blob: 03fe8bac36cf4ed8fdde1347704e2d0a9b7ebc5a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/minix/inode.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
Gertjan van Wingerdef762dd62009-03-21 23:18:57 +01006 * Copyright (C) 1996 Gertjan van Wingerde
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Minix V2 fs support.
8 *
9 * Modified for 680x0 by Andreas Schwab
Andries Brouwer939b00d2007-02-12 00:52:49 -080010 * Updated to filesystem version 3 by Daniel Aragones
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
13#include <linux/module.h>
14#include "minix.h"
15#include <linux/buffer_head.h>
16#include <linux/slab.h>
17#include <linux/init.h>
18#include <linux/highuid.h>
19#include <linux/vfs.h>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010020#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Christoph Hellwiga9185b42010-03-05 09:21:37 +010022static int minix_write_inode(struct inode *inode,
23 struct writeback_control *wbc);
David Howells726c3342006-06-23 02:02:58 -070024static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025static int minix_remount (struct super_block * sb, int * flags, char * data);
26
Al Viro5ccb4a72010-06-04 22:27:38 -040027static void minix_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028{
Johannes Weiner91b0abe2014-04-03 14:47:49 -070029 truncate_inode_pages_final(&inode->i_data);
Al Viro5ccb4a72010-06-04 22:27:38 -040030 if (!inode->i_nlink) {
31 inode->i_size = 0;
32 minix_truncate(inode);
33 }
34 invalidate_inode_buffers(inode);
Jan Karadbd57682012-05-03 14:48:02 +020035 clear_inode(inode);
Al Viro5ccb4a72010-06-04 22:27:38 -040036 if (!inode->i_nlink)
37 minix_free_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038}
39
40static void minix_put_super(struct super_block *sb)
41{
42 int i;
43 struct minix_sb_info *sbi = minix_sb(sb);
44
David Howellsbc98a422017-07-17 08:45:34 +010045 if (!sb_rdonly(sb)) {
Andries Brouwer939b00d2007-02-12 00:52:49 -080046 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
47 sbi->s_ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 mark_buffer_dirty(sbi->s_sbh);
49 }
50 for (i = 0; i < sbi->s_imap_blocks; i++)
51 brelse(sbi->s_imap[i]);
52 for (i = 0; i < sbi->s_zmap_blocks; i++)
53 brelse(sbi->s_zmap[i]);
54 brelse (sbi->s_sbh);
55 kfree(sbi->s_imap);
56 sb->s_fs_info = NULL;
57 kfree(sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058}
59
Christoph Lametere18b8902006-12-06 20:33:20 -080060static struct kmem_cache * minix_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62static struct inode *minix_alloc_inode(struct super_block *sb)
63{
64 struct minix_inode_info *ei;
Firo Yang83b08bf2015-06-25 15:03:40 -070065 ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (!ei)
67 return NULL;
68 return &ei->vfs_inode;
69}
70
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110071static void minix_i_callback(struct rcu_head *head)
72{
73 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110074 kmem_cache_free(minix_inode_cachep, minix_i(inode));
75}
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077static void minix_destroy_inode(struct inode *inode)
78{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110079 call_rcu(&inode->i_rcu, minix_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070082static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
84 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
85
Christoph Lametera35afb82007-05-16 22:10:57 -070086 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
Paul Mundt20c2df82007-07-20 10:11:58 +090088
Fabian Frederick84ee3532014-04-03 14:50:21 -070089static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
91 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
92 sizeof(struct minix_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -080093 0, (SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -080094 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +090095 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (minix_inode_cachep == NULL)
97 return -ENOMEM;
98 return 0;
99}
100
101static void destroy_inodecache(void)
102{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000103 /*
104 * Make sure all delayed rcu free inodes are flushed before we
105 * destroy cache.
106 */
107 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700108 kmem_cache_destroy(minix_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800111static const struct super_operations minix_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 .alloc_inode = minix_alloc_inode,
113 .destroy_inode = minix_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 .write_inode = minix_write_inode,
Al Viro5ccb4a72010-06-04 22:27:38 -0400115 .evict_inode = minix_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 .put_super = minix_put_super,
117 .statfs = minix_statfs,
118 .remount_fs = minix_remount,
119};
120
121static int minix_remount (struct super_block * sb, int * flags, char * data)
122{
123 struct minix_sb_info * sbi = minix_sb(sb);
124 struct minix_super_block * ms;
125
Theodore Ts'o02b99842014-03-13 10:14:33 -0400126 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 ms = sbi->s_ms;
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800128 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return 0;
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800130 if (*flags & SB_RDONLY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (ms->s_state & MINIX_VALID_FS ||
132 !(sbi->s_mount_state & MINIX_VALID_FS))
133 return 0;
134 /* Mounting a rw partition read-only. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800135 if (sbi->s_version != MINIX_V3)
136 ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 mark_buffer_dirty(sbi->s_sbh);
138 } else {
139 /* Mount a partition which is read-only, read-write. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800140 if (sbi->s_version != MINIX_V3) {
141 sbi->s_mount_state = ms->s_state;
142 ms->s_state &= ~MINIX_VALID_FS;
143 } else {
144 sbi->s_mount_state = MINIX_VALID_FS;
145 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 mark_buffer_dirty(sbi->s_sbh);
147
148 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800149 printk("MINIX-fs warning: remounting unchecked fs, "
150 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800152 printk("MINIX-fs warning: remounting fs with errors, "
153 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
155 return 0;
156}
157
Eric Biggers95fc8412020-08-11 18:35:33 -0700158static bool minix_check_superblock(struct super_block *sb)
Eric Biggers954fc7d2020-08-11 18:35:30 -0700159{
Eric Biggers95fc8412020-08-11 18:35:33 -0700160 struct minix_sb_info *sbi = minix_sb(sb);
161
Eric Biggers954fc7d2020-08-11 18:35:30 -0700162 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
163 return false;
164
165 /*
166 * s_max_size must not exceed the block mapping limitation. This check
167 * is only needed for V1 filesystems, since V2/V3 support an extra level
168 * of indirect blocks which places the limit well above U32_MAX.
169 */
170 if (sbi->s_version == MINIX_V1 &&
Eric Biggers95fc8412020-08-11 18:35:33 -0700171 sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE)
Eric Biggers954fc7d2020-08-11 18:35:30 -0700172 return false;
173
174 return true;
175}
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177static int minix_fill_super(struct super_block *s, void *data, int silent)
178{
179 struct buffer_head *bh;
180 struct buffer_head **map;
181 struct minix_super_block *ms;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800182 struct minix3_super_block *m3s = NULL;
183 unsigned long i, block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 struct inode *root_inode;
185 struct minix_sb_info *sbi;
David Howellsa90a08802008-02-07 00:15:44 -0800186 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700188 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 if (!sbi)
190 return -ENOMEM;
191 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700193 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
194 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 if (!sb_set_blocksize(s, BLOCK_SIZE))
197 goto out_bad_hblock;
198
199 if (!(bh = sb_bread(s, 1)))
200 goto out_bad_sb;
201
202 ms = (struct minix_super_block *) bh->b_data;
203 sbi->s_ms = ms;
204 sbi->s_sbh = bh;
205 sbi->s_mount_state = ms->s_state;
206 sbi->s_ninodes = ms->s_ninodes;
207 sbi->s_nzones = ms->s_nzones;
208 sbi->s_imap_blocks = ms->s_imap_blocks;
209 sbi->s_zmap_blocks = ms->s_zmap_blocks;
210 sbi->s_firstdatazone = ms->s_firstdatazone;
211 sbi->s_log_zone_size = ms->s_log_zone_size;
Eric Biggers95fc8412020-08-11 18:35:33 -0700212 s->s_maxbytes = ms->s_max_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 s->s_magic = ms->s_magic;
214 if (s->s_magic == MINIX_SUPER_MAGIC) {
215 sbi->s_version = MINIX_V1;
216 sbi->s_dirsize = 16;
217 sbi->s_namelen = 14;
Al Viro8de52772012-02-06 12:45:27 -0500218 s->s_max_links = MINIX_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
220 sbi->s_version = MINIX_V1;
221 sbi->s_dirsize = 32;
222 sbi->s_namelen = 30;
Al Viro8de52772012-02-06 12:45:27 -0500223 s->s_max_links = MINIX_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
225 sbi->s_version = MINIX_V2;
226 sbi->s_nzones = ms->s_zones;
227 sbi->s_dirsize = 16;
228 sbi->s_namelen = 14;
Al Viro8de52772012-02-06 12:45:27 -0500229 s->s_max_links = MINIX2_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
231 sbi->s_version = MINIX_V2;
232 sbi->s_nzones = ms->s_zones;
233 sbi->s_dirsize = 32;
234 sbi->s_namelen = 30;
Al Viro8de52772012-02-06 12:45:27 -0500235 s->s_max_links = MINIX2_LINK_MAX;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800236 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
237 m3s = (struct minix3_super_block *) bh->b_data;
238 s->s_magic = m3s->s_magic;
239 sbi->s_imap_blocks = m3s->s_imap_blocks;
240 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
241 sbi->s_firstdatazone = m3s->s_firstdatazone;
242 sbi->s_log_zone_size = m3s->s_log_zone_size;
Eric Biggers95fc8412020-08-11 18:35:33 -0700243 s->s_maxbytes = m3s->s_max_size;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800244 sbi->s_ninodes = m3s->s_ninodes;
245 sbi->s_nzones = m3s->s_zones;
246 sbi->s_dirsize = 64;
247 sbi->s_namelen = 60;
248 sbi->s_version = MINIX_V3;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800249 sbi->s_mount_state = MINIX_VALID_FS;
250 sb_set_blocksize(s, m3s->s_blocksize);
Al Viro8de52772012-02-06 12:45:27 -0500251 s->s_max_links = MINIX2_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 } else
253 goto out_no_fs;
254
Eric Biggers95fc8412020-08-11 18:35:33 -0700255 if (!minix_check_superblock(s))
Eric Biggers954fc7d2020-08-11 18:35:30 -0700256 goto out_illegal_sb;
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 /*
259 * Allocate the buffer map to keep the superblock small.
260 */
261 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700262 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 if (!map)
264 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 sbi->s_imap = &map[0];
266 sbi->s_zmap = &map[sbi->s_imap_blocks];
267
268 block=2;
269 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
270 if (!(sbi->s_imap[i]=sb_bread(s, block)))
271 goto out_no_bitmap;
272 block++;
273 }
274 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
275 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
276 goto out_no_bitmap;
277 block++;
278 }
279
280 minix_set_bit(0,sbi->s_imap[0]->b_data);
281 minix_set_bit(0,sbi->s_zmap[0]->b_data);
282
Josh Boyer016e8d42011-08-19 14:50:26 -0400283 /* Apparently minix can create filesystems that allocate more blocks for
284 * the bitmaps than needed. We simply ignore that, but verify it didn't
285 * create one with not enough blocks and bail out if so.
286 */
287 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
288 if (sbi->s_imap_blocks < block) {
289 printk("MINIX-fs: file system does not have enough "
Qi Yong6d6747f2014-08-08 14:20:29 -0700290 "imap blocks allocated. Refusing to mount.\n");
Al Viroca85c072012-02-12 22:07:43 -0500291 goto out_no_bitmap;
Josh Boyer016e8d42011-08-19 14:50:26 -0400292 }
293
294 block = minix_blocks_needed(
Qi Yong6d6747f2014-08-08 14:20:29 -0700295 (sbi->s_nzones - sbi->s_firstdatazone + 1),
Josh Boyer016e8d42011-08-19 14:50:26 -0400296 s->s_blocksize);
297 if (sbi->s_zmap_blocks < block) {
298 printk("MINIX-fs: file system does not have enough "
299 "zmap blocks allocated. Refusing to mount.\n");
Al Viroca85c072012-02-12 22:07:43 -0500300 goto out_no_bitmap;
301 }
302
303 /* set up enough so that it can read an inode */
304 s->s_op = &minix_sops;
305 root_inode = minix_iget(s, MINIX_ROOT_INO);
306 if (IS_ERR(root_inode)) {
307 ret = PTR_ERR(root_inode);
308 goto out_no_root;
Josh Boyer016e8d42011-08-19 14:50:26 -0400309 }
310
Al Virod6042ea2012-01-04 10:51:03 +0000311 ret = -ENOMEM;
Al Viroca85c072012-02-12 22:07:43 -0500312 s->s_root = d_make_root(root_inode);
Al Virod6042ea2012-01-04 10:51:03 +0000313 if (!s->s_root)
Al Viroca85c072012-02-12 22:07:43 -0500314 goto out_no_root;
Al Virod6042ea2012-01-04 10:51:03 +0000315
David Howellsbc98a422017-07-17 08:45:34 +0100316 if (!sb_rdonly(s)) {
Al Virod6042ea2012-01-04 10:51:03 +0000317 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
318 ms->s_state &= ~MINIX_VALID_FS;
319 mark_buffer_dirty(bh);
320 }
321 if (!(sbi->s_mount_state & MINIX_VALID_FS))
322 printk("MINIX-fs: mounting unchecked file system, "
323 "running fsck is recommended\n");
324 else if (sbi->s_mount_state & MINIX_ERROR_FS)
325 printk("MINIX-fs: mounting file system with errors, "
326 "running fsck is recommended\n");
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 return 0;
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330out_no_root:
331 if (!silent)
332 printk("MINIX-fs: get root inode failed\n");
333 goto out_freemap;
334
335out_no_bitmap:
336 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700337out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 for (i = 0; i < sbi->s_imap_blocks; i++)
339 brelse(sbi->s_imap[i]);
340 for (i = 0; i < sbi->s_zmap_blocks; i++)
341 brelse(sbi->s_zmap[i]);
342 kfree(sbi->s_imap);
343 goto out_release;
344
345out_no_map:
David Howellsa90a08802008-02-07 00:15:44 -0800346 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800348 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 goto out_release;
350
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700351out_illegal_sb:
352 if (!silent)
353 printk("MINIX-fs: bad superblock\n");
354 goto out_release;
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356out_no_fs:
357 if (!silent)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800358 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
359 "on device %s.\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700360out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 brelse(bh);
362 goto out;
363
364out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800365 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 goto out;
367
368out_bad_sb:
369 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700370out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 s->s_fs_info = NULL;
372 kfree(sbi);
David Howellsa90a08802008-02-07 00:15:44 -0800373 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
375
David Howells726c3342006-06-23 02:02:58 -0700376static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
Coly Li054475d2009-04-02 16:59:39 -0700378 struct super_block *sb = dentry->d_sb;
379 struct minix_sb_info *sbi = minix_sb(sb);
380 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
381 buf->f_type = sb->s_magic;
382 buf->f_bsize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
Josh Boyer016e8d42011-08-19 14:50:26 -0400384 buf->f_bfree = minix_count_free_blocks(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 buf->f_bavail = buf->f_bfree;
386 buf->f_files = sbi->s_ninodes;
Josh Boyer016e8d42011-08-19 14:50:26 -0400387 buf->f_ffree = minix_count_free_inodes(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 buf->f_namelen = sbi->s_namelen;
Coly Li054475d2009-04-02 16:59:39 -0700389 buf->f_fsid.val[0] = (u32)id;
390 buf->f_fsid.val[1] = (u32)(id >> 32);
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return 0;
393}
394
395static int minix_get_block(struct inode *inode, sector_t block,
396 struct buffer_head *bh_result, int create)
397{
398 if (INODE_VERSION(inode) == MINIX_V1)
399 return V1_minix_get_block(inode, block, bh_result, create);
400 else
401 return V2_minix_get_block(inode, block, bh_result, create);
402}
403
404static int minix_writepage(struct page *page, struct writeback_control *wbc)
405{
406 return block_write_full_page(page, minix_get_block, wbc);
407}
Nick Piggin4a66af92007-10-16 01:25:21 -0700408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409static int minix_readpage(struct file *file, struct page *page)
410{
411 return block_read_full_page(page,minix_get_block);
412}
Nick Piggin4a66af92007-10-16 01:25:21 -0700413
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200414int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
Christoph Hellwig6e1db882010-06-04 11:29:57 +0200416 return __block_write_begin(page, pos, len, minix_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417}
Nick Piggin4a66af92007-10-16 01:25:21 -0700418
Marco Stornelli7fc7cd02012-12-15 11:56:25 +0100419static void minix_write_failed(struct address_space *mapping, loff_t to)
420{
421 struct inode *inode = mapping->host;
422
423 if (to > inode->i_size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700424 truncate_pagecache(inode, inode->i_size);
Marco Stornelli7fc7cd02012-12-15 11:56:25 +0100425 minix_truncate(inode);
426 }
427}
428
Nick Piggin4a66af92007-10-16 01:25:21 -0700429static int minix_write_begin(struct file *file, struct address_space *mapping,
430 loff_t pos, unsigned len, unsigned flags,
431 struct page **pagep, void **fsdata)
432{
Christoph Hellwig155130a2010-06-04 11:29:58 +0200433 int ret;
434
435 ret = block_write_begin(mapping, pos, len, flags, pagep,
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200436 minix_get_block);
Marco Stornelli7fc7cd02012-12-15 11:56:25 +0100437 if (unlikely(ret))
438 minix_write_failed(mapping, pos + len);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200439
440 return ret;
Nick Piggin4a66af92007-10-16 01:25:21 -0700441}
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443static sector_t minix_bmap(struct address_space *mapping, sector_t block)
444{
445 return generic_block_bmap(mapping,block,minix_get_block);
446}
Nick Piggin4a66af92007-10-16 01:25:21 -0700447
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700448static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 .readpage = minix_readpage,
450 .writepage = minix_writepage,
Nick Piggin4a66af92007-10-16 01:25:21 -0700451 .write_begin = minix_write_begin,
452 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 .bmap = minix_bmap
454};
455
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800456static const struct inode_operations minix_symlink_inode_operations = {
Al Viro6b255392015-11-17 10:20:54 -0500457 .get_link = page_get_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 .getattr = minix_getattr,
459};
460
461void minix_set_inode(struct inode *inode, dev_t rdev)
462{
463 if (S_ISREG(inode->i_mode)) {
464 inode->i_op = &minix_file_inode_operations;
465 inode->i_fop = &minix_file_operations;
466 inode->i_mapping->a_ops = &minix_aops;
467 } else if (S_ISDIR(inode->i_mode)) {
468 inode->i_op = &minix_dir_inode_operations;
469 inode->i_fop = &minix_dir_operations;
470 inode->i_mapping->a_ops = &minix_aops;
471 } else if (S_ISLNK(inode->i_mode)) {
472 inode->i_op = &minix_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -0500473 inode_nohighmem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 inode->i_mapping->a_ops = &minix_aops;
475 } else
476 init_special_inode(inode, inode->i_mode, rdev);
477}
478
479/*
480 * The minix V1 function to read an inode.
481 */
David Howellsa90a08802008-02-07 00:15:44 -0800482static struct inode *V1_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483{
484 struct buffer_head * bh;
485 struct minix_inode * raw_inode;
486 struct minix_inode_info *minix_inode = minix_i(inode);
487 int i;
488
489 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
490 if (!raw_inode) {
David Howellsa90a08802008-02-07 00:15:44 -0800491 iget_failed(inode);
492 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 }
Eric Biggers169f7f32020-08-11 18:35:27 -0700494 if (raw_inode->i_nlinks == 0) {
495 printk("MINIX-fs: deleted inode referenced: %lu\n",
496 inode->i_ino);
497 brelse(bh);
498 iget_failed(inode);
499 return ERR_PTR(-ESTALE);
500 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 inode->i_mode = raw_inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800502 i_uid_write(inode, raw_inode->i_uid);
503 i_gid_write(inode, raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200504 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 inode->i_size = raw_inode->i_size;
506 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
507 inode->i_mtime.tv_nsec = 0;
508 inode->i_atime.tv_nsec = 0;
509 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700510 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 for (i = 0; i < 9; i++)
512 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
513 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
514 brelse(bh);
David Howellsa90a08802008-02-07 00:15:44 -0800515 unlock_new_inode(inode);
516 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
519/*
520 * The minix V2 function to read an inode.
521 */
David Howellsa90a08802008-02-07 00:15:44 -0800522static struct inode *V2_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
524 struct buffer_head * bh;
525 struct minix2_inode * raw_inode;
526 struct minix_inode_info *minix_inode = minix_i(inode);
527 int i;
528
529 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
530 if (!raw_inode) {
David Howellsa90a08802008-02-07 00:15:44 -0800531 iget_failed(inode);
532 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 }
Eric Biggers169f7f32020-08-11 18:35:27 -0700534 if (raw_inode->i_nlinks == 0) {
535 printk("MINIX-fs: deleted inode referenced: %lu\n",
536 inode->i_ino);
537 brelse(bh);
538 iget_failed(inode);
539 return ERR_PTR(-ESTALE);
540 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 inode->i_mode = raw_inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800542 i_uid_write(inode, raw_inode->i_uid);
543 i_gid_write(inode, raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200544 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 inode->i_size = raw_inode->i_size;
546 inode->i_mtime.tv_sec = raw_inode->i_mtime;
547 inode->i_atime.tv_sec = raw_inode->i_atime;
548 inode->i_ctime.tv_sec = raw_inode->i_ctime;
549 inode->i_mtime.tv_nsec = 0;
550 inode->i_atime.tv_nsec = 0;
551 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700552 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 for (i = 0; i < 10; i++)
554 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
555 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
556 brelse(bh);
David Howellsa90a08802008-02-07 00:15:44 -0800557 unlock_new_inode(inode);
558 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559}
560
561/*
562 * The global function to read an inode.
563 */
David Howellsa90a08802008-02-07 00:15:44 -0800564struct inode *minix_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
David Howellsa90a08802008-02-07 00:15:44 -0800566 struct inode *inode;
567
568 inode = iget_locked(sb, ino);
569 if (!inode)
570 return ERR_PTR(-ENOMEM);
571 if (!(inode->i_state & I_NEW))
572 return inode;
573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 if (INODE_VERSION(inode) == MINIX_V1)
David Howellsa90a08802008-02-07 00:15:44 -0800575 return V1_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 else
David Howellsa90a08802008-02-07 00:15:44 -0800577 return V2_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
580/*
581 * The minix V1 function to synchronize an inode.
582 */
583static struct buffer_head * V1_minix_update_inode(struct inode * inode)
584{
585 struct buffer_head * bh;
586 struct minix_inode * raw_inode;
587 struct minix_inode_info *minix_inode = minix_i(inode);
588 int i;
589
590 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
591 if (!raw_inode)
592 return NULL;
593 raw_inode->i_mode = inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800594 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
595 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 raw_inode->i_nlinks = inode->i_nlink;
597 raw_inode->i_size = inode->i_size;
598 raw_inode->i_time = inode->i_mtime.tv_sec;
599 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
600 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
601 else for (i = 0; i < 9; i++)
602 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
603 mark_buffer_dirty(bh);
604 return bh;
605}
606
607/*
608 * The minix V2 function to synchronize an inode.
609 */
610static struct buffer_head * V2_minix_update_inode(struct inode * inode)
611{
612 struct buffer_head * bh;
613 struct minix2_inode * raw_inode;
614 struct minix_inode_info *minix_inode = minix_i(inode);
615 int i;
616
617 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
618 if (!raw_inode)
619 return NULL;
620 raw_inode->i_mode = inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800621 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
622 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 raw_inode->i_nlinks = inode->i_nlink;
624 raw_inode->i_size = inode->i_size;
625 raw_inode->i_mtime = inode->i_mtime.tv_sec;
626 raw_inode->i_atime = inode->i_atime.tv_sec;
627 raw_inode->i_ctime = inode->i_ctime.tv_sec;
628 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
629 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
630 else for (i = 0; i < 10; i++)
631 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
632 mark_buffer_dirty(bh);
633 return bh;
634}
635
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100636static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637{
638 int err = 0;
639 struct buffer_head *bh;
640
Al Viro0d7916d2009-06-07 15:21:06 -0400641 if (INODE_VERSION(inode) == MINIX_V1)
642 bh = V1_minix_update_inode(inode);
643 else
644 bh = V2_minix_update_inode(inode);
645 if (!bh)
646 return -EIO;
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100647 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 sync_dirty_buffer(bh);
Al Viro0d7916d2009-06-07 15:21:06 -0400649 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800650 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 inode->i_sb->s_id, inode->i_ino);
Al Viro0d7916d2009-06-07 15:21:06 -0400652 err = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 }
654 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 brelse (bh);
656 return err;
657}
658
David Howellsa528d352017-01-31 16:46:22 +0000659int minix_getattr(const struct path *path, struct kstat *stat,
660 u32 request_mask, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661{
David Howellsa528d352017-01-31 16:46:22 +0000662 struct super_block *sb = path->dentry->d_sb;
663 struct inode *inode = d_inode(path->dentry);
664
665 generic_fillattr(inode, stat);
666 if (INODE_VERSION(inode) == MINIX_V1)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800667 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 else
Andries Brouwer939b00d2007-02-12 00:52:49 -0800669 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
670 stat->blksize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 return 0;
672}
673
674/*
675 * The function that is called for file truncation.
676 */
677void minix_truncate(struct inode * inode)
678{
679 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
680 return;
681 if (INODE_VERSION(inode) == MINIX_V1)
682 V1_minix_truncate(inode);
683 else
684 V2_minix_truncate(inode);
685}
686
Al Viro152a0832010-07-25 00:46:55 +0400687static struct dentry *minix_mount(struct file_system_type *fs_type,
688 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
Al Viro152a0832010-07-25 00:46:55 +0400690 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691}
692
693static struct file_system_type minix_fs_type = {
694 .owner = THIS_MODULE,
695 .name = "minix",
Al Viro152a0832010-07-25 00:46:55 +0400696 .mount = minix_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 .kill_sb = kill_block_super,
698 .fs_flags = FS_REQUIRES_DEV,
699};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800700MODULE_ALIAS_FS("minix");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702static int __init init_minix_fs(void)
703{
704 int err = init_inodecache();
705 if (err)
706 goto out1;
707 err = register_filesystem(&minix_fs_type);
708 if (err)
709 goto out;
710 return 0;
711out:
712 destroy_inodecache();
713out1:
714 return err;
715}
716
717static void __exit exit_minix_fs(void)
718{
719 unregister_filesystem(&minix_fs_type);
720 destroy_inodecache();
721}
722
723module_init(init_minix_fs)
724module_exit(exit_minix_fs)
725MODULE_LICENSE("GPL");
726