Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/minix/inode.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
Gertjan van Wingerde | f762dd6 | 2009-03-21 23:18:57 +0100 | [diff] [blame] | 6 | * Copyright (C) 1996 Gertjan van Wingerde |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Minix V2 fs support. |
| 8 | * |
| 9 | * Modified for 680x0 by Andreas Schwab |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 10 | * Updated to filesystem version 3 by Daniel Aragones |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 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 Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 20 | #include <linux/writeback.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 22 | static int minix_write_inode(struct inode *inode, |
| 23 | struct writeback_control *wbc); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 24 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | static int minix_remount (struct super_block * sb, int * flags, char * data); |
| 26 | |
Al Viro | 5ccb4a7 | 2010-06-04 22:27:38 -0400 | [diff] [blame] | 27 | static void minix_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | { |
Mark Fasheh | fef2665 | 2005-09-09 13:01:31 -0700 | [diff] [blame] | 29 | truncate_inode_pages(&inode->i_data, 0); |
Al Viro | 5ccb4a7 | 2010-06-04 22:27:38 -0400 | [diff] [blame] | 30 | if (!inode->i_nlink) { |
| 31 | inode->i_size = 0; |
| 32 | minix_truncate(inode); |
| 33 | } |
| 34 | invalidate_inode_buffers(inode); |
| 35 | end_writeback(inode); |
| 36 | if (!inode->i_nlink) |
| 37 | minix_free_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | static void minix_put_super(struct super_block *sb) |
| 41 | { |
| 42 | int i; |
| 43 | struct minix_sb_info *sbi = minix_sb(sb); |
| 44 | |
| 45 | if (!(sb->s_flags & MS_RDONLY)) { |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 46 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 60 | static struct kmem_cache * minix_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | static struct inode *minix_alloc_inode(struct super_block *sb) |
| 63 | { |
| 64 | struct minix_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 65 | ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | if (!ei) |
| 67 | return NULL; |
| 68 | return &ei->vfs_inode; |
| 69 | } |
| 70 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 71 | static void minix_i_callback(struct rcu_head *head) |
| 72 | { |
| 73 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 74 | INIT_LIST_HEAD(&inode->i_dentry); |
| 75 | kmem_cache_free(minix_inode_cachep, minix_i(inode)); |
| 76 | } |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | static void minix_destroy_inode(struct inode *inode) |
| 79 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 80 | call_rcu(&inode->i_rcu, minix_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
| 82 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 83 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
| 85 | struct minix_inode_info *ei = (struct minix_inode_info *) foo; |
| 86 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 87 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | static int init_inodecache(void) |
| 91 | { |
| 92 | minix_inode_cachep = kmem_cache_create("minix_inode_cache", |
| 93 | sizeof(struct minix_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 94 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 95 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 96 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | if (minix_inode_cachep == NULL) |
| 98 | return -ENOMEM; |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static void destroy_inodecache(void) |
| 103 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 104 | kmem_cache_destroy(minix_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 107 | static const struct super_operations minix_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | .alloc_inode = minix_alloc_inode, |
| 109 | .destroy_inode = minix_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | .write_inode = minix_write_inode, |
Al Viro | 5ccb4a7 | 2010-06-04 22:27:38 -0400 | [diff] [blame] | 111 | .evict_inode = minix_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | .put_super = minix_put_super, |
| 113 | .statfs = minix_statfs, |
| 114 | .remount_fs = minix_remount, |
| 115 | }; |
| 116 | |
| 117 | static int minix_remount (struct super_block * sb, int * flags, char * data) |
| 118 | { |
| 119 | struct minix_sb_info * sbi = minix_sb(sb); |
| 120 | struct minix_super_block * ms; |
| 121 | |
| 122 | ms = sbi->s_ms; |
| 123 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 124 | return 0; |
| 125 | if (*flags & MS_RDONLY) { |
| 126 | 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 Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 130 | if (sbi->s_version != MINIX_V3) |
| 131 | ms->s_state = sbi->s_mount_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | mark_buffer_dirty(sbi->s_sbh); |
| 133 | } else { |
| 134 | /* Mount a partition which is read-only, read-write. */ |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 135 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | mark_buffer_dirty(sbi->s_sbh); |
| 142 | |
| 143 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 144 | printk("MINIX-fs warning: remounting unchecked fs, " |
| 145 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | else if ((sbi->s_mount_state & MINIX_ERROR_FS)) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 147 | printk("MINIX-fs warning: remounting fs with errors, " |
| 148 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static 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 Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 158 | struct minix3_super_block *m3s = NULL; |
| 159 | unsigned long i, block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | struct inode *root_inode; |
| 161 | struct minix_sb_info *sbi; |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 162 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 164 | sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | if (!sbi) |
| 166 | return -ENOMEM; |
| 167 | s->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Alexey Dobriyan | 2ecd05a | 2006-10-11 01:22:05 -0700 | [diff] [blame] | 169 | BUILD_BUG_ON(32 != sizeof (struct minix_inode)); |
| 170 | BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 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; |
| 194 | sbi->s_link_max = MINIX_LINK_MAX; |
| 195 | } else if (s->s_magic == MINIX_SUPER_MAGIC2) { |
| 196 | sbi->s_version = MINIX_V1; |
| 197 | sbi->s_dirsize = 32; |
| 198 | sbi->s_namelen = 30; |
| 199 | sbi->s_link_max = MINIX_LINK_MAX; |
| 200 | } 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; |
| 205 | sbi->s_link_max = MINIX2_LINK_MAX; |
| 206 | } 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; |
| 211 | sbi->s_link_max = MINIX2_LINK_MAX; |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 212 | } 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; |
| 225 | sbi->s_link_max = MINIX2_LINK_MAX; |
| 226 | sbi->s_mount_state = MINIX_VALID_FS; |
| 227 | sb_set_blocksize(s, m3s->s_blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } else |
| 229 | goto out_no_fs; |
| 230 | |
| 231 | /* |
| 232 | * Allocate the buffer map to keep the superblock small. |
| 233 | */ |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 234 | if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) |
| 235 | goto out_illegal_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 237 | map = kzalloc(i, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if (!map) |
| 239 | goto out_no_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | 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 | |
| 258 | /* set up enough so that it can read an inode */ |
| 259 | s->s_op = &minix_sops; |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 260 | root_inode = minix_iget(s, MINIX_ROOT_INO); |
| 261 | if (IS_ERR(root_inode)) { |
| 262 | ret = PTR_ERR(root_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | goto out_no_root; |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 264 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 266 | ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | s->s_root = d_alloc_root(root_inode); |
| 268 | if (!s->s_root) |
| 269 | goto out_iput; |
| 270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | if (!(s->s_flags & MS_RDONLY)) { |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 272 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
| 273 | ms->s_state &= ~MINIX_VALID_FS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | mark_buffer_dirty(bh); |
| 275 | } |
| 276 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 277 | printk("MINIX-fs: mounting unchecked file system, " |
| 278 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | else if (sbi->s_mount_state & MINIX_ERROR_FS) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 280 | printk("MINIX-fs: mounting file system with errors, " |
| 281 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | return 0; |
| 283 | |
| 284 | out_iput: |
| 285 | iput(root_inode); |
| 286 | goto out_freemap; |
| 287 | |
| 288 | out_no_root: |
| 289 | if (!silent) |
| 290 | printk("MINIX-fs: get root inode failed\n"); |
| 291 | goto out_freemap; |
| 292 | |
| 293 | out_no_bitmap: |
| 294 | printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 295 | out_freemap: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | for (i = 0; i < sbi->s_imap_blocks; i++) |
| 297 | brelse(sbi->s_imap[i]); |
| 298 | for (i = 0; i < sbi->s_zmap_blocks; i++) |
| 299 | brelse(sbi->s_zmap[i]); |
| 300 | kfree(sbi->s_imap); |
| 301 | goto out_release; |
| 302 | |
| 303 | out_no_map: |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 304 | ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | if (!silent) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 306 | printk("MINIX-fs: can't allocate map\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | goto out_release; |
| 308 | |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 309 | out_illegal_sb: |
| 310 | if (!silent) |
| 311 | printk("MINIX-fs: bad superblock\n"); |
| 312 | goto out_release; |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | out_no_fs: |
| 315 | if (!silent) |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 316 | printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " |
| 317 | "on device %s.\n", s->s_id); |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 318 | out_release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | brelse(bh); |
| 320 | goto out; |
| 321 | |
| 322 | out_bad_hblock: |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 323 | printk("MINIX-fs: blocksize too small for device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | goto out; |
| 325 | |
| 326 | out_bad_sb: |
| 327 | printk("MINIX-fs: unable to read superblock\n"); |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 328 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | s->s_fs_info = NULL; |
| 330 | kfree(sbi); |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 331 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | } |
| 333 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 334 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
Coly Li | 054475d | 2009-04-02 16:59:39 -0700 | [diff] [blame] | 336 | struct super_block *sb = dentry->d_sb; |
| 337 | struct minix_sb_info *sbi = minix_sb(sb); |
| 338 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
| 339 | buf->f_type = sb->s_magic; |
| 340 | buf->f_bsize = sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; |
| 342 | buf->f_bfree = minix_count_free_blocks(sbi); |
| 343 | buf->f_bavail = buf->f_bfree; |
| 344 | buf->f_files = sbi->s_ninodes; |
| 345 | buf->f_ffree = minix_count_free_inodes(sbi); |
| 346 | buf->f_namelen = sbi->s_namelen; |
Coly Li | 054475d | 2009-04-02 16:59:39 -0700 | [diff] [blame] | 347 | buf->f_fsid.val[0] = (u32)id; |
| 348 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | static int minix_get_block(struct inode *inode, sector_t block, |
| 354 | struct buffer_head *bh_result, int create) |
| 355 | { |
| 356 | if (INODE_VERSION(inode) == MINIX_V1) |
| 357 | return V1_minix_get_block(inode, block, bh_result, create); |
| 358 | else |
| 359 | return V2_minix_get_block(inode, block, bh_result, create); |
| 360 | } |
| 361 | |
| 362 | static int minix_writepage(struct page *page, struct writeback_control *wbc) |
| 363 | { |
| 364 | return block_write_full_page(page, minix_get_block, wbc); |
| 365 | } |
Nick Piggin | 4a66af9 | 2007-10-16 01:25:21 -0700 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | static int minix_readpage(struct file *file, struct page *page) |
| 368 | { |
| 369 | return block_read_full_page(page,minix_get_block); |
| 370 | } |
Nick Piggin | 4a66af9 | 2007-10-16 01:25:21 -0700 | [diff] [blame] | 371 | |
Christoph Hellwig | f4e420d | 2010-06-04 11:29:56 +0200 | [diff] [blame] | 372 | int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | { |
Christoph Hellwig | 6e1db88 | 2010-06-04 11:29:57 +0200 | [diff] [blame] | 374 | return __block_write_begin(page, pos, len, minix_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
Nick Piggin | 4a66af9 | 2007-10-16 01:25:21 -0700 | [diff] [blame] | 376 | |
| 377 | static int minix_write_begin(struct file *file, struct address_space *mapping, |
| 378 | loff_t pos, unsigned len, unsigned flags, |
| 379 | struct page **pagep, void **fsdata) |
| 380 | { |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 381 | int ret; |
| 382 | |
| 383 | ret = block_write_begin(mapping, pos, len, flags, pagep, |
Christoph Hellwig | f4e420d | 2010-06-04 11:29:56 +0200 | [diff] [blame] | 384 | minix_get_block); |
Christoph Hellwig | 155130a | 2010-06-04 11:29:58 +0200 | [diff] [blame] | 385 | if (unlikely(ret)) { |
| 386 | loff_t isize = mapping->host->i_size; |
| 387 | if (pos + len > isize) |
| 388 | vmtruncate(mapping->host, isize); |
| 389 | } |
| 390 | |
| 391 | return ret; |
Nick Piggin | 4a66af9 | 2007-10-16 01:25:21 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | static sector_t minix_bmap(struct address_space *mapping, sector_t block) |
| 395 | { |
| 396 | return generic_block_bmap(mapping,block,minix_get_block); |
| 397 | } |
Nick Piggin | 4a66af9 | 2007-10-16 01:25:21 -0700 | [diff] [blame] | 398 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 399 | static const struct address_space_operations minix_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | .readpage = minix_readpage, |
| 401 | .writepage = minix_writepage, |
Nick Piggin | 4a66af9 | 2007-10-16 01:25:21 -0700 | [diff] [blame] | 402 | .write_begin = minix_write_begin, |
| 403 | .write_end = generic_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | .bmap = minix_bmap |
| 405 | }; |
| 406 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 407 | static const struct inode_operations minix_symlink_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | .readlink = generic_readlink, |
| 409 | .follow_link = page_follow_link_light, |
| 410 | .put_link = page_put_link, |
| 411 | .getattr = minix_getattr, |
| 412 | }; |
| 413 | |
| 414 | void minix_set_inode(struct inode *inode, dev_t rdev) |
| 415 | { |
| 416 | if (S_ISREG(inode->i_mode)) { |
| 417 | inode->i_op = &minix_file_inode_operations; |
| 418 | inode->i_fop = &minix_file_operations; |
| 419 | inode->i_mapping->a_ops = &minix_aops; |
| 420 | } else if (S_ISDIR(inode->i_mode)) { |
| 421 | inode->i_op = &minix_dir_inode_operations; |
| 422 | inode->i_fop = &minix_dir_operations; |
| 423 | inode->i_mapping->a_ops = &minix_aops; |
| 424 | } else if (S_ISLNK(inode->i_mode)) { |
| 425 | inode->i_op = &minix_symlink_inode_operations; |
| 426 | inode->i_mapping->a_ops = &minix_aops; |
| 427 | } else |
| 428 | init_special_inode(inode, inode->i_mode, rdev); |
| 429 | } |
| 430 | |
| 431 | /* |
| 432 | * The minix V1 function to read an inode. |
| 433 | */ |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 434 | static struct inode *V1_minix_iget(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
| 436 | struct buffer_head * bh; |
| 437 | struct minix_inode * raw_inode; |
| 438 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 439 | int i; |
| 440 | |
| 441 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 442 | if (!raw_inode) { |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 443 | iget_failed(inode); |
| 444 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | } |
| 446 | inode->i_mode = raw_inode->i_mode; |
| 447 | inode->i_uid = (uid_t)raw_inode->i_uid; |
| 448 | inode->i_gid = (gid_t)raw_inode->i_gid; |
| 449 | inode->i_nlink = raw_inode->i_nlinks; |
| 450 | inode->i_size = raw_inode->i_size; |
| 451 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; |
| 452 | inode->i_mtime.tv_nsec = 0; |
| 453 | inode->i_atime.tv_nsec = 0; |
| 454 | inode->i_ctime.tv_nsec = 0; |
Theodore Ts'o | ba52de1 | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 455 | inode->i_blocks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | for (i = 0; i < 9; i++) |
| 457 | minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; |
| 458 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); |
| 459 | brelse(bh); |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 460 | unlock_new_inode(inode); |
| 461 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | /* |
| 465 | * The minix V2 function to read an inode. |
| 466 | */ |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 467 | static struct inode *V2_minix_iget(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | { |
| 469 | struct buffer_head * bh; |
| 470 | struct minix2_inode * raw_inode; |
| 471 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 472 | int i; |
| 473 | |
| 474 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 475 | if (!raw_inode) { |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 476 | iget_failed(inode); |
| 477 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | inode->i_mode = raw_inode->i_mode; |
| 480 | inode->i_uid = (uid_t)raw_inode->i_uid; |
| 481 | inode->i_gid = (gid_t)raw_inode->i_gid; |
| 482 | inode->i_nlink = raw_inode->i_nlinks; |
| 483 | inode->i_size = raw_inode->i_size; |
| 484 | inode->i_mtime.tv_sec = raw_inode->i_mtime; |
| 485 | inode->i_atime.tv_sec = raw_inode->i_atime; |
| 486 | inode->i_ctime.tv_sec = raw_inode->i_ctime; |
| 487 | inode->i_mtime.tv_nsec = 0; |
| 488 | inode->i_atime.tv_nsec = 0; |
| 489 | inode->i_ctime.tv_nsec = 0; |
Theodore Ts'o | ba52de1 | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 490 | inode->i_blocks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | for (i = 0; i < 10; i++) |
| 492 | minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; |
| 493 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); |
| 494 | brelse(bh); |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 495 | unlock_new_inode(inode); |
| 496 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | /* |
| 500 | * The global function to read an inode. |
| 501 | */ |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 502 | struct inode *minix_iget(struct super_block *sb, unsigned long ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | { |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 504 | struct inode *inode; |
| 505 | |
| 506 | inode = iget_locked(sb, ino); |
| 507 | if (!inode) |
| 508 | return ERR_PTR(-ENOMEM); |
| 509 | if (!(inode->i_state & I_NEW)) |
| 510 | return inode; |
| 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | if (INODE_VERSION(inode) == MINIX_V1) |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 513 | return V1_minix_iget(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | else |
David Howells | a90a0880 | 2008-02-07 00:15:44 -0800 | [diff] [blame] | 515 | return V2_minix_iget(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | /* |
| 519 | * The minix V1 function to synchronize an inode. |
| 520 | */ |
| 521 | static struct buffer_head * V1_minix_update_inode(struct inode * inode) |
| 522 | { |
| 523 | struct buffer_head * bh; |
| 524 | struct minix_inode * raw_inode; |
| 525 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 526 | int i; |
| 527 | |
| 528 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 529 | if (!raw_inode) |
| 530 | return NULL; |
| 531 | raw_inode->i_mode = inode->i_mode; |
| 532 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); |
| 533 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); |
| 534 | raw_inode->i_nlinks = inode->i_nlink; |
| 535 | raw_inode->i_size = inode->i_size; |
| 536 | raw_inode->i_time = inode->i_mtime.tv_sec; |
| 537 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| 538 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); |
| 539 | else for (i = 0; i < 9; i++) |
| 540 | raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; |
| 541 | mark_buffer_dirty(bh); |
| 542 | return bh; |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * The minix V2 function to synchronize an inode. |
| 547 | */ |
| 548 | static struct buffer_head * V2_minix_update_inode(struct inode * inode) |
| 549 | { |
| 550 | struct buffer_head * bh; |
| 551 | struct minix2_inode * raw_inode; |
| 552 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 553 | int i; |
| 554 | |
| 555 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 556 | if (!raw_inode) |
| 557 | return NULL; |
| 558 | raw_inode->i_mode = inode->i_mode; |
| 559 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); |
| 560 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); |
| 561 | raw_inode->i_nlinks = inode->i_nlink; |
| 562 | raw_inode->i_size = inode->i_size; |
| 563 | raw_inode->i_mtime = inode->i_mtime.tv_sec; |
| 564 | raw_inode->i_atime = inode->i_atime.tv_sec; |
| 565 | raw_inode->i_ctime = inode->i_ctime.tv_sec; |
| 566 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| 567 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); |
| 568 | else for (i = 0; i < 10; i++) |
| 569 | raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; |
| 570 | mark_buffer_dirty(bh); |
| 571 | return bh; |
| 572 | } |
| 573 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 574 | static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | { |
| 576 | int err = 0; |
| 577 | struct buffer_head *bh; |
| 578 | |
Al Viro | 0d7916d | 2009-06-07 15:21:06 -0400 | [diff] [blame] | 579 | if (INODE_VERSION(inode) == MINIX_V1) |
| 580 | bh = V1_minix_update_inode(inode); |
| 581 | else |
| 582 | bh = V2_minix_update_inode(inode); |
| 583 | if (!bh) |
| 584 | return -EIO; |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 585 | if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | sync_dirty_buffer(bh); |
Al Viro | 0d7916d | 2009-06-07 15:21:06 -0400 | [diff] [blame] | 587 | if (buffer_req(bh) && !buffer_uptodate(bh)) { |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 588 | printk("IO error syncing minix inode [%s:%08lx]\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | inode->i_sb->s_id, inode->i_ino); |
Al Viro | 0d7916d | 2009-06-07 15:21:06 -0400 | [diff] [blame] | 590 | err = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } |
| 592 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | brelse (bh); |
| 594 | return err; |
| 595 | } |
| 596 | |
| 597 | int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 598 | { |
Al Viro | 2def9e4 | 2011-07-16 17:43:09 -0400 | [diff] [blame] | 599 | struct super_block *sb = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | generic_fillattr(dentry->d_inode, stat); |
| 601 | if (INODE_VERSION(dentry->d_inode) == MINIX_V1) |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 602 | stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | else |
Andries Brouwer | 939b00d | 2007-02-12 00:52:49 -0800 | [diff] [blame] | 604 | stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); |
| 605 | stat->blksize = sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return 0; |
| 607 | } |
| 608 | |
| 609 | /* |
| 610 | * The function that is called for file truncation. |
| 611 | */ |
| 612 | void minix_truncate(struct inode * inode) |
| 613 | { |
| 614 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) |
| 615 | return; |
| 616 | if (INODE_VERSION(inode) == MINIX_V1) |
| 617 | V1_minix_truncate(inode); |
| 618 | else |
| 619 | V2_minix_truncate(inode); |
| 620 | } |
| 621 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 622 | static struct dentry *minix_mount(struct file_system_type *fs_type, |
| 623 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 625 | return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | static struct file_system_type minix_fs_type = { |
| 629 | .owner = THIS_MODULE, |
| 630 | .name = "minix", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 631 | .mount = minix_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | .kill_sb = kill_block_super, |
| 633 | .fs_flags = FS_REQUIRES_DEV, |
| 634 | }; |
| 635 | |
| 636 | static int __init init_minix_fs(void) |
| 637 | { |
| 638 | int err = init_inodecache(); |
| 639 | if (err) |
| 640 | goto out1; |
| 641 | err = register_filesystem(&minix_fs_type); |
| 642 | if (err) |
| 643 | goto out; |
| 644 | return 0; |
| 645 | out: |
| 646 | destroy_inodecache(); |
| 647 | out1: |
| 648 | return err; |
| 649 | } |
| 650 | |
| 651 | static void __exit exit_minix_fs(void) |
| 652 | { |
| 653 | unregister_filesystem(&minix_fs_type); |
| 654 | destroy_inodecache(); |
| 655 | } |
| 656 | |
| 657 | module_init(init_minix_fs) |
| 658 | module_exit(exit_minix_fs) |
| 659 | MODULE_LICENSE("GPL"); |
| 660 | |