11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/ufs/ialloc.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (c) 1998 51da177e4SLinus Torvalds * Daniel Pirkl <daniel.pirkl@email.cz> 61da177e4SLinus Torvalds * Charles University, Faculty of Mathematics and Physics 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * from 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * linux/fs/ext2/ialloc.c 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Copyright (C) 1992, 1993, 1994, 1995 131da177e4SLinus Torvalds * Remy Card (card@masi.ibp.fr) 141da177e4SLinus Torvalds * Laboratoire MASI - Institut Blaise Pascal 151da177e4SLinus Torvalds * Universite Pierre et Marie Curie (Paris VI) 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * BSD ufs-inspired inode and directory allocation by 181da177e4SLinus Torvalds * Stephen Tweedie (sct@dcs.ed.ac.uk), 1993 191da177e4SLinus Torvalds * Big-endian to little-endian byte-swapping/bitmaps by 201da177e4SLinus Torvalds * David S. Miller (davem@caip.rutgers.edu), 1995 211da177e4SLinus Torvalds */ 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds #include <linux/fs.h> 241da177e4SLinus Torvalds #include <linux/ufs_fs.h> 251da177e4SLinus Torvalds #include <linux/time.h> 261da177e4SLinus Torvalds #include <linux/stat.h> 271da177e4SLinus Torvalds #include <linux/string.h> 281da177e4SLinus Torvalds #include <linux/quotaops.h> 291da177e4SLinus Torvalds #include <linux/buffer_head.h> 301da177e4SLinus Torvalds #include <linux/sched.h> 311da177e4SLinus Torvalds #include <linux/bitops.h> 321da177e4SLinus Torvalds #include <asm/byteorder.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #include "swab.h" 351da177e4SLinus Torvalds #include "util.h" 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds /* 381da177e4SLinus Torvalds * NOTE! When we get the inode, we're the only people 391da177e4SLinus Torvalds * that have access to it, and as such there are no 401da177e4SLinus Torvalds * race conditions we have to worry about. The inode 411da177e4SLinus Torvalds * is not on the hash-lists, and it cannot be reached 421da177e4SLinus Torvalds * through the filesystem because the directory entry 431da177e4SLinus Torvalds * has been deleted earlier. 441da177e4SLinus Torvalds * 451da177e4SLinus Torvalds * HOWEVER: we must make sure that we get no aliases, 461da177e4SLinus Torvalds * which means that we have to call "clear_inode()" 471da177e4SLinus Torvalds * _before_ we mark the inode not in use in the inode 481da177e4SLinus Torvalds * bitmaps. Otherwise a newly created file might use 491da177e4SLinus Torvalds * the same inode number (not actually the same pointer 501da177e4SLinus Torvalds * though), and then we'd have two inodes sharing the 511da177e4SLinus Torvalds * same inode number and space on the harddisk. 521da177e4SLinus Torvalds */ 531da177e4SLinus Torvalds void ufs_free_inode (struct inode * inode) 541da177e4SLinus Torvalds { 551da177e4SLinus Torvalds struct super_block * sb; 561da177e4SLinus Torvalds struct ufs_sb_private_info * uspi; 571da177e4SLinus Torvalds struct ufs_super_block_first * usb1; 581da177e4SLinus Torvalds struct ufs_cg_private_info * ucpi; 591da177e4SLinus Torvalds struct ufs_cylinder_group * ucg; 601da177e4SLinus Torvalds int is_directory; 611da177e4SLinus Torvalds unsigned ino, cg, bit; 621da177e4SLinus Torvalds 63abf5d15fSEvgeniy Dushistov UFSD("ENTER, ino %lu\n", inode->i_ino); 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds sb = inode->i_sb; 661da177e4SLinus Torvalds uspi = UFS_SB(sb)->s_uspi; 677b4ee73eSEvgeniy usb1 = ubh_get_usb_first(uspi); 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds ino = inode->i_ino; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds lock_super (sb); 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds if (!((ino > 1) && (ino < (uspi->s_ncg * uspi->s_ipg )))) { 741da177e4SLinus Torvalds ufs_warning(sb, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino); 751da177e4SLinus Torvalds unlock_super (sb); 761da177e4SLinus Torvalds return; 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds cg = ufs_inotocg (ino); 801da177e4SLinus Torvalds bit = ufs_inotocgoff (ino); 811da177e4SLinus Torvalds ucpi = ufs_load_cylinder (sb, cg); 821da177e4SLinus Torvalds if (!ucpi) { 831da177e4SLinus Torvalds unlock_super (sb); 841da177e4SLinus Torvalds return; 851da177e4SLinus Torvalds } 869695ef16SEvgeniy Dushistov ucg = ubh_get_ucg(UCPI_UBH(ucpi)); 871da177e4SLinus Torvalds if (!ufs_cg_chkmagic(sb, ucg)) 881da177e4SLinus Torvalds ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number"); 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds ucg->cg_time = cpu_to_fs32(sb, get_seconds()); 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds is_directory = S_ISDIR(inode->i_mode); 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds DQUOT_FREE_INODE(inode); 951da177e4SLinus Torvalds DQUOT_DROP(inode); 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds clear_inode (inode); 981da177e4SLinus Torvalds 999695ef16SEvgeniy Dushistov if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit)) 1001da177e4SLinus Torvalds ufs_error(sb, "ufs_free_inode", "bit already cleared for inode %u", ino); 1011da177e4SLinus Torvalds else { 1029695ef16SEvgeniy Dushistov ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit); 1031da177e4SLinus Torvalds if (ino < ucpi->c_irotor) 1041da177e4SLinus Torvalds ucpi->c_irotor = ino; 1051da177e4SLinus Torvalds fs32_add(sb, &ucg->cg_cs.cs_nifree, 1); 106ee3ffd6cSEvgeniy Dushistov uspi->cs_total.cs_nifree++; 1071da177e4SLinus Torvalds fs32_add(sb, &UFS_SB(sb)->fs_cs(cg).cs_nifree, 1); 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds if (is_directory) { 1101da177e4SLinus Torvalds fs32_sub(sb, &ucg->cg_cs.cs_ndir, 1); 111ee3ffd6cSEvgeniy Dushistov uspi->cs_total.cs_ndir--; 1121da177e4SLinus Torvalds fs32_sub(sb, &UFS_SB(sb)->fs_cs(cg).cs_ndir, 1); 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1169695ef16SEvgeniy Dushistov ubh_mark_buffer_dirty (USPI_UBH(uspi)); 1179695ef16SEvgeniy Dushistov ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); 1181da177e4SLinus Torvalds if (sb->s_flags & MS_SYNCHRONOUS) { 119096125f3SJan Kara ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **) &ucpi); 1209695ef16SEvgeniy Dushistov ubh_wait_on_buffer (UCPI_UBH(ucpi)); 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds sb->s_dirt = 1; 1241da177e4SLinus Torvalds unlock_super (sb); 125abf5d15fSEvgeniy Dushistov UFSD("EXIT\n"); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* 1291da177e4SLinus Torvalds * There are two policies for allocating an inode. If the new inode is 1301da177e4SLinus Torvalds * a directory, then a forward search is made for a block group with both 1311da177e4SLinus Torvalds * free space and a low directory-to-inode ratio; if that fails, then of 1321da177e4SLinus Torvalds * the groups with above-average free space, that group with the fewest 1331da177e4SLinus Torvalds * directories already is chosen. 1341da177e4SLinus Torvalds * 1351da177e4SLinus Torvalds * For other inodes, search forward from the parent directory's block 1361da177e4SLinus Torvalds * group to find a free inode. 1371da177e4SLinus Torvalds */ 1381da177e4SLinus Torvalds struct inode * ufs_new_inode(struct inode * dir, int mode) 1391da177e4SLinus Torvalds { 1401da177e4SLinus Torvalds struct super_block * sb; 1411da177e4SLinus Torvalds struct ufs_sb_info * sbi; 1421da177e4SLinus Torvalds struct ufs_sb_private_info * uspi; 1431da177e4SLinus Torvalds struct ufs_super_block_first * usb1; 1441da177e4SLinus Torvalds struct ufs_cg_private_info * ucpi; 1451da177e4SLinus Torvalds struct ufs_cylinder_group * ucg; 1461da177e4SLinus Torvalds struct inode * inode; 1471da177e4SLinus Torvalds unsigned cg, bit, i, j, start; 1481da177e4SLinus Torvalds struct ufs_inode_info *ufsi; 1491da177e4SLinus Torvalds 150abf5d15fSEvgeniy Dushistov UFSD("ENTER\n"); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds /* Cannot create files in a deleted directory */ 1531da177e4SLinus Torvalds if (!dir || !dir->i_nlink) 1541da177e4SLinus Torvalds return ERR_PTR(-EPERM); 1551da177e4SLinus Torvalds sb = dir->i_sb; 1561da177e4SLinus Torvalds inode = new_inode(sb); 1571da177e4SLinus Torvalds if (!inode) 1581da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1591da177e4SLinus Torvalds ufsi = UFS_I(inode); 1601da177e4SLinus Torvalds sbi = UFS_SB(sb); 1611da177e4SLinus Torvalds uspi = sbi->s_uspi; 1627b4ee73eSEvgeniy usb1 = ubh_get_usb_first(uspi); 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds lock_super (sb); 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds /* 1671da177e4SLinus Torvalds * Try to place the inode in its parent directory 1681da177e4SLinus Torvalds */ 1691da177e4SLinus Torvalds i = ufs_inotocg(dir->i_ino); 1701da177e4SLinus Torvalds if (sbi->fs_cs(i).cs_nifree) { 1711da177e4SLinus Torvalds cg = i; 1721da177e4SLinus Torvalds goto cg_found; 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* 1761da177e4SLinus Torvalds * Use a quadratic hash to find a group with a free inode 1771da177e4SLinus Torvalds */ 1781da177e4SLinus Torvalds for ( j = 1; j < uspi->s_ncg; j <<= 1 ) { 1791da177e4SLinus Torvalds i += j; 1801da177e4SLinus Torvalds if (i >= uspi->s_ncg) 1811da177e4SLinus Torvalds i -= uspi->s_ncg; 1821da177e4SLinus Torvalds if (sbi->fs_cs(i).cs_nifree) { 1831da177e4SLinus Torvalds cg = i; 1841da177e4SLinus Torvalds goto cg_found; 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* 1891da177e4SLinus Torvalds * That failed: try linear search for a free inode 1901da177e4SLinus Torvalds */ 1911da177e4SLinus Torvalds i = ufs_inotocg(dir->i_ino) + 1; 1921da177e4SLinus Torvalds for (j = 2; j < uspi->s_ncg; j++) { 1931da177e4SLinus Torvalds i++; 1941da177e4SLinus Torvalds if (i >= uspi->s_ncg) 1951da177e4SLinus Torvalds i = 0; 1961da177e4SLinus Torvalds if (sbi->fs_cs(i).cs_nifree) { 1971da177e4SLinus Torvalds cg = i; 1981da177e4SLinus Torvalds goto cg_found; 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds goto failed; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds cg_found: 2051da177e4SLinus Torvalds ucpi = ufs_load_cylinder (sb, cg); 2061da177e4SLinus Torvalds if (!ucpi) 2071da177e4SLinus Torvalds goto failed; 2089695ef16SEvgeniy Dushistov ucg = ubh_get_ucg(UCPI_UBH(ucpi)); 2091da177e4SLinus Torvalds if (!ufs_cg_chkmagic(sb, ucg)) 2101da177e4SLinus Torvalds ufs_panic (sb, "ufs_new_inode", "internal error, bad cg magic number"); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds start = ucpi->c_irotor; 2139695ef16SEvgeniy Dushistov bit = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, uspi->s_ipg, start); 2141da177e4SLinus Torvalds if (!(bit < uspi->s_ipg)) { 2159695ef16SEvgeniy Dushistov bit = ubh_find_first_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, start); 2161da177e4SLinus Torvalds if (!(bit < start)) { 2171da177e4SLinus Torvalds ufs_error (sb, "ufs_new_inode", 2181da177e4SLinus Torvalds "cylinder group %u corrupted - error in inode bitmap\n", cg); 2191da177e4SLinus Torvalds goto failed; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds } 222abf5d15fSEvgeniy Dushistov UFSD("start = %u, bit = %u, ipg = %u\n", start, bit, uspi->s_ipg); 2239695ef16SEvgeniy Dushistov if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit)) 2249695ef16SEvgeniy Dushistov ubh_setbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit); 2251da177e4SLinus Torvalds else { 2261da177e4SLinus Torvalds ufs_panic (sb, "ufs_new_inode", "internal error"); 2271da177e4SLinus Torvalds goto failed; 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds fs32_sub(sb, &ucg->cg_cs.cs_nifree, 1); 231ee3ffd6cSEvgeniy Dushistov uspi->cs_total.cs_nifree--; 2321da177e4SLinus Torvalds fs32_sub(sb, &sbi->fs_cs(cg).cs_nifree, 1); 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds if (S_ISDIR(mode)) { 2351da177e4SLinus Torvalds fs32_add(sb, &ucg->cg_cs.cs_ndir, 1); 236ee3ffd6cSEvgeniy Dushistov uspi->cs_total.cs_ndir++; 2371da177e4SLinus Torvalds fs32_add(sb, &sbi->fs_cs(cg).cs_ndir, 1); 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 2409695ef16SEvgeniy Dushistov ubh_mark_buffer_dirty (USPI_UBH(uspi)); 2419695ef16SEvgeniy Dushistov ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); 2421da177e4SLinus Torvalds if (sb->s_flags & MS_SYNCHRONOUS) { 243096125f3SJan Kara ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **) &ucpi); 2449695ef16SEvgeniy Dushistov ubh_wait_on_buffer (UCPI_UBH(ucpi)); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds sb->s_dirt = 1; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds inode->i_mode = mode; 2491da177e4SLinus Torvalds inode->i_uid = current->fsuid; 2501da177e4SLinus Torvalds if (dir->i_mode & S_ISGID) { 2511da177e4SLinus Torvalds inode->i_gid = dir->i_gid; 2521da177e4SLinus Torvalds if (S_ISDIR(mode)) 2531da177e4SLinus Torvalds inode->i_mode |= S_ISGID; 2541da177e4SLinus Torvalds } else 2551da177e4SLinus Torvalds inode->i_gid = current->fsgid; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds inode->i_ino = cg * uspi->s_ipg + bit; 2581da177e4SLinus Torvalds inode->i_blksize = PAGE_SIZE; /* This is the optimal IO size (for stat), not the fs block size */ 2591da177e4SLinus Torvalds inode->i_blocks = 0; 2601da177e4SLinus Torvalds inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 2611da177e4SLinus Torvalds ufsi->i_flags = UFS_I(dir)->i_flags; 2621da177e4SLinus Torvalds ufsi->i_lastfrag = 0; 2631da177e4SLinus Torvalds ufsi->i_gen = 0; 2641da177e4SLinus Torvalds ufsi->i_shadow = 0; 2651da177e4SLinus Torvalds ufsi->i_osync = 0; 2661da177e4SLinus Torvalds ufsi->i_oeftflag = 0; 267dd187a26SEvgeniy Dushistov ufsi->i_dir_start_lookup = 0; 2681da177e4SLinus Torvalds memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1)); 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds insert_inode_hash(inode); 2711da177e4SLinus Torvalds mark_inode_dirty(inode); 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds unlock_super (sb); 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds if (DQUOT_ALLOC_INODE(inode)) { 2761da177e4SLinus Torvalds DQUOT_DROP(inode); 2771da177e4SLinus Torvalds inode->i_flags |= S_NOQUOTA; 2781da177e4SLinus Torvalds inode->i_nlink = 0; 2791da177e4SLinus Torvalds iput(inode); 2801da177e4SLinus Torvalds return ERR_PTR(-EDQUOT); 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 283abf5d15fSEvgeniy Dushistov UFSD("allocating inode %lu\n", inode->i_ino); 284abf5d15fSEvgeniy Dushistov UFSD("EXIT\n"); 2851da177e4SLinus Torvalds return inode; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds failed: 2881da177e4SLinus Torvalds unlock_super (sb); 2891da177e4SLinus Torvalds make_bad_inode(inode); 2901da177e4SLinus Torvalds iput (inode); 291abf5d15fSEvgeniy Dushistov UFSD("EXIT (FAILED)\n"); 2921da177e4SLinus Torvalds return ERR_PTR(-ENOSPC); 2931da177e4SLinus Torvalds } 294