Merge branch 'for-linus' of git://linux-nfs.org/~bfields/linux
[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_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 }