11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/ufs/util.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 91da177e4SLinus Torvalds #include <linux/string.h> 101da177e4SLinus Torvalds #include <linux/slab.h> 111da177e4SLinus Torvalds #include <linux/buffer_head.h> 121da177e4SLinus Torvalds 13e5420598SMike Frysinger #include "ufs_fs.h" 14bcd6d4ecSChristoph Hellwig #include "ufs.h" 151da177e4SLinus Torvalds #include "swab.h" 161da177e4SLinus Torvalds #include "util.h" 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi, 191da177e4SLinus Torvalds struct super_block *sb, u64 fragment, u64 size) 201da177e4SLinus Torvalds { 211da177e4SLinus Torvalds struct ufs_buffer_head * ubh; 221da177e4SLinus Torvalds unsigned i, j ; 231da177e4SLinus Torvalds u64 count = 0; 241da177e4SLinus Torvalds if (size & ~uspi->s_fmask) 251da177e4SLinus Torvalds return NULL; 261da177e4SLinus Torvalds count = size >> uspi->s_fshift; 271da177e4SLinus Torvalds if (count > UFS_MAXFRAG) 281da177e4SLinus Torvalds return NULL; 29194c8767SZhang Yanfei ubh = kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS); 301da177e4SLinus Torvalds if (!ubh) 311da177e4SLinus Torvalds return NULL; 321da177e4SLinus Torvalds ubh->fragment = fragment; 331da177e4SLinus Torvalds ubh->count = count; 341da177e4SLinus Torvalds for (i = 0; i < count; i++) 351da177e4SLinus Torvalds if (!(ubh->bh[i] = sb_bread(sb, fragment + i))) 361da177e4SLinus Torvalds goto failed; 371da177e4SLinus Torvalds for (; i < UFS_MAXFRAG; i++) 381da177e4SLinus Torvalds ubh->bh[i] = NULL; 391da177e4SLinus Torvalds return ubh; 401da177e4SLinus Torvalds failed: 411da177e4SLinus Torvalds for (j = 0; j < i; j++) 421da177e4SLinus Torvalds brelse (ubh->bh[j]); 431da177e4SLinus Torvalds kfree(ubh); 441da177e4SLinus Torvalds return NULL; 451da177e4SLinus Torvalds } 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi, 481da177e4SLinus Torvalds struct super_block *sb, u64 fragment, u64 size) 491da177e4SLinus Torvalds { 501da177e4SLinus Torvalds unsigned i, j; 511da177e4SLinus Torvalds u64 count = 0; 521da177e4SLinus Torvalds if (size & ~uspi->s_fmask) 531da177e4SLinus Torvalds return NULL; 541da177e4SLinus Torvalds count = size >> uspi->s_fshift; 551da177e4SLinus Torvalds if (count <= 0 || count > UFS_MAXFRAG) 561da177e4SLinus Torvalds return NULL; 579695ef16SEvgeniy Dushistov USPI_UBH(uspi)->fragment = fragment; 589695ef16SEvgeniy Dushistov USPI_UBH(uspi)->count = count; 591da177e4SLinus Torvalds for (i = 0; i < count; i++) 609695ef16SEvgeniy Dushistov if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i))) 611da177e4SLinus Torvalds goto failed; 621da177e4SLinus Torvalds for (; i < UFS_MAXFRAG; i++) 639695ef16SEvgeniy Dushistov USPI_UBH(uspi)->bh[i] = NULL; 649695ef16SEvgeniy Dushistov return USPI_UBH(uspi); 651da177e4SLinus Torvalds failed: 661da177e4SLinus Torvalds for (j = 0; j < i; j++) 679695ef16SEvgeniy Dushistov brelse (USPI_UBH(uspi)->bh[j]); 681da177e4SLinus Torvalds return NULL; 691da177e4SLinus Torvalds } 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds void ubh_brelse (struct ufs_buffer_head * ubh) 721da177e4SLinus Torvalds { 731da177e4SLinus Torvalds unsigned i; 741da177e4SLinus Torvalds if (!ubh) 751da177e4SLinus Torvalds return; 761da177e4SLinus Torvalds for (i = 0; i < ubh->count; i++) 771da177e4SLinus Torvalds brelse (ubh->bh[i]); 781da177e4SLinus Torvalds kfree (ubh); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds void ubh_brelse_uspi (struct ufs_sb_private_info * uspi) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds unsigned i; 849695ef16SEvgeniy Dushistov if (!USPI_UBH(uspi)) 851da177e4SLinus Torvalds return; 869695ef16SEvgeniy Dushistov for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) { 879695ef16SEvgeniy Dushistov brelse (USPI_UBH(uspi)->bh[i]); 889695ef16SEvgeniy Dushistov USPI_UBH(uspi)->bh[i] = NULL; 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds } 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh) 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds unsigned i; 951da177e4SLinus Torvalds if (!ubh) 961da177e4SLinus Torvalds return; 971da177e4SLinus Torvalds for ( i = 0; i < ubh->count; i++ ) 981da177e4SLinus Torvalds mark_buffer_dirty (ubh->bh[i]); 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag) 1021da177e4SLinus Torvalds { 1031da177e4SLinus Torvalds unsigned i; 1041da177e4SLinus Torvalds if (!ubh) 1051da177e4SLinus Torvalds return; 1061da177e4SLinus Torvalds if (flag) { 1071da177e4SLinus Torvalds for ( i = 0; i < ubh->count; i++ ) 1081da177e4SLinus Torvalds set_buffer_uptodate (ubh->bh[i]); 1091da177e4SLinus Torvalds } else { 1101da177e4SLinus Torvalds for ( i = 0; i < ubh->count; i++ ) 1111da177e4SLinus Torvalds clear_buffer_uptodate (ubh->bh[i]); 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds 1159cb569d6SChristoph Hellwig void ubh_sync_block(struct ufs_buffer_head *ubh) 1161da177e4SLinus Torvalds { 1179cb569d6SChristoph Hellwig if (ubh) { 1181da177e4SLinus Torvalds unsigned i; 1199cb569d6SChristoph Hellwig 1209cb569d6SChristoph Hellwig for (i = 0; i < ubh->count; i++) 1212a222ca9SMike Christie write_dirty_buffer(ubh->bh[i], 0); 1229cb569d6SChristoph Hellwig 1231da177e4SLinus Torvalds for (i = 0; i < ubh->count; i++) 1241da177e4SLinus Torvalds wait_on_buffer(ubh->bh[i]); 1251da177e4SLinus Torvalds } 1269cb569d6SChristoph Hellwig } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds void ubh_bforget (struct ufs_buffer_head * ubh) 1291da177e4SLinus Torvalds { 1301da177e4SLinus Torvalds unsigned i; 1311da177e4SLinus Torvalds if (!ubh) 1321da177e4SLinus Torvalds return; 1331da177e4SLinus Torvalds for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) 1341da177e4SLinus Torvalds bforget (ubh->bh[i]); 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds int ubh_buffer_dirty (struct ufs_buffer_head * ubh) 1381da177e4SLinus Torvalds { 1391da177e4SLinus Torvalds unsigned i; 1401da177e4SLinus Torvalds unsigned result = 0; 1411da177e4SLinus Torvalds if (!ubh) 1421da177e4SLinus Torvalds return 0; 1431da177e4SLinus Torvalds for ( i = 0; i < ubh->count; i++ ) 1441da177e4SLinus Torvalds result |= buffer_dirty(ubh->bh[i]); 1451da177e4SLinus Torvalds return result; 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, 1491da177e4SLinus Torvalds unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size) 1501da177e4SLinus Torvalds { 1511da177e4SLinus Torvalds unsigned len, bhno; 1521da177e4SLinus Torvalds if (size > (ubh->count << uspi->s_fshift)) 1531da177e4SLinus Torvalds size = ubh->count << uspi->s_fshift; 1541da177e4SLinus Torvalds bhno = 0; 1551da177e4SLinus Torvalds while (size) { 1561da177e4SLinus Torvalds len = min_t(unsigned int, size, uspi->s_fsize); 1571da177e4SLinus Torvalds memcpy (mem, ubh->bh[bhno]->b_data, len); 1581da177e4SLinus Torvalds mem += uspi->s_fsize; 1591da177e4SLinus Torvalds size -= len; 1601da177e4SLinus Torvalds bhno++; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, 1651da177e4SLinus Torvalds struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size) 1661da177e4SLinus Torvalds { 1671da177e4SLinus Torvalds unsigned len, bhno; 1681da177e4SLinus Torvalds if (size > (ubh->count << uspi->s_fshift)) 1691da177e4SLinus Torvalds size = ubh->count << uspi->s_fshift; 1701da177e4SLinus Torvalds bhno = 0; 1711da177e4SLinus Torvalds while (size) { 1721da177e4SLinus Torvalds len = min_t(unsigned int, size, uspi->s_fsize); 1731da177e4SLinus Torvalds memcpy (ubh->bh[bhno]->b_data, mem, len); 1741da177e4SLinus Torvalds mem += uspi->s_fsize; 1751da177e4SLinus Torvalds size -= len; 1761da177e4SLinus Torvalds bhno++; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds dev_t 1811da177e4SLinus Torvalds ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi) 1821da177e4SLinus Torvalds { 18344aa5359SAl Viro __u32 fs32; 1841da177e4SLinus Torvalds dev_t dev; 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) 18744aa5359SAl Viro fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]); 1881da177e4SLinus Torvalds else 18944aa5359SAl Viro fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]); 1901da177e4SLinus Torvalds switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { 1911da177e4SLinus Torvalds case UFS_ST_SUNx86: 1921da177e4SLinus Torvalds case UFS_ST_SUN: 1931da177e4SLinus Torvalds if ((fs32 & 0xffff0000) == 0 || 1941da177e4SLinus Torvalds (fs32 & 0xffff0000) == 0xffff0000) 1951da177e4SLinus Torvalds dev = old_decode_dev(fs32 & 0x7fff); 1961da177e4SLinus Torvalds else 1971da177e4SLinus Torvalds dev = MKDEV(sysv_major(fs32), sysv_minor(fs32)); 1981da177e4SLinus Torvalds break; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds default: 2011da177e4SLinus Torvalds dev = old_decode_dev(fs32); 2021da177e4SLinus Torvalds break; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds return dev; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds void 2081da177e4SLinus Torvalds ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev) 2091da177e4SLinus Torvalds { 21044aa5359SAl Viro __u32 fs32; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { 2131da177e4SLinus Torvalds case UFS_ST_SUNx86: 2141da177e4SLinus Torvalds case UFS_ST_SUN: 2151da177e4SLinus Torvalds fs32 = sysv_encode_dev(dev); 2161da177e4SLinus Torvalds if ((fs32 & 0xffff8000) == 0) { 2171da177e4SLinus Torvalds fs32 = old_encode_dev(dev); 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds break; 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds default: 2221da177e4SLinus Torvalds fs32 = old_encode_dev(dev); 2231da177e4SLinus Torvalds break; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) 22644aa5359SAl Viro ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32); 2271da177e4SLinus Torvalds else 22844aa5359SAl Viro ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32); 2291da177e4SLinus Torvalds } 23010e5dce0SEvgeniy Dushistov 23110e5dce0SEvgeniy Dushistov /** 23210e5dce0SEvgeniy Dushistov * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist 23310e5dce0SEvgeniy Dushistov * read it from disk. 23410e5dce0SEvgeniy Dushistov * @mapping: the address_space to search 23510e5dce0SEvgeniy Dushistov * @index: the page index 23610e5dce0SEvgeniy Dushistov * 23710e5dce0SEvgeniy Dushistov * Locates the desired pagecache page, if not exist we'll read it, 23810e5dce0SEvgeniy Dushistov * locks it, increments its reference 23910e5dce0SEvgeniy Dushistov * count and returns its address. 24010e5dce0SEvgeniy Dushistov * 24110e5dce0SEvgeniy Dushistov */ 24210e5dce0SEvgeniy Dushistov 24310e5dce0SEvgeniy Dushistov struct page *ufs_get_locked_page(struct address_space *mapping, 24410e5dce0SEvgeniy Dushistov pgoff_t index) 24510e5dce0SEvgeniy Dushistov { 24610e5dce0SEvgeniy Dushistov struct page *page; 24710e5dce0SEvgeniy Dushistov 24810e5dce0SEvgeniy Dushistov page = find_lock_page(mapping, index); 24910e5dce0SEvgeniy Dushistov if (!page) { 2506fe6900eSNick Piggin page = read_mapping_page(mapping, index, NULL); 2511fb32b7bSEvgeniy Dushistov 25210e5dce0SEvgeniy Dushistov if (IS_ERR(page)) { 25310e5dce0SEvgeniy Dushistov printk(KERN_ERR "ufs_change_blocknr: " 2546fe6900eSNick Piggin "read_mapping_page error: ino %lu, index: %lu\n", 25510e5dce0SEvgeniy Dushistov mapping->host->i_ino, index); 25610e5dce0SEvgeniy Dushistov goto out; 25710e5dce0SEvgeniy Dushistov } 25810e5dce0SEvgeniy Dushistov 25910e5dce0SEvgeniy Dushistov lock_page(page); 26010e5dce0SEvgeniy Dushistov 2611fb32b7bSEvgeniy Dushistov if (unlikely(page->mapping == NULL)) { 2621fb32b7bSEvgeniy Dushistov /* Truncate got there first */ 2631fb32b7bSEvgeniy Dushistov unlock_page(page); 26409cbfeafSKirill A. Shutemov put_page(page); 26506fa45d3SEvgeniy Dushistov page = NULL; 26606fa45d3SEvgeniy Dushistov goto out; 2671fb32b7bSEvgeniy Dushistov } 2681fb32b7bSEvgeniy Dushistov 26910e5dce0SEvgeniy Dushistov if (!PageUptodate(page) || PageError(page)) { 27010e5dce0SEvgeniy Dushistov unlock_page(page); 27109cbfeafSKirill A. Shutemov put_page(page); 27210e5dce0SEvgeniy Dushistov 27310e5dce0SEvgeniy Dushistov printk(KERN_ERR "ufs_change_blocknr: " 27410e5dce0SEvgeniy Dushistov "can not read page: ino %lu, index: %lu\n", 27510e5dce0SEvgeniy Dushistov mapping->host->i_ino, index); 27610e5dce0SEvgeniy Dushistov 27710e5dce0SEvgeniy Dushistov page = ERR_PTR(-EIO); 27810e5dce0SEvgeniy Dushistov } 27910e5dce0SEvgeniy Dushistov } 28010e5dce0SEvgeniy Dushistov out: 28110e5dce0SEvgeniy Dushistov return page; 28210e5dce0SEvgeniy Dushistov } 283