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) - 1);
  50                 else
  51                         UDF_SB_LVIDIU(sb)->numFiles =
  52                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
  53
  54                 mark_buffer_dirty(sbi->s_lvidbh);
  55         }
  56         mutex_unlock(&sbi->s_alloc_mutex);
  57
  58         udf_free_blocks(sb, NULL, UDF_I_LOCATION(inode), 0, 1);
  59 }
  60
  61 struct inode * udf_new_inode (struct inode *dir, int mode, int * err)
  62 {
  63         struct super_block *sb = dir->i_sb;
  64         struct udf_sb_info *sbi = UDF_SB(sb);
  65         struct inode * inode;
  66         int block;
  67         uint32_t start = UDF_I_LOCATION(dir).logicalBlockNum;
  68
  69         inode = new_inode(sb);
  70
  71         if (!inode)
  72         {
  73                 *err = -ENOMEM;
  74                 return NULL;
  75         }
  76         *err = -ENOSPC;
  77
  78         block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
  79                 start, err);
  80         if (*err)
  81         {
  82                 iput(inode);
  83                 return NULL;
  84         }
  85
  86         mutex_lock(&sbi->s_alloc_mutex);
  87         UDF_I_UNIQUE(inode) = 0;
  88         UDF_I_LENEXTENTS(inode) = 0;
  89         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
  90         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
  91         UDF_I_STRAT4096(inode) = 0;
  92         if (UDF_SB_LVIDBH(sb))
  93         {
  94                 struct logicalVolHeaderDesc *lvhd;
  95                 uint64_t uniqueID;
  96                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
  97                 if (S_ISDIR(mode))
  98                         UDF_SB_LVIDIU(sb)->numDirs =
  99                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
 100                 else
 101                         UDF_SB_LVIDIU(sb)->numFiles =
 102                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
 103                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 104                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 105                         uniqueID += 16;
 106                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 107                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
 108         }
 109         inode->i_mode = mode;
 110         inode->i_uid = current->fsuid;
 111         if (dir->i_mode & S_ISGID)
 112         {
 113                 inode->i_gid = dir->i_gid;
 114                 if (S_ISDIR(mode))
 115                         mode |= S_ISGID;
 116         }
 117         else
 118                 inode->i_gid = current->fsgid;
 119
 120         UDF_I_LOCATION(inode).logicalBlockNum = block;
 121         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 122         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 123         inode->i_blksize = PAGE_SIZE;
 124         inode->i_blocks = 0;
 125         UDF_I_LENEATTR(inode) = 0;
 126         UDF_I_LENALLOC(inode) = 0;
 127         UDF_I_USE(inode) = 0;
 128         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE))
 129         {
 130                 UDF_I_EFE(inode) = 1;
 131                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
 132                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
 133                 memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
 134         }
 135         else
 136         {
 137                 UDF_I_EFE(inode) = 0;
 138                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
 139                 memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct fileEntry));
 140         }
 141         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 142                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 143         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 144                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 145         else
 146                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 147         inode->i_mtime = inode->i_atime = inode->i_ctime =
 148                 UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
 149         insert_inode_hash(inode);
 150         mark_inode_dirty(inode);
 151         mutex_unlock(&sbi->s_alloc_mutex);
 152
 153         if (DQUOT_ALLOC_INODE(inode))
 154         {
 155                 DQUOT_DROP(inode);
 156                 inode->i_flags |= S_NOQUOTA;
 157                 inode->i_nlink = 0;
 158                 iput(inode);
 159                 *err = -EDQUOT;
 160                 return NULL;
 161         }
 162
 163         *err = 0;
 164         return inode;
 165 }