blob: 7cb5fd38eb149ffebd76aa68e61990cbf52820c8 [file] [log] [blame]
Thomas Gleixner09c434b2019-05-19 13:08:20 +01001// SPDX-License-Identifier: GPL-2.0-only
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * linux/fs/minix/inode.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
Gertjan van Wingerdef762dd62009-03-21 23:18:57 +01007 * Copyright (C) 1996 Gertjan van Wingerde
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Minix V2 fs support.
9 *
10 * Modified for 680x0 by Andreas Schwab
Andries Brouwer939b00d2007-02-12 00:52:49 -080011 * Updated to filesystem version 3 by Daniel Aragones
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 */
13
14#include <linux/module.h>
15#include "minix.h"
16#include <linux/buffer_head.h>
17#include <linux/slab.h>
18#include <linux/init.h>
19#include <linux/highuid.h>
20#include <linux/vfs.h>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010021#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Christoph Hellwiga9185b42010-03-05 09:21:37 +010023static int minix_write_inode(struct inode *inode,
24 struct writeback_control *wbc);
David Howells726c3342006-06-23 02:02:58 -070025static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070026static int minix_remount (struct super_block * sb, int * flags, char * data);
27
Al Viro5ccb4a72010-06-04 22:27:38 -040028static void minix_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
Johannes Weiner91b0abe2014-04-03 14:47:49 -070030 truncate_inode_pages_final(&inode->i_data);
Al Viro5ccb4a72010-06-04 22:27:38 -040031 if (!inode->i_nlink) {
32 inode->i_size = 0;
33 minix_truncate(inode);
34 }
35 invalidate_inode_buffers(inode);
Jan Karadbd57682012-05-03 14:48:02 +020036 clear_inode(inode);
Al Viro5ccb4a72010-06-04 22:27:38 -040037 if (!inode->i_nlink)
38 minix_free_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039}
40
41static void minix_put_super(struct super_block *sb)
42{
43 int i;
44 struct minix_sb_info *sbi = minix_sb(sb);
45
David Howellsbc98a422017-07-17 08:45:34 +010046 if (!sb_rdonly(sb)) {
Andries Brouwer939b00d2007-02-12 00:52:49 -080047 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
48 sbi->s_ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 mark_buffer_dirty(sbi->s_sbh);
50 }
51 for (i = 0; i < sbi->s_imap_blocks; i++)
52 brelse(sbi->s_imap[i]);
53 for (i = 0; i < sbi->s_zmap_blocks; i++)
54 brelse(sbi->s_zmap[i]);
55 brelse (sbi->s_sbh);
56 kfree(sbi->s_imap);
57 sb->s_fs_info = NULL;
58 kfree(sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059}
60
Christoph Lametere18b8902006-12-06 20:33:20 -080061static struct kmem_cache * minix_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63static struct inode *minix_alloc_inode(struct super_block *sb)
64{
65 struct minix_inode_info *ei;
Firo Yang83b08bf2015-06-25 15:03:40 -070066 ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 if (!ei)
68 return NULL;
69 return &ei->vfs_inode;
70}
71
Al Virod67a3982019-04-15 20:16:57 -040072static void minix_free_in_core_inode(struct inode *inode)
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110073{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110074 kmem_cache_free(minix_inode_cachep, minix_i(inode));
75}
76
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070077static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
79 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
80
Christoph Lametera35afb82007-05-16 22:10:57 -070081 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082}
Paul Mundt20c2df82007-07-20 10:11:58 +090083
Fabian Frederick84ee3532014-04-03 14:50:21 -070084static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
86 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
87 sizeof(struct minix_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -080088 0, (SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -080089 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +090090 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 if (minix_inode_cachep == NULL)
92 return -ENOMEM;
93 return 0;
94}
95
96static void destroy_inodecache(void)
97{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +100098 /*
99 * Make sure all delayed rcu free inodes are flushed before we
100 * destroy cache.
101 */
102 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700103 kmem_cache_destroy(minix_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800106static const struct super_operations minix_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 .alloc_inode = minix_alloc_inode,
Al Virod67a3982019-04-15 20:16:57 -0400108 .free_inode = minix_free_in_core_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 .write_inode = minix_write_inode,
Al Viro5ccb4a72010-06-04 22:27:38 -0400110 .evict_inode = minix_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 .put_super = minix_put_super,
112 .statfs = minix_statfs,
113 .remount_fs = minix_remount,
114};
115
116static int minix_remount (struct super_block * sb, int * flags, char * data)
117{
118 struct minix_sb_info * sbi = minix_sb(sb);
119 struct minix_super_block * ms;
120
Theodore Ts'o02b99842014-03-13 10:14:33 -0400121 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 ms = sbi->s_ms;
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800123 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return 0;
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800125 if (*flags & SB_RDONLY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 if (ms->s_state & MINIX_VALID_FS ||
127 !(sbi->s_mount_state & MINIX_VALID_FS))
128 return 0;
129 /* Mounting a rw partition read-only. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800130 if (sbi->s_version != MINIX_V3)
131 ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 mark_buffer_dirty(sbi->s_sbh);
133 } else {
134 /* Mount a partition which is read-only, read-write. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800135 if (sbi->s_version != MINIX_V3) {
136 sbi->s_mount_state = ms->s_state;
137 ms->s_state &= ~MINIX_VALID_FS;
138 } else {
139 sbi->s_mount_state = MINIX_VALID_FS;
140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 mark_buffer_dirty(sbi->s_sbh);
142
143 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800144 printk("MINIX-fs warning: remounting unchecked fs, "
145 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800147 printk("MINIX-fs warning: remounting fs with errors, "
148 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
150 return 0;
151}
152
153static int minix_fill_super(struct super_block *s, void *data, int silent)
154{
155 struct buffer_head *bh;
156 struct buffer_head **map;
157 struct minix_super_block *ms;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800158 struct minix3_super_block *m3s = NULL;
159 unsigned long i, block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 struct inode *root_inode;
161 struct minix_sb_info *sbi;
David Howellsa90a08802008-02-07 00:15:44 -0800162 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700164 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (!sbi)
166 return -ENOMEM;
167 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700169 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
170 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 if (!sb_set_blocksize(s, BLOCK_SIZE))
173 goto out_bad_hblock;
174
175 if (!(bh = sb_bread(s, 1)))
176 goto out_bad_sb;
177
178 ms = (struct minix_super_block *) bh->b_data;
179 sbi->s_ms = ms;
180 sbi->s_sbh = bh;
181 sbi->s_mount_state = ms->s_state;
182 sbi->s_ninodes = ms->s_ninodes;
183 sbi->s_nzones = ms->s_nzones;
184 sbi->s_imap_blocks = ms->s_imap_blocks;
185 sbi->s_zmap_blocks = ms->s_zmap_blocks;
186 sbi->s_firstdatazone = ms->s_firstdatazone;
187 sbi->s_log_zone_size = ms->s_log_zone_size;
188 sbi->s_max_size = ms->s_max_size;
189 s->s_magic = ms->s_magic;
190 if (s->s_magic == MINIX_SUPER_MAGIC) {
191 sbi->s_version = MINIX_V1;
192 sbi->s_dirsize = 16;
193 sbi->s_namelen = 14;
Al Viro8de52772012-02-06 12:45:27 -0500194 s->s_max_links = MINIX_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
196 sbi->s_version = MINIX_V1;
197 sbi->s_dirsize = 32;
198 sbi->s_namelen = 30;
Al Viro8de52772012-02-06 12:45:27 -0500199 s->s_max_links = MINIX_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
201 sbi->s_version = MINIX_V2;
202 sbi->s_nzones = ms->s_zones;
203 sbi->s_dirsize = 16;
204 sbi->s_namelen = 14;
Al Viro8de52772012-02-06 12:45:27 -0500205 s->s_max_links = MINIX2_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
207 sbi->s_version = MINIX_V2;
208 sbi->s_nzones = ms->s_zones;
209 sbi->s_dirsize = 32;
210 sbi->s_namelen = 30;
Al Viro8de52772012-02-06 12:45:27 -0500211 s->s_max_links = MINIX2_LINK_MAX;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800212 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
213 m3s = (struct minix3_super_block *) bh->b_data;
214 s->s_magic = m3s->s_magic;
215 sbi->s_imap_blocks = m3s->s_imap_blocks;
216 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
217 sbi->s_firstdatazone = m3s->s_firstdatazone;
218 sbi->s_log_zone_size = m3s->s_log_zone_size;
219 sbi->s_max_size = m3s->s_max_size;
220 sbi->s_ninodes = m3s->s_ninodes;
221 sbi->s_nzones = m3s->s_zones;
222 sbi->s_dirsize = 64;
223 sbi->s_namelen = 60;
224 sbi->s_version = MINIX_V3;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800225 sbi->s_mount_state = MINIX_VALID_FS;
226 sb_set_blocksize(s, m3s->s_blocksize);
Al Viro8de52772012-02-06 12:45:27 -0500227 s->s_max_links = MINIX2_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 } else
229 goto out_no_fs;
230
231 /*
232 * Allocate the buffer map to keep the superblock small.
233 */
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700234 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
235 goto out_illegal_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700237 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (!map)
239 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 sbi->s_imap = &map[0];
241 sbi->s_zmap = &map[sbi->s_imap_blocks];
242
243 block=2;
244 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
245 if (!(sbi->s_imap[i]=sb_bread(s, block)))
246 goto out_no_bitmap;
247 block++;
248 }
249 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
250 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
251 goto out_no_bitmap;
252 block++;
253 }
254
255 minix_set_bit(0,sbi->s_imap[0]->b_data);
256 minix_set_bit(0,sbi->s_zmap[0]->b_data);
257
Josh Boyer016e8d42011-08-19 14:50:26 -0400258 /* Apparently minix can create filesystems that allocate more blocks for
259 * the bitmaps than needed. We simply ignore that, but verify it didn't
260 * create one with not enough blocks and bail out if so.
261 */
262 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
263 if (sbi->s_imap_blocks < block) {
264 printk("MINIX-fs: file system does not have enough "
Qi Yong6d6747f2014-08-08 14:20:29 -0700265 "imap blocks allocated. Refusing to mount.\n");
Al Viroca85c072012-02-12 22:07:43 -0500266 goto out_no_bitmap;
Josh Boyer016e8d42011-08-19 14:50:26 -0400267 }
268
269 block = minix_blocks_needed(
Qi Yong6d6747f2014-08-08 14:20:29 -0700270 (sbi->s_nzones - sbi->s_firstdatazone + 1),
Josh Boyer016e8d42011-08-19 14:50:26 -0400271 s->s_blocksize);
272 if (sbi->s_zmap_blocks < block) {
273 printk("MINIX-fs: file system does not have enough "
274 "zmap blocks allocated. Refusing to mount.\n");
Al Viroca85c072012-02-12 22:07:43 -0500275 goto out_no_bitmap;
276 }
277
278 /* set up enough so that it can read an inode */
279 s->s_op = &minix_sops;
Deepa Dinamani22b13962019-07-30 08:22:29 -0700280 s->s_time_min = 0;
281 s->s_time_max = U32_MAX;
Al Viroca85c072012-02-12 22:07:43 -0500282 root_inode = minix_iget(s, MINIX_ROOT_INO);
283 if (IS_ERR(root_inode)) {
284 ret = PTR_ERR(root_inode);
285 goto out_no_root;
Josh Boyer016e8d42011-08-19 14:50:26 -0400286 }
287
Al Virod6042ea2012-01-04 10:51:03 +0000288 ret = -ENOMEM;
Al Viroca85c072012-02-12 22:07:43 -0500289 s->s_root = d_make_root(root_inode);
Al Virod6042ea2012-01-04 10:51:03 +0000290 if (!s->s_root)
Al Viroca85c072012-02-12 22:07:43 -0500291 goto out_no_root;
Al Virod6042ea2012-01-04 10:51:03 +0000292
David Howellsbc98a422017-07-17 08:45:34 +0100293 if (!sb_rdonly(s)) {
Al Virod6042ea2012-01-04 10:51:03 +0000294 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
295 ms->s_state &= ~MINIX_VALID_FS;
296 mark_buffer_dirty(bh);
297 }
298 if (!(sbi->s_mount_state & MINIX_VALID_FS))
299 printk("MINIX-fs: mounting unchecked file system, "
300 "running fsck is recommended\n");
301 else if (sbi->s_mount_state & MINIX_ERROR_FS)
302 printk("MINIX-fs: mounting file system with errors, "
303 "running fsck is recommended\n");
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 return 0;
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307out_no_root:
308 if (!silent)
309 printk("MINIX-fs: get root inode failed\n");
310 goto out_freemap;
311
312out_no_bitmap:
313 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700314out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 for (i = 0; i < sbi->s_imap_blocks; i++)
316 brelse(sbi->s_imap[i]);
317 for (i = 0; i < sbi->s_zmap_blocks; i++)
318 brelse(sbi->s_zmap[i]);
319 kfree(sbi->s_imap);
320 goto out_release;
321
322out_no_map:
David Howellsa90a08802008-02-07 00:15:44 -0800323 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800325 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 goto out_release;
327
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700328out_illegal_sb:
329 if (!silent)
330 printk("MINIX-fs: bad superblock\n");
331 goto out_release;
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333out_no_fs:
334 if (!silent)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800335 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
336 "on device %s.\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700337out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 brelse(bh);
339 goto out;
340
341out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800342 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 goto out;
344
345out_bad_sb:
346 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700347out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 s->s_fs_info = NULL;
349 kfree(sbi);
David Howellsa90a08802008-02-07 00:15:44 -0800350 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
David Howells726c3342006-06-23 02:02:58 -0700353static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
Coly Li054475d2009-04-02 16:59:39 -0700355 struct super_block *sb = dentry->d_sb;
356 struct minix_sb_info *sbi = minix_sb(sb);
357 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
358 buf->f_type = sb->s_magic;
359 buf->f_bsize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
Josh Boyer016e8d42011-08-19 14:50:26 -0400361 buf->f_bfree = minix_count_free_blocks(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 buf->f_bavail = buf->f_bfree;
363 buf->f_files = sbi->s_ninodes;
Josh Boyer016e8d42011-08-19 14:50:26 -0400364 buf->f_ffree = minix_count_free_inodes(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 buf->f_namelen = sbi->s_namelen;
Coly Li054475d2009-04-02 16:59:39 -0700366 buf->f_fsid.val[0] = (u32)id;
367 buf->f_fsid.val[1] = (u32)(id >> 32);
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return 0;
370}
371
372static int minix_get_block(struct inode *inode, sector_t block,
373 struct buffer_head *bh_result, int create)
374{
375 if (INODE_VERSION(inode) == MINIX_V1)
376 return V1_minix_get_block(inode, block, bh_result, create);
377 else
378 return V2_minix_get_block(inode, block, bh_result, create);
379}
380
381static int minix_writepage(struct page *page, struct writeback_control *wbc)
382{
383 return block_write_full_page(page, minix_get_block, wbc);
384}
Nick Piggin4a66af92007-10-16 01:25:21 -0700385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386static int minix_readpage(struct file *file, struct page *page)
387{
388 return block_read_full_page(page,minix_get_block);
389}
Nick Piggin4a66af92007-10-16 01:25:21 -0700390
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200391int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Christoph Hellwig6e1db882010-06-04 11:29:57 +0200393 return __block_write_begin(page, pos, len, minix_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
Nick Piggin4a66af92007-10-16 01:25:21 -0700395
Marco Stornelli7fc7cd02012-12-15 11:56:25 +0100396static void minix_write_failed(struct address_space *mapping, loff_t to)
397{
398 struct inode *inode = mapping->host;
399
400 if (to > inode->i_size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700401 truncate_pagecache(inode, inode->i_size);
Marco Stornelli7fc7cd02012-12-15 11:56:25 +0100402 minix_truncate(inode);
403 }
404}
405
Nick Piggin4a66af92007-10-16 01:25:21 -0700406static int minix_write_begin(struct file *file, struct address_space *mapping,
407 loff_t pos, unsigned len, unsigned flags,
408 struct page **pagep, void **fsdata)
409{
Christoph Hellwig155130a2010-06-04 11:29:58 +0200410 int ret;
411
412 ret = block_write_begin(mapping, pos, len, flags, pagep,
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200413 minix_get_block);
Marco Stornelli7fc7cd02012-12-15 11:56:25 +0100414 if (unlikely(ret))
415 minix_write_failed(mapping, pos + len);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200416
417 return ret;
Nick Piggin4a66af92007-10-16 01:25:21 -0700418}
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420static sector_t minix_bmap(struct address_space *mapping, sector_t block)
421{
422 return generic_block_bmap(mapping,block,minix_get_block);
423}
Nick Piggin4a66af92007-10-16 01:25:21 -0700424
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700425static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 .readpage = minix_readpage,
427 .writepage = minix_writepage,
Nick Piggin4a66af92007-10-16 01:25:21 -0700428 .write_begin = minix_write_begin,
429 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 .bmap = minix_bmap
431};
432
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800433static const struct inode_operations minix_symlink_inode_operations = {
Al Viro6b255392015-11-17 10:20:54 -0500434 .get_link = page_get_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 .getattr = minix_getattr,
436};
437
438void minix_set_inode(struct inode *inode, dev_t rdev)
439{
440 if (S_ISREG(inode->i_mode)) {
441 inode->i_op = &minix_file_inode_operations;
442 inode->i_fop = &minix_file_operations;
443 inode->i_mapping->a_ops = &minix_aops;
444 } else if (S_ISDIR(inode->i_mode)) {
445 inode->i_op = &minix_dir_inode_operations;
446 inode->i_fop = &minix_dir_operations;
447 inode->i_mapping->a_ops = &minix_aops;
448 } else if (S_ISLNK(inode->i_mode)) {
449 inode->i_op = &minix_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -0500450 inode_nohighmem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 inode->i_mapping->a_ops = &minix_aops;
452 } else
453 init_special_inode(inode, inode->i_mode, rdev);
454}
455
456/*
457 * The minix V1 function to read an inode.
458 */
David Howellsa90a08802008-02-07 00:15:44 -0800459static struct inode *V1_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
461 struct buffer_head * bh;
462 struct minix_inode * raw_inode;
463 struct minix_inode_info *minix_inode = minix_i(inode);
464 int i;
465
466 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
467 if (!raw_inode) {
David Howellsa90a08802008-02-07 00:15:44 -0800468 iget_failed(inode);
469 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 }
471 inode->i_mode = raw_inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800472 i_uid_write(inode, raw_inode->i_uid);
473 i_gid_write(inode, raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200474 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 inode->i_size = raw_inode->i_size;
476 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
477 inode->i_mtime.tv_nsec = 0;
478 inode->i_atime.tv_nsec = 0;
479 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700480 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 for (i = 0; i < 9; i++)
482 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
483 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
484 brelse(bh);
David Howellsa90a08802008-02-07 00:15:44 -0800485 unlock_new_inode(inode);
486 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487}
488
489/*
490 * The minix V2 function to read an inode.
491 */
David Howellsa90a08802008-02-07 00:15:44 -0800492static struct inode *V2_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493{
494 struct buffer_head * bh;
495 struct minix2_inode * raw_inode;
496 struct minix_inode_info *minix_inode = minix_i(inode);
497 int i;
498
499 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
500 if (!raw_inode) {
David Howellsa90a08802008-02-07 00:15:44 -0800501 iget_failed(inode);
502 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 }
504 inode->i_mode = raw_inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800505 i_uid_write(inode, raw_inode->i_uid);
506 i_gid_write(inode, raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200507 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 inode->i_size = raw_inode->i_size;
509 inode->i_mtime.tv_sec = raw_inode->i_mtime;
510 inode->i_atime.tv_sec = raw_inode->i_atime;
511 inode->i_ctime.tv_sec = raw_inode->i_ctime;
512 inode->i_mtime.tv_nsec = 0;
513 inode->i_atime.tv_nsec = 0;
514 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700515 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 for (i = 0; i < 10; i++)
517 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
518 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
519 brelse(bh);
David Howellsa90a08802008-02-07 00:15:44 -0800520 unlock_new_inode(inode);
521 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522}
523
524/*
525 * The global function to read an inode.
526 */
David Howellsa90a08802008-02-07 00:15:44 -0800527struct inode *minix_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
David Howellsa90a08802008-02-07 00:15:44 -0800529 struct inode *inode;
530
531 inode = iget_locked(sb, ino);
532 if (!inode)
533 return ERR_PTR(-ENOMEM);
534 if (!(inode->i_state & I_NEW))
535 return inode;
536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 if (INODE_VERSION(inode) == MINIX_V1)
David Howellsa90a08802008-02-07 00:15:44 -0800538 return V1_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 else
David Howellsa90a08802008-02-07 00:15:44 -0800540 return V2_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
543/*
544 * The minix V1 function to synchronize an inode.
545 */
546static struct buffer_head * V1_minix_update_inode(struct inode * inode)
547{
548 struct buffer_head * bh;
549 struct minix_inode * raw_inode;
550 struct minix_inode_info *minix_inode = minix_i(inode);
551 int i;
552
553 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
554 if (!raw_inode)
555 return NULL;
556 raw_inode->i_mode = inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800557 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
558 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 raw_inode->i_nlinks = inode->i_nlink;
560 raw_inode->i_size = inode->i_size;
561 raw_inode->i_time = inode->i_mtime.tv_sec;
562 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
563 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
564 else for (i = 0; i < 9; i++)
565 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
566 mark_buffer_dirty(bh);
567 return bh;
568}
569
570/*
571 * The minix V2 function to synchronize an inode.
572 */
573static struct buffer_head * V2_minix_update_inode(struct inode * inode)
574{
575 struct buffer_head * bh;
576 struct minix2_inode * raw_inode;
577 struct minix_inode_info *minix_inode = minix_i(inode);
578 int i;
579
580 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
581 if (!raw_inode)
582 return NULL;
583 raw_inode->i_mode = inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800584 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
585 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 raw_inode->i_nlinks = inode->i_nlink;
587 raw_inode->i_size = inode->i_size;
588 raw_inode->i_mtime = inode->i_mtime.tv_sec;
589 raw_inode->i_atime = inode->i_atime.tv_sec;
590 raw_inode->i_ctime = inode->i_ctime.tv_sec;
591 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
592 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
593 else for (i = 0; i < 10; i++)
594 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
595 mark_buffer_dirty(bh);
596 return bh;
597}
598
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100599static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
601 int err = 0;
602 struct buffer_head *bh;
603
Al Viro0d7916d2009-06-07 15:21:06 -0400604 if (INODE_VERSION(inode) == MINIX_V1)
605 bh = V1_minix_update_inode(inode);
606 else
607 bh = V2_minix_update_inode(inode);
608 if (!bh)
609 return -EIO;
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100610 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 sync_dirty_buffer(bh);
Al Viro0d7916d2009-06-07 15:21:06 -0400612 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800613 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 inode->i_sb->s_id, inode->i_ino);
Al Viro0d7916d2009-06-07 15:21:06 -0400615 err = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 }
617 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 brelse (bh);
619 return err;
620}
621
David Howellsa528d352017-01-31 16:46:22 +0000622int minix_getattr(const struct path *path, struct kstat *stat,
623 u32 request_mask, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
David Howellsa528d352017-01-31 16:46:22 +0000625 struct super_block *sb = path->dentry->d_sb;
626 struct inode *inode = d_inode(path->dentry);
627
628 generic_fillattr(inode, stat);
629 if (INODE_VERSION(inode) == MINIX_V1)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800630 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 else
Andries Brouwer939b00d2007-02-12 00:52:49 -0800632 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
633 stat->blksize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return 0;
635}
636
637/*
638 * The function that is called for file truncation.
639 */
640void minix_truncate(struct inode * inode)
641{
642 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
643 return;
644 if (INODE_VERSION(inode) == MINIX_V1)
645 V1_minix_truncate(inode);
646 else
647 V2_minix_truncate(inode);
648}
649
Al Viro152a0832010-07-25 00:46:55 +0400650static struct dentry *minix_mount(struct file_system_type *fs_type,
651 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
Al Viro152a0832010-07-25 00:46:55 +0400653 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654}
655
656static struct file_system_type minix_fs_type = {
657 .owner = THIS_MODULE,
658 .name = "minix",
Al Viro152a0832010-07-25 00:46:55 +0400659 .mount = minix_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 .kill_sb = kill_block_super,
661 .fs_flags = FS_REQUIRES_DEV,
662};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800663MODULE_ALIAS_FS("minix");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
665static int __init init_minix_fs(void)
666{
667 int err = init_inodecache();
668 if (err)
669 goto out1;
670 err = register_filesystem(&minix_fs_type);
671 if (err)
672 goto out;
673 return 0;
674out:
675 destroy_inodecache();
676out1:
677 return err;
678}
679
680static void __exit exit_minix_fs(void)
681{
682 unregister_filesystem(&minix_fs_type);
683 destroy_inodecache();
684}
685
686module_init(init_minix_fs)
687module_exit(exit_minix_fs)
688MODULE_LICENSE("GPL");
689