C++ JFS_IP函数代码示例

void jfs_set_inode_flags(struct inode *inode)
{
	unsigned int flags = JFS_IP(inode)->mode2;

	inode->i_flags &= ~(S_IMMUTABLE | S_APPEND |
		S_NOATIME | S_DIRSYNC | S_SYNC);

	if (flags & JFS_IMMUTABLE_FL)
		inode->i_flags |= S_IMMUTABLE;
	if (flags & JFS_APPEND_FL)
		inode->i_flags |= S_APPEND;
	if (flags & JFS_NOATIME_FL)
		inode->i_flags |= S_NOATIME;
	if (flags & JFS_DIRSYNC_FL)
		inode->i_flags |= S_DIRSYNC;
	if (flags & JFS_SYNC_FL)
		inode->i_flags |= S_SYNC;
}

struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
{
	struct inode *inode;
	int ret;

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	ret = diRead(inode);
	if (ret < 0) {
		iget_failed(inode);
		return ERR_PTR(ret);
	}

	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &jfs_file_inode_operations;
		inode->i_fop = &jfs_file_operations;
		inode->i_mapping->a_ops = &jfs_aops;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &jfs_dir_inode_operations;
		inode->i_fop = &jfs_dir_operations;
	} else if (S_ISLNK(inode->i_mode)) {
		if (inode->i_size >= IDATASIZE) {
			inode->i_op = &page_symlink_inode_operations;
			inode->i_mapping->a_ops = &jfs_aops;
		} else {
			inode->i_op = &jfs_fast_symlink_inode_operations;
			/*
			 * The inline data should be null-terminated, but
			 * don't let on-disk corruption crash the kernel
			 */
			JFS_IP(inode)->i_inline[inode->i_size] = '\0';
		}
	} else {
		inode->i_op = &jfs_file_inode_operations;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
	}
	unlock_new_inode(inode);
	return inode;
}

void jfs_delete_inode(struct inode *inode)
{
	jfs_info("In jfs_delete_inode, inode = 0x%p", inode);

	if (!is_bad_inode(inode) &&
	    (JFS_IP(inode)->fileset == FILESYSTEM_I)) {
		truncate_inode_pages(&inode->i_data, 0);

		if (test_cflag(COMMIT_Freewmap, inode))
			jfs_free_zero_link(inode);

		diFree(inode);

		/*
		 * Free the inode from the quota allocation.
		 */
		DQUOT_INIT(inode);
		DQUOT_FREE_INODE(inode);
		DQUOT_DROP(inode);
	}

	clear_inode(inode);
}

/*
 *	jfs_permission()
 *
 * modified vfs_permission to check posix acl
 */
int jfs_permission(struct inode * inode, int mask, struct nameidata *nd)
{
    umode_t mode = inode->i_mode;
    struct jfs_inode_info *ji = JFS_IP(inode);

    if (mask & MAY_WRITE) {
        /*
         * Nobody gets write access to a read-only fs.
         */
        if (IS_RDONLY(inode) &&
                (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
            return -EROFS;

        /*
         * Nobody gets write access to an immutable file.
         */
        if (IS_IMMUTABLE(inode))
            return -EACCES;
    }

    if (current->fsuid == inode->i_uid) {
        mode >>= 6;
        goto check_mode;
    }

/*
 * NAME:	jfs_rename
 *
 * FUNCTION:	rename a file or directory
 */
static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                      struct inode *new_dir, struct dentry *new_dentry)
{
    struct btstack btstack;
    ino_t ino;
    struct component_name new_dname;
    struct inode *new_ip;
    struct component_name old_dname;
    struct inode *old_ip;
    int rc;
    tid_t tid;
    struct tlock *tlck;
    struct dt_lock *dtlck;
    struct lv *lv;
    int ipcount;
    struct inode *iplist[4];
    struct tblock *tblk;
    s64 new_size = 0;
    int commit_flag;


    jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
             new_dentry->d_name.name);

    dquot_initialize(old_dir);
    dquot_initialize(new_dir);

    old_ip = old_dentry->d_inode;
    new_ip = new_dentry->d_inode;

    if ((rc = get_UCSname(&old_dname, old_dentry)))
        goto out1;

    if ((rc = get_UCSname(&new_dname, new_dentry)))
        goto out2;

    /*
     * Make sure source inode number is what we think it is
     */
    rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
    if (rc || (ino != old_ip->i_ino)) {
        rc = -ENOENT;
        goto out3;
    }

    /*
     * Make sure dest inode number (if any) is what we think it is
     */
    rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
    if (!rc) {
        if ((!new_ip) || (ino != new_ip->i_ino)) {
            rc = -ESTALE;
            goto out3;
        }
    } else if (rc != -ENOENT)
        goto out3;
    else if (new_ip) {
        /* no entry exists, but one was expected */
        rc = -ESTALE;
        goto out3;
    }

    if (S_ISDIR(old_ip->i_mode)) {
        if (new_ip) {
            if (!dtEmpty(new_ip)) {
                rc = -ENOTEMPTY;
                goto out3;
            }
        } else if ((new_dir != old_dir) &&
                   (new_dir->i_nlink == JFS_LINK_MAX)) {
            rc = -EMLINK;
            goto out3;
        }
    } else if (new_ip) {
        IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
        /* Init inode for quota operations. */
        dquot_initialize(new_ip);
    }

    /*
     * The real work starts here
     */
    tid = txBegin(new_dir->i_sb, 0);

    /*
     * How do we know the locking is safe from deadlocks?
     * The vfs does the hard part for us.  Any time we are taking nested
     * commit_mutexes, the vfs already has i_mutex held on the parent.
     * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
     */
    mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
    mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
    if (old_dir != new_dir)
        mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
                          COMMIT_MUTEX_SECOND_PARENT);
//.........这里部分代码省略.........

/*
 * NAME:	jfs_mknod
 *
 * FUNCTION:	Create a special file (device)
 */
static int jfs_mknod(struct inode *dir, struct dentry *dentry,
                     int mode, dev_t rdev)
{
    struct jfs_inode_info *jfs_ip;
    struct btstack btstack;
    struct component_name dname;
    ino_t ino;
    struct inode *ip;
    struct inode *iplist[2];
    int rc;
    tid_t tid;
    struct tblock *tblk;

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

    jfs_info("jfs_mknod: %s", dentry->d_name.name);

    dquot_initialize(dir);

    if ((rc = get_UCSname(&dname, dentry)))
        goto out;

    ip = ialloc(dir, mode);
    if (IS_ERR(ip)) {
        rc = PTR_ERR(ip);
        goto out1;
    }
    jfs_ip = JFS_IP(ip);

    tid = txBegin(dir->i_sb, 0);

    mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);

    rc = jfs_init_acl(tid, ip, dir);
    if (rc)
        goto out3;

    rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
    if (rc) {
        txAbort(tid, 0);
        goto out3;
    }

    if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
        txAbort(tid, 0);
        goto out3;
    }

    tblk = tid_to_tblock(tid);
    tblk->xflag |= COMMIT_CREATE;
    tblk->ino = ip->i_ino;
    tblk->u.ixpxd = JFS_IP(ip)->ixpxd;

    ino = ip->i_ino;
    if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
        txAbort(tid, 0);
        goto out3;
    }

    ip->i_op = &jfs_file_inode_operations;
    jfs_ip->dev = new_encode_dev(rdev);
    init_special_inode(ip, ip->i_mode, rdev);

    mark_inode_dirty(ip);

    dir->i_ctime = dir->i_mtime = CURRENT_TIME;

    mark_inode_dirty(dir);

    iplist[0] = dir;
    iplist[1] = ip;
    rc = txCommit(tid, 2, iplist, 0);

out3:
    txEnd(tid);
    mutex_unlock(&JFS_IP(ip)->commit_mutex);
    mutex_unlock(&JFS_IP(dir)->commit_mutex);
    if (rc) {
        free_ea_wmap(ip);
        ip->i_nlink = 0;
        unlock_new_inode(ip);
        iput(ip);
    } else {
        d_instantiate(dentry, ip);
        unlock_new_inode(ip);
    }

out1:
    free_UCSname(&dname);

out:
    jfs_info("jfs_mknod: returning %d", rc);
    return rc;
//.........这里部分代码省略.........

static void *jfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	char *s = JFS_IP(dentry->d_inode)->i_inline;
	nd_set_link(nd, s);
	return NULL;
}

/*
 * NAME:	jfs_link(vp, dvp, name, crp)
 *
 * FUNCTION:	create a link to <vp> by the name = <name>
 *		in the parent directory <dvp>
 *
 * PARAMETER:	vp 	- target object
 *		dvp	- parent directory of new link
 *		name	- name of new link to target object
 *		crp	- credential
 *
 * RETURN:	Errors from subroutines
 *
 * note:
 * JFS does NOT support link() on directories (to prevent circular
 * path in the directory hierarchy);
 * EPERM: the target object is a directory, and either the caller
 * does not have appropriate privileges or the implementation prohibits
 * using link() on directories [XPG4.2].
 *
 * JFS does NOT support links between file systems:
 * EXDEV: target object and new link are on different file systems and
 * implementation does not support links between file systems [XPG4.2].
 */
int jfs_link(struct dentry *old_dentry,
	     struct inode *dir, struct dentry *dentry)
{
	int rc;
	tid_t tid;
	struct inode *ip = old_dentry->d_inode;
	ino_t ino;
	struct component_name dname;
	struct btstack btstack;
	struct inode *iplist[2];

	jFYI(1,
	     ("jfs_link: %s %s\n", old_dentry->d_name.name,
	      dentry->d_name.name));

	/* JFS does NOT support link() on directories */
	if (S_ISDIR(ip->i_mode))
		return -EPERM;

	tid = txBegin(ip->i_sb, 0);

	down(&JFS_IP(dir)->commit_sem);
	down(&JFS_IP(ip)->commit_sem);

	if (ip->i_nlink == JFS_LINK_MAX) {
		rc = EMLINK;
		goto out;
	}

	/*
	 * scan parent directory for entry/freespace
	 */
	if ((rc = get_UCSname(&dname, dentry, JFS_SBI(ip->i_sb)->nls_tab)))
		goto out;

	if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
		goto out;

	/*
	 * create entry for new link in parent directory
	 */
	ino = ip->i_ino;
	if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
		goto out;

	/* update object inode */
	ip->i_nlink++;		/* for new link */
	ip->i_ctime = CURRENT_TIME;
	mark_inode_dirty(dir);
	atomic_inc(&ip->i_count);
	d_instantiate(dentry, ip);

	iplist[0] = ip;
	iplist[1] = dir;
	rc = txCommit(tid, 2, &iplist[0], 0);

      out:
	txEnd(tid);

	up(&JFS_IP(dir)->commit_sem);
	up(&JFS_IP(ip)->commit_sem);

	jFYI(1, ("jfs_link: rc:%d\n", rc));
	return -rc;
}

/*
 * NAME:	jfs_link(vp, dvp, name, crp)
 *
 * FUNCTION:	create a link to <vp> by the name = <name>
 *		in the parent directory <dvp>
 *
 * PARAMETER:	vp	- target object
 *		dvp	- parent directory of new link
 *		name	- name of new link to target object
 *		crp	- credential
 *
 * RETURN:	Errors from subroutines
 *
 * note:
 * JFS does NOT support link() on directories (to prevent circular
 * path in the directory hierarchy);
 * EPERM: the target object is a directory, and either the caller
 * does not have appropriate privileges or the implementation prohibits
 * using link() on directories [XPG4.2].
 *
 * JFS does NOT support links between file systems:
 * EXDEV: target object and new link are on different file systems and
 * implementation does not support links between file systems [XPG4.2].
 */
static int jfs_link(struct dentry *old_dentry,
                    struct inode *dir, struct dentry *dentry)
{
    int rc;
    tid_t tid;
    struct inode *ip = old_dentry->d_inode;
    ino_t ino;
    struct component_name dname;
    struct btstack btstack;
    struct inode *iplist[2];

    jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
             dentry->d_name.name);

    if (ip->i_nlink == JFS_LINK_MAX)
        return -EMLINK;

    dquot_initialize(dir);

    tid = txBegin(ip->i_sb, 0);

    mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);

    /*
     * scan parent directory for entry/freespace
     */
    if ((rc = get_UCSname(&dname, dentry)))
        goto out;

    if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
        goto free_dname;

    /*
     * create entry for new link in parent directory
     */
    ino = ip->i_ino;
    if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
        goto free_dname;

    /* update object inode */
    inc_nlink(ip);		/* for new link */
    ip->i_ctime = CURRENT_TIME;
    dir->i_ctime = dir->i_mtime = CURRENT_TIME;
    mark_inode_dirty(dir);
    ihold(ip);

    iplist[0] = ip;
    iplist[1] = dir;
    rc = txCommit(tid, 2, &iplist[0], 0);

    if (rc) {
        ip->i_nlink--; /* never instantiated */
        iput(ip);
    } else
        d_instantiate(dentry, ip);

free_dname:
    free_UCSname(&dname);

out:
    txEnd(tid);

    mutex_unlock(&JFS_IP(ip)->commit_mutex);
    mutex_unlock(&JFS_IP(dir)->commit_mutex);

    jfs_info("jfs_link: rc:%d", rc);
    return rc;
}

long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
    struct inode *inode = filp->f_dentry->d_inode;
    struct jfs_inode_info *jfs_inode = JFS_IP(inode);
    unsigned int flags;

    switch (cmd) {
    case JFS_IOC_GETFLAGS:
        jfs_get_inode_flags(jfs_inode);
        flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
        flags = jfs_map_ext2(flags, 0);
        return put_user(flags, (int __user *) arg);
    case JFS_IOC_SETFLAGS: {
        unsigned int oldflags;
        int err;

        err = mnt_want_write_file(filp);
        if (err)
            return err;

        if (!inode_owner_or_capable(inode)) {
            err = -EACCES;
            goto setflags_out;
        }
        if (get_user(flags, (int __user *) arg)) {
            err = -EFAULT;
            goto setflags_out;
        }

        flags = jfs_map_ext2(flags, 1);
        if (!S_ISDIR(inode->i_mode))
            flags &= ~JFS_DIRSYNC_FL;


        if (IS_NOQUOTA(inode)) {
            err = -EPERM;
            goto setflags_out;
        }


        mutex_lock(&inode->i_mutex);

        jfs_get_inode_flags(jfs_inode);
        oldflags = jfs_inode->mode2;

        if ((oldflags & JFS_IMMUTABLE_FL) ||
                ((flags ^ oldflags) &
                 (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
            if (!capable(CAP_LINUX_IMMUTABLE)) {
                mutex_unlock(&inode->i_mutex);
                err = -EPERM;
                goto setflags_out;
            }
        }

        flags = flags & JFS_FL_USER_MODIFIABLE;
        flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
        jfs_inode->mode2 = flags;

        jfs_set_inode_flags(inode);
        mutex_unlock(&inode->i_mutex);
        inode->i_ctime = CURRENT_TIME_SEC;
        mark_inode_dirty(inode);
setflags_out:
        mnt_drop_write_file(filp);
        return err;
    }
    default:
        return -ENOTTY;
    }
}

/*
 * NAME:	ialloc()
 *
 * FUNCTION:	Allocate a new inode
 *
 */
struct inode *ialloc(struct inode *parent, umode_t mode)
{
	struct super_block *sb = parent->i_sb;
	struct inode *inode;
	struct jfs_inode_info *jfs_inode;
	int rc;

	inode = new_inode(sb);
	if (!inode) {
		jfs_warn("ialloc: new_inode returned NULL!");
		rc = -ENOMEM;
		goto fail;
	}

	jfs_inode = JFS_IP(inode);

	rc = diAlloc(parent, S_ISDIR(mode), inode);
	if (rc) {
		jfs_warn("ialloc: diAlloc returned %d!", rc);
		if (rc == -EIO)
			make_bad_inode(inode);
		goto fail_put;
	}

	if (insert_inode_locked(inode) < 0) {
		rc = -EINVAL;
		goto fail_unlock;
	}

	inode_init_owner(inode, parent, mode);
	/*
	 * New inodes need to save sane values on disk when
	 * uid & gid mount options are used
	 */
	jfs_inode->saved_uid = inode->i_uid;
	jfs_inode->saved_gid = inode->i_gid;

	/*
	 * Allocate inode to quota.
	 */
	dquot_initialize(inode);
	rc = dquot_alloc_inode(inode);
	if (rc)
		goto fail_drop;

	/* inherit flags from parent */
	jfs_inode->mode2 = JFS_IP(parent)->mode2 & JFS_FL_INHERIT;

	if (S_ISDIR(mode)) {
		jfs_inode->mode2 |= IDIRECTORY;
		jfs_inode->mode2 &= ~JFS_DIRSYNC_FL;
	}
	else {
		jfs_inode->mode2 |= INLINEEA | ISPARSE;
		if (S_ISLNK(mode))
			jfs_inode->mode2 &= ~(JFS_IMMUTABLE_FL|JFS_APPEND_FL);
	}
	jfs_inode->mode2 |= inode->i_mode;

	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	jfs_inode->otime = inode->i_ctime.tv_sec;
	inode->i_generation = JFS_SBI(sb)->gengen++;

	jfs_inode->cflag = 0;

	/* Zero remaining fields */
	memset(&jfs_inode->acl, 0, sizeof(dxd_t));
	memset(&jfs_inode->ea, 0, sizeof(dxd_t));
	jfs_inode->next_index = 0;
	jfs_inode->acltype = 0;
	jfs_inode->btorder = 0;
	jfs_inode->btindex = 0;
	jfs_inode->bxflag = 0;
	jfs_inode->blid = 0;
	jfs_inode->atlhead = 0;
	jfs_inode->atltail = 0;
	jfs_inode->xtlid = 0;
	jfs_set_inode_flags(inode);

	jfs_info("ialloc returns inode = 0x%p\n", inode);

	return inode;

fail_drop:
	dquot_drop(inode);
	inode->i_flags |= S_NOQUOTA;
fail_unlock:
	inode->i_nlink = 0;
	unlock_new_inode(inode);
fail_put:
	iput(inode);
fail:
	return ERR_PTR(rc);
//.........这里部分代码省略.........

/*
 * NAME:	jfs_free_zero_link()
 *
 * FUNCTION:	for non-directory, called by iClose(),
 *		free resources of a file from cache and WORKING map
 *		for a file previously committed with zero link count
 *		while associated with a pager object,
 *
 * PARAMETER:	ip	- pointer to inode of file.
 */
void jfs_free_zero_link(struct inode *ip)
{
    int type;

    jfs_info("jfs_free_zero_link: ip = 0x%p", ip);

    /* return if not reg or symbolic link or if size is
     * already ok.
     */
    type = ip->i_mode & S_IFMT;

    switch (type) {
    case S_IFREG:
        break;
    case S_IFLNK:
        /* if its contained in inode nothing to do */
        if (ip->i_size < IDATASIZE)
            return;
        break;
    default:
        return;
    }

    /*
     * free EA
     */
    if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
        s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
        int xlen = lengthDXD(&JFS_IP(ip)->ea);
        struct maplock maplock;	/* maplock for COMMIT_WMAP */
        struct pxd_lock *pxdlock;	/* maplock for COMMIT_WMAP */

        /* free EA pages from cache */
        invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);

        /* free EA extent from working block map */
        maplock.index = 1;
        pxdlock = (struct pxd_lock *) & maplock;
        pxdlock->flag = mlckFREEPXD;
        PXDaddress(&pxdlock->pxd, xaddr);
        PXDlength(&pxdlock->pxd, xlen);
        txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
    }

    /*
     * free ACL
     */
    if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
        s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
        int xlen = lengthDXD(&JFS_IP(ip)->acl);
        struct maplock maplock;	/* maplock for COMMIT_WMAP */
        struct pxd_lock *pxdlock;	/* maplock for COMMIT_WMAP */

        invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);

        /* free ACL extent from working block map */
        maplock.index = 1;
        pxdlock = (struct pxd_lock *) & maplock;
        pxdlock->flag = mlckFREEPXD;
        PXDaddress(&pxdlock->pxd, xaddr);
        PXDlength(&pxdlock->pxd, xlen);
        txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
    }

    /*
     * free xtree/data (truncate to zero length):
     * free xtree/data pages from cache, and
     * free xtree/data blocks from working block map;
     */
    if (ip->i_size)
        xtTruncate(0, ip, 0, COMMIT_WMAP);
}

/*
 * NAME:	ialloc()
 *
 * FUNCTION:	Allocate a new inode
 *
 */
struct inode *ialloc(struct inode *parent, umode_t mode)
{
	struct super_block *sb = parent->i_sb;
	struct inode *inode;
	struct jfs_inode_info *jfs_inode;
	int rc;

	inode = new_inode(sb);
	if (!inode) {
		jERROR(1, ("ialloc: new_inode returned NULL!\n"));
		return inode;
	}

	rc = alloc_jfs_inode(inode);
	if (rc) {
		make_bad_inode(inode);
		iput(inode);
		return NULL;
	}
	jfs_inode = JFS_IP(inode);

	rc = diAlloc(parent, S_ISDIR(mode), inode);
	if (rc) {
		jERROR(1, ("ialloc: diAlloc returned %d!\n", rc));
		free_jfs_inode(inode);
		make_bad_inode(inode);
		iput(inode);
		return NULL;
	}

	inode->i_uid = current->fsuid;
	if (parent->i_mode & S_ISGID) {
		inode->i_gid = parent->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else
		inode->i_gid = current->fsgid;

	inode->i_mode = mode;
	if (S_ISDIR(mode))
		jfs_inode->mode2 = IDIRECTORY | mode;
	else
		jfs_inode->mode2 = INLINEEA | ISPARSE | mode;
	inode->i_blksize = sb->s_blocksize;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	jfs_inode->otime = inode->i_ctime;
	inode->i_generation = JFS_SBI(sb)->gengen++;

	jfs_inode->cflag = 0;
	set_cflag(COMMIT_New, inode);

	/* Zero remaining fields */
	memset(&jfs_inode->acl, 0, sizeof(dxd_t));
	memset(&jfs_inode->ea, 0, sizeof(dxd_t));
	jfs_inode->next_index = 0;
	jfs_inode->acltype = 0;
	jfs_inode->btorder = 0;
	jfs_inode->btindex = 0;
	jfs_inode->bxflag = 0;
	jfs_inode->blid = 0;
	jfs_inode->atlhead = 0;
	jfs_inode->atltail = 0;
	jfs_inode->xtlid = 0;

	jFYI(1, ("ialloc returns inode = 0x%p\n", inode));

	return inode;
}

/*
 * NAME:	jfs_rmdir(dip, dentry)
 *
 * FUNCTION:	remove a link to child directory
 *
 * PARAMETER:	dip 	- parent inode
 *		dentry	- child directory dentry
 *
 * RETURN:	EINVAL	- if name is . or ..
 *		EINVAL  - if . or .. exist but are invalid.
 *		errors from subroutines
 *
 * note:
 * if other threads have the directory open when the last link 
 * is removed, the "." and ".." entries, if present, are removed before 
 * rmdir() returns and no new entries may be created in the directory, 
 * but the directory is not removed until the last reference to 
 * the directory is released (cf.unlink() of regular file).
 */
int jfs_rmdir(struct inode *dip, struct dentry *dentry)
{
	int rc;
	tid_t tid;		/* transaction id */
	struct inode *ip = dentry->d_inode;
	ino_t ino;
	struct component_name dname;
	struct inode *iplist[2];
	struct tblock *tblk;

	jFYI(1, ("jfs_rmdir: dip:0x%p name:%s\n", dip, dentry->d_name.name));

	/* directory must be empty to be removed */
	if (!dtEmpty(ip)) {
		rc = ENOTEMPTY;
		goto out;
	}

	if ((rc = get_UCSname(&dname, dentry, JFS_SBI(dip->i_sb)->nls_tab))) {
		goto out;
	}

	tid = txBegin(dip->i_sb, 0);

	down(&JFS_IP(dip)->commit_sem);
	down(&JFS_IP(ip)->commit_sem);

	iplist[0] = dip;
	iplist[1] = ip;

	tblk = tid_to_tblock(tid);
	tblk->xflag |= COMMIT_DELETE;
	tblk->ip = ip;

	/*
	 * delete the entry of target directory from parent directory
	 */
	ino = ip->i_ino;
	if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
		jERROR(1, ("jfs_rmdir: dtDelete returned %d\n", rc));
		if (rc == EIO)
			txAbort(tid, 1);
		txEnd(tid);
		up(&JFS_IP(dip)->commit_sem);
		up(&JFS_IP(ip)->commit_sem);

		goto out2;
	}

	/* update parent directory's link count corresponding
	 * to ".." entry of the target directory deleted
	 */
	dip->i_nlink--;
	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
	mark_inode_dirty(dip);

	/*
	 * OS/2 could have created EA and/or ACL
	 */
	/* free EA from both persistent and working map */
	if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
		/* free EA pages */
		txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
	}
	JFS_IP(ip)->ea.flag = 0;

	/* free ACL from both persistent and working map */
	if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
		/* free ACL pages */
		txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
	}
	JFS_IP(ip)->acl.flag = 0;

	/* mark the target directory as deleted */
	ip->i_nlink = 0;
	mark_inode_dirty(ip);

	rc = txCommit(tid, 2, &iplist[0], 0);

	txEnd(tid);

//.........这里部分代码省略.........

/*
 * NAME:	jfs_mkdir(dip, dentry, mode)
 *
 * FUNCTION:	create a child directory in the parent directory <dip>
 *		with name = <from dentry> and mode = <mode>
 *
 * PARAMETER:	dip 	- parent directory vnode
 *		dentry	- dentry of child directory
 *		mode	- create mode (rwxrwxrwx).
 *
 * RETURN:	Errors from subroutines
 *
 * note:
 * EACCESS: user needs search+write permission on the parent directory
 */
static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
{
	int rc = 0;
	tid_t tid;		/* transaction id */
	struct inode *ip = NULL;	/* child directory inode */
	ino_t ino;
	struct component_name dname;	/* child directory name */
	struct btstack btstack;
	struct inode *iplist[2];
	struct tblock *tblk;

	jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);

	/* link count overflow on parent directory ? */
	if (dip->i_nlink == JFS_LINK_MAX) {
		rc = -EMLINK;
		goto out1;
	}

	/*
	 * search parent directory for entry/freespace
	 * (dtSearch() returns parent directory page pinned)
	 */
	if ((rc = get_UCSname(&dname, dentry)))
		goto out1;

	/*
	 * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
	 * block there while holding dtree page, so we allocate the inode &
	 * begin the transaction before we search the directory.
	 */
	ip = ialloc(dip, S_IFDIR | mode);
	if (ip == NULL) {
		rc = -ENOSPC;
		goto out2;
	}

	tid = txBegin(dip->i_sb, 0);

	mutex_lock(&JFS_IP(dip)->commit_mutex);
	mutex_lock(&JFS_IP(ip)->commit_mutex);

	rc = jfs_init_acl(tid, ip, dip);
	if (rc)
		goto out3;

	rc = jfs_init_security(tid, ip, dip);
	if (rc) {
		txAbort(tid, 0);
		goto out3;
	}

	if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
		jfs_err("jfs_mkdir: dtSearch returned %d", rc);
		txAbort(tid, 0);
		goto out3;
	}

	tblk = tid_to_tblock(tid);
	tblk->xflag |= COMMIT_CREATE;
	tblk->ino = ip->i_ino;
	tblk->u.ixpxd = JFS_IP(ip)->ixpxd;

	iplist[0] = dip;
	iplist[1] = ip;

	/*
	 * initialize the child directory in-line in inode
	 */
	dtInitRoot(tid, ip, dip->i_ino);

	/*
	 * create entry in parent directory for child directory
	 * (dtInsert() releases parent directory page)
	 */
	ino = ip->i_ino;
	if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
		if (rc == -EIO) {
			jfs_err("jfs_mkdir: dtInsert returned -EIO");
			txAbort(tid, 1);	/* Marks Filesystem dirty */
		} else
			txAbort(tid, 0);	/* Filesystem full */
		goto out3;
	}

//.........这里部分代码省略.........