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> 1831aba059SEric W. Biederman #include <linux/sched.h> 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include "befs.h" 211da177e4SLinus Torvalds #include "btree.h" 221da177e4SLinus Torvalds #include "inode.h" 231da177e4SLinus Torvalds #include "datastream.h" 241da177e4SLinus Torvalds #include "super.h" 251da177e4SLinus Torvalds #include "io.h" 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); 281da177e4SLinus Torvalds MODULE_AUTHOR("Will Dyson"); 291da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds /* The units the vfs expects inode->i_blocks to be in */ 321da177e4SLinus Torvalds #define VFS_BLOCK_SIZE 512 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds static int befs_readdir(struct file *, void *, filldir_t); 351da177e4SLinus Torvalds static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); 361da177e4SLinus Torvalds static int befs_readpage(struct file *file, struct page *page); 371da177e4SLinus Torvalds static sector_t befs_bmap(struct address_space *mapping, sector_t block); 3800cd8dd3SAl Viro static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); 3996eb5419SDavid Howells static struct inode *befs_iget(struct super_block *, unsigned long); 401da177e4SLinus Torvalds static struct inode *befs_alloc_inode(struct super_block *sb); 411da177e4SLinus Torvalds static void befs_destroy_inode(struct inode *inode); 421da177e4SLinus Torvalds static int befs_init_inodecache(void); 431da177e4SLinus Torvalds static void befs_destroy_inodecache(void); 44008b150aSAl Viro static void *befs_follow_link(struct dentry *, struct nameidata *); 45008b150aSAl Viro static void befs_put_link(struct dentry *, struct nameidata *, void *); 461da177e4SLinus Torvalds static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, 471da177e4SLinus Torvalds char **out, int *out_len); 481da177e4SLinus Torvalds static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, 491da177e4SLinus Torvalds char **out, int *out_len); 501da177e4SLinus Torvalds static void befs_put_super(struct super_block *); 511da177e4SLinus Torvalds static int befs_remount(struct super_block *, int *, char *); 52726c3342SDavid Howells static int befs_statfs(struct dentry *, struct kstatfs *); 531da177e4SLinus Torvalds static int parse_options(char *, befs_mount_options *); 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds static const struct super_operations befs_sops = { 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, 61552c3c6cSMiklos Szeredi .show_options = generic_show_options, 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds /* slab cache for befs_inode_info objects */ 65e18b890bSChristoph Lameter static struct kmem_cache *befs_inode_cachep; 661da177e4SLinus Torvalds 674b6f5d20SArjan van de Ven static const struct file_operations befs_dir_operations = { 681da177e4SLinus Torvalds .read = generic_read_dir, 691da177e4SLinus Torvalds .readdir = befs_readdir, 7059af1584SAl Viro .llseek = generic_file_llseek, 711da177e4SLinus Torvalds }; 721da177e4SLinus Torvalds 73754661f1SArjan van de Ven static const struct inode_operations befs_dir_inode_operations = { 741da177e4SLinus Torvalds .lookup = befs_lookup, 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 77f5e54d6eSChristoph Hellwig static const struct address_space_operations befs_aops = { 781da177e4SLinus Torvalds .readpage = befs_readpage, 791da177e4SLinus Torvalds .bmap = befs_bmap, 801da177e4SLinus Torvalds }; 811da177e4SLinus Torvalds 82754661f1SArjan van de Ven static const struct inode_operations befs_symlink_inode_operations = { 831da177e4SLinus Torvalds .readlink = generic_readlink, 841da177e4SLinus Torvalds .follow_link = befs_follow_link, 851da177e4SLinus Torvalds .put_link = befs_put_link, 861da177e4SLinus Torvalds }; 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds /* 891da177e4SLinus Torvalds * Called by generic_file_read() to read a page of data 901da177e4SLinus Torvalds * 911da177e4SLinus Torvalds * In turn, simply calls a generic block read function and 921da177e4SLinus Torvalds * passes it the address of befs_get_block, for mapping file 931da177e4SLinus Torvalds * positions to disk blocks. 941da177e4SLinus Torvalds */ 951da177e4SLinus Torvalds static int 961da177e4SLinus Torvalds befs_readpage(struct file *file, struct page *page) 971da177e4SLinus Torvalds { 981da177e4SLinus Torvalds return block_read_full_page(page, befs_get_block); 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds static sector_t 1021da177e4SLinus Torvalds befs_bmap(struct address_space *mapping, sector_t block) 1031da177e4SLinus Torvalds { 1041da177e4SLinus Torvalds return generic_block_bmap(mapping, block, befs_get_block); 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /* 1081da177e4SLinus Torvalds * Generic function to map a file position (block) to a 1091da177e4SLinus Torvalds * disk offset (passed back in bh_result). 1101da177e4SLinus Torvalds * 1111da177e4SLinus Torvalds * Used by many higher level functions. 1121da177e4SLinus Torvalds * 1131da177e4SLinus Torvalds * Calls befs_fblock2brun() in datastream.c to do the real work. 1141da177e4SLinus Torvalds * 1151da177e4SLinus Torvalds * -WD 10-26-01 1161da177e4SLinus Torvalds */ 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds static int 1191da177e4SLinus Torvalds befs_get_block(struct inode *inode, sector_t block, 1201da177e4SLinus Torvalds struct buffer_head *bh_result, int create) 1211da177e4SLinus Torvalds { 1221da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 1231da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 1241da177e4SLinus Torvalds befs_block_run run = BAD_IADDR; 1251da177e4SLinus Torvalds int res = 0; 1261da177e4SLinus Torvalds ulong disk_off; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", 1291da177e4SLinus Torvalds inode->i_ino, block); 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds if (block < 0) { 1321da177e4SLinus Torvalds befs_error(sb, "befs_get_block() was asked for a block " 1331da177e4SLinus Torvalds "number less than zero: block %ld in inode %lu", 1341da177e4SLinus Torvalds block, inode->i_ino); 1351da177e4SLinus Torvalds return -EIO; 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds if (create) { 1391da177e4SLinus Torvalds befs_error(sb, "befs_get_block() was asked to write to " 1401da177e4SLinus Torvalds "block %ld in inode %lu", block, inode->i_ino); 1411da177e4SLinus Torvalds return -EPERM; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds res = befs_fblock2brun(sb, ds, block, &run); 1451da177e4SLinus Torvalds if (res != BEFS_OK) { 1461da177e4SLinus Torvalds befs_error(sb, 1471da177e4SLinus Torvalds "<--- befs_get_block() for inode %lu, block " 1481da177e4SLinus Torvalds "%ld ERROR", inode->i_ino, block); 1491da177e4SLinus Torvalds return -EFBIG; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds disk_off = (ulong) iaddr2blockno(sb, &run); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds map_bh(bh_result, inode->i_sb, disk_off); 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, " 1571da177e4SLinus Torvalds "disk address %lu", inode->i_ino, block, disk_off); 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds return 0; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static struct dentry * 16300cd8dd3SAl Viro befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds struct inode *inode = NULL; 1661da177e4SLinus Torvalds struct super_block *sb = dir->i_sb; 1671da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; 1681da177e4SLinus Torvalds befs_off_t offset; 1691da177e4SLinus Torvalds int ret; 1701da177e4SLinus Torvalds int utfnamelen; 1711da177e4SLinus Torvalds char *utfname; 1721da177e4SLinus Torvalds const char *name = dentry->d_name.name; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds befs_debug(sb, "---> befs_lookup() " 1751da177e4SLinus Torvalds "name %s inode %ld", dentry->d_name.name, dir->i_ino); 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* Convert to UTF-8 */ 1781da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 1791da177e4SLinus Torvalds ret = 1801da177e4SLinus Torvalds befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); 1811da177e4SLinus Torvalds if (ret < 0) { 1821da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup() ERROR"); 1831da177e4SLinus Torvalds return ERR_PTR(ret); 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, utfname, &offset); 1861da177e4SLinus Torvalds kfree(utfname); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds } else { 1891da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds if (ret == BEFS_BT_NOT_FOUND) { 1931da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup() %s not found", 1941da177e4SLinus Torvalds dentry->d_name.name); 1951da177e4SLinus Torvalds return ERR_PTR(-ENOENT); 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds } else if (ret != BEFS_OK || offset == 0) { 1981da177e4SLinus Torvalds befs_warning(sb, "<--- befs_lookup() Error"); 1991da177e4SLinus Torvalds return ERR_PTR(-ENODATA); 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 20296eb5419SDavid Howells inode = befs_iget(dir->i_sb, (ino_t) offset); 20396eb5419SDavid Howells if (IS_ERR(inode)) 20496eb5419SDavid Howells return ERR_CAST(inode); 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds d_add(dentry, inode); 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup()"); 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds return NULL; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds static int 2141da177e4SLinus Torvalds befs_readdir(struct file *filp, void *dirent, filldir_t filldir) 2151da177e4SLinus Torvalds { 21628f375fdSJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 2171da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 2181da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 2191da177e4SLinus Torvalds befs_off_t value; 2201da177e4SLinus Torvalds int result; 2211da177e4SLinus Torvalds size_t keysize; 2221da177e4SLinus Torvalds unsigned char d_type; 2231da177e4SLinus Torvalds char keybuf[BEFS_NAME_LEN + 1]; 2241da177e4SLinus Torvalds char *nlsname; 2251da177e4SLinus Torvalds int nlsnamelen; 22628f375fdSJosef Sipek const char *dirname = filp->f_path.dentry->d_name.name; 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds befs_debug(sb, "---> befs_readdir() " 2291da177e4SLinus Torvalds "name %s, inode %ld, filp->f_pos %Ld", 2301da177e4SLinus Torvalds dirname, inode->i_ino, filp->f_pos); 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1, 2331da177e4SLinus Torvalds keybuf, &keysize, &value); 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds if (result == BEFS_ERR) { 2361da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() ERROR"); 2371da177e4SLinus Torvalds befs_error(sb, "IO error reading %s (inode %lu)", 2381da177e4SLinus Torvalds dirname, inode->i_ino); 2391da177e4SLinus Torvalds return -EIO; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds } else if (result == BEFS_BT_END) { 2421da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() END"); 2431da177e4SLinus Torvalds return 0; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds } else if (result == BEFS_BT_EMPTY) { 2461da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() Empty directory"); 2471da177e4SLinus Torvalds return 0; 2481da177e4SLinus Torvalds } 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds d_type = DT_UNKNOWN; 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds /* Convert to NLS */ 2531da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 2541da177e4SLinus Torvalds result = 2551da177e4SLinus Torvalds befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); 2561da177e4SLinus Torvalds if (result < 0) { 2571da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() ERROR"); 2581da177e4SLinus Torvalds return result; 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos, 2611da177e4SLinus Torvalds (ino_t) value, d_type); 2621da177e4SLinus Torvalds kfree(nlsname); 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds } else { 2651da177e4SLinus Torvalds result = filldir(dirent, keybuf, keysize, filp->f_pos, 2661da177e4SLinus Torvalds (ino_t) value, d_type); 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds filp->f_pos++; 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos); 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds return 0; 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds static struct inode * 2771da177e4SLinus Torvalds befs_alloc_inode(struct super_block *sb) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds struct befs_inode_info *bi; 2801da177e4SLinus Torvalds bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, 281e94b1766SChristoph Lameter GFP_KERNEL); 2821da177e4SLinus Torvalds if (!bi) 2831da177e4SLinus Torvalds return NULL; 2841da177e4SLinus Torvalds return &bi->vfs_inode; 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 287fa0d7e3dSNick Piggin static void befs_i_callback(struct rcu_head *head) 2881da177e4SLinus Torvalds { 289fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 2901da177e4SLinus Torvalds kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 293fa0d7e3dSNick Piggin static void befs_destroy_inode(struct inode *inode) 294fa0d7e3dSNick Piggin { 295fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, befs_i_callback); 296fa0d7e3dSNick Piggin } 297fa0d7e3dSNick Piggin 29851cc5068SAlexey Dobriyan static void init_once(void *foo) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds struct befs_inode_info *bi = (struct befs_inode_info *) foo; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds 30596eb5419SDavid Howells static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 3061da177e4SLinus Torvalds { 3071da177e4SLinus Torvalds struct buffer_head *bh = NULL; 3081da177e4SLinus Torvalds befs_inode *raw_inode = NULL; 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds befs_sb_info *befs_sb = BEFS_SB(sb); 3111da177e4SLinus Torvalds befs_inode_info *befs_ino = NULL; 31296eb5419SDavid Howells struct inode *inode; 31396eb5419SDavid Howells long ret = -EIO; 3141da177e4SLinus Torvalds 31596eb5419SDavid Howells befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); 31696eb5419SDavid Howells 31796eb5419SDavid Howells inode = iget_locked(sb, ino); 31896eb5419SDavid Howells if (IS_ERR(inode)) 31996eb5419SDavid Howells return inode; 32096eb5419SDavid Howells if (!(inode->i_state & I_NEW)) 32196eb5419SDavid Howells return inode; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds befs_ino = BEFS_I(inode); 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds /* convert from vfs's inode number to befs's inode number */ 3261da177e4SLinus Torvalds befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds befs_debug(sb, " real inode number [%u, %hu, %hu]", 3291da177e4SLinus Torvalds befs_ino->i_inode_num.allocation_group, 3301da177e4SLinus Torvalds befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds bh = befs_bread(sb, inode->i_ino); 3331da177e4SLinus Torvalds if (!bh) { 3341da177e4SLinus Torvalds befs_error(sb, "unable to read inode block - " 3351da177e4SLinus Torvalds "inode = %lu", inode->i_ino); 3360418726bSAdrian Bunk goto unacquire_none; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds raw_inode = (befs_inode *) bh->b_data; 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds befs_dump_inode(sb, raw_inode); 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 3441da177e4SLinus Torvalds befs_error(sb, "Bad inode: %lu", inode->i_ino); 3450418726bSAdrian Bunk goto unacquire_bh; 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds /* 3511da177e4SLinus Torvalds * set uid and gid. But since current BeOS is single user OS, so 3521da177e4SLinus Torvalds * you can change by "uid" or "gid" options. 3531da177e4SLinus Torvalds */ 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds inode->i_uid = befs_sb->mount_opts.use_uid ? 35631aba059SEric W. Biederman befs_sb->mount_opts.uid : 35731aba059SEric W. Biederman make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); 3581da177e4SLinus Torvalds inode->i_gid = befs_sb->mount_opts.use_gid ? 35931aba059SEric W. Biederman befs_sb->mount_opts.gid : 36031aba059SEric W. Biederman make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); 3611da177e4SLinus Torvalds 362bfe86848SMiklos Szeredi set_nlink(inode, 1); 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds /* 3651da177e4SLinus Torvalds * BEFS's time is 64 bits, but current VFS is 32 bits... 3661da177e4SLinus Torvalds * BEFS don't have access time. Nor inode change time. VFS 3671da177e4SLinus Torvalds * doesn't have creation time. 3681da177e4SLinus Torvalds * Also, the lower 16 bits of the last_modified_time and 3691da177e4SLinus Torvalds * create_time are just a counter to help ensure uniqueness 3701da177e4SLinus Torvalds * for indexing purposes. (PFD, page 54) 3711da177e4SLinus Torvalds */ 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds inode->i_mtime.tv_sec = 3741da177e4SLinus Torvalds fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 3751da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 3761da177e4SLinus Torvalds inode->i_ctime = inode->i_mtime; 3771da177e4SLinus Torvalds inode->i_atime = inode->i_mtime; 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 3801da177e4SLinus Torvalds befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 3811da177e4SLinus Torvalds befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 3821da177e4SLinus Torvalds befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 3851da177e4SLinus Torvalds inode->i_size = 0; 3861da177e4SLinus Torvalds inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 3871da177e4SLinus Torvalds strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 3887df5fa06SDuane Griffin BEFS_SYMLINK_LEN - 1); 3897df5fa06SDuane Griffin befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; 3901da177e4SLinus Torvalds } else { 3911da177e4SLinus Torvalds int num_blks; 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds befs_ino->i_data.ds = 394e0e3d32bSJesper Juhl fsds_to_cpu(sb, &raw_inode->data.datastream); 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 3971da177e4SLinus Torvalds inode->i_blocks = 3981da177e4SLinus Torvalds num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 3991da177e4SLinus Torvalds inode->i_size = befs_ino->i_data.ds.size; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds inode->i_mapping->a_ops = &befs_aops; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds if (S_ISREG(inode->i_mode)) { 4052cf06916SChristoph Hellwig inode->i_fop = &generic_ro_fops; 4061da177e4SLinus Torvalds } else if (S_ISDIR(inode->i_mode)) { 4071da177e4SLinus Torvalds inode->i_op = &befs_dir_inode_operations; 4081da177e4SLinus Torvalds inode->i_fop = &befs_dir_operations; 4091da177e4SLinus Torvalds } else if (S_ISLNK(inode->i_mode)) { 4101da177e4SLinus Torvalds inode->i_op = &befs_symlink_inode_operations; 4111da177e4SLinus Torvalds } else { 4121da177e4SLinus Torvalds befs_error(sb, "Inode %lu is not a regular file, " 4131da177e4SLinus Torvalds "directory or symlink. THAT IS WRONG! BeFS has no " 4141da177e4SLinus Torvalds "on disk special files", inode->i_ino); 4150418726bSAdrian Bunk goto unacquire_bh; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds brelse(bh); 4191da177e4SLinus Torvalds befs_debug(sb, "<--- befs_read_inode()"); 42096eb5419SDavid Howells unlock_new_inode(inode); 42196eb5419SDavid Howells return inode; 4221da177e4SLinus Torvalds 4230418726bSAdrian Bunk unacquire_bh: 4241da177e4SLinus Torvalds brelse(bh); 4251da177e4SLinus Torvalds 4260418726bSAdrian Bunk unacquire_none: 42796eb5419SDavid Howells iget_failed(inode); 4281da177e4SLinus Torvalds befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 42996eb5419SDavid Howells return ERR_PTR(ret); 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds /* Initialize the inode cache. Called at fs setup. 4331da177e4SLinus Torvalds * 4341da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4351da177e4SLinus Torvalds */ 4361da177e4SLinus Torvalds static int 4371da177e4SLinus Torvalds befs_init_inodecache(void) 4381da177e4SLinus Torvalds { 4391da177e4SLinus Torvalds befs_inode_cachep = kmem_cache_create("befs_inode_cache", 4401da177e4SLinus Torvalds sizeof (struct befs_inode_info), 441fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 442fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 44320c2df83SPaul Mundt init_once); 4441da177e4SLinus Torvalds if (befs_inode_cachep == NULL) { 4451da177e4SLinus Torvalds printk(KERN_ERR "befs_init_inodecache: " 446421f91d2SUwe Kleine-König "Couldn't initialize inode slabcache\n"); 4471da177e4SLinus Torvalds return -ENOMEM; 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds return 0; 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds /* Called at fs teardown. 4541da177e4SLinus Torvalds * 4551da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4561da177e4SLinus Torvalds */ 4571da177e4SLinus Torvalds static void 4581da177e4SLinus Torvalds befs_destroy_inodecache(void) 4591da177e4SLinus Torvalds { 4601a1d92c1SAlexey Dobriyan kmem_cache_destroy(befs_inode_cachep); 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds /* 4641da177e4SLinus Torvalds * The inode of symbolic link is different to data stream. 4651da177e4SLinus Torvalds * The data stream become link name. Unless the LONG_SYMLINK 4661da177e4SLinus Torvalds * flag is set. 4671da177e4SLinus Torvalds */ 468db873896SLinus Torvalds static void * 4691da177e4SLinus Torvalds befs_follow_link(struct dentry *dentry, struct nameidata *nd) 4701da177e4SLinus Torvalds { 4711da177e4SLinus Torvalds befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 4721da177e4SLinus Torvalds char *link; 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 4751da177e4SLinus Torvalds struct super_block *sb = dentry->d_sb; 4761da177e4SLinus Torvalds befs_data_stream *data = &befs_ino->i_data.ds; 4771da177e4SLinus Torvalds befs_off_t len = data->size; 4781da177e4SLinus Torvalds 479338d0f0aSTimo Warns if (len == 0) { 480338d0f0aSTimo Warns befs_error(sb, "Long symlink with illegal length"); 481338d0f0aSTimo Warns link = ERR_PTR(-EIO); 482338d0f0aSTimo Warns } else { 4831da177e4SLinus Torvalds befs_debug(sb, "Follow long symlink"); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds link = kmalloc(len, GFP_NOFS); 4861da177e4SLinus Torvalds if (!link) { 4871da177e4SLinus Torvalds link = ERR_PTR(-ENOMEM); 4881da177e4SLinus Torvalds } else if (befs_read_lsymlink(sb, data, link, len) != len) { 4891da177e4SLinus Torvalds kfree(link); 4901da177e4SLinus Torvalds befs_error(sb, "Failed to read entire long symlink"); 4911da177e4SLinus Torvalds link = ERR_PTR(-EIO); 4927df5fa06SDuane Griffin } else { 4937df5fa06SDuane Griffin link[len - 1] = '\0'; 4941da177e4SLinus Torvalds } 495338d0f0aSTimo Warns } 4961da177e4SLinus Torvalds } else { 4971da177e4SLinus Torvalds link = befs_ino->i_data.symlink; 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds nd_set_link(nd, link); 501008b150aSAl Viro return NULL; 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds 504008b150aSAl Viro static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 5051da177e4SLinus Torvalds { 5061da177e4SLinus Torvalds befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 5071da177e4SLinus Torvalds if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 50863e3453eSHarvey Harrison char *link = nd_get_link(nd); 50963e3453eSHarvey Harrison if (!IS_ERR(link)) 51063e3453eSHarvey Harrison kfree(link); 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /* 5151da177e4SLinus Torvalds * UTF-8 to NLS charset convert routine 5161da177e4SLinus Torvalds * 5171da177e4SLinus Torvalds * 5181da177e4SLinus Torvalds * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 5191da177e4SLinus Torvalds * the nls tables directly 5201da177e4SLinus Torvalds */ 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds static int 5231da177e4SLinus Torvalds befs_utf2nls(struct super_block *sb, const char *in, 5241da177e4SLinus Torvalds int in_len, char **out, int *out_len) 5251da177e4SLinus Torvalds { 5261da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 5271da177e4SLinus Torvalds int i, o; 52874675a58SAlan Stern unicode_t uni; 5291da177e4SLinus Torvalds int unilen, utflen; 5301da177e4SLinus Torvalds char *result; 53194f563c4SDiego Calleja /* The utf8->nls conversion won't make the final nls string bigger 53294f563c4SDiego Calleja * than the utf one, but if the string is pure ascii they'll have the 53394f563c4SDiego Calleja * same width and an extra char is needed to save the additional \0 53494f563c4SDiego Calleja */ 53594f563c4SDiego Calleja int maxlen = in_len + 1; 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds befs_debug(sb, "---> utf2nls()"); 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds if (!nls) { 5401da177e4SLinus Torvalds befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 5411da177e4SLinus Torvalds return -EINVAL; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 5451da177e4SLinus Torvalds if (!*out) { 5461da177e4SLinus Torvalds befs_error(sb, "befs_utf2nls() cannot allocate memory"); 5471da177e4SLinus Torvalds *out_len = 0; 5481da177e4SLinus Torvalds return -ENOMEM; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += utflen, o += unilen) { 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds /* convert from UTF-8 to Unicode */ 55474675a58SAlan Stern utflen = utf8_to_utf32(&in[i], in_len - i, &uni); 55574675a58SAlan Stern if (utflen < 0) 5561da177e4SLinus Torvalds goto conv_err; 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds /* convert from Unicode to nls */ 55974675a58SAlan Stern if (uni > MAX_WCHAR_T) 5601da177e4SLinus Torvalds goto conv_err; 56174675a58SAlan Stern unilen = nls->uni2char(uni, &result[o], in_len - o); 56274675a58SAlan Stern if (unilen < 0) 56374675a58SAlan Stern goto conv_err; 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds result[o] = '\0'; 5661da177e4SLinus Torvalds *out_len = o; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds befs_debug(sb, "<--- utf2nls()"); 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds return o; 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds conv_err: 5731da177e4SLinus Torvalds befs_error(sb, "Name using character set %s contains a character that " 5741da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 5751da177e4SLinus Torvalds befs_debug(sb, "<--- utf2nls()"); 5761da177e4SLinus Torvalds kfree(result); 5771da177e4SLinus Torvalds return -EILSEQ; 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds /** 5811da177e4SLinus Torvalds * befs_nls2utf - Convert NLS string to utf8 encodeing 5821da177e4SLinus Torvalds * @sb: Superblock 5831da177e4SLinus Torvalds * @src: Input string buffer in NLS format 5841da177e4SLinus Torvalds * @srclen: Length of input string in bytes 5854de151d8SAlexey Dobriyan * @dest: The output string in UTF-8 format 5861da177e4SLinus Torvalds * @destlen: Length of the output buffer 5871da177e4SLinus Torvalds * 5881da177e4SLinus Torvalds * Converts input string @src, which is in the format of the loaded NLS map, 5891da177e4SLinus Torvalds * into a utf8 string. 5901da177e4SLinus Torvalds * 5911da177e4SLinus Torvalds * The destination string @dest is allocated by this function and the caller is 5921da177e4SLinus Torvalds * responsible for freeing it with kfree() 5931da177e4SLinus Torvalds * 5941da177e4SLinus Torvalds * On return, *@destlen is the length of @dest in bytes. 5951da177e4SLinus Torvalds * 5961da177e4SLinus Torvalds * On success, the return value is the number of utf8 characters written to 5971da177e4SLinus Torvalds * the output buffer @dest. 5981da177e4SLinus Torvalds * 5991da177e4SLinus Torvalds * On Failure, a negative number coresponding to the error code is returned. 6001da177e4SLinus Torvalds */ 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds static int 6031da177e4SLinus Torvalds befs_nls2utf(struct super_block *sb, const char *in, 6041da177e4SLinus Torvalds int in_len, char **out, int *out_len) 6051da177e4SLinus Torvalds { 6061da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 6071da177e4SLinus Torvalds int i, o; 6081da177e4SLinus Torvalds wchar_t uni; 6091da177e4SLinus Torvalds int unilen, utflen; 6101da177e4SLinus Torvalds char *result; 61194f563c4SDiego Calleja /* There're nls characters that will translate to 3-chars-wide UTF-8 61294f563c4SDiego Calleja * characters, a additional byte is needed to save the final \0 61394f563c4SDiego Calleja * in special cases */ 61494f563c4SDiego Calleja int maxlen = (3 * in_len) + 1; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds befs_debug(sb, "---> nls2utf()\n"); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds if (!nls) { 6191da177e4SLinus Torvalds befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 6201da177e4SLinus Torvalds return -EINVAL; 6211da177e4SLinus Torvalds } 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 6241da177e4SLinus Torvalds if (!*out) { 6251da177e4SLinus Torvalds befs_error(sb, "befs_nls2utf() cannot allocate memory"); 6261da177e4SLinus Torvalds *out_len = 0; 6271da177e4SLinus Torvalds return -ENOMEM; 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += unilen, o += utflen) { 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /* convert from nls to unicode */ 6331da177e4SLinus Torvalds unilen = nls->char2uni(&in[i], in_len - i, &uni); 63474675a58SAlan Stern if (unilen < 0) 6351da177e4SLinus Torvalds goto conv_err; 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds /* convert from unicode to UTF-8 */ 63874675a58SAlan Stern utflen = utf32_to_utf8(uni, &result[o], 3); 63974675a58SAlan Stern if (utflen <= 0) 6401da177e4SLinus Torvalds goto conv_err; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds result[o] = '\0'; 6441da177e4SLinus Torvalds *out_len = o; 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds befs_debug(sb, "<--- nls2utf()"); 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds return i; 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds conv_err: 6511da177e4SLinus Torvalds befs_error(sb, "Name using charecter set %s contains a charecter that " 6521da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 6531da177e4SLinus Torvalds befs_debug(sb, "<--- nls2utf()"); 6541da177e4SLinus Torvalds kfree(result); 6551da177e4SLinus Torvalds return -EILSEQ; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds /** 6591da177e4SLinus Torvalds * Use the 6601da177e4SLinus Torvalds * 6611da177e4SLinus Torvalds */ 6621da177e4SLinus Torvalds enum { 6631da177e4SLinus Torvalds Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 6641da177e4SLinus Torvalds }; 6651da177e4SLinus Torvalds 666a447c093SSteven Whitehouse static const match_table_t befs_tokens = { 6671da177e4SLinus Torvalds {Opt_uid, "uid=%d"}, 6681da177e4SLinus Torvalds {Opt_gid, "gid=%d"}, 6691da177e4SLinus Torvalds {Opt_charset, "iocharset=%s"}, 6701da177e4SLinus Torvalds {Opt_debug, "debug"}, 6711da177e4SLinus Torvalds {Opt_err, NULL} 6721da177e4SLinus Torvalds }; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds static int 6751da177e4SLinus Torvalds parse_options(char *options, befs_mount_options * opts) 6761da177e4SLinus Torvalds { 6771da177e4SLinus Torvalds char *p; 6781da177e4SLinus Torvalds substring_t args[MAX_OPT_ARGS]; 6791da177e4SLinus Torvalds int option; 68031aba059SEric W. Biederman kuid_t uid; 68131aba059SEric W. Biederman kgid_t gid; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* Initialize options */ 68431aba059SEric W. Biederman opts->uid = GLOBAL_ROOT_UID; 68531aba059SEric W. Biederman opts->gid = GLOBAL_ROOT_GID; 6861da177e4SLinus Torvalds opts->use_uid = 0; 6871da177e4SLinus Torvalds opts->use_gid = 0; 6881da177e4SLinus Torvalds opts->iocharset = NULL; 6891da177e4SLinus Torvalds opts->debug = 0; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds if (!options) 6921da177e4SLinus Torvalds return 1; 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds while ((p = strsep(&options, ",")) != NULL) { 6951da177e4SLinus Torvalds int token; 6961da177e4SLinus Torvalds if (!*p) 6971da177e4SLinus Torvalds continue; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds token = match_token(p, befs_tokens, args); 7001da177e4SLinus Torvalds switch (token) { 7011da177e4SLinus Torvalds case Opt_uid: 7021da177e4SLinus Torvalds if (match_int(&args[0], &option)) 7031da177e4SLinus Torvalds return 0; 70431aba059SEric W. Biederman uid = INVALID_UID; 70531aba059SEric W. Biederman if (option >= 0) 70631aba059SEric W. Biederman uid = make_kuid(current_user_ns(), option); 70731aba059SEric W. Biederman if (!uid_valid(uid)) { 7081da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Invalid uid %d, " 7091da177e4SLinus Torvalds "using default\n", option); 7101da177e4SLinus Torvalds break; 7111da177e4SLinus Torvalds } 71231aba059SEric W. Biederman opts->uid = uid; 7131da177e4SLinus Torvalds opts->use_uid = 1; 7141da177e4SLinus Torvalds break; 7151da177e4SLinus Torvalds case Opt_gid: 7161da177e4SLinus Torvalds if (match_int(&args[0], &option)) 7171da177e4SLinus Torvalds return 0; 71831aba059SEric W. Biederman gid = INVALID_GID; 71931aba059SEric W. Biederman if (option >= 0) 72031aba059SEric W. Biederman gid = make_kgid(current_user_ns(), option); 72131aba059SEric W. Biederman if (!gid_valid(gid)) { 7221da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Invalid gid %d, " 7231da177e4SLinus Torvalds "using default\n", option); 7241da177e4SLinus Torvalds break; 7251da177e4SLinus Torvalds } 72631aba059SEric W. Biederman opts->gid = gid; 7271da177e4SLinus Torvalds opts->use_gid = 1; 7281da177e4SLinus Torvalds break; 7291da177e4SLinus Torvalds case Opt_charset: 7301da177e4SLinus Torvalds kfree(opts->iocharset); 7311da177e4SLinus Torvalds opts->iocharset = match_strdup(&args[0]); 7321da177e4SLinus Torvalds if (!opts->iocharset) { 7331da177e4SLinus Torvalds printk(KERN_ERR "BeFS: allocation failure for " 7341da177e4SLinus Torvalds "iocharset string\n"); 7351da177e4SLinus Torvalds return 0; 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds break; 7381da177e4SLinus Torvalds case Opt_debug: 7391da177e4SLinus Torvalds opts->debug = 1; 7401da177e4SLinus Torvalds break; 7411da177e4SLinus Torvalds default: 7421da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 7431da177e4SLinus Torvalds "or missing value\n", p); 7441da177e4SLinus Torvalds return 0; 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds return 1; 7481da177e4SLinus Torvalds } 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds /* This function has the responsibiltiy of getting the 7511da177e4SLinus Torvalds * filesystem ready for unmounting. 75225985edcSLucas De Marchi * Basically, we free everything that we allocated in 7531da177e4SLinus Torvalds * befs_read_inode 7541da177e4SLinus Torvalds */ 7551da177e4SLinus Torvalds static void 7561da177e4SLinus Torvalds befs_put_super(struct super_block *sb) 7571da177e4SLinus Torvalds { 7581da177e4SLinus Torvalds kfree(BEFS_SB(sb)->mount_opts.iocharset); 7591da177e4SLinus Torvalds BEFS_SB(sb)->mount_opts.iocharset = NULL; 7601da177e4SLinus Torvalds unload_nls(BEFS_SB(sb)->nls); 7611da177e4SLinus Torvalds kfree(sb->s_fs_info); 7621da177e4SLinus Torvalds sb->s_fs_info = NULL; 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /* Allocate private field of the superblock, fill it. 7661da177e4SLinus Torvalds * 7671da177e4SLinus Torvalds * Finish filling the public superblock fields 7681da177e4SLinus Torvalds * Make the root directory 7691da177e4SLinus Torvalds * Load a set of NLS translations if needed. 7701da177e4SLinus Torvalds */ 7711da177e4SLinus Torvalds static int 7721da177e4SLinus Torvalds befs_fill_super(struct super_block *sb, void *data, int silent) 7731da177e4SLinus Torvalds { 7741da177e4SLinus Torvalds struct buffer_head *bh; 7751da177e4SLinus Torvalds befs_sb_info *befs_sb; 7761da177e4SLinus Torvalds befs_super_block *disk_sb; 7771da177e4SLinus Torvalds struct inode *root; 77896eb5419SDavid Howells long ret = -EINVAL; 7791da177e4SLinus Torvalds const unsigned long sb_block = 0; 7801da177e4SLinus Torvalds const off_t x86_sb_off = 512; 7811da177e4SLinus Torvalds 782552c3c6cSMiklos Szeredi save_mount_options(sb, data); 783552c3c6cSMiklos Szeredi 7841da177e4SLinus Torvalds sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 7851da177e4SLinus Torvalds if (sb->s_fs_info == NULL) { 7861da177e4SLinus Torvalds printk(KERN_ERR 7871da177e4SLinus Torvalds "BeFS(%s): Unable to allocate memory for private " 7881da177e4SLinus Torvalds "portion of superblock. Bailing.\n", sb->s_id); 7890418726bSAdrian Bunk goto unacquire_none; 7901da177e4SLinus Torvalds } 7911da177e4SLinus Torvalds befs_sb = BEFS_SB(sb); 7921da177e4SLinus Torvalds memset(befs_sb, 0, sizeof(befs_sb_info)); 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds if (!parse_options((char *) data, &befs_sb->mount_opts)) { 7951da177e4SLinus Torvalds befs_error(sb, "cannot parse mount options"); 7960418726bSAdrian Bunk goto unacquire_priv_sbp; 7971da177e4SLinus Torvalds } 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds befs_debug(sb, "---> befs_fill_super()"); 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds #ifndef CONFIG_BEFS_RW 8021da177e4SLinus Torvalds if (!(sb->s_flags & MS_RDONLY)) { 8031da177e4SLinus Torvalds befs_warning(sb, 8041da177e4SLinus Torvalds "No write support. Marking filesystem read-only"); 8051da177e4SLinus Torvalds sb->s_flags |= MS_RDONLY; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds #endif /* CONFIG_BEFS_RW */ 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds /* 8101da177e4SLinus Torvalds * Set dummy blocksize to read super block. 8111da177e4SLinus Torvalds * Will be set to real fs blocksize later. 8121da177e4SLinus Torvalds * 8131da177e4SLinus Torvalds * Linux 2.4.10 and later refuse to read blocks smaller than 8141da177e4SLinus Torvalds * the hardsect size for the device. But we also need to read at 8151da177e4SLinus Torvalds * least 1k to get the second 512 bytes of the volume. 8161da177e4SLinus Torvalds * -WD 10-26-01 8171da177e4SLinus Torvalds */ 8181da177e4SLinus Torvalds sb_min_blocksize(sb, 1024); 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds if (!(bh = sb_bread(sb, sb_block))) { 8211da177e4SLinus Torvalds befs_error(sb, "unable to read superblock"); 8220418726bSAdrian Bunk goto unacquire_priv_sbp; 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds /* account for offset of super block on x86 */ 8261da177e4SLinus Torvalds disk_sb = (befs_super_block *) bh->b_data; 827152b95a1SHarvey Harrison if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 828152b95a1SHarvey Harrison (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 8291da177e4SLinus Torvalds befs_debug(sb, "Using PPC superblock location"); 8301da177e4SLinus Torvalds } else { 8311da177e4SLinus Torvalds befs_debug(sb, "Using x86 superblock location"); 8321da177e4SLinus Torvalds disk_sb = 8331da177e4SLinus Torvalds (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 8341da177e4SLinus Torvalds } 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds if (befs_load_sb(sb, disk_sb) != BEFS_OK) 8370418726bSAdrian Bunk goto unacquire_bh; 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds befs_dump_super_block(sb, disk_sb); 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds brelse(bh); 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds if (befs_check_sb(sb) != BEFS_OK) 8440418726bSAdrian Bunk goto unacquire_priv_sbp; 8451da177e4SLinus Torvalds 8461da177e4SLinus Torvalds if( befs_sb->num_blocks > ~((sector_t)0) ) { 8471da177e4SLinus Torvalds befs_error(sb, "blocks count: %Lu " 8481da177e4SLinus Torvalds "is larger than the host can use", 8491da177e4SLinus Torvalds befs_sb->num_blocks); 8500418726bSAdrian Bunk goto unacquire_priv_sbp; 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds /* 8541da177e4SLinus Torvalds * set up enough so that it can read an inode 8551da177e4SLinus Torvalds * Fill in kernel superblock fields from private sb 8561da177e4SLinus Torvalds */ 8571da177e4SLinus Torvalds sb->s_magic = BEFS_SUPER_MAGIC; 8581da177e4SLinus Torvalds /* Set real blocksize of fs */ 8591da177e4SLinus Torvalds sb_set_blocksize(sb, (ulong) befs_sb->block_size); 860b87221deSAlexey Dobriyan sb->s_op = &befs_sops; 86196eb5419SDavid Howells root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 86296eb5419SDavid Howells if (IS_ERR(root)) { 86396eb5419SDavid Howells ret = PTR_ERR(root); 86496eb5419SDavid Howells goto unacquire_priv_sbp; 86596eb5419SDavid Howells } 86648fde701SAl Viro sb->s_root = d_make_root(root); 8671da177e4SLinus Torvalds if (!sb->s_root) { 8681da177e4SLinus Torvalds befs_error(sb, "get root inode failed"); 8690418726bSAdrian Bunk goto unacquire_priv_sbp; 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds /* load nls library */ 8731da177e4SLinus Torvalds if (befs_sb->mount_opts.iocharset) { 8741da177e4SLinus Torvalds befs_debug(sb, "Loading nls: %s", 8751da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8761da177e4SLinus Torvalds befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 8771da177e4SLinus Torvalds if (!befs_sb->nls) { 8781da177e4SLinus Torvalds befs_warning(sb, "Cannot load nls %s" 8791da177e4SLinus Torvalds " loading default nls", 8801da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8811da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8821da177e4SLinus Torvalds } 8831da177e4SLinus Torvalds /* load default nls if none is specified in mount options */ 8841da177e4SLinus Torvalds } else { 8851da177e4SLinus Torvalds befs_debug(sb, "Loading default nls"); 8861da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8871da177e4SLinus Torvalds } 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds return 0; 8901da177e4SLinus Torvalds /*****************/ 8910418726bSAdrian Bunk unacquire_bh: 8921da177e4SLinus Torvalds brelse(bh); 8931da177e4SLinus Torvalds 8940418726bSAdrian Bunk unacquire_priv_sbp: 8958dd5ca53SAl Viro kfree(befs_sb->mount_opts.iocharset); 8961da177e4SLinus Torvalds kfree(sb->s_fs_info); 8971da177e4SLinus Torvalds 8980418726bSAdrian Bunk unacquire_none: 8991da177e4SLinus Torvalds sb->s_fs_info = NULL; 90096eb5419SDavid Howells return ret; 9011da177e4SLinus Torvalds } 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds static int 9041da177e4SLinus Torvalds befs_remount(struct super_block *sb, int *flags, char *data) 9051da177e4SLinus Torvalds { 9061da177e4SLinus Torvalds if (!(*flags & MS_RDONLY)) 9071da177e4SLinus Torvalds return -EINVAL; 9081da177e4SLinus Torvalds return 0; 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds static int 912726c3342SDavid Howells befs_statfs(struct dentry *dentry, struct kstatfs *buf) 9131da177e4SLinus Torvalds { 914726c3342SDavid Howells struct super_block *sb = dentry->d_sb; 9158587246aSColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds befs_debug(sb, "---> befs_statfs()"); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds buf->f_type = BEFS_SUPER_MAGIC; 9201da177e4SLinus Torvalds buf->f_bsize = sb->s_blocksize; 9211da177e4SLinus Torvalds buf->f_blocks = BEFS_SB(sb)->num_blocks; 9221da177e4SLinus Torvalds buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 9231da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree; 9241da177e4SLinus Torvalds buf->f_files = 0; /* UNKNOWN */ 9251da177e4SLinus Torvalds buf->f_ffree = 0; /* UNKNOWN */ 9268587246aSColy Li buf->f_fsid.val[0] = (u32)id; 9278587246aSColy Li buf->f_fsid.val[1] = (u32)(id >> 32); 9281da177e4SLinus Torvalds buf->f_namelen = BEFS_NAME_LEN; 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds befs_debug(sb, "<--- befs_statfs()"); 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds return 0; 9331da177e4SLinus Torvalds } 9341da177e4SLinus Torvalds 935152a0836SAl Viro static struct dentry * 936152a0836SAl Viro befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, 937152a0836SAl Viro void *data) 9381da177e4SLinus Torvalds { 939152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); 9401da177e4SLinus Torvalds } 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds static struct file_system_type befs_fs_type = { 9431da177e4SLinus Torvalds .owner = THIS_MODULE, 9441da177e4SLinus Torvalds .name = "befs", 945152a0836SAl Viro .mount = befs_mount, 9461da177e4SLinus Torvalds .kill_sb = kill_block_super, 9471da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 9481da177e4SLinus Torvalds }; 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds static int __init 9511da177e4SLinus Torvalds init_befs_fs(void) 9521da177e4SLinus Torvalds { 9531da177e4SLinus Torvalds int err; 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds err = befs_init_inodecache(); 9581da177e4SLinus Torvalds if (err) 9590418726bSAdrian Bunk goto unacquire_none; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds err = register_filesystem(&befs_fs_type); 9621da177e4SLinus Torvalds if (err) 9630418726bSAdrian Bunk goto unacquire_inodecache; 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds return 0; 9661da177e4SLinus Torvalds 9670418726bSAdrian Bunk unacquire_inodecache: 9681da177e4SLinus Torvalds befs_destroy_inodecache(); 9691da177e4SLinus Torvalds 9700418726bSAdrian Bunk unacquire_none: 9711da177e4SLinus Torvalds return err; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds static void __exit 9751da177e4SLinus Torvalds exit_befs_fs(void) 9761da177e4SLinus Torvalds { 9771da177e4SLinus Torvalds befs_destroy_inodecache(); 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds unregister_filesystem(&befs_fs_type); 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds /* 9831da177e4SLinus Torvalds Macros that typecheck the init and exit functions, 9841da177e4SLinus Torvalds ensures that they are called at init and cleanup, 9851da177e4SLinus Torvalds and eliminates warnings about unused functions. 9861da177e4SLinus Torvalds */ 9871da177e4SLinus Torvalds module_init(init_befs_fs) 9881da177e4SLinus Torvalds module_exit(exit_befs_fs) 989