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@hootie.lvld.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) 1998-2000 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/locks.h>
  29 #include <linux/quotaops.h>
  30 #include <linux/udf_fs.h>
  31
  32 #include "udf_i.h"
  33 #include "udf_sb.h"
  34
  35 void udf_free_inode(struct inode * inode)
  36 {
  37         struct super_block * sb = inode->i_sb;
  38         int is_directory;
  39         unsigned long ino;
  40
  41         ino = inode->i_ino;
  42
  43         /*
  44          * Note: we must free any quota before locking the superblock,
  45          * as writing the quota to disk may need the lock as well.
  46          */
  47         DQUOT_FREE_INODE(sb, inode);
  48         DQUOT_DROP(inode);
  49
  50         lock_super(sb);
  51
  52         is_directory = S_ISDIR(inode->i_mode);
  53
  54         clear_inode(inode);
  55
  56         if (UDF_SB_LVIDBH(sb))
  57         {
  58                 if (is_directory)
  59                         UDF_SB_LVIDIU(sb)->numDirs =
  60                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) - 1);
  61                 else
  62                         UDF_SB_LVIDIU(sb)->numFiles =
  63                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
  64
  65                 mark_buffer_dirty(UDF_SB_LVIDBH(sb), 1);
  66         }
  67
  68         unlock_super(sb);
  69
  70         udf_free_blocks(inode, UDF_I_LOCATION(inode), 0, 1);
  71 }
  72
  73 struct inode * udf_new_inode (const struct inode *dir, int mode, int * err)
  74 {
  75         struct super_block *sb;
  76         struct inode * inode;
  77         int block;
  78         Uint32 start = UDF_I_LOCATION(dir).logicalBlockNum;
  79
  80         inode = get_empty_inode();
  81         if (!inode)
  82         {
  83                 *err = -ENOMEM;
  84                 return NULL;
  85         }
  86         sb = dir->i_sb;
  87         inode->i_sb = sb;
  88         inode->i_flags = 0;
  89         *err = -ENOSPC;
  90
  91         block = udf_new_block(dir, UDF_I_LOCATION(dir).partitionReferenceNum,
  92                 start, err);
  93         if (*err)
  94         {
  95                 iput(inode);
  96                 return NULL;
  97         }
  98         lock_super(sb);
  99
 100         if (UDF_SB_LVIDBH(sb))
 101         {
 102                 struct LogicalVolHeaderDesc *lvhd;
 103                 Uint64 uniqueID;
 104                 lvhd = (struct LogicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
 105                 if (S_ISDIR(mode))
 106                         UDF_SB_LVIDIU(sb)->numDirs =
 107                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
 108                 else
 109                         UDF_SB_LVIDIU(sb)->numFiles =
 110                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
 111                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 112                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 113                         uniqueID += 16;
 114                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 115                 mark_buffer_dirty(UDF_SB_LVIDBH(sb), 1);
 116         }
 117         inode->i_mode = mode;
 118         inode->i_sb = sb;
 119         inode->i_nlink = 1;
 120         inode->i_dev = sb->s_dev;
 121         inode->i_uid = current->fsuid;
 122         if (test_opt (sb, GRPID))
 123                 inode->i_gid = dir->i_gid;
 124         else if (dir->i_mode & S_ISGID)
 125         {
 126                 inode->i_gid = dir->i_gid;
 127                 if (S_ISDIR(mode))
 128                         mode |= S_ISGID;
 129         }
 130         else
 131                 inode->i_gid = current->fsgid;
 132
 133         UDF_I_LOCATION(inode).logicalBlockNum = block;
 134         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 135         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 136         inode->i_blksize = PAGE_SIZE;
 137         inode->i_blocks = 0;
 138         inode->i_size = 0;
 139         UDF_I_LENEATTR(inode) = 0;
 140         UDF_I_LENALLOC(inode) = 0;
 141         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE))
 142         {
 143                 UDF_I_EXTENDED_FE(inode) = 1;
 144                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
 145         }
 146         else
 147                 UDF_I_EXTENDED_FE(inode) = 0;
 148         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 149                 UDF_I_ALLOCTYPE(inode) = ICB_FLAG_AD_IN_ICB;
 150         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 151                 UDF_I_ALLOCTYPE(inode) = ICB_FLAG_AD_SHORT;
 152         else
 153                 UDF_I_ALLOCTYPE(inode) = ICB_FLAG_AD_LONG;
 154         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 155         UDF_I_UMTIME(inode) = UDF_I_UATIME(inode) = UDF_I_UCTIME(inode) = CURRENT_UTIME;
 156         UDF_I_NEW_INODE(inode) = 1;
 157         insert_inode_hash(inode);
 158         mark_inode_dirty(inode);
 159
 160         unlock_super(sb);
 161         if (DQUOT_ALLOC_INODE(sb, inode))
 162         {
 163                 sb->dq_op->drop(inode);
 164                 inode->i_nlink = 0;
 165                 iput(inode);
 166                 *err = -EDQUOT;
 167                 return NULL;
 168         }
 169
 170         *err = 0;
 171         return inode;
 172 }