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); 59*642c937bSAl Viro if (ino) 60b55c460dSDavid Howells inode = ufs_iget(dir->i_sb, ino); 61788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 62*642c937bSAl Viro if (IS_ERR(inode)) 63b55c460dSDavid Howells return ERR_CAST(inode); 64*642c937bSAl 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 */ 751da177e4SLinus Torvalds static int ufs_create (struct inode * dir, struct dentry * dentry, int mode, 761da177e4SLinus Torvalds struct nameidata *nd) 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 991da177e4SLinus Torvalds static int ufs_mknod (struct inode * dir, struct dentry *dentry, int 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 131788257d6SArnd Bergmann 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)) 1351da177e4SLinus Torvalds 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); 1601da177e4SLinus Torvalds iput(inode); 1611da177e4SLinus Torvalds goto out; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds static int ufs_link (struct dentry * old_dentry, struct inode * dir, 1651da177e4SLinus Torvalds struct dentry *dentry) 1661da177e4SLinus Torvalds { 1671da177e4SLinus Torvalds struct inode *inode = old_dentry->d_inode; 1681da177e4SLinus Torvalds int error; 1691da177e4SLinus Torvalds 170788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1711da177e4SLinus Torvalds if (inode->i_nlink >= UFS_LINK_MAX) { 172788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 1731da177e4SLinus Torvalds return -EMLINK; 1741da177e4SLinus Torvalds } 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds inode->i_ctime = CURRENT_TIME_SEC; 1773257545eSAlexey Dobriyan inode_inc_link_count(inode); 1787de9c6eeSAl Viro ihold(inode); 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds error = ufs_add_nondir(dentry, inode); 181788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 1821da177e4SLinus Torvalds return error; 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds struct inode * inode; 1881da177e4SLinus Torvalds int err = -EMLINK; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds if (dir->i_nlink >= UFS_LINK_MAX) 1911da177e4SLinus Torvalds goto out; 1921da177e4SLinus Torvalds 193788257d6SArnd Bergmann lock_ufs(dir->i_sb); 1943257545eSAlexey Dobriyan inode_inc_link_count(dir); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds inode = ufs_new_inode(dir, S_IFDIR|mode); 1971da177e4SLinus Torvalds err = PTR_ERR(inode); 1981da177e4SLinus Torvalds if (IS_ERR(inode)) 1991da177e4SLinus Torvalds goto out_dir; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds inode->i_op = &ufs_dir_inode_operations; 2021da177e4SLinus Torvalds inode->i_fop = &ufs_dir_operations; 203826843a3SEvgeniy Dushistov inode->i_mapping->a_ops = &ufs_aops; 2041da177e4SLinus Torvalds 2053257545eSAlexey Dobriyan inode_inc_link_count(inode); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds err = ufs_make_empty(inode, dir); 2081da177e4SLinus Torvalds if (err) 2091da177e4SLinus Torvalds goto out_fail; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds err = ufs_add_link(dentry, inode); 2121da177e4SLinus Torvalds if (err) 2131da177e4SLinus Torvalds goto out_fail; 214788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds d_instantiate(dentry, inode); 2171da177e4SLinus Torvalds out: 2181da177e4SLinus Torvalds return err; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds out_fail: 2213257545eSAlexey Dobriyan inode_dec_link_count(inode); 2223257545eSAlexey Dobriyan inode_dec_link_count(inode); 2231da177e4SLinus Torvalds iput (inode); 2241da177e4SLinus Torvalds out_dir: 2253257545eSAlexey Dobriyan inode_dec_link_count(dir); 226788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2271da177e4SLinus Torvalds goto out; 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds static int ufs_unlink(struct inode *dir, struct dentry *dentry) 2311da177e4SLinus Torvalds { 2321da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 2331da177e4SLinus Torvalds struct ufs_dir_entry *de; 234b71034e5SEvgeniy Dushistov struct page *page; 2351da177e4SLinus Torvalds int err = -ENOENT; 2361da177e4SLinus Torvalds 23708049707SAlexey Dobriyan de = ufs_find_entry(dir, &dentry->d_name, &page); 2381da177e4SLinus Torvalds if (!de) 2391da177e4SLinus Torvalds goto out; 2401da177e4SLinus Torvalds 241b71034e5SEvgeniy Dushistov err = ufs_delete_entry(dir, de, page); 2421da177e4SLinus Torvalds if (err) 2431da177e4SLinus Torvalds goto out; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds inode->i_ctime = dir->i_ctime; 2463257545eSAlexey Dobriyan inode_dec_link_count(inode); 2471da177e4SLinus Torvalds err = 0; 2481da177e4SLinus Torvalds out: 2491da177e4SLinus Torvalds return err; 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds static int ufs_rmdir (struct inode * dir, struct dentry *dentry) 2531da177e4SLinus Torvalds { 2541da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 2551da177e4SLinus Torvalds int err= -ENOTEMPTY; 2561da177e4SLinus Torvalds 257788257d6SArnd Bergmann lock_ufs(dir->i_sb); 2581da177e4SLinus Torvalds if (ufs_empty_dir (inode)) { 2591da177e4SLinus Torvalds err = ufs_unlink(dir, dentry); 2601da177e4SLinus Torvalds if (!err) { 2611da177e4SLinus Torvalds inode->i_size = 0; 2623257545eSAlexey Dobriyan inode_dec_link_count(inode); 2633257545eSAlexey Dobriyan inode_dec_link_count(dir); 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds } 266788257d6SArnd Bergmann unlock_ufs(dir->i_sb); 2671da177e4SLinus Torvalds return err; 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, 2711da177e4SLinus Torvalds struct inode *new_dir, struct dentry *new_dentry) 2721da177e4SLinus Torvalds { 2731da177e4SLinus Torvalds struct inode *old_inode = old_dentry->d_inode; 2741da177e4SLinus Torvalds struct inode *new_inode = new_dentry->d_inode; 275b71034e5SEvgeniy Dushistov struct page *dir_page = NULL; 2761da177e4SLinus Torvalds struct ufs_dir_entry * dir_de = NULL; 277b71034e5SEvgeniy Dushistov struct page *old_page; 2781da177e4SLinus Torvalds struct ufs_dir_entry *old_de; 2791da177e4SLinus Torvalds int err = -ENOENT; 2801da177e4SLinus Torvalds 28108049707SAlexey Dobriyan old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); 2821da177e4SLinus Torvalds if (!old_de) 2831da177e4SLinus Torvalds goto out; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds if (S_ISDIR(old_inode->i_mode)) { 2861da177e4SLinus Torvalds err = -EIO; 287b71034e5SEvgeniy Dushistov dir_de = ufs_dotdot(old_inode, &dir_page); 2881da177e4SLinus Torvalds if (!dir_de) 2891da177e4SLinus Torvalds goto out_old; 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds if (new_inode) { 293b71034e5SEvgeniy Dushistov struct page *new_page; 2941da177e4SLinus Torvalds struct ufs_dir_entry *new_de; 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds err = -ENOTEMPTY; 2971da177e4SLinus Torvalds if (dir_de && !ufs_empty_dir(new_inode)) 2981da177e4SLinus Torvalds goto out_dir; 299b71034e5SEvgeniy Dushistov 3001da177e4SLinus Torvalds err = -ENOENT; 30108049707SAlexey Dobriyan new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); 3021da177e4SLinus Torvalds if (!new_de) 3031da177e4SLinus Torvalds goto out_dir; 304b71034e5SEvgeniy Dushistov ufs_set_link(new_dir, new_de, new_page, old_inode); 3051da177e4SLinus Torvalds new_inode->i_ctime = CURRENT_TIME_SEC; 3061da177e4SLinus Torvalds if (dir_de) 3079a53c3a7SDave Hansen drop_nlink(new_inode); 3083257545eSAlexey Dobriyan inode_dec_link_count(new_inode); 3091da177e4SLinus Torvalds } else { 3101da177e4SLinus Torvalds if (dir_de) { 3111da177e4SLinus Torvalds err = -EMLINK; 3121da177e4SLinus Torvalds if (new_dir->i_nlink >= UFS_LINK_MAX) 3131da177e4SLinus Torvalds goto out_dir; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds err = ufs_add_link(new_dentry, old_inode); 31637750cddSAl Viro if (err) 3171da177e4SLinus Torvalds goto out_dir; 3181da177e4SLinus Torvalds if (dir_de) 3193257545eSAlexey Dobriyan inode_inc_link_count(new_dir); 3201da177e4SLinus Torvalds } 3211da177e4SLinus Torvalds 322b71034e5SEvgeniy Dushistov /* 323b71034e5SEvgeniy Dushistov * Like most other Unix systems, set the ctime for inodes on a 324b71034e5SEvgeniy Dushistov * rename. 325b71034e5SEvgeniy Dushistov */ 326b71034e5SEvgeniy Dushistov old_inode->i_ctime = CURRENT_TIME_SEC; 3271da177e4SLinus Torvalds 328b71034e5SEvgeniy Dushistov ufs_delete_entry(old_dir, old_de, old_page); 32937750cddSAl Viro mark_inode_dirty(old_inode); 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds if (dir_de) { 332b71034e5SEvgeniy Dushistov ufs_set_link(old_inode, dir_de, dir_page, new_dir); 3333257545eSAlexey Dobriyan inode_dec_link_count(old_dir); 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds return 0; 3361da177e4SLinus Torvalds 337b71034e5SEvgeniy Dushistov 3381da177e4SLinus Torvalds out_dir: 339b71034e5SEvgeniy Dushistov if (dir_de) { 340b71034e5SEvgeniy Dushistov kunmap(dir_page); 341b71034e5SEvgeniy Dushistov page_cache_release(dir_page); 342b71034e5SEvgeniy Dushistov } 3431da177e4SLinus Torvalds out_old: 344b71034e5SEvgeniy Dushistov kunmap(old_page); 345b71034e5SEvgeniy Dushistov page_cache_release(old_page); 3461da177e4SLinus Torvalds out: 3471da177e4SLinus Torvalds return err; 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 350c5ef1c42SArjan van de Ven const struct inode_operations ufs_dir_inode_operations = { 3511da177e4SLinus Torvalds .create = ufs_create, 3521da177e4SLinus Torvalds .lookup = ufs_lookup, 3531da177e4SLinus Torvalds .link = ufs_link, 3541da177e4SLinus Torvalds .unlink = ufs_unlink, 3551da177e4SLinus Torvalds .symlink = ufs_symlink, 3561da177e4SLinus Torvalds .mkdir = ufs_mkdir, 3571da177e4SLinus Torvalds .rmdir = ufs_rmdir, 3581da177e4SLinus Torvalds .mknod = ufs_mknod, 3591da177e4SLinus Torvalds .rename = ufs_rename, 3601da177e4SLinus Torvalds }; 361