fs/udf/ialloc.c

   1 /*
   2  * ialloc.c
   3  *
   4  * PURPOSE
   5  *      Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * CONTACTS
   8  *      E-mail regarding any portion of the Linux UDF file system should be
   9  *      directed to the development team mailing list (run by majordomo):
  10  *              linux_udf@hpesjro.fc.hp.com
  11  *
  12  * COPYRIGHT
  13  *      This file is distributed under the terms of the GNU General Public
  14  *      License (GPL). Copies of the GPL can be obtained from:
  15  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  16  *      Each contributing author retains all rights to their own work.
  17  *
  18  *  (C) 1998-2001 Ben Fennema
  19  *
  20  * HISTORY
  21  *
  22  *  02/24/99 blf  Created.
  23  *
  24  */
  25
  26 #include "udfdecl.h"
  27 #include <linux/fs.h>
  28 #include <linux/quotaops.h>
  29 #include <linux/udf_fs.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32
  33 #include "udf_i.h"
  34 #include "udf_sb.h"
  35
  36 void udf_free_inode(struct inode * inode)
  37 {
  38         struct super_block *sb = inode->i_sb;
  39         struct udf_sb_info *sbi = UDF_SB(sb);
  40
  41         /*
  42          * Note: we must free any quota before locking the superblock,
  43          * as writing the quota to disk may need the lock as well.
  44          */
  45         DQUOT_FREE_INODE(inode);
  46         DQUOT_DROP(inode);
  47
  48         clear_inode(inode);
  49
  50         down(&sbi->s_alloc_sem);
  51         if (sbi->s_lvidbh) {
  52                 if (S_ISDIR(inode->i_mode))
  53                         UDF_SB_LVIDIU(sb)->numDirs =
  54                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) - 1);
  55                 else
  56                         UDF_SB_LVIDIU(sb)->numFiles =
  57                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
  58
  59                 mark_buffer_dirty(sbi->s_lvidbh);
  60         }
  61         up(&sbi->s_alloc_sem);
  62
  63         udf_free_blocks(sb, NULL, UDF_I_LOCATION(inode), 0, 1);
  64 }
  65
  66 struct inode * udf_new_inode (struct inode *dir, int mode, int * err)
  67 {
  68         struct super_block *sb = dir->i_sb;
  69         struct udf_sb_info *sbi = UDF_SB(sb);
  70         struct inode * inode;
  71         int block;
  72         uint32_t start = UDF_I_LOCATION(dir).logicalBlockNum;
  73
  74         inode = new_inode(sb);
  75
  76         if (!inode)
  77         {
  78                 *err = -ENOMEM;
  79                 return NULL;
  80         }
  81         *err = -ENOSPC;
  82
  83         block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
  84                 start, err);
  85         if (*err)
  86         {
  87                 iput(inode);
  88                 return NULL;
  89         }
  90
  91         down(&sbi->s_alloc_sem);
  92         UDF_I_UNIQUE(inode) = 0;
  93         UDF_I_LENEXTENTS(inode) = 0;
  94         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
  95         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
  96         UDF_I_STRAT4096(inode) = 0;
  97         if (UDF_SB_LVIDBH(sb))
  98         {
  99                 struct logicalVolHeaderDesc *lvhd;
 100                 uint64_t uniqueID;
 101                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
 102                 if (S_ISDIR(mode))
 103                         UDF_SB_LVIDIU(sb)->numDirs =
 104                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
 105                 else
 106                         UDF_SB_LVIDIU(sb)->numFiles =
 107                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
 108                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 109                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 110                         uniqueID += 16;
 111                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 112                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
 113         }
 114         inode->i_mode = mode;
 115         inode->i_uid = current->fsuid;
 116         if (dir->i_mode & S_ISGID)
 117         {
 118                 inode->i_gid = dir->i_gid;
 119                 if (S_ISDIR(mode))
 120                         mode |= S_ISGID;
 121         }
 122         else
 123                 inode->i_gid = current->fsgid;
 124
 125         UDF_I_LOCATION(inode).logicalBlockNum = block;
 126         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 127         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 128         inode->i_blksize = PAGE_SIZE;
 129         inode->i_blocks = 0;
 130         UDF_I_LENEATTR(inode) = 0;
 131         UDF_I_LENALLOC(inode) = 0;
 132         UDF_I_USE(inode) = 0;
 133         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE))
 134         {
 135                 UDF_I_EFE(inode) = 1;
 136                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
 137                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
 138                 memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
 139         }
 140         else
 141         {
 142                 UDF_I_EFE(inode) = 0;
 143                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
 144                 memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct fileEntry));
 145         }
 146         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 147                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 148         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 149                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 150         else
 151                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 152         inode->i_mtime = inode->i_atime = inode->i_ctime =
 153                 UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
 154         insert_inode_hash(inode);
 155         mark_inode_dirty(inode);
 156         up(&sbi->s_alloc_sem);
 157
 158         if (DQUOT_ALLOC_INODE(inode))
 159         {
 160                 DQUOT_DROP(inode);
 161                 inode->i_flags |= S_NOQUOTA;
 162                 inode->i_nlink = 0;
 163                 iput(inode);
 164                 *err = -EDQUOT;
 165                 return NULL;
 166         }
 167
 168         *err = 0;
 169         return inode;
 170 }