root/fs/udf/ialloc.c

DEFINITIONS

1. udf_free_inode
2. udf_new_inode

/*
 * ialloc.c
 *
 * PURPOSE
 *      Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
 *
 * COPYRIGHT
 *      This file is distributed under the terms of the GNU General Public
 *      License (GPL). Copies of the GPL can be obtained from:
 *              ftp://prep.ai.mit.edu/pub/gnu/GPL
 *      Each contributing author retains all rights to their own work.
 *
 *  (C) 1998-2001 Ben Fennema
 *
 * HISTORY
 *
 *  02/24/99 blf  Created.
 *
 */

#include "udfdecl.h"
#include <linux/fs.h>
#include <linux/quotaops.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include "udf_i.h"
#include "udf_sb.h"

void udf_free_inode(struct inode *inode)
{
        struct super_block *sb = inode->i_sb;
        struct udf_sb_info *sbi = UDF_SB(sb);

        /*
         * Note: we must free any quota before locking the superblock,
         * as writing the quota to disk may need the lock as well.
         */
        DQUOT_FREE_INODE(inode);
        DQUOT_DROP(inode);

        clear_inode(inode);

        mutex_lock(&sbi->s_alloc_mutex);
        if (sbi->s_lvid_bh) {
                struct logicalVolIntegrityDescImpUse *lvidiu =
                                                        udf_sb_lvidiu(sbi);
                if (S_ISDIR(inode->i_mode))
                        le32_add_cpu(&lvidiu->numDirs, -1);
                else
                        le32_add_cpu(&lvidiu->numFiles, -1);

                mark_buffer_dirty(sbi->s_lvid_bh);
        }
        mutex_unlock(&sbi->s_alloc_mutex);

        udf_free_blocks(sb, NULL, UDF_I(inode)->i_location, 0, 1);
}

struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
{
        struct super_block *sb = dir->i_sb;
        struct udf_sb_info *sbi = UDF_SB(sb);
        struct inode *inode;
        int block;
        uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
        struct udf_inode_info *iinfo;
        struct udf_inode_info *dinfo = UDF_I(dir);

        inode = new_inode(sb);

        if (!inode) {
                *err = -ENOMEM;
                return NULL;
        }
        *err = -ENOSPC;

        iinfo = UDF_I(inode);
        if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
                iinfo->i_efe = 1;
                if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
                        sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
                iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
                                            sizeof(struct extendedFileEntry),
                                            GFP_KERNEL);
        } else {
                iinfo->i_efe = 0;
                iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
                                            sizeof(struct fileEntry),
                                            GFP_KERNEL);
        }
        if (!iinfo->i_ext.i_data) {
                iput(inode);
                *err = -ENOMEM;
                return NULL;
        }

        block = udf_new_block(dir->i_sb, NULL,
                              dinfo->i_location.partitionReferenceNum,
                              start, err);
        if (*err) {
                iput(inode);
                return NULL;
        }

        mutex_lock(&sbi->s_alloc_mutex);
        if (sbi->s_lvid_bh) {
                struct logicalVolIntegrityDesc *lvid =
                        (struct logicalVolIntegrityDesc *)
                        sbi->s_lvid_bh->b_data;
                struct logicalVolIntegrityDescImpUse *lvidiu =
                                                        udf_sb_lvidiu(sbi);
                struct logicalVolHeaderDesc *lvhd;
                uint64_t uniqueID;
                lvhd = (struct logicalVolHeaderDesc *)
                                (lvid->logicalVolContentsUse);
                if (S_ISDIR(mode))
                        le32_add_cpu(&lvidiu->numDirs, 1);
                else
                        le32_add_cpu(&lvidiu->numFiles, 1);
                iinfo->i_unique = uniqueID = le64_to_cpu(lvhd->uniqueID);
                if (!(++uniqueID & 0x00000000FFFFFFFFUL))
                        uniqueID += 16;
                lvhd->uniqueID = cpu_to_le64(uniqueID);
                mark_buffer_dirty(sbi->s_lvid_bh);
        }
        mutex_unlock(&sbi->s_alloc_mutex);
        inode->i_mode = mode;
        inode->i_uid = current->fsuid;
        if (dir->i_mode & S_ISGID) {
                inode->i_gid = dir->i_gid;
                if (S_ISDIR(mode))
                        mode |= S_ISGID;
        } else {
                inode->i_gid = current->fsgid;
        }

        iinfo->i_location.logicalBlockNum = block;
        iinfo->i_location.partitionReferenceNum =
                                dinfo->i_location.partitionReferenceNum;
        inode->i_ino = udf_get_lb_pblock(sb, iinfo->i_location, 0);
        inode->i_blocks = 0;
        iinfo->i_lenEAttr = 0;
        iinfo->i_lenAlloc = 0;
        iinfo->i_use = 0;
        if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
                iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
        else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
                iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
        else
                iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
        inode->i_mtime = inode->i_atime = inode->i_ctime =
                iinfo->i_crtime = current_fs_time(inode->i_sb);
        insert_inode_hash(inode);
        mark_inode_dirty(inode);

        if (DQUOT_ALLOC_INODE(inode)) {
                DQUOT_DROP(inode);
                inode->i_flags |= S_NOQUOTA;
                inode->i_nlink = 0;
                iput(inode);
                *err = -EDQUOT;
                return NULL;
        }

        *err = 0;
        return inode;
}