/* * linux/fs/affs/inode.c * * (c) 1996 Hans-Joachim Widmaier - Rewritten * * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. * * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. * * (C) 1991 Linus Torvalds - minix filesystem */ #include <linux/module.h> #include <linux/init.h> #include <linux/statfs.h> #include <linux/parser.h> #include "affs.h" extern struct timezone sys_tz; static int affs_statfs(struct super_block *sb, struct kstatfs *buf); static int affs_remount (struct super_block *sb, int *flags, char *data); static void affs_put_super(struct super_block *sb) { struct affs_sb_info *sbi = AFFS_SB(sb); pr_debug("AFFS: put_super()\n"); if (!(sb->s_flags & MS_RDONLY)) { AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1); secs_to_datestamp(get_seconds(), &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); affs_fix_checksum(sb, sbi->s_root_bh); mark_buffer_dirty(sbi->s_root_bh); } kfree(sbi->s_prefix); affs_free_bitmap(sb); affs_brelse(sbi->s_root_bh); kfree(sbi); sb->s_fs_info = NULL; return; } static void affs_write_super(struct super_block *sb) { int clean = 2; struct affs_sb_info *sbi = AFFS_SB(sb); if (!(sb->s_flags & MS_RDONLY)) { // if (sbi->s_bitmap[i].bm_bh) { // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) { // clean = 0; AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean); secs_to_datestamp(get_seconds(), &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); affs_fix_checksum(sb, sbi->s_root_bh); mark_buffer_dirty(sbi->s_root_bh); sb->s_dirt = !clean; /* redo until bitmap synced */ } else sb->s_dirt = 0; pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean); } static kmem_cache_t * affs_inode_cachep; static struct inode *affs_alloc_inode(struct super_block *sb) { struct affs_inode_info *ei; ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL); if (!ei) return NULL; ei->vfs_inode.i_version = 1; return &ei->vfs_inode; } static void affs_destroy_inode(struct inode *inode) { kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); } static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) { struct affs_inode_info *ei = (struct affs_inode_info *) foo; if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) { init_MUTEX(&ei->i_link_lock); init_MUTEX(&ei->i_ext_lock); inode_init_once(&ei->vfs_inode); } } static int init_inodecache(void) { affs_inode_cachep = kmem_cache_create("affs_inode_cache", sizeof(struct affs_inode_info), 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, init_once, NULL); if (affs_inode_cachep == NULL) return -ENOMEM; return 0; } static void destroy_inodecache(void) { if (kmem_cache_destroy(affs_inode_cachep)) printk(KERN_INFO "affs_inode_cache: not all structures were freed\n"); } static struct super_operations affs_sops = { .alloc_inode = affs_alloc_inode, .destroy_inode = affs_destroy_inode, .read_inode = affs_read_inode, .write_inode = affs_write_inode, .put_inode = affs_put_inode, .delete_inode = affs_delete_inode, .clear_inode = affs_clear_inode, .put_super = affs_put_super, .write_super = affs_write_super, .statfs = affs_statfs, .remount_fs = affs_remount, }; enum { Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, Opt_verbose, Opt_volume, Opt_ignore, Opt_err, }; static match_table_t tokens = { {Opt_bs, "bs=%u"}, {Opt_mode, "mode=%o"}, {Opt_mufs, "mufs"}, {Opt_prefix, "prefix=%s"}, {Opt_protect, "protect"}, {Opt_reserved, "reserved=%u"}, {Opt_root, "root=%u"}, {Opt_setgid, "setgid=%u"}, {Opt_setuid, "setuid=%u"}, {Opt_verbose, "verbose"}, {Opt_volume, "volume=%s"}, {Opt_ignore, "grpquota"}, {Opt_ignore, "noquota"}, {Opt_ignore, "quota"}, {Opt_ignore, "usrquota"}, {Opt_err, NULL}, }; static int parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) { char *p; substring_t args[MAX_OPT_ARGS]; /* Fill in defaults */ *uid = current->uid; *gid = current->gid; *reserved = 2; *root = -1; *blocksize = -1; volume[0] = ':'; volume[1] = 0; *mount_opts = 0; if (!options) return 1; while ((p = strsep(&options, ",")) != NULL) { int token, n, option; if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case Opt_bs: if (match_int(&args[0], &n)) return -EINVAL; if (n != 512 && n != 1024 && n != 2048 && n != 4096) { printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); return 0; } *blocksize = n; break; case Opt_mode: if (match_octal(&args[0], &option)) return 1; *mode = option & 0777; *mount_opts |= SF_SETMODE; break; case Opt_mufs: *mount_opts |= SF_MUFS; break; case Opt_prefix: /* Free any previous prefix */ kfree(*prefix); *prefix = NULL; *prefix = match_strdup(&args[0]); if (!*prefix) return 0; *mount_opts |= SF_PREFIX; break; case Opt_protect: *mount_opts |= SF_IMMUTABLE; break; case Opt_reserved: if (match_int(&args[0], reserved)) return 1; break; case Opt_root: if (match_int(&args[0], root)) return 1; break; case Opt_setgid: if (match_int(&args[0], &option)) return 1; *gid = option; *mount_opts |= SF_SETGID; break; case Opt_setuid: if (match_int(&args[0], &option)) return -EINVAL; *uid = option; *mount_opts |= SF_SETUID; break; case Opt_verbose: *mount_opts |= SF_VERBOSE; break; case Opt_volume: { char *vol = match_strdup(&args[0]); strlcpy(volume, vol, 32); kfree(vol); break; } case Opt_ignore: /* Silently ignore the quota options */ break; default: printk("AFFS: Unrecognized mount option \"%s\" " "or missing value\n", p); return 0; } } return 1; } /* This function definitely needs to be split up. Some fine day I'll * hopefully have the guts to do so. Until then: sorry for the mess. */ static int affs_fill_super(struct super_block *sb, void *data, int silent) { struct affs_sb_info *sbi; struct buffer_head *root_bh = NULL; struct buffer_head *boot_bh; struct inode *root_inode = NULL; s32 root_block; int size, blocksize; u32 chksum; int num_bm; int i, j; s32 key; uid_t uid; gid_t gid; int reserved; unsigned long mount_flags; int tmp_flags; /* fix remount prototype... */ pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); sb->s_magic = AFFS_SUPER_MAGIC; sb->s_op = &affs_sops; sb->s_flags |= MS_NODIRATIME; sbi = kmalloc(sizeof(struct affs_sb_info), GFP_KERNEL); if (!sbi) return -ENOMEM; sb->s_fs_info = sbi; memset(sbi, 0, sizeof(*sbi)); init_MUTEX(&sbi->s_bmlock); if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, &blocksize,&sbi->s_prefix, sbi->s_volume, &mount_flags)) { printk(KERN_ERR "AFFS: Error parsing options\n"); return -EINVAL; } /* N.B. after this point s_prefix must be released */ sbi->s_flags = mount_flags; sbi->s_mode = i; sbi->s_uid = uid; sbi->s_gid = gid; sbi->s_reserved= reserved; /* Get the size of the device in 512-byte blocks. * If we later see that the partition uses bigger * blocks, we will have to change it. */ size = sb->s_bdev->bd_inode->i_size >> 9; pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); affs_set_blocksize(sb, PAGE_SIZE); /* Try to find root block. Its location depends on the block size. */ i = 512; j = 4096; if (blocksize > 0) { i = j = blocksize; size = size / (blocksize / 512); } for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { sbi->s_root_block = root_block; if (root_block < 0) sbi->s_root_block = (reserved + size - 1) / 2; pr_debug("AFFS: setting blocksize to %d\n", blocksize); affs_set_blocksize(sb, blocksize); sbi->s_partition_size = size; /* The root block location that was calculated above is not * correct if the partition size is an odd number of 512- * byte blocks, which will be rounded down to a number of * 1024-byte blocks, and if there were an even number of * reserved blocks. Ideally, all partition checkers should * report the real number of blocks of the real blocksize, * but since this just cannot be done, we have to try to * find the root block anyways. In the above case, it is one * block behind the calculated one. So we check this one, too. */ for (num_bm = 0; num_bm < 2; num_bm++) { pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " "size=%d, reserved=%d\n", sb->s_id, sbi->s_root_block + num_bm, blocksize, size, reserved); root_bh = affs_bread(sb, sbi->s_root_block + num_bm); if (!root_bh) continue; if (!affs_checksum_block(sb, root_bh) && be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { sbi->s_hashsize = blocksize / 4 - 56; sbi->s_root_block += num_bm; key = 1; goto got_root; } affs_brelse(root_bh); root_bh = NULL; } } if (!silent) printk(KERN_ERR "AFFS: No valid root block on device %s\n", sb->s_id); goto out_error; /* N.B. after this point bh must be released */ got_root: root_block = sbi->s_root_block; /* Find out which kind of FS we have */ boot_bh = sb_bread(sb, 0); if (!boot_bh) { printk(KERN_ERR "AFFS: Cannot read boot block\n"); goto out_error; } chksum = be32_to_cpu(*(__be32 *)boot_bh->b_data); brelse(boot_bh); /* Dircache filesystems are compatible with non-dircache ones * when reading. As long as they aren't supported, writing is * not recommended. */ if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", sb->s_id); sb->s_flags |= MS_RDONLY; } switch (chksum) { case MUFS_FS: case MUFS_INTLFFS: case MUFS_DCFFS: sbi->s_flags |= SF_MUFS; /* fall thru */ case FS_INTLFFS: case FS_DCFFS: sbi->s_flags |= SF_INTL; break; case MUFS_FFS: sbi->s_flags |= SF_MUFS; break; case FS_FFS: break; case MUFS_OFS: sbi->s_flags |= SF_MUFS; /* fall thru */ case FS_OFS: sbi->s_flags |= SF_OFS; sb->s_flags |= MS_NOEXEC; break; case MUFS_DCOFS: case MUFS_INTLOFS: sbi->s_flags |= SF_MUFS; case FS_DCOFS: case FS_INTLOFS: sbi->s_flags |= SF_INTL | SF_OFS; sb->s_flags |= MS_NOEXEC; break; default: printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", sb->s_id, chksum); goto out_error; } if (mount_flags & SF_VERBOSE) { chksum = cpu_to_be32(chksum); printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n", AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0], AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, (char *)&chksum,((char *)&chksum)[3] + '0',blocksize); } sb->s_flags |= MS_NODEV | MS_NOSUID; sbi->s_data_blksize = sb->s_blocksize; if (sbi->s_flags & SF_OFS) sbi->s_data_blksize -= 24; /* Keep super block in cache */ sbi->s_root_bh = root_bh; /* N.B. after this point s_root_bh must be released */ tmp_flags = sb->s_flags; if (affs_init_bitmap(sb, &tmp_flags)) goto out_error; sb->s_flags = tmp_flags; /* set up enough so that it can read an inode */ root_inode = iget(sb, root_block); sb->s_root = d_alloc_root(root_inode); if (!sb->s_root) { printk(KERN_ERR "AFFS: Get root inode failed\n"); goto out_error; } sb->s_root->d_op = &affs_dentry_operations; pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); return 0; /* * Begin the cascaded cleanup ... */ out_error: if (root_inode) iput(root_inode); kfree(sbi->s_bitmap); affs_brelse(root_bh); kfree(sbi->s_prefix); kfree(sbi); sb->s_fs_info = NULL; return -EINVAL; } static int affs_remount(struct super_block *sb, int *flags, char *data) { struct affs_sb_info *sbi = AFFS_SB(sb); int blocksize; uid_t uid; gid_t gid; int mode; int reserved; int root_block; unsigned long mount_flags; int res = 0; pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); *flags |= MS_NODIRATIME; if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block, &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags)) return -EINVAL; sbi->s_flags = mount_flags; sbi->s_mode = mode; sbi->s_uid = uid; sbi->s_gid = gid; if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) return 0; if (*flags & MS_RDONLY) { sb->s_dirt = 1; while (sb->s_dirt) affs_write_super(sb); affs_free_bitmap(sb); } else res = affs_init_bitmap(sb, flags); return res; } static int affs_statfs(struct super_block *sb, struct kstatfs *buf) { int free; pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",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; return 0; } static struct super_block *affs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super); } static struct file_system_type affs_fs_type = { .owner = THIS_MODULE, .name = "affs", .get_sb = affs_get_sb, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; 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)