Release 4.10 fs/sysv/inode.c

/*
 *  linux/fs/sysv/inode.c
 *
 *  minix/inode.c
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  xenix/inode.c
 *  Copyright (C) 1992  Doug Evans
 *
 *  coh/inode.c
 *  Copyright (C) 1993  Pascal Haible, Bruno Haible
 *
 *  sysv/inode.c
 *  Copyright (C) 1993  Paul B. Monday
 *
 *  sysv/inode.c
 *  Copyright (C) 1993  Bruno Haible
 *  Copyright (C) 1997, 1998  Krzysztof G. Baranowski
 *
 *  This file contains code for allocating/freeing inodes and for read/writing
 *  the superblock.
 */

#include <linux/highuid.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <linux/writeback.h>
#include <linux/namei.h>
#include <asm/byteorder.h>
#include "sysv.h"



static int sysv_sync_fs(struct super_block *sb, int wait)
{
	struct sysv_sb_info *sbi = SYSV_SB(sb);
	unsigned long time = get_seconds(), old_time;

	mutex_lock(&sbi->s_lock);

	/*
         * If we are going to write out the super block,
         * then attach current time stamp.
         * But if the filesystem was marked clean, keep it clean.
         */
	old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
	if (sbi->s_type == FSTYPE_SYSV4) {
		if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
			*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
		*sbi->s_sb_time = cpu_to_fs32(sbi, time);
		mark_buffer_dirty(sbi->s_bh2);
	}

	mutex_unlock(&sbi->s_lock);

	return 0;
}

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12.50%
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marco stornelli
10
8.06%
1
12.50%
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andi kleen
2
1.61%
1
12.50%
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124
100.00%
8
100.00%



static int sysv_remount(struct super_block *sb, int *flags, char *data)
{
	struct sysv_sb_info *sbi = SYSV_SB(sb);

	sync_filesystem(sb);
	if (sbi->s_forced_ro)
		*flags |= MS_RDONLY;
	return 0;
}

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static void sysv_put_super(struct super_block *sb)
{
	struct sysv_sb_info *sbi = SYSV_SB(sb);

	if (!(sb->s_flags & MS_RDONLY)) {
		/* XXX ext2 also updates the state here */
		mark_buffer_dirty(sbi->s_bh1);
		if (sbi->s_bh1 != sbi->s_bh2)
			mark_buffer_dirty(sbi->s_bh2);
	}

	brelse(sbi->s_bh1);
	if (sbi->s_bh1 != sbi->s_bh2)
		brelse(sbi->s_bh2);

	kfree(sbi);
}

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christoph hellwig
29
32.95%
2
40.00%
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pre-git
8
9.09%
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88
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5
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static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct sysv_sb_info *sbi = SYSV_SB(sb);
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	buf->f_type = sb->s_magic;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = sbi->s_ndatazones;
	buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
	buf->f_files = sbi->s_ninodes;
	buf->f_ffree = sysv_count_free_inodes(sb);
	buf->f_namelen = SYSV_NAMELEN;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	return 0;
}

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coly li
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linus torvalds
25
17.61%
1
12.50%
christoph hellwig
christoph hellwig
14
9.86%
1
12.50%
david howells
david howells
11
7.75%
1
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andrew morton
andrew morton
1
0.70%
1
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8
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/* 
 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
 */


static inline void read3byte(struct sysv_sb_info *sbi,
	unsigned char * from, unsigned char * to)
{
	if (sbi->s_bytesex == BYTESEX_PDP) {
		to[0] = from[0];
		to[1] = 0;
		to[2] = from[1];
		to[3] = from[2];
	} else if (sbi->s_bytesex == BYTESEX_LE) {
		to[0] = from[0];
		to[1] = from[1];
		to[2] = from[2];
		to[3] = 0;
	} else {
		to[0] = 0;
		to[1] = from[0];
		to[2] = from[1];
		to[3] = from[2];
	}
}

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linus torvalds
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26.75%
2
50.00%
christoph hellwig
christoph hellwig
6
3.82%
1
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static inline void write3byte(struct sysv_sb_info *sbi,
	unsigned char * from, unsigned char * to)
{
	if (sbi->s_bytesex == BYTESEX_PDP) {
		to[0] = from[0];
		to[1] = from[2];
		to[2] = from[3];
	} else if (sbi->s_bytesex == BYTESEX_LE) {
		to[0] = from[0];
		to[1] = from[1];
		to[2] = from[2];
	} else {
		to[0] = from[1];
		to[1] = from[2];
		to[2] = from[3];
	}
}

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christoph hellwig
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static const struct inode_operations sysv_symlink_inode_operations = {
	.get_link	= page_get_link,
	.getattr	= sysv_getattr,
};



void sysv_set_inode(struct inode *inode, dev_t rdev)
{
	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &sysv_file_inode_operations;
		inode->i_fop = &sysv_file_operations;
		inode->i_mapping->a_ops = &sysv_aops;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &sysv_dir_inode_operations;
		inode->i_fop = &sysv_dir_operations;
		inode->i_mapping->a_ops = &sysv_aops;
	} else if (S_ISLNK(inode->i_mode)) {
		inode->i_op = &sysv_symlink_inode_operations;
		inode_nohighmem(inode);
		inode->i_mapping->a_ops = &sysv_aops;
	} else
		init_special_inode(inode, inode->i_mode, rdev);
}

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linus torvalds
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1
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struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
{
	struct sysv_sb_info * sbi = SYSV_SB(sb);
	struct buffer_head * bh;
	struct sysv_inode * raw_inode;
	struct sysv_inode_info * si;
	struct inode *inode;
	unsigned int block;

	if (!ino || ino > sbi->s_ninodes) {
		printk("Bad inode number on dev %s: %d is out of range\n",
		       sb->s_id, ino);
		return ERR_PTR(-EIO);
	}

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	raw_inode = sysv_raw_inode(sb, ino, &bh);
	if (!raw_inode) {
		printk("Major problem: unable to read inode from dev %s\n",
		       inode->i_sb->s_id);
		goto bad_inode;
	}
	/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
	inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
	i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
	i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
	set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
	inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
	inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
	inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
	inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
	inode->i_ctime.tv_nsec = 0;
	inode->i_atime.tv_nsec = 0;
	inode->i_mtime.tv_nsec = 0;
	inode->i_blocks = 0;

	si = SYSV_I(inode);
	for (block = 0; block < 10+1+1+1; block++)
		read3byte(sbi, &raw_inode->i_data[3*block],
				(u8 *)&si->i_data[block]);
	brelse(bh);
	si->i_dir_start_lookup = 0;
	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
		sysv_set_inode(inode,
			       old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
	else
		sysv_set_inode(inode, 0);
	unlock_new_inode(inode);
	return inode;

bad_inode:
	iget_failed(inode);
	return ERR_PTR(-EIO);
}

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david howells
72
16.78%
1
5.88%
andi kleen
andi kleen
30
6.99%
1
5.88%
christoph hellwig
christoph hellwig
24
5.59%
2
11.76%
al viro
al viro
17
3.96%
1
5.88%
eric w. biederman
eric w. biederman
8
1.86%
1
5.88%
miklos szeredi
miklos szeredi
4
0.93%
1
5.88%
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429
100.00%
17
100.00%



static int __sysv_write_inode(struct inode *inode, int wait)
{
	struct super_block * sb = inode->i_sb;
	struct sysv_sb_info * sbi = SYSV_SB(sb);
	struct buffer_head * bh;
	struct sysv_inode * raw_inode;
	struct sysv_inode_info * si;
	unsigned int ino, block;
	int err = 0;

	ino = inode->i_ino;
	if (!ino || ino > sbi->s_ninodes) {
		printk("Bad inode number on dev %s: %d is out of range\n",
		       inode->i_sb->s_id, ino);
		return -EIO;
	}
	raw_inode = sysv_raw_inode(sb, ino, &bh);
	if (!raw_inode) {
		printk("unable to read i-node block\n");
		return -EIO;
	}

	raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
	raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode)));
	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
	raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
	raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
	raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
	raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
	raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);

	si = SYSV_I(inode);
	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
		si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
	for (block = 0; block < 10+1+1+1; block++)
		write3byte(sbi, (u8 *)&si->i_data[block],
			&raw_inode->i_data[3*block]);
	mark_buffer_dirty(bh);
	if (wait) {
                sync_dirty_buffer(bh);
                if (buffer_req(bh) && !buffer_uptodate(bh)) {
                        printk ("IO error syncing sysv inode [%s:%08x]\n",
                                sb->s_id, ino);
                        err = -EIO;
                }
        }
	brelse(bh);
	return 0;
}

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linus torvalds
70
18.23%
4
25.00%
al viro
al viro
26
6.77%
2
12.50%
christoph hellwig
christoph hellwig
26
6.77%
3
18.75%
andi kleen
andi kleen
6
1.56%
1
6.25%
eric w. biederman
eric w. biederman
6
1.56%
1
6.25%
andrew morton
andrew morton
1
0.26%
1
6.25%
Total
384
100.00%
16
100.00%



int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
}

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int sysv_sync_inode(struct inode *inode)
{
	return __sysv_write_inode(inode, 1);
}

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2
11.11%
1
33.33%
christoph hellwig
christoph hellwig
1
5.56%
1
33.33%
Total
18
100.00%
3
100.00%



static void sysv_evict_inode(struct inode *inode)
{
	truncate_inode_pages_final(&inode->i_data);
	if (!inode->i_nlink) {
		inode->i_size = 0;
		sysv_truncate(inode);
	}
	invalidate_inode_buffers(inode);
	clear_inode(inode);
	if (!inode->i_nlink)
		sysv_free_inode(inode);
}

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linus torvalds
16
26.23%
1
14.29%
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pre-git
10
16.39%
2
28.57%
mark fasheh
mark fasheh
7
11.48%
1
14.29%
jan kara
jan kara
1
1.64%
1
14.29%
johannes weiner
johannes weiner
1
1.64%
1
14.29%
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61
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7
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static struct kmem_cache *sysv_inode_cachep;



static struct inode *sysv_alloc_inode(struct super_block *sb)
{
	struct sysv_inode_info *si;

	si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
	if (!si)
		return NULL;
	return &si->vfs_inode;
}

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linus torvalds
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christoph lameter
1
2.44%
1
50.00%
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static void sysv_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
}

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nick piggin
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linus torvalds
18
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static void sysv_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, sysv_i_callback);
}

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static void init_once(void *p)
{
	struct sysv_inode_info *si = (struct sysv_inode_info *)p;

	inode_init_once(&si->vfs_inode);
}

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30
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const struct super_operations sysv_sops = {
	.alloc_inode	= sysv_alloc_inode,
	.destroy_inode	= sysv_destroy_inode,
	.write_inode	= sysv_write_inode,
	.evict_inode	= sysv_evict_inode,
	.put_super	= sysv_put_super,
	.sync_fs	= sysv_sync_fs,
	.remount_fs	= sysv_remount,
	.statfs		= sysv_statfs,
};



int __init sysv_init_icache(void)
{
	sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
			sizeof(struct sysv_inode_info), 0,
			SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
			init_once);
	if (!sysv_inode_cachep)
		return -ENOMEM;
	return 0;
}

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linus torvalds
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vladimir davydov
2
4.65%
1
25.00%
paul jackson
paul jackson
2
4.65%
1
25.00%
andrew morton
andrew morton
1
2.33%
1
25.00%
Total
43
100.00%
4
100.00%



void sysv_destroy_icache(void)
{
	/*
         * Make sure all delayed rcu free inodes are flushed before we
         * destroy cache.
         */
	rcu_barrier();
	kmem_cache_destroy(sysv_inode_cachep);
}
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linus torvalds
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kirill a. shutemov
4
25.00%
1
50.00%
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16
100.00%
2
100.00%

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linus torvalds
799
39.40%
7
10.94%
pre-git
pre-git
599
29.54%
15
23.44%
christoph hellwig
christoph hellwig
202
9.96%
9
14.06%
al viro
al viro
145
7.15%
8
12.50%
david howells
david howells
83
4.09%
2
3.12%
coly li
coly li
44
2.17%
1
1.56%
nick piggin
nick piggin
39
1.92%
1
1.56%
andi kleen
andi kleen
38
1.87%
1
1.56%
art haas
art haas
15
0.74%
1
1.56%
eric w. biederman
eric w. biederman
14
0.69%
1
1.56%
marco stornelli
marco stornelli
10
0.49%
1
1.56%
mark fasheh
mark fasheh
7
0.35%
1
1.56%
christoph lameter
christoph lameter
6
0.30%
3
4.69%
theodore tso
theodore tso
5
0.25%
1
1.56%
miklos szeredi
miklos szeredi
4
0.20%
1
1.56%
kirill a. shutemov
kirill a. shutemov
4
0.20%
1
1.56%
duane griffin
duane griffin
3
0.15%
1
1.56%
andrew morton
andrew morton
3
0.15%
3
4.69%
vladimir davydov
vladimir davydov
2
0.10%
1
1.56%
paul jackson
paul jackson
2
0.10%
1
1.56%
arjan van de ven
arjan van de ven
1
0.05%
1
1.56%
jan kara
jan kara
1
0.05%
1
1.56%
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johannes weiner
1
0.05%
1
1.56%
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josef 'jeff' sipek
1
0.05%
1
1.56%
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2028
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64
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Directory: fs/sysv

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