11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/befs/linuxvfs.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #include <linux/module.h> 91da177e4SLinus Torvalds #include <linux/slab.h> 101da177e4SLinus Torvalds #include <linux/fs.h> 111da177e4SLinus Torvalds #include <linux/errno.h> 121da177e4SLinus Torvalds #include <linux/stat.h> 131da177e4SLinus Torvalds #include <linux/nls.h> 141da177e4SLinus Torvalds #include <linux/buffer_head.h> 151da177e4SLinus Torvalds #include <linux/vfs.h> 161da177e4SLinus Torvalds #include <linux/parser.h> 171da177e4SLinus Torvalds #include <linux/namei.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include "befs.h" 201da177e4SLinus Torvalds #include "btree.h" 211da177e4SLinus Torvalds #include "inode.h" 221da177e4SLinus Torvalds #include "datastream.h" 231da177e4SLinus Torvalds #include "super.h" 241da177e4SLinus Torvalds #include "io.h" 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); 271da177e4SLinus Torvalds MODULE_AUTHOR("Will Dyson"); 281da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds /* The units the vfs expects inode->i_blocks to be in */ 311da177e4SLinus Torvalds #define VFS_BLOCK_SIZE 512 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds static int befs_readdir(struct file *, void *, filldir_t); 341da177e4SLinus Torvalds static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); 351da177e4SLinus Torvalds static int befs_readpage(struct file *file, struct page *page); 361da177e4SLinus Torvalds static sector_t befs_bmap(struct address_space *mapping, sector_t block); 371da177e4SLinus Torvalds static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *); 381da177e4SLinus Torvalds static void befs_read_inode(struct inode *ino); 391da177e4SLinus Torvalds static struct inode *befs_alloc_inode(struct super_block *sb); 401da177e4SLinus Torvalds static void befs_destroy_inode(struct inode *inode); 411da177e4SLinus Torvalds static int befs_init_inodecache(void); 421da177e4SLinus Torvalds static void befs_destroy_inodecache(void); 43008b150aSAl Viro static void *befs_follow_link(struct dentry *, struct nameidata *); 44008b150aSAl Viro static void befs_put_link(struct dentry *, struct nameidata *, void *); 451da177e4SLinus Torvalds static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, 461da177e4SLinus Torvalds char **out, int *out_len); 471da177e4SLinus Torvalds static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, 481da177e4SLinus Torvalds char **out, int *out_len); 491da177e4SLinus Torvalds static void befs_put_super(struct super_block *); 501da177e4SLinus Torvalds static int befs_remount(struct super_block *, int *, char *); 51726c3342SDavid Howells static int befs_statfs(struct dentry *, struct kstatfs *); 521da177e4SLinus Torvalds static int parse_options(char *, befs_mount_options *); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static const struct super_operations befs_sops = { 551da177e4SLinus Torvalds .read_inode = befs_read_inode, /* initialize & read inode */ 561da177e4SLinus Torvalds .alloc_inode = befs_alloc_inode, /* allocate a new inode */ 571da177e4SLinus Torvalds .destroy_inode = befs_destroy_inode, /* deallocate an inode */ 581da177e4SLinus Torvalds .put_super = befs_put_super, /* uninit super */ 591da177e4SLinus Torvalds .statfs = befs_statfs, /* statfs */ 601da177e4SLinus Torvalds .remount_fs = befs_remount, 611da177e4SLinus Torvalds }; 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds /* slab cache for befs_inode_info objects */ 64e18b890bSChristoph Lameter static struct kmem_cache *befs_inode_cachep; 651da177e4SLinus Torvalds 664b6f5d20SArjan van de Ven static const struct file_operations befs_dir_operations = { 671da177e4SLinus Torvalds .read = generic_read_dir, 681da177e4SLinus Torvalds .readdir = befs_readdir, 691da177e4SLinus Torvalds }; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds static struct inode_operations befs_dir_inode_operations = { 721da177e4SLinus Torvalds .lookup = befs_lookup, 731da177e4SLinus Torvalds }; 741da177e4SLinus Torvalds 75f5e54d6eSChristoph Hellwig static const struct address_space_operations befs_aops = { 761da177e4SLinus Torvalds .readpage = befs_readpage, 771da177e4SLinus Torvalds .sync_page = block_sync_page, 781da177e4SLinus Torvalds .bmap = befs_bmap, 791da177e4SLinus Torvalds }; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds static struct inode_operations befs_symlink_inode_operations = { 821da177e4SLinus Torvalds .readlink = generic_readlink, 831da177e4SLinus Torvalds .follow_link = befs_follow_link, 841da177e4SLinus Torvalds .put_link = befs_put_link, 851da177e4SLinus Torvalds }; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds /* 881da177e4SLinus Torvalds * Called by generic_file_read() to read a page of data 891da177e4SLinus Torvalds * 901da177e4SLinus Torvalds * In turn, simply calls a generic block read function and 911da177e4SLinus Torvalds * passes it the address of befs_get_block, for mapping file 921da177e4SLinus Torvalds * positions to disk blocks. 931da177e4SLinus Torvalds */ 941da177e4SLinus Torvalds static int 951da177e4SLinus Torvalds befs_readpage(struct file *file, struct page *page) 961da177e4SLinus Torvalds { 971da177e4SLinus Torvalds return block_read_full_page(page, befs_get_block); 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds static sector_t 1011da177e4SLinus Torvalds befs_bmap(struct address_space *mapping, sector_t block) 1021da177e4SLinus Torvalds { 1031da177e4SLinus Torvalds return generic_block_bmap(mapping, block, befs_get_block); 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* 1071da177e4SLinus Torvalds * Generic function to map a file position (block) to a 1081da177e4SLinus Torvalds * disk offset (passed back in bh_result). 1091da177e4SLinus Torvalds * 1101da177e4SLinus Torvalds * Used by many higher level functions. 1111da177e4SLinus Torvalds * 1121da177e4SLinus Torvalds * Calls befs_fblock2brun() in datastream.c to do the real work. 1131da177e4SLinus Torvalds * 1141da177e4SLinus Torvalds * -WD 10-26-01 1151da177e4SLinus Torvalds */ 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds static int 1181da177e4SLinus Torvalds befs_get_block(struct inode *inode, sector_t block, 1191da177e4SLinus Torvalds struct buffer_head *bh_result, int create) 1201da177e4SLinus Torvalds { 1211da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 1221da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 1231da177e4SLinus Torvalds befs_block_run run = BAD_IADDR; 1241da177e4SLinus Torvalds int res = 0; 1251da177e4SLinus Torvalds ulong disk_off; 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", 1281da177e4SLinus Torvalds inode->i_ino, block); 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds if (block < 0) { 1311da177e4SLinus Torvalds befs_error(sb, "befs_get_block() was asked for a block " 1321da177e4SLinus Torvalds "number less than zero: block %ld in inode %lu", 1331da177e4SLinus Torvalds block, inode->i_ino); 1341da177e4SLinus Torvalds return -EIO; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds if (create) { 1381da177e4SLinus Torvalds befs_error(sb, "befs_get_block() was asked to write to " 1391da177e4SLinus Torvalds "block %ld in inode %lu", block, inode->i_ino); 1401da177e4SLinus Torvalds return -EPERM; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds res = befs_fblock2brun(sb, ds, block, &run); 1441da177e4SLinus Torvalds if (res != BEFS_OK) { 1451da177e4SLinus Torvalds befs_error(sb, 1461da177e4SLinus Torvalds "<--- befs_get_block() for inode %lu, block " 1471da177e4SLinus Torvalds "%ld ERROR", inode->i_ino, block); 1481da177e4SLinus Torvalds return -EFBIG; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds disk_off = (ulong) iaddr2blockno(sb, &run); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds map_bh(bh_result, inode->i_sb, disk_off); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, " 1561da177e4SLinus Torvalds "disk address %lu", inode->i_ino, block, disk_off); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds return 0; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds static struct dentry * 1621da177e4SLinus Torvalds befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds struct inode *inode = NULL; 1651da177e4SLinus Torvalds struct super_block *sb = dir->i_sb; 1661da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; 1671da177e4SLinus Torvalds befs_off_t offset; 1681da177e4SLinus Torvalds int ret; 1691da177e4SLinus Torvalds int utfnamelen; 1701da177e4SLinus Torvalds char *utfname; 1711da177e4SLinus Torvalds const char *name = dentry->d_name.name; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds befs_debug(sb, "---> befs_lookup() " 1741da177e4SLinus Torvalds "name %s inode %ld", dentry->d_name.name, dir->i_ino); 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* Convert to UTF-8 */ 1771da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 1781da177e4SLinus Torvalds ret = 1791da177e4SLinus Torvalds befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); 1801da177e4SLinus Torvalds if (ret < 0) { 1811da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup() ERROR"); 1821da177e4SLinus Torvalds return ERR_PTR(ret); 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, utfname, &offset); 1851da177e4SLinus Torvalds kfree(utfname); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds } else { 1881da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds if (ret == BEFS_BT_NOT_FOUND) { 1921da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup() %s not found", 1931da177e4SLinus Torvalds dentry->d_name.name); 1941da177e4SLinus Torvalds return ERR_PTR(-ENOENT); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds } else if (ret != BEFS_OK || offset == 0) { 1971da177e4SLinus Torvalds befs_warning(sb, "<--- befs_lookup() Error"); 1981da177e4SLinus Torvalds return ERR_PTR(-ENODATA); 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds inode = iget(dir->i_sb, (ino_t) offset); 2021da177e4SLinus Torvalds if (!inode) 2031da177e4SLinus Torvalds return ERR_PTR(-EACCES); 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds d_add(dentry, inode); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup()"); 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds return NULL; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds static int 2131da177e4SLinus Torvalds befs_readdir(struct file *filp, void *dirent, filldir_t filldir) 2141da177e4SLinus Torvalds { 2151da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 2161da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 2171da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 2181da177e4SLinus Torvalds befs_off_t value; 2191da177e4SLinus Torvalds int result; 2201da177e4SLinus Torvalds size_t keysize; 2211da177e4SLinus Torvalds unsigned char d_type; 2221da177e4SLinus Torvalds char keybuf[BEFS_NAME_LEN + 1]; 2231da177e4SLinus Torvalds char *nlsname; 2241da177e4SLinus Torvalds int nlsnamelen; 2251da177e4SLinus Torvalds const char *dirname = filp->f_dentry->d_name.name; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds befs_debug(sb, "---> befs_readdir() " 2281da177e4SLinus Torvalds "name %s, inode %ld, filp->f_pos %Ld", 2291da177e4SLinus Torvalds dirname, inode->i_ino, filp->f_pos); 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1, 2321da177e4SLinus Torvalds keybuf, &keysize, &value); 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds if (result == BEFS_ERR) { 2351da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() ERROR"); 2361da177e4SLinus Torvalds befs_error(sb, "IO error reading %s (inode %lu)", 2371da177e4SLinus Torvalds dirname, inode->i_ino); 2381da177e4SLinus Torvalds return -EIO; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds } else if (result == BEFS_BT_END) { 2411da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() END"); 2421da177e4SLinus Torvalds return 0; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds } else if (result == BEFS_BT_EMPTY) { 2451da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() Empty directory"); 2461da177e4SLinus Torvalds return 0; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds d_type = DT_UNKNOWN; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* Convert to NLS */ 2521da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 2531da177e4SLinus Torvalds result = 2541da177e4SLinus Torvalds befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); 2551da177e4SLinus Torvalds if (result < 0) { 2561da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() ERROR"); 2571da177e4SLinus Torvalds return result; 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos, 2601da177e4SLinus Torvalds (ino_t) value, d_type); 2611da177e4SLinus Torvalds kfree(nlsname); 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds } else { 2641da177e4SLinus Torvalds result = filldir(dirent, keybuf, keysize, filp->f_pos, 2651da177e4SLinus Torvalds (ino_t) value, d_type); 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds filp->f_pos++; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos); 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds return 0; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds static struct inode * 2761da177e4SLinus Torvalds befs_alloc_inode(struct super_block *sb) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds struct befs_inode_info *bi; 2791da177e4SLinus Torvalds bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, 280e94b1766SChristoph Lameter GFP_KERNEL); 2811da177e4SLinus Torvalds if (!bi) 2821da177e4SLinus Torvalds return NULL; 2831da177e4SLinus Torvalds return &bi->vfs_inode; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds static void 2871da177e4SLinus Torvalds befs_destroy_inode(struct inode *inode) 2881da177e4SLinus Torvalds { 2891da177e4SLinus Torvalds kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 292e18b890bSChristoph Lameter static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) 2931da177e4SLinus Torvalds { 2941da177e4SLinus Torvalds struct befs_inode_info *bi = (struct befs_inode_info *) foo; 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 2971da177e4SLinus Torvalds SLAB_CTOR_CONSTRUCTOR) { 2981da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds static void 3031da177e4SLinus Torvalds befs_read_inode(struct inode *inode) 3041da177e4SLinus Torvalds { 3051da177e4SLinus Torvalds struct buffer_head *bh = NULL; 3061da177e4SLinus Torvalds befs_inode *raw_inode = NULL; 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 3091da177e4SLinus Torvalds befs_sb_info *befs_sb = BEFS_SB(sb); 3101da177e4SLinus Torvalds befs_inode_info *befs_ino = NULL; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino); 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds befs_ino = BEFS_I(inode); 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds /* convert from vfs's inode number to befs's inode number */ 3171da177e4SLinus Torvalds befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds befs_debug(sb, " real inode number [%u, %hu, %hu]", 3201da177e4SLinus Torvalds befs_ino->i_inode_num.allocation_group, 3211da177e4SLinus Torvalds befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds bh = befs_bread(sb, inode->i_ino); 3241da177e4SLinus Torvalds if (!bh) { 3251da177e4SLinus Torvalds befs_error(sb, "unable to read inode block - " 3261da177e4SLinus Torvalds "inode = %lu", inode->i_ino); 3270418726bSAdrian Bunk goto unacquire_none; 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds raw_inode = (befs_inode *) bh->b_data; 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds befs_dump_inode(sb, raw_inode); 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 3351da177e4SLinus Torvalds befs_error(sb, "Bad inode: %lu", inode->i_ino); 3360418726bSAdrian Bunk goto unacquire_bh; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds /* 3421da177e4SLinus Torvalds * set uid and gid. But since current BeOS is single user OS, so 3431da177e4SLinus Torvalds * you can change by "uid" or "gid" options. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds inode->i_uid = befs_sb->mount_opts.use_uid ? 3471da177e4SLinus Torvalds befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); 3481da177e4SLinus Torvalds inode->i_gid = befs_sb->mount_opts.use_gid ? 3491da177e4SLinus Torvalds befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds inode->i_nlink = 1; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds /* 3541da177e4SLinus Torvalds * BEFS's time is 64 bits, but current VFS is 32 bits... 3551da177e4SLinus Torvalds * BEFS don't have access time. Nor inode change time. VFS 3561da177e4SLinus Torvalds * doesn't have creation time. 3571da177e4SLinus Torvalds * Also, the lower 16 bits of the last_modified_time and 3581da177e4SLinus Torvalds * create_time are just a counter to help ensure uniqueness 3591da177e4SLinus Torvalds * for indexing purposes. (PFD, page 54) 3601da177e4SLinus Torvalds */ 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds inode->i_mtime.tv_sec = 3631da177e4SLinus Torvalds fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 3641da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 3651da177e4SLinus Torvalds inode->i_ctime = inode->i_mtime; 3661da177e4SLinus Torvalds inode->i_atime = inode->i_mtime; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 3691da177e4SLinus Torvalds befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 3701da177e4SLinus Torvalds befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 3711da177e4SLinus Torvalds befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 3741da177e4SLinus Torvalds inode->i_size = 0; 3751da177e4SLinus Torvalds inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 3761da177e4SLinus Torvalds strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 3771da177e4SLinus Torvalds BEFS_SYMLINK_LEN); 3781da177e4SLinus Torvalds } else { 3791da177e4SLinus Torvalds int num_blks; 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds befs_ino->i_data.ds = 3821da177e4SLinus Torvalds fsds_to_cpu(sb, raw_inode->data.datastream); 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 3851da177e4SLinus Torvalds inode->i_blocks = 3861da177e4SLinus Torvalds num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 3871da177e4SLinus Torvalds inode->i_size = befs_ino->i_data.ds.size; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds inode->i_mapping->a_ops = &befs_aops; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds if (S_ISREG(inode->i_mode)) { 3932cf06916SChristoph Hellwig inode->i_fop = &generic_ro_fops; 3941da177e4SLinus Torvalds } else if (S_ISDIR(inode->i_mode)) { 3951da177e4SLinus Torvalds inode->i_op = &befs_dir_inode_operations; 3961da177e4SLinus Torvalds inode->i_fop = &befs_dir_operations; 3971da177e4SLinus Torvalds } else if (S_ISLNK(inode->i_mode)) { 3981da177e4SLinus Torvalds inode->i_op = &befs_symlink_inode_operations; 3991da177e4SLinus Torvalds } else { 4001da177e4SLinus Torvalds befs_error(sb, "Inode %lu is not a regular file, " 4011da177e4SLinus Torvalds "directory or symlink. THAT IS WRONG! BeFS has no " 4021da177e4SLinus Torvalds "on disk special files", inode->i_ino); 4030418726bSAdrian Bunk goto unacquire_bh; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds brelse(bh); 4071da177e4SLinus Torvalds befs_debug(sb, "<--- befs_read_inode()"); 4081da177e4SLinus Torvalds return; 4091da177e4SLinus Torvalds 4100418726bSAdrian Bunk unacquire_bh: 4111da177e4SLinus Torvalds brelse(bh); 4121da177e4SLinus Torvalds 4130418726bSAdrian Bunk unacquire_none: 4141da177e4SLinus Torvalds make_bad_inode(inode); 4151da177e4SLinus Torvalds befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 4161da177e4SLinus Torvalds return; 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* Initialize the inode cache. Called at fs setup. 4201da177e4SLinus Torvalds * 4211da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4221da177e4SLinus Torvalds */ 4231da177e4SLinus Torvalds static int 4241da177e4SLinus Torvalds befs_init_inodecache(void) 4251da177e4SLinus Torvalds { 4261da177e4SLinus Torvalds befs_inode_cachep = kmem_cache_create("befs_inode_cache", 4271da177e4SLinus Torvalds sizeof (struct befs_inode_info), 428fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 429fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 4301da177e4SLinus Torvalds init_once, NULL); 4311da177e4SLinus Torvalds if (befs_inode_cachep == NULL) { 4321da177e4SLinus Torvalds printk(KERN_ERR "befs_init_inodecache: " 4331da177e4SLinus Torvalds "Couldn't initalize inode slabcache\n"); 4341da177e4SLinus Torvalds return -ENOMEM; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds return 0; 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds /* Called at fs teardown. 4411da177e4SLinus Torvalds * 4421da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4431da177e4SLinus Torvalds */ 4441da177e4SLinus Torvalds static void 4451da177e4SLinus Torvalds befs_destroy_inodecache(void) 4461da177e4SLinus Torvalds { 4471a1d92c1SAlexey Dobriyan kmem_cache_destroy(befs_inode_cachep); 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds /* 4511da177e4SLinus Torvalds * The inode of symbolic link is different to data stream. 4521da177e4SLinus Torvalds * The data stream become link name. Unless the LONG_SYMLINK 4531da177e4SLinus Torvalds * flag is set. 4541da177e4SLinus Torvalds */ 455db873896SLinus Torvalds static void * 4561da177e4SLinus Torvalds befs_follow_link(struct dentry *dentry, struct nameidata *nd) 4571da177e4SLinus Torvalds { 4581da177e4SLinus Torvalds befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 4591da177e4SLinus Torvalds char *link; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 4621da177e4SLinus Torvalds struct super_block *sb = dentry->d_sb; 4631da177e4SLinus Torvalds befs_data_stream *data = &befs_ino->i_data.ds; 4641da177e4SLinus Torvalds befs_off_t len = data->size; 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds befs_debug(sb, "Follow long symlink"); 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds link = kmalloc(len, GFP_NOFS); 4691da177e4SLinus Torvalds if (!link) { 4701da177e4SLinus Torvalds link = ERR_PTR(-ENOMEM); 4711da177e4SLinus Torvalds } else if (befs_read_lsymlink(sb, data, link, len) != len) { 4721da177e4SLinus Torvalds kfree(link); 4731da177e4SLinus Torvalds befs_error(sb, "Failed to read entire long symlink"); 4741da177e4SLinus Torvalds link = ERR_PTR(-EIO); 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds } else { 4771da177e4SLinus Torvalds link = befs_ino->i_data.symlink; 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds nd_set_link(nd, link); 481008b150aSAl Viro return NULL; 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds 484008b150aSAl Viro static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 4851da177e4SLinus Torvalds { 4861da177e4SLinus Torvalds befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 4871da177e4SLinus Torvalds if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 4881da177e4SLinus Torvalds char *p = nd_get_link(nd); 4891da177e4SLinus Torvalds if (!IS_ERR(p)) 4901da177e4SLinus Torvalds kfree(p); 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds /* 4951da177e4SLinus Torvalds * UTF-8 to NLS charset convert routine 4961da177e4SLinus Torvalds * 4971da177e4SLinus Torvalds * 4981da177e4SLinus Torvalds * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 4991da177e4SLinus Torvalds * the nls tables directly 5001da177e4SLinus Torvalds */ 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds static int 5031da177e4SLinus Torvalds befs_utf2nls(struct super_block *sb, const char *in, 5041da177e4SLinus Torvalds int in_len, char **out, int *out_len) 5051da177e4SLinus Torvalds { 5061da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 5071da177e4SLinus Torvalds int i, o; 5081da177e4SLinus Torvalds wchar_t uni; 5091da177e4SLinus Torvalds int unilen, utflen; 5101da177e4SLinus Torvalds char *result; 51194f563c4SDiego Calleja /* The utf8->nls conversion won't make the final nls string bigger 51294f563c4SDiego Calleja * than the utf one, but if the string is pure ascii they'll have the 51394f563c4SDiego Calleja * same width and an extra char is needed to save the additional \0 51494f563c4SDiego Calleja */ 51594f563c4SDiego Calleja int maxlen = in_len + 1; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds befs_debug(sb, "---> utf2nls()"); 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds if (!nls) { 5201da177e4SLinus Torvalds befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 5211da177e4SLinus Torvalds return -EINVAL; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 5251da177e4SLinus Torvalds if (!*out) { 5261da177e4SLinus Torvalds befs_error(sb, "befs_utf2nls() cannot allocate memory"); 5271da177e4SLinus Torvalds *out_len = 0; 5281da177e4SLinus Torvalds return -ENOMEM; 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += utflen, o += unilen) { 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds /* convert from UTF-8 to Unicode */ 5341da177e4SLinus Torvalds utflen = utf8_mbtowc(&uni, &in[i], in_len - i); 5351da177e4SLinus Torvalds if (utflen < 0) { 5361da177e4SLinus Torvalds goto conv_err; 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds /* convert from Unicode to nls */ 5401da177e4SLinus Torvalds unilen = nls->uni2char(uni, &result[o], in_len - o); 5411da177e4SLinus Torvalds if (unilen < 0) { 5421da177e4SLinus Torvalds goto conv_err; 5431da177e4SLinus Torvalds } 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds result[o] = '\0'; 5461da177e4SLinus Torvalds *out_len = o; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds befs_debug(sb, "<--- utf2nls()"); 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds return o; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds conv_err: 5531da177e4SLinus Torvalds befs_error(sb, "Name using character set %s contains a character that " 5541da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 5551da177e4SLinus Torvalds befs_debug(sb, "<--- utf2nls()"); 5561da177e4SLinus Torvalds kfree(result); 5571da177e4SLinus Torvalds return -EILSEQ; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds /** 5611da177e4SLinus Torvalds * befs_nls2utf - Convert NLS string to utf8 encodeing 5621da177e4SLinus Torvalds * @sb: Superblock 5631da177e4SLinus Torvalds * @src: Input string buffer in NLS format 5641da177e4SLinus Torvalds * @srclen: Length of input string in bytes 5654de151d8SAlexey Dobriyan * @dest: The output string in UTF-8 format 5661da177e4SLinus Torvalds * @destlen: Length of the output buffer 5671da177e4SLinus Torvalds * 5681da177e4SLinus Torvalds * Converts input string @src, which is in the format of the loaded NLS map, 5691da177e4SLinus Torvalds * into a utf8 string. 5701da177e4SLinus Torvalds * 5711da177e4SLinus Torvalds * The destination string @dest is allocated by this function and the caller is 5721da177e4SLinus Torvalds * responsible for freeing it with kfree() 5731da177e4SLinus Torvalds * 5741da177e4SLinus Torvalds * On return, *@destlen is the length of @dest in bytes. 5751da177e4SLinus Torvalds * 5761da177e4SLinus Torvalds * On success, the return value is the number of utf8 characters written to 5771da177e4SLinus Torvalds * the output buffer @dest. 5781da177e4SLinus Torvalds * 5791da177e4SLinus Torvalds * On Failure, a negative number coresponding to the error code is returned. 5801da177e4SLinus Torvalds */ 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds static int 5831da177e4SLinus Torvalds befs_nls2utf(struct super_block *sb, const char *in, 5841da177e4SLinus Torvalds int in_len, char **out, int *out_len) 5851da177e4SLinus Torvalds { 5861da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 5871da177e4SLinus Torvalds int i, o; 5881da177e4SLinus Torvalds wchar_t uni; 5891da177e4SLinus Torvalds int unilen, utflen; 5901da177e4SLinus Torvalds char *result; 59194f563c4SDiego Calleja /* There're nls characters that will translate to 3-chars-wide UTF-8 59294f563c4SDiego Calleja * characters, a additional byte is needed to save the final \0 59394f563c4SDiego Calleja * in special cases */ 59494f563c4SDiego Calleja int maxlen = (3 * in_len) + 1; 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds befs_debug(sb, "---> nls2utf()\n"); 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds if (!nls) { 5991da177e4SLinus Torvalds befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 6001da177e4SLinus Torvalds return -EINVAL; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 6041da177e4SLinus Torvalds if (!*out) { 6051da177e4SLinus Torvalds befs_error(sb, "befs_nls2utf() cannot allocate memory"); 6061da177e4SLinus Torvalds *out_len = 0; 6071da177e4SLinus Torvalds return -ENOMEM; 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += unilen, o += utflen) { 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds /* convert from nls to unicode */ 6131da177e4SLinus Torvalds unilen = nls->char2uni(&in[i], in_len - i, &uni); 6141da177e4SLinus Torvalds if (unilen < 0) { 6151da177e4SLinus Torvalds goto conv_err; 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds /* convert from unicode to UTF-8 */ 6191da177e4SLinus Torvalds utflen = utf8_wctomb(&result[o], uni, 3); 6201da177e4SLinus Torvalds if (utflen <= 0) { 6211da177e4SLinus Torvalds goto conv_err; 6221da177e4SLinus Torvalds } 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds result[o] = '\0'; 6261da177e4SLinus Torvalds *out_len = o; 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds befs_debug(sb, "<--- nls2utf()"); 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds return i; 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds conv_err: 6331da177e4SLinus Torvalds befs_error(sb, "Name using charecter set %s contains a charecter that " 6341da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 6351da177e4SLinus Torvalds befs_debug(sb, "<--- nls2utf()"); 6361da177e4SLinus Torvalds kfree(result); 6371da177e4SLinus Torvalds return -EILSEQ; 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /** 6411da177e4SLinus Torvalds * Use the 6421da177e4SLinus Torvalds * 6431da177e4SLinus Torvalds */ 6441da177e4SLinus Torvalds enum { 6451da177e4SLinus Torvalds Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 6461da177e4SLinus Torvalds }; 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds static match_table_t befs_tokens = { 6491da177e4SLinus Torvalds {Opt_uid, "uid=%d"}, 6501da177e4SLinus Torvalds {Opt_gid, "gid=%d"}, 6511da177e4SLinus Torvalds {Opt_charset, "iocharset=%s"}, 6521da177e4SLinus Torvalds {Opt_debug, "debug"}, 6531da177e4SLinus Torvalds {Opt_err, NULL} 6541da177e4SLinus Torvalds }; 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds static int 6571da177e4SLinus Torvalds parse_options(char *options, befs_mount_options * opts) 6581da177e4SLinus Torvalds { 6591da177e4SLinus Torvalds char *p; 6601da177e4SLinus Torvalds substring_t args[MAX_OPT_ARGS]; 6611da177e4SLinus Torvalds int option; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds /* Initialize options */ 6641da177e4SLinus Torvalds opts->uid = 0; 6651da177e4SLinus Torvalds opts->gid = 0; 6661da177e4SLinus Torvalds opts->use_uid = 0; 6671da177e4SLinus Torvalds opts->use_gid = 0; 6681da177e4SLinus Torvalds opts->iocharset = NULL; 6691da177e4SLinus Torvalds opts->debug = 0; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds if (!options) 6721da177e4SLinus Torvalds return 1; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds while ((p = strsep(&options, ",")) != NULL) { 6751da177e4SLinus Torvalds int token; 6761da177e4SLinus Torvalds if (!*p) 6771da177e4SLinus Torvalds continue; 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds token = match_token(p, befs_tokens, args); 6801da177e4SLinus Torvalds switch (token) { 6811da177e4SLinus Torvalds case Opt_uid: 6821da177e4SLinus Torvalds if (match_int(&args[0], &option)) 6831da177e4SLinus Torvalds return 0; 6841da177e4SLinus Torvalds if (option < 0) { 6851da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Invalid uid %d, " 6861da177e4SLinus Torvalds "using default\n", option); 6871da177e4SLinus Torvalds break; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds opts->uid = option; 6901da177e4SLinus Torvalds opts->use_uid = 1; 6911da177e4SLinus Torvalds break; 6921da177e4SLinus Torvalds case Opt_gid: 6931da177e4SLinus Torvalds if (match_int(&args[0], &option)) 6941da177e4SLinus Torvalds return 0; 6951da177e4SLinus Torvalds if (option < 0) { 6961da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Invalid gid %d, " 6971da177e4SLinus Torvalds "using default\n", option); 6981da177e4SLinus Torvalds break; 6991da177e4SLinus Torvalds } 7001da177e4SLinus Torvalds opts->gid = option; 7011da177e4SLinus Torvalds opts->use_gid = 1; 7021da177e4SLinus Torvalds break; 7031da177e4SLinus Torvalds case Opt_charset: 7041da177e4SLinus Torvalds kfree(opts->iocharset); 7051da177e4SLinus Torvalds opts->iocharset = match_strdup(&args[0]); 7061da177e4SLinus Torvalds if (!opts->iocharset) { 7071da177e4SLinus Torvalds printk(KERN_ERR "BeFS: allocation failure for " 7081da177e4SLinus Torvalds "iocharset string\n"); 7091da177e4SLinus Torvalds return 0; 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds break; 7121da177e4SLinus Torvalds case Opt_debug: 7131da177e4SLinus Torvalds opts->debug = 1; 7141da177e4SLinus Torvalds break; 7151da177e4SLinus Torvalds default: 7161da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 7171da177e4SLinus Torvalds "or missing value\n", p); 7181da177e4SLinus Torvalds return 0; 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds return 1; 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds /* This function has the responsibiltiy of getting the 7251da177e4SLinus Torvalds * filesystem ready for unmounting. 7261da177e4SLinus Torvalds * Basicly, we free everything that we allocated in 7271da177e4SLinus Torvalds * befs_read_inode 7281da177e4SLinus Torvalds */ 7291da177e4SLinus Torvalds static void 7301da177e4SLinus Torvalds befs_put_super(struct super_block *sb) 7311da177e4SLinus Torvalds { 7321da177e4SLinus Torvalds kfree(BEFS_SB(sb)->mount_opts.iocharset); 7331da177e4SLinus Torvalds BEFS_SB(sb)->mount_opts.iocharset = NULL; 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 7361da177e4SLinus Torvalds unload_nls(BEFS_SB(sb)->nls); 7371da177e4SLinus Torvalds BEFS_SB(sb)->nls = NULL; 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds kfree(sb->s_fs_info); 7411da177e4SLinus Torvalds sb->s_fs_info = NULL; 7421da177e4SLinus Torvalds return; 7431da177e4SLinus Torvalds } 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds /* Allocate private field of the superblock, fill it. 7461da177e4SLinus Torvalds * 7471da177e4SLinus Torvalds * Finish filling the public superblock fields 7481da177e4SLinus Torvalds * Make the root directory 7491da177e4SLinus Torvalds * Load a set of NLS translations if needed. 7501da177e4SLinus Torvalds */ 7511da177e4SLinus Torvalds static int 7521da177e4SLinus Torvalds befs_fill_super(struct super_block *sb, void *data, int silent) 7531da177e4SLinus Torvalds { 7541da177e4SLinus Torvalds struct buffer_head *bh; 7551da177e4SLinus Torvalds befs_sb_info *befs_sb; 7561da177e4SLinus Torvalds befs_super_block *disk_sb; 7571da177e4SLinus Torvalds struct inode *root; 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds const unsigned long sb_block = 0; 7601da177e4SLinus Torvalds const off_t x86_sb_off = 512; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 7631da177e4SLinus Torvalds if (sb->s_fs_info == NULL) { 7641da177e4SLinus Torvalds printk(KERN_ERR 7651da177e4SLinus Torvalds "BeFS(%s): Unable to allocate memory for private " 7661da177e4SLinus Torvalds "portion of superblock. Bailing.\n", sb->s_id); 7670418726bSAdrian Bunk goto unacquire_none; 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds befs_sb = BEFS_SB(sb); 7701da177e4SLinus Torvalds memset(befs_sb, 0, sizeof(befs_sb_info)); 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds if (!parse_options((char *) data, &befs_sb->mount_opts)) { 7731da177e4SLinus Torvalds befs_error(sb, "cannot parse mount options"); 7740418726bSAdrian Bunk goto unacquire_priv_sbp; 7751da177e4SLinus Torvalds } 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds befs_debug(sb, "---> befs_fill_super()"); 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds #ifndef CONFIG_BEFS_RW 7801da177e4SLinus Torvalds if (!(sb->s_flags & MS_RDONLY)) { 7811da177e4SLinus Torvalds befs_warning(sb, 7821da177e4SLinus Torvalds "No write support. Marking filesystem read-only"); 7831da177e4SLinus Torvalds sb->s_flags |= MS_RDONLY; 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds #endif /* CONFIG_BEFS_RW */ 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds /* 7881da177e4SLinus Torvalds * Set dummy blocksize to read super block. 7891da177e4SLinus Torvalds * Will be set to real fs blocksize later. 7901da177e4SLinus Torvalds * 7911da177e4SLinus Torvalds * Linux 2.4.10 and later refuse to read blocks smaller than 7921da177e4SLinus Torvalds * the hardsect size for the device. But we also need to read at 7931da177e4SLinus Torvalds * least 1k to get the second 512 bytes of the volume. 7941da177e4SLinus Torvalds * -WD 10-26-01 7951da177e4SLinus Torvalds */ 7961da177e4SLinus Torvalds sb_min_blocksize(sb, 1024); 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds if (!(bh = sb_bread(sb, sb_block))) { 7991da177e4SLinus Torvalds befs_error(sb, "unable to read superblock"); 8000418726bSAdrian Bunk goto unacquire_priv_sbp; 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds /* account for offset of super block on x86 */ 8041da177e4SLinus Torvalds disk_sb = (befs_super_block *) bh->b_data; 8051da177e4SLinus Torvalds if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) || 8061da177e4SLinus Torvalds (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) { 8071da177e4SLinus Torvalds befs_debug(sb, "Using PPC superblock location"); 8081da177e4SLinus Torvalds } else { 8091da177e4SLinus Torvalds befs_debug(sb, "Using x86 superblock location"); 8101da177e4SLinus Torvalds disk_sb = 8111da177e4SLinus Torvalds (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds if (befs_load_sb(sb, disk_sb) != BEFS_OK) 8150418726bSAdrian Bunk goto unacquire_bh; 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds befs_dump_super_block(sb, disk_sb); 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvalds brelse(bh); 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds if (befs_check_sb(sb) != BEFS_OK) 8220418726bSAdrian Bunk goto unacquire_priv_sbp; 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds if( befs_sb->num_blocks > ~((sector_t)0) ) { 8251da177e4SLinus Torvalds befs_error(sb, "blocks count: %Lu " 8261da177e4SLinus Torvalds "is larger than the host can use", 8271da177e4SLinus Torvalds befs_sb->num_blocks); 8280418726bSAdrian Bunk goto unacquire_priv_sbp; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds /* 8321da177e4SLinus Torvalds * set up enough so that it can read an inode 8331da177e4SLinus Torvalds * Fill in kernel superblock fields from private sb 8341da177e4SLinus Torvalds */ 8351da177e4SLinus Torvalds sb->s_magic = BEFS_SUPER_MAGIC; 8361da177e4SLinus Torvalds /* Set real blocksize of fs */ 8371da177e4SLinus Torvalds sb_set_blocksize(sb, (ulong) befs_sb->block_size); 8381da177e4SLinus Torvalds sb->s_op = (struct super_operations *) &befs_sops; 8391da177e4SLinus Torvalds root = iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 8401da177e4SLinus Torvalds sb->s_root = d_alloc_root(root); 8411da177e4SLinus Torvalds if (!sb->s_root) { 8421da177e4SLinus Torvalds iput(root); 8431da177e4SLinus Torvalds befs_error(sb, "get root inode failed"); 8440418726bSAdrian Bunk goto unacquire_priv_sbp; 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds /* load nls library */ 8481da177e4SLinus Torvalds if (befs_sb->mount_opts.iocharset) { 8491da177e4SLinus Torvalds befs_debug(sb, "Loading nls: %s", 8501da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8511da177e4SLinus Torvalds befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 8521da177e4SLinus Torvalds if (!befs_sb->nls) { 8531da177e4SLinus Torvalds befs_warning(sb, "Cannot load nls %s" 8541da177e4SLinus Torvalds " loading default nls", 8551da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8561da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8571da177e4SLinus Torvalds } 8581da177e4SLinus Torvalds /* load default nls if none is specified in mount options */ 8591da177e4SLinus Torvalds } else { 8601da177e4SLinus Torvalds befs_debug(sb, "Loading default nls"); 8611da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8621da177e4SLinus Torvalds } 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds return 0; 8651da177e4SLinus Torvalds /*****************/ 8660418726bSAdrian Bunk unacquire_bh: 8671da177e4SLinus Torvalds brelse(bh); 8681da177e4SLinus Torvalds 8690418726bSAdrian Bunk unacquire_priv_sbp: 8701da177e4SLinus Torvalds kfree(sb->s_fs_info); 8711da177e4SLinus Torvalds 8720418726bSAdrian Bunk unacquire_none: 8731da177e4SLinus Torvalds sb->s_fs_info = NULL; 8741da177e4SLinus Torvalds return -EINVAL; 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds static int 8781da177e4SLinus Torvalds befs_remount(struct super_block *sb, int *flags, char *data) 8791da177e4SLinus Torvalds { 8801da177e4SLinus Torvalds if (!(*flags & MS_RDONLY)) 8811da177e4SLinus Torvalds return -EINVAL; 8821da177e4SLinus Torvalds return 0; 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds static int 886726c3342SDavid Howells befs_statfs(struct dentry *dentry, struct kstatfs *buf) 8871da177e4SLinus Torvalds { 888726c3342SDavid Howells struct super_block *sb = dentry->d_sb; 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds befs_debug(sb, "---> befs_statfs()"); 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds buf->f_type = BEFS_SUPER_MAGIC; 8931da177e4SLinus Torvalds buf->f_bsize = sb->s_blocksize; 8941da177e4SLinus Torvalds buf->f_blocks = BEFS_SB(sb)->num_blocks; 8951da177e4SLinus Torvalds buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 8961da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree; 8971da177e4SLinus Torvalds buf->f_files = 0; /* UNKNOWN */ 8981da177e4SLinus Torvalds buf->f_ffree = 0; /* UNKNOWN */ 8991da177e4SLinus Torvalds buf->f_namelen = BEFS_NAME_LEN; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds befs_debug(sb, "<--- befs_statfs()"); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds return 0; 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds 906454e2398SDavid Howells static int 9071da177e4SLinus Torvalds befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, 908454e2398SDavid Howells void *data, struct vfsmount *mnt) 9091da177e4SLinus Torvalds { 910454e2398SDavid Howells return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, 911454e2398SDavid Howells mnt); 9121da177e4SLinus Torvalds } 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds static struct file_system_type befs_fs_type = { 9151da177e4SLinus Torvalds .owner = THIS_MODULE, 9161da177e4SLinus Torvalds .name = "befs", 9171da177e4SLinus Torvalds .get_sb = befs_get_sb, 9181da177e4SLinus Torvalds .kill_sb = kill_block_super, 9191da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 9201da177e4SLinus Torvalds }; 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds static int __init 9231da177e4SLinus Torvalds init_befs_fs(void) 9241da177e4SLinus Torvalds { 9251da177e4SLinus Torvalds int err; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds err = befs_init_inodecache(); 9301da177e4SLinus Torvalds if (err) 9310418726bSAdrian Bunk goto unacquire_none; 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds err = register_filesystem(&befs_fs_type); 9341da177e4SLinus Torvalds if (err) 9350418726bSAdrian Bunk goto unacquire_inodecache; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds return 0; 9381da177e4SLinus Torvalds 9390418726bSAdrian Bunk unacquire_inodecache: 9401da177e4SLinus Torvalds befs_destroy_inodecache(); 9411da177e4SLinus Torvalds 9420418726bSAdrian Bunk unacquire_none: 9431da177e4SLinus Torvalds return err; 9441da177e4SLinus Torvalds } 9451da177e4SLinus Torvalds 9461da177e4SLinus Torvalds static void __exit 9471da177e4SLinus Torvalds exit_befs_fs(void) 9481da177e4SLinus Torvalds { 9491da177e4SLinus Torvalds befs_destroy_inodecache(); 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds unregister_filesystem(&befs_fs_type); 9521da177e4SLinus Torvalds } 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds /* 9551da177e4SLinus Torvalds Macros that typecheck the init and exit functions, 9561da177e4SLinus Torvalds ensures that they are called at init and cleanup, 9571da177e4SLinus Torvalds and eliminates warnings about unused functions. 9581da177e4SLinus Torvalds */ 9591da177e4SLinus Torvalds module_init(init_befs_fs) 9601da177e4SLinus Torvalds module_exit(exit_befs_fs) 961