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   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/udf_fs.h>
  25 #include <linux/sched.h>
  26 #include <linux/slab.h>
  27
  28 #include "udf_i.h"
  29 #include "udf_sb.h"
  30
  31 void udf_free_inode(struct inode *inode)
  32 {
  33         struct super_block *sb = inode->i_sb;
  34         struct udf_sb_info *sbi = UDF_SB(sb);
  35
  36         /*
  37          * Note: we must free any quota before locking the superblock,
  38          * as writing the quota to disk may need the lock as well.
  39          */
  40         DQUOT_FREE_INODE(inode);
  41         DQUOT_DROP(inode);
  42
  43         clear_inode(inode);
  44
  45         mutex_lock(&sbi->s_alloc_mutex);
  46         if (sbi->s_lvid_bh) {
  47                 struct logicalVolIntegrityDescImpUse *lvidiu =
  48                                                         udf_sb_lvidiu(sbi);
  49                 if (S_ISDIR(inode->i_mode))
  50                         lvidiu->numDirs =
  51                                 cpu_to_le32(le32_to_cpu(lvidiu->numDirs) - 1);
  52                 else
  53                         lvidiu->numFiles =
  54                                 cpu_to_le32(le32_to_cpu(lvidiu->numFiles) - 1);
  55
  56                 mark_buffer_dirty(sbi->s_lvid_bh);
  57         }
  58         mutex_unlock(&sbi->s_alloc_mutex);
  59
  60         udf_free_blocks(sb, NULL, UDF_I_LOCATION(inode), 0, 1);
  61 }
  62
  63 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  64 {
  65         struct super_block *sb = dir->i_sb;
  66         struct udf_sb_info *sbi = UDF_SB(sb);
  67         struct inode *inode;
  68         int block;
  69         uint32_t start = UDF_I_LOCATION(dir).logicalBlockNum;
  70
  71         inode = new_inode(sb);
  72
  73         if (!inode) {
  74                 *err = -ENOMEM;
  75                 return NULL;
  76         }
  77         *err = -ENOSPC;
  78
  79         UDF_I_UNIQUE(inode) = 0;
  80         UDF_I_LENEXTENTS(inode) = 0;
  81         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
  82         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
  83         UDF_I_STRAT4096(inode) = 0;
  84
  85         block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
  86                               start, err);
  87         if (*err) {
  88                 iput(inode);
  89                 return NULL;
  90         }
  91
  92         mutex_lock(&sbi->s_alloc_mutex);
  93         if (sbi->s_lvid_bh) {
  94                 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
  95                 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sbi);
  96                 struct logicalVolHeaderDesc *lvhd;
  97                 uint64_t uniqueID;
  98                 lvhd = (struct logicalVolHeaderDesc *)(lvid->logicalVolContentsUse);
  99                 if (S_ISDIR(mode))
 100                         lvidiu->numDirs =
 101                                 cpu_to_le32(le32_to_cpu(lvidiu->numDirs) + 1);
 102                 else
 103                         lvidiu->numFiles =
 104                                 cpu_to_le32(le32_to_cpu(lvidiu->numFiles) + 1);
 105                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 106                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 107                         uniqueID += 16;
 108                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 109                 mark_buffer_dirty(sbi->s_lvid_bh);
 110         }
 111         inode->i_mode = mode;
 112         inode->i_uid = current->fsuid;
 113         if (dir->i_mode & S_ISGID) {
 114                 inode->i_gid = dir->i_gid;
 115                 if (S_ISDIR(mode))
 116                         mode |= S_ISGID;
 117         } else {
 118                 inode->i_gid = current->fsgid;
 119         }
 120
 121         UDF_I_LOCATION(inode).logicalBlockNum = block;
 122         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 123         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 124         inode->i_blocks = 0;
 125         UDF_I_LENEATTR(inode) = 0;
 126         UDF_I_LENALLOC(inode) = 0;
 127         UDF_I_USE(inode) = 0;
 128         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
 129                 UDF_I_EFE(inode) = 1;
 130                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
 131                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
 132                 UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
 133         } else {
 134                 UDF_I_EFE(inode) = 0;
 135                 UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
 136         }
 137         if (!UDF_I_DATA(inode)) {
 138                 iput(inode);
 139                 *err = -ENOMEM;
 140                 mutex_unlock(&sbi->s_alloc_mutex);
 141                 return NULL;
 142         }
 143         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 144                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 145         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 146                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 147         else
 148                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 149         inode->i_mtime = inode->i_atime = inode->i_ctime =
 150                 UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
 151         insert_inode_hash(inode);
 152         mark_inode_dirty(inode);
 153         mutex_unlock(&sbi->s_alloc_mutex);
 154
 155         if (DQUOT_ALLOC_INODE(inode)) {
 156                 DQUOT_DROP(inode);
 157                 inode->i_flags |= S_NOQUOTA;
 158                 inode->i_nlink = 0;
 159                 iput(inode);
 160                 *err = -EDQUOT;
 161                 return NULL;
 162         }
 163
 164         *err = 0;
 165         return inode;
 166 }