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   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/sched.h>
  25 #include <linux/slab.h>
  26
  27 #include "udf_i.h"
  28 #include "udf_sb.h"
  29
  30 void udf_free_inode(struct inode *inode)
  31 {
  32         struct super_block *sb = inode->i_sb;
  33         struct udf_sb_info *sbi = UDF_SB(sb);
  34
  35         /*
  36          * Note: we must free any quota before locking the superblock,
  37          * as writing the quota to disk may need the lock as well.
  38          */
  39         dquot_free_inode(inode);
  40         dquot_drop(inode);
  41
  42         clear_inode(inode);
  43
  44         mutex_lock(&sbi->s_alloc_mutex);
  45         if (sbi->s_lvid_bh) {
  46                 struct logicalVolIntegrityDescImpUse *lvidiu =
  47                                                         udf_sb_lvidiu(sbi);
  48                 if (S_ISDIR(inode->i_mode))
  49                         le32_add_cpu(&lvidiu->numDirs, -1);
  50                 else
  51                         le32_add_cpu(&lvidiu->numFiles, -1);
  52                 udf_updated_lvid(sb);
  53         }
  54         mutex_unlock(&sbi->s_alloc_mutex);
  55
  56         udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);
  57 }
  58
  59 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  60 {
  61         struct super_block *sb = dir->i_sb;
  62         struct udf_sb_info *sbi = UDF_SB(sb);
  63         struct inode *inode;
  64         int block, ret;
  65         uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
  66         struct udf_inode_info *iinfo;
  67         struct udf_inode_info *dinfo = UDF_I(dir);
  68
  69         inode = new_inode(sb);
  70
  71         if (!inode) {
  72                 *err = -ENOMEM;
  73                 return NULL;
  74         }
  75         *err = -ENOSPC;
  76
  77         iinfo = UDF_I(inode);
  78         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
  79                 iinfo->i_efe = 1;
  80                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
  81                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
  82                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  83                                             sizeof(struct extendedFileEntry),
  84                                             GFP_KERNEL);
  85         } else {
  86                 iinfo->i_efe = 0;
  87                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
  88                                             sizeof(struct fileEntry),
  89                                             GFP_KERNEL);
  90         }
  91         if (!iinfo->i_ext.i_data) {
  92                 iput(inode);
  93                 *err = -ENOMEM;
  94                 return NULL;
  95         }
  96
  97         block = udf_new_block(dir->i_sb, NULL,
  98                               dinfo->i_location.partitionReferenceNum,
  99                               start, err);
 100         if (*err) {
 101                 iput(inode);
 102                 return NULL;
 103         }
 104
 105         mutex_lock(&sbi->s_alloc_mutex);
 106         if (sbi->s_lvid_bh) {
 107                 struct logicalVolIntegrityDesc *lvid =
 108                         (struct logicalVolIntegrityDesc *)
 109                         sbi->s_lvid_bh->b_data;
 110                 struct logicalVolIntegrityDescImpUse *lvidiu =
 111                                                         udf_sb_lvidiu(sbi);
 112                 struct logicalVolHeaderDesc *lvhd;
 113                 uint64_t uniqueID;
 114                 lvhd = (struct logicalVolHeaderDesc *)
 115                                 (lvid->logicalVolContentsUse);
 116                 if (S_ISDIR(mode))
 117                         le32_add_cpu(&lvidiu->numDirs, 1);
 118                 else
 119                         le32_add_cpu(&lvidiu->numFiles, 1);
 120                 iinfo->i_unique = uniqueID = le64_to_cpu(lvhd->uniqueID);
 121                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 122                         uniqueID += 16;
 123                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 124                 udf_updated_lvid(sb);
 125         }
 126         mutex_unlock(&sbi->s_alloc_mutex);
 127         inode->i_mode = mode;
 128         inode->i_uid = current_fsuid();
 129         if (dir->i_mode & S_ISGID) {
 130                 inode->i_gid = dir->i_gid;
 131                 if (S_ISDIR(mode))
 132                         mode |= S_ISGID;
 133         } else {
 134                 inode->i_gid = current_fsgid();
 135         }
 136
 137         iinfo->i_location.logicalBlockNum = block;
 138         iinfo->i_location.partitionReferenceNum =
 139                                 dinfo->i_location.partitionReferenceNum;
 140         inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);
 141         inode->i_blocks = 0;
 142         iinfo->i_lenEAttr = 0;
 143         iinfo->i_lenAlloc = 0;
 144         iinfo->i_use = 0;
 145         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 146                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 147         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 148                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 149         else
 150                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 151         inode->i_mtime = inode->i_atime = inode->i_ctime =
 152                 iinfo->i_crtime = current_fs_time(inode->i_sb);
 153         insert_inode_hash(inode);
 154         mark_inode_dirty(inode);
 155
 156         vfs_dq_init(inode);
 157         ret = dquot_alloc_inode(inode);
 158         if (ret) {
 159                 dquot_drop(inode);
 160                 inode->i_flags |= S_NOQUOTA;
 161                 inode->i_nlink = 0;
 162                 iput(inode);
 163                 *err = ret;
 164                 return NULL;
 165         }
 166
 167         *err = 0;
 168         return inode;
 169 }