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 34f0f49ef5SAl Viro static int befs_readdir(struct file *, struct dir_context *); 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 void befs_destroy_inodecache(void); 43008b150aSAl Viro static void *befs_follow_link(struct dentry *, struct nameidata *); 4448bc06e7SAl Viro static void *befs_fast_follow_link(struct dentry *, struct nameidata *); 451da177e4SLinus Torvalds static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, 461da177e4SLinus Torvalds char **out, int *out_len); 471da177e4SLinus Torvalds static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, 481da177e4SLinus Torvalds char **out, int *out_len); 491da177e4SLinus Torvalds static void befs_put_super(struct super_block *); 501da177e4SLinus Torvalds static int befs_remount(struct super_block *, int *, char *); 51726c3342SDavid Howells static int befs_statfs(struct dentry *, struct kstatfs *); 521da177e4SLinus Torvalds static int parse_options(char *, befs_mount_options *); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static const struct super_operations befs_sops = { 551da177e4SLinus Torvalds .alloc_inode = befs_alloc_inode, /* allocate a new inode */ 561da177e4SLinus Torvalds .destroy_inode = befs_destroy_inode, /* deallocate an inode */ 571da177e4SLinus Torvalds .put_super = befs_put_super, /* uninit super */ 581da177e4SLinus Torvalds .statfs = befs_statfs, /* statfs */ 591da177e4SLinus Torvalds .remount_fs = befs_remount, 60552c3c6cSMiklos Szeredi .show_options = generic_show_options, 611da177e4SLinus Torvalds }; 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds /* slab cache for befs_inode_info objects */ 64e18b890bSChristoph Lameter static struct kmem_cache *befs_inode_cachep; 651da177e4SLinus Torvalds 664b6f5d20SArjan van de Ven static const struct file_operations befs_dir_operations = { 671da177e4SLinus Torvalds .read = generic_read_dir, 68f0f49ef5SAl Viro .iterate = befs_readdir, 6959af1584SAl Viro .llseek = generic_file_llseek, 701da177e4SLinus Torvalds }; 711da177e4SLinus Torvalds 72754661f1SArjan van de Ven static const struct inode_operations befs_dir_inode_operations = { 731da177e4SLinus Torvalds .lookup = befs_lookup, 741da177e4SLinus Torvalds }; 751da177e4SLinus Torvalds 76f5e54d6eSChristoph Hellwig static const struct address_space_operations befs_aops = { 771da177e4SLinus Torvalds .readpage = befs_readpage, 781da177e4SLinus Torvalds .bmap = befs_bmap, 791da177e4SLinus Torvalds }; 801da177e4SLinus Torvalds 8148bc06e7SAl Viro static const struct inode_operations befs_fast_symlink_inode_operations = { 8248bc06e7SAl Viro .readlink = generic_readlink, 8348bc06e7SAl Viro .follow_link = befs_fast_follow_link, 8448bc06e7SAl Viro }; 8548bc06e7SAl Viro 86754661f1SArjan van de Ven static const struct inode_operations befs_symlink_inode_operations = { 871da177e4SLinus Torvalds .readlink = generic_readlink, 881da177e4SLinus Torvalds .follow_link = befs_follow_link, 8948bc06e7SAl Viro .put_link = kfree_put_link, 901da177e4SLinus Torvalds }; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds /* 931da177e4SLinus Torvalds * Called by generic_file_read() to read a page of data 941da177e4SLinus Torvalds * 951da177e4SLinus Torvalds * In turn, simply calls a generic block read function and 961da177e4SLinus Torvalds * passes it the address of befs_get_block, for mapping file 971da177e4SLinus Torvalds * positions to disk blocks. 981da177e4SLinus Torvalds */ 991da177e4SLinus Torvalds static int 1001da177e4SLinus Torvalds befs_readpage(struct file *file, struct page *page) 1011da177e4SLinus Torvalds { 1021da177e4SLinus Torvalds return block_read_full_page(page, befs_get_block); 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds static sector_t 1061da177e4SLinus Torvalds befs_bmap(struct address_space *mapping, sector_t block) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds return generic_block_bmap(mapping, block, befs_get_block); 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds /* 1121da177e4SLinus Torvalds * Generic function to map a file position (block) to a 1131da177e4SLinus Torvalds * disk offset (passed back in bh_result). 1141da177e4SLinus Torvalds * 1151da177e4SLinus Torvalds * Used by many higher level functions. 1161da177e4SLinus Torvalds * 1171da177e4SLinus Torvalds * Calls befs_fblock2brun() in datastream.c to do the real work. 1181da177e4SLinus Torvalds * 1191da177e4SLinus Torvalds * -WD 10-26-01 1201da177e4SLinus Torvalds */ 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds static int 1231da177e4SLinus Torvalds befs_get_block(struct inode *inode, sector_t block, 1241da177e4SLinus Torvalds struct buffer_head *bh_result, int create) 1251da177e4SLinus Torvalds { 1261da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 1271da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 1281da177e4SLinus Torvalds befs_block_run run = BAD_IADDR; 1291da177e4SLinus Torvalds int res = 0; 1301da177e4SLinus Torvalds ulong disk_off; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", 1331da177e4SLinus Torvalds inode->i_ino, block); 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds if (block < 0) { 1361da177e4SLinus Torvalds befs_error(sb, "befs_get_block() was asked for a block " 1371da177e4SLinus Torvalds "number less than zero: block %ld in inode %lu", 1381da177e4SLinus Torvalds block, inode->i_ino); 1391da177e4SLinus Torvalds return -EIO; 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds if (create) { 1431da177e4SLinus Torvalds befs_error(sb, "befs_get_block() was asked to write to " 1441da177e4SLinus Torvalds "block %ld in inode %lu", block, inode->i_ino); 1451da177e4SLinus Torvalds return -EPERM; 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds res = befs_fblock2brun(sb, ds, block, &run); 1491da177e4SLinus Torvalds if (res != BEFS_OK) { 1501da177e4SLinus Torvalds befs_error(sb, 1511da177e4SLinus Torvalds "<--- befs_get_block() for inode %lu, block " 1521da177e4SLinus Torvalds "%ld ERROR", inode->i_ino, block); 1531da177e4SLinus Torvalds return -EFBIG; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds disk_off = (ulong) iaddr2blockno(sb, &run); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds map_bh(bh_result, inode->i_sb, disk_off); 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, " 1611da177e4SLinus Torvalds "disk address %lu", inode->i_ino, block, disk_off); 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds return 0; 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds static struct dentry * 16700cd8dd3SAl Viro befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds struct inode *inode = NULL; 1701da177e4SLinus Torvalds struct super_block *sb = dir->i_sb; 1711da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; 1721da177e4SLinus Torvalds befs_off_t offset; 1731da177e4SLinus Torvalds int ret; 1741da177e4SLinus Torvalds int utfnamelen; 1751da177e4SLinus Torvalds char *utfname; 1761da177e4SLinus Torvalds const char *name = dentry->d_name.name; 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds befs_debug(sb, "---> befs_lookup() " 1791da177e4SLinus Torvalds "name %s inode %ld", dentry->d_name.name, dir->i_ino); 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* Convert to UTF-8 */ 1821da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 1831da177e4SLinus Torvalds ret = 1841da177e4SLinus Torvalds befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); 1851da177e4SLinus Torvalds if (ret < 0) { 1861da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup() ERROR"); 1871da177e4SLinus Torvalds return ERR_PTR(ret); 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, utfname, &offset); 1901da177e4SLinus Torvalds kfree(utfname); 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds } else { 1931da177e4SLinus Torvalds ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds if (ret == BEFS_BT_NOT_FOUND) { 1971da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup() %s not found", 1981da177e4SLinus Torvalds dentry->d_name.name); 1991da177e4SLinus Torvalds return ERR_PTR(-ENOENT); 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds } else if (ret != BEFS_OK || offset == 0) { 2021da177e4SLinus Torvalds befs_warning(sb, "<--- befs_lookup() Error"); 2031da177e4SLinus Torvalds return ERR_PTR(-ENODATA); 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 20696eb5419SDavid Howells inode = befs_iget(dir->i_sb, (ino_t) offset); 20796eb5419SDavid Howells if (IS_ERR(inode)) 20896eb5419SDavid Howells return ERR_CAST(inode); 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds d_add(dentry, inode); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds befs_debug(sb, "<--- befs_lookup()"); 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds return NULL; 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds static int 218f0f49ef5SAl Viro befs_readdir(struct file *file, struct dir_context *ctx) 2191da177e4SLinus Torvalds { 220f0f49ef5SAl Viro struct inode *inode = file_inode(file); 2211da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 2221da177e4SLinus Torvalds befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 2231da177e4SLinus Torvalds befs_off_t value; 2241da177e4SLinus Torvalds int result; 2251da177e4SLinus Torvalds size_t keysize; 2261da177e4SLinus Torvalds unsigned char d_type; 2271da177e4SLinus Torvalds char keybuf[BEFS_NAME_LEN + 1]; 228f0f49ef5SAl Viro const char *dirname = file->f_path.dentry->d_name.name; 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds befs_debug(sb, "---> befs_readdir() " 231f0f49ef5SAl Viro "name %s, inode %ld, ctx->pos %Ld", 232f0f49ef5SAl Viro dirname, inode->i_ino, ctx->pos); 2331da177e4SLinus Torvalds 234f0f49ef5SAl Viro more: 235f0f49ef5SAl Viro result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, 2361da177e4SLinus Torvalds keybuf, &keysize, &value); 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds if (result == BEFS_ERR) { 2391da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() ERROR"); 2401da177e4SLinus Torvalds befs_error(sb, "IO error reading %s (inode %lu)", 2411da177e4SLinus Torvalds dirname, inode->i_ino); 2421da177e4SLinus Torvalds return -EIO; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds } else if (result == BEFS_BT_END) { 2451da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() END"); 2461da177e4SLinus Torvalds return 0; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds } else if (result == BEFS_BT_EMPTY) { 2491da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() Empty directory"); 2501da177e4SLinus Torvalds return 0; 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds d_type = DT_UNKNOWN; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds /* Convert to NLS */ 2561da177e4SLinus Torvalds if (BEFS_SB(sb)->nls) { 257f0f49ef5SAl Viro char *nlsname; 258f0f49ef5SAl Viro int nlsnamelen; 2591da177e4SLinus Torvalds result = 2601da177e4SLinus Torvalds befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); 2611da177e4SLinus Torvalds if (result < 0) { 2621da177e4SLinus Torvalds befs_debug(sb, "<--- befs_readdir() ERROR"); 2631da177e4SLinus Torvalds return result; 2641da177e4SLinus Torvalds } 265f0f49ef5SAl Viro if (!dir_emit(ctx, nlsname, nlsnamelen, 266f0f49ef5SAl Viro (ino_t) value, d_type)) { 2671da177e4SLinus Torvalds kfree(nlsname); 268f0f49ef5SAl Viro return 0; 2691da177e4SLinus Torvalds } 270f0f49ef5SAl Viro kfree(nlsname); 271f0f49ef5SAl Viro } else { 272f0f49ef5SAl Viro if (!dir_emit(ctx, keybuf, keysize, 273f0f49ef5SAl Viro (ino_t) value, d_type)) 274f0f49ef5SAl Viro return 0; 275f0f49ef5SAl Viro } 276f0f49ef5SAl Viro ctx->pos++; 277f0f49ef5SAl Viro goto more; 2781da177e4SLinus Torvalds 279f0f49ef5SAl Viro befs_debug(sb, "<--- befs_readdir() pos %Ld", ctx->pos); 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds return 0; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds static struct inode * 2851da177e4SLinus Torvalds befs_alloc_inode(struct super_block *sb) 2861da177e4SLinus Torvalds { 2871da177e4SLinus Torvalds struct befs_inode_info *bi; 2881da177e4SLinus Torvalds bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, 289e94b1766SChristoph Lameter GFP_KERNEL); 2901da177e4SLinus Torvalds if (!bi) 2911da177e4SLinus Torvalds return NULL; 2921da177e4SLinus Torvalds return &bi->vfs_inode; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 295fa0d7e3dSNick Piggin static void befs_i_callback(struct rcu_head *head) 2961da177e4SLinus Torvalds { 297fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 2981da177e4SLinus Torvalds kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 301fa0d7e3dSNick Piggin static void befs_destroy_inode(struct inode *inode) 302fa0d7e3dSNick Piggin { 303fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, befs_i_callback); 304fa0d7e3dSNick Piggin } 305fa0d7e3dSNick Piggin 30651cc5068SAlexey Dobriyan static void init_once(void *foo) 3071da177e4SLinus Torvalds { 3081da177e4SLinus Torvalds struct befs_inode_info *bi = (struct befs_inode_info *) foo; 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 31396eb5419SDavid Howells static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 3141da177e4SLinus Torvalds { 3151da177e4SLinus Torvalds struct buffer_head *bh = NULL; 3161da177e4SLinus Torvalds befs_inode *raw_inode = NULL; 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds befs_sb_info *befs_sb = BEFS_SB(sb); 3191da177e4SLinus Torvalds befs_inode_info *befs_ino = NULL; 32096eb5419SDavid Howells struct inode *inode; 32196eb5419SDavid Howells long ret = -EIO; 3221da177e4SLinus Torvalds 32396eb5419SDavid Howells befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); 32496eb5419SDavid Howells 32596eb5419SDavid Howells inode = iget_locked(sb, ino); 326ac34a1b3SRakesh Pandit if (!inode) 327ac34a1b3SRakesh Pandit return ERR_PTR(-ENOMEM); 32896eb5419SDavid Howells if (!(inode->i_state & I_NEW)) 32996eb5419SDavid Howells return inode; 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds befs_ino = BEFS_I(inode); 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds /* convert from vfs's inode number to befs's inode number */ 3341da177e4SLinus Torvalds befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds befs_debug(sb, " real inode number [%u, %hu, %hu]", 3371da177e4SLinus Torvalds befs_ino->i_inode_num.allocation_group, 3381da177e4SLinus Torvalds befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds bh = befs_bread(sb, inode->i_ino); 3411da177e4SLinus Torvalds if (!bh) { 3421da177e4SLinus Torvalds befs_error(sb, "unable to read inode block - " 3431da177e4SLinus Torvalds "inode = %lu", inode->i_ino); 3440418726bSAdrian Bunk goto unacquire_none; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds raw_inode = (befs_inode *) bh->b_data; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds befs_dump_inode(sb, raw_inode); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 3521da177e4SLinus Torvalds befs_error(sb, "Bad inode: %lu", inode->i_ino); 3530418726bSAdrian Bunk goto unacquire_bh; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds /* 3591da177e4SLinus Torvalds * set uid and gid. But since current BeOS is single user OS, so 3601da177e4SLinus Torvalds * you can change by "uid" or "gid" options. 3611da177e4SLinus Torvalds */ 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds inode->i_uid = befs_sb->mount_opts.use_uid ? 36431aba059SEric W. Biederman befs_sb->mount_opts.uid : 36531aba059SEric W. Biederman make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); 3661da177e4SLinus Torvalds inode->i_gid = befs_sb->mount_opts.use_gid ? 36731aba059SEric W. Biederman befs_sb->mount_opts.gid : 36831aba059SEric W. Biederman make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); 3691da177e4SLinus Torvalds 370bfe86848SMiklos Szeredi set_nlink(inode, 1); 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* 3731da177e4SLinus Torvalds * BEFS's time is 64 bits, but current VFS is 32 bits... 3741da177e4SLinus Torvalds * BEFS don't have access time. Nor inode change time. VFS 3751da177e4SLinus Torvalds * doesn't have creation time. 3761da177e4SLinus Torvalds * Also, the lower 16 bits of the last_modified_time and 3771da177e4SLinus Torvalds * create_time are just a counter to help ensure uniqueness 3781da177e4SLinus Torvalds * for indexing purposes. (PFD, page 54) 3791da177e4SLinus Torvalds */ 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds inode->i_mtime.tv_sec = 3821da177e4SLinus Torvalds fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 3831da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 3841da177e4SLinus Torvalds inode->i_ctime = inode->i_mtime; 3851da177e4SLinus Torvalds inode->i_atime = inode->i_mtime; 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 3881da177e4SLinus Torvalds befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 3891da177e4SLinus Torvalds befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 3901da177e4SLinus Torvalds befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 3931da177e4SLinus Torvalds inode->i_size = 0; 3941da177e4SLinus Torvalds inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 3951da177e4SLinus Torvalds strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 3967df5fa06SDuane Griffin BEFS_SYMLINK_LEN - 1); 3977df5fa06SDuane Griffin befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; 3981da177e4SLinus Torvalds } else { 3991da177e4SLinus Torvalds int num_blks; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds befs_ino->i_data.ds = 402e0e3d32bSJesper Juhl fsds_to_cpu(sb, &raw_inode->data.datastream); 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 4051da177e4SLinus Torvalds inode->i_blocks = 4061da177e4SLinus Torvalds num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 4071da177e4SLinus Torvalds inode->i_size = befs_ino->i_data.ds.size; 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds inode->i_mapping->a_ops = &befs_aops; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds if (S_ISREG(inode->i_mode)) { 4132cf06916SChristoph Hellwig inode->i_fop = &generic_ro_fops; 4141da177e4SLinus Torvalds } else if (S_ISDIR(inode->i_mode)) { 4151da177e4SLinus Torvalds inode->i_op = &befs_dir_inode_operations; 4161da177e4SLinus Torvalds inode->i_fop = &befs_dir_operations; 4171da177e4SLinus Torvalds } else if (S_ISLNK(inode->i_mode)) { 41848bc06e7SAl Viro if (befs_ino->i_flags & BEFS_LONG_SYMLINK) 4191da177e4SLinus Torvalds inode->i_op = &befs_symlink_inode_operations; 42048bc06e7SAl Viro else 42148bc06e7SAl Viro inode->i_op = &befs_fast_symlink_inode_operations; 4221da177e4SLinus Torvalds } else { 4231da177e4SLinus Torvalds befs_error(sb, "Inode %lu is not a regular file, " 4241da177e4SLinus Torvalds "directory or symlink. THAT IS WRONG! BeFS has no " 4251da177e4SLinus Torvalds "on disk special files", inode->i_ino); 4260418726bSAdrian Bunk goto unacquire_bh; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds brelse(bh); 4301da177e4SLinus Torvalds befs_debug(sb, "<--- befs_read_inode()"); 43196eb5419SDavid Howells unlock_new_inode(inode); 43296eb5419SDavid Howells return inode; 4331da177e4SLinus Torvalds 4340418726bSAdrian Bunk unacquire_bh: 4351da177e4SLinus Torvalds brelse(bh); 4361da177e4SLinus Torvalds 4370418726bSAdrian Bunk unacquire_none: 43896eb5419SDavid Howells iget_failed(inode); 4391da177e4SLinus Torvalds befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 44096eb5419SDavid Howells return ERR_PTR(ret); 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* Initialize the inode cache. Called at fs setup. 4441da177e4SLinus Torvalds * 4451da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4461da177e4SLinus Torvalds */ 44791a52ab7SFabian Frederick static int __init 4481da177e4SLinus Torvalds befs_init_inodecache(void) 4491da177e4SLinus Torvalds { 4501da177e4SLinus Torvalds befs_inode_cachep = kmem_cache_create("befs_inode_cache", 4511da177e4SLinus Torvalds sizeof (struct befs_inode_info), 452fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 453fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 45420c2df83SPaul Mundt init_once); 4551da177e4SLinus Torvalds if (befs_inode_cachep == NULL) { 4561da177e4SLinus Torvalds printk(KERN_ERR "befs_init_inodecache: " 457421f91d2SUwe Kleine-König "Couldn't initialize inode slabcache\n"); 4581da177e4SLinus Torvalds return -ENOMEM; 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds return 0; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds /* Called at fs teardown. 4651da177e4SLinus Torvalds * 4661da177e4SLinus Torvalds * Taken from NFS implementation by Al Viro. 4671da177e4SLinus Torvalds */ 4681da177e4SLinus Torvalds static void 4691da177e4SLinus Torvalds befs_destroy_inodecache(void) 4701da177e4SLinus Torvalds { 4718c0a8537SKirill A. Shutemov /* 4728c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 4738c0a8537SKirill A. Shutemov * destroy cache. 4748c0a8537SKirill A. Shutemov */ 4758c0a8537SKirill A. Shutemov rcu_barrier(); 4761a1d92c1SAlexey Dobriyan kmem_cache_destroy(befs_inode_cachep); 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds /* 4801da177e4SLinus Torvalds * The inode of symbolic link is different to data stream. 4811da177e4SLinus Torvalds * The data stream become link name. Unless the LONG_SYMLINK 4821da177e4SLinus Torvalds * flag is set. 4831da177e4SLinus Torvalds */ 484db873896SLinus Torvalds static void * 4851da177e4SLinus Torvalds befs_follow_link(struct dentry *dentry, struct nameidata *nd) 4861da177e4SLinus Torvalds { 4871da177e4SLinus Torvalds struct super_block *sb = dentry->d_sb; 48848bc06e7SAl Viro befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 4891da177e4SLinus Torvalds befs_data_stream *data = &befs_ino->i_data.ds; 4901da177e4SLinus Torvalds befs_off_t len = data->size; 49148bc06e7SAl Viro char *link; 4921da177e4SLinus Torvalds 493338d0f0aSTimo Warns if (len == 0) { 494338d0f0aSTimo Warns befs_error(sb, "Long symlink with illegal length"); 495338d0f0aSTimo Warns link = ERR_PTR(-EIO); 496338d0f0aSTimo Warns } else { 4971da177e4SLinus Torvalds befs_debug(sb, "Follow long symlink"); 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds link = kmalloc(len, GFP_NOFS); 5001da177e4SLinus Torvalds if (!link) { 5011da177e4SLinus Torvalds link = ERR_PTR(-ENOMEM); 5021da177e4SLinus Torvalds } else if (befs_read_lsymlink(sb, data, link, len) != len) { 5031da177e4SLinus Torvalds kfree(link); 5041da177e4SLinus Torvalds befs_error(sb, "Failed to read entire long symlink"); 5051da177e4SLinus Torvalds link = ERR_PTR(-EIO); 5067df5fa06SDuane Griffin } else { 5077df5fa06SDuane Griffin link[len - 1] = '\0'; 5081da177e4SLinus Torvalds } 509338d0f0aSTimo Warns } 5101da177e4SLinus Torvalds nd_set_link(nd, link); 511008b150aSAl Viro return NULL; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 51448bc06e7SAl Viro 51548bc06e7SAl Viro static void * 51648bc06e7SAl Viro befs_fast_follow_link(struct dentry *dentry, struct nameidata *nd) 5171da177e4SLinus Torvalds { 5181da177e4SLinus Torvalds befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 51948bc06e7SAl Viro nd_set_link(nd, befs_ino->i_data.symlink); 52048bc06e7SAl Viro return NULL; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds /* 5241da177e4SLinus Torvalds * UTF-8 to NLS charset convert routine 5251da177e4SLinus Torvalds * 5261da177e4SLinus Torvalds * 5271da177e4SLinus Torvalds * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 5281da177e4SLinus Torvalds * the nls tables directly 5291da177e4SLinus Torvalds */ 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds static int 5321da177e4SLinus Torvalds befs_utf2nls(struct super_block *sb, const char *in, 5331da177e4SLinus Torvalds int in_len, char **out, int *out_len) 5341da177e4SLinus Torvalds { 5351da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 5361da177e4SLinus Torvalds int i, o; 53774675a58SAlan Stern unicode_t uni; 5381da177e4SLinus Torvalds int unilen, utflen; 5391da177e4SLinus Torvalds char *result; 54094f563c4SDiego Calleja /* The utf8->nls conversion won't make the final nls string bigger 54194f563c4SDiego Calleja * than the utf one, but if the string is pure ascii they'll have the 54294f563c4SDiego Calleja * same width and an extra char is needed to save the additional \0 54394f563c4SDiego Calleja */ 54494f563c4SDiego Calleja int maxlen = in_len + 1; 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds befs_debug(sb, "---> utf2nls()"); 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds if (!nls) { 5491da177e4SLinus Torvalds befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 5501da177e4SLinus Torvalds return -EINVAL; 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 5541da177e4SLinus Torvalds if (!*out) { 5551da177e4SLinus Torvalds befs_error(sb, "befs_utf2nls() cannot allocate memory"); 5561da177e4SLinus Torvalds *out_len = 0; 5571da177e4SLinus Torvalds return -ENOMEM; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += utflen, o += unilen) { 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds /* convert from UTF-8 to Unicode */ 56374675a58SAlan Stern utflen = utf8_to_utf32(&in[i], in_len - i, &uni); 56474675a58SAlan Stern if (utflen < 0) 5651da177e4SLinus Torvalds goto conv_err; 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds /* convert from Unicode to nls */ 56874675a58SAlan Stern if (uni > MAX_WCHAR_T) 5691da177e4SLinus Torvalds goto conv_err; 57074675a58SAlan Stern unilen = nls->uni2char(uni, &result[o], in_len - o); 57174675a58SAlan Stern if (unilen < 0) 57274675a58SAlan Stern goto conv_err; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds result[o] = '\0'; 5751da177e4SLinus Torvalds *out_len = o; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds befs_debug(sb, "<--- utf2nls()"); 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds return o; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds conv_err: 5821da177e4SLinus Torvalds befs_error(sb, "Name using character set %s contains a character that " 5831da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 5841da177e4SLinus Torvalds befs_debug(sb, "<--- utf2nls()"); 5851da177e4SLinus Torvalds kfree(result); 5861da177e4SLinus Torvalds return -EILSEQ; 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds /** 5901da177e4SLinus Torvalds * befs_nls2utf - Convert NLS string to utf8 encodeing 5911da177e4SLinus Torvalds * @sb: Superblock 5921da177e4SLinus Torvalds * @src: Input string buffer in NLS format 5931da177e4SLinus Torvalds * @srclen: Length of input string in bytes 5944de151d8SAlexey Dobriyan * @dest: The output string in UTF-8 format 5951da177e4SLinus Torvalds * @destlen: Length of the output buffer 5961da177e4SLinus Torvalds * 5971da177e4SLinus Torvalds * Converts input string @src, which is in the format of the loaded NLS map, 5981da177e4SLinus Torvalds * into a utf8 string. 5991da177e4SLinus Torvalds * 6001da177e4SLinus Torvalds * The destination string @dest is allocated by this function and the caller is 6011da177e4SLinus Torvalds * responsible for freeing it with kfree() 6021da177e4SLinus Torvalds * 6031da177e4SLinus Torvalds * On return, *@destlen is the length of @dest in bytes. 6041da177e4SLinus Torvalds * 6051da177e4SLinus Torvalds * On success, the return value is the number of utf8 characters written to 6061da177e4SLinus Torvalds * the output buffer @dest. 6071da177e4SLinus Torvalds * 6081da177e4SLinus Torvalds * On Failure, a negative number coresponding to the error code is returned. 6091da177e4SLinus Torvalds */ 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds static int 6121da177e4SLinus Torvalds befs_nls2utf(struct super_block *sb, const char *in, 6131da177e4SLinus Torvalds int in_len, char **out, int *out_len) 6141da177e4SLinus Torvalds { 6151da177e4SLinus Torvalds struct nls_table *nls = BEFS_SB(sb)->nls; 6161da177e4SLinus Torvalds int i, o; 6171da177e4SLinus Torvalds wchar_t uni; 6181da177e4SLinus Torvalds int unilen, utflen; 6191da177e4SLinus Torvalds char *result; 62094f563c4SDiego Calleja /* There're nls characters that will translate to 3-chars-wide UTF-8 62194f563c4SDiego Calleja * characters, a additional byte is needed to save the final \0 62294f563c4SDiego Calleja * in special cases */ 62394f563c4SDiego Calleja int maxlen = (3 * in_len) + 1; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds befs_debug(sb, "---> nls2utf()\n"); 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds if (!nls) { 6281da177e4SLinus Torvalds befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 6291da177e4SLinus Torvalds return -EINVAL; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds *out = result = kmalloc(maxlen, GFP_NOFS); 6331da177e4SLinus Torvalds if (!*out) { 6341da177e4SLinus Torvalds befs_error(sb, "befs_nls2utf() cannot allocate memory"); 6351da177e4SLinus Torvalds *out_len = 0; 6361da177e4SLinus Torvalds return -ENOMEM; 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds for (i = o = 0; i < in_len; i += unilen, o += utflen) { 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds /* convert from nls to unicode */ 6421da177e4SLinus Torvalds unilen = nls->char2uni(&in[i], in_len - i, &uni); 64374675a58SAlan Stern if (unilen < 0) 6441da177e4SLinus Torvalds goto conv_err; 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds /* convert from unicode to UTF-8 */ 64774675a58SAlan Stern utflen = utf32_to_utf8(uni, &result[o], 3); 64874675a58SAlan Stern if (utflen <= 0) 6491da177e4SLinus Torvalds goto conv_err; 6501da177e4SLinus Torvalds } 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds result[o] = '\0'; 6531da177e4SLinus Torvalds *out_len = o; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds befs_debug(sb, "<--- nls2utf()"); 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds return i; 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds conv_err: 6601da177e4SLinus Torvalds befs_error(sb, "Name using charecter set %s contains a charecter that " 6611da177e4SLinus Torvalds "cannot be converted to unicode.", nls->charset); 6621da177e4SLinus Torvalds befs_debug(sb, "<--- nls2utf()"); 6631da177e4SLinus Torvalds kfree(result); 6641da177e4SLinus Torvalds return -EILSEQ; 6651da177e4SLinus Torvalds } 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds /** 6681da177e4SLinus Torvalds * Use the 6691da177e4SLinus Torvalds * 6701da177e4SLinus Torvalds */ 6711da177e4SLinus Torvalds enum { 6721da177e4SLinus Torvalds Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 6731da177e4SLinus Torvalds }; 6741da177e4SLinus Torvalds 675a447c093SSteven Whitehouse static const match_table_t befs_tokens = { 6761da177e4SLinus Torvalds {Opt_uid, "uid=%d"}, 6771da177e4SLinus Torvalds {Opt_gid, "gid=%d"}, 6781da177e4SLinus Torvalds {Opt_charset, "iocharset=%s"}, 6791da177e4SLinus Torvalds {Opt_debug, "debug"}, 6801da177e4SLinus Torvalds {Opt_err, NULL} 6811da177e4SLinus Torvalds }; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds static int 6841da177e4SLinus Torvalds parse_options(char *options, befs_mount_options * opts) 6851da177e4SLinus Torvalds { 6861da177e4SLinus Torvalds char *p; 6871da177e4SLinus Torvalds substring_t args[MAX_OPT_ARGS]; 6881da177e4SLinus Torvalds int option; 68931aba059SEric W. Biederman kuid_t uid; 69031aba059SEric W. Biederman kgid_t gid; 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds /* Initialize options */ 69331aba059SEric W. Biederman opts->uid = GLOBAL_ROOT_UID; 69431aba059SEric W. Biederman opts->gid = GLOBAL_ROOT_GID; 6951da177e4SLinus Torvalds opts->use_uid = 0; 6961da177e4SLinus Torvalds opts->use_gid = 0; 6971da177e4SLinus Torvalds opts->iocharset = NULL; 6981da177e4SLinus Torvalds opts->debug = 0; 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds if (!options) 7011da177e4SLinus Torvalds return 1; 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds while ((p = strsep(&options, ",")) != NULL) { 7041da177e4SLinus Torvalds int token; 7051da177e4SLinus Torvalds if (!*p) 7061da177e4SLinus Torvalds continue; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds token = match_token(p, befs_tokens, args); 7091da177e4SLinus Torvalds switch (token) { 7101da177e4SLinus Torvalds case Opt_uid: 7111da177e4SLinus Torvalds if (match_int(&args[0], &option)) 7121da177e4SLinus Torvalds return 0; 71331aba059SEric W. Biederman uid = INVALID_UID; 71431aba059SEric W. Biederman if (option >= 0) 71531aba059SEric W. Biederman uid = make_kuid(current_user_ns(), option); 71631aba059SEric W. Biederman if (!uid_valid(uid)) { 7171da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Invalid uid %d, " 7181da177e4SLinus Torvalds "using default\n", option); 7191da177e4SLinus Torvalds break; 7201da177e4SLinus Torvalds } 72131aba059SEric W. Biederman opts->uid = uid; 7221da177e4SLinus Torvalds opts->use_uid = 1; 7231da177e4SLinus Torvalds break; 7241da177e4SLinus Torvalds case Opt_gid: 7251da177e4SLinus Torvalds if (match_int(&args[0], &option)) 7261da177e4SLinus Torvalds return 0; 72731aba059SEric W. Biederman gid = INVALID_GID; 72831aba059SEric W. Biederman if (option >= 0) 72931aba059SEric W. Biederman gid = make_kgid(current_user_ns(), option); 73031aba059SEric W. Biederman if (!gid_valid(gid)) { 7311da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Invalid gid %d, " 7321da177e4SLinus Torvalds "using default\n", option); 7331da177e4SLinus Torvalds break; 7341da177e4SLinus Torvalds } 73531aba059SEric W. Biederman opts->gid = gid; 7361da177e4SLinus Torvalds opts->use_gid = 1; 7371da177e4SLinus Torvalds break; 7381da177e4SLinus Torvalds case Opt_charset: 7391da177e4SLinus Torvalds kfree(opts->iocharset); 7401da177e4SLinus Torvalds opts->iocharset = match_strdup(&args[0]); 7411da177e4SLinus Torvalds if (!opts->iocharset) { 7421da177e4SLinus Torvalds printk(KERN_ERR "BeFS: allocation failure for " 7431da177e4SLinus Torvalds "iocharset string\n"); 7441da177e4SLinus Torvalds return 0; 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds break; 7471da177e4SLinus Torvalds case Opt_debug: 7481da177e4SLinus Torvalds opts->debug = 1; 7491da177e4SLinus Torvalds break; 7501da177e4SLinus Torvalds default: 7511da177e4SLinus Torvalds printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 7521da177e4SLinus Torvalds "or missing value\n", p); 7531da177e4SLinus Torvalds return 0; 7541da177e4SLinus Torvalds } 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds return 1; 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds /* This function has the responsibiltiy of getting the 7601da177e4SLinus Torvalds * filesystem ready for unmounting. 76125985edcSLucas De Marchi * Basically, we free everything that we allocated in 7621da177e4SLinus Torvalds * befs_read_inode 7631da177e4SLinus Torvalds */ 7641da177e4SLinus Torvalds static void 7651da177e4SLinus Torvalds befs_put_super(struct super_block *sb) 7661da177e4SLinus Torvalds { 7671da177e4SLinus Torvalds kfree(BEFS_SB(sb)->mount_opts.iocharset); 7681da177e4SLinus Torvalds BEFS_SB(sb)->mount_opts.iocharset = NULL; 7691da177e4SLinus Torvalds unload_nls(BEFS_SB(sb)->nls); 7701da177e4SLinus Torvalds kfree(sb->s_fs_info); 7711da177e4SLinus Torvalds sb->s_fs_info = NULL; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Allocate private field of the superblock, fill it. 7751da177e4SLinus Torvalds * 7761da177e4SLinus Torvalds * Finish filling the public superblock fields 7771da177e4SLinus Torvalds * Make the root directory 7781da177e4SLinus Torvalds * Load a set of NLS translations if needed. 7791da177e4SLinus Torvalds */ 7801da177e4SLinus Torvalds static int 7811da177e4SLinus Torvalds befs_fill_super(struct super_block *sb, void *data, int silent) 7821da177e4SLinus Torvalds { 7831da177e4SLinus Torvalds struct buffer_head *bh; 7841da177e4SLinus Torvalds befs_sb_info *befs_sb; 7851da177e4SLinus Torvalds befs_super_block *disk_sb; 7861da177e4SLinus Torvalds struct inode *root; 78796eb5419SDavid Howells long ret = -EINVAL; 7881da177e4SLinus Torvalds const unsigned long sb_block = 0; 7891da177e4SLinus Torvalds const off_t x86_sb_off = 512; 7901da177e4SLinus Torvalds 791552c3c6cSMiklos Szeredi save_mount_options(sb, data); 792552c3c6cSMiklos Szeredi 7932d4319efSFabian Frederick sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); 7941da177e4SLinus Torvalds if (sb->s_fs_info == NULL) { 7951da177e4SLinus Torvalds printk(KERN_ERR 7961da177e4SLinus Torvalds "BeFS(%s): Unable to allocate memory for private " 7971da177e4SLinus Torvalds "portion of superblock. Bailing.\n", sb->s_id); 7980418726bSAdrian Bunk goto unacquire_none; 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds befs_sb = BEFS_SB(sb); 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds if (!parse_options((char *) data, &befs_sb->mount_opts)) { 8031da177e4SLinus Torvalds befs_error(sb, "cannot parse mount options"); 8040418726bSAdrian Bunk goto unacquire_priv_sbp; 8051da177e4SLinus Torvalds } 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds befs_debug(sb, "---> befs_fill_super()"); 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds #ifndef CONFIG_BEFS_RW 8101da177e4SLinus Torvalds if (!(sb->s_flags & MS_RDONLY)) { 8111da177e4SLinus Torvalds befs_warning(sb, 8121da177e4SLinus Torvalds "No write support. Marking filesystem read-only"); 8131da177e4SLinus Torvalds sb->s_flags |= MS_RDONLY; 8141da177e4SLinus Torvalds } 8151da177e4SLinus Torvalds #endif /* CONFIG_BEFS_RW */ 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds /* 8181da177e4SLinus Torvalds * Set dummy blocksize to read super block. 8191da177e4SLinus Torvalds * Will be set to real fs blocksize later. 8201da177e4SLinus Torvalds * 8211da177e4SLinus Torvalds * Linux 2.4.10 and later refuse to read blocks smaller than 8221da177e4SLinus Torvalds * the hardsect size for the device. But we also need to read at 8231da177e4SLinus Torvalds * least 1k to get the second 512 bytes of the volume. 8241da177e4SLinus Torvalds * -WD 10-26-01 8251da177e4SLinus Torvalds */ 8261da177e4SLinus Torvalds sb_min_blocksize(sb, 1024); 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds if (!(bh = sb_bread(sb, sb_block))) { 8291da177e4SLinus Torvalds befs_error(sb, "unable to read superblock"); 8300418726bSAdrian Bunk goto unacquire_priv_sbp; 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds /* account for offset of super block on x86 */ 8341da177e4SLinus Torvalds disk_sb = (befs_super_block *) bh->b_data; 835152b95a1SHarvey Harrison if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 836152b95a1SHarvey Harrison (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 8371da177e4SLinus Torvalds befs_debug(sb, "Using PPC superblock location"); 8381da177e4SLinus Torvalds } else { 8391da177e4SLinus Torvalds befs_debug(sb, "Using x86 superblock location"); 8401da177e4SLinus Torvalds disk_sb = 8411da177e4SLinus Torvalds (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 8421da177e4SLinus Torvalds } 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds if (befs_load_sb(sb, disk_sb) != BEFS_OK) 8450418726bSAdrian Bunk goto unacquire_bh; 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds befs_dump_super_block(sb, disk_sb); 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds brelse(bh); 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds if (befs_check_sb(sb) != BEFS_OK) 8520418726bSAdrian Bunk goto unacquire_priv_sbp; 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds if( befs_sb->num_blocks > ~((sector_t)0) ) { 8551da177e4SLinus Torvalds befs_error(sb, "blocks count: %Lu " 8561da177e4SLinus Torvalds "is larger than the host can use", 8571da177e4SLinus Torvalds befs_sb->num_blocks); 8580418726bSAdrian Bunk goto unacquire_priv_sbp; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds /* 8621da177e4SLinus Torvalds * set up enough so that it can read an inode 8631da177e4SLinus Torvalds * Fill in kernel superblock fields from private sb 8641da177e4SLinus Torvalds */ 8651da177e4SLinus Torvalds sb->s_magic = BEFS_SUPER_MAGIC; 8661da177e4SLinus Torvalds /* Set real blocksize of fs */ 8671da177e4SLinus Torvalds sb_set_blocksize(sb, (ulong) befs_sb->block_size); 868b87221deSAlexey Dobriyan sb->s_op = &befs_sops; 86996eb5419SDavid Howells root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 87096eb5419SDavid Howells if (IS_ERR(root)) { 87196eb5419SDavid Howells ret = PTR_ERR(root); 87296eb5419SDavid Howells goto unacquire_priv_sbp; 87396eb5419SDavid Howells } 87448fde701SAl Viro sb->s_root = d_make_root(root); 8751da177e4SLinus Torvalds if (!sb->s_root) { 8761da177e4SLinus Torvalds befs_error(sb, "get root inode failed"); 8770418726bSAdrian Bunk goto unacquire_priv_sbp; 8781da177e4SLinus Torvalds } 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds /* load nls library */ 8811da177e4SLinus Torvalds if (befs_sb->mount_opts.iocharset) { 8821da177e4SLinus Torvalds befs_debug(sb, "Loading nls: %s", 8831da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8841da177e4SLinus Torvalds befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 8851da177e4SLinus Torvalds if (!befs_sb->nls) { 8861da177e4SLinus Torvalds befs_warning(sb, "Cannot load nls %s" 8871da177e4SLinus Torvalds " loading default nls", 8881da177e4SLinus Torvalds befs_sb->mount_opts.iocharset); 8891da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds /* load default nls if none is specified in mount options */ 8921da177e4SLinus Torvalds } else { 8931da177e4SLinus Torvalds befs_debug(sb, "Loading default nls"); 8941da177e4SLinus Torvalds befs_sb->nls = load_nls_default(); 8951da177e4SLinus Torvalds } 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds return 0; 8981da177e4SLinus Torvalds /*****************/ 8990418726bSAdrian Bunk unacquire_bh: 9001da177e4SLinus Torvalds brelse(bh); 9011da177e4SLinus Torvalds 9020418726bSAdrian Bunk unacquire_priv_sbp: 9038dd5ca53SAl Viro kfree(befs_sb->mount_opts.iocharset); 9041da177e4SLinus Torvalds kfree(sb->s_fs_info); 9051da177e4SLinus Torvalds 9060418726bSAdrian Bunk unacquire_none: 9071da177e4SLinus Torvalds sb->s_fs_info = NULL; 90896eb5419SDavid Howells return ret; 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds static int 9121da177e4SLinus Torvalds befs_remount(struct super_block *sb, int *flags, char *data) 9131da177e4SLinus Torvalds { 9141da177e4SLinus Torvalds if (!(*flags & MS_RDONLY)) 9151da177e4SLinus Torvalds return -EINVAL; 9161da177e4SLinus Torvalds return 0; 9171da177e4SLinus Torvalds } 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds static int 920726c3342SDavid Howells befs_statfs(struct dentry *dentry, struct kstatfs *buf) 9211da177e4SLinus Torvalds { 922726c3342SDavid Howells struct super_block *sb = dentry->d_sb; 9238587246aSColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds befs_debug(sb, "---> befs_statfs()"); 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds buf->f_type = BEFS_SUPER_MAGIC; 9281da177e4SLinus Torvalds buf->f_bsize = sb->s_blocksize; 9291da177e4SLinus Torvalds buf->f_blocks = BEFS_SB(sb)->num_blocks; 9301da177e4SLinus Torvalds buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 9311da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree; 9321da177e4SLinus Torvalds buf->f_files = 0; /* UNKNOWN */ 9331da177e4SLinus Torvalds buf->f_ffree = 0; /* UNKNOWN */ 9348587246aSColy Li buf->f_fsid.val[0] = (u32)id; 9358587246aSColy Li buf->f_fsid.val[1] = (u32)(id >> 32); 9361da177e4SLinus Torvalds buf->f_namelen = BEFS_NAME_LEN; 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds befs_debug(sb, "<--- befs_statfs()"); 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds return 0; 9411da177e4SLinus Torvalds } 9421da177e4SLinus Torvalds 943152a0836SAl Viro static struct dentry * 944152a0836SAl Viro befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, 945152a0836SAl Viro void *data) 9461da177e4SLinus Torvalds { 947152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds static struct file_system_type befs_fs_type = { 9511da177e4SLinus Torvalds .owner = THIS_MODULE, 9521da177e4SLinus Torvalds .name = "befs", 953152a0836SAl Viro .mount = befs_mount, 9541da177e4SLinus Torvalds .kill_sb = kill_block_super, 9551da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 9561da177e4SLinus Torvalds }; 9577f78e035SEric W. Biederman MODULE_ALIAS_FS("befs"); 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds static int __init 9601da177e4SLinus Torvalds init_befs_fs(void) 9611da177e4SLinus Torvalds { 9621da177e4SLinus Torvalds int err; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds err = befs_init_inodecache(); 9671da177e4SLinus Torvalds if (err) 9680418726bSAdrian Bunk goto unacquire_none; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds err = register_filesystem(&befs_fs_type); 9711da177e4SLinus Torvalds if (err) 9720418726bSAdrian Bunk goto unacquire_inodecache; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds return 0; 9751da177e4SLinus Torvalds 9760418726bSAdrian Bunk unacquire_inodecache: 9771da177e4SLinus Torvalds befs_destroy_inodecache(); 9781da177e4SLinus Torvalds 9790418726bSAdrian Bunk unacquire_none: 9801da177e4SLinus Torvalds return err; 9811da177e4SLinus Torvalds } 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds static void __exit 9841da177e4SLinus Torvalds exit_befs_fs(void) 9851da177e4SLinus Torvalds { 9861da177e4SLinus Torvalds befs_destroy_inodecache(); 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds unregister_filesystem(&befs_fs_type); 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds /* 9921da177e4SLinus Torvalds Macros that typecheck the init and exit functions, 9931da177e4SLinus Torvalds ensures that they are called at init and cleanup, 9941da177e4SLinus Torvalds and eliminates warnings about unused functions. 9951da177e4SLinus Torvalds */ 9961da177e4SLinus Torvalds module_init(init_befs_fs) 9971da177e4SLinus Torvalds module_exit(exit_befs_fs) 998