_to_cpu(dent->inum),
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key_hash_flash(c, &dent->key));
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ubifs_assert(le64_to_cpu(dent->ch.sqnum) >
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ubifs_inode(dir)->creat_sqnum);
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nm.len = le16_to_cpu(dent->nlen);
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if (!dir_emit(ctx, dent->name, nm.len,
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le64_to_cpu(dent->inum),
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vfs_dent_type(dent->type)))
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return 0;
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|
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/* Switch to the next entry */
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key_read(c, &dent->key, &key);
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nm.name = dent->name;
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dent = ubifs_tnc_next_ent(c, &key, &nm);
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if (IS_ERR(dent)) {
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err = PTR_ERR(dent);
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goto out;
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}
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kfree(file->private_data);
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ctx->pos = key_hash_flash(c, &dent->key);
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file->private_data = dent;
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cond_resched();
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}
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out:
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kfree(file->private_data);
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file->private_data = NULL;
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if (err != -ENOENT) {
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ubifs_err(c, "cannot find next direntry, error %d", err);
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return err;
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}
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/* 2 is a special value indicating that there are no more direntries */
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ctx->pos = 2;
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return 0;
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}
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|
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/* Free saved readdir() state when the directory is closed */
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static int ubifs_dir_release(struct inode *dir, struct file *file)
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{
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kfree(file->private_data);
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file->private_data = NULL;
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return 0;
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}
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|
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/**
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* lock_2_inodes - a wrapper for locking two UBIFS inodes.
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* @inode1: first inode
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* @inode2: second inode
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*
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* We do not implement any tricks to guarantee strict lock ordering, because
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* VFS has already done it for us on the @i_mutex. So this is just a simple
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* wrapper function.
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|
*/
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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_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) };
|
|
|
|
/*
|
|
* 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(mutex_is_locked(&dir->i_mutex));
|
|
ubifs_assert(mutex_is_locked(&inode->i_mutex));
|
|
|
|
err = dbg_check_synced_i_size(c, inode);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err)
|
|
return err;
|
|
|
|
lock_2_inodes(dir, inode);
|
|
inc_nlink(inode);
|
|
ihold(inode);
|
|
inode->i_ctime = ubifs_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, &dentry->d_name, inode, 0, 0);
|
|
if (err)
|
|
goto out_cancel;
|
|
unlock_2_inodes(dir, inode);
|
|
|
|
ubifs_release_budget(c, &req);
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
|
|
out_cancel:
|
|
dir->i_size -= sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
drop_nlink(inode);
|
|
unlock_2_inodes(dir, inode);
|
|
ubifs_release_budget(c, &req);
|
|
iput(inode);
|
|
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 sz_change = CALC_DENT_SIZE(dentry->d_name.len);
|
|
int err, budgeted = 1;
|
|
struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
|
|
unsigned int saved_nlink = inode->i_nlink;
|
|
|
|
/*
|
|
* 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);
|
|
ubifs_assert(mutex_is_locked(&dir->i_mutex));
|
|
ubifs_assert(mutex_is_locked(&inode->i_mutex));
|
|
err = dbg_check_synced_i_size(c, inode);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
if (err != -ENOSPC)
|
|
return err;
|
|
budgeted = 0;
|
|
}
|
|
|
|
lock_2_inodes(dir, inode);
|
|
inode->i_ctime = ubifs_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, &dentry->d_name, 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();
|
|
}
|
|
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);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* check_dir_empty - check if a directory is empty or not.
|
|
* @c: UBIFS file-system description object
|
|
* @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 of errors.
|
|
*/
|
|
static int check_dir_empty(struct ubifs_info *c, struct inode *dir)
|
|
{
|
|
struct qstr nm = { .name = NULL };
|
|
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 sz_change = CALC_DENT_SIZE(dentry->d_name.len);
|
|
int err, budgeted = 1;
|
|
struct ubifs_inode *dir_ui = ubifs_inode(dir);
|
|
struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
|
|
|
|
/*
|
|
* 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(mutex_is_locked(&dir->i_mutex));
|
|
ubifs_assert(mutex_is_locked(&inode->i_mutex));
|
|
err = check_dir_empty(c, d_inode(dentry));
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
if (err != -ENOSPC)
|
|
return err;
|
|
budgeted = 0;
|
|
}
|
|
|
|
lock_2_inodes(dir, inode);
|
|
inode->i_ctime = ubifs_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, &dentry->d_name, 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();
|
|
}
|
|
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);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_mkdir(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 = CALC_DENT_SIZE(dentry->d_name.len);
|
|
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
|
|
|
|
/*
|
|
* 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;
|
|
|
|
inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_budg;
|
|
}
|
|
|
|
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, &dentry->d_name, 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);
|
|
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_budg:
|
|
ubifs_release_budget(c, &req);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_mknod(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 = CALC_DENT_SIZE(dentry->d_name.len);
|
|
int err, devlen = 0;
|
|
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
|
|
.new_ino_d = ALIGN(devlen, 8),
|
|
.dirtied_ino = 1 };
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
kfree(dev);
|
|
return err;
|
|
}
|
|
|
|
inode = ubifs_new_inode(c, dir, mode);
|
|
if (IS_ERR(inode)) {
|
|
kfree(dev);
|
|
err = PTR_ERR(inode);
|
|
goto out_budg;
|
|
}
|
|
|
|
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, &dentry->d_name, 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);
|
|
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_budg:
|
|
ubifs_release_budget(c, &req);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_symlink(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, len = strlen(symname);
|
|
int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
|
|
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
|
|
.new_ino_d = ALIGN(len, 8),
|
|
.dirtied_ino = 1 };
|
|
|
|
/*
|
|
* Budget request settings: new inode, new direntry and changing parent
|
|
* directory inode.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
|
|
symname, dir->i_ino);
|
|
|
|
if (len > UBIFS_MAX_INO_DATA)
|
|
return -ENAMETOOLONG;
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err)
|
|
return err;
|
|
|
|
inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_budg;
|
|
}
|
|
|
|
ui = ubifs_inode(inode);
|
|
ui->data = kmalloc(len + 1, GFP_NOFS);
|
|
if (!ui->data) {
|
|
err = -ENOMEM;
|
|
goto out_inode;
|
|
}
|
|
|
|
memcpy(ui->data, symname, len);
|
|
((char *)ui->data)[len] = '\0';
|
|
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 @len, not @len + %1.
|
|
*/
|
|
ui->data_len = len;
|
|
inode->i_size = ubifs_inode(inode)->ui_size = len;
|
|
|
|
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, &dentry->d_name, 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);
|
|
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_budg:
|
|
ubifs_release_budget(c, &req);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* lock_3_inodes - a wrapper for locking three UBIFS inodes.
|
|
* @inode1: first inode
|
|
* @inode2: second inode
|
|
* @inode3: third inode
|
|
*
|
|
* This function is used for 'ubifs_rename()' and @inode1 may be the same as
|
|
* @inode2 whereas @inode3 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_3_inodes(struct inode *inode1, struct inode *inode2,
|
|
struct inode *inode3)
|
|
{
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
|
|
* @inode1: first inode
|
|
* @inode2: second inode
|
|
* @inode3: third inode
|
|
*/
|
|
static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
|
|
struct inode *inode3)
|
|
{
|
|
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 ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
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struct inode *new_dir, struct dentry *new_dentry)
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{
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struct ubifs_info *c = old_dir->i_sb->s_fs_info;
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struct inode *old_inode = d_inode(old_dentry);
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struct inode *new_inode = d_inode(new_dentry);
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struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
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int err, release, sync = 0, move = (new_dir != old_dir);
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int is_dir = S_ISDIR(old_inode->i_mode);
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int unlink = !!new_inode;
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int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len);
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int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len);
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struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
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.dirtied_ino = 3 };
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struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
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.dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
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struct timespec time;
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unsigned int uninitialized_var(saved_nlink);
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/*
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* Budget request settings: deletion direntry, new direntry, removing
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* the old inode, and changing old and new parent directory inodes.
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*
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* However, this operation also marks the target inode as dirty and
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* does not write it, so we allocate budget for the target inode
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* separately.
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*/
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dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu",
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old_dentry, old_inode->i_ino, old_dir->i_ino,
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new_dentry, new_dir->i_ino);
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ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
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ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
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if (unlink)
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ubifs_assert(mutex_is_locked(&new_inode->i_mutex));
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if (unlink && is_dir) {
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err = check_dir_empty(c, new_inode);
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if (err)
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return err;
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}
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err = ubifs_budget_space(c, &req);
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if (err)
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return err;
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err = ubifs_budget_space(c, &ino_req);
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if (err) {
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ubifs_release_budget(c, &req);
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return err;
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}
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lock_3_inodes(old_dir, new_dir, new_inode);
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/*
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* Like most other Unix systems, set the @i_ctime for inodes on a
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* rename.
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*/
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time = ubifs_current_time(old_dir);
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old_inode->i_ctime = time;
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/* We must adjust parent link count when renaming directories */
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if (is_dir) {
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if (move) {
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/*
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* @old_dir loses a link because we are moving
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* @old_inode to a different directory.
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*/
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drop_nlink(old_dir);
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/*
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* @new_dir only gains a link if we are not also
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* overwriting an existing directory.
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*/
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if (!unlink)
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inc_nlink(new_dir);
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} else {
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/*
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* @old_inode is not moving to a different directory,
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* but @old_dir still loses a link if we are
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* overwriting an existing directory.
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*/
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if (unlink)
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drop_nlink(old_dir);
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}
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}
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old_dir->i_size -= old_sz;
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ubifs_inode(old_dir)->ui_size = old_dir->i_size;
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old_dir->i_mtime = old_dir->i_ctime = time;
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new_dir->i_mtime = new_dir->i_ctime = time;
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/*
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* And finally, if we unlinked a direntry which happened to have the
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* same name as the moved direntry, we have to decrement @i_nlink of
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* the unlinked inode and change its ctime.
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*/
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if (unlink) {
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/*
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* Directories cannot have hard-links, so if this is a
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* directory, just clear @i_nlink.
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*/
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saved_nlink = new_inode->i_nlink;
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if (is_dir)
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clear_nlink(new_inode);
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else
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drop_nlink(new_inode);
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new_inode->i_ctime = time;
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} else {
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new_dir->i_size += new_sz;
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ubifs_inode(new_dir)->ui_size = new_dir->i_size;
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}
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/*
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* Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
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* is dirty, because this will be done later on at the end of
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* 'ubifs_rename()'.
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*/
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if (IS_SYNC(old_inode)) {
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sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
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if (unlink && IS_SYNC(new_inode))
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sync = 1;
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}
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err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry,
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sync);
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if (err)
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goto out_cancel;
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unlock_3_inodes(old_dir, new_dir, new_inode);
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ubifs_release_budget(c, &req);
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mutex_lock(&old_inode_ui->ui_mutex);
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release = old_inode_ui->dirty;
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mark_inode_dirty_sync(old_inode);
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mutex_unlock(&old_inode_ui->ui_mutex);
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if (release)
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ubifs_release_budget(c, &ino_req);
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if (IS_SYNC(old_inode))
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err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);
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return err;
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out_cancel:
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if (unlink) {
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set_nlink(new_inode, saved_nlink);
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} else {
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new_dir->i_size -= new_sz;
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ubifs_inode(new_dir)->ui_size = new_dir->i_size;
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}
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old_dir->i_size += old_sz;
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ubifs_inode(old_dir)->ui_size = old_dir->i_size;
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if (is_dir) {
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if (move) {
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inc_nlink(old_dir);
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if (!unlink)
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drop_nlink(new_dir);
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} else {
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if (unlink)
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inc_nlink(old_dir);
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}
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}
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unlock_3_inodes(old_dir, new_dir, new_inode);
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ubifs_release_budget(c, &ino_req);
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ubifs_release_budget(c, &req);
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return err;
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}
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int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
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struct kstat *stat)
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{
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loff_t size;
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struct inode *inode = d_inode(dentry);
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struct ubifs_inode *ui = ubifs_inode(inode);
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mutex_lock(&ui->ui_mutex);
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generic_fillattr(inode, stat);
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stat->blksize = UBIFS_BLOCK_SIZE;
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stat->size = ui->ui_size;
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/*
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* Unfortunately, the 'stat()' system call was designed for block
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* device based file systems, and it is not appropriate for UBIFS,
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* because UBIFS does not have notion of "block". For example, it is
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* difficult to tell how many block a directory takes - it actually
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* takes less than 300 bytes, but we have to round it to block size,
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* which introduces large mistake. This makes utilities like 'du' to
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* report completely senseless numbers. This is the reason why UBIFS
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* goes the same way as JFFS2 - it reports zero blocks for everything
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* but regular files, which makes more sense than reporting completely
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* wrong sizes.
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*/
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if (S_ISREG(inode->i_mode)) {
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size = ui->xattr_size;
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size += stat->size;
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size = ALIGN(size, UBIFS_BLOCK_SIZE);
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/*
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* Note, user-space expects 512-byte blocks count irrespectively
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* of what was reported in @stat->size.
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*/
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stat->blocks = size >> 9;
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} else
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stat->blocks = 0;
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mutex_unlock(&ui->ui_mutex);
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return 0;
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}
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const struct inode_operations ubifs_dir_inode_operations = {
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.lookup = ubifs_lookup,
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.create = ubifs_create,
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.link = ubifs_link,
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.symlink = ubifs_symlink,
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.unlink = ubifs_unlink,
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.mkdir = ubifs_mkdir,
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.rmdir = ubifs_rmdir,
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.mknod = ubifs_mknod,
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.rename = ubifs_rename,
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.setattr = ubifs_setattr,
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.getattr = ubifs_getattr,
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.setxattr = ubifs_setxattr,
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.getxattr = ubifs_getxattr,
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.listxattr = ubifs_listxattr,
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.removexattr = ubifs_removexattr,
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#ifdef CONFIG_UBIFS_ATIME_SUPPORT
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.update_time = ubifs_update_time,
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#endif
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};
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const struct file_operations ubifs_dir_operations = {
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.llseek = generic_file_llseek,
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.release = ubifs_dir_release,
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.read = generic_read_dir,
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.iterate = ubifs_readdir,
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.fsync = ubifs_fsync,
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.unlocked_ioctl = ubifs_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = ubifs_compat_ioctl,
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#endif
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};
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