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/sysv/balloc.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * minix/bitmap.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) * Copyright (C) 1991, 1992 Linus Torvalds
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) * ext/freelists.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) * xenix/alloc.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) * Copyright (C) 1992 Doug Evans
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) * coh/alloc.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) * Copyright (C) 1993 Pascal Haible, Bruno Haible
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 17) * sysv/balloc.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) * Copyright (C) 1993 Bruno Haible
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20) * This file contains code for allocating/freeing blocks.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 21) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23) #include <linux/buffer_head.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) #include <linux/string.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 25) #include "sysv.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) /* We don't trust the value of
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) sb->sv_sbd2->s_tfree = *sb->sv_free_blocks
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 29) but we nevertheless keep it up to date. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31) static inline sysv_zone_t *get_chunk(struct super_block *sb, struct buffer_head *bh)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) char *bh_data = bh->b_data;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35) if (SYSV_SB(sb)->s_type == FSTYPE_SYSV4)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) return (sysv_zone_t*)(bh_data+4);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 37) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) return (sysv_zone_t*)(bh_data+2);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) /* NOTE NOTE NOTE: nr is a block number _as_ _stored_ _on_ _disk_ */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43) void sysv_free_block(struct super_block * sb, sysv_zone_t nr)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45) struct sysv_sb_info * sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46) struct buffer_head * bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47) sysv_zone_t *blocks = sbi->s_bcache;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) unsigned count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 49) unsigned block = fs32_to_cpu(sbi, nr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 51) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) * This code does not work at all for AFS (it has a bitmap
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53) * free list). As AFS is supposed to be read-only no one
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 54) * should call this for an AFS filesystem anyway...
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 55) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 56) if (sbi->s_type == FSTYPE_AFS)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 59) if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) printk("sysv_free_block: trying to free block not in datazone\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63)
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 64) mutex_lock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 65) count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 66)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 67) if (count > sbi->s_flc_size) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 68) printk("sysv_free_block: flc_count > flc_size\n");
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 69) mutex_unlock(&sbi->s_lock);
^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) /* If the free list head in super-block is full, it is copied
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 73) * into this block being freed, ditto if it's completely empty
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74) * (applies only on Coherent).
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 75) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 76) if (count == sbi->s_flc_size || count == 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 77) block += sbi->s_block_base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 78) bh = sb_getblk(sb, block);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79) if (!bh) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) printk("sysv_free_block: getblk() failed\n");
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 81) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84) memset(bh->b_data, 0, sb->s_blocksize);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) *(__fs16*)bh->b_data = cpu_to_fs16(sbi, count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) memcpy(get_chunk(sb,bh), blocks, count * sizeof(sysv_zone_t));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) mark_buffer_dirty(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88) set_buffer_uptodate(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 90) count = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92) sbi->s_bcache[count++] = nr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) *sbi->s_bcache_count = cpu_to_fs16(sbi, count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 95) fs32_add(sbi, sbi->s_free_blocks, 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) dirty_sb(sb);
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 97) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 98) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 100) sysv_zone_t sysv_new_block(struct super_block * sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 101) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) struct sysv_sb_info *sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 103) unsigned int block;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104) sysv_zone_t nr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105) struct buffer_head * bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106) unsigned count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107)
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 108) mutex_lock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109) count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 110)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 111) if (count == 0) /* Applies only to Coherent FS */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 112) goto Enospc;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113) nr = sbi->s_bcache[--count];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 114) if (nr == 0) /* Applies only to Xenix FS, SystemV FS */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115) goto Enospc;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 116)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 117) block = fs32_to_cpu(sbi, nr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 118)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119) *sbi->s_bcache_count = cpu_to_fs16(sbi, count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 120)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 121) if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 122) printk("sysv_new_block: new block %d is not in data zone\n",
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 123) block);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 124) goto Enospc;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 125) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 126)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 127) if (count == 0) { /* the last block continues the free list */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 128) unsigned count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 129)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 130) block += sbi->s_block_base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 131) if (!(bh = sb_bread(sb, block))) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 132) printk("sysv_new_block: cannot read free-list block\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 133) /* retry this same block next time */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 134) *sbi->s_bcache_count = cpu_to_fs16(sbi, 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 135) goto Enospc;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 136) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 137) count = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 138) if (count > sbi->s_flc_size) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 139) printk("sysv_new_block: free-list block with >flc_size entries\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 140) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 141) goto Enospc;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 142) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 143) *sbi->s_bcache_count = cpu_to_fs16(sbi, count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 144) memcpy(sbi->s_bcache, get_chunk(sb, bh),
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 145) count * sizeof(sysv_zone_t));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 146) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 147) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 148) /* Now the free list head in the superblock is valid again. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 149) fs32_add(sbi, sbi->s_free_blocks, -1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 150) dirty_sb(sb);
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 151) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 152) return nr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 153)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 154) Enospc:
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 155) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 156) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 157) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 158)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 159) unsigned long sysv_count_free_blocks(struct super_block * sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 160) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 161) struct sysv_sb_info * sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 162) int sb_count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 163) int count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 164) struct buffer_head * bh = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 165) sysv_zone_t *blocks;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 166) unsigned block;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 167) int n;
^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) * This code does not work at all for AFS (it has a bitmap
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 171) * free list). As AFS is supposed to be read-only we just
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 172) * lie and say it has no free block at all.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174) if (sbi->s_type == FSTYPE_AFS)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 175) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 176)
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 177) mutex_lock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 178) sb_count = fs32_to_cpu(sbi, *sbi->s_free_blocks);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 179)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 180) if (0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 181) goto trust_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 182)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 183) /* this causes a lot of disk traffic ... */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 184) count = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 185) n = fs16_to_cpu(sbi, *sbi->s_bcache_count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 186) blocks = sbi->s_bcache;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 187) while (1) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 188) sysv_zone_t zone;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 189) if (n > sbi->s_flc_size)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 190) goto E2big;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 191) zone = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 192) while (n && (zone = blocks[--n]) != 0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 193) count++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 194) if (zone == 0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 195) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 196)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 197) block = fs32_to_cpu(sbi, zone);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 198) if (bh)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 199) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 200)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 201) if (block < sbi->s_firstdatazone || block >= sbi->s_nzones)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 202) goto Einval;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 203) block += sbi->s_block_base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 204) bh = sb_bread(sb, block);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) if (!bh)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206) goto Eio;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 207) n = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208) blocks = get_chunk(sb, bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 209) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 210) if (bh)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 211) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 212) if (count != sb_count)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 213) goto Ecount;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 214) done:
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 215) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 216) return count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 217)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 218) Einval:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 219) printk("sysv_count_free_blocks: new block %d is not in data zone\n",
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 220) block);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 221) goto trust_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 222) Eio:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 223) printk("sysv_count_free_blocks: cannot read free-list block\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 224) goto trust_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 225) E2big:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 226) printk("sysv_count_free_blocks: >flc_size entries in free-list block\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 227) if (bh)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 228) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 229) trust_sb:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) count = sb_count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 231) goto done;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 232) Ecount:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 233) printk("sysv_count_free_blocks: free block count was %d, "
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 234) "correcting to %d\n", sb_count, count);
bc98a42c1f7d0 (David Howells 2017-07-17 08:45:34 +0100 235) if (!sb_rdonly(sb)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 236) *sbi->s_free_blocks = cpu_to_fs32(sbi, count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 237) dirty_sb(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 238) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 239) goto done;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 240) }
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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