fs/udf/ialloc.c

   1 /*
   2  * ialloc.c
   3  *
   4  * PURPOSE
   5  *      Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2001 Ben Fennema
  14  *
  15  * HISTORY
  16  *
  17  *  02/24/99 blf  Created.
  18  *
  19  */
  20
  21 #include "udfdecl.h"
  22 #include <linux/fs.h>
  23 #include <linux/sched.h>
  24 #include <linux/slab.h>
  25
  26 #include "udf_i.h"
  27 #include "udf_sb.h"
  28
  29 void udf_free_inode(struct inode *inode)
  30 {
  31         struct super_block *sb = inode->i_sb;
  32         struct udf_sb_info *sbi = UDF_SB(sb);
  33
  34         clear_inode(inode);
  35
  36         mutex_lock(&sbi->s_alloc_mutex);
  37         if (sbi->s_lvid_bh) {
  38                 struct logicalVolIntegrityDescImpUse *lvidiu =
  39                                                         udf_sb_lvidiu(sbi);
  40                 if (S_ISDIR(inode->i_mode))
  41                         le32_add_cpu(&lvidiu->numDirs, -1);
  42                 else
  43                         le32_add_cpu(&lvidiu->numFiles, -1);
  44                 udf_updated_lvid(sb);
  45         }
  46         mutex_unlock(&sbi->s_alloc_mutex);
  47
  48         udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);
  49 }
  50
  51 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  52 {
  53         struct super_block *sb = dir->i_sb;
  54         struct udf_sb_info *sbi = UDF_SB(sb);
  55         struct inode *inode;
  56         int block;
  57         uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
  58         struct udf_inode_info *iinfo;
  59         struct udf_inode_info *dinfo = UDF_I(dir);
  60
  61         inode = new_inode(sb);
  62
  63         if (!inode) {
  64                 *err = -ENOMEM;
  65                 return NULL;
  66         }
  67         *err = -ENOSPC;
  68
  69         iinfo = UDF_I(inode);
  70         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
  71                 iinfo->i_efe = 1;
  72                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
  73                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
  74                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  75                                             sizeof(struct extendedFileEntry),
  76                                             GFP_KERNEL);
  77         } else {
  78                 iinfo->i_efe = 0;
  79                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  80                                             sizeof(struct fileEntry),
  81                                             GFP_KERNEL);
  82         }
  83         if (!iinfo->i_ext.i_data) {
  84                 iput(inode);
  85                 *err = -ENOMEM;
  86                 return NULL;
  87         }
  88
  89         block = udf_new_block(dir->i_sb, NULL,
  90                               dinfo->i_location.partitionReferenceNum,
  91                               start, err);
  92         if (*err) {
  93                 iput(inode);
  94                 return NULL;
  95         }
  96
  97         mutex_lock(&sbi->s_alloc_mutex);
  98         if (sbi->s_lvid_bh) {
  99                 struct logicalVolIntegrityDesc *lvid =
 100                         (struct logicalVolIntegrityDesc *)
 101                         sbi->s_lvid_bh->b_data;
 102                 struct logicalVolIntegrityDescImpUse *lvidiu =
 103                                                         udf_sb_lvidiu(sbi);
 104                 struct logicalVolHeaderDesc *lvhd;
 105                 uint64_t uniqueID;
 106                 lvhd = (struct logicalVolHeaderDesc *)
 107                                 (lvid->logicalVolContentsUse);
 108                 if (S_ISDIR(mode))
 109                         le32_add_cpu(&lvidiu->numDirs, 1);
 110                 else
 111                         le32_add_cpu(&lvidiu->numFiles, 1);
 112                 iinfo->i_unique = uniqueID = le64_to_cpu(lvhd->uniqueID);
 113                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 114                         uniqueID += 16;
 115                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 116                 udf_updated_lvid(sb);
 117         }
 118         mutex_unlock(&sbi->s_alloc_mutex);
 119
 120         inode_init_owner(inode, dir, mode);
 121
 122         iinfo->i_location.logicalBlockNum = block;
 123         iinfo->i_location.partitionReferenceNum =
 124                                 dinfo->i_location.partitionReferenceNum;
 125         inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);
 126         inode->i_blocks = 0;
 127         iinfo->i_lenEAttr = 0;
 128         iinfo->i_lenAlloc = 0;
 129         iinfo->i_use = 0;
 130         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 131                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 132         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 133                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 134         else
 135                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 136         inode->i_mtime = inode->i_atime = inode->i_ctime =
 137                 iinfo->i_crtime = current_fs_time(inode->i_sb);
 138         insert_inode_hash(inode);
 139         mark_inode_dirty(inode);
 140
 141         *err = 0;
 142         return inode;
 143 }