dir.c 33.3 KB
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/* * This file is part of UBIFS.
 *
 * Copyright (C) 2006-2008 Nokia Corporation.
 * Copyright (C) 2006, 2007 University of Szeged, Hungary
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * 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, int 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, const struct inode *dir,
			      int mode)
{
	struct inode *inode;
	struct ubifs_inode *ui;

	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);

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	inode->i_uid = current_fsuid();
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	if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else
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		inode->i_gid = current_fsgid();
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	inode->i_mode = mode;
	inode->i_mtime = inode->i_atime = inode->i_ctime =
			 ubifs_current_time(inode);
	inode->i_mapping->nrpages = 0;
	/* Disable readahead */
	inode->i_mapping->backing_dev_info = &c->bdi;

	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("out of inode numbers");
			make_bad_inode(inode);
			iput(inode);
			return ERR_PTR(-EINVAL);
		}
		ubifs_warn("running out of inode numbers (current %lu, max %d)",
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			   (unsigned long)c->highest_inum, INUM_WATERMARK);
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	}

	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);
	return inode;
}

#ifdef CONFIG_UBIFS_FS_DEBUG

static int dbg_check_name(struct ubifs_dent_node *dent, struct qstr *nm)
{
	if (!(ubifs_chk_flags & UBIFS_CHK_GEN))
		return 0;
	if (le16_to_cpu(dent->nlen) != nm->len)
		return -EINVAL;
	if (memcmp(dent->name, nm->name, nm->len))
		return -EINVAL;
	return 0;
}

#else

#define dbg_check_name(dent, nm) 0

#endif

static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
				   struct nameidata *nd)
{
	int err;
	union ubifs_key key;
	struct inode *inode = NULL;
	struct ubifs_dent_node *dent;
	struct ubifs_info *c = dir->i_sb->s_fs_info;

	dbg_gen("'%.*s' in dir ino %lu",
		dentry->d_name.len, dentry->d_name.name, dir->i_ino);

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

	dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
	if (!dent)
		return ERR_PTR(-ENOMEM);

	dent_key_init(c, &key, dir->i_ino, &dentry->d_name);

	err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name);
	if (err) {
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		if (err == -ENOENT) {
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			dbg_gen("not found");
			goto done;
		}
		goto out;
	}

	if (dbg_check_name(dent, &dentry->d_name)) {
		err = -EINVAL;
		goto out;
	}

	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("dead directory entry '%.*s', error %d",
			  dentry->d_name.len, dentry->d_name.name, err);
		ubifs_ro_mode(c, err);
		goto out;
	}

done:
	kfree(dent);
	/*
	 * Note, d_splice_alias() would be required instead if we supported
	 * NFS.
	 */
	d_add(dentry, inode);
	return NULL;

out:
	kfree(dent);
	return ERR_PTR(err);
}

static int ubifs_create(struct inode *dir, struct dentry *dentry, int mode,
			struct nameidata *nd)
{
	struct inode *inode;
	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,
					.dirtied_ino = 1 };
	struct ubifs_inode *dir_ui = ubifs_inode(dir);

	/*
	 * Budget request settings: new inode, new direntry, changing the
	 * parent directory inode.
	 */

	dbg_gen("dent '%.*s', mode %#x in dir ino %lu",
		dentry->d_name.len, dentry->d_name.name, mode, dir->i_ino);

	err = ubifs_budget_space(c, &req);
	if (err)
		return err;

	inode = ubifs_new_inode(c, dir, mode);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto out_budg;
	}

	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);
	make_bad_inode(inode);
	iput(inode);
out_budg:
	ubifs_release_budget(c, &req);
	ubifs_err("cannot create regular 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, void *dirent, filldir_t filldir)
{
	int err, over = 0;
	struct qstr nm;
	union ubifs_key key;
	struct ubifs_dent_node *dent;
	struct inode *dir = file->f_path.dentry->d_inode;
	struct ubifs_info *c = dir->i_sb->s_fs_info;

	dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);

	if (file->f_pos > UBIFS_S_KEY_HASH_MASK || file->f_pos == 2)
		/*
		 * The directory was seek'ed to a senseless position or there
		 * are no more entries.
		 */
		return 0;

	/* File positions 0 and 1 correspond to "." and ".." */
	if (file->f_pos == 0) {
		ubifs_assert(!file->private_data);
		over = filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR);
		if (over)
			return 0;
		file->f_pos = 1;
	}

	if (file->f_pos == 1) {
		ubifs_assert(!file->private_data);
		over = filldir(dirent, "..", 2, 1,
			       parent_ino(file->f_path.dentry), DT_DIR);
		if (over)
			return 0;

		/* Find the first entry in TNC and save it */
		lowest_dent_key(c, &key, dir->i_ino);
		nm.name = NULL;
		dent = ubifs_tnc_next_ent(c, &key, &nm);
		if (IS_ERR(dent)) {
			err = PTR_ERR(dent);
			goto out;
		}

		file->f_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 @file->f_pos or the
		 * closest one.
		 */
		dent_key_init_hash(c, &key, dir->i_ino, file->f_pos);
		nm.name = NULL;
		dent = ubifs_tnc_next_ent(c, &key, &nm);
		if (IS_ERR(dent)) {
			err = PTR_ERR(dent);
			goto out;
		}
		file->f_pos = key_hash_flash(c, &dent->key);
		file->private_data = dent;
	}

	while (1) {
		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) >
			     ubifs_inode(dir)->creat_sqnum);
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		nm.len = le16_to_cpu(dent->nlen);
		over = filldir(dirent, dent->name, nm.len, file->f_pos,
			       le64_to_cpu(dent->inum),
			       vfs_dent_type(dent->type));
		if (over)
			return 0;

		/* Switch to the next entry */
		key_read(c, &dent->key, &key);
		nm.name = dent->name;
		dent = ubifs_tnc_next_ent(c, &key, &nm);
		if (IS_ERR(dent)) {
			err = PTR_ERR(dent);
			goto out;
		}

		kfree(file->private_data);
		file->f_pos = key_hash_flash(c, &dent->key);
		file->private_data = dent;
		cond_resched();
	}

out:
	if (err != -ENOENT) {
		ubifs_err("cannot find next direntry, error %d", err);
		return err;
	}

	kfree(file->private_data);
	file->private_data = NULL;
	file->f_pos = 2;
	return 0;
}

/* If a directory is seeked, we have to free saved readdir() state */
static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int origin)
{
	kfree(file->private_data);
	file->private_data = NULL;
	return generic_file_llseek(file, offset, origin);
}

/* 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;
}

/**
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 * lock_2_inodes - a wrapper for locking two UBIFS inodes.
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 * @inode1: first inode
 * @inode2: second inode
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 *
 * 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.
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 */
static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
{
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	mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
	mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
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}

/**
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 * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
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 * @inode1: first inode
 * @inode2: second inode
 */
static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
{
	mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
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	mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
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}

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 = old_dentry->d_inode;
	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,
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				.dirtied_ino_d = ALIGN(ui->data_len, 8) };
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	/*
	 * Budget request settings: new direntry, changing the target inode,
	 * changing the parent inode.
	 */

	dbg_gen("dent '%.*s' to ino %lu (nlink %d) in dir ino %lu",
		dentry->d_name.len, dentry->d_name.name, inode->i_ino,
		inode->i_nlink, dir->i_ino);
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	ubifs_assert(mutex_is_locked(&dir->i_mutex));
	ubifs_assert(mutex_is_locked(&inode->i_mutex));
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	/*
	 * Return -ENOENT if we've raced with unlink and i_nlink is 0.  Doing
	 * otherwise has the potential to corrupt the orphan inode list.
	 *
	 * Indeed, consider a scenario when 'vfs_link(dirA/fileA)' and
	 * 'vfs_unlink(dirA/fileA, dirB/fileB)' race. 'vfs_link()' does not
	 * lock 'dirA->i_mutex', so this is possible. Both of the functions
	 * lock 'fileA->i_mutex' though. Suppose 'vfs_unlink()' wins, and takes
	 * 'fileA->i_mutex' mutex first. Suppose 'fileA->i_nlink' is 1. In this
	 * case 'ubifs_unlink()' will drop the last reference, and put 'inodeA'
	 * to the list of orphans. After this, 'vfs_link()' will link
	 * 'dirB/fileB' to 'inodeA'. This is a problem because, for example,
	 * the subsequent 'vfs_unlink(dirB/fileB)' will add the same inode
	 * to the list of orphans.
	 */
	 if (inode->i_nlink == 0)
		 return -ENOENT;

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	err = dbg_check_synced_i_size(inode);
	if (err)
		return err;

	err = ubifs_budget_space(c, &req);
	if (err)
		return err;

	lock_2_inodes(dir, inode);
	inc_nlink(inode);
	atomic_inc(&inode->i_count);
	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 = dentry->d_inode;
	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 };

	/*
	 * 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 '%.*s' from ino %lu (nlink %d) in dir ino %lu",
		dentry->d_name.len, dentry->d_name.name, inode->i_ino,
		inode->i_nlink, dir->i_ino);
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	ubifs_assert(mutex_is_locked(&dir->i_mutex));
	ubifs_assert(mutex_is_locked(&inode->i_mutex));
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	err = dbg_check_synced_i_size(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->nospace = c->nospace_rp = 0;
		smp_wmb();
	}
	return 0;

out_cancel:
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	inc_nlink(inode);
	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 = dentry->d_inode;
	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 '%.*s', ino %lu in dir ino %lu", dentry->d_name.len,
		dentry->d_name.name, inode->i_ino, dir->i_ino);
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Artem Bityutskiy 已提交
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	ubifs_assert(mutex_is_locked(&dir->i_mutex));
	ubifs_assert(mutex_is_locked(&inode->i_mutex));
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
	err = check_dir_empty(c, dentry->d_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);
	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->nospace = c->nospace_rp = 0;
		smp_wmb();
	}
	return 0;

out_cancel:
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	inc_nlink(dir);
	inc_nlink(inode);
	inc_nlink(inode);
	unlock_2_inodes(dir, inode);
	if (budgeted)
		ubifs_release_budget(c, &req);
	return err;
}

static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, int 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);
744
	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804

	/*
	 * Budget request settings: new inode, new direntry and changing parent
	 * directory inode.
	 */

	dbg_gen("dent '%.*s', mode %#x in dir ino %lu",
		dentry->d_name.len, dentry->d_name.name, 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;
	}

	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("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);
	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,
		       int 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,
805 806
					.new_ino_d = ALIGN(devlen, 8),
					.dirtied_ino = 1 };
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879

	/*
	 * Budget request settings: new inode, new direntry and changing parent
	 * directory inode.
	 */

	dbg_gen("dent '%.*s' in dir ino %lu",
		dentry->d_name.len, dentry->d_name.name, dir->i_ino);

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

	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;

	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);
	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,
880 881
					.new_ino_d = ALIGN(len, 8),
					.dirtied_ino = 1 };
882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947

	/*
	 * Budget request settings: new inode, new direntry and changing parent
	 * directory inode.
	 */

	dbg_gen("dent '%.*s', target '%s' in dir ino %lu", dentry->d_name.len,
		dentry->d_name.name, 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';
	/*
	 * 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;

	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;
}

/**
A
Artem Bityutskiy 已提交
948
 * lock_3_inodes - a wrapper for locking three UBIFS inodes.
949 950 951 952
 * @inode1: first inode
 * @inode2: second inode
 * @inode3: third inode
 *
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Artem Bityutskiy 已提交
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 * 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.
959 960 961 962
 */
static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
			  struct inode *inode3)
{
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Artem Bityutskiy 已提交
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	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);
968 969 970
}

/**
A
Artem Bityutskiy 已提交
971
 * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
972 973 974 975 976 977 978 979 980
 * @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);
A
Artem Bityutskiy 已提交
981 982 983
	if (inode1 != inode2)
		mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
	mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
}

static int ubifs_rename(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 inode *old_inode = old_dentry->d_inode;
	struct inode *new_inode = new_dentry->d_inode;
	struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
	int err, release, sync = 0, move = (new_dir != old_dir);
	int is_dir = S_ISDIR(old_inode->i_mode);
	int unlink = !!new_inode;
	int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len);
	int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len);
	struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
					.dirtied_ino = 3 };
	struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
1001
			.dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
	struct timespec time;

	/*
	 * Budget request settings: deletion direntry, new direntry, removing
	 * the old inode, and changing old and new parent directory inodes.
	 *
	 * However, this operation also marks the target inode as dirty and
	 * does not write it, so we allocate budget for the target inode
	 * separately.
	 */

	dbg_gen("dent '%.*s' ino %lu in dir ino %lu to dent '%.*s' in "
		"dir ino %lu", old_dentry->d_name.len, old_dentry->d_name.name,
		old_inode->i_ino, old_dir->i_ino, new_dentry->d_name.len,
		new_dentry->d_name.name, new_dir->i_ino);
A
Artem Bityutskiy 已提交
1017 1018 1019 1020 1021
	ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
	ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
	if (unlink)
		ubifs_assert(mutex_is_locked(&new_inode->i_mutex));

1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122

	if (unlink && is_dir) {
		err = check_dir_empty(c, new_inode);
		if (err)
			return err;
	}

	err = ubifs_budget_space(c, &req);
	if (err)
		return err;
	err = ubifs_budget_space(c, &ino_req);
	if (err) {
		ubifs_release_budget(c, &req);
		return err;
	}

	lock_3_inodes(old_dir, new_dir, new_inode);

	/*
	 * Like most other Unix systems, set the @i_ctime for inodes on a
	 * rename.
	 */
	time = ubifs_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, decrement its @i_nlink twice because an empty
		 * directory has @i_nlink 2.
		 */
		if (is_dir)
			drop_nlink(new_inode);
		new_inode->i_ctime = time;
		drop_nlink(new_inode);
	} 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;
	}
	err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry,
			       sync);
	if (err)
		goto out_cancel;

	unlock_3_inodes(old_dir, new_dir, new_inode);
	ubifs_release_budget(c, &req);

	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))
1123
		err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
	return err;

out_cancel:
	if (unlink) {
		if (is_dir)
			inc_nlink(new_inode);
		inc_nlink(new_inode);
	} 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_3_inodes(old_dir, new_dir, new_inode);
	ubifs_release_budget(c, &ino_req);
	ubifs_release_budget(c, &req);
	return err;
}

int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
		  struct kstat *stat)
{
	loff_t size;
	struct inode *inode = dentry->d_inode;
	struct ubifs_inode *ui = ubifs_inode(inode);

	mutex_lock(&ui->ui_mutex);
	stat->dev = inode->i_sb->s_dev;
	stat->ino = inode->i_ino;
	stat->mode = inode->i_mode;
	stat->nlink = inode->i_nlink;
	stat->uid = inode->i_uid;
	stat->gid = inode->i_gid;
	stat->rdev = inode->i_rdev;
	stat->atime = inode->i_atime;
	stat->mtime = inode->i_mtime;
	stat->ctime = inode->i_ctime;
	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;
}

A
Artem Bityutskiy 已提交
1201
const struct inode_operations ubifs_dir_inode_operations = {
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	.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,
#ifdef CONFIG_UBIFS_FS_XATTR
	.setxattr    = ubifs_setxattr,
	.getxattr    = ubifs_getxattr,
	.listxattr   = ubifs_listxattr,
	.removexattr = ubifs_removexattr,
#endif
};

A
Artem Bityutskiy 已提交
1221
const struct file_operations ubifs_dir_operations = {
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	.llseek         = ubifs_dir_llseek,
	.release        = ubifs_dir_release,
	.read           = generic_read_dir,
	.readdir        = ubifs_readdir,
	.fsync          = ubifs_fsync,
	.unlocked_ioctl = ubifs_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ubifs_compat_ioctl,
#endif
};