11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * QNX4 file system, Linux implementation. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Version : 0.2.1 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Using parts of the xiafs filesystem. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * History : 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * 01-06-1998 by Richard Frowijn : first release. 111da177e4SLinus Torvalds * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc. 121da177e4SLinus Torvalds * 30-06-1998 by Frank Denis : first step to write inodes. 131da177e4SLinus Torvalds */ 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds #include <linux/module.h> 161da177e4SLinus Torvalds #include <linux/init.h> 17964f5369SAl Viro #include <linux/slab.h> 181da177e4SLinus Torvalds #include <linux/highuid.h> 191da177e4SLinus Torvalds #include <linux/pagemap.h> 201da177e4SLinus Torvalds #include <linux/buffer_head.h> 2179d25767SAl Viro #include <linux/writeback.h> 22964f5369SAl Viro #include <linux/statfs.h> 23964f5369SAl Viro #include "qnx4.h" 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #define QNX4_VERSION 4 261da177e4SLinus Torvalds #define QNX4_BMNAME ".bitmap" 271da177e4SLinus Torvalds 28ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations qnx4_sops; 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds static void qnx4_put_super(struct super_block *sb); 311da177e4SLinus Torvalds static struct inode *qnx4_alloc_inode(struct super_block *sb); 321da177e4SLinus Torvalds static void qnx4_destroy_inode(struct inode *inode); 331da177e4SLinus Torvalds static int qnx4_remount(struct super_block *sb, int *flags, char *data); 34726c3342SDavid Howells static int qnx4_statfs(struct dentry *, struct kstatfs *); 351da177e4SLinus Torvalds 36ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations qnx4_sops = 371da177e4SLinus Torvalds { 381da177e4SLinus Torvalds .alloc_inode = qnx4_alloc_inode, 391da177e4SLinus Torvalds .destroy_inode = qnx4_destroy_inode, 401da177e4SLinus Torvalds .put_super = qnx4_put_super, 411da177e4SLinus Torvalds .statfs = qnx4_statfs, 421da177e4SLinus Torvalds .remount_fs = qnx4_remount, 431da177e4SLinus Torvalds }; 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds static int qnx4_remount(struct super_block *sb, int *flags, char *data) 461da177e4SLinus Torvalds { 471da177e4SLinus Torvalds struct qnx4_sb_info *qs; 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds qs = qnx4_sb(sb); 501da177e4SLinus Torvalds qs->Version = QNX4_VERSION; 511da177e4SLinus Torvalds *flags |= MS_RDONLY; 521da177e4SLinus Torvalds return 0; 531da177e4SLinus Torvalds } 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create ) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds unsigned long phys; 581da177e4SLinus Torvalds 59891ddb95SAnders Larsen QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock)); 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds phys = qnx4_block_map( inode, iblock ); 621da177e4SLinus Torvalds if ( phys ) { 631da177e4SLinus Torvalds // logical block is before EOF 641da177e4SLinus Torvalds map_bh(bh, inode->i_sb, phys); 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds return 0; 671da177e4SLinus Torvalds } 681da177e4SLinus Torvalds 697cd916f6SAl Viro static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset) 707cd916f6SAl Viro { 717cd916f6SAl Viro u32 size = le32_to_cpu(extent->xtnt_size); 727cd916f6SAl Viro if (*offset < size) 737cd916f6SAl Viro return le32_to_cpu(extent->xtnt_blk) + *offset - 1; 747cd916f6SAl Viro *offset -= size; 757cd916f6SAl Viro return 0; 767cd916f6SAl Viro } 777cd916f6SAl Viro 781da177e4SLinus Torvalds unsigned long qnx4_block_map( struct inode *inode, long iblock ) 791da177e4SLinus Torvalds { 801da177e4SLinus Torvalds int ix; 817cd916f6SAl Viro long i_xblk; 821da177e4SLinus Torvalds struct buffer_head *bh = NULL; 831da177e4SLinus Torvalds struct qnx4_xblk *xblk = NULL; 841da177e4SLinus Torvalds struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode); 8575043cb5SAlexey Dobriyan u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts); 867cd916f6SAl Viro u32 offset = iblock; 877cd916f6SAl Viro u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset); 881da177e4SLinus Torvalds 897cd916f6SAl Viro if (block) { 901da177e4SLinus Torvalds // iblock is in the first extent. This is easy. 911da177e4SLinus Torvalds } else { 921da177e4SLinus Torvalds // iblock is beyond first extent. We have to follow the extent chain. 931da177e4SLinus Torvalds i_xblk = le32_to_cpu(qnx4_inode->di_xblk); 941da177e4SLinus Torvalds ix = 0; 951da177e4SLinus Torvalds while ( --nxtnt > 0 ) { 961da177e4SLinus Torvalds if ( ix == 0 ) { 971da177e4SLinus Torvalds // read next xtnt block. 981da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, i_xblk - 1); 991da177e4SLinus Torvalds if ( !bh ) { 100891ddb95SAnders Larsen QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1)); 1011da177e4SLinus Torvalds return -EIO; 1021da177e4SLinus Torvalds } 1031da177e4SLinus Torvalds xblk = (struct qnx4_xblk*)bh->b_data; 1041da177e4SLinus Torvalds if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) { 105891ddb95SAnders Larsen QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk)); 1061da177e4SLinus Torvalds return -EIO; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds } 1097cd916f6SAl Viro block = try_extent(&xblk->xblk_xtnts[ix], &offset); 1107cd916f6SAl Viro if (block) { 1111da177e4SLinus Torvalds // got it! 1121da177e4SLinus Torvalds break; 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds if ( ++ix >= xblk->xblk_num_xtnts ) { 1151da177e4SLinus Torvalds i_xblk = le32_to_cpu(xblk->xblk_next_xblk); 1161da177e4SLinus Torvalds ix = 0; 1171da177e4SLinus Torvalds brelse( bh ); 1181da177e4SLinus Torvalds bh = NULL; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds if ( bh ) 1221da177e4SLinus Torvalds brelse( bh ); 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 125891ddb95SAnders Larsen QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block)); 1261da177e4SLinus Torvalds return block; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 129726c3342SDavid Howells static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf) 1301da177e4SLinus Torvalds { 131726c3342SDavid Howells struct super_block *sb = dentry->d_sb; 1325b76dc06SColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 133726c3342SDavid Howells 1341da177e4SLinus Torvalds buf->f_type = sb->s_magic; 1351da177e4SLinus Torvalds buf->f_bsize = sb->s_blocksize; 1361da177e4SLinus Torvalds buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8; 1371da177e4SLinus Torvalds buf->f_bfree = qnx4_count_free_blocks(sb); 1381da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree; 1391da177e4SLinus Torvalds buf->f_namelen = QNX4_NAME_MAX; 1405b76dc06SColy Li buf->f_fsid.val[0] = (u32)id; 1415b76dc06SColy Li buf->f_fsid.val[1] = (u32)(id >> 32); 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds return 0; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* 1471da177e4SLinus Torvalds * Check the root directory of the filesystem to make sure 1481da177e4SLinus Torvalds * it really _is_ a qnx4 filesystem, and to check the size 1491da177e4SLinus Torvalds * of the directory entry. 1501da177e4SLinus Torvalds */ 1511da177e4SLinus Torvalds static const char *qnx4_checkroot(struct super_block *sb) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds struct buffer_head *bh; 1541da177e4SLinus Torvalds struct qnx4_inode_entry *rootdir; 1551da177e4SLinus Torvalds int rd, rl; 1561da177e4SLinus Torvalds int i, j; 1571da177e4SLinus Torvalds 1584134bf81SAl Viro if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') 1591da177e4SLinus Torvalds return "no qnx4 filesystem (no root dir)."; 160891ddb95SAnders Larsen QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id)); 1611da177e4SLinus Torvalds rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1; 1621da177e4SLinus Torvalds rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size); 1631da177e4SLinus Torvalds for (j = 0; j < rl; j++) { 1641da177e4SLinus Torvalds bh = sb_bread(sb, rd + j); /* root dir, first block */ 1654134bf81SAl Viro if (bh == NULL) 1661da177e4SLinus Torvalds return "unable to read root entry."; 1674134bf81SAl Viro rootdir = (struct qnx4_inode_entry *) bh->b_data; 1684134bf81SAl Viro for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) { 169891ddb95SAnders Larsen QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname)); 1704134bf81SAl Viro if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0) 1714134bf81SAl Viro continue; 17267c50a7eSThomas Meyer qnx4_sb(sb)->BitMap = kmemdup(rootdir, 17367c50a7eSThomas Meyer sizeof(struct qnx4_inode_entry), 17467c50a7eSThomas Meyer GFP_KERNEL); 1751da177e4SLinus Torvalds brelse(bh); 1764134bf81SAl Viro if (!qnx4_sb(sb)->BitMap) 1771da177e4SLinus Torvalds return "not enough memory for bitmap inode"; 1784134bf81SAl Viro /* keep bitmap inode known */ 1794134bf81SAl Viro return NULL; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds brelse(bh); 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds return "bitmap file not found."; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds static int qnx4_fill_super(struct super_block *s, void *data, int silent) 1871da177e4SLinus Torvalds { 1881da177e4SLinus Torvalds struct buffer_head *bh; 1891da177e4SLinus Torvalds struct inode *root; 1901da177e4SLinus Torvalds const char *errmsg; 1911da177e4SLinus Torvalds struct qnx4_sb_info *qs; 1922b7e5bcbSDavid Howells int ret = -EINVAL; 1931da177e4SLinus Torvalds 194f8314dc6SPanagiotis Issaris qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL); 195073c2141SArnd Bergmann if (!qs) 1961da177e4SLinus Torvalds return -ENOMEM; 1971da177e4SLinus Torvalds s->s_fs_info = qs; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds sb_set_blocksize(s, QNX4_BLOCK_SIZE); 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds /* Check the superblock signature. Since the qnx4 code is 2021da177e4SLinus Torvalds dangerous, we should leave as quickly as possible 2031da177e4SLinus Torvalds if we don't belong here... */ 2041da177e4SLinus Torvalds bh = sb_bread(s, 1); 2051da177e4SLinus Torvalds if (!bh) { 206891ddb95SAnders Larsen printk(KERN_ERR "qnx4: unable to read the superblock\n"); 2071da177e4SLinus Torvalds goto outnobh; 2081da177e4SLinus Torvalds } 20975043cb5SAlexey Dobriyan if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) { 2101da177e4SLinus Torvalds if (!silent) 211891ddb95SAnders Larsen printk(KERN_ERR "qnx4: wrong fsid in superblock.\n"); 2121da177e4SLinus Torvalds goto out; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds s->s_op = &qnx4_sops; 2151da177e4SLinus Torvalds s->s_magic = QNX4_SUPER_MAGIC; 2161da177e4SLinus Torvalds s->s_flags |= MS_RDONLY; /* Yup, read-only yet */ 2171da177e4SLinus Torvalds qnx4_sb(s)->sb_buf = bh; 2181da177e4SLinus Torvalds qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds /* check before allocating dentries, inodes, .. */ 2221da177e4SLinus Torvalds errmsg = qnx4_checkroot(s); 2231da177e4SLinus Torvalds if (errmsg != NULL) { 2241da177e4SLinus Torvalds if (!silent) 225891ddb95SAnders Larsen printk(KERN_ERR "qnx4: %s\n", errmsg); 2261da177e4SLinus Torvalds goto out; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds /* does root not have inode number QNX4_ROOT_INO ?? */ 2302b7e5bcbSDavid Howells root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK); 2312b7e5bcbSDavid Howells if (IS_ERR(root)) { 232891ddb95SAnders Larsen printk(KERN_ERR "qnx4: get inode failed\n"); 2332b7e5bcbSDavid Howells ret = PTR_ERR(root); 2348bc5191bSAl Viro goto outb; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2372b7e5bcbSDavid Howells ret = -ENOMEM; 23848fde701SAl Viro s->s_root = d_make_root(root); 2391da177e4SLinus Torvalds if (s->s_root == NULL) 24048fde701SAl Viro goto outb; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds brelse(bh); 2431da177e4SLinus Torvalds return 0; 2441da177e4SLinus Torvalds 2458bc5191bSAl Viro outb: 2468bc5191bSAl Viro kfree(qs->BitMap); 2471da177e4SLinus Torvalds out: 2481da177e4SLinus Torvalds brelse(bh); 2491da177e4SLinus Torvalds outnobh: 2501da177e4SLinus Torvalds kfree(qs); 2511da177e4SLinus Torvalds s->s_fs_info = NULL; 2522b7e5bcbSDavid Howells return ret; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds static void qnx4_put_super(struct super_block *sb) 2561da177e4SLinus Torvalds { 2571da177e4SLinus Torvalds struct qnx4_sb_info *qs = qnx4_sb(sb); 2581da177e4SLinus Torvalds kfree( qs->BitMap ); 2591da177e4SLinus Torvalds kfree( qs ); 2601da177e4SLinus Torvalds sb->s_fs_info = NULL; 2611da177e4SLinus Torvalds return; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds static int qnx4_readpage(struct file *file, struct page *page) 2651da177e4SLinus Torvalds { 2661da177e4SLinus Torvalds return block_read_full_page(page,qnx4_get_block); 2671da177e4SLinus Torvalds } 268f8706184SNick Piggin 2691da177e4SLinus Torvalds static sector_t qnx4_bmap(struct address_space *mapping, sector_t block) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds return generic_block_bmap(mapping,block,qnx4_get_block); 2721da177e4SLinus Torvalds } 273f5e54d6eSChristoph Hellwig static const struct address_space_operations qnx4_aops = { 2741da177e4SLinus Torvalds .readpage = qnx4_readpage, 2751da177e4SLinus Torvalds .bmap = qnx4_bmap 2761da177e4SLinus Torvalds }; 2771da177e4SLinus Torvalds 2782b7e5bcbSDavid Howells struct inode *qnx4_iget(struct super_block *sb, unsigned long ino) 2791da177e4SLinus Torvalds { 2801da177e4SLinus Torvalds struct buffer_head *bh; 2811da177e4SLinus Torvalds struct qnx4_inode_entry *raw_inode; 2822b7e5bcbSDavid Howells int block; 2832b7e5bcbSDavid Howells struct qnx4_inode_entry *qnx4_inode; 2842b7e5bcbSDavid Howells struct inode *inode; 2851da177e4SLinus Torvalds 2862b7e5bcbSDavid Howells inode = iget_locked(sb, ino); 2872b7e5bcbSDavid Howells if (!inode) 2882b7e5bcbSDavid Howells return ERR_PTR(-ENOMEM); 2892b7e5bcbSDavid Howells if (!(inode->i_state & I_NEW)) 2902b7e5bcbSDavid Howells return inode; 2912b7e5bcbSDavid Howells 2922b7e5bcbSDavid Howells qnx4_inode = qnx4_raw_inode(inode); 2931da177e4SLinus Torvalds inode->i_mode = 0; 2941da177e4SLinus Torvalds 295891ddb95SAnders Larsen QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino)); 2961da177e4SLinus Torvalds if (!ino) { 2972b7e5bcbSDavid Howells printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is " 2982b7e5bcbSDavid Howells "out of range\n", 2991da177e4SLinus Torvalds sb->s_id, ino); 3002b7e5bcbSDavid Howells iget_failed(inode); 3012b7e5bcbSDavid Howells return ERR_PTR(-EIO); 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds block = ino / QNX4_INODES_PER_BLOCK; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds if (!(bh = sb_bread(sb, block))) { 306891ddb95SAnders Larsen printk(KERN_ERR "qnx4: major problem: unable to read inode from dev " 3071da177e4SLinus Torvalds "%s\n", sb->s_id); 3082b7e5bcbSDavid Howells iget_failed(inode); 3092b7e5bcbSDavid Howells return ERR_PTR(-EIO); 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds raw_inode = ((struct qnx4_inode_entry *) bh->b_data) + 3121da177e4SLinus Torvalds (ino % QNX4_INODES_PER_BLOCK); 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds inode->i_mode = le16_to_cpu(raw_inode->di_mode); 315511728d7SEric W. Biederman i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid)); 316511728d7SEric W. Biederman i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid)); 317bfe86848SMiklos Szeredi set_nlink(inode, le16_to_cpu(raw_inode->di_nlink)); 3181da177e4SLinus Torvalds inode->i_size = le32_to_cpu(raw_inode->di_size); 3191da177e4SLinus Torvalds inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime); 3201da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; 3211da177e4SLinus Torvalds inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime); 3221da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0; 3231da177e4SLinus Torvalds inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime); 3241da177e4SLinus Torvalds inode->i_ctime.tv_nsec = 0; 3251da177e4SLinus Torvalds inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size); 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE); 3281da177e4SLinus Torvalds if (S_ISREG(inode->i_mode)) { 329945ffe54SChristoph Hellwig inode->i_fop = &generic_ro_fops; 3301da177e4SLinus Torvalds inode->i_mapping->a_ops = &qnx4_aops; 3311da177e4SLinus Torvalds qnx4_i(inode)->mmu_private = inode->i_size; 3321da177e4SLinus Torvalds } else if (S_ISDIR(inode->i_mode)) { 3331da177e4SLinus Torvalds inode->i_op = &qnx4_dir_inode_operations; 3341da177e4SLinus Torvalds inode->i_fop = &qnx4_dir_operations; 3351da177e4SLinus Torvalds } else if (S_ISLNK(inode->i_mode)) { 3361da177e4SLinus Torvalds inode->i_op = &page_symlink_inode_operations; 3371da177e4SLinus Torvalds inode->i_mapping->a_ops = &qnx4_aops; 3381da177e4SLinus Torvalds qnx4_i(inode)->mmu_private = inode->i_size; 3392b7e5bcbSDavid Howells } else { 3402b7e5bcbSDavid Howells printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n", 3412b7e5bcbSDavid Howells ino, sb->s_id); 3422b7e5bcbSDavid Howells iget_failed(inode); 3431da177e4SLinus Torvalds brelse(bh); 3442b7e5bcbSDavid Howells return ERR_PTR(-EIO); 3452b7e5bcbSDavid Howells } 3462b7e5bcbSDavid Howells brelse(bh); 3472b7e5bcbSDavid Howells unlock_new_inode(inode); 3482b7e5bcbSDavid Howells return inode; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 351e18b890bSChristoph Lameter static struct kmem_cache *qnx4_inode_cachep; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds static struct inode *qnx4_alloc_inode(struct super_block *sb) 3541da177e4SLinus Torvalds { 3551da177e4SLinus Torvalds struct qnx4_inode_info *ei; 356e94b1766SChristoph Lameter ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL); 3571da177e4SLinus Torvalds if (!ei) 3581da177e4SLinus Torvalds return NULL; 3591da177e4SLinus Torvalds return &ei->vfs_inode; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 362fa0d7e3dSNick Piggin static void qnx4_i_callback(struct rcu_head *head) 363fa0d7e3dSNick Piggin { 364fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 365fa0d7e3dSNick Piggin kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode)); 366fa0d7e3dSNick Piggin } 367fa0d7e3dSNick Piggin 3681da177e4SLinus Torvalds static void qnx4_destroy_inode(struct inode *inode) 3691da177e4SLinus Torvalds { 370fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, qnx4_i_callback); 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 37351cc5068SAlexey Dobriyan static void init_once(void *foo) 3741da177e4SLinus Torvalds { 3751da177e4SLinus Torvalds struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds static int init_inodecache(void) 3811da177e4SLinus Torvalds { 3821da177e4SLinus Torvalds qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache", 3831da177e4SLinus Torvalds sizeof(struct qnx4_inode_info), 384fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 385fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 38620c2df83SPaul Mundt init_once); 3871da177e4SLinus Torvalds if (qnx4_inode_cachep == NULL) 3881da177e4SLinus Torvalds return -ENOMEM; 3891da177e4SLinus Torvalds return 0; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds static void destroy_inodecache(void) 3931da177e4SLinus Torvalds { 3941a1d92c1SAlexey Dobriyan kmem_cache_destroy(qnx4_inode_cachep); 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds 397152a0836SAl Viro static struct dentry *qnx4_mount(struct file_system_type *fs_type, 398152a0836SAl Viro int flags, const char *dev_name, void *data) 3991da177e4SLinus Torvalds { 400152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super); 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds static struct file_system_type qnx4_fs_type = { 4041da177e4SLinus Torvalds .owner = THIS_MODULE, 4051da177e4SLinus Torvalds .name = "qnx4", 406152a0836SAl Viro .mount = qnx4_mount, 4071da177e4SLinus Torvalds .kill_sb = kill_block_super, 4081da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4091da177e4SLinus Torvalds }; 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds static int __init init_qnx4_fs(void) 4121da177e4SLinus Torvalds { 4131da177e4SLinus Torvalds int err; 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds err = init_inodecache(); 4161da177e4SLinus Torvalds if (err) 4171da177e4SLinus Torvalds return err; 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds err = register_filesystem(&qnx4_fs_type); 4201da177e4SLinus Torvalds if (err) { 4211da177e4SLinus Torvalds destroy_inodecache(); 4221da177e4SLinus Torvalds return err; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 425891ddb95SAnders Larsen printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n"); 4261da177e4SLinus Torvalds return 0; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds static void __exit exit_qnx4_fs(void) 4301da177e4SLinus Torvalds { 4311da177e4SLinus Torvalds unregister_filesystem(&qnx4_fs_type); 4321da177e4SLinus Torvalds destroy_inodecache(); 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds module_init(init_qnx4_fs) 4361da177e4SLinus Torvalds module_exit(exit_qnx4_fs) 4371da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 4381da177e4SLinus Torvalds 439