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/quotaops.h>
  24 #include <linux/sched.h>
  25 #include <linux/slab.h>
  26
  27 #include "udf_i.h"
  28 #include "udf_sb.h"
  29
  30 void udf_free_inode(struct inode *inode)
  31 {
  32         struct super_block *sb = inode->i_sb;
  33         struct udf_sb_info *sbi = UDF_SB(sb);
  34
  35         /*
  36          * Note: we must free any quota before locking the superblock,
  37          * as writing the quota to disk may need the lock as well.
  38          */
  39         DQUOT_FREE_INODE(inode);
  40         DQUOT_DROP(inode);
  41
  42         clear_inode(inode);
  43
  44         mutex_lock(&sbi->s_alloc_mutex);
  45         if (sbi->s_lvid_bh) {
  46                 struct logicalVolIntegrityDescImpUse *lvidiu =
  47                                                         udf_sb_lvidiu(sbi);
  48                 if (S_ISDIR(inode->i_mode))
  49                         le32_add_cpu(&lvidiu->numDirs, -1);
  50                 else
  51                         le32_add_cpu(&lvidiu->numFiles, -1);
  52
  53                 mark_buffer_dirty(sbi->s_lvid_bh);
  54         }
  55         mutex_unlock(&sbi->s_alloc_mutex);
  56
  57         udf_free_blocks(sb, NULL, UDF_I(inode)->i_location, 0, 1);
  58 }
  59
  60 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  61 {
  62         struct super_block *sb = dir->i_sb;
  63         struct udf_sb_info *sbi = UDF_SB(sb);
  64         struct inode *inode;
  65         int block;
  66         uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
  67         struct udf_inode_info *iinfo;
  68         struct udf_inode_info *dinfo = UDF_I(dir);
  69
  70         inode = new_inode(sb);
  71
  72         if (!inode) {
  73                 *err = -ENOMEM;
  74                 return NULL;
  75         }
  76         *err = -ENOSPC;
  77
  78         iinfo = UDF_I(inode);
  79         iinfo->i_unique = 0;
  80         iinfo->i_lenExtents = 0;
  81         iinfo->i_next_alloc_block = 0;
  82         iinfo->i_next_alloc_goal = 0;
  83         iinfo->i_strat4096 = 0;
  84
  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 NULL;
  91         }
  92
  93         mutex_lock(&sbi->s_alloc_mutex);
  94         if (sbi->s_lvid_bh) {
  95                 struct logicalVolIntegrityDesc *lvid =
  96                         (struct logicalVolIntegrityDesc *)
  97                         sbi->s_lvid_bh->b_data;
  98                 struct logicalVolIntegrityDescImpUse *lvidiu =
  99                                                         udf_sb_lvidiu(sbi);
 100                 struct logicalVolHeaderDesc *lvhd;
 101                 uint64_t uniqueID;
 102                 lvhd = (struct logicalVolHeaderDesc *)
 103                                 (lvid->logicalVolContentsUse);
 104                 if (S_ISDIR(mode))
 105                         le32_add_cpu(&lvidiu->numDirs, 1);
 106                 else
 107                         le32_add_cpu(&lvidiu->numFiles, 1);
 108                 iinfo->i_unique = uniqueID = le64_to_cpu(lvhd->uniqueID);
 109                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 110                         uniqueID += 16;
 111                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 112                 mark_buffer_dirty(sbi->s_lvid_bh);
 113         }
 114         mutex_unlock(&sbi->s_alloc_mutex);
 115         inode->i_mode = mode;
 116         inode->i_uid = current->fsuid;
 117         if (dir->i_mode & S_ISGID) {
 118                 inode->i_gid = dir->i_gid;
 119                 if (S_ISDIR(mode))
 120                         mode |= S_ISGID;
 121         } else {
 122                 inode->i_gid = current->fsgid;
 123         }
 124
 125         iinfo->i_location.logicalBlockNum = block;
 126         iinfo->i_location.partitionReferenceNum =
 127                                 dinfo->i_location.partitionReferenceNum;
 128         inode->i_ino = udf_get_lb_pblock(sb, iinfo->i_location, 0);
 129         inode->i_blocks = 0;
 130         iinfo->i_lenEAttr = 0;
 131         iinfo->i_lenAlloc = 0;
 132         iinfo->i_use = 0;
 133         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
 134                 iinfo->i_efe = 1;
 135                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
 136                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
 137                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 138                                             sizeof(struct extendedFileEntry),
 139                                             GFP_KERNEL);
 140         } else {
 141                 iinfo->i_efe = 0;
 142                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 143                                             sizeof(struct fileEntry),
 144                                             GFP_KERNEL);
 145         }
 146         if (!iinfo->i_ext.i_data) {
 147                 iput(inode);
 148                 *err = -ENOMEM;
 149                 return NULL;
 150         }
 151         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 152                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 153         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 154                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 155         else
 156                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 157         inode->i_mtime = inode->i_atime = inode->i_ctime =
 158                 iinfo->i_crtime = current_fs_time(inode->i_sb);
 159         insert_inode_hash(inode);
 160         mark_inode_dirty(inode);
 161
 162         if (DQUOT_ALLOC_INODE(inode)) {
 163                 DQUOT_DROP(inode);
 164                 inode->i_flags |= S_NOQUOTA;
 165                 inode->i_nlink = 0;
 166                 iput(inode);
 167                 *err = -EDQUOT;
 168                 return NULL;
 169         }
 170
 171         *err = 0;
 172         return inode;
 173 }