Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Copyright (C) 1996  Gertjan van Wingerde
 *	Minix V2 fs support.
 *
 *  Modified for 680x0 by Andreas Schwab
 *  Updated to filesystem version 3 by Daniel Aragones
 */
 
#include <linux/module.h>
#include "minix.h"
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/vfs.h>
#include <linux/writeback.h>
 
static int minix_write_inode(struct inode *inode,
<------><------>struct writeback_control *wbc);
static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
static int minix_remount (struct super_block * sb, int * flags, char * data);
 
static void minix_evict_inode(struct inode *inode)
{
<------>truncate_inode_pages_final(&inode->i_data);
<------>if (!inode->i_nlink) {
<------><------>inode->i_size = 0;
<------><------>minix_truncate(inode);
<------>}
<------>invalidate_inode_buffers(inode);
<------>clear_inode(inode);
<------>if (!inode->i_nlink)
<------><------>minix_free_inode(inode);
}
 
static void minix_put_super(struct super_block *sb)
{
<------>int i;
<------>struct minix_sb_info *sbi = minix_sb(sb);
 
<------>if (!sb_rdonly(sb)) {
<------><------>if (sbi->s_version != MINIX_V3)	 /* s_state is now out from V3 sb */
<------><------><------>sbi->s_ms->s_state = sbi->s_mount_state;
<------><------>mark_buffer_dirty(sbi->s_sbh);
<------>}
<------>for (i = 0; i < sbi->s_imap_blocks; i++)
<------><------>brelse(sbi->s_imap[i]);
<------>for (i = 0; i < sbi->s_zmap_blocks; i++)
<------><------>brelse(sbi->s_zmap[i]);
<------>brelse (sbi->s_sbh);
<------>kfree(sbi->s_imap);
<------>sb->s_fs_info = NULL;
<------>kfree(sbi);
}
 
static struct kmem_cache * minix_inode_cachep;
 
static struct inode *minix_alloc_inode(struct super_block *sb)
{
<------>struct minix_inode_info *ei;
<------>ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
<------>if (!ei)
<------><------>return NULL;
<------>return &ei->vfs_inode;
}
 
static void minix_free_in_core_inode(struct inode *inode)
{
<------>kmem_cache_free(minix_inode_cachep, minix_i(inode));
}
 
static void init_once(void *foo)
{
<------>struct minix_inode_info *ei = (struct minix_inode_info *) foo;
 
<------>inode_init_once(&ei->vfs_inode);
}
 
static int __init init_inodecache(void)
{
<------>minix_inode_cachep = kmem_cache_create("minix_inode_cache",
<------><------><------><------><------>     sizeof(struct minix_inode_info),
<------><------><------><------><------>     0, (SLAB_RECLAIM_ACCOUNT|
<------><------><------><------><------><------>SLAB_MEM_SPREAD|SLAB_ACCOUNT),
<------><------><------><------><------>     init_once);
<------>if (minix_inode_cachep == NULL)
<------><------>return -ENOMEM;
<------>return 0;
}
 
static void destroy_inodecache(void)
{
<------>/*
<------> * Make sure all delayed rcu free inodes are flushed before we
<------> * destroy cache.
<------> */
<------>rcu_barrier();
<------>kmem_cache_destroy(minix_inode_cachep);
}
 
static const struct super_operations minix_sops = {
<------>.alloc_inode	= minix_alloc_inode,
<------>.free_inode	= minix_free_in_core_inode,
<------>.write_inode	= minix_write_inode,
<------>.evict_inode	= minix_evict_inode,
<------>.put_super	= minix_put_super,
<------>.statfs		= minix_statfs,
<------>.remount_fs	= minix_remount,
};
 
static int minix_remount (struct super_block * sb, int * flags, char * data)
{
<------>struct minix_sb_info * sbi = minix_sb(sb);
<------>struct minix_super_block * ms;
 
<------>sync_filesystem(sb);
<------>ms = sbi->s_ms;
<------>if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
<------><------>return 0;
<------>if (*flags & SB_RDONLY) {
<------><------>if (ms->s_state & MINIX_VALID_FS ||
<------><------>    !(sbi->s_mount_state & MINIX_VALID_FS))
<------><------><------>return 0;
<------><------>/* Mounting a rw partition read-only. */
<------><------>if (sbi->s_version != MINIX_V3)
<------><------><------>ms->s_state = sbi->s_mount_state;
<------><------>mark_buffer_dirty(sbi->s_sbh);
<------>} else {
<------>  	/* Mount a partition which is read-only, read-write. */
<------><------>if (sbi->s_version != MINIX_V3) {
<------><------><------>sbi->s_mount_state = ms->s_state;
<------><------><------>ms->s_state &= ~MINIX_VALID_FS;
<------><------>} else {
<------><------><------>sbi->s_mount_state = MINIX_VALID_FS;
<------><------>}
<------><------>mark_buffer_dirty(sbi->s_sbh);
 
<------><------>if (!(sbi->s_mount_state & MINIX_VALID_FS))
<------><------><------>printk("MINIX-fs warning: remounting unchecked fs, "
<------><------><------><------>"running fsck is recommended\n");
<------><------>else if ((sbi->s_mount_state & MINIX_ERROR_FS))
<------><------><------>printk("MINIX-fs warning: remounting fs with errors, "
<------><------><------><------>"running fsck is recommended\n");
<------>}
<------>return 0;
}
 
static bool minix_check_superblock(struct super_block *sb)
{
<------>struct minix_sb_info *sbi = minix_sb(sb);
 
<------>if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
<------><------>return false;
 
<------>/*
<------> * s_max_size must not exceed the block mapping limitation.  This check
<------> * is only needed for V1 filesystems, since V2/V3 support an extra level
<------> * of indirect blocks which places the limit well above U32_MAX.
<------> */
<------>if (sbi->s_version == MINIX_V1 &&
<------>    sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE)
<------><------>return false;
 
<------>return true;
}
 
static int minix_fill_super(struct super_block *s, void *data, int silent)
{
<------>struct buffer_head *bh;
<------>struct buffer_head **map;
<------>struct minix_super_block *ms;
<------>struct minix3_super_block *m3s = NULL;
<------>unsigned long i, block;
<------>struct inode *root_inode;
<------>struct minix_sb_info *sbi;
<------>int ret = -EINVAL;
 
<------>sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
<------>if (!sbi)
<------><------>return -ENOMEM;
<------>s->s_fs_info = sbi;
 
<------>BUILD_BUG_ON(32 != sizeof (struct minix_inode));
<------>BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
 
<------>if (!sb_set_blocksize(s, BLOCK_SIZE))
<------><------>goto out_bad_hblock;
 
<------>if (!(bh = sb_bread(s, 1)))
<------><------>goto out_bad_sb;
 
<------>ms = (struct minix_super_block *) bh->b_data;
<------>sbi->s_ms = ms;
<------>sbi->s_sbh = bh;
<------>sbi->s_mount_state = ms->s_state;
<------>sbi->s_ninodes = ms->s_ninodes;
<------>sbi->s_nzones = ms->s_nzones;
<------>sbi->s_imap_blocks = ms->s_imap_blocks;
<------>sbi->s_zmap_blocks = ms->s_zmap_blocks;
<------>sbi->s_firstdatazone = ms->s_firstdatazone;
<------>sbi->s_log_zone_size = ms->s_log_zone_size;
<------>s->s_maxbytes = ms->s_max_size;
<------>s->s_magic = ms->s_magic;
<------>if (s->s_magic == MINIX_SUPER_MAGIC) {
<------><------>sbi->s_version = MINIX_V1;
<------><------>sbi->s_dirsize = 16;
<------><------>sbi->s_namelen = 14;
<------><------>s->s_max_links = MINIX_LINK_MAX;
<------>} else if (s->s_magic == MINIX_SUPER_MAGIC2) {
<------><------>sbi->s_version = MINIX_V1;
<------><------>sbi->s_dirsize = 32;
<------><------>sbi->s_namelen = 30;
<------><------>s->s_max_links = MINIX_LINK_MAX;
<------>} else if (s->s_magic == MINIX2_SUPER_MAGIC) {
<------><------>sbi->s_version = MINIX_V2;
<------><------>sbi->s_nzones = ms->s_zones;
<------><------>sbi->s_dirsize = 16;
<------><------>sbi->s_namelen = 14;
<------><------>s->s_max_links = MINIX2_LINK_MAX;
<------>} else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
<------><------>sbi->s_version = MINIX_V2;
<------><------>sbi->s_nzones = ms->s_zones;
<------><------>sbi->s_dirsize = 32;
<------><------>sbi->s_namelen = 30;
<------><------>s->s_max_links = MINIX2_LINK_MAX;
<------>} else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
<------><------>m3s = (struct minix3_super_block *) bh->b_data;
<------><------>s->s_magic = m3s->s_magic;
<------><------>sbi->s_imap_blocks = m3s->s_imap_blocks;
<------><------>sbi->s_zmap_blocks = m3s->s_zmap_blocks;
<------><------>sbi->s_firstdatazone = m3s->s_firstdatazone;
<------><------>sbi->s_log_zone_size = m3s->s_log_zone_size;
<------><------>s->s_maxbytes = m3s->s_max_size;
<------><------>sbi->s_ninodes = m3s->s_ninodes;
<------><------>sbi->s_nzones = m3s->s_zones;
<------><------>sbi->s_dirsize = 64;
<------><------>sbi->s_namelen = 60;
<------><------>sbi->s_version = MINIX_V3;
<------><------>sbi->s_mount_state = MINIX_VALID_FS;
<------><------>sb_set_blocksize(s, m3s->s_blocksize);
<------><------>s->s_max_links = MINIX2_LINK_MAX;
<------>} else
<------><------>goto out_no_fs;
 
<------>if (!minix_check_superblock(s))
<------><------>goto out_illegal_sb;
 
<------>/*
<------> * Allocate the buffer map to keep the superblock small.
<------> */
<------>i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
<------>map = kzalloc(i, GFP_KERNEL);
<------>if (!map)
<------><------>goto out_no_map;
<------>sbi->s_imap = &map[0];
<------>sbi->s_zmap = &map[sbi->s_imap_blocks];
 
<------>block=2;
<------>for (i=0 ; i < sbi->s_imap_blocks ; i++) {
<------><------>if (!(sbi->s_imap[i]=sb_bread(s, block)))
<------><------><------>goto out_no_bitmap;
<------><------>block++;
<------>}
<------>for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
<------><------>if (!(sbi->s_zmap[i]=sb_bread(s, block)))
<------><------><------>goto out_no_bitmap;
<------><------>block++;
<------>}
 
<------>minix_set_bit(0,sbi->s_imap[0]->b_data);
<------>minix_set_bit(0,sbi->s_zmap[0]->b_data);
 
<------>/* Apparently minix can create filesystems that allocate more blocks for
<------> * the bitmaps than needed.  We simply ignore that, but verify it didn't
<------> * create one with not enough blocks and bail out if so.
<------> */
<------>block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
<------>if (sbi->s_imap_blocks < block) {
<------><------>printk("MINIX-fs: file system does not have enough "
<------><------><------><------>"imap blocks allocated.  Refusing to mount.\n");
<------><------>goto out_no_bitmap;
<------>}
 
<------>block = minix_blocks_needed(
<------><------><------>(sbi->s_nzones - sbi->s_firstdatazone + 1),
<------><------><------>s->s_blocksize);
<------>if (sbi->s_zmap_blocks < block) {
<------><------>printk("MINIX-fs: file system does not have enough "
<------><------><------><------>"zmap blocks allocated.  Refusing to mount.\n");
<------><------>goto out_no_bitmap;
<------>}
 
<------>/* set up enough so that it can read an inode */
<------>s->s_op = &minix_sops;
<------>s->s_time_min = 0;
<------>s->s_time_max = U32_MAX;
<------>root_inode = minix_iget(s, MINIX_ROOT_INO);
<------>if (IS_ERR(root_inode)) {
<------><------>ret = PTR_ERR(root_inode);
<------><------>goto out_no_root;
<------>}
 
<------>ret = -ENOMEM;
<------>s->s_root = d_make_root(root_inode);
<------>if (!s->s_root)
<------><------>goto out_no_root;
 
<------>if (!sb_rdonly(s)) {
<------><------>if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
<------><------><------>ms->s_state &= ~MINIX_VALID_FS;
<------><------>mark_buffer_dirty(bh);
<------>}
<------>if (!(sbi->s_mount_state & MINIX_VALID_FS))
<------><------>printk("MINIX-fs: mounting unchecked file system, "
<------><------><------>"running fsck is recommended\n");
<------>else if (sbi->s_mount_state & MINIX_ERROR_FS)
<------><------>printk("MINIX-fs: mounting file system with errors, "
<------><------><------>"running fsck is recommended\n");
 
<------>return 0;
 
out_no_root:
<------>if (!silent)
<------><------>printk("MINIX-fs: get root inode failed\n");
<------>goto out_freemap;
 
out_no_bitmap:
<------>printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
out_freemap:
<------>for (i = 0; i < sbi->s_imap_blocks; i++)
<------><------>brelse(sbi->s_imap[i]);
<------>for (i = 0; i < sbi->s_zmap_blocks; i++)
<------><------>brelse(sbi->s_zmap[i]);
<------>kfree(sbi->s_imap);
<------>goto out_release;
 
out_no_map:
<------>ret = -ENOMEM;
<------>if (!silent)
<------><------>printk("MINIX-fs: can't allocate map\n");
<------>goto out_release;
 
out_illegal_sb:
<------>if (!silent)
<------><------>printk("MINIX-fs: bad superblock\n");
<------>goto out_release;
 
out_no_fs:
<------>if (!silent)
<------><------>printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
<------><------>       "on device %s.\n", s->s_id);
out_release:
<------>brelse(bh);
<------>goto out;
 
out_bad_hblock:
<------>printk("MINIX-fs: blocksize too small for device\n");
<------>goto out;
 
out_bad_sb:
<------>printk("MINIX-fs: unable to read superblock\n");
out:
<------>s->s_fs_info = NULL;
<------>kfree(sbi);
<------>return ret;
}
 
static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
{
<------>struct super_block *sb = dentry->d_sb;
<------>struct minix_sb_info *sbi = minix_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_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
<------>buf->f_bfree = minix_count_free_blocks(sb);
<------>buf->f_bavail = buf->f_bfree;
<------>buf->f_files = sbi->s_ninodes;
<------>buf->f_ffree = minix_count_free_inodes(sb);
<------>buf->f_namelen = sbi->s_namelen;
<------>buf->f_fsid = u64_to_fsid(id);
 
<------>return 0;
}
 
static int minix_get_block(struct inode *inode, sector_t block,
<------><------>    struct buffer_head *bh_result, int create)
{
<------>if (INODE_VERSION(inode) == MINIX_V1)
<------><------>return V1_minix_get_block(inode, block, bh_result, create);
<------>else
<------><------>return V2_minix_get_block(inode, block, bh_result, create);
}
 
static int minix_writepage(struct page *page, struct writeback_control *wbc)
{
<------>return block_write_full_page(page, minix_get_block, wbc);
}
 
static int minix_readpage(struct file *file, struct page *page)
{
<------>return block_read_full_page(page,minix_get_block);
}
 
int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
{
<------>return __block_write_begin(page, pos, len, minix_get_block);
}
 
static void minix_write_failed(struct address_space *mapping, loff_t to)
{
<------>struct inode *inode = mapping->host;
 
<------>if (to > inode->i_size) {
<------><------>truncate_pagecache(inode, inode->i_size);
<------><------>minix_truncate(inode);
<------>}
}
 
static int minix_write_begin(struct file *file, struct address_space *mapping,
<------><------><------>loff_t pos, unsigned len, unsigned flags,
<------><------><------>struct page **pagep, void **fsdata)
{
<------>int ret;
 
<------>ret = block_write_begin(mapping, pos, len, flags, pagep,
<------><------><------><------>minix_get_block);
<------>if (unlikely(ret))
<------><------>minix_write_failed(mapping, pos + len);
 
<------>return ret;
}
 
static sector_t minix_bmap(struct address_space *mapping, sector_t block)
{
<------>return generic_block_bmap(mapping,block,minix_get_block);
}
 
static const struct address_space_operations minix_aops = {
<------>.readpage = minix_readpage,
<------>.writepage = minix_writepage,
<------>.write_begin = minix_write_begin,
<------>.write_end = generic_write_end,
<------>.bmap = minix_bmap
};
 
static const struct inode_operations minix_symlink_inode_operations = {
<------>.get_link	= page_get_link,
<------>.getattr	= minix_getattr,
};
 
void minix_set_inode(struct inode *inode, dev_t rdev)
{
<------>if (S_ISREG(inode->i_mode)) {
<------><------>inode->i_op = &minix_file_inode_operations;
<------><------>inode->i_fop = &minix_file_operations;
<------><------>inode->i_mapping->a_ops = &minix_aops;
<------>} else if (S_ISDIR(inode->i_mode)) {
<------><------>inode->i_op = &minix_dir_inode_operations;
<------><------>inode->i_fop = &minix_dir_operations;
<------><------>inode->i_mapping->a_ops = &minix_aops;
<------>} else if (S_ISLNK(inode->i_mode)) {
<------><------>inode->i_op = &minix_symlink_inode_operations;
<------><------>inode_nohighmem(inode);
<------><------>inode->i_mapping->a_ops = &minix_aops;
<------>} else
<------><------>init_special_inode(inode, inode->i_mode, rdev);
}
 
/*
 * The minix V1 function to read an inode.
 */
static struct inode *V1_minix_iget(struct inode *inode)
{
<------>struct buffer_head * bh;
<------>struct minix_inode * raw_inode;
<------>struct minix_inode_info *minix_inode = minix_i(inode);
<------>int i;
 
<------>raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
<------>if (!raw_inode) {
<------><------>iget_failed(inode);
<------><------>return ERR_PTR(-EIO);
<------>}
<------>if (raw_inode->i_nlinks == 0) {
<------><------>printk("MINIX-fs: deleted inode referenced: %lu\n",
<------><------>       inode->i_ino);
<------><------>brelse(bh);
<------><------>iget_failed(inode);
<------><------>return ERR_PTR(-ESTALE);
<------>}
<------>inode->i_mode = raw_inode->i_mode;
<------>i_uid_write(inode, raw_inode->i_uid);
<------>i_gid_write(inode, raw_inode->i_gid);
<------>set_nlink(inode, raw_inode->i_nlinks);
<------>inode->i_size = raw_inode->i_size;
<------>inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
<------>inode->i_mtime.tv_nsec = 0;
<------>inode->i_atime.tv_nsec = 0;
<------>inode->i_ctime.tv_nsec = 0;
<------>inode->i_blocks = 0;
<------>for (i = 0; i < 9; i++)
<------><------>minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
<------>minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
<------>brelse(bh);
<------>unlock_new_inode(inode);
<------>return inode;
}
 
/*
 * The minix V2 function to read an inode.
 */
static struct inode *V2_minix_iget(struct inode *inode)
{
<------>struct buffer_head * bh;
<------>struct minix2_inode * raw_inode;
<------>struct minix_inode_info *minix_inode = minix_i(inode);
<------>int i;
 
<------>raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
<------>if (!raw_inode) {
<------><------>iget_failed(inode);
<------><------>return ERR_PTR(-EIO);
<------>}
<------>if (raw_inode->i_nlinks == 0) {
<------><------>printk("MINIX-fs: deleted inode referenced: %lu\n",
<------><------>       inode->i_ino);
<------><------>brelse(bh);
<------><------>iget_failed(inode);
<------><------>return ERR_PTR(-ESTALE);
<------>}
<------>inode->i_mode = raw_inode->i_mode;
<------>i_uid_write(inode, raw_inode->i_uid);
<------>i_gid_write(inode, raw_inode->i_gid);
<------>set_nlink(inode, raw_inode->i_nlinks);
<------>inode->i_size = raw_inode->i_size;
<------>inode->i_mtime.tv_sec = raw_inode->i_mtime;
<------>inode->i_atime.tv_sec = raw_inode->i_atime;
<------>inode->i_ctime.tv_sec = raw_inode->i_ctime;
<------>inode->i_mtime.tv_nsec = 0;
<------>inode->i_atime.tv_nsec = 0;
<------>inode->i_ctime.tv_nsec = 0;
<------>inode->i_blocks = 0;
<------>for (i = 0; i < 10; i++)
<------><------>minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
<------>minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
<------>brelse(bh);
<------>unlock_new_inode(inode);
<------>return inode;
}
 
/*
 * The global function to read an inode.
 */
struct inode *minix_iget(struct super_block *sb, unsigned long ino)
{
<------>struct inode *inode;
 
<------>inode = iget_locked(sb, ino);
<------>if (!inode)
<------><------>return ERR_PTR(-ENOMEM);
<------>if (!(inode->i_state & I_NEW))
<------><------>return inode;
 
<------>if (INODE_VERSION(inode) == MINIX_V1)
<------><------>return V1_minix_iget(inode);
<------>else
<------><------>return V2_minix_iget(inode);
}
 
/*
 * The minix V1 function to synchronize an inode.
 */
static struct buffer_head * V1_minix_update_inode(struct inode * inode)
{
<------>struct buffer_head * bh;
<------>struct minix_inode * raw_inode;
<------>struct minix_inode_info *minix_inode = minix_i(inode);
<------>int i;
 
<------>raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
<------>if (!raw_inode)
<------><------>return NULL;
<------>raw_inode->i_mode = inode->i_mode;
<------>raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
<------>raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
<------>raw_inode->i_nlinks = inode->i_nlink;
<------>raw_inode->i_size = inode->i_size;
<------>raw_inode->i_time = inode->i_mtime.tv_sec;
<------>if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
<------><------>raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
<------>else for (i = 0; i < 9; i++)
<------><------>raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
<------>mark_buffer_dirty(bh);
<------>return bh;
}
 
/*
 * The minix V2 function to synchronize an inode.
 */
static struct buffer_head * V2_minix_update_inode(struct inode * inode)
{
<------>struct buffer_head * bh;
<------>struct minix2_inode * raw_inode;
<------>struct minix_inode_info *minix_inode = minix_i(inode);
<------>int i;
 
<------>raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
<------>if (!raw_inode)
<------><------>return NULL;
<------>raw_inode->i_mode = inode->i_mode;
<------>raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
<------>raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
<------>raw_inode->i_nlinks = inode->i_nlink;
<------>raw_inode->i_size = inode->i_size;
<------>raw_inode->i_mtime = inode->i_mtime.tv_sec;
<------>raw_inode->i_atime = inode->i_atime.tv_sec;
<------>raw_inode->i_ctime = inode->i_ctime.tv_sec;
<------>if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
<------><------>raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
<------>else for (i = 0; i < 10; i++)
<------><------>raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
<------>mark_buffer_dirty(bh);
<------>return bh;
}
 
static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
{
<------>int err = 0;
<------>struct buffer_head *bh;
 
<------>if (INODE_VERSION(inode) == MINIX_V1)
<------><------>bh = V1_minix_update_inode(inode);
<------>else
<------><------>bh = V2_minix_update_inode(inode);
<------>if (!bh)
<------><------>return -EIO;
<------>if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
<------><------>sync_dirty_buffer(bh);
<------><------>if (buffer_req(bh) && !buffer_uptodate(bh)) {
<------><------><------>printk("IO error syncing minix inode [%s:%08lx]\n",
<------><------><------><------>inode->i_sb->s_id, inode->i_ino);
<------><------><------>err = -EIO;
<------><------>}
<------>}
<------>brelse (bh);
<------>return err;
}
 
int minix_getattr(const struct path *path, struct kstat *stat,
<------><------>  u32 request_mask, unsigned int flags)
{
<------>struct super_block *sb = path->dentry->d_sb;
<------>struct inode *inode = d_inode(path->dentry);
 
<------>generic_fillattr(inode, stat);
<------>if (INODE_VERSION(inode) == MINIX_V1)
<------><------>stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
<------>else
<------><------>stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
<------>stat->blksize = sb->s_blocksize;
<------>return 0;
}
 
/*
 * The function that is called for file truncation.
 */
void minix_truncate(struct inode * inode)
{
<------>if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
<------><------>return;
<------>if (INODE_VERSION(inode) == MINIX_V1)
<------><------>V1_minix_truncate(inode);
<------>else
<------><------>V2_minix_truncate(inode);
}
 
static struct dentry *minix_mount(struct file_system_type *fs_type,
<------>int flags, const char *dev_name, void *data)
{
<------>return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
}
 
static struct file_system_type minix_fs_type = {
<------>.owner		= THIS_MODULE,
<------>.name		= "minix",
<------>.mount		= minix_mount,
<------>.kill_sb	= kill_block_super,
<------>.fs_flags	= FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("minix");
 
static int __init init_minix_fs(void)
{
<------>int err = init_inodecache();
<------>if (err)
<------><------>goto out1;
<------>err = register_filesystem(&minix_fs_type);
<------>if (err)
<------><------>goto out;
<------>return 0;
out:
<------>destroy_inodecache();
out1:
<------>return err;
}
 
static void __exit exit_minix_fs(void)
{
        unregister_filesystem(&minix_fs_type);
<------>destroy_inodecache();
}
 
module_init(init_minix_fs)
module_exit(exit_minix_fs)
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);