release/src-rt-6.x.4708/linux/linux-2.6.36/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         mutex_lock(&sbi->s_alloc_mutex);
  35         if (sbi->s_lvid_bh) {
  36                 struct logicalVolIntegrityDescImpUse *lvidiu =
  37                                                         udf_sb_lvidiu(sbi);
  38                 if (S_ISDIR(inode->i_mode))
  39                         le32_add_cpu(&lvidiu->numDirs, -1);
  40                 else
  41                         le32_add_cpu(&lvidiu->numFiles, -1);
  42                 udf_updated_lvid(sb);
  43         }
  44         mutex_unlock(&sbi->s_alloc_mutex);
  45
  46         udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);
  47 }
  48
  49 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  50 {
  51         struct super_block *sb = dir->i_sb;
  52         struct udf_sb_info *sbi = UDF_SB(sb);
  53         struct inode *inode;
  54         int block;
  55         uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
  56         struct udf_inode_info *iinfo;
  57         struct udf_inode_info *dinfo = UDF_I(dir);
  58
  59         inode = new_inode(sb);
  60
  61         if (!inode) {
  62                 *err = -ENOMEM;
  63                 return NULL;
  64         }
  65         *err = -ENOSPC;
  66
  67         iinfo = UDF_I(inode);
  68         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
  69                 iinfo->i_efe = 1;
  70                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
  71                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
  72                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  73                                             sizeof(struct extendedFileEntry),
  74                                             GFP_KERNEL);
  75         } else {
  76                 iinfo->i_efe = 0;
  77                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  78                                             sizeof(struct fileEntry),
  79                                             GFP_KERNEL);
  80         }
  81         if (!iinfo->i_ext.i_data) {
  82                 iput(inode);
  83                 *err = -ENOMEM;
  84                 return NULL;
  85         }
  86
  87         block = udf_new_block(dir->i_sb, NULL,
  88                               dinfo->i_location.partitionReferenceNum,
  89                               start, err);
  90         if (*err) {
  91                 iput(inode);
  92                 return NULL;
  93         }
  94
  95         mutex_lock(&sbi->s_alloc_mutex);
  96         if (sbi->s_lvid_bh) {
  97                 struct logicalVolIntegrityDesc *lvid =
  98                         (struct logicalVolIntegrityDesc *)
  99                         sbi->s_lvid_bh->b_data;
 100                 struct logicalVolIntegrityDescImpUse *lvidiu =
 101                                                         udf_sb_lvidiu(sbi);
 102                 struct logicalVolHeaderDesc *lvhd;
 103                 uint64_t uniqueID;
 104                 lvhd = (struct logicalVolHeaderDesc *)
 105                                 (lvid->logicalVolContentsUse);
 106                 if (S_ISDIR(mode))
 107                         le32_add_cpu(&lvidiu->numDirs, 1);
 108                 else
 109                         le32_add_cpu(&lvidiu->numFiles, 1);
 110                 iinfo->i_unique = uniqueID = le64_to_cpu(lvhd->uniqueID);
 111                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 112                         uniqueID += 16;
 113                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 114                 udf_updated_lvid(sb);
 115         }
 116         mutex_unlock(&sbi->s_alloc_mutex);
 117
 118         inode_init_owner(inode, dir, mode);
 119
 120         iinfo->i_location.logicalBlockNum = block;
 121         iinfo->i_location.partitionReferenceNum =
 122                                 dinfo->i_location.partitionReferenceNum;
 123         inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);
 124         inode->i_blocks = 0;
 125         iinfo->i_lenEAttr = 0;
 126         iinfo->i_lenAlloc = 0;
 127         iinfo->i_use = 0;
 128         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 129                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 130         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 131                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 132         else
 133                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 134         inode->i_mtime = inode->i_atime = inode->i_ctime =
 135                 iinfo->i_crtime = current_fs_time(inode->i_sb);
 136         insert_inode_hash(inode);
 137         mark_inode_dirty(inode);
 138
 139         *err = 0;
 140         return inode;
 141 }