Revision 5baaf3b9efe127d239038de9219d381f4d882b26 authored by Lee Jones on 28 June 2016, 08:24:40 UTC, committed by Lee Jones on 01 July 2016, 09:52:16 UTC
We're making all reset line users specify whether their lines are shared with other IP or they operate them exclusively. In this case the line is exclusively used only by this IP, so use the *_exclusive() API accordingly. Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
1 parent f5f3583
ialloc.c
/*
* linux/fs/sysv/ialloc.c
*
* minix/bitmap.c
* Copyright (C) 1991, 1992 Linus Torvalds
*
* ext/freelists.c
* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
*
* xenix/alloc.c
* Copyright (C) 1992 Doug Evans
*
* coh/alloc.c
* Copyright (C) 1993 Pascal Haible, Bruno Haible
*
* sysv/ialloc.c
* Copyright (C) 1993 Bruno Haible
*
* This file contains code for allocating/freeing inodes.
*/
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include "sysv.h"
/* We don't trust the value of
sb->sv_sbd2->s_tinode = *sb->sv_sb_total_free_inodes
but we nevertheless keep it up to date. */
/* An inode on disk is considered free if both i_mode == 0 and i_nlink == 0. */
/* return &sb->sv_sb_fic_inodes[i] = &sbd->s_inode[i]; */
static inline sysv_ino_t *
sv_sb_fic_inode(struct super_block * sb, unsigned int i)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
if (sbi->s_bh1 == sbi->s_bh2)
return &sbi->s_sb_fic_inodes[i];
else {
/* 512 byte Xenix FS */
unsigned int offset = offsetof(struct xenix_super_block, s_inode[i]);
if (offset < 512)
return (sysv_ino_t*)(sbi->s_sbd1 + offset);
else
return (sysv_ino_t*)(sbi->s_sbd2 + offset);
}
}
struct sysv_inode *
sysv_raw_inode(struct super_block *sb, unsigned ino, struct buffer_head **bh)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct sysv_inode *res;
int block = sbi->s_firstinodezone + sbi->s_block_base;
block += (ino-1) >> sbi->s_inodes_per_block_bits;
*bh = sb_bread(sb, block);
if (!*bh)
return NULL;
res = (struct sysv_inode *)(*bh)->b_data;
return res + ((ino-1) & sbi->s_inodes_per_block_1);
}
static int refill_free_cache(struct super_block *sb)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct buffer_head * bh;
struct sysv_inode * raw_inode;
int i = 0, ino;
ino = SYSV_ROOT_INO+1;
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto out;
while (ino <= sbi->s_ninodes) {
if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0) {
*sv_sb_fic_inode(sb,i++) = cpu_to_fs16(SYSV_SB(sb), ino);
if (i == sbi->s_fic_size)
break;
}
if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
brelse(bh);
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto out;
} else
raw_inode++;
}
brelse(bh);
out:
return i;
}
void sysv_free_inode(struct inode * inode)
{
struct super_block *sb = inode->i_sb;
struct sysv_sb_info *sbi = SYSV_SB(sb);
unsigned int ino;
struct buffer_head * bh;
struct sysv_inode * raw_inode;
unsigned count;
sb = inode->i_sb;
ino = inode->i_ino;
if (ino <= SYSV_ROOT_INO || ino > sbi->s_ninodes) {
printk("sysv_free_inode: inode 0,1,2 or nonexistent inode\n");
return;
}
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode) {
printk("sysv_free_inode: unable to read inode block on device "
"%s\n", inode->i_sb->s_id);
return;
}
mutex_lock(&sbi->s_lock);
count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
if (count < sbi->s_fic_size) {
*sv_sb_fic_inode(sb,count++) = cpu_to_fs16(sbi, ino);
*sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
}
fs16_add(sbi, sbi->s_sb_total_free_inodes, 1);
dirty_sb(sb);
memset(raw_inode, 0, sizeof(struct sysv_inode));
mark_buffer_dirty(bh);
mutex_unlock(&sbi->s_lock);
brelse(bh);
}
struct inode * sysv_new_inode(const struct inode * dir, umode_t mode)
{
struct super_block *sb = dir->i_sb;
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct inode *inode;
sysv_ino_t ino;
unsigned count;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE
};
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
mutex_lock(&sbi->s_lock);
count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
if (count == 0 || (*sv_sb_fic_inode(sb,count-1) == 0)) {
count = refill_free_cache(sb);
if (count == 0) {
iput(inode);
mutex_unlock(&sbi->s_lock);
return ERR_PTR(-ENOSPC);
}
}
/* Now count > 0. */
ino = *sv_sb_fic_inode(sb,--count);
*sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
fs16_add(sbi, sbi->s_sb_total_free_inodes, -1);
dirty_sb(sb);
inode_init_owner(inode, dir, mode);
inode->i_ino = fs16_to_cpu(sbi, ino);
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
inode->i_blocks = 0;
memset(SYSV_I(inode)->i_data, 0, sizeof(SYSV_I(inode)->i_data));
SYSV_I(inode)->i_dir_start_lookup = 0;
insert_inode_hash(inode);
mark_inode_dirty(inode);
sysv_write_inode(inode, &wbc); /* ensure inode not allocated again */
mark_inode_dirty(inode); /* cleared by sysv_write_inode() */
/* That's it. */
mutex_unlock(&sbi->s_lock);
return inode;
}
unsigned long sysv_count_free_inodes(struct super_block * sb)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct buffer_head * bh;
struct sysv_inode * raw_inode;
int ino, count, sb_count;
mutex_lock(&sbi->s_lock);
sb_count = fs16_to_cpu(sbi, *sbi->s_sb_total_free_inodes);
if (0)
goto trust_sb;
/* this causes a lot of disk traffic ... */
count = 0;
ino = SYSV_ROOT_INO+1;
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto Eio;
while (ino <= sbi->s_ninodes) {
if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0)
count++;
if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
brelse(bh);
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto Eio;
} else
raw_inode++;
}
brelse(bh);
if (count != sb_count)
goto Einval;
out:
mutex_unlock(&sbi->s_lock);
return count;
Einval:
printk("sysv_count_free_inodes: "
"free inode count was %d, correcting to %d\n",
sb_count, count);
if (!(sb->s_flags & MS_RDONLY)) {
*sbi->s_sb_total_free_inodes = cpu_to_fs16(SYSV_SB(sb), count);
dirty_sb(sb);
}
goto out;
Eio:
printk("sysv_count_free_inodes: unable to read inode table\n");
trust_sb:
count = sb_count;
goto out;
}
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