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                         lvidiu->numDirs =
  50                                 cpu_to_le32(le32_to_cpu(lvidiu->numDirs) - 1);
  51                 else
  52                         lvidiu->numFiles =
  53                                 cpu_to_le32(le32_to_cpu(lvidiu->numFiles) - 1);
  54
  55                 mark_buffer_dirty(sbi->s_lvid_bh);
  56         }
  57         mutex_unlock(&sbi->s_alloc_mutex);
  58
  59         udf_free_blocks(sb, NULL, UDF_I(inode)->i_location, 0, 1);
  60 }
  61
  62 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  63 {
  64         struct super_block *sb = dir->i_sb;
  65         struct udf_sb_info *sbi = UDF_SB(sb);
  66         struct inode *inode;
  67         int block;
  68         uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
  69         struct udf_inode_info *iinfo;
  70         struct udf_inode_info *dinfo = UDF_I(dir);
  71
  72         inode = new_inode(sb);
  73
  74         if (!inode) {
  75                 *err = -ENOMEM;
  76                 return NULL;
  77         }
  78         *err = -ENOSPC;
  79
  80         iinfo = UDF_I(inode);
  81         iinfo->i_unique = 0;
  82         iinfo->i_lenExtents = 0;
  83         iinfo->i_next_alloc_block = 0;
  84         iinfo->i_next_alloc_goal = 0;
  85         iinfo->i_strat4096 = 0;
  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                         lvidiu->numDirs =
 108                                 cpu_to_le32(le32_to_cpu(lvidiu->numDirs) + 1);
 109                 else
 110                         lvidiu->numFiles =
 111                                 cpu_to_le32(le32_to_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                 mark_buffer_dirty(sbi->s_lvid_bh);
 117         }
 118         inode->i_mode = mode;
 119         inode->i_uid = current->fsuid;
 120         if (dir->i_mode & S_ISGID) {
 121                 inode->i_gid = dir->i_gid;
 122                 if (S_ISDIR(mode))
 123                         mode |= S_ISGID;
 124         } else {
 125                 inode->i_gid = current->fsgid;
 126         }
 127
 128         iinfo->i_location.logicalBlockNum = block;
 129         iinfo->i_location.partitionReferenceNum =
 130                                 dinfo->i_location.partitionReferenceNum;
 131         inode->i_ino = udf_get_lb_pblock(sb, iinfo->i_location, 0);
 132         inode->i_blocks = 0;
 133         iinfo->i_lenEAttr = 0;
 134         iinfo->i_lenAlloc = 0;
 135         iinfo->i_use = 0;
 136         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
 137                 iinfo->i_efe = 1;
 138                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
 139                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
 140                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 141                                             sizeof(struct extendedFileEntry),
 142                                             GFP_KERNEL);
 143         } else {
 144                 iinfo->i_efe = 0;
 145                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 146                                             sizeof(struct fileEntry),
 147                                             GFP_KERNEL);
 148         }
 149         if (!iinfo->i_ext.i_data) {
 150                 iput(inode);
 151                 *err = -ENOMEM;
 152                 mutex_unlock(&sbi->s_alloc_mutex);
 153                 return NULL;
 154         }
 155         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 156                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 157         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 158                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 159         else
 160                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 161         inode->i_mtime = inode->i_atime = inode->i_ctime =
 162                 iinfo->i_crtime = current_fs_time(inode->i_sb);
 163         insert_inode_hash(inode);
 164         mark_inode_dirty(inode);
 165         mutex_unlock(&sbi->s_alloc_mutex);
 166
 167         if (DQUOT_ALLOC_INODE(inode)) {
 168                 DQUOT_DROP(inode);
 169                 inode->i_flags |= S_NOQUOTA;
 170                 inode->i_nlink = 0;
 171                 iput(inode);
 172                 *err = -EDQUOT;
 173                 return NULL;
 174         }
 175
 176         *err = 0;
 177         return inode;
 178 }