ext2: add block bitmap validation
[linux-2.6] / 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                 *err = -ENOMEM;
73                 return NULL;
74         }
75         *err = -ENOSPC;
76
77         UDF_I_UNIQUE(inode) = 0;
78         UDF_I_LENEXTENTS(inode) = 0;
79         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
80         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
81         UDF_I_STRAT4096(inode) = 0;
82
83         block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
84                               start, err);
85         if (*err) {
86                 iput(inode);
87                 return NULL;
88         }
89
90         mutex_lock(&sbi->s_alloc_mutex);
91         if (UDF_SB_LVIDBH(sb)) {
92                 struct logicalVolHeaderDesc *lvhd;
93                 uint64_t uniqueID;
94                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
95                 if (S_ISDIR(mode))
96                         UDF_SB_LVIDIU(sb)->numDirs =
97                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
98                 else
99                         UDF_SB_LVIDIU(sb)->numFiles =
100                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
101                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
102                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
103                         uniqueID += 16;
104                 lvhd->uniqueID = cpu_to_le64(uniqueID);
105                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
106         }
107         inode->i_mode = mode;
108         inode->i_uid = current->fsuid;
109         if (dir->i_mode & S_ISGID) {
110                 inode->i_gid = dir->i_gid;
111                 if (S_ISDIR(mode))
112                         mode |= S_ISGID;
113         } else {
114                 inode->i_gid = current->fsgid;
115         }
116
117         UDF_I_LOCATION(inode).logicalBlockNum = block;
118         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
119         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
120         inode->i_blocks = 0;
121         UDF_I_LENEATTR(inode) = 0;
122         UDF_I_LENALLOC(inode) = 0;
123         UDF_I_USE(inode) = 0;
124         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
125                 UDF_I_EFE(inode) = 1;
126                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
127                 UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
128         } else {
129                 UDF_I_EFE(inode) = 0;
130                 UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
131         }
132         if (!UDF_I_DATA(inode)) {
133                 iput(inode);
134                 *err = -ENOMEM;
135                 mutex_unlock(&sbi->s_alloc_mutex);
136                 return NULL;
137         }
138         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
139                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
140         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
141                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
142         else
143                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
144         inode->i_mtime = inode->i_atime = inode->i_ctime =
145                 UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
146         insert_inode_hash(inode);
147         mark_inode_dirty(inode);
148         mutex_unlock(&sbi->s_alloc_mutex);
149
150         if (DQUOT_ALLOC_INODE(inode)) {
151                 DQUOT_DROP(inode);
152                 inode->i_flags |= S_NOQUOTA;
153                 inode->i_nlink = 0;
154                 iput(inode);
155                 *err = -EDQUOT;
156                 return NULL;
157         }
158
159         *err = 0;
160         return inode;
161 }