fs/udf/ialloc.c

0001 /*
0002  * ialloc.c
0003  *
0004  * PURPOSE
0005  *  Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
0006  *
0007  * COPYRIGHT
0008  *  This file is distributed under the terms of the GNU General Public
0009  *  License (GPL). Copies of the GPL can be obtained from:
0010  *      ftp://prep.ai.mit.edu/pub/gnu/GPL
0011  *  Each contributing author retains all rights to their own work.
0012  *
0013  *  (C) 1998-2001 Ben Fennema
0014  *
0015  * HISTORY
0016  *
0017  *  02/24/99 blf  Created.
0018  *
0019  */
0020
0021 #include "udfdecl.h"
0022 #include <linux/fs.h>
0023 #include <linux/sched.h>
0024 #include <linux/slab.h>
0025
0026 #include "udf_i.h"
0027 #include "udf_sb.h"
0028
0029 void udf_free_inode(struct inode *inode)
0030 {
0031     struct super_block *sb = inode->i_sb;
0032     struct udf_sb_info *sbi = UDF_SB(sb);
0033     struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
0034
0035     if (lvidiu) {
0036         mutex_lock(&sbi->s_alloc_mutex);
0037         if (S_ISDIR(inode->i_mode))
0038             le32_add_cpu(&lvidiu->numDirs, -1);
0039         else
0040             le32_add_cpu(&lvidiu->numFiles, -1);
0041         udf_updated_lvid(sb);
0042         mutex_unlock(&sbi->s_alloc_mutex);
0043     }
0044
0045     udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);
0046 }
0047
0048 struct inode *udf_new_inode(struct inode *dir, umode_t mode)
0049 {
0050     struct super_block *sb = dir->i_sb;
0051     struct udf_sb_info *sbi = UDF_SB(sb);
0052     struct inode *inode;
0053     udf_pblk_t block;
0054     uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
0055     struct udf_inode_info *iinfo;
0056     struct udf_inode_info *dinfo = UDF_I(dir);
0057     struct logicalVolIntegrityDescImpUse *lvidiu;
0058     int err;
0059
0060     inode = new_inode(sb);
0061
0062     if (!inode)
0063         return ERR_PTR(-ENOMEM);
0064
0065     iinfo = UDF_I(inode);
0066     if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
0067         iinfo->i_efe = 1;
0068         if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
0069             sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
0070         iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
0071                     sizeof(struct extendedFileEntry),
0072                     GFP_KERNEL);
0073     } else {
0074         iinfo->i_efe = 0;
0075         iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
0076                     sizeof(struct fileEntry),
0077                     GFP_KERNEL);
0078     }
0079     if (!iinfo->i_data) {
0080         make_bad_inode(inode);
0081         iput(inode);
0082         return ERR_PTR(-ENOMEM);
0083     }
0084
0085     err = -ENOSPC;
0086     block = udf_new_block(dir->i_sb, NULL,
0087                   dinfo->i_location.partitionReferenceNum,
0088                   start, &err);
0089     if (err) {
0090         make_bad_inode(inode);
0091         iput(inode);
0092         return ERR_PTR(err);
0093     }
0094
0095     lvidiu = udf_sb_lvidiu(sb);
0096     if (lvidiu) {
0097         iinfo->i_unique = lvid_get_unique_id(sb);
0098         inode->i_generation = iinfo->i_unique;
0099         mutex_lock(&sbi->s_alloc_mutex);
0100         if (S_ISDIR(mode))
0101             le32_add_cpu(&lvidiu->numDirs, 1);
0102         else
0103             le32_add_cpu(&lvidiu->numFiles, 1);
0104         udf_updated_lvid(sb);
0105         mutex_unlock(&sbi->s_alloc_mutex);
0106     }
0107
0108     inode_init_owner(&init_user_ns, inode, dir, mode);
0109     if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
0110         inode->i_uid = sbi->s_uid;
0111     if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
0112         inode->i_gid = sbi->s_gid;
0113
0114     iinfo->i_location.logicalBlockNum = block;
0115     iinfo->i_location.partitionReferenceNum =
0116                 dinfo->i_location.partitionReferenceNum;
0117     inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);
0118     inode->i_blocks = 0;
0119     iinfo->i_lenEAttr = 0;
0120     iinfo->i_lenAlloc = 0;
0121     iinfo->i_use = 0;
0122     iinfo->i_checkpoint = 1;
0123     iinfo->i_extraPerms = FE_PERM_U_CHATTR;
0124     udf_update_extra_perms(inode, mode);
0125
0126     if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
0127         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
0128     else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
0129         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
0130     else
0131         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
0132     inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
0133     iinfo->i_crtime = inode->i_mtime;
0134     if (unlikely(insert_inode_locked(inode) < 0)) {
0135         make_bad_inode(inode);
0136         iput(inode);
0137         return ERR_PTR(-EIO);
0138     }
0139     mark_inode_dirty(inode);
0140
0141     return inode;
0142 }