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723 lines
19 KiB
723 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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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 |
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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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* Updated to filesystem version 3 by Daniel Aragones |
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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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#include <linux/writeback.h> |
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|
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static int minix_write_inode(struct inode *inode, |
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struct writeback_control *wbc); |
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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_evict_inode(struct inode *inode) |
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{ |
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truncate_inode_pages_final(&inode->i_data); |
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if (!inode->i_nlink) { |
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inode->i_size = 0; |
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minix_truncate(inode); |
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} |
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invalidate_inode_buffers(inode); |
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clear_inode(inode); |
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if (!inode->i_nlink) |
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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_rdonly(sb)) { |
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if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
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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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} |
|
|
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static struct kmem_cache * minix_inode_cachep; |
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|
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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 = kmem_cache_alloc(minix_inode_cachep, GFP_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_free_in_core_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) |
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{ |
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struct minix_inode_info *ei = (struct minix_inode_info *) foo; |
|
|
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inode_init_once(&ei->vfs_inode); |
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} |
|
|
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static int __init 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|SLAB_ACCOUNT), |
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init_once); |
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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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/* |
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* Make sure all delayed rcu free inodes are flushed before we |
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* destroy cache. |
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*/ |
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rcu_barrier(); |
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kmem_cache_destroy(minix_inode_cachep); |
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} |
|
|
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static const struct super_operations minix_sops = { |
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.alloc_inode = minix_alloc_inode, |
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.free_inode = minix_free_in_core_inode, |
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.write_inode = minix_write_inode, |
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.evict_inode = minix_evict_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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struct minix_sb_info * sbi = minix_sb(sb); |
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struct minix_super_block * ms; |
|
|
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sync_filesystem(sb); |
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ms = sbi->s_ms; |
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if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
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return 0; |
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if (*flags & SB_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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if (sbi->s_version != MINIX_V3) |
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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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if (sbi->s_version != MINIX_V3) { |
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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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} else { |
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sbi->s_mount_state = MINIX_VALID_FS; |
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} |
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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, " |
|
"running fsck is recommended\n"); |
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} |
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return 0; |
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} |
|
|
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static bool minix_check_superblock(struct super_block *sb) |
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{ |
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struct minix_sb_info *sbi = minix_sb(sb); |
|
|
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if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) |
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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. |
|
*/ |
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if (sbi->s_version == MINIX_V1 && |
|
sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
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static int minix_fill_super(struct super_block *s, void *data, int silent) |
|
{ |
|
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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struct minix3_super_block *m3s = NULL; |
|
unsigned long i, block; |
|
struct inode *root_inode; |
|
struct minix_sb_info *sbi; |
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int ret = -EINVAL; |
|
|
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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; |
|
|
|
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; |
|
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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s->s_maxbytes = 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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s->s_max_links = MINIX_LINK_MAX; |
|
} 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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s->s_max_links = 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; |
|
s->s_max_links = MINIX2_LINK_MAX; |
|
} else if (s->s_magic == MINIX2_SUPER_MAGIC2) { |
|
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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s->s_max_links = MINIX2_LINK_MAX; |
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} else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { |
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m3s = (struct minix3_super_block *) bh->b_data; |
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s->s_magic = m3s->s_magic; |
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sbi->s_imap_blocks = m3s->s_imap_blocks; |
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sbi->s_zmap_blocks = m3s->s_zmap_blocks; |
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sbi->s_firstdatazone = m3s->s_firstdatazone; |
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sbi->s_log_zone_size = m3s->s_log_zone_size; |
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s->s_maxbytes = m3s->s_max_size; |
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sbi->s_ninodes = m3s->s_ninodes; |
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sbi->s_nzones = m3s->s_zones; |
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sbi->s_dirsize = 64; |
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sbi->s_namelen = 60; |
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sbi->s_version = MINIX_V3; |
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sbi->s_mount_state = MINIX_VALID_FS; |
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sb_set_blocksize(s, m3s->s_blocksize); |
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s->s_max_links = MINIX2_LINK_MAX; |
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} else |
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goto out_no_fs; |
|
|
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if (!minix_check_superblock(s)) |
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goto out_illegal_sb; |
|
|
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/* |
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* Allocate the buffer map to keep the superblock small. |
|
*/ |
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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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|
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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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|
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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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|
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/* Apparently minix can create filesystems that allocate more blocks for |
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* the bitmaps than needed. We simply ignore that, but verify it didn't |
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* create one with not enough blocks and bail out if so. |
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*/ |
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block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); |
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if (sbi->s_imap_blocks < block) { |
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printk("MINIX-fs: file system does not have enough " |
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"imap blocks allocated. Refusing to mount.\n"); |
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goto out_no_bitmap; |
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} |
|
|
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block = minix_blocks_needed( |
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(sbi->s_nzones - sbi->s_firstdatazone + 1), |
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s->s_blocksize); |
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if (sbi->s_zmap_blocks < block) { |
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printk("MINIX-fs: file system does not have enough " |
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"zmap blocks allocated. Refusing to mount.\n"); |
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goto out_no_bitmap; |
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} |
|
|
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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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s->s_time_min = 0; |
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s->s_time_max = U32_MAX; |
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root_inode = minix_iget(s, MINIX_ROOT_INO); |
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if (IS_ERR(root_inode)) { |
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ret = PTR_ERR(root_inode); |
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goto out_no_root; |
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} |
|
|
|
ret = -ENOMEM; |
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s->s_root = d_make_root(root_inode); |
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if (!s->s_root) |
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goto out_no_root; |
|
|
|
if (!sb_rdonly(s)) { |
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if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
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ms->s_state &= ~MINIX_VALID_FS; |
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mark_buffer_dirty(bh); |
|
} |
|
if (!(sbi->s_mount_state & MINIX_VALID_FS)) |
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printk("MINIX-fs: mounting unchecked file system, " |
|
"running fsck is recommended\n"); |
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else if (sbi->s_mount_state & MINIX_ERROR_FS) |
|
printk("MINIX-fs: mounting file system with errors, " |
|
"running fsck is recommended\n"); |
|
|
|
return 0; |
|
|
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out_no_root: |
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if (!silent) |
|
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]); |
|
for (i = 0; i < sbi->s_zmap_blocks; i++) |
|
brelse(sbi->s_zmap[i]); |
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kfree(sbi->s_imap); |
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goto out_release; |
|
|
|
out_no_map: |
|
ret = -ENOMEM; |
|
if (!silent) |
|
printk("MINIX-fs: can't allocate map\n"); |
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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 " |
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"on device %s.\n", s->s_id); |
|
out_release: |
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brelse(bh); |
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goto out; |
|
|
|
out_bad_hblock: |
|
printk("MINIX-fs: blocksize too small for device\n"); |
|
goto out; |
|
|
|
out_bad_sb: |
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printk("MINIX-fs: unable to read superblock\n"); |
|
out: |
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s->s_fs_info = NULL; |
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kfree(sbi); |
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return ret; |
|
} |
|
|
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static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) |
|
{ |
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struct super_block *sb = dentry->d_sb; |
|
struct minix_sb_info *sbi = minix_sb(sb); |
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u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
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buf->f_type = sb->s_magic; |
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buf->f_bsize = 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(sb); |
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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(sb); |
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buf->f_namelen = sbi->s_namelen; |
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buf->f_fsid = u64_to_fsid(id); |
|
|
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return 0; |
|
} |
|
|
|
static int minix_get_block(struct inode *inode, sector_t block, |
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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); |
|
} |
|
|
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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 = { |
|
.set_page_dirty = __set_page_dirty_buffers, |
|
.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(struct user_namespace *mnt_userns, 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(&init_user_ns, 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"); |
|
|
|
|