11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/hfs/super.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1995-1997 Paul H. Hargrove 51da177e4SLinus Torvalds * (C) 2003 Ardis Technologies <roman@ardistech.com> 61da177e4SLinus Torvalds * This file may be distributed under the terms of the GNU General Public License. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * This file contains hfs_read_super(), some of the super_ops and 914b30d62SRobert P. J. Day * init_hfs_fs() and exit_hfs_fs(). The remaining super_ops are in 101da177e4SLinus Torvalds * inode.c since they deal with inodes. 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds 131da177e4SLinus Torvalds */ 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds #include <linux/module.h> 161da177e4SLinus Torvalds #include <linux/blkdev.h> 17717dd80eSRoman Zippel #include <linux/mount.h> 181da177e4SLinus Torvalds #include <linux/init.h> 19328b9227SRoman Zippel #include <linux/nls.h> 201da177e4SLinus Torvalds #include <linux/parser.h> 21717dd80eSRoman Zippel #include <linux/seq_file.h> 225a0e3ad6STejun Heo #include <linux/slab.h> 231da177e4SLinus Torvalds #include <linux/vfs.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include "hfs_fs.h" 261da177e4SLinus Torvalds #include "btree.h" 271da177e4SLinus Torvalds 28e18b890bSChristoph Lameter static struct kmem_cache *hfs_inode_cachep; 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds /* 331da177e4SLinus Torvalds * hfs_write_super() 341da177e4SLinus Torvalds * 351da177e4SLinus Torvalds * Description: 361da177e4SLinus Torvalds * This function is called by the VFS only. When the filesystem 371da177e4SLinus Torvalds * is mounted r/w it updates the MDB on disk. 381da177e4SLinus Torvalds * Input Variable(s): 391da177e4SLinus Torvalds * struct super_block *sb: Pointer to the hfs superblock 401da177e4SLinus Torvalds * Output Variable(s): 411da177e4SLinus Torvalds * NONE 421da177e4SLinus Torvalds * Returns: 431da177e4SLinus Torvalds * void 441da177e4SLinus Torvalds * Preconditions: 451da177e4SLinus Torvalds * 'sb' points to a "valid" (struct super_block). 461da177e4SLinus Torvalds * Postconditions: 471da177e4SLinus Torvalds * The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb 481da177e4SLinus Torvalds * (hfs_put_super() must set this flag!). Some MDB fields are updated 491da177e4SLinus Torvalds * and the MDB buffer is written to disk by calling hfs_mdb_commit(). 501da177e4SLinus Torvalds */ 511da177e4SLinus Torvalds static void hfs_write_super(struct super_block *sb) 521da177e4SLinus Torvalds { 531da177e4SLinus Torvalds sb->s_dirt = 0; 54ebc1ac16SChristoph Hellwig 551da177e4SLinus Torvalds /* sync everything to the buffers */ 561da177e4SLinus Torvalds hfs_mdb_commit(sb); 571da177e4SLinus Torvalds } 581da177e4SLinus Torvalds 5958bc5bbbSChristoph Hellwig static int hfs_sync_fs(struct super_block *sb, int wait) 6058bc5bbbSChristoph Hellwig { 6158bc5bbbSChristoph Hellwig hfs_mdb_commit(sb); 6258bc5bbbSChristoph Hellwig sb->s_dirt = 0; 6358bc5bbbSChristoph Hellwig 6458bc5bbbSChristoph Hellwig return 0; 6558bc5bbbSChristoph Hellwig } 6658bc5bbbSChristoph Hellwig 671da177e4SLinus Torvalds /* 681da177e4SLinus Torvalds * hfs_put_super() 691da177e4SLinus Torvalds * 701da177e4SLinus Torvalds * This is the put_super() entry in the super_operations structure for 711da177e4SLinus Torvalds * HFS filesystems. The purpose is to release the resources 721da177e4SLinus Torvalds * associated with the superblock sb. 731da177e4SLinus Torvalds */ 741da177e4SLinus Torvalds static void hfs_put_super(struct super_block *sb) 751da177e4SLinus Torvalds { 761da177e4SLinus Torvalds hfs_mdb_close(sb); 771da177e4SLinus Torvalds /* release the MDB's resources */ 781da177e4SLinus Torvalds hfs_mdb_put(sb); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* 821da177e4SLinus Torvalds * hfs_statfs() 831da177e4SLinus Torvalds * 841da177e4SLinus Torvalds * This is the statfs() entry in the super_operations structure for 851da177e4SLinus Torvalds * HFS filesystems. The purpose is to return various data about the 861da177e4SLinus Torvalds * filesystem. 871da177e4SLinus Torvalds * 881da177e4SLinus Torvalds * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks. 891da177e4SLinus Torvalds */ 90726c3342SDavid Howells static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf) 911da177e4SLinus Torvalds { 92726c3342SDavid Howells struct super_block *sb = dentry->d_sb; 937dd2c000SColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 94726c3342SDavid Howells 951da177e4SLinus Torvalds buf->f_type = HFS_SUPER_MAGIC; 961da177e4SLinus Torvalds buf->f_bsize = sb->s_blocksize; 971da177e4SLinus Torvalds buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div; 981da177e4SLinus Torvalds buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div; 991da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree; 1001da177e4SLinus Torvalds buf->f_files = HFS_SB(sb)->fs_ablocks; 1011da177e4SLinus Torvalds buf->f_ffree = HFS_SB(sb)->free_ablocks; 1027dd2c000SColy Li buf->f_fsid.val[0] = (u32)id; 1037dd2c000SColy Li buf->f_fsid.val[1] = (u32)(id >> 32); 1041da177e4SLinus Torvalds buf->f_namelen = HFS_NAMELEN; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds return 0; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds static int hfs_remount(struct super_block *sb, int *flags, char *data) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds *flags |= MS_NODIRATIME; 1121da177e4SLinus Torvalds if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1131da177e4SLinus Torvalds return 0; 1141da177e4SLinus Torvalds if (!(*flags & MS_RDONLY)) { 1151da177e4SLinus Torvalds if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) { 1167cf3cc30SRoman Zippel printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, " 1171da177e4SLinus Torvalds "running fsck.hfs is recommended. leaving read-only.\n"); 1181da177e4SLinus Torvalds sb->s_flags |= MS_RDONLY; 1191da177e4SLinus Torvalds *flags |= MS_RDONLY; 1201da177e4SLinus Torvalds } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) { 1217cf3cc30SRoman Zippel printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n"); 1221da177e4SLinus Torvalds sb->s_flags |= MS_RDONLY; 1231da177e4SLinus Torvalds *flags |= MS_RDONLY; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds return 0; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 12934c80b1dSAl Viro static int hfs_show_options(struct seq_file *seq, struct dentry *root) 130717dd80eSRoman Zippel { 13134c80b1dSAl Viro struct hfs_sb_info *sbi = HFS_SB(root->d_sb); 132717dd80eSRoman Zippel 133717dd80eSRoman Zippel if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f)) 134717dd80eSRoman Zippel seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator); 135717dd80eSRoman Zippel if (sbi->s_type != cpu_to_be32(0x3f3f3f3f)) 136717dd80eSRoman Zippel seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type); 137717dd80eSRoman Zippel seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid); 138717dd80eSRoman Zippel if (sbi->s_file_umask != 0133) 139717dd80eSRoman Zippel seq_printf(seq, ",file_umask=%o", sbi->s_file_umask); 140717dd80eSRoman Zippel if (sbi->s_dir_umask != 0022) 141717dd80eSRoman Zippel seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask); 142717dd80eSRoman Zippel if (sbi->part >= 0) 143717dd80eSRoman Zippel seq_printf(seq, ",part=%u", sbi->part); 144717dd80eSRoman Zippel if (sbi->session >= 0) 145717dd80eSRoman Zippel seq_printf(seq, ",session=%u", sbi->session); 146328b9227SRoman Zippel if (sbi->nls_disk) 147328b9227SRoman Zippel seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset); 148328b9227SRoman Zippel if (sbi->nls_io) 149328b9227SRoman Zippel seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset); 150717dd80eSRoman Zippel if (sbi->s_quiet) 151717dd80eSRoman Zippel seq_printf(seq, ",quiet"); 152717dd80eSRoman Zippel return 0; 153717dd80eSRoman Zippel } 154717dd80eSRoman Zippel 1551da177e4SLinus Torvalds static struct inode *hfs_alloc_inode(struct super_block *sb) 1561da177e4SLinus Torvalds { 1571da177e4SLinus Torvalds struct hfs_inode_info *i; 1581da177e4SLinus Torvalds 159e94b1766SChristoph Lameter i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL); 1601da177e4SLinus Torvalds return i ? &i->vfs_inode : NULL; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 163fa0d7e3dSNick Piggin static void hfs_i_callback(struct rcu_head *head) 164fa0d7e3dSNick Piggin { 165fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 166fa0d7e3dSNick Piggin kmem_cache_free(hfs_inode_cachep, HFS_I(inode)); 167fa0d7e3dSNick Piggin } 168fa0d7e3dSNick Piggin 1691da177e4SLinus Torvalds static void hfs_destroy_inode(struct inode *inode) 1701da177e4SLinus Torvalds { 171fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, hfs_i_callback); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 174ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hfs_super_operations = { 1751da177e4SLinus Torvalds .alloc_inode = hfs_alloc_inode, 1761da177e4SLinus Torvalds .destroy_inode = hfs_destroy_inode, 1771da177e4SLinus Torvalds .write_inode = hfs_write_inode, 178b57922d9SAl Viro .evict_inode = hfs_evict_inode, 1791da177e4SLinus Torvalds .put_super = hfs_put_super, 1801da177e4SLinus Torvalds .write_super = hfs_write_super, 18158bc5bbbSChristoph Hellwig .sync_fs = hfs_sync_fs, 1821da177e4SLinus Torvalds .statfs = hfs_statfs, 1831da177e4SLinus Torvalds .remount_fs = hfs_remount, 184717dd80eSRoman Zippel .show_options = hfs_show_options, 1851da177e4SLinus Torvalds }; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds enum { 1881da177e4SLinus Torvalds opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask, 1891da177e4SLinus Torvalds opt_part, opt_session, opt_type, opt_creator, opt_quiet, 190328b9227SRoman Zippel opt_codepage, opt_iocharset, 1911da177e4SLinus Torvalds opt_err 1921da177e4SLinus Torvalds }; 1931da177e4SLinus Torvalds 194a447c093SSteven Whitehouse static const match_table_t tokens = { 1951da177e4SLinus Torvalds { opt_uid, "uid=%u" }, 1961da177e4SLinus Torvalds { opt_gid, "gid=%u" }, 1971da177e4SLinus Torvalds { opt_umask, "umask=%o" }, 1981da177e4SLinus Torvalds { opt_file_umask, "file_umask=%o" }, 1991da177e4SLinus Torvalds { opt_dir_umask, "dir_umask=%o" }, 2001da177e4SLinus Torvalds { opt_part, "part=%u" }, 2011da177e4SLinus Torvalds { opt_session, "session=%u" }, 2021da177e4SLinus Torvalds { opt_type, "type=%s" }, 2031da177e4SLinus Torvalds { opt_creator, "creator=%s" }, 2041da177e4SLinus Torvalds { opt_quiet, "quiet" }, 205328b9227SRoman Zippel { opt_codepage, "codepage=%s" }, 206328b9227SRoman Zippel { opt_iocharset, "iocharset=%s" }, 2071da177e4SLinus Torvalds { opt_err, NULL } 2081da177e4SLinus Torvalds }; 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds static inline int match_fourchar(substring_t *arg, u32 *result) 2111da177e4SLinus Torvalds { 2121da177e4SLinus Torvalds if (arg->to - arg->from != 4) 2131da177e4SLinus Torvalds return -EINVAL; 2141da177e4SLinus Torvalds memcpy(result, arg->from, 4); 2151da177e4SLinus Torvalds return 0; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds /* 2191da177e4SLinus Torvalds * parse_options() 2201da177e4SLinus Torvalds * 2211da177e4SLinus Torvalds * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger 2221da177e4SLinus Torvalds * This function is called by hfs_read_super() to parse the mount options. 2231da177e4SLinus Torvalds */ 2241da177e4SLinus Torvalds static int parse_options(char *options, struct hfs_sb_info *hsb) 2251da177e4SLinus Torvalds { 2261da177e4SLinus Torvalds char *p; 2271da177e4SLinus Torvalds substring_t args[MAX_OPT_ARGS]; 2281da177e4SLinus Torvalds int tmp, token; 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds /* initialize the sb with defaults */ 23194c9a5eeSDavid Howells hsb->s_uid = current_uid(); 23294c9a5eeSDavid Howells hsb->s_gid = current_gid(); 2331da177e4SLinus Torvalds hsb->s_file_umask = 0133; 2341da177e4SLinus Torvalds hsb->s_dir_umask = 0022; 2351da177e4SLinus Torvalds hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */ 2361da177e4SLinus Torvalds hsb->s_quiet = 0; 2371da177e4SLinus Torvalds hsb->part = -1; 2381da177e4SLinus Torvalds hsb->session = -1; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds if (!options) 2411da177e4SLinus Torvalds return 1; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds while ((p = strsep(&options, ",")) != NULL) { 2441da177e4SLinus Torvalds if (!*p) 2451da177e4SLinus Torvalds continue; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds token = match_token(p, tokens, args); 2481da177e4SLinus Torvalds switch (token) { 2491da177e4SLinus Torvalds case opt_uid: 2501da177e4SLinus Torvalds if (match_int(&args[0], &tmp)) { 2517cf3cc30SRoman Zippel printk(KERN_ERR "hfs: uid requires an argument\n"); 2521da177e4SLinus Torvalds return 0; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds hsb->s_uid = (uid_t)tmp; 2551da177e4SLinus Torvalds break; 2561da177e4SLinus Torvalds case opt_gid: 2571da177e4SLinus Torvalds if (match_int(&args[0], &tmp)) { 2587cf3cc30SRoman Zippel printk(KERN_ERR "hfs: gid requires an argument\n"); 2591da177e4SLinus Torvalds return 0; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds hsb->s_gid = (gid_t)tmp; 2621da177e4SLinus Torvalds break; 2631da177e4SLinus Torvalds case opt_umask: 2641da177e4SLinus Torvalds if (match_octal(&args[0], &tmp)) { 2657cf3cc30SRoman Zippel printk(KERN_ERR "hfs: umask requires a value\n"); 2661da177e4SLinus Torvalds return 0; 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds hsb->s_file_umask = (umode_t)tmp; 2691da177e4SLinus Torvalds hsb->s_dir_umask = (umode_t)tmp; 2701da177e4SLinus Torvalds break; 2711da177e4SLinus Torvalds case opt_file_umask: 2721da177e4SLinus Torvalds if (match_octal(&args[0], &tmp)) { 2737cf3cc30SRoman Zippel printk(KERN_ERR "hfs: file_umask requires a value\n"); 2741da177e4SLinus Torvalds return 0; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds hsb->s_file_umask = (umode_t)tmp; 2771da177e4SLinus Torvalds break; 2781da177e4SLinus Torvalds case opt_dir_umask: 2791da177e4SLinus Torvalds if (match_octal(&args[0], &tmp)) { 2807cf3cc30SRoman Zippel printk(KERN_ERR "hfs: dir_umask requires a value\n"); 2811da177e4SLinus Torvalds return 0; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds hsb->s_dir_umask = (umode_t)tmp; 2841da177e4SLinus Torvalds break; 2851da177e4SLinus Torvalds case opt_part: 2861da177e4SLinus Torvalds if (match_int(&args[0], &hsb->part)) { 2877cf3cc30SRoman Zippel printk(KERN_ERR "hfs: part requires an argument\n"); 2881da177e4SLinus Torvalds return 0; 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds break; 2911da177e4SLinus Torvalds case opt_session: 2921da177e4SLinus Torvalds if (match_int(&args[0], &hsb->session)) { 2937cf3cc30SRoman Zippel printk(KERN_ERR "hfs: session requires an argument\n"); 2941da177e4SLinus Torvalds return 0; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds break; 2971da177e4SLinus Torvalds case opt_type: 2981da177e4SLinus Torvalds if (match_fourchar(&args[0], &hsb->s_type)) { 2997cf3cc30SRoman Zippel printk(KERN_ERR "hfs: type requires a 4 character value\n"); 3001da177e4SLinus Torvalds return 0; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds break; 3031da177e4SLinus Torvalds case opt_creator: 3041da177e4SLinus Torvalds if (match_fourchar(&args[0], &hsb->s_creator)) { 3057cf3cc30SRoman Zippel printk(KERN_ERR "hfs: creator requires a 4 character value\n"); 3061da177e4SLinus Torvalds return 0; 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds break; 3091da177e4SLinus Torvalds case opt_quiet: 3101da177e4SLinus Torvalds hsb->s_quiet = 1; 3111da177e4SLinus Torvalds break; 312328b9227SRoman Zippel case opt_codepage: 313328b9227SRoman Zippel if (hsb->nls_disk) { 3147cf3cc30SRoman Zippel printk(KERN_ERR "hfs: unable to change codepage\n"); 315328b9227SRoman Zippel return 0; 316328b9227SRoman Zippel } 317328b9227SRoman Zippel p = match_strdup(&args[0]); 3183fbe5c31SJim Meyering if (p) 319328b9227SRoman Zippel hsb->nls_disk = load_nls(p); 320328b9227SRoman Zippel if (!hsb->nls_disk) { 3217cf3cc30SRoman Zippel printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p); 322328b9227SRoman Zippel kfree(p); 323328b9227SRoman Zippel return 0; 324328b9227SRoman Zippel } 325328b9227SRoman Zippel kfree(p); 326328b9227SRoman Zippel break; 327328b9227SRoman Zippel case opt_iocharset: 328328b9227SRoman Zippel if (hsb->nls_io) { 3297cf3cc30SRoman Zippel printk(KERN_ERR "hfs: unable to change iocharset\n"); 330328b9227SRoman Zippel return 0; 331328b9227SRoman Zippel } 332328b9227SRoman Zippel p = match_strdup(&args[0]); 3333fbe5c31SJim Meyering if (p) 334328b9227SRoman Zippel hsb->nls_io = load_nls(p); 335328b9227SRoman Zippel if (!hsb->nls_io) { 3367cf3cc30SRoman Zippel printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p); 337328b9227SRoman Zippel kfree(p); 338328b9227SRoman Zippel return 0; 339328b9227SRoman Zippel } 340328b9227SRoman Zippel kfree(p); 341328b9227SRoman Zippel break; 3421da177e4SLinus Torvalds default: 3431da177e4SLinus Torvalds return 0; 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 347328b9227SRoman Zippel if (hsb->nls_disk && !hsb->nls_io) { 348328b9227SRoman Zippel hsb->nls_io = load_nls_default(); 349328b9227SRoman Zippel if (!hsb->nls_io) { 3507cf3cc30SRoman Zippel printk(KERN_ERR "hfs: unable to load default iocharset\n"); 351328b9227SRoman Zippel return 0; 352328b9227SRoman Zippel } 353328b9227SRoman Zippel } 3541da177e4SLinus Torvalds hsb->s_dir_umask &= 0777; 3551da177e4SLinus Torvalds hsb->s_file_umask &= 0577; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds return 1; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* 3611da177e4SLinus Torvalds * hfs_read_super() 3621da177e4SLinus Torvalds * 3631da177e4SLinus Torvalds * This is the function that is responsible for mounting an HFS 3641da177e4SLinus Torvalds * filesystem. It performs all the tasks necessary to get enough data 3651da177e4SLinus Torvalds * from the disk to read the root inode. This includes parsing the 3661da177e4SLinus Torvalds * mount options, dealing with Macintosh partitions, reading the 3671da177e4SLinus Torvalds * superblock and the allocation bitmap blocks, calling 3681da177e4SLinus Torvalds * hfs_btree_init() to get the necessary data about the extents and 3691da177e4SLinus Torvalds * catalog B-trees and, finally, reading the root inode into memory. 3701da177e4SLinus Torvalds */ 3711da177e4SLinus Torvalds static int hfs_fill_super(struct super_block *sb, void *data, int silent) 3721da177e4SLinus Torvalds { 3731da177e4SLinus Torvalds struct hfs_sb_info *sbi; 3741da177e4SLinus Torvalds struct hfs_find_data fd; 3751da177e4SLinus Torvalds hfs_cat_rec rec; 3761da177e4SLinus Torvalds struct inode *root_inode; 3771da177e4SLinus Torvalds int res; 3781da177e4SLinus Torvalds 379f8314dc6SPanagiotis Issaris sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); 3808526fb37SJan Blunck if (!sbi) 3811da177e4SLinus Torvalds return -ENOMEM; 3828526fb37SJan Blunck 383b16ca626SArtem Bityutskiy sbi->sb = sb; 3841da177e4SLinus Torvalds sb->s_fs_info = sbi; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds res = -EINVAL; 3871da177e4SLinus Torvalds if (!parse_options((char *)data, sbi)) { 3887cf3cc30SRoman Zippel printk(KERN_ERR "hfs: unable to parse mount options.\n"); 389945b0920SColin Leroy goto bail; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds sb->s_op = &hfs_super_operations; 3931da177e4SLinus Torvalds sb->s_flags |= MS_NODIRATIME; 3943084b72dSMatthias Kaehlcke mutex_init(&sbi->bitmap_lock); 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds res = hfs_mdb_get(sb); 3971da177e4SLinus Torvalds if (res) { 3981da177e4SLinus Torvalds if (!silent) 3997cf3cc30SRoman Zippel printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n", 4001da177e4SLinus Torvalds hfs_mdb_name(sb)); 4011da177e4SLinus Torvalds res = -EINVAL; 402945b0920SColin Leroy goto bail; 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* try to get the root inode */ 4061da177e4SLinus Torvalds hfs_find_init(HFS_SB(sb)->cat_tree, &fd); 4071da177e4SLinus Torvalds res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd); 408ec81aecbSAmerigo Wang if (!res) { 409ec81aecbSAmerigo Wang if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) { 410ec81aecbSAmerigo Wang res = -EIO; 411ec81aecbSAmerigo Wang goto bail; 412ec81aecbSAmerigo Wang } 4131da177e4SLinus Torvalds hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength); 414ec81aecbSAmerigo Wang } 4151da177e4SLinus Torvalds if (res) { 4161da177e4SLinus Torvalds hfs_find_exit(&fd); 4171da177e4SLinus Torvalds goto bail_no_root; 4181da177e4SLinus Torvalds } 419d6ddf554SEric Sandeen res = -EINVAL; 4201da177e4SLinus Torvalds root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); 4211da177e4SLinus Torvalds hfs_find_exit(&fd); 4221da177e4SLinus Torvalds if (!root_inode) 4231da177e4SLinus Torvalds goto bail_no_root; 4241da177e4SLinus Torvalds 425518c79d2SAl Viro sb->s_d_op = &hfs_dentry_operations; 426d6ddf554SEric Sandeen res = -ENOMEM; 42748fde701SAl Viro sb->s_root = d_make_root(root_inode); 4281da177e4SLinus Torvalds if (!sb->s_root) 42948fde701SAl Viro goto bail_no_root; 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* everything's okay */ 4321da177e4SLinus Torvalds return 0; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds bail_no_root: 4357cf3cc30SRoman Zippel printk(KERN_ERR "hfs: get root inode failed.\n"); 436945b0920SColin Leroy bail: 4371da177e4SLinus Torvalds hfs_mdb_put(sb); 4381da177e4SLinus Torvalds return res; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 441152a0836SAl Viro static struct dentry *hfs_mount(struct file_system_type *fs_type, 442152a0836SAl Viro int flags, const char *dev_name, void *data) 4431da177e4SLinus Torvalds { 444152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super); 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds static struct file_system_type hfs_fs_type = { 4481da177e4SLinus Torvalds .owner = THIS_MODULE, 4491da177e4SLinus Torvalds .name = "hfs", 450152a0836SAl Viro .mount = hfs_mount, 4511da177e4SLinus Torvalds .kill_sb = kill_block_super, 4521da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4531da177e4SLinus Torvalds }; 4541da177e4SLinus Torvalds 45551cc5068SAlexey Dobriyan static void hfs_init_once(void *p) 4561da177e4SLinus Torvalds { 4571da177e4SLinus Torvalds struct hfs_inode_info *i = p; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds inode_init_once(&i->vfs_inode); 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds static int __init init_hfs_fs(void) 4631da177e4SLinus Torvalds { 4641da177e4SLinus Torvalds int err; 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds hfs_inode_cachep = kmem_cache_create("hfs_inode_cache", 4671da177e4SLinus Torvalds sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN, 46820c2df83SPaul Mundt hfs_init_once); 4691da177e4SLinus Torvalds if (!hfs_inode_cachep) 4701da177e4SLinus Torvalds return -ENOMEM; 4711da177e4SLinus Torvalds err = register_filesystem(&hfs_fs_type); 4721da177e4SLinus Torvalds if (err) 4731da177e4SLinus Torvalds kmem_cache_destroy(hfs_inode_cachep); 4741da177e4SLinus Torvalds return err; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds static void __exit exit_hfs_fs(void) 4781da177e4SLinus Torvalds { 4791da177e4SLinus Torvalds unregister_filesystem(&hfs_fs_type); 4801a1d92c1SAlexey Dobriyan kmem_cache_destroy(hfs_inode_cachep); 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds module_init(init_hfs_fs) 4841da177e4SLinus Torvalds module_exit(exit_hfs_fs) 485