Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * QNX4 file system, Linux implementation. |
| 3 | * |
| 4 | * Version : 0.2.1 |
| 5 | * |
| 6 | * Using parts of the xiafs filesystem. |
| 7 | * |
| 8 | * History : |
| 9 | * |
| 10 | * 01-06-1998 by Richard Frowijn : first release. |
| 11 | * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc. |
| 12 | * 30-06-1998 by Frank Denis : first step to write inodes. |
| 13 | */ |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/init.h> |
Al Viro | 964f536 | 2009-06-07 09:47:13 -0400 | [diff] [blame] | 17 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/highuid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
| 20 | #include <linux/buffer_head.h> |
Al Viro | 79d2576 | 2009-06-07 09:30:08 -0400 | [diff] [blame] | 21 | #include <linux/writeback.h> |
Al Viro | 964f536 | 2009-06-07 09:47:13 -0400 | [diff] [blame] | 22 | #include <linux/statfs.h> |
| 23 | #include "qnx4.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #define QNX4_VERSION 4 |
| 26 | #define QNX4_BMNAME ".bitmap" |
| 27 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 28 | static const struct super_operations qnx4_sops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | static void qnx4_put_super(struct super_block *sb); |
| 31 | static struct inode *qnx4_alloc_inode(struct super_block *sb); |
| 32 | static void qnx4_destroy_inode(struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | static int qnx4_remount(struct super_block *sb, int *flags, char *data); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 34 | static int qnx4_statfs(struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 36 | static const struct super_operations qnx4_sops = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | { |
| 38 | .alloc_inode = qnx4_alloc_inode, |
| 39 | .destroy_inode = qnx4_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | .put_super = qnx4_put_super, |
| 41 | .statfs = qnx4_statfs, |
| 42 | .remount_fs = qnx4_remount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | }; |
| 44 | |
| 45 | static int qnx4_remount(struct super_block *sb, int *flags, char *data) |
| 46 | { |
| 47 | struct qnx4_sb_info *qs; |
| 48 | |
| 49 | qs = qnx4_sb(sb); |
| 50 | qs->Version = QNX4_VERSION; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | *flags |= MS_RDONLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static struct buffer_head *qnx4_getblk(struct inode *inode, int nr, |
| 56 | int create) |
| 57 | { |
| 58 | struct buffer_head *result = NULL; |
| 59 | |
| 60 | if ( nr >= 0 ) |
| 61 | nr = qnx4_block_map( inode, nr ); |
| 62 | if (nr) { |
| 63 | result = sb_getblk(inode->i_sb, nr); |
| 64 | return result; |
| 65 | } |
Anders Larsen | ca120b2 | 2009-12-15 16:48:23 -0800 | [diff] [blame] | 66 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | struct buffer_head *qnx4_bread(struct inode *inode, int block, int create) |
| 70 | { |
| 71 | struct buffer_head *bh; |
| 72 | |
| 73 | bh = qnx4_getblk(inode, block, create); |
| 74 | if (!bh || buffer_uptodate(bh)) { |
| 75 | return bh; |
| 76 | } |
| 77 | ll_rw_block(READ, 1, &bh); |
| 78 | wait_on_buffer(bh); |
| 79 | if (buffer_uptodate(bh)) { |
| 80 | return bh; |
| 81 | } |
| 82 | brelse(bh); |
| 83 | |
| 84 | return NULL; |
| 85 | } |
| 86 | |
| 87 | static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create ) |
| 88 | { |
| 89 | unsigned long phys; |
| 90 | |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 91 | QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
| 93 | phys = qnx4_block_map( inode, iblock ); |
| 94 | if ( phys ) { |
| 95 | // logical block is before EOF |
| 96 | map_bh(bh, inode->i_sb, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | unsigned long qnx4_block_map( struct inode *inode, long iblock ) |
| 102 | { |
| 103 | int ix; |
| 104 | long offset, i_xblk; |
| 105 | unsigned long block = 0; |
| 106 | struct buffer_head *bh = NULL; |
| 107 | struct qnx4_xblk *xblk = NULL; |
| 108 | struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode); |
Alexey Dobriyan | 75043cb | 2005-06-24 20:52:52 +0000 | [diff] [blame] | 109 | u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) { |
| 112 | // iblock is in the first extent. This is easy. |
| 113 | block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1; |
| 114 | } else { |
| 115 | // iblock is beyond first extent. We have to follow the extent chain. |
| 116 | i_xblk = le32_to_cpu(qnx4_inode->di_xblk); |
| 117 | offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size); |
| 118 | ix = 0; |
| 119 | while ( --nxtnt > 0 ) { |
| 120 | if ( ix == 0 ) { |
| 121 | // read next xtnt block. |
| 122 | bh = sb_bread(inode->i_sb, i_xblk - 1); |
| 123 | if ( !bh ) { |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 124 | QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | return -EIO; |
| 126 | } |
| 127 | xblk = (struct qnx4_xblk*)bh->b_data; |
| 128 | if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) { |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 129 | QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | return -EIO; |
| 131 | } |
| 132 | } |
| 133 | if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) { |
| 134 | // got it! |
| 135 | block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1; |
| 136 | break; |
| 137 | } |
| 138 | offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size); |
| 139 | if ( ++ix >= xblk->xblk_num_xtnts ) { |
| 140 | i_xblk = le32_to_cpu(xblk->xblk_next_xblk); |
| 141 | ix = 0; |
| 142 | brelse( bh ); |
| 143 | bh = NULL; |
| 144 | } |
| 145 | } |
| 146 | if ( bh ) |
| 147 | brelse( bh ); |
| 148 | } |
| 149 | |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 150 | QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | return block; |
| 152 | } |
| 153 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 154 | static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 156 | struct super_block *sb = dentry->d_sb; |
Coly Li | 5b76dc0 | 2009-04-02 16:59:40 -0700 | [diff] [blame] | 157 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | buf->f_type = sb->s_magic; |
| 160 | buf->f_bsize = sb->s_blocksize; |
| 161 | buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8; |
| 162 | buf->f_bfree = qnx4_count_free_blocks(sb); |
| 163 | buf->f_bavail = buf->f_bfree; |
| 164 | buf->f_namelen = QNX4_NAME_MAX; |
Coly Li | 5b76dc0 | 2009-04-02 16:59:40 -0700 | [diff] [blame] | 165 | buf->f_fsid.val[0] = (u32)id; |
| 166 | buf->f_fsid.val[1] = (u32)(id >> 32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Check the root directory of the filesystem to make sure |
| 173 | * it really _is_ a qnx4 filesystem, and to check the size |
| 174 | * of the directory entry. |
| 175 | */ |
| 176 | static const char *qnx4_checkroot(struct super_block *sb) |
| 177 | { |
| 178 | struct buffer_head *bh; |
| 179 | struct qnx4_inode_entry *rootdir; |
| 180 | int rd, rl; |
| 181 | int i, j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Al Viro | 4134bf8 | 2012-01-19 13:40:57 -0500 | [diff] [blame] | 183 | if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return "no qnx4 filesystem (no root dir)."; |
Al Viro | 4134bf8 | 2012-01-19 13:40:57 -0500 | [diff] [blame] | 185 | QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id)); |
| 186 | rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1; |
| 187 | rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size); |
| 188 | for (j = 0; j < rl; j++) { |
| 189 | bh = sb_bread(sb, rd + j); /* root dir, first block */ |
| 190 | if (bh == NULL) |
| 191 | return "unable to read root entry."; |
| 192 | rootdir = (struct qnx4_inode_entry *) bh->b_data; |
| 193 | for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) { |
| 194 | QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname)); |
| 195 | if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0) |
| 196 | continue; |
| 197 | qnx4_sb(sb)->BitMap = kmemdup(rootdir, |
| 198 | sizeof(struct qnx4_inode_entry), |
| 199 | GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | brelse(bh); |
Al Viro | 4134bf8 | 2012-01-19 13:40:57 -0500 | [diff] [blame] | 201 | if (!qnx4_sb(sb)->BitMap) |
| 202 | return "not enough memory for bitmap inode"; |
| 203 | /* keep bitmap inode known */ |
| 204 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
Al Viro | 4134bf8 | 2012-01-19 13:40:57 -0500 | [diff] [blame] | 206 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
Al Viro | 4134bf8 | 2012-01-19 13:40:57 -0500 | [diff] [blame] | 208 | return "bitmap file not found."; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | static int qnx4_fill_super(struct super_block *s, void *data, int silent) |
| 212 | { |
| 213 | struct buffer_head *bh; |
| 214 | struct inode *root; |
| 215 | const char *errmsg; |
| 216 | struct qnx4_sb_info *qs; |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 217 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 219 | qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL); |
Arnd Bergmann | 073c214 | 2010-10-21 15:53:15 +0200 | [diff] [blame] | 220 | if (!qs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | return -ENOMEM; |
| 222 | s->s_fs_info = qs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | sb_set_blocksize(s, QNX4_BLOCK_SIZE); |
| 225 | |
| 226 | /* Check the superblock signature. Since the qnx4 code is |
| 227 | dangerous, we should leave as quickly as possible |
| 228 | if we don't belong here... */ |
| 229 | bh = sb_bread(s, 1); |
| 230 | if (!bh) { |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 231 | printk(KERN_ERR "qnx4: unable to read the superblock\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | goto outnobh; |
| 233 | } |
Alexey Dobriyan | 75043cb | 2005-06-24 20:52:52 +0000 | [diff] [blame] | 234 | if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | if (!silent) |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 236 | printk(KERN_ERR "qnx4: wrong fsid in superblock.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | goto out; |
| 238 | } |
| 239 | s->s_op = &qnx4_sops; |
| 240 | s->s_magic = QNX4_SUPER_MAGIC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | s->s_flags |= MS_RDONLY; /* Yup, read-only yet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | qnx4_sb(s)->sb_buf = bh; |
| 243 | qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data; |
| 244 | |
| 245 | |
| 246 | /* check before allocating dentries, inodes, .. */ |
| 247 | errmsg = qnx4_checkroot(s); |
| 248 | if (errmsg != NULL) { |
| 249 | if (!silent) |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 250 | printk(KERN_ERR "qnx4: %s\n", errmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | goto out; |
| 252 | } |
| 253 | |
| 254 | /* does root not have inode number QNX4_ROOT_INO ?? */ |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 255 | root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK); |
| 256 | if (IS_ERR(root)) { |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 257 | printk(KERN_ERR "qnx4: get inode failed\n"); |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 258 | ret = PTR_ERR(root); |
Al Viro | 8bc5191 | 2012-01-19 13:54:36 -0500 | [diff] [blame] | 259 | goto outb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 262 | ret = -ENOMEM; |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame^] | 263 | s->s_root = d_make_root(root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (s->s_root == NULL) |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame^] | 265 | goto outb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
| 267 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | return 0; |
| 269 | |
Al Viro | 8bc5191 | 2012-01-19 13:54:36 -0500 | [diff] [blame] | 270 | outb: |
| 271 | kfree(qs->BitMap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | out: |
| 273 | brelse(bh); |
| 274 | outnobh: |
| 275 | kfree(qs); |
| 276 | s->s_fs_info = NULL; |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 277 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static void qnx4_put_super(struct super_block *sb) |
| 281 | { |
| 282 | struct qnx4_sb_info *qs = qnx4_sb(sb); |
| 283 | kfree( qs->BitMap ); |
| 284 | kfree( qs ); |
| 285 | sb->s_fs_info = NULL; |
| 286 | return; |
| 287 | } |
| 288 | |
| 289 | static int qnx4_writepage(struct page *page, struct writeback_control *wbc) |
| 290 | { |
| 291 | return block_write_full_page(page,qnx4_get_block, wbc); |
| 292 | } |
Nick Piggin | f870618 | 2007-10-16 01:25:12 -0700 | [diff] [blame] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | static int qnx4_readpage(struct file *file, struct page *page) |
| 295 | { |
| 296 | return block_read_full_page(page,qnx4_get_block); |
| 297 | } |
Nick Piggin | f870618 | 2007-10-16 01:25:12 -0700 | [diff] [blame] | 298 | |
| 299 | static int qnx4_write_begin(struct file *file, struct address_space *mapping, |
| 300 | loff_t pos, unsigned len, unsigned flags, |
| 301 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
Nick Piggin | f870618 | 2007-10-16 01:25:12 -0700 | [diff] [blame] | 303 | struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host); |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 304 | int ret; |
| 305 | |
Nick Piggin | f870618 | 2007-10-16 01:25:12 -0700 | [diff] [blame] | 306 | *pagep = NULL; |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 307 | ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
Nick Piggin | f870618 | 2007-10-16 01:25:12 -0700 | [diff] [blame] | 308 | qnx4_get_block, |
| 309 | &qnx4_inode->mmu_private); |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 310 | if (unlikely(ret)) { |
| 311 | loff_t isize = mapping->host->i_size; |
| 312 | if (pos + len > isize) |
| 313 | vmtruncate(mapping->host, isize); |
| 314 | } |
| 315 | |
| 316 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
| 318 | static sector_t qnx4_bmap(struct address_space *mapping, sector_t block) |
| 319 | { |
| 320 | return generic_block_bmap(mapping,block,qnx4_get_block); |
| 321 | } |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 322 | static const struct address_space_operations qnx4_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | .readpage = qnx4_readpage, |
| 324 | .writepage = qnx4_writepage, |
Nick Piggin | f870618 | 2007-10-16 01:25:12 -0700 | [diff] [blame] | 325 | .write_begin = qnx4_write_begin, |
| 326 | .write_end = generic_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | .bmap = qnx4_bmap |
| 328 | }; |
| 329 | |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 330 | struct inode *qnx4_iget(struct super_block *sb, unsigned long ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
| 332 | struct buffer_head *bh; |
| 333 | struct qnx4_inode_entry *raw_inode; |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 334 | int block; |
| 335 | struct qnx4_inode_entry *qnx4_inode; |
| 336 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 338 | inode = iget_locked(sb, ino); |
| 339 | if (!inode) |
| 340 | return ERR_PTR(-ENOMEM); |
| 341 | if (!(inode->i_state & I_NEW)) |
| 342 | return inode; |
| 343 | |
| 344 | qnx4_inode = qnx4_raw_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | inode->i_mode = 0; |
| 346 | |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 347 | QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | if (!ino) { |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 349 | printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is " |
| 350 | "out of range\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | sb->s_id, ino); |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 352 | iget_failed(inode); |
| 353 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | block = ino / QNX4_INODES_PER_BLOCK; |
| 356 | |
| 357 | if (!(bh = sb_bread(sb, block))) { |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 358 | printk(KERN_ERR "qnx4: major problem: unable to read inode from dev " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | "%s\n", sb->s_id); |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 360 | iget_failed(inode); |
| 361 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | raw_inode = ((struct qnx4_inode_entry *) bh->b_data) + |
| 364 | (ino % QNX4_INODES_PER_BLOCK); |
| 365 | |
| 366 | inode->i_mode = le16_to_cpu(raw_inode->di_mode); |
| 367 | inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid); |
| 368 | inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 369 | set_nlink(inode, le16_to_cpu(raw_inode->di_nlink)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | inode->i_size = le32_to_cpu(raw_inode->di_size); |
| 371 | inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime); |
| 372 | inode->i_mtime.tv_nsec = 0; |
| 373 | inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime); |
| 374 | inode->i_atime.tv_nsec = 0; |
| 375 | inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime); |
| 376 | inode->i_ctime.tv_nsec = 0; |
| 377 | inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE); |
| 380 | if (S_ISREG(inode->i_mode)) { |
Christoph Hellwig | 945ffe5 | 2009-09-22 16:43:59 -0700 | [diff] [blame] | 381 | inode->i_fop = &generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | inode->i_mapping->a_ops = &qnx4_aops; |
| 383 | qnx4_i(inode)->mmu_private = inode->i_size; |
| 384 | } else if (S_ISDIR(inode->i_mode)) { |
| 385 | inode->i_op = &qnx4_dir_inode_operations; |
| 386 | inode->i_fop = &qnx4_dir_operations; |
| 387 | } else if (S_ISLNK(inode->i_mode)) { |
| 388 | inode->i_op = &page_symlink_inode_operations; |
| 389 | inode->i_mapping->a_ops = &qnx4_aops; |
| 390 | qnx4_i(inode)->mmu_private = inode->i_size; |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 391 | } else { |
| 392 | printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n", |
| 393 | ino, sb->s_id); |
| 394 | iget_failed(inode); |
| 395 | brelse(bh); |
| 396 | return ERR_PTR(-EIO); |
| 397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | brelse(bh); |
David Howells | 2b7e5bc | 2008-02-07 00:15:45 -0800 | [diff] [blame] | 399 | unlock_new_inode(inode); |
| 400 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 403 | static struct kmem_cache *qnx4_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
| 405 | static struct inode *qnx4_alloc_inode(struct super_block *sb) |
| 406 | { |
| 407 | struct qnx4_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 408 | ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | if (!ei) |
| 410 | return NULL; |
| 411 | return &ei->vfs_inode; |
| 412 | } |
| 413 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 414 | static void qnx4_i_callback(struct rcu_head *head) |
| 415 | { |
| 416 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 417 | kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode)); |
| 418 | } |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | static void qnx4_destroy_inode(struct inode *inode) |
| 421 | { |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 422 | call_rcu(&inode->i_rcu, qnx4_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
| 424 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 425 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | { |
| 427 | struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo; |
| 428 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 429 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | static int init_inodecache(void) |
| 433 | { |
| 434 | qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache", |
| 435 | sizeof(struct qnx4_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 436 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 437 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 438 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | if (qnx4_inode_cachep == NULL) |
| 440 | return -ENOMEM; |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | static void destroy_inodecache(void) |
| 445 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 446 | kmem_cache_destroy(qnx4_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
| 448 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 449 | static struct dentry *qnx4_mount(struct file_system_type *fs_type, |
| 450 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 452 | return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | static struct file_system_type qnx4_fs_type = { |
| 456 | .owner = THIS_MODULE, |
| 457 | .name = "qnx4", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 458 | .mount = qnx4_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | .kill_sb = kill_block_super, |
| 460 | .fs_flags = FS_REQUIRES_DEV, |
| 461 | }; |
| 462 | |
| 463 | static int __init init_qnx4_fs(void) |
| 464 | { |
| 465 | int err; |
| 466 | |
| 467 | err = init_inodecache(); |
| 468 | if (err) |
| 469 | return err; |
| 470 | |
| 471 | err = register_filesystem(&qnx4_fs_type); |
| 472 | if (err) { |
| 473 | destroy_inodecache(); |
| 474 | return err; |
| 475 | } |
| 476 | |
Anders Larsen | 891ddb9 | 2009-09-26 20:15:09 +0200 | [diff] [blame] | 477 | printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static void __exit exit_qnx4_fs(void) |
| 482 | { |
| 483 | unregister_filesystem(&qnx4_fs_type); |
| 484 | destroy_inodecache(); |
| 485 | } |
| 486 | |
| 487 | module_init(init_qnx4_fs) |
| 488 | module_exit(exit_qnx4_fs) |
| 489 | MODULE_LICENSE("GPL"); |
| 490 | |