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) { 411da177e4SLinus Torvalds d_instantiate(dentry, inode); 421da177e4SLinus Torvalds return 0; 431da177e4SLinus Torvalds } 443257545eSAlexey Dobriyan inode_dec_link_count(inode); 451da177e4SLinus Torvalds iput(inode); 461da177e4SLinus Torvalds return err; 471da177e4SLinus Torvalds } 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) 501da177e4SLinus Torvalds { 511da177e4SLinus Torvalds struct inode * inode = NULL; 521da177e4SLinus Torvalds ino_t ino; 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds if (dentry->d_name.len > UFS_MAXNAMLEN) 551da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 561da177e4SLinus Torvalds 57788257d6SArnd Bergmann lock_ufs(dir->i_sb); 5808049707SAlexey Dobriyan ino = ufs_inode_by_name(dir, &dentry->d_name); 59642c937bSAl Viro if (ino) 60b55c460dSDavid Howells inode = ufs_iget(dir->i_sb, ino); 61788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 62642c937bSAl Viro return d_splice_alias(inode, dentry); 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* 661da177e4SLinus Torvalds * By the time this is called, we already have created 671da177e4SLinus Torvalds * the directory cache entry for the new file, but it 681da177e4SLinus Torvalds * is so far negative - it has no inode. 691da177e4SLinus Torvalds * 701da177e4SLinus Torvalds * If the create succeeds, we fill in the inode information 711da177e4SLinus Torvalds * with d_instantiate(). 721da177e4SLinus Torvalds */ 734acdaf27SAl Viro static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode, 741da177e4SLinus Torvalds struct nameidata *nd) 751da177e4SLinus Torvalds { 76abf5d15fSEvgeniy Dushistov struct inode *inode; 77abf5d15fSEvgeniy Dushistov int err; 78abf5d15fSEvgeniy Dushistov 79abf5d15fSEvgeniy Dushistov UFSD("BEGIN\n"); 80907f4554SChristoph Hellwig 81abf5d15fSEvgeniy Dushistov inode = ufs_new_inode(dir, mode); 82abf5d15fSEvgeniy Dushistov err = PTR_ERR(inode); 83abf5d15fSEvgeniy Dushistov 841da177e4SLinus Torvalds if (!IS_ERR(inode)) { 851da177e4SLinus Torvalds inode->i_op = &ufs_file_inode_operations; 861da177e4SLinus Torvalds inode->i_fop = &ufs_file_operations; 871da177e4SLinus Torvalds inode->i_mapping->a_ops = &ufs_aops; 881da177e4SLinus Torvalds mark_inode_dirty(inode); 89788257d6SArnd Bergmann lock_ufs(dir->i_sb); 901da177e4SLinus Torvalds err = ufs_add_nondir(dentry, inode); 91788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 921da177e4SLinus Torvalds } 93abf5d15fSEvgeniy Dushistov UFSD("END: err=%d\n", err); 941da177e4SLinus Torvalds return err; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971a67aafbSAl Viro static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 981da177e4SLinus Torvalds { 991da177e4SLinus Torvalds struct inode *inode; 1001da177e4SLinus Torvalds int err; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds if (!old_valid_dev(rdev)) 1031da177e4SLinus Torvalds return -EINVAL; 104907f4554SChristoph Hellwig 1051da177e4SLinus Torvalds inode = ufs_new_inode(dir, mode); 1061da177e4SLinus Torvalds err = PTR_ERR(inode); 1071da177e4SLinus Torvalds if (!IS_ERR(inode)) { 1081da177e4SLinus Torvalds init_special_inode(inode, mode, rdev); 1091da177e4SLinus Torvalds ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); 1101da177e4SLinus Torvalds mark_inode_dirty(inode); 111788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1121da177e4SLinus Torvalds err = ufs_add_nondir(dentry, inode); 113788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds return err; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds static int ufs_symlink (struct inode * dir, struct dentry * dentry, 1191da177e4SLinus Torvalds const char * symname) 1201da177e4SLinus Torvalds { 1211da177e4SLinus Torvalds struct super_block * sb = dir->i_sb; 1221da177e4SLinus Torvalds int err = -ENAMETOOLONG; 1231da177e4SLinus Torvalds unsigned l = strlen(symname)+1; 1241da177e4SLinus Torvalds struct inode * inode; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds if (l > sb->s_blocksize) 127344fe786SJosh Triplett goto out_notlocked; 1281da177e4SLinus Torvalds 129788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1301da177e4SLinus Torvalds inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); 1311da177e4SLinus Torvalds err = PTR_ERR(inode); 1321da177e4SLinus Torvalds if (IS_ERR(inode)) 1331da177e4SLinus Torvalds goto out; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { 1361da177e4SLinus Torvalds /* slow symlink */ 137311b9549SDmitry Monakhov inode->i_op = &ufs_symlink_inode_operations; 1381da177e4SLinus Torvalds inode->i_mapping->a_ops = &ufs_aops; 1391da177e4SLinus Torvalds err = page_symlink(inode, symname, l); 1401da177e4SLinus Torvalds if (err) 1411da177e4SLinus Torvalds goto out_fail; 1421da177e4SLinus Torvalds } else { 1431da177e4SLinus Torvalds /* fast symlink */ 1441da177e4SLinus Torvalds inode->i_op = &ufs_fast_symlink_inode_operations; 145723be1f3SDuane Griffin memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l); 1461da177e4SLinus Torvalds inode->i_size = l-1; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds mark_inode_dirty(inode); 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds err = ufs_add_nondir(dentry, inode); 1511da177e4SLinus Torvalds out: 152788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 153344fe786SJosh Triplett out_notlocked: 1541da177e4SLinus Torvalds return err; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds out_fail: 1573257545eSAlexey Dobriyan inode_dec_link_count(inode); 1581da177e4SLinus Torvalds iput(inode); 1591da177e4SLinus Torvalds goto out; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static int ufs_link (struct dentry * old_dentry, struct inode * dir, 1631da177e4SLinus Torvalds struct dentry *dentry) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds struct inode *inode = old_dentry->d_inode; 1661da177e4SLinus Torvalds int error; 1671da177e4SLinus Torvalds 168788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds inode->i_ctime = CURRENT_TIME_SEC; 1713257545eSAlexey Dobriyan inode_inc_link_count(inode); 1727de9c6eeSAl Viro ihold(inode); 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds error = ufs_add_nondir(dentry, inode); 175788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 1761da177e4SLinus Torvalds return error; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 17918bb1db3SAl Viro static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds struct inode * inode; 182*8de52778SAl Viro int err; 1831da177e4SLinus Torvalds 184788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1853257545eSAlexey Dobriyan inode_inc_link_count(dir); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds inode = ufs_new_inode(dir, S_IFDIR|mode); 1881da177e4SLinus Torvalds err = PTR_ERR(inode); 1891da177e4SLinus Torvalds if (IS_ERR(inode)) 1901da177e4SLinus Torvalds goto out_dir; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds inode->i_op = &ufs_dir_inode_operations; 1931da177e4SLinus Torvalds inode->i_fop = &ufs_dir_operations; 194826843a3SEvgeniy Dushistov inode->i_mapping->a_ops = &ufs_aops; 1951da177e4SLinus Torvalds 1963257545eSAlexey Dobriyan inode_inc_link_count(inode); 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds err = ufs_make_empty(inode, dir); 1991da177e4SLinus Torvalds if (err) 2001da177e4SLinus Torvalds goto out_fail; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds err = ufs_add_link(dentry, inode); 2031da177e4SLinus Torvalds if (err) 2041da177e4SLinus Torvalds goto out_fail; 205788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds d_instantiate(dentry, inode); 2081da177e4SLinus Torvalds out: 2091da177e4SLinus Torvalds return err; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds out_fail: 2123257545eSAlexey Dobriyan inode_dec_link_count(inode); 2133257545eSAlexey Dobriyan inode_dec_link_count(inode); 2141da177e4SLinus Torvalds iput (inode); 2151da177e4SLinus Torvalds out_dir: 2163257545eSAlexey Dobriyan inode_dec_link_count(dir); 217788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2181da177e4SLinus Torvalds goto out; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds static int ufs_unlink(struct inode *dir, struct dentry *dentry) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 2241da177e4SLinus Torvalds struct ufs_dir_entry *de; 225b71034e5SEvgeniy Dushistov struct page *page; 2261da177e4SLinus Torvalds int err = -ENOENT; 2271da177e4SLinus Torvalds 22808049707SAlexey Dobriyan de = ufs_find_entry(dir, &dentry->d_name, &page); 2291da177e4SLinus Torvalds if (!de) 2301da177e4SLinus Torvalds goto out; 2311da177e4SLinus Torvalds 232b71034e5SEvgeniy Dushistov err = ufs_delete_entry(dir, de, page); 2331da177e4SLinus Torvalds if (err) 2341da177e4SLinus Torvalds goto out; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds inode->i_ctime = dir->i_ctime; 2373257545eSAlexey Dobriyan inode_dec_link_count(inode); 2381da177e4SLinus Torvalds err = 0; 2391da177e4SLinus Torvalds out: 2401da177e4SLinus Torvalds return err; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds static int ufs_rmdir (struct inode * dir, struct dentry *dentry) 2441da177e4SLinus Torvalds { 2451da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 2461da177e4SLinus Torvalds int err= -ENOTEMPTY; 2471da177e4SLinus Torvalds 248788257d6SArnd Bergmann lock_ufs(dir->i_sb); 2491da177e4SLinus Torvalds if (ufs_empty_dir (inode)) { 2501da177e4SLinus Torvalds err = ufs_unlink(dir, dentry); 2511da177e4SLinus Torvalds if (!err) { 2521da177e4SLinus Torvalds inode->i_size = 0; 2533257545eSAlexey Dobriyan inode_dec_link_count(inode); 2543257545eSAlexey Dobriyan inode_dec_link_count(dir); 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds } 257788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2581da177e4SLinus Torvalds return err; 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, 2621da177e4SLinus Torvalds struct inode *new_dir, struct dentry *new_dentry) 2631da177e4SLinus Torvalds { 2641da177e4SLinus Torvalds struct inode *old_inode = old_dentry->d_inode; 2651da177e4SLinus Torvalds struct inode *new_inode = new_dentry->d_inode; 266b71034e5SEvgeniy Dushistov struct page *dir_page = NULL; 2671da177e4SLinus Torvalds struct ufs_dir_entry * dir_de = NULL; 268b71034e5SEvgeniy Dushistov struct page *old_page; 2691da177e4SLinus Torvalds struct ufs_dir_entry *old_de; 2701da177e4SLinus Torvalds int err = -ENOENT; 2711da177e4SLinus Torvalds 27208049707SAlexey Dobriyan old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); 2731da177e4SLinus Torvalds if (!old_de) 2741da177e4SLinus Torvalds goto out; 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds if (S_ISDIR(old_inode->i_mode)) { 2771da177e4SLinus Torvalds err = -EIO; 278b71034e5SEvgeniy Dushistov dir_de = ufs_dotdot(old_inode, &dir_page); 2791da177e4SLinus Torvalds if (!dir_de) 2801da177e4SLinus Torvalds goto out_old; 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds if (new_inode) { 284b71034e5SEvgeniy Dushistov struct page *new_page; 2851da177e4SLinus Torvalds struct ufs_dir_entry *new_de; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds err = -ENOTEMPTY; 2881da177e4SLinus Torvalds if (dir_de && !ufs_empty_dir(new_inode)) 2891da177e4SLinus Torvalds goto out_dir; 290b71034e5SEvgeniy Dushistov 2911da177e4SLinus Torvalds err = -ENOENT; 29208049707SAlexey Dobriyan new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); 2931da177e4SLinus Torvalds if (!new_de) 2941da177e4SLinus Torvalds goto out_dir; 295b71034e5SEvgeniy Dushistov ufs_set_link(new_dir, new_de, new_page, old_inode); 2961da177e4SLinus Torvalds new_inode->i_ctime = CURRENT_TIME_SEC; 2971da177e4SLinus Torvalds if (dir_de) 2989a53c3a7SDave Hansen drop_nlink(new_inode); 2993257545eSAlexey Dobriyan inode_dec_link_count(new_inode); 3001da177e4SLinus Torvalds } else { 3011da177e4SLinus Torvalds err = ufs_add_link(new_dentry, old_inode); 30237750cddSAl Viro if (err) 3031da177e4SLinus Torvalds goto out_dir; 3041da177e4SLinus Torvalds if (dir_de) 3053257545eSAlexey Dobriyan inode_inc_link_count(new_dir); 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 308b71034e5SEvgeniy Dushistov /* 309b71034e5SEvgeniy Dushistov * Like most other Unix systems, set the ctime for inodes on a 310b71034e5SEvgeniy Dushistov * rename. 311b71034e5SEvgeniy Dushistov */ 312b71034e5SEvgeniy Dushistov old_inode->i_ctime = CURRENT_TIME_SEC; 3131da177e4SLinus Torvalds 314b71034e5SEvgeniy Dushistov ufs_delete_entry(old_dir, old_de, old_page); 31537750cddSAl Viro mark_inode_dirty(old_inode); 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds if (dir_de) { 318b71034e5SEvgeniy Dushistov ufs_set_link(old_inode, dir_de, dir_page, new_dir); 3193257545eSAlexey Dobriyan inode_dec_link_count(old_dir); 3201da177e4SLinus Torvalds } 3211da177e4SLinus Torvalds return 0; 3221da177e4SLinus Torvalds 323b71034e5SEvgeniy Dushistov 3241da177e4SLinus Torvalds out_dir: 325b71034e5SEvgeniy Dushistov if (dir_de) { 326b71034e5SEvgeniy Dushistov kunmap(dir_page); 327b71034e5SEvgeniy Dushistov page_cache_release(dir_page); 328b71034e5SEvgeniy Dushistov } 3291da177e4SLinus Torvalds out_old: 330b71034e5SEvgeniy Dushistov kunmap(old_page); 331b71034e5SEvgeniy Dushistov page_cache_release(old_page); 3321da177e4SLinus Torvalds out: 3331da177e4SLinus Torvalds return err; 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 336c5ef1c42SArjan van de Ven const struct inode_operations ufs_dir_inode_operations = { 3371da177e4SLinus Torvalds .create = ufs_create, 3381da177e4SLinus Torvalds .lookup = ufs_lookup, 3391da177e4SLinus Torvalds .link = ufs_link, 3401da177e4SLinus Torvalds .unlink = ufs_unlink, 3411da177e4SLinus Torvalds .symlink = ufs_symlink, 3421da177e4SLinus Torvalds .mkdir = ufs_mkdir, 3431da177e4SLinus Torvalds .rmdir = ufs_rmdir, 3441da177e4SLinus Torvalds .mknod = ufs_mknod, 3451da177e4SLinus Torvalds .rename = ufs_rename, 3461da177e4SLinus Torvalds }; 347