xref: /openbmc/linux/fs/udf/ialloc.c (revision c21b37f6)
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 }
162