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681 lines
17 KiB
681 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/fs/affs/inode.c |
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* |
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* (c) 1996 Hans-Joachim Widmaier - Rewritten |
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* |
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* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. |
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* |
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* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. |
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* |
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* (C) 1991 Linus Torvalds - minix filesystem |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/statfs.h> |
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#include <linux/parser.h> |
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#include <linux/magic.h> |
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#include <linux/sched.h> |
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#include <linux/cred.h> |
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#include <linux/slab.h> |
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#include <linux/writeback.h> |
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#include <linux/blkdev.h> |
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#include <linux/seq_file.h> |
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#include <linux/iversion.h> |
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#include "affs.h" |
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|
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static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
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static int affs_show_options(struct seq_file *m, struct dentry *root); |
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static int affs_remount (struct super_block *sb, int *flags, char *data); |
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|
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static void |
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affs_commit_super(struct super_block *sb, int wait) |
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{ |
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struct affs_sb_info *sbi = AFFS_SB(sb); |
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struct buffer_head *bh = sbi->s_root_bh; |
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struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh); |
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|
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lock_buffer(bh); |
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affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change); |
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affs_fix_checksum(sb, bh); |
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unlock_buffer(bh); |
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mark_buffer_dirty(bh); |
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if (wait) |
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sync_dirty_buffer(bh); |
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} |
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|
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static void |
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affs_put_super(struct super_block *sb) |
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{ |
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struct affs_sb_info *sbi = AFFS_SB(sb); |
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pr_debug("%s()\n", __func__); |
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|
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cancel_delayed_work_sync(&sbi->sb_work); |
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} |
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static int |
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affs_sync_fs(struct super_block *sb, int wait) |
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{ |
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affs_commit_super(sb, wait); |
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return 0; |
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} |
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static void flush_superblock(struct work_struct *work) |
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{ |
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struct affs_sb_info *sbi; |
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struct super_block *sb; |
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sbi = container_of(work, struct affs_sb_info, sb_work.work); |
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sb = sbi->sb; |
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spin_lock(&sbi->work_lock); |
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sbi->work_queued = 0; |
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spin_unlock(&sbi->work_lock); |
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affs_commit_super(sb, 1); |
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} |
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void affs_mark_sb_dirty(struct super_block *sb) |
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{ |
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struct affs_sb_info *sbi = AFFS_SB(sb); |
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unsigned long delay; |
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if (sb_rdonly(sb)) |
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return; |
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spin_lock(&sbi->work_lock); |
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if (!sbi->work_queued) { |
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delay = msecs_to_jiffies(dirty_writeback_interval * 10); |
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queue_delayed_work(system_long_wq, &sbi->sb_work, delay); |
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sbi->work_queued = 1; |
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} |
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spin_unlock(&sbi->work_lock); |
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} |
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static struct kmem_cache * affs_inode_cachep; |
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static struct inode *affs_alloc_inode(struct super_block *sb) |
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{ |
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struct affs_inode_info *i; |
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i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); |
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if (!i) |
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return NULL; |
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inode_set_iversion(&i->vfs_inode, 1); |
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i->i_lc = NULL; |
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i->i_ext_bh = NULL; |
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i->i_pa_cnt = 0; |
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return &i->vfs_inode; |
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} |
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static void affs_free_inode(struct inode *inode) |
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{ |
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kmem_cache_free(affs_inode_cachep, AFFS_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 affs_inode_info *ei = (struct affs_inode_info *) foo; |
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mutex_init(&ei->i_link_lock); |
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mutex_init(&ei->i_ext_lock); |
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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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affs_inode_cachep = kmem_cache_create("affs_inode_cache", |
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sizeof(struct affs_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 (affs_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(affs_inode_cachep); |
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} |
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static const struct super_operations affs_sops = { |
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.alloc_inode = affs_alloc_inode, |
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.free_inode = affs_free_inode, |
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.write_inode = affs_write_inode, |
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.evict_inode = affs_evict_inode, |
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.put_super = affs_put_super, |
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.sync_fs = affs_sync_fs, |
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.statfs = affs_statfs, |
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.remount_fs = affs_remount, |
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.show_options = affs_show_options, |
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}; |
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enum { |
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Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect, |
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Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
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Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
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}; |
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static const match_table_t tokens = { |
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{Opt_bs, "bs=%u"}, |
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{Opt_mode, "mode=%o"}, |
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{Opt_mufs, "mufs"}, |
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{Opt_notruncate, "nofilenametruncate"}, |
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{Opt_prefix, "prefix=%s"}, |
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{Opt_protect, "protect"}, |
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{Opt_reserved, "reserved=%u"}, |
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{Opt_root, "root=%u"}, |
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{Opt_setgid, "setgid=%u"}, |
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{Opt_setuid, "setuid=%u"}, |
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{Opt_verbose, "verbose"}, |
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{Opt_volume, "volume=%s"}, |
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{Opt_ignore, "grpquota"}, |
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{Opt_ignore, "noquota"}, |
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{Opt_ignore, "quota"}, |
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{Opt_ignore, "usrquota"}, |
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{Opt_err, NULL}, |
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}; |
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static int |
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parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root, |
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int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) |
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{ |
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char *p; |
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substring_t args[MAX_OPT_ARGS]; |
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|
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/* Fill in defaults */ |
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*uid = current_uid(); |
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*gid = current_gid(); |
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*reserved = 2; |
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*root = -1; |
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*blocksize = -1; |
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volume[0] = ':'; |
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volume[1] = 0; |
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*mount_opts = 0; |
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if (!options) |
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return 1; |
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while ((p = strsep(&options, ",")) != NULL) { |
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int token, n, option; |
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if (!*p) |
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continue; |
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token = match_token(p, tokens, args); |
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switch (token) { |
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case Opt_bs: |
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if (match_int(&args[0], &n)) |
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return 0; |
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if (n != 512 && n != 1024 && n != 2048 |
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&& n != 4096) { |
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pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); |
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return 0; |
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} |
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*blocksize = n; |
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break; |
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case Opt_mode: |
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if (match_octal(&args[0], &option)) |
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return 0; |
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*mode = option & 0777; |
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affs_set_opt(*mount_opts, SF_SETMODE); |
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break; |
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case Opt_mufs: |
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affs_set_opt(*mount_opts, SF_MUFS); |
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break; |
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case Opt_notruncate: |
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affs_set_opt(*mount_opts, SF_NO_TRUNCATE); |
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break; |
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case Opt_prefix: |
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kfree(*prefix); |
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*prefix = match_strdup(&args[0]); |
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if (!*prefix) |
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return 0; |
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affs_set_opt(*mount_opts, SF_PREFIX); |
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break; |
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case Opt_protect: |
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affs_set_opt(*mount_opts, SF_IMMUTABLE); |
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break; |
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case Opt_reserved: |
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if (match_int(&args[0], reserved)) |
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return 0; |
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break; |
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case Opt_root: |
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if (match_int(&args[0], root)) |
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return 0; |
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break; |
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case Opt_setgid: |
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if (match_int(&args[0], &option)) |
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return 0; |
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*gid = make_kgid(current_user_ns(), option); |
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if (!gid_valid(*gid)) |
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return 0; |
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affs_set_opt(*mount_opts, SF_SETGID); |
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break; |
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case Opt_setuid: |
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if (match_int(&args[0], &option)) |
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return 0; |
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*uid = make_kuid(current_user_ns(), option); |
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if (!uid_valid(*uid)) |
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return 0; |
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affs_set_opt(*mount_opts, SF_SETUID); |
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break; |
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case Opt_verbose: |
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affs_set_opt(*mount_opts, SF_VERBOSE); |
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break; |
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case Opt_volume: { |
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char *vol = match_strdup(&args[0]); |
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if (!vol) |
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return 0; |
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strlcpy(volume, vol, 32); |
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kfree(vol); |
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break; |
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} |
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case Opt_ignore: |
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/* Silently ignore the quota options */ |
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break; |
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default: |
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pr_warn("Unrecognized mount option \"%s\" or missing value\n", |
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p); |
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return 0; |
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} |
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} |
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return 1; |
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} |
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static int affs_show_options(struct seq_file *m, struct dentry *root) |
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{ |
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struct super_block *sb = root->d_sb; |
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struct affs_sb_info *sbi = AFFS_SB(sb); |
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if (sb->s_blocksize) |
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seq_printf(m, ",bs=%lu", sb->s_blocksize); |
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if (affs_test_opt(sbi->s_flags, SF_SETMODE)) |
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seq_printf(m, ",mode=%o", sbi->s_mode); |
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if (affs_test_opt(sbi->s_flags, SF_MUFS)) |
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seq_puts(m, ",mufs"); |
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if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE)) |
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seq_puts(m, ",nofilenametruncate"); |
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if (affs_test_opt(sbi->s_flags, SF_PREFIX)) |
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seq_printf(m, ",prefix=%s", sbi->s_prefix); |
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if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE)) |
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seq_puts(m, ",protect"); |
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if (sbi->s_reserved != 2) |
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seq_printf(m, ",reserved=%u", sbi->s_reserved); |
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if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2) |
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seq_printf(m, ",root=%u", sbi->s_root_block); |
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if (affs_test_opt(sbi->s_flags, SF_SETGID)) |
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seq_printf(m, ",setgid=%u", |
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from_kgid_munged(&init_user_ns, sbi->s_gid)); |
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if (affs_test_opt(sbi->s_flags, SF_SETUID)) |
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seq_printf(m, ",setuid=%u", |
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from_kuid_munged(&init_user_ns, sbi->s_uid)); |
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if (affs_test_opt(sbi->s_flags, SF_VERBOSE)) |
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seq_puts(m, ",verbose"); |
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if (sbi->s_volume[0]) |
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seq_printf(m, ",volume=%s", sbi->s_volume); |
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return 0; |
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} |
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|
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/* This function definitely needs to be split up. Some fine day I'll |
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* hopefully have the guts to do so. Until then: sorry for the mess. |
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*/ |
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static int affs_fill_super(struct super_block *sb, void *data, int silent) |
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{ |
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struct affs_sb_info *sbi; |
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struct buffer_head *root_bh = NULL; |
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struct buffer_head *boot_bh; |
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struct inode *root_inode = NULL; |
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s32 root_block; |
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int size, blocksize; |
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u32 chksum; |
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int num_bm; |
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int i, j; |
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kuid_t uid; |
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kgid_t gid; |
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int reserved; |
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unsigned long mount_flags; |
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int tmp_flags; /* fix remount prototype... */ |
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u8 sig[4]; |
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int ret; |
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pr_debug("read_super(%s)\n", data ? (const char *)data : "no options"); |
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sb->s_magic = AFFS_SUPER_MAGIC; |
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sb->s_op = &affs_sops; |
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sb->s_flags |= SB_NODIRATIME; |
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sb->s_time_gran = NSEC_PER_SEC; |
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sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA; |
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sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min; |
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sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
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if (!sbi) |
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return -ENOMEM; |
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sb->s_fs_info = sbi; |
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sbi->sb = sb; |
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mutex_init(&sbi->s_bmlock); |
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spin_lock_init(&sbi->symlink_lock); |
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spin_lock_init(&sbi->work_lock); |
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INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock); |
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if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, |
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&blocksize,&sbi->s_prefix, |
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sbi->s_volume, &mount_flags)) { |
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pr_err("Error parsing options\n"); |
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return -EINVAL; |
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} |
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/* N.B. after this point s_prefix must be released */ |
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sbi->s_flags = mount_flags; |
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sbi->s_mode = i; |
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sbi->s_uid = uid; |
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sbi->s_gid = gid; |
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sbi->s_reserved= reserved; |
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|
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/* Get the size of the device in 512-byte blocks. |
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* If we later see that the partition uses bigger |
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* blocks, we will have to change it. |
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*/ |
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size = i_size_read(sb->s_bdev->bd_inode) >> 9; |
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pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size); |
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affs_set_blocksize(sb, PAGE_SIZE); |
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/* Try to find root block. Its location depends on the block size. */ |
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i = bdev_logical_block_size(sb->s_bdev); |
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j = PAGE_SIZE; |
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if (blocksize > 0) { |
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i = j = blocksize; |
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size = size / (blocksize / 512); |
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} |
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for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) { |
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sbi->s_root_block = root_block; |
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if (root_block < 0) |
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sbi->s_root_block = (reserved + size - 1) / 2; |
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pr_debug("setting blocksize to %d\n", blocksize); |
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affs_set_blocksize(sb, blocksize); |
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sbi->s_partition_size = size; |
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/* The root block location that was calculated above is not |
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* correct if the partition size is an odd number of 512- |
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* byte blocks, which will be rounded down to a number of |
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* 1024-byte blocks, and if there were an even number of |
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* reserved blocks. Ideally, all partition checkers should |
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* report the real number of blocks of the real blocksize, |
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* but since this just cannot be done, we have to try to |
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* find the root block anyways. In the above case, it is one |
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* block behind the calculated one. So we check this one, too. |
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*/ |
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for (num_bm = 0; num_bm < 2; num_bm++) { |
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pr_debug("Dev %s, trying root=%u, bs=%d, " |
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"size=%d, reserved=%d\n", |
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sb->s_id, |
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sbi->s_root_block + num_bm, |
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blocksize, size, reserved); |
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root_bh = affs_bread(sb, sbi->s_root_block + num_bm); |
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if (!root_bh) |
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continue; |
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if (!affs_checksum_block(sb, root_bh) && |
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be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && |
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be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { |
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sbi->s_hashsize = blocksize / 4 - 56; |
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sbi->s_root_block += num_bm; |
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goto got_root; |
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} |
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affs_brelse(root_bh); |
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root_bh = NULL; |
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} |
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} |
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if (!silent) |
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pr_err("No valid root block on device %s\n", sb->s_id); |
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return -EINVAL; |
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|
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/* N.B. after this point bh must be released */ |
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got_root: |
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/* Keep super block in cache */ |
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sbi->s_root_bh = root_bh; |
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root_block = sbi->s_root_block; |
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|
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/* Find out which kind of FS we have */ |
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boot_bh = sb_bread(sb, 0); |
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if (!boot_bh) { |
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pr_err("Cannot read boot block\n"); |
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return -EINVAL; |
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} |
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memcpy(sig, boot_bh->b_data, 4); |
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brelse(boot_bh); |
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chksum = be32_to_cpu(*(__be32 *)sig); |
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|
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/* Dircache filesystems are compatible with non-dircache ones |
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* when reading. As long as they aren't supported, writing is |
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* not recommended. |
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*/ |
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if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS |
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|| chksum == MUFS_DCOFS) && !sb_rdonly(sb)) { |
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pr_notice("Dircache FS - mounting %s read only\n", sb->s_id); |
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sb->s_flags |= SB_RDONLY; |
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} |
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switch (chksum) { |
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case MUFS_FS: |
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case MUFS_INTLFFS: |
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case MUFS_DCFFS: |
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affs_set_opt(sbi->s_flags, SF_MUFS); |
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fallthrough; |
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case FS_INTLFFS: |
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case FS_DCFFS: |
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affs_set_opt(sbi->s_flags, SF_INTL); |
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break; |
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case MUFS_FFS: |
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affs_set_opt(sbi->s_flags, SF_MUFS); |
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break; |
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case FS_FFS: |
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break; |
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case MUFS_OFS: |
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affs_set_opt(sbi->s_flags, SF_MUFS); |
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fallthrough; |
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case FS_OFS: |
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affs_set_opt(sbi->s_flags, SF_OFS); |
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sb->s_flags |= SB_NOEXEC; |
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break; |
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case MUFS_DCOFS: |
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case MUFS_INTLOFS: |
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affs_set_opt(sbi->s_flags, SF_MUFS); |
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fallthrough; |
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case FS_DCOFS: |
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case FS_INTLOFS: |
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affs_set_opt(sbi->s_flags, SF_INTL); |
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affs_set_opt(sbi->s_flags, SF_OFS); |
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sb->s_flags |= SB_NOEXEC; |
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break; |
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default: |
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pr_err("Unknown filesystem on device %s: %08X\n", |
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sb->s_id, chksum); |
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return -EINVAL; |
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} |
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|
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if (affs_test_opt(mount_flags, SF_VERBOSE)) { |
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u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
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pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", |
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len > 31 ? 31 : len, |
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AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
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sig, sig[3] + '0', blocksize); |
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} |
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|
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sb->s_flags |= SB_NODEV | SB_NOSUID; |
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|
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sbi->s_data_blksize = sb->s_blocksize; |
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if (affs_test_opt(sbi->s_flags, SF_OFS)) |
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sbi->s_data_blksize -= 24; |
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|
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tmp_flags = sb->s_flags; |
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ret = affs_init_bitmap(sb, &tmp_flags); |
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if (ret) |
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return ret; |
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sb->s_flags = tmp_flags; |
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|
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/* set up enough so that it can read an inode */ |
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|
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root_inode = affs_iget(sb, root_block); |
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if (IS_ERR(root_inode)) |
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return PTR_ERR(root_inode); |
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|
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if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL)) |
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sb->s_d_op = &affs_intl_dentry_operations; |
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else |
|
sb->s_d_op = &affs_dentry_operations; |
|
|
|
sb->s_root = d_make_root(root_inode); |
|
if (!sb->s_root) { |
|
pr_err("AFFS: Get root inode failed\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
sb->s_export_op = &affs_export_ops; |
|
pr_debug("s_flags=%lX\n", sb->s_flags); |
|
return 0; |
|
} |
|
|
|
static int |
|
affs_remount(struct super_block *sb, int *flags, char *data) |
|
{ |
|
struct affs_sb_info *sbi = AFFS_SB(sb); |
|
int blocksize; |
|
kuid_t uid; |
|
kgid_t gid; |
|
int mode; |
|
int reserved; |
|
int root_block; |
|
unsigned long mount_flags; |
|
int res = 0; |
|
char volume[32]; |
|
char *prefix = NULL; |
|
|
|
pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data); |
|
|
|
sync_filesystem(sb); |
|
*flags |= SB_NODIRATIME; |
|
|
|
memcpy(volume, sbi->s_volume, 32); |
|
if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
|
&blocksize, &prefix, volume, |
|
&mount_flags)) { |
|
kfree(prefix); |
|
return -EINVAL; |
|
} |
|
|
|
flush_delayed_work(&sbi->sb_work); |
|
|
|
sbi->s_flags = mount_flags; |
|
sbi->s_mode = mode; |
|
sbi->s_uid = uid; |
|
sbi->s_gid = gid; |
|
/* protect against readers */ |
|
spin_lock(&sbi->symlink_lock); |
|
if (prefix) { |
|
kfree(sbi->s_prefix); |
|
sbi->s_prefix = prefix; |
|
} |
|
memcpy(sbi->s_volume, volume, 32); |
|
spin_unlock(&sbi->symlink_lock); |
|
|
|
if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
|
return 0; |
|
|
|
if (*flags & SB_RDONLY) |
|
affs_free_bitmap(sb); |
|
else |
|
res = affs_init_bitmap(sb, flags); |
|
|
|
return res; |
|
} |
|
|
|
static int |
|
affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
|
{ |
|
struct super_block *sb = dentry->d_sb; |
|
int free; |
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
|
|
|
pr_debug("%s() partsize=%d, reserved=%d\n", |
|
__func__, AFFS_SB(sb)->s_partition_size, |
|
AFFS_SB(sb)->s_reserved); |
|
|
|
free = affs_count_free_blocks(sb); |
|
buf->f_type = AFFS_SUPER_MAGIC; |
|
buf->f_bsize = sb->s_blocksize; |
|
buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
|
buf->f_bfree = free; |
|
buf->f_bavail = free; |
|
buf->f_fsid = u64_to_fsid(id); |
|
buf->f_namelen = AFFSNAMEMAX; |
|
return 0; |
|
} |
|
|
|
static struct dentry *affs_mount(struct file_system_type *fs_type, |
|
int flags, const char *dev_name, void *data) |
|
{ |
|
return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
|
} |
|
|
|
static void affs_kill_sb(struct super_block *sb) |
|
{ |
|
struct affs_sb_info *sbi = AFFS_SB(sb); |
|
kill_block_super(sb); |
|
if (sbi) { |
|
affs_free_bitmap(sb); |
|
affs_brelse(sbi->s_root_bh); |
|
kfree(sbi->s_prefix); |
|
mutex_destroy(&sbi->s_bmlock); |
|
kfree(sbi); |
|
} |
|
} |
|
|
|
static struct file_system_type affs_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "affs", |
|
.mount = affs_mount, |
|
.kill_sb = affs_kill_sb, |
|
.fs_flags = FS_REQUIRES_DEV, |
|
}; |
|
MODULE_ALIAS_FS("affs"); |
|
|
|
static int __init init_affs_fs(void) |
|
{ |
|
int err = init_inodecache(); |
|
if (err) |
|
goto out1; |
|
err = register_filesystem(&affs_fs_type); |
|
if (err) |
|
goto out; |
|
return 0; |
|
out: |
|
destroy_inodecache(); |
|
out1: |
|
return err; |
|
} |
|
|
|
static void __exit exit_affs_fs(void) |
|
{ |
|
unregister_filesystem(&affs_fs_type); |
|
destroy_inodecache(); |
|
} |
|
|
|
MODULE_DESCRIPTION("Amiga filesystem support for Linux"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
module_init(init_affs_fs) |
|
module_exit(exit_affs_fs)
|
|
|