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![Christian Brauner](/assets/img/avatar_default.png)
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b
("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
724 lines
19 KiB
C
724 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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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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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 = alloc_inode_sb(sb, 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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{
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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, "
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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 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;
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/*
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* s_max_size must not exceed the block mapping limitation. This check
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* is only needed for V1 filesystems, since V2/V3 support an extra level
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* of indirect blocks which places the limit well above U32_MAX.
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*/
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if (sbi->s_version == MINIX_V1 &&
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sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE)
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return false;
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return true;
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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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struct minix3_super_block *m3s = NULL;
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unsigned long i, block;
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struct inode *root_inode;
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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;
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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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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;
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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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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;
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s->s_max_links = 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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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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*/
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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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/* 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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}
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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;
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|
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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);
|
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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_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;
|
|
|
|
out_no_map:
|
|
ret = -ENOMEM;
|
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if (!silent)
|
|
printk("MINIX-fs: can't allocate map\n");
|
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goto out_release;
|
|
|
|
out_illegal_sb:
|
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if (!silent)
|
|
printk("MINIX-fs: bad superblock\n");
|
|
goto out_release;
|
|
|
|
out_no_fs:
|
|
if (!silent)
|
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printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
|
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"on device %s.\n", s->s_id);
|
|
out_release:
|
|
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:
|
|
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)
|
|
{
|
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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);
|
|
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_read_folio(struct file *file, struct folio *folio)
|
|
{
|
|
return block_read_full_folio(folio, 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,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
int ret;
|
|
|
|
ret = block_write_begin(mapping, pos, len, 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 = {
|
|
.dirty_folio = block_dirty_folio,
|
|
.invalidate_folio = block_invalidate_folio,
|
|
.read_folio = minix_read_folio,
|
|
.writepage = minix_writepage,
|
|
.write_begin = minix_write_begin,
|
|
.write_end = generic_write_end,
|
|
.bmap = minix_bmap,
|
|
.direct_IO = noop_direct_IO
|
|
};
|
|
|
|
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 mnt_idmap *idmap, 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(&nop_mnt_idmap, 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");
|
|
|