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
31void 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
61struct 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	{
73		*err = -ENOMEM;
74		return NULL;
75	}
76	*err = -ENOSPC;
77
78	UDF_I_UNIQUE(inode) = 0;
79	UDF_I_LENEXTENTS(inode) = 0;
80	UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
81	UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
82	UDF_I_STRAT4096(inode) = 0;
83
84	block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
85		start, err);
86	if (*err)
87	{
88		iput(inode);
89		return NULL;
90	}
91
92	mutex_lock(&sbi->s_alloc_mutex);
93	if (UDF_SB_LVIDBH(sb))
94	{
95		struct logicalVolHeaderDesc *lvhd;
96		uint64_t uniqueID;
97		lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
98		if (S_ISDIR(mode))
99			UDF_SB_LVIDIU(sb)->numDirs =
100				cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
101		else
102			UDF_SB_LVIDIU(sb)->numFiles =
103				cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
104		UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
105		if (!(++uniqueID & 0x00000000FFFFFFFFUL))
106			uniqueID += 16;
107		lvhd->uniqueID = cpu_to_le64(uniqueID);
108		mark_buffer_dirty(UDF_SB_LVIDBH(sb));
109	}
110	inode->i_mode = mode;
111	inode->i_uid = current->fsuid;
112	if (dir->i_mode & S_ISGID)
113	{
114		inode->i_gid = dir->i_gid;
115		if (S_ISDIR(mode))
116			mode |= S_ISGID;
117	}
118	else
119		inode->i_gid = current->fsgid;
120
121	UDF_I_LOCATION(inode).logicalBlockNum = block;
122	UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
123	inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
124	inode->i_blocks = 0;
125	UDF_I_LENEATTR(inode) = 0;
126	UDF_I_LENALLOC(inode) = 0;
127	UDF_I_USE(inode) = 0;
128	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE))
129	{
130		UDF_I_EFE(inode) = 1;
131		UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
132		UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
133	}
134	else
135	{
136		UDF_I_EFE(inode) = 0;
137		UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
138	}
139	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
140		UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
141	else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
142		UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
143	else
144		UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
145	inode->i_mtime = inode->i_atime = inode->i_ctime =
146		UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
147	insert_inode_hash(inode);
148	mark_inode_dirty(inode);
149	mutex_unlock(&sbi->s_alloc_mutex);
150
151	if (DQUOT_ALLOC_INODE(inode))
152	{
153		DQUOT_DROP(inode);
154		inode->i_flags |= S_NOQUOTA;
155		inode->i_nlink = 0;
156		iput(inode);
157		*err = -EDQUOT;
158		return NULL;
159	}
160
161	*err = 0;
162	return inode;
163}
164