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) 1998-1999 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/udf_fs.h>
  30
  31 #include "udf_i.h"
  32 #include "udf_sb.h"
  33
  34 void udf_free_inode(struct inode * inode)
  35 {
  36         struct super_block * sb = inode->i_sb;
  37         int is_directory;
  38         unsigned long ino;
  39
  40         if (!inode->i_dev)
  41         {
  42                 udf_debug("inode has no device\n");
  43                 return;
  44         }
  45         if (inode->i_count > 1)
  46         {
  47                 udf_debug("inode has count=%d\n", inode->i_count);
  48                 return;
  49         }
  50         if (inode->i_nlink)
  51         {
  52                 udf_debug("inode has nlink=%d\n", inode->i_nlink);
  53                 return;
  54         }
  55         if (!sb)
  56         {
  57                 udf_debug("inode on nonexistent device\n");
  58                 return;
  59         }
  60
  61         ino = inode->i_ino;
  62
  63         lock_super(sb);
  64
  65         is_directory = S_ISDIR(inode->i_mode);
  66
  67         clear_inode(inode);
  68
  69         if (UDF_SB_LVIDBH(sb))
  70         {
  71                 if (is_directory)
  72                         UDF_SB_LVIDIU(sb)->numDirs =
  73                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) - 1);
  74                 else
  75                         UDF_SB_LVIDIU(sb)->numFiles =
  76                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
  77
  78                 mark_buffer_dirty(UDF_SB_LVIDBH(sb), 1);
  79         }
  80
  81         unlock_super(sb);
  82
  83         udf_free_blocks(inode, UDF_I_LOCATION(inode), 0, 1);
  84 }
  85
  86 struct inode * udf_new_inode (const struct inode *dir, int mode, int * err)
  87 {
  88         struct super_block *sb;
  89         struct inode * inode;
  90         int block;
  91         Uint32 start = UDF_I_LOCATION(dir).logicalBlockNum;
  92
  93         inode = get_empty_inode();
  94         if (!inode)
  95         {
  96                 *err = -ENOMEM;
  97                 return NULL;
  98         }
  99         sb = dir->i_sb;
 100         inode->i_sb = sb;
 101         inode->i_flags = 0;
 102         *err = -ENOSPC;
 103
 104         block = udf_new_block(dir, UDF_I_LOCATION(dir).partitionReferenceNum,
 105                 start, err);
 106         if (*err)
 107         {
 108                 iput(inode);
 109                 return NULL;
 110         }
 111         lock_super(sb);
 112
 113         if (UDF_SB_LVIDBH(sb))
 114         {
 115                 struct LogicalVolHeaderDesc *lvhd;
 116                 Uint64 uniqueID;
 117                 lvhd = (struct LogicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
 118                 if (S_ISDIR(mode))
 119                         UDF_SB_LVIDIU(sb)->numDirs =
 120                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
 121                 else
 122                         UDF_SB_LVIDIU(sb)->numFiles =
 123                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
 124                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 125                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 126                         uniqueID += 16;
 127                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 128                 mark_buffer_dirty(UDF_SB_LVIDBH(sb), 1);
 129         }
 130         inode->i_mode = mode;
 131         inode->i_sb = sb;
 132         inode->i_nlink = 1;
 133         inode->i_dev = sb->s_dev;
 134         inode->i_uid = current->fsuid;
 135         if (dir->i_mode & S_ISGID)
 136         {
 137                 inode->i_gid = dir->i_gid;
 138                 if (S_ISDIR(mode))
 139                         mode |= S_ISGID;
 140         }
 141         else
 142                 inode->i_gid = current->fsgid;
 143         UDF_I_LOCATION(inode).logicalBlockNum = block;
 144         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 145         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 146         inode->i_blksize = PAGE_SIZE;
 147         inode->i_blocks = 0;
 148         inode->i_size = 0;
 149         UDF_I_LENEATTR(inode) = 0;
 150         UDF_I_LENALLOC(inode) = 0;
 151         UDF_I_EXT0LOC(inode) = UDF_I_LOCATION(inode);
 152         UDF_I_EXT0LEN(inode) = 0;
 153 #if 1
 154         UDF_I_EXT0OFFS(inode) = sizeof(struct FileEntry);
 155         UDF_I_ALLOCTYPE(inode) = ICB_FLAG_AD_IN_ICB;
 156 #else
 157         UDF_I_EXT0OFFS(inode) = 0;
 158         UDF_I_ALLOCTYPE(inode) = ICB_FLAG_AD_LONG;
 159 #endif
 160
 161         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 162         UDF_I_UMTIME(inode) = UDF_I_UATIME(inode) = UDF_I_UCTIME(inode) = CURRENT_UTIME;
 163         inode->i_op = NULL;
 164         insert_inode_hash(inode);
 165         mark_inode_dirty(inode);
 166         unlock_super(sb);
 167         *err = 0;
 168         return inode;
 169 }