jfs_inode.c

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/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
#include "jfs_filsys.h"
#include "jfs_imap.h"
#include "jfs_dinode.h"
#include "jfs_debug.h"


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;
}

void jfs_get_inode_flags(struct jfs_inode_info *jfs_ip)
{
    unsigned int flags = jfs_ip->vfs_inode.i_flags;

    jfs_ip->mode2 &= ~(JFS_IMMUTABLE_FL | JFS_APPEND_FL | JFS_NOATIME_FL |
               JFS_DIRSYNC_FL | JFS_SYNC_FL);
    if (flags & S_IMMUTABLE)
        jfs_ip->mode2 |= JFS_IMMUTABLE_FL;
    if (flags & S_APPEND)
        jfs_ip->mode2 |= JFS_APPEND_FL;
    if (flags & S_NOATIME)
        jfs_ip->mode2 |= JFS_NOATIME_FL;
    if (flags & S_DIRSYNC)
        jfs_ip->mode2 |= JFS_DIRSYNC_FL;
    if (flags & S_SYNC)
        jfs_ip->mode2 |= JFS_SYNC_FL;
}

/*
 * 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:
    clear_nlink(inode);
    unlock_new_inode(inode);
fail_put:
    iput(inode);
fail:
    return ERR_PTR(rc);
}