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         struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
  34
  35         if (lvidiu) {
  36                 mutex_lock(&sbi->s_alloc_mutex);
  37                 if (S_ISDIR(inode->i_mode))
  38                         le32_add_cpu(&lvidiu->numDirs, -1);
  39                 else
  40                         le32_add_cpu(&lvidiu->numFiles, -1);
  41                 udf_updated_lvid(sb);
  42                 mutex_unlock(&sbi->s_alloc_mutex);
  43         }
  44
  45         udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);
  46 }
  47
  48 struct inode *udf_new_inode(struct inode *dir, umode_t mode)
  49 {
  50         struct super_block *sb = dir->i_sb;
  51         struct udf_sb_info *sbi = UDF_SB(sb);
  52         struct inode *inode;
  53         udf_pblk_t block;
  54         uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
  55         struct udf_inode_info *iinfo;
  56         struct udf_inode_info *dinfo = UDF_I(dir);
  57         struct logicalVolIntegrityDescImpUse *lvidiu;
  58         int err;
  59
  60         inode = new_inode(sb);
  61
  62         if (!inode)
  63                 return ERR_PTR(-ENOMEM);
  64
  65         iinfo = UDF_I(inode);
  66         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
  67                 iinfo->i_efe = 1;
  68                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
  69                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
  70                 iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
  71                                         sizeof(struct extendedFileEntry),
  72                                         GFP_KERNEL);
  73         } else {
  74                 iinfo->i_efe = 0;
  75                 iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
  76                                         sizeof(struct fileEntry),
  77                                         GFP_KERNEL);
  78         }
  79         if (!iinfo->i_data) {
  80                 iput(inode);
  81                 return ERR_PTR(-ENOMEM);
  82         }
  83
  84         err = -ENOSPC;
  85         block = udf_new_block(dir->i_sb, NULL,
  86                               dinfo->i_location.partitionReferenceNum,
  87                               start, &err);
  88         if (err) {
  89                 iput(inode);
  90                 return ERR_PTR(err);
  91         }
  92
  93         lvidiu = udf_sb_lvidiu(sb);
  94         if (lvidiu) {
  95                 iinfo->i_unique = lvid_get_unique_id(sb);
  96                 inode->i_generation = iinfo->i_unique;
  97                 mutex_lock(&sbi->s_alloc_mutex);
  98                 if (S_ISDIR(mode))
  99                         le32_add_cpu(&lvidiu->numDirs, 1);
 100                 else
 101                         le32_add_cpu(&lvidiu->numFiles, 1);
 102                 udf_updated_lvid(sb);
 103                 mutex_unlock(&sbi->s_alloc_mutex);
 104         }
 105
 106         inode_init_owner(inode, dir, mode);
 107         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 108                 inode->i_uid = sbi->s_uid;
 109         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
 110                 inode->i_gid = sbi->s_gid;
 111
 112         iinfo->i_location.logicalBlockNum = block;
 113         iinfo->i_location.partitionReferenceNum =
 114                                 dinfo->i_location.partitionReferenceNum;
 115         inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);
 116         inode->i_blocks = 0;
 117         iinfo->i_lenEAttr = 0;
 118         iinfo->i_lenAlloc = 0;
 119         iinfo->i_use = 0;
 120         iinfo->i_checkpoint = 1;
 121         iinfo->i_extraPerms = FE_PERM_U_CHATTR;
 122         udf_update_extra_perms(inode, mode);
 123
 124         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 125                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 126         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 127                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 128         else
 129                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 130         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 131         iinfo->i_crtime = inode->i_mtime;
 132         if (unlikely(insert_inode_locked(inode) < 0)) {
 133                 make_bad_inode(inode);
 134                 iput(inode);
 135                 return ERR_PTR(-EIO);
 136         }
 137         mark_inode_dirty(inode);
 138
 139         return inode;
 140 }