1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/fs/ufs/namei.c 41da177e4SLinus Torvalds * 5b71034e5SEvgeniy Dushistov * Migration to usage of "page cache" on May 2006 by 6b71034e5SEvgeniy Dushistov * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base. 7b71034e5SEvgeniy Dushistov * 81da177e4SLinus Torvalds * Copyright (C) 1998 91da177e4SLinus Torvalds * Daniel Pirkl <daniel.pirkl@email.cz> 101da177e4SLinus Torvalds * Charles University, Faculty of Mathematics and Physics 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * from 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * linux/fs/ext2/namei.c 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * Copyright (C) 1992, 1993, 1994, 1995 171da177e4SLinus Torvalds * Remy Card (card@masi.ibp.fr) 181da177e4SLinus Torvalds * Laboratoire MASI - Institut Blaise Pascal 191da177e4SLinus Torvalds * Universite Pierre et Marie Curie (Paris VI) 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * from 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * linux/fs/minix/namei.c 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * Copyright (C) 1991, 1992 Linus Torvalds 261da177e4SLinus Torvalds * 271da177e4SLinus Torvalds * Big-endian to little-endian byte-swapping/bitmaps by 281da177e4SLinus Torvalds * David S. Miller (davem@caip.rutgers.edu), 1995 291da177e4SLinus Torvalds */ 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <linux/time.h> 321da177e4SLinus Torvalds #include <linux/fs.h> 33e5420598SMike Frysinger 34e5420598SMike Frysinger #include "ufs_fs.h" 35bcd6d4ecSChristoph Hellwig #include "ufs.h" 361da177e4SLinus Torvalds #include "util.h" 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) 391da177e4SLinus Torvalds { 401da177e4SLinus Torvalds int err = ufs_add_link(dentry, inode); 411da177e4SLinus Torvalds if (!err) { 421e2e547aSAl Viro d_instantiate_new(dentry, inode); 431da177e4SLinus Torvalds return 0; 441da177e4SLinus Torvalds } 453257545eSAlexey Dobriyan inode_dec_link_count(inode); 46*dd549927SAl Viro discard_new_inode(inode); 471da177e4SLinus Torvalds return err; 481da177e4SLinus Torvalds } 491da177e4SLinus Torvalds 5000cd8dd3SAl Viro static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) 511da177e4SLinus Torvalds { 521da177e4SLinus Torvalds struct inode * inode = NULL; 531da177e4SLinus Torvalds ino_t ino; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds if (dentry->d_name.len > UFS_MAXNAMLEN) 561da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 571da177e4SLinus Torvalds 5808049707SAlexey Dobriyan ino = ufs_inode_by_name(dir, &dentry->d_name); 59642c937bSAl Viro if (ino) 60b55c460dSDavid Howells inode = ufs_iget(dir->i_sb, ino); 61642c937bSAl Viro return d_splice_alias(inode, dentry); 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds /* 651da177e4SLinus Torvalds * By the time this is called, we already have created 661da177e4SLinus Torvalds * the directory cache entry for the new file, but it 671da177e4SLinus Torvalds * is so far negative - it has no inode. 681da177e4SLinus Torvalds * 691da177e4SLinus Torvalds * If the create succeeds, we fill in the inode information 701da177e4SLinus Torvalds * with d_instantiate(). 711da177e4SLinus Torvalds */ 724acdaf27SAl Viro static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode, 73ebfc3b49SAl Viro bool excl) 741da177e4SLinus Torvalds { 75abf5d15fSEvgeniy Dushistov struct inode *inode; 76907f4554SChristoph Hellwig 77abf5d15fSEvgeniy Dushistov inode = ufs_new_inode(dir, mode); 78a50e4a02SAl Viro if (IS_ERR(inode)) 79a50e4a02SAl Viro return PTR_ERR(inode); 80abf5d15fSEvgeniy Dushistov 811da177e4SLinus Torvalds inode->i_op = &ufs_file_inode_operations; 821da177e4SLinus Torvalds inode->i_fop = &ufs_file_operations; 831da177e4SLinus Torvalds inode->i_mapping->a_ops = &ufs_aops; 841da177e4SLinus Torvalds mark_inode_dirty(inode); 85a50e4a02SAl Viro return ufs_add_nondir(dentry, inode); 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881a67aafbSAl Viro static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 891da177e4SLinus Torvalds { 901da177e4SLinus Torvalds struct inode *inode; 911da177e4SLinus Torvalds int err; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds if (!old_valid_dev(rdev)) 941da177e4SLinus Torvalds return -EINVAL; 95907f4554SChristoph Hellwig 961da177e4SLinus Torvalds inode = ufs_new_inode(dir, mode); 971da177e4SLinus Torvalds err = PTR_ERR(inode); 981da177e4SLinus Torvalds if (!IS_ERR(inode)) { 991da177e4SLinus Torvalds init_special_inode(inode, mode, rdev); 1001da177e4SLinus Torvalds ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); 1011da177e4SLinus Torvalds mark_inode_dirty(inode); 1021da177e4SLinus Torvalds err = ufs_add_nondir(dentry, inode); 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds return err; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds static int ufs_symlink (struct inode * dir, struct dentry * dentry, 1081da177e4SLinus Torvalds const char * symname) 1091da177e4SLinus Torvalds { 1101da177e4SLinus Torvalds struct super_block * sb = dir->i_sb; 111a50e4a02SAl Viro int err; 1121da177e4SLinus Torvalds unsigned l = strlen(symname)+1; 1131da177e4SLinus Torvalds struct inode * inode; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds if (l > sb->s_blocksize) 116a50e4a02SAl Viro return -ENAMETOOLONG; 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); 1191da177e4SLinus Torvalds err = PTR_ERR(inode); 1201da177e4SLinus Torvalds if (IS_ERR(inode)) 121a50e4a02SAl Viro return err; 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { 1241da177e4SLinus Torvalds /* slow symlink */ 1259cdce3c0SAl Viro inode->i_op = &page_symlink_inode_operations; 12621fc61c7SAl Viro inode_nohighmem(inode); 1271da177e4SLinus Torvalds inode->i_mapping->a_ops = &ufs_aops; 1281da177e4SLinus Torvalds err = page_symlink(inode, symname, l); 1291da177e4SLinus Torvalds if (err) 1301da177e4SLinus Torvalds goto out_fail; 1311da177e4SLinus Torvalds } else { 1321da177e4SLinus Torvalds /* fast symlink */ 1339cdce3c0SAl Viro inode->i_op = &simple_symlink_inode_operations; 1344b8061a6SAl Viro inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink; 1354b8061a6SAl Viro memcpy(inode->i_link, symname, l); 1361da177e4SLinus Torvalds inode->i_size = l-1; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds mark_inode_dirty(inode); 1391da177e4SLinus Torvalds 140a50e4a02SAl Viro return ufs_add_nondir(dentry, inode); 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds out_fail: 1433257545eSAlexey Dobriyan inode_dec_link_count(inode); 144*dd549927SAl Viro discard_new_inode(inode); 145a50e4a02SAl Viro return err; 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds static int ufs_link (struct dentry * old_dentry, struct inode * dir, 1491da177e4SLinus Torvalds struct dentry *dentry) 1501da177e4SLinus Torvalds { 1512b0143b5SDavid Howells struct inode *inode = d_inode(old_dentry); 1521da177e4SLinus Torvalds int error; 1531da177e4SLinus Torvalds 15402027d42SDeepa Dinamani inode->i_ctime = current_time(inode); 1553257545eSAlexey Dobriyan inode_inc_link_count(inode); 1567de9c6eeSAl Viro ihold(inode); 1571da177e4SLinus Torvalds 15812ecbb4bSJan Kara error = ufs_add_link(dentry, inode); 15912ecbb4bSJan Kara if (error) { 16012ecbb4bSJan Kara inode_dec_link_count(inode); 16112ecbb4bSJan Kara iput(inode); 16212ecbb4bSJan Kara } else 16312ecbb4bSJan Kara d_instantiate(dentry, inode); 1641da177e4SLinus Torvalds return error; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 16718bb1db3SAl Viro static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds struct inode * inode; 1708de52778SAl Viro int err; 1711da177e4SLinus Torvalds 17213b987eaSFabian Frederick inode_inc_link_count(dir); 17313b987eaSFabian Frederick 1741da177e4SLinus Torvalds inode = ufs_new_inode(dir, S_IFDIR|mode); 17513b987eaSFabian Frederick err = PTR_ERR(inode); 1761da177e4SLinus Torvalds if (IS_ERR(inode)) 17713b987eaSFabian Frederick goto out_dir; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds inode->i_op = &ufs_dir_inode_operations; 1801da177e4SLinus Torvalds inode->i_fop = &ufs_dir_operations; 181826843a3SEvgeniy Dushistov inode->i_mapping->a_ops = &ufs_aops; 1821da177e4SLinus Torvalds 1833257545eSAlexey Dobriyan inode_inc_link_count(inode); 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds err = ufs_make_empty(inode, dir); 1861da177e4SLinus Torvalds if (err) 1871da177e4SLinus Torvalds goto out_fail; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds err = ufs_add_link(dentry, inode); 1901da177e4SLinus Torvalds if (err) 1911da177e4SLinus Torvalds goto out_fail; 1921da177e4SLinus Torvalds 1931e2e547aSAl Viro d_instantiate_new(dentry, inode); 194a50e4a02SAl Viro return 0; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds out_fail: 1973257545eSAlexey Dobriyan inode_dec_link_count(inode); 1983257545eSAlexey Dobriyan inode_dec_link_count(inode); 199*dd549927SAl Viro discard_new_inode(inode); 20013b987eaSFabian Frederick out_dir: 2013257545eSAlexey Dobriyan inode_dec_link_count(dir); 202a50e4a02SAl Viro return err; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds static int ufs_unlink(struct inode *dir, struct dentry *dentry) 2061da177e4SLinus Torvalds { 2072b0143b5SDavid Howells struct inode * inode = d_inode(dentry); 2081da177e4SLinus Torvalds struct ufs_dir_entry *de; 209b71034e5SEvgeniy Dushistov struct page *page; 2101da177e4SLinus Torvalds int err = -ENOENT; 2111da177e4SLinus Torvalds 21208049707SAlexey Dobriyan de = ufs_find_entry(dir, &dentry->d_name, &page); 2131da177e4SLinus Torvalds if (!de) 2141da177e4SLinus Torvalds goto out; 2151da177e4SLinus Torvalds 216b71034e5SEvgeniy Dushistov err = ufs_delete_entry(dir, de, page); 2171da177e4SLinus Torvalds if (err) 2181da177e4SLinus Torvalds goto out; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds inode->i_ctime = dir->i_ctime; 2213257545eSAlexey Dobriyan inode_dec_link_count(inode); 2221da177e4SLinus Torvalds err = 0; 2231da177e4SLinus Torvalds out: 2241da177e4SLinus Torvalds return err; 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds static int ufs_rmdir (struct inode * dir, struct dentry *dentry) 2281da177e4SLinus Torvalds { 2292b0143b5SDavid Howells struct inode * inode = d_inode(dentry); 2301da177e4SLinus Torvalds int err= -ENOTEMPTY; 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds if (ufs_empty_dir (inode)) { 2331da177e4SLinus Torvalds err = ufs_unlink(dir, dentry); 2341da177e4SLinus Torvalds if (!err) { 2351da177e4SLinus Torvalds inode->i_size = 0; 2363257545eSAlexey Dobriyan inode_dec_link_count(inode); 2373257545eSAlexey Dobriyan inode_dec_link_count(dir); 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds return err; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, 244f03b8ad8SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 245f03b8ad8SMiklos Szeredi unsigned int flags) 2461da177e4SLinus Torvalds { 2472b0143b5SDavid Howells struct inode *old_inode = d_inode(old_dentry); 2482b0143b5SDavid Howells struct inode *new_inode = d_inode(new_dentry); 249b71034e5SEvgeniy Dushistov struct page *dir_page = NULL; 2501da177e4SLinus Torvalds struct ufs_dir_entry * dir_de = NULL; 251b71034e5SEvgeniy Dushistov struct page *old_page; 2521da177e4SLinus Torvalds struct ufs_dir_entry *old_de; 2531da177e4SLinus Torvalds int err = -ENOENT; 2541da177e4SLinus Torvalds 255f03b8ad8SMiklos Szeredi if (flags & ~RENAME_NOREPLACE) 256f03b8ad8SMiklos Szeredi return -EINVAL; 257f03b8ad8SMiklos Szeredi 25808049707SAlexey Dobriyan old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); 2591da177e4SLinus Torvalds if (!old_de) 2601da177e4SLinus Torvalds goto out; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds if (S_ISDIR(old_inode->i_mode)) { 2631da177e4SLinus Torvalds err = -EIO; 264b71034e5SEvgeniy Dushistov dir_de = ufs_dotdot(old_inode, &dir_page); 2651da177e4SLinus Torvalds if (!dir_de) 2661da177e4SLinus Torvalds goto out_old; 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds if (new_inode) { 270b71034e5SEvgeniy Dushistov struct page *new_page; 2711da177e4SLinus Torvalds struct ufs_dir_entry *new_de; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds err = -ENOTEMPTY; 2741da177e4SLinus Torvalds if (dir_de && !ufs_empty_dir(new_inode)) 2751da177e4SLinus Torvalds goto out_dir; 276b71034e5SEvgeniy Dushistov 2771da177e4SLinus Torvalds err = -ENOENT; 27808049707SAlexey Dobriyan new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); 2791da177e4SLinus Torvalds if (!new_de) 2801da177e4SLinus Torvalds goto out_dir; 28170d45cdbSAl Viro ufs_set_link(new_dir, new_de, new_page, old_inode, 1); 28202027d42SDeepa Dinamani new_inode->i_ctime = current_time(new_inode); 2831da177e4SLinus Torvalds if (dir_de) 2849a53c3a7SDave Hansen drop_nlink(new_inode); 2853257545eSAlexey Dobriyan inode_dec_link_count(new_inode); 2861da177e4SLinus Torvalds } else { 2871da177e4SLinus Torvalds err = ufs_add_link(new_dentry, old_inode); 28837750cddSAl Viro if (err) 2891da177e4SLinus Torvalds goto out_dir; 2901da177e4SLinus Torvalds if (dir_de) 2913257545eSAlexey Dobriyan inode_inc_link_count(new_dir); 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 294b71034e5SEvgeniy Dushistov /* 295b71034e5SEvgeniy Dushistov * Like most other Unix systems, set the ctime for inodes on a 296b71034e5SEvgeniy Dushistov * rename. 297b71034e5SEvgeniy Dushistov */ 29802027d42SDeepa Dinamani old_inode->i_ctime = current_time(old_inode); 2991da177e4SLinus Torvalds 300b71034e5SEvgeniy Dushistov ufs_delete_entry(old_dir, old_de, old_page); 30137750cddSAl Viro mark_inode_dirty(old_inode); 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds if (dir_de) { 30470d45cdbSAl Viro if (old_dir != new_dir) 30570d45cdbSAl Viro ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0); 30670d45cdbSAl Viro else { 30770d45cdbSAl Viro kunmap(dir_page); 30809cbfeafSKirill A. Shutemov put_page(dir_page); 30970d45cdbSAl Viro } 3103257545eSAlexey Dobriyan inode_dec_link_count(old_dir); 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds return 0; 3131da177e4SLinus Torvalds 314b71034e5SEvgeniy Dushistov 3151da177e4SLinus Torvalds out_dir: 316b71034e5SEvgeniy Dushistov if (dir_de) { 317b71034e5SEvgeniy Dushistov kunmap(dir_page); 31809cbfeafSKirill A. Shutemov put_page(dir_page); 319b71034e5SEvgeniy Dushistov } 3201da177e4SLinus Torvalds out_old: 321b71034e5SEvgeniy Dushistov kunmap(old_page); 32209cbfeafSKirill A. Shutemov put_page(old_page); 3231da177e4SLinus Torvalds out: 3241da177e4SLinus Torvalds return err; 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds 327c5ef1c42SArjan van de Ven const struct inode_operations ufs_dir_inode_operations = { 3281da177e4SLinus Torvalds .create = ufs_create, 3291da177e4SLinus Torvalds .lookup = ufs_lookup, 3301da177e4SLinus Torvalds .link = ufs_link, 3311da177e4SLinus Torvalds .unlink = ufs_unlink, 3321da177e4SLinus Torvalds .symlink = ufs_symlink, 3331da177e4SLinus Torvalds .mkdir = ufs_mkdir, 3341da177e4SLinus Torvalds .rmdir = ufs_rmdir, 3351da177e4SLinus Torvalds .mknod = ufs_mknod, 3361da177e4SLinus Torvalds .rename = ufs_rename, 3371da177e4SLinus Torvalds }; 338