/*
 *  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(inode);
	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;
}
43a40c9aaa836f9b7431'>b272f732f888d4cf43c943a40c9aaa836f9b7431</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/soc?h=nds-private-remove&amp;id=3ddc76dfc786cc6f87852693227fb0b1f124f807&amp;id2=b272f732f888d4cf43c943a40c9aaa836f9b7431'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/soc?h=nds-private-remove&amp;id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>1f3a8e49d8f28f498b8694464623ac20aebfe62a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/soc?h=nds-private-remove&amp;id=3ddc76dfc786cc6f87852693227fb0b1f124f807&amp;id2=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip</div><div class='commit-msg'>Pull timer type cleanups from Thomas Gleixner:
 "This series does a tree wide cleanup of types related to
  timers/timekeeping.

   - Get rid of cycles_t and use a plain u64. The type is not really
     helpful and caused more confusion than clarity

   - Get rid of the ktime union. The union has become useless as we use
     the scalar nanoseconds storage unconditionally now. The 32bit
     timespec alike storage got removed due to the Y2038 limitations
     some time ago.

     That leaves the odd union access around for no reason. Clean it up.

  Both changes have been done with coccinelle and a small amount of
  manual mopping up"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  ktime: Get rid of ktime_equal()
  ktime: Cleanup ktime_set() usage
  ktime: Get rid of the union
  clocksource: Use a plain u64 instead of cycle_t
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=3ddc76dfc786cc6f87852693227fb0b1f124f807'>Diffstat</a> (limited to 'include/soc')</div><table summary='diffstat' class='diffstat'>