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 8dac52fc1SFabian Frederick #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9dac52fc1SFabian Frederick 101da177e4SLinus Torvalds #include <linux/module.h> 111da177e4SLinus Torvalds #include <linux/slab.h> 121da177e4SLinus Torvalds #include <linux/fs.h> 131da177e4SLinus Torvalds #include <linux/errno.h> 141da177e4SLinus Torvalds #include <linux/stat.h> 151da177e4SLinus Torvalds #include <linux/nls.h> 161da177e4SLinus Torvalds #include <linux/buffer_head.h> 171da177e4SLinus Torvalds #include <linux/vfs.h> 181da177e4SLinus Torvalds #include <linux/parser.h> 191da177e4SLinus Torvalds #include <linux/namei.h> 2031aba059SEric W. Biederman #include <linux/sched.h> 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include "befs.h" 231da177e4SLinus Torvalds #include "btree.h" 241da177e4SLinus Torvalds #include "inode.h" 251da177e4SLinus Torvalds #include "datastream.h" 261da177e4SLinus Torvalds #include "super.h" 271da177e4SLinus Torvalds #include "io.h" 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); 301da177e4SLinus Torvalds MODULE_AUTHOR("Will Dyson"); 311da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds /* The units the vfs expects inode->i_blocks to be in */ 341da177e4SLinus Torvalds #define VFS_BLOCK_SIZE 512 351da177e4SLinus Torvalds 36f0f49ef5SAl Viro static int befs_readdir(struct file *, struct dir_context *); 371da177e4SLinus Torvalds static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); 381da177e4SLinus Torvalds static int befs_readpage(struct file *file, struct page *page); 391da177e4SLinus Torvalds static sector_t befs_bmap(struct address_space *mapping, sector_t block); 4000cd8dd3SAl Viro static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); 4196eb5419SDavid Howells static struct inode *befs_iget(struct super_block *, unsigned long); 421da177e4SLinus Torvalds static struct inode *befs_alloc_inode(struct super_block *sb); 431da177e4SLinus Torvalds static void befs_destroy_inode(struct inode *inode); 441da177e4SLinus Torvalds static void befs_destroy_inodecache(void); 45008b150aSAl Viro static void *befs_follow_link(struct dentry *, struct nameidata *); 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 *); 5309ad0eaeSFabian Frederick static int parse_options(char *, struct 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, 69f0f49ef5SAl Viro .iterate = 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, 8548bc06e7SAl Viro .put_link = kfree_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", 129dac52fc1SFabian Frederick (unsigned long)inode->i_ino, (long)block); 1301da177e4SLinus Torvalds if (create) { 1311da177e4SLinus Torvalds befs_error(sb, "befs_get_block() was asked to write to " 132dac52fc1SFabian Frederick "block %ld in inode %lu", (long)block, 133dac52fc1SFabian Frederick (unsigned long)inode->i_ino); 1341da177e4SLinus Torvalds return -EPERM; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds res = befs_fblock2brun(sb, ds, block, &run); 1381da177e4SLinus Torvalds if (res != BEFS_OK) { 1391da177e4SLinus Torvalds befs_error(sb, 140dac52fc1SFabian Frederick "<--- %s for inode %lu, block %ld ERROR", 141dac52fc1SFabian Frederick __func__, (unsigned long)inode->i_ino, 142dac52fc1SFabian Frederick (long)block); 1431da177e4SLinus Torvalds return -EFBIG; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds disk_off = (ulong) iaddr2blockno(sb, &run); 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds map_bh(bh_result, inode->i_sb, disk_off); 1491da177e4SLinus Torvalds 150dac52fc1SFabian Frederick befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", 151dac52fc1SFabian Frederick __func__, (unsigned long)inode->i_ino, (long)block, 152dac52fc1SFabian Frederick (unsigned long)disk_off); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds return 0; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds static struct dentry * 15800cd8dd3SAl Viro befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds struct inode *inode = NULL; 1611da177e4SLinus Torvalds struct super_block *sb = dir->i_sb; 1621da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; 1631da177e4SLinus Torvalds befs_off_t offset; 1641da177e4SLinus Torvalds int ret; 1651da177e4SLinus Torvalds int utfnamelen; 1661da177e4SLinus Torvalds char *utfname; 1671da177e4SLinus Torvalds const char *name = dentry->d_name.name; 1681da177e4SLinus Torvalds 169a455589fSAl Viro befs_debug(sb, "---> %s name %pd inode %ld", __func__, 170a455589fSAl Viro dentry, dir->i_ino); 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds /* Convert to UTF-8 */ 1731da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 1741da177e4SLinus Torvalds ret = 1751da177e4SLinus Torvalds befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); 1761da177e4SLinus Torvalds if (ret < 0) { 177dac52fc1SFabian Frederick befs_debug(sb, "<--- %s ERROR", __func__); 1781da177e4SLinus Torvalds return ERR_PTR(ret); 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, utfname, &offset); 1811da177e4SLinus Torvalds kfree(utfname); 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds } else { 1841da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds if (ret == BEFS_BT_NOT_FOUND) { 188a455589fSAl Viro befs_debug(sb, "<--- %s %pd not found", __func__, dentry); 1891da177e4SLinus Torvalds return ERR_PTR(-ENOENT); 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds } else if (ret != BEFS_OK || offset == 0) { 192dac52fc1SFabian Frederick befs_warning(sb, "<--- %s Error", __func__); 1931da177e4SLinus Torvalds return ERR_PTR(-ENODATA); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 19696eb5419SDavid Howells inode = befs_iget(dir->i_sb, (ino_t) offset); 19796eb5419SDavid Howells if (IS_ERR(inode)) 19896eb5419SDavid Howells return ERR_CAST(inode); 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds d_add(dentry, inode); 2011da177e4SLinus Torvalds 202dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__); 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds return NULL; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds static int 208f0f49ef5SAl Viro befs_readdir(struct file *file, struct dir_context *ctx) 2091da177e4SLinus Torvalds { 210f0f49ef5SAl Viro struct inode *inode = file_inode(file); 2111da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 2121da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 2131da177e4SLinus Torvalds befs_off_t value; 2141da177e4SLinus Torvalds int result; 2151da177e4SLinus Torvalds size_t keysize; 2161da177e4SLinus Torvalds unsigned char d_type; 2171da177e4SLinus Torvalds char keybuf[BEFS_NAME_LEN + 1]; 2181da177e4SLinus Torvalds 219a455589fSAl Viro befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld", 220a455589fSAl Viro __func__, file, inode->i_ino, ctx->pos); 2211da177e4SLinus Torvalds 222f0f49ef5SAl Viro more: 223f0f49ef5SAl Viro result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, 2241da177e4SLinus Torvalds keybuf, &keysize, &value); 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds if (result == BEFS_ERR) { 227dac52fc1SFabian Frederick befs_debug(sb, "<--- %s ERROR", __func__); 228a455589fSAl Viro befs_error(sb, "IO error reading %pD (inode %lu)", 229a455589fSAl Viro file, inode->i_ino); 2301da177e4SLinus Torvalds return -EIO; 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds } else if (result == BEFS_BT_END) { 233dac52fc1SFabian Frederick befs_debug(sb, "<--- %s END", __func__); 2341da177e4SLinus Torvalds return 0; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds } else if (result == BEFS_BT_EMPTY) { 237dac52fc1SFabian Frederick befs_debug(sb, "<--- %s Empty directory", __func__); 2381da177e4SLinus Torvalds return 0; 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds d_type = DT_UNKNOWN; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds /* Convert to NLS */ 2441da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 245f0f49ef5SAl Viro char *nlsname; 246f0f49ef5SAl Viro int nlsnamelen; 2471da177e4SLinus Torvalds result = 2481da177e4SLinus Torvalds befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); 2491da177e4SLinus Torvalds if (result < 0) { 250dac52fc1SFabian Frederick befs_debug(sb, "<--- %s ERROR", __func__); 2511da177e4SLinus Torvalds return result; 2521da177e4SLinus Torvalds } 253f0f49ef5SAl Viro if (!dir_emit(ctx, nlsname, nlsnamelen, 254f0f49ef5SAl Viro (ino_t) value, d_type)) { 2551da177e4SLinus Torvalds kfree(nlsname); 256f0f49ef5SAl Viro return 0; 2571da177e4SLinus Torvalds } 258f0f49ef5SAl Viro kfree(nlsname); 259f0f49ef5SAl Viro } else { 260f0f49ef5SAl Viro if (!dir_emit(ctx, keybuf, keysize, 261f0f49ef5SAl Viro (ino_t) value, d_type)) 262f0f49ef5SAl Viro return 0; 263f0f49ef5SAl Viro } 264f0f49ef5SAl Viro ctx->pos++; 265f0f49ef5SAl Viro goto more; 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds static struct inode * 2691da177e4SLinus Torvalds befs_alloc_inode(struct super_block *sb) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds struct befs_inode_info *bi; 272111d639dSFabian Frederick 273111d639dSFabian Frederick bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); 2741da177e4SLinus Torvalds if (!bi) 2751da177e4SLinus Torvalds return NULL; 2761da177e4SLinus Torvalds return &bi->vfs_inode; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 279fa0d7e3dSNick Piggin static void befs_i_callback(struct rcu_head *head) 2801da177e4SLinus Torvalds { 281fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 2821da177e4SLinus Torvalds kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 285fa0d7e3dSNick Piggin static void befs_destroy_inode(struct inode *inode) 286fa0d7e3dSNick Piggin { 287fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, befs_i_callback); 288fa0d7e3dSNick Piggin } 289fa0d7e3dSNick Piggin 29051cc5068SAlexey Dobriyan static void init_once(void *foo) 2911da177e4SLinus Torvalds { 2921da177e4SLinus Torvalds struct befs_inode_info *bi = (struct befs_inode_info *) foo; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 29796eb5419SDavid Howells static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 2981da177e4SLinus Torvalds { 2991da177e4SLinus Torvalds struct buffer_head *bh = NULL; 3001da177e4SLinus Torvalds befs_inode *raw_inode = NULL; 301038428fcSFabian Frederick struct befs_sb_info *befs_sb = BEFS_SB(sb); 302f8ccad21SFabian Frederick struct befs_inode_info *befs_ino = NULL; 30396eb5419SDavid Howells struct inode *inode; 30496eb5419SDavid Howells long ret = -EIO; 3051da177e4SLinus Torvalds 306dac52fc1SFabian Frederick befs_debug(sb, "---> %s inode = %lu", __func__, ino); 30796eb5419SDavid Howells 30896eb5419SDavid Howells inode = iget_locked(sb, ino); 309ac34a1b3SRakesh Pandit if (!inode) 310ac34a1b3SRakesh Pandit return ERR_PTR(-ENOMEM); 31196eb5419SDavid Howells if (!(inode->i_state & I_NEW)) 31296eb5419SDavid Howells return inode; 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 ? 34731aba059SEric W. Biederman befs_sb->mount_opts.uid : 34831aba059SEric W. Biederman make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); 3491da177e4SLinus Torvalds inode->i_gid = befs_sb->mount_opts.use_gid ? 35031aba059SEric W. Biederman befs_sb->mount_opts.gid : 35131aba059SEric W. Biederman make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); 3521da177e4SLinus Torvalds 353bfe86848SMiklos Szeredi set_nlink(inode, 1); 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* 3561da177e4SLinus Torvalds * BEFS's time is 64 bits, but current VFS is 32 bits... 3571da177e4SLinus Torvalds * BEFS don't have access time. Nor inode change time. VFS 3581da177e4SLinus Torvalds * doesn't have creation time. 3591da177e4SLinus Torvalds * Also, the lower 16 bits of the last_modified_time and 3601da177e4SLinus Torvalds * create_time are just a counter to help ensure uniqueness 3611da177e4SLinus Torvalds * for indexing purposes. (PFD, page 54) 3621da177e4SLinus Torvalds */ 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds inode->i_mtime.tv_sec = 3651da177e4SLinus Torvalds fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 3661da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 3671da177e4SLinus Torvalds inode->i_ctime = inode->i_mtime; 3681da177e4SLinus Torvalds inode->i_atime = inode->i_mtime; 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 3711da177e4SLinus Torvalds befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 3721da177e4SLinus Torvalds befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 3731da177e4SLinus Torvalds befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 3761da177e4SLinus Torvalds inode->i_size = 0; 3771da177e4SLinus Torvalds inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 37839d7a29fSFabian Frederick strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 37939d7a29fSFabian Frederick BEFS_SYMLINK_LEN); 3801da177e4SLinus Torvalds } else { 3811da177e4SLinus Torvalds int num_blks; 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds befs_ino->i_data.ds = 384e0e3d32bSJesper Juhl fsds_to_cpu(sb, &raw_inode->data.datastream); 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 3871da177e4SLinus Torvalds inode->i_blocks = 3881da177e4SLinus Torvalds num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 3891da177e4SLinus Torvalds inode->i_size = befs_ino->i_data.ds.size; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds inode->i_mapping->a_ops = &befs_aops; 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds if (S_ISREG(inode->i_mode)) { 3952cf06916SChristoph Hellwig inode->i_fop = &generic_ro_fops; 3961da177e4SLinus Torvalds } else if (S_ISDIR(inode->i_mode)) { 3971da177e4SLinus Torvalds inode->i_op = &befs_dir_inode_operations; 3981da177e4SLinus Torvalds inode->i_fop = &befs_dir_operations; 3991da177e4SLinus Torvalds } else if (S_ISLNK(inode->i_mode)) { 400d0deec19SAl Viro if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 4011da177e4SLinus Torvalds inode->i_op = &befs_symlink_inode_operations; 402d0deec19SAl Viro } else { 403d0deec19SAl Viro inode->i_link = befs_ino->i_data.symlink; 404d0deec19SAl Viro inode->i_op = &simple_symlink_inode_operations; 405d0deec19SAl Viro } 4061da177e4SLinus Torvalds } else { 4071da177e4SLinus Torvalds befs_error(sb, "Inode %lu is not a regular file, " 4081da177e4SLinus Torvalds "directory or symlink. THAT IS WRONG! BeFS has no " 4091da177e4SLinus Torvalds "on disk special files", inode->i_ino); 4100418726bSAdrian Bunk goto unacquire_bh; 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds brelse(bh); 414dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__); 41596eb5419SDavid Howells unlock_new_inode(inode); 41696eb5419SDavid Howells return inode; 4171da177e4SLinus Torvalds 4180418726bSAdrian Bunk unacquire_bh: 4191da177e4SLinus Torvalds brelse(bh); 4201da177e4SLinus Torvalds 4210418726bSAdrian Bunk unacquire_none: 42296eb5419SDavid Howells iget_failed(inode); 423dac52fc1SFabian Frederick befs_debug(sb, "<--- %s - Bad inode", __func__); 42496eb5419SDavid Howells return ERR_PTR(ret); 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds /* Initialize the inode cache. Called at fs setup. 4281da177e4SLinus Torvalds * 4291da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4301da177e4SLinus Torvalds */ 43191a52ab7SFabian Frederick static int __init 4321da177e4SLinus Torvalds befs_init_inodecache(void) 4331da177e4SLinus Torvalds { 4341da177e4SLinus Torvalds befs_inode_cachep = kmem_cache_create("befs_inode_cache", 4351da177e4SLinus Torvalds sizeof (struct befs_inode_info), 436fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 437fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 43820c2df83SPaul Mundt init_once); 4391da177e4SLinus Torvalds if (befs_inode_cachep == NULL) { 440dac52fc1SFabian Frederick pr_err("%s: Couldn't initialize inode slabcache\n", __func__); 4411da177e4SLinus Torvalds return -ENOMEM; 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds return 0; 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds /* Called at fs teardown. 4471da177e4SLinus Torvalds * 4481da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4491da177e4SLinus Torvalds */ 4501da177e4SLinus Torvalds static void 4511da177e4SLinus Torvalds befs_destroy_inodecache(void) 4521da177e4SLinus Torvalds { 4538c0a8537SKirill A. Shutemov /* 4548c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 4558c0a8537SKirill A. Shutemov * destroy cache. 4568c0a8537SKirill A. Shutemov */ 4578c0a8537SKirill A. Shutemov rcu_barrier(); 4581a1d92c1SAlexey Dobriyan kmem_cache_destroy(befs_inode_cachep); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* 4621da177e4SLinus Torvalds * The inode of symbolic link is different to data stream. 4631da177e4SLinus Torvalds * The data stream become link name. Unless the LONG_SYMLINK 4641da177e4SLinus Torvalds * flag is set. 4651da177e4SLinus Torvalds */ 466db873896SLinus Torvalds static void * 4671da177e4SLinus Torvalds befs_follow_link(struct dentry *dentry, struct nameidata *nd) 4681da177e4SLinus Torvalds { 4691da177e4SLinus Torvalds struct super_block *sb = dentry->d_sb; 4709ec3a646SLinus Torvalds struct befs_inode_info *befs_ino = BEFS_I(d_inode(dentry)); 4711da177e4SLinus Torvalds befs_data_stream *data = &befs_ino->i_data.ds; 4721da177e4SLinus Torvalds befs_off_t len = data->size; 47348bc06e7SAl Viro char *link; 4741da177e4SLinus Torvalds 475338d0f0aSTimo Warns if (len == 0) { 476338d0f0aSTimo Warns befs_error(sb, "Long symlink with illegal length"); 477338d0f0aSTimo Warns link = ERR_PTR(-EIO); 478338d0f0aSTimo Warns } else { 4791da177e4SLinus Torvalds befs_debug(sb, "Follow long symlink"); 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds link = kmalloc(len, GFP_NOFS); 4821da177e4SLinus Torvalds if (!link) { 4831da177e4SLinus Torvalds link = ERR_PTR(-ENOMEM); 4841da177e4SLinus Torvalds } else if (befs_read_lsymlink(sb, data, link, len) != len) { 4851da177e4SLinus Torvalds kfree(link); 4861da177e4SLinus Torvalds befs_error(sb, "Failed to read entire long symlink"); 4871da177e4SLinus Torvalds link = ERR_PTR(-EIO); 4887df5fa06SDuane Griffin } else { 4897df5fa06SDuane Griffin link[len - 1] = '\0'; 4901da177e4SLinus Torvalds } 491338d0f0aSTimo Warns } 4921da177e4SLinus Torvalds nd_set_link(nd, link); 493008b150aSAl Viro return NULL; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds /* 4971da177e4SLinus Torvalds * UTF-8 to NLS charset convert routine 4981da177e4SLinus Torvalds * 4991da177e4SLinus Torvalds * 5001da177e4SLinus Torvalds * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 5011da177e4SLinus Torvalds * the nls tables directly 5021da177e4SLinus Torvalds */ 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds static int 5051da177e4SLinus Torvalds befs_utf2nls(struct super_block *sb, const char *in, 5061da177e4SLinus Torvalds int in_len, char **out, int *out_len) 5071da177e4SLinus Torvalds { 5081da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 5091da177e4SLinus Torvalds int i, o; 51074675a58SAlan Stern unicode_t uni; 5111da177e4SLinus Torvalds int unilen, utflen; 5121da177e4SLinus Torvalds char *result; 51394f563c4SDiego Calleja /* The utf8->nls conversion won't make the final nls string bigger 51494f563c4SDiego Calleja * than the utf one, but if the string is pure ascii they'll have the 51594f563c4SDiego Calleja * same width and an extra char is needed to save the additional \0 51694f563c4SDiego Calleja */ 51794f563c4SDiego Calleja int maxlen = in_len + 1; 5181da177e4SLinus Torvalds 519dac52fc1SFabian Frederick befs_debug(sb, "---> %s", __func__); 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds if (!nls) { 522dac52fc1SFabian Frederick befs_error(sb, "%s called with no NLS table loaded", __func__); 5231da177e4SLinus Torvalds return -EINVAL; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 5271da177e4SLinus Torvalds if (!*out) { 528dac52fc1SFabian Frederick befs_error(sb, "%s cannot allocate memory", __func__); 5291da177e4SLinus Torvalds *out_len = 0; 5301da177e4SLinus Torvalds return -ENOMEM; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += utflen, o += unilen) { 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /* convert from UTF-8 to Unicode */ 53674675a58SAlan Stern utflen = utf8_to_utf32(&in[i], in_len - i, &uni); 53774675a58SAlan Stern if (utflen < 0) 5381da177e4SLinus Torvalds goto conv_err; 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds /* convert from Unicode to nls */ 54174675a58SAlan Stern if (uni > MAX_WCHAR_T) 5421da177e4SLinus Torvalds goto conv_err; 54374675a58SAlan Stern unilen = nls->uni2char(uni, &result[o], in_len - o); 54474675a58SAlan Stern if (unilen < 0) 54574675a58SAlan Stern goto conv_err; 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds result[o] = '\0'; 5481da177e4SLinus Torvalds *out_len = o; 5491da177e4SLinus Torvalds 550dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__); 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds return o; 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds conv_err: 5551da177e4SLinus Torvalds befs_error(sb, "Name using character set %s contains a character that " 5561da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 557dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__); 5581da177e4SLinus Torvalds kfree(result); 5591da177e4SLinus Torvalds return -EILSEQ; 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds /** 5631da177e4SLinus Torvalds * befs_nls2utf - Convert NLS string to utf8 encodeing 5641da177e4SLinus Torvalds * @sb: Superblock 565817e1d90SFabian Frederick * @in: Input string buffer in NLS format 566817e1d90SFabian Frederick * @in_len: Length of input string in bytes 567817e1d90SFabian Frederick * @out: The output string in UTF-8 format 568817e1d90SFabian Frederick * @out_len: Length of the output buffer 5691da177e4SLinus Torvalds * 570817e1d90SFabian Frederick * Converts input string @in, which is in the format of the loaded NLS map, 5711da177e4SLinus Torvalds * into a utf8 string. 5721da177e4SLinus Torvalds * 573817e1d90SFabian Frederick * The destination string @out is allocated by this function and the caller is 5741da177e4SLinus Torvalds * responsible for freeing it with kfree() 5751da177e4SLinus Torvalds * 576817e1d90SFabian Frederick * On return, *@out_len is the length of @out in bytes. 5771da177e4SLinus Torvalds * 5781da177e4SLinus Torvalds * On success, the return value is the number of utf8 characters written to 579817e1d90SFabian Frederick * the output buffer @out. 5801da177e4SLinus Torvalds * 5811da177e4SLinus Torvalds * On Failure, a negative number coresponding to the error code is returned. 5821da177e4SLinus Torvalds */ 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds static int 5851da177e4SLinus Torvalds befs_nls2utf(struct super_block *sb, const char *in, 5861da177e4SLinus Torvalds int in_len, char **out, int *out_len) 5871da177e4SLinus Torvalds { 5881da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 5891da177e4SLinus Torvalds int i, o; 5901da177e4SLinus Torvalds wchar_t uni; 5911da177e4SLinus Torvalds int unilen, utflen; 5921da177e4SLinus Torvalds char *result; 59394f563c4SDiego Calleja /* There're nls characters that will translate to 3-chars-wide UTF-8 59494f563c4SDiego Calleja * characters, a additional byte is needed to save the final \0 59594f563c4SDiego Calleja * in special cases */ 59694f563c4SDiego Calleja int maxlen = (3 * in_len) + 1; 5971da177e4SLinus Torvalds 598dac52fc1SFabian Frederick befs_debug(sb, "---> %s\n", __func__); 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds if (!nls) { 601dac52fc1SFabian Frederick befs_error(sb, "%s called with no NLS table loaded.", 602dac52fc1SFabian Frederick __func__); 6031da177e4SLinus Torvalds return -EINVAL; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 6071da177e4SLinus Torvalds if (!*out) { 608dac52fc1SFabian Frederick befs_error(sb, "%s cannot allocate memory", __func__); 6091da177e4SLinus Torvalds *out_len = 0; 6101da177e4SLinus Torvalds return -ENOMEM; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += unilen, o += utflen) { 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds /* convert from nls to unicode */ 6161da177e4SLinus Torvalds unilen = nls->char2uni(&in[i], in_len - i, &uni); 61774675a58SAlan Stern if (unilen < 0) 6181da177e4SLinus Torvalds goto conv_err; 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* convert from unicode to UTF-8 */ 62174675a58SAlan Stern utflen = utf32_to_utf8(uni, &result[o], 3); 62274675a58SAlan Stern if (utflen <= 0) 6231da177e4SLinus Torvalds goto conv_err; 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds result[o] = '\0'; 6271da177e4SLinus Torvalds *out_len = o; 6281da177e4SLinus Torvalds 629dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__); 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds return i; 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds conv_err: 6341da177e4SLinus Torvalds befs_error(sb, "Name using charecter set %s contains a charecter that " 6351da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 636dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__); 6371da177e4SLinus Torvalds kfree(result); 6381da177e4SLinus Torvalds return -EILSEQ; 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds /** 6421da177e4SLinus Torvalds * Use the 6431da177e4SLinus Torvalds * 6441da177e4SLinus Torvalds */ 6451da177e4SLinus Torvalds enum { 6461da177e4SLinus Torvalds Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 6471da177e4SLinus Torvalds }; 6481da177e4SLinus Torvalds 649a447c093SSteven Whitehouse static const match_table_t befs_tokens = { 6501da177e4SLinus Torvalds {Opt_uid, "uid=%d"}, 6511da177e4SLinus Torvalds {Opt_gid, "gid=%d"}, 6521da177e4SLinus Torvalds {Opt_charset, "iocharset=%s"}, 6531da177e4SLinus Torvalds {Opt_debug, "debug"}, 6541da177e4SLinus Torvalds {Opt_err, NULL} 6551da177e4SLinus Torvalds }; 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds static int 65809ad0eaeSFabian Frederick parse_options(char *options, struct befs_mount_options *opts) 6591da177e4SLinus Torvalds { 6601da177e4SLinus Torvalds char *p; 6611da177e4SLinus Torvalds substring_t args[MAX_OPT_ARGS]; 6621da177e4SLinus Torvalds int option; 66331aba059SEric W. Biederman kuid_t uid; 66431aba059SEric W. Biederman kgid_t gid; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds /* Initialize options */ 66731aba059SEric W. Biederman opts->uid = GLOBAL_ROOT_UID; 66831aba059SEric W. Biederman opts->gid = GLOBAL_ROOT_GID; 6691da177e4SLinus Torvalds opts->use_uid = 0; 6701da177e4SLinus Torvalds opts->use_gid = 0; 6711da177e4SLinus Torvalds opts->iocharset = NULL; 6721da177e4SLinus Torvalds opts->debug = 0; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds if (!options) 6751da177e4SLinus Torvalds return 1; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds while ((p = strsep(&options, ",")) != NULL) { 6781da177e4SLinus Torvalds int token; 6791da177e4SLinus Torvalds if (!*p) 6801da177e4SLinus Torvalds continue; 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds token = match_token(p, befs_tokens, args); 6831da177e4SLinus Torvalds switch (token) { 6841da177e4SLinus Torvalds case Opt_uid: 6851da177e4SLinus Torvalds if (match_int(&args[0], &option)) 6861da177e4SLinus Torvalds return 0; 68731aba059SEric W. Biederman uid = INVALID_UID; 68831aba059SEric W. Biederman if (option >= 0) 68931aba059SEric W. Biederman uid = make_kuid(current_user_ns(), option); 69031aba059SEric W. Biederman if (!uid_valid(uid)) { 691dac52fc1SFabian Frederick pr_err("Invalid uid %d, " 6921da177e4SLinus Torvalds "using default\n", option); 6931da177e4SLinus Torvalds break; 6941da177e4SLinus Torvalds } 69531aba059SEric W. Biederman opts->uid = uid; 6961da177e4SLinus Torvalds opts->use_uid = 1; 6971da177e4SLinus Torvalds break; 6981da177e4SLinus Torvalds case Opt_gid: 6991da177e4SLinus Torvalds if (match_int(&args[0], &option)) 7001da177e4SLinus Torvalds return 0; 70131aba059SEric W. Biederman gid = INVALID_GID; 70231aba059SEric W. Biederman if (option >= 0) 70331aba059SEric W. Biederman gid = make_kgid(current_user_ns(), option); 70431aba059SEric W. Biederman if (!gid_valid(gid)) { 705dac52fc1SFabian Frederick pr_err("Invalid gid %d, " 7061da177e4SLinus Torvalds "using default\n", option); 7071da177e4SLinus Torvalds break; 7081da177e4SLinus Torvalds } 70931aba059SEric W. Biederman opts->gid = gid; 7101da177e4SLinus Torvalds opts->use_gid = 1; 7111da177e4SLinus Torvalds break; 7121da177e4SLinus Torvalds case Opt_charset: 7131da177e4SLinus Torvalds kfree(opts->iocharset); 7141da177e4SLinus Torvalds opts->iocharset = match_strdup(&args[0]); 7151da177e4SLinus Torvalds if (!opts->iocharset) { 716dac52fc1SFabian Frederick pr_err("allocation failure for " 7171da177e4SLinus Torvalds "iocharset string\n"); 7181da177e4SLinus Torvalds return 0; 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds break; 7211da177e4SLinus Torvalds case Opt_debug: 7221da177e4SLinus Torvalds opts->debug = 1; 7231da177e4SLinus Torvalds break; 7241da177e4SLinus Torvalds default: 725dac52fc1SFabian Frederick pr_err("Unrecognized mount option \"%s\" " 7261da177e4SLinus Torvalds "or missing value\n", p); 7271da177e4SLinus Torvalds return 0; 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds } 7301da177e4SLinus Torvalds return 1; 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* This function has the responsibiltiy of getting the 7341da177e4SLinus Torvalds * filesystem ready for unmounting. 73525985edcSLucas De Marchi * Basically, we free everything that we allocated in 7361da177e4SLinus Torvalds * befs_read_inode 7371da177e4SLinus Torvalds */ 7381da177e4SLinus Torvalds static void 7391da177e4SLinus Torvalds befs_put_super(struct super_block *sb) 7401da177e4SLinus Torvalds { 7411da177e4SLinus Torvalds kfree(BEFS_SB(sb)->mount_opts.iocharset); 7421da177e4SLinus Torvalds BEFS_SB(sb)->mount_opts.iocharset = NULL; 7431da177e4SLinus Torvalds unload_nls(BEFS_SB(sb)->nls); 7441da177e4SLinus Torvalds kfree(sb->s_fs_info); 7451da177e4SLinus Torvalds sb->s_fs_info = NULL; 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds /* Allocate private field of the superblock, fill it. 7491da177e4SLinus Torvalds * 7501da177e4SLinus Torvalds * Finish filling the public superblock fields 7511da177e4SLinus Torvalds * Make the root directory 7521da177e4SLinus Torvalds * Load a set of NLS translations if needed. 7531da177e4SLinus Torvalds */ 7541da177e4SLinus Torvalds static int 7551da177e4SLinus Torvalds befs_fill_super(struct super_block *sb, void *data, int silent) 7561da177e4SLinus Torvalds { 7571da177e4SLinus Torvalds struct buffer_head *bh; 758038428fcSFabian Frederick struct befs_sb_info *befs_sb; 7591da177e4SLinus Torvalds befs_super_block *disk_sb; 7601da177e4SLinus Torvalds struct inode *root; 76196eb5419SDavid Howells long ret = -EINVAL; 7621da177e4SLinus Torvalds const unsigned long sb_block = 0; 7631da177e4SLinus Torvalds const off_t x86_sb_off = 512; 7641da177e4SLinus Torvalds 765552c3c6cSMiklos Szeredi save_mount_options(sb, data); 766552c3c6cSMiklos Szeredi 7672d4319efSFabian Frederick sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); 7681da177e4SLinus Torvalds if (sb->s_fs_info == NULL) { 769dac52fc1SFabian Frederick pr_err("(%s): Unable to allocate memory for private " 7701da177e4SLinus Torvalds "portion of superblock. Bailing.\n", sb->s_id); 7710418726bSAdrian Bunk goto unacquire_none; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds befs_sb = BEFS_SB(sb); 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds if (!parse_options((char *) data, &befs_sb->mount_opts)) { 7761da177e4SLinus Torvalds befs_error(sb, "cannot parse mount options"); 7770418726bSAdrian Bunk goto unacquire_priv_sbp; 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds 780dac52fc1SFabian Frederick befs_debug(sb, "---> %s", __func__); 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds if (!(sb->s_flags & MS_RDONLY)) { 7831da177e4SLinus Torvalds befs_warning(sb, 7841da177e4SLinus Torvalds "No write support. Marking filesystem read-only"); 7851da177e4SLinus Torvalds sb->s_flags |= MS_RDONLY; 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* 7891da177e4SLinus Torvalds * Set dummy blocksize to read super block. 7901da177e4SLinus Torvalds * Will be set to real fs blocksize later. 7911da177e4SLinus Torvalds * 7921da177e4SLinus Torvalds * Linux 2.4.10 and later refuse to read blocks smaller than 7931da177e4SLinus Torvalds * the hardsect size for the device. But we also need to read at 7941da177e4SLinus Torvalds * least 1k to get the second 512 bytes of the volume. 7951da177e4SLinus Torvalds * -WD 10-26-01 7961da177e4SLinus Torvalds */ 7971da177e4SLinus Torvalds sb_min_blocksize(sb, 1024); 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds if (!(bh = sb_bread(sb, sb_block))) { 8001da177e4SLinus Torvalds befs_error(sb, "unable to read superblock"); 8010418726bSAdrian Bunk goto unacquire_priv_sbp; 8021da177e4SLinus Torvalds } 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds /* account for offset of super block on x86 */ 8051da177e4SLinus Torvalds disk_sb = (befs_super_block *) bh->b_data; 806152b95a1SHarvey Harrison if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 807152b95a1SHarvey Harrison (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 8081da177e4SLinus Torvalds befs_debug(sb, "Using PPC superblock location"); 8091da177e4SLinus Torvalds } else { 8101da177e4SLinus Torvalds befs_debug(sb, "Using x86 superblock location"); 8111da177e4SLinus Torvalds disk_sb = 8121da177e4SLinus Torvalds (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 8131da177e4SLinus Torvalds } 8141da177e4SLinus Torvalds 8158e19189eSFabian Frederick if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || 8168e19189eSFabian Frederick (befs_check_sb(sb) != BEFS_OK)) 8170418726bSAdrian Bunk goto unacquire_bh; 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvalds befs_dump_super_block(sb, disk_sb); 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds brelse(bh); 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds if( befs_sb->num_blocks > ~((sector_t)0) ) { 824dac52fc1SFabian Frederick befs_error(sb, "blocks count: %llu " 8251da177e4SLinus Torvalds "is larger than the host can use", 8261da177e4SLinus Torvalds befs_sb->num_blocks); 8270418726bSAdrian Bunk goto unacquire_priv_sbp; 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds /* 8311da177e4SLinus Torvalds * set up enough so that it can read an inode 8321da177e4SLinus Torvalds * Fill in kernel superblock fields from private sb 8331da177e4SLinus Torvalds */ 8341da177e4SLinus Torvalds sb->s_magic = BEFS_SUPER_MAGIC; 8351da177e4SLinus Torvalds /* Set real blocksize of fs */ 8361da177e4SLinus Torvalds sb_set_blocksize(sb, (ulong) befs_sb->block_size); 837b87221deSAlexey Dobriyan sb->s_op = &befs_sops; 83896eb5419SDavid Howells root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 83996eb5419SDavid Howells if (IS_ERR(root)) { 84096eb5419SDavid Howells ret = PTR_ERR(root); 84196eb5419SDavid Howells goto unacquire_priv_sbp; 84296eb5419SDavid Howells } 84348fde701SAl Viro sb->s_root = d_make_root(root); 8441da177e4SLinus Torvalds if (!sb->s_root) { 8451da177e4SLinus Torvalds befs_error(sb, "get root inode failed"); 8460418726bSAdrian Bunk goto unacquire_priv_sbp; 8471da177e4SLinus Torvalds } 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds /* load nls library */ 8501da177e4SLinus Torvalds if (befs_sb->mount_opts.iocharset) { 8511da177e4SLinus Torvalds befs_debug(sb, "Loading nls: %s", 8521da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8531da177e4SLinus Torvalds befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 8541da177e4SLinus Torvalds if (!befs_sb->nls) { 8551da177e4SLinus Torvalds befs_warning(sb, "Cannot load nls %s" 8561da177e4SLinus Torvalds " loading default nls", 8571da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8581da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds /* load default nls if none is specified in mount options */ 8611da177e4SLinus Torvalds } else { 8621da177e4SLinus Torvalds befs_debug(sb, "Loading default nls"); 8631da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8641da177e4SLinus Torvalds } 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds return 0; 8671da177e4SLinus Torvalds /*****************/ 8680418726bSAdrian Bunk unacquire_bh: 8691da177e4SLinus Torvalds brelse(bh); 8701da177e4SLinus Torvalds 8710418726bSAdrian Bunk unacquire_priv_sbp: 8728dd5ca53SAl Viro kfree(befs_sb->mount_opts.iocharset); 8731da177e4SLinus Torvalds kfree(sb->s_fs_info); 8741da177e4SLinus Torvalds 8750418726bSAdrian Bunk unacquire_none: 8761da177e4SLinus Torvalds sb->s_fs_info = NULL; 87796eb5419SDavid Howells return ret; 8781da177e4SLinus Torvalds } 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds static int 8811da177e4SLinus Torvalds befs_remount(struct super_block *sb, int *flags, char *data) 8821da177e4SLinus Torvalds { 88302b9984dSTheodore Ts'o sync_filesystem(sb); 8841da177e4SLinus Torvalds if (!(*flags & MS_RDONLY)) 8851da177e4SLinus Torvalds return -EINVAL; 8861da177e4SLinus Torvalds return 0; 8871da177e4SLinus Torvalds } 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds static int 890726c3342SDavid Howells befs_statfs(struct dentry *dentry, struct kstatfs *buf) 8911da177e4SLinus Torvalds { 892726c3342SDavid Howells struct super_block *sb = dentry->d_sb; 8938587246aSColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 8941da177e4SLinus Torvalds 895dac52fc1SFabian Frederick befs_debug(sb, "---> %s", __func__); 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds buf->f_type = BEFS_SUPER_MAGIC; 8981da177e4SLinus Torvalds buf->f_bsize = sb->s_blocksize; 8991da177e4SLinus Torvalds buf->f_blocks = BEFS_SB(sb)->num_blocks; 9001da177e4SLinus Torvalds buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 9011da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree; 9021da177e4SLinus Torvalds buf->f_files = 0; /* UNKNOWN */ 9031da177e4SLinus Torvalds buf->f_ffree = 0; /* UNKNOWN */ 9048587246aSColy Li buf->f_fsid.val[0] = (u32)id; 9058587246aSColy Li buf->f_fsid.val[1] = (u32)(id >> 32); 9061da177e4SLinus Torvalds buf->f_namelen = BEFS_NAME_LEN; 9071da177e4SLinus Torvalds 908dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds return 0; 9111da177e4SLinus Torvalds } 9121da177e4SLinus Torvalds 913152a0836SAl Viro static struct dentry * 914152a0836SAl Viro befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, 915152a0836SAl Viro void *data) 9161da177e4SLinus Torvalds { 917152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds static struct file_system_type befs_fs_type = { 9211da177e4SLinus Torvalds .owner = THIS_MODULE, 9221da177e4SLinus Torvalds .name = "befs", 923152a0836SAl Viro .mount = befs_mount, 9241da177e4SLinus Torvalds .kill_sb = kill_block_super, 9251da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 9261da177e4SLinus Torvalds }; 9277f78e035SEric W. Biederman MODULE_ALIAS_FS("befs"); 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds static int __init 9301da177e4SLinus Torvalds init_befs_fs(void) 9311da177e4SLinus Torvalds { 9321da177e4SLinus Torvalds int err; 9331da177e4SLinus Torvalds 934dac52fc1SFabian Frederick pr_info("version: %s\n", BEFS_VERSION); 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds err = befs_init_inodecache(); 9371da177e4SLinus Torvalds if (err) 9380418726bSAdrian Bunk goto unacquire_none; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds err = register_filesystem(&befs_fs_type); 9411da177e4SLinus Torvalds if (err) 9420418726bSAdrian Bunk goto unacquire_inodecache; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds return 0; 9451da177e4SLinus Torvalds 9460418726bSAdrian Bunk unacquire_inodecache: 9471da177e4SLinus Torvalds befs_destroy_inodecache(); 9481da177e4SLinus Torvalds 9490418726bSAdrian Bunk unacquire_none: 9501da177e4SLinus Torvalds return err; 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds static void __exit 9541da177e4SLinus Torvalds exit_befs_fs(void) 9551da177e4SLinus Torvalds { 9561da177e4SLinus Torvalds befs_destroy_inodecache(); 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds unregister_filesystem(&befs_fs_type); 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds /* 9621da177e4SLinus Torvalds Macros that typecheck the init and exit functions, 9631da177e4SLinus Torvalds ensures that they are called at init and cleanup, 9641da177e4SLinus Torvalds and eliminates warnings about unused functions. 9651da177e4SLinus Torvalds */ 9661da177e4SLinus Torvalds module_init(init_befs_fs) 9671da177e4SLinus Torvalds module_exit(exit_befs_fs) 968