VisionFive2 Linux kernel

b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100   1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   2) /*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   3)  *  linux/fs/ufs/cylinder.c
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   4)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   5)  * Copyright (C) 1998
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   6)  * Daniel Pirkl <daniel.pirkl@email.cz>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   7)  * Charles University, Faculty of Mathematics and Physics
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   8)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700   9)  *  ext2 - inode (block) bitmap caching inspired
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  10)  */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  11) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  12) #include <linux/fs.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  13) #include <linux/time.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  14) #include <linux/stat.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  15) #include <linux/string.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  16) #include <linux/bitops.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  17) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  18) #include <asm/byteorder.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  19) 
e542059884bb6 (Mike Frysinger     2008-02-08 04:21:31 -0800  20) #include "ufs_fs.h"
bcd6d4ecf6868 (Christoph Hellwig  2007-10-16 23:26:51 -0700  21) #include "ufs.h"
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  22) #include "swab.h"
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  23) #include "util.h"
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  24) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  25) /*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  26)  * Read cylinder group into cache. The memory space for ufs_cg_private_info
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  27)  * structure is already allocated during ufs_read_super.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  28)  */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  29) static void ufs_read_cylinder (struct super_block * sb,
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  30) 	unsigned cgno, unsigned bitmap_nr)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  31) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  32) 	struct ufs_sb_info * sbi = UFS_SB(sb);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  33) 	struct ufs_sb_private_info * uspi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  34) 	struct ufs_cg_private_info * ucpi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  35) 	struct ufs_cylinder_group * ucg;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  36) 	unsigned i, j;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  37) 
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700  38) 	UFSD("ENTER, cgno %u, bitmap_nr %u\n", cgno, bitmap_nr);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  39) 	uspi = sbi->s_uspi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  40) 	ucpi = sbi->s_ucpi[bitmap_nr];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  41) 	ucg = (struct ufs_cylinder_group *)sbi->s_ucg[cgno]->b_data;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  42) 
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700  43) 	UCPI_UBH(ucpi)->fragment = ufs_cgcmin(cgno);
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700  44) 	UCPI_UBH(ucpi)->count = uspi->s_cgsize >> sb->s_blocksize_bits;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  45) 	/*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  46) 	 * We have already the first fragment of cylinder group block in buffer
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  47) 	 */
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700  48) 	UCPI_UBH(ucpi)->bh[0] = sbi->s_ucg[cgno];
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700  49) 	for (i = 1; i < UCPI_UBH(ucpi)->count; i++)
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700  50) 		if (!(UCPI_UBH(ucpi)->bh[i] = sb_bread(sb, UCPI_UBH(ucpi)->fragment + i)))
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  51) 			goto failed;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  52) 	sbi->s_cgno[bitmap_nr] = cgno;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  53) 			
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  54) 	ucpi->c_cgx	= fs32_to_cpu(sb, ucg->cg_cgx);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  55) 	ucpi->c_ncyl	= fs16_to_cpu(sb, ucg->cg_ncyl);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  56) 	ucpi->c_niblk	= fs16_to_cpu(sb, ucg->cg_niblk);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  57) 	ucpi->c_ndblk	= fs32_to_cpu(sb, ucg->cg_ndblk);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  58) 	ucpi->c_rotor	= fs32_to_cpu(sb, ucg->cg_rotor);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  59) 	ucpi->c_frotor	= fs32_to_cpu(sb, ucg->cg_frotor);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  60) 	ucpi->c_irotor	= fs32_to_cpu(sb, ucg->cg_irotor);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  61) 	ucpi->c_btotoff	= fs32_to_cpu(sb, ucg->cg_btotoff);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  62) 	ucpi->c_boff	= fs32_to_cpu(sb, ucg->cg_boff);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  63) 	ucpi->c_iusedoff = fs32_to_cpu(sb, ucg->cg_iusedoff);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  64) 	ucpi->c_freeoff	= fs32_to_cpu(sb, ucg->cg_freeoff);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  65) 	ucpi->c_nextfreeoff = fs32_to_cpu(sb, ucg->cg_nextfreeoff);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  66) 	ucpi->c_clustersumoff = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_clustersumoff);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  67) 	ucpi->c_clusteroff = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_clusteroff);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  68) 	ucpi->c_nclusterblks = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_nclusterblks);
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700  69) 	UFSD("EXIT\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  70) 	return;	
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  71) 	
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  72) failed:
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  73) 	for (j = 1; j < i; j++)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  74) 		brelse (sbi->s_ucg[j]);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  75) 	sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  76) 	ufs_error (sb, "ufs_read_cylinder", "can't read cylinder group block %u", cgno);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  77) }
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  78) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  79) /*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  80)  * Remove cylinder group from cache, doesn't release memory
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  81)  * allocated for cylinder group (this is done at ufs_put_super only).
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  82)  */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  83) void ufs_put_cylinder (struct super_block * sb, unsigned bitmap_nr)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  84) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  85) 	struct ufs_sb_info * sbi = UFS_SB(sb);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  86) 	struct ufs_sb_private_info * uspi; 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  87) 	struct ufs_cg_private_info * ucpi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  88) 	struct ufs_cylinder_group * ucg;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  89) 	unsigned i;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  90) 
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700  91) 	UFSD("ENTER, bitmap_nr %u\n", bitmap_nr);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  92) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  93) 	uspi = sbi->s_uspi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  94) 	if (sbi->s_cgno[bitmap_nr] == UFS_CGNO_EMPTY) {
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700  95) 		UFSD("EXIT\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  96) 		return;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  97) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  98) 	ucpi = sbi->s_ucpi[bitmap_nr];
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700  99) 	ucg = ubh_get_ucg(UCPI_UBH(ucpi));
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 100) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 101) 	if (uspi->s_ncg > UFS_MAX_GROUP_LOADED && bitmap_nr >= sbi->s_cg_loaded) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 102) 		ufs_panic (sb, "ufs_put_cylinder", "internal error");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 103) 		return;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 104) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 105) 	/*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 106) 	 * rotor is not so important data, so we put it to disk 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 107) 	 * at the end of working with cylinder
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 108) 	 */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 109) 	ucg->cg_rotor = cpu_to_fs32(sb, ucpi->c_rotor);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 110) 	ucg->cg_frotor = cpu_to_fs32(sb, ucpi->c_frotor);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 111) 	ucg->cg_irotor = cpu_to_fs32(sb, ucpi->c_irotor);
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700 112) 	ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700 113) 	for (i = 1; i < UCPI_UBH(ucpi)->count; i++) {
9695ef16ed4e0 (Evgeniy Dushistov  2006-06-25 05:47:22 -0700 114) 		brelse (UCPI_UBH(ucpi)->bh[i]);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 115) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 116) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 117) 	sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700 118) 	UFSD("EXIT\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 119) }
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 120) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 121) /*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 122)  * Find cylinder group in cache and return it as pointer.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 123)  * If cylinder group is not in cache, we will load it from disk.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 124)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 125)  * The cache is managed by LRU algorithm. 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 126)  */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 127) struct ufs_cg_private_info * ufs_load_cylinder (
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 128) 	struct super_block * sb, unsigned cgno)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 129) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 130) 	struct ufs_sb_info * sbi = UFS_SB(sb);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 131) 	struct ufs_sb_private_info * uspi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 132) 	struct ufs_cg_private_info * ucpi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 133) 	unsigned cg, i, j;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 134) 
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700 135) 	UFSD("ENTER, cgno %u\n", cgno);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 136) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 137) 	uspi = sbi->s_uspi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 138) 	if (cgno >= uspi->s_ncg) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 139) 		ufs_panic (sb, "ufs_load_cylinder", "internal error, high number of cg");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 140) 		return NULL;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 141) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 142) 	/*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 143) 	 * Cylinder group number cg it in cache and it was last used
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 144) 	 */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 145) 	if (sbi->s_cgno[0] == cgno) {
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700 146) 		UFSD("EXIT\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 147) 		return sbi->s_ucpi[0];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 148) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 149) 	/*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 150) 	 * Number of cylinder groups is not higher than UFS_MAX_GROUP_LOADED
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 151) 	 */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 152) 	if (uspi->s_ncg <= UFS_MAX_GROUP_LOADED) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 153) 		if (sbi->s_cgno[cgno] != UFS_CGNO_EMPTY) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 154) 			if (sbi->s_cgno[cgno] != cgno) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 155) 				ufs_panic (sb, "ufs_load_cylinder", "internal error, wrong number of cg in cache");
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700 156) 				UFSD("EXIT (FAILED)\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 157) 				return NULL;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 158) 			}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 159) 			else {
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700 160) 				UFSD("EXIT\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 161) 				return sbi->s_ucpi[cgno];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 162) 			}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 163) 		} else {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 164) 			ufs_read_cylinder (sb, cgno, cgno);
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700 165) 			UFSD("EXIT\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 166) 			return sbi->s_ucpi[cgno];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 167) 		}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 168) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 169) 	/*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 170) 	 * Cylinder group number cg is in cache but it was not last used, 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 171) 	 * we will move to the first position
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 172) 	 */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 173) 	for (i = 0; i < sbi->s_cg_loaded && sbi->s_cgno[i] != cgno; i++);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 174) 	if (i < sbi->s_cg_loaded && sbi->s_cgno[i] == cgno) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 175) 		cg = sbi->s_cgno[i];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 176) 		ucpi = sbi->s_ucpi[i];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 177) 		for (j = i; j > 0; j--) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 178) 			sbi->s_cgno[j] = sbi->s_cgno[j-1];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 179) 			sbi->s_ucpi[j] = sbi->s_ucpi[j-1];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 180) 		}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 181) 		sbi->s_cgno[0] = cg;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 182) 		sbi->s_ucpi[0] = ucpi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 183) 	/*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 184) 	 * Cylinder group number cg is not in cache, we will read it from disk
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 185) 	 * and put it to the first position
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 186) 	 */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 187) 	} else {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 188) 		if (sbi->s_cg_loaded < UFS_MAX_GROUP_LOADED)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 189) 			sbi->s_cg_loaded++;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 190) 		else
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 191) 			ufs_put_cylinder (sb, UFS_MAX_GROUP_LOADED-1);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 192) 		ucpi = sbi->s_ucpi[sbi->s_cg_loaded - 1];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 193) 		for (j = sbi->s_cg_loaded - 1; j > 0; j--) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 194) 			sbi->s_cgno[j] = sbi->s_cgno[j-1];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 195) 			sbi->s_ucpi[j] = sbi->s_ucpi[j-1];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 196) 		}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 197) 		sbi->s_ucpi[0] = ucpi;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 198) 		ufs_read_cylinder (sb, cgno, 0);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 199) 	}
abf5d15fd2e52 (Evgeniy Dushistov  2006-06-25 05:47:24 -0700 200) 	UFSD("EXIT\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 201) 	return sbi->s_ucpi[0];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 202) }