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         int is_directory;
  40         unsigned long ino;
  41
  42         ino = inode->i_ino;
  43
  44         /*
  45          * Note: we must free any quota before locking the superblock,
  46          * as writing the quota to disk may need the lock as well.
  47          */
  48         DQUOT_FREE_INODE(inode);
  49         DQUOT_DROP(inode);
  50
  51         lock_super(sb);
  52
  53         is_directory = S_ISDIR(inode->i_mode);
  54
  55         clear_inode(inode);
  56
  57         if (UDF_SB_LVIDBH(sb))
  58         {
  59                 if (is_directory)
  60                         UDF_SB_LVIDIU(sb)->numDirs =
  61                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) - 1);
  62                 else
  63                         UDF_SB_LVIDIU(sb)->numFiles =
  64                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
  65
  66                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
  67         }
  68         unlock_super(sb);
  69
  70         udf_free_blocks(sb, NULL, UDF_I_LOCATION(inode), 0, 1);
  71 }
  72
  73 struct inode * udf_new_inode (struct inode *dir, int mode, int * err)
  74 {
  75         struct super_block *sb;
  76         struct inode * inode;
  77         int block;
  78         uint32_t start = UDF_I_LOCATION(dir).logicalBlockNum;
  79
  80         sb = dir->i_sb;
  81         inode = new_inode(sb);
  82
  83         if (!inode)
  84         {
  85                 *err = -ENOMEM;
  86                 return NULL;
  87         }
  88         *err = -ENOSPC;
  89
  90         block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
  91                 start, err);
  92         if (*err)
  93         {
  94                 iput(inode);
  95                 return NULL;
  96         }
  97         lock_super(sb);
  98
  99         UDF_I_UNIQUE(inode) = 0;
 100         UDF_I_LENEXTENTS(inode) = 0;
 101         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
 102         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
 103         UDF_I_STRAT4096(inode) = 0;
 104         if (UDF_SB_LVIDBH(sb))
 105         {
 106                 struct logicalVolHeaderDesc *lvhd;
 107                 uint64_t uniqueID;
 108                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
 109                 if (S_ISDIR(mode))
 110                         UDF_SB_LVIDIU(sb)->numDirs =
 111                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
 112                 else
 113                         UDF_SB_LVIDIU(sb)->numFiles =
 114                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
 115                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 116                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 117                         uniqueID += 16;
 118                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 119                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
 120         }
 121         inode->i_mode = mode;
 122         inode->i_uid = current->fsuid;
 123         if (dir->i_mode & S_ISGID)
 124         {
 125                 inode->i_gid = dir->i_gid;
 126                 if (S_ISDIR(mode))
 127                         mode |= S_ISGID;
 128         }
 129         else
 130                 inode->i_gid = current->fsgid;
 131
 132         UDF_I_LOCATION(inode).logicalBlockNum = block;
 133         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 134         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 135         inode->i_blksize = PAGE_SIZE;
 136         inode->i_blocks = 0;
 137         UDF_I_LENEATTR(inode) = 0;
 138         UDF_I_LENALLOC(inode) = 0;
 139         UDF_I_USE(inode) = 0;
 140         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE))
 141         {
 142                 UDF_I_EFE(inode) = 1;
 143                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
 144                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
 145                 memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
 146         }
 147         else
 148         {
 149                 UDF_I_EFE(inode) = 0;
 150                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
 151                 memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct fileEntry));
 152         }
 153         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 154                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 155         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 156                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 157         else
 158                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 159         inode->i_mtime = inode->i_atime = inode->i_ctime =
 160                 UDF_I_CRTIME(inode) = CURRENT_TIME;
 161         insert_inode_hash(inode);
 162         mark_inode_dirty(inode);
 163
 164         unlock_super(sb);
 165         if (DQUOT_ALLOC_INODE(inode))
 166         {
 167                 DQUOT_DROP(inode);
 168                 inode->i_flags |= S_NOQUOTA;
 169                 inode->i_nlink = 0;
 170                 iput(inode);
 171                 *err = -EDQUOT;
 172                 return NULL;
 173         }
 174
 175         *err = 0;
 176         return inode;
 177 }