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_lvid_bh) {
  47                 struct logicalVolIntegrityDescImpUse *lvidiu =
  48                                                         udf_sb_lvidiu(sbi);
  49                 if (S_ISDIR(inode->i_mode))
  50                         lvidiu->numDirs =
  51                                 cpu_to_le32(le32_to_cpu(lvidiu->numDirs) - 1);
  52                 else
  53                         lvidiu->numFiles =
  54                                 cpu_to_le32(le32_to_cpu(lvidiu->numFiles) - 1);
  55
  56                 mark_buffer_dirty(sbi->s_lvid_bh);
  57         }
  58         mutex_unlock(&sbi->s_alloc_mutex);
  59
  60         udf_free_blocks(sb, NULL, UDF_I(inode)->i_location, 0, 1);
  61 }
  62
  63 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  64 {
  65         struct super_block *sb = dir->i_sb;
  66         struct udf_sb_info *sbi = UDF_SB(sb);
  67         struct inode *inode;
  68         int block;
  69         uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
  70         struct udf_inode_info *iinfo;
  71         struct udf_inode_info *dinfo = UDF_I(dir);
  72
  73         inode = new_inode(sb);
  74
  75         if (!inode) {
  76                 *err = -ENOMEM;
  77                 return NULL;
  78         }
  79         *err = -ENOSPC;
  80
  81         iinfo = UDF_I(inode);
  82         iinfo->i_unique = 0;
  83         iinfo->i_lenExtents = 0;
  84         iinfo->i_next_alloc_block = 0;
  85         iinfo->i_next_alloc_goal = 0;
  86         iinfo->i_strat4096 = 0;
  87
  88         block = udf_new_block(dir->i_sb, NULL,
  89                               dinfo->i_location.partitionReferenceNum,
  90                               start, err);
  91         if (*err) {
  92                 iput(inode);
  93                 return NULL;
  94         }
  95
  96         mutex_lock(&sbi->s_alloc_mutex);
  97         if (sbi->s_lvid_bh) {
  98                 struct logicalVolIntegrityDesc *lvid =
  99                         (struct logicalVolIntegrityDesc *)
 100                         sbi->s_lvid_bh->b_data;
 101                 struct logicalVolIntegrityDescImpUse *lvidiu =
 102                                                         udf_sb_lvidiu(sbi);
 103                 struct logicalVolHeaderDesc *lvhd;
 104                 uint64_t uniqueID;
 105                 lvhd = (struct logicalVolHeaderDesc *)
 106                                 (lvid->logicalVolContentsUse);
 107                 if (S_ISDIR(mode))
 108                         lvidiu->numDirs =
 109                                 cpu_to_le32(le32_to_cpu(lvidiu->numDirs) + 1);
 110                 else
 111                         lvidiu->numFiles =
 112                                 cpu_to_le32(le32_to_cpu(lvidiu->numFiles) + 1);
 113                 iinfo->i_unique = uniqueID = le64_to_cpu(lvhd->uniqueID);
 114                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 115                         uniqueID += 16;
 116                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 117                 mark_buffer_dirty(sbi->s_lvid_bh);
 118         }
 119         inode->i_mode = mode;
 120         inode->i_uid = current->fsuid;
 121         if (dir->i_mode & S_ISGID) {
 122                 inode->i_gid = dir->i_gid;
 123                 if (S_ISDIR(mode))
 124                         mode |= S_ISGID;
 125         } else {
 126                 inode->i_gid = current->fsgid;
 127         }
 128
 129         iinfo->i_location.logicalBlockNum = block;
 130         iinfo->i_location.partitionReferenceNum =
 131                                 dinfo->i_location.partitionReferenceNum;
 132         inode->i_ino = udf_get_lb_pblock(sb, iinfo->i_location, 0);
 133         inode->i_blocks = 0;
 134         iinfo->i_lenEAttr = 0;
 135         iinfo->i_lenAlloc = 0;
 136         iinfo->i_use = 0;
 137         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
 138                 iinfo->i_efe = 1;
 139                 if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
 140                         sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
 141                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 142                                             sizeof(struct extendedFileEntry),
 143                                             GFP_KERNEL);
 144         } else {
 145                 iinfo->i_efe = 0;
 146                 iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 147                                             sizeof(struct fileEntry),
 148                                             GFP_KERNEL);
 149         }
 150         if (!iinfo->i_ext.i_data) {
 151                 iput(inode);
 152                 *err = -ENOMEM;
 153                 mutex_unlock(&sbi->s_alloc_mutex);
 154                 return NULL;
 155         }
 156         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 157                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 158         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 159                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 160         else
 161                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 162         inode->i_mtime = inode->i_atime = inode->i_ctime =
 163                 iinfo->i_crtime = current_fs_time(inode->i_sb);
 164         insert_inode_hash(inode);
 165         mark_inode_dirty(inode);
 166         mutex_unlock(&sbi->s_alloc_mutex);
 167
 168         if (DQUOT_ALLOC_INODE(inode)) {
 169                 DQUOT_DROP(inode);
 170                 inode->i_flags |= S_NOQUOTA;
 171                 inode->i_nlink = 0;
 172                 iput(inode);
 173                 *err = -EDQUOT;
 174                 return NULL;
 175         }
 176
 177         *err = 0;
 178         return inode;
 179 }