602 lines
16 KiB
C
602 lines
16 KiB
C
/*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl)
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* Minix V2 fs support.
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*
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* Modified for 680x0 by Andreas Schwab
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*/
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#include <linux/module.h>
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#include "minix.h"
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#include <linux/buffer_head.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/highuid.h>
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#include <linux/vfs.h>
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static void minix_read_inode(struct inode * inode);
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static int minix_write_inode(struct inode * inode, int wait);
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static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int minix_remount (struct super_block * sb, int * flags, char * data);
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static void minix_delete_inode(struct inode *inode)
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{
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truncate_inode_pages(&inode->i_data, 0);
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inode->i_size = 0;
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minix_truncate(inode);
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minix_free_inode(inode);
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}
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static void minix_put_super(struct super_block *sb)
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{
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int i;
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struct minix_sb_info *sbi = minix_sb(sb);
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if (!(sb->s_flags & MS_RDONLY)) {
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sbi->s_ms->s_state = sbi->s_mount_state;
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mark_buffer_dirty(sbi->s_sbh);
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}
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for (i = 0; i < sbi->s_imap_blocks; i++)
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brelse(sbi->s_imap[i]);
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for (i = 0; i < sbi->s_zmap_blocks; i++)
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brelse(sbi->s_zmap[i]);
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brelse (sbi->s_sbh);
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kfree(sbi->s_imap);
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sb->s_fs_info = NULL;
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kfree(sbi);
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return;
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}
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static kmem_cache_t * minix_inode_cachep;
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static struct inode *minix_alloc_inode(struct super_block *sb)
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{
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struct minix_inode_info *ei;
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ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, SLAB_KERNEL);
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if (!ei)
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return NULL;
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return &ei->vfs_inode;
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}
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static void minix_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(minix_inode_cachep, minix_i(inode));
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}
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static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
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{
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struct minix_inode_info *ei = (struct minix_inode_info *) foo;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR)
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inode_init_once(&ei->vfs_inode);
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}
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static int init_inodecache(void)
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{
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minix_inode_cachep = kmem_cache_create("minix_inode_cache",
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sizeof(struct minix_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD),
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init_once, NULL);
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if (minix_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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kmem_cache_destroy(minix_inode_cachep);
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}
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static struct super_operations minix_sops = {
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.alloc_inode = minix_alloc_inode,
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.destroy_inode = minix_destroy_inode,
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.read_inode = minix_read_inode,
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.write_inode = minix_write_inode,
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.delete_inode = minix_delete_inode,
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.put_super = minix_put_super,
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.statfs = minix_statfs,
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.remount_fs = minix_remount,
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};
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static int minix_remount (struct super_block * sb, int * flags, char * data)
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{
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struct minix_sb_info * sbi = minix_sb(sb);
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struct minix_super_block * ms;
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ms = sbi->s_ms;
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if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
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return 0;
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if (*flags & MS_RDONLY) {
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if (ms->s_state & MINIX_VALID_FS ||
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!(sbi->s_mount_state & MINIX_VALID_FS))
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return 0;
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/* Mounting a rw partition read-only. */
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ms->s_state = sbi->s_mount_state;
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mark_buffer_dirty(sbi->s_sbh);
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} else {
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/* Mount a partition which is read-only, read-write. */
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sbi->s_mount_state = ms->s_state;
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ms->s_state &= ~MINIX_VALID_FS;
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mark_buffer_dirty(sbi->s_sbh);
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if (!(sbi->s_mount_state & MINIX_VALID_FS))
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printk("MINIX-fs warning: remounting unchecked fs, "
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"running fsck is recommended\n");
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else if ((sbi->s_mount_state & MINIX_ERROR_FS))
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printk("MINIX-fs warning: remounting fs with errors, "
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"running fsck is recommended\n");
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}
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return 0;
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}
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static int minix_fill_super(struct super_block *s, void *data, int silent)
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{
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struct buffer_head *bh;
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struct buffer_head **map;
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struct minix_super_block *ms;
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int i, block;
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struct inode *root_inode;
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struct minix_sb_info *sbi;
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sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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s->s_fs_info = sbi;
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BUILD_BUG_ON(32 != sizeof (struct minix_inode));
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BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
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if (!sb_set_blocksize(s, BLOCK_SIZE))
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goto out_bad_hblock;
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if (!(bh = sb_bread(s, 1)))
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goto out_bad_sb;
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ms = (struct minix_super_block *) bh->b_data;
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sbi->s_ms = ms;
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sbi->s_sbh = bh;
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sbi->s_mount_state = ms->s_state;
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sbi->s_ninodes = ms->s_ninodes;
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sbi->s_nzones = ms->s_nzones;
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sbi->s_imap_blocks = ms->s_imap_blocks;
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sbi->s_zmap_blocks = ms->s_zmap_blocks;
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sbi->s_firstdatazone = ms->s_firstdatazone;
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sbi->s_log_zone_size = ms->s_log_zone_size;
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sbi->s_max_size = ms->s_max_size;
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s->s_magic = ms->s_magic;
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if (s->s_magic == MINIX_SUPER_MAGIC) {
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sbi->s_version = MINIX_V1;
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sbi->s_dirsize = 16;
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sbi->s_namelen = 14;
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sbi->s_link_max = MINIX_LINK_MAX;
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} else if (s->s_magic == MINIX_SUPER_MAGIC2) {
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sbi->s_version = MINIX_V1;
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sbi->s_dirsize = 32;
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sbi->s_namelen = 30;
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sbi->s_link_max = MINIX_LINK_MAX;
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} else if (s->s_magic == MINIX2_SUPER_MAGIC) {
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sbi->s_version = MINIX_V2;
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sbi->s_nzones = ms->s_zones;
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sbi->s_dirsize = 16;
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sbi->s_namelen = 14;
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sbi->s_link_max = MINIX2_LINK_MAX;
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} else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
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sbi->s_version = MINIX_V2;
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sbi->s_nzones = ms->s_zones;
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sbi->s_dirsize = 32;
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sbi->s_namelen = 30;
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sbi->s_link_max = MINIX2_LINK_MAX;
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} else
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goto out_no_fs;
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/*
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* Allocate the buffer map to keep the superblock small.
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*/
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if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
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goto out_illegal_sb;
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i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
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map = kzalloc(i, GFP_KERNEL);
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if (!map)
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goto out_no_map;
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sbi->s_imap = &map[0];
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sbi->s_zmap = &map[sbi->s_imap_blocks];
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block=2;
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for (i=0 ; i < sbi->s_imap_blocks ; i++) {
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if (!(sbi->s_imap[i]=sb_bread(s, block)))
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goto out_no_bitmap;
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block++;
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}
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for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
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if (!(sbi->s_zmap[i]=sb_bread(s, block)))
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goto out_no_bitmap;
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block++;
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}
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minix_set_bit(0,sbi->s_imap[0]->b_data);
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minix_set_bit(0,sbi->s_zmap[0]->b_data);
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/* set up enough so that it can read an inode */
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s->s_op = &minix_sops;
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root_inode = iget(s, MINIX_ROOT_INO);
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if (!root_inode || is_bad_inode(root_inode))
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goto out_no_root;
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s->s_root = d_alloc_root(root_inode);
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if (!s->s_root)
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goto out_iput;
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if (!NO_TRUNCATE)
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s->s_root->d_op = &minix_dentry_operations;
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if (!(s->s_flags & MS_RDONLY)) {
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ms->s_state &= ~MINIX_VALID_FS;
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mark_buffer_dirty(bh);
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}
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if (!(sbi->s_mount_state & MINIX_VALID_FS))
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printk("MINIX-fs: mounting unchecked file system, "
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"running fsck is recommended\n");
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else if (sbi->s_mount_state & MINIX_ERROR_FS)
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printk("MINIX-fs: mounting file system with errors, "
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"running fsck is recommended\n");
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return 0;
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out_iput:
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iput(root_inode);
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goto out_freemap;
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out_no_root:
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if (!silent)
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printk("MINIX-fs: get root inode failed\n");
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goto out_freemap;
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out_no_bitmap:
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printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
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out_freemap:
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for (i = 0; i < sbi->s_imap_blocks; i++)
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brelse(sbi->s_imap[i]);
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for (i = 0; i < sbi->s_zmap_blocks; i++)
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brelse(sbi->s_zmap[i]);
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kfree(sbi->s_imap);
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goto out_release;
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out_no_map:
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if (!silent)
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printk("MINIX-fs: can't allocate map\n");
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goto out_release;
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out_illegal_sb:
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if (!silent)
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printk("MINIX-fs: bad superblock\n");
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goto out_release;
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out_no_fs:
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if (!silent)
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printk("VFS: Can't find a Minix or Minix V2 filesystem "
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"on device %s\n", s->s_id);
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out_release:
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brelse(bh);
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goto out;
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out_bad_hblock:
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printk("MINIX-fs: blocksize too small for device\n");
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goto out;
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out_bad_sb:
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printk("MINIX-fs: unable to read superblock\n");
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out:
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s->s_fs_info = NULL;
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kfree(sbi);
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return -EINVAL;
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}
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static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
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buf->f_type = dentry->d_sb->s_magic;
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buf->f_bsize = dentry->d_sb->s_blocksize;
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buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
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buf->f_bfree = minix_count_free_blocks(sbi);
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buf->f_bavail = buf->f_bfree;
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buf->f_files = sbi->s_ninodes;
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buf->f_ffree = minix_count_free_inodes(sbi);
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buf->f_namelen = sbi->s_namelen;
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return 0;
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}
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static int minix_get_block(struct inode *inode, sector_t block,
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struct buffer_head *bh_result, int create)
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{
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if (INODE_VERSION(inode) == MINIX_V1)
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return V1_minix_get_block(inode, block, bh_result, create);
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else
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return V2_minix_get_block(inode, block, bh_result, create);
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}
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static int minix_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page, minix_get_block, wbc);
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}
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static int minix_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page,minix_get_block);
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}
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static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
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{
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return block_prepare_write(page,from,to,minix_get_block);
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}
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static sector_t minix_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping,block,minix_get_block);
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}
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static const struct address_space_operations minix_aops = {
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.readpage = minix_readpage,
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.writepage = minix_writepage,
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.sync_page = block_sync_page,
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.prepare_write = minix_prepare_write,
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.commit_write = generic_commit_write,
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.bmap = minix_bmap
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};
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static struct inode_operations minix_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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.getattr = minix_getattr,
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};
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void minix_set_inode(struct inode *inode, dev_t rdev)
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{
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if (S_ISREG(inode->i_mode)) {
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inode->i_op = &minix_file_inode_operations;
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inode->i_fop = &minix_file_operations;
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inode->i_mapping->a_ops = &minix_aops;
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op = &minix_dir_inode_operations;
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inode->i_fop = &minix_dir_operations;
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inode->i_mapping->a_ops = &minix_aops;
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} else if (S_ISLNK(inode->i_mode)) {
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inode->i_op = &minix_symlink_inode_operations;
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inode->i_mapping->a_ops = &minix_aops;
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} else
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init_special_inode(inode, inode->i_mode, rdev);
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}
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/*
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* The minix V1 function to read an inode.
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*/
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static void V1_minix_read_inode(struct inode * inode)
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{
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struct buffer_head * bh;
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struct minix_inode * raw_inode;
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struct minix_inode_info *minix_inode = minix_i(inode);
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int i;
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raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
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if (!raw_inode) {
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make_bad_inode(inode);
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return;
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}
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inode->i_mode = raw_inode->i_mode;
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inode->i_uid = (uid_t)raw_inode->i_uid;
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inode->i_gid = (gid_t)raw_inode->i_gid;
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inode->i_nlink = raw_inode->i_nlinks;
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inode->i_size = raw_inode->i_size;
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inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
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inode->i_mtime.tv_nsec = 0;
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inode->i_atime.tv_nsec = 0;
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inode->i_ctime.tv_nsec = 0;
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inode->i_blocks = 0;
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for (i = 0; i < 9; i++)
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minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
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minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
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brelse(bh);
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}
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/*
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* The minix V2 function to read an inode.
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*/
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static void V2_minix_read_inode(struct inode * inode)
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{
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struct buffer_head * bh;
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struct minix2_inode * raw_inode;
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struct minix_inode_info *minix_inode = minix_i(inode);
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int i;
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raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
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if (!raw_inode) {
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make_bad_inode(inode);
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return;
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}
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inode->i_mode = raw_inode->i_mode;
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inode->i_uid = (uid_t)raw_inode->i_uid;
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inode->i_gid = (gid_t)raw_inode->i_gid;
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inode->i_nlink = raw_inode->i_nlinks;
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inode->i_size = raw_inode->i_size;
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inode->i_mtime.tv_sec = raw_inode->i_mtime;
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inode->i_atime.tv_sec = raw_inode->i_atime;
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inode->i_ctime.tv_sec = raw_inode->i_ctime;
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inode->i_mtime.tv_nsec = 0;
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inode->i_atime.tv_nsec = 0;
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inode->i_ctime.tv_nsec = 0;
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inode->i_blocks = 0;
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for (i = 0; i < 10; i++)
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minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
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minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
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brelse(bh);
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}
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/*
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* The global function to read an inode.
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*/
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static void minix_read_inode(struct inode * inode)
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{
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if (INODE_VERSION(inode) == MINIX_V1)
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V1_minix_read_inode(inode);
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else
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V2_minix_read_inode(inode);
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}
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/*
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* The minix V1 function to synchronize an inode.
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*/
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static struct buffer_head * V1_minix_update_inode(struct inode * inode)
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{
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struct buffer_head * bh;
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struct minix_inode * raw_inode;
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struct minix_inode_info *minix_inode = minix_i(inode);
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int i;
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raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
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if (!raw_inode)
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return NULL;
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raw_inode->i_mode = inode->i_mode;
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|
raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
|
|
raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
|
|
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(inode->i_uid);
|
|
raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
|
|
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 struct buffer_head *minix_update_inode(struct inode *inode)
|
|
{
|
|
if (INODE_VERSION(inode) == MINIX_V1)
|
|
return V1_minix_update_inode(inode);
|
|
else
|
|
return V2_minix_update_inode(inode);
|
|
}
|
|
|
|
static int minix_write_inode(struct inode * inode, int wait)
|
|
{
|
|
brelse(minix_update_inode(inode));
|
|
return 0;
|
|
}
|
|
|
|
int minix_sync_inode(struct inode * inode)
|
|
{
|
|
int err = 0;
|
|
struct buffer_head *bh;
|
|
|
|
bh = minix_update_inode(inode);
|
|
if (bh && 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 = -1;
|
|
}
|
|
}
|
|
else if (!bh)
|
|
err = -1;
|
|
brelse (bh);
|
|
return err;
|
|
}
|
|
|
|
int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
|
|
{
|
|
generic_fillattr(dentry->d_inode, stat);
|
|
if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
|
|
stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size);
|
|
else
|
|
stat->blocks = (BLOCK_SIZE / 512) * V2_minix_blocks(stat->size);
|
|
stat->blksize = BLOCK_SIZE;
|
|
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 int minix_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
|
|
mnt);
|
|
}
|
|
|
|
static struct file_system_type minix_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "minix",
|
|
.get_sb = minix_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
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");
|
|
|