11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/ufs/namei.c 31da177e4SLinus Torvalds * 4b71034e5SEvgeniy Dushistov * Migration to usage of "page cache" on May 2006 by 5b71034e5SEvgeniy Dushistov * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base. 6b71034e5SEvgeniy Dushistov * 71da177e4SLinus Torvalds * Copyright (C) 1998 81da177e4SLinus Torvalds * Daniel Pirkl <daniel.pirkl@email.cz> 91da177e4SLinus Torvalds * Charles University, Faculty of Mathematics and Physics 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * from 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * linux/fs/ext2/namei.c 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * Copyright (C) 1992, 1993, 1994, 1995 161da177e4SLinus Torvalds * Remy Card (card@masi.ibp.fr) 171da177e4SLinus Torvalds * Laboratoire MASI - Institut Blaise Pascal 181da177e4SLinus Torvalds * Universite Pierre et Marie Curie (Paris VI) 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds * from 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds * linux/fs/minix/namei.c 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * Copyright (C) 1991, 1992 Linus Torvalds 251da177e4SLinus Torvalds * 261da177e4SLinus Torvalds * Big-endian to little-endian byte-swapping/bitmaps by 271da177e4SLinus Torvalds * David S. Miller (davem@caip.rutgers.edu), 1995 281da177e4SLinus Torvalds */ 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include <linux/time.h> 311da177e4SLinus Torvalds #include <linux/fs.h> 32e5420598SMike Frysinger 33e5420598SMike Frysinger #include "ufs_fs.h" 34bcd6d4ecSChristoph Hellwig #include "ufs.h" 351da177e4SLinus Torvalds #include "util.h" 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) 381da177e4SLinus Torvalds { 391da177e4SLinus Torvalds int err = ufs_add_link(dentry, inode); 401da177e4SLinus Torvalds if (!err) { 41e4502c63SAl Viro unlock_new_inode(inode); 421da177e4SLinus Torvalds d_instantiate(dentry, inode); 431da177e4SLinus Torvalds return 0; 441da177e4SLinus Torvalds } 453257545eSAlexey Dobriyan inode_dec_link_count(inode); 46e4502c63SAl Viro unlock_new_inode(inode); 471da177e4SLinus Torvalds iput(inode); 481da177e4SLinus Torvalds return err; 491da177e4SLinus Torvalds } 501da177e4SLinus Torvalds 5100cd8dd3SAl Viro static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) 521da177e4SLinus Torvalds { 531da177e4SLinus Torvalds struct inode * inode = NULL; 541da177e4SLinus Torvalds ino_t ino; 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds if (dentry->d_name.len > UFS_MAXNAMLEN) 571da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 581da177e4SLinus Torvalds 59788257d6SArnd Bergmann lock_ufs(dir->i_sb); 6008049707SAlexey Dobriyan ino = ufs_inode_by_name(dir, &dentry->d_name); 61642c937bSAl Viro if (ino) 62b55c460dSDavid Howells inode = ufs_iget(dir->i_sb, ino); 63788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 64642c937bSAl Viro return d_splice_alias(inode, dentry); 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds /* 681da177e4SLinus Torvalds * By the time this is called, we already have created 691da177e4SLinus Torvalds * the directory cache entry for the new file, but it 701da177e4SLinus Torvalds * is so far negative - it has no inode. 711da177e4SLinus Torvalds * 721da177e4SLinus Torvalds * If the create succeeds, we fill in the inode information 731da177e4SLinus Torvalds * with d_instantiate(). 741da177e4SLinus Torvalds */ 754acdaf27SAl Viro static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode, 76ebfc3b49SAl Viro bool excl) 771da177e4SLinus Torvalds { 78abf5d15fSEvgeniy Dushistov struct inode *inode; 79abf5d15fSEvgeniy Dushistov int err; 80abf5d15fSEvgeniy Dushistov 81abf5d15fSEvgeniy Dushistov UFSD("BEGIN\n"); 82907f4554SChristoph Hellwig 83abf5d15fSEvgeniy Dushistov inode = ufs_new_inode(dir, mode); 84abf5d15fSEvgeniy Dushistov err = PTR_ERR(inode); 85abf5d15fSEvgeniy Dushistov 861da177e4SLinus Torvalds if (!IS_ERR(inode)) { 871da177e4SLinus Torvalds inode->i_op = &ufs_file_inode_operations; 881da177e4SLinus Torvalds inode->i_fop = &ufs_file_operations; 891da177e4SLinus Torvalds inode->i_mapping->a_ops = &ufs_aops; 901da177e4SLinus Torvalds mark_inode_dirty(inode); 91788257d6SArnd Bergmann lock_ufs(dir->i_sb); 921da177e4SLinus Torvalds err = ufs_add_nondir(dentry, inode); 93788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 941da177e4SLinus Torvalds } 95abf5d15fSEvgeniy Dushistov UFSD("END: err=%d\n", err); 961da177e4SLinus Torvalds return err; 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 991a67aafbSAl Viro static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds struct inode *inode; 1021da177e4SLinus Torvalds int err; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds if (!old_valid_dev(rdev)) 1051da177e4SLinus Torvalds return -EINVAL; 106907f4554SChristoph Hellwig 1071da177e4SLinus Torvalds inode = ufs_new_inode(dir, mode); 1081da177e4SLinus Torvalds err = PTR_ERR(inode); 1091da177e4SLinus Torvalds if (!IS_ERR(inode)) { 1101da177e4SLinus Torvalds init_special_inode(inode, mode, rdev); 1111da177e4SLinus Torvalds ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); 1121da177e4SLinus Torvalds mark_inode_dirty(inode); 113788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1141da177e4SLinus Torvalds err = ufs_add_nondir(dentry, inode); 115788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds return err; 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds static int ufs_symlink (struct inode * dir, struct dentry * dentry, 1211da177e4SLinus Torvalds const char * symname) 1221da177e4SLinus Torvalds { 1231da177e4SLinus Torvalds struct super_block * sb = dir->i_sb; 1241da177e4SLinus Torvalds int err = -ENAMETOOLONG; 1251da177e4SLinus Torvalds unsigned l = strlen(symname)+1; 1261da177e4SLinus Torvalds struct inode * inode; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds if (l > sb->s_blocksize) 129344fe786SJosh Triplett goto out_notlocked; 1301da177e4SLinus Torvalds 131*13b987eaSFabian Frederick lock_ufs(dir->i_sb); 1321da177e4SLinus Torvalds inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); 1331da177e4SLinus Torvalds err = PTR_ERR(inode); 1341da177e4SLinus Torvalds if (IS_ERR(inode)) 135*13b987eaSFabian Frederick goto out; 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { 1381da177e4SLinus Torvalds /* slow symlink */ 139311b9549SDmitry Monakhov inode->i_op = &ufs_symlink_inode_operations; 1401da177e4SLinus Torvalds inode->i_mapping->a_ops = &ufs_aops; 1411da177e4SLinus Torvalds err = page_symlink(inode, symname, l); 1421da177e4SLinus Torvalds if (err) 1431da177e4SLinus Torvalds goto out_fail; 1441da177e4SLinus Torvalds } else { 1451da177e4SLinus Torvalds /* fast symlink */ 1461da177e4SLinus Torvalds inode->i_op = &ufs_fast_symlink_inode_operations; 147723be1f3SDuane Griffin memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l); 1481da177e4SLinus Torvalds inode->i_size = l-1; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds mark_inode_dirty(inode); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds err = ufs_add_nondir(dentry, inode); 1531da177e4SLinus Torvalds out: 154788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 155344fe786SJosh Triplett out_notlocked: 1561da177e4SLinus Torvalds return err; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds out_fail: 1593257545eSAlexey Dobriyan inode_dec_link_count(inode); 160e4502c63SAl Viro unlock_new_inode(inode); 1611da177e4SLinus Torvalds iput(inode); 1621da177e4SLinus Torvalds goto out; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds static int ufs_link (struct dentry * old_dentry, struct inode * dir, 1661da177e4SLinus Torvalds struct dentry *dentry) 1671da177e4SLinus Torvalds { 1682b0143b5SDavid Howells struct inode *inode = d_inode(old_dentry); 1691da177e4SLinus Torvalds int error; 1701da177e4SLinus Torvalds 171788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds inode->i_ctime = CURRENT_TIME_SEC; 1743257545eSAlexey Dobriyan inode_inc_link_count(inode); 1757de9c6eeSAl Viro ihold(inode); 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds error = ufs_add_nondir(dentry, inode); 178788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 1791da177e4SLinus Torvalds return error; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 18218bb1db3SAl Viro static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds struct inode * inode; 1858de52778SAl Viro int err; 1861da177e4SLinus Torvalds 187*13b987eaSFabian Frederick lock_ufs(dir->i_sb); 188*13b987eaSFabian Frederick inode_inc_link_count(dir); 189*13b987eaSFabian Frederick 1901da177e4SLinus Torvalds inode = ufs_new_inode(dir, S_IFDIR|mode); 191*13b987eaSFabian Frederick err = PTR_ERR(inode); 1921da177e4SLinus Torvalds if (IS_ERR(inode)) 193*13b987eaSFabian Frederick goto out_dir; 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds inode->i_op = &ufs_dir_inode_operations; 1961da177e4SLinus Torvalds inode->i_fop = &ufs_dir_operations; 197826843a3SEvgeniy Dushistov inode->i_mapping->a_ops = &ufs_aops; 1981da177e4SLinus Torvalds 1993257545eSAlexey Dobriyan inode_inc_link_count(inode); 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds err = ufs_make_empty(inode, dir); 2021da177e4SLinus Torvalds if (err) 2031da177e4SLinus Torvalds goto out_fail; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds err = ufs_add_link(dentry, inode); 2061da177e4SLinus Torvalds if (err) 2071da177e4SLinus Torvalds goto out_fail; 208788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds d_instantiate(dentry, inode); 2111da177e4SLinus Torvalds out: 2121da177e4SLinus Torvalds return err; 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds out_fail: 2153257545eSAlexey Dobriyan inode_dec_link_count(inode); 2163257545eSAlexey Dobriyan inode_dec_link_count(inode); 217e4502c63SAl Viro unlock_new_inode(inode); 2181da177e4SLinus Torvalds iput (inode); 219*13b987eaSFabian Frederick out_dir: 2203257545eSAlexey Dobriyan inode_dec_link_count(dir); 221788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2221da177e4SLinus Torvalds goto out; 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds static int ufs_unlink(struct inode *dir, struct dentry *dentry) 2261da177e4SLinus Torvalds { 2272b0143b5SDavid Howells struct inode * inode = d_inode(dentry); 2281da177e4SLinus Torvalds struct ufs_dir_entry *de; 229b71034e5SEvgeniy Dushistov struct page *page; 2301da177e4SLinus Torvalds int err = -ENOENT; 2311da177e4SLinus Torvalds 23208049707SAlexey Dobriyan de = ufs_find_entry(dir, &dentry->d_name, &page); 2331da177e4SLinus Torvalds if (!de) 2341da177e4SLinus Torvalds goto out; 2351da177e4SLinus Torvalds 236b71034e5SEvgeniy Dushistov err = ufs_delete_entry(dir, de, page); 2371da177e4SLinus Torvalds if (err) 2381da177e4SLinus Torvalds goto out; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds inode->i_ctime = dir->i_ctime; 2413257545eSAlexey Dobriyan inode_dec_link_count(inode); 2421da177e4SLinus Torvalds err = 0; 2431da177e4SLinus Torvalds out: 2441da177e4SLinus Torvalds return err; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds static int ufs_rmdir (struct inode * dir, struct dentry *dentry) 2481da177e4SLinus Torvalds { 2492b0143b5SDavid Howells struct inode * inode = d_inode(dentry); 2501da177e4SLinus Torvalds int err= -ENOTEMPTY; 2511da177e4SLinus Torvalds 252788257d6SArnd Bergmann lock_ufs(dir->i_sb); 2531da177e4SLinus Torvalds if (ufs_empty_dir (inode)) { 2541da177e4SLinus Torvalds err = ufs_unlink(dir, dentry); 2551da177e4SLinus Torvalds if (!err) { 2561da177e4SLinus Torvalds inode->i_size = 0; 2573257545eSAlexey Dobriyan inode_dec_link_count(inode); 2583257545eSAlexey Dobriyan inode_dec_link_count(dir); 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds } 261788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2621da177e4SLinus Torvalds return err; 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, 2661da177e4SLinus Torvalds struct inode *new_dir, struct dentry *new_dentry) 2671da177e4SLinus Torvalds { 2682b0143b5SDavid Howells struct inode *old_inode = d_inode(old_dentry); 2692b0143b5SDavid Howells struct inode *new_inode = d_inode(new_dentry); 270b71034e5SEvgeniy Dushistov struct page *dir_page = NULL; 2711da177e4SLinus Torvalds struct ufs_dir_entry * dir_de = NULL; 272b71034e5SEvgeniy Dushistov struct page *old_page; 2731da177e4SLinus Torvalds struct ufs_dir_entry *old_de; 2741da177e4SLinus Torvalds int err = -ENOENT; 2751da177e4SLinus Torvalds 27608049707SAlexey Dobriyan old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); 2771da177e4SLinus Torvalds if (!old_de) 2781da177e4SLinus Torvalds goto out; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds if (S_ISDIR(old_inode->i_mode)) { 2811da177e4SLinus Torvalds err = -EIO; 282b71034e5SEvgeniy Dushistov dir_de = ufs_dotdot(old_inode, &dir_page); 2831da177e4SLinus Torvalds if (!dir_de) 2841da177e4SLinus Torvalds goto out_old; 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds if (new_inode) { 288b71034e5SEvgeniy Dushistov struct page *new_page; 2891da177e4SLinus Torvalds struct ufs_dir_entry *new_de; 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds err = -ENOTEMPTY; 2921da177e4SLinus Torvalds if (dir_de && !ufs_empty_dir(new_inode)) 2931da177e4SLinus Torvalds goto out_dir; 294b71034e5SEvgeniy Dushistov 2951da177e4SLinus Torvalds err = -ENOENT; 29608049707SAlexey Dobriyan new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); 2971da177e4SLinus Torvalds if (!new_de) 2981da177e4SLinus Torvalds goto out_dir; 299b71034e5SEvgeniy Dushistov ufs_set_link(new_dir, new_de, new_page, old_inode); 3001da177e4SLinus Torvalds new_inode->i_ctime = CURRENT_TIME_SEC; 3011da177e4SLinus Torvalds if (dir_de) 3029a53c3a7SDave Hansen drop_nlink(new_inode); 3033257545eSAlexey Dobriyan inode_dec_link_count(new_inode); 3041da177e4SLinus Torvalds } else { 3051da177e4SLinus Torvalds err = ufs_add_link(new_dentry, old_inode); 30637750cddSAl Viro if (err) 3071da177e4SLinus Torvalds goto out_dir; 3081da177e4SLinus Torvalds if (dir_de) 3093257545eSAlexey Dobriyan inode_inc_link_count(new_dir); 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 312b71034e5SEvgeniy Dushistov /* 313b71034e5SEvgeniy Dushistov * Like most other Unix systems, set the ctime for inodes on a 314b71034e5SEvgeniy Dushistov * rename. 315b71034e5SEvgeniy Dushistov */ 316b71034e5SEvgeniy Dushistov old_inode->i_ctime = CURRENT_TIME_SEC; 3171da177e4SLinus Torvalds 318b71034e5SEvgeniy Dushistov ufs_delete_entry(old_dir, old_de, old_page); 31937750cddSAl Viro mark_inode_dirty(old_inode); 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds if (dir_de) { 322b71034e5SEvgeniy Dushistov ufs_set_link(old_inode, dir_de, dir_page, new_dir); 3233257545eSAlexey Dobriyan inode_dec_link_count(old_dir); 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds return 0; 3261da177e4SLinus Torvalds 327b71034e5SEvgeniy Dushistov 3281da177e4SLinus Torvalds out_dir: 329b71034e5SEvgeniy Dushistov if (dir_de) { 330b71034e5SEvgeniy Dushistov kunmap(dir_page); 331b71034e5SEvgeniy Dushistov page_cache_release(dir_page); 332b71034e5SEvgeniy Dushistov } 3331da177e4SLinus Torvalds out_old: 334b71034e5SEvgeniy Dushistov kunmap(old_page); 335b71034e5SEvgeniy Dushistov page_cache_release(old_page); 3361da177e4SLinus Torvalds out: 3371da177e4SLinus Torvalds return err; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 340c5ef1c42SArjan van de Ven const struct inode_operations ufs_dir_inode_operations = { 3411da177e4SLinus Torvalds .create = ufs_create, 3421da177e4SLinus Torvalds .lookup = ufs_lookup, 3431da177e4SLinus Torvalds .link = ufs_link, 3441da177e4SLinus Torvalds .unlink = ufs_unlink, 3451da177e4SLinus Torvalds .symlink = ufs_symlink, 3461da177e4SLinus Torvalds .mkdir = ufs_mkdir, 3471da177e4SLinus Torvalds .rmdir = ufs_rmdir, 3481da177e4SLinus Torvalds .mknod = ufs_mknod, 3491da177e4SLinus Torvalds .rename = ufs_rename, 3501da177e4SLinus Torvalds }; 351