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/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_lvidbh) {
  47                 if (S_ISDIR(inode->i_mode))
  48                         UDF_SB_LVIDIU(sb)->numDirs =
  49                             cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)
  50                                         - 1);
  51                 else
  52                         UDF_SB_LVIDIU(sb)->numFiles =
  53                             cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles)
  54                                         - 1);
  55
  56                 mark_buffer_dirty(sbi->s_lvidbh);
  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 =
  86             udf_new_block(dir->i_sb, NULL,
  87                           UDF_I_LOCATION(dir).partitionReferenceNum, start,
  88                           err);
  89         if (*err) {
  90                 iput(inode);
  91                 return NULL;
  92         }
  93
  94         mutex_lock(&sbi->s_alloc_mutex);
  95         if (UDF_SB_LVIDBH(sb)) {
  96                 struct logicalVolHeaderDesc *lvhd;
  97                 uint64_t uniqueID;
  98                 lvhd =
  99                     (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->
 100                                                     logicalVolContentsUse);
 101                 if (S_ISDIR(mode))
 102                         UDF_SB_LVIDIU(sb)->numDirs =
 103                             cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)
 104                                         + 1);
 105                 else
 106                         UDF_SB_LVIDIU(sb)->numFiles =
 107                             cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles)
 108                                         + 1);
 109                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 110                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 111                         uniqueID += 16;
 112                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 113                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
 114         }
 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         UDF_I_LOCATION(inode).logicalBlockNum = block;
 125         UDF_I_LOCATION(inode).partitionReferenceNum =
 126             UDF_I_LOCATION(dir).partitionReferenceNum;
 127         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 128         inode->i_blocks = 0;
 129         UDF_I_LENEATTR(inode) = 0;
 130         UDF_I_LENALLOC(inode) = 0;
 131         UDF_I_USE(inode) = 0;
 132         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
 133                 UDF_I_EFE(inode) = 1;
 134                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
 135                 UDF_I_DATA(inode) =
 136                     kzalloc(inode->i_sb->s_blocksize -
 137                             sizeof(struct extendedFileEntry), GFP_KERNEL);
 138         } else {
 139                 UDF_I_EFE(inode) = 0;
 140                 UDF_I_DATA(inode) =
 141                     kzalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry),
 142                             GFP_KERNEL);
 143         }
 144         if (!UDF_I_DATA(inode)) {
 145                 iput(inode);
 146                 *err = -ENOMEM;
 147                 mutex_unlock(&sbi->s_alloc_mutex);
 148                 return NULL;
 149         }
 150         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 151                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 152         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 153                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 154         else
 155                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 156         inode->i_mtime = inode->i_atime = inode->i_ctime =
 157             UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
 158         insert_inode_hash(inode);
 159         mark_inode_dirty(inode);
 160         mutex_unlock(&sbi->s_alloc_mutex);
 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 }