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/ialloc.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/ialloc.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 inodes.
^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/kernel.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) #include <linux/stddef.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 25) #include <linux/sched.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26) #include <linux/stat.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) #include <linux/string.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) #include <linux/buffer_head.h>
46c23d7f520e3 (Lubomir Rintel 2010-06-29 15:05:38 -0700 29) #include <linux/writeback.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30) #include "sysv.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) /* We don't trust the value of
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) sb->sv_sbd2->s_tinode = *sb->sv_sb_total_free_inodes
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34) but we nevertheless keep it up to date. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) /* An inode on disk is considered free if both i_mode == 0 and i_nlink == 0. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 37)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) /* return &sb->sv_sb_fic_inodes[i] = &sbd->s_inode[i]; */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) static inline sysv_ino_t *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) sv_sb_fic_inode(struct super_block * sb, unsigned int i)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42) struct sysv_sb_info *sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44) if (sbi->s_bh1 == sbi->s_bh2)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45) return &sbi->s_sb_fic_inodes[i];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46) else {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47) /* 512 byte Xenix FS */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) unsigned int offset = offsetof(struct xenix_super_block, s_inode[i]);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 49) if (offset < 512)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50) return (sysv_ino_t*)(sbi->s_sbd1 + offset);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 51) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) return (sysv_ino_t*)(sbi->s_sbd2 + offset);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 54) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 55)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 56) struct sysv_inode *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57) sysv_raw_inode(struct super_block *sb, unsigned ino, struct buffer_head **bh)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 59) struct sysv_sb_info *sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) struct sysv_inode *res;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) int block = sbi->s_firstinodezone + sbi->s_block_base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63) block += (ino-1) >> sbi->s_inodes_per_block_bits;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 64) *bh = sb_bread(sb, block);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 65) if (!*bh)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 66) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 67) res = (struct sysv_inode *)(*bh)->b_data;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 68) return res + ((ino-1) & sbi->s_inodes_per_block_1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 69) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 70)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 71) static int refill_free_cache(struct super_block *sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 72) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 73) struct sysv_sb_info *sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74) struct buffer_head * bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 75) struct sysv_inode * raw_inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 76) int i = 0, ino;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 77)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 78) ino = SYSV_ROOT_INO+1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79) raw_inode = sysv_raw_inode(sb, ino, &bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) if (!raw_inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 81) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) while (ino <= sbi->s_ninodes) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84) *sv_sb_fic_inode(sb,i++) = cpu_to_fs16(SYSV_SB(sb), ino);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) if (i == sbi->s_fic_size)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88) if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 90) raw_inode = sysv_raw_inode(sb, ino, &bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) if (!raw_inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93) } else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) raw_inode++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 95) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97) out:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 98) return i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 100)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 101) void sysv_free_inode(struct inode * inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 103) struct super_block *sb = inode->i_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104) struct sysv_sb_info *sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105) unsigned int ino;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106) struct buffer_head * bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107) struct sysv_inode * raw_inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108) unsigned count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 110) sb = inode->i_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 111) ino = inode->i_ino;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 112) if (ino <= SYSV_ROOT_INO || ino > sbi->s_ninodes) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113) printk("sysv_free_inode: inode 0,1,2 or nonexistent inode\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 114) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 116) raw_inode = sysv_raw_inode(sb, ino, &bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 117) if (!raw_inode) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 118) printk("sysv_free_inode: unable to read inode block on device "
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119) "%s\n", inode->i_sb->s_id);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 120) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 121) }
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 122) mutex_lock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 123) count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 124) if (count < sbi->s_fic_size) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 125) *sv_sb_fic_inode(sb,count++) = cpu_to_fs16(sbi, ino);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 126) *sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 127) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 128) fs16_add(sbi, sbi->s_sb_total_free_inodes, 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 129) dirty_sb(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 130) memset(raw_inode, 0, sizeof(struct sysv_inode));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 131) mark_buffer_dirty(bh);
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 132) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 133) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 134) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 135)
dd716e64d60f2 (Al Viro 2011-07-26 02:49:38 -0400 136) struct inode * sysv_new_inode(const struct inode * dir, umode_t mode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 137) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 138) struct super_block *sb = dir->i_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 139) struct sysv_sb_info *sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 140) struct inode *inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 141) sysv_ino_t ino;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 142) unsigned count;
46c23d7f520e3 (Lubomir Rintel 2010-06-29 15:05:38 -0700 143) struct writeback_control wbc = {
46c23d7f520e3 (Lubomir Rintel 2010-06-29 15:05:38 -0700 144) .sync_mode = WB_SYNC_NONE
46c23d7f520e3 (Lubomir Rintel 2010-06-29 15:05:38 -0700 145) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 146)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 147) inode = new_inode(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 148) if (!inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 149) return ERR_PTR(-ENOMEM);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 150)
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 151) mutex_lock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 152) count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 153) if (count == 0 || (*sv_sb_fic_inode(sb,count-1) == 0)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 154) count = refill_free_cache(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 155) if (count == 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 156) iput(inode);
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 157) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 158) return ERR_PTR(-ENOSPC);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 159) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 160) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 161) /* Now count > 0. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 162) ino = *sv_sb_fic_inode(sb,--count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 163) *sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 164) fs16_add(sbi, sbi->s_sb_total_free_inodes, -1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 165) dirty_sb(sb);
21cb47be6fb9e (Christian Brauner 2021-01-21 14:19:25 +0100 166) inode_init_owner(&init_user_ns, inode, dir, mode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 167) inode->i_ino = fs16_to_cpu(sbi, ino);
02027d42c3f74 (Deepa Dinamani 2016-09-14 07:48:05 -0700 168) inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
ba52de123d454 (Theodore Ts'o 2006-09-27 01:50:49 -0700 169) inode->i_blocks = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 170) memset(SYSV_I(inode)->i_data, 0, sizeof(SYSV_I(inode)->i_data));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 171) SYSV_I(inode)->i_dir_start_lookup = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 172) insert_inode_hash(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) mark_inode_dirty(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174)
46c23d7f520e3 (Lubomir Rintel 2010-06-29 15:05:38 -0700 175) sysv_write_inode(inode, &wbc); /* ensure inode not allocated again */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 176) mark_inode_dirty(inode); /* cleared by sysv_write_inode() */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 177) /* That's it. */
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 178) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 179) return inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 180) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 181)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 182) unsigned long sysv_count_free_inodes(struct super_block * sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 183) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 184) struct sysv_sb_info *sbi = SYSV_SB(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 185) struct buffer_head * bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 186) struct sysv_inode * raw_inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 187) int ino, count, sb_count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 188)
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 189) mutex_lock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 190)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 191) sb_count = fs16_to_cpu(sbi, *sbi->s_sb_total_free_inodes);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 192)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 193) if (0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 194) goto trust_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 195)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 196) /* this causes a lot of disk traffic ... */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 197) count = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 198) ino = SYSV_ROOT_INO+1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 199) raw_inode = sysv_raw_inode(sb, ino, &bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 200) if (!raw_inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 201) goto Eio;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 202) while (ino <= sbi->s_ninodes) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 203) if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 204) count++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 207) raw_inode = sysv_raw_inode(sb, ino, &bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208) if (!raw_inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 209) goto Eio;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 210) } else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 211) raw_inode++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 212) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 213) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 214) if (count != sb_count)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 215) goto Einval;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 216) out:
c07cb01c45d6f (Marco Stornelli 2012-10-06 12:41:46 +0200 217) mutex_unlock(&sbi->s_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 218) return count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 219)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 220) Einval:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 221) printk("sysv_count_free_inodes: "
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 222) "free inode count was %d, correcting to %d\n",
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 223) sb_count, count);
bc98a42c1f7d0 (David Howells 2017-07-17 08:45:34 +0100 224) if (!sb_rdonly(sb)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 225) *sbi->s_sb_total_free_inodes = cpu_to_fs16(SYSV_SB(sb), count);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 226) dirty_sb(sb);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 227) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 228) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 229)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) Eio:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 231) printk("sysv_count_free_inodes: unable to read inode table\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 232) trust_sb:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 233) count = sb_count;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 234) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 235) }
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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